阅读说明：本技术 智能动力生成模块 (Intelligent power generation module ) 是由 黄得炫 姜寒星 李炅勋 R·珀施尔 G·富卡 M·普雷乌斯 F·博登施泰纳 于 2019-03-20 设计创作，主要内容包括：本发明涉及智能动力生成模块,其包括：电动机,设置有马达壳体,在所述马达壳体的内部容纳有定子和转子；逆变器,设置有逆变器壳体,在所述逆变器壳体的内部容纳有电容器、IGBT以及母线；冷却水流路,形成在所述马达壳体的内部,供冷却水流动；第一油流路,在所述马达壳体的长度方向上的一端部沿圆周方向延伸,以使油流动；复数个第一喷射喷嘴,在所述第一油流路的圆周方向上隔开配置,使所述油向所述马达壳体的内侧空间喷射；喷油用壳体,安装于所述马达壳体的长度方向上的另一端部；第二油流路,在所述喷油用壳体的内部沿圆周方向形成,以供油流动；以及复数个第二喷射喷嘴,在所述第二油流路的圆周方向上隔开配置,使所述油向所述马达壳体的内侧空间喷射。(The invention relates to an intelligent power generation module, comprising: an electric motor provided with a motor case in which a stator and a rotor are housed; an inverter provided with an inverter case, and a capacitor, an IGBT, and a bus bar are housed inside the inverter case; a cooling water flow path formed inside the motor housing, through which cooling water flows; a first oil flow path extending in a circumferential direction at one end portion in a longitudinal direction of the motor housing to flow oil; a plurality of first injection nozzles that are arranged at intervals in a circumferential direction of the first oil flow path and inject the oil into a space inside the motor case; an oil injection housing attached to the other end portion of the motor housing in the longitudinal direction; a second oil flow path formed in the circumferential direction inside the oil injection housing so as to allow oil to flow; and a plurality of second injection nozzles that are arranged at intervals in a circumferential direction of the second oil flow path and inject the oil into a space inside the motor case.)

1. An intelligent power generation module, comprising:

an electric motor provided with a motor case in which a stator and a rotor are housed;

an inverter provided with an inverter case, and a capacitor, an IGBT, and a bus bar are housed inside the inverter case;

a cooling water flow path formed inside the motor housing, through which cooling water flows;

a first oil flow path extending in a circumferential direction at one end portion in a longitudinal direction of the motor housing to flow oil;

a plurality of first injection nozzles that are arranged at intervals in a circumferential direction of the first oil flow path and inject the oil into a space inside the motor case;

an oil injection housing attached to the other end portion of the motor housing in the longitudinal direction;

a second oil flow path formed in the circumferential direction inside the oil injection housing so as to allow oil to flow; and

and a plurality of second injection nozzles that are arranged at intervals in a circumferential direction of the second oil flow passage and inject the oil into a space inside the motor case.

2. The intelligent power generation module of claim 1,

the motor case has a double-walled structure including an outer wall and an inner wall spaced apart from each other in a radial direction, a first oil flow passage forming portion forming the first oil flow passage is provided between the outer wall and the inner wall,

the plurality of first spray nozzles extend in a radial direction over a full 360-degree interval in a circumferential direction.

3. The intelligent power generation module of claim 2,

the electric motor is characterized by further comprising a gear box which is provided with a gear box shell, gears are contained in the gear box shell, and the gear box enables the speed of the electric motor to be reduced.

4. The intelligent power generation module of claim 3,

the gear case housing is provided with a second oil flow passage forming portion that is disposed opposite to the first oil flow passage forming portion and that forms the first oil flow passage together with the first oil flow passage forming portion.

5. The intelligent power generation module of claim 1,

the housing for oil injection includes:

an oil manifold having a double-walled structure in which an outer wall and an inner wall are provided at a distance in a radial direction, and the second oil flow path is formed between the outer wall and the inner wall;

a power supply connection portion cover portion formed to protrude upward from an upper portion of the second oil manifold so as to surround a power supply connection portion for applying power to the stator coil; and

a sump cover portion formed to protrude downward from a lower portion of the second oil manifold to cover the sump portion temporarily storing the oil at the lower portion of the motor case.

6. The intelligent power generation module of claim 1,

the oil pump is installed in front of the motor housing, and delivers the oil temporarily stored in the lower portion of the motor housing to the plurality of first injection nozzles and the plurality of second injection nozzles.

7. The intelligent power generation module of claim 1,

the cooling system further comprises a heat exchanger which is arranged on one side surface of the motor shell and enables the cooling water and the oil to exchange heat.

8. The intelligent power generation module of claim 7, further comprising:

an oil distribution flow path extending in a longitudinal direction on an outer circumferential surface of the motor housing to pass through the heat exchanger in the longitudinal direction, and distributing oil to the first oil flow path and the second oil flow path, respectively; and

and an oil discharge port formed inside the heat exchanger so as to communicate with the oil distribution passage, and discharging the oil cooled by the heat exchanger to the oil distribution passage.

9. The intelligent power generation module of claim 1,

the motor housing and the inverter housing are formed integrally with each other, and the inverter housing extends from an outer peripheral portion upper end of the motor housing in a tangential direction.

10. The intelligent power generation module of claim 9,

the inverter case is open in an upward direction,

the inverter includes:

a cooling plate attached to cover an open upper portion of the inverter case, and having a cooling water channel forming groove formed in an upper surface thereof, through which the cooling water flows, to cool the capacitor, the IGBT, and the bus bar; and

and an inverter cover mounted to cover an upper surface of the cooling plate.

11. The intelligent power generation module of claim 10,

the capacitor, the IGBT and the bus bar are mounted on the bottom surface of the cooling plate in an inverted manner,

a power supply connection part for applying a three-phase power to the motor is mounted on an upper part of the stator coil,

the bus bar is disposed close to the power supply connection portion in the tangential direction, the capacitor is disposed away from the power supply connection portion in the tangential direction, and the IGBT is disposed between the capacitor and the bus bar.

12. The intelligent power generation module of claim 1,

the cooling water flow path includes:

a plurality of heat exchange compartments extending in a longitudinal direction of the motor housing and arranged to be spaced apart in a circumferential direction of the motor housing;

a plurality of partition walls disposed between the plurality of heat exchange compartments to partition the plurality of heat exchange compartments; and

and a plurality of communication holes formed in the plurality of partition walls to communicate the plurality of heat exchange compartments in a circumferential direction.

13. The intelligent power generation module of claim 12,

the stator includes a plurality of ear portions formed to protrude from an outer circumferential surface of a stator core toward a radial direction outside and accommodating bolts therein to fasten the stator and the motor case with the bolts, the motor case includes a plurality of ear accommodating portions formed to protrude from an outer circumferential surface of the motor case toward a radial direction outside to accommodate the ear portions, respectively,

the plurality of partition walls and the plurality of ear accommodating portions are alternately arranged with each other in a circumferential direction of the motor housing.

14. The intelligent power generation module of claim 13,

the communication holes are disposed at a front end of the partition wall or a rear end of the ear accommodating portion.

15. The intelligent power generation module of claim 7,

a cooling water flow inlet through which the cooling water flows into an inside of the inverter case is formed at an inverter cover mounted to cover the inverter case,

a cooling water discharge port is formed in the heat exchanger, and the cooling water having exchanged heat with the oil is discharged from the heat exchanger to the outside through the cooling water discharge port.

Technical Field

The invention relates to an intelligent power generation module with a motor cooling structure adopting an oil-water cooling composite mode.

Background

Recently, electric vehicles (including hybrid vehicles) using an electric motor as a driving source for running of the vehicle have been released as future-type vehicles because of their excellent fuel efficiency.

Generally, an IPGM (Intelligent Power Generation Module) is a device including a motor, an inverter, and a gear box.

The motor is provided with a rotor and a stator, and the rotor may be rotatably provided inside the stator.

The stator is provided with a stator coil wound around a stator core, and when a current is applied to the stator coil in order to rotate the rotor, heat is generated in the stator coil, and thus a technique for cooling the heat generated in the motor is being developed.

In the motor of the electric vehicle, cooling plays an important role in heat generated in the motor in terms of downsizing and improvement in efficiency of the motor.

Conventional motor cooling methods employ an indirect cooling method of indirectly cooling the motor by circulating cooling water inside the housing, and a direct cooling method of directly cooling the motor by spraying oil to the stator, the rotor, or the like.

The conventional IPGM cooling structure has a type 1(type1) that uses oil (oil) for cooling the motor and cooling water (water) for cooling the inverter, and a type 2(type2) that uses cooling water for cooling the motor and the inverter.

However, the above-described type1 and type2 each cool the motor and selectively apply one cooling fluid of oil and cooling water, but do not simultaneously apply both types of motor cooling structures.

On the other hand, the direct cooling method using oil has advantages of high cooling efficiency and good cooling performance as compared with the indirect cooling method using cooling water, and research and development on the direct cooling method have been actively conducted recently.

Patent document 1(US8,629,586B2) discloses a rotating electric machine provided with a cooling mechanism (cooling mechanism), in which two outlets (outlets) are formed in a cooling water supply pipe located above a stator, whereby oil can be supplied to the left and right of an end coil even when the motor is tilted.

However, in the structure of dropping oil (drop) from the upper portion of the stator as described in the conventional patent, in order to secure the cooling performance of the motor even when the motor is inclined to either side due to turning, climbing, acceleration, and deceleration of the vehicle, a structure capable of injecting oil throughout the entire section in the circumferential direction of the stator coil is required, and in order to inject oil throughout the entire section, a new design of the manifold structure is required.

In addition, depending on the injection position or injection angle of the oil outlet, a section that is not wetted by oil may be generated at the end turn (end turn) of the stator coil.

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made to solve the problems of the prior art, and an object of the present invention is to provide an intelligent power generation module having a structure for simultaneously cooling a motor using oil and cooling water.

Another object of the present invention is to provide an intelligent power generation module capable of removing a section of a stator coil that is not wetted by oil by injecting oil into the stator coil from the entire 360-degree section of the stator in the circumferential direction.

Means for solving the problems

In order to achieve the above object, the intelligent power generation module of the present invention may include: an electric motor provided with a motor case in which a stator and a rotor are housed; an inverter provided with an inverter case, and a capacitor, an IGBT, and a bus bar are housed inside the inverter case; a cooling water flow path formed inside the motor housing, through which cooling water flows; a first oil flow path extending in a circumferential direction at one end portion in a longitudinal direction of the motor housing to flow oil; a plurality of first injection nozzles that are arranged at intervals in a circumferential direction of the first oil flow path and inject the oil into a space inside the motor case; an oil injection housing attached to the other end portion of the motor housing in the longitudinal direction; a second oil flow path formed in the circumferential direction inside the oil injection housing so as to allow oil to flow; and a plurality of second injection nozzles that are arranged at intervals in a circumferential direction of the second oil flow path and inject the oil into a space inside the motor case.

According to an example of the present invention, the motor housing may have a double-walled structure including an outer wall and an inner wall spaced apart from each other in a radial direction, a first oil flow passage forming portion forming the first oil flow passage may be provided between the outer wall and the inner wall, and the plurality of first injection nozzles may extend in the radial direction over a 360-degree entire section in a circumferential direction.

According to an example of the present invention, the electric vehicle may further include a gear box provided with a gear box housing, gears being accommodated inside the gear box housing, and the gear box reducing the speed of the electric motor.

According to an example of the present invention, the gear case housing may be provided with a second oil flow passage forming portion which is disposed opposite to the first oil flow passage forming portion and which forms the first oil flow passage together with the first oil flow passage forming portion.

According to an example related to the present invention, the injection housing may include: an oil manifold having a double-walled structure in which an outer wall and an inner wall are provided at a distance in a radial direction, and the second oil flow path is formed between the outer wall and the inner wall; a power supply connection portion cover portion formed to protrude upward from an upper portion of the second oil manifold so as to surround a power supply connection portion for applying power to the stator coil; and a sump cover portion formed to protrude downward from a lower portion of the second oil manifold to cover the sump portion temporarily storing the oil at the lower portion of the motor case.

According to an example of the present invention, the oil pump may be installed in front of the motor housing, and may transfer the oil temporarily stored in the lower portion of the motor housing to the plurality of first injection nozzles and the plurality of second injection nozzles.

According to an example of the present invention, the cooling system may further include a heat exchanger provided on one side surface of the motor housing and configured to exchange heat between the cooling water and the oil.

According to an example related to the present invention, the apparatus further includes: an oil distribution flow path extending in a longitudinal direction on an outer circumferential surface of the motor housing to pass through the heat exchanger in the longitudinal direction, and distributing oil to the first oil flow path and the second oil flow path, respectively; and an oil discharge port formed inside the heat exchanger so as to communicate with the oil distribution passage, and discharging the oil cooled by the heat exchanger to the oil distribution passage.

According to an example related to the present invention, the motor case and the inverter case may be formed integrally with each other, and the inverter case may extend in a tangential direction from an upper end of an outer peripheral portion of the motor case.

According to an example related to the present invention, the inverter case may be opened upward, and the inverter may include: a cooling plate attached to cover an open upper portion of the inverter case, and having a cooling water channel forming groove formed in an upper surface thereof, through which the cooling water flows, to cool the capacitor, the IGBT, and the bus bar; and an inverter cover installed to cover an upper surface of the cooling plate.

According to an example of the present invention, the capacitor, the IGBT, and the bus bar may be mounted on a bottom surface of the cooling plate in a hanging manner, a power supply connection portion for applying a three-phase power supply to the motor may be mounted on an upper portion of a stator coil, the bus bar may be disposed close to the power supply connection portion in the tangential direction, the capacitor may be disposed apart from the power supply connection portion in the tangential direction, and the IGBT may be disposed between the capacitor and the bus bar.

According to an example related to the present invention, the cooling water flow path may include: a plurality of heat exchange compartments extending in a longitudinal direction of the motor housing and arranged to be spaced apart in a circumferential direction of the motor housing; a plurality of partition walls disposed between the plurality of heat exchange compartments to partition the plurality of heat exchange compartments; and a plurality of communication holes formed in the plurality of partition walls to communicate the plurality of heat exchange compartments in a circumferential direction.

According to an example related to the present invention, the stator may include a plurality of ear portions formed to protrude from an outer circumferential surface of the stator core toward a radial direction outer side and accommodating bolts therein to fasten the stator and the motor case with the bolts, the motor case may include a plurality of ear portion accommodating portions formed to protrude from an outer circumferential surface of the motor case toward the radial direction outer side to accommodate the ear portions, respectively, and the plurality of partition walls and the plurality of ear portion accommodating portions may be alternately arranged with each other along a circumferential direction of the motor case.

According to an example of the present invention, the plurality of communication holes may be disposed at a front end portion of the partition wall or a rear end portion of the ear accommodating portion.

According to an example of the present invention, a cooling water inlet may be formed in an inverter cover attached to cover the inverter case, the cooling water may flow into the inverter case through the cooling water inlet, a cooling water discharge port may be formed in the heat exchanger, and the cooling water having exchanged heat with the oil may be discharged from the heat exchanger to the outside through the cooling water discharge port.

ADVANTAGEOUS EFFECTS OF INVENTION

Next, the effect of the intelligent power generation module of the present invention will be described.

First, by providing a cooling water flow path extending in the axial direction through which cooling water flows and an oil flow path extending in the circumferential direction through which oil flows inside the motor case, and cooling the motor with the cooling water and the oil, the motor cooling performance and the motor output can be improved.

Second, the plurality of first injection nozzles are disposed in the first oil flow path so as to be spaced apart over 360 degrees in the circumferential direction, the first oil flow path is formed inside the rear end of the motor case in the longitudinal direction along the circumferential direction, the plurality of second injection nozzles are disposed in the second oil flow path so as to be spaced apart over 360 degrees in the circumferential direction, the second oil flow path is formed inside the oil injection case attached to the front end portion of the motor case in the longitudinal direction along the circumferential direction, and the heat radiation performance of the stator coil can be improved by directly injecting oil to the end turns of the stator coil over 360 degrees in the circumferential direction through the plurality of first injection nozzles and the plurality of second injection nozzles.

Further, by injecting the oil throughout the 360-degree interval, even when the vehicle of the electric vehicle turns, or is driven uphill or downhill, or is accelerated or decelerated, the cooling performance of the oil can be uniformly maintained in the circumferential direction of the stator coil, and thus it is possible to prevent the occurrence of a dead zone (dead zone) in which oil is not cooled by the oil that wets only a part of the interval of the stator coil due to the oil wetting in the conventional art.

Third, the cooling water flow path of the motor housing is formed as an axial flow path extending in the axial direction, so that the cooling water flow path can be manufactured by die casting, and the motor housing does not need to be formed by conventional gravity casting for forming a spiral flow path, thereby improving productivity.

Fourth, if necessary, a structure in which cooling is performed only with cooling water may be used in the motor without providing an oil cooling structure. For example, in the case of a low-cost product, it may be constituted only by a structure cooled by cooling water, without requiring an oil pump, a heat exchanger, and the like.

Fifth, by applying a structure of simultaneously cooling with oil and cooling water to a high-output motor, a high output (60% of the maximum output) with respect to the maximum output can be continuously maintained.

Sixth, cost can be saved and strength can be improved by mounting the inverter to constitute an integrated case with the motor.

Seventh, by forming the cooling water flow passage in a zigzag shape extending in the axial direction and in the circumferential direction, even when the stator is not press-fitted into the motor case, and the stator core is of an ear part type formed at four positions and is bolted to the motor case, the cooling water flow passage structure can be formed in which the cooling water circulates while avoiding the positions of the bolt holes.

Eighth, the capacitor, the IGBT, and the bus bar of the inverter are mounted to be compactly inverted on the bottom surface of the cooling plate, and the capacitor, the IGBT, and the bus bar are simultaneously cooled by the cooling water, whereby the cooling performance of the inverter can be improved. In addition, by inverting the electric components such as the capacitor of the inverter, the length of the bus connected to the three-phase ac power supply of the motor is reduced, and thus the amount of heat generated by the bus can be reduced, and the cooling efficiency can be improved.

Ninth, the cooling water indirectly cools the inverter case motor while moving along the internal flow path of the inverter case and the motor case, and then absorbs heat by exchanging heat with the oil in the heat exchanger, thereby being able to improve the heat radiation performance of the oil.

Tenth, since the OIL is injected through the plurality of injection nozzles formed in the entire 360-degree interval in the circumferential direction inside the motor housing, it is not necessary to add a guide ring for OIL dripping (OIL drop), so that the number of parts and the number of assembly processes can be reduced, and the cost can be saved.

Drawings

Fig. 1 is a perspective view of an IPGM (intelligent power generation module) of the present invention.

Fig. 2 is an exploded view of fig. 1.

Fig. 3 is a perspective view illustrating a state in which the IGBTs, the capacitors, and the bus bars are mounted inside the inverter after the inverter cover and the cooling plate are removed from fig. 1.

Fig. 4 is a perspective view illustrating a direction in which the stator and rotor assembly of fig. 2 is mounted to the motor housing and a direction in which the inverter internal parts are mounted to the inverter housing.

Fig. 5 is a conceptual view illustrating a moving path of the cooling water of fig. 1.

Fig. 6 is a conceptual diagram illustrating inflow and outflow paths of cooling water in the inverter case of fig. 5.

Fig. 7 is a sectional view illustrating a path of the cooling water of fig. 5 moving from the inverter case to the motor case.

Fig. 8 is a conceptual diagram illustrating a path along which the cooling water of fig. 5 moves in a zigzag manner along the cooling water flow path inside the motor case.

Fig. 9 is a development view of the cooling water flow path of fig. 8, which is a conceptual view showing a moving path of the cooling water.

Fig. 10 is a conceptual diagram illustrating a moving path of the oil of fig. 1.

Fig. 11 is a conceptual diagram showing a case where oil is injected through injection holes in the entire section in the circumferential direction of the motor housing of fig. 9 and an oil flow passage forming portion formed in the gear housing.

Fig. 12 is a conceptual diagram illustrating a path of oil injected in the entire section in the circumferential direction of the oil injection housing of fig. 2.

Fig. 13 is a conceptual view enlarging a portion XIII of fig. 4 and showing a path along which oil is branched from the heat exchanger to the inside of the motor case.

Detailed Description

Hereinafter, embodiments disclosed in the present specification will be described in detail with reference to the drawings, and the same or similar components will be given the same reference numerals regardless of the figure number, and redundant description thereof will be omitted. The suffixes "module" and "portion" for the constituent elements used in the following description are given or mixed only in consideration of the writing of the specification, and do not have meanings or actions distinguished from each other by themselves. In addition, when the embodiments disclosed in the present specification are explained, if it is determined that the detailed explanation of the related known art may obscure the gist of the embodiments disclosed in the present specification, the detailed explanation thereof will be omitted. It should be understood that the drawings are only for the purpose of facilitating understanding of the embodiments disclosed in the present specification, and the technical idea disclosed in the present specification is not limited by the drawings, but covers all modifications, equivalents, and alternatives included in the spirit and technical scope of the present invention.

The terms "first", "second", and the like, including ordinal numbers, may be used to describe various elements, but the elements are not limited by the terms. The terms are used only for the purpose of distinguishing one constituent element from other constituent elements.

If a component is referred to as being "connected" or "coupled" to another component, it is to be understood that the component may be directly connected or coupled to the other component, but other components may be present therebetween. Conversely, if a component is referred to as being "directly connected" or "directly coupled" to another component, it is understood that no other component exists therebetween.

Unless the context clearly dictates otherwise, expressions in the singular include expressions in the plural.

In the present application, the terms "including" or "having" are used only for specifying the presence of the features, numerals, steps, actions, constituent elements, components, or combinations thereof described in the specification, and are not intended to exclude the possibility of the presence or addition of one or more other features, numerals, steps, actions, constituent elements, components, or combinations thereof.

Fig. 1 is a perspective view of an IPGM (intelligent power generation module) of the present invention, fig. 2 is an exploded view of fig. 1, fig. 3 is a perspective view showing a state in which IGBTs 216, capacitors 215, and bus bars 217 are installed inside an inverter 21 after an inverter cover 212 and a cooling plate 214 are removed from fig. 1, and fig. 4 is a perspective view showing a direction in which an assembly of a stator 24 and a rotor 25 of fig. 2 is installed to a motor case 10 and a direction in which internal components of the inverter 21 are installed to an inverter case 210.

Fig. 5 is a conceptual view illustrating a moving path of the cooling water of fig. 1, fig. 6 is a conceptual view illustrating an inflow and outflow path of the cooling water in the inverter case 210 of fig. 5, fig. 7 is a cross-sectional view illustrating a path of the cooling water of fig. 5 moving from the inverter case 210 to the motor case 10, fig. 8 is a conceptual view illustrating a path of the cooling water of fig. 5 moving in a zigzag form along the cooling water flow path 11 inside the motor case 10, and fig. 9 is a developed view of the cooling water flow path 11 of fig. 8 developed in a plane and is a conceptual view illustrating a moving path of the cooling water.

The Intelligent Power Generation Module (IPGM) of the present invention includes a motor 1, an inverter 21, and a gear box 22.

The motor 1 includes a stator 24 and a rotor 25 and generates power.

The stator 24 and the rotor 25 are accommodated inside the motor case 10. The motor housing 10 may be cylindrical. An accommodation space for accommodating the stator 24 and the rotor 25 is formed inside the motor housing 10. A sump portion 16 may be formed at a bottom surface of the motor housing 10. The oil sump portion 16 communicates with the accommodating space of the motor housing 10, and can temporarily store oil.

The stator 24 may be composed of a stator core 240 and a stator coil 242. The stator coils 242 may be wound in slots arranged at intervals in the circumferential direction of the stator core 240. A part of the stator coil 242 may protrude from both ends of the stator core 240 in the length direction toward the axial direction. A portion of the stator coil 242 protruding from both ENDs of the stator core 240 may be referred to as an END TURN (END TURN).

The stator coil 242 may be constituted by a three-phase (U, W, V-phase) coil, and may be connected to a three-phase alternating current power supply. A connection ring including a bus bar 217 for connecting a power supply connection portion 243 for applying power to the three-phase coils of the stator coil 242 and a neutral line formed at an end of each of the three-phase coils may be mounted on the stator coil 242.

The power supply connection part 243 may be provided with a three-phase terminal 244. The power supply connection part 243 may be integrally formed with the connection ring.

The rotor 25 may be rotatably disposed inside the stator core 240 with an air gap from the inside of the stator core 240. The rotor 25 may be composed of a rotor core and permanent magnets (not shown). The rotation shaft 26 may be coupled to an inner side of the rotor core and may rotate together with the rotor core.

Both end portions of the rotating shaft 26 may be rotatably supported by bearings.

A Resolver (Resolver) may be provided on one side in the length direction of the rotation shaft 26.

The other side of the rotating shaft 26 may be connected with a driving shaft of the gear box 22.

The gearbox 22 may include a gearbox housing 220 and gears disposed inside the gearbox housing 220. The gears may be configured to reduce the number of revolutions generated in the rotating shaft 26 of the motor 1 and increase the torque. The gears may be formed by planetary gear sets. The planetary gear set may include a ring gear, a sun gear, a planet gear, and a planet carrier, etc.

The motor housing 10 may be formed in a cylindrical shape, and both sides of the motor housing 10 in the length direction may be formed to be open.

An oil-ejecting case 19 and a protective Cover (Shield Cover)20 may be fastened to an open end of the motor case 10.

The other end portion of the motor housing 10 may be configured to be covered by the gear housing 220. A plurality of fastening portions are formed at one end of the motor housing 10, and thus can be fastened to the gear housing 220.

The inverter 21 is configured to include a capacitor 215 and an IGBT (Insulated Gate Bipolar Transistor) 216, and drives the motor 1.

The inverter case 210 may be formed in a rectangular shape extending along the length direction of the motor case 10. A connection portion 211 extending from one side surface of the inverter case 210 may be provided to cover the uppermost portion of the motor case 10.

The connection portion 211 may be integrally formed at an upper portion of the circumferential surface of the motor housing 10. The inverter case 210 may extend in a tangential direction with respect to the circumferential surface of the motor case 10.

The motor case 10 and the inverter case 210 may be integrally formed, whereby the electric motor 1 and the inverter 21 may be integrated. When the inverter 21 and the motor are constituted by one housing, cost can be saved and strength can be improved.

The upper portion of the inverter case 210 is open, and the inverter cover 212 may be detachably coupled to the open-side upper portion of the inverter case 210.

A cooling plate 214 may be mounted on an upper portion of the inverter case 210. The cooling plate 214 may be formed corresponding to the shape of the inverter case 210. The inverter cover 212 is mounted on an upper portion of the cooling plate 214, and may be mounted to cover a part or the whole of the cooling plate 214.

Components of the inverter 21 such as the capacitor 215 and the IGBT216 can be accommodated inside the inverter case 210.

The capacitor 215, the IGBT216, and the plurality of bus bars 217 may be mounted inside the inverter case 210 in a state of being hung upside down on the bottom surface of the cooling plate 214.

According to this configuration, the heat generated in each of the capacitor 215, the IGBT216, and the plurality of bus bars 217 can be efficiently dissipated via the cooling plate 214 by the temperature difference between the upper end portions of the capacitor 215, the IGBT216, and the plurality of bus bars 217 and the cooling plate 214.

The capacitor 215, the IGBT216, and the plurality of bus bars 217 may be arranged in this order in the tangential direction, with being most distant from the uppermost end of the motor case 10. The three-phase terminals 244 of the power supply connection portion 243 of the electric motor 1 may be disposed at the uppermost end portion of the motor case 10.

The protective cover 20 may be configured to cover the three-phase connection terminals 244 of the power supply connection part 243.

A cooling water flow path may be formed inside the cooling plate 214. A cooling water flow path forming groove 2141 may be formed inside the cooling plate 214. The cooling water flow path forming groove 2141 may be formed in the entire area of the cooling plate 214, and may be formed to be shallow in depth.

In the cooling water channel forming groove 2141 having such a configuration, the capacitor 215 and the IGBT216 are in contact with a small amount of cooling water in a maximally large area, and cooling performance of the cooling water can be improved.

A heat sink surface may be formed on one side of the IGBT 216. The heat absorbing surface may be formed to be able to contact the cooling plate 214 or to directly contact the cooling water. In the present embodiment, an opening portion 2142 is formed in the bottom surface of the cooling plate 214 so that the IGBT216 and the cooling water can be in direct contact, and the cooling water and the heat absorbing surface can be in contact through the opening portion 2142. The opening portion 2142 and the heat absorbing surface may be formed in the same shape and size. In this case, the sealing member is disposed between the cooling plate 214 and the heat absorbing surface, and thereby the cooling water can be prevented from leaking from the cooling plate 214 to the space inside the inverter case 210.

According to this structure, the cooling water can directly absorb heat from the IGBT216 through the heat absorbing surface, and thus the cooling performance can be improved.

The plurality of bus bars 217 may be disposed close to the three-phase connection terminals 244 of the power supply connection portion 243 of the motor 1. One side of each of the plurality of bus bars 217 is connected to the capacitor 215 and the IGBT216, and the other side of each of the plurality of bus bars 217 is connected to the three-phase connection terminal 244 of the power supply connection unit 243 of the motor 1, whereby the inverter 21 can drive the motor 1.

According to this structure, the connection length of the bus bar 217 is shortened, whereby heat generation of the bus bar 217 can be reduced, and heat radiation performance can be improved by radiating more heat with the same cooling water.

A cooling water inlet 213 may be formed at one side of the inverter cover 212.

One side of the cooling water inlet 213 may communicate with the cooling water flow path of the cooling plate 214, and the other side thereof may be connected to a radiator disposed in front of the vehicle, and cooling water cooled at the radiator may flow into the cooling water flow path inside the inverter case 210 through the cooling water inlet 213.

A cooling water communication port 2143 may be formed on one side bottom surface of the cooling plate 214.

One side of the cooling water communication port 2143 may communicate with the cooling water flow path, and the other side thereof may communicate with the cooling water flow path inside the motor housing 10.

The cooling water inlet 213 is disposed adjacent to the capacitor 215, and the cooling water communication port 2143 is disposed adjacent to the plurality of bus bars 217.

The cooling water flowing in through the cooling water inlet 213 can move into the motor case 10 through the cooling water communication port 2143 after cooling the capacitor 215, the IGBT216, and the plurality of bus bars 217 in this order.

The motor housing 10 may be formed in a cylindrical shape with both sides open in the longitudinal direction.

The stator 24 and the rotor 25, etc. may be accommodated inside the motor housing 10 through the open side of the motor housing 10.

The stator core 240 may be formed in a cylindrical shape, and a plurality of EAR PARTs (EAR PARTs) 241 may be formed to protrude in a radial direction from an outer circumferential surface of the stator core 240. The plurality of ear portions 241 may extend along the longitudinal direction of the stator core 240, respectively. The plurality of ear portions 241 may be arranged at intervals in the circumferential direction of the stator core 240.

Bolt fastening holes are provided in the plurality of lug parts 241, and a plurality of bolts extending in the longitudinal direction of the stator core 240 pass through the bolt fastening holes of the respective lug parts 241, thereby fastening the stator core 240 to the motor case 10.

The gear housing 220 may be configured to cover a rear end portion of the motor housing 10. A plurality of fastening portions may be formed at the front end of the gear housing 220 and the rear end of the motor housing 10, respectively, and arranged at intervals in the circumferential direction. Fastening members such as bolts or the like may penetrate the fastening portions to fasten the gear case housing 220 and the motor housing 10.

The motor housing 10 may be provided with a plurality of ear accommodating parts 140. The ear accommodating part 140 may extend along the length direction of the motor housing 10, and may be formed to protrude outward in the radial direction of the motor housing 10. The ear accommodating part 140 may be formed to surround the ear 241.

When the motor case 10 is viewed from the front in the direction of inserting the stator core 240, the plurality of ear portions 241 and the plurality of ear receiving portions 140 may be disposed at approximately 90 degrees intervals on each of the upper left portion, the lower left portion, the upper right portion, and the lower right portion of the motor case 10.

The ear part 241 may be formed in a semicircular shape, and the upper two ear receiving parts 140 among the plurality of ear receiving parts 140 may be formed in a semicircular shape having a diameter larger than that of the ear part 241. Two ear receiving portions 140 of the lower portion among the plurality of ear receiving portions 140 may be formed to communicate with the upper portion of the sump portion 16.

The ear accommodating portion 140 is open forward in the longitudinal direction of the motor housing 10, and the ear 241 can be inserted from the open front of the ear accommodating portion 140.

The stator and rotor assembly may be inserted and mounted in a longitudinal direction of the motor housing 10. At this time, the ear 241 may be slidably coupled along the ear accommodating part 140. The combination of the ear 241 and the ear accommodating part 140 allows the stator and rotor assembly to slide in the length direction of the motor housing 10, but can prevent movement in the circumferential direction.

A fastening groove 145 is formed at a rear end portion of the ear receiving portion 140, and a bolt penetrating the ear portion 241 is fastened to the fastening groove 145, so that the stator core 240 can be fastened to the motor housing 10.

The ear receiving portion 140 may be formed such that the sectional area thereof gradually increases as it approaches the front from the rear in the longitudinal direction, and thus may be formed to be smoothly released from the mold at the time of die casting.

The motor housing 10 may be formed of a double wall. A cooling water flow path 11 may be formed between the outer side wall and the inner side wall in the radial direction in the double wall. The cooling water flow path 11 may be formed of a plurality of heat exchange compartments 110, a plurality of partition walls 120, and a plurality of communication holes 130. The plurality of heat exchange compartments 110 may be arranged at intervals in a circumferential direction inside the motor housing 10.

The plurality of heat exchange compartments 110 may extend in a length direction of the motor housing 10, respectively. Two heat exchange compartments 110 may be disposed between two ear accommodating parts 140 adjacent in the circumferential direction.

The plurality of heat exchange compartments 110 may be divided into a plurality in a circumferential direction by a plurality of partition walls 120. The plurality of partition walls 120 may extend in the longitudinal direction of the motor housing 10, respectively. The plurality of partition walls 120 may be arranged at intervals in the circumferential direction.

The plurality of partition walls 120 may protrude in a radial direction, respective outer ends of the plurality of partition walls 120 may be connected to an outer side wall of the motor housing 10, and respective inner ends of the plurality of partition walls 120 may be connected to an inner side wall of the motor housing 10.

The plurality of communication holes 130 are alternately formed at the front end portions of the plurality of partition walls 120 in the circumferential direction, and can communicate two heat exchange compartments 110 adjacent in the circumferential direction.

The plurality of heat exchange compartments 110 may be comprised of first through nth heat exchange compartments 111 through 110. In this embodiment, eight heat exchange compartments 110 may be provided.

The heat exchange compartment 110 communicating with the cooling water communication port 2143 among the plurality of heat exchange compartments 110 may be referred to as a first heat exchange compartment 111.

The heat exchange compartment 110 of the plurality of heat exchange compartments 110 in communication with the cooling water flow outlet 15 may be referred to as an eighth heat exchange compartment 118.

The first heat exchange compartment 111 and the eighth heat exchange compartment 118 are disposed adjacent to each other in the circumferential direction, and the partition wall 120 disposed at the uppermost end of the motor housing 10 among the plurality of partition walls 120 may be referred to as a first partition wall 121.

The first partition wall 121 may be disposed between the first heat exchange compartment 111 and the eighth heat exchange compartment 118, and may partition the first heat exchange compartment 111 and the eighth heat exchange compartment 118. The communication hole 130 is not formed at the front end portion or the rear end portion of the first partition wall 121. This is because, if the communication hole 130 is present in the first partition wall 121, the cooling water moves directly from the first heat exchange compartment 111 to the eighth heat exchange compartment 118 through the communication hole 130 differently from intended and flows out through the cooling water outlet 15 with almost no heat exchange.

The second heat exchange compartment 112 may be disposed to be spaced apart in the counterclockwise direction when viewed from the front of the motor housing 10. A left upper first ear receiving part 141 may be disposed between the first and second heat exchange compartments 111 and 112.

The third heat exchange compartment 113 may be spaced apart from the second heat exchange compartment 112 in a counterclockwise direction, and the communication hole 130 may be formed at a front end portion of the second partition wall 122 partitioning the second heat exchange compartment 112 and the third heat exchange compartment 113.

The fourth heat exchange compartment 114 may be spaced apart from the third heat exchange compartment 113 in a counterclockwise direction through the second ear receiving part 142 located at the lower left.

The fifth heat exchange compartment 115 may be spaced apart from the fourth heat exchange compartment 114 in a counterclockwise direction, and the communication hole 130 may be formed at a front end portion of the third partition wall 123 that partitions the fourth heat exchange compartment 114 and the fifth heat exchange compartment 115.

A sump portion 16 may be formed at a lower portion of the motor housing 10. The sump portion 16 may be formed in a quadrangular or trapezoidal shape.

The sump portion 16 may communicate with the circular inner space of the motor housing 10, and the oil sprayed to the inner space of the motor housing 10 may be temporarily stored in a lower portion of the sump portion 16. The sump portion 16 and the circular inner space may be partitioned by a fourth heat exchange compartment 114 and a fifth heat exchange compartment 115 disposed at a lower portion among the plurality of heat exchange compartments 110.

The support ribs 1151 may extend in the length direction of the motor housing 10 at the bottom surface of the fourth heat exchange compartment 114 or the fifth heat exchange compartment 115, and may support the fourth heat exchange compartment 114 and the fifth heat exchange compartment 115. The upper ends of the support ribs 1151 may be connected to the bottom surface of the fourth heat exchange compartment 114 or the fifth heat exchange compartment 115, and the lower ends of the support ribs 1151 may be connected to the bottom surface of the sump portion 16.

The sixth heat exchange compartment 116 may be disposed spaced apart from the fifth heat exchange compartment 115 in a counterclockwise direction through the third ear receiving portion 143. A sixth heat exchange compartment 116 may be formed at a right side surface of the motor housing 10 to face the third heat exchange compartment 113.

The seventh heat exchange compartment 117 may be disposed spaced counterclockwise from the sixth heat exchange compartment 116. The fourth dividing wall 124 may divide the sixth heat exchange compartment 116 and the seventh heat exchange compartment 117, and the communication hole 130 may be formed at a front end portion of the fourth dividing wall 124.

The eighth heat exchange compartment 118 may be spaced apart counterclockwise from the seventh heat exchange compartment 117 via a fourth ear receiving portion 144 located at the upper right.

The communication holes 130 may be formed respectively rearward of the fastening grooves 145 of each of the first to fourth ear receiving parts 141 to 144. The communication hole 130 formed at the rear of the first ear receiving part 141 may communicate the first and second heat exchange compartments 111 and 112 in a circumferential direction.

The communication hole 130 formed at the rear of the second ear accommodating part 142 may communicate the third and fourth heat exchange compartments 113 and 114 in a circumferential direction.

The communication hole 130 formed at the rear of the third ear receiving part 143 may communicate the fifth heat exchange compartment 115 and the sixth heat exchange compartment 116 in the circumferential direction.

The communication hole 130 formed at the rear of the fourth ear receiving part 144 may communicate the seventh heat exchange compartment 117 and the eighth heat exchange compartment 118 in the circumferential direction.

A cooling water outlet 15 may be formed at an upper portion of the motor housing 10. The lower end of the cooling water flow outlet 15 may communicate with the eighth heat exchange compartment 118, and the upper end of the cooling water flow outlet 15 may communicate with the outside.

A heat exchanger 17 may be provided on the outer side surface side of the motor housing 10. The heat exchanger 17 may be configured to exchange heat between the oil and the cooling water. A part of the heat exchanger 17 may be arranged to overlap the outer side surface of the sixth heat exchange compartment 116 in the radial direction, and another part of the heat exchanger 17 may be arranged to overlap the one side surface of the oil sump portion 16 in the thickness direction.

The heat exchanger 17 may be formed with a cooling water suction port 170. The cooling water outlet 15 of the motor case 10 may be connected to the cooling water suction port 170 of the heat exchanger 17. One side of the cooling water connection pipe 171 may be connected to the cooling water outlet 15, and the other side of the cooling water connection pipe 171 may be connected to the cooling water suction port 170 of the heat exchanger 17.

The cooling water flow path 11 may be formed inside the heat exchanger 17. The cooling water inlet 170 may be connected to the cooling water channel 11, and the cooling water outlet 172 may be formed in the heat exchanger 17 and communicate with the cooling water channel 11.

The cooling water discharge port 172 may be connected to a radiator disposed in front of the vehicle through a cooling water circulation line.

According to this configuration, after the radiator is cooled, the cooling water flows into the cooling water inlet 213 formed in the inverter cover 212, and moves along the cooling water flow path 11 formed in the cooling plate 214, thereby sequentially cooling the capacitor 215, the IGBT216, and the bus bar 217 housed in the inverter case 210.

Subsequently, the cooling water moves from the inverter housing 210 to the motor housing 10 through the cooling water communication port 2143. Since the cooling water communication port 2143 communicates with the first heat exchange compartment 111 of the motor housing 10, the cooling water may move toward the first heat exchange compartment 111.

Next, the cooling water moves in a zigzag pattern along the circumferential direction (counterclockwise direction) in the order of the first heat exchange compartment 111 to the eighth heat exchange compartment 118, thereby cooling the motor 1.

Next, the cooling water flowing out through the cooling water outlet 15 of the eighth heat exchange compartment 118 moves to the heat exchanger 17 through the cooling water connection pipe 171, thereby exchanging heat with the oil, and enabling the oil to be cooled.

Thereafter, the cooling water may be discharged through the cooling water discharge port 172 of the heat exchanger 17, moved to the radiator, discharged to the air by the radiator, and then circulated to the cooling water flow inlet 213 of the inverter cover 212 again, thereby cooling the inverter 21. The water pump of the vehicle can supply circulating power to the cooling water, move the cooling water discharged through the cooling water discharge port 172 to the radiator, and recirculate the cooling water from the radiator to the cooling water inflow port 213.

Fig. 10 is a conceptual view illustrating a moving path of oil of fig. 1, fig. 11 is a conceptual view illustrating a state where oil is injected through injection holes in the entire section in the circumferential direction of the motor case 10 of fig. 9 and the second oil flow path forming portion 182 formed at the gear case 220, fig. 12 is a conceptual view illustrating a path where oil is injected in the entire section in the circumferential direction of the oil injection case 19 of fig. 2, and fig. 13 is a conceptual view enlarging a portion XIII of fig. 4 and illustrating a path where oil is branched from the heat exchanger 17 to the inside of the motor case 10.

An oil flow path 180 may be formed inside the motor housing 10 and the gear housing 220 to flow oil, respectively. The oil flow path 180 may be configured by a first oil flow path forming portion 181 and a second oil flow path forming portion 182 that are disposed opposite to each other in the longitudinal direction in the motor case 10 and the gear case 220, respectively.

The first oil flow path forming portion 181 may extend in the circumferential direction at the rear end portion of the motor case 10, and may be formed to be open to the rear of the motor case 10.

The first oil flow path forming portion 181 may extend in the longitudinal direction of the motor case 10. The first oil flow path forming portion 181 may be formed inside the motor case 10.

The first oil flow path forming portion 181 may be formed of a double wall. The first oil flow path forming portion 181 may share the rear end portion of the inner wall of the motor housing 10 as the outer wall thereof. The inner wall of the first oil flow path forming portion 181 may be disposed radially inward from the rear end portion of the inner wall of the motor housing 10.

The second oil flow path forming portion 182 may be recessed and extended in the circumferential direction on the inner surface of the gear case 220. The second oil flow path forming portion 182 may be formed of a double wall. The double wall of the second oil flow passage forming portion 182 and the double wall of the first oil flow passage forming portion 181 may be disposed opposite to each other in the longitudinal direction, whereby one oil flow passage 180 may be formed. One oil flow path 180 may be formed in a circumferential direction.

The plurality of first injection nozzles 183 may be formed to penetrate the inner wall of the first oil flow path forming part 181 in the radial direction. The plurality of first injection nozzles 183 may be arranged at intervals in the circumferential direction of the first oil flow path forming portion 181.

An oil suction part 221 may be formed at one side of the gear housing 220. The oil suction part 221 may be configured by a first oil suction portion 2211 extending from the rear of the motor housing 10 toward the gear housing 220 in the axial direction and a second oil suction portion 2212 extending from the first oil suction portion 2211 in the radial direction.

The oil flowing into the oil flow path 180 through the oil suction portion 221 may be respectively branched 1/2 in opposite directions from one position of the oil flow path 180 to each other, and may be distributed to the plurality of first injection nozzles 183 while being rotationally moved to another position opposite to the one position at an interval of 180 degrees, thereby being injected toward the inner space of the motor housing 10 in the radial direction.

The oil is directly sprayed on the end turns of the stator coil 242 protruding from the rear end portion in the longitudinal direction of the stator core 240 in the axial direction, whereby the heat generated in the stator coil 242 can be absorbed.

The oils rotationally moving in opposite directions to each other may merge at the opposite other position.

The oil pump 230 may be mounted on a lower front portion of the oil injection housing 19. A pump inlet 231 may be formed at one side of the oil pump 230, and the pump inlet 231 may communicate with the bottom surface of the sump portion 16 through an oil suction pipe.

The oil pump 230 may draw oil from the sump portion 16 and pump it.

A pump outlet 232 may be formed at the other side of the oil pump 230, and the pump outlet 232 may communicate with an oil suction port formed at one side of the heat exchanger 17 through an oil discharge pipe. The pumped oil may flow into the heat exchanger 17.

The oil distribution flow path 184 may extend along the length direction of the motor housing 10. The oil distribution flow path 184 may have a longitudinal front end portion communicating with the oil suction portion 221 of the oil injection housing 19, and a longitudinal rear end portion of the oil distribution flow path 184 may communicate with the oil suction portion 221 of the gear case 220.

An oil discharge port 173 may be formed in the heat exchanger 17. The oil discharge port 173 may be formed to communicate with an intermediate portion of the oil distribution passage 184.

The heat exchanger 17 is configured to be able to exchange heat between oil and cooling water by providing the oil flow path 180 and the cooling water flow path 11.

The oil is sucked into the heat exchanger 17, cooled by heat exchange with the cooling water, and then flows from the oil distribution passage 184 to the front end and the rear end of the motor housing 10 in the longitudinal direction through the oil discharge port 173.

The oil flows from the rear end portion of the oil distribution passage 184 into the second oil flow passage forming portion 182 through the oil suction portion 221 of the gear case 220, then is distributed to each of the plurality of first injection nozzles 183 while rotating in the circumferential direction by the branch flows 1/2 in mutually opposite directions from the suction position of the second oil flow passage forming portion 182, and is injected to the stator coil 242 through the plurality of first injection nozzles 183, whereby the motor 1 can be cooled by both the oil and the cooling water.

An oil injection case 19 may be fastened to a front end portion of the motor case 10. The oil injection housing 19 may include an oil manifold 193, a power supply connection cover portion 194, and an oil sump cover portion 195.

The oil manifold 193 may protrude from one side surface of the oil injection housing 19 in a small diameter along the longitudinal direction of the motor housing 10 and extend in a circumferential direction. The oil manifold 193 may be formed of a double-walled structure.

The outer sidewall and the inner sidewall of the oil manifold 193 may be spaced apart in a radial direction, and an oil flow path 180 may be formed therebetween to flow oil. The plurality of second spray nozzles 196 may be formed to penetrate an inner sidewall of the oil manifold 193 in a radial direction.

The plurality of second spray nozzles 196 are arranged at intervals in the circumferential direction, and can spray oil over the entire 360-degree interval in the circumferential direction.

The oil jet case 19 may be configured to cover the cooling water flow path 11 of the motor case 10.

The power supply connection portion cover portion 194 may be formed to protrude upward from the upper portion of the oil injection housing 19 to surround the power supply connection portion 243.

The oil sump cover 195 is formed to protrude downward from the lower portion of the oil injection housing 19, and is configured to cover a forward opening portion of the oil sump portion 16.

The protective cap 20 may be fastened to cover the power supply connection portion 194 and the oil manifold 193 of the oil injection housing 19.

The oil suction portion 190 may extend in a radial direction from one side of the oil injection housing 19. One side of the oil suction part 190 may communicate with the oil manifold 193, and the other side of the oil suction part 190 may be connected with the oil pump 230.

The oil suction part 190 may be composed of a first oil suction part 191 extending in an axial direction and a second oil suction part 192 extending in a radial direction. The second oil suction portion 192 may be connected with an oil manifold 193.

The oil flowing into the oil manifold 193 through the oil suction portion 190 may be branched 1/2 in opposite directions from one position in the circumferential direction of the oil manifold 193 to each other, and may be moved from the one position to an opposite one position spaced apart from it by 180 degrees.

Since the two oils that have rotated in the opposite directions merge at the opposite position, the oil can be radially injected into the space inside the motor case 10 through the plurality of second injection nozzles 196 over the entire 360-degree interval.

The oil is directly sprayed to the end turns of the stator coil 242 protruding in the axial direction from the longitudinal front end of the stator core 240, whereby heat generated in the stator coil 242 can be absorbed.

The oil flows from the tip end portion of the oil distribution flow path 184 into the oil manifold 193 through the oil suction portion 190 of the oil injection housing 19, is branched from the suction position of the oil manifold 193 in the opposite direction to each other, is distributed to the plurality of second injection nozzles 196 while rotating and moving in the circumferential direction, and is injected to the stator coil 242 through the plurality of second injection nozzles 196, whereby the motor 1 can be cooled by both the oil and the cooling water.

A first GASKET may be provided between the protective cap 20 and the oil ejecting case 19 to seal between the protective cap 20 and the oil ejecting case 19, a second GASKET may be provided between the oil ejecting case 19 and the motor case 10 to seal between the oil ejecting case 19 and the motor case 10, and a third GASKET (gasset) may be provided between the motor case 10 and the gear case 220 to seal between the motor case 10 and the gear case 220.

Therefore, according to the present invention, the cooling water flow path 11 extending in the axial direction through which the cooling water flows and the oil flow path 180 extending in the circumferential direction through which the oil flows are provided inside the motor housing 10, and the motor is cooled by the cooling water and the oil, whereby the motor cooling performance and the motor output can be improved.

Further, the plurality of first injection nozzles 183 are disposed in the first oil flow passage forming portion 181 at intervals of 360 degrees in the circumferential direction, the first oil flow passage forming portion 181 is formed inside the rear end of the motor case 10 in the longitudinal direction in the circumferential direction, the plurality of second injection nozzles 196 are disposed in the oil manifold 193 at intervals of 360 degrees in the circumferential direction, the oil manifold 193 is formed inside the oil injection case 19 attached to the front end portion of the motor case 10 in the longitudinal direction in the circumferential direction, and the oil is directly injected to the end turns of the stator coils 242 through the plurality of first injection nozzles 183 and the second injection nozzles 196 over 360 degrees in the circumferential direction, whereby the heat radiation performance of the stator coils 242 can be improved.

Further, even when the vehicle of the electric vehicle is turning, or is driving on an uphill or downhill, or is accelerating or decelerating, by injecting the oil over the entire 360-degree section, the cooling performance of the oil can be uniformly maintained in the circumferential direction of the stator coil 242, and thus it is possible to prevent the occurrence of a dead zone (dead zone) in which oil is cooled without being wetted by the oil in a part of the coil due to the conventional oil wetting only in a part of the section of the stator coil 242.

Further, the cooling water flow path 11 of the motor housing 10 is formed as an axial flow path extending in the axial direction, so that the motor housing 10 can be manufactured by die casting, and the conventional gravity casting for forming a spiral flow path is not required, so that the productivity can be improved.

In particular, if necessary, a structure in which cooling is performed only with cooling water may be used in the motor 1 without providing an oil cooling structure. For example, in the case of a low-priced product, it may be configured only by a structure cooled by cooling water, without the oil pump 230, the heat exchanger 17, and the like.

Furthermore, by applying a structure in which cooling is performed by both oil and cooling water to the high-output motor 1, it is possible to continuously maintain a high output (60% of the maximum output) with respect to the maximum output.

In addition, by mounting the inverter 21 to constitute an integrated housing with the motor, cost can be saved and strength can be improved.

Further, by forming the cooling water flow path 11 in a zigzag shape extending in the axial direction and in the circumferential direction, even when the stator 24 is not press-fitted into the motor case 10, and the stator core 240 is of a type in which the lug portions 241(ear part) are formed at four positions and the stator 24 is bolt-fastened to the motor case 10, the cooling water flow path 11 structure can be formed in which the cooling water circulates while avoiding the positions of the bolt holes.

In particular, by mounting the capacitor 215, the IGBT216, and the bus bar 217 of the inverter 21 so as to be compactly inverted on the bottom surface of the cooling plate 214 and simultaneously cooling the capacitor 215, the IGBT216, and the bus bar 217 with cooling water, the cooling performance of the inverter 21 can be improved. Further, by flipping the electric components such as the capacitor 215 of the inverter 21, the length of the bus 217 connected to the three-phase ac power supply of the motor 1 is reduced, and thus the amount of heat generated by the bus 217 can be reduced, and the cooling efficiency can be improved.

Further, the cooling water indirectly cools the inverter 21 and the motor while moving along the internal flow paths of the inverter case 210 and the motor case 10, and then absorbs heat by heat exchange with the oil in the heat exchanger 17, whereby the heat radiation performance of the oil can be improved.

Furthermore, since the OIL is injected through the plurality of injection nozzles formed in the entire 360-degree interval in the circumferential direction inside the motor housing 10, it is not necessary to add a guide ring for OIL dripping (OIL DROPPING), and thus the number of parts and the number of assembly processes can be reduced, and the cost can be saved.