阅读说明：本技术 车辆用马达驱动装置 (Motor drive device for vehicle ) 是由 冈田学 小野浩二 于 2020-03-02 设计创作，主要内容包括：本发明提供一种车辆用马达驱动装置,其将马达旋转轴和输入齿轮轴之间通过花键嵌合结合,其中,将向输入齿轮轴内供给润滑油的供油喷嘴部件简单且可靠地固定于外壳。在电动马达部的马达旋转轴(25)和减速器部的输入齿轮轴(30)之间通过花键嵌合同轴连结的车辆用马达驱动装置中,在输入齿轮轴(30)的外板侧配置有向输入齿轮轴(30)内供给润滑油的供油喷嘴部件(85),供油喷嘴部件(85)具有插入到输入齿轮轴(30)的喷嘴部(85a)和沿主体部的外周向径向外侧突出的弹性支承部(85g),供油喷嘴部件(85)插入到设置于减速器外壳(22)的供油喷嘴部件用安装孔(72d),通过弹性支承部(85g)固定于供油喷嘴部件用安装孔(72d),从贮油部(22d)向供油喷嘴部件(85)赋予润滑油。(The invention provides a motor driving device for a vehicle, which combines a motor rotating shaft and an input gear shaft through spline fitting, wherein an oil supply nozzle component for supplying lubricating oil to the input gear shaft is simply and reliably fixed on a shell. In a motor drive device for a vehicle in which a motor rotation shaft (25) of an electric motor portion and an input gear shaft (30) of a speed reducer portion are coaxially coupled by spline fitting, an oil nozzle member (85) for supplying lubricating oil into the input gear shaft (30) is disposed on the outer plate side of the input gear shaft (30), the oil nozzle member (85) has a nozzle portion (85a) inserted into the input gear shaft (30) and an elastic support portion (85g) protruding radially outward along the outer periphery of a main body portion, the oil nozzle member (85) is inserted into a nozzle member mounting hole (72d) provided in a speed reducer housing (22), is fixed to the oil nozzle member mounting hole (72d) by the elastic support portion (85g), and supplies lubricating oil from an oil storage portion (22d) to the oil nozzle member (85).)

1. A motor drive device for a vehicle, comprising an electric motor portion generating a driving force and a speed reducer portion reducing and outputting the rotation of the electric motor portion, wherein the speed reducer portion comprises an input gear shaft having an input gear, an intermediate gear shaft having an input-side large-diameter gear and an output-side small-diameter gear, and an output gear shaft having an output gear, the input gear shaft being coaxially coupled to a motor rotation shaft of the electric motor portion by spline fitting,

the input gear shaft is composed of a hollow shaft, an oil supply nozzle component for supplying lubricating oil into the hollow shaft of the input gear shaft is arranged on the outer plate side of the input gear shaft,

the oil supply nozzle member has a nozzle portion inserted into the hollow shaft, a disk-shaped main body portion, and an elastic support portion projecting radially outward along an outer periphery of the main body portion,

the oil supply nozzle component is inserted into an oil supply nozzle component mounting hole arranged on the speed reducer shell and fixed on the oil supply nozzle component mounting hole through the elastic supporting part,

an oil reservoir for supplying lubricating oil to the oil supply nozzle member is formed between an inner wall of the speed reducer case and the oil supply nozzle member fixed to the speed reducer case.

2. The vehicular motor drive apparatus according to claim 1,

the speed reducer case is divided into a motor-side case and an outer-plate-side case, and the attachment hole for the oil supply nozzle member is provided in the outer-plate-side case.

3. The vehicular motor drive apparatus according to claim 2,

one end of the input gear shaft is rotatably supported via a rolling bearing in a gear shaft mounting hole provided in the motor side housing, and the other end of the input gear shaft is rotatably supported via a rolling bearing in a gear shaft mounting hole provided in an inner wall of the outer plate side housing.

4. The vehicular motor drive apparatus according to any one of claims 1 to 3,

the oil nozzle member has an edge portion formed on an outer periphery of the main body, and an elastic support portion is formed on the edge portion.

5. The vehicular motor drive apparatus according to claim 4,

the elastic support portion is formed by an elastic support piece formed by cutting and raising the edge portion to the radial outer side.

6. The vehicular motor drive apparatus according to claim 4,

the elastic support portion is formed of a semicircular projection portion formed on the edge portion and projecting radially outward.

Technical Field

The present invention relates to a motor drive device for a vehicle, and more particularly to a lubricating oil supply structure in a motor drive device for a vehicle.

Background

There is an in-wheel motor drive device that drives a wheel by decelerating the rotation of an electric motor through a reduction gear using the electric motor housed inside the wheel as a drive source.

As a reduction gear of an in-wheel motor drive device, there is a gear drive reduction gear including an input gear shaft rotated by an output torque of an electric motor, an output gear shaft output to a drive wheel, and an intermediate gear shaft provided between the input gear shaft and the output gear shaft, and sequentially reducing the output torque of the electric motor and outputting a large output torque from the output gear shaft.

The gear drive reducer uses lubricating oil for lubrication or cooling. As a method of supplying the lubricating oil, there is a splash system using a rotational force of a speed reduction element (gear or pulley) or a pump system using a pump to forcibly circulate the lubricating oil.

Patent document 1 discloses an in-wheel motor drive device that supplies lubricant using a pump system. The in-wheel motor drive device described in patent document 1 will be described with reference to fig. 12.

The in-wheel motor drive device 100 includes an electric motor portion a that generates drive force, a speed reducer portion B that reduces the speed of rotation of the electric motor portion a and outputs the reduced speed, and a wheel bearing portion C that transmits the output from the speed reducer portion B to a rear wheel as a drive wheel.

The electric motor section a and the speed reducer section B are housed in a case 190. The housing 190 is composed of a motor housing 191 and a decelerator housing 192.

The electric motor unit a includes a stator 123 fixed to a motor housing 191, a rotor 124 disposed radially inward of the stator 123 so as to face each other with a gap therebetween, and a motor rotation shaft 125 disposed radially inward of the rotor 124 and rotating integrally with the rotor 124.

The speed reducer unit B is a parallel shaft gear speed reducer, and includes: an input gear shaft 132 having an input gear 132a to which power is transmitted from the motor rotation shaft 125; a first intermediate gear shaft 133 having a first large-diameter gear 133a meshing with the input gear 132a and a first small-diameter gear 133b meshing with the second large-diameter gear 134 a; a second intermediate gear shaft 134 having the second large-diameter gear 134a and a second small-diameter gear 134b meshing with the output gear 135 a; an output gear shaft 135 having an output gear 135 a.

The input gear shaft 132 has a cylindrical body portion having a diameter larger than the front end portion 125e of the motor rotation shaft 125, and the front end portion 125e is coaxially coupled to the input gear shaft 132 by spline fitting (including fitting by spline machining and fitting by serration machining, the same applies hereinafter).

The structure for supplying the lubricating oil to the in-wheel motor drive device 100 described above includes: an oil tank 147 provided below the reduction gear unit B and storing lubricating oil; an oil pump 154 that draws lubricating oil from the oil tank 147; a suction oil passage (not shown) and a discharge oil passage 164 extending in the vertical direction; and an oil pipe 170 extending in the axial direction of the vehicle.

The oil pipe 170 has an inlet port 176 into which the lubricating oil pumped by the oil pump 154 flows, and an outlet port 177 provided between one end and the other end and discharging the lubricating oil flowing in from the inlet port 176 downward.

According to this lubricating oil supply structure, the outlet port 177 for lubricating oil is formed between one end and the other end of the oil pipe 170 attached and fixed to the upper portions of the electric motor portion a and the reducer portion B, and the outlet port 177 is provided at a position facing a portion requiring lubrication or cooling, whereby the lubricating oil can be supplied to the required portion accurately.

The in-wheel motor drive device 100 described above supplies the lubricating oil pumped by the oil pump 154 to the gear tooth surfaces or the inside of the bearings. However, it is not considered to supply the lubricating oil between the motor rotating shaft 125 and the input gear shaft 132 of the reduction gear unit B coupled thereto.

As described above, when the motor rotation shaft 125 and the input gear shaft 132 are coupled to each other by spline fitting, there is a problem that an oil film at the coupling portion is likely to break.

The present inventors have studied a structure for supplying lubricating oil to a joint portion to be joined by spline fitting in a motor drive device for a vehicle in which a motor rotation shaft of an electric motor portion and an input gear shaft of a reduction gear portion are coaxially connected by spline fitting.

Patent document 2 discloses a structure in which a hollow hole is formed in a rotating shaft, and lubricating oil is supplied into the hollow hole of the rotating shaft. In patent document 2, a lubricating structure for supplying lubricating oil to a bearing that supports a rotating shaft in a transmission is configured such that a hollow hole is formed in the rotating shaft, an oil jacket (oil supply nozzle member) that communicates with a hydraulic circuit is provided at one end of the hollow hole, and lubricating oil is supplied into the hollow hole. In the structure described in patent document 2, an oil jacket is press-fitted to a housing.

As described in patent document 2, the present inventors studied the following structure: the input gear shaft is formed of a hollow shaft, an oil supply nozzle member is provided at an end portion of the input gear shaft, lubricating oil is supplied from the oil supply nozzle member into the hollow shaft, and the lubricating oil is supplied to a coupling portion coupled by spline fitting. When the oil supply nozzle member is provided at the end of the hollow shaft, it is conceivable to press and fix the oil supply nozzle member to the housing.

In order to press-fit and fix the fuel filler nozzle member to the housing, it is necessary to strictly control the dimensional accuracy of the mounting hole for the fuel filler nozzle member provided in the housing and the external shape of the fuel filler nozzle member.

Further, if the outer shape of the nozzle member is configured to be smaller than the mounting hole for the nozzle member and the nozzle member is inserted into the mounting hole for the nozzle member, a margin is provided in terms of dimensional accuracy. However, the fuel nozzle member may be detached from the mounting hole during assembly, which may result in poor assembly workability.

Further, if a gap exists between the fuel filler nozzle member and the mounting hole for the fuel filler nozzle member, noise is generated when the motor drive apparatus for a vehicle is operated. In addition, the oil supply nozzle member vibrates, and thus the life is also deteriorated. Further, the method of fixing the oil supply nozzle member by the adhesive has problems of adverse effect on the lubricating oil characteristics, deterioration in life, reliability, and work efficiency, and cannot be adopted. Therefore, there arises a problem that the number of parts such as individual parts that need to be mechanically reliably fixed increases.

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to easily and reliably fix an oil supply nozzle member for supplying lubricating oil into an input gear shaft to a housing in a motor drive device for a vehicle in which a motor rotating shaft and the input gear shaft are coupled by spline fitting.

Means for solving the problems

The invention provides a motor driving device for a vehicle, which comprises an electric motor part for generating driving force and a speed reducer part for reducing the speed and outputting the rotation of the electric motor part, wherein the speed reducer part comprises an input gear shaft which is accommodated in a speed reducer shell and is provided with an input gear, an intermediate gear shaft which is provided with an input-side large-diameter gear and an output-side small-diameter gear, and an output gear shaft which is provided with an output gear, the input gear shaft is coaxially connected with a motor rotating shaft of the electric motor part through spline fitting, the motor driving device is characterized in that the input gear shaft is composed of a hollow shaft, an oil supply nozzle component for supplying lubricating oil into the hollow shaft of the input gear shaft is arranged on the outer plate side of the input gear shaft, the oil supply nozzle component is provided with a nozzle part inserted into the hollow shaft, a disc-shaped main body part and an elastic supporting part which protrudes outwards, the oil supply nozzle member is inserted into an oil supply nozzle member mounting hole provided in the decelerator housing, and is fixed to the oil supply nozzle member mounting hole by the elastic support portion, and an oil reservoir for supplying lubricating oil to the oil supply nozzle member is formed between an inner wall of the decelerator housing and the oil supply nozzle member fixed to the decelerator housing.

In the present invention, the lubricating oil is fed from the oil supply nozzle section into the input gear shaft constituted by the hollow shaft. Further, the lubricating oil is stably supplied to the spline fitting portion of the input gear shaft and the motor rotating shaft. As a result, poor lubrication at the joint portion can be prevented. Further, since the attachment hole for the fuel filler nozzle member and the fuel filler nozzle member can be fixed by the elastic support portion, a margin can be created in the respective dimensional accuracies, and the attachment work is also easy.

The reduction gear case is divided into a motor-side case and an outer-plate-side case, and the attachment hole for the oil supply nozzle member is provided in the outer-plate-side case.

In the present invention, the input gear shaft has one end rotatably supported via a rolling bearing in a gear shaft mounting hole formed in an inner wall of the motor-side housing and the other end rotatably supported via a rolling bearing in a gear shaft mounting hole provided in an inner wall of the outer-plate-side housing, and the oil nozzle member mounting hole is coaxially provided on an outer plate side of the gear shaft mounting hole.

The fuel nozzle member may have an edge portion provided on an outer periphery of the main body, and the edge portion may have an elastic support portion.

The elastic support portion may be formed by an elastic support piece formed by cutting and raising the edge portion radially outward.

The elastic support portion may be formed of a semicircular projection formed on the edge portion so as to project radially outward.

Effects of the invention

According to the present invention, the fuel filler nozzle member can be easily fixed to the mounting hole for the fuel filler nozzle member by the elastic support portion provided to the fuel filler nozzle member. Further, the lubricating oil is supplied to the joint portion where the motor rotation shaft and the input gear shaft of the reduction gear portion are joined by spline fitting via the oil supply nozzle member, and the oil film at the joint portion can be prevented from being broken.

Drawings

Fig. 1 is a vertical cross-sectional view schematically showing a basic structure of an in-wheel motor drive device and a lubricating oil supply structure according to a first embodiment of the present invention.

Fig. 2 is a cross-sectional view schematically showing an internal structure of a speed reducer portion and a lubricating oil supply structure of an in-wheel motor drive device according to a first embodiment of the present invention.

Fig. 3 is an enlarged view of a portion where the fuel nozzle member according to the first embodiment of the present invention is fixed to the mounting hole.

Fig. 4 is a perspective view showing an oil supply nozzle member according to a first embodiment of the present invention.

Fig. 5 is a front view showing an oil supply nozzle member according to a first embodiment of the present invention.

Fig. 6 is an enlarged reference view of the elastic support piece portion of the oil supply nozzle member according to the first embodiment of the present invention.

Fig. 7 is a longitudinal sectional view schematically showing a state where the in-wheel motor drive device according to the first embodiment of the present invention is assembled.

Fig. 8 is a perspective view showing an oil supply nozzle member according to a second embodiment of the present invention.

Fig. 9 is a front view showing an oil supply nozzle member according to a second embodiment of the present invention.

Fig. 10 is an enlarged reference view of a projection portion of an oil supply nozzle member according to a second embodiment of the present invention.

Fig. 11 is an enlarged view of a portion where an oil nozzle member according to a second embodiment of the present invention is fixed to a mounting hole.

Fig. 12 is a vertical cross-sectional view schematically showing a basic structure of a conventional in-wheel motor drive device and a lubricating oil supply structure.

Detailed Description

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and description thereof will not be repeated.

First, a basic configuration example of an in-wheel motor driving device 10 as a vehicle motor driving device according to a first embodiment of the present invention will be described with reference to fig. 1 and 2.

The in-wheel motor drive device 10 is mounted on a passenger vehicle such as an electric vehicle or a hybrid vehicle. In the following description, in a state where the in-wheel motor drive device 10 is mounted on a vehicle, a side of the vehicle that is located on an outer side is referred to as an outer panel side, and a side located on a center is referred to as an inner panel side.

Fig. 1 is a longitudinal sectional view of an in-wheel motor drive device 10 according to an embodiment of the present invention, taken along a plane including the line D-O-E shown in fig. 2, and viewed with the line I-I as an arrow. Fig. 2 is a cross-sectional view showing an internal structure of the reduction gear unit B of the in-wheel motor drive device 10, and schematically shows a state viewed from the outer panel side.

As shown in fig. 1, the in-wheel motor drive device 10 includes an electric motor portion a that drives a wheel (virtual line W in fig. 2), a wheel bearing portion C connected to the wheel, and a speed reducer portion B that reduces the speed of rotation of the electric motor portion a and transmits the reduced speed to the wheel bearing portion C, and is provided with a wheel cover (not shown) formed on the vehicle width direction outer side of a vehicle (passenger car).

The electric motor portion a, the speed reducer portion B, and the wheel bearing portion C are accommodated in the housing 20, respectively. In this embodiment, the housing 20 has a separable structure. The housing 20 is desirably made of light metal such as aluminum or aluminum alloy. In this embodiment, the housing 20 includes a motor housing 21 and a reduction gear housing 22.

The electric motor unit a is constituted by a radial gap type electric motor 26, and the radial gap type electric motor 26 includes a stator 23 fixed to the motor housing 21, a rotor 24 disposed on a radially inner side of the stator 23 so as to face each other with a gap therebetween, and a motor rotating shaft 25 disposed on a radially inner side of the rotor 24 and rotating integrally with the rotor 24. The motor rotation shaft 25 can be rotated at a high speed of about 1 ten thousand rpm. The stator 23 is formed by winding a coil 23a around a magnetic core, and the rotor 24 is formed of a permanent magnet or the like. The electric motor 26 can also be applied to an axial gap type.

The motor rotating shaft 25 is rotatably supported at one axial end portion (left side in fig. 1) thereof by the motor housing 21 through a rolling bearing 40, and at the other axial end portion (right side in fig. 1) thereof by the motor housing 21 through a rolling bearing 41.

The motor case 21 is cylindrical, and a motor case cover 21v is connected to an inner plate side end portion of the motor case 21.

The speed reducer section B includes: an input gear shaft 30 having an input gear 30a, an intermediate gear shaft 31 having a large diameter gear 31a on the input side and a small diameter gear 31b on the output side as intermediate gears, and an output gear shaft 36 having an output gear 36 a.

The input gear shaft 30 integrally has an input gear 30 a. The input gear shaft 30 is formed of a hollow shaft, and the input gear shaft 30 is coaxially coupled to the motor rotating shaft 25 by spline fitting. The intermediate gear shaft 31 is integrally formed with the large-diameter gear 31a and the small-diameter gear 31 b. The output gear 36a and the output gear shaft 36 are integrally formed.

The input gear shaft 30, the intermediate gear shaft 31, and the output gear shaft 36 are arranged in parallel with each other. The input gear shaft 30 is rotatably supported at both end portions thereof by the reducer case 22 via rolling bearings 42 and 43, the intermediate gear shaft 31 is rotatably supported at both end portions thereof by the reducer case 22 via rolling bearings 44 and 45, and the output gear shaft 36 is rotatably supported at both end portions thereof by the reducer case 22 via rolling bearings 48 and 49. In this embodiment, the reducer case 22 is divided into a motor side case 22a and an outer plate side case 22 b.

Specifically, the input gear shaft 30 is rotatably supported at its inner-plate-side end portion via the rolling bearing 42 in a gear shaft mounting hole 71a formed in the inner wall of the motor-side housing 22a, and at its outer-plate-side end portion via the rolling bearing 43 in a gear shaft mounting hole 71b formed in the outer-plate-side housing 22 b. The gear shaft mounting hole 71b is formed by machining a boss portion 71c provided on the inner wall of the outer plate-side reducer case of the reducer case 22.

The intermediate gear shaft 31 is rotatably supported at an end portion on the inner plate side in a gear shaft mounting hole 72a formed in the inner wall of the motor-side housing 22a via a rolling bearing 44, and at an end portion on the outer plate side in a gear shaft mounting hole 72b formed in the inner wall of the outer-plate-side housing 22b via a rolling bearing 45.

The output gear shaft 36 is rotatably supported at its inner plate-side end portion via a rolling bearing 48 in a gear shaft mounting hole 73a formed in the inner wall of the motor-side housing 22a, and at its outer plate-side end portion via a rolling bearing 49 in a gear shaft mounting hole 73b formed in the inner wall of the outer plate-side housing 22 b.

As shown in fig. 1 and 2, in the reducer portion B, the input gear 30a meshes with the large-diameter gear 31a, and the small-diameter gear 31B meshes with the output gear 36 a. The number of teeth of the large diameter gear 31a is larger than the number of teeth of the input gear 30a and the small diameter gear 31b, and the number of teeth of the output gear 36a is larger than the number of teeth of the small diameter gear 31 b. According to the above configuration, the parallel shaft type gear reducer is configured to reduce the rotational motion of the motor rotating shaft 25 in two stages. The reduction mechanism composed of two-stage parallel shaft gears has a small number of parts, and can achieve both high reduction ratio and miniaturization.

In this embodiment, helical gears are used as the input gear 30a, the large diameter gear 31a, the small diameter gear 31B, and the output gear 36a that constitute the reduction gear unit B. The helical gears are effective in a point of silence and less torque variation because the number of teeth meshing at the same time increases and the teeth touch and touch are dispersed. Considering the gear mesh ratio, the limit rotational speed, and the like, it is preferable to set the module of each gear to about 1 to 3.

As shown in fig. 1, the wheel bearing portion C is formed of an inner ring rotation type wheel bearing 50. The wheel bearing 50 is a double-row angular ball bearing having an inner member 61 including a hub wheel 60 and an inner ring 52, an outer ring 53, balls 56, and a cage (not shown) as main components.

A wheel mounting flange 60a is formed on the outer periphery of the hub wheel 60 on the outer plate side, and the inner ring 52 is fitted and fixed to the small-diameter stepped portion on the inner plate side by caulking. The caulking portion 60b fixes the inner race 52 after the wheel bearing 50 is assembled, and applies a preload to the wheel bearing 50. An outer plate-side inner track surface 54a is formed on the outer periphery of the hub wheel 60, and an inner plate-side inner track surface 54b is formed on the outer periphery of the inner wheel 52. Although not shown, a brake disk and a wheel are attached to the wheel attachment flange 60 a. The output gear shaft 36 is spline-fitted to the hub wheel 60 and is connected to be able to transmit torque.

A flange portion 53a is formed on the outer periphery of the outer ring 53, the flange portion 53a is fastened to the wheel bearing support member 51 by bolts 53b, and a flange portion 51a formed on the outer periphery of the wheel bearing support member 51 is fastened to the reduction gear case 22 by bolts 51 b. Thus, the wheel bearing 50 and the reducer case 22 are coupled. The inside of the wheel bearing 50 is lubricated with grease.

The motor rotating shaft 25 of the electric motor 26 and the axis M that serves as the rotation center of the rotor 24 extend parallel to the axis P of the wheel bearing C. The electric motor portion a is offset from the axis P of the wheel bearing portion C.

A part (upper part) of the inner wall portion of the motor side case 22a functions as a partition wall that divides an internal space (hereinafter referred to as a "motor chamber") 210 of the electric motor portion a and an internal space (hereinafter referred to as a "speed reduction chamber") 220 of the speed reduction unit B.

As shown in fig. 2, the in-wheel motor drive device 10 of the present embodiment immerses the output gear 36a at the lowest stage of the reduction gear unit B in the lubricating oil, collects the lubricating oil by rotation of the gears, and supplies the lubricating oil to the gears of the reduction gear unit B.

Next, the vehicle longitudinal direction position of each shaft of the reducer portion B will be described. As shown in fig. 2, the axis M of the input gear shaft 30 having the input gear 30a is disposed in the vehicle front direction with respect to the axis P of the output gear shaft 36 having the output gear 36 a. The axis N of the intermediate gear shaft 31 having the large-diameter gear 31a and the small-diameter gear 31b is disposed further to the vehicle rear side than the axis M of the input gear shaft 30 and further to the vehicle front side than the axis P of the output gear shaft 36 having the output gear 36 a.

The vertical positions of the shafts are explained, and the axis M of the input gear shaft 30 is disposed below the axis P of the output gear shaft 36. The axis N of the intermediate gear shaft 31 is arranged above the axis M of the input gear shaft 30.

As shown in fig. 2, the reduction gear case 22 has a lower portion 22f of the output gear 36a and a portion that protrudes downward at a position away from the axis P of the output gear 36a in the vehicle front direction. The protruding portion forms a tank 81 and is disposed below the lower portion 22 f.

Next, a structure for supplying lubricating oil in the in-wheel motor drive device 10 will be described with reference to fig. 1 to 6. Fig. 3 is an enlarged longitudinal sectional view schematically showing a lubricating oil supply portion of an in-wheel motor drive device according to a first embodiment of the present invention, fig. 4 is a perspective view showing an oil nozzle member according to the first embodiment of the present invention, fig. 5 is a front view showing the oil nozzle member according to the first embodiment of the present invention, and fig. 6 is an enlarged reference view showing an elastic support piece portion of the oil nozzle member according to the first embodiment of the present invention. In fig. 1 to 3, the arrow lines schematically show the flow of the lubricating oil.

As shown in fig. 1 and 3, in this embodiment, in order to supply the lubricating oil into the input gear shaft 30, a gap is provided between the inner wall of the outer plate-side housing 22b and the boss portion 71c in which the attachment hole 71d for the oil supply nozzle member is formed, at a position facing the outer plate-side end portion of the input gear shaft 30, and the oil reservoir portion 22d is formed in this gap portion. The lubricating oil collected from the output gear 36a is supplied to the oil reservoir 22d through the oil passage 22 e.

As shown in fig. 2, the oil reservoir 22d is provided with a lubricant guide 93 for guiding the lubricant collected from the output gear 36a to the oil reservoir 22 d. The lubricant oil guide 93 extends upward from above the output gear 36a along the shape of the reduction gear case 22, and extends downward from a middle portion of the large diameter gear 31a of the intermediate gear shaft 31 to the vicinity of the oil passage 22 e. A second lubricating oil guide 94 is provided to receive the lubricating oil flowing from the lubricating oil guide 93 from below and guide the lubricating oil to the oil reservoir 22 d.

As shown in fig. 3, in the boss portion 71c of the outer plate-side housing 22b, an oil supply nozzle member mounting hole 71d having a smaller diameter than the gear shaft mounting hole 71b is provided coaxially in series with the gear shaft mounting hole 71 b. A disk-shaped fuel nozzle member 85 is fitted into the fuel nozzle member mounting hole 71 d. The fuel nozzle member 85 is elastically deformed by an elastic support portion (elastic support piece 85g) provided on the outer periphery thereof and fitted into the fuel nozzle member attachment hole 71 d. The elastic support portion (elastic support piece 85g) abuts against the inner peripheral surface of the nozzle member mounting hole 71d, and the nozzle member 85 is fixed to the nozzle member mounting hole 71 d.

When the fuel nozzle member 85 is attached to the fuel nozzle member attachment hole 71d, the opening 71f is closed. The space region formed between the fuel nozzle member 85 and the inner wall 22c at a position facing the outer plate side end portion of the input gear shaft 30 serves as the oil reservoir 22 d.

The opening area of the nozzle portion 85a provided in the fuel nozzle member 85 is smaller than the cross-sectional area of the main body portion 85h of the fuel nozzle member 85, and the lubricating oil is stored in the oil reservoir 22d, and the lubricating oil is fed from the nozzle portion 85a communicating with the oil reservoir 22d into the input gear shaft 30. While the oil reservoir 22d is storing the lubricating oil, the lubricating oil can be supplied.

As described above, the oil nozzle member 85 is provided with the nozzle portion 85a at the center, and the lubricating oil is supplied from the nozzle portion 85a into the input gear shaft 30. The nozzle portion 85a is inserted into the input gear shaft 30. Therefore, the outer diameter of the nozzle portion 85a is smaller than the inner diameter of the hollow shaft of the input gear shaft 30, and both are configured not to contact each other.

Referring to fig. 4 to 6, the oil supply nozzle member 85 according to the first embodiment will be described. The oil nozzle member 85 is provided with a nozzle portion 85a extending in the axial direction at the center of a disk-shaped body portion 85 h. Further, a rim 85f is provided on the outer periphery of the body 85 h. A plurality of elastic support pieces 85g serving as elastic support portions formed by cutting radially outward are formed on the edge portion 85 f.

The elastic support piece 85g is formed by being cut so as to protrude while being bent radially outward toward the front end of the nozzle portion 85a, and is elastically deformed if a force is applied radially inward. Further, if no force is applied, the force returns to the outside in the radial direction. In the first embodiment, elastic support pieces 85g are provided at four positions of the edge portion 85f, shifted by 90 degrees from each other.

The fuel nozzle member 85 according to the first embodiment is formed such that the outer diameter of the edge portion 85f is slightly smaller than the inner diameter of the fuel nozzle member attachment hole 71d, and the protruding tip of the elastic support piece 85g is larger than the inner diameter of the fuel nozzle member attachment hole 71 d. The elastic support piece 85g is formed by providing a notch 85e in the edge 85f and performing a cutting process, and is intended to be easily elastically deformed. The oil nozzle member 85 is inserted into the oil nozzle member mounting hole 71d by this elastic deformation. After the insertion, the elastic support piece 85g abuts against the attachment hole 71d for the oil supply nozzle member, and the oil supply nozzle member 85 is fixed to the attachment hole 71d for the oil supply nozzle member.

As shown in fig. 3, the nozzle 85a is directed toward the input gear shaft 30, and the fuel nozzle member 85 is press-fitted into the fuel nozzle member mounting hole 71 d. At this time, the elastic support piece 85g is bent outward in the radial direction toward the front end of the nozzle portion 85a and protrudes. That is, since the insertion side is small, the nozzle unit can be easily inserted into the nozzle unit mounting hole 71d, and after the insertion, the elastic support piece 85g is radially expanded to abut against the inner peripheral surface of the nozzle unit mounting hole 71d, thereby mounting and fixing the nozzle unit 85.

In this way, the fuel filler nozzle member 85 is inserted and fixed into the fuel filler nozzle member attachment hole 71d by the elastic deformation of the elastic support piece 85g, and therefore, there is a margin for the respective dimensional errors. This also allows for a margin in size management.

As shown in fig. 1, if the oil nozzle member 85 is fitted into the oil nozzle member mounting hole 71d, the center of the nozzle portion 85a is formed so as to coincide with the axis M.

The space region formed between the fuel nozzle member 85 and the inner wall 22c at a position facing the outer plate side end portion of the input gear shaft 30 serves as the oil reservoir 22 d.

In addition, the oil supply nozzle member 85 functions in the following manner: the portion of the rolling bearing 43 is covered, and the lubricating oil flowing from the outer plate side to the inner plate side is suppressed from directly entering the inside of the rolling bearing 43, and is sent from the nozzle portion 85a into the hollow input gear shaft 30. Further, the lubricating oil flowing out from the inside of the input gear shaft 30 and the lubricating oil around the nozzle portion 85a and the end portion of the input gear shaft 30 are supplied to the inside of the rolling bearing 43.

The lubricating oil stored in the oil reservoir 22d is fed from the oil supply nozzle member 85 into the hollow input gear shaft 30. Further, the lubricating oil is stably supplied to the joint portion formed by spline fitting of the input gear shaft 30 and the motor rotary shaft 25. As a result, the occurrence of lubrication failure in the joint formed by spline fitting can be prevented.

As shown in fig. 7, the outer plate side case 22b and the motor side case 22a are assembled by placing the motor side case 22a on the lower side and covering the outer plate side case 22b from the upper side. At this time, the nozzle member 85 is mounted in the nozzle member mounting hole 71d of the outer shell 22 b. As described above, the elastic support piece 85g of the fuel nozzle member 85 is fixed in contact with the mounting hole 71d for the fuel nozzle member. Therefore, the fuel nozzle member 85 can be attached so as not to fall out of the fuel nozzle member attachment hole 71 d.

Further, since the elastic support piece 85g of the fuel nozzle member 85 is in contact with and fixed to the mounting hole 71d for the fuel nozzle member, the occurrence of rattling is prevented even during operation, noise is not generated, and deterioration in service life can be suppressed.

Next, a second embodiment of the present invention will be described with reference to fig. 8 to 11. The fuel nozzle member 85 of the second embodiment is the same as the fuel nozzle member of the first embodiment except for the structure of the elastic support portion, and therefore the same parts are denoted by the same reference numerals, and the description thereof is omitted for the purpose of avoiding redundancy.

The fuel nozzle member 85 of the second embodiment is also provided with a nozzle portion 85a extending in the axial direction at the center of the disk-shaped body portion 85h, as in the first embodiment. Further, a rim 85f is provided on the outer periphery of the body 85 h. A plurality of semicircular projections 85i serving as elastic support members are provided on the edge portion 85f, and the projections 85i are formed to protrude radially outward. In the second embodiment, the projecting portions 85i are provided at four positions of the edge portion 85f, which are separated from each other by 90 degrees.

The fuel nozzle member 85 according to the second embodiment is formed such that the outer diameter of the edge portion 85f is slightly smaller than the inner diameter of the fuel nozzle member mounting hole 71d, and the semicircular apex portion of the protrusion 85i is positioned outside the fuel nozzle member mounting hole 71 d. When the oil nozzle member 85 is inserted into the oil nozzle member mounting hole 71d, the edge portion 85f is elastically deformed about the protrusion 85 i. After the insertion, the protrusion 85i abuts against the inner peripheral surface of the attachment hole 71d for the oil nozzle member, and the oil nozzle member 85 is fixed to the attachment hole 71d for the oil nozzle member.

Since the protrusions 85i are formed at positions 90 degrees apart from each other at the edge 85f, the edge 85f portion including the protrusions 85i is easily elastically deformed. By this elastic deformation, the oil supply nozzle member 85 is inserted into the oil supply nozzle member attachment hole 71 d. After the insertion, the protrusion 85i abuts against the inner peripheral surface of the attachment hole 71d for the oil nozzle member, and the oil nozzle member 85 is fixed to the attachment hole 71d for the oil nozzle member.

As shown in fig. 11, the fuel nozzle member 85 is press-fitted and fixed to the fuel nozzle member attachment hole 71d so that the nozzle portion 85a faces the input gear shaft 30. In this case, the protrusion 85i is formed to protrude in a semicircular shape, and therefore can be easily inserted into the attachment hole 71d for the fuel filler nozzle member. After the insertion, the protrusion 85i abuts against the inner peripheral surface of the attachment hole 71d for the oil supply nozzle member, and the oil supply nozzle member 85 is attached and fixed.

In the above-described embodiment, the elastic support pieces 85g and the protrusions 85i are provided at four positions separated from each other by 90 degrees, but the number is not limited thereto, and the number may be three or more and provided at equal intervals.

In the above-described embodiment, the lubricating oil collected from the output gear 36a is sent to the oil reservoir 22d without providing an oil pump, but the lubricating oil sucked by the oil pump may be discharged and sent to the oil reservoir 22 d.

In the above-described embodiment, the in-wheel motor driving device was described as the motor driving device for a vehicle, but the present invention can also be applied to a motor driving device for a vehicle of an upper plate.

The present invention is not limited to the above-described embodiments at all, and can be carried out in various forms without departing from the scope of the present invention.

Description of the symbols

10: in-wheel motor driving device

20: outer casing

21: motor casing

22: reducer casing

22 a: motor side shell

22 b: outer plate side shell

22 d: oil storage part

25: motor rotating shaft

26: electric motor

30: input gear shaft

71 d: mounting hole for oil supply nozzle component

85: oil supply nozzle component

85 a: nozzle part

85 f: edge part

85 g: elastic support piece (elastic support)

85 i: a protrusion (elastic support).