阅读说明：本技术 逆变器单元 (Inverter unit ) 是由 岩上直记 堀内元气 于 2020-04-09 设计创作，主要内容包括：本发明提供逆变器单元,该逆变器单元的一个方式是与具有马达和辅机的马达单元连接的逆变器单元,其中,该逆变器单元具有：逆变器,其将高电压的直流电流转换成交流电流而提供给马达；控制部,其对逆变器进行控制；逆变器壳体,其收纳逆变器和控制部；高电压用的连接器部,其接收高电压的直流电流并提供给逆变器；第1连接器部,其连接有从外部电源延伸的第1线束；以及第2连接器部,其连接有从辅机延伸的第2线束。在第1连接器部中,从外部电源接收低电压的电力。在第2连接器部中,发送和接收与辅机之间的信号,并且向辅机提供驱动电力。(The present invention provides an inverter unit connected to a motor unit having a motor and an auxiliary device, the inverter unit including: an inverter that converts a high-voltage direct current into an alternating current and supplies the alternating current to a motor; a control unit that controls the inverter; an inverter case that houses the inverter and the control unit; a high-voltage connector unit that receives a high-voltage direct current and supplies the high-voltage direct current to the inverter; a 1 st connector part to which a 1 st wire harness extending from an external power supply is connected; and a 2 nd connector portion to which a 2 nd wire harness extending from the auxiliary is connected. In the 1 st connector section, low-voltage power is received from an external power supply. In the 2 nd connector section, signals with the auxiliary machine are transmitted and received, and drive power is supplied to the auxiliary machine.)

1. An inverter unit connected to a motor unit having a motor and an auxiliary machine,

the inverter unit includes:

an inverter that converts a high-voltage direct current into an alternating current and supplies the alternating current to the motor;

a control unit that controls the inverter;

an inverter case that houses the inverter and the control unit;

a high-voltage connector unit that receives a high-voltage direct current and supplies the high-voltage direct current to the inverter;

a 1 st connector part to which a 1 st wire harness extending from an external power supply is connected; and

a 2 nd connector portion to which a 2 nd wire harness extending from the auxiliary is connected,

in the 1 st connector section, receiving power of a low voltage from the external power supply,

in the 2 nd connector section, signals with the auxiliary machine are transmitted and received, and drive power is supplied to the auxiliary machine.

2. The inverter unit according to claim 1,

supplying a part of the low-voltage power received by the 1 st connector section to the control section.

3. The inverter unit according to claim 1 or 2, wherein,

the 1 st connector part and the 2 nd connector part each have:

a connector main body fixed to the inverter case and connecting the inside and outside of the inverter case;

a connector wiring drawn out from the connector main body to the inside of the inverter case; and

a connector relay terminal located at a front end of the connector wiring,

the 1 st connector part and the 2 nd connector part have connector relay terminals connected to each other to constitute a wiring relay part,

the inverter unit includes a holding portion for holding the wiring relay portion.

Technical Field

The present invention relates to an inverter unit.

Background

As the demand for hybrid vehicles and electric vehicles increases, the development of motor units for driving axles of vehicles is actively ongoing. The motor unit described in patent document 1 includes an electric pump for circulating oil in the unit.

Patent document 1: japanese patent laid-open No. 2014-47908

A power supply line extending from the power supply device and a signal line extending from the control device are connected to an auxiliary device (for example, an electric pump). Therefore, two wire harnesses through which a power supply line and a signal line pass are connected to the conventional electric pump. In addition, in the conventional electric pump, two connectors for connecting the respective harnesses are required, and therefore, the number of parts increases, and the assembly process is complicated.

Disclosure of Invention

An object of one embodiment of the present invention is to provide an inverter unit that can reduce the number of harnesses and simplify the assembly process.

One aspect of the present invention provides an inverter unit connected to a motor unit having a motor and an auxiliary device, the inverter unit including: an inverter that converts a high-voltage direct current into an alternating current and supplies the alternating current to the motor; a control unit that controls the inverter; an inverter case that houses the inverter and the control unit; a high-voltage connector unit that receives a high-voltage direct current and supplies the high-voltage direct current to the inverter; a 1 st connector part to which a 1 st wire harness extending from an external power supply is connected; and a 2 nd connector portion to which a 2 nd wire harness extending from the auxiliary is connected. In the 1 st connector portion, low-voltage power is received from the external power supply. In the 2 nd connector section, signals with the auxiliary machine are transmitted and received, and drive power is supplied to the auxiliary machine.

According to one embodiment of the present invention, an inverter unit is provided that can simplify an assembly process by reducing the number of wire harnesses.

Drawings

Fig. 1 is a conceptual diagram of a motor unit and an inverter unit according to an embodiment.

Fig. 2 is a plan view of an inverter unit according to an embodiment.

Description of the reference symbols

8: an inverter unit; 8 a: an inverter; 8 b: an inverter case; 8 c: a control unit; 10: a motor unit; 30: a motor; 60: a wire; 61: 1 st wire harness; 62: a 2 nd wire harness; 80: a high-voltage connector section; 81: a 1 st connector part; 81 a: 1 st connector body (connector body); 81 c: the 1 st pump is wired with a power supply (connector wiring); 81 d: a 1 st connector relay terminal (connector relay terminal); 82: a 2 nd connector portion; 82 a: a 2 nd connector body (connector body); 82 c: the 2 nd pump is wired with power (connector wiring); 82 d: a 2 nd connector relay terminal (connector relay terminal); 83: a wiring relay section; 84: a hook portion (holding portion); 97: an electric pump (auxiliary machine).

Detailed Description

Hereinafter, the motor unit 10 and the inverter unit 8 according to the embodiment of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and may be arbitrarily changed within the scope of the technical idea of the present invention. In the drawings below, in order to facilitate understanding of each structure, the actual structure may be different from the scale, the number, or the like of each structure.

Fig. 1 is a conceptual diagram of a motor unit 10 according to an embodiment. Fig. 2 is a plan view of the inverter unit 8 according to the embodiment.

The motor axis J1, the sub axis J3, and the output axis J4, which will be described later, are imaginary axes that do not actually exist.

< Motor Unit >

The motor unit 10 is mounted on a vehicle, and drives the vehicle by rotating wheels. The motor unit 10 is mounted on, for example, an Electric Vehicle (EV). The motor unit 10 may be mounted on a vehicle having a motor as a power source, such as a Hybrid Electric Vehicle (HEV) or a plug-in hybrid electric vehicle (PHV).

As shown in fig. 1, the motor unit 10 has a motor 30, a transmission mechanism (transaxle) 5, a housing 6, an electric pump (auxiliary machine) 97, an oil cooler 96, oil O, a 1 st wire harness 61, a 2 nd wire harness 62, and a 3 rd wire harness 63. Further, the inverter unit 8 is connected to the motor unit 10.

In the present specification, the wire harness refers to a member obtained by wiring devices in a bundle. One wire harness has two or more wires bundled. The wire harness constitutes a part of the signal line or the power supply line. Here, the signal line refers to a wiring path for transmitting a signal, and the power supply line refers to a wiring path for driving a driving object.

The motor 30 is a motor generator having both a function as an electric motor and a function as a generator. The motor 30 mainly functions as an electric motor to drive the vehicle, and functions as a generator during regeneration.

The motor 30 has a rotor 31 and a stator 32 surrounding the rotor 31. The rotor 31 is rotatable about a motor axis J1. The rotor 31 is fixed to a motor drive shaft 11 described later. The rotor 31 rotates about a motor axis J1.

The motor 30 is connected to the inverter 8 a. The inverter 8a converts a direct current supplied from a battery, not shown, into an alternating current and supplies the alternating current to the motor 30. The respective rotation speeds of the motor 30 are controlled by controlling the inverter 8 a.

A temperature sensor (sensor) 38 and a rotation angle sensor (sensor) 39 are mounted on the motor 30. That is, the motor unit 10 includes a temperature sensor 38 and a rotation angle sensor 39 as sensors for measuring the state of the motor 30.

The temperature sensor 38 measures the temperature of the motor 30. A temperature sensor 38 is mounted to the coil end of the stator 32. Therefore, the temperature sensor 38 outputs the temperature of the coil as the temperature of the motor 30.

The rotation angle sensor 39 measures the rotation angle of the motor 30. More specifically, the rotation angle sensor 39 detects the relative rotation angle of the rotor 31 with respect to the stator 32. The rotation angle sensor 39 of the present embodiment is a resolver having a resolver rotor fixed to the rotor 31 and a resolver stator fixed to an inner wall surface of the housing 6.

The motor 30 has a motor connector portion 30 a. The housing 6 is through-penetrating inside and outside. The motor connector portion 30a is connected to a temperature sensor 38 and a rotation angle sensor 39 inside the housing 6. The motor connector portion 30a is connected to a connector terminal 63b provided at an end of the 3 rd wire harness 63 outside the housing 6.

In this specification, the connector terminal refers to an aggregate terminal inserted into the connector portion. The connector terminal is provided at an end of the wire harness. The connector terminal has a plurality of metal pins corresponding to the respective wires of the wire harness. The plurality of pins of the connector terminal are connected to respective metal pins provided in the connector section.

The transmission mechanism 5 transmits the power of the motor 30 and outputs the power from the output shaft 55. The transmission mechanism 5 incorporates a plurality of mechanisms that are responsible for power transmission between the drive source and the driven device.

The transmission mechanism 5 includes a motor drive shaft 11, a motor drive gear 21, a counter shaft 13, a pinion gear (large gear portion) 23, a drive gear (small gear portion) 24, a ring gear 51, an output shaft (axle) 55, and a differential device (differential gear) 50.

The motor drive shaft 11 extends along a motor axis J1. The motor drive shaft 11 rotates the motor 30. A motor drive gear 21 is fixed to the motor drive shaft 11. The motor drive gear 21 meshes with the pinion gear 23.

The pinion 23 extends along a pinion axis J3 and is fixed to the counter shaft 13. A drive gear 24 is fixed to the counter shaft 13 in addition to the counter gear 23. The drive gear 24 meshes with the ring gear 51.

The ring gear 51 is fixed to the differential device 50. The ring gear 51 rotates about the output axis J4. The ring gear 51 transmits the power of the motor 30 transmitted via the drive gear 24 to the differential device 50.

The differential device 50 is a device for transmitting torque output from the motor 30 to wheels of the vehicle. The differential device 50 is connected to a pair of output shafts 55. Wheels are mounted on the pair of output shafts 55, respectively. The differential device 50 has the following functions: when the vehicle turns, the same torque is transmitted to the pair of output shafts 55 while absorbing the speed difference between the left and right wheels.

The housing 6 houses the motor 30 and the transmission mechanism 5. The interior of the housing 6 is divided into a motor chamber 6A that houses the motor 30 and a gear chamber 6B that houses the transmission mechanism 5.

The oil O is accumulated inside the casing 6. The oil O circulates through an oil passage 90 provided in the casing 6. The oil O is used for lubrication of the transmission mechanism 5 and for cooling of the motor 30. The oil O is accumulated in a lower region of the gear chamber 6B (i.e., the oil reservoir P). A part of the transmission mechanism 5 is immersed in the oil O in the oil reservoir P. The oil O accumulated in the oil reservoir P is lifted by the operation of the transmission mechanism 5 and diffused into the gear chamber 6B. The oil O diffused into the gear chamber 6B is supplied to each gear of the transmission mechanism 5 in the gear chamber 6B so that the oil O spreads over the tooth surfaces of the gears.

The oil passage 90 is provided in the housing 6. The oil passage 90 is formed across the motor chamber 6A and the gear chamber 6B. The oil passage 90 is provided with an electric pump 97 and an oil cooler 96. In the oil passage 90, the oil O circulates in the order of the oil reservoir P, the electric pump 97, the oil cooler 96, and the motor 30 and returns to the oil reservoir P.

The electric pump 97 is provided as an auxiliary device in the motor unit 10. The electric pump 97 is provided in the path of the oil passage 90 and pumps the oil O. The electric pump 97 is a pump driven by electricity. The electric pump 97 sucks up the oil O from the oil reservoir P. The electric pump 97 supplies the sucked oil O to the motor 30 via the oil cooler 96. The electric pump 97 has a pump connector portion 97 a. The 2 nd connector terminal 62b provided at the end of the 2 nd wire harness 62 is connected to the pump connector portion 97 a.

The oil cooler 96 is provided in a path of the oil passage 90, and cools the oil O passing through the oil passage 90. That is, the oil cooler 96 cools the oil O supplied to the motor 30. The oil cooler 96 is fixed to the housing 6.

The oil O passing through the oil cooler 96 is supplied to the motor 30 above the motor chamber 6A via a flow path provided in the housing 6. The oil O supplied to the motor 30 flows along the outer peripheral surface of the motor 30 and the coil surface of the stator 32 from the upper side to the lower side, and carries away heat of the motor 30. This enables cooling of the entire motor 30. The oil O having cooled the motor 30 drops downward and is accumulated in the lower region in the motor chamber 6A. The oil O accumulated in the lower region of the motor chamber 6A moves to the gear chamber 6B through an opening not shown.

< inverter unit >

The inverter unit 8 is connected to the motor unit 10. The inverter unit 8 includes an inverter 8a, a control unit 8c that controls the inverter 8a and the electric pump 97, an inverter case 8b that houses the inverter 8a and the control unit 8c, a high-voltage connector unit (hereinafter, referred to as a high-voltage connector unit) 80, a 1 st connector unit 81, and a 2 nd connector unit 82. The inverter unit 8 is fixed to an outer surface of the case 6 in the inverter case 8 b.

The high-voltage connector portion 80, the 1 st connector portion 81, and the 2 nd connector portion 82 are fixed to the inverter case 8 b. The high-voltage connector portion 80, the 1 st connector portion 81, and the 2 nd connector portion 82 penetrate the inside and outside of the inverter case 8 b.

The high-voltage connector portion 80 is connected to the inverter 8a inside the inverter unit 8. The high-voltage connector portion 80 is connected to a line 60 extending from a high-voltage battery mounted on the vehicle outside the inverter unit 8. That is, the high-voltage connector portion 80 receives a high-voltage dc current from the line 60 and supplies the dc current to the inverter 8 a. The voltage of the power supplied from the line 60 is about 300V to 400V. In the present specification, the "high voltage" refers to a voltage of electric power for driving the motor 30. In the present specification, the "low voltage" is a voltage lower than the high voltage, and refers to a voltage of electric power for driving the control unit 8c and the electric pump 97.

The 1 st connector portion 81 is connected to the control portion 8c inside the inverter unit 8. In addition, the 1 st connector portion 81 is connected to the 1 st wire harness 61 extending from the external power supply outside the inverter unit 8.

As shown in fig. 2, the 1 st connector part 81 includes a 1 st connector main body (connector main body) 81a, a control-part power supply wiring 81b, a 1 st-pump power supply wiring (connector wiring) 81c, and a 1 st-connector relay terminal (connector relay terminal) 81 d. The 1 st connector body 81a is fixed to the inverter case 8b, and connects the inside and outside of the inverter case 8 b. The control-unit power supply wire 81b and the 1 st-pump power supply wire 81c are led out from the 1 st connector body 81a into the inverter case 8 b. The end of the control-unit power supply wiring 81b is connected to the circuit board of the control unit 8 c. A 1 st connector relay terminal 81d is provided at an end of the 1 st pump power supply line 81 c.

As shown in fig. 1, the 2 nd connector portion 82 is connected to the control portion 8c inside the inverter unit 8. In addition, the 2 nd connector portion 82 is connected to the 2 nd wire harness 62 extending from the electric pump 97 and the 3 rd wire harness 63 extending from the motor 30 outside the inverter unit 8.

As shown in fig. 2, the 2 nd connector portion 82 has a 2 nd connector main body (connector main body) 82a, a pump control wiring 82b, a 2 nd pump power supply wiring (connector wiring) 82c, and a 2 nd connector relay terminal (connector relay terminal) 82 d. The 2 nd connector main body 82a is fixed to the inverter case 8b, and connects the inside and outside of the inverter case 8 b. The pump control wiring 82b and the 2 nd pump power supply wiring 82c are led out from the 2 nd connector main body 82a to the inside of the inverter case 8 b. An end of the pump control wiring 82b is connected to a circuit board of the control unit 8 c. A 2 nd connector relay terminal 82d is provided at an end of the 2 nd pump power supply line 82 c.

The 1 st connector relay terminal 81d and the 2 nd connector relay terminal 82d are connected to each other to constitute a wiring relay 83. That is, the connector relay terminals of the 1 st connector portion 81 and the 2 nd connector portion 82 are connected to each other to constitute the wiring relay portion 83. A hook portion (holding portion) 84 protruding sideward is provided on a side surface of the inverter 8a described later. The hook portion 84 holds the wiring relay portion 83.

The wiring relay section 83 configured by connecting the 1 st connector relay terminal 81d and the 2 nd connector relay terminal 82d to each other is a heavy object provided in a path of the wiring. Therefore, the wiring relay section 83 may be damaged by collision with another member due to vibration or the like. According to the present embodiment, since the inverter unit 8 has the hook portion 84 that holds the wiring relay portion 83, even if vibration is applied to the inverter unit 8, the wiring relay portion 83 can be suppressed from colliding with another member.

The inverter 8a converts the high-voltage direct current supplied from the line 60 into alternating current. The inverter 8a is connected to the motor 30 via a bus bar 8 e. The inverter 8a supplies the converted alternating current to the motor 30 via the bus bar 8 e.

The 1 st wire harness 61 connects an external power supply, not shown, to the inverter unit 8. The external power supply is a low voltage (e.g., 12V) power supply. The end of the 1 st wire harness 61 is bundled by a connector terminal 61 a. The 1 st wire harness 61 is connected to the 1 st connector portion 81 of the inverter unit 8 at the connector terminal 61 a.

The 1 st wire harness 61 is passed through by a low voltage power supply line 71. The low-voltage power supply line 71 is a line for transmitting low-voltage electric power from an external power supply to the control unit 8c and the electric pump 97. The low-voltage power supply line 71 branches into a control section power supply line 71a and a pump power supply line 71b at a branch point 71 c. In addition, the voltage of the power supplied from the low voltage power supply line 71 through the 1 st wire harness 61 is about 12V.

The branch point 71c of the low-voltage power supply line 71 is located outside the inverter unit 8 with respect to the 1 st connector portion 81. The connector terminal 61a of the 1 st wire harness 61 and the 1 st connector portion 81 are electrically connected to each other by connection of pins in a male-female relationship. Since the low-voltage power supply line 71 passes through the 1 st connector portion 81 in a state of being branched into the control unit power supply line 71a and the pump power supply line 71b, the control unit power supply line 71a and the pump power supply line 71b pass through different pins from each other. As a result, the current value flowing through one pin can be suppressed, and heat generation of the pin can be suppressed.

In addition, the branch point 71c may be located inside the inverter unit 8. In this case, in order to suppress heat generation of the lead, it is preferable to use a lead for a large current having a large cross-sectional area as a lead through which the low-voltage power supply line 71 passes.

The control unit power supply line 71a supplies driving power to the control unit 8 c. The control unit power supply line 71a extends from the branch point 71c to the inside of the inverter unit 8 via the 1 st connector portion 81, and is connected to the control unit 8 c. That is, a part of the low-voltage power received by the 1 st connector portion 81 is supplied to the control portion 8 c. The control unit power supply line 71a passes through a control unit power supply wiring 81b shown in fig. 2 inside the inverter unit 8.

The pump power supply line 71b supplies drive power to the electric pump 97. The pump power supply line 71b extends from the branch point 71c to the inside of the inverter unit 8 through the 1 st connector portion 81, and is connected from the 2 nd connector portion 82 to the electric pump 97 through the 2 nd wire harness 62. The pump power supply line 71b passes through a 1 st pump power supply line 81c and a 2 nd pump power supply line 82c shown in fig. 2 inside the inverter unit 8.

The 2 nd wire harness 62 connects the electric pump 97 and the inverter unit 8. One end of the 2 nd wire harness 62 is bundled by the 1 st connector terminal 62a, and the other end is bundled by the 2 nd connector terminal 62 b. The 1 st connector terminal 62a bundles not only the 2 nd wire harness 62 but also the end of the 3 rd wire harness 63. That is, the end of the 2 nd wire harness 62 and the end of the 3 rd wire harness 63 are collectively bundled by the 1 st connector terminal 62 a. The 1 st connector terminal 62a is connected to the 1 st connector portion 81 of the inverter unit 8. The 2 nd connector terminal 62b is connected to the pump connector portion 97 a.

The 2 nd wire harness 62 passes through a pump power supply line 71b and a pump signal line 72. The pump signal line 72 transmits a signal between the control unit 8c and the electric pump 97. The pump signal line 72 transmits a signal instructing the electric pump 97 to drive, which is sent from the control unit 8c, to the electric pump 97. The pump signal line 72 transmits the driving state of the electric pump 97 from the electric pump 97 to the control unit 8 c. The pump signal line 72 passes through a pump control wiring 82b shown in fig. 2 inside the inverter unit 8.

According to the present embodiment, the inverter unit 8 receives low-voltage power from an external power supply (not shown) in the 1 st connector portion 81. In addition, the inverter unit 8 transmits and receives signals with the electric pump 97 in the 2 nd connector section 82, and supplies driving power to the electric pump 97. That is, the pump power supply line 71b driven by the electric pump 97 and the pump signal line 72 transmitting a signal of the electric pump 97 are passed through the 2 nd harness 62. Therefore, compared to a case where the power supply line and the signal line are respectively led out to the electric pump 97 from the external power supply (not shown) and the inverter unit 8, the route of the wire harness can be simplified, and the assembly process can be simplified.

The 3 rd wire harness 63 connects the motor 30 and the inverter unit 8. One end of the 3 rd wire harness 63 is bundled together with an end of the 2 nd wire harness 62 by the 1 st connector terminal 62 a. In addition, the other end of the 3 rd wire harness 63 is bundled by the connector terminal 63 b. The connector terminal 63b is connected to the motor connector section 30 a.

The 3 rd harness 63 is passed through a temperature sensor signal line (sensor signal line) 73 and a rotation angle sensor signal line (sensor signal line) 74. The temperature sensor signal line 73 transmits a signal between the control unit 8c and the temperature sensor 38. The signal transmitted by the temperature sensor signal line 73 contains information on the temperature of the motor 30 measured by the temperature sensor 38. Similarly, the rotation angle sensor signal line 74 transmits a signal between the control unit 8c and the rotation angle sensor 39. The signal transmitted by the rotation angle sensor signal line 74 includes information of the rotation angle of the motor 30 measured by the rotation angle sensor 39.

According to the present embodiment, the 2 nd wire harness 62 and the 3 rd wire harness 63 are bundled and connected to the 2 nd connector portion 82. Therefore, in the inverter unit 8, the pump power supply line 71b, the pump signal line 72, and the sensor signal lines 73 and 74 are connected to the 2 nd connector portion 82. Therefore, the inverter unit 8 can reduce the number of connector portions as compared with the case where the connector portions are provided for each line. As a result, the assembly process of the motor unit 10 can be simplified.

While the embodiment and the modification of the present invention have been described above, the configurations and combinations thereof in the embodiment and the modification are merely examples, and addition, omission, replacement, and other modifications of the configurations may be made without departing from the scope of the present invention. The present invention is not limited to the embodiments.

For example, in the above embodiment, the electric pump 97 is described as an auxiliary machine. However, the auxiliary machine controlled by the inverter unit 8 may have another function. For example, the auxiliary machine controlled by the inverter unit 8 may be an electric actuator that drives the parking lock mechanism.