Motor unit

Abstract

This provides a new technology for installing a temperature sensor in a motor unit. [Solution] The motor unit comprises a motor, a housing for housing the motor, a pipe provided within the housing for supplying oil to the motor, and a temperature sensor for measuring the temperature of the oil. The inner surface of the pipe is provided with a recess where the oil flowing through the pipe accumulates, and the temperature sensor is positioned within the recess.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a motor unit.

Background Art

[0002] Patent Document 1 discloses a motor unit including a motor and a housing that houses the motor. An oil passage for supplying oil to the motor is provided on the inner wall of the housing. A temperature sensor for measuring the temperature of the oil is disposed in the oil passage.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technology of Patent Document 1, the oil passage is formed on the inner wall of the housing, and the processing of the inner wall of the housing is complicated. Further, when a temperature sensor is disposed in the oil passage, new processing for providing a hole or the like for disposing the temperature sensor is required. The processing of the inner wall of the housing becomes even more complicated. This specification provides a new technology for providing a temperature sensor in a motor unit.

Means for Solving the Problems

[0005] The motor unit disclosed in this specification includes a motor, a housing that houses the motor, a pipe provided in the housing for supplying oil to the motor, and a temperature sensor for measuring the temperature of the oil. A recess in which the oil flowing in the pipe accumulates is provided on the inner surface of the pipe, and the temperature sensor is disposed in the recess.

[0006] According to the above configuration, the oil flow path is realized by a pipe rather than the inner wall of the housing. Since the oil flow path is not provided on the inner wall of the housing, the processing of the inner wall of the housing is simplified. Furthermore, since the temperature sensor is placed in a recess provided on the inner surface of the pipe, it is unnecessary to process the inner wall of the housing to accommodate the temperature sensor. As a result, the temperature sensor can be installed in the motor unit without complicating the processing of the inner wall of the housing. [Brief explanation of the drawing]

[0007] [Figure 1] This is a cross-sectional view of the motor unit. [Figure 2] This is a cross-sectional view along line II-II in Figure 1. [Figure 3] This is a perspective view of a pipe. [Modes for carrying out the invention]

[0008] Figures 1 and 2 show the configuration of the motor unit 10. The motor unit 10 is mounted on a vehicle, for example. The vehicle may be an electric vehicle, a hybrid vehicle, or a gasoline vehicle.

[0009] As shown in Figure 1, the motor unit 10 comprises a motor 2, a housing 4, a pipe 6, and a terminal block 8. The motor 2 is a three-phase AC motor, and it drives the drive wheels of the vehicle, for example, the front wheels. The housing 4 houses the motor 2. The material of the housing 4 is, for example, aluminum.

[0010] Pipe 6 is located inside the housing. Pipe 6 supplies oil to motor 2. The material of pipe 6 is, for example, resin.

[0011] Terminal block 8 is provided on the outer wall of housing 4. Motor terminals 82A, provided on power lines 82 extending from motor 2, are detachably connected to terminal block 8. Terminal block 8 has busbars, one end of which is exposed inside housing 4, and the other end of which is exposed outside housing 4. Motor terminals 82A are connected to one end of the busbar, and power lines extending from a power conversion device such as an inverter are connected to the other end of the busbar. Terminal block 8 transmits power from the power conversion device to motor 2.

[0012] As shown in Figure 2, the motor 2 has a stator 20 fixed to a housing 4 and a rotor 22 rotatably supported relative to the housing 4. The stator 20 has a stator core 20A and stator coils 20B provided on the stator core 20A. The stator coils 20B have coil end portions 20C that protrude from both end faces in the axial direction parallel to the rotation axis of the rotor 22.

[0013] The pipe 6 extends between the outer surface of the stator 20 and the inner surface of the housing 4, along an axial direction parallel to the rotation axis of the rotor 22. One end of the pipe 6 in the axial direction is closed, and the other end of the pipe 6 in the axial direction is provided with a supply port 6A. The supply port 6A communicates with an oil pump located outside the housing 4. Oil is supplied from the oil pump into the pipe 6 through the supply port 6A.

[0014] The pipe 6 further has injection ports 6B that spray oil toward the coil end portions 20C of the motor 2. The pipe 6 has two injection ports 6B. One of the two injection ports 6B faces one of the two coil end portions 20C, and the other of the two injection ports 6B faces the other of the two coil end portions 20C. Note that there may be only one injection port 6B. In addition to the injection ports 6B, the pipe 6 may also have other injection ports that spray oil toward the outer surface of the stator 20 of the motor 2. The oil sprayed from the injection ports 6B cools the coil end portions 20C.

[0015] The inner surface of the pipe 6 is provided with a recess 60 in which oil flowing through the pipe 6 accumulates. A temperature sensor 62 is positioned in the recess 60 to measure the temperature of the oil flowing through the pipe. For example, a protrusion is provided on the inner surface of the recess 60 that projects inward from the recess 60, and the tip of the temperature sensor 62 is embedded in the protrusion. This ensures that the tip of the temperature sensor 62 is positioned inside the recess 60.

[0016] As shown in Figures 2 and 3, the pipe 6 is provided with a fixing portion 64 for securing the pipe 6 inside the housing 4. The fixing portion 64 has, for example, a through hole, and the pipe 6 is secured inside the housing 4 by fastening a bolt that passes through the through hole to the housing 4.

[0017] Furthermore, as shown in Figure 1, a signal terminal 84A provided on a signal line 84 extending from the temperature sensor 62 is detachably connected to the terminal block 8. The terminal block 8 has a signal path, one end of which is exposed inside the housing 4, and the other end of which is exposed outside the housing 4. The signal terminal 84A is connected to one end of the signal path, and the other end of which is connected to a signal line extending from the control device. The control device controls, for example, a power converter, an oil pump, etc. The terminal block 8 transmits the signal from the temperature sensor 62 to the control device.

[0018] In this embodiment, the oil flow path is realized by the pipe 6. Furthermore, the temperature sensor 62 is placed in a recess 60 of the pipe 6, and the temperature sensor 62 and the pipe 6 are integrated. The temperature sensor 62 can be installed in the motor unit 10 simply by fixing the pipe 6 to the housing 4. Moreover, since the oil flow path is realized by the pipe 6, there is no need to process the inner wall of the housing 4 to realize the oil flow path. Also, since the temperature sensor 62 and the pipe 6 are integrated, there is no need to process the inner wall of the housing 4 to attach the temperature sensor 62. Compared to the comparative example in which the inner wall of the housing 4 is processed to realize the oil flow path, the processing of the inner wall of the housing 4 can be simplified.

[0019] (Correspondence) The motor unit 10 is an example of a "motor unit". The motor 2, the housing 4, the pipe 6, and the temperature sensor 62 are examples of a "motor", a "housing", a "pipe", and a "temperature sensor", respectively. The recess 60 is an example of a "recess". The stator 20 and the rotor 22 are examples of a "stator" and a "rotor", respectively. The stator core 20A, the stator coil 20B, and the coil end portion 20C are examples of a "stator core", a "stator coil", and a "coil end portion", respectively. The terminal block 8, the power line 82, and the motor terminal 82A are examples of a "terminal block", a "power line", and a "motor terminal", respectively. The signal line 84 and the signal terminal 84A are examples of a "signal line" and a "signal terminal", respectively.

[0020] Hereinafter, points to note regarding the technology shown in the embodiments will be described. The pipe 6 may extend along a direction intersecting the axial direction parallel to the rotation axis of the rotor 22.

[0021] Also, the pipe 6 may not have the injection port 6B and may have another injection port that injects oil toward the outer surface of the stator 20.

[0022] Also, the motor unit 10 may not include the terminal block 8. In this modification, for example, the control device may be provided in the housing 4, and the signal terminal 84A of the signal line 84 may be directly connected to the control device.

Description of Reference Numerals

[0023] 2: motor, 4: housing, 6: pipe, 6A: supply port, 6B: injection port, 8: terminal block, 10: motor unit, 20: stator, 20A: stator core, 20B: stator coil, 20C: coil end portion, 22: rotor, 60: recess, 62: temperature sensor, 64: fixing portion, 82: power line, 82A: motor terminal, 84: signal line, 84A: signal terminal

Claims

1. Motor and, A housing for the motor, A pipe provided within the housing for supplying oil to the motor, A temperature sensor for measuring the temperature of the oil, Equipped with, The inner surface of the pipe is provided with a recess in which the oil flowing inside the pipe accumulates. The temperature sensor is located within the recess. Motor unit.

2. The motor has a stator fixed to the housing and a rotor rotatably supported relative to the housing. The motor unit according to claim 1, wherein the pipe extends between the outer surface of the stator and the inner surface of the housing along an axial direction parallel to the rotation axis of the rotor.

3. The stator comprises a stator core and stator coils provided on the stator core. The stator coil has a coil end portion that protrudes from one end face in the axial direction of the stator coil, The motor unit according to claim 2, wherein the pipe has an injection port for injecting the oil toward the coil end portion.

4. The housing further comprises a terminal block, The motor unit according to any one of claims 1 to 3, wherein the terminal block is detachably connected to a motor terminal provided on a power line extending from the motor and a signal terminal provided on a signal line extending from the temperature sensor.

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