JP5524940B2 - Mechanical and electric integrated drive - Google Patents

Description

  The present invention relates to an electromechanical integrated drive device.

  Patent Document 1 discloses a temperature sensor mounting structure in which a temperature sensor is disposed in a gap between coils of a stator to detect the surface temperature of the coil.

JP 2010-252508 A

In the electromechanical integrated drive device in which the motor and the control board are provided integrally, it is preferable not to provide a harness between the motor and the control board from the viewpoint of assembly of the temperature sensor. Since a harness for taking out a signal from the gap is required, there is a problem in that the assembling property is lowered.
An object of the present invention is to provide an electromechanical integrated drive device capable of improving the assembling property of a temperature sensor.

In order to achieve the above object, in the present invention, the sensor part of the temperature sensor is fixed to an insulator provided at one end of the stator in the axial direction , and the terminal part of the temperature sensor is fixed to the one axial side of the motor. Fixed to the placed control board.

  Therefore, the assembling property of the temperature sensor can be improved.

1 is a longitudinal sectional view of an electric oil pump 1 according to Embodiment 1. FIG. FIG. 3 is a rear perspective view of the stator 8 according to the first embodiment. FIG. 3 is an enlarged view of a main part of FIG. 2. 3 is a flowchart illustrating a flow of electric oil pump drive control processing according to the first embodiment.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the electromechanical integrated drive device of this invention is demonstrated based on the Example shown on drawing.
[Example 1]
FIG. 1 is a vertical cross-sectional view of an electric oil pump (mechanical and electric integrated drive device) 1 according to a first embodiment.
The electric oil pump 1 according to the first embodiment is a pump mounted for an automatic transmission of a vehicle having an idle stop function. This automatic transmission is a belt-type continuously variable transmission, and is separately provided with a main pump driven by an engine. When the engine is stopped by the idle stop control, the hydraulic pressure by the main pump cannot be secured, and if the hydraulic pressure decreases due to a frictional engagement element or a leak from the pulley in the belt type continuously variable transmission, Since it takes time to secure the operability, drivability is reduced. Therefore, in addition to the main pump, an electric oil pump 1 that can discharge hydraulic pressure regardless of the operating state of the engine is provided, and the engine restart and re-start are ensured by ensuring the hydraulic pressure corresponding to the leakage from the frictional engagement elements and pulleys. Improve driving performance at times.
The electric oil pump 1 is an electromechanical integrated electric oil pump in which an oil pump unit 2 and an inverter unit 3 are integrally provided.

[Configuration of oil pump unit 2]
The oil pump unit 2 includes a pump 6 including a pump rotor 4 having external teeth and an outer rotor 5 having internal teeth, a motor rotor (rotor) 7 connected to the pump rotor 4, and a motor including a stator 8. 9 and. The configuration of the stator 8 will be described later.
The pump 6 and the motor 9 are accommodated in one center housing 10. The center housing 10 is formed of a material having a higher thermal conductivity than a 100% resin material such as aluminum die casting. The center housing 10 has an opening at both ends toward the outer side in the axial direction (right side in FIG. 1), and has a cylindrical shape in which a pump element accommodating portion 11 for rotatably housing the outer rotor 5 is formed on the inner periphery of one opening. A pump housing portion 12 is formed, a stator housing 8 is fixedly supported in the inner periphery of the other opening, and a motor housing portion 13 for housing a motor rotor and the like is formed therein. A bracket 14 is formed for attachment to the automatic transmission.

Inside the center housing 10, a cylindrical support portion 16 that rotatably supports the rotor drive shaft 15, and the cylindrical support portion 16 is connected to the outer periphery of the center housing 10, and the pump housing portion 12 and the motor housing portion 13 It has the partition which defines a space. A seal member that supports the rotor drive shaft 15 at the inner periphery of the cylindrical support portion 16 and seals between the rotor drive shaft 15 and the inner periphery of the cylindrical support portion 16 at the end on the motor housing portion 13 side. 17 is provided.
The pump cover 18 includes a discharge port 19 that extends in a cylindrical shape that communicates with the discharge region of the pump element, and a suction port 20 that communicates with the suction region of the pump element. A seal ring groove 22 to which a seal ring 21 is attached is formed on the outer periphery of the distal end of the discharge port 19. The pump cover 18 is formed with bolt holes 23 at three locations in the circumferential direction, and is fastened and fixed to the bolt holes 24 formed in the center housing 10 by bolts 25.

[Configuration of inverter unit 3]
The inverter unit 3 includes an inverter housing 26, a substrate (control substrate) 27, and a heat sink 28.
The inverter housing 26 is in contact with the closing surface 29 that closes the motor housing portion 13, the cylindrical standing portion 30 that is erected from the closing surface 29 and inserted into the inner wall of the motor housing portion 13, and the flange surface of the bracket 14. And a flange surface 34 provided with a through hole 33 through which the bolt 32 penetrates while pressing the seal member 31. Thereby, the inside of the motor housing portion 13 is configured as a drying chamber, and the inside of the pump housing portion 12 and the outer periphery of the pump are configured as wet chambers.
The substrate 27 is accommodated in the inverter housing 26 and fastened together by a plurality of bolts 35. On the substrate 27, a power MOSFET 36, a CPU (not shown), and the like are surface-mounted, and a capacitor 37 and an inductor 38 are attached. A flat heat dissipation sheet 39 is provided between the substrate 27 and the heat sink 28 at a position corresponding to the power MOSFET 36.
The heat sink 28 is attached to the inverter housing 26 so as to close the inverter housing 26. The heat radiation sheet 39 and the heat sink 28 form a heat radiation path for radiating the heat generated by the power MOSFET 36 to the outside.
The inverter unit 3 converts a direct current supplied from a battery (not shown) via the connector 40 into an alternating current by switching the power MOSFET 36, and supplies the alternating current to the stator 8 of the motor 9 via the terminal 53. Although not shown in FIG. 1, the terminal 53 is bonded to the substrate 27.

The electric oil pump 1 according to the first embodiment is housed in a pump housing hole 42 formed in the housing 41 of the automatic transmission. A discharge passage 43 that supplies hydraulic pressure to a control valve unit (not shown) and a suction passage 44 that communicates with an oil suction port that opens in an oil pan (not shown) are opened in the pump accommodation hole 42. The pump accommodation hole 42 is provided at a position higher than the oil pan. The discharge passage 43 is formed with an enlarged diameter portion 45 facing the pump housing hole 42 in the discharge passage 43, and the discharge port 19 of the pump cover 18 is fitted and supported in the enlarged diameter portion 45. Has been. A seal ring 21 seals between the discharge channel 43 and the pump accommodation hole 42. The discharge flow path 43 and the discharge area of the pump element communicate with each other via a discharge port 46 formed in the discharge port 19.
The pump housing hole 42 is formed with a small-diameter opening 48 that communicates with the suction port 47 of the suction port 20 in a state where the center housing 10 of the electric oil pump 1 is housed, and has a larger diameter than the small-diameter opening 48. A large-diameter opening 49 having substantially the same inner diameter as the outermost diameter portion of the motor housing portion 13, and a tapered surface 50 formed on the outer opening edge of the housing 41 of the large-diameter opening 49. The taper surface 50 holds the seal ring 51 between the outer periphery of the motor housing portion 13.
A fluid accommodation chamber 52 is defined between the pump cover 18 and the center housing 10 and the pump accommodation hole 42. The fluid storage chamber 52 extends between the motor storage unit 13 and the large-diameter opening 49. A suction port 47 of the suction port 20 opens in the fluid storage chamber 52 and communicates with the suction flow path 44 via the fluid storage chamber 52.

[Configuration of Stator 8]
2 is a rear perspective view of the stator 8 according to the first embodiment, and FIG. 3 is an enlarged view of a main part of FIG.
The stator 8 includes a core 55 and a coil 56. The core 55 is formed by laminating silicon steel plates, and includes a cylindrical core body 55a and a plurality of teeth 55b protruding from the inner peripheral side of the core body 55a. The coil 56 is wound around the teeth 55b. The core body 55a is divided in the circumferential direction for each tooth 55b. A resin insulator 57 is attached to the back side of the core body 55a (the right side in FIG. 1) and each tooth 55b, and the electrical insulation between the core 55 and the coil 56 is maintained.
A temperature sensor 58 is fixed to the rear side end of the insulator 57. The temperature sensor 58 is for measuring the temperature of the coil 56 (coil temperature), and includes a sensor unit 59 and a terminal unit 60. The sensor unit 59 has an arcuate cross-sectional shape, and a sensor surface 59a is provided at the tip. The terminal unit 60 includes three terminals of a power source, a ground, and a signal, and outputs a signal output from the sensor unit 59 to the outside through a signal terminal. The tip of each terminal of the terminal portion 60 is fixed by soldering while being inserted into the substrate 27. The inverter housing 26 is formed with a through hole (not shown) through which each terminal of the terminal portion 60 passes.
The insulator 57 is provided with a groove 61 into which the sensor unit 59 is inserted from the sensor surface 59a side. The groove 61 is formed along the outer peripheral shape of the sensor unit 59 and restricts the movement of the sensor unit 59 in the radial direction (axial direction). The sensor portion 59 is fixed to the insulator 57 with an adhesive in a state where the sensor portion 59 is inserted into the groove 61 and the sensor surface 59a is in contact with the coil 56. The terminal unit 60 of the temperature sensor 58 is fixed to the substrate 27, and transmits the signal output from the sensor unit 59 to the CPU mounted on the substrate 27.

[Electric oil pump drive control processing]
FIG. 4 is a flowchart illustrating the flow of the electric oil pump drive control process according to the first embodiment. This flowchart is repeatedly executed at predetermined calculation cycles by the CPU mounted on the board 27.
In step S1, a command signal from a control unit that controls the electric oil pump 1 is input.
In step S2, the coil temperature T is input from the temperature sensor 58.
In step S3, it is determined whether or not the coil temperature T input in step S2 is larger than a preset heat-resistant set temperature Ts. If YES, the process proceeds to step S4, and if NO, the process proceeds to step S5. Here, the heat resistant set temperature Ts is, for example, the heat resistant limit temperature of the coil 56.
In step S4, electric power is supplied to the coil 56 in accordance with the command signal input in step S1, and the motor 9 is operated.
In step S5, energization of the coil 56 is stopped and the motor 9 is stopped.
In step S6, stop information of the motor 9 is transmitted to the control unit. When receiving the stop information of the motor 9, the control unit stops the idle stop control, starts the engine, and drives the main pump.

Next, the operation will be described.
[Motor protection]
In a conventional electric oil pump, the current value of the motor is controlled based on the oil temperature outside the pump (for example, oil pan). When the oil viscosity is very low, the current value is high for driving the pump. It is necessary to control with. However, when a current higher than usual is applied, an excessive temperature rise occurs in the coil, and the coil may exceed a heat resistance limit (heat resistance set temperature). When the coil exceeds the heat resistance limit, problems such as deterioration or disappearance of the pump function occur.
On the other hand, in the first embodiment, the coil temperature T of the coil 56 is monitored by the temperature sensor 58, and when the coil temperature T exceeds the heat resistant set temperature Ts, the power supply to the coil 56 is stopped. The temperature rise of the coil 56 exceeding can be suppressed. Therefore, the current flowing through the coil 56 can be limited before the performance of the coil 56 is deteriorated or burned out, and the coil 56 can be protected.
In addition, by prohibiting the motor 9 from operating at a temperature outside the function guarantee temperature, it is possible to suppress a decrease in controllability associated with the occurrence of pump discharge failure, etc., and to improve safety and reliability. it can.

[Assembly improvement]
In the first embodiment, the sensor portion 59 of the temperature sensor 58 is fixed to the insulator 57 provided on the back side of the stator 8, and the terminal portion 60 of the temperature sensor 58 is fixed to the substrate 27 disposed on the back side of the motor 9. did.
The configuration in which the terminal portion 60 of the temperature sensor 58 is directly fixed to the substrate 27 eliminates the need to connect the temperature sensor 58 and the substrate 27 with a harness, so that the assembly of the temperature sensor 58 can be improved. it can.
Further, the insulator 57 is provided with a groove 61 into which the sensor part 59 of the temperature sensor 58 is inserted, and the groove 61 is shaped to match the sensor part 59 of the temperature sensor 58, so that the temperature sensor 58 can be easily positioned and fixed. Yes, it is possible to improve the assembly. Further, since the groove 61 is provided so as to open to the coil side of the insulator 57, even if the thickness of the sensor portion 59 of the temperature sensor 58 protrudes to the coil side, it can be accommodated in the space above the coil.

Next, the effect will be described.
The electric oil pump 1 according to the first embodiment has the following effects.
(1) A motor / electrically integrated drive device including a motor 9 having a motor rotor 7 and a stator 8 and a substrate 27 that controls the amount of current supplied to the coil 56, and a temperature sensor 58 that detects the temperature of the coil 56. The substrate 27 is disposed on the back side of the motor 9, the temperature sensor 58 is composed of the sensor part 59 and the terminal part 60, and the sensor part 59 is attached to the insulator 57 provided on the back side end part of the stator 8. The terminal portion 60 was fixed to the substrate 27.
Since it is not necessary to connect the temperature sensor 58 and the substrate 27 with a harness, the assembly of the temperature sensor 58 can be improved.
(2) The insulator 57 is provided with a groove 61 into which the sensor unit 59 is inserted.
Since the groove 61 is shaped to match the sensor portion 59 of the temperature sensor 58, the temperature sensor 58 can be easily positioned and fixed, and the assemblability can be improved. Further, since the groove 61 is provided so as to open to the coil side of the insulator 57, even if the thickness of the sensor portion 59 of the temperature sensor 58 protrudes to the coil side, it can be accommodated in the space above the coil.

(Other examples)
As mentioned above, although the electromechanical integrated drive device of this invention was demonstrated based on the Example, the specific structure of this invention is not limited to the structure of an Example.
In the embodiment, the example in which the electromechanical integrated drive device is applied to the electric oil pump has been described. However, even when the drive device is applied to another drive device, the same operational effects as the embodiment can be obtained.

1 Electric oil pump
7 Motor rotor (rotor)
8 Stator
9 Motor
27 Board (control board)
56 coils
57 Insulator
58 Temperature sensor
59 Sensor section
60 Terminal
61 Groove

Claims (2)

In the electromechanical integrated drive device provided with a temperature sensor for detecting the temperature of the coil, which is integrally provided with a motor having a rotor and a stator and a control board for controlling the amount of current supplied to the coil of the stator,
The control board is arranged on one side in the axial direction of the motor,
The temperature sensor is composed of a sensor part and a terminal part,
An electro-mechanical integrated drive device, wherein the sensor portion is fixed to an insulator provided at one end portion in the axial direction of the stator, and the terminal portion is fixed to the control board. In the electromechanical integrated drive device according to claim 1,
An electro-mechanical integrated drive device characterized in that a groove for inserting the sensor portion is provided in the insulator.

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