JP5915082B2 - Electric oil pump device - Google Patents

Description

  The present invention relates to an electric oil pump device.

  Conventionally, a specific example of the electric oil pump device includes a combination of an oil pump that circulates fluid (oil) and an electric motor that drives the oil pump. In addition, an electric oil pump device has been proposed in which an electric motor is provided adjacent to the pump housing, and a controller for motor control is arranged adjacent to the electric motor in the central axis direction with respect to the oil pump (for example, Patent Documents). 1).

  In such an electric oil pump device, the oil pump, the electric motor, and the controller are arranged side by side in the central axis direction of the oil pump, and the control board of the controller on which the electronic components are mounted is integrated in the housing that houses the electric motor. It is attached. However, since the control board is attached to the resin insulator forming the stator, the power supply ground portion of the control board is not directly connected to the metal member of the oil pump or the electric motor.

JP 2010-116914 A

  For this reason, when noise from the outside enters the control board through the resin housing member of the electric motor, or noise generated at the control board passes through the resin housing member and is released to the outside, the noise is absorbed and shielded. It may not be possible. As a result, the operation of the motor control circuit unit may become unstable due to the influence of noise from the outside, or conversely, the motor may be adversely affected by noise. The same applies to the case where the control board is attached to the resin member of the housing.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an electric oil pump device that can stably operate while suppressing adverse effects caused by noise in and out of the motor control circuit unit. .

In order to solve the above-described problem, the invention according to claim 1 is provided with an oil pump, an electric motor provided adjacent to the oil pump, for rotating the oil pump, and provided adjacent to the electric motor. It is, in the electric oil pump apparatus provided with a controller for driving and controlling the electric motor, and the pump housing of the oil pump, a fixed member before SL composed of a cylindrical metal member periphery was fixed electric motor stator are one arranged bearing for supporting the rotary shaft of the rotor before Symbol electric motor, a holding member of linked metal member to the pump housing, with the inner circumference of the end face projecting portion of the pump housing wherein the outer periphery of one axial end of the fixing member is fitted, it is fitted with the outer periphery of the inner peripheral and the holding member of the other axial end of the stationary member and, Serial holding member has a fastening portion for fixing the control board of the controller to the end face, and the fastening portion and the ground portion provided in the control board is fixed in the contact state, the earth portion and gist Rukoto that having a path formed electrically connected to said pump housing from.

  According to the above configuration, in the electric oil pump device in which the electric motor and the controller are arranged adjacent to the oil pump in the central axis direction with respect to the oil pump, the cylinder that fixes the pump housing and the stator of the electric motor. The metal-shaped fixing member and the metal holding member that supports the bearing disposed on one side of the rotor are connected to each other. A fastening portion for fixing the control board of the controller is provided on the end face of the holding member, abuts against the ground portion of the control board, and is electrically grounded. As a result, even if noise enters the control board from the outside through the resin housing member of the electric motor, or noise occurs on the control board, it is electrically grounded through the conduction path to the grounding part of the control board and the pump housing. Since it is connected, noise is absorbed or shielded. As a result, the control circuit on the control board of the controller can operate stably while suppressing the influence of noise.

Invention according to claim 2, in the electric oil pump apparatus according to claim 1, wherein the pump housing has a through-hole is provided penetrating in the thickness direction on the flange portion projecting from an outer peripheral end portion, the The gist is to have an insulating member that is inserted into the through hole and electrically insulates the attached portion and the flange portion with a gap .

According to the above configuration, in order to fix the pump housing to the attached portion to which the electric oil pump device is attached by the bolt, the through hole is provided in the plate thickness direction in the flange portion that protrudes from the outer peripheral end portion of the pump housing. The insulating member is inserted into the through hole. Thereby, since the to-be-attached part and the electric oil pump apparatus are electrically insulated, it becomes possible to earth | ground (earth connection) by an electric oil pump apparatus single-piece | unit. As a result, the control circuit on the control board of the controller can prevent adverse effects due to external noise as much as possible.

  ADVANTAGE OF THE INVENTION According to this invention, the electric oil pump apparatus which suppresses the bad influence by the noise to the inside and outside of a motor control circuit part and can operate | move stably can be provided.

1 is an axial sectional view showing a schematic configuration of an electric oil pump device according to an embodiment of the present invention. The schematic sectional drawing which shows the connection state of the earth | ground path | route in FIG. The front view seen from the arrow A direction in FIG.

Hereinafter , an electric oil pump device according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an axial sectional view showing a schematic configuration of an electric oil pump device according to an embodiment of the present invention. As shown in FIG. 1, an electric oil pump device 1 is used as a hydraulic pump for an automobile transmission, and an oil pump (for example, an internal gear pump) 2 and an electric motor (hereinafter referred to as a brushless motor) that drives the oil pump 2 to rotate. ) 3 are adjacent (unitized). The controller 4 is also incorporated in the motor housing 26. Incidentally, the brushless motor 3 shown in FIG. 1 is a brushless Sumo over data having the three-phase windings.

  The oil pump 2 uses a trochoid curved pump here, and a pump (not shown) having external teeth on the inner peripheral side of a pump outer rotor (not shown) having internal teeth having a trochoidal tooth profile (hereinafter referred to as an outer rotor). The inner rotor (hereinafter referred to as the inner rotor) is engaged, and the pump portion 16 is configured such that the outer rotor and the inner rotor are eccentrically arranged in the pump housing 15 so as to be rotatable.

  The inner rotor is fitted and fixed to a portion of the rotary drive shaft 7 that is closer to one side than the portion where the rotor 6 is formed, and rotates together with the rotary drive shaft 7. The outer rotor has one more inner tooth than the outer teeth of the inner rotor, and is arranged so as to be rotatable in the pump housing 15 around a position eccentric with respect to the rotational drive shaft 7. The inner rotor is configured such that the outer teeth mesh with the inner teeth of the outer rotor at a part of the entire circumference, and the outer teeth rotate while being substantially inscribed at the inner surface of the outer rotor at various locations on the entire circumference.

  Therefore, when the rotational drive shaft 7 is rotationally driven by the brushless motor 3, the volume of the gap between the outer rotor and the inner rotor of the oil pump 2 repeatedly expands and contracts during one rotation of the rotational drive shaft 7. A pump operation for sending oil from an import (not shown) provided on the pump plate 14 leading to the gap toward the out port is performed.

  The brushless motor 3 includes a rotating motor rotor (hereinafter referred to as “rotor”) 6 and a motor stator (hereinafter referred to as “stator”) 5 fixed to the outside of the outer peripheral surface of the rotor 6. The rotor 6 is formed by, for example, arranging a plurality of permanent magnets (not shown) side by side along the circumferential direction on the outer peripheral surface of the rotary drive shaft 7. The rotation drive shaft 7 is a rotation shaft shared by the brushless motor 3 and the oil pump 2, and both ends thereof are rotatably supported by bearings 11 and 12 inside the pump housing 15 and the holding member 17. Here, the stator 5 of the brushless motor 3 is fixed by screwing a plurality of bolts 21 inserted from the through holes of the holding member 17 to the pump housing 15. In the present embodiment, the three bolts 21 are arranged at equal intervals in the circumferential direction with respect to the axial center.

  In the stator 5, a plurality of inwardly-illustrated teeth of the stator core 9 are arranged outside the outer peripheral surface of the rotor 6 through a slight air gap. A three-phase coil 10 is wound around each tooth of the stator core 9. Here, resin (for example, PPS) insulators 13 for insulating the coil 10 from the stator core 9 are mounted from both axial ends of the stator core 9. The stator 5 includes a plurality of divided stator cores 9, and each stator core 9 is fastened and fixed by a cylindrical thin metal (for example, iron) fixing member 8.

  The end of the coil 10 is electrically connected to a bus bar (not shown). The insulator 13 is molded integrally with three bus bars that serve as drive terminals for the brushless motor 3. Each bus bar extends from the right end portion of the insulator 13 in parallel to the central axis.

  The pump plate 14 and the pump housing 15 are made of a nonmagnetic material (for example, aluminum die casting). The motor housing 26 and the lid 27 that house the brushless motor 3 and the controller 4 are formed of a resin material (for example, a thermoplastic resin). The housing of the electric oil pump device 1 is composed of the pump plate 14, the pump housing 15, the motor housing 26, and the lid 27.

  Further, in the electric oil pump device 1 of the present embodiment, a control board (hereinafter referred to as a board) 19 of the controller 4 for controlling the brushless motor 3 is provided on the metal holding member 17 in the motor housing 26. It is attached via the portions 18a and 18b. The circuit board 19 is provided with an inverter circuit that converts a direct current power source into an alternating current to supply a drive current to each coil 10 of the brushless motor 3, and an inverter based on information on the rotational position of the outer rotor detected by a sensor such as a Hall element. A control circuit unit 20 including a control circuit for controlling the circuit is mounted. The inverter circuit constituting the control circuit unit 20 of the controller 4 and electronic components such as a microcomputer, a coil, and a capacitor of the control circuit are mounted on both surfaces of the substrate 19.

  A bus bar which is a drive terminal of the brushless motor 3 connected to each coil 10 and insulated and supported by the insulator 13 is inserted into the substrate 19 and connected to the control circuit unit 20 on the substrate 19. Further, a connector shell is provided integrally with the motor housing 26 on the side surface of the motor housing 26, and a connector pin inside thereof is connected to the control circuit unit 20 on the substrate 19.

  With the above configuration, the drive current controlled by the control circuit unit 20 is supplied to each coil 10 of the brushless motor 3. As a result, a rotating magnetic field is generated in the coil 10, torque is generated in the permanent magnet, and the rotor 6 is rotationally driven. Thus, when the inner rotor is driven to rotate, the outer rotor is driven and rotated, and the gap between the inner teeth of the outer rotor and the outer teeth of the inner rotor repeatedly expands and contracts. Pump operation for suction and discharge is performed.

  Next, FIG. 2 is a schematic cross-sectional view showing a connection state of the ground path in FIG. As shown in FIG. 2, the pump housing 15, the fixing member 8, and the holding member 17 are combined with each other in the direction of the central axis to fix the stator 5 and the rotor 6 of the brushless motor 3.

One of the holding members 17 is made of a cylindrical metal material (for example, aluminum alloy), and an outer peripheral end portion is fitted into an outer peripheral end portion of the fixing member 8. A plurality of (for example, two) fastening portions 18a, 18b are formed to fix the. The fastening portions 18a and 18b are in contact with the ground portion (ground) of the power source of the control circuit portion 20 provided on the substrate 19, and are screwed from the substrate 19 side, for example. As a result, a conduction path connected from the ground portion of the substrate 19 to the pump housing 15 via the fastening portions 18a and 18b is formed and is electrically grounded. For reference, the ground path is shown in FIG. 2 (arrow broken line).

Further, a plurality of flange portions 23 protruding from the outer peripheral end portion of the pump housing 15 are formed with through holes 28 through which the bolts 24 are passed. A bush 25 made of an insulating material is fitted into the through hole 28. The bolt 24 is inserted into the bush 25 and screwed to the vehicle case (attached portion) 22, and the flange portion 23 is insulated and supported with a slight gap with respect to the vehicle case 22. In this embodiment, the bolts are fastened by three bolts 24 arranged at equal intervals in the circumferential direction with respect to the shaft center.

  FIG. 3 is a front view seen from the direction of arrow A in FIG. Here, only the outer portion such as the housing and the holding member 17 portion are shown, and the fixing bolt and the internal structure are omitted.

  Next, the operation and effect of the electric oil pump device 1 according to the present embodiment configured as described above will be described.

  According to the above configuration, in the electric oil pump device 1 in which the brushless motor (electric motor) 3 and the controller 4 are arranged adjacent to the oil pump 2 along the central axis direction with respect to the oil pump 2, the pump housing 15 A cylindrical thin metal fixing member 8 that fixes the stator 5 of the brushless motor 3 and a metal holding member 17 that supports the bearing 12 disposed on one side of the rotor 6 are connected to each other. A plurality of (for example, two) fastening portions 18 a and 18 b for fixing the substrate 19 are provided on the outer periphery of the end surface of the holding member 17 so as to come into contact with the ground portion of the power source of the control circuit unit 20 provided on the substrate 19. Place and electrically ground.

  Accordingly, even if noise enters the control circuit unit 20 on the substrate 19 via the motor housing 26 of the brushless motor 3 from the outside, or noise occurs in the control circuit unit 20 on the substrate 19, the substrate 19 Therefore, noise is absorbed or shielded because it is electrically grounded through a conduction path to the pump housing 15 via the grounding portion, the holding member 17 and the fixing member 8. As a result, the board 19 and the control circuit unit 20 of the controller 4 can operate stably while suppressing the influence of noise.

Further, a plurality of (for example, three) flange portions 23 projecting from the outer peripheral end portion of the pump housing 15 provided for fixing the pump housing 15 to the vehicle case (attached portion) 22 with bolts 24 are arranged in the plate thickness direction. A through hole 28 is provided, and a bush (insulating member) 25 is inserted into the through hole 28. The flange portion 23 is insulated and supported with a slight gap with respect to the vehicle case 22, and the electric oil pump device 1 is fixed to the vehicle case 22 with bolts 24.

  Thereby, the vehicle case 22 and the electric oil pump device 1 are electrically insulated by the bush 25, and the electric oil pump device 1 can be grounded (grounded) by itself. As a result, the substrate 19 and the control circuit unit 20 of the controller 4 can prevent adverse effects due to external noise as much as possible.

  Further, in the ground connection form as described above, a filter component such as a choke coil or a capacitor is added to the power supply circuit on the substrate 19 or the ground line in the substrate 19 is strengthened in order to remove noise. By taking the above measures, it is possible to obtain an electrically sufficient ground connection state. For this reason, since it can be expected that the filter component can be reduced in capacity and size, the electric oil pump device 1 is low in cost without increasing its shape.

  As described above, according to the present embodiment, it is possible to provide an electric oil pump device that can stably operate while suppressing adverse effects due to noise inside and outside the motor control circuit unit.

  Although one embodiment according to the present invention has been described above, the present invention can also be implemented in other forms.

  In the above-described embodiment, an example in which the bush 25 for insulating the vehicle case 22 is provided in the through hole 28 of the flange portion 23 has been described. However, the present invention is not limited thereto, and the entire surface of the flange 23 is sealed to prevent oil leakage. You may make it use the packing etc. which do.

  Further, in the above-described embodiment, the example in which the two fastening portions 18a and 18b are provided on the holding member 17 has been shown. However, the number of the fastening portions 18a and 18b to be arranged is not limited to this, and noise countermeasures are provided. As long as a sufficient grounding effect can be obtained.

  In the above embodiment, the case where the ground connection means of the brushless motor 3 and the controller 4 is applied to the electric oil pump device 1 has been described. However, the present invention is not limited to this, and other devices using the same brushless motor 3 are used. You may apply to.

1: electric oil pump device, 2: oil pump, 3: brushless motor (electric motor),
4: controller, 5: stator for motor, 6: rotor for motor, 7: rotary drive shaft,
8: fixing member, 9: stator core, 10: motor coil, 11, 12: bearing,
13: Insulator, 14: Pump plate, 15 Pump housing,
16: Pump part, 17: Holding member, 18a, 18b: Fastening part, 19: Board | substrate (control board),
20: Control circuit part, 21: Motor fixing bolt, 22: Vehicle case (attached part),
23: flange part, 24: flange fixing bolt, 25: bush (insulating member),
26: Motor housing, 27: Lid, 28: Flange through hole

Claims (2)

An oil pump,
An electric motor provided adjacent to the oil pump and driving the oil pump to rotate;
In an electric oil pump device provided adjacent to the electric motor, and having a controller for driving and controlling the electric motor,
A pump housing of the oil pump ;
A fixing member comprising a cylindrical metal member the outer periphery was fixed before Symbol electric motor stator,
There is disposed a bearing for rotatably supporting one of the rotary shaft of the rotor before Symbol electric motor, a holding member of linked metal member to said pump housing comprises,
The inner periphery of the end surface protrusion of the pump housing is fitted with the outer periphery of one shaft end of the fixing member, and the inner periphery of the other shaft end of the fixing member is fitted with the outer periphery of the holding member. And
The holding member has a fastening portion for fixing the control board of the controller to an end surface;
Electric said fastening portion and the control board provided grounding portion to contact to state is fixed by a, wherein Rukoto that having a path formed electrically connected to said pump housing from said ground portion Oil pump device. The electric oil pump device according to claim 1,
The pump housing has a through-hole is provided penetrating in the thickness direction on the flange portion projecting from an outer peripheral end portion, is inserted into the through-hole, a gap between the flange portion and the mounting portion An electric oil pump device comprising an insulating member for electrically insulating.

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