JP2006274968A - Electric pump unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric pump unit manufacturable at low cost by reducing the number of parts and man-hours. <P>SOLUTION: This electric pump unit comprises a motor case 11 storing a motor part 1 installed at one end of a shaft 5 and rotating the shaft 5, a pump case 12 storing a gear part 2 fitted to the other end of the shaft 5, a controller case 17 storing a controller part 3 drivingly controlling the motor part 1, and a connector shell 18 of a connector part 4 connecting the controller part 3 to the outside. The controller case 17 and the connector shell 18 are formed integrally with each other by using a resin. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric pump unit having a motor, a gear pump, and a motor controller.

  In recent years, as one of the energy saving trends in automobiles, an electric pump is used as a drive source for various devices mounted on automobiles, and a necessary hydraulic output is obtained only when necessary. . By mounting such an electric pump, for example, when the engine is stopped, it is possible to secure a hydraulic source of a drive system assisting actuator such as a transmission and a clutch.

  In a general electric pump, a drive shaft of an electric motor unit and a rotation shaft of a gear pump unit are coupled by a joint member. However, such an electric pump requires a space for a joint member, which is an obstacle to making the electric pump compact. For this reason, for example, Patent Document 1 and Patent Document 2 disclose that the drive shaft and the rotation shaft are made common to eliminate the need for a joint member.

JP 2004-204694 A (FIG. 1) JP 2004-204695 A (FIG. 1)

However, the electric pumps described in Patent Document 1 and Patent Document 2 are integrated into a unit by connecting a motor case housing a motor unit and a pump case housing a gear unit serving as a gear pump. However, a controller unit for driving and controlling the motor unit is required separately from the electric pump. In particular, when an electric pump is provided in a transmission part of an automobile, an installation space is limited, and it is difficult to separately install a controller part. Therefore, an electric pump unit in which a controller case that houses a controller unit in a motor case is connected can be considered. Then, it is conceivable that the controller part (circuit board) is accommodated in the controller case, and the internal controller part and the external power supply side are connected in the connector part attached to the controller case.

  In this case, the resin connector shell of the connector portion is attached to the metal controller case with a small screw. Since a waterproof property is required between the controller case and the connector shell, a seal member such as a 0 ring is provided between them. Furthermore, there is a problem that the surface accuracy between the mounting surfaces is required to be high, and a female screw hole for screwing a small screw is required in the controller case, resulting in a very high manufacturing cost. Furthermore, since the motor case connected to the controller case has a circular cross section and the mounting surface of the connector shell in the controller case is a flat surface, the metal controller case requires a cylindrical portion and a rectangular tube portion, and has a shape. It is complicated and it is difficult to produce a metal controller case at low cost.

  The present invention has been made in view of the above problems, and an object thereof is to provide an electric pump unit that can be manufactured at a low cost by reducing the number of parts and the number of manufacturing steps.

  In order to achieve the above object, an electric pump unit of the present invention includes a motor case that is provided on one end side of a shaft and accommodates a motor unit that rotates the shaft, and a gear that is provided on the other end side of the shaft. An electric pump unit including a pump case that houses a controller part, a controller case that houses a controller part that drives and controls the motor part, and a connector shell that connects the controller part to the outside. The controller case and the connector shell are formed as an integrally molded product made of resin.

According to the electric pump unit having such a configuration, since the controller case and the connector shell are integrally formed, a seal member between them, which has been conventionally required, can be eliminated, and the connector shell can be attached. Small screws and screw holes for small screws are not required, and the number of parts can be reduced and the structure can be simplified. Further, since the controller case and the connector shell are integrally formed of resin, they can be easily formed by injection molding. Further, the integrally molded product of the controller case and the connector shell is integrated with a protruding connector shell having a circular portion for connection with the motor case when the motor case has a circular cross section. Although it has a complicated shape, it can be easily molded by resin injection molding.
In addition, since this electric pump unit has a motor case containing the motor part and a controller case containing the controller part as one unit, a harness for connecting the motor part and the controller part is provided. This eliminates the need for cost reduction.

  The pump case, the motor case, and the controller case are preferably arranged in a line along the axial direction of the shaft. According to this configuration, the size of the electric pump unit in the radial direction can be reduced. That is, since there is no case arranged in the radial direction, the radial dimension can be reduced and the size can be reduced. Therefore, the electric pump unit can be attached to the small gap.

  Further, the controller case and the connector shell are formed as an integrally formed product in which the motor case is provided in a mold and molded together with the motor case, and the controller case is closely fitted to the motor case. It is preferable. According to this structure, the connection member for connecting a controller case and a motor case can be made unnecessary. Further, the controller case and the motor case can be sealed by fitting, and a sealing member such as an O-ring can be dispensed with. Therefore, the number of parts can be reduced, and a compact and lightweight electric pump unit can be obtained.

  Moreover, it is preferable that the controller case and the connector shell are an integrally molded product in which a vent filter shell of a vent filter for ventilation is further integrated with a resin. According to this structure, the attachment structure for vent filter shells can be made unnecessary. For example, it is not necessary to provide a mounting hole in the controller case, and it is not necessary to provide a claw portion for hooking the controller case in the vent filter shell. Therefore, the number of parts can be reduced, and the manufacturing cost can be reduced.

According to the electric pump unit of the present invention, there is no need for a seal member between the connector portion and the controller portion, and there is no need for a small screw or screw hole processing for connecting them, thereby reducing the number of parts and manufacturing man-hours. Manufacturing cost can be reduced. In addition, the electric pump unit can be reduced in size and weight.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a longitudinal sectional view showing an electric pump unit according to an embodiment of the present invention. This electric pump unit is a hydraulic pump that can be used for an automobile transmission that requires a relatively low pressure of about 0.4 MPa to 1 MPa. This electric pump unit is equipped with a trochoid pump which is a kind of inscribed gear pump, can reduce pulsation and reduce noise, and is suitable as a transmission pump.

The electric pump unit includes a pump case 12, a motor case 11, and a controller case 17. The motor case 11 is connected to the pump case 12, and the controller case 17 is connected to the motor case 11. The pump case 12 is covered with a pump plate 16 from one side, and the controller case 17 is covered with a lid member 19 from the other side. Further, this unit is provided with a connector portion 4, and a connector shell 18 of the connector portion 4 is formed on the peripheral wall 24 of the controller case 17.

The electric pump unit includes a shaft 5 in these cases, and further includes a motor unit 1 that rotates the shaft 5 and a gear unit 2 that constitutes the trochoid pump. The motor unit 1 is provided on one end side 5 a of the shaft 5, and the gear unit 2 is provided on the other end side 5 b of the shaft 5.
The motor unit 1 includes a motor stator 6 fixed in a motor case 11 and a motor rotor 7 that is provided on the radially inner side of the motor stator 6 and is externally fitted to the shaft 5. The motor stator 6 has a coil wound around a core, and the motor rotor 7 has a permanent magnet fixedly fitted on one end side 5 a of the shaft 5, and the permanent magnet rotates integrally with the shaft 5. That is, the motor unit 1 is accommodated in the motor case 11.

The gear portion 2 includes an inner gear 8 having a trochoidal tooth profile formed on the outer periphery, and an outer gear 9 having a trochoidal tooth profile formed on the inner periphery and meshing with the inner gear 8. The inner gear 8 is fitted and fixed to the other end side 5 b of the shaft 5, and the outer gear 9 is rotatably accommodated in the recess 26 of the pump case 12. A through hole through which the shaft 5 is inserted is formed in the bottom wall of the recess 26.
Thereby, when the shaft 5 is rotationally driven by the motor unit 1, the inner gear 8 rotates, the outer gear 9 meshing with the inner gear 8 rotates, and a pump action is generated between the inner gear 8 and the outer gear 9. A space formed between the inner gear 8 and the outer gear 9 communicates with a suction port and a discharge port (not shown) formed in a penetrating manner in the pump plate 16, and the suction port is provided by the pump action. The oil sucked from is discharged from the discharge port.

  The controller unit 3 is electrically connected to the motor unit 1, and has a circuit board that drives and controls the motor unit 1 to control the rotation of the shaft 5. The connector unit 4 connects the controller unit 3 to the external power supply side, and the connector unit 4 has a connector shell 18 for connecting a harness or the like connected to the power supply side. The controller unit 3 is supplied with power, an ON / OFF control signal, and the like from a central control device (not shown) provided in the automobile via the connector unit 4.

  Further, a first bearing 13 is provided in the motor case 11, the first bearing 13 supports the end 5 a end of the shaft 5, and the intermediate portion of the shaft 5 is supported by the second bearing 14. The second bearing 14 is provided in the pump case 12. Further, in the pump case 12, a seal member 15 that is in sliding contact with the outer peripheral surface of the shaft 5 is provided on the other end side 5 b of the shaft 5 with respect to the second bearing 14, and the seal member 15 is provided in the pump case 12. The oil in the recess 26 can be sealed.

That is, in this electric pump unit, the motor case 11 accommodates the motor part 1 provided on the one end side 5 a of the shaft 5, and the pump case 12 includes the gear part 2 provided on the other end side 5 b of the shaft 5. The controller case 17 accommodates the controller unit 3, the connector shell 18 is provided on the peripheral wall 24 of the controller case 17, the motor case 11, the pump case 12, the controller case 17, and the connector. The electric pump unit is assembled by integrating the shell 18.

In the electric pump unit, the controller case 17 and the connector shell 18 are integrally formed of resin. That is, the controller case 17 is integrally made of resin together with the connector shell 18, and the connector shell 18 protrudes radially outward from a part of the peripheral wall 24 of the cylindrical controller case 17. And is formed as one piece.
The connector shell 18 has a bottomed cylindrical shape that opens outward in the radial direction, and the bottom wall 23 of the connector shell 18 is configured as a peripheral wall 24 of the controller case 17. A connector pin 25 protrudes from the bottom wall 23 inside the connector shell 18. The connector pin 25 passes through the bottom wall 23 of the connector shell 18 at an intermediate portion thereof, the connector pin 25 extends to the inside of the controller case 17, and the base end side of the connector pin 25 is the controller inside the controller case 17. Connected to the unit 3.

Further, the controller case 17 can be connected to the end of the motor case 11 at its end by, for example, screwing. Alternatively, as another connection structure, the end portion of the motor case 11 may be press-fitted and fitted into the opening end portion of the controller case 17.
FIG. 2 is a longitudinal sectional view for explaining another connection structure. A controller case 17 and a connector shell 18 which are integrally formed of a resin have a motor case 11 provided in a mold in advance. It is assumed that it is molded together with the case 11. That is, when the molten resin is injected into the mold and the controller case 17 and the connector shell 18 are integrally formed, the cylindrical motor case 11 is previously disposed at a predetermined position in the mold, and then the mold is placed in the mold. The molten resin is injected, the molten resin is cured, and the end of the cylindrical controller case 17 is closely attached to the outer peripheral surface of the end of the motor case 11.

  In this case, as shown in FIG. 2, if the fitting uneven portion 27 is provided between the motor case 11 and the controller case 17, the mutual fitting becomes stronger, and in particular, the axial center C direction can be prevented from coming off. . In FIG. 2, a recess is provided on the outer peripheral surface of the motor case 11, and a part of the inner peripheral surface of the controller case 17 is a convex portion that enters this recess, and the fitting uneven portion 27 is formed. The recess may be a groove continuously in the circumferential direction on the outer peripheral surface of the motor case 11, or may be a groove having a predetermined circumferential length or a predetermined groove having a predetermined axial direction on the outer peripheral surface. There may be. The material of the motor case 11 can be made of a metal such as an aluminum alloy. A lid member 19 (see FIG. 1) for covering the controller case 17 is made of a metal such as an aluminum alloy having a heat radiation fin, and the lid member 19 is screwed to the controller case 17.

  Further, FIG. 3 shows another embodiment of the controller case 17 and the connector shell 18 which are integrally formed. The controller case 17 and the connector shell 18 are formed by the vent filter shell 22 of the vent filter portion 21 for ventilation. It is an integrally molded product that is further integrated with resin. That is, the vent filter shell 22 is integrally formed on a part of the peripheral wall 24 of the controller case 17. The vent filter shell 22 accommodates a filter member (not shown), and the filter member is made of, for example, a resin nonwoven fabric or a resin porous membrane and has air permeability.

  The controller case 17 of the present invention includes a cylindrical section 28 having a circular cross section for connection to the outer peripheral wall of the circular cylindrical motor case 11, a half having a circular cross section continuous with the cylindrical section 28, and the other half having a square cross section. And the rounded cylindrical portion 29 are continuously provided in the direction of the axis C. And the connector shell 18 is formed in the plane wall part of the rounded round cylinder part 29. FIG. In FIG. 3, the vent filter shell 22 is formed side by side in a direction parallel to the connector shell 18 and the axis C of the shaft 5.

  In the electric pump unit of the present invention, as shown in FIG. 1, the pump case 12, the motor case 11, and the controller case 17 are arranged in a line along the axis C direction of the shaft 5. That is, the pump case 12, the motor case 11, and the controller case 17 are arranged in series in the direction of the axis C of the shaft 5. Thereby, the circuit board of the controller unit 3 is arranged on one side of the motor unit 2 in the axis C direction, and the gear unit 2 is arranged on the other side of the motor unit 2 in the axis C direction. The direction perpendicular to the axis C of the circuit board is the surface direction of the circuit board.

  Moreover, the electric pump unit of the present invention is not limited to the illustrated form, and may be of another form within the scope of the present invention. For example, the number of circuit boards of the controller unit 3 is two instead of one as shown in FIG. 1, and one is arranged on one side in the axis C direction of the motor unit 1, and one is more radial than this. It may be arranged on the outside so that the circuit boards are orthogonal to each other. Moreover, the internal gear pump in the gear part 2 can be an internal tooth type such as involute, paracoid, hypocycloid or the like.

It is a longitudinal cross-sectional view which shows the electric pump unit which concerns on one Embodiment of this invention. It is a longitudinal cross-sectional view explaining the connection structure of a motor case and a controller case. It is a perspective view of a controller case.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor part 2 Gear part 3 Controller part 4 Connector part 5 Shaft 11 Motor case 12 Pump case 17 Controller case 18 Connector shell 21 Vent filter part 22 Vent filter shell C Axis center

Claims (4)

  A motor case that is provided on one end side of the shaft and accommodates a motor part that rotates the shaft, a pump case that accommodates a gear part provided on the other end side of the shaft, and drives the motor part An electric pump unit comprising a controller case housing a controller part to be controlled and a connector shell of a connector part for connecting the controller part to the outside, wherein the controller case and the connector shell are integrated by a resin An electric pump unit characterized by being a molded product.   The electric pump unit according to claim 1, wherein the pump case, the motor case, and the controller case are arranged in a line along the axial direction of the shaft.   The controller case and the connector shell are an integrally molded product in which the motor case is provided in a mold and molded together with the motor case, and the controller case is closely attached to the motor case. The electric pump unit according to claim 1 or 2.   The electric pump according to any one of claims 1 to 3, wherein the controller case and the connector shell are an integrally molded product in which a vent filter shell of a vent filter portion for ventilation is further integrated with a resin. unit.

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