JPH11166483A - Motor-driven pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor-driven pump device which can be installed easily and permits small-sized construction of the whole device. SOLUTION: A motor-driven pump device is equipped with a pump 1, a motor 4 whose shaft 41 is coupled through a shaft coupling 3 to a drive shaft 11 borne rotatably by a pump housing 12, and a seal member 7 to seal the area around the drive shaft 11, wherein a motor control apparatus 5 to control the motor 4 is furnished in a space between the motor 4 and shaft coupling 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electric pump device provided with a pump driven by an electric motor.

[0002]

2. Description of the Related Art FIG. 3 is a vertical sectional side view showing a conventional electric pump device. An electric pump device that supplies hydraulic oil to a hydraulic actuator such as a hydraulic actuator disposed in a steering mechanism of an automobile supports a drive shaft A and the drive shaft A rotatably, for example, as shown in FIG. Pump housing B
, An electric motor F provided with a motor shaft E interlocked with the drive shaft A via a shaft coupling D, and a pump C And a sealing member G for preventing oil from leaking into the electric motor F from above.

[0003] The motor control device for controlling the electric motor F of the electric pump device configured as described above is provided separately from the electric pump device.

However, in such an electric pump device in which the motor control device is separately provided, it is necessary to provide wiring for connecting the motor control device and the electric motor F, and these separate installation locations are required. Installation is complicated, for example, it is necessary to secure

The present invention has been made in view of such circumstances, and in an electric pump device including a motor control device for controlling an electric motor for driving a pump, the motor control device is provided between a pump and the electric motor. The purpose of the present invention is to provide an electric pump device which can be easily installed and can be reduced in size as a whole by providing the electric pump device.

[0006]

An electric pump device according to a first aspect of the present invention is an electric pump device in which a motor shaft is connected via a shaft coupling to a pump and a drive shaft rotatably supported by a housing of the pump. An electric pump device including a motor and a sealing member that seals the periphery of the drive shaft, further comprising a motor control device provided in a space between the electric motor and a shaft coupling.

The electric pump device according to a second aspect of the present invention is the electric pump device according to the first aspect, wherein the housing is provided in a shaft hole through which the drive shaft is inserted, and the sealing member has a diameter larger than that of the shaft hole. And a receiving unit.

The electric pump device according to a third aspect of the present invention is the electric pump device according to the first aspect, wherein the housing is provided in a shaft hole through which the drive shaft is inserted, and the housing of the shaft coupling having a diameter larger than the shaft hole. It is characterized by having a receiving part.

According to a fourth aspect of the present invention, there is provided an electric pump device comprising: a pump; an electric motor having a motor shaft connected to a drive shaft rotatably supported by a housing of the pump via a shaft coupling; An electric pump device comprising: a sealing member that seals around the shaft; and a motor control device provided in a space between the electric motor and the shaft coupling. It is characterized by being arranged on the drive shaft side.

An electric pump device according to a fifth aspect is the electric pump device according to the fourth aspect, wherein the housing is
It is provided with the receiving part of the above-mentioned sealing member provided in the above-mentioned drive shaft side portion of the shaft hole which penetrated the above-mentioned drive shaft, and having a diameter larger than this shaft hole.

An electric pump device according to a sixth invention is the electric pump device according to the fourth invention, wherein the housing is
It is provided in the part of the shaft hole which penetrated the drive shaft at the side of the drive shaft, and has a receiving part of the shaft coupling with a diameter larger than the shaft hole.

In the first invention, since the motor control device is provided integrally with the pump and the electric motor, the installation is easy and the whole device can be downsized.

In the fourth aspect, the shaft coupling is disposed on the drive shaft side with respect to the sealing member for sealing around the shaft, so that the motor control device is interposed between the pump and the electric motor. In this case, even if a low-cost wet type is used for the shaft coupling, there is no danger that the motor control device will be immersed in the liquid.

In the electric pump device, oil leakage from the pump to the electric motor causes a failure of the electric motor. Therefore, the presence or absence of leakage from the sealing member is inspected. Then, in a state where the sealing member is removed, it is possible to detect a leak from a connection portion between the housing of the motor control device and the housing of the pump. Leakage from itself can be detected. Therefore, leakage from, for example, a connector mounting hole in the housing of the motor control device and leakage around the shaft can be easily distinguished and detected, and response to leakage can be facilitated.

In the second, third, fifth, and sixth inventions, the receiving portion of the sealing member and the receiving portion of the shaft coupling may include:
Since the structure is provided on the drive shaft side portion of the shaft hole, the sealing member is pressed against the receiving portion by hydraulic pressure acting on the sealing member through the shaft hole from the pump. Therefore, it is not necessary to separately provide a stopper for the sealing member, and the cost can be further reduced.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments. FIG. 1 is a vertical sectional front view of an electric pump device according to the present invention, and FIG. 2 is an explanatory diagram in a case where leakage from a shaft hole of the electric pump device according to the present invention is inspected.

The electric pump device shown in FIG. 1 is provided with a pump 1 in which a drive shaft 11 is rotatably supported by a pump housing 12 and a motor shaft 41 interlocked with the drive shaft 11 via a shaft coupling 3. Electric motor 4 and a sealing member 7 for sealing around the axis of the drive shaft 11.
Further, a control device housing 6 incorporating a motor control device 5 for controlling the electric motor 4 which is a feature of the present invention,
It is provided between the electric motor 4 and the shaft coupling 3, and is provided by the sealing member 7 from the pump 1 to the control device housing 6.
It is designed to prevent oil leakage into the interior.

The pump housing 12 includes the drive shaft 11
And a housing substrate 14 provided with a shaft hole 13 penetrating in the axial direction of the motor shaft 41, and a bottomed cylindrical cover detachably connected to one side of the housing substrate 14 by a plurality of tightening screws. And a body 16.

The drive shaft 11 is mounted on the housing substrate 14.
, A driven gear 18 that meshes with the drive gear 17, and the drive gear 17 and the driven gear 1
A pump unit 1a including a gear housing 20 having a gear chamber 19 containing the motor 8 is mounted.

The gear housing 20 has a suction port communicating with the gear chamber 19 and the cover body 16 and the gear chamber 1.
A discharge port (both not shown) communicating with the discharge port 9 is provided, and a bottomed noise damper cylinder 21 provided with an empty chamber communicating with the discharge port is detachably attached.

The communication passage 2 is provided in the housing substrate 14.
A substantially L-shaped discharge passage 23 that communicates with the inside of the noise damper cylinder 21 through a second passage 2, a relief passage 24 that opens into the discharge passage 23, and the shaft hole 13 are provided.

As shown in FIG. 1, the shaft hole 13 has a sealing member receiving portion 26 having a diameter larger than that of the shaft hole 13 and a sealing member receiving portion through a step 25 at the pump portion 1a side. 26 is provided with a joint receiving portion 27 that is continuous with the sealing member receiving portion 26 and the joint receiving portion 27.
a side) and the drive shaft 1
The shaft joint 3 is lubricated with hydraulic oil that penetrates around the shaft hole 1 and penetrates into the shaft hole 13, and the sealing member 7 is compressed by the pressure of the penetrating hydraulic oil.
Is pressed against the step portion 25 to prevent the sealing member 7 from moving to the shaft joint 3 side.

The shaft coupling 3 is formed of a sintered material into a cylindrical shape, and has an inner surface at one end and an inner surface at the other end.
1 and the end of the motor shaft 41 cannot be rotated relative to each other, and are fitted so as to be detachable in the axial direction.

The control device housing 6 is formed integrally with the other side of the housing substrate 14, and a disc-shaped lid is provided at an end of the control device housing 6 on the electric motor 4 side via an annular sealing plate 60. 8 is detachably mounted by a plurality of tightening screws 9. Further, the control device housing 6 has one side protruding outward, a through hole 62 for mounting a connector is provided in the protruding portion 61, the connector 10 is inserted into the through hole 62, and the connector 10 is The sealing member 30 is provided between the outer peripheral surface and the through hole 62.

In the sealing member 30 of the embodiment, after the molten sealing agent is poured between the outer peripheral surface of the connector 10 and the through hole 62, the sealing agent is cured to form the sealing member 30. However, the structure of the sealing member 30 is not particularly limited.

The motor control device 5 built in the control device housing 6 includes a circuit board 51 disposed so as to surround the motor shaft 41 and a plurality of capacitors 52 which are mounted on the circuit board 51 in a bare manner. It has.

The electric motor 4 has a motor housing 42 as shown in FIG. 1, and the motor housing 42 is removably attached to the control device housing 6 together with the lid 8.

In the drawing, reference numeral 31 denotes a cartridge type relief valve removably mounted in the relief passage 24, and 32 denotes a cover member 16 of the pump housing 12.
Liquid return port provided in

The electric pump device configured as described above
The drive gear 17 and the drive gear 17 are driven by the electric motor 4 via the motor shaft 41, the shaft coupling 3, and the drive shaft 11.
The driven gear 18 that meshes with the gear chamber 1 rotates, and the hydraulic oil flows into the gear chamber 1.
9 to a discharge passage 23 via a discharge port, a noise damper cylinder 21 and a communication passage 22, and from the discharge passage 23 to one working chamber of a hydraulic working device, from the other working chamber of the hydraulic working device. The working fluid is returned to the fluid return port 32.

Prior to assembling the entire electric pump device configured as described above, the sealing member 7 for the shaft hole 13 and the sealing member 30 for the through hole 62 for mounting a connector are required.
And whether there is leakage from the sealing plate 60 at the end of the control device housing 6.

In this inspection, the pump section 1a, the cover 16
In a state where the sealing member 7 is not mounted, the connector 10 is inserted into the connector mounting through hole 62 of the control device housing 6, sealed with the sealing member 30, and further, a sealing plate is mounted on the control device housing 6. After the lid 8 and the electric motor 4 are mounted via 60, as shown in FIG. 2, an air leak jig in which the housing substrate 14 is provided with a communication passage communicating with the joint receiving portion 27 and the discharge passage 23 is provided. Wear 33,
The joint receiving portion 27 is filled with compressed air of a predetermined pressure from the discharge passage 23 through the communication passage of the air leak jig 33.

A differential pressure sensor O interposed between the filling compressed air circuit N1 and the sealing circuit N2 detects the pressure difference between the filling compressed air circuit N1 and the sealing circuit N2,
Leakage of the connector mounting through-hole 62 from the sealing member 30;
Then, the presence or absence of leakage from the sealing plate 60 is detected. still,
In FIG. 2, P1 and P2 are solenoid valves.

After inspecting the connector mounting through hole 62 for leakage from the sealing member 30 and for leakage from the sealing plate 60, the air leakage jig 33 is once removed, and the joint receiving member of the housing substrate 14 is received. The sealing member 7 is inserted from the portion 27 into the sealing member receiving portion 26.

Next, in the same manner as described above, the air leak jig 33 is mounted on the housing substrate 14, and a predetermined pressure is compressed from the discharge passage 23 to the joint receiving portion 27 through the communication passage of the air leak jig 33. Fill with air.

A differential pressure sensor O interposed between the filling compressed air circuit N1 and the sealing circuit N2 detects the pressure difference between the filling compressed air circuit N1 and the sealing circuit N2.
The presence or absence of leakage of the shaft hole 13 from the sealing member 7 is detected.

As described above, the leakage of the connector mounting through-hole 62 in the control device housing 6 from the sealing member 30 and the sealing plate 60 and the leakage of the shaft hole 13 from the sealing member 7 are described. Since inspection can be performed individually, it is possible to easily cope with leakage.

The sealing member receiving portion 26 and the joint receiving portion 27 are provided at a portion of the shaft hole 13 on the drive shaft 11 side, and the hydraulic pressure acting on the sealing member 7 through the shaft hole 13 from the pump 1 acts on the shaft member 13. Since the sealing member 7 is pressed and received by the step portion 25 of the sealing member receiving portion 26, there is no need to particularly provide a stopper for the sealing member 7, and the cost can be reduced.

The shaft coupling 3 is disposed on the drive shaft 11 side with respect to the sealing member 7 so that hydraulic oil leaking from the periphery of the drive shaft 11 lubricates the shaft coupling 3. 3 can be formed of a sintered material, and the cost of the shaft coupling 3 can be reduced as compared with a conventional one formed of a high-strength synthetic resin containing glass. Since the shaft coupling 3 can be lubricated, wear and noise of the shaft coupling 3 can be reduced.

The electric pump device of the present invention mainly operates by hydraulic pressure, such as a power steering device of an automobile, an automatic transmission, etc., and generates a hydraulic pressure of an auxiliary machine for assisting a driving operation. Is used as
Its use is not restricted.

[0040]

As described in detail above, in the electric pump device according to the present invention, since the motor control device is provided integrally with the pump and the electric motor, the installation is easy and the whole device can be downsized. Can be.

Further, since the shaft coupling is arranged on the drive shaft side with respect to the sealing member for sealing around the shaft, when the motor control device is interposed between the pump and the electric motor, the shaft coupling is For example, even if a low-cost wet type is used, there is no danger that the motor control device will be immersed in the liquid.

In the electric pump device, oil leakage from the pump to the electric motor side causes a failure of the electric motor, and therefore, the presence or absence of leakage from the sealing member is inspected. Then, in a state where the sealing member is removed, it is possible to detect a leak from a connection portion between the housing of the motor control device and the housing of the pump. Leakage from itself can be detected. Therefore, leakage from, for example, a connector mounting hole in the housing of the motor control device and leakage around the shaft can be easily distinguished and detected, and response to leakage can be facilitated.

Further, since the receiving portion of the sealing member and the receiving portion of the shaft coupling have a structure provided on the drive shaft side portion of the shaft hole, the receiving portion of the shaft hole passes through the shaft hole to the sealing member. The sealing member can be pressed against the receiving part by the acting hydraulic pressure and received by the receiving part,
The present invention has an excellent effect, for example, there is no need to separately provide a stopper for the sealing member, and the cost can be further reduced.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of an electric pump device according to the present invention.

FIG. 2 is an explanatory diagram in a case of inspecting a leak from a shaft hole of the electric pump device according to the present invention.

FIG. 3 is a vertical sectional side view showing a conventional electric pump device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump 3 Shaft coupling 4 Electric motor 5 Motor control device 6 Control device housing 7 Sealing member 11 Drive shaft 12 Pump housing 13 Shaft hole 26 Sealing member receiving part 27 Joint receiving part 41 Motor shaft

Claims (6)

[Claims] 1. A pump, an electric motor having a motor shaft connected to a drive shaft rotatably supported by a housing of the pump via a shaft coupling, and a seal for sealing around the shaft of the drive shaft. An electric pump device comprising a stop member and a motor control device provided in a space between the electric motor and a shaft coupling. 2. The electric pump device according to claim 1, wherein the housing is provided in a shaft hole through which the drive shaft is inserted, and has a receiving portion for the sealing member having a larger diameter than the shaft hole. 3. The electric pump device according to claim 1, wherein the housing is provided in a shaft hole through which the drive shaft is inserted, and has a receiving portion for the shaft coupling having a diameter larger than that of the shaft hole. 4. An electric motor having a pump, a drive shaft rotatably supported by a housing of the pump, and a motor shaft connected to the drive shaft via a shaft coupling, and a seal for sealing around the drive shaft. An electric pump device including a stop member, a motor control device provided in a space between the electric motor and a shaft coupling, wherein the shaft coupling is disposed on the drive shaft side with respect to the sealing member. An electric pump device, comprising: 5. The electric motor according to claim 1, wherein the housing is provided at the drive shaft side portion of the shaft hole through which the drive shaft is inserted, and has a receiving portion for the sealing member having a diameter larger than the shaft hole. Pump device. 6. The electric pump according to claim 1, wherein the housing is provided in the drive shaft side portion of the shaft hole through which the drive shaft is inserted, and has a receiving portion for the shaft coupling having a diameter larger than the shaft hole. apparatus.