JP2020165376A - Electric oil pump - Google Patents

Abstract

To provide an electric oil pump 1, in which molding costs of a first body 57 and molding costs of a second body 52 in a pump body are restrained from increasing, and oil paths with complicated shapes can be provided to the first body 57 and the second body 52, respectively.SOLUTION: A pump includes a separate plate 58 between a first body 57 and a second body 52, and the separate plate 58 includes openings (58b-d) for communicating an oil path provided to the first body 57 and an oil path provided to the second body 52. The separate plate 58 functions as an axial rear side wall of the oil path provided to the first body 57, and functions as an axial front side wall of the oil path provided to the second body 52. Therefore, the oil path provided to the first body 57 and the oil path provided to the second body 52 can be made into concave parts indented in an axial direction, respectively.SELECTED DRAWING: Figure 7

Description

The present invention relates to an electric oil pump.

Conventionally, the pump body of the pump unit includes a first body arranged on one side in the axial direction of the motor unit and a second body arranged on the other side in the axial direction, and an oil passage serving as an oil passage is provided. , A first body, and an electric oil pump provided in each of the second body are known.

For example, the electric oil pump described in Patent Document 1 includes a pump cover as a first body and a pump housing as a second body as a pump body of a pump portion. The pump housing is located on the other side of the pump cover in the axial direction. Further, the motor portion of the electric oil pump is arranged on the other side in the axial direction from the pump portion. The pump housing is provided with a storage recess as an oil passage, and the pump rotor is housed in the storage recess. The pump cover is provided with a suction chamber, a suction port, a discharge chamber, and a discharge port as oil passages. The suction chamber communicates with the suction side region of the accommodating recess of the pump housing, and the suction port for sucking external oil communicates with the suction chamber. The discharge chamber communicates with the discharge side region of the accommodating recess of the pump housing, and the discharge port for discharging oil to the outside communicates with the discharge chamber.

JP-A-2015-163029

In the electric oil pump described in Patent Document 1, if the design of the suction port and the discharge port provided on the pump cover is changed to a port having a more complicated shape, the molding cost of the pump housing is increased. Specifically, the suction chamber and the discharge chamber provided in the pump cover are recesses that open toward the accommodating recess of the pump housing. When the pump cover is molded by a mold such as a mold, the suction port and the discharge port, which are recesses, are also molded by the mold (cover molding mold) at the same time. On the other hand, the suction port and the discharge port are undercuts (hollow portions) provided inside the base of the pump cover. The undercut is not molded by the cover molding mold, but is molded by a collapsing core such as a sand core set in the cover molding mold. Since it takes time and effort to mold the undercut, the more complicated the shapes of the suction port and the discharge port, the higher the molding cost of the pump cover.

The electric oil pump described in Patent Document 1 has an oil passage (for example, a suction chamber) composed of an undercut provided only in the pump cover, but the undercut is provided in both the pump housing and the pump cover. There is also a configuration in which an oil channel consisting of is provided.

In view of the above background, the present invention suppresses an increase in the molding cost of the first body and the molding cost of the second body, and provides oil passages having a complicated shape in each of the first body and the second body. The purpose is to provide an electric oil pump that can.

An exemplary first invention of the present application includes a pump unit and a motor unit for driving the pump unit, the pump unit includes a pump rotor and a pump body accommodating the pump rotor, and the pump body. Is provided with a first body arranged on one side of the pump body and a second body arranged on the other side of the pump body in the axial direction of the motor portion, and serves as an oil passage. An electric oil pump in which an oil passage is provided in each of the first body and the second body, and the motor portion is arranged on the other side in the axial direction from the pump portion, and the first body. An electric oil pump provided with a separate plate between the second body and the second body, the separate plate having an opening for communicating an oil passage provided in the first body and an oil passage provided in the second body. Is.

According to the exemplary first invention of the present application, the increase in the molding cost of the first body and the molding cost of the second body is suppressed, and oil passages having a complicated shape are provided in each of the first body and the second body. be able to.

It is a perspective view which shows the electric oil pump which concerns on embodiment. It is a vertical cross-sectional view which shows the fracture surface at the position of the central axis J in the electric oil pump. It is a perspective view which shows the pump rotor of the pump part of the electric oil pump. It is a perspective view which shows the view from the front side of the electric oil pump in the state which the 1st body of the pump part was broken in the YZ direction. It is a perspective view which shows the view from the rear side of the 1st body. It is an exploded perspective view which shows the electric oil pump in the state which disassembled the pump part. It is an exploded perspective view which shows the electric oil pump in the state which disassembled the pump part from the angle different from FIG. It is a perspective view which shows the 1st body of the electric oil pump, and a separate plate.

Hereinafter, the electric oil pump according to the embodiment of the present invention will be described with reference to the drawings. In the drawings below, the scale and number of each structure may differ from the actual structure in order to make each configuration easy to understand.

Further, in the drawings, the XYZ coordinate system is shown as a three-dimensional Cartesian coordinate system as appropriate. In the XYZ coordinate system, the X-axis direction is a direction parallel to the axial direction of the central axis J shown in FIGS. 1 and 2. The Y-axis direction is parallel to the lateral direction of the electric oil pump shown in FIG. The Z-axis direction is a direction orthogonal to both the X-axis direction and the Y-axis direction.

Further, in the following drawings, when drawing an arrow along the X-axis direction, the Y-axis direction, and the Z-axis direction, the direction of the arrow is defined as the + side, and the direction of the arrow is defined as the-side.

Further, in the following description, the positive side (+ X side) in the X-axis direction is referred to as "front side", and the negative side (-X side) in the X-axis direction is referred to as "rear side". The front side and the rear side are names used only for explanation, and do not limit the actual positional relationship or direction. The axial front side corresponds to one side in the axial direction in the present invention. The rear side in the axial direction corresponds to the other side in the axial direction in the present invention.

Unless otherwise specified, the direction parallel to the central axis J (X-axis direction) is simply referred to as "axial direction", the radial direction centered on the central axis J is simply referred to as "diametrical direction", and the central axis J is referred to as "radial direction". The circumferential direction around the center, that is, the circumference of the central axis J (θ direction) is simply referred to as the "circumferential direction".

In the present specification, "extending in the axial direction" means not only extending in the strict axial direction (X-axis direction) but also extending in a direction tilted within a range of less than 45 ° with respect to the axial direction. Including. Further, in the present specification, "extending in the radial direction" means that the term extends in the radial direction, that is, in the direction perpendicular to the axial direction (X-axis direction), and 45 ° with respect to the radial direction. Including the case where it extends in a tilted direction within a range of less than.

<Overall configuration>
FIG. 1 is a perspective view showing an electric oil pump 1 according to an embodiment. As shown in the figure, the electric oil pump 1 includes a motor unit 10 and a pump unit 40.

FIG. 2 is a vertical sectional view showing a fracture surface of the electric oil pump 1 at the position of the central axis J. The central axis J is an axis along the axis center of the shaft 12 (motor shaft) of the motor 11 provided in the motor unit 10. The motor unit 10 includes a shaft 12 arranged along a central axis J extending in the axial direction. The pump unit 40 is located on one side (front side) in the axial direction with respect to the motor unit 10, and when driven by the motor unit 10 via the shaft 12, oil is sucked and discharged. Hereinafter, each component will be described in detail.

<Motor unit 10>
As shown in FIG. 2, the motor unit 10 includes a shaft 12, a rotor 20, a stator 22, a motor housing 13, an electrical cover 14, and a circuit board 15.

The motor unit 10 is, for example, an inner rotor type motor. The rotor 20 is fixed to the outer peripheral surface of the shaft 12, and the stator 22 is located radially outside the rotor 20.

(Motor housing 13)
The motor housing 13 is made of metal. The shape of the motor housing 13 is a bottomed tubular shape having a bottom portion 13f on the other side (rear side) in the axial direction. The inner peripheral surface of the motor housing 13 extending in the circumferential direction functions as a stator holding portion for holding the stator 22. The outer surface of the stator 22, that is, the outer surface of the core back portion 22a, which will be described later, is fitted to the inner peripheral surface of the motor housing 13. The stator 22 is fitted and housed in the stator 22 as described above.

(Rotor 20)
The rotor 20 includes a rotor core 20a and a rotor magnet 20b. The rotor core 20a surrounds the shaft 12 around an axis (in the θ direction) and is fixed to the shaft 12. The rotor magnet 20b is fixed to the outer surface of the rotor core 20a along the axis (θ direction). The rotor core 20a and the rotor magnet 20b rotate together with the shaft 12. The rotor 20 may be an embedded magnet type in which a permanent magnet is embedded inside the rotor 20. The embedded magnet type rotor 20 can reduce the risk of the magnet peeling off due to centrifugal force as compared with the surface magnet type in which the permanent magnet is provided on the surface of the rotor 20, and also positively utilizes the reluctance torque. can do.

(Stator 22)
The stator 22 surrounds the rotor 20 around an axis (θ direction) and rotates the rotor 20 around the central axis J. The stator 22 includes a core back portion 22a, a coil 22b, and an insulator (bobbin) 22d.

The shape of the core back portion 22a is a cylindrical shape concentric with the shaft 12. The coil 22b is provided around the insulator (bobbin) 22d, and the conductive wire 22e is wound around the coil 22b.

(Shaft 12)
The shaft 12 extends along the central axis J and penetrates the motor portion 10. The front side (+ X side) of the shaft 12 protrudes from the motor portion 10 and extends into the pump portion 40. The axial front side of the shaft 12 is rotatably supported in the pump portion 40 by a bearing 55 described later. The axial rear side of the shaft 12 is rotatably supported by a bearing 24 arranged on the axial rear side of the rotor 20. Therefore, the support form of the shaft 12 is support at both ends.

(Circuit board 15)
The circuit board 15 is fixed to the outer surface of the bottom 13f of the motor housing 13. A Hall IC for a Hall sensor that detects the rotation angle of the shaft 12 and the rotor 20 is mounted on the circuit board 15. Further, the circuit board 15 includes a power supply terminal and a GND terminal for supplying power to the hall sensor, and a first hall signal terminal, a second hall signal terminal, and a third hall signal terminal for outputting a hall signal. To be equipped.

(Electrical cover 14)
The electrical cover 14 is a bottomed cylindrical cover having a bottom portion at the rear end in the axial direction. The electrical cover 14 covers the circuit board 15 in a state of being fitted and fixed to the motor housing 13. The electrical cover 14 includes a connector 14a. An external connector for electrically connecting an external device and an external power supply to each terminal of the circuit board 15 and a U-phase terminal, a V-phase terminal, and a W-phase terminal as a power input terminal of the motor 11 is inserted into the connector 14a. Is done.

<Pump unit 40>
The pump unit 40 is located on one side (front side) in the axial direction with respect to the motor unit 10. The pump unit 40 is driven by the motor unit 10 via the shaft 12. The pump unit 40 includes a pump rotor 47 and a pump body 51. The pump body 51 includes a first body 57 and a second body 52. In the pump unit 40, the first body 57 is arranged on the front side in the axial direction with respect to the second body 52. Hereinafter, each component will be described in detail.

(Pump rotor 47)
The pump rotor 47 is attached to the axial front side of the shaft 12 and rotates together with the shaft 12.
FIG. 3 is a perspective view showing the pump rotor 47. The pump rotor 47 includes an inner rotor 47a attached to the shaft 12 and an outer rotor 47b that surrounds the inner rotor 47a in the radial direction. The inner rotor 47a has an annular shape. The inner rotor 47a is a gear having teeth on the outer surface in the radial direction.

The end of the shaft 12 on the front side (+ X side) in the axial direction is inserted into the inner rotor 47a. The mode in which the front end of the shaft 12 is inserted into the inner rotor 47a may be insertion or press-fitting. The inner rotor 47a rotates around the axis (in the θ direction) together with the shaft 12. The shape of the outer rotor 47b is an annular shape surrounding the radial outer side of the inner rotor 47a. The outer rotor 47b is a gear having teeth on the inner side surface in the radial direction.

The inner rotor 47a and the outer rotor 47b mesh with each other, and the rotation of the inner rotor 47a causes the outer rotor 47b to rotate. That is, the rotation of the shaft 12 causes the pump rotor 47 to rotate.

Focusing on one meshing portion between the inner rotor 47a and the outer rotor 47b, the volume in the region between the meshing portions changes according to the rotational position of the pump rotor 47. The region where the volume reduction occurs in the rotation direction is the discharge side region DA of the rotor chamber (57a in FIG. 5). In the discharge side region DA, the oil between the meshing portions is pressurized, and an oil discharge force is generated toward the outside of the pump portion 40. On the other hand, the region where the volume increase occurs is the suction side region SA of the rotor chamber (57a in FIG. 5). In the suction side region SA, the oil between the meshing portions is depressurized, and the oil suction input toward the inside of the pump portion 40 occurs.

The discharge side region DA and the suction side region SA in FIG. 3 do not indicate a region in the circumferential direction of the pump rotor 47, but indicate a region centered on the central axis (J in FIG. 2). Therefore, even if the pump rotor 47 rotates, the positions of the discharge side region DA and the suction side region SA do not change.

(Pump body 51)
As shown in FIG. 2, the pump body 51 includes a first body 57 and a second body 52. Each of the substrates of the first body 57 and the second body 52 is made of, for example, a cast product made of aluminum.

(First body 57)
FIG. 4 is a perspective view showing a view from the front side of the electric oil pump 1 in a state where the first body 57 is broken in the YZ direction. The cross-sectional view shown in FIG. 2 shows the fracture surface at the position of the alternate long and short dash line in FIG. 4 from the −Y side. As shown in FIG. 4, a spool valve 65 and a check valve 66 are arranged in the first body 57.

The first sleeve 65a, which is a part of the spool valve 65, is an undercut provided on the first body 57. The spool valve 65 includes a spool valve body 65b, a coil spring 65c, and a spring receiver 65d in addition to the first sleeve 65a. The spool valve body 65b is housed in the first sleeve 65a and can reciprocate in the longitudinal direction of the sleeve. The coil spring 65c urges the spool valve body 65b in the direction of arrow α in the figure. The spring receiver 65d receives the end of the coil spring 65c in the direction opposite to the arrow α direction.

The second sleeve 66a, which is a part of the check valve 66, is an undercut provided on the first body 57. The check valve 66 includes a spherical check valve body 66b in addition to the second sleeve 66a. The check valve body 66b prevents the oil in the second sleeve 66a from moving in the direction of arrow β in the figure. The discharge side of the check valve 66 is connected to the upstream end of the discharge oil passage 57e.

FIG. 5 is a perspective view showing a view of the first body 57 from the rear side. The cross section shown in FIG. 2 shows the fracture surface at the position of the alternate long and short dash line in FIG. 5 from the −Y side in the Y-axis direction. As shown in FIG. 5, the first body 57 includes a rotor chamber 57a, a suction oil passage 57b, a discharge oil passage 57c, a central recess 57d, a front side discharge oil passage 57e, a discharge port 57f, an inflow port 57g, and a detection port 57h. , And an annular groove 57i.

The rotor chamber 57a is a perfect circular recess for accommodating the pump rotor (47 in FIG. 3). The suction oil passage 57b includes a recess 57b1 and a through hole 57b2. The recess 57b1 of the suction oil passage 57b is recessed from the bottom surface of the rotor chamber 57a toward the front side. The shape of the suction oil passage 57b is an arc shape extending in the circumferential direction about the central axis J. The through hole 57b2 of the suction oil passage 57b penetrates the first body 57 from the bottom surface of the recess 57b1 in the axial direction toward the front side. The suction oil passage 57b faces the suction side region SA shown in FIG. 3 in the axial direction.

In FIG. 5, the discharge oil passage 57c located on the + Z side of the suction oil passage 57b includes a recess 57c1 and a through hole 57c2. The recess 57c1 of the discharge oil passage 57c is recessed from the bottom surface of the rotor chamber 57a toward the front side. The shape of the discharge oil passage 57c is an arc shape extending in the circumferential direction about the central axis J. The through hole 57c2 of the discharge oil passage 57c penetrates the first body 57 from the bottom surface of the recess 57c1 in the axial direction toward the front side. The discharge oil passage 57c faces the discharge side region DA of the pump rotor 47 shown in FIG. 3 in the axial direction.

In FIG. 5, the central recess 57d is a perfect circular recess centered on the central axis J. The central recess 57d accommodates the front end of the shaft (12 in FIG. 2).

The front side drainage passage 57e includes a recess 57e1 and a through hole 57e2. The recess 57e1 of the front drainage passage 57e is arranged on the + Y side of the rotor chamber 57a, and is recessed from the rear end surface of the first body 57 toward the front side. The through hole 57e2 of the front side drainage passage 57e penetrates in the axial direction from the bottom surface of the recess 57e1 toward the front side.

Each of the discharge port 57f, the inflow port 57g, and the detection port 57h constitutes a part of the spool valve 65 shown in FIG. Although only the recess 57h1 in the detection port 57h is shown in FIG. 5, the detection port 57h also includes a through hole 57h2 as shown in FIG. The recess 57h1 of the detection port 57h is recessed from the rear end surface of the first body 57 toward the front side. The through hole 57h2 of the detection port 57h penetrates in the axial direction from the bottom surface of the recess 57h1 toward the front side.

As shown in FIG. 5, each of the inflow port 57g and the discharge port 57f is a recess recessed from the rear end surface of the first body 57 toward the front side.

The annular groove 57i is a recess that is recessed from the rear end surface of the first body 57 toward the front side. The annular groove 57i has a rotor chamber 57a, a suction oil passage 57b, a discharge oil passage 57c, a central recess 57d, a front discharge oil passage 57e, a detection port 57h, and an inflow port 57g at the rear end surface of the first body 57. , And the discharge port 57f.

As shown in FIG. 1, the center of the circle in the cylindrical motor housing 13 of the motor unit 10 and the electrical cover 14 is at the same position as the central axis J. On the other hand, in FIG. 5, the central axis J is located at the center of the circular central recess 57d. As shown in the figure, the center of the annular groove 57i is located at a position deviated from the circular center of the central recess 57d. That is, the center of the annular groove 57i of the first body 57 is located at a position deviated from the axis of the shaft 12 shown in FIG.

(Second body 52)
FIG. 6 is an exploded perspective view showing the electric oil pump 1 in a state where the pump unit 40 is disassembled. The second body 52 of the pump unit 40 is adjacent to the motor housing 13 of the motor unit 10 from the front side in the axial direction. The second body 52 includes a first communication oil passage 52a, a second communication oil passage 52b, a rear side discharge oil passage 52c, and an annular groove 52d.

The first communication oil passage 52a is a recess that is recessed from the front end surface of the second body 52 toward the rear side. The shape of the first communication oil passage 52a is an arc shape extending in the circumferential direction about the central axis J. The first communication oil passage 52a faces the suction side region SA shown in FIG. 3 in the axial direction.

In FIG. 6, the second communication oil passage 52b is a recess located on the + Z side of the first communication oil passage 52a and is recessed from the front end surface of the second body 52 toward the rear side. The shape of the second communication oil passage 52b is an arc shape extending in the circumferential direction about the central axis J. The second communication oil passage 52b faces the discharge side region DA shown in FIG. 3 in the axial direction.

As shown in FIG. 6, the rear side discharge oil passage 52c communicates with the second communication oil passage 52b. The rear side drainage passage 52c is a recess that is recessed from the front side end surface of the second body 52 toward the rear side. The shape of the rear side discharge oil passage 52c is a shape extending in the Z-axis direction from the communication portion with the second communication oil passage 52b to the + Z side.

The annular groove 52d is arranged near the outer edge of the front end surface of the second body 52 and surrounds the first oil passage 52a, the second oil passage 52b, and the rear discharge oil passage 52c.

A suction port 57j, a discharge port 57k, a detection port 57m, and a discharge port 57n are provided on the front end surface of the first body 57. The suction port 57j communicates with the through hole 57b2 of the suction oil passage 57b shown in FIG. The discharge port 57k communicates with the through hole 57c2 of the discharge oil passage 57c shown in FIG. The detection port 57m communicates with the through hole 57h2 of the detection port 57h shown in FIG. The discharge port 57n communicates with the through hole 57e2 of the front side discharge oil passage 57e shown in FIG.

In the axial direction, a separate plate 58 is arranged between the first body 57 and the second body 52. As shown in FIG. 2, the separate plate 58 is sandwiched between the first body 57 and the second body 52.

FIG. 7 is an exploded perspective view showing the electric oil pump 1 in a state where the pump unit 40 is disassembled from an angle different from that of FIG. As shown in FIGS. 6 and 7, the separate plate 58 includes a central opening 58a, a suction side opening 58b, a discharge side opening 58c, a discharge opening 58d, a first positioning hole 58e, and a second positioning hole 58f. ..

The central opening 58a is a perfect circular opening centered on the central axis J. The shaft 12 of the motor portion 10 penetrates through the central opening 58a.

The suction side opening 58b is an arc-shaped opening extending in the circumferential direction about the central axis J. The suction side opening 58b includes a suction side region (SA in FIG. 3) of the rotor chamber (57a in FIG. 5) arranged in the first body 57 and a first oil passage 52a arranged in the second body 52. It plays a role of communicating.

The discharge side opening 58c is an arc-shaped opening extending in the circumferential direction about the central axis J. The discharge side opening 58c includes a discharge side region (DA in FIG. 3) of the rotor chamber (57a in FIG. 5) arranged in the first body 57 and a second oil passage 52b arranged in the second body 52. Play the role of communicating.

The discharge opening 58d is a rectangular opening extending in the Z-axis direction. The discharge opening 58d serves to communicate the rear side discharge oil passage 52c arranged in the second body 52 and the inflow port 57g arranged in the first body 57. The roles of the first positioning hole 58e and the second positioning hole 58f will be described later.

When the pump rotor 47 rotates, external oil is sucked into the suction oil passage (57b in FIG. 5) through the suction port 57j of the first body 57, and the suction side region SA of the rotor 47 in the rotor chamber (57a in FIG. 5) To the meshing part in. Further, some oil reaches the first oil passage 52a of the second body 52 from the above-mentioned meshing portion through the suction side opening 58b of the separate plate 58. The oil in the suction oil passage (57b in FIG. 5) and the oil in the first communication oil passage 52a are directed toward the discharge side region DA of the rotor chamber (57a in FIG. 5) as the pump rotor 47 rotates. Moving. After that, the oil in the suction oil passage (57b in FIG. 5) and the oil in the first communication oil passage 52a are arranged in the first body 57 through the meshing portion of the pump rotor 47 (FIG. 5). 57c), or the second communication oil passage 52b arranged in the second body 52.

The oil in the second communication passage 52b of the second body 52 is gradually pressurized and reduced in volume as the pump rotor 47 rotates, and the discharge side region (FIG. 5) of the rotor chamber (57a in FIG. 5) is discharged. Through the meshing portion of DA) of 3, it reaches the inside of the discharge oil passage 57c of the first body 57. The oil in the discharge oil passage 57c of the first body 57 is discharged to the outside through the discharge port 57k.

The oil in the rear side discharge oil passage 52c of the second body 52 is pushed to the + Z side by the oil in the second communication oil passage 52b during normal operation (when the pressure does not rise as described later). It stays in the rear side discharge oil passage 52c.

A branch pipe from a discharge oil receiving pipe provided for an attachment target of an electric oil pump, such as a vehicle transmission, is connected to a detection port provided on the front end surface of the first body 57. When the oil pressure in the discharge oil receiving pipe is excessively increased (pressure increase), the oil pressure in the detection port 57h of the first body 57 also increases. Then, the oil in the detection port 57h moves the spool valve body 65b to the side opposite to the arrow α in FIG. 4 against the urging force of the coil spring 65c shown in FIG. The spool valve body 65b moved in this way communicates the inflow port 57g and the discharge port 57f shown in FIGS. 5 and 7. Then, the oil in the second communication passage 52b of the second body 52 shown in FIG. 6 enters the inflow port 57g of the first body 57 through the discharge opening 58d of the separate plate 58.

The oil that has entered the inflow port 57g of the first body 57 reaches the inflow side of the check valve 66 shown in FIG. 4 through the discharge port 57f, and makes the check valve body 66b opposite to the arrow β direction in FIG. Move in the direction. After that, the oil moves from the inflow side to the outflow side of the check valve 66, and then is discharged from the discharge port 57n shown in FIG. 6 via the front side discharge oil passage 57e shown in FIGS. 5 and 7. Will be done. When the oil discharge from the discharge port 57n continues, the oil pressure in the pump unit 40 decreases as a whole, and the oil discharge pressure from the discharge port 57k decreases. Then, the pressure of the oil in the discharge oil receiving pipe and the branch pipe in the attachment target such as the transmission decreases, and the spool valve body 65b shown in FIG. 4 moves in the arrow α direction by the urging force of the coil spring 65c. Then, the discharge of oil from the discharge port 57n is stopped.

Originally, the rear side drainage passage 52c of the second body 52 shown in FIG. 6 needs to be provided in an undercut state in which the second body 52 does not open toward the front side in the axial direction. It is provided as. The rear side surface of the separate plate 58 closes the opening of the rear side discharge oil passage 52c, so that the rear side discharge oil passage 52c is in the same state as the undercut. In the electric oil pump 1, since the rear side discharge oil passage 52c in the recessed state can be molded by a mold, the molding cost of the second body 52 is reduced as compared with the case of molding as an undercut. be able to.

In the axial direction, an annular second seal member 60 made of fluororesin is arranged between the second body 52 and the separate plate 58. The annular groove 52d of the second body 52 accommodates the axially rear side of the second seal member 60. In the second seal member 60, the axial rear side portion is inserted into the annular groove 52d of the second body 52, and the axial front side portion is the front end surface of the second body 52. Protrude from to the front side. When the separate plate 58 is pressed toward the second body 52 by bolting the second body 52 to the first body 57, the front side of the second seal member 60 is placed between the second body 52 and the separate plate 58. The portion is elastically deformed so as to spread in the YZ direction. Due to the elastic deformation described above, the space between the second body 52 and the separate plate 58 is sealed.

The discharge port 57f, the detection port 57h, and the front side discharge oil passage 57e of the first body 57 shown in FIG. 7 must be provided in an undercut state that does not normally open toward the rear side in the axial direction. There are, but all are provided as recesses. The front side surface of the separate plate 58 closes the openings of the discharge port 57f, the detection port 57h, and the front side discharge oil passage 57e, thereby forming the discharge port 57f, the detection port 57h, and the front side discharge oil passage 57e. Make it the same state as undercut. In the electric oil pump 1, since the discharge port 57f, the detection port 57h, and the front side discharge oil passage 57e in the recessed state can be molded by a mold, as compared with the case of molding as an undercut, The molding cost of the first body 57 can be reduced.

In the axial direction, an annular first seal member 59 made of fluororesin is arranged between the separate plate 58 and the first body 57. The annular groove 57i of the first body 57 accommodates the axially front side of the first seal member 59. In the first seal member 59, the portion on the front side in the axial direction is inserted into the annular groove 57i of the first body 57, and the portion on the rear side in the axial direction is the end face on the rear side of the first body 57. Protrude from to the rear side. When the separate plate 58 is pressed toward the first body 57 by bolting the second body 52 to the first body 57, the rear side of the first seal member 59 is between the separate plate 58 and the first body 57. The portion is elastically deformed so as to spread in the YZ direction. Due to the elastic deformation described above, the space between the separate plate 58 and the first body 57 is sealed. The diameter of the first seal member 59 is larger than the diameter of the second seal member 60. In other words, the diameter of the second seal member 60 is smaller than the diameter of the first seal member 59.

As shown in FIGS. 6 and 7, each of the first body 57 and the second body 52 has a bolt hole BH through which a bolt for bolting to an attachment target such as a transmission is passed. Three flanges are provided. Further, the separate plate 58 also has three bolt holes BH for passing the above-mentioned bolts.

As shown in FIG. 6, each of the axially front end surface of the first body 57 and the front side surface of the flange portion of the first body 57 is a flat flat surface without unevenness. In the electric oil pump 1, the front surface of the flange portion of the first body 57 is a mounting surface that is closely attached to the surface to be mounted. On the premise that the surface to be mounted is provided with a circular opening or recess for inserting a portion (protruding portion) protruding from the front side surface to the front side of the flange portion of the first body 57. The electric oil pump 1 is designed. The electric oil pump 1 in which the above-mentioned protruding portion is inserted into the circular opening or recess of the mounting target brings the end face on the front side in the axial direction into close contact with the connection plane arranged inside the mounting target. The connection plane described above includes an opening for communicating with the suction port 57j, an opening for communicating with the discharge port 57k, an opening for communicating with the detection port 57m (the port of the branch pipe described above), and a discharge port. An opening for communicating with 57n is provided.

When the electric oil pump 1 is bolted to the attachment target, each of the suction port 57j, the discharge port 57k, the detection port 57m, and the discharge port 57n of the first body 57 communicate with the openings provided in the connection plane of the attachment target. ..

The end face of the first body 57 on the front side in the axial direction is a flat flat surface as described above. Therefore, in order to bolt the first body 57 and the second body 52 with the separate plate 58 interposed therebetween, it is efficient to perform the following operations. That is, first, the motor portion 10 is fixed to the rear side in the axial direction of the second body 52. Next, after setting the annular second seal member 60 in the annular groove 52d of the second body 52, the workbench is set on the first body 57 with the end face on the front side in the axial direction facing downward in the vertical direction. Put on top. Then, after setting the annular first seal member 59 in the annular groove 57i of the first body 57, the separate plate 58 is placed on the first body 57. Finally, the motor unit 10 with the second body 52 facing downward in the vertical direction and the second body 52 are brought above the first body 57, and the surface of the second body 52 on the front side in the axial direction is displayed. Bolts are performed between the bodies in accordance with the separate plate 58 on the first body 57.

FIG. 8 is a perspective view showing the first body 57 and the separate plate 58. The end surface on the rear side in the axial direction of the first body 57 (the surface on the rear side of the flange portion) is provided with a first recess and a second recess for press-fitting the positioning pin. In the first positioning pin 61 shown in FIG. 8, the axial front side is press-fitted into the above-mentioned first recess, and the axial rear side is directed from the end surface of the first body 57 on the axial rear side to the rear side. It is a convex part that protrudes. Further, the second positioning pin 62 projects the axial rear side from the end surface of the first body 57 on the axial rear side toward the rear side in a state where the axial front side is press-fitted into the above-mentioned second recess. It is a convex part.

The operator can position the separate plate 58 when the separate plate 58 is placed on the first body 57 in the above-mentioned work of bolting the first body 57 and the second body 52. Specifically, the separate plate 58 is positioned by passing the first positioning pin 61 through the first positioning hole 58e of the separate plate 58 and the second positioning pin 62 through the second positioning hole 58f of the separate plate 58. be able to.

The second body 52 includes a first positioning recess that receives the first positioning pin 61 and a second positioning recess that receives the second positioning pin 62. The first positioning pin 61 and the second positioning pin 62 also serve as a frame allocation for positioning the second body 52 with respect to the first body 57.

<Action / effect of electric oil pump 1>
(1) The electric oil pump 1 includes a pump unit 40 and a motor unit 10 for driving the pump unit 40. The pump unit 40 includes a pump rotor 47 and a pump body 51 that houses the pump rotor 47. The pump body 51 includes a first body 57 arranged on the axial front side (one side) of the pump portion 40, and a second body 52 arranged on the axial rear side (the other side). An oil passage serving as an oil passage is provided in each of the first body 57 and the second body 52. The motor unit 10 is arranged on the rear side in the axial direction with respect to the pump unit 40. The electric oil pump 1 includes a separate plate 58 between the first body 57 and the second body 52. The separate plate 58 is provided with an opening (58b to d) for communicating the oil passage provided in the first body 57 and the oil passage provided in the second body 52.

In the electric oil pump 1, the separate plate 58 functions as an axial rear side wall in the oil passages (discharge port 57f, detection port 57h, and front side discharge oil passage 57e) of the first body 57. Further, the separate plate 58 functions as a wall on the front side in the axial direction in the oil passage (rear side discharge oil passage 52c) of the second body 52. Therefore, in the electric oil pump 1, the oil passage in the first body 57 can be provided as a recess that can be molded by the mold, and the oil passage in the second body 52 can be provided as a recess that can be molded by the mold. Become. Therefore, according to the electric oil pump 1, the increase in the molding cost of the first body 57 and the molding cost of the second body 52 is suppressed, and the oil passage having a complicated shape is formed in the first body 57 and the second body 52. It can be provided for each.

(2) The electric oil pump 1 includes an annular first seal member 59 arranged between the separate plate 58 and the first body 57. The first body 57 includes an annular groove 57i that accommodates the axially front side of the first seal member 59.

In the electric oil pump 1 having such a configuration, an annular first seal member 59 interposed between the separate plate 58 and the first body 57 seals the space between them to suppress oil leakage from the space. .. Therefore, according to the electric oil pump 1, it is possible to suppress the deterioration of the performance of the electric oil pump 1 due to the oil leakage from the interval.

(3) The electric oil pump 1 includes a rotor chamber 57a for accommodating the pump rotor 47 in the first body 57. The pump rotor 47 is housed in the rotor chamber 57a.

According to the electric oil pump 1 having such a configuration, oil leakage from the rotor chamber 57a through between the separate plate 58 and the first body 57 to the outside can be suppressed by the annular first seal member 59. Further, according to the electric oil pump 1, by arranging the rotor chamber 57a in the first body 57, the size of the second body 52 in the axial direction can be reduced.

(4) The electric oil pump 1 includes, in addition to the first seal member 59, an annular second seal member 60 arranged between the separate plate 58 and the second body 52. The second body 52 includes an annular groove 52d that accommodates the axial rear side of the second seal member 60. The diameter of the second seal member 60 is smaller than the diameter of the first seal member 59.

In the electric oil pump 1 having such a configuration, an annular second seal member 60 interposed between the separate plate 58 and the second body 52 seals the space between them to prevent oil leakage from the space. suppress. Therefore, according to the electric oil pump 1, it is possible to suppress the deterioration of the performance of the electric oil pump 1 due to the oil leakage from the interval.

Further, in the electric oil pump 1, the separate plate 58 is first placed at a position where the second seal member 60 having a diameter smaller than that of the first seal member 59 is closer to the rotor chamber 57a in the radial direction than the first seal member 59. Pressurize toward the body 57. Specifically, the above-mentioned pressurization is performed by applying the following force to the separate plate 58 by the second seal member 60 arranged radially inside the first seal member 59. That is, as shown by the arrow γ in FIG. 2, let's bend the separate plate 58 toward the first body 57 side with the first seal member 59 as a fulcrum inside in the radial direction from the first seal member 59. It is the power to do. According to the electric oil pump 1, the contact surface pressure between the separate plate 58 and the first body 57 is increased in the vicinity of the periphery of the rotor chamber 57a by the above-mentioned pressurization, so that the contact surface pressure between the separate plate 58 and the first body 57 is increased. Oil leakage from the pump can be suppressed better.

(5) In the electric oil pump 1, the second body 52 communicates with the first communication oil passage 52a communicating with the suction side region SA of the rotor chamber 57a and the second communication oil passage communicating with the discharge side region DA of the rotor chamber 57a. It includes 52b. The separate plate 58 includes a suction side opening 58b which is a first opening for communicating the suction side region SA of the rotor chamber 57a and the first communication oil passage 52a of the second body 52. Further, the separate plate 58 includes a discharge side opening 58c which is a second opening for communicating the discharge side region DA of the rotor chamber 57a and the second communication oil passage 52b of the second body 52. The first body 57 includes a suction oil passage 57b, which is a suction oil passage for sucking external oil toward the rotor chamber 57a.

According to the electric oil pump 1 having such a configuration, the oil sucked from the outside is stored in the first communication oil passage 52a through the rotor chamber 57a, and the oil discharged to the outside is stored in the second communication oil passage 52b through the rotor chamber 57a. By accommodating, the pump efficiency can be improved.

(6) In the electric oil pump 1, the first body 57 includes a discharge oil passage 57c for discharging oil to the outside. The axially front end surface of the first body 57 includes a suction port 57j communicating with the suction oil passage 57b and a discharge port 57k communicating with the discharge oil passage 57c.

In the electric oil pump 1 having such a configuration, the electric oil pump is attached to the attachment target in an attachment mode in which the axial front end surface of the first body 57 is directed to the attachment surface of the attachment target such as a transmission. Will be possible. That is, when the electric oil pump 1 is attached to the mounting target, the discharge port 57k of the electric oil pump 1 is communicated with the oil receiving port of the mounting target, and the suction port 57j of the electric oil pump 1 is connected to the oil feeding port of the mounting target. It becomes possible to communicate with. Therefore, both the piping work for communicating the discharge port 57k of the electric oil pump 1 with the oil receiving port to be attached and the piping work for communicating the suction port 57j of the electric oil pump 1 with the oil feeding port to be attached. Is omitted. Therefore, according to the electric oil pump 1, it is possible to improve the mounting workability when the electric oil pump 1 is mounted on the mounting target.

(7) The electric oil pump 1 includes a first positioning pin 61 and a second positioning pin 62 as convex portions protruding from the axial rear side end surface of the first body 57 toward the axial rear side. The separate plate 58 includes a first positioning hole 58e which is a through hole through which the first positioning pin 61 is penetrated, and a second positioning hole 58f which is a through hole through which the second positioning pin 62 is penetrated.

In the electric oil pump 1 having such a configuration, it is possible to position the separate plate 58 on the first body 57. Specifically, the separate plate 58 is positioned by passing the first positioning pin 61 and the second positioning pin 62 of the first body 57 through the first positioning hole 58e and the second positioning hole 58f of the separate plate 58. It is possible. Further, it is possible to fix the second body 52 to the first body 57 in a state where the separate plate 58 is positioned with respect to the first body 57 as described above. Therefore, according to the electric oil pump 1, it is possible to suppress the positional deviation of the separate plate 58 with respect to the first body 57 and the second body 52, and improve the connection workability between the first body 57 and the second body 52. it can.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and modifications can be made within the scope of the gist thereof. These embodiments and modifications thereof are included in the scope and gist of the invention, and at the same time, are included in the scope of claims and their equivalents described in the claims.

1: Electric oil pump 10: Motor part 11: Motor 12: Shaft (motor shaft)
13: Motor housing 14: Electrical cover 20: Rotor 22: Stator 40: Pump part 47: Pump rotor 51: Pump body 52: Second body 52a: First communication oil passage 52b: Second communication oil passage 52c: Rear side discharge Oil passage 52d: Circular groove 55: Bearing 57: First body 57n: Discharge port 57a: Rotor chamber (oil passage)
57b: Inhalation oil passage 57c: Discharge oil passage 57e: Front side discharge oil passage 57f: Discharge port (oil passage)
57g: Inflow port (oil passage)
57h: Detection port (oil passage)
57i: Circular groove 57j: Suction port 57k: Discharge port 58: Separate plate 58a: Center opening 58b: Suction side opening 58c: Discharge side opening 58d: Discharge opening 58e: First positioning hole (through hole)
58f: Second positioning hole (through hole)
59: 1st seal member 60: 2nd seal member 61: 1st positioning pin (convex part)
62: Second positioning pin (convex part)
65: Spool valve 65a: First sleeve 65b: Spool valve body 65c: Coil spring 65d: Spring receiver 66: Check valve 66a: Second sleeve 66b: Check valve body

Claims (7)

A pump unit and a motor unit for driving the pump unit are provided.
The pump unit includes a pump rotor and a pump body that houses the pump rotor.
The pump body includes a first body arranged on one side of the pump body in the axial direction of the motor unit, and a second body arranged on the other side in the axial direction of the pump body.
An oil passage serving as an oil passage is provided in each of the first body and the second body.
An electric oil pump in which the motor unit is arranged on the other side in the axial direction from the pump unit.
A separate plate is provided between the first body and the second body.
The separate plate includes an opening for communicating the oil passage provided in the first body and the oil passage provided in the second body.
Electric oil pump. An annular sealing member arranged between the separate plate and the first body is provided.
The first body includes an annular groove that accommodates one side of the seal member in the axial direction.
The electric oil pump according to claim 1. A rotor chamber for accommodating the pump rotor is provided in the first body.
The pump rotor is housed in the rotor chamber.
The electric oil pump according to claim 2. In addition to the first sealing member as the sealing member, an annular second sealing member arranged between the separate plate and the second body is provided.
The second body includes an annular groove that accommodates the other side of the second seal member in the axial direction.
The diameter of the second seal member is smaller than the diameter of the first seal member.
The electric oil pump according to claim 3. The second body includes a first oil passage that communicates with the suction side region of the rotor chamber and a second oil passage that communicates with the discharge side region of the rotor chamber.
The separate plate has a first opening for communicating the suction side region of the rotor chamber with the first oil passage, and a second opening for communicating the discharge side region of the rotor chamber with the second oil passage. Prepare,
The first body comprises a suction oil passage for sucking external oil toward the rotor chamber.
The electric oil pump according to claim 4. The first body includes a discharge oil passage for discharging oil to the outside.
One end surface of the first body in the axial direction includes a suction port communicating with the suction oil passage and a discharge port communicating with the discharge oil passage.
The electric oil pump according to claim 5. A plurality of convex portions projecting from the other end surface in the axial direction of the first body toward the other side in the axial direction are provided.
The separate plate comprises a plurality of through holes for individually penetrating each of the plurality of protrusions.
The electric oil pump according to any one of claims 1 to 6.

Images