CN212155139U - Electric oil pump - Google Patents

Abstract

The utility model provides an electric oil pump (1), the increase of the shaping cost of the 1 st main part (57) and the shaping cost of the 2 nd main part (52) that can restrain the pump body to can set up the oil circuit of complicated shape respectively in the 1 st main part (57) and the 2 nd main part (52). A partition plate (58) is provided between the 1 st body (57) and the 2 nd body (52), and the partition plate (58) has openings (58 b-d) that communicate an oil passage provided in the 1 st body (57) with an oil passage provided in the 2 nd body (52). The partition plate (58) functions as a wall provided on the rear side in the axial direction of the oil passage of the 1 st body (57), and functions as a wall provided on the front side in the axial direction of the oil passage of the 2 nd body (52). Therefore, the oil passage provided in the 1 st body 57 and the oil passage provided in the 2 nd body 52 can be recessed portions recessed in the axial direction.

Description

Electric oil pump

Technical Field

The utility model relates to an electric oil pump.

Background

Conventionally, there are known electric oil pumps as follows: the pump body of the pump section includes: a 1 st body disposed on one axial side of the motor unit; and a 2 nd body disposed on the other side in the axial direction, and oil passages as oil passages are provided in the 1 st body and the 2 nd body, respectively.

For example, an electric oil pump described in patent document 1 includes a pump cover as a 1 st body and a pump housing as a 2 nd body as a pump body of a pump section. The pump housing is disposed on the other axial side of the pump housing. The motor portion of the electric oil pump is disposed on the other axial side of the pump portion. The pump housing is provided with a housing recess serving as an oil passage, and the pump rotor is housed in the housing recess. The pump cover is provided with a suction chamber, a suction port, a discharge chamber, and a discharge port as an oil passage. The suction chamber communicates with a suction-side region of the housing recess portion of the pump housing, and a suction port through which external oil is sucked communicates with the suction chamber. The discharge chamber communicates with a discharge-side region of the housing recess of the pump housing, and a discharge port that discharges oil to the outside communicates with the discharge chamber.

Patent document 1: japanese laid-open patent publication No. 2015-163029

In the electric oil pump described in patent document 1, if the suction port and the discharge port provided in the pump cover are designed to be ports having more complicated shapes, the molding cost of the pump housing increases. Specifically, the suction chamber and the discharge chamber provided in the pump cover are recesses that open toward the housing recess of the pump housing. When the pump cover is molded by a mold such as a die, the suction port and the discharge port as the concave portions are molded simultaneously by the die (the mold for cover molding). On the other hand, the suction port and the discharge port are undercut grooves (hollow portions) provided inside the base body of the pump housing. The undercut groove is not formed by a mold for hood molding, but is formed by a collapsible core such as a sand core provided in the mold for hood molding. The more complicated the shapes of the suction port and the discharge port, the more the molding cost of the pump housing increases.

In the electric oil pump described in patent document 1, an oil passage (for example, a suction chamber) formed by an undercut groove is provided only in the pump cover, but an oil passage formed by an undercut groove may be provided in both the pump housing and the pump cover.

SUMMERY OF THE UTILITY MODEL

In view of the above background, an object of the present invention is to provide an electric oil pump capable of suppressing an increase in molding cost of the 1 st body and an increase in molding cost of the 2 nd body and capable of providing oil passages of complicated shapes in the 1 st body and the 2 nd body, respectively.

An exemplary utility model of aspect 1 of the present application is an electric oil pump having: a pump section; and a motor unit that drives the pump unit, the pump unit including a pump rotor and a pump body that houses the pump rotor, the pump body including: a 1 st body disposed on one side of the pump body in an axial direction of the motor unit; and a 2 nd body disposed on the other axial side of the pump body, oil passages as oil passages being provided in the 1 st body and the 2 nd body, respectively, and the motor section being disposed on the other axial side of the pump section, wherein a partition plate having an opening for communicating the oil passage provided in the 1 st body with the oil passage provided in the 2 nd body is provided between the 1 st body and the 2 nd body.

Preferably, the electric oil pump includes an annular seal member disposed between the partition plate and the 1 st body, and the 1 st body includes an annular groove that accommodates one axial side of the seal member.

Preferably, the electric oil pump has a rotor chamber in the 1 st main body, the rotor chamber accommodating the pump rotor, and the pump rotor is accommodated in the rotor chamber.

Preferably, the electric oil pump further includes an annular 2 nd seal member in addition to the 1 st seal member as the seal member, the 2 nd seal member being disposed between the separator and the 2 nd body, the 2 nd body having an annular groove for accommodating the other axial side of the 2 nd seal member, and the 2 nd seal member having a diameter smaller than that of the 1 st seal member.

Preferably, the 2 nd body has: a 1 st communication oil passage that communicates with a suction side region of the rotor chamber; and a 2 nd communication oil passage that communicates with a discharge side region of the rotor chamber, the partition plate having: a 1 st opening that communicates a suction side region of the rotor chamber with the 1 st communication oil passage; and a 2 nd opening that communicates a discharge side region of the rotor chamber with the 2 nd communication oil passage, the 1 st main body having a suction oil passage that sucks external oil toward the rotor chamber.

Preferably, the 1 st body has an oil discharge passage for discharging oil to the outside, and one axial end surface of the 1 st body includes: a suction port communicating with the suction oil passage; and a discharge port communicating with the discharge oil passage.

Preferably, the electric oil pump includes a plurality of convex portions protruding from the other end surface in the axial direction of the 1 st main body toward the other end surface in the axial direction, and the separator includes a plurality of through holes through which the plurality of convex portions individually penetrate.

According to the exemplary embodiment 1 of the present application, the increase in the molding cost of the 1 st body and the molding cost of the 2 nd body can be suppressed, and the oil passages having complicated shapes can be provided in the 1 st body and the 2 nd body, respectively.

Drawings

Fig. 1 is a perspective view illustrating an electric oil pump of an embodiment.

Fig. 2 is a longitudinal sectional view showing a sectional surface at a position of a central axis J of the electric oil pump.

Fig. 3 is a perspective view showing a pump rotor of a pump portion of the electric oil pump.

Fig. 4 is a perspective view showing the electric oil pump in a state where the 1 st main body of the pump section is cut in the Y-Z direction as viewed from the front side.

Fig. 5 is a perspective view showing the 1 st body viewed from the rear side.

Fig. 6 is an exploded perspective view of the electric oil pump showing a state in which the pump section is exploded.

Fig. 7 is an exploded perspective view of the electric oil pump showing a state in which the pump section is exploded from a different angle from fig. 6.

Fig. 8 is a perspective view showing the 1 st body and the partition plate of the electric oil pump.

Description of the reference symbols

1: an electric oil pump; 10: a motor section; 11: a motor; 12: a shaft (motor shaft); 13: a motor housing; 14: an electric fitting cover; 20: a rotor; 22: a stator; 40: a pump section; 47: a pump rotor; 51: a pump body; 52: a 2 nd body; 52 a: the 1 st communicating oil way; 52 b: the 2 nd communication oil way; 52 c: a rear-side discharge oil path; 52 d: a circular groove; 55: a bearing; 57: a 1 st body; 57 n: an outlet port; 57 a: a rotor chamber (oil path); 57 b: a suction oil path; 57 c: discharging an oil path; 57 e: a front side discharge oil path; 57 f: a discharge port (oil path); 57 g: an inflow port (oil passage); 57 h: a detection port (oil passage); 57 i: a circular groove; 57 j: a suction inlet; 57 k: an outlet port; 58: a partition plate; 58 a: a central opening; 58 b: the suction side is open; 58 c: a discharge side opening; 58 d: an opening for discharge; 58 e: 1 st positioning hole (through hole); 58 f: 2 nd positioning hole (through hole); 59: 1 st sealing member; 60: a 2 nd seal member; 61: 1 st dowel (boss); 62: 2 nd positioning pin (convex portion); 65: a spool valve; 65 a: 1, a sleeve; 65 b: a spool valve body; 65 c: a coil spring; 65 d: a spring bearing body; 66: a check valve; 66 a: a 2 nd sleeve; 66 b: a check valve body.

Detailed Description

Hereinafter, an electric oil pump according to an embodiment of the present invention will be described with reference to the drawings. In the drawings below, for convenience of understanding of the respective structures, the actual structures may be different in scale, number, and the like from those of the respective structures.

In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the X-axis direction is a direction parallel to the axial direction of the central axis J shown in fig. 1 and 2. The Y-axis direction is a direction parallel to the short side direction of the electric oil pump shown in fig. 1. The Z-axis direction is a direction perpendicular to both the X-axis direction and the Y-axis direction.

In the following drawings, when arrows are drawn along the X-axis direction, the Y-axis direction, and the Z-axis direction, the side to which the arrow is directed is the + side, and the side to which the arrow is not directed is the-side.

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 only names for explanation, and do not limit the actual positional relationship and direction. The axial front side is equivalent to the axial side of the utility model. The axial rear side is equivalent to the axial opposite side of the utility model.

Unless otherwise specified, a direction parallel to the central axis J (X-axis direction) is simply referred to as "axial direction", a radial direction about the central axis J is simply referred to as "radial direction", and a circumferential direction about the central axis J (i.e., a direction around the central axis J) (θ direction) is simply referred to as "circumferential direction".

In addition, in the present specification, "extend in the axial direction" includes a case of extending in a direction inclined in a range of less than 45 ° with respect to the axial direction, in addition to a case of strictly extending in the axial direction (X-axis direction). In addition, in this specification, "extend in the radial direction" includes, in addition to a case of extending strictly in the radial direction (i.e., a direction perpendicular to the axial direction (X-axis direction)), a case of extending in a direction inclined in a range of less than 45 ° with respect to the radial direction.

< integral Structure >

Fig. 1 is a perspective view showing an electric oil pump 1 of the embodiment. As shown in the drawing, the electric oil pump 1 includes a motor portion 10 and a pump portion 40.

Fig. 2 is a longitudinal sectional view showing a sectional surface at a position of the central axis J of the electric oil pump 1. The central axis J is an axis along the axial center of the shaft 12 (motor shaft) of the motor 11 included in the motor unit 10. The motor unit 10 includes a shaft 12 disposed along a central axis J extending in the axial direction. The pump section 40 is located on one axial side (front side) of the motor section 10, and draws and discharges oil when driven by the motor section 10 via the shaft 12. Hereinafter, each structural member will be described in detail.

< motor part 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 electric component 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 outward of the rotor 20.

(Motor case 13)

The motor housing 13 is made of metal. The motor case 13 has a bottomed cylindrical shape having a bottom portion 13f on the other side (rear side) in the axial direction. The inner circumferential surface of the motor housing 13 extending in the circumferential direction functions as a stator holding portion that holds the stator 22. An outer surface of the stator 22 (i.e., an outer surface of a core back 22a described later) is fitted to an inner peripheral surface of the motor housing 13. The stator 22 is fitted and housed in the motor housing 13 as described above.

(rotor 20)

The rotor 20 has a rotor core 20a and a rotor magnet 20 b. Rotor core 20a surrounds shaft 12 around the axis (θ direction) and is fixed to shaft 12. Rotor magnet 20b is fixed to an outer surface of rotor core 20a around the axis (in the 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 in the rotor 20. The embedded magnet type rotor 20 can reduce the possibility of the magnets being separated by centrifugal force and can actively utilize reluctance torque, as compared with the surface magnet type in which permanent magnets are provided on the surface of the rotor 20.

(stator 22)

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

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

(shaft 12)

The shaft 12 extends along the center axis J and penetrates the motor unit 10. The front side (+ X side) of the shaft 12 protrudes from the motor section 10 and extends into the pump section 40. The front side in the axial direction of the shaft 12 is rotatably supported by a bearing 55 described later in the pump section 40. The rear side in the axial direction of the shaft 12 is rotatably supported by a bearing 24 disposed at the rear side in the axial direction of the rotor 20. Therefore, the shaft 12 is supported at both ends.

(Circuit board 15)

The circuit board 15 is fixed to the outer surface of the bottom portion 13f of the motor housing 13. A hall IC for a hall sensor that detects the rotation angles of the shaft 12 and the rotor 20, and the like are mounted on the circuit board 15. In addition, the circuit board 15 has a power supply terminal for supplying power to the hall sensor, a GND terminal, and a 1 st hall signal terminal, a 2 nd hall signal terminal, and a 3 rd hall signal terminal for outputting hall signals.

(Electrical fitting cover 14)

The electric component cover 14 is a bottomed cylindrical cover having a bottom at an end portion on the rear side in the axial direction. The electric cover 14 covers the circuit board 15 in a state of being fitted and fixed to the motor housing 13. The electrical enclosure 14 has a connector 14 a. The connector 14a is inserted with an external connector for electrically connecting an external device and an external power source to the respective terminals of the circuit board 15 and the U-phase terminal, the V-phase terminal, and the W-phase terminal of the motor 11 as power input terminals.

< Pump part 40 >

The pump section 40 is located on one axial side (front side) of the motor section 10. The pump section 40 is driven by the motor section 10 via the shaft 12. The pump section 40 has a pump rotor 47 and a pump body 51. The pump body 51 has a 1 st body 57 and a 2 nd body 52. In the pump section 40, the 1 st body 57 is disposed on the axial front side of the 2 nd body 52. Hereinafter, each member will be described in detail.

(Pump rotor 47)

The pump rotor 47 is mounted on the front side in the axial direction 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 has: an inner rotor 47a attached to the shaft 12; and an outer rotor 47b surrounding a radially outer side of the inner rotor 47 a. The inner rotor 47a has an annular shape. The inner rotor 47a is a gear having teeth on the radially outer side.

The end of the shaft 12 on the axial front side (+ X side) enters the inside of the inner rotor 47 a. The front end of the shaft 12 may be inserted or press-fitted into the inner rotor 47 a. The inner rotor 47a rotates together with the shaft 12 about the axis (θ direction). The outer rotor 47b is annular in shape surrounding the radially outer side of the inner rotor 47 a. The outer rotor 47b is a gear having teeth on the radially inner side.

The inner rotor 47a and the outer rotor 47b are engaged with each other, and the outer rotor 47b is rotated by rotating the inner rotor 47 a. That is, the pump rotor 47 is rotated by the rotation of the shaft 12.

If attention is paid to 1 meshing portion of the inner rotor 47a and the outer rotor 47b, the volume of the region between the meshing portions varies depending on 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 (57 a of fig. 5). In the discharge-side region DA, the oil between the meshing portions is pressurized, thereby generating a discharge force of the oil toward the outside of the pump portion 40. On the other hand, the region where the volume increase is generated is the suction side region SA of the rotor chamber (57 a of fig. 5). In the suction side area SA, the oil between the mesh portions is decompressed, thereby generating a suction force of the oil toward the inside of the pump portion 40.

The discharge-side region DA and the suction-side region SA in fig. 3 do not indicate a circumferential region of the pump rotor 47, but indicate regions centered on the central axis (J in fig. 2). Thus, even when the pump rotor 47 rotates, the positions of the discharge-side area DA and the suction-side area SA do not change.

(Pump body 51)

As shown in fig. 2, the pump body 51 has a 1 st body 57 and a 2 nd body 52. The base of each of the 1 st body 57 and the 2 nd body 52 is made of, for example, a cast product of aluminum.

(1 st body 57)

Fig. 4 is a perspective view showing the electric oil pump 1 in a state where the 1 st main body 57 is cut in the Y-Z direction as viewed from the front side. The cross-sectional view shown in fig. 2 shows a cross-sectional view at the position of the one-dot chain line of fig. 4 from the-Y side. As shown in fig. 4, a spool 65 and a check valve 66 are disposed in the 1 st body 57.

The 1 st sleeve 65a, which is a part of the spool 65, is an undercut groove provided to the 1 st body 57. The spool 65 includes a spool body 65b, a coil spring 65c, and a spring receiving body 65d in addition to the 1 st sleeve 65 a. The spool body 65b is housed in the 1 st sleeve 65a and is capable of reciprocating in the sleeve longitudinal direction. The coil spring 65c biases the spool valve body 65b in the direction of arrow α in the figure. The spring receiving body 65d receives an end portion of the coil spring 65c in the direction opposite to the arrow α direction.

The 2 nd sleeve 66a, which is a part of the check valve 66, is an undercut groove provided to the 1 st body 57. The check valve 66 has a check valve body 66b of a regular spherical shape in addition to the 2 nd sleeve 66 a. The check valve body 66b prevents the oil in the 2 nd 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 57 e.

Fig. 5 is a perspective view showing the 1 st body 57 viewed from the rear side. The cross section shown in fig. 2 shows a cross-sectional surface at the position of the chain line of fig. 5 from the-Y side in the Y-axis direction. As shown in fig. 5, the 1 st body 57 has a rotor chamber 57a, a suction oil passage 57b, a discharge oil passage 57c, a center recess 57d, a front side discharge oil passage 57e, a discharge port 57f, an inflow port 57g, a detection port 57h, and an annular groove 57 i.

The rotor chamber 57a is a circular recess that houses the pump rotor (47 in fig. 3). The suction oil passage 57b has a recess 57b1 and a through hole 57b 2. The recessed portion 57b1 of the suction oil passage 57b is recessed toward the front side from the bottom surface of the rotor chamber 57 a. The shape of the suction oil passage 57b is an arc shape extending in the circumferential direction with the center axis J as the center. The through hole 57b2 of the suction oil passage 57b axially penetrates the 1 st body 57 from the bottom surface of the recessed portion 57b1 toward the front side. The intake oil passage 57b axially faces the intake-side region SA shown in fig. 3.

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 57c 2. The concave portion 57c1 of the discharge oil passage 57c is recessed toward the front side from the bottom surface of the rotor chamber 57 a. The shape of the discharge oil passage 57c is an arc shape extending in the circumferential direction with the center axis J as the center. The through hole 57c2 of the discharge oil path 57c axially penetrates the 1 st body 57 from the bottom surface of the recess 57c1 toward the front side. The discharge oil passage 57c axially faces the discharge side region DA of the pump rotor 47 shown in fig. 3.

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

The front side discharge oil passage 57e has a recess 57e1 and a through hole 57e 2. The recess 57e1 of the front side discharge oil passage 57e is disposed on the + Y side of the rotor chamber 57a, and is recessed from the rear end surface of the 1 st main body 57 toward the front side. The through hole 57e2 of the front side discharge oil passage 57e axially penetrates from the bottom surface of the recess 57e1 toward the front side.

The discharge port 57f, the inflow port 57g, and the detection port 57h each constitute a part of the spool valve 65 shown in fig. 4. In fig. 5, only the recess 57h1 of the detection port 57h is shown, but as shown in fig. 2, the detection port 57h further has a through hole 57h 2. The recess 57h1 of the detection port 57h is recessed from the end surface on the rear side of the 1 st body 57 toward the front side. The through hole 57h2 of the detection port 57h axially penetrates from the bottom surface of the recess 57h1 toward the front side.

As shown in fig. 5, the inflow port 57g and the discharge port 57f are recessed portions that are recessed from the end surface on the rear side of the 1 st body 57 toward the front side, respectively.

The annular groove 57i is a recess recessed from the rear end surface of the 1 st body 57 toward the front side. The annular groove 57i surrounds the rotor chamber 57a, the suction oil passage 57b, the discharge oil passage 57c, the center recess 57d, the front discharge oil passage 57e, the detection port 57h, the inflow port 57g, and the discharge port 57f on the rear end surface of the 1 st main body 57.

As shown in fig. 1, the circular centers of the cylindrical motor case 13 and the electric cover 14 of the motor unit 10 are located at the same position as the center axis J. On the other hand, in fig. 5, the center axis J is located at the circular center of the circular central recess 57 d. As shown in the drawing, the center of the annular groove 57i is located at a position deviated from the circular center of the central recess 57 d. That is, the center of the annular groove 57i of the 1 st body 57 is located at a position deviated from the axis of the shaft 12 shown in fig. 2.

(2 nd body 52)

Fig. 6 is an exploded perspective view of the electric oil pump 1 showing a state in which the pump section 40 is exploded. The 2 nd main body 52 of the pump section 40 is adjacent to the motor case 13 of the motor section 10 from the front side in the axial direction. The 2 nd main body 52 has a 1 st communication oil passage 52a, a 2 nd communication oil passage 52b, a rear side discharge oil passage 52c, and an annular groove 52 d.

The 1 st communication oil passage 52a is a recessed portion recessed from the front end surface of the 2 nd main body 52 toward the rear side. The 1 st communication oil passage 52a has an arc shape extending in the circumferential direction around the central axis J. The 1 st communication oil passage 52a axially faces the suction-side region SA shown in fig. 3.

In fig. 6, the 2 nd communication oil passage 52b is located on the + Z side of the 1 st communication oil passage 52a, and is a recessed portion recessed from the front end surface of the 2 nd main body 52 toward the rear side. The 2 nd communication oil passage 52b has an arc shape extending in the circumferential direction around the central axis J. The 2 nd communication oil passage 52b axially faces the discharge side region DA shown in fig. 3.

As shown in fig. 6, the rear side discharge oil passage 52c communicates with the 2 nd communication oil passage 52 b. The rear side discharge oil passage 52c is a recess recessed from the front side end surface of the 2 nd main body 52 toward the rear side. The rear side discharge oil passage 52c has a shape extending in the Z axis direction from the communication portion with the 2 nd communication oil passage 52b to the + Z side.

The annular groove 52d is disposed near the outer edge of the front end surface of the 2 nd body 52 and surrounds the 1 st communication oil passage 52a, the 2 nd communication oil passage 52b, and the rear discharge oil passage 52 c.

An intake port 57j, a discharge port 57k, a detection port 57m, and a discharge port 57n are provided on the front end surface of the 1 st body 57. The suction port 57j communicates with the through hole 57b2 of the suction oil passage 57b shown in fig. 5. The discharge port 57k communicates with the through hole 57c2 of the discharge oil path 57c shown in fig. 5. The detection port 57m communicates with the through hole 57h2 of the detection port 57h shown in fig. 2. The discharge port 57n communicates with the through hole 57e2 of the front side discharge oil passage 57e shown in fig. 5.

A partition plate 58 is disposed between the 1 st body 57 and the 2 nd body 52 in the axial direction. As shown in fig. 2, the partition 58 is sandwiched between the 1 st body 57 and the 2 nd body 52.

Fig. 7 is an exploded perspective view of the electric oil pump 1 showing a state in which the pump section 40 is exploded from a different angle from fig. 6. As shown in fig. 6 and 7, the partition plate 58 has a center opening 58a, a suction-side opening 58b, a discharge-side opening 58c, a discharge opening 58d, a 1 st positioning hole 58e, and a 2 nd positioning hole 58 f.

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

The suction-side opening 58b is an arc-shaped opening extending in the circumferential direction around the central axis J. The suction-side opening 58b functions as follows: the suction-side region (SA of fig. 3) of the rotor chamber (57 a of fig. 5) disposed in the 1 st body 57 is communicated with the 1 st communication oil passage 52a disposed in the 2 nd body 52.

The discharge-side opening 58c is an arc-shaped opening extending in the circumferential direction around the central axis J. The discharge-side opening 58c functions as follows: the discharge side region (DA in fig. 3) of the rotor chamber (57 a in fig. 5) disposed in the 1 st body 57 is communicated with the 2 nd communication oil passage 52b disposed in the 2 nd body 52.

The discharge opening 58d is a rectangular opening extending in the Z-axis direction. The discharge opening 58d functions as follows: the rear side discharge oil passage 52c disposed in the 2 nd main body 52 communicates with the inflow port 57g disposed in the 1 st main body 57. The function of the 1 st positioning hole 58e and the 2 nd positioning hole 58f will be described later.

When the pump rotor 47 rotates, the external oil is sucked into the suction oil passage (57 b in fig. 5) through the suction port 57j of the 1 st main body 57, and reaches the meshing portion of the suction side area SA of the rotor 47 in the rotor chamber (57 a in fig. 5). Further, a part of the oil passes through the suction-side opening 58b of the partition plate 58 from the meshing portion and reaches the 1 st communication oil passage 52a of the 2 nd main body 52. The oil in the suction oil passage (57 b in fig. 5) and the oil in the 1 st communication oil passage 52a move toward the discharge side area DA of the rotor chamber (57 a in fig. 5) as the pump rotor 47 rotates. Then, the oil in the suction oil passage (57 b in fig. 5) and the oil in the 1 st communication oil passage 52a pass through the meshing portion of the pump rotor 47, and reach the discharge oil passage (57 c in fig. 5) disposed in the 1 st body 57 or the 2 nd communication oil passage 52b disposed in the 2 nd body 52.

The oil in the 2 nd communication oil passage 52b of the 2 nd main body 52 is gradually pressurized and reduced in volume with the rotation of the pump rotor 47, and passes through the meshing portion of the discharge side region (DA of fig. 3) of the rotor chamber (57 a of fig. 5) to reach the discharge oil passage 57c of the 1 st main body 57. The oil in the discharge oil passage 57c of the 1 st body 57 passes through the discharge port 57k and is discharged to the outside.

The oil in the rear side discharge oil passage 52c of the 2 nd main body 52 is pushed to the + Z side by the oil in the 2 nd communication oil passage 52b during normal operation (when a pressure rise described later is not caused), but stays in the rear side discharge oil passage 52 c.

A branch pipe from a discharged oil receiving pipe provided in an object to which an electric oil pump such as a transmission of a vehicle is mounted is connected to a detection port provided in a front end surface of the 1 st main body 57. When the pressure of the oil in the discharge oil receiving pipe is excessively high (pressure rises), the pressure of the oil in the detection port 57h of the 1 st main body 57 also increases. Then, the oil in the detection port 57h moves the spool valve body 65b to the opposite side of the arrow α in fig. 4 against the urging force of the coil spring 65c shown in fig. 4. The spool valve body 65b thus moved communicates the inflow port 57g and the discharge port 57f shown in fig. 5 and 7. Then, the oil in the 2 nd communication oil passage 52b of the 2 nd main body 52 shown in fig. 6 passes through the discharge opening 58d of the partition plate 58 and enters the inflow port 57g of the 1 st main body 57.

The oil that has entered the inflow port 57g of the 1 st body 57 passes through the discharge port 57f, reaches the inflow side of the check valve 66 shown in fig. 4, and moves the check valve body 66b in the direction opposite to the arrow β direction in fig. 4. Then, after the oil moves from the inflow side to the outflow side of the check valve 66, the oil is discharged from the discharge port 57n shown in fig. 6 via the front side discharge oil passage 57e shown in fig. 5 and 7. If the oil is continuously discharged from the discharge port 57n, the pressure of the oil in the pump section 40 decreases as a whole, and the discharge pressure of the oil from the discharge port 57k decreases. Then, the pressure of the oil in the discharge oil receiving pipe and the branch pipe of the mounting object such as the transmission is lowered, and the spool 65b shown in fig. 4 is moved in the arrow α direction by the biasing force of the coil spring 65 c. Then, the discharge of the oil from the discharge port 57n is stopped.

The rear discharge oil passage 52c of the 2 nd main body 52 shown in fig. 6 is originally required to be provided in a state of an undercut groove that is not open toward the front side in the axial direction, but is provided as a recess as shown in the drawing. The rear surface of the partition plate 58 closes the opening of the rear discharge oil passage 52c, and the rear discharge oil passage 52c is in the same state as the undercut groove. In the electric oil pump 1, the rear side discharge oil passage 52c in the recessed state can be molded by a mold, and therefore, the molding cost of the 2 nd main body 52 can be reduced as compared with the case of molding as an undercut groove.

An annular 2 nd seal member 60 made of a fluororesin is disposed between the 2 nd body 52 and the separator 58 in the axial direction. The annular groove 52d of the 2 nd main body 52 receives the axial rear side of the 2 nd seal member 60. The 2 nd seal member 60 has a front portion in the axial direction projecting from the front end surface of the 2 nd main body 52 toward the front side in a state where the rear portion in the axial direction is fitted into the annular groove 52d of the 2 nd main body 52. When the partition plate 58 is pressed toward the 2 nd body 52 by bolt-fastening the 2 nd body 52 to the 1 st body 57, a portion of the 2 nd seal member 60 on the front side is elastically deformed so as to expand in the Y-Z direction between the 2 nd body 52 and the partition plate 58. By the above elastic deformation, the space between the 2 nd body 52 and the partition plate 58 is sealed.

The discharge port 57f, the detection port 57h, and the front side discharge oil passage 57e of the 1 st body 57 shown in fig. 7 are all provided as recesses, although they are essentially required to be provided in a state of being undercut grooves that are not open toward the rear side in the axial direction. The front surface of the partition plate 58 closes the openings of the discharge port 57f, the detection port 57h, and the front side discharge oil passage 57e, and the discharge port 57f, the detection port 57h, and the front side discharge oil passage 57e are in the same state as the undercut groove. In the electric oil pump 1, the discharge port 57f, the detection port 57h, and the front side discharge oil passage 57e in the state of the recessed portion can be molded by a mold, so that the molding cost of the 1 st main body 57 can be reduced as compared with the case of molding into an undercut groove.

An annular 1 st seal member 59 made of a fluororesin is disposed between the separator 58 and the 1 st body 57 in the axial direction. The annular groove 57i of the 1 st body 57 accommodates the axial front side of the 1 st seal member 59. The 1 st seal member 59 has a front portion in the axial direction projecting from the rear end surface of the 1 st main body 57 toward the rear side in a state where the front portion in the axial direction is fitted into the annular groove 57i of the 1 st main body 57. When the partition plate 58 is pressed toward the 1 st body 57 by bolt-fastening the 2 nd body 52 to the 1 st body 57, a portion on the rear side of the 1 st seal member 59 is elastically deformed so as to expand in the Y-Z direction between the partition plate 58 and the 1 st body 57. By the above elastic deformation, the space between the partition plate 58 and the 1 st body 57 is sealed. In addition, the 1 st seal member 59 has a larger diameter than the 2 nd seal member 60. In other words, the diameter of the 2 nd sealing member 60 is smaller than that of the 1 st sealing member 59.

As shown in fig. 6 and 7, the 1 st body 57 and the 2 nd body 52 each have 3 bolt holes BH through which bolts for bolting the 1 st body 57 and the 2 nd body 52 to an attachment object such as a transmission are passed, in each flange portion. The spacer 58 also has 3 bolt holes BH through which the bolts pass.

As shown in fig. 6, the end surface on the axial front side of the 1 st body 57 and the surface on the front side of the flange portion of the 1 st body 57 are flat surfaces having no irregularities. In the electric oil pump 1, the front surface of the flange portion of the 1 st body 57 is a mounting surface to be attached to a surface to be mounted in close contact therewith. The electric oil pump 1 is designed on the premise that a circular opening or recess into which a portion (protruding portion) protruding from the front side of the flange portion of the 1 st main body 57 toward the front side enters is provided on the surface to be mounted. In the electric oil pump 1 in which the above-described protruding portion is inserted into the circular opening or recess of the mounting object, the end surface on the axial front side is brought into close contact with the connection plane disposed inside the mounting object. 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 an opening for communicating with the discharge port 57n are provided on the above-described connection plane.

When the electric oil pump 1 is bolted to the mounting object, the suction port 57j, the discharge port 57k, the detection port 57m, and the discharge port 57n of the 1 st body 57 communicate with openings provided in a connection plane of the mounting object, respectively.

As described above, the end surface of the 1 st body 57 on the axial front side is a flat plane. Therefore, it is efficient to perform the following operation for bolt fastening of the 1 st body 57 and the 2 nd body 52 with the partition plate 58 interposed therebetween. That is, first, the motor unit 10 is fixed to the axial rear side of the 2 nd main body 52. Next, after the annular 2 nd seal member 60 is provided in the annular groove 52d of the 2 nd body 52, the 1 st body 57 with the end surface on the axial front side facing downward in the vertical direction is placed on the work table. Then, after the 1 st sealing member 59 of an annular shape is provided in the annular groove 57i of the 1 st body 57, the partition plate 58 is placed on the 1 st body 57. Finally, the motor portion 10 and the 2 nd body 52 with the 2 nd body 52 oriented vertically downward are pulled upward of the 1 st body 57, and the bolt fastening between the bodies is performed with the front surface in the axial direction of the 2 nd body 52 aligned with the partition plate 58 on the 1 st body 57.

Fig. 8 is a perspective view showing the 1 st body 57 and the partition plate 58. A 1 st recess and a 2 nd recess for press-fitting a positioning pin are provided on an axial rear end surface (rear surface of the flange portion) of the 1 st main body 57. In a state where the axial front side is press-fitted into the 1 st recessed portion, the 1 st positioning pin 61 shown in fig. 8 is a protruding portion that protrudes axially rearward from the axial rearward end surface of the 1 st body 57 toward the rear side. In a state where the axial front side is press-fitted into the above-described 2 nd recessed portion, the 2 nd positioning pin 62 is a protruding portion that protrudes axially rearward from the axial rearward end surface of the 1 st main body 57 toward the rear side.

In the above-described work of fastening the 1 st body 57 and the 2 nd body 52 by bolts, the worker can position the spacer 58 when placing the spacer 58 on the 1 st body 57. Specifically, the partition plate 58 can be positioned by passing the 1 st positioning pin 61 through the 1 st positioning hole 58e of the partition plate 58 and passing the 2 nd positioning pin 62 through the 2 nd positioning hole 58f of the partition plate 58.

In addition, the 2 nd body 52 has: a 1 st positioning recess that receives the 1 st positioning pin 61; and a 2 nd positioning recess that receives the 2 nd positioning pin 62. The 1 st positioning pin 61 and the 2 nd positioning pin 62 also function to position the 2 nd main body 52 relative to the 1 st main body 57.

< action and Effect of electric oil Pump 1 >

(1) The electric oil pump 1 includes a pump section 40 and a motor section 10 that drives the pump section 40. The pump section 40 includes a pump rotor 47 and a pump body 51 that houses the pump rotor 47. The pump body 51 has: a 1 st body 57 disposed on the axial front side (one side) of the pump section 40; and a 2 nd main body 52 disposed on the rear side (the other side) in the axial direction. Oil passages as oil passages are provided in the 1 st body 57 and the 2 nd body 52, respectively. The motor section 10 is disposed on the axial rear side of the pump section 40. The electric oil pump 1 has a partition plate 58 between the 1 st body 57 and the 2 nd body 52. The partition plate 58 has openings (58 b-d), and the openings (58 b-d) communicate the oil passage provided in the 1 st body 57 with the oil passage provided in the 2 nd body 52.

In the electric oil pump 1, the partition plate 58 functions as an axially rear wall of the oil passage (the discharge port 57f, the detection port 57h, and the front side discharge oil passage 57e) of the 1 st main body 57. The partition plate 58 functions as a wall on the axial front side of the oil passage (rear side discharge oil passage 52c) of the 2 nd main body 52. Therefore, in the electric oil pump 1, the oil passage of the 1 st main body 57 can be provided as a recess that can be molded by a mold, and the oil passage of the 2 nd main body 52 can be provided as a recess that can be molded by a mold. Thus, according to the electric oil pump 1, it is possible to provide oil passages of complicated shapes in the 1 st body 57 and the 2 nd body 52, respectively, while suppressing an increase in the molding cost of the 1 st body 57 and the molding cost of the 2 nd body 52.

(2) The electric oil pump 1 includes an annular 1 st seal member 59, and the 1 st seal member 59 is disposed between the partition plate 58 and the 1 st main body 57. The 1 st body 57 has an annular groove 57i, and the groove 57i receives the axial front side of the 1 st seal member 59.

In the electric oil pump 1 having this configuration, the annular 1 st seal member 59 interposed between the partition plate 58 and the 1 st main body 57 seals the gap, thereby suppressing oil leakage from the gap. Thus, according to the electric oil pump 1, it is possible to suppress a performance degradation of the electric oil pump 1 due to oil leakage from the gap.

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

According to the electric oil pump 1 having this configuration, oil leakage from the rotor chamber 57a to the outside through the space between the partition plate 58 and the 1 st main body 57 can be suppressed by the annular 1 st seal member 59. Further, according to the electric oil pump 1, the size of the 2 nd body 52 in the axial direction can be reduced by disposing the rotor chamber 57a in the 1 st body 57.

(4) The electric oil pump 1 includes an annular 2 nd seal member 60 in addition to the 1 st seal member 59, and the 2 nd seal member 60 is disposed between the partition plate 58 and the 2 nd main body 52. The 2 nd main body 52 has an annular groove 52d, and the groove 52d receives the axial rear side of the 2 nd seal member 60. The diameter of the 2 nd sealing member 60 is smaller than that of the 1 st sealing member 59.

In the electric oil pump 1 having this configuration, the annular 2 nd seal member 60 interposed between the partition plate 58 and the 2 nd main body 52 seals the gap, thereby suppressing oil leakage from the gap. Thus, according to the electric oil pump 1, it is possible to suppress a performance degradation of the electric oil pump 1 due to oil leakage from the gap.

In addition, in the electric oil pump 1, the 2 nd seal member 60 having a smaller diameter than the 1 st seal member 59 pressurizes the partition plate 58 toward the 1 st body 57 at a position radially closer to the rotor chamber 57a than the 1 st seal member 59. Specifically, the 2 nd seal member 60 disposed radially inward of the 1 st seal member 59 applies the following force to the separator 58, thereby performing the above-described pressurization. That is, as shown by an arrow γ in fig. 2, this force causes the separator 58 to flex toward the 1 st body 57 side with the 1 st seal member 59 as a fulcrum at a position radially inward of the 1 st seal member 59. According to the electric oil pump 1, the above-described pressurization increases the contact surface pressure between the partition plate 58 and the 1 st body 57 in the vicinity of the periphery of the rotor chamber 57a, and oil leakage from between the partition plate 58 and the 1 st body 57 can be more favorably suppressed.

(5) In the electric oil pump 1, the 2 nd main body 52 has: a 1 st communication oil passage 52a that communicates with the suction side region SA of the rotor chamber 57 a; and a 2 nd communication oil passage 52b that communicates with the discharge side region DA of the rotor chamber 57 a. The partition plate 58 has a suction-side opening 58b, and the suction-side opening 58b is a 1 st opening that communicates the suction-side region SA of the rotor chamber 57a with the 1 st communication oil passage 52a of the 2 nd main body 52. The partition plate 58 has a discharge-side opening 58c, and the discharge-side opening 58c is a 2 nd opening that communicates the discharge-side region DA of the rotor chamber 57a with the 2 nd communication oil passage 52b of the 2 nd main body 52. The 1 st body 57 has a suction oil passage 57b, and the suction oil passage 57b is a suction oil passage for sucking external oil toward the rotor chamber 57 a.

According to the electric oil pump 1 having this configuration, the oil sucked from the outside is received in the 1 st communication oil passage 52a through the rotor chamber 57a, and the oil discharged to the outside is received in the 2 nd communication oil passage 52b through the rotor chamber 57a, whereby the pump efficiency can be improved.

(6) In the electric oil pump 1, the 1 st main body 57 has a discharge oil passage 57c that discharges oil to the outside. The axial front end surface of the 1 st body 57 includes: a suction port 57j communicating with the suction oil passage 57 b; and a discharge port 57k communicating with the discharge oil passage 57 c.

In the electric oil pump 1 having this configuration, the electric oil pump is mounted to a mounting object such as a transmission in such a manner that the front end surface of the 1 st body 57 in the axial direction faces the mounting surface to be mounted, and the following operation can be performed. That is, when the electric oil pump 1 is mounted to the mounting object, the discharge port 57k of the electric oil pump 1 can be made to communicate with the oil receiving port of the mounting object, and the suction port 57j of the electric oil pump 1 can be made to communicate with the oil delivery port of the mounting object. Thus, both the piping work for communicating the discharge port 57k of the electric oil pump 1 with the oil receiving port to be mounted and the piping work for communicating the suction port 57j of the electric oil pump 1 with the oil delivery port to be mounted are omitted. Therefore, according to the electric oil pump 1, the mounting workability when mounting the electric oil pump 1 to the mounting object can be improved.

(7) The electric oil pump 1 includes a 1 st positioning pin 61 and a 2 nd positioning pin 62 as protruding portions protruding from a rear end surface in the axial direction of the 1 st body 57 toward the rear side in the axial direction. The partition plate 58 has: a 1 st positioning hole 58e which is a through hole through which the 1 st positioning pin 61 passes; and a 2 nd positioning hole 58f that is a through hole through which the 2 nd positioning pin 62 passes.

In the electric oil pump 1 having this configuration, the partition plate 58 can be positioned on the 1 st main body 57. Specifically, the partition plate 58 can be positioned by inserting the 1 st positioning pin 61 and the 2 nd positioning pin 62 of the 1 st body 57 into the 1 st positioning hole 58e and the 2 nd positioning hole 58f of the partition plate 58. Further, as described above, the 2 nd body 52 can be fixed to the 1 st body 57 with the partition plate 58 positioned with respect to the 1 st body 57. Thus, according to the electric oil pump 1, the positional displacement of the partition plate 58 with respect to the 1 st body 57 and the 2 nd body 52 can be suppressed, and the workability of connecting the 1 st body 57 and the 2 nd body 52 can be improved.

While the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the present invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

Claims (7)

1. An electric oil pump, comprising:

a pump section; and

a motor section that drives the pump section,

the pump section has a pump rotor and a pump body that houses the pump rotor,

the pump body has:

a 1 st body disposed on one side of the pump body in an axial direction of the motor unit; and

a 2 nd body disposed on the other axial side of the pump body,

oil passages as oil passages are provided in the 1 st body and the 2 nd body, respectively,

the motor unit is disposed on the other axial side of the pump unit,

it is characterized in that the preparation method is characterized in that,

a partition is provided between the 1 st body and the 2 nd body,

the partition plate has an opening that communicates an oil passage provided in the 1 st body with an oil passage provided in the 2 nd body.

2. The electric oil pump according to claim 1,

the electric oil pump includes an annular seal member disposed between the separator and the 1 st main body,

the 1 st body has an annular groove for accommodating one axial side of the seal member.

3. The electric oil pump according to claim 2,

the electric oil pump has a rotor chamber in the 1 st main body that houses the pump rotor,

the pump rotor is housed in the rotor chamber.

4. The electric oil pump according to claim 3,

the electric oil pump includes an annular 2 nd seal member in addition to the 1 st seal member as the seal member, the 2 nd seal member being disposed between the partition plate and the 2 nd body,

the 2 nd body has an annular groove for receiving the other axial side of the 2 nd seal member,

the diameter of the 2 nd sealing member is smaller than that of the 1 st sealing member.

5. The electric oil pump according to claim 4,

the 2 nd body has:

a 1 st communication oil passage that communicates with a suction side region of the rotor chamber; and

a 2 nd communication oil passage that communicates with a discharge side region of the rotor chamber,

the separator has:

a 1 st opening that communicates a suction side region of the rotor chamber with the 1 st communication oil passage; and

a 2 nd opening that communicates a discharge side region of the rotor chamber with the 2 nd communication oil passage,

the 1 st body has a suction oil passage that sucks external oil toward the rotor chamber.

6. The electric oil pump according to claim 5,

the 1 st body has a discharge oil path for discharging oil to the outside,

the 1 st body has, on one axial end surface:

a suction port communicating with the suction oil passage; and

and a discharge port communicating with the discharge oil passage.

7. The electric oil pump according to any one of claims 1 to 6,

the electric oil pump has a plurality of convex portions protruding from the other end surface in the axial direction of the 1 st main body toward the other side in the axial direction,

the separator has a plurality of through holes through which the plurality of projections individually pass.

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