JP7322380B2 - electric oil pump - Google Patents

Description

The present invention relates to an electric oil pump.

2. Description of the Related Art Conventionally, an electric motor equipped with a motor section having a motor housing, a pump section having a pump housing, an intake port for sucking oil sent from the outside into the pump section, and a discharge port for discharging the oil in the pump section to the outside. Oil pumps are known.

For example, the electric oil pump described in Patent Literature 1 has a pump housing that includes an intake port for sucking oil sent from the outside into the pump portion and a discharge port for discharging the oil in the pump portion to the outside.

JP-A-2003-278670

In the electric oil pump disclosed in Patent Document 1, there is a problem that a cooling device for cooling the motor section is required in order to suppress the temperature rise of the motor section due to the energization of the coil.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an electric oil pump capable of suppressing a temperature rise of a motor portion without using a dedicated cooling device for cooling the motor portion.

An exemplary first invention of the present application includes a motor section including a motor housing, a pump section including a pump housing, an intake port for sucking oil sent from the outside into the pump section, and an oil in the pump section. and a discharge port that discharges oil to the outside, wherein at least one of the suction port and the discharge port is provided in the motor housing.

According to the exemplary first invention of the present application, it is possible to suppress the temperature rise of the motor section without using a dedicated cooling device for cooling the motor section.

1 is a cutaway perspective view showing a partially cutaway electric oil pump according to an embodiment; FIG. It is a perspective view which shows the part except a motor housing in the same electric oil pump, and a pump housing. It is a perspective view which shows the external appearance of the same electric oil pump. It is a schematic diagram for demonstrating the positional relationship of each surface of the same electric oil pump. It is a side view showing the rear side of the electric oil pump in the Z-axis direction. It is a perspective view which shows the external appearance of the electric oil pump which concerns on a 1st modification. It is a side view of the electric oil pump which concerns on a 2nd modification. It is a side view of the electric oil pump which concerns on a 3rd modification.

An electric oil pump according to an embodiment of the present invention will be described below with reference to the drawings. In this embodiment, an electric oil pump that supplies oil to a transmission mounted on a vehicle such as an automobile will be described. Also, in the drawings below, in order to make each configuration easier to understand, there are cases where the actual structure and each structure are different in scale, number, and the like.

Also, in the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction is parallel to the axial direction of the central axis J shown in FIG. The central axis J is the central axis of the shaft (motor shaft) 13 of the motor section 10, which will be described later. The Y-axis direction is parallel to the lateral direction of the electric oil pump shown in FIG. The X-axis direction is a direction orthogonal to both the Y-axis direction and the Z-axis direction.

Also, in the following description, the positive side in the Z-axis direction (+Z side) is referred to as the "rear side" and the negative side in the Z-axis direction (-Z side) is referred to as the "front side." Note that the terms "rear side" and "front side" are merely names used for explanation, and do not limit the actual positional relationship and direction. Further, unless otherwise specified, the direction parallel to the central axis J (the Z-axis direction) is simply referred to as the "axial direction", the radial direction about the central axis J is simply referred to as the "radial direction", and the central axis J , that is, around the central axis J (.theta. direction) is simply referred to as the "circumferential direction."

In this specification, "extending in the axial direction" means not only extending strictly in the axial direction (Z-axis direction), but also extending in a direction inclined within a range of less than 45° with respect to the axial direction. include. In addition, in this specification, extending in the radial direction means, in addition to extending in a strictly radial direction, that is, in a direction perpendicular to the axial direction (Z-axis direction), 45° with respect to the radial direction. It also includes the case where it extends in an inclined direction within the range of less than.

[Embodiment]
<Overall composition>
FIG. 1 is a partially broken perspective view of an electric oil pump according to an embodiment. An electric oil pump 1 according to the embodiment includes a motor section 10, a pump section 40, and an inverter 100, as shown in FIG. The motor section 10 includes a shaft 13 arranged along a central axis J extending in the axial direction. The pump portion 40 is positioned on one axial side (rear side) of the motor portion 10 and is driven by the motor portion 10 via the shaft 13 to discharge oil. The inverter 100 is arranged on the +X side of the motor section 10 and controls driving of the motor section 10 .

<Motor unit 10>
The motor section 10, as shown in FIG. 1, includes a shaft 13, a rotor 20, a stator 22, a motor housing 14, and a coil 22b.

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 13 , and the stator 22 is arranged radially outside the rotor 20 . The rotor 20 is fixed to the other axial side (front side) of the shaft 13 . Stator 22 is arranged to face rotor 20 .

<Pump section 40>
The pump section 40 includes a pump rotor 47 and a pump housing 51, as shown in FIG.

(Pump rotor 47)
The pump rotor 47 is attached to the rear side of the shaft 13 as shown in FIG. The pump rotor 47 includes an inner rotor 47a and an outer rotor 47b. The inner rotor 47 a is fixed to the shaft 13 . The outer rotor 47b surrounds the radially outer side of the inner rotor 47a.

The inner rotor 47a has an annular shape. The inner rotor 47a is a gear having teeth on its radial outer surface. The inner rotor 47a rotates together with the shaft 13 around the axis (in the θ direction). Part of the outer rotor 47b is not shown in FIG. 1 in order to show the fracture surface of the outer rotor 47b. The outer rotor 47b has an annular shape surrounding the radially outer side of the inner rotor 47a. The outer rotor 47b is a gear having teeth on its radial inner surface. The radial outer surface of the outer rotor 47b is circular.

The gear on the radially outer side of the inner rotor 47a and the gear on the radially inner side of the outer rotor 47b mesh with each other. That is, the rotation of the shaft 13 causes the pump rotor 47 to rotate. The motor section 10 and the pump section 40 are provided with a shaft 13 as a rotating shaft made of the same member. As a result, it is possible to prevent the electric oil pump 1 from increasing in size in the axial direction.

Further, the rotation of the inner rotor 47a and the outer rotor 47b changes the volume between the meshing portions of the inner rotor 47a and the outer rotor 47b. The area where the volume decreases becomes the pressurized area, and the area where the volume increases becomes the negative pressure area.

(Pump cover 52)
The pump housing 51 has an opening at the rear end in the Z-axis direction. This opening is closed by a pump cover 52 . Pump cover 52 is fixed to pump housing 51 with bolts 53 .

(housing)
The motor housing 14 of the motor section 10 and the pump housing 51 of the pump section 40 are part of a single member. The motor housing 14 and the pump housing 51 are made of cast metal (for example, aluminum).

The rotor accommodating portion that accommodates the pump rotor 47 of the pump portion 40 and the motor housing 14 of the motor portion 10 may be a part of a single member, or may be separate members. Also, the motor housing 14 of the motor section 10 and the pump housing 51 of the pump section 40 may be separate bodies.

When the motor housing 14 and the pump housing 51 are part of a single member like the electric oil pump 1 according to the embodiment, the boundary between the motor housing 14 and the pump housing 51 in the Z-axis direction is as follows. is defined as That is, the center in the Z-axis direction of the wall in which the through hole for passing the shaft 13 from the motor housing 14 toward the rotor accommodating portion of the pump housing 51 is provided is the boundary between the two housings in the Z-axis direction.

<Inverter 100>
The inverter 100 has an electronic substrate 101 . The electronic substrate 101 includes a plurality of electronic components 101b and a substrate 101a on which the plurality of electronic components 101b are mounted.

FIG. 2 is a perspective view showing a portion of the electric oil pump 1 excluding the motor housing 14 and the pump housing 51. As shown in FIG. The motor 11 shown in FIG. 2 is housed inside the motor housing 14 shown in FIG. A rotor 20, a stator 22, a shaft 13, etc. shown in FIG.

The inverter 100, as shown in FIG. 2, has a connector 102 that connects to an external connector leading to a power supply.

FIG. 3 is a perspective view showing the appearance of the electric oil pump 1. FIG. A plurality of cooling fins 60 are provided at the +Y-axis direction end of the motor housing 14 of the electric oil pump 1 .

A first mounting surface 23, a second mounting surface 25, a first knock pin hole 18, a first bolt hole 19, and a suction port 16 are provided on an end surface (hereinafter referred to as a side surface) of the motor housing 14 in the -Y-axis direction. . The first mounting surface 23 and the second mounting surface 25 are mounting surfaces for a transmission as an object to which the electric oil pump 1 is attached. The intake port 16 is an opening for sucking oil sent from the transmission into the pump portion 40, and is in a state of opening in the -Y-axis direction perpendicular to the Z-axis direction.

The first mounting surface 23 is provided with a first bolt hole 19 and a first knock pin hole 18 . The first bolt hole 19 is a hole through which a bolt to be screwed into a female thread provided on the transmission is passed. The first knock pin hole 18 is a hole into which a first positioning knock pin provided in the transmission is fitted.

A third mounting surface 58 , a third bolt hole 57 , a second knock pin hole 56 , and a discharge port 54 are provided on an end surface (hereinafter referred to as a side surface) of the pump housing 51 in the −Y-axis direction. The discharge port 54 is an opening through which the oil in the pump section 40 is discharged toward the transmission, and is open in the −Y-axis direction perpendicular to the Z-axis direction.

A second bolt hole 24 is provided in the second mounting surface 25 . The third mounting surface 58 is provided with a third bolt hole 57 and a second knock pin hole 56 . By fitting the first knock pin of the transmission into the first knock pin hole 18 and fitting the second knock pin of the transmission into the second knock pin hole 56 , the electric oil pump 1 is positioned with respect to the transmission. The electric oil pump 1 thus positioned is fixed to the transmission by bolts passed through the first bolt hole 19, the second bolt hole 24, and the third bolt hole 57, respectively.

FIG. 4 is a schematic diagram for explaining the positional relationship of each surface of the electric oil pump 1. As shown in FIG. In FIG. 4, reference P indicates a virtual plane extending along the Z-axis direction. As shown, a first mounting surface 23, a second mounting surface 25, a surface 17 around inlet 16 (intake peripheral plane 17) , a surface 55 around outlet 54 (outlet peripheral plane 55) , and The third mounting surface 58 is positioned on the same imaginary plane.

FIG. 5 is a side view showing the rear side of the electric oil pump 1 in the Z-axis direction. The motor housing 14 is provided with a suction passage 27 for circulating oil between the suction port 16 and the pump portion 40 . Of the entire length of the suction passage 27 , the end on the pump section 40 side is provided in the pump housing 51 . A passage sealing plug 26 is fitted into an opening provided in the side surface of the motor housing 14 for opening the intake passage 27 . In addition, as shown in FIG. 3, a passage sealing plug 26 is fitted into an opening provided in the end face of the motor housing 14 on the -X side for opening the intake passage 27 .

As shown in FIG. 5 , the pump housing 51 and the motor housing 14 are provided with a discharge passage 61 that allows oil to flow between the pump portion 40 and the discharge port 54 . After passing through the inside of the pump housing 51 and the inside of the motor housing 14 , the discharge passage 61 returns to the inside of the pump housing 51 and reaches the discharge port 54 .

A passage sealing plug 26 is fitted into an opening provided in the side surface of the motor housing 14 for opening the discharge passage 61 . In addition, as shown in FIG. 3, a passage sealing plug 59 is fitted into an opening provided in the end face of the pump housing 51 on the -X side for opening the discharge passage 61 .

The area of the inlet 16 shown in FIG. 5 is larger than the area of the outlet 54 . Also, the cross-sectional area of the suction passage 27 is larger than the cross-sectional area of the discharge passage 61 .

Next, each modified example in which a part of the configuration of the electric oil pump 1 according to the embodiment is modified to another configuration will be described. The configuration of the electric oil pump 1 according to each modification is the same as that of the embodiment unless otherwise specified.

<First modification>
FIG. 6 is a perspective view showing the appearance of the electric oil pump 1 according to the first modified example. In the electric oil pump 1 according to the first modified example, both the suction port 16 and the discharge port 28 are provided in the motor housing 14 . Note that the discharge port 28 provided in the motor housing 14 is given the reference numeral (28) different from the discharge port 54 provided in the pump housing 51 as in the embodiment.

<Second modification>
FIG. 7 is a side view of the electric oil pump 1 according to the second modified example. In the electric oil pump 1 according to the second modification, the electronic board 101 of the inverter 100 is provided in a posture extending in the Y-axis direction perpendicular to the Z-axis direction.

<Action and effect of the electric oil pump 1>
(1) The electric oil pump 1 according to the embodiment includes a motor section 10 having a motor housing 14, a pump section 40 having a pump housing 51, and a suction port for sucking oil sent from the outside into the pump section 40. 16 and. The electric oil pump 1 according to the embodiment also includes a discharge port 54 for discharging the oil in the pump portion 40 to the outside. A suction port 16 is provided in the motor housing 14 .

In such a configuration, the oil that is sucked from the suction port 16 of the motor housing 14 and then flows into the pump section 40 cools the motor section 10 whose temperature has risen due to the energization of the coil as it passes through the motor housing 14. do. Therefore, according to the electric oil pump 1 according to the embodiment, the temperature rise of the motor section 10 can be suppressed without using a dedicated cooling device for cooling the motor section 10 .

Of the suction port 16 and the discharge port 54 , only the discharge port 54 may be provided in the motor housing 14 . In such a configuration, the oil sent from the pump section 40 and then directed to the discharge port of the motor housing 14 cools the motor section 10 whose temperature has risen due to the energization of the coil when passing through the motor housing 14 .

(2) In the electric oil pump 1 according to the embodiment, the suction passage 27 that allows oil to flow between the suction port 16 and the pump portion 40 is provided inside the motor housing 14 . According to the electric oil pump 1 having such a configuration, the motor portion 10 can be cooled by the oil flowing through the suction passage 27 provided inside the motor housing 14 .

(3) In the electric oil pump 1 according to the embodiment, the area of the suction port 16 is larger than the area of the discharge port 54 . In the electric oil pump 1 having such a configuration, the suction port 16 and the discharge port 54 have different areas, so that a pressure difference is generated between the oil sucked into the suction port 16 and the oil discharged from the discharge port 54 . do. Further, in the electric oil pump 1, when the pump portion 40 operates under the condition that the required discharge pressure is obtained, the area of the suction port 16 is larger than the area of the discharge port 54, so that the areas are the same. As compared with the case, the pressure drop of the oil sucked into the suction port 16 is suppressed.

According to the electric oil pump 1 according to the embodiment, by generating a pressure difference between the oil sucked into the suction port 16 and the oil discharged from the discharge port 54, excessive discharge due to an insufficient minimum required pressure difference can be prevented. can be suppressed. Further, according to the electric oil pump 1, by suppressing the pressure drop of the oil sucked into the suction port 16, it is possible to suppress the occurrence of cavitation (bubbles in the oil) caused by the pressure drop.

(4) In the electric oil pump 1 according to the first modified example, both the suction port 16 and the discharge port 28 are provided in the motor housing 14 . Further, in the electric oil pump 1 according to the first modified example, the intake passage 27 that circulates oil between the suction port 16 and the pump portion 40 and the oil circulates between the pump portion 40 and the discharge port 28. A discharge passage is provided within the motor housing 14 . According to the electric oil pump 1 having such a configuration, the oil flowing through the suction passage 27 and the oil flowing through the discharge passage function as coolants for cooling the motor portion 10, thereby efficiently cooling the motor portion 10. can.

(5) In the electric oil pump 1 according to the first modification, the area of the suction port 16 is larger than the area of the discharge port 28, and the cross-sectional area of the suction passage 27 is greater than the cross-sectional area of the discharge passage. In the electric oil pump 1 having such a configuration, the suction port 16 and the discharge port 28 have different areas, and the suction passage 27 and the discharge passage have different cross-sectional areas. A pressure difference is generated between the oil and the oil discharged from the discharge port 28 . Further, in the electric oil pump 1, when the pump portion 40 operates under the condition that the required discharge pressure is obtained, the area of the suction port 16 is larger than the area of the discharge port 28, and the cross-sectional area of the suction passage 27 is larger than that of the discharge passage. By being larger than the cross-sectional area, the pressure drop of the sucked oil can be suppressed.

According to the electric oil pump 1 according to the first modified example, by generating a pressure difference between the oil sucked into the suction port 16 and the oil discharged from the discharge port 28, excessive discharge due to lack of the minimum required pressure difference can be prevented. occurrence can be suppressed. Further, according to the electric oil pump 1, by suppressing the pressure drop of the oil sucked into the suction port 16, it is possible to suppress the occurrence of cavitation caused by the pressure drop.

(6) In the electric oil pump 1 according to the embodiment, the motor housing 14 is provided with mounting surfaces (23, 25, 58) for the transmission to which the electric oil pump 1 is mounted. In the electric oil pump 1 having such a configuration, the motor portion 10, which is generally heavier than the pump portion 40, is provided with the mounting surface. firmly fixed to the According to the electric oil pump 1 that is firmly fixed in this manner, the vibration resistance of the electric oil pump 1 due to external disturbances can be improved compared to the configuration in which the pump portion 40 is provided with the mounting surface.

(7) In the electric oil pump 1 according to the embodiment, the surface 17 around the suction port 16, the surface 55 around the discharge port 54, and the mounting surfaces (23, 25, 58) They are located on the same imaginary plane P extending along the axial direction of the shaft 13 .

In the electric oil pump 1 having such a configuration, when the electric oil pump 1 is mounted in such a manner that the mounting surfaces (23, 25, 58) are in close contact with the mounted surface of the transmission, the surface 17 around the suction port 16 (the suction port The peripheral plane 17) and the surface 55 around the outlet 54 (the outlet peripheral plane 55) are in close contact with the mounting surface of the transmission to seal the inlet 16 and the outlet 54. As shown in FIG. That is, in the electric oil pump 1, the suction port 16 and the discharge port 54 are sealed as the electric oil pump 1 is attached to the transmission. At this time, the electric oil pump 1 is fixed to the transmission in such a posture that the Y-axis direction extends in a direction orthogonal to the mounting surface of the transmission. In the electric oil pump 1 fixed in this way, the end face opposite to the mounting surface and The distance to the surface becomes shorter. Therefore, the vibration force applied to the electric oil pump 1 becomes smaller due to the principle of levering the mounting surface of the transmission as a fulcrum and the portion opposite to the mounting surface as a force point.

According to the electric oil pump 1 according to the embodiment, since the suction port 16 and the discharge port 54 can be sealed as the electric oil pump 1 is attached to the transmission, workability of attaching the electric oil pump 1 is improved. be able to. Further, according to the electric oil pump 1, since the vibration force applied to the electric oil pump 1 in a state of being fixed to the transmission is further reduced, the vibration resistance of the electric oil pump 1 due to disturbance can be further improved. Further, according to the electric oil pump 1, the suction port 16 and the discharge port 54 can be sealed using the force of attaching the electric oil pump 1 to the transmission, so that the sealing performance can be improved.

(8) In the electric oil pump 1 according to the embodiment, the motor housing 14 also serves as part of the housing of the inverter 100, as shown in FIG. According to the electric oil pump 1 having such a configuration, the trouble of installing the inverter 100 separately from the electric oil pump 1 can be saved, and the installation workability of the electric oil pump 1 can be improved. Further, according to the electric oil pump 1, the motor housing 14 also serves as a part of the housing of the inverter 100, so that cost reduction and space saving can be achieved.

(9) In the electric oil pump 1 according to the embodiment, the electronic board 101 of the inverter 100 is provided in a posture extending in a direction slightly inclined from the Z-axis direction. In the present invention, as described above, in addition to the case of extending strictly in the axial direction (Z-axis direction), the case of extending in a direction inclined within a range of less than 45° with respect to the axial direction is also included. Therefore, in the electric oil pump 1 according to the embodiment, the electronic board 101 is provided in a posture extending in the axial direction. In the electric oil pump 1 having such a configuration, the axial area of the electric oil pump 1 , that is, the longitudinal area is used as an installation space for the electronic substrate 101 . According to the electric oil pump 1, by using the area in the longitudinal direction of the electric oil pump 1 as an installation space for the electronic substrate 101, the planar size of the electric oil pump 1 is increased by providing the inverter 100. can be suppressed.

As shown in FIG. 8, which is a side view of the electric oil pump according to the third modification, electronic board 101 of inverter 100 may be provided in a posture that extends strictly in the axial direction.

(10) In the electric oil pump 1 according to the second modification, the electronic board 101 of the inverter 100 is provided in a posture extending in the direction orthogonal to the axial direction. According to the electric oil pump 1 having such a configuration, as shown in FIG. 7, the inverter 100 is provided in the electric oil pump 1 without the inverter 100 existing around the axial center of the electric oil pump 1. can be done.

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

1: Electric oil pump 10: Motor unit 11: Motor 12: Motor cover 13: Shaft (motor shaft)
14: Motor housing 16: Suction port 17: Surface around the suction port 18: First knock pin hole 19: First bolt hole 20: Rotor 22: Stator 23: First mounting surface 24: Second bolt hole 25: Second Mounting surface 26: Passage sealing plug 27: Suction passage 28: Discharge port 40: Pump section 47: Pump rotor 47a: Inner rotor 47b: Outer rotor 51: Pump housing 52: Pump cover 53: Bolt 54: Discharge port 55: Discharge Surface around outlet 56: Second knock pin hole 57: Third bolt hole 58: Third mounting surface 59: Passage sealing plug 61: Discharge passage 100: Inverter 101: Electronic substrate 102: Connector J: Central axis

Claims (17)

a motor unit including a motor shaft axially extending along a central axis, a stator, and a motor housing accommodating the stator;
a pump section axially disposed from the motor section and including a pump housing;
a suction port for sucking oil into the pump portion from the outside;
An electric oil pump comprising a discharge port for discharging oil in the pump portion to the outside,
the suction port and the discharge port are provided on a side surface of the motor housing and open in a direction intersecting the axial direction;
The motor housing is
a passage for circulating oil between the suction port, the discharge port, and the pump unit;
an inlet peripheral plane that is a plane around the inlet;
a discharge port peripheral plane that is a surface around the discharge port;
The passage is
a suction passage provided in the motor housing for circulating oil between the suction port and the pump portion;
a discharge passage provided in the motor housing for circulating oil between the pump portion and the discharge port;
one of the suction passage and the discharge passage,
circulating oil in the axial direction between the suction port or the discharge port and the pump portion;
An electric oil pump that extends from at least the motor portion side to the pump portion side and overlaps with the stator when viewed from a direction facing the suction port peripheral plane or the discharge port peripheral plane. the other of the suction passage and the discharge passage,
circulating oil in the axial direction between the suction port or the discharge port and the pump portion;
2. The electric oil pump according to claim 1, which extends from at least the motor section side to the pump section side and overlaps with the stator when viewed from a direction facing the suction port peripheral plane or the discharge port peripheral plane. The electric oil pump according to claim 1 or 2, wherein the area of the suction port is larger than the area of the discharge port. 4. The electric oil pump according to any one of claims 1 to 3, wherein said suction port and said discharge port are arranged to be offset from each other in the axial direction when viewed from a direction intersecting the axial direction. 5. The electric oil pump according to claim 4, wherein a cross-sectional area of said suction passage is larger than a cross-sectional area of said discharge passage. 6. The electric oil pump according to any one of claims 1 to 5, wherein a mounting surface for a pump mounting body to which the electric oil pump is mounted is provided on the motor housing. 7. The electric oil according to claim 6, wherein the suction port peripheral plane, the discharge port peripheral plane, and the mounting surface are positioned on the same virtual plane extending along the axial direction of the motor shaft of the motor unit. pump. An inverter that controls driving of the motor unit,
The electric oil pump according to any one of claims 1 to 7, wherein said motor housing also serves as at least part of a housing of said inverter. 9. The electric oil pump according to claim 8, wherein the electronic board of the inverter is provided in a posture extending in the axial direction of the motor shaft of the motor section. 9. The electric oil pump according to claim 8, wherein the electronic board of the inverter is provided in a posture extending in a direction perpendicular to the axial direction of the motor shaft of the motor section. The electric oil pump according to any one of claims 1 to 10, wherein said motor housing and said pump housing are a single housing. The suction passage is
a first suction passage for circulating oil from the suction port to the pump section;
12. The second intake passage according to any one of claims 1 to 11, further comprising: a second intake passage that circulates oil from the first intake passage to the pump portion side, and circulates in a direction different from a direction in which the oil flows through the first intake passage. 1. The electric oil pump according to item 1. The discharge passage is
a first discharge passage for circulating oil from the pump portion to the discharge port side;
13. The second discharge passage according to any one of claims 1 to 12, further comprising a second discharge passage through which oil flows from said first discharge passage toward said discharge port, and through which oil flows in a direction different from a direction in which said oil flows through said first discharge passage. 1. The electric oil pump according to item 1. at least two or more of the mounting surfaces,
at least a part of one of the plurality of mounting surfaces is located closer to the end of the pump section than the flat surface surrounding the suction port or the flat surface surrounding the discharge port;
7. The electric oil pump according to claim 6, wherein at least a portion of the other of the plurality of mounting surfaces is located closer to the end portion of the motor portion than the plane surrounding the suction port or the plane surrounding the discharge port. 5. The electric oil pump according to claim 4, wherein said suction port is arranged closer to said motor unit than said discharge port. An inverter that controls driving of the motor unit,
The inverter has a connector connected to the outside,
The connector is
8. The suction port and the discharge port according to claim 6 or 7 , arranged so as not to overlap the suction port and the discharge port in a direction perpendicular to the mounting surface when viewed from a direction facing the mounting surface and extending laterally in an axial direction. electric oil pump. An inverter that controls driving of the motor unit,
The inverter has an electronic board provided in a posture extending in the axial direction of the motor shaft of the motor unit,
the inlet and the outlet and the passage,
When viewed from the direction facing the mounting surface with its axial direction extending left and right, it overlaps with the motor portion or the pump portion in a direction intersecting the mounting surface,
The electronic board is
When viewed from the direction facing the mounting surface with its axial direction extending left and right, it does not overlap the suction port and the discharge port in the direction perpendicular to the mounting surface, and is arranged radially outward of the stator. The electric oil pump according to claim 6 or 7 .

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