WO2018030373A1

WO2018030373A1 - Drive device

Info

Publication number: WO2018030373A1
Application number: PCT/JP2017/028691
Authority: WO
Inventors: 山口　康夫
Original assignee: 日本電産株式会社
Priority date: 2016-08-09
Filing date: 2017-08-08
Publication date: 2018-02-15
Also published as: WO2018030374A1; JPWO2018030375A1; CN112049792A; WO2018030375A1; WO2018030345A1; JP7010224B2; CN112049792B

Abstract

In one embodiment of this drive device, a pump unit comprises: a pump chamber which is provided in a housing; an inlet which can suck oil into the pump chamber; and an outlet which can discharge oil from inside of the pump chamber. The housing is provided with an inner lid which holds a bearing that rotatably supports a motor shaft and which covers one side of a stator in the axial direction, an outer lid which is attached to one side of the inner lid in the axial direction and which covers one side of the motor shaft in the axial direction, and an inlet oil path which connects the inlet and a vertically lower region inside of an accommodation part. The inner lid and the outer lid are separate members. At least part of the inlet oil path is arranged between the inner lid and the outer lid. The inner lid has an opening which passes through said inner lid. The opening connects the vertically lower region inside of the accommodation part and the part of the inlet oil path that is arranged between the inner lid and the outer lid. A strainer is provided in the opening.

Description

Drive device

The present invention relates to a drive device. This application is based on US Provisional Application No. 62 / 372,411 filed on Aug. 09, 2016, U.S. Provisional Application Nos. 62 / 402,027 and 12/2016 filed on Sep. 30, 2016. Claimed priority based on US Provisional Patent Application No. 62 / 439,201 filed on May 27, the contents of which are incorporated herein by reference.

A rotating electrical machine having a case for storing a lubricating fluid for lubricating and cooling the stator and the rotor is known. For example, Patent Document 1 describes a rotating electrical machine mounted on a vehicle.

JP 2013-055728 A

Rotating electric machines as described above may be provided with a pump unit that sucks up oil stored in the case. The rotor and the stator can be cooled by sucking up the oil by the pump unit and supplying the oil to the rotor and the stator, for example. Here, foreign matter such as wear powder may be generated in the case, and the foreign matter may be mixed into the oil stored in the case. In this case, foreign matter may enter the pump unit and the pump unit may be locked.

In view of the above circumstances, an object of the present invention is to provide a drive device that can suppress the intrusion of foreign matter into the pump unit.

One aspect of the drive device according to the present invention includes a rotor having a motor shaft disposed along a central axis extending in one direction and a rotor core fixed to the motor shaft, and is opposed to the rotor via a gap in a radial direction. A stator having a housing portion that houses the rotor and the stator and can store oil, a pump portion that is driven via the motor shaft, and a strainer that is attached to the housing, The pump section includes a pump chamber provided in the housing, a suction port capable of sucking oil into the pump chamber, and a discharge port capable of discharging oil from the pump chamber, and the housing includes the motor shaft. An inner lid that holds a bearing that rotatably supports the stator and covers one side in the axial direction of the stator; An outer lid part that is attached to one side in the axial direction of the inner lid part and covers one side in the axial direction of the motor shaft; a suction oil passage that connects the lower area in the vertical direction inside the housing part and the suction port; The inner lid portion and the outer lid portion are separate members, and at least a part of the suction oil passage is disposed between the inner lid portion and the outer lid portion, The lid portion has an opening that penetrates the inner lid portion, and the opening portion includes a lower region in the vertical direction inside the housing portion, and the inner lid portion and the outer lid portion of the suction oil passage. The strainer is provided in the opening.

According to one aspect of the present invention, a drive device that can suppress the entry of foreign matter into the pump unit is provided.

FIG. 1 is a cross-sectional view showing the drive device of the present embodiment. FIG. 2 is a cross-sectional view showing a part of the drive device of the present embodiment. FIG. 3 is an exploded perspective view showing the strainer of the present embodiment. FIG. 4 is a view of the pump unit of this embodiment as viewed from the other side in the axial direction. FIG. 5 is a cross-sectional view showing a part of the drive device of the present embodiment.

The Z-axis direction shown in each figure is a vertical direction Z in which the positive side is the upper side and the negative side is the lower side. In the present embodiment, the vertical direction Z is the vertical direction in FIG. In the following description, the upper side in the vertical direction is simply referred to as “upper side”, and the lower side in the vertical direction is simply referred to as “lower side”.

As shown in FIG. 1, the drive device 1 of this embodiment includes a housing 10, a strainer 100, a rotor 20 having a motor shaft 20a disposed along a central axis J1 extending in one direction, and a rotation detector 80. And a stator 30, a pump unit 40, and

bearings

70 and 71.

The central axis J1 extends in the left-right direction in FIG. That is, in the present embodiment, the left-right direction in FIG. 1 corresponds to one direction. In the following description, a direction parallel to the axial direction of the central axis J1 is simply referred to as “axial direction”, a radial direction centered on the central axis J1 is simply referred to as “radial direction”, and the central axis J1 is the center. The circumferential direction is simply called “circumferential direction”. Further, the left side of FIG. 1 in the axial direction is referred to as “one axial side”, and the right side of FIG. 1 in the axial direction is referred to as “the other axial side”.

The housing 10 has a main body part 11, an inner lid part 12, and an outer lid part 13. In the present embodiment, the main body 11, the inner lid 12, and the outer lid 13 are separate members. The main body 11 has a bottomed cylindrical shape that opens to one side in the axial direction. The main body part 11 includes a bottom part 11a, a main body cylinder part 11b, and a bearing holding part 11c. The bottom portion 11a has an annular plate shape that expands in the radial direction. The main body cylinder portion 11b has a cylindrical shape extending from the radially outer edge portion of the bottom portion 11a to one side in the axial direction. The bearing holding portion 11c has a cylindrical shape protruding from the inner edge portion of the bottom portion 11a to one side in the axial direction. The bearing holding portion 11c holds the bearing 71 on the inner peripheral surface.

The inner lid 12 is attached to one side of the main body 11 in the axial direction. The inner lid portion 12 includes an annular plate portion 12a, an outer cylinder portion 12b, an inner cylinder portion 12c, an inner cylinder bottom portion 12d, and a bearing holding portion 12e. The annular plate portion 12a has an annular plate shape that extends in the radial direction. The annular plate portion 12 a covers one side of the stator 30 in the axial direction. That is, the inner lid portion 12 covers one side of the stator 30 in the axial direction.

The outer cylinder portion 12b has a cylindrical shape extending from the radially outer edge portion of the annular plate portion 12a to the other side in the axial direction. The end portion on the other side in the axial direction of the outer tube portion 12b is fixed in contact with the end portion on the one side in the axial direction of the main body tube portion 11b. The inner cylinder portion 12c has a cylindrical shape extending from the radially inner edge of the annular plate portion 12a to the other side in the axial direction.

By the annular plate part 12a, the outer cylinder part 12b, and the inner cylinder part 12c, the inner lid part 12 is provided with a first recess 12i that is recessed from the other side in the axial direction to one side in the axial direction. That is, the inner lid part 12 has the 1st recessed part 12i. The first recess 12i has an annular shape centered on the central axis J1. The inner surface of the first recess 12i includes a radially outer surface of the inner cylinder portion 12c, a radially inner surface of the outer tube portion 12b, and a surface on the other axial side of the annular plate portion 12a. The bottom surface of the first concave portion 12i is the surface on the other side in the axial direction of the annular plate portion 12a.

The inner cylinder bottom 12d is an annular shape that extends radially inward from the other axial end of the inner cylinder 12c. Due to the inner cylinder portion 12c and the inner cylinder bottom portion 12d, the inner lid portion 12 is provided with a second recess 12g that is recessed from the surface on the one axial side of the inner lid portion 12 to the other axial side. That is, the inner lid part 12 has the 2nd recessed part 12g. In this embodiment, the surface on the one side in the axial direction of the inner lid portion 12 is the surface on the one side in the axial direction of the annular plate portion 12a. The inner side surface of the second recess 12g includes a radially inner side surface of the inner cylinder portion 12c and a surface on one axial side of the inner cylinder bottom portion 12d.

The bearing holding portion 12e has a cylindrical shape that protrudes from the surface on the other axial side of the inner cylinder bottom portion 12d to the other axial side. The bearing holding part 12e holds the bearing 70 on the inner peripheral surface. That is, the inner lid portion 12 holds the bearing 70.

The housing part 14 surrounded by the body part 11 and the inner lid part 12 is configured by fixing the body part 11 and the inner lid part 12 to each other. That is, the housing 10 has the accommodating portion 14. The accommodating portion 14 accommodates the rotor 20 and the stator 30 and can store the oil O. The oil O is stored in the lower region in the vertical direction inside the accommodating portion 14. In this specification, the “vertical lower region in the interior of the housing portion” includes a portion located below the center in the vertical direction Z within the housing portion.

In the present embodiment, the liquid surface OS of the oil O stored in the storage unit 14 is located above the opening 12f. As a result, the opening 12 f is exposed to the oil O stored in the storage portion 14. The liquid surface OS of the oil O fluctuates as the oil O is sucked up by the pump unit 40, but is disposed below the rotor 20 at least when the rotor 20 rotates. Thereby, when the rotor 20 rotates, it can suppress that the oil O becomes rotational resistance of the rotor 20. FIG.

As shown in FIGS. 1 and 2, the inner lid portion 12 has an opening 12 f that penetrates the inner lid portion 12. In the present embodiment, the opening 12f penetrates the inner lid 12 in the axial direction. The opening 12f is provided on the bottom surface of the first recess 12i, that is, the surface on the other axial side of the annular plate portion 12a. The opening part 12f penetrates the lower end part of the annular plate part 12a in the axial direction. As shown in FIG. 3, the opening 12f has, for example, a substantially rectangular shape. The opening 12 f opens in a lower region in the vertical direction inside the accommodating portion 14.

The outer lid portion 13 is attached to one side of the inner lid portion 12 in the axial direction. The outer lid portion 13 includes an outer lid main body portion 13a and a plug body portion 13b. The outer lid body 13a expands in the radial direction. The outer lid main body portion 13a includes a lid plate portion 13c and a protruding portion 13d. The lid plate portion 13c has a disk shape that expands in the radial direction. The radially outer edge portion of the lid plate portion 13c is fixed to the radially outer edge portion of the annular plate portion 12a. The surface on the other side in the axial direction of the cover plate portion 13c is in contact with the surface on the one side in the axial direction of the annular plate portion 12a. The protruding portion 13d protrudes from the center portion of the lid plate portion 13c to the other side in the axial direction. The protruding portion 13d is inserted into the inner cylinder portion 12c from one side in the axial direction. The protruding portion 13d is disposed at an interval on one side in the axial direction of the inner cylinder bottom portion 12d.

The outer lid main body 13a has a third recess 13e and a second through hole 13f. The third recess 13e is recessed from the surface on one side in the axial direction of the outer lid main body 13a to the other side in the axial direction. The 3rd recessed part 13e is provided in the center part of the outer cover main-body part 13a, and is provided ranging over the cover board part 13c and the protrusion part 13d. The second through hole 13f penetrates from the bottom surface of the third recess 13e to the other surface in the axial direction of the protruding portion 13d. That is, the second through hole 13f penetrates from the bottom surface of the third recess 13e to the inside of the housing 10. The second through hole 13f opens inside the second recess 12g. Thereby, the second through hole 13f connects the inside of the third recess 13e and the inside of the second recess 12g. The central axis J1 passes through the second through hole 13f.

The plug body portion 13b is fitted into the third recess 13e and fixed to the outer lid main body portion 13a. The plug body part 13b closes the opening on the one axial side of the third recess 13e. The plug part 13b covers one side in the axial direction of the motor shaft 20a. That is, the outer lid portion 13 covers one axial side of the motor shaft 20a. The plug body portion 13b has a flange portion 13g that protrudes radially outward at an end portion on one axial side. The flange portion 13g contacts the surface on one side in the axial direction of the lid plate portion 13c. Thereby, the plug part 13b can be positioned in an axial direction.

A pump chamber 46 is provided in the outer lid portion 13. That is, the pump chamber 46 is provided in the housing 10. The pump chamber 46 is provided between the axial direction other side surface of the plug part 13b and the bottom surface of the third recess 13e. In the present embodiment, the other axial surface of the pump chamber 46 is the bottom surface of the third recess 13e. The surface on the one axial side of the pump chamber 46 is the surface on the other axial side of the plug body portion 13b. The pump chamber 46 is an end on the other side in the axial direction of the inside of the third recess 13e. The pump chamber 46 is disposed on the radially inner side of the inner cylinder portion 12c, that is, inside the second recess 12g. The central axis J1 passes through the pump chamber 46. As shown in FIG. 4, the outer shape of the pump chamber 46 is circular when viewed in the axial direction. The pump chamber 46 accommodates an internal gear 43 and an external gear 42 which will be described later.

As shown in FIG. 1, the housing 10 has a first oil passage 61 and a suction oil passage 63. The first oil passage 61 is provided in the outer lid portion 13. More specifically, the first oil passage 61 is provided in the plug body 13b. Therefore, the configuration of the first oil passage 61 can be easily changed by replacing the plug body portion 13b. The first oil passage 61 is disposed on one axial side of the pump chamber 46. The first oil passage 61 connects the upper end portion of the pump chamber 46 and the central portion of the pump chamber 46 on one axial side of the pump chamber 46. A portion of the first oil passage 61 connected to the pump chamber 46 opens on the surface on the other axial side of the plug body portion 13b.

The upper end connected to the first oil passage 61 in the pump chamber 46 is a discharge port 45. That is, the first oil passage 61 is connected to the discharge port 45. A central portion connected to the first oil passage 61 in the pump chamber 46 is a connection port 61a. As shown in FIG. 4, the discharge port 45 and the connection port 61a are, for example, circular. The discharge port 45 is disposed above the connection port 61a. The central axis J1 passes through the connection port 61a.

As shown in FIG. 1, the suction oil passage 63 extends upward from the opening 12f. The suction oil passage 63 is connected to the lower region in the vertical direction inside the housing portion 14 through the opening 12f. The upper end portion of the suction oil passage 63 is connected to the pump chamber 46 on the other axial side of the pump chamber 46. A portion where the suction oil passage 63 is connected in the pump chamber 46 is a suction port 44. That is, the suction oil passage 63 connects the lower region in the vertical direction inside the housing portion 14 and the suction port 44. As shown in FIG. 4, the suction port 44 has, for example, a circular shape. The suction port 44 is disposed below the discharge port 45 and the connection port 61a. The suction port 44 is disposed below the central axis J1.

As shown in FIG. 1, the suction oil passage 63 has a first portion 63a, a second portion 63b, and a third portion 63c. The first portion 63a extends upward from the opening 12f. The upper end portion of the first portion 63a is located above the inner peripheral surface of the lower end portion of the inner cylinder portion 12c. In the first portion 63a, for example, a groove that is recessed in the axial direction on one side from the surface on the other side in the axial direction of the cover plate portion 13c and extends in the vertical direction Z is closed by the surface on the one side in the axial direction of the annular plate portion 12a. Composed. Accordingly, the first portion 63a is disposed between the inner lid portion 12 and the outer lid portion 13 in the axial direction. An opening 12f opens in the first portion 63a. Thus, the opening 12f includes a vertical lower region inside the housing portion 14 and a portion of the suction oil passage 63 disposed between the inner lid portion 12 and the outer lid portion 13 in the axial direction. Connect.

The second portion 63b extends from the upper end of the first portion 63a to the other side in the axial direction. The second portion 63b is configured such that a groove that is recessed upward from the lower surface of the protruding portion 13d and extends to the other side in the axial direction is closed by the inner peripheral surface of the inner cylindrical portion 12c. Accordingly, the second portion 63b is disposed between the inner lid portion 12 and the outer lid portion 13 in the radial direction.

The third portion 63c extends upward from the other axial end of the second portion 63b. The third portion 63c is provided on the protruding portion 13d. The third portion 63c is disposed on the radially inner side of the inner cylinder portion 12c. The third portion 63 c is connected to the suction port 44. According to the present embodiment, at least a part of the suction oil passage 63 is disposed between the inner lid portion 12 and the outer lid portion 13 in the axial direction. Therefore, at least a part of the suction oil passage 63 can be configured by the inner lid portion 12 and the outer lid portion 13 fixed to each other, and the suction oil passage 63 can be easily manufactured.

The flow passage cross-sectional area of the suction oil passage 63 is smaller than the opening area of the opening 12f. In other words, the opening area of the opening 12 f is larger than the flow passage cross-sectional area of the suction oil passage 63. The flow passage cross-sectional area of the suction oil passage 63 is an area of the suction oil passage 63 in a cross section orthogonal to the flow direction of the oil O flowing through the suction oil passage 63. The flow passage cross-sectional area of the suction oil passage 63 includes a flow passage cross-sectional area of the first portion 63a, a flow passage cross-sectional area of the second portion 63b, and a flow passage cross-sectional area of the third portion 63c. The flow path cross-sectional area of the first portion 63a is an area of a cross section perpendicular to the vertical direction Z in the first portion 63a. The flow path cross-sectional area of the second portion 63b is an area of a cross section perpendicular to the axial direction of the second portion 63b. The flow path cross-sectional area of the third portion 63c is an area of a cross section perpendicular to the vertical direction Z in the third portion 63c. The opening area of the opening 12f is the area of the inner portion of the opening 12f when viewed along the axial direction.

The strainer 100 is attached to the housing 10. The strainer 100 is provided in the opening 12f. As shown in FIGS. 2 and 3, the strainer 100 includes a frame portion 110 and a strainer main body portion 120. The frame part 110 has a frame shape that opens on both sides in the axial direction. The frame part 110 has a fitting part 111 and a flange part 112. The fitting portion 111 has a frame shape along the inner peripheral edge of the opening 12f. The fitting portion 111 has a plate frame shape whose plate surface is parallel to the axial direction. As shown in FIG. 2, the fitting portion 111 is fitted into the opening 12f from the other side in the axial direction. The end portion on one side in the axial direction of the fitting portion 111 is at the same position in the axial direction as the end portion on one side in the axial direction of the opening 12f.

The flange portion 112 protrudes from the end portion on the other side in the axial direction of the fitting portion 111 to the outside of the fitting portion 111. As shown in FIG. 3, the flange portion 112 has a substantially rectangular frame shape. The flange portion 112 has a plate frame shape whose plate surface is orthogonal to the axial direction. The flange portion 112 has holes 112 a at four corners of the flange portion 112. The hole 112a penetrates the flange 112 in the axial direction.

As shown in FIG. 2, a fixing screw 130 is passed through the hole 112a from the other side in the axial direction. The fixing screw 130 is passed through the hole 112a and is tightened into the female screw hole 12h provided in the peripheral portion of the opening 12f in the annular plate portion 12a. Thereby, the frame part 110 is fixed to the peripheral part of the opening part 12f in the inner lid part 12. The surface on the one axial side of the flange portion 112 is in contact with the peripheral portion of the opening 12f in the bottom surface of the first recess 12i, that is, the surface on the other axial side of the annular plate portion 12a.

The strainer body 120 is a flat plate whose plate surface is orthogonal to the axial direction. As shown in FIG. 3, the shape of the strainer body 120 viewed along the axial direction is a rectangular shape. The strainer body 120 has numerous holes that penetrate the strainer body 120 in the axial direction. In the present embodiment, the strainer body 120 is, for example, a net shape. The innumerable holes of the strainer main body 120 are smaller than foreign matters such as wear powder contained in the oil O, for example. For example, the wear powder is generated by rubbing each part of the drive device 1 when the drive device 1 is assembled or when the drive device 1 is driven.

The strainer main body 120 is provided inside the frame 110. More specifically, in the strainer main body 120, the outer edge of the strainer main body 120 is fixed to the inner edge at the end on the other axial side of the fitting portion 111. The entire strainer body 120 overlaps the opening 12f when viewed along the axial direction. As viewed along the axial direction, the size of the strainer body 120 is substantially the same as the size of the opening 12f, and is slightly smaller than the size of the opening 12f. As shown in FIG. 2, the strainer body 120 covers the opening 12f from the other side in the axial direction. Thereby, the strainer 100 covers the opening 12f from the other side in the axial direction. In the present embodiment, the strainer 100 covers the entire opening 12f. The strainer body 120 is located on the other axial side of the opening 12f.

The rotor 20 includes a motor shaft 20a, a rotor core 22, a magnet 23, a first end plate 24, and a second end plate 25. The motor shaft 20 a includes a motor shaft main body 21 and an attachment member 50. The motor shaft body 21 has a cylindrical shape extending in the axial direction. The motor shaft main body 21 has a large diameter portion 21a, a first medium diameter portion 21b, a second medium diameter portion 21c, a small diameter portion 21d, and an output portion 21e.

The large diameter portion 21a is a portion to which the rotor core 22 is attached. A male screw portion is provided on the outer peripheral surface of the end portion on one axial side of the large diameter portion 21a. A nut 90 is fastened to the male screw portion of the large diameter portion 21a. The first medium diameter portion 21b is connected to the large diameter portion 21a on one axial side of the large diameter portion 21a. The outer diameter of the first medium diameter portion 21b is smaller than the outer diameter of the large diameter portion 21a. The end portion on the other axial side of the first medium diameter portion 21b is rotatably supported by the bearing 70.

The second medium diameter portion 21c is connected to the large diameter portion 21a on the other axial side of the large diameter portion 21a. The outer diameter of the second medium diameter portion 21c is smaller than the outer diameter of the large diameter portion 21a. The end portion on the one axial side of the second medium diameter portion 21c is rotatably supported by the bearing 71. The

bearings

70 and 71 rotatably support the motor shaft 20a. The

bearings

70 and 71 are ball bearings, for example.

The small diameter portion 21d is connected to the first medium diameter portion 21b on one axial side of the first medium diameter portion 21b. An end portion on one side in the axial direction of the small diameter portion 21 d is an end portion on one side in the axial direction of the motor shaft main body 21. The end portion on one side in the axial direction of the small diameter portion 21d is disposed on the radially inner side of the inner cylinder portion 12c. The outer diameter of the small diameter portion 21d is smaller than the outer diameter of the first medium diameter portion 21b. That is, the small diameter portion 21d is a portion whose outer diameter decreases toward one side in the axial direction.

The output part 21e is connected to the second medium diameter part 21c on the other axial side of the second medium diameter part 21c. The output portion 21e is an end portion on the other side in the axial direction of the motor shaft main body 21. The outer diameter of the output part 21e is smaller than the outer diameter of the small diameter part 21d. The output portion 21e protrudes outside the housing 10 through the bottom portion 11a in the axial direction.

The motor shaft main body 21 has a flange portion 21f. The flange portion 21f protrudes radially outward from the outer peripheral surface of the large diameter portion 21a. The flange portion 21f has an annular plate shape that is provided over the circumference of the outer peripheral surface of the large diameter portion 21a. The flange portion 21f is provided at the end portion on the other axial side of the large diameter portion 21a. The motor shaft main body 21 has a hole 21g extending from the end on one side in the axial direction of the motor shaft main body 21 to the other side in the axial direction. The hole 21g is a bottomed hole that opens to one side in the axial direction. That is, the end on the other axial side of the hole 21g is closed.

The mounting member 50 is fixed to one side of the motor shaft main body 21 in the axial direction. The attachment member 50 is fitted into the hole 21g and fixed. The attachment member 50 has a cylindrical shape that opens on both sides in the axial direction. In the present embodiment, the attachment member 50 has a cylindrical shape centered on the central axis J1. The attachment member 50 extends to one side in the axial direction from the motor shaft main body 21 and passes through the second through hole 13f.

The mounting member 50 includes a fitting part 51 and a fixing part 52. The fitting part 51 is a part fitted in the hole part 21g. The fitting portion 51 is fixed to the inner peripheral surface of the end portion on one side in the axial direction of the hole portion 21g, and extends from the inside of the hole portion 21g to one side in the axial direction than the motor shaft main body 21. One end of the fitting part 51 in the axial direction is inserted into the second through hole 13f. That is, at least a part of the fitting portion 51 is inserted into the second through hole 13f. Therefore, the radial gap between the outer peripheral surface of the mounting member 50 and the inner peripheral surface of the second through hole 13f can be increased. Thereby, even if it is a case where the position of the attachment member 50 shifts | deviates to radial direction by vibration etc., it can suppress that the attachment member 50 contacts the internal peripheral surface of the 2nd through-hole 13f.

The fixing part 52 is located on one side of the fitting part 51 in the axial direction. The fixing portion 52 is connected to the end portion on one side in the axial direction of the fitting portion 51. The outer diameter of the fixing portion 52 is larger than the outer diameter of the fitting portion 51 and smaller than the inner diameter of the second through hole 13f. The fixing portion 52 is inserted into the pump chamber 46. The inner diameter of the fitting part 51 and the inner diameter of the fixed part 52 are, for example, the same.

The external gear 42 which will be described later is fixed to the mounting member 50. In the present embodiment, the external gear 42 is fixed to the radially outer surface of the fixing portion 52. More specifically, the fixing portion 52 is fitted and fixed in a fixing hole portion 42b that penetrates the external gear 42 in the axial direction. Thus, according to the present embodiment, the fitting portion 51 having an outer diameter smaller than that of the fixing portion 52 is fitted into the hole portion 21g, and the external gear 42 is attached to the fixing portion 52 having an outer diameter larger than that of the fitting portion 51. Fix it. Therefore, the inner diameter of the hole portion 21g can be made smaller than the inner diameter of the fixed hole portion 42b of the external gear 42. Thereby, it is easy to make the internal diameter of the hole 21g comparatively small, and it can suppress that the rigidity of the motor shaft main body 21 falls.

The motor shaft 20a has a second oil passage 62 provided inside the motor shaft 20a. The second oil passage 62 is a bottomed hole that extends from the end on one side in the axial direction of the motor shaft 20a to the other side in the axial direction. The second oil passage 62 opens on one side in the axial direction. The second oil passage 62 extends from the end on the one axial side of the mounting member 50 to the end on the other axial side of the second medium diameter portion 21 c and extends across the mounting member 50 and the motor shaft main body 21. It is done. The second oil passage 62 is configured by connecting the inside of the attachment member 50 and the hole 21g in the axial direction. That is, the radially inner side surface of the mounting member 50 constitutes a part of the radially inner side surface of the second oil passage 62.

In the present embodiment, the inner edge of the second oil passage 62 has a circular shape centered on the central axis J1 in the cross section orthogonal to the axial direction. The inner diameter of the portion provided in the mounting member 50 in the second oil passage 62 is smaller than the inner diameter of the portion provided in the motor shaft main body 21 in the second oil passage 62. That is, the inner diameter of the mounting member 50 is smaller than the inner diameter of the hole 21g. The second oil passage 62 is connected to the first oil passage 61 through the inside of the attachment member 50 because the opening on the one axial side of the attachment member 50 is connected to the connection port 61a. That is, the second oil passage 62 opens into the first oil passage 61 at the end portion on the one axial side of the motor shaft 20a.

The motor shaft 20a has first through holes 26a to 26d that connect the second oil passage 62 and the outer peripheral surface of the motor shaft 20a. The first through holes 26a to 26d extend in the radial direction. The first through

holes

26a and 26b are provided in the large diameter portion 21a. The first through

holes

26a and 26b are disposed between the nut 90 and the flange portion 21f in the axial direction. As shown in FIG. 5, the radially outer end of the first through hole 26 a opens in the axial gap 27 a between the first end plate 24 and the rotor core 22. The radially outer end of the first through hole 26 b opens in the axial gap 27 b between the second end plate 25 and the rotor core 22.

The first through hole 26c is provided in the first medium diameter portion 21b. The radially outer end of the first through hole 26c opens on the radially inner side of the bearing holding portion 12e on one axial side of the bearing 70. The first through hole 26d is provided in the second medium diameter portion 21c. The radially outer end of the first through hole 26d opens on the radially inner side of the bearing holding portion 11c on the other axial side of the bearing 71. For example, a plurality of first through holes 26a to 26d are provided along the circumferential direction.

As shown in FIG. 1, the rotor core 22 has an annular shape fixed to the motor shaft main body 21. In the present embodiment, the rotor core 22 is fitted into the large diameter portion 21a. The rotor core 22 has a magnet insertion hole 22b that penetrates the rotor core 22 in the axial direction. A plurality of magnet insertion holes 22b are provided along the circumferential direction. The magnet 23 is inserted into the magnet insertion hole 22b.

The first end plate 24 and the second end plate 25 have an annular plate shape that expands in the radial direction. A large diameter portion 21 a is passed through the first end plate 24 and the second end plate 25. The first end plate 24 and the second end plate 25 sandwich the rotor core 22 in the axial direction while being in contact with the rotor core 22.

As shown in FIG. 5, the first end plate 24 is arranged on one side of the rotor core 22 in the axial direction. The radially outer edge portion of the first end plate 24 protrudes to the other side in the axial direction, and contacts the radially outer edge portion of the surface on the one axial side of the rotor core 22. The radially outer edge of the first end plate 24 overlaps with the opening on one axial side of the magnet insertion hole 22b in the axial direction, and presses the magnet 23 inserted into the magnet insertion hole 22b from one axial side. A portion radially inward from the radially outer edge portion of the first end plate 24 faces the surface on one side in the axial direction of the rotor core 22 in the axial direction through a gap 27a.

The first end plate 24 has an ejection groove 24a that is recessed from the surface on the one side in the axial direction of the first end plate 24 toward the other side in the axial direction. The ejection groove 24a extends in the radial direction. The radially inner end of the ejection groove 24a penetrates the first end plate 24 in the axial direction and is connected to the gap 27a. The radially outer end of the ejection groove 24a opens to the radially outer side of the first end plate 24, and opposes a coil 32, which will be described later, with a gap in the radial direction. The opening on the one axial side in the radially inner portion of the ejection groove 24 a is closed by a washer 91 that is sandwiched and fixed between the nut 90 and the first end plate 24 in the axial direction. The washer 91 has an annular plate shape that expands in the radial direction.

The second end plate 25 is disposed on the other axial side of the rotor core 22. The radially outer edge portion of the second end plate 25 projects to one side in the axial direction and contacts the radially outer edge portion of the surface on the other axial side of the rotor core 22. The radially outer edge of the second end plate 25 overlaps the opening on the other axial side of the magnet insertion hole 22b in the axial direction, and presses the magnet 23 inserted into the magnet insertion hole 22b from the other axial side. Thereby, the magnet 23 inserted into the magnet insertion hole 22b is pressed by the first end plate 24 and the second end plate 25 on both sides in the axial direction. Therefore, the magnet 23 can be prevented from coming out of the magnet insertion hole 22b.

The portion on the radially inner side of the radially outer edge portion of the second end plate 25 is opposed to the surface on the other axial side of the rotor core 22 in the axial direction with a gap 27b. The second end plate 25 has an ejection groove 25 a that is recessed from the surface on the other axial side of the second end plate 25 to the one axial side. The ejection groove 25a extends in the radial direction. The radially inner end of the ejection groove 25a penetrates the second end plate 25 in the axial direction and is connected to the gap 27b. The radially outer end of the ejection groove 25a opens to the radially outer side of the second end plate 25, and opposes the coil 32, which will be described later, with a gap in the radial direction. The opening on the other side in the axial direction in the radially inner portion of the ejection groove 25a is closed by the flange portion 21f.

The first end plate 24, the rotor core 22, and the second end plate 25 are sandwiched in the axial direction by the nut 90, the washer 91, and the flange portion 21f. When the nut 90 is tightened into the male screw portion of the large-diameter portion 21a, the nut 90 presses the first end plate 24, the rotor core 22, and the second end plate 25 against the flange portion 21f via the washer 91. Thereby, the 1st end plate 24, the rotor core 22, and the 2nd end plate 25 are fixed to the motor shaft 20a.

The rotation detector 80 shown in FIG. 1 detects the rotation of the rotor 20. In the present embodiment, the rotation detection unit 80 is, for example, a VR (Variable Reluctance) type resolver. The rotation detector 80 is disposed on the radially inner side of the inner cylinder portion 12c. The rotation detection unit 80 includes a detected unit 81 and a sensor unit 82.

The detected part 81 is a ring extending in the circumferential direction. The detected part 81 is fitted and fixed to the motor shaft 20a. More specifically, the detected portion 81 is fitted and fixed to the small diameter portion 21d. The surface on the other axial side of the radially inner edge of the detected portion 81 is in contact with the step between the first medium diameter portion 21b and the small diameter portion 21d. The detected portion 81 overlaps the mounting member 50 in the radial direction. Therefore, the motor shaft 20a can be easily downsized in the axial direction as compared with the case where the detected portion 81 and the attachment member 50 are arranged in the axial direction without overlapping in the radial direction. The detected part 81 is made of a magnetic material.

In addition, in this specification, “some objects overlap in a certain direction” includes that some objects overlap when viewed along a certain direction. That is, that the detected portion 81 and the attachment member 50 overlap in the radial direction includes the overlap of the detected portion 81 and the attachment member 50 when viewed along the radial direction.

The sensor part 82 is disposed between the inner lid part 12 and the outer lid part 13 in the axial direction. More specifically, the sensor part 82 is fixed to the surface on the one axial side of the inner cylinder bottom part 12d on the radially inner side of the inner cylinder part 12c. That is, the sensor unit 82 is attached to the inner lid unit 12. Therefore, it is easy to attach the sensor unit 82. The sensor part 82 is arrange | positioned in the 2nd recessed part 12g. Therefore, after attaching the inner lid part 12 to the main body part 11, the sensor part 82 can be inserted and arranged in the second recessed part 12g from the opening on one side in the axial direction of the second recessed part 12g. Therefore, it is easy to arrange the sensor unit 82.

The sensor part 82 is an annular shape that surrounds the radially outer side of the detected part 81. The sensor unit 82 has a plurality of coils along the circumferential direction. When the detected portion 81 rotates together with the motor shaft 20a, an induced voltage corresponding to the circumferential position of the detected portion 81 is generated in the coil of the sensor portion 82. The sensor unit 82 detects the rotation of the detected unit 81 by detecting the induced voltage. Thereby, the rotation detector 80 detects the rotation of the rotor 20 by detecting the rotation of the motor shaft 20a.

The stator 30 faces the rotor 20 via a gap in the radial direction. The stator 30 includes a stator core 31 and a plurality of coils 32 attached to the stator core 31. The stator core 31 has an annular shape centered on the central axis J1. The outer peripheral surface of the stator core 31 is fixed to the inner peripheral surface of the main body cylinder portion 11b. The stator core 31 is opposed to the outer side in the radial direction of the rotor core 22 via a gap.

The pump part 40 is provided in the center part of the outer lid part 13. The pump part 40 is arrange | positioned at the axial direction one side of the motor shaft 20a. The pump unit 40 includes an external gear 42, an internal gear 43, the above-described pump chamber 46, a suction port 44, a discharge port 45, and a storage unit 48. The external gear 42 is a gear that can rotate around the central axis J1. The external gear 42 is fixed to an end portion on one axial side of the motor shaft 20a. More specifically, the external gear 42 is fixed to the outer peripheral surface of the fixing portion 52. Therefore, the external gear 42 can be fixed to the motor shaft main body 21 via the mounting member 50. Thereby, the external gear 42 can be fixed to the motor shaft main body 21 without changing the dimensions of the motor shaft main body 21 and the external gear 42 by adjusting the dimensions of the mounting member 50.

The external gear 42 is accommodated in the pump chamber 46. As shown in FIG. 4, the external gear 42 has a plurality of tooth portions 42a on the outer peripheral surface. The tooth profile of the tooth portion 42a of the external gear 42 is a trochoidal tooth profile.

The internal gear 43 is an annular gear that is rotatable around a rotation axis J2 that is eccentric with respect to the central axis J1. The internal gear 43 is accommodated in the pump chamber 46. The internal gear 43 surrounds the radially outer side of the external gear 42 and meshes with the external gear 42. The internal gear 43 has a plurality of tooth portions 43a on the inner peripheral surface. The tooth profile of the tooth portion 43a of the internal gear 43 is a trochoidal tooth profile. Thus, since the tooth profile of the tooth portion 42a of the external gear 42 and the tooth profile of the tooth portion 43a of the internal gear 43 are trochoidal tooth profiles, a trochoid pump can be configured. Therefore, noise generated from the pump unit 40 can be reduced, and the pressure and amount of the oil O discharged from the pump unit 40 can be easily stabilized.

In the present embodiment, after the internal gear 43 and the external gear 42 are inserted from the opening on one side in the axial direction of the third recess 13e, the opening on the one side in the axial direction of the third recess 13e is closed by the plug portion 13b. Thus, the pump chamber 46 can be configured, and the internal gear 43 and the external gear 42 can be accommodated in the pump chamber 46. Therefore, the assembly of the pump unit 40 can be facilitated.

As described above, the suction port 44 is connected to the suction oil passage 63. As shown in FIG. 1, the suction port 44 opens to the other axial side of the pump chamber 46. The suction port 44 is connected to a gap between the external gear 42 and the internal gear 43. The suction port 44 allows the oil O stored in the storage unit 14 to pass through the strainer 100, the opening 12f, and the suction oil passage 63 into the pump chamber 46, more specifically, the external gear 42 and the internal gear 43. Can be inhaled into the gap. As shown in FIG. 4, the suction port 44 is disposed above the lower end portion of the storage portion 48 and above the lower end portion of the external gear 42.

As described above, the discharge port 45 is connected to the first oil passage 61. As shown in FIG. 1, the discharge port 45 opens on one axial side of the pump chamber 46. The discharge port 45 is connected to a gap between the external gear 42 and the internal gear 43. The discharge port 45 can discharge the oil O from the inside of the pump chamber 46, more specifically, from the gap between the external gear 42 and the internal gear 43.

The reservoir 48 is connected to the pump chamber 46 on one axial side of the vertical lower region of the pump chamber 46. As shown in FIG. 4, the shape of the storage portion 48 is an arc shape that protrudes downward when viewed in the axial direction. Part of the oil O sucked into the pump chamber 46 from the suction port 44 flows into the storage portion 48.

Since the suction port 44 is disposed above the lower end of the storage unit 48, even when the pump unit 40 is stopped, at least a part of the oil O that has flowed into the storage unit 48 flows from the suction port 44. It is stored in the storage unit 48 without returning to the storage unit 14. Thereby, when the pump part 40 is stopped, the lower part of the external gear 42 in the pump chamber 46 and the lower part of the internal gear 43 are in contact with the oil O in the storage part 48. Can be. Therefore, when the pump portion 40 is driven again, the space between the tooth portion 42 a of the external gear 42 and the tooth portion 43 a of the internal gear 43, the inner peripheral surface of the pump chamber 46, and the outer peripheral surface of the internal gear 43 Oil O can be interposed between the two, and seizure can be suppressed.

When the rotor 20 rotates and the motor shaft 20a rotates, the external gear 42 fixed to the motor shaft 20a rotates. As a result, the internal gear 43 that meshes with the external gear 42 rotates, and the oil O sucked into the pump chamber 46 from the suction port 44 passes between the external gear 42 and the internal gear 43. It is sent to the discharge port 45. In this way, the pump unit 40 is driven via the motor shaft 20a. The oil O discharged from the discharge port 45 flows into the first oil passage 61 and flows into the second oil passage 62 from the connection port 61a. As indicated by an arrow in FIG. 5, the oil O that has flowed into the second oil passage 62 receives a force radially outward due to the centrifugal force of the rotating motor shaft 20a, and passes through the first through holes 26a to 26d. It flows out of the shaft 20a.

In the present embodiment, since the first through hole 26a opens in the axial gap 27a between the first end plate 24 and the rotor core 22, the oil O flowing out of the first through hole 26a flows into the gap 27a. And the oil O which flowed into the clearance gap 27a is ejected toward the radial direction outer side from the ejection groove 24a. In the present embodiment, the opening on the one axial side in the radially inner portion of the ejection groove 24 a is closed by the washer 91, so that the oil O that has flowed into the ejection groove 24 a is guided radially outward by the washer 91. It's easy to do.

Since the first through hole 26b opens in the axial gap 27b between the second end plate 25 and the rotor core 22, the oil O flowing out of the first through hole 26b flows into the gap 27b. And the oil O which flowed into the clearance gap 27b is ejected toward the radial direction outer side from the ejection groove 25a. In the present embodiment, the opening on the other axial side in the radially inner portion of the ejection groove 25a is closed by the flange portion 21f, so the oil O that has flowed into the ejection groove 25a is directed radially outward by the flange portion 21f. Easy to guide.

The oil O ejected radially outward from the

ejection grooves

24 a and 25 a is sprayed to the coil 32. Thereby, the coil 32 can be cooled by the oil O. In the present embodiment, since the second oil passage 62 is provided inside the motor shaft 20a, the rotor 20 can be cooled by the oil O until it is ejected from the

ejection grooves

24a and 25a. Thus, the oil O discharged from the discharge port 45 in the present embodiment is guided to the rotor 20 and the stator 30.

Since the first through hole 26c opens to the inside of the bearing holding portion 12e in the radial direction, the oil O flowing out from the first through hole 26c is supplied to the bearing 70. Since the first through hole 26d opens to the inside of the bearing holding portion 11c in the radial direction, the oil O flowing out of the first through hole 26d is supplied to the bearing 71. Thereby, the oil O can be used as a lubricant for the

bearings

70 and 71.

Although FIG. 5 shows an example in which the oil O is ejected upward from the

ejection grooves

24a and 25a, the present invention is not limited to this. Since the rotor 20 rotates, the circumferential positions of the

ejection grooves

24 a and 25 a change as the rotor 20 rotates. Thereby, the direction of the oil O ejected from the

ejection grooves

24a and 25a changes in the circumferential direction, and the plurality of coils 32 arranged along the circumferential direction can be cooled by the oil O.

As described above, the pump unit 40 can be driven by the rotation of the motor shaft 20a, and the oil O stored in the housing 10 is sucked up by the pump unit 40 and supplied to the rotor 20, the stator 30, and the

bearings

70 and 71. be able to. Thus, the oil O stored in the housing 10 can be used to cool the rotor 20 and the stator 30, and the lubricity between the

bearings

70 and 71 and the motor shaft body 21 can be improved. The oil O supplied to the stator 30 and the

bearings

70 and 71 falls in the housing portion 14 and is stored again in the lower region inside the housing portion 14. Thereby, the oil O in the accommodating part 14 can be circulated.

According to this embodiment, since the strainer 100 is provided in the opening 12f, the oil O flowing into the suction oil passage 63 from the opening 12f passes through the strainer 100. Specifically, the oil O flowing into the suction oil passage 63 passes through innumerable holes in the strainer main body 120. On the other hand, foreign matter such as wear powder contained in the oil O is difficult to pass through innumerable holes and is easily blocked by the strainer body 120. Thereby, even if foreign matter such as wear powder is included in the oil O, the foreign matter can be blocked by the strainer 100, and the foreign matter can enter the suction oil passage 63 connected to the suction port 44 of the pump unit 40. Can be suppressed. Therefore, according to the present embodiment, it is possible to obtain the drive device 1 that can suppress entry of foreign matter into the pump unit 40. As a result, for example, foreign matter can be prevented from biting between the external gear 42 and the internal gear 43, and the external gear 42 can be prevented from rotating relative to the internal gear 43. Therefore, it can suppress that the pump part 40 is locked.

In this embodiment, since the innumerable holes of the strainer main body 120 are smaller than the foreign substances, the foreign objects cannot pass through the innumerable holes of the strainer main body 120. Thereby, it can suppress more that a foreign material penetrate | invades into the pump part 40. FIG.

In addition, for example, when the inner lid portion and the outer lid portion are part of a lid member that is a single member, a method of creating the suction oil passage is to drill the lid member along the suction oil passage. A method of making a hole is conceivable. However, when this method is used, if the suction oil passage is bent, it is difficult to form the suction oil passage by a single hole drilling. Therefore, hole processing is performed for each linear flow path portion extending linearly in the suction oil path, and the suction flow path is formed by performing the hole processing a plurality of times. Here, when creating the straight flow path portion, unnecessary holes that do not constitute the straight flow path portion are likely to occur due to the necessity of drilling holes that penetrate the lid member in the direction in which the straight flow path portion extends. Part is easy to make. Therefore, it is necessary to block unnecessary hole portions with a stopper or the like.

In the case where the suction oil passage is formed in the lid member that is a single member as described above, for example, when the opening area of the opening portion that opens to the inside of the housing portion is considered, the lid member is penetrated. After making a large through hole by drilling, it is necessary to close the portion of the through hole opposite to the opening with a plug or the like. However, in this case, since the through hole is large, it is difficult to close the through hole with high accuracy. Therefore, in the lid member that is a single member, it may be difficult to increase the opening area of the opening of the suction oil passage.

When the opening area of the opening is relatively small, the area of the strainer main body through which the oil O passes is also small. For this reason, there is a problem that clogging is likely to occur due to the foreign matter if the foreign matter is blocked to some extent by the strainer body. When the strainer is clogged, it becomes difficult for the oil O to pass through the strainer, so that the oil O is hardly supplied to the pump unit.

On the other hand, according to the present embodiment, the inner lid portion 12 and the outer lid portion 13 are separate members, and the opening portion 12f includes the inside of the accommodating portion 14, the inner lid portion 12 and the outer lid portion 13. And the portion of the suction oil passage 63 disposed between the two. Therefore, the entire through hole made by drilling the inner lid portion 12 can be used as the opening portion 12f. That is, even if the hole processing that penetrates the inner lid portion 12 is performed, an unnecessary hole portion does not occur. Therefore, it is not necessary to block a part of the through hole made by drilling, and it is easy to increase the opening area of the opening 12f. Therefore, the opening 12f can be enlarged, and the portion of the strainer 100 provided in the opening 12f that blocks foreign matter, that is, the strainer body 120 can be enlarged. Thereby, it can suppress that the strainer 100 causes clogging by a foreign material. Therefore, according to the present embodiment, it is possible to easily supply the oil O to the pump unit 40 while suppressing foreign matter from entering the pump unit 40.

In the present embodiment, the opening area of the opening 12f is larger than the cross-sectional area of the suction oil passage 63. Therefore, the opening 12f can be made relatively large, and the strainer 100 provided in the opening 12f can be made relatively large. Therefore, clogging of the strainer 100 can be further suppressed.

Further, according to the present embodiment, the strainer 100 covers the entire opening 12f. Therefore, all of the oil O flowing into the intake oil passage 63 from the opening 12f passes through the strainer 100. Thereby, the strainer 100 can block the foreign matter more, and can further suppress the foreign matter from entering the pump unit 40.

Further, according to the present embodiment, the strainer 100 covers the opening 12f from the other side in the axial direction. That is, the strainer 100 covers the opening 12 f from the side opposite to the side on which the outer lid portion 13 is disposed with respect to the inner lid portion 12. Therefore, for example, even when the strainer 100 is large in the axial direction, the strainer 100 can be disposed inside the accommodating portion 14. Thus, since the inside of the accommodating portion 14 can be used as a space for placing the strainer 100, it is difficult to change the shape of the housing 10 even when the shape of the strainer 100 is changed, and the drive device. It can suppress that 1 enlarges.

Further, since the strainer 100 can be prevented from being disposed in the suction oil passage 63, the strainer 100 can be prevented from interfering with the flow of the oil O in the suction oil passage 63. Specifically, in the present embodiment, since the flange portion 112 is not disposed in the suction oil passage 63, the oil O does not collide with the flange portion 112 in the suction oil passage 63, and the oil O in the suction oil passage 63 does not collide. It is possible to suppress the disturbance of the flow. Therefore, the energy efficiency of the pump unit 40 can be improved.

Further, since the strainer 100 can be disposed in the storage portion 14 in which the oil O is stored, foreign matter in the oil O is blocked by the strainer 100 at a position closer to the storage portion 14, that is, at a position further away from the suction oil passage 63. be able to. Therefore, it is easier to prevent foreign matter from entering the pump unit 40.

Further, according to the present embodiment, the opening 12f is provided on the bottom surface of the first recess 12i. Therefore, for example, even if the foreign matter blocked by the strainer 100 is peeled off from the strainer 100, the foreign matter is easily retained in the first recess 12i. Thereby, the foreign material in the oil O can be easily collected in the first recess 12i. Therefore, the movement of the foreign matter inside the housing portion 14 can be suppressed, and for example, the foreign matter can be prevented from moving to the

bearings

70 and 71. Thereby, it can suppress that a foreign material penetrate | invades between the inner ring | wheel and the outer ring | wheel of the

bearings

70 and 71, and it can suppress that the inner ring | wheel of the

bearings

70 and 71 cannot rotate relatively with respect to an outer ring | wheel.

Further, when the strainer 100 is arranged inside the accommodating portion 14 as described above, the inside of the first recess 12i can be used as a space for arranging the strainer 100, and the strainer 100 is arranged. Cheap.

Further, according to the present embodiment, the strainer main body 120 has a flat plate shape. Therefore, the space where the strainer 100 is disposed can be reduced, and the strainer 100 is easily disposed. Moreover, it is easy to attach the strainer 100 to the opening 12f.

Moreover, according to this embodiment, the oil O discharged from the discharge port 45 can be sent to the inside of the motor shaft 20a by providing the first oil passage 61 and the second oil passage 62. Further, since the first through holes 26 a to 26 d are provided, the oil O that has flowed into the second oil passage 62 can be supplied to the stator 30 and the

bearings

70 and 71.

Further, according to the present embodiment, the second oil passage 62 provided in the motor shaft 20a opens to the first oil passage 61 connected to the discharge port 45 at the end portion on one axial side of the motor shaft 20a. . Since the external gear 42 is fixed to the end portion on the one axial side of the motor shaft 20a, the end portion on the one axial side of the motor shaft 20a is disposed at a position relatively close to the discharge port 45. Therefore, the length of the first oil passage 61 connecting the discharge port 45 and the second oil passage 62 can be shortened. Therefore, according to the present embodiment, the total length of the oil passage from the opening 12f to the second oil passage 62 can be easily shortened. Thereby, it is easy to send the oil O to the second oil passage 62 provided inside the motor shaft 20a. Further, the structure of the driving device 1 can be easily simplified, and the manufacturing of the driving device 1 can be facilitated.

Further, according to the present embodiment, the radially inner side surface of the mounting member 50 constitutes a part of the radially inner side surface of the second oil passage 62. Therefore, the oil O can be allowed to flow into the second oil passage 62 from the mounting member 50 while fixing the external gear 42 to the mounting member 50. Thus, as described above, the motor shaft main body 21 and the external gear 42 can be fixed via the mounting member 50 without changing the dimensions of the motor shaft main body 21 and the external gear 42, and the second oil It is easy to open the path 62 to the first oil path 61.

The present invention is not limited to the above-described embodiment, and other configurations can be adopted. The strainer 100 is not particularly limited as long as it is provided in the opening 12f. The shape of the strainer 100 may be, for example, a cylindrical shape. Moreover, the strainer 100 may cover the opening 12f from one side in the axial direction. Further, the strainer 100 may cover only a part of the opening 12f. Moreover, the strainer main-body part 120 does not need to be mesh shape, as long as it has innumerable holes. Further, the opening 12 f may penetrate the inner lid 12 in any direction as long as it penetrates the inner lid 12. For example, the opening 12f may penetrate the inner lid 12 in the vertical direction Z or may penetrate the inner lid 12 in the radial direction. The pump chamber 46 may be provided in the inner lid portion 12.

The external gear 42 may be directly fixed to the motor shaft main body 21 without using the attachment member 50. In this case, the second oil passage 62 may be provided only inside the motor shaft main body 21, for example. Further, the attachment member 50 may be fixed to the outer peripheral surface of the motor shaft main body 21.

Further, the mounting member 50 may be a member having a uniform outer diameter over the entire axial direction. That is, the outer diameter of the fitting part 51 and the outer diameter of the fixing part 52 may be the same. In this case, for example, if the outer diameter of the fixed portion 52 is made the same as the outer diameter of the fitting portion 51 shown in FIG. 1, the outer diameter of the external gear 42 to which the fixed portion 52 is fixed can be reduced. is there. Thereby, the outer diameter of the internal gear 43 can be reduced, and the inner diameter of the pump chamber 46 can be reduced. Therefore, the outer diameter of the protrusion 13d provided with the pump chamber 46 can be reduced, and the distance between the radial outer surface of the protrusion 13d and the inner peripheral surface of the second recess 12g can be increased. Therefore, for example, it is possible to arrange a portion of the sensor portion 82 that protrudes on one side in the axial direction between the radial outer surface of the protruding portion 13d and the inner peripheral surface of the second recess 12g. Thus, the sensor unit 82 can be brought closer to the outer lid unit 13. Thereby, it is easy to miniaturize the entire driving device 1 in the axial direction. In addition, the part which protrudes in the axial direction one side among the sensor parts 82 is a coil which the sensor part 82 has, for example.

The mounting member 50 may be composed of two or more members. In this case, the attachment member 50 includes a first tubular member fitted into the hole portion 21g, and a second tubular member fitted to the first tubular member and extending to one side in the axial direction from the motor shaft main body 21. You may have. In this case, the external gear 42 is fixed to the end portion on the one axial side of the second cylindrical member.

In the above-described embodiment, the portion of the attachment member 50 that is passed through the second through hole 13f is the fitting portion 51 having an outer diameter smaller than that of the fixed portion 52. For this reason, the inner diameter of the second through hole 13f is made smaller than the outer diameter of the fixed portion 52, and the radial gap between the outer peripheral surface of the mounting member 50 and the inner peripheral surface of the second through hole 13f is made relatively small. Can also be adopted. Thereby, it can suppress that the oil O in the pump chamber 46 leaks through the 2nd through-hole 13f. When this configuration is adopted, the assembler inserts the fitting portion 51 into the second through hole 13f from the left opening of the third recess 13e after attaching the outer lid portion 13 to the inner lid portion 12, The mounting member 50 is fixed to the motor shaft main body 21 by being fitted into the hole 21 g of the motor shaft main body 21.

Further, if the second through hole 13f can be made small, the radially inner end portion of the closing portion that closes the opening on the other axial side of the pump chamber 46 can be arranged on the radially inner side. In the present embodiment, the closing portion that closes the opening on the other axial side of the pump chamber 46 is a portion on the radially outer side of the second through hole 13f in the protruding portion 13d. Since the radially inner end of the closed portion can be arranged more radially inward, the other axial direction of the pump chamber 46 can be reduced by the closed portion even if the outer diameter of the external gear 42 and the outer diameter of the internal gear 43 are made smaller. The side opening can be suitably closed. Therefore, the inner diameter of the pump chamber 46 can be reduced. Accordingly, in the same manner as described above, it is possible to dispose a part of the sensor unit 82 between the radial direction outer surface of the protruding portion 13d and the inner circumferential surface of the second recess 12g. It is easy to downsize the device 1 in the axial direction.

The rotor core 22 may be fixed to the outer peripheral surface of the motor shaft main body 21 by press fitting or the like. In this case, the first end plate 24 and the second end plate 25 may not be provided. In this case, the oil O flowing out of the first through

holes

26a and 26b may be directly supplied to the coil 32, or a hole connected to the first through hole 26a is provided in the rotor core 22, and the hole of the rotor core 22 is provided. Oil O may be supplied to the coil 32 via Further, the oil O may be supplied to the stator core 31.

Moreover, the location to which the oil O discharged from the discharge port 45 is supplied is not particularly limited, and may be supplied to only one or two of the rotor 20, the stator 30, and the

bearings

70 and 71, for example. However, it may not be supplied to either. The oil O discharged from the discharge port 45 may be supplied to, for example, the inner side surface of the upper area in the vertical direction of the storage unit 14. In this case, the stator 30 can be indirectly cooled by cooling the housing 10. Further, any one or more of the first through holes 26a to 26d may not be provided. The tooth profile of the tooth portion 42a of the external gear 42 and the tooth profile of the tooth portion 43a of the internal gear 43 may be a cycloid tooth profile or an involute tooth profile.

In addition, the use of the drive device of the above-described embodiment is not particularly limited. Moreover, each structure mentioned above can be suitably combined in the range which is not mutually contradictory.

DESCRIPTION OF SYMBOLS 1 ... Drive device, 10 ... Housing, 12 ... Inner cover part, 12f ... Opening part, 12i ... 1st recessed part, 13 ... Outer cover part, 14 ... Storage part, 20 ... Rotor, 20a ... Motor shaft, 22 ... Rotor core, DESCRIPTION OF SYMBOLS 30 ... Stator, 40 ... Pump part, 44 ... Suction port, 45 ... Discharge port, 46 ... Pump chamber, 63 ... Suction oil passage, 70, 71 ... Bearing, 100 ... Strainer, 110 ... Frame part, 120 ... Strainer main-body part , J1 ... central axis, O ... oil, Z ... vertical direction

Claims

A rotor having a motor shaft disposed along a central axis extending in one direction and a rotor core fixed to the motor shaft;
A stator facing the rotor via a gap in the radial direction;
A housing having an accommodating portion capable of accommodating the rotor and the stator and storing oil;
A pump unit driven via the motor shaft;
A strainer attached to the housing;
With
The pump part is
A pump chamber provided in the housing;
A suction port capable of sucking oil into the pump chamber;
A discharge port capable of discharging oil from the pump chamber;
Have
The housing is
An inner lid that holds a bearing that rotatably supports the motor shaft and covers one side in the axial direction of the stator;
An outer lid attached to one side of the inner lid in the axial direction and covering one side of the motor shaft in the axial direction;
A suction oil passage connecting the lower area in the vertical direction and the suction port inside the housing portion;
Have
The inner lid portion and the outer lid portion are separate members from each other.
At least a part of the suction oil passage is disposed between the inner lid portion and the outer lid portion,
The inner lid has an opening that penetrates the inner lid,
The opening portion connects a lower region in the vertical direction inside the housing portion and a portion of the suction oil passage disposed between the inner lid portion and the outer lid portion,
The said strainer is a drive device provided in the said opening part.
The driving device according to claim 1, wherein an opening area of the opening is larger than a cross-sectional area of the suction oil passage.
The drive device according to claim 1 or 2, wherein the strainer covers the entire opening.
The opening penetrates the inner lid in the axial direction, and is a vertical lower region in the interior of the accommodating portion, and the axial direction of the inner lid and the outer lid in the suction oil passage. Connecting the part arranged between
The drive device according to any one of claims 1 to 3, wherein the strainer covers the opening from the other side in the axial direction.
The inner lid portion has a first recess that is recessed from the other side in the axial direction to one side in the axial direction,
5. The drive device according to claim 1, wherein the opening is provided on a bottom surface of the first recess.
The strainer
A frame-like frame portion fixed to a peripheral edge portion of the opening in the inner lid portion;
A flat plate-like strainer main body provided inside the frame and covering the opening;
The drive device according to claim 1, comprising: