WO2020031999A1

WO2020031999A1 - Motor

Info

Publication number: WO2020031999A1
Application number: PCT/JP2019/030835
Authority: WO
Inventors: 中村　圭吾; 山口　康夫; 久嗣藤原
Original assignee: 日本電産株式会社
Priority date: 2018-08-07
Filing date: 2019-08-06
Publication date: 2020-02-13
Also published as: CN112534690A; JP7452423B2; JPWO2020031999A1

Abstract

A motor according to an embodiment of the present invention is provided with: a rotor having a motor shaft disposed along a center axis extending in one direction; a stator facing the rotor in the radial direction, with a gap therebetween; and a housing having an accommodation part that can accommodate the rotor and the stator while storing oil. The housing has a cylindrical section that supports the stator from the outside in the radial direction. The cylindrical section has a cooling flow passage through which a coolant flows. The housing has a fin part protruding inside the accommodation part.

Description

motor

The present invention relates to a motor. This application claims priority based on Japanese Patent Application No. 2018-148692 filed on Aug. 07, 2018 and Japanese Patent Application No. 2018-148693 filed on Aug. 07, 2018, The contents are incorporated herein.

There is known a rotary electric machine including a case for storing a lubricating fluid for lubrication and cooling of a stator and a rotor. For example, Patent Literature 1 describes a rotating electric machine mounted on a vehicle.

JP 2013-055728 A

潤滑 The lubricating fluid as described above is led out of the case and cooled, for example. However, in this case, it is necessary to provide a flow path for leading the lubricating fluid from the case to the outside, and there is a problem that the structure of the rotating electric machine is complicated. In addition, in order to ensure the airtightness of the case, it is necessary to accurately seal the connection between the case and the flow path for leading the lubricating fluid to the outside, which may increase the man-hour and cost of manufacturing the rotating electric machine. there were.

In view of the above circumstances, it is an object of the present invention to provide a motor that can appropriately cool a stator and oil stored in a housing with a simple structure.

One aspect of a motor according to the present invention includes a rotor having a motor shaft arranged along a central axis extending in one direction, a stator facing the rotor with a gap in a radial direction, and a rotor and a stator are housed. And a housing having an accommodating portion capable of storing oil. The housing has a cylindrical portion that supports the stator from the radial outside. The cylinder has a cooling channel through which the refrigerant flows. The housing has a fin that projects into the housing.

According to one aspect of the present invention, in a motor, oil stored in a stator and a housing can be suitably cooled with a simple structure.

FIG. 1 is a perspective view showing the motor of the present embodiment. FIG. 2 is a diagram showing the motor of the present embodiment, and is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a view of the pump section of the present embodiment viewed from the other side in the axial direction. FIG. 4 is a view of the water jacket of the present embodiment viewed from one side in the axial direction. FIG. 5 is a perspective view showing a part of the water jacket of the present embodiment. FIG. 6 is a diagram showing a part of the motor of the present embodiment, and is a partially enlarged view of FIG. FIG. 7 is a perspective view illustrating a cooling channel according to the present embodiment. FIG. 8 is a schematic configuration diagram schematically showing a driving device on which the motor of the present embodiment is mounted.

Ｚ 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 a vertical direction in each drawing. In the following description, the upper side in the vertical direction is simply called “upper side”, and the lower side in the vertical direction is simply called “lower side”.

As shown in FIGS. 1 and 2, the motor 1 of the present embodiment includes a housing 10, a rotor 20 having a motor shaft 20 a disposed along a central axis J1 extending in one direction, a rotation detection unit 80, It includes a stator 30, a pump section 40, and

bearings

70 and 71.

中心 As shown in FIG. 2, the center axis J1 extends in the left-right direction of FIG. That is, in the present embodiment, the left-right direction in FIG. 2 corresponds to one direction. The Y-axis direction shown in each drawing is a direction parallel to the central axis J1. In the following description, a direction parallel to the axial direction of the central axis J1 is simply referred to as “axial direction Y”, a radial direction about the central axis J1 is simply referred to as “radial direction”, and the central axis J1 is defined as a center. The circumferential direction is simply referred to as “circumferential direction R”. The axial direction Y is a direction orthogonal to the vertical direction Z. In addition, the left side of FIG. 2 in the axial direction Y, that is, the positive side in the Y-axis direction is called “one side in the axial direction”, and the right side of the axial direction Y in FIG. , "The other side in the axial direction". The X-axis direction shown in each drawing is a direction orthogonal to both the axial direction Y and the vertical direction Z. In the following description, a direction parallel to the X-axis direction is referred to as “width direction X”.

The housing 10 includes a main body 11, a lid 13, a water jacket 60, and a plate member 12. In the present embodiment, the main body 11, the lid 13, the water jacket 60, and the plate member 12 are separate members. The main body 11 has a bottomed cylindrical shape that opens on one side in the axial direction. The main body 11 has a bottom part 11a, a second cylindrical part 11b, a bearing holding part 11c, and a wiring housing part 11e. The bottom portion 11a is in the shape of an annular plate that expands in the radial direction.

The second cylindrical portion 11b has a cylindrical shape extending from the radially outer edge of the bottom portion 11a to one side in the axial direction. In the present embodiment, the second cylindrical portion 11b has a cylindrical shape centered on the central axis J1. The second cylindrical portion 11b has a flow path component 11d. The channel forming portion 11d is a portion of the radially inner side surface of the second cylindrical portion 11b facing the inside of a cooling channel 90 described later. The bearing holding portion 11c has a cylindrical shape protruding from the radial inner edge of the bottom portion 11a to one side in the axial direction. The bearing holding part 11c holds the bearing 71 on the inner peripheral surface.

The wiring housing 11e is provided on the upper part of the second cylindrical part 11b. The wiring housing portion 11e protrudes upward from a radially outer surface of the second cylindrical portion 11b. In this embodiment, the wiring accommodating portion 11e has a box shape that opens on one side in the axial direction. The wiring housing 11e has a trapezoidal shape when viewed in the axial direction. In the present embodiment, the opening on one side in the axial direction of the main body 11 is constituted by an opening on one side in the axial direction of the second cylindrical portion 11b and an opening on one side in the axial direction of the wiring housing portion 11e. The wiring housing 11e has a connector wall 11f and a top wall 11g.

The connector wall portion 11f is a wall portion located on the other side in the axial direction among the wall portions constituting the box-shaped wiring housing portion 11e. A plurality of connectors 100 are provided on the connector wall 11f. As shown in FIG. 1, the plurality of connectors 100 protrude from the connector wall 11f to the other axial side. The plurality of connectors 100 are arranged side by side along the width direction X. For example, three connectors 100 are provided. The top wall portion 11g is a wall portion located on the upper side among the wall portions constituting the box-shaped wiring accommodating portion 11e. As shown in FIG. 2, the through-hole 11h which penetrates the top wall 11g in the vertical direction Z is provided in the top wall 11g. The through hole 11h is closed by fixing the plate member 12 to the top wall portion 11g with a screw or the like.

蓋 As shown in FIG. 2, the lid 13 is attached to one axial side of the main body 11. The lid 13 closes an opening on one axial side of the main body 11. When the main body 11 and the lid 13 are fixed to each other, a housing 17 surrounded by the main body 11 and the lid 13 is configured. That is, the housing 10 has the housing 17. The housing 17 houses the rotor 20 and the stator 30 and can store the oil O. The oil O is stored in a vertically lower region inside the housing portion 17. In this specification, the “vertical lower side region inside the housing portion” includes a portion located inside the housing portion 17 below the center in the vertical direction Z.

(4) The liquid level OS of the oil O stored in the storage portion 17 fluctuates when the oil O is sucked up by the pump portion 40, but is arranged at least below the rotor 20 when the rotor 20 rotates. Thereby, when the rotor 20 rotates, it is possible to suppress the oil O from becoming a rotational resistance of the rotor 20.

As the oil O, it is preferable to use an oil equivalent to an automatic transmission fluid (ATF: Automatic Transmission Fluid) having a relatively low viscosity in order to exhibit functions of a lubricating oil and a cooling oil.

The lid portion 13 has a side wall portion 13d, an outer cylindrical portion 13e, a bearing holding portion 13g, and a plug body portion 14. The side wall portion 13d is located on one side in the axial direction of the stator 30, and expands in the radial direction. The side wall portion 13d covers one axial side of the stator 30. That is, the lid 13 covers one side of the stator 30 in the axial direction. The side wall portion 13d is provided with a concave portion 13i that is recessed from one axial side surface of the side wall portion 13d toward the other axial side. A first through hole 13j penetrating the bottom of the recess 13i in the axial direction Y is provided at the bottom of the recess 13i. The first through-hole 13j connects the inside of a pump chamber 46 to be described later and the inside of the housing 10. The outer cylindrical portion 13e has a cylindrical shape extending from the radial outer edge of the side wall portion 13d to the other axial side.

ポンプ A pump chamber 46 is provided in the lid 13. The pump chamber 46 is configured such that the recess 13i provided in the side wall 13d is closed by the plug 14 from one side in the axial direction. The plug body 14 is fixed to a surface on one axial side of the side wall 13d with, for example, a screw. An annular seal 14a is arranged between the side wall 13d and the plug 14 in the axial direction. Although not shown, the seal 14a surrounds the recess 13i when viewed in the axial direction. Thereby, it is possible to suppress the oil O in the pump chamber 46 from leaking outside the housing 10. The center axis J1 passes through the pump chamber 46. As shown in FIG. 3, when viewed in the axial direction, the outer shape of the pump chamber 46 is circular. The pump chamber 46 houses an internal gear 43 and an external gear 42 described later.

The pump chamber 46 is provided with a suction port 44 from which the oil O can be sucked into the pump chamber 46 from inside the housing section 17 and a discharge port 45 from which the oil O can be discharged from inside the pump chamber 46. The suction port 44 and the discharge port 45 are, for example, circular. The suction port 44 is arranged below the discharge port 45. The suction port 44 is arranged below the central axis J1. Discharge port 45 is arranged above central axis J1.

省略する Although not shown, the plug portion 14 has a portion to be inserted into the recess 13i. As shown in FIG. 3, a connection oil passage 13 n into which oil O from the discharge port 45 flows is provided in a portion of the plug portion 14 inserted into the recess 13 i. The connection oil passage 13n is connected to a second oil passage 20b described later via the connection port 13p. The connection port 13p is, for example, circular.

As shown in FIG. 2, the lid 13 has a first oil passage 13a. In the present embodiment, the first oil passage 13a is provided on the side wall 13d. More specifically, the first oil passage 13a is
It is provided in the lower part of d. The first oil passage 13a has a vertically extending portion 13k and an axially extending portion 13m.

The vertical extension 13k is a portion extending upward from the lower end of the side wall 13d. The upper end of the vertically extending portion 13k is connected to the pump chamber 46 on the other axial side of the pump chamber 46. The portion of the pump chamber 46 to which the vertically extending portion 13k is connected is the suction port 44. A seal bolt 13c is provided at a lower end of the vertically extending portion 13k. The seal bolt 13c closes and seals the lower end of the vertically extending portion 13k. Thereby, it is possible to suppress the oil O in the housing portion 17 from leaking outside the housing 10.

The axially extending portion 13m extends from the surface on the other side in the axial direction of the side wall portion 13d to one side in the axial direction, and is connected to the vertically extending portion 13k. The other end in the axial direction of the axially extending portion 13m is an opening 13h that opens into the housing portion 17. That is, the first oil passage 13a has the opening 13h. As a result, the first oil passage 13a is exposed and opened to the housing portion 17, and connects the inside of the housing portion 17 and the suction port 44.

において In the present embodiment, the opening 13h is located below the liquid level OS of the oil O stored in the storage portion 17. Thereby, the opening 13 h is exposed to the oil O stored in the storage 17. In the present embodiment, when the pump unit 40 is driven, the oil O in the storage unit 17 flows into the first oil passage 13a from the opening 13h. The oil O flowing into the first oil passage 13a is sent to the rotor 20 and the stator 30 via the pump chamber 46, the connection oil passage 13n, and a second oil passage 20b described later.

ス A strainer 13b is provided in the first oil passage 13a. In the present embodiment, the strainer 13b is provided inside a portion of the vertically extending portion 13k located above the axially extending portion 13m. The oil O sent from the accommodation section 17 to the pump chamber 46 through the first oil passage 13a passes through the strainer 13b. The strainer 13b can remove foreign matter contained in the oil O sent from the storage section 17 to the pump chamber 46. Therefore, it is possible to prevent foreign matter from entering the pump chamber 46.

The bearing holding portion 13g is provided at a radially central portion of the side wall portion 13d. The bearing holding portion 13g holds the bearing 70 inside. That is, the lid 13 holds the bearing 70. A pump chamber 46 is provided on one axial side of the bearing holding portion 13g.

ウォー As shown in FIGS. 2, 4, and 5, the water jacket 60 is a cylindrical member that entirely surrounds the central axis J1. The water jacket 60 is a part of the housing 10. The outer peripheral surface of the water jacket 60 is in contact with the inner peripheral surface of the second cylindrical portion 11b of the main body 11. The stator 30 is fixed to the inner peripheral surface of the water jacket 60.

The water jacket 60 has a first cylindrical portion 61, a mounting portion 62, and a fin portion 63. That is, the housing 10 includes the first cylindrical portion 61, the mounting portion 62, and the fin portion 63. As shown in FIG. 2, the first cylindrical portion 61 supports the stator 30 from the outside in the radial direction. In the present embodiment, the first cylindrical portion 61 has a cylindrical shape that opens on both sides in the axial direction Y about the central axis J1. The first cylindrical portion 61 is located radially inside the second cylindrical portion 11b. The outer peripheral surface of the first cylindrical portion 61 is the outer peripheral surface of the water jacket 60. A groove 61 a extending in the circumferential direction R is provided on the outer peripheral surface of the first cylindrical portion 61. Although not shown, the groove 61a has a C-shape when viewed in the axial direction. The groove 61a forms a cooling channel 90 described later.

In the present embodiment, the first tubular portion 61 of the water jacket 60 and the second tubular portion 11b of the main body portion 11 are overlapped in the radial direction to form a tubular portion 10a that supports the stator 30 from the outside in the radial direction. . That is, in the present embodiment, the housing 10 has a first cylindrical portion 61 and a cylindrical portion 10a having a second cylindrical portion 11b located radially outside the first cylindrical portion 61. The tubular portion 10a is a tubular shape that opens on one side in the axial direction. The opening on one side in the axial direction of the cylindrical portion 10 a is closed by the lid 13. The cylindrical part 10a forms a part of the housing part 17.

The mounting portion 62 has a flange shape that extends radially outward from one axial end of the first cylindrical portion 61. As shown in FIG. 4, the mounting portion 62 surrounds the central axis J1. The mounting portion 62 has a protrusion 62a that protrudes in a trapezoidal shape on the upper side. The protruding part 62a is a part located on the upper side of the mounting part 62. The protrusion 62a is provided with a hole 62c that penetrates the protrusion 62a in the axial direction Y. As shown in FIG. 2, the hole 62c faces the opening on one axial side of the wiring housing 11e. The mounting portion 62 is sandwiched between the opening edge of the main body 11 and the opening edge of the lid 13 in the axial direction Y.

取付 As shown in FIG. 4, the mounting portion 62 is provided with a plurality of mounting holes 62b at intervals in the circumferential direction R. The mounting hole 62b penetrates the mounting portion 62 in the axial direction Y. A screw is passed through each of the mounting holes 62b from one axial side. The screw passed through the mounting hole 62b penetrates the flange provided on the lid 13 and is fastened to the opening edge of the main body 11. As a result, the water jacket 60 and the lid 13 are fixed to the main body 11 together with the screw together.

フィン As shown in FIG. 5, the fin portion 63 protrudes from the one axial end of the first cylindrical portion 61 to one axial side. As shown in FIG. 2, the fin portion 63 protrudes toward one side in the axial direction toward the lid portion 13 and faces the lid portion 13 in the axial direction Y. As shown in FIG. 5, in the present embodiment, a plurality of fin portions 63 are provided along a circumferential direction R centered on the central axis J1. The fin portion 63 has, for example, a substantially rectangular plate shape whose plate surface faces the circumferential direction R.

において In the present embodiment, the plurality of fin portions 63 are provided in a lower portion of the first cylindrical portion 61. The plurality of fin portions 63 are located below the central axis J1. The plurality of fin portions 63 are arranged, for example, at equal intervals along an arc shape passing through the lowermost end of the cylindrical first tubular portion 61. Of the plurality of fin portions 63, the fin portion 63 located on one side in the circumferential direction and the fin portion 63 located on the other side in the circumferential direction are arranged at the same position in the vertical direction Z, for example.

フィン As shown in FIG. 2, the fin portion 63 protrudes into the housing portion 17. The fin portion 63 is located below the liquid level OS of the oil O stored in the storage portion 17. That is, the fin portion 63 is immersed in the oil O stored in the storage portion 17. The fin portion 63 protrudes to one axial side from a coil end 32a of the stator 30 described later. The distance in the axial direction Y between one end of the fin portion 63 in the axial direction and the lid 13 is shorter than the distance in the axial direction Y between the coil end 32a and the lid 13.

において In the present embodiment, at least a part of the fin portion 63 faces the opening 13h. In this specification, “at least a part of the fin portion faces the opening” means that at least a part of at least one fin portion faces the opening. In the present embodiment, of the plurality of fin portions 63, some of the fin portions 63 provided at the lower end of the first cylindrical portion 61 face the opening 13h.

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 20a has a motor shaft main body 21 and a mounting member 50. The rotor core 22 is attached to the motor shaft main body 21. The portion of the motor shaft main body 21 to which the rotor core 22 is attached is a large diameter portion 21a.

端 One end in the axial direction of the motor shaft main body 21 is rotatably supported by the bearing 70. Further, a portion of the motor shaft main body 21 located on the other axial side than the rotor core 22 is rotatably supported by the bearing 71. Therefore, the

bearings

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

bearings

70 and 71 are, for example, ball bearings. The other end in the axial direction of the motor shaft main body 21 is an output shaft portion 21b that penetrates the bottom portion 11a in the axial direction Y and projects outside the housing 10. The outer diameter of the output shaft portion 21b is smaller than the outer diameter of the large diameter portion 21a.

The motor shaft main body 21 has a flange portion 21f. The flange portion 21f is provided on a portion of the motor shaft main body 21 that is located on the other axial side than the rotor core 22. The flange portion 21f protrudes radially outward from the large diameter portion 21a of the motor shaft main body 21 to which the rotor core 22 is fixed. The flange portion 21f has an annular plate shape. The motor shaft main body 21 has a hole 21g extending from one axial end of the motor shaft main body 21 to the other axial side. The hole 21g is a bottomed hole that opens on one side in the axial direction. That is, the other axial end of the hole 21g is closed.

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

The mounting member 50 has a fitting portion 51 and a fixing portion 52. The fitting portion 51 is a portion fitted into the hole 21g. The fitting portion 51 is fixed to the inner peripheral surface of one end of the hole 21g in the axial direction, and extends from the inside of the hole 21g to one axial side of the motor shaft main body 21. One end in the axial direction of the fitting portion 51 is inserted into the first through hole 13j. That is, at least a part of the fitting portion 51 is inserted into the first through hole 13j. Therefore, the radial gap between the outer peripheral surface of the mounting member 50 and the inner peripheral surface of the first through hole 13j can be increased. Thereby, even when the position of the mounting member 50 is shifted in the radial direction due to vibration or the like, it is possible to suppress the mounting member 50 from contacting the inner peripheral surface of the first through hole 13j.

The fixing portion 52 is located on one axial side of the fitting portion 51. The fixing portion 52 is connected to an end of the fitting portion 51 on one side in the axial direction. The outer diameter of the fixing part 52 is larger than the outer diameter of the fitting part 51 and smaller than the inner diameter of the first through hole 13j. The fixing part 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.

外 An external gear 42 described below is fixed to the mounting member 50. In the present embodiment, the external gear 42 is fixed to a radially outer surface of the fixing portion 52. More specifically, as shown in FIG. 3, the fixing portion 52 is fitted and fixed to a fixing hole 42 b penetrating the external gear 42 in the axial direction Y. As described above, according to the present embodiment, the fitting part 51 having an outer diameter smaller than the fixing part 52 is fitted into the hole 21g, and the external gear 42 is fitted to the fixing part 52 having the outer diameter larger than the fitting part 51. Fix it. Therefore, the inner diameter of the hole 21g can be smaller than the inner diameter of the fixing hole 42b of the external gear 42. Accordingly, the inner diameter of the hole 21g can be relatively easily reduced, and a decrease in the rigidity of the motor shaft 20a can be suppressed.

As shown in FIG. 2, the motor shaft 20a has a second oil passage 20b provided inside the motor shaft 20a. The second oil passage 20b is a bottomed hole extending from one end in the axial direction of the motor shaft 20a to the other axial side. The second oil passage 20b opens on one side in the axial direction. The second oil passage 20b is provided to extend from one axial end of the mounting member 50 to the other axial end. The second oil passage 20b is configured by connecting the inside of the mounting member 50 and the hole 21g in the axial direction Y. That is, the radial inner surface of the mounting member 50 forms a part of the radial inner surface of the second oil passage 20b.

において In the present embodiment, the inner edge of the second oil passage 20b has a circular shape centered on the central axis J1 in a cross section orthogonal to the axial direction Y. The inside diameter of the portion provided on the mounting member 50 in the second oil passage 20b is smaller than the inside diameter of the portion provided on the motor shaft 20a in the second oil passage 20b. That is, the inner diameter of the mounting member 50 is smaller than the inner diameter of the hole 21g. The second oil passage 20b is connected to the connection oil passage 13n by connecting the opening on one axial side of the attachment member 50 to the connection opening 13p. That is, the second oil passage 20b opens to the connection oil passage 13n at one axial end of the motor shaft 20a. The second oil passage 20b is connected to the discharge port 45 via the connection oil passage 13n.

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

holes

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

holes

26a and 26b are arranged between the nut 27 for fixing the first end plate 24 and the second end plate 25 and the flange 21f in the axial direction Y. The radially outer end of the second through-hole 26a opens in a gap in the axial direction Y between the first end plate 24 and the rotor core 22. A radially outer end of the second through-hole 26b opens in a gap in the axial direction Y between the second end plate 25 and the rotor core 22.

径 A radially outer end portion of the second through hole 26c is opened on a radially outer surface of a portion of the motor shaft 20a located between the bearing 70 and a later-described detection portion 81 in the axial direction Y. A radially outer end of the second through hole 26d opens radially inward of the bearing holding portion 11c on the other axial side of the bearing 71. For example, a plurality of second through holes 26a to 26d are provided along the circumferential direction R, respectively. The second through-hole 26c may be opened radially inside the bearing holding portion 13g on one axial side of the bearing 70.

The rotor core 22 has, for example, an annular shape centered on the central axis J1. The rotor core 22 has a magnet insertion hole 22a penetrating the rotor core 22 in the axial direction Y. The plurality of magnet insertion holes 22a are provided, for example, along the circumferential direction R. The magnets 23 are respectively inserted into the plurality of magnet insertion holes 22a. The magnet 23 is bonded to the rotor core 22 by, for example, an adhesive. Note that the method of fixing the magnet 23 is not limited to bonding.

The first end plate 24 and the second end plate 25 are ring-shaped plates that expand in the radial direction. The motor shaft 20a 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 Y while being in contact with the rotor core 22. The first end plate 24 is arranged on one axial side of the rotor core 22. The first end plate 24 has an ejection groove (not shown). The second end plate 25 is arranged on the other axial side of the rotor core 22. The second end plate 25 has an ejection groove. The ejection grooves provided in the first end plate 24 and the second end plate 25 respectively extend in the radial direction.

The first end plate 24, the rotor core 22, and the second end plate 25 are held in the axial direction Y by the nut 27 and the flange 21f. The nut 27 presses the first end plate 24, the rotor core 22, and the second end plate 25 against the flange portion 21f by being screwed into a male screw portion provided on the outer peripheral surface of the motor shaft 20a. Thereby, the first end plate 24, the rotor core 22, and the second end plate 25
It is fixed to the motor shaft 20a.

The stator 30 faces the rotor 20 with a gap in the radial direction. The stator 30 has a stator core 31 and a plurality of coils 32 mounted on the stator core 31. Stator core 31 has an annular shape centered on central axis J1. A radially outer surface of the stator core 31 is fixed to an inner peripheral surface of the water jacket 60. The stator core 31 faces radially outside the rotor core 22 via a gap.

において In the present embodiment, the radial outer surface of the stator 30 corresponds to the radial outer surface of the stator core 31. The radial outer surface of the stator core 31 contacts the inner peripheral surface of the first cylindrical portion 61 of the water jacket 60. More specifically, stator core 31 is fixed to water jacket 60 by, for example, press fitting or shrink fitting.

The coil 32 is wound around the stator core 31. One end of the coil 32 on one side in the axial direction is a coil end 32a, and projects to one side in the axial direction from the one end of the stator core 31 on one side in the axial direction. That is, the coil 32 has a coil end 32a that projects to one side in the axial direction from the stator core 31. The other end of the coil 32 on the other side in the axial direction is a coil end 32b, which protrudes from the other end of the stator core 31 on the other side in the axial direction.

導電 A conductive bus bar 101 and a bus bar holder 33 are arranged at positions adjacent to the coil end 32a. The bus bar 101 is held by the bus bar holder 33 and is provided from a position adjacent to the coil end 32a to a position adjacent to the cable connection portion 102. In the bus bar 101, an end of the coil 32 is connected to one end of the bus bar 101, and a cable connection unit 102 is connected to the other end of the bus bar 101, thereby conducting the coil 32 and the cable connection unit 102. The cable connection unit 102 is disposed in the wiring housing 11e. Although not shown, the cable connection unit 102 is connected to the connector 100. Power is supplied to the connector 100 from a power supply (not shown). Thereby, electric power is supplied from the connector 100 to the coil 32 via the cable connection unit 102 and the bus bar 101.

回転 The rotation detecting section 80 shown in FIG. 2 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 detecting section 80 is arranged radially inside the outer cylindrical section 13e. The rotation detecting section 80 has a detected section 81 and a sensor section 82. The detected part 81 is an annular shape extending in the circumferential direction R. The detected part 81 is fitted and fixed to the motor shaft 20a. The detected part 81 is made of a magnetic material.

The sensor unit 82 is disposed between the rotor core 22 and the lid 13 in the axial direction Y. The sensor section 82 has an annular shape surrounding the detected section 81 in the radial direction. The sensor unit 82 has a plurality of coils along the circumferential direction R. As 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. The sensor unit 82 detects the rotation of the detected unit 81 by detecting the induced voltage. Thereby, the rotation detecting section 80 detects the rotation of the motor shaft 20a and detects the rotation of the rotor 20.

The pump section 40 is provided at the center of the lid section 13. The pump section 40 is disposed on one axial side of the motor shaft 20a. The pump section 40 in the present embodiment is a so-called mechanical oil pump. The pump section 40 has 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 section 48. The external gear 42 is a gear that can rotate around the central axis J1. The external gear 42 is fixed to one axial end of the motor shaft 20a. The external gear 42 is housed in a pump chamber 46. As shown in FIG. 3, the external gear 42 has a plurality of teeth 42a on the outer peripheral surface. The tooth shape of the tooth portion 42a of the external gear 42 is a trochoid tooth shape.

The internal gear 43 is an annular gear rotatable around a rotation axis J2 that is eccentric with respect to the center axis J1. The internal gear 43 is housed in a pump chamber 46. The internal gear 43 surrounds the outside of the external gear 42 in the radial direction, and meshes with the external gear 42. The internal gear 43 has a plurality of teeth 43a on the inner peripheral surface. The tooth shape of the tooth portion 43a of the internal gear 43 is a trochoid tooth shape. As described above, 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 trochoid tooth shapes, 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 inserting the internal gear 43 and the external gear 42 from the opening on the one side in the axial direction of the recess 13i, the plug 14 closes the opening on the one side in the axial direction of the recess 13i. The chamber 46 can be configured, and the internal gear 43 and the external gear 42 can be housed in the pump chamber 46. Therefore, assembly of the pump section 40 can be facilitated.

吸入 As described above, the suction port 44 is connected to the first oil passage 13a. As shown in FIG. 6, the suction port 44 opens on 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 is used to supply the oil O stored in the housing 17 from the opening 13h through the first oil passage 13a to the inside of the pump chamber 46, more specifically, the gap between the external gear 42 and the internal gear 43. Can be inhaled. As shown in FIG. 3, the suction port 44 is disposed above the lower end of the storage section 48 and above the lower end of the external gear 42.

吐出 As described above, the discharge port 45 is connected to the second oil passage 20b via the connection oil passage 13n. As shown in FIG. 6, 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 storage part 48 is connected to the pump chamber 46 on one axial side of a vertically lower region of the pump chamber 46. As shown in FIG. 3, the shape of the storage portion 48 is a bow shape that is convex 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 section 48.

Since the suction port 44 is disposed above the lower end of the storage section 48, at least a portion of the oil O flowing into the storage section 48 is discharged from the suction port 44 even when the pump section 40 is stopped. It is stored in the storage part 48 without returning to the storage part 17. Thus, when the pump unit 40 is stopped, the lower part of the external gear 42 and the lower part of the internal gear 43 in the pump chamber 46 are in contact with the oil O in the storage part 48. Can be Therefore, when the pump section 40 is driven again, the gap between the tooth section 42a of the external gear 42 and the tooth section 43a of the internal gear 43, and the inner peripheral surface of the pump chamber 46 and the outer peripheral surface of the internal gear 43 Oil O can be interposed therebetween, and the occurrence of 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. Thereby, the internal gear 43 meshing with the external gear 42 rotates, and the oil O sucked into the pump chamber 46 from the suction port 44 passes through between the external gear 42 and the internal gear 43, It is sent to the discharge port 45. Thus, the pump unit 40 is driven via the motor shaft 20a. The oil O discharged from the discharge port 45 flows into the connection oil passage 13n, and flows from the connection port 13p into the second oil passage 20b. As shown by the arrow in FIG. 6, the oil O flowing into the second oil passage 20b receives a radially outward force due to the centrifugal force of the rotating motor shaft 20a, passes through the second through holes 26a to 26d, and It flows out of the shaft 20a.

In the present embodiment, the second through

holes

26a and 26b open toward the gap between the first end plate 24 and the rotor core 22 and the gap between the second end plate 25 and the rotor core 22, respectively. The oil O flowing out of the

holes

26a and 26b is jetted radially outward from jet slots (not shown) provided in each end plate.

オイル The oil O spouted radially outward from the spout groove is sprayed onto the coil 32. Thereby, the coil 32 can be cooled by the oil O. In the present embodiment, since the second oil passage 20b is provided inside the motor shaft 20a, the rotor 20 can be cooled by the oil O before being ejected from the ejection groove. As described above, the oil O discharged from the discharge port 45 in the present embodiment is guided to the rotor 20 and the stator 30.

ため Since the second through

holes

26c and 26d open radially inward near the

bearings

70 and 71, respectively, the oil O flowing out of the second through

holes

26c and 26d is supplied to the

bearings

70 and 71, respectively. Thus, the oil O can be used as a lubricant for the

bearings

70 and 71.

As described above, the pump section 40 can be driven by the rotation of the motor shaft 20a, and the pump section 40 sucks up the oil O stored in the housing 10 and supplies it to the rotor 20, the stator 30, and the

bearings

70 and 71. be able to. That is, the pump unit 40 sends the oil O stored in the storage unit 17 to at least one of the stator 30 and the rotor 20. Thus, the rotor 20 and the stator 30 can be cooled using the oil O stored in the housing 10, and the lubricity between the

bearings

70, 71 and the motor shaft main body 21 can be improved.

According to the present embodiment, the connection oil passage 13n and the second oil passage 20b can provide the oil O discharged from the discharge port 45 to the inside of the motor shaft 20a. Further, since the second through holes 26a to 26d are provided, the oil O flowing into the second oil passage 20b can be supplied to the stator 30 and the

bearings

70 and 71.

According to the present embodiment, the second oil passage 20b provided in the motor shaft 20a opens to the connection oil passage 13n connected to the discharge port 45 at one axial end of the motor shaft 20a. Since the external gear 42 is fixed to one axial end of the motor shaft 20a, one axial end of the motor shaft 20a is disposed relatively close to the discharge port 45. Therefore, the length of the connection oil passage 13n connecting the discharge port 45 and the second oil passage 20b can be shortened. Therefore, according to the present embodiment, it is easy to shorten the entire length of the oil passage from the opening 13h to the second oil passage 20b. Thereby, the oil O is easily sent to the second oil passage 20b provided inside the motor shaft 20a. Further, the structure of the motor 1 can be easily simplified, and the manufacture of the motor 1 can be facilitated.

The oil O supplied to the stator 30 and the

bearings

70 and 71 falls in the housing 17 and is again stored in the lower region of the housing 17. Thereby, the oil O in the storage section 17 can be circulated by the pump section 40.

The motor 1 is further provided with a cooling channel 90 through which the refrigerant flows. The cooling channel 90 is provided in the cylindrical portion 10a. That is, the cylindrical portion 10a that supports the stator 30 from the outside in the radial direction has the cooling passage 90 through which the refrigerant flows. Here, as described above, the oil O is stored in the housing portion 17 in which the stator 30 is housed. Therefore, the oil O stored in the storage portion 17 can be cooled by flowing the refrigerant through the cooling channel 90 provided in the cylindrical portion 10a. Thereby, the oil O can be cooled without being led out of the housing 10. Therefore, it is not necessary to provide an oil passage or the like for leading the oil O to the outside of the housing 10, so that the structure of the motor 1 can be prevented from becoming complicated. Further, since it is not necessary to lead the oil O to the outside of the housing 10, the housing 10 is easily sealed.

As described above, according to the present embodiment, the motor 1 that can suitably cool the oil O stored in the housing 10 with a simple structure is obtained. By supplying oil O to the stator 30 and the rotor 20 and the like by the pump section 40 as described above, the stator 30 and the rotor 20 and the like can be suitably cooled by the suitably cooled oil O. The refrigerant flowing through the cooling channel 90 is not particularly limited as long as it is a fluid that can cool the oil O. The refrigerant may be water, a liquid other than water, or a gas.

According to the present embodiment, the cooling channel 90 is provided in the cylindrical portion 10a that supports the stator 30 from the radial outside. Therefore, the stator 30 can be directly cooled by the refrigerant flowing through the cooling channel 90. Further, since the oil O is stored in the housing 10, the rotor 20 is easily cooled by circulating the oil O in the housing 10. Further, as shown in FIG. 2, a part of the stator 30 can be immersed in the stored oil O, so that the stator 30 can be cooled more easily. In particular, since a part of the coil 32 serving as a heating element can be cooled by being immersed in the stored oil O, the stator 30 can be suitably cooled.

In the present embodiment, the axial direction Y is orthogonal to the vertical direction Z. Therefore, for example, as compared with the case where the axial direction Y is parallel to the vertical direction Z, the portion of the stator 30 immersed in the stored oil O is easily enlarged, and the stator 30 is easily cooled. Further, it is easy to arrange the liquid level OS of the oil O below the rotor 20 at least when the rotor 20 is rotating, so that when the rotor 20 rotates, the oil O prevents the rotation resistance of the rotor 20 from becoming a resistance. it can.

According to the present embodiment, the housing 10 has the fin portion 63 protruding into the housing portion 17. Therefore, the fin portion 63 can be brought into contact with the oil O stored in the housing portion 17. Thereby, the contact area between the housing 10 and the oil O can be increased. Therefore, the heat of the oil O is easily transferred to the housing 10 via the fin portion 63, and the oil O is easily cooled. In particular, in the present embodiment, since the cooling channel 90 is provided in the cylindrical portion 10 a of the housing 10, heat transferred from the oil O to the housing 10 via the fin portion 63 can be easily transferred to the refrigerant flowing through the cooling channel 90. . Therefore, the oil O can be cooled more efficiently.

According to the present embodiment, the fin portion 63 is provided on the first tubular portion 61 constituting the tubular portion 10a. Therefore, the heat transferred to the housing 10 via the fin portion 63 can be easily transferred to the refrigerant flowing through the cooling channel 90 provided in the cylindrical portion 10a. Thereby, the oil O can be cooled more efficiently through the fin portion 63.

According to the present embodiment, the plurality of fin portions 63 are provided in a lower portion of the cylindrical portion 10a. Therefore, the fin portion 63 is easily arranged below the liquid surface OS of the oil O, and the fin portion 63 is easily brought into contact with the oil O. Thereby, the oil O can be more appropriately cooled through the fin portion 63.

Further, according to the present embodiment, the fin portion 63 protrudes toward one side in the axial direction toward the lid portion 13 and faces the lid portion 13 in the axial direction. For this reason, the oil O in the housing portion 17 heading toward the first oil passage 13 a provided in the lid portion 13 is easily brought into contact with the fin portion 63. Thereby, the oil O heading to the first oil passage 13a can be suitably cooled. Therefore, the temperature of the oil O ejected into the housing 10 through the first oil passage 13a can be appropriately lowered, and the entire motor 1 can be efficiently cooled.

According to the present embodiment, at least a part of the fin portion 63 faces the opening 13h of the first oil passage 13a. Therefore, the oil O heading toward the first oil passage 13a can be more appropriately brought into contact with the fin portion 63. Thus, the oil O flowing into the first oil passage 13a from the opening 13h can be cooled more efficiently. Therefore, the temperature of the oil O ejected into the housing 10 through the first oil passage 13a can be appropriately lowered, and the entire motor 1 can be cooled more efficiently.

According to the present embodiment, the fin portion 63 protrudes from the cylindrical portion 10a to one side in the axial direction beyond the coil end 32a of the stator 30. Therefore, the length of the fin portion 63 in the axial direction Y is easily increased, and the contact area between the fin portion 63 and the oil O is easily increased. Thereby, the heat of the oil O can be efficiently transferred to the housing 10.

Further, according to the present embodiment, the distance in the axial direction Y between the one end in the axial direction of the fin portion 63 and the lid 13 is equal to the distance in the axial direction Y between the coil end 32 a and the lid 13. Shorter than the distance. With this configuration, the length of the fin portion 63 in the axial direction Y can be easily increased, and the contact area between the fin portion 63 and the oil O can be easily increased. Therefore, the heat of the oil O can be efficiently transferred to the housing 10.

において In the present embodiment, the cooling channel 90 is disposed between the first cylindrical portion 61 and the second cylindrical portion 11b in the radial direction. Therefore, by combining the two cylindrical members, the cooling channel 90 can be easily configured. In the present embodiment, the cooling flow channel 90 is configured such that the radially outer opening of the groove 61a provided on the outer peripheral surface of the first cylindrical portion 61 is closed by the flow channel forming portion 11d of the second cylindrical portion 11b. You.

冷却 As shown in FIG. 7, the cooling channel 90 extends in the circumferential direction R. Therefore, it is easy to surround the periphery of the stator 30 by the cooling channel 90, and the stator 30 can be more appropriately cooled by the refrigerant flowing through the cooling channel 90. In the present embodiment, the cooling channel 90 extends in a wavy shape in the circumferential direction R. Thereby, the refrigerant flowing through the cooling flow path 90 can be caused to flow in the circumferential direction R while moving in the axial direction Y, and the stator 30 and the oil O can be more appropriately cooled. At least a part of the cooling channel 90 is located above the liquid level OS of the oil O contained in the containing part 17. Therefore, the portion of the stator 30 that is not immersed in the oil O in the housing portion 17 can be cooled by the refrigerant flowing through the cooling channel 90.

The cooling passage 90 includes a plurality of

first passages

91a, 91b, 91c, 91d, 91e, and 91f extending in the axial direction Y, and a plurality of

second passages

92a, 92b, extending in the circumferential direction R of the stator 30. 92c, 92d, and 92e. The plurality of first flow path portions 91a to 91f are arranged side by side along the circumferential direction R. The plurality of first

flow passage portions

91a, 91b, 91c, 91d, 91e, 91f are arranged in this order from one circumferential side starting from the first flow passage portion 91a to the other circumferential side. One end in the axial direction of the first flow path portion 91a is disposed on one axial side with respect to one end in the axial direction of the first flow path portions 91b to 91f. The other axial ends of the first flow passage portions 91a to 91f are arranged at the same position in the axial direction Y.

The second flow path portion 92a connects an end on the other axial side of the first flow path portion 91a to an end on the other axial side of the first flow path portion 91b. The second flow path portion 92b connects one end in the axial direction of the first flow path portion 91b to one end in the axial direction of the first flow path portion 91c. The second flow path portion 92c connects the other end in the axial direction of the first flow path portion 91c to the other end in the axial direction of the first flow path portion 91d. The second flow path portion 92d connects an axial end of the first flow path portion 91d to an axial end of the first flow path portion 91e. The second flow passage portion 92e connects the other axial end of the first flow passage portion 91e to the other axial end of the first flow passage portion 91f.

As described above, the plurality of first flow path portions 91a to 91f are connected to each other. Therefore, the cooling flow path 90 can be formed in a wave shape while the refrigerant flows in the axial direction Y inside the first flow path portions 91a to 91f. The plurality of second flow paths 92a to 92e extend in the circumferential direction R along the radially outer side of the stator 30. Thereby, the stator 30 and the oil O can be more appropriately cooled by the refrigerant flowing through the cooling passage 90. In the first flow passage portions 91a to 91f adjacent to each other in the circumferential direction R, the directions of the refrigerant flowing inside are opposite to each other.

冷却 As shown in FIG. 2, the cooling flow path 90 overlaps the stator 30 and the rotor 20 when viewed along the vertical direction Z. One end in the axial direction of the cooling flow path 90 and the other end in the axial direction of the cooling flow path 90 overlap the stator core 31 when viewed along the vertical direction Z.

において In the present embodiment, the cooling flow channel 90 extends along the circumferential direction R outside the stator core 31 of the stator 30 in the radial direction. Further, substantially the entire outer circumference in the radial direction of the stator core 31 contacts the water jacket 60. Thereby, the stator core 31 can be more efficiently cooled by the refrigerant flowing through the cooling passage 90. Further, for example, as compared with the case where the cooling flow path is formed inside the stator core, the manufacturing of the cooling flow path 90 is easier.

As shown in FIG. 7, the cooling channel 90 has an inflow channel 93a and an outflow channel 93b. The inflow channel 93a extends in the width direction X from the surface on the other side in the width direction of the second cylindrical portion 11b to an end on one side in the axial direction of the first channel portion 91a. The opening on the other side in the width direction of the inflow channel 93a is an inflow port 93c into which the refrigerant flows. That is, the cooling channel 90 has the inflow port 93c. The inflow port 93c opens on the other surface in the width direction of the second cylindrical portion 11b. As shown in FIG. 1, the inflow nozzle portion 15 is provided at the inflow port 93c so as to project from the second cylindrical portion 11b to the other side in the width direction.

As shown in FIG. 7, the outflow channel 93b extends in the width direction X from the other surface in the width direction of the second cylindrical portion 11b to one axial end of the first channel portion 91f. The opening on the other side in the width direction of the outflow channel 93b is an outflow port 93d through which the refrigerant flows out. That is, the cooling channel 90 has an outlet 93d. The outlet 93d opens on the other surface in the width direction of the second cylindrical portion 11b. As shown in FIG. 1, the outlet 93d is provided with an outflow nozzle portion 16 protruding from the second cylindrical portion 11b to the other side in the width direction.

As described above, the inflow port 93c and the outflow port 93d open in the width direction X. Therefore, the inflow port 93c and the outflow port 93d are more easily provided than when the inflow port and the outflow port open in the axial direction Y or the vertical direction Z. In the present embodiment, the inflow port 93c and the outflow port 93d are provided on the same side of the housing 10 in the width direction X, so that the refrigerant can easily flow into and out of the cooling flow path 90. The inflow port 93c and the outflow port 93d are arranged side by side in the vertical direction Z. The inflow port 93c is located above the outflow port 93d. The vertical position of the inflow port 93c and the vertical position of the outflow port 93d may be the same.

The refrigerant that has flowed into the inflow channel 93a from the inflow nozzle portion 15 via the inflow port 93c passes through the first flow channel portion 91a and the first flow channel portion and the second flow channel portion, respectively. The part 91f flows into the outflow channel 93b. Then, the refrigerant flowing into the outflow channel 93b flows out of the cooling channel 90 from the outflow nozzle portion 16 through the outflow port 93d. In this way, the refrigerant circulates through the cooling channel 90.

モータ The above-described motor 1 of the present embodiment is mounted on, for example, a driving device 2 shown in FIG. The drive device 2 is mounted on a vehicle and rotates wheels of the vehicle. The drive device 2 includes a motor 1, a speed reduction device 3, a differential device 4, and a gear housing 6. The gear housing 6 houses the reduction gear 3 and the differential 4 therein. The gear housing 6 is fixed to the housing 10 of the motor 1. Oil O is stored inside the gear housing 6.

The reduction gear 3 is connected to the motor 1. The reduction gear transmission 3 is connected to the output shaft 21b of the motor shaft 20a. The reduction gear 3 reduces the rotation speed of the motor 1 and increases the torque output from the motor 1 according to the reduction ratio. The reduction gear transmission 3 transmits the torque output from the motor 1 to the differential gear 4. The reduction gear transmission 3 has a first gear 3a, a second gear 3b, a third gear 3c, and an intermediate shaft 3d.

The first gear 3a is fixed to the outer peripheral surface of the output shaft 21b. The intermediate shaft 3d is arranged at a position radially outwardly away from the central axis J1 and extends in the axial direction Y. The second gear 3b and the third gear 3c are fixed to the outer peripheral surface of the intermediate shaft 3d. The second gear 3b and the third gear 3c are connected via an intermediate shaft 3d. The second gear 3b and the third gear 3c rotate around the central axis of the intermediate shaft 3d. The second gear 3b meshes with the first gear 3a. The third gear 3c meshes with a ring gear 4a described later of the differential device 4.

トルク The torque output from the motor 1 is transmitted to the differential 4 via the reduction gear 3. More specifically, the torque output from the motor 1 is transmitted through the motor shaft 20a, the first gear 3a, the second gear 3b, the intermediate shaft 3d, and the third gear 3c in this order. 4a. The gear ratio of each gear and the number of gears can be variously changed according to the required reduction ratio. In the present embodiment, the reduction gear 3 is a parallel shaft gear type reduction gear in which the axes of the respective gears are arranged in parallel.

The differential 4 is connected to the speed reducer 3. Thus, the differential 4 is connected to the motor 1 via the speed reducer 3. The differential device 4 is a device that transmits torque output from the motor 1 to wheels of a vehicle. The differential device 4 transmits the same torque to the axles 5 of the left and right wheels while absorbing the speed difference between the left and right wheels when the vehicle turns. Thereby, the differential 4 rotates the axle 5.

The differential 4 has a ring gear 4a, a gear housing (not shown), a pair of pinion gears (not shown), a pinion shaft (not shown), and a pair of side gears (not shown). The ring gear 4a meshes with the third gear 3c. Thus, the torque output from the motor 1 is transmitted to the ring gear 4 a via the reduction gear 3. The lower end of the ring gear 4 a is immersed in the oil O stored in the gear housing 6. Accordingly, the oil O is scraped up by the rotation of the ring gear 4a. The scraped-up oil O is supplied to, for example, the reduction gear 3 and the differential 4 as lubricating oil.

The present invention is not limited to the above embodiment, and other configurations can be adopted. The number of fin portions is not particularly limited as long as it is one or more. The fin portion may be provided on the housing. For example, the fin portion may be provided on the second tubular portion, or may be provided on both the first tubular portion and the second tubular portion. The fin portion may be provided on an upper portion of the tubular portion. Further, the fin portion may be provided in a portion other than the cylindrical portion. In this case, for example, the fin portion may be provided on the lid portion 13 of the above-described embodiment, or may be provided on the bottom portion 11a. The shape of the fin is not particularly limited. The fin portion may be cylindrical or polygonal. The plurality of fin portions may have different shapes from each other. The plurality of fin portions may include fin portions that project in different directions.

形状 The shape of the cooling channel 90 is not particularly limited. The cooling channel 90 may not be wavy, for example, may be a wide channel linearly extending in the width direction X, or a wide channel linearly extending in the axial direction Y. Is also good. Further, a plurality of cooling channels 90 may be provided. The flow path cross sections of the first flow path portions 91a to 91f may have the same dimensions and the same shape. The passage cross-sectional area of the cooling passage 90 may be uniform throughout or may be partially different.

流 Furthermore, the inflow port 93c and the outflow port 93d may be opened on opposite sides in the width direction X. In addition, a configuration can be adopted in which each of the inflow port 93c and the outflow port 93d is provided on one of the main body of the housing and the water jacket, and is provided separately from the other of the main body and the water jacket. That is, for example, the inflow port 93c and the outflow port 93d may be provided on the main body of the housing so as to be separated from the water jacket. In this case, the inflow port 93c and the outflow port 93d may be provided in a portion other than the second cylindrical portion in the main body.

Further, in the above-described embodiment, the cooling channel 90 is configured by providing the groove 61 a on the outer peripheral surface of the water jacket 60, but is not limited thereto. For example, a cooling channel may be formed by providing a groove on the inner peripheral surface of the second cylindrical portion 11b and closing the groove with the outer peripheral surface of the water jacket 60. In this case, a groove may not be provided on the outer peripheral surface of the water jacket 60, or a groove facing the groove provided on the inner peripheral surface of the second cylindrical portion 11b may be provided. It is only necessary that the member constituting the cooling channel is in contact with the stator core.

一 One direction in which the central axis extends, that is, the axial direction in which the motor shaft 20a extends, is not particularly limited, and may intersect the vertical direction Z without being orthogonal, or may be parallel to the vertical direction Z. 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 need not be provided. In this case, the oil O flowing out of the second through

holes

26a, 26b may be directly supplied to the coil 32, or a hole connected to the second through

holes

26a, 26b is provided in the rotor core 22, and the rotor core 22 The oil O may be supplied to the coil 32 through the hole. Further, the oil O spouted from the motor shaft 20a may be supplied to the stator core 31.

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

bearings

70 and 71. However, it may not be supplied to any of them. The oil O discharged from the discharge port 45 may be supplied to, for example, the inner surface of the vertically upper region of the housing 17. In this case, the stator 30 can be indirectly cooled by cooling the housing 10. Further, any one or more of the second through holes 26a to 26d may not be provided. The tooth shape of the tooth portion 42a of the external gear 42 and the tooth shape of the tooth portion 43a of the internal gear 43 may be a cycloid tooth shape or an involute tooth shape. Further, the pump section 40 may be configured to send the oil O to one of the stator 30 and the rotor 20. Further, the pump section 40 may not be provided.

The application of the motor according to the above-described embodiment is not particularly limited. The motor of the above-described embodiment is mounted on, for example, a vehicle. Further, it may be used not as a motor but as a generator. In addition, the above-described configurations can be appropriately combined as long as they do not conflict with each other.

DESCRIPTION OF SYMBOLS 1 ... Motor, 10 ... Housing, 10a ... Cylinder part, 11b ... Second cylinder part, 13 ... Lid part, 13
a: first oil passage, 13h: opening, 17: housing, 20: rotor, 20a: motor shaft, 20b: second oil passage, 26a, 26b, 26c, 26d: second through hole (through hole), Reference Signs List 30: stator, 31: stator core, 32: coil, 32a, 32b: coil end, 40: pump unit, 45: discharge port, 46: pump chamber, 61: first cylindrical unit, 63: fin unit, 90: cooling flow Road, J1: central axis, O: oil, R: circumferential direction, Y: axial direction, Z: vertical direction

Claims

A rotor having a motor shaft arranged along a central axis extending in one direction;
A stator radially opposed to the rotor via a gap,
A housing that houses the rotor and the stator and has a housing portion that can store oil;
With
The housing has a cylindrical portion that supports the stator from a radial outside,
The cylindrical portion has a cooling channel through which a refrigerant flows,
The motor, wherein the housing has a fin portion protruding into the housing portion.
The tubular portion is
A first cylindrical portion that supports the stator from a radially outer side;
A second cylindrical portion, which is located radially outside the first cylindrical portion,
Has,
2. The motor according to claim 1, wherein the cooling flow path is disposed between the first cylinder and the second cylinder in a radial direction. 3.
The motor according to claim 2, wherein the fin portion is provided on at least one of the first cylinder portion and the second cylinder portion.
The motor according to any one of claims 1 to 3, wherein the fin portion is provided in a vertically lower portion of the cylindrical portion.
A pump unit driven via the motor shaft,
The pump section,
A pump room,
An inlet capable of sucking oil into the pump chamber from within the housing,
A discharge port capable of discharging oil from the pump chamber,
Has,
The housing has a lid that closes one axial end of the cylindrical portion,
The lid has a first oil passage connecting the inside of the housing and the suction port,
The motor shaft,
A second oil passage provided inside the motor shaft and connected to the discharge port;
A through-hole connecting the second oil passage and the outer peripheral surface of the motor shaft,
Has,
The motor according to any one of claims 1 to 4, wherein the fin portion protrudes toward one side in the axial direction toward the lid portion, and faces the lid portion in the axial direction.
The first oil passage has an opening that opens into the housing section,
The motor according to claim 5, wherein at least a part of the fin portion faces the opening.
The stator is
A stator core,
A coil mounted on the stator core,
Has,
The coil has a coil end projecting to one side in the axial direction from the stator core,
The motor according to any one of claims 1 to 6, wherein the fin portion protrudes from the cylindrical portion to one side in the axial direction from the coil end.
The motor according to any one of claims 1 to 7, wherein the cooling flow path extends in a circumferential direction.
The motor according to claim 8, wherein the cooling flow path extends in a circumferential direction in a wave shape.
The motor according to claim 8, wherein at least a part of the cooling flow path is located vertically above an oil level of oil stored in the storage section.