Motor Unit

Abstract

A motor unit 10 includes a motor 12 and a reducer 14. The motor 12 includes a case 18 having a stator housing 20, a first motor cover 22, and a second motor cover 24. A rotor 40 having a rotor shaft 46 and a stator 60 having a stator core 62 and a stator coil 64 are provided inside the case 18. An oil filter 100 is provided to an outer surface of the first motor cover 22. At least a portion of the bottom half of the oil filter 100 overlaps the top half of the stator core 62 as viewed from the axial direction of the rotor shaft 46. The reducer 14 has an oil reservoir 126 and is provided on a side of the first motor cover 22. An oil pump 130 is provided on an outer surface of the reducer 14.

Description

[Technical field]

[0001] The present invention relates to a motor unit, and more particularly to a motor unit used in an electric vehicle. [Background technology]

[0002] As an example of this type of prior art, a rotating electric machine is disclosed in Patent Document 1. This rotating electric machine includes a coolant passage through which a coolant flows to cool a stator, and a coolant filter provided in the flow path of the coolant passage to remove contamination of the coolant, and the coolant filter is installed on the front surface side of a case that houses the stator. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-154115 A Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, the point of configuring the rotating electric machine compactly is not sufficiently considered.

[0005] Therefore, a primary object of the present invention is to provide a motor unit that can be configured compactly. [Means for solving the problem]

[0006] According to one aspect of the present invention, there is provided a motor unit comprising: a case including a stator housing, a first motor cover provided at an output end of the stator housing, and a second motor cover provided at an anti-output end of the stator housing; a rotor having a rotor shaft and provided within the case; a stator having a stator core provided radially outward of the rotor and a stator coil provided in the stator core, and provided within the case; and an oil filter provided on the outer surface of the first motor cover to purify oil to be supplied into the case, wherein at least a portion of the lower half of the oil filter overlaps with the upper half of the stator core when viewed in the axial direction of the rotor shaft.

[0007] In this invention, the oil filter is provided on the outer surface of the first motor cover so that at least a portion of the lower half of the oil filter overlaps with the upper half of the stator core when viewed in the axial direction of the rotor shaft. This allows the oil filter to be provided on the first motor cover at a position shifted upward from the center of the stator core, that is, by utilizing an empty space that does not interfere with other components. This allows the motor unit to be configured compactly.

[0008] Preferably, the motor unit further includes a reducer having an oil reservoir that receives oil from the case and that is provided on the side of the first motor cover to reduce the rotation of the rotor, and an oil pump provided on the outer surface of the reducer to discharge the oil in the oil reservoir to the outside.In this case, the oil pump for discharging the oil in the oil reservoir of the reducer to the outside is provided on the outer surface of the reducer, so that the motor unit including the oil pump can be configured compactly.

[0009] Preferably, the reducer further includes an output shaft arranged parallel to the rotor shaft, and if a line segment connecting the center of the rotor shaft and the center of the output shaft is defined as a reference line, a perpendicular line perpendicular to the reference line and passing through the center of the rotor shaft is defined as a first perpendicular line, and a perpendicular line perpendicular to the reference line and passing through the center of the output shaft is defined as a second perpendicular line, at least a portion of the oil filter overlaps with a region surrounded by the reference line, the first perpendicular line, and the second perpendicular line when viewed from the axial direction of the rotor shaft. In this case, the region surrounded by the reference line, the first perpendicular line, and the second perpendicular line when viewed from the axial direction of the rotor shaft is likely to be an empty space. Therefore, by providing the oil filter so that at least a portion of the oil filter overlaps with this region, it is possible to effectively utilize the empty space without interfering with other members, and to configure the motor unit compactly.

[0010] More preferably, the oil filter is located above the output shaft. In this case, the oil filter does not interfere with the output from the output shaft of the reducer, and the motor unit can be configured compactly.

[0011] Preferably, the oil filter is located above the rotor shaft, which allows the motor unit to be made compact without interfering with the output from the rotor shaft of the rotor.

[0012] Preferably, the center of the oil filter is located above the outer circumferential surface of the stator coil, so that the oil can easily drip onto the stator coil inside the case via the oil filter.

[0013] More preferably, the motor unit further includes an external pipe having an outward oil passage for supplying oil that has passed through the oil filter into the case, the external pipe being provided on the outside of the stator housing and held by the first motor cover and the second motor cover, and at least a portion of the oil filter overlaps with the external pipe as viewed in the axial direction of the rotor shaft. In this case, the outside of the stator housing where the external pipe is provided and its vicinity tend to be empty space. Therefore, by providing the oil filter so that at least a portion of the oil filter overlaps with the external pipe as viewed in the axial direction of the rotor shaft, it is possible to effectively utilize the empty space without interfering with other components, and to configure the motor unit compactly.

[0014] Preferably, the oil filter has an oil outlet at its end on the first motor cover side, and the first motor cover has an oil passage for communicating the oil outlet with the outgoing oil passage of the external pipe. In this case, oil can be smoothly supplied from the oil outlet provided at the end of the oil filter on the first motor cover side to the outgoing oil passage of the external pipe via the oil passage of the first motor cover.

[0015] In the present invention, the "output side end portion of the stator housing" refers to the axial end portion of the stator housing from which the motor output is taken out.

[0016] The "anti-output end of the stator housing" refers to the axial end of the stator housing on the side from which the motor output is not taken out (the opposite side to the output end). Effect of the Invention

[0017] According to the present invention, a motor unit that can be configured compactly can be obtained. [Brief description of the drawings]

[0018] [Figure 1] 1 is a front perspective view showing a motor unit according to one embodiment of the present invention. [Diagram 2]FIG. 2 is a rear perspective view showing the motor unit of FIG. [Diagram 3] FIG. 2 is a right side view showing the motor unit of FIG. [Figure 4] FIG. 2 is a left side view showing the motor unit of FIG. [Diagram 5] FIG. 2 is a cross-sectional diagram showing the motor unit of FIG. 1; [Figure 6] FIG. [Figure 7] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0020] A motor unit 10 according to an embodiment of the present invention is suitable for use in an electric vehicle. In this embodiment of the present invention, front-rear, left-right, and up-down are defined as the direction in which a rotor 40 (described later) extends being the left-right direction, and the direction from a motor 12 (described later) toward an inverter 16 (described later) being the rearward direction. In the drawings, "Fr" indicates the front, "Rr" indicates the rearward direction, "R" indicates the rightward direction, "L" indicates the leftward direction, "U" indicates the upward direction, and "Lo" indicates the downward direction.

[0021] 1 to 4, motor unit 10 is an integrated mechanical and electrical unit including motor 12, a reducer 14, and an inverter 16. Reducer 14 is provided to the side (left side in this embodiment) of motor 12, and inverter 16 is provided behind motor 12 and reducer 14.

[0022] 5, the motor 12 includes a case 18. The case 18 has a three-layer structure and includes a stator housing 20, a first motor cover 22 provided at the output side end of the stator housing 20, and a second motor cover 24 provided at the anti-output side end of the stator housing 20. The second motor cover 24 includes a cover body 26 and a pipe holding portion 28 attached to the cover body 26, and a branch member 30 is provided between the cover body 26 and the pipe holding portion 28.

[0023] A first external pipe 32 is provided on the outside of the stator housing 20 and is held by the first motor cover 22 and the second motor cover 24. The first external pipe 32 is a separate member from the stator housing 20, is provided slightly away from the stator housing 20, and is sandwiched between the first motor cover 22 and the second motor cover 24. The outlet side end of the first external pipe 32 is held by the pipe holding portion 28, and the branch portion Material 30. Inside the first external pipe 32, an outward oil passage 34 that communicates between the first motor cover 22 and the second motor cover 24 is formed. In addition, a second external pipe 36 that is held by the first motor cover 22 and the second motor cover 24 is provided below the first external pipe 32 on the outside of the stator housing 20. The second external pipe 36 is a separate member from the stator housing 20, is provided slightly away from the stator housing 20, and is sandwiched between the first motor cover 22 and the second motor cover 24. The inlet side end of the second external pipe 36 is held by the pipe holding portion 28. Inside the second external pipe 36, a return oil passage 38 that communicates between the first motor cover 22 and the second motor cover 24 is formed. The return oil passage 38 is provided below the outward oil passage 34. Preferably, the cross-sectional area of ​​the outward oil passage is set smaller than the cross-sectional area of ​​the return oil passage . That is, preferably, the inner diameter of the first external pipe 32 is set smaller than the inner diameter of the second external pipe .

[0024] A rotor 40 is provided within the case 18. The rotor 40 is rotatably held by the first motor cover 22 and the second motor cover 24 via motor bearings 42, 44. The rotor 40 includes a rotor shaft 46 and a rotor core 48. The rotor shaft 46 has a hollow portion 50 extending in the axial direction. The rotor core 48 has a plurality of rotor core holes 52 and a plurality of magnets 54. End plates 56, 58 are disposed at both axial ends of the rotor core 48.

[0025] A stator 60 is provided radially outside the rotor 40 within the case 18. The stator 60 includes a stator core 62 provided radially outside the rotor 40 and fixed to the stator housing 20, and a stator coil 64 wound around the stator core 62. The stator core 62 is fixed to the stator housing 20 by shrink fitting. Coil end covers 66, 68 are provided to cover both axial ends of the stator coil 64, i.e., the coil ends.

[0026] A resolver 70 for detecting the rotation angle of the rotor shaft 46 is provided between the second motor cover 24 and the rotor shaft 46. The resolver 70 includes a resolver stator 72 attached to the second motor cover 24 and a resolver rotor 74 attached to the rotor shaft 46. The resolver rotor 74 is fixed to the rear end of the rotor shaft 46 by a bolt 76 having a generally hat-shaped cross section.

[0027] 1, the stator housing 20 and the first motor cover 22 are connected by a plurality of bolts 78. Each bolt 78 is screwed into a boss 80 provided at the output side end on the outer circumferential surface of the stator housing 20 and a boss 82 provided on the outer circumferential portion of the first motor cover 22. The stator housing 20 and the second motor cover 24 are connected by a plurality of bolts 84. Each bolt 84 is screwed into a boss 86 provided at the non-output side end on the outer circumferential surface of the stator housing 20 and a boss 88 provided on the outer circumferential portion of the second motor cover 24.

[0028] Referring to Fig. 5, a cover 90 is provided on the side of the second motor cover 24. A gasket 92 is interposed between the second motor cover 24 and the cover 90. Referring to Fig. 6, the gasket 92 is formed in a substantially annular shape and has through holes 94, 96 for communicating oil passages. A pipe 98 extending into the hollow portion 50 of the rotor shaft 46 is attached to the center of the cover 90.

[0029] An oil filter 100 for purifying oil to be supplied into the case 18 is provided on the outer surface of the first motor cover 22. Oil is supplied to the oil filter 100 from an oil cooler 158 (described later) provided outside the motor unit 10. The oil filter 100 has a substantially cylindrical outer shape, and has an oil outlet 100a at the center of the end on the first motor cover 22 side. The oil filter 100 and the first motor cover 22 are connected by a union bolt 102. The union bolt 102 is attached to the inlet end of an oil passage 134 (described later) of the first motor cover 22, and is inserted into the oil outlet 100a of the oil filter 100.

[0030] 3, at least a part of the lower half of the oil filter 100 overlaps with the upper half of the stator core 62 as viewed in the axial direction of the rotor shaft 46. The oil filter 100 is located above the rotor shaft 46 and the output shaft 114 (described later). The center C of the oil filter 100 is located above the outer circumferential surface of the stator coil 64. At least a part of the oil filter 100 overlaps with the first external pipe 32 as viewed in the axial direction of the rotor shaft 46. Preferably, when a cylindrical filter is used as the oil filter 100, the oil discharge port 100a is located at the center of the oil filter 100, and the center of the oil filter 100 is located above the output shaft 114 and above the rotor shaft 46. In this case, the arrangement of the oil filter 100 becomes compact and the oil passage can be appropriately designed.

[0031] The reducer 14 is provided on the side (left side in this embodiment) of the first motor cover 22 to reduce the rotation of the rotor. The reducer 14 includes a gear cover 104 provided on the side of the first motor cover 22. With reference to Figs. 3 and 5, an input gear 106, an intermediate shaft 108, intermediate gears 110 and 112, an output shaft 114, and an output gear 116 are provided in the gear cover 104. The intermediate shaft 108 and the output shaft 114 are provided in parallel with the rotor shaft 46. The input gear 106 is attached to the tip of the rotor shaft 46 and is rotatably supported by the first motor cover 22 and the gear cover 104 via input gear bearings 118 and 120. The intermediate shaft 108 is rotatably supported by the first motor cover 22 and the gear cover 104 via intermediate gear bearings 122 and 124. The intermediate gears 110 and 112 are both attached to the intermediate shaft 108, the intermediate gear 110 meshing with the input gear 106, and the intermediate gear 112 meshing with the output gear 116. The output shaft 114 is rotatably supported by the first motor cover 22 and the gear cover 104 via a bearing (not shown). The output gear 116 is attached to the output shaft 114. If a line segment connecting the center of the rotor shaft 46 and the center of the output shaft 114 is defined as a reference line B, a perpendicular line perpendicular to the reference line B and passing through the center of the rotor shaft 46 is defined as a first perpendicular line V1, and a perpendicular line perpendicular to the reference line B and passing through the center of the output shaft 114 is defined as a second perpendicular line V2, at least a portion of the oil filter 100 overlaps with a region surrounded by the reference line B, the first perpendicular line V1, and the second perpendicular line V2 when viewed from the axial direction of the rotor shaft 46. By covering the outer surface of the first motor cover 22 with the gear cover 104, an oil reservoir 126 that communicates with the return oil passage 38 is formed. In other words, the oil reservoir 126 is formed inside the reducer 14. An oil strainer 126a is provided in the oil reservoir 126, and the oil from the case 18 and the oil from the gear cover 104 are stored in the oil reservoir 126.

[0032] The gear cover 104 is provided with two oil level gauges 128 for detecting the amount of oil in the oil reservoir 126. The gear cover 104 is also provided with two oil pumps 130 for supplying the oil in the oil reservoir 126 to an external oil cooler 158. That is, the two oil pumps 130 are provided on the outer surface of the reducer 14 for discharging the oil to the outside.

[0033] The inverter 16 is connected to a battery (not shown) via a connection terminal 132 , converts direct current from the battery into alternating current, and supplies the alternating current to the motor 12 .

[0034] In such a motor unit 10, oil passages are formed as follows.

[0035] 5 and 7, the first motor cover 22 has an oil passage 134 that communicates with the outward oil passage 34 to supply oil from the oil filter 100 to the outward oil passage 34, and oil passages 136, 138, and 140 that branch off from the oil passage 134. The oil passage 134 communicates the oil outlet 100a of the oil filter 100 with the outward oil passage 34 of the first external pipe 32. The oil passage 136 communicates with an oil passage 142 in the reducer 14, and oil is supplied to the input gear bearing 120. The oil from the oil passage 138 is supplied to the motor bearing 42 and the input gear bearing 118, and the oil from the oil passage 140 is supplied to the coil end of the stator coil 64. In this way, the oil is supplied into the case 18 via the oil passages 138 and 140. The oil from the oil passage 134 is supplied to the second motor cover 24 through the outward oil passage 34.

[0036] The second motor cover 24 has oil passages 144, 146, and 148. The oil supplied to the second motor cover 24 through the forward oil passage 34 is branched by the branching member 30, supplied to the coil end of the stator coil 64 through the oil passage 144, and supplied toward the cover 90 through the oil passage 146. The cover 90 has an oil passage 150. The oil passage 150 can communicate with the oil passages 146 and 148. That is, the oil passage 146 and the oil passage 150 communicate with each other through the through hole 94 of the gasket 92, and the oil passage 150 and the oil passage 148 communicate with each other through the through hole 96 of the gasket 92. Therefore, the oil passages 146 and 148 of the second motor cover 24 communicate with each other through the oil passage 150 of the cover 90, and the oil from the oil passage 146 is supplied to the motor bearing 44 and its vicinity through the oil passages 150 and 148. Furthermore, oil passage 150 is connected to oil passage 152 which passes through pipe 98, hollow portion 50 of rotor shaft 46, and rotor core hole 52 to the coil end of stator coil 64. Thus, oil from oil passage 150 is supplied to the coil end of stator coil 64 through oil passage 152. In this manner, oil from outward oil passage 34 is supplied into case 18 through second motor cover 24 and cover 90.

[0037] The oil supplied to the coil ends of the stator coil 64 is supplied to the oil sump 126 via the oil passage 154 and the return oil passage 38 or via the oil passage 156 of the first motor cover 22. The oil in the oil sump 126 is sucked up by the two oil pumps 130 through the oil strainer 126a and supplied to the oil cooler 158. The oil is cooled by the oil cooler 158 and then returned to the oil filter 100.

[0038] In this embodiment, the first external pipe 32 corresponds to the external pipe.

[0039] According to this motor unit 10, the oil filter 100 is provided on the outer surface of the first motor cover 22 so that at least a portion of the lower half of the oil filter 100 overlaps with the upper half of the stator core 62 when viewed in the axial direction of the rotor shaft 46. This allows the oil filter 100 to be provided on the first motor cover 22 at a position shifted upward from the center of the stator core 62, that is, by utilizing free space that does not interfere with other components. This allows the motor unit 10 to be configured compactly.

[0040] Since the oil pump 130 for discharging the oil in the oil reservoir 126 of the reducer 14 to the outside is provided on the outer surface of the reducer 14, the motor unit 10 including the oil pump 130 can be configured compactly.

[0041] When viewed in the axial direction of the rotor shaft 46, the area surrounded by the reference line B, the first perpendicular line V1, and the second perpendicular line V2 tends to be empty space. Therefore, by providing the oil filter 100 so that at least a portion of the oil filter 100 overlaps with this area, the empty space can be effectively utilized without interfering with other components, and the motor unit 10 can be configured compactly.

[0042] Since the oil filter 100 is positioned above the output shaft 114, it does not interfere with the output from the output shaft 114 of the reducer 14, and the motor unit 10 can be configured compactly.

[0043] Since the oil filter 100 is positioned above the rotor shaft 46, it does not interfere with the output from the rotor shaft 46 of the rotor 40, and the motor unit 10 can be configured compactly.

[0044] Since the center C of the oil filter 100 is located above the outer circumferential surface of the stator coil 64 , the oil can easily drip through the oil filter 100 onto the stator coil 62 inside the case 18 .

[0045] The outside of the stator housing 20 where the first external pipe 32 is provided and its vicinity tend to be empty spaces. Therefore, by providing the oil filter 100 so that at least a portion of the oil filter 100 overlaps with the first external pipe 32 when viewed in the axial direction of the rotor shaft 46, the empty space can be effectively utilized without interfering with other components, and the motor unit 10 can be configured compactly.

[0046] Oil can be smoothly supplied from the oil outlet 100 a provided at the end of the oil filter 100 on the first motor cover 22 side through the oil passage 134 of the first motor cover 22 to the outgoing oil passage 34 of the first external pipe 32 .

[0047] Although the preferred embodiment of the present invention has been described above, it will be apparent that various modifications can be made without departing from the scope and spirit of the present invention, which is limited only by the appended claims. [Explanation of symbols]

[0048] 10 Motor unit 12 Motor 14 Reducer 16 Inverter 18 cases 20 Stator housing 22 First motor cover 24 Second motor cover 32 First external pipe 34 Outbound oilway 36 Second external pipe 38 Return oil road 40 Rotor 46 Rotor shaft 48 Rotor core 60 Stator 62 Stator core 64 Stator coil 90 Cover 92 Gasket 100 Oil Filter 100a Oil outlet 108 Intermediate shaft 114 Output shaft 126 Oil Puddle 130 Oil pump 134,136,138,140,142,144,146,148,150,152,154,156 Oil road B Reference line C Center of oil filter V1 First perpendicular line V2 Second perpendicular line

Claims

1. a case including a stator housing, a first motor cover provided at an output side end of the stator housing, and a second motor cover provided at an opposite output side end of the stator housing; a rotor having a rotor shaft and disposed within the case; a stator provided in the case, the stator having a stator core provided radially outside the rotor and a stator coil provided in the stator core; an oil filter provided on an outer surface of the first motor cover to purify the oil to be supplied into the case; a reducer provided on a side of the first motor cover to reduce the rotation speed of the rotor, A motor unit, wherein at least a portion of a lower half of the oil filter overlaps with an upper half of the stator core when viewed in the axial direction of the rotor shaft.

2. The reducer has an oil reservoir in which oil from the case is accommodated, The motor unit according to claim 1 , further comprising an oil pump provided on an outer surface of the reducer for discharging oil in the oil reservoir to the outside.

3. The reducer further includes an output shaft provided parallel to the rotor shaft, If a line segment connecting the center of the rotor shaft and the center of the output shaft is defined as a reference line, a perpendicular line perpendicular to the reference line and passing through the center of the rotor shaft is defined as a first perpendicular line, and a perpendicular line perpendicular to the reference line and passing through the center of the output shaft is defined as a second perpendicular line, The motor unit according to claim 2 , wherein at least a portion of the oil filter overlaps a region surrounded by the reference line, the first perpendicular line, and the second perpendicular line when viewed in the axial direction of the rotor shaft.

4. The motor unit according to claim 3 , wherein the oil filter is located above the output shaft.

5. 5. The motor unit according to claim 1, wherein the oil filter is located above the rotor shaft.

6. 6. The motor unit according to claim 1, wherein a center of the oil filter is located above an outer circumferential surface of the stator coil.

7. an external pipe having an outgoing oil passage for supplying the oil that has passed through the oil filter into the case, the external pipe being provided outside the stator housing and held by the first motor cover and the second motor cover; 7. The motor unit according to claim 1, wherein at least a portion of the oil filter overlaps with the external pipe when viewed in the axial direction of the rotor shaft.

8. The oil filter has an oil discharge port at an end portion on the first motor cover side, The motor unit according to claim 7 , wherein the first motor cover has an oil passage for communicating the oil discharge port with the outgoing oil passage of the external pipe.

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