Rotating electric machine unit

Abstract

To increase the cooling efficiency of a coil end part as much as possible while suppressing the deterioration of the layout of a rotary electric machine unit.SOLUTION: A rotary electric machine includes a rotary electric machine body having a rotary shaft and a coil wound around a stator located on the outer radial direction of the rotary shaft, a housing accommodating the rotary electric machine body, a lead wire passing between the rotary electric machine body and the housing in a radial direction of the rotary shaft, connected to the coil end part of the coil from the outside in the radial direction, and electrically connecting the rotary electric machine body to a power converter, and an oil supply part supplying oil to the coil end part of the coil. The oil supply part supplies oil to the upper portion of the coil end part from the side in the shaft direction.SELECTED DRAWING: Figure 10

Description

Technical Field

[0001] The technology disclosed herein belongs to the technical field related to rotating electrical machine units.

Background Art

[0002] In recent years, in almost all electromechanical devices, rotating electrical machines such as motors that rotate by electricity and generators that generate electricity by rotation are used. It is necessary to maintain the coil at an appropriate temperature. For this reason, a structure for supplying a refrigerant to the coil has been proposed.

[0003] For example, in Patent Document 1, as a cooling structure for the coil end portion, three oil discharge holes are provided along the outer peripheral direction of the coil end portion above the coil end portion, and oil is dripped from the oil discharge holes to the coil end portion. A configuration is disclosed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] The technology disclosed herein was developed in view of these points, and its purpose is to maximize the cooling efficiency of the coil end while suppressing deterioration of the layout of the rotating electric machine unit. [Means for solving the problem]

[0008] To solve the aforementioned problems, the technology disclosed herein provides a rotating electric machine unit comprising: a rotating electric machine body having a rotating shaft extending horizontally, a rotor fixed to the rotating shaft, a stator located radially outward from the rotating shaft than the rotor, and a coil wound around the stator; a housing for housing the rotating electric machine body; lead wires connected from the radially outward side to the coil end portion of the coil, passing between the rotating electric machine body and the housing in the radial direction of the rotating shaft, and electrically connecting the rotating electric machine body and a power converter; and an oil supply unit for supplying oil to the coil end portion, wherein the oil supply unit has an upper portion of the coil end portion, The aforementioned rotating shaft extendsThe device is configured to supply oil from the axial side, and the oil supply section is formed by the coil end portion, the wall surface of the housing facing the axial direction, and a plate member attached to the wall surface, and has a lateral oil passage located to the side of the coil end portion in the axial direction, an oil supply hole provided in the plate member for supplying oil from the lateral oil passage to the coil end portion, and a main passage formed above the plate member so as to extend in the axial direction within the wall portion of the housing, the lateral oil passage is formed in at least one of the wall surface of the housing and the plate member and is formed by a recess that is recessed in the axial direction, the recess and the plate member form an annular shape formed along the circumferential direction of the coil end portion, a plurality of oil supply holes are provided at intervals in the circumferential direction of the plate member, the main passage communicates with the upper part of the lateral oil passage, and the plurality of oil supply holes are provided in greater numbers in the lower portion than in the upper portion of the plate member.

[0009] This configuration allows for oil to be supplied to the coil end from the side, improving the flexibility of the lead wire routing structure when the lead wire is connected to the coil end from the radially outer side. Furthermore, since oil is supplied to the upper part of the coil end, the lower part of the coil end is supplied by the oil moving downward due to gravity. Therefore, it is possible to maximize the cooling efficiency of the coil end while suppressing deterioration of the layout of the rotating electric machine unit.

[0010] Also, A configuration for supplying oil to the coil end from the side can be easily formed. In particular, since the oil supplied to the side oil passage is released from the oil supply hole of the plate member, it is easy to apply pressure to the oil, and oil can be properly supplied to the coil end even from the side. This makes it possible to further improve the cooling efficiency of the coil end.

[0011] Furthermore, oil can be supplied to the entire circumferential direction of the coil end. This allows for a higher cooling efficiency of the coil end.

[0012] Furthermore, the oil pressure is lower in the lower portion of the lateral oil passage compared to the upper portion of the lateral oil passage. Therefore, by forming more oil supply holes in the lower portion of the plate member than in the upper portion, the difference in oil supply volume between the upper and lower portions of the coil end can be reduced. This allows for further improvement of the cooling efficiency of the coil end.

[0013] In the above embodiment, the recess may be formed in the wall portion of the housing, and the plate member may be in the shape of a flat plate covering the recess.

[0014] This configuration allows for easy formation of lateral oil passages and minimizes axial expansion of the rotating electric machine unit.

[0015] In a rotating electric machine unit in which the recess forms an annular shape, the oil supply unit is ,before The uppermost part of the lateral oil passage is connected to the main passage. distribution aisle to It would also be acceptable to have a configuration where it is possessed by [something].

[0016] This configuration allows the oil supply path from the main passage to the lateral oil passages to be as short as possible. Furthermore, the connection between the top of the lateral oil passages and the main passage facilitates the distribution of oil throughout the entire lateral oil passage. This makes it easier to apply hydraulic pressure to the entire lateral oil passage, ensuring that oil is properly supplied to the coil end from each oil supply port. As a result, the cooling efficiency of the coil end can be significantly improved.

[0017] In a rotating electric machine unit in which the main passage and the uppermost part of the lateral oil passage are in communication, the plurality of oil supply holes may be configured to be arranged symmetrically with respect to a straight line passing through the uppermost part of the lateral oil passage and the center of the rotation axis when viewed from the axial direction.

[0018] That is, if the oil supply holes are formed asymmetrically, a difference in hydraulic pressure is likely to occur between the clockwise side and the counterclockwise side with respect to the uppermost part of the side oil passage, and the oil supply amount is likely to vary. In the above-described configuration, a difference in hydraulic pressure is less likely to occur between the clockwise side and the counterclockwise side with respect to the uppermost part of the side oil passage. As a result, the variation in the oil supply amount is less likely to occur, and the cooling efficiency of the coil end portion can be further improved.

[0019] In the aforementioned rotating electric machine unit, The coil end portion may be configured such that it is laminated in multiple layers in the radial direction, and the oil supply portion is configured to supply oil to the outermost portion in the radial direction of the coil end portion.

[0020] According to this configuration, oil can be efficiently distributed throughout the entire coil end portion. Thereby, the cooling efficiency of the coil end portion can be further improved.

Advantages of the Invention

[0021] As described above, according to the technology disclosed herein, by supplying oil from the side of the coil end portion, it is possible to suppress the deterioration of the layout property of the rotating electrical machine unit and to make the cooling efficiency of the coil end portion as high as possible.

Brief Description of the Drawings

[0022] [Figure 1] FIG. 1 is a schematic diagram showing a drive system of a vehicle in which a rotating electrical machine according to an exemplary embodiment is disposed. [Figure 2] FIG. 2 is a plan view of the front part of the vehicle as viewed from above. [Figure 3] FIG. 3 is a front view of the power unit. [Figure 4] FIG. 4 is a view of the speed reducer as viewed from the generator side. [Figure 5] FIG. 5 is a cross-sectional view of the power unit cut along a plane along the rotational axis direction of the motor. [Figure 6]Figure 6 is an enlarged view of section VI of Figure 5. [Figure 7] Figure 7 is a perspective view of the second housing, seen from the upper right and rear. [Figure 8] Figure 8 shows the end cover as viewed from the drive motor side, with the plate member omitted. [Figure 9] Figure 9 shows the end cover as viewed from the drive motor side, with the plate member attached. [Figure 10] Figure 10 is a perspective view of the dashed line portion of Figure 5, taken from an oblique direction. [Modes for carrying out the invention]

[0023] The following describes exemplary embodiments in detail with reference to the drawings. In the following description, the front, rear, left, right, top, and bottom of the vehicle will be simply referred to as front, rear, left, right, top, and bottom, respectively. In the left-right direction, when viewed from the rear to the front, the left side is referred to as left, and the right side as right. The left-right direction is also the vehicle width direction. Furthermore, in the following description, "○○ for power generation" means that it is mainly used for operating the generator 13, and is not limited to being used only for power generation.

[0024] (Overall configuration of the vehicle's drive system) Figure 1 is a block diagram of a vehicle drive system. Figure 1 only schematically shows the elements that make up the drive system P mounted on vehicle 1. The positions of the elements in Figure 1 do not necessarily limit the actual positions of the elements.

[0025] Vehicle 1 is a series hybrid vehicle. Vehicle 1 is equipped with a drive system P consisting of an electric drive unit 10 for using electricity to propel Vehicle 1 and an engine E for generating electricity.

[0026] The electric drive unit 10 includes a drive motor 11, a reduction gear 12, and a generator 13. The drive motor 11 is driven by a power supply. The reduction gear 12 reduces the output of the drive motor 11. The generator 13 generates electricity to supply to the drive motor 11.

[0027] Engine E is connected to generator 13. Engine E drives generator 13 to generate electricity. Power to move vehicle 1 is generated by drive motor 11. The power generated by drive motor 11 is shifted by reduction gear 12 and then transmitted to drive wheels 42 (front wheels in this case) via differential device 41.

[0028] Vehicle 1 is equipped with a high-voltage battery B1 and a low-voltage battery B2. The high-voltage battery B1 is charged by electricity generated by the generator 13. A power generator inverter 22 is provided between the generator 13 and the high-voltage battery B1. The power generator inverter 22 is electrically connected to the generator 13 and the high-voltage battery B1. The electricity generated from the generator 13 is supplied to the high-voltage battery B1 via the power generator inverter 22. A motor inverter 21 is provided between the drive motor 11 and the high-voltage battery B1. The motor inverter 21 is electrically connected to the drive motor 11 and the high-voltage battery B1. The motor inverter 21 converts the electricity from the high-voltage battery B1 into power to drive the drive motor 11 and outputs it to the drive motor 11. A DC-DC converter 23 is provided between the high-voltage battery B1 and the low-voltage battery B2. The DC-DC converter 23 is electrically connected to the high-voltage battery B1 and the low-voltage battery B2. The electricity from the high-voltage battery B1 is supplied to the low-voltage battery B2 via the DC-DC converter 23. The electricity generated from the generator 13 is supplied to the low-voltage battery B2 via the power generation inverter 22 and the DC-DC converter 23. The motor inverter 21, the power generation inverter 22, and the DC-DC converter 23 constitute the control unit 20 that controls the electric drive unit 10.

[0029] (Mounting structure of the drive unit on a vehicle) As shown in Figure 2, the drive unit P is located in a power unit room 2 formed at the front of the vehicle 1. More specifically, the vehicle 1 has a pair of left and right front side frames 31 extending in the front-rear direction, and the power unit room 2 for housing the drive unit P is formed between these left and right front side frames 31. The drive unit P is supported by the left and right front side frames 31 via support members 32.

[0030] As shown in Figure 3, the electric drive unit 10 and the control unit 20 are arranged side by side in the vertical direction. Specifically, the control unit 20 is located above the electric drive unit 10.

[0031] As shown in Figures 4 and 5, the drive motor 11, the reduction gear 12, and the generator 13 are housed within the housing 100. The housing 100 is constructed by integrating multiple components. The housing 100 includes a first housing 110, a second housing 120, a right end cover 130, and a left end cover 140.

[0032] The first housing 110 and the second housing 120 each have a cylindrical shape with openings at both the left and right ends. The left end cover 140 and the right end cover 130 each have a lid shape with either the right or left end closed. The second housing 120 is positioned to the left of the first housing 110, and the left end cover 140 is positioned to the left of the second housing 120. The right end cover 130 is positioned to the right of the first housing 110. The right end cover 130, the first housing 110, the second housing 120, and the left end cover 140 are arranged in this order from right to left. The flanges at the left and right ends of the first housing 110, the second housing 120, the right end cover 130, and the left end cover 140 are connected by bolts.

[0033] The first housing 110, the second housing 120, the left end cover 140, and the right end cover 130 are each made of, for example, an aluminum alloy and formed by casting.

[0034] Engine E is located to the left of the left end cover 140. In other words, engine E is located to the left of the electric drive unit 10.

[0035] As shown in Figure 5, the first housing 110 has a first partition wall 111 for dividing the housing 100 into multiple rooms. The first partition wall 111 extends in a direction that intersects the left-right direction at the midpoint of the first housing 110 in the left-right direction. More specifically, the first partition wall 111 extends in the vertical and front-back directions perpendicular to the left-right direction (see also Figure 4). The second housing 120 has a second partition wall 121. The second partition wall 121 also extends in a direction that intersects the left-right direction at the midpoint of the second housing 120 in the left-right direction, and more specifically, in the vertical and front-back directions perpendicular to the left-right direction.

[0036] The drive motor 11 is housed in the first chamber 101, which is separated by the right end cover 130 and the first partition wall 111 of the first housing 110. The generator 13 is housed in the third chamber 103, which is separated by the second partition wall 121 of the second housing 120 and the left end cover 140. The reduction gear 12 is housed in the second chamber 102, which is separated by the first partition wall 111 and the second partition wall 121.

[0037] (Each element of the electric drive unit) <Drive motor> The drive motor 11 includes a motor shaft 11c extending in the left-right direction, a motor rotor 11a fixed to the motor shaft 11c, and a motor stator 11b arranged around the motor rotor 11a. When a three-phase alternating current is supplied to the motor stator 11b, a rotating magnetic field is generated, causing the motor rotor 11a and the motor shaft 11c to rotate.

[0038] The motor rotor 11a is located in the first chamber 101. The motor rotor 11a has magnets and magnetic materials. The motor rotor 11a and the motor shaft 11c rotate together as a single unit.

[0039] The motor shaft 11c extends in the left-right direction. The first bearing 11d rotatably supports the right end of the motor shaft 11c. The right end cover 130 holds the first bearing 11d. The left end of the motor shaft 11c extends through the first partition wall 111 of the first housing 110 to the second chamber 102. The second bearing 11e rotatably supports the left end of the motor shaft 11c. The first boss portion 122, integrally formed with the second partition wall 121, holds the second bearing 11e. The first boss portion 122 protrudes to the left from the second partition wall 121.

[0040] The motor stator 11b is held in place by the first housing 110 and the right end cover 130. A motor coil 11g is wound around the motor stator 11b.

[0041] The left motor coil end portion 11gL and the right motor coil end portion 11gR, which are the left and right ends of the motor coil 11g, are located outside the motor rotor 11a in the axial direction of the motor shaft 11c. The left and right motor coil end portions 11gL and 11gR form a layered structure in the radial direction. The motor coil end portions 11gL and 11gR are electrically connected to the motor inverter 21 via motor lead wires 11h. The motor lead wires 11h are connected to the right motor coil end portion 11gR from the radially outside. The motor lead wires 11h extend to the right of the left motor coil end portion 11gL and outside the first housing 110 (see Figure 7). Therefore, within the first housing 110, there are no motor lead wires 11h around the left motor coil end portion 11gL.

[0042] <generator> The generator 13 comprises a generator shaft 13c extending in the left-right direction, a power generation rotor 13a fixed to the generator shaft 13c, and a power generation stator 13b arranged around the power generation rotor 13a. When the generator shaft 13c and the power generation rotor 13a rotate due to the power of the engine E, electricity is generated in the power generation stator 13b by electromagnetic induction.

[0043] The generator rotor 13a is located in the third chamber 103. The generator rotor 13a has magnets and magnetic materials. The generator rotor 13a and the generator shaft 13c rotate together as a single unit.

[0044] The generator shaft 13c extends in the vehicle width direction. The generator shaft 13c and the motor shaft 11c are located coaxially. The third bearing 13d rotatably supports the left end of the generator shaft 13c. The second boss portion 123, which is integrally formed with the second partition wall 121, holds the third bearing 13d. The second boss portion 123 protrudes to the right from the second partition wall 121. The generator shaft 13c abuts against the motor shaft 11c at the second partition wall 121.

[0045] The left end of the generator shaft 13c extends through the left end cover 140. The generator shaft 13c is connected to the output shaft of engine E. The fourth bearing 13e rotatably supports the left end of the generator shaft 13c. The left end cover 140 holds the fourth bearing 13e.

[0046] The generator stator 13b is held in the second housing 120. A generator coil 13g is wound around the generator stator 13b.

[0047] The left and right ends of the power generation coil 13g, namely the left power generation coil end portion 13gL and the right power generation coil end portion 13gR, are located outside the power generation rotor 13a in the axial direction of the generator shaft 13c. The left and right power generation coil end portions 13gL and 13gR form a layered structure in the radial direction. The power generation coil end portions 13gL and 13gR are electrically connected to the power generation inverter 22 via power generation lead wires 13h. The power generation lead wires 13h are connected to the left power generation coil end portion 13gL from the radially outer side. The power generation lead wires 13h extend to the outside of the second housing 120 to the left of the right power generation coil end portion 13gR. Therefore, within the second housing 120, the power generation lead wires 13h do not exist around the right power generation coil end portion 13gR.

[0048] The outer diameter of the drive motor 11 and the outer diameter of the generator 13 are the same. More specifically, the outer diameter of the motor rotor 11a of the drive motor 11 and the outer diameter of the power generation rotor 13a of the generator 13 are the same, and the outer diameter of the motor stator 11b of the drive motor 11 and the outer diameter of the power generation stator 13b of the generator 13 are the same. The first housing 110 and the second housing 120 have similar external shapes so that the drive motor 11 and the generator 13, which have the same outer diameter, can be housed in each other (see Figure 4).

[0049] Furthermore, the motor shaft 11c and the generator shaft 13c are coaxial, and the motor rotor 11a and the generator rotor 13a rotate around the same axis.

[0050] <Reduction gear> As mentioned above, the reduction gear 12 is located between the drive motor 11 and the generator 13. The reduction gear 12 is located to the left of the drive motor 11 in the left-right direction. The reduction gear 12 is also located behind the motor shaft 11c in the front-rear direction.

[0051] The gear reducer 12 is a parallel-shaft gear reducer. As shown in Figure 4, the gear reducer 12 has a first gear 12a, a second gear 12b, and a third gear 12c. The first gear 12a meshes with an output gear 11f fixed to the motor shaft 11c. The output gear 11f is located between the first partition wall 111 and the second bearing 11e. The first gear 12a has a larger diameter than the output gear 11f.

[0052] The first gear 12a rotates integrally with the first shaft 12d. The first shaft 12d is parallel to the motor shaft 11c. More specifically, the first shaft 12d extends laterally at a position behind the motor shaft 11c. The housing 100 rotatably supports the first shaft 12d.

[0053] The second gear 12b rotates integrally with the first shaft 12d and the first gear 12a. The second gear 12b has a smaller diameter than the first gear 12a.

[0054] The third gear 12c meshes with the second gear 12b. The third gear 12c has a larger diameter than the second gear 12b. The third gear 12c rotates integrally with the second shaft 12e. The second shaft 12e is parallel to the motor shaft 11c and the first shaft 12d. More specifically, the second shaft 12e extends laterally behind and below the first shaft 12d. The housing 100 rotatably supports the second shaft 12e.

[0055] The second shaft 12e is connected to the drive shaft 43 via the differential device 41. As shown in Figure 2, the drive shaft 43 extends left and right at the rear of the housing 100. The reduction gear 12 reduces the output of the drive motor 11 by a predetermined reduction ratio and outputs it to the differential device 41.

[0056] (Oil supply system) The drive unit P includes a supply system 5 that supplies lubricating and / or cooling oil to the drive motor 11, the reduction gear 12, and the generator 13, respectively. The supply system 5 includes an oil pump 51, an oil cooler 52, an oil passage 6, and an oil pipe 7. The oil pipe 7 is divided into a first oil pipe 71 and a second oil pipe 72.

[0057] An oil reservoir 105 is formed at the bottom of the second chamber 102 inside the housing 100. As will be described later, the oil supplied to the drive motor 11, the reduction gear 12, and the generator 13 each falls downward due to gravity. The oil that falls downward flows from side to side towards the center of the housing 100 and collects at the bottom of the second chamber 102. The oil circulates within the housing 100.

[0058] A strainer 53 is installed in the oil reservoir 105. The strainer 53 separates oil from foreign matter. An oil temperature sensor 54 is also installed in the oil reservoir 105. The oil temperature sensor 54 measures the temperature of the oil accumulated in the oil reservoir 105.

[0059] The oil pump 51 is mounted on the outside of the housing 100. The oil pump 51 is mounted on the bottom of the housing 100. The oil pump 51 draws oil from the oil reservoir 105 through the strainer 53 and discharges it from the outlet. The oil pump 51 is electrically operated.

[0060] A first oil pipe 71 is connected to the discharge port of the oil pump 51. The first oil pipe 71 is located inside the second chamber 102. The first oil pipe 71 connects the oil pump 51 to the oil cooler 52.

[0061] The oil cooler 52 is a water-cooled heat exchanger that performs heat exchange between cooling water and oil. In addition to cooling the oil, the cooling water also cools the electric drive unit 10 and the control unit 20 of the drive unit P. The oil cooler 52 has a cooling water inlet 521 and an outlet 522.

[0062] The oil cooler 52 is located downstream of the oil pump 51 in the oil supply system 5. The oil cooler 52 is located at the front of the lower part of the housing 100. The oil pump 51 and the oil cooler 52 are located at approximately the same height in the vertical direction. As shown in Figure 4, this position corresponds to the position below the drive motor 11. The oil cooler 52 is positioned so as not to protrude forward beyond the front end of the housing 100. This arrangement is advantageous in enhancing the collision safety of the vehicle 1.

[0063] A first through-hole 112 and a second through-hole 113 are formed within the first partition wall 111 of the first housing 110 (see Figure 4). The first through-hole 112 and the second through-hole 113 each extend substantially radially, connecting the inside and outside of the housing 100. These first through-hole 112 and the second through-hole 113 are, for example, casting holes formed during casting. The oil inlet of the oil cooler 52 is connected to the first through-hole 112, and the oil outlet is connected to the second through-hole 113.

[0064] The first oil pipe 71 is connected to the first through-hole 112. The second oil pipe 72 is connected to the second through-hole 113. The second oil pipe 72 connects the oil cooler 52 to the oil passage 6.

[0065] The oil passage 6 consists of a main passage 60, a plurality of distribution passages 61-67, and a supply passage 68. These passages 60-68 are, for example, cast holes formed during casting.

[0066] The main passage 60 is located at the upper end of the housing 100. The main passage 60 extends in the left-right direction along the axial direction of the motor shaft 11c and the generator shaft 13c. The main passage 60 spans the right end cover 130, the first housing 110, the second housing 120, and the left end cover 140.

[0067] Distribution passages 61 to 67 branch off from the main passage 60. The first distribution passage 61 is formed at the right end of the right end cover 130. The first distribution passage 61 mainly supplies oil to the right motor coil end portion 11gR of the drive motor 11 and the first bearing 11d.

[0068] The second distribution passage 62 is formed midway between the left and right sides of the right end cover 130. The second distribution passage 62 mainly supplies oil to the motor stator 11b of the drive motor 11.

[0069] The third distribution passage 63 is formed to the right of the first partition wall 111 of the first housing 110. The third distribution passage 63 mainly supplies oil to the left motor coil end portion 11gL of the drive motor 11.

[0070] The fourth distribution passage 64 is formed within the second partition wall 121 of the second housing 10. The fourth distribution passage 64 extends downward from the main passage 60 to the vicinity of the motor shaft 11c and the generator shaft 13c. The fourth distribution passage 64 supplies oil to the motor rotor 11a, second bearing 11e, third bearing 13d of the drive motor 11, and the power generation rotor 13a of the generator 13 through the motor shaft 11c and the generator shaft 13c.

[0071] The fifth distribution passage 65 is formed to the left of the second partition wall 121 of the second housing 10. The fifth distribution passage 65 mainly supplies oil to the right power generation coil end portion 13gR of the generator 13.

[0072] The sixth distribution passage 66 is formed in the middle of the left and right sides of the second housing 10. The sixth distribution passage 66 mainly supplies oil to the generator stator 13b of the generator 13.

[0073] The seventh distribution passage 67 is formed in the left end cover 140. The seventh distribution passage 67 mainly supplies oil to the left power generation coil end portion 13gL of the generator 13.

[0074] The supply passage 68 is formed within the first partition wall 111 of the first housing 110. As shown in Figure 4, the supply passage 68 is formed directly above the motor shaft 11c. The supply passage 68 supplies oil to the main passage 60. The upper end of the supply passage 68 is connected to the main passage 60. The supply passage 68 extends downward from the main passage 60. The lower end of the supply passage 68 is located above the motor shaft 11c and near the outer circumference of the motor rotor 11a of the drive motor 11. The supply passage 68 also supplies oil to the motor rotor 11a of the drive motor 11 and to the reduction gear 12.

[0075] A communication hole 681 is formed in the middle of the supply passage 68. The communication hole 681 opens to the left on the left surface of the first partition wall 111. The second oil pipe 72 is connected to the communication hole 681.

[0076] The oil discharged by the oil pump 51 flows through the first oil pipe 71, the oil cooler 52, and the second oil pipe 72 in that order, and into the supply passage 68. From the supply passage 68, the oil flows into the main passage 60 and is supplied to the drive motor 11, the reduction gear 12, and the generator 13, respectively, through the distribution passages 61 to 67, or from the supply passage 68.

[0077] (Oil supply structure to the coil end) Here, the motor coil 11g and the power generation coil 13g are cooled by supplying oil to the motor coil end portions 11gL, 11gR and the power generation coil end portions 13gL, 13gR. If the cooling of the motor coil 11g and the power generation coil 13g is insufficient, a temperature distribution will occur in each coil 11g and 13g, leading to increased heat loss in the drive motor 11 and a deterioration in the power generation efficiency of the generator 13. Conventionally, the coil end portions 11gL, 11gR, 13gL, and 13gR were cooled by supplying oil from the radially outer side of each coil end portion 11gL, 11gR, 13gL, and 13gR. However, for the right motor coil end section 11gR to which the motor lead wire 11h is connected, and the left power generation coil end section 13gL to which the power generation lead wire 13h is connected, the oil supply structure must be configured while considering the routing structure of the lead wires 11h and 13h, which may worsen the layout.

[0078] Therefore, in this embodiment, the oil supply structure to the right motor coil end portion 11gR and the left power generation coil end portion 13gL has been devised to efficiently cool the motor coil 11g and the power generation coil 13g while suppressing deterioration of layout. The oil supply structure to the right motor coil end portion 11gR will be described below. The supply structure to the left power generation coil end portion 13gL is basically the same as the supply structure to the right motor coil end portion 11gR, so a detailed explanation will be omitted. In the following explanation, "axial direction" refers to the axial direction of the motor shaft 11c, and "radial direction" refers to the radial direction of the motor shaft 11c.

[0079] In this embodiment, the oil supply structure to the right motor coil end portion 11gR is configured to supply oil to the right motor coil end portion 11gR from the axial side, particularly from the right side. Specifically, a recess 132 formed in the right side wall portion 131 of the right end cover 130 and recessed toward the right (i.e. toward the opposite side from the right motor coil end portion 11gR), and a plate member 91 covering the recess 132 from the axial side, constitute a lateral oil passage 92 to the right of the right motor coil end portion 11gR.

[0080] As shown in Figure 8, the recess 132 is an annular shape formed along the circumferential direction of the right motor coil end portion 11gR when viewed from the axial direction. The recess 132 is formed opposite the outermost radial layer of the right motor coil end portion 11gR which is stacked radially. Because the recess 132 is annular, the lateral oil passage 92 is also annular. The recess 132 is formed by casting.

[0081] The recess 132 is connected to the first distribution passage 61 at its uppermost part. Specifically, a lateral hole 61a extends from the lower end of the first distribution passage 61 toward the left, and this lateral hole 61a communicates with the uppermost part of the recess 132. As a result, the first distribution passage 61 is connected to the uppermost part 92a (see Figure 9) of the lateral oil passage 92 via the lateral hole 61a.

[0082] As shown in Figures 6 and 7, the plate member 91 is flat. As shown in Figures 7 and 9, the plate member 91 has a width in the radial direction of the motor shaft 11c and is an annular shape along the recess 132. The radial width of the plate member 91 is greater than the groove width of the recess 132. The plate member 91 is made of metal.

[0083] As shown in Figure 9, the radially outer end of the plate member 91 has multiple (four in this case) mounting portions 91a for attaching and fixing the plate member 91 to the right end cover 130. Each mounting portion 91a is formed to protrude radially outward from the plate member 91. Each mounting portion 91a is formed with spacing in the circumferential direction. Each mounting portion 91a is arranged so that the spacing between adjacent mounting portions 91a in the circumferential direction is not equal; that is, at least one of the spacings between adjacent mounting portions 91a is different from the others. This facilitates the circumferential positioning of the plate member 91. As shown in Figure 9, each mounting portion 91a is attached and fixed to the right side wall portion 131 of the right end cover 130 with bolts 93. With each mounting portion 91a attached to the right side wall portion 131, the bolts 93 are in an axially extended position.

[0084] The plate member 91 is provided with a plurality of oil supply holes 91b. These oil supply holes 91b are for supplying oil from the lateral oil passage 92 to the right motor coil end portion 11gR. The plurality of oil supply holes 91b are provided at intervals in the circumferential direction of the plate member 91. Each oil supply hole 91b is formed by drilling into the plate member 91. Each oil supply hole 91b extends parallel to the axial direction of the motor shaft 11c.

[0085] As shown in Figure 9, each oil supply hole 91b is arranged mirror-symmetrically with respect to a straight line L that passes through the uppermost part 92a of the lateral oil passage 92 and the center of the motor shaft 11c, when viewed from the axial direction. Furthermore, there are more oil supply holes 91b on the lower part of the plate member 91 than on the upper part. Specifically, there are four oil supply holes 91b on the upper part of the plate member 91 and six oil supply holes 91b on the lower part.

[0086] A liquid gasket is provided at the mating surface between the right side wall portion 131 and the plate member 91. This prevents oil from leaking from the lateral oil passage 92.

[0087] As shown in Figures 8 to 10, a receiving tray 94 is provided at a position radially inward from the plate member 91 and above the motor shaft 11c to receive oil dripping from the upper part of the right motor coil end portion 11gR. The receiving tray 94 extends in the front-rear direction and has an arch shape with its center in the front-rear direction positioned above the front and rear ends. The front end of the receiving tray 94 is located in front of the motor shaft 11c, and the rear end of the receiving tray 94 is located behind the motor shaft 11c. The receiving tray 94 has a plurality of vertical wall portions 94a. The vertical wall portions 94a extend along the entire front-rear direction of the receiving tray 94. Although not shown, the front and rear ends of the receiving tray 94 do not have vertical wall portions 94a and are open in the front-rear direction, respectively. The receiving tray 94 is fixed to the right side wall portion 131 with bolts 95.

[0088] The oil supplied to the lateral oil passage 92 branches from the uppermost part 92a to both the clockwise and counterclockwise sides. Then, as shown in Figure 10, the oil is injected from the right side to the right motor coil end portion 11gR through each oil supply hole 91b by the hydraulic pressure applied to the lateral oil passage 92. Since the oil supply holes 91b are formed in both the upper and lower parts of the plate member 91, cooling oil is supplied from the right side to both the upper and lower parts of the right motor coil end portion 11gR. Since the lateral oil passage 92 faces the outermost radial layer of the right motor coil end portion 11gR, the oil is supplied to the outermost radial layer. The supplied oil penetrates the upper part of the right motor coil end portion 11gR in the circumferential and radial directions by gravity and capillary action, while it penetrates the lower part of the right motor coil end portion 11gR in the circumferential and radial directions by capillary action.

[0089] Furthermore, after being supplied to the upper part of the right motor coil end section 11gR, some of the oil that flows downward due to gravity is collected in the receiving tray section 94. The oil collected in the receiving tray section 94 moves along the receiving tray section 94 in the front-rear direction and drips from the front and rear ends of the receiving tray section 94 to the lower part of the right motor coil end section 11gR. This ensures that oil is properly supplied to the radially inner part of the lower part of the right motor coil end section 11gR, which is otherwise difficult to reach.

[0090] These factors enable proper cooling of the entire right motor coil end section 11gR. In particular, even if the right motor coil end section 11gR has a layered structure, oil can be properly supplied to each layer. Furthermore, since the lateral oil passage 94 is formed on the right side of the right motor coil end section 11gR, there is no need to consider the routing structure of the motor lead wires 11h. This also helps to suppress deterioration of layout.

[0091] Accordingly, according to this embodiment, the drive motor 11 has a motor shaft 11c extending in the left-right direction, a motor rotor 11a fixed to the motor shaft 11c, a motor stator 11b located radially outward of the motor shaft 11c than the motor rotor 11a, and a motor coil 11g wound around the motor stator 11b; a second housing 120 and a right end cover 130 housing the drive motor 11; a motor lead wire 11h that passes between the drive motor 11 and the right end cover 130 in the radial direction of the motor shaft 11c and is connected from the radially outward to the right motor coil end portion 11gR, electrically connecting the drive motor 11 and the motor inverter 21; and an oil supply system 5 that supplies oil to the right motor coil end portion 11gR, wherein the oil supply system 5 is configured to supply oil from the right side to the upper part of the right motor coil end portion 11gR. As a result, when the motor lead wire 11h is connected to the right motor coil end portion 11gR from the radially outside in order to supply oil to the right motor coil end portion 11gR from the side, the degree of freedom in the routing structure of the motor lead wire 11h is improved. Therefore, the cooling efficiency of the right motor coil end portion 11gR can be made as high as possible while suppressing deterioration of layout.

[0092] Furthermore, in this embodiment, the oil supply system 5 has a lateral oil passage 92 formed by the right side wall portion 131 of the right end cover 130 facing the right motor coil end portion 11gR in the axial direction, and a plate member 91 attached to the right side wall portion 131, and an oil supply hole 91b provided in the plate member 91 for supplying oil from the lateral oil passage 92 to the right motor coil end portion 11gR. The lateral oil passage 92 includes a recess 132 formed in the right side wall portion 131 that is recessed toward the opposite side of the right motor coil end portion 11gR in the axial direction. This makes it easy to create a configuration for supplying oil to the right motor coil end portion 11gR from the side. In particular, since the oil supplied to the lateral oil passage 92 is released from the oil supply hole 91b of the plate member 91, it is easy to apply pressure to the oil, and oil can be appropriately supplied to the right motor coil end portion 11gR even from the side. As a result, the cooling efficiency of the 11gR coil end section for the right motor can be further improved.

[0093] In particular, in this embodiment, the recess 132 and the plate member 91 form an annular shape along the circumferential direction of the right motor coil end portion 11gR, and multiple oil supply holes 91b are provided at intervals in the circumferential direction of the plate member 91. This allows oil to be supplied to the entire circumferential direction of the right motor coil end portion 11gR. As a result, the cooling efficiency of the right motor coil end portion 11gR can be increased.

[0094] Furthermore, in this embodiment, the oil supply system 5 has a main passage 60 formed above the plate member 91 so as to extend axially within the wall of the drive unit housing 100, and a first distribution passage 61 that connects the uppermost part 92a of the lateral oil passage 92 with the main passage 60. This makes it possible to shorten the oil supply path from the main passage 60 to the lateral oil passage 92 as much as possible. Also, because the uppermost part 92a of the lateral oil passage 92 is connected to the main passage 60, it becomes easier to distribute oil throughout the entire lateral oil passage 92. As a result, it becomes easier to apply hydraulic pressure to the entire lateral oil passage 92, and oil can be properly supplied to the right motor coil end section 11gR from each oil supply hole 91b. As a result, the cooling efficiency of the right motor coil end section 11gR can be increased.

[0095] Furthermore, in this embodiment, the multiple oil supply holes 91b are arranged symmetrically with respect to a straight line L that passes through the uppermost part 92a of the lateral oil passage 92 and the center of the motor shaft 11c when viewed from the axial direction. This makes it less likely for differences in hydraulic pressure to occur between the clockwise and counterclockwise sides with respect to the uppermost part 92a of the lateral oil passage 92. As a result, variations in the amount of oil supplied are less likely to occur, and the cooling efficiency of the right motor coil end portion 11gR can be further improved.

[0096] Furthermore, in this embodiment, the oil supply holes 91b are more numerous in the lower portion of the plate member 91 than in the upper portion. By forming many oil supply holes 91b in positions corresponding to the lower portion of the lateral oil passage 92, where the oil pressure tends to be relatively lower, it becomes less likely for there to be a difference in the amount of oil supplied between the upper and lower portions of the right motor coil end portion 11gR. This makes it possible to further improve the cooling efficiency of the right motor coil end portion 11gR.

[0097] Furthermore, in this embodiment, the mounting portions 91a of the plate member 91 are provided in multiple locations at intervals in the circumferential direction of the plate member 91, and at least one of the intervals between adjacent mounting portions 91a in the circumferential direction is arranged to be different from the other intervals. That is, as described above, in order to attach the plate member 91 to the right end cover 130 so that the oil supply holes 91b are mirror-symmetrical and the number of oil supply holes 91b is greater in the lower portion than in the upper portion, it is necessary to properly position the plate member 91 in the circumferential direction. With the above configuration, the circumferential positioning of the plate member 91 can be easily performed by using the portions with different intervals as a guide.

[0098] Furthermore, in this embodiment, the recess 132 is formed in the right end cover 130, and the plate member 91 is a flat plate that covers the recess 132. This makes it easy to form the lateral oil passage 92 and suppresses the axial expansion of the electric drive unit 10 as much as possible.

[0099] Furthermore, in this embodiment, the right motor coil end portion 11gR is stacked in multiple layers in the radial direction, and the oil supply system 5 is configured to supply oil to the outermost radial portion of the right motor coil end portion 11gR. This allows oil to be efficiently distributed throughout the entire right motor coil end portion 11gR. As a result, the cooling efficiency of the right motor coil end portion 11gR can be further improved.

[0100] As shown in Figure 5, the oil supply structure to the left power generation coil end portion 13gL is configured, as described above, to form an annular lateral oil passage 92 by the plate member 91 and the recess formed in the left end cover 140. The lateral oil passage 92 on the generator 13 side is connected to the main passage 60 by a seventh distribution passage 67 provided in the left side wall portion 141 of the left end cover 140. The mounting portion 91a is attached to the left side wall portion 141 by bolts.

[0101] (Other embodiments) The technologies disclosed herein are not limited to the embodiments described above and may be substituted insofar as they do not depart from the spirit of the claims.

[0102] For example, in the embodiment described above, the lateral oil passage 92 was annular in shape, running along the circumferential direction of the right motor coil end portion 11gR and the left power generation coil end portion 13gL. However, it is not limited to this configuration; the lateral oil passage 92 may be provided only in the portion facing the upper portion of the right motor coil end portion 11gR and the left power generation coil end portion 13gL. In this case, the plate member 91 does not need to be annular, but only needs to be arch-shaped to form the lateral oil passage 92. Even with this configuration, oil can be supplied from the axial side to at least the upper portion of the right motor coil end portion 11gR and the left power generation coil end portion 13gL. The lower portion of each coil end portion 11gR, 13gL is cooled by the oil processed by gravity from the upper portion.

[0103] Furthermore, in the above-described embodiment, recesses were formed only in the right end cover 130 and the left end cover 140, and the plate member 91 was flat. However, the plate member 91 may also be provided with recesses that are recessed away from the corresponding end cover. Alternatively, the right end cover 130 and the left end cover 140 may not have recesses, and recesses may be provided only in the plate member 91. Even with these configurations, the lateral oil passage 92 can be formed.

[0104] Furthermore, in the above-described embodiment, each oil supply hole 91b was formed parallel to the axial direction. However, it is not limited to this, and they may extend inclined with respect to the axial direction of the motor shaft 11c. For example, each of the lower oil supply holes 91b may be formed inclined toward the innermost layer of the right motor coil end portion 11gR.

[0105] The embodiments described above are merely illustrative and should not be interpreted as limiting the scope of this disclosure. The scope of this disclosure is defined by the claims, and any variations or modifications within the equivalent scope of the claims are all within the scope of this disclosure. [Industrial applicability]

[0106] The technology disclosed herein is useful as a configuration for efficiently cooling the coil end portion in a rotating electric machine unit while suppressing deterioration of layout. [Explanation of symbols]

[0107] 5. Supply System (Oil Supply Section) 11. Drive motor (rotating electric machine body) 11a Motor rotor 11b Stator for motor 11c Motor shaft (rotating axis) 11g motor coil 11gR Right motor coil end section 11h Motor lead wires 13. Generator (Rotating Electric Machine Body) 13a Rotor for power generation 13b Power generation stator 13c Generator shaft (rotating axis) 13g power generation coil 13gL Left-hand power generation coil end 13h Lead wire for power generation 60 Main aisle 61 1st distribution passage 67 7th distribution aisle 91 Plate Member 91a Mounting part 91b Oil supply port 92 Lateral oil passage 92a Top 130 Right end cover (housing) 132 recess 140 Left end cover (housing)

Claims

1. A rotating electric machine unit, A rotating electric machine body having a horizontally extending rotating shaft, a rotor fixed to the rotating shaft, a stator located radially outward from the rotor relative to the rotating shaft, and a coil wound around the stator, A housing for the rotating electric machine body, A lead wire passes between the rotating electric machine body and the housing in the radial direction of the rotating shaft, is connected to the coil end portion of the coil from the radially outer side, and electrically connects the rotating electric machine body and the power converter. The system includes an oil supply unit that supplies oil to the coil end portion, The oil supply unit is configured to supply oil to the upper portion of the coil end from the axial side in which the rotating shaft extends. The aforementioned oil supply unit is A lateral oil passage is formed by the coil end portion, the wall surface of the housing facing the axial direction, and a plate member attached to the wall surface, and is located to the side of the coil end portion in the axial direction, The plate member is provided with an oil supply hole that supplies oil from the lateral oil passage to the coil end portion, On the upper side of the plate member, a main passage is formed within the wall portion of the housing so as to extend in the axial direction, It has, The lateral oil passage is formed in at least one of the wall surface of the housing and the plate member, and is formed by a recess that is recessed in the axial direction. The recess and the plate member are annular in shape formed along the circumferential direction of the coil end portion. The oil supply holes are provided in multiple locations on the plate member at intervals in the circumferential direction. The main passage is in communication with the upper part of the lateral oil passage. A rotating electric machine unit characterized in that the plurality of oil supply holes are provided in greater numbers in the lower portion than in the upper portion of the plate member.

2. In the rotating electric machine unit according to claim 1, The recess is formed on the wall surface of the housing, The rotating electric machine unit is characterized in that the plate member has a flat plate shape that covers the recess.

3. In the rotating electric machine unit according to claim 1 or 2, The rotating electric machine unit is characterized in that the oil supply unit further has a distribution passage that connects the uppermost part of the lateral oil passage and the main passage.

4. In the rotating electric machine unit according to claim 3, The rotating electric machine unit is characterized in that the plurality of oil supply holes are arranged symmetrically with respect to a straight line passing through the uppermost part of the lateral oil passage and the center of the rotation axis when viewed from the axial direction.

5. In the rotating electric machine unit according to any one of Claims 1 to 4, The coil end portion is stacked in multiple layers in the radial direction. The rotating electric machine unit is characterized in that the oil supply unit is configured to supply oil to the outermost radially located portion of the coil end.

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