Rotating electric machines

Abstract

To efficiently cool a coil end portion of a rotary electric machine.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, and an oil supply part supplying oil to the coil end part of the coil. A cylindrical plate is provided between the inner circumferential wall surface of the housing and the coil end part in the radial direction of the rotary shaft. The oil supply part has a circular oil passage formed by the cooperation of the inner circumferential wall surface of the housing and the cylindrical plate and a plurality of oil supply holes provided on the circumferential direction of the cylindrical plate to supply oil from the circular oil passage to the coil end part.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The technology disclosed herein belongs to the technical field of rotating electrical machines. [Background technology]

[0002] In recent years, most electric machines use rotating electric machines, such as motors that run on electricity or generators that generate electricity through rotation. Rotating electric machines need to maintain their coils at an appropriate temperature. For this reason, structures for supplying refrigerant to the coils have been proposed.

[0003] For example, Patent Document 1 discloses a cooling structure for the coil end portion in which three oil discharge holes are provided above the coil end portion along the outer periphery of the coil end portion, and oil is dripped onto the coil end portion from the oil discharge holes. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Application Publication No. 2011 / 32784 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the configuration of Patent Document 1, while the upper portion of the coil end is cooled efficiently, the lower portion of the coil end comes into contact with oil that has been heated by heat exchange with the upper portion of the coil end, so no cooling effect can be expected for the lower portion of the coil end. Furthermore, if the cooling effect is inconsistent and a temperature distribution occurs, the operating efficiency of the rotating electrical machine may deteriorate.

[0006] The technique disclosed herein has been made in view of the above points, and its purpose is to efficiently cool the coil end portion of a rotating electrical machine. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the technology disclosed herein is directed to a rotating electric machine, and includes a rotating electric machine main body having a rotating shaft, a rotor fixed to the rotating shaft, and a stator located radially outward of the rotor from the rotating shaft, a housing that accommodates the rotating electric machine main body, and an oil supply unit that supplies oil to a coil end portion of a coil wound around the stator, wherein the coil end portion is located outer than the rotor in the axial direction of the rotating shaft, and a cylindrical plate that is provided along the outer periphery of the coil end portion as viewed from the axial direction and has a width in the axial direction is provided between an inner circumferential wall surface of the housing and the coil end portion in the radial direction of the rotating shaft, and the oil supply unit has an annular oil passage formed by the inner circumferential wall surface of the housing and the cylindrical plate cooperating with each other, and a plurality of oil supply holes that are provided circumferentially of the cylindrical plate and supply oil from the annular oil passage to the coil end portion.

[0008] With this configuration, an annular oil passage is provided along the outer periphery of the coil end portion, and oil is supplied from the annular oil passage to the coil end portion via multiple oil supply holes. This makes it possible to supply oil to the coil end portion from the entire outer periphery of the coil end portion, thereby efficiently cooling the coil end portion.

[0009] In the rotating electric machine, the annular oil passage may be configured by a recess formed on an outer peripheral surface of the cylindrical plate and recessed radially inward, and an inner peripheral wall surface of the housing.

[0010] With this configuration, there is no need to process the inner peripheral wall surface of the housing in order to form the annular oil passage, which makes it possible to easily form the annular oil passage.

[0011] In one embodiment of the rotating electric machine, the rotating shaft extends horizontally, and the oil supply section further has a main passage formed above the cylindrical plate within the wall of the housing so as to extend in the axial direction, and a distribution passage connecting the top of the annular oil passage with the main passage.

[0012] This configuration allows the oil supply path from the main passage to the annular oil passage to be as short as possible. Furthermore, the communication between the top of the annular oil passage and the main passage facilitates oil distribution throughout the entire annular oil passage. This makes it easier to apply oil pressure to the entire annular oil passage, allowing oil to be appropriately supplied to the coil end sections from each oil supply hole. As a result, the coil end sections can be cooled more efficiently.

[0013] In the one embodiment, the plurality of oil supply holes are arranged at a distance of 1 / 2 mm from the center of the rotation shaft to the uppermost portion of the rotary shaft as viewed in the axial direction. Against The configuration may be such that the electrodes are arranged in parallel.

[0014] In other words, if the oil supply holes are asymmetrically formed, differences in oil pressure tend to occur between the clockwise and counterclockwise sides of the top of the annular oil passage, which tends to cause variations in the amount of oil supplied. With the above configuration, differences in oil pressure are less likely to occur between the clockwise and counterclockwise sides of the top of the annular oil passage. As a result, variations in the amount of oil supplied are less likely to occur, and the coil end portion can be cooled more efficiently.

[0015] In the embodiment, the plurality of oil supply holes may be provided in greater numbers in a lower portion of the cylindrical plate than in an upper portion thereof.

[0016] In other words, the oil pressure in the lower portion of the annular oil passage is lower than in the upper portion of the annular oil passage. Therefore, by forming more oil supply holes in the lower portion of the cylindrical plate than in the upper portion, the difference in the amount of oil supplied to the upper and lower portions of the coil end portion is reduced. This allows the coil end portion to be cooled more efficiently.

[0017] In the rotating electric machine, the axial width of the cylindrical plate may be larger than the axial width of the coil end portion, the housing may have a vertical wall portion extending in a direction intersecting the axial direction, one side end of the cylindrical plate in the axial direction may have an attachment portion that protrudes radially outward and is attached to the vertical wall portion, and the attachment portion may be attached to the vertical wall portion by an axial fastening member that extends in the axial direction.

[0018] With this configuration, the cylindrical plate can be fitted into the housing in the axial direction of the rotating shaft and attached to the housing via the axial fastening portion, which makes it possible to easily attach the cylindrical plate to the housing and prevent the cylindrical plate from shifting and thus the annular oil passage from shifting even if an axial load is applied to the cylindrical plate. [Effects of the Invention]

[0019] As described above, according to the technique disclosed herein, the coil end portion of a rotating electrical machine can be efficiently cooled. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a schematic diagram illustrating a drive system of a vehicle in which a rotating electric machine according to an exemplary embodiment is provided. [Figure 2] FIG. 2 is a plan view of the front part of the vehicle as seen from above. [Figure 3] FIG. 3 is a front view of the power unit. [Figure 4]FIG. 4 is a view of the reducer as seen from the generator side. [Figure 5] FIG. 5 is a cross-sectional view of the power unit taken along a plane along the direction of the rotation axis of the motor. [Figure 6] FIG. 6 is an enlarged view of the dashed line portion of FIG. [Figure 7] FIG. 7 is a view of the first housing seen from the drive motor side, with the drive motor omitted. [Figure 8] FIG. 8 is a perspective view of a cylindrical plate. [Figure 9] FIG. 9 is a perspective view of the first housing as seen from the drive motor side, with the drive motor omitted. [Figure 10] FIG. 10 is a partial cross-sectional view of a cylindrical plate. [Figure 11] FIG. 11 is a cross-sectional view taken along a plane corresponding to the line XX in FIG. [Figure 12] FIG. 12 is a perspective view of the periphery of the right motor coil end portion as viewed obliquely. [Figure 13] FIG. 13 is a view of the right end cover seen from the drive motor side, with the drive motor omitted. DETAILED DESCRIPTION OF THE INVENTION

[0021] Exemplary embodiments will be described in detail below 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. When looking from the rear to the front, the left side is referred to as left, and the right side is referred to as right. The left and right directions also refer to the vehicle width direction. In the following description, "power generation XX" means that the device is primarily used to operate the generator 13, and is not limited to being used only for power generation.

[0022] (Overall configuration of a vehicle drive system) Fig. 1 is a block diagram of a vehicle drive device. Fig. 1 only shows a schematic representation of each element constituting a drive device P mounted on a vehicle 1. The position of each element in Fig. 1 does not limit the actual position of each element.

[0023] The vehicle 1 is a series hybrid vehicle and is equipped with a drive system P including an electric drive unit 10 for propelling the vehicle 1 using electric power and an engine E for generating electricity.

[0024] The electric drive unit 10 has a drive motor 11, a reducer 12, and a generator 13. The drive motor 11 is driven by electric power. The reducer 12 reduces the speed of the drive motor 11. The generator 13 generates electricity to be supplied to the drive motor 11.

[0025] The engine E is connected to a generator 13. The engine E drives the generator 13 so that the generator 13 generates electricity. The power for propelling the vehicle 1 is generated by a drive motor 11. The power generated by the drive motor 11 is changed in speed by a reducer 12 and then transmitted to drive wheels 42 (front wheels in this case) via a differential device 41.

[0026] The vehicle 1 includes a high-voltage battery B1 and a low-voltage battery B2. The high-voltage battery B1 is charged with electricity generated by a generator 13. A power generation inverter 22 is provided between the generator 13 and the high-voltage battery B1. The power generation inverter 22 is electrically connected to the generator 13 and the high-voltage battery B1. Electricity generated by the generator 13 is supplied to the high-voltage battery B1 via the power generation 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 electricity from the high-voltage battery B1 into power for driving the drive motor 11 and outputs the power 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. Electricity from the high-voltage battery B1 is supplied to the low-voltage battery B2 via the DC-DC converter 23. The electricity generated by the generator 13 is supplied to the low-voltage battery B2 via a power generation inverter 22 and a DC-DC converter 23. The motor inverter 21, the power generation inverter 22, and the DC-DC converter 23 constitute a control unit 20 that controls the electric drive unit 10.

[0027] (Drive unit mounting structure on vehicle) As shown in Fig. 2, the drive unit P is disposed in a power unit room 2 formed in the front part of the vehicle 1. More specifically, the vehicle 1 has a pair of left and right front side frames 31 extending in the longitudinal direction, and the power unit room 2 for disposing the drive unit P is formed between the 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.

[0028] 3, the electric drive unit 10 and the control unit 20 are arranged next to each other in the vertical direction. Specifically, the control unit 20 is located above the electric drive unit 10.

[0029] 4 and 5, the drive motor 11, the reducer 12, and the generator 13 are housed in a housing 100. The housing 100 is configured by integrating multiple members. The housing 100 has a first housing 110, a second housing 120, a right end cover 130, and a left end cover 140.

[0030] The first housing 110 and the second housing 120 each have a cylindrical shape with both left and right ends open. The left end cover 140 and the right end cover 130 each have a lid shape with the right or left end closed. The second housing 120 is disposed on the left side of the first housing 110, and the left end cover 140 is disposed on the left side of the second housing 120. The right end cover 130 is disposed on the right side of the first housing 110. The right end cover 130, first housing 110, second housing 120, and left end cover 140 are arranged in this order from right to left. The first housing 110, second housing 120, right end cover 130, and left end cover 140 are joined by bolts at flanges provided on the left and right ends.

[0031] 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 are formed by casting.

[0032] The engine E is disposed on the left side of the left end cover 140. In other words, the engine E is located on the left side of the electric drive unit 10.

[0033] As shown in FIG. 5, the first housing 110 has a first partition wall 111 for dividing the interior of the housing 100 into multiple compartments. The first partition wall 111 extends in a direction intersecting the left-right direction at a central position in the left-right direction of the first housing 110. More specifically, the first partition wall 111 extends in both the up-down direction and the front-rear direction, which are orthogonal to the left-right direction (see also FIG. 4). The second housing 120 has a second partition wall 121. The second partition wall 121 also extends in a direction intersecting the left-right direction, more specifically, in both the up-down direction and the front-rear direction, which are orthogonal to the left-right direction, at a central position in the left-right direction of the second housing 120.

[0034] The drive motor 11 is housed in a first chamber 101 separated by the right end cover 130 and the first partition wall 111 of the first housing 110. The generator 13 is housed in a third chamber 103 separated by the second partition wall 121 of the second housing 120 and the left end cover 140. The reducer 12 is housed in a second chamber 102 separated by the first partition wall 111 and the second partition wall 121.

[0035] (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 AC 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.

[0036] The motor rotor 11a is located in the first chamber 101. The motor rotor 11a has a magnet and a magnetic body. The motor rotor 11a and the motor shaft 11c rotate together.

[0037] 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 passes through the first partition wall 111 of the first housing 110 and extends to the second chamber 102. The second bearing 11e rotatably supports the left end of the motor shaft 11c. The first boss 122, which is formed integrally with the second partition wall 121, holds the second bearing 11e. The first boss 122 protrudes leftward from the second partition wall 121.

[0038] The motor stator 11b is held by the first housing 110 and the right end cover 130. A motor coil 11g is wound around the motor stator 11b.

[0039] The left and right motor coil end portions 11gL and 11gR 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 a motor lead wire 11h. The motor lead wire 11h is connected to the right motor coil end portion 11gR from the radial outside. The motor lead wire 11h extends outside the first housing 110 to the right of the left motor coil end portion 11gL. Therefore, the motor lead wire 11h is not present around the left motor coil end portion 11gL within the first housing 110.

[0040] <generator> The generator 13 includes 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 are rotated by the power of the engine E, electricity is generated in the power generation stator 13b by electromagnetic induction.

[0041] The power generation rotor 13a is located in the third chamber 103. The power generation rotor 13a has a magnet and a magnetic body. The power generation rotor 13a and the generator shaft 13c rotate together.

[0042] The generator shaft 13c extends in the vehicle width direction. The generator shaft 13c and the motor shaft 11c are positioned coaxially. The third bearing 13d rotatably supports the left end of the generator shaft 13c. A second boss portion 123 formed integrally with the second partition wall 121 holds the third bearing 13d. The second boss portion 123 protrudes rightward from the second partition wall 121. The generator shaft 13c abuts against the motor shaft 11c at the second partition wall 121.

[0043] 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 the 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.

[0044] The power generation stator 13b is held in the second housing 120. A power generation coil 13g is wound around the power generation stator 13b.

[0045] The left and right power generation coil end portions 13gL and 13gR, which are the left and right ends of the power generation coil 13g, 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 a power generation lead wire 13h. The power generation lead wire 13h is connected to the left power generation coil end portion 13gL from the radial outside. The power generation lead wire 13h extends outside the second housing 120 to the left of the right power generation coil end portion 13gR. Therefore, the power generation lead wire 13h is not present around the right power generation coil end portion 13gR within the second housing 120.

[0046] The outer diameter of the drive motor 11 is the same as the outer diameter of the generator 13. More specifically, the outer diameter of the motor rotor 11a of the drive motor 11 is the same as the outer diameter of the power generation rotor 13a of the generator 13, and the outer diameter of the motor stator 11b of the drive motor 11 is the same as the outer diameter of the power generation stator 13b of the generator 13. The first housing 110 and the second housing 120 have similar outer shapes so that they can accommodate the drive motor 11 and the generator 13, which have the same outer diameter (see FIG. 4).

[0047] 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.

[0048] <Reduction gear> As described above, the reducer 12 is located between the drive motor 11 and the generator 13. The reducer 12 is located to the left of the drive motor 11 in the left-right direction. The reducer 12 is also located behind the motor shaft 11c in the front-rear direction.

[0049] The reducer 12 is a parallel-axis gear reducer. As shown in FIG. 4, the 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.

[0050] 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 in the left-right direction at a position rearward of the motor shaft 11c. The housing 100 rotatably supports the first shaft 12d.

[0051] 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.

[0052] 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 in the left-right direction at a position behind and below the first shaft 12d. The housing 100 rotatably supports the second shaft 12e.

[0053] The second shaft 12e is connected to a drive shaft 43 via a differential device 41. As shown in FIG. 2, the drive shaft 43 extends to the left and right at a rear position of the housing 100. The reducer 12 reduces the output of the drive motor 11 at a predetermined reduction ratio and outputs the reduced output to the differential device 41.

[0054] (oil supply system) The drive device P includes a supply system 5 that supplies lubricating and / or cooling oil to each of the drive motor 11, the reducer 12, and the generator 13. 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.

[0055] An oil reservoir 105 is formed in the lower part of the second chamber 102 inside the housing 100. As will be described later, oil supplied to each of the drive motor 11, the reducer 12, and the generator 13 falls downward due to gravity. The oil that falls downward flows in the left-right direction toward the center of the housing 100 and collects in the lower part of the second chamber 102. The oil circulates within the housing 100.

[0056] A strainer 53 is installed in the oil reservoir 105. The strainer 53 separates the 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 stored in the oil reservoir 105.

[0057] The oil pump 51 is attached to the outside of the housing 100. The oil pump 51 is attached to the bottom of the housing 100. The oil pump 51 sucks oil from the oil reservoir 105 through a strainer 53 and discharges it from a discharge port. The oil pump 51 is electrically driven.

[0058] A first oil pipe 71 is connected to the discharge port of the oil pump 51. The first oil pipe 71 is disposed inside the second chamber 102. The first oil pipe 71 connects the oil pump 51 and the oil cooler 52.

[0059] The oil cooler 52 is a water-cooled heat exchanger that exchanges heat 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 device P. The oil cooler 52 has an inlet 521 and an outlet 522 for the cooling water.

[0060] The oil cooler 52 is disposed 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 up-down direction. As shown in FIG. 4, this position corresponds to a position below the drive motor 11. The oil cooler 52 is disposed so as not to protrude forward beyond the front end of the housing 100. This arrangement is advantageous in terms of improving the collision safety of the vehicle 1.

[0061] A first through hole 112 and a second through hole 113 are formed in the first partition wall 111 of the first housing 110 (see FIG. 4). The first through hole 112 and the second through hole 113 each extend substantially radially to provide communication between the inside and outside of the housing 100. The first through hole 112 and the second through hole 113 are, for example, cast holes formed during casting. An oil inlet of the oil cooler 52 is connected to the first through hole 112, and an oil outlet is connected to the second through hole 113.

[0062] 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 and the oil passage 6.

[0063] The oil passage 6 is made up of a main passage 60, a plurality of distribution passages 61 to 67, and a supply passage 68. These passages 60 to 68 are, for example, cast holes formed during casting.

[0064] 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.

[0065] The 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.

[0066] The second distribution passage 62 is formed in the middle 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.

[0067] The third distribution passage 63 is formed on the right side 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.

[0068] The fourth distribution passage 64 is formed in the second partition wall 121 of the second housing 10. The fourth distribution passage 64 extends downward from the main passage 60 to near the positions 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 generator rotor 13a of the generator 13 via the motor shaft 11c and the generator shaft 13c.

[0069] The fifth distribution passage 65 is formed on the left side of the second partition wall 121 of the second housing 10. The fifth distribution passage 65 mainly supplies oil to the right generating coil end portion 13gR of the generator 13.

[0070] The sixth distribution passage 66 is formed in the middle between the left and right sides of the second housing 10. The sixth distribution passage 66 mainly supplies oil to the power generation stator 13b of the generator 13.

[0071] The seventh distribution passage 67 is formed in the left end cover 140. The seventh distribution passage 67 mainly supplies oil to the left generating coil end portion 13gL of the generator 13.

[0072] The supply passage 68 is formed in the first partition wall 111 of the first housing 110. As shown in FIG. 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 periphery 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 reducer 12.

[0073] A communication hole is formed in the middle of the supply passage 68. The communication hole opens leftward on the left surface of the first partition wall 111. The second oil pipe 72 is connected to the communication hole.

[0074] The oil discharged from the oil pump 51 flows through the first oil pipe 71, the oil cooler 52, and the second oil pipe 72 in this order, and then into the supply passage 68. The oil flows from the supply passage 68 to the main passage 60, and is supplied to the drive motor 11, the reducer 12, and the generator 13 via each of the distribution passages 61 to 67 or from the supply passage 68.

[0075] (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 motor coil 11g and the power generation coil 13g are not cooled sufficiently, a temperature distribution will occur in each coil 11g, 13g, which will increase heat loss in the drive motor 11 and reduce the power generation efficiency of the generator.

[0076] Therefore, in this embodiment, the oil supply structure to the motor coil end portions 11gL, 11gR and the power generation coil end portions 13gL, 13gR has been devised to enable efficient cooling of the motor coil 11g and the power generation coil 13g. The oil supply structure to the motor coil end portions 11gL, 11gR will be described below. The supply structure for the power generation coil end portions 13gL, 13gR is basically the same as the supply structure for the motor coil end portions 11gL, 11gR, so a detailed description will be omitted. In the following description, the axial direction refers to the axial direction of the motor shaft 11c, and the radial direction refers to the radial direction of the motor shaft 11c.

[0077] First, the structure for supplying oil to the left motor coil end portion 11gL to which the motor lead wire 11h is not connected will be described with reference to FIGS.

[0078] 6, in this embodiment, a cylindrical plate member 81 (hereinafter referred to as the cylindrical plate 81) is disposed between the inner circumferential wall surface of the first housing 110 in the radial direction and the left motor coil end portion 11gL, and an annular oil passage 82 (hereinafter referred to as the annular oil passage 82) is formed by the inner circumferential wall surface of the second housing 120 and the cylindrical plate 81. The annular oil passage 82 is connected to the main passage 60 via the first distribution passage 61, and oil is supplied from the main passage 60 via the first distribution passage 61.

[0079] 6 and 7, the cylindrical plate 81 has a cylindrical shape with a width in the axial direction. The axial width of the cylindrical plate 81 is greater than the axial width of the left motor coil end portion 11gL. Both axial end portions of the cylindrical plate 81 are located outside the left motor coil end portion 11gL. The cylindrical plate 81 is made of resin.

[0080] 7 and 8, one end of the cylindrical plate 81 in the cylindrical axis direction is formed with a plurality of (here, five) mounting portions 81a for mounting and fixing the cylindrical plate 81 to the first housing 110. Each mounting portion 81a is formed so as to protrude radially outward from the cylindrical plate 81. The mounting portions 81a are formed at intervals in the circumferential direction. The mounting portions 81a are arranged so that the intervals between adjacent mounting portions 81a in the circumferential direction are not equal, that is, at least one of the intervals between adjacent mounting portions 81a is different from the other intervals. This makes it easy to position the cylindrical plate 81 in the circumferential direction.

[0081] 7, each mounting portion 81a is attached and fixed to the first housing 110 with a bolt 85. Specifically, a vertical wall portion 114 that extends in a direction intersecting the axial direction is formed in the first housing 110 to the right of the first partition wall 111, and each mounting portion 81a is attached and fixed to the vertical wall portion 114 with a bolt 83. With each mounting portion 81a attached to the vertical wall portion 114, the bolt 83 is in a position extending in the axial direction.

[0082] 6 and 7, the surface of the first partition wall 111 facing the drive motor 11 (i.e., the right side) is provided with a ring-shaped protrusion 115 that protrudes toward the drive motor 11. This protrusion 115 forms a guide portion 116 for arranging the cylindrical plate 81 between the inner circumferential wall surface of the first housing 110 and the protrusion 115. This guide portion 116 makes it easy to arrange the cylindrical plate 81 along the outer periphery of the left motor coil end portion 11gL. Furthermore, even if a radially inward force is applied by the hydraulic pressure of the oil supplied to the annular oil passage 82, the protrusion 115 can prevent the cylindrical plate 81 from being deformed in the radial direction due to the force.

[0083] As shown in FIGS. 6, 8, and 10, three recesses 81b, 81c are formed on the surface of the cylindrical plate 81 over the entire circumference. Of the three recesses, the central first recess 81b is a portion that cooperates with the second housing 120 to form the annular oil passage 82. The first recess 81b is formed shifted toward the mounting portion 81a from the center in the width direction of the cylindrical plate 81. This allows the mounting portion 81a to more easily bear a radially inward force due to the oil pressure of the oil supplied to the annular oil passage 82. Second recesses 81c are formed on both sides of the first recess 81b in the axial direction of the cylinder. As shown in FIG. 6, the second recesses 81c are formed to have a smaller width than the first recess 81b.

[0084] 10 and 11, the first recess 81b is provided with a plurality of oil supply holes 81d. These oil supply holes 81d are holes for supplying oil from the annular oil passage 82 to the left motor coil end portion 11gL. The plurality of oil supply holes 81d are provided at intervals in the circumferential direction of the cylindrical plate 81. In the inner part of the cylindrical plate 81, the portion near each oil supply hole 81d forms a flat surface portion 81e. These flat surfaces 81e are provided so that pins for forming the oil supply holes 81d can be positioned along the radial direction when the cylindrical plate 81 is formed by die-cutting.

[0085] 11, when the cylindrical plate 81 is attached and fixed to the second housing 120, the annular oil passage 82 is connected to the third distribution passage 63 at its uppermost portion 82a. When viewed in the axial direction, the oil supply holes 81d are arranged in mirror symmetry with respect to a first line L1 that passes through the uppermost portion 82a and the center of the motor shaft 11c. Furthermore, there are more oil supply holes 81d in the lower portion of the cylindrical plate 81 than in the upper portion. Specifically, four oil supply holes 81d are provided in the upper portion of the cylindrical plate 81, and six oil supply holes 81d are provided in the lower portion.

[0086] As shown in FIGS. 6 and 7 , a first receptacle 84 is provided radially inward of the cylindrical plate 81 and above the motor shaft 11c to receive oil dripping from the upper portion of the left motor coil end 11gL. The first receptacle 84 extends in the front-to-rear direction and is arch-shaped with its center in the front-to-rear direction positioned higher than its front and rear ends. The front end of the first receptacle 84 is located forward of the motor shaft 11c, and its rear end is located rearward of the motor shaft 11c. The first receptacle 84 has multiple upright walls 84a. The upright walls 84a extend across the entire front-to-rear direction of the first receptacle 84. Although not shown, the front and rear ends of the first receptacle 84 are not provided with upright walls 84a and are open in the front-to-rear direction. The first receptacle 84 is fixed to the first partition wall 111 with bolts 85.

[0087] The oil supplied to the annular oil passage 82 branches from the top 82a in both the clockwise and counterclockwise directions. The oil is then sprayed from each oil supply hole 81d to the left motor coil end portion 11gL by the hydraulic pressure applied to the annular oil passage 82. This supplies cooling oil to the left motor coil end portion 11gL. By forming the annular oil passage 82 radially outward from the left motor coil end portion 11gL, oil can be supplied from a position radially outward from the outermost layer of the left motor coil end portion 11gL. The supplied oil spreads circumferentially and radially through gravity and capillary action in the upper portion of the left motor coil end portion 11gL, while it spreads circumferentially and radially through capillary action in the lower portion of the left motor coil end portion 11gL.

[0088] Furthermore, after being supplied to the upper portion of the left motor coil end portion 11gL, some of the oil that moves downward due to gravity and drips down is collected by the first receptacle portion 84. The oil collected in the first receptacle portion 84 moves in the front-to-rear direction along the first receptacle portion 84 and drips from the front and rear ends of the first receptacle portion 84 onto the lower portion of the left motor coil end portion 11gL. This allows oil to be appropriately supplied to the radially inner portion of the lower portion of the left motor coil end portion 11gL, which is difficult for oil to reach.

[0089] For these reasons, the entire left motor coil end portion 11gL can be appropriately cooled. In particular, even if the left motor coil end portion 11gL has a layered structure, oil can be appropriately supplied to each layer.

[0090] Next, with reference to FIGS. 12 and 13, a structure for supplying oil to the right motor coil end portion 11gR to which the motor lead wire 11h is connected will be described.

[0091] 12, 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 is formed in the right 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 covers the recess 132 from the axial direction, thereby forming a side oil passage 92 on the right side of the right motor coil end portion 11gR.

[0092] As shown in Fig. 13, the recess 132 has an annular shape formed along the circumferential direction of the right motor coil end portion 11gR when viewed in the axial direction. The recess 132 is formed facing the radially outermost layer of the right motor coil end portion 11gR that is layered in the radial direction. Because the recess 132 has an annular shape, the side oil passage 92 also has an annular shape. The recess 132 is formed by casting.

[0093] The recess 132 is connected at its uppermost portion to the first distribution passage 61. Specifically, as shown in Fig. 12, a horizontal hole 61a extends from the lower end of the first distribution passage 61 toward the left side, and the horizontal hole 61a communicates with the uppermost portion of the recess 132. As a result, the first distribution passage 61 is connected to the uppermost portion 92a of the side oil passage 92 (see Fig. 9) via the horizontal hole 61a.

[0094] 13, the plate member 91 has a width in the radial direction of the motor shaft 11c and is annular in 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.

[0095] 13, a plurality of (four in this example) mounting portions 91a for mounting and fixing the plate member 91 to the right end cover 130 are formed on the radially outer end of the plate member 91. Each mounting portion 91a is mounted and fixed to the right side wall portion 131 of the right end cover 130 with a bolt 93.

[0096] A plurality of oil supply holes 91b are provided in the plate member 91. These oil supply holes 91b are holes for supplying oil from the side 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.

[0097] When viewed in the axial direction, the oil supply holes 91b are arranged in mirror symmetry with respect to a second straight line L2 that passes through the uppermost part 92a of the side oil passage 92 and the center of the motor shaft 11c. Furthermore, there are more oil supply holes 91b provided in the lower portion than in the upper portion of the plate member 91. Specifically, four oil supply holes 91b are provided in the upper portion of the plate member 91, and six oil supply holes 91b are provided in the lower portion.

[0098] A liquid gasket is provided on the mating surface between the right side wall portion 131 and the plate member 91. This prevents oil from leaking from the side oil passage 92.

[0099] As shown in Figures 12 and 13, a second receptacle 94 is provided radially inward of the plate member 91 and above the motor shaft 11c to receive oil dripping from the upper portion of the right motor coil end 11gR. The second receptacle 94 extends in the front-to-rear direction and is arch-shaped with its center in the front-to-rear direction positioned higher than its front and rear ends. The front end of the second receptacle 94 is located forward of the motor shaft 11c, and its rear end is located rearward of the motor shaft 11c. The second receptacle 94 has multiple upright walls 94a. The upright walls 94a extend across the entire front-to-rear direction of the second receptacle 94. Although not shown, the front and rear ends of the second receptacle 94 are not provided with upright walls 94a and are open in the front-to-rear direction. The second receptacle 94 is fixed to the right side wall 131 with bolts 95.

[0100] The oil supplied to the side oil passage 92 branches from the top 92a to both the clockwise and counterclockwise sides. Then, due to the hydraulic pressure applied to the side oil passage 92, the oil is sprayed from the right side through each oil supply hole 91b onto the right motor coil end portion 11gR. Because the oil supply holes 91b are formed in both the upper and lower portions of the plate member 91, cooling oil is supplied from the right side to both the upper and lower portions of the right motor coil end portion 11gR. Because the side oil passage 92 faces the radially outermost layer of the right motor coil end portion 11gR, oil is supplied to the radially outermost layer. The supplied oil permeates the upper portion of the right motor coil end portion 11gR in the circumferential and radial directions due to gravity and capillary action, while permeating the lower portion of the right motor coil end portion 11gR in the circumferential and radial directions due to capillary action.

[0101] Furthermore, after being supplied to the upper portion of the right motor coil end portion 11gR, some of the oil that moves downward due to gravity and drips down is collected by the second receptacle portion 94. The oil collected in the second receptacle portion 94 moves in the front-to-rear direction along the second receptacle portion 94 and drips from the front and rear ends of the second receptacle portion 94 onto the lower portion of the right motor coil end portion 11gR. This allows oil to be appropriately supplied to the radially inner portion of the lower portion of the right motor coil end portion 11gR, which is difficult for oil to reach.

[0102] For these reasons, the right motor coil end portion 11gR can also be cooled appropriately as a whole. Furthermore, because the side oil passage 92 is formed on the right side of the right motor coil end portion 11gR, there is no need to consider the routing structure of the motor lead wire 11h. This also helps prevent deterioration of layout flexibility.

[0103] (summary) Therefore, according to this embodiment, a drive motor 11 having a motor shaft 11c, a motor rotor 11a fixed to the rotating shaft, and a motor stator 11b, a first housing 110 that accommodates the drive motor 11, and an oil supply system 5 that supplies oil to a left motor coil end portion 11gL of a coil wound around the motor stator 11b, the left motor coil end portion 11gL being located outside the motor rotor 11a in the axial direction of the motor shaft 11c, and Between the inner circumferential wall surface of the first housing 110 and the left motor coil end portion 11gL, a cylindrical plate 81 is provided along the outer periphery of the left motor coil end portion 11gL as viewed in the axial direction and has a width in the axial direction. The oil supply system 5 has an annular oil passage 82 formed by the inner circumferential wall surface of the first housing 110 and the cylindrical plate 81 in cooperation with each other, and a plurality of oil supply holes 81d provided circumferentially of the cylindrical plate 81 and supplying oil from the annular oil passage 82 to the left motor coil end portion 11gL. As a result, the annular oil passage 82 is provided along the outer periphery of the left motor coil end portion 11gL, and oil is supplied from the annular oil passage 82 to the left motor coil end portion 11gL via the plurality of oil supply holes 81d. As a result, oil can be supplied to the left motor coil end portion 11gL from the entire outer periphery of the left motor coil end portion 11gL, thereby efficiently cooling the left motor coil end portion 11gL.

[0104] Furthermore, in this embodiment, the annular oil passage 82 is composed of a first recess 81b that is formed on the outer peripheral surface of the cylindrical plate 81 and recessed radially inward, and the inner peripheral wall surface of the first housing 110. This eliminates the need to process the inner peripheral wall surface of the second housing 120 in order to form the annular oil passage 82. As a result, the annular oil passage 82 can be easily formed.

[0105] In this embodiment, the rotation shaft extends in the left-right direction, and the oil supply system 5 includes a main passage 60 formed above the cylindrical plate 74 within the wall of the drive unit housing 100 so as to extend in the axial direction, and a third distribution passage 63 that connects the uppermost portion 82a of the annular oil passage 82 to the main passage 60. This allows the oil supply path from the main passage 60 to the annular oil passage 82 to be as short as possible. Furthermore, communication between the uppermost portion 82a of the annular oil passage 82 and the main passage 60 facilitates oil distribution throughout the annular oil passage 82. As a result, hydraulic pressure can be easily applied throughout the annular oil passage 82, allowing oil to be appropriately supplied to the left motor coil end 11gL from each oil supply hole 81d, thereby more efficiently cooling the left motor coil end 11gL.

[0106] Furthermore, in this embodiment, the multiple oil supply holes 81d are arranged in mirror symmetry with respect to a first line L1 that passes through the center of the rotation shaft and the uppermost part 82a of the annular oil passage 82, as viewed in the axial direction. This reduces the likelihood of a difference in oil pressure between the clockwise and counterclockwise sides of the uppermost part 82a of the annular oil passage 82. As a result, variation in the amount of oil supplied is reduced, enabling more efficient cooling of the left motor coil end portion 11gL.

[0107] Furthermore, in this embodiment, the number of oil supply holes 81d is greater in the lower portion of the cylindrical plate 81 than in the upper portion. By forming more oil supply holes 81d in the lower portion of the cylindrical plate 81, where the oil pressure is likely to be low, than in the upper portion, where the oil pressure is relatively high, differences in the amount of oil supplied to the upper and lower portions of the left motor coil end portion 11gL are less likely to occur. This allows the left motor coil end portion 11gL to be cooled more efficiently.

[0108] Furthermore, in this embodiment, the axial width of the cylindrical plate 81 is larger than the axial width of the left motor coil end portion 11gL, the first housing 110 is provided with a vertical wall portion 114 that extends in a direction intersecting the axial direction, and one end of the cylindrical plate 81 in the cylindrical axis direction is provided with mounting portions 81a that protrude radially outward and are attached to the vertical wall portion 114, and each mounting portion 81a is attached to the vertical wall portion 114 with a bolt 83 extending in the axial direction. This allows the cylindrical plate 81 to be fitted into the first housing 110 from the axial direction of the rotating shaft and attached to the second housing 120 with the bolt 83. This makes it possible to easily attach the cylindrical plate 81 to the drive unit housing 100, and also prevents the cylindrical plate 81 from shifting, which would otherwise cause the annular oil passage 82 to shift, even if an axial load is input to the cylindrical plate 81.

[0109] In particular, in this embodiment, a plurality of mounting portions 81a are provided at intervals in the circumferential direction of the cylindrical plate 81, and at least one of the intervals between adjacent mounting portions 81a in the circumferential direction is arranged to be different from the other intervals. That is, as described above, in order to mount the cylindrical plate 81 to the first housing 110 so that the oil supply holes 81d are mirror-symmetrical and so that there are more oil supply holes 81d in the lower portion than in the upper portion, it is necessary to appropriately position the cylindrical plate 81 in the circumferential direction. With this configuration, the cylindrical plate 81 can be easily positioned in the circumferential direction using the portions with different intervals as a guide.

[0110] In this embodiment, a ring-shaped protrusion 115 that protrudes toward the drive motor 11 is provided on the surface of the first partition wall 111 of the first housing 110 facing the drive motor 11, and a guide portion 116 is formed between the inner circumferential wall surface of the first housing 110 and the protrusion 115 to guide the cylindrical plate 81 when positioning the cylindrical plate 81. This guide portion 116 makes it easy to position the cylindrical plate 81 along the outer periphery of the left motor coil end portion 11gL. Furthermore, even if a radially inward force is applied by the hydraulic pressure of the oil supplied to the annular oil passage 82, the protrusion 115 can prevent the cylindrical plate 81 from being deformed in the radial direction by the force.

[0111] As for the power generation coil 13g, the oil supply structure to the right power generation coil end 13gR, to which the power generation lead wire 13h is not connected, is configured so that the cylindrical plate 81 forms the annular oil passage 82, as described above. For the generator 13 portion, the cylindrical plate 81 cooperates with the inner circumferential wall surface of the second housing 120 to form the annular oil passage 82. The annular oil passage 82 on the generator 13 side is connected to the main passage 60 via a fifth distribution passage 65 provided in the second housing 120. The mounting portion 81a is provided on the left side of the right power generation coil end 13gR in the second housing 120, and is attached with bolts to a vertical wall portion extending in a direction intersecting the axial direction of the generator shaft 13c. The second partition wall 121 of the second housing 120 has a ring-shaped protrusion on its surface facing the generator 13, as viewed in the axial direction, and the protrusion and the inner circumferential wall surface of the second housing 120 form a guide portion. On the other hand, for the left power generating coil end 13gL to which the power generating lead wire 13h is connected, a ring-shaped side oil passage 92 is formed by the plate member 91 and a recess formed in the left end cover 140. The side 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 with a bolt.

[0112] (Other embodiments) The technology disclosed herein is not limited to the above-described embodiments, and can be substituted within the scope of the claims.

[0113] For example, in the above-described embodiment, the first recess 81b extending in the entire circumferential direction is formed only in the cylindrical plate 81. However, the present invention is not limited to this, and recesses extending in the entire circumferential direction may also be formed on the inner peripheral wall surface of the first housing 110 or the inner peripheral wall surface of the second housing 120. Furthermore, no recess may be formed in the cylindrical plate 81, and recesses may be formed only on the inner peripheral wall surface of the first housing 110 or the inner peripheral wall surface of the second housing 120 to form the annular oil passage 82.

[0114] The above-described embodiments are merely examples and should not be construed as limiting the scope of the present disclosure. The scope of the present disclosure is defined by the claims, and all modifications and variations that fall within the scope of the claims equivalents are within the scope of the present disclosure. [Industrial Applicability]

[0115] The technology disclosed herein is useful as a configuration for efficiently cooling the coil end portion in a rotating electrical machine. [Explanation of symbols]

[0116] 5 Supply system (oil supply section) 11 Drive motor (rotating electric machine body) 11a Motor rotor 11b Motor stator 11c Motor shaft (rotating shaft) 11g motor coil 11gL Left motor coil end 11gR Right motor coil end 13 Generator (rotating electric machine body) 13a Power generating rotor 13b Power generating stator 13c Generator shaft (rotating axis) 13g power generating coil 13gL Left generating coil end 13gR Right generator coil end 60 Main Passage 63 3rd distribution passage 65 5th distribution aisle 81 Cylindrical Plate 81a Mounting part 81d Oil supply hole 82 Annular oil passage 82a top 110 First Housing 113 Vertical wall section 120 Second Housing

Claims

1. A rotating electric machine, a rotating electrical machine body including a rotating shaft, a rotor fixed to the rotating shaft, and a stator positioned radially outward of the rotor from the rotating shaft; a housing that accommodates the rotating electrical machine body; an oil supply unit that supplies oil to a coil end portion of the coil wound around the stator, the coil end portion is located outside the rotor in the axial direction of the rotating shaft, a cylindrical plate that is provided along an outer periphery of the coil end portion as viewed in the axial direction and has a width in the axial direction is provided between an inner circumferential wall surface of the housing and the coil end portion in the radial direction, The oil supply unit an annular oil passage formed by the inner circumferential wall surface of the housing and the cylindrical plate in cooperation with each other; a plurality of oil supply holes provided in the circumferential direction of the cylindrical plate, the oil supply holes supplying oil from the annular oil passage to the coil end portion; and the axial width of the cylindrical plate is greater than the axial width of the coil end portion, The housing is provided with a vertical wall portion extending in a direction intersecting the axial direction, an attachment portion that protrudes radially outward and is attached to the vertical wall portion is provided at one end portion of the cylindrical plate in the cylindrical axis direction, The rotating electric machine according to claim 1, wherein the mounting portion is attached to the vertical wall portion by a shaft-shaped fastening member extending in the axial direction.

2. 2. The rotating electric machine according to claim 1, a recess formed on the outer peripheral surface of the cylindrical plate and recessed radially inward, the recessed annular oil passage being configured by an inner peripheral wall surface of the housing;

3. 3. The rotating electric machine according to claim 1, The rotation axis extends horizontally, The oil supply unit a main passage formed in a wall of the housing above the cylindrical plate and extending in the axial direction; a distribution passage that connects the uppermost portion of the annular oil passage with the main passage; A rotating electric machine further comprising:

4. 4. The rotating electric machine according to claim 3, The rotating electric machine according to claim 1, wherein the plurality of oil supply holes are arranged symmetrically with respect to a line passing through the uppermost portion and the center of the rotating shaft when viewed in the axial direction.

5. 5. The rotating electric machine according to claim 3, A rotating electric machine, characterized in that the plurality of oil supply holes are provided in greater numbers in a lower portion of the cylindrical plate than in an upper portion thereof.

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