Rotating electric machines

Abstract

To more reliably supply oil to a coil end .SOLUTION: A vehicular drive device comprises a drive motor 11, a generator 13, a housing 100, and a supply system 5. A coil end 11gL protrudes an axially outer side of a motor shaft 11c than a rotor 11a. The supply system 5 supplies oil to a first coil end part 11u which is defined by dividing the coil end 11gL into two portions, namely the first coil end part 11u on an upper side and a second coil end part 11l on a lower side. The vehicular drive device further comprises a first plate member 200, disposed between the motor shaft 11c and the first coil end part 11u, which receives oil that has dripped down from the coil end 11gL, and which also supplies oil to an inner circumferential portion 11i of the second coil end part 11l.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present disclosure relates to a rotating electric machine. [Background technology]

[0002] For example, Patent Document 1 discloses a cooling structure for an electric motor. The motor disclosed in this patent document includes a rotor, a stator having a stator core, a fixed ring, and a stator coil, coil ends protruding from the fixed ring, and an oil guide member covering roughly the upper half of the coil ends.

[0003] The oil guide member disclosed in Patent Document 1 is configured to guide cooling oil to the upper region of the coil end through its storage portion, and also to guide cooling oil from its guide portion to the lower half of the coil end using surface tension.

[0004] According to Patent Document 1, the cooling oil guided to the upper region of the coil end flows out from the opening of the cooling pipe into a storage section, where it is temporarily stored before dripping into the upper region through a drip hole, or is further guided from the storage section to the induction section. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-078148 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the configuration utilizing surface tension as disclosed in Patent Document 1 lacks reliability in supplying oil, and there is room for improvement in terms of more reliable oil supply.

[0007] The technology disclosed herein has been made in consideration of the above points, and its purpose is to more reliably supply oil to the coil ends. [Means for solving the problem]

[0008] A first aspect of the present disclosure relates to a rotating electric machine including a rotating electric machine main body having 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 electric machine main body, and an oil supply unit that supplies oil to coil ends of a coil wound around the stator, the coil ends protruding axially outward from the rotating shaft beyond the rotor, and the oil supply unit supplies oil to the first coil end portion when the coil ends are divided into two portions: a first coil end portion above the rotating shaft and a second coil end portion below the rotating shaft.

[0009] According to a first aspect of the present disclosure, the rotating electric machine further includes a plate member disposed between the rotating shaft and the first coil end portion, which receives oil dripping from the coil end and supplies oil to the inner periphery of the second coil end portion, the plate member extending circumferentially around the first coil end portion, and the plate member configured so that both radial ends of the rotating shaft are contained within a range connecting both longitudinal ends of the plate member.

[0010] Furthermore, according to the first aspect, boss portions for fastening the plate member to the housing are provided below both longitudinal ends of the plate member, and the boss portions are provided with flange portions that protrude toward the inner periphery of the coil end.

[0011] According to the first aspect, the provision of the plate member allows oil supplied to the first coil end portion to be more reliably supplied to the inner periphery of the second coil end portion. Also, by extending both ends of the plate member to the outside of both radial ends of the rotating shaft, oil can be supplied to the inner periphery of the second coil end portion more reliably and efficiently than before, without being obstructed by the rotating shaft.

[0012] Furthermore, according to the first aspect, oil that flows downward from both ends of the plate member can be guided along the flanges to the inner periphery of the coil end, thereby ensuring a reliable and efficient supply of oil to the inner periphery of the second coil end.

[0013] Furthermore, according to a second aspect of the present disclosure, the plate member may have a dam portion that suppresses oil leakage in the axial direction of the rotating shaft, and the dam portion may be configured to extend along the longitudinal direction and rise upward from the upper surface of the plate member.

[0014] According to the second aspect, by providing a dam portion on the upper surface of the plate member, it is possible to suppress the outflow of oil in the axial direction, thereby suppressing the supply of oil to the rotating shaft and ensuring that oil is supplied reliably and efficiently to the inner periphery of the second coil end portion.

[0015] According to a third aspect of the present disclosure, the upper surface of the plate member may be configured so that the central portion in the longitudinal direction is higher than both end portions in the longitudinal direction.

[0016] According to the third aspect, oil dripping onto the upper surface of the plate member flows down from both ends due to gravity, thereby ensuring a reliable and efficient supply of oil to the inner periphery of the second coil end portion.

[0017] Furthermore, according to a fourth aspect of the present disclosure, the upper surface of the plate member may be curved in an arc shape along the inner periphery of the coil end so that both longitudinal end portions are each directed toward the inner periphery of the coil end.

[0018] According to the fourth aspect, oil flows due to gravity from both ends of the plate member toward the inner periphery of the coil end, thereby ensuring a reliable and efficient supply of oil to the inner periphery of the second coil end.

[0019] Furthermore, according to a fifth aspect of the present disclosure, a flow path may be provided on the upper surface of the plate member, the flow path being partitioned by the dam portion and having both longitudinal ends open, and the flow path may be configured so that both longitudinal ends are narrower than the central portion in the longitudinal direction.

[0020] According to the fifth aspect, by narrowing the width toward both ends, the flow rate of oil flowing out from both ends can be increased, thereby enabling oil to be reliably and efficiently supplied to the inner periphery of the second coil end portion. 。

[0021] Ma In addition, the first 6 According to this aspect, the flange portion may have a tip portion extending from the boss portion toward the inner periphery of the coil end, and the tip portion may be positioned so as to be spaced apart from the wall surface of the housing.

[0022] The above 6 According to this aspect, by separating the tip end portion from the wall surface of the housing, it is possible to suppress the occurrence of oil flowing down the wall surface, thereby ensuring a reliable and efficient supply of oil to the inner periphery of the second coil end portion.

[0023] In addition, the first aspect of the present disclosure 7 According to this aspect, a bearing for the rotating shaft may be arranged below the plate member, and a recess may be formed in the longitudinal center of the upper surface of the plate member, extending radially along the rotating shaft and recessed toward the bearing.

[0024] The above 7 According to this aspect, by providing a recess in the plate member, oil can be guided to the bearing through the recess, which makes it possible to supply oil to the bearing as well as to the inner periphery of the second coil end portion. [Effects of the Invention]

[0025] As described above, according to the present disclosure, oil can be more reliably supplied to the coil ends. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 1 shows a block diagram of a vehicle drive device. [Figure 2] FIG. 2 shows a plan view of the front of the vehicle. [Figure 3] FIG. 3 shows a front view of the vehicle drive device. [Figure 4] FIG. 4 shows a cross section taken along line IV-IV in FIG. [Figure 5] FIG. 5 shows a cross section taken along line VV of FIG. [Figure 6] FIG. 6 is a perspective view illustrating the peripheral structure of the first plate member. [Figure 7] FIG. 7 shows a cross section taken along line XI-XI of FIG. 5 as viewed from the front. [Figure 8] FIG. 8 shows a perspective view of the first plate member. [Figure 9] FIG. 9 shows a plan view of the first plate member. [Figure 10] FIG. 10 is a perspective view illustrating the periphery of the boss portion of the first plate member. [Figure 11] FIG. 11 is a perspective view schematically illustrating the peripheral structure of the second plate member. DETAILED DESCRIPTION OF THE INVENTION

[0027] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a vehicle drive device will be described with reference to the drawings. Note that the following description is an example.

[0028] (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.

[0029] 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.

[0030] 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.

[0031] The engine E is connected to a generator 13. The engine E drives the generator 13 so that the generator 13 generates electricity. 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 92 (front wheels in this case) via a differential device 91.

[0032] 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.

[0033] (Drive unit mounting structure on vehicle) FIG. 2 shows a plan view of the front of vehicle 1 as seen from above. 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. Here, the left side when looking at the front from the rear of the vehicle is referred to as left, and the right side is referred to as right. The left and right directions are also the vehicle width direction. The up and down direction is also the vehicle height direction, which is also referred to as the height direction.

[0034] The drive unit P is disposed in a power unit room 2 formed in 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 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.

[0035] 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.

[0036] 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.

[0037] 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, left end cover 140, and right end cover 130 are joined by bolts at flanges provided on the left and right ends.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] The drive motor 11 is housed in a first chamber 101 separated by the right end cover 130 and the partition wall 111 of the first housing 110. The generator 13 is housed in a third chamber 103 separated by the 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 partition wall 111 and the partition wall 121.

[0042] (Each element of the electric drive unit) (Drive motor) The drive motor 11 includes a motor rotor 11a, a motor stator 11b, and a motor shaft 11c. A rotating magnetic field is generated by supplying a three-phase AC current to the motor stator 11b, and the motor rotor 11a and the motor shaft 11c are rotated by the rotating magnetic field.

[0043] 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 is fixed to a motor shaft 11c. The motor rotor 11a and the motor shaft 11c rotate together.

[0044] 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 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. A first boss 122 formed integrally with the partition wall 121 holds the second bearing 11e. The first boss 122 protrudes rightward from the partition wall 121 into the second chamber 102.

[0045] The motor stator 11b surrounds the motor rotor 11a (is disposed around the motor rotor 11a). The motor stator 11b has a motor coil 11g. The motor stator 11b is held by the first housing 110 and the right end cover 130. The motor coil 11g is wound around the motor stator 11b.

[0046] The left and right motor coil ends 11gL and 11gR of the motor coil 11g are located on the outer side of the motor rotor 11a in the axial direction of the motor shaft 11c. The left and right motor coil ends 11gL and 11gR form a layered structure in the radial direction.

[0047] (generator) The generator 13 includes a power generation rotor 13a, a power generation stator 13b, and a generator shaft 13c. When the generator shaft 13c and the power generation rotor 13a are rotated by the power of the engine E, the power generation stator 13b generates electricity due to electromagnetic induction.

[0048] 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 is fixed to a generator shaft 13c. The power generation rotor 13a and the generator shaft 13c rotate together.

[0049] The generator shaft 13c extends in the left-right direction. In this configuration example, the generator shaft 13c and the motor shaft 11c are positioned coaxially. However, the generator shaft 13c and the motor shaft 11c may be misaligned. The third bearing 13d rotatably supports the left end of the generator shaft 13c. A second boss portion 123 formed integrally with the partition wall 121 holds the third bearing 13d. The second boss portion 123 protrudes rightward from the second partition wall 121 into the third chamber 103. The right end of the generator shaft 13c and the left end of the motor shaft 11c face each other with a gap in between at a position corresponding to the partition wall 121.

[0050] The left end of the generator shaft 13c passes through the left end cover 140 and extends leftward. The left end of 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.

[0051] The power generation stator 13b surrounds the power generation rotor 13a (is disposed around the power generation rotor 13a). The power generation stator 13b has a power generation coil 11g. The power generation stator 13b is held in a second housing 120. The power generation coil 11g is wound around the power generation stator 13b.

[0052] The left and right ends of the power generation coil 11g, that is, the left power generation coil end 13gL and the right power generation coil end 13gR, are located outside the power generation rotor 13a in the axial direction of the generator shaft 13c. The left and right coil ends 13gL, 13gR form a layered structure in the radial direction.

[0053] The outer diameter of the drive motor 11 is the same as that of the generator 13. More specifically, the outer diameter of the motor rotor 11a of the drive motor 11 is the same as that of the power-generating rotor 13a of the generator 13, and the outer diameter of the motor stator 11b of the drive motor 11 is the same as that of the power-generating stator 13b of the generator 13. The motor shaft 11c and the generator shaft 13c are positioned coaxially. The outer peripheral shapes of the front sides of the first housing 110 and the second housing 120 are arc-shaped and of the same size so that the drive motor 11 and the generator 13, which have the same outer diameter, can be accommodated (see FIG. 4).

[0054] (reducer) 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.

[0055] The reducer 12 is connected to the motor shaft 11c. 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] The second shaft 12e is connected to a drive shaft 93 via a differential device 91. As shown in FIG. 2, the drive shaft 93 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 91.

[0060] (oil supply section) 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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 first housing 110. 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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 11gR of the drive motor 11 and the first bearing 11d.

[0072] 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.

[0073] 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 11gL of the drive motor 11.

[0074] The fourth distribution passage 64 is formed in the second partition wall 121 of the second housing 120. 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.

[0075] The fifth distribution passage 65 is formed on the left side of the second partition wall 121 of the second housing 120. The fifth distribution passage 65 mainly supplies oil to the right generating coil end 13gR of the generator 13.

[0076] The sixth distribution passage 66 is formed in the middle between the left and right sides of the second housing 120. The sixth distribution passage 66 mainly supplies oil to the power generation stator 13b of the generator 13.

[0077] 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 13gL of the generator 13.

[0078] 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.

[0079] A communication hole 681 is formed in the middle of the supply passage 68. The communication hole 681 opens leftward on the left surface of the first partition wall 111. The second oil pipe 72 is connected to the communication hole 681.

[0080] 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.

[0081] (Oil supply related configuration) Here, the motor coil 11g and the power generation coil 11g are cooled by supplying oil to the motor coil ends 11gL, 11gR and the power generation coil ends 13gL, 13gR. If the motor coil 11g and the power generation coil 11g are not cooled sufficiently, a temperature distribution will occur in each of the motor coils 11g, 13g, resulting in increased heat loss in the drive motor 11 and reduced power generation efficiency of the generator 13. Conventionally, each of the coil ends 11gL, 11gR, 13gL, and 13gR has been cooled by supplying oil from the radial outside of each of the coil ends 11gL, 11gR, 13gL, and 13gR.

[0082] In contrast, in this embodiment, an ingenious oil supply structure is employed for the left motor coil end 11gL and the right power generation coil end 13gR. The oil supply structure for the left motor coil end 11gL will be described below. The supply structure for the right power generation coil end 13gR is basically the same as the supply structure for the left motor coil end 11gL, so details 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.

[0083] (First plate member) As described above, oil is supplied to the left motor coil end 11gL of the drive motor 11 through the third distribution passage 63. Here, as shown in Figure 7, the third distribution passage 63 extends downward from a position above the left motor coil end 11gL.

[0084] Therefore, if the left motor coil end 11gL is divided into two parts (more specifically, divided into two parts along a straight line L2 that passes through the center of the motor shaft 11c and extends horizontally) into a first coil end part 11u that is above the motor shaft 11c as the rotation axis, and a second coil end part 11l that is below the motor shaft 11c, the third distribution passage 63 will supply oil to the first coil end part 11u.

[0085] The oil supplied to the first coil end portion 11u flows circumferentially through the interior of the first coil end portion 11u and eventually through the interior of the second coil end portion 11l, and at least a portion of the oil drips down from the inner surface of the first coil end portion 11u due to gravity.

[0086] The oil that drips down is caught by the first plate member 200, which serves as the plate member in this embodiment. As shown in Fig. 7, this first plate member 200 is disposed between the motor shaft 11c and the first coil end portion 11u, and is configured to catch the oil that drips down from the left motor coil end 11gL and to supply the oil to the inner circumferential portion 11i of the second coil end portion 11l.

[0087] Specifically, the first plate member 200 in this embodiment is positioned on the straight line L1 connecting the third distribution passage 63 and the motor shaft 11c, and is positioned so that its upper surface faces the inner surface of the first coil end portion 11u.

[0088] As shown in FIG. 7, the first plate member 200 extends in the circumferential direction of the left motor coil end 11gL and is formed in a generally rectangular plate shape with the circumferential direction as its longitudinal direction. This longitudinal direction may extend along the front-rear direction, or may be along a line L2 that is perpendicular to a line L1 connecting the third distribution passage 63 and the motor shaft 11c. In this embodiment, these directions are the same. In this embodiment, the longitudinal center of the first plate member 200 (see line L3 in FIG. 9) is positioned so as to intersect with line L1.

[0089] When viewed along the longitudinal direction, the first plate member 200 according to this embodiment is configured so that both radial ends of the motor shaft 11c fit within a range R2 connecting both longitudinal ends. In other words, the length R2 of the first plate member 200 in the longitudinal direction is longer than the diameter R1 of the motor shaft 11c. In other words, both ends of the first plate member 200 extend to the outside of both radial ends of the motor shaft 11c.

[0090] 7 and 8, the upper surface 200a of the first plate member 200 is configured so that the longitudinal center portion is higher than the longitudinal ends. Specifically, the upper surface 200a is curved in an arc shape along the inner periphery 11i of the left motor coil end 11gL so that both longitudinal ends 200b, 200b are oriented toward the inner periphery 11i.

[0091] More specifically, both longitudinal end portions 200b, 200b each extend to point at a height position set higher than the boundary (straight line L2) between the first coil end portion 11u and the second coil end portion 11l.

[0092] In addition, a flow path F is defined on the upper surface 200a of the first plate member 200, with both ends open in the longitudinal direction, and is configured to send the oil received by the first plate member 200 to both sides in the longitudinal direction.

[0093] In detail, the first plate member 200 has dam portions 202, 203 that suppress oil leakage in the axial direction. These dam portions 202, 203 consist of a first dam portion 202 located on the lower side of the paper in Fig. 9 (the right side when viewed from the vehicle body) and a second dam portion 203 located on the upper side of the paper in Fig. 9 (the left side when viewed from the vehicle body). The first and second dam portions 202, 203 extend along the longitudinal direction and are configured to rise upward from the upper surface 200a of the first plate member 200. The upper surface 200a, the first dam portion 202, and the second dam portion 203 define the flow path F described above.

[0094] 9, the first dam portion 202 extends substantially parallel to the left-right direction, whereas the portions near the left and right ends of the second dam portion 203 extend at an angle relative to the left-right direction. As a result, the width of both ends of the flow path F in the longitudinal direction is narrower than that of the central portion in the longitudinal direction. Furthermore, these ends are curved with a larger curvature than the remaining portions.

[0095] Additionally, bosses 208 are provided below both end portions 200b of the first plate member 200 for fastening the first plate member 200 to the housing 100, particularly to the first partition wall 111. As shown in Figures 8 and 10, the left and right bosses 208 are each provided with flanges 209 that protrude toward the inner periphery 11i of the left motor coil end 11gL. The two flanges 209 are mirror images of each other with respect to the straight line L1, and therefore, the following description will focus on only one of the flanges 209 shown in Figure 10.

[0096] As shown in FIG. 10, the flange portion 209 has a base end portion 209a that is continuous with one end portion 200b of the first plate member 200, and a tip end portion 209b that is continuous with this base end portion 209a and extends toward the inner periphery 11i of the left motor coil end 11gL.

[0097] Of these, the upper surface of the base end 209a is continuous with the boss portion 208, and is designed to smoothly guide oil that flows down around the boss portion 208. Furthermore, as shown in FIG. 10 , the tip end 209b extends and protrudes while tapering toward the inner circumferential portion 11i of the left motor coil end 11gL. This tip end 209b is disposed with a gap in the axial direction from the wall surface of the first partition wall 111. This arrangement makes it possible to suppress the occurrence of oil flowing down the wall surface of the first partition wall 111.

[0098] 7, an injection nozzle 69 that injects oil supplied from the supply passage 68 is disposed between the first plate member 200 and the motor shaft 11c. The injection nozzle 69 according to this embodiment is disposed on the straight line L1 described above.

[0099] (Second plate member) Oil is supplied to the right generating coil end 13gR of the generator 13 through a fifth distribution passage 65. Although details are omitted, the fifth distribution passage 65 extends downward from a position above the right generating coil end 13gR.

[0100] Therefore, if the right generating coil end 13gR is divided into a first coil end portion that is above the generator shaft 13c as the rotating shaft, and a second coil end portion that is below the generator shaft 13c, the fifth distribution passage 65 supplies oil to the first coil end portion.

[0101] The oil supplied to the first coil end portion flows circumferentially through the interior of the first coil end portion and eventually the interior of the second coil end portion, and at least some of the oil drips down from the inner surface of the first coil end portion due to gravity.

[0102] The oil that drips down is caught by the second plate member 300, which serves as the other plate member in this embodiment. Similar to the first plate member 200, this second plate member 300 is disposed between the generator shaft 13c and the first coil end portion, and is configured to catch oil that drips down from the right generating coil end 13gR and to supply oil to the inner circumferential portion 11i of the second coil end portion.

[0103] Here, as shown in FIG. 5, a bearing (third bearing 13d) for the generator shaft 13c is disposed below the second plate member 300. In this case, as shown in FIG. 11, a recess 307 for guiding oil to the third bearing 13d may be provided on the upper surface of the second plate member 300. In the illustrated example, the recess 307 is formed in the longitudinal center of the upper surface of the second plate member 300. This recess 307 extends along the radial direction of the generator shaft 13c and is recessed toward the third bearing 13d. Providing the recess 307 makes it possible to supply oil to the third bearing 13d.

[0104] (Regarding efficient oil supply) As described above, according to this embodiment, by newly providing the first plate member 200 as shown in Fig. 7, oil supplied to the first coil end portion 11u can be more reliably supplied to the inner circumferential portion 11i of the second coil end portion 11l. Furthermore, by extending both ends of the first plate member 200 to the outside of both radial ends of the motor shaft 11c, oil can be reliably and efficiently supplied to the inner circumferential portion 11i of the second coil end portion 11l without being obstructed by the motor shaft 11c.

[0105] 8 and 9, the outflow of oil in the axial direction can be suppressed by providing first and second weir portions 202, 203 on the upper surface 200a of the first plate member 200. This suppresses the supply of oil to the motor shaft 11c, and ensures that oil is reliably and efficiently supplied to the inner circumferential portion 11i of the second coil end portion 11l.

[0106] 7, the longitudinal center of the upper surface 200a is formed relatively higher, so that oil dripping onto the upper surface 200a flows down from both ends due to gravity, thereby ensuring a reliable and efficient supply of oil to the inner circumferential portion 11i of the second coil end portion 11l.

[0107] 7 and other figures, by curving the upper surface 200a in an arc shape and orienting its tip toward the inner periphery 11i of the second coil end portion 11l, oil flowing due to gravity flows out from both ends of the first plate member 200 toward the inner periphery 11i of the coil end. This allows oil to be reliably and efficiently supplied to the inner periphery 11i of the second coil end portion 11l.

[0108] 9, by narrowing the width of the flow path F defined by the first plate member 200 toward both ends, the flow rate of oil flowing out from both ends can be increased, thereby ensuring reliable and efficient oil supply to the inner circumferential portion 11i of the second coil end portion 11l.

[0109] 10, the oil that flows downward from both ends of the first plate member 200 can be guided along the flanges 209 to the inner circumferential portions 11i of the coil ends. This allows oil to be reliably and efficiently supplied to the inner circumferential portions 11i of the second coil end portions 11l.

[0110] 10, by separating the tip end 209b of the flange 209 from the wall surface of the housing 100, it is possible to suppress the occurrence of oil flowing down the wall surface, thereby enabling oil to be reliably and efficiently supplied to the inner circumferential portion 11i of the second coil end portion 11l.

[0111] 11, by providing a recess 307 in the second plate member 300, it becomes possible to guide oil to the first bearing 11d through the recess 307. This makes it possible to supply oil to the first bearing 11d in addition to the inner circumferential portion 11i of the second coil end portion 11l. [Explanation of symbols]

[0112] 1 vehicle 5 Supply system (oil supply section) 11 Drive motor (rotating electric machine body) 11a Motor rotor (rotor) 11b Motor stator (stator) 11c Motor shaft (rotating shaft) 11d No. 1 bearing (bearing) 11g motor coil 11gL Left motor coil end (coil end) 11gR Right motor coil end (coil end) 11u 1st coil end 11l Second coil end 13 Generator (rotating electric machine body) 13a Power generating rotor (rotor) 13b Power generating stator (stator) 13c Generator shaft (rotating axis) 13g power generating coil 13gL Left generating coil end (coil end) 13gR Right generating coil end (coil end) 100 Housing 200 First plate member (plate member) 200a top 202 First weir (weir) 203 Second weir (weir) 208 Boss Department 209 Tsuba 300 Second plate member (plate member) 307 Recess F flow path

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 the coil ends of the coils wound around the stator, the coil ends protrude further outward in the axial direction of the rotary shaft than the rotor, the oil supply unit supplies oil to a first coil end portion when the coil end is divided into two portions: a first coil end portion that is on the upper side relative to the rotary shaft and a second coil end portion that is on the lower side relative to the rotary shaft; a plate member disposed between the rotating shaft and the first coil end portion, for receiving oil dripping from the coil end and supplying oil to an inner circumferential portion of the second coil end portion; the plate member extends along the circumferential direction of the first coil end portion, the plate member is configured so that both ends of the rotary shaft in the radial direction fit within a range connecting both ends of the plate member in the longitudinal direction, bosses for fastening the plate member to the housing are provided below both ends of the plate member in the longitudinal direction; The boss portion is provided with a flange portion that protrudes toward the inner periphery of the coil end. A rotating electric machine characterized by:

2. 2. The rotating electric machine according to claim 1, the plate member has a dam portion that suppresses oil leakage in the axial direction of the rotary shaft, The dam portion is configured to extend along the longitudinal direction and rise upward from the upper surface of the plate member. A rotating electric machine characterized by:

3. 3. The rotating electric machine according to claim 2, The upper surface of the plate member is configured so that the central portion in the longitudinal direction is higher than both end portions in the longitudinal direction. A rotating electric machine characterized by:

4. 4. The rotating electric machine according to claim 3, The upper surface of the plate member is curved in an arc shape along the inner periphery of the coil end so that both ends in the longitudinal direction are directed toward the inner periphery of the coil end. A rotating electric machine characterized by:

5. 5. The rotating electric machine according to claim 2, a flow path defined by the weir portion and having open ends in the longitudinal direction is provided on the upper surface of the plate member; The flow path is configured so that both ends in the longitudinal direction are narrower than the center portion in the longitudinal direction. A rotating electric machine characterized by:

6. 2. The rotating electric machine according to claim 1, the flange portion has a tip portion extending from the boss portion toward an inner circumferential portion of the coil end, The tip is disposed so as to be spaced apart from the wall surface of the housing. A rotating electric machine characterized by:

7. 7. The rotating electric machine according to claim 1, a bearing for the rotating shaft is disposed below the plate member; A recess extending along the radial direction of the rotary shaft and recessed toward the bearing is formed in the longitudinal center of the upper surface of the plate member. A rotating electric machine characterized by:

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