Rotating electric machines

Abstract

To more effectively use oil than prior arts.SOLUTION: A vehicular drive device comprises a drive motor 11, a generator 13, a housing 100, and a supply system 5. A coil end 11gR 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 11gR 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 plate member 400, disposed between the motor shaft 11c and the first coil end part 11u, which receives oil that has dripped down from the coil end 11gR, and which also guides oil to a first bearing 11d of the motor shaft 11c located under the first coil end part 11u.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 an oil-cooling structure for a rotating electric machine. The rotating electric machine disclosed in this patent document includes a shaft, a rotor, and a stator having a stator core and a stator coil. According to Patent Document 1, an oil passage hole for the stator coil is formed directly above the stator coil end, and oil dripping from the oil passage hole can be supplied to the stator coil end and the bearing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-050707 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the configuration described in Patent Document 1, some of the oil drips and is not effectively utilized, and in this respect there is room for improvement.

[0005] The technology disclosed herein has been made in view of the above points, and its purpose is to utilize oil more effectively than ever before. [Means for solving the problem]

[0006] 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 oil supply unit supplying oil to the first coil end portion when the coil ends are divided into a first coil end portion above the rotating shaft and a second coil end portion below the rotating shaft.

[0007] 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, for receiving oil dripping from the coil end and guiding the oil to a bearing of the rotating shaft located below the first coil end portion. The housing has a side wall portion to which the plate member is attached, and a bearing support portion is formed on the side wall portion to surround the bearing and support the bearing, the bearing support portion has a first notch portion cut out from the portion between the bearing and the plate member, and a sensor bracket mounting portion is provided around the bearing support portion, protruding from the side wall portion and capable of mounting a disk-shaped rotation sensor, and the sensor bracket mounting portion has a second notch portion cut out from the portion between the bearing and the plate member.

[0008] According to the first aspect, by providing the plate member, it becomes possible to use dripping oil to lubricate the bearing, thereby making it possible to use oil more effectively than before. Furthermore, by providing the first notch, the oil that flows out of the plate member is not hindered by the bearing support portion and can reach the bearing smoothly. This allows the oil to be used more effectively than before. Furthermore, by providing the second notch, the oil that flows out of the plate member is not hindered by the sensor bracket mounting portion and can reach the bearing smoothly. This allows the oil to be used more effectively than before.

[0009] Ma In addition, the first 2 According to this aspect, the bearing support portion and the sensor bracket mounting portion may be formed to be thicker in the axial direction of the rotating shaft than other portions of the side wall portion.

[0010] The above 2 According to this aspect, by forming the bearing support portion and the sensor bracket mounting portion to have a large thickness, it is possible to increase durability against loads caused by side collisions and the like.

[0011] In addition, the first aspect of the present disclosure 3According to this aspect, the plate member extends circumferentially around the first coil end portion, the plate member is configured so that both radial ends of the rotating shaft fit within a range connecting both longitudinal ends of the plate member, an oil guide portion that guides oil to the bearing is formed in the longitudinal center of the upper surface of the plate member, and the upper surface of the plate member is formed so that both longitudinal ends are each oriented toward the coil end.

[0012] The above 3 According to this aspect, 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.

[0013] In addition, the first aspect of the present disclosure 4 According to this aspect, a recess may be formed in the longitudinal center of the upper surface of the plate member, the recess extending along the radial direction of the rotating shaft and recessed toward the bearing.

[0014] The above 4 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 both the inner periphery of the second coil end portion and the bearing.

[0015] A fifth aspect of the present disclosure relates to a rotating electric machine, the rotating electric machine comprising: 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 accommodating 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 oil supply unit supplying oil to the first coil end portion when the coil end is divided into two portions, a first coil end portion above the rotating shaft and a second coil end portion below the rotating shaft, and a lubricating oil supply unit disposed between the rotating shaft and the first coil end portion that collects oil dripping from the coil end. The rotor further includes a plate member that receives a coil and guides oil to a bearing of the rotating shaft located below the first coil end portion, the plate member extending circumferentially along the first coil end portion, the plate member configured so that both radial ends of the rotating shaft fit within an area connecting both longitudinal ends of the plate member, an oil guide portion that guides oil to the bearing is formed in a longitudinal center portion of an upper surface of the plate member, the upper surface of the plate member is formed so that both longitudinal ends are oriented toward the coil end, and a recess that extends radially of the rotating shaft and is recessed toward the bearing is formed in the longitudinal center portion of the upper surface of the plate member.

[0016] According to the fifth aspect, by providing a plate member, it is possible to use dripping oil to lubricate the bearing. This allows for more effective use of oil than conventionally possible. Furthermore, 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 conventionally possible. Furthermore, by providing a recess in the plate member, oil can be guided to the bearing through the recess. This makes it possible to supply oil to both the inner periphery of the second coil end portion and the bearing.

[0017] A sixth aspect of the present disclosure relates to a rotating electric machine, the rotating electric machine comprising: 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 accommodating 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 oil supply unit supplying oil to the first coil end portion when the coil end is divided into a first coil end portion above the rotating shaft and a second coil end portion below the rotating shaft; and a plate member disposed between the rotating shaft and the first coil end portion for receiving oil dripping from the coil end and guiding the oil to a bearing of the rotating shaft located below the first coil end portion. the plate member extends circumferentially along the first coil end portion and is configured so that both radial ends of the rotating shaft fit within a range connecting both longitudinal ends of the plate member; an oil guide portion that guides oil to the bearing is formed in the longitudinal center of the upper surface of the plate member; the upper surface of the plate member is formed so that both longitudinal ends are directed toward the coil end; and a recess that extends radially of the rotating shaft and is recessed toward the bearing is formed in the longitudinal center of the upper surface of the plate member.

[0018] According to the sixth aspect, by providing a plate member, it is possible to use dripping oil to lubricate the bearing. This allows for more effective use of oil than in the past. Furthermore, by providing the first notch, the oil flowing out of the plate member is not impeded by the bearing support portion, and it reaches the bearing smoothly. This allows for more effective use of oil than in the past. Furthermore, 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 in the past. Furthermore, by providing a recess in the plate member, it becomes possible to guide oil to the bearing through the recess. This allows for both oil supply to the inner periphery of the second coil end portion and oil supply to the bearing.

[0019] Furthermore, according to a seventh aspect of the present disclosure, the upper surface of the plate member and the bottom surface of the recess may be connected to form a step via a vertical wall extending in a direction perpendicular to the upper surface and the bottom surface.

[0020] According to the seventh aspect, the step formed by the top surface and the bottom surface can cut off the flow of oil, thereby preventing oil from dripping and enabling more efficient oil supply. [Effects of the Invention]

[0021] As described above, according to the present disclosure, oil can be utilized more effectively than conventionally. [Brief explanation of the drawings]

[0022] [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 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 is an enlarged perspective view showing the peripheral structure of the plate member. [Figure 9] FIG. 9 shows a perspective view of the plate member. [Figure 10] FIG. 10 shows a plan view of the plate member. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, an embodiment of a vehicle drive device will be described with reference to the drawings. The following description is an example. In the following description, the front, rear, left, right, top, and bottom of the vehicle will be simply referred to as the front, rear, left, right, top, and bottom, respectively. Here, the left-right direction refers to the left side when looking at the front from the rear of the vehicle, and the right side refers to the right. The left-right direction is also the vehicle width direction. The up-down direction is also the vehicle height direction, which is also called the height direction.

[0024] (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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] (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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] (Each element of the electric drive unit) (Drive motor) The drive motor 11 includes a rotor 11a, a stator 11b, and a motor shaft 11c. A rotating magnetic field is generated when a three-phase alternating current is supplied to the stator 11b, and the rotor 11a and the motor shaft 11c are rotated by the rotating magnetic field.

[0039] The rotor 11a is located in the first chamber 101. The rotor 11a has a magnet and a magnetic body. The rotor 11a is fixed to a motor shaft 11c. The rotor 11a and the motor shaft 11c rotate together.

[0040] 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.

[0041] The stator 11b surrounds the rotor 11a (is disposed around the rotor 11a). The stator 11b has a coil 11g. The stator 11b is held by the first housing 110 and the right end cover 130. The coil 11g is wound around the stator 11b.

[0042] 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.

[0043] (generator) The generator 13 includes a rotor 13a, a generator stator 13b, and a generator shaft 13c. When the generator shaft 13c and the rotor 13a are rotated by the power of the engine E, the stator 13b generates electricity by electromagnetic induction.

[0044] The rotor 13a is located in the third chamber 103. The rotor 13a has a magnet and a magnetic body. The rotor 13a is fixed to a generator shaft 13c. The power-generating rotor 13a and the generator shaft 13c rotate together.

[0045] 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.

[0046] 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.

[0047] The stator 13b surrounds the rotor 13a (is disposed around the rotor 13a). The stator 13b has a coil 13g. The stator 13b is held in the second housing 120. The coil 13g is wound around the stator 13b.

[0048] The left and right ends of the power generating coil 13g, that is, the left power generating coil end 13gL and the right power generating coil end 13gR, are located outside the power generating rotor 13a in the axial direction of the generator shaft 13c. The left and right power generating coil ends 13gL, 13gR form a layered structure in the radial direction.

[0049] 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 rotor 11a of the drive motor 11 is the same as the outer diameter of the rotor 13a of the generator 13, and the outer diameter of the stator 11b of the drive motor 11 is the same as the outer diameter of the 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).

[0050] (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.

[0051] 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.

[0052] The first gear 12a rotates integrally with the first shaft 12d. The first shaft 12d is parallel to the motor shaft 11c. More specifically, the first shaft 12d extends in the left-right direction at a position rearward of the motor shaft 11c. The housing 100 rotatably supports the first shaft 12d.

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

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

[0055] 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.

[0056] (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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

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

[0065] 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.

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

[0067] 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.

[0068] 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 stator 11b of the drive motor 11.

[0069] 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.

[0070] 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 rotor 11a of the drive motor 11, the second bearing 11e, the third bearing 13d, and the rotor 13a of the generator 13 via the motor shaft 11c and the generator shaft 13c.

[0071] 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 coil end 13gR of the generator 13.

[0072] 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 stator 13b of the generator 13.

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

[0074] 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 rotor 11a of the drive motor 11. The supply passage 68 also supplies oil to the rotor 11a of the drive motor 11 and to the reducer 12.

[0075] 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.

[0076] 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.

[0077] (Details of the oil supply section) Here, the motor coil 11g and the power generation coil 13g 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 13g are not cooled sufficiently, a temperature distribution will occur in each coil 11g, 13g, resulting in increased heat loss in the drive motor 11 and reduced power generation efficiency of the generator 13. Conventionally, each coil end 11gL, 11gR, 13gL, 13gR has been cooled by supplying oil from the radial outside of each coil end 11gL, 11gR, 13gL, 13gR.

[0078] In contrast, in this embodiment, an ingenious oil supply structure is employed for the right motor coil end 11gR and the left power generation coil end 13gL. The oil supply structure for the left motor coil end 11gL will be described below. The supply structure for the left power generation coil end 13gL is basically the same as the supply structure for the right motor coil end 11gR, so details will be omitted with some exceptions. 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.

[0079] The right motor coil end 11gR and the left generator coil end 13gL are located at the right and left ends of the drive unit P, respectively. As explained with reference to FIG. 5, these right and left ends are blocked by the right end cover 130 and the left end cover 140, respectively. In this case, it is difficult to supply oil to the first bearing 11d and the fourth bearing 13e, which are located at both the left and right ends, using the oil passages provided inside the motor shaft 11c and the generator shaft 13c. One possible solution to this problem would be to position the first bearing 11d and the fourth bearing 13e on the axial outside, but this approach would result in an increase in the size of the drive unit P, which is inconvenient.

[0080] Therefore, in this embodiment, a new configuration is adopted in which the first bearing 11d and the fourth bearing 13e are lubricated by oil supplied to the right motor coil end 11gR and the left generator coil end 13gL, respectively.

[0081] Specifically, oil is supplied to the right motor coil end 11gR of the drive motor 11 through the first distribution passage 61. Here, as shown in Fig. 7, the third distribution passage 63 is disposed at approximately the same height as the upper end of the left motor coil end 11gL, and extends leftward from that height position.

[0082] Therefore, if the right motor coil end 11gR is bisected into a first coil end portion 11u that is above the motor shaft 11c as the rotation axis, and a second coil end portion 11l that is below the motor shaft 11c (more specifically, bisected along a straight line L2 that passes through the center of the motor shaft 11c and extends horizontally), the first distribution passage 61 will supply oil to the first coil end portion 11u.

[0083] 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.

[0084] The oil that drips down is caught by plate member 400, which serves as the plate member of this embodiment. As shown in Fig. 7, this plate member 400 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 right motor coil end 11gR and to guide the oil to the first bearing 11d of the motor shaft 11c, which is located below the first coil end portion 11u.

[0085] Specifically, the plate member 400 according to this embodiment is positioned on the straight line L1 connecting the first distribution passage 61 and the motor shaft 11c, and is positioned so that its upper surface faces the inner peripheral surface of the first coil end portion 11u.

[0086] As shown in Fig. 7, the plate member 400 extends along the circumferential direction of the right motor coil end 11gR and is formed in a generally rectangular plate shape with this 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 first distribution passage 61 and the motor shaft 11c. In this embodiment, these directions are the same. In this embodiment, the longitudinal center of the plate member 400 (see line L3 in Fig. 10) is positioned so as to intersect with line L1.

[0087] A flow path F is defined on the upper surface 400a of the plate member 400, with the longitudinal center portion being open, and is configured to send the oil received by the plate member 400 from the longitudinal center portion to the first bearing 11d.

[0088] Specifically, the plate member 400 has weir portions 402, 403 that suppress oil leakage in the axial direction. These weir portions 402, 403 consist of a first weir portion 402 located on the upper side of the paper in Fig. 10 (left side when viewed from the vehicle body) and a second weir portion 403 located on the lower side of the paper in Fig. 10 (right side when viewed from the vehicle body). The first and second weir portions 402, 403 extend along the longitudinal direction and are configured to rise upward from the upper surface 400a of the plate member 400. The upper surface 400a, the first weir portion 402, and the second weir portion 403 define the flow path F described above.

[0089] A recess 407 is formed in the longitudinal center of the upper surface 400a of the plate member 400, extending radially along the motor shaft 11c and recessed toward the first bearing 11d. This recess 407 has a bottom surface 407a, which is a portion of the upper surface 400a that is lower than the other portions, in the longitudinal center of the plate member 400, and a notch 407b, which is a cutout portion of the second dam portion 403 in the longitudinal center. As shown in FIG. 10 , the bottom surface 407a constituting the recess 407 is formed by recessing a localized region in the lateral direction, rather than by recessing the entire longitudinal center of the upper surface 400a. The recess 407 serves as an oil guide in this embodiment.

[0090] Furthermore, a bottom surface 407a of the recess 407 and an upper surface 400a of the plate member 400 are connected to form a step. In particular, in this embodiment, the bottom surface 407a and the upper surface 400a are connected via a vertical wall that extends substantially in the vertical direction.

[0091] 9, fastening portions 408 for attaching the plate member 400 to the right side wall portion 131 as shown in FIG. 6 and the like are arranged below both longitudinal end portions 400b, 400b of the plate member 400. The plate member 400 is fastened to the right side wall portion 131 via these fastening portions 408.

[0092] Furthermore, as shown in FIG. 8, the plate member 400 according to this embodiment is fastened so that there is a gap between the center portion of the second dam portion 403 (the portion having at least the recess 407) and the right side wall portion 131.

[0093] 6, a bearing support portion 138 that surrounds the outer periphery of the first bearing 11d and supports the first bearing 11d is formed on the right side wall portion 131. As shown in the figure, the bearing support portion 138 is formed by protruding a portion of the right side wall portion 131 near the first bearing 11d in the axial direction.

[0094] The bearing support portion 138 is provided with a first cutout portion 138a that is formed by cutting out a portion between the first bearing 11d and the plate member 400. Specifically, the first cutout portion 138a is disposed on the above-mentioned straight line L1, and is formed so as to penetrate the bearing support portion 138 along the radial direction.

[0095] By providing the first cutout portion 138a, the oil that flows down from the recessed portion 407 of the plate member 400 is not hindered by the bearing support portion 138 and can smoothly reach the first bearing 11d.

[0096] 8, a sensor bracket attachment portion 139 is provided around the bearing support portion 138 and protrudes from the right side wall portion 131. This sensor bracket attachment portion 139 is formed by protruding in the axial direction from a portion of the right side wall portion 131 that is positioned radially outward of the bearing support portion 138. The sensor bracket attachment portion 139 is configured so that a disk-shaped rotation sensor 500 can be attached thereto.

[0097] The sensor bracket mounting portion 139 is provided with a second cutout 139a that is formed by cutting out a portion between the first bearing 11d and the plate member 400. Specifically, the second cutout 139a is disposed on the above-mentioned straight line L1, and is formed so as to penetrate the sensor bracket mounting portion 139 along the radial direction. The second cutout 139a is wider than the first cutout 138a, and expands in diameter in an approximately tapered manner upward.

[0098] Furthermore, bearing support portion 138 and sensor bracket attachment portion 139 are formed to be thicker than the portions where first notch portion 138a and second notch portion 139a are provided and other portions of right side wall portion 131. This can increase durability against loads caused by side collisions and the like.

[0099] Furthermore, the flow path F defined by the plate member 400 is open at both ends in the longitudinal direction, so that oil received by the plate member 400 can be added to the center in the longitudinal direction and discharged from both ends.

[0100] 10, the first dam portion 402 extends substantially parallel to the left-right direction, whereas the left and right end portions of the second dam portion 403 extend at an angle relative to the left-right direction. As a result, the width of both longitudinal end portions of the flow path F is narrower than that of the central portion in the longitudinal direction. Furthermore, these end portions are curved with a larger curvature than the remaining portions.

[0101] Furthermore, when viewed along the longitudinal direction of the plate member 400, the plate member 400 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 of the plate member 400. In other words, the length R2 of the plate member 400 in the longitudinal direction is longer than the diameter R1 of the motor shaft 11c.

[0102] 7 and 9, the upper surface 400a of the plate member 400 is configured so that the longitudinal center portion is higher than both longitudinal ends. Specifically, the upper surface 400a is curved in an arc shape along the inner periphery 11i of the right motor coil end 11gR so that both longitudinal ends 400b, 400b are oriented toward the inner periphery 11i.

[0103] More specifically, both longitudinal end portions 400b, 400b 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.

[0104] (Effective use of oil) As described above, according to this embodiment, by newly providing the plate member 400 as shown in Fig. 7, it becomes possible to use dripping oil to lubricate the first bearing 11d. This allows oil to be used more effectively than before.

[0105] 6 and 8, by providing the first notch 138a in the bearing support portion 138, the oil flowing out from the plate member 400 can reach the first bearing 11d smoothly without being obstructed by the bearing support portion 138. This allows the oil to be used more effectively than before.

[0106] 6 and 8, by providing second notch 139a in sensor bracket mounting portion 139, oil flowing out of plate member 400 can reach first bearing 11d smoothly without being obstructed by sensor bracket mounting portion 139. This allows oil to be used more effectively than before.

[0107] Furthermore, as shown in FIG. 7, by extending both ends of the plate member 400 to the outside of both radial ends of the motor shaft 11c, oil can be reliably and efficiently supplied to the inner peripheral portion 11i of the second coil end portion 11l without being obstructed by the motor shaft 11c.

[0108] 9, by providing recess 407 in plate member 400, oil can be guided to first bearing 11d through recess 407. This makes it possible to supply oil to both inner circumferential portion 11i of second coil end portion 11l and first bearing 11d.

[0109] Furthermore, the flow of oil can be interrupted by the step formed by the upper surface 400a of the plate member 400 and the bottom surface 407a of the recess 407. This prevents oil from dripping, allowing for more efficient oil supply. [Explanation of symbols]

[0110] 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 131 Right side wall (side wall) 138 Bearing support part 138a First notch 139 Sensor bracket mounting part 139a Second notch 400 Plate member (Plate member) 400a top 402 First weir (weir) 403 2nd Weir (Weir) 407 Recess (oil guide) 408 Fastening part 500 Rotation Sensor F flow path P drive unit

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 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 guiding the oil to a bearing of the rotating shaft located below the first coil end portion; the housing has a side wall to which the plate member is attached; a bearing support portion that surrounds the bearing and supports the bearing is formed on the side wall portion; the bearing support portion has a first notch portion formed by cutting out a portion between the bearing and the plate member, a sensor bracket mounting portion provided around the bearing support portion, protruding from the side wall portion, and capable of mounting a disk-shaped rotation sensor; The sensor bracket mounting portion has a second notch formed by cutting out a portion between the bearing and the plate member. A rotating electric machine characterized by:

2. 2. The rotating electric machine according to claim 1, The bearing support portion and the sensor bracket mounting portion are formed to be thicker in the axial direction of the rotary shaft than other portions of the side wall portion. A rotating electric machine characterized by:

3. 3. The rotating electric machine according to claim 1, 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, an oil guide portion for guiding oil to the bearing is formed in the longitudinal center portion of the upper surface of the plate member; The upper surface of the plate member is formed so that both ends in the longitudinal direction are oriented toward the coil ends. A rotating electric machine characterized by:

4. 4. The rotating electric machine according to claim 3, 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:

5. 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 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 guiding the oil to a bearing of the rotating shaft located below the first 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, an oil guide portion for guiding oil to the bearing is formed in the longitudinal center portion of the upper surface of the plate member; an upper surface of the plate member is formed so that both ends in the longitudinal direction are oriented toward the coil ends, 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:

6. 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 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 guiding the oil to a bearing of the rotating shaft located below the first coil end portion; the housing has a side wall to which the plate member is attached; a bearing support portion that surrounds the bearing and supports the bearing is formed on the side wall portion; the bearing support portion has a first notch portion formed by cutting out a portion between the bearing and the plate member, 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, an oil guide portion for guiding oil to the bearing is formed in the longitudinal center portion of the upper surface of the plate member; an upper surface of the plate member is formed so that both ends in the longitudinal direction are oriented toward the coil ends, 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:

7. 7. The rotating electric machine according to claim 4, The top surface of the plate member and the bottom surface of the recess are connected to form a step via a vertical wall extending in a direction perpendicular to the top surface and the bottom surface. A rotating electric machine characterized by:

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