power transmission device

Abstract

To provide a power transmission device capable of using a bearing of a simple shape and improving work efficiency in an assembly work.SOLUTION: A power transmission device 10 includes: a first rotor 11 rotated by power from an engine ENG; a second rotor 12 having a through hole 22a to which the first rotor 11 is inserted; a clutch CL for connecting and disconnecting power transmission between the first rotor 11 and the second rotor 12; a case 20 for housing the first rotor 11, the second rotor 12 and the clutch CL; a first cover 21 mounted on the case 20 and rotatably supporting the first rotor 11 via a ball bearing 90; and a second cover 22 mounted on the case 20 at a clutch CL side with respect to the first cover 21 and rotatably supporting the second rotor 12 via a ball bearing 91.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a power transmission device. [Background technology]

[0002] Non-Patent Document 1 discloses a power transmission device that transmits power transmitted from an engine to drive wheels via an electric motor, a torque converter, and a speed change mechanism.

[0003] In the power transmission device of Non-Patent Document 1, a first support member that holds a bearing that rotatably supports a rotating body to which the rotor of the electric motor is attached, and a second support member that holds a bearing that rotatably supports an input shaft to which power is transmitted from the engine are bolted together to a cover. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] Dr. Matthias MAISCH, and two others, The 9GH-TRONIC plug-in hybrid transmission in the electrified powertrain from Mercedes-Benz, 16th International CTI Symposium Automotive Transmissions, HEV and EV Drives, Berlin Summary of the Invention [Problem to be solved by the invention]

[0005] In the power transmission device of Non-Patent Document 1, when assembling the electric motor portion, it is necessary to assemble the rotor and stator while maintaining an air gap between them so that they do not stick together due to magnetic force. Specifically, after placing one of the rotor and stator in the case, it is necessary to place the other of the rotor and stator in the case while maintaining the air gap. Therefore, when assembling the power transmission device of Non-Patent Document 1, after placing the rotor and stator in the case, the second support member and cover are attached to the case, and the first support member and second support member are fixed to the cover by tightening bolts from the outside of the cover.

[0006] However, in the power transmission device structure of Non-Patent Document 1, the first support member and the second support member are fixed integrally to the cover, resulting in a complex structure related to the bearings. Furthermore, in the power transmission device structure of Non-Patent Document 1, the positions of the holes through which the bolts of the first support member and the second support member are inserted must be adjusted from outside the cover during assembly. This makes the assembly of the power transmission device time-consuming, and there has been a demand for improved work efficiency.

[0007] The present invention has been made in view of the above problems, and has an object to provide a power transmission device that can use bearings with a simple shape and that can improve the work efficiency of assembly work. [Means for solving the problem]

[0008] According to one aspect of the present invention, there is provided a rotary machine comprising: a first rotary body that rotates by power from a drive source; a second rotary body having a through hole through which the first rotary body is inserted; a clutch mechanism that connects and disconnects power transmission between the first rotary body and the second rotary body; a case that houses the first rotary body, the second rotary body, and the clutch mechanism; a first wall portion that is attached to the case and rotatably supports the first rotary body via a bearing; and a second wall portion that is attached to the case and rotatably supports the first rotary body via a bearing. and Clutch mechanism Between and a second wall portion attached to the case and rotatably supporting the second rotating body via a bearing. [Effects of the Invention]

[0009] This allows the bearing to have a simple shape, and also simplifies the work of attaching the bearing, thereby improving the work efficiency of the assembly work of the power transmission device. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic diagram of a hybrid vehicle equipped with a power transmission device according to an embodiment of the present invention; [Figure 2] FIG. 2 is a cross-sectional view of a main part of the power transmission device. [Figure 3] 10A to 10C are diagrams for explaining an assembly procedure for the power transmission device. [Figure 4] 10A to 10C are diagrams for explaining an assembly procedure for the power transmission device. [Figure 5] 10A to 10C are diagrams for explaining an assembly procedure for the power transmission device. [Figure 6] 10A to 10C are diagrams for explaining an assembly procedure for the power transmission device. [Figure 7] 10A to 10C are diagrams for explaining an assembly procedure for the power transmission device. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0012] First, with reference to FIG. 1, a hybrid vehicle 100 equipped with a power transmission device 10 according to an embodiment of the present invention will be described.

[0013] Fig. 1 is a schematic configuration diagram of a hybrid vehicle 100. As shown in Fig. 1, the hybrid vehicle 100 includes an engine ENG, a rotating electric machine MG1 as an engine start motor, a power transmission device 10, a battery BAT as an electricity storage device, drive wheels DW, a mechanical oil pump MP, an electric oil pump EP, a hydraulic control circuit 1, and a controller 2 as a control device.

[0014] The engine ENG is a drive source that drives the drive wheels DW. The engine ENG is an internal combustion engine that uses gasoline or diesel as fuel. The driving force of the engine ENG is transmitted to the drive wheels DW via a power transmission device 10.

[0015] The rotating electric machine MG1 is a motor for starting the engine ENG. The rotating electric machine MG1 is provided downstream of the engine ENG in a power transmission path between the engine ENG and the drive wheels DW. Specifically, the rotating electric machine MG1 is provided between the engine ENG and the power transmission device 10. Furthermore, when the rotating electric machine MG1 is driven by the engine ENG or when regenerative control is being performed, the rotating electric machine MG1 functions as a generator. The electric energy generated by the rotating electric machine MG1 is charged into the battery BAT.

[0016] 1, the power transmission device 10 includes a clutch CL as a clutch mechanism, a rotating electric machine MG2 as a drive motor, a torque converter TC, and a transmission TM. The power transmission device 10 transmits the driving force of at least one of the engine ENG and the rotating electric machine MG2 to the drive wheels DW depending on the driving conditions.

[0017] The clutch CL is a dry multi-plate clutch mechanism. The clutch CL connects or disconnects the rotating shaft of the engine ENG and the rotating shaft of the rotating electric machine MG2, thereby connecting or disconnecting the transmission of power. As shown in FIG. 1 , the clutch CL is provided downstream of the engine ENG (downstream of the rotating electric machine MG1) in the power transmission path. Specifically, the clutch CL is provided in the power transmission path between a first rotor 11 that transmits the driving force of the engine ENG to the clutch CL and a second rotor 12 that outputs the driving force transmitted from the engine ENG from the clutch CL when the clutch CL is engaged. The clutch CL transmits or disconnects power between the first rotor 11 and the second rotor 12. When the clutch CL is engaged, i.e., when the rotating shaft of the engine ENG and the rotating shaft of the rotating electric machine MG2 are connected by the clutch CL, the driving force of the engine ENG is transmitted to the drive wheels DW via the torque converter TC and the transmission TM.

[0018] The rotating electric machine MG2 functions as a drive source for driving the drive wheels DW. The rotating electric machine MG2 generates a driving force for driving the drive wheels DW using at least one of the electric energy generated by the rotating electric machine MG1 and the electric energy stored in the battery BAT. As shown in FIG. 1 , the rotating electric machine MG2 is provided between the clutch CL and the torque converter TC in the power transmission path. The driving force of the rotating electric machine MG2 is transmitted to the drive wheels DW via the torque converter TC and the transmission TM. Furthermore, the rotating electric machine MG2 functions as a generator when it is driven by the engine ENG or when regenerative control is being performed.

[0019] The battery BAT is formed, for example, by a lithium-ion secondary battery. Instead of the battery BAT, a capacitor or the like may be provided as a power storage device. The battery BAT is charged with electrical energy generated when the rotating electric machine MG1 is driven by the engine ENG and electrical energy generated when the rotating electric machines MG1 and MG2 are regeneratively controlled. The battery BAT also supplies electrical energy for driving the rotating electric machines MG1 and MG2.

[0020] The torque converter TC amplifies the driving force (rotational torque) from the engine ENG or the rotating electric machine MG2 via oil as a fluid and transmits it to the transmission TM. The torque converter TC is provided between the rotating electric machine MG2 and the transmission TM in the power transmission path.

[0021] The torque converter TC has a lockup clutch LU. When the lockup clutch LU is engaged, it mechanically connects (directly couples) the rotating electric machine MG2 and the drive wheels DW (specifically, the transmission TM). When the lockup clutch LU is engaged, that is, when the rotating electric machine MG2 and the transmission TM are directly connected by the lockup clutch LU, it is possible to improve the efficiency of power transmission of the driving force of the engine ENG or the rotating electric machine MG2 to the drive wheels DW.

[0022] The transmission TM changes the speed of the driving force of the engine ENG and the rotary electric machine MG2 transmitted from the torque converter TC and transmits it to the drive wheels DW. The transmission TM is provided between the torque converter TC and the drive wheels DW in the power transmission path. The transmission TM may be a continuously variable transmission or a stepped transmission.

[0023] The mechanical oil pump MP is driven by the driving force of the engine ENG. The mechanical oil pump MP sucks hydraulic oil from an oil pan (not shown) and pumps (supplies) the hydraulic oil to the hydraulic control circuit 1.

[0024] The electric oil pump EP is powered by a battery BAT and driven by a pump drive motor PM. The electric oil pump EP pumps (supplies) hydraulic oil together with the mechanical oil pump MP or independently to the hydraulic control circuit 1. The electric oil pump EP supplies hydraulic oil to the hydraulic control circuit 1 based on a command from the controller 2 when the supply of hydraulic oil from the mechanical oil pump MP to the hydraulic control circuit 1 is stopped or insufficient.

[0025] The hydraulic control circuit 1 is composed of multiple flow paths and multiple hydraulic control valves. The hydraulic control circuit 1 adjusts the pressure of hydraulic oil supplied from the mechanical oil pump MP and the electric oil pump EP and supplies it to each part of the power transmission device 10. Specifically, the hydraulic control circuit 1 performs hydraulic control of the clutch CL, lock-up clutch LU, etc. based on commands from the controller 2.

[0026] The controller 2 controls the operation of the engine ENG, the rotating electric machine MG1, the clutch CL, the rotating electric machine MG2, the lock-up clutch LU, the transmission TM, etc. based on signals output from various sensors, etc. The controller 2 also controls the driving mode of the hybrid vehicle 100 by selecting one of the following: an electric driving mode in which the engine ENG is stopped and the clutch CL is released so that the vehicle travels using the driving force of the rotating electric machine MG2; a series hybrid driving mode in which the driving force of the engine ENG is used to cause the rotating electric machine MG1 to generate electricity and the clutch CL is released so that the vehicle travels using the driving force of the rotating electric machine MG2; and a parallel hybrid driving mode in which the clutch CL is engaged so that the vehicle travels using the driving force of the engine ENG and the rotating electric machine MG2.

[0027] Next, the specific structure of the power transmission device 10 will be described with reference to Fig. 2. Fig. 2 is a cross-sectional view of the main part of the power transmission device 10.

[0028] As shown in Fig. 2, the power transmission device 10 includes a case 20 that houses a first rotating body 11, a clutch CL, a second rotating body 12, a rotating electric machine MG2, and a torque converter TC. Although not shown in Fig. 2, a transmission TM is also housed in the case 20. In this embodiment, the case 20 is made up of a first case 20a and a second case 20b, but the case 20 may be formed from a single member.

[0029] A first cover 21 serving as a first wall portion and a second cover 22 serving as a second wall portion located closer to the clutch CL than the first cover 21 are provided inside the case 20. The first cover 21 and the second cover 22 are attached to the first case 20a and the second case 20b, respectively, by bolting.

[0030] The first cover 21 rotatably supports the first rotor 11 via a ball bearing 90. In this embodiment, the first rotor 11 is an input shaft to which the output rotation of the engine ENG is transmitted. The first cover 21 is attached to the first case 20a by bolting.

[0031] As shown in Fig. 2, a clutch hub 70 of the clutch CL is fixed by welding, bolting, or the like to an end of the first rotor 11 (hereinafter also referred to as the input shaft 11) on the torque converter TC side (opposite side to the engine ENG). The clutch hub 70 has a cylindrical portion 70a extending toward the torque converter TC side (opposite side to the engine ENG). A plurality of drive plates 81 of the clutch CL are attached to the outer periphery of the cylindrical portion 70a by spline connection so as to be axially movable.

[0032] As shown in Fig. 2, the second rotating body 12 (hereinafter also referred to as the rotor 12) is disposed coaxially with the input shaft 11. The rotor 12 rotates coaxially with the input shaft 11. The rotor 12 is composed of a first frame 13 and a second frame 14.

[0033] The first frame 13 has a first cylindrical portion 13a that is rotatably supported on the output shaft 43 via a needle bearing 94 as a bearing, a second cylindrical portion 13b that is provided radially outside the first cylindrical portion 13a, a connection portion 13c that connects the first cylindrical portion 13a and the second cylindrical portion 13b, and a power transmission portion 13d that is provided at the end of the second cylindrical portion 13b on the torque converter TC side and is connected to the pump impeller 40 of the torque converter TC.

[0034] The second frame 14 has a third cylindrical portion 14a that is rotatably supported on the second cover 22 via a ball bearing 91 as a bearing, a fourth cylindrical portion 14b that is provided radially outside the third cylindrical portion 14a, and a connecting portion 14c that connects the third cylindrical portion 14a and the fourth cylindrical portion 14b.

[0035] In this embodiment, the rotating drum unit 12a is formed by the second cylindrical portion 13b of the first frame 13 and the fourth cylindrical portion 14b of the second frame 14. The second cylindrical portion 13b forms the inner peripheral side of the rotating drum unit 12a, and the fourth cylindrical portion 14b forms the outer peripheral side. A rotor core 15 of the rotating electric machine MG2 is fixed to the outer peripheral portion of the rotating drum unit 12a, more specifically, to the outer peripheral surface of the fourth cylindrical portion 14b.

[0036] A clutch drum 71 that holds driven plates 82 of the clutch CL is attached to the rotor 12, specifically, to the connection portion 13c of the first frame 13. The clutch drum 71 is fixed to the connection portion 13c of the first frame 13 by welding, bolting, or the like. The clutch drum 71 has a cylindrical portion 71a that extends toward the engine ENG. A plurality of driven plates 82 of the clutch CL are attached to the inner periphery of the cylindrical portion 71a by spline connection so as to be axially movable.

[0037] 2, the stator 16 of the rotary electric machine MG2 is disposed coaxially with the rotor core 15 and fixed to the case 20. Specifically, the stator 16 is fixed to the case 20 on the radially outer side of the rotor core 15 such that the inner peripheral surface of the stator 16 faces the outer peripheral surface of the rotor core 15.

[0038] As shown in FIG. 2, the second cover 22 has a main body 23 fixed to the case 20 (second case 20b), and an actuator support 24 fixed to the main body 23 and supporting the actuator 30 for engaging the clutch CL. The actuator support 24 forms the inner circumferential side of the second cover 22, and the main body 23 forms the outer circumferential side. The main body 23 and the actuator support 24 are fixed together by, for example, bolts. Note that in this embodiment, the main body 23 and the actuator support 24 are formed as separate parts, but they may also be formed as a single part.

[0039] As shown in FIG. 2, the second cover 22 (actuator support portion 24) has a through hole 22a, into which the third cylindrical portion 14a of the second frame 14 is inserted. In this embodiment, a ball bearing 91 is provided as a bearing between the inner peripheral surface of the through hole 22a and the outer peripheral surface of the third cylindrical portion 14a. This allows the rotor 12 to be rotatably supported by the second cover 22. The ball bearing 91 is inserted from the engine ENG side between the inner peripheral surface of the through hole 22a and the outer peripheral surface of the third cylindrical portion 14a, and is prevented from coming off by a retaining ring engaged with either or one of the inner peripheral surface of the through hole 22a and the outer peripheral surface of the third cylindrical portion 14a.

[0040] 2, the input shaft 11 is inserted through a through hole 14e formed by the third cylindrical portion 14a. In this embodiment, a needle bearing 92 serving as a bearing is provided between the third cylindrical portion 14a and the input shaft 11. As a result, the input shaft 11 is supported by the second cover 22 via the needle bearing 92, the third cylindrical portion 14a, and the ball bearing 91. The needle bearing 92 may be fixed by press fitting, or may be fixed using a retaining ring or the like.

[0041] 2, the actuator 30 of this embodiment is a hydraulic actuator. The actuator 30 includes a piston case 31 fixed to the actuator support portion 24 of the second cover 22, and a piston 32 slidably inserted into the piston case 31.

[0042] In the actuator 30, when hydraulic oil is supplied from the hydraulic control circuit 1 to an oil chamber formed by the actuator support portion 24, the piston case 31, and the piston 32, the piston 32 moves toward the clutch CL and presses the piston arm 33 via a needle bearing 93 serving as a bearing. The piston arm 33 then moves toward the clutch CL while compressing a return spring 34 provided between the piston arm 33 and the second frame 14. As a result, the drive plate 81 and the driven plate 82 of the clutch CL are pressed into contact with each other, and the clutch CL enters an engaged state. The needle bearing 93 prevents the piston 32 from rotating in conjunction with the rotation of the piston arm 33.

[0043] When the clutch CL is engaged, the driving force transmitted from the engine ENG to the input shaft 11 is output from the rotor 12. In other words, power is transmitted between the input shaft 11 and the rotor 12.

[0044] The power output from the rotor 12 is transmitted to the torque converter TC from the power transmission portion 13d of the first frame 13. The power transmitted to the torque converter TC is further transmitted to the transmission TM.

[0045] In contrast, when hydraulic oil is discharged from the oil chamber formed by the actuator support portion 24, the piston case 31, and the piston 32, the biasing force of the return spring 34 moves the piston arm 33 in a direction away from the drive plate 81 and the driven plate 82. This releases the drive plate 81 and the driven plate 82 from their pressed state, thereby releasing the clutch CL.

[0046] When the clutch CL is in a disengaged state, the driving force transmitted from the engine ENG to the input shaft 11 is not transmitted to the rotor 12. In other words, the transmission of power between the input shaft 11 and the rotor 12 is interrupted.

[0047] Next, a specific configuration of the torque converter TC will be described.

[0048] As shown in Figure 2, the torque converter TC has a pump impeller 40 connected to the power transmission section 13d of the first frame 13, a turbine liner 41 arranged opposite the pump impeller 40, a stator 42 arranged between the pump impeller 40 and the turbine liner 41, an output shaft 43 connected to the turbine liner 41, and a lock-up clutch LU.

[0049] The end of the output shaft 43 on the engine ENG side extends into the first cylindrical portion 13a of the first frame 13. A needle bearing 94 is provided between the first cylindrical portion 13a and the output shaft 43 as a bearing that receives a radial load.

[0050] The lock-up clutch LU comprises a plurality of drive plates 51 movably attached to the first frame 13 of the rotor 12 in the axial direction, a clutch hub 50 fixed to the turbine liner 41, and a plurality of driven plates 52 movably attached to the clutch hub 50 in the axial direction.

[0051] The clutch hub 50 has a cylindrical portion 50a extending toward the engine ENG. The outer peripheral surface of the cylindrical portion 50a faces the inner peripheral surface of the second cylindrical portion 13b at the end portion on the torque converter TC side. A plurality of driven plates 52 are attached to the outer peripheral portion of the cylindrical portion 50a by spline connection so as to be movable in the axial direction.

[0052] The drive plate 51 is attached to the inner periphery of the second cylindrical portion 13b at the end on the torque converter TC side by a spline connection so as to be axially movable. The rotor 12 of this embodiment also functions as a clutch drum of the lock-up clutch LU.

[0053] Next, an example of an assembly procedure for the power transmission device 10 of this embodiment will be described with reference to FIGS.

[0054] First, the clutch drum 71 is attached to the first frame 13. Then, with the drive plates 51 and driven plates 52 alternately arranged in the axial direction on the clutch hub 50, the first frame 13 is attached to the pump impeller 40 of the torque converter TC. At this time, a needle bearing 94 is disposed between the first frame 13 and the output shaft 43. The integrated clutch drum 71, first frame 13, and torque converter TC are then disposed inside the case 20 (see FIG. 3).

[0055] Next, the drive plates 81 and driven plates 82 of the clutch CL are arranged alternately in the axial direction, and the input shaft 11 to which the clutch hub 70 is attached is placed inside the case 20 (see FIG. 4).

[0056] Then, the second frame 14 to which the rotor core 15 is attached is placed inside the case 20, and the second frame 14 is fixed to the first frame 13 (see FIG. 5).

[0057] Next, the stator 16 is placed in the case 20 and fixed to the case 20 (see FIG. 6). At this time, the stator 16 is placed in the case 20 so as not to come into contact with the rotor core 15, in other words, while ensuring an air gap.

[0058] Next, the main body 23 of the second cover 22 is fixed to the second case 20b with bolts. Next, the actuator support part 24 incorporating the actuator 30 is fixed to the main body part 23 with bolts. After that, a ball bearing 91 is inserted between the inner peripheral surface of the actuator support part 24 (through hole 22a) and the outer peripheral surface of the third cylindrical part 14a of the second frame 14, and a retaining ring is engaged (see FIG. 7).

[0059] Finally, a ball bearing 90 is placed on the outer periphery of the input shaft 11, and the first case 20a to which the first cover 21 is attached is fixed to the second case 20b with bolts to complete the assembly (the state shown in FIG. 2).

[0060] The power transmission device 10 of this embodiment includes a first cover 21 that rotatably supports the input shaft 11 via a ball bearing 90, and a second cover 22 that rotatably supports the rotor 12 via a ball bearing 91. In other words, in the power transmission device 10, the ball bearings 90 and 91 are supported in separate locations. Therefore, it is not necessary to mount the ball bearings 90 and 91 integrally, and it is not necessary to prepare support members with complex shapes for mounting the ball bearings 90 and 91. In other words, according to the power transmission device 10 of this embodiment, bearings of ordinary shapes such as the ball bearings 90 and 91 can be used as bearings.

[0061] Furthermore, according to the power transmission device 10, the ball bearings 90 and 91 can be attached more easily than when two bearings are attached integrally, thereby improving the efficiency of the assembly work of the power transmission device 10.

[0062] In the above embodiment, the driving source is the engine ENG, but the present invention is not limited to this, and the driving source may be, for example, a motor, etc. In addition, in the above embodiment, the second rotating body 12 functions as a rotor of the rotating electric machine MG2, but the present invention is not limited to this, and the second rotating body 12 may be directly connected to the torque converter TC or the transmission TM, for example.

[0063] Furthermore, in the above embodiment, the actuator 30 is a hydraulic actuator, but the present invention is not limited to this, and the actuator 30 may be an actuator of another drive type, such as an electric actuator.

[0064] The main effects of the power transmission device 10 configured as above will now be described.

[0065] (1) The power transmission device 10 includes a first rotor 11 (input shaft 11) that rotates by power from an engine ENG (drive source), and a through hole through which the first rotor 11 (input shaft 11) is inserted. 14e a second rotating body 12 (rotor 12) having a first cover 21 (first wall portion) attached to the case 20 and rotatably supporting the first rotating body 11 (input shaft 11) via a ball bearing 90 (bearing), and a second cover 22 (second wall portion) attached to the case 20 at the clutch CL (clutch mechanism) via the first cover 21 (first wall portion) and rotatably supporting the second rotating body 12 (rotor 12) via a ball bearing 91 (bearing).

[0066] According to this configuration, there is no need to attach the ball bearing 90 (bearing) and the ball bearing 91 (bearing) together, and therefore there is no need to prepare a support member with a complex shape to support the ball bearing 90 (bearing) and the ball bearing 91 (bearing). In other words, bearings with a simple shape can be used as the ball bearing 90 (bearing) and the ball bearing 91 (bearing), and the work efficiency of the assembly work can be improved.

[0067] Furthermore, with this configuration, ball bearing 90 (bearing) and ball bearing 91 (bearing) can be attached more easily than when two bearings are attached integrally, thereby improving the efficiency of the assembly work of power transmission device 10.

[0068] (2) The power transmission device 10 further includes a rotating electric machine MG2 that generates a driving force that rotates the second rotating body 12 (rotor 12). A rotor core 15 of the rotating electric machine MG2 is attached to the second rotating body 12 (rotor 12).

[0069] According to this configuration, when the second rotating body 12 (rotor 12) functions as the rotor of the rotating electric machine MG2, the rotor core 15 and the stator 16 are assembled while maintaining an air gap therebetween so that they do not stick together due to magnetic force. can.

[0070] (3) In the power transmission device 10, the actuator 30 that controls the clutch mechanism (clutch CL) is attached to the second cover 22 (second wall portion).

[0071] According to this configuration, the second cover 22 (second wall portion) also functions as a support member for the actuator 30. This makes it possible to suppress an increase in the number of parts compared to when a support member for the actuator 30 is separately provided.

[0072] (4) The power transmission device 10 further includes a torque converter TC that can amplify the rotational torque of the second rotating body 12 (rotor 12), and the pump impeller 40 of the torque converter TC is connected to the second rotating body 12 (rotor 12).

[0073] According to this configuration, the second rotor 12 (rotor 12) can be assembled in a state where the pump impeller 40 of the torque converter TC is fixed.

[0074] (5) The power transmission device 10 further includes a needle bearing 92 (bearing) provided between the first rotating body 11 (input shaft 11) and the second rotating body 12 (rotor 12).

[0075] According to this configuration, rattle of the first rotor 11 (input shaft 11) can be further suppressed by the needle bearing 92 (bearing).

[0076] Although the embodiments of the present invention have been described above, the above embodiments merely illustrate some of the application examples of the present invention, and it is not intended that the technical scope of the present invention be limited to the specific configurations of the above embodiments.

[0077] For example, in the above embodiment, the power transmission device 10 includes the clutch CL, the rotating electric machine MG2, the torque converter TC, and the transmission TM. However, the power transmission device 10 does not necessarily have to include the rotating electric machine MG2, the torque converter TC, and the transmission TM. [Explanation of symbols]

[0078] 10 Power transmission device 11 First rotating body (input shaft) 12 Second rotating body (rotor) 15 rotor core 16 Stator 20 cases 20a Case 1 20b Second Case 21 First cover (first wall portion) 22 Second cover (second wall portion) 30 Actuator 43 Output shaft 90 Ball bearings 91 Ball bearings 92 Needle bearings 94 needle bearing 100 Hybrid Vehicles ENG Engine (power source) MG1 rotating electric machine MG2 rotating electric machine CL clutch (clutch mechanism) TC torque converter

Claims

1. a first rotating body that rotates by power from a drive source; a second rotating body having a through hole through which the first rotating body is inserted; a clutch mechanism that connects and disconnects power transmission between the first rotating body and the second rotating body; a case that accommodates the first rotating body, the second rotating body, and the clutch mechanism; a first wall portion attached to the case and rotatably supporting the first rotor via a bearing; a second wall portion attached to the case between the first wall portion and the clutch mechanism, and rotatably supporting the second rotating body via a bearing.

2. 2. The power transmission device according to claim 1, a rotating electric machine that generates a driving force to rotate the second rotating body, a rotor core of the rotating electric machine attached to the second rotating body;

3. 3. The power transmission device according to claim 1 or 2, An actuator for controlling the clutch mechanism is attached to the second wall portion of the power transmission device.

4. 3. The power transmission device according to claim 1 or 2, a torque converter capable of amplifying the rotational torque of the second rotor; A power transmission device in which a pump impeller of the torque converter is connected to the second rotor.

5. 3. The power transmission device according to claim 1 or 2, The power transmission device further includes a bearing provided between the first rotating body and the second rotating body.

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