JP6268016B2 - Power transmission device - Google Patents

Description

  The present invention relates to a power transmission device, and more particularly to a power transmission device that transmits or blocks power from an engine to a transmission.

  As a starting clutch in an automatic transmission, there is a device disclosed in Patent Document 1. This device has a fluid power transmission device and a dry clutch device. The fluid power transmission device can be connected to a member on the engine side, and transmits power from the engine to the transmission side via a fluid. Further, the dry clutch device connects a member on the engine side and a member on the transmission side such as a turbine of the fluid power transmission device. In addition, a release mechanism is provided to transmit power in the dry clutch device and to block power transmission. The release mechanism is disposed between the dry clutch device and the transmission, and uses the dry clutch device to simplify the structure of the starting clutch and suppress the drive loss of the oil pump.

  Patent Document 2 discloses that in a transmission device used in an outboard motor, a dry clutch device is provided on the engine side, and a torque converter is provided between the dry clutch device and the transmission.

JP 2004-286190 A JP2012-13174A

  In the devices as shown in Patent Documents 1 and 2, a dry clutch device is used to transmit power from the engine directly to the transmission side. For this reason, a release mechanism is required to turn the clutch on (transmission of power) and off (cancel power transmission) in the dry clutch device. For example, the release mechanism is configured to press an inner peripheral portion of a diaphragm spring provided in the dry clutch device in one direction.

  In the apparatus provided with the release mechanism as described above, the thrust force, which is the release load, acts on the engine crankshaft, and thus becomes a load on the engine-side components.

  An object of the present invention is to support a load for clutch operation on a fixed member on the transmission side with a simple configuration in a power transmission device having a fluid power transmission device such as a clutch device and a torque converter.

  The power transmission device according to the present invention is a device that transmits or cuts power from the engine to the transmission. The power transmission device includes a clutch device, a fluid power transmission device, a drive shaft, a clutch operation mechanism, a fixing member, and a bearing. The clutch device includes a clutch cover assembly and a clutch disk assembly disposed inside the clutch cover assembly, and transmits or blocks power from the engine to the transmission side. The fluid power transmission device transmits power from an engine to a transmission via a working fluid. The drive shaft is disposed at the center of rotation of the clutch disk assembly and the fluid power transmission device, and is connected to the output portion of the clutch disk assembly and the output portion of the fluid power transmission device to transmit power to the input shaft of the transmission. introduce. The clutch operation mechanism applies a clutch operation load to the clutch cover assembly to transmit or release the power of the clutch device. The fixing member is fixed to a member on the transmission side. The bearing rotatably supports a member that receives the operation load of the clutch operation mechanism, and receives the operation load and transmits the operation load to the fixed member.

  In this device, when the clutch device is on (power transmission state), the power from the engine is transmitted to the drive shaft via the clutch device and further to the input shaft of the transmission. On the other hand, when the clutch device is off (power transmission is cut off), the power from the engine is transmitted to the drive shaft via the fluid power transmission device and further to the input shaft of the transmission.

  In the operation as described above, the clutch device is operated by the clutch operation mechanism to be turned on or off. The clutch operating load at this time is received by a bearing and transmitted to a fixed member fixed to a member on the transmission side via the bearing.

  Here, the operation load of the clutch operation mechanism is transmitted from the bearing to the fixed member and the member that cannot rotate or move on the transmission side. Accordingly, the clutch operation load can be supported with a simple configuration without applying a load to the engine rotating component.

  In the device according to one aspect of the present invention, the clutch device transmits a power from the engine to the transmission by applying a pressing load to the clutch disk assembly by the clutch cover assembly. The clutch cover assembly can be connected to a member on the engine side, and the fluid-type power transmission device receives power from the engine via the clutch cover assembly. The clutch operating mechanism applies a clutch operating load to release the pressing load on the clutch disk assembly, and releases the transmission of power by the clutch device.

  In the device according to another aspect of the present invention, the clutch operation load is a load in a first direction from the engine side to the transmission side.

  In the device according to still another aspect of the present invention, the clutch cover assembly includes a lever member for releasing a pressing load on the clutch disk assembly. The clutch operation mechanism has an engagement member and an operation member. The engaging member engages with the inner periphery of the lever member to move the lever member in the first direction. The actuating member is disposed along the drive shaft and actuates the engaging member in the first direction.

In the device according to still another aspect of the present invention, the drive shaft has a through hole extending along the rotation shaft, and the actuating member is disposed in the through hole so as to be movable in the axial direction.

  In a device according to still another aspect of the present invention, the fluid power transmission device includes a cover, an impeller, a first seal member, a second seal member, and a third seal member. The outer periphery of the cover is connected to the clutch cover assembly. The impeller has an outer peripheral portion connected to the outer peripheral portion of the cover, and forms a fluid chamber together with the cover. The first seal member is provided between the inner peripheral portion of the cover and the drive shaft. The second seal member is provided between the inner peripheral portion of the impeller and the fixing member. The third seal member is provided between the fixed member and the drive shaft.

  Here, the fluid type power transmission device is sealed from other portions by the first to third seal members. Therefore, the clutch device can be a dry type clutch device.

  In the device according to yet another aspect of the present invention, the working fluid supplied to the fluid power transmission device is independent of the working fluid used in the engine and the transmission.

  Here, in the conventional apparatus, the working fluid is shared with the transmission and the engine. However, by making the working fluid supplied to the fluid-type power transmission device independent of the working fluid used in the engine and the transmission, it is not necessary, and the working fluid can be freely selected and changed.

  The device according to another aspect of the present invention further includes a tank for storing the working fluid of the fluid type power transmission device. And the fixing member has an oil circuit which distribute | circulates a working fluid between a tank and a fluid-type power transmission device.

  In a device according to still another aspect of the present invention, the fluid power transmission device includes an impeller to which power is input from a clutch cover, and a turbine disposed to face the impeller. Then, the working fluid supplied to the fluid power transmission device circulates between the tank, the oil circuit, and the fluid power transmission device by the pump effect of the impeller.

  Here, since the working fluid circulates by the pump effect of the impeller, a device such as an oil pump for circulating the working fluid becomes unnecessary.

  In the present invention as described above, in the power transmission device having the clutch device and the fluid type power transmission device, the clutch operation load can be supported with a simple configuration without applying a load to the engine rotating component.

Sectional drawing of the power transmission device by one Embodiment of this invention. The figure which extracts and shows the clutch apparatus of FIG. The figure which extracts and shows the torque converter of FIG. FIG. 4 is an enlarged partial view of FIG. 3.

[overall structure]
FIG. 1 shows a power transmission device 1 according to an embodiment of the present invention. The device 1 is a device that transmits or cuts power from an engine to a transmission. In FIG. 1, the engine is arranged on the right side and the transmission is arranged on the left side. The power transmission device 1 includes a clutch device 2, a torque converter 3, a turbine shaft 4 as a drive shaft, a clutch release mechanism 5, a stator shaft 6 as a fixed member, and a bearing 7. The power transmission device 1 further includes a seal mechanism 8 and a tank 9.

[Clutch device 2]
The clutch device 2 includes a clutch cover assembly 11 and a clutch disk assembly 12.

<Clutch cover assembly 11>
As shown in FIGS. 1 and 2, the clutch cover assembly 11 is connected to the crankshaft 15 of the engine via a disk-like drive plate 16 and receives power from the engine. The clutch cover assembly 11 mainly includes a clutch cover 18, a pressure plate 19, and a diaphragm spring 20. FIG. 2 shows the extracted clutch device 2 in FIG.

  As shown in FIG. 2, the clutch cover 18 includes a disc portion 18a having a circular opening at the center and a cylindrical portion 18b extending from the outer periphery of the disc portion 18a to the transmission side. The disc part 18a has an inner peripheral cylindrical part 18c extending to the engine side on the inner peripheral part. The inner peripheral surface of the inner peripheral cylindrical portion 18c comes into contact with the outer peripheral surface of the centering member 22 fixed to the crankshaft 15, whereby the clutch cover assembly 11 is positioned in the radial direction. Moreover, the volt | bolt 23 is being fixed to the outer peripheral part of the disc part 18a. The inner peripheral portion of the drive plate 16 can be fixed to the crankshaft 15 with bolts 24. The outer peripheral portion of the drive plate 16 is attached to the bolt 23 and a nut (not shown) is tightened, whereby the clutch cover 18 is attached to the crankshaft 15. Fixed.

  The disc portion 18a of the clutch cover 18 is formed with a plurality of tabs 18d at the radial intermediate portion. The plurality of tabs 18d are formed by cutting and raising a part of the disk portion 18a to the transmission side, and further bending the tip end to the outer peripheral side. The plurality of tabs 18d are formed at equiangular intervals in the circumferential direction. A plurality of openings 18e are formed in a part of the cylindrical portion 18b.

  The pressure plate 19 is an annular member having a pressing surface 19a formed on the side surface on the transmission side. The pressure plate 19 is formed with an annular projecting portion 19b projecting in the axial direction on the side surface opposite to the pressing surface 19a. The pressure plate 19 is connected to the clutch cover 18 by a plurality of strap plates 25 so as to be movable in the axial direction but not relatively rotatable.

  The diaphragm spring 20 is a disk-like member disposed between the clutch cover 18 and the pressure plate 19, and has an annular pressing portion 20a and a plurality of lever portions extending from the inner peripheral portion of the pressing portion 20a to the inner peripheral side. 20b. The pressing portion 20 a can be elastically deformed and is in contact with the protruding portion 19 b of the pressure plate 19. The inner peripheral portion of the pressing portion 20 a is supported by the tab 18 d of the clutch cover 18 via a pair of wire rings 26.

<Clutch disk assembly 12>
The clutch disk assembly 12 transmits or interrupts the power from the clutch cover assembly 11 to the transmission side, and includes a clutch plate 31 and a retaining plate 32 that are arranged facing each other in the axial direction, And a hub flange 34 and a plurality of torsion springs 35.

  The clutch plate 31 and the retaining plate 32 are disk-shaped members and have a plurality of spring support portions 31a and 32a at predetermined intervals in the circumferential direction. A clutch disk 33 is fixed to the outer periphery of the clutch plate 31. The clutch disk 33 has a plurality of cushioning plates 37 whose inner peripheral portions are fixed to the clutch plate 31, and a pair of friction members 38 fixed to both surfaces of the cushioning plate 37.

  The hub flange 34 has a hub 34a formed at the center and a flange 34b extending from the hub 34a to the outer peripheral side. A spline hole 34 d is formed at the center of the hub 34 a, and the spline hole 34 d is engaged with a spline shaft 4 a formed on the outer peripheral surface of the turbine shaft 4. The flange 34b is disposed between the clutch plate 31 and the retaining plate 32 in the axial direction. A plurality of openings 34c are formed in the flange 34b at predetermined intervals in the circumferential direction.

  The plurality of torsion springs 35 elastically connect the clutch plate 31, the retaining plate 32 and the hub flange 34 in the rotational direction. Each torsion spring 35 is accommodated in the opening 34c of the flange 34b and supported by the support portions 31a and 32a of the clutch plate 31 and the retaining plate 32.

[Torque converter 3]
The torque converter 3 transmits power from the engine to the transmission side via the working fluid. As shown in FIGS. 1 and 3, the torque converter 3 includes a cover 40, an impeller 41, a turbine 42, and a stator 43.

  The cover 40 is disposed between the clutch disk assembly 12 and the turbine 42 in the axial direction, and has a disc portion 40a and a cylindrical portion 40b as shown in FIG. A through hole is formed at the center of the disc portion 40a, and the turbine shaft 4 passes through the through hole. A friction surface 40c facing the pressing surface 19a of the pressure plate 19 is formed on the outer peripheral portion of the disc portion 40a. The friction member 38 of the clutch disk assembly 12 is sandwiched between the pressing surface 19a of the pressure plate 19 and the friction surface 40c. The cylindrical portion 40b is formed to extend from the outer peripheral portion of the disc portion 40a to the transmission side, and the tip of the cylindrical portion 18b of the clutch cover 18 is welded to the outer peripheral surface of the cylindrical portion 40b.

  The impeller 41 includes an impeller shell 45, an impeller blade 46, and an impeller hub 47. The outer peripheral end of the impeller shell 45 is welded to the cover 40. The impeller hub 47 has a cylindrical portion 47a extending toward the transmission on the inner peripheral portion.

  The turbine 42 is disposed facing the impeller 41 in the axial direction, and includes a turbine shell 50, a turbine blade 51, and a turbine hub 52. The turbine hub 52 is fixed to the inner periphery of the turbine shell 50 by rivets 54. A spline hole 52 a is formed in the inner peripheral portion of the turbine hub 52, and a spline shaft 4 b formed on the outer peripheral surface of the turbine shaft 4 is engaged with the spline hole 52 a.

  The stator 43 is disposed between the impeller 41 and the turbine 42, and includes a stator carrier 56 and stator blades 57 formed on the outer periphery of the stator carrier 56. A one-way clutch 58 is provided on the inner periphery of the stator carrier 56.

  Thrust bearings 59 and 60 are provided between the stator carrier 56 and the impeller hub 47 and between the stator carrier 56 and the turbine hub 52, respectively.

[Turbine shaft 4]
One end of the turbine shaft 4 is connected to an input shaft (not shown) of the transmission, and the other end extends through the center of the torque converter 3 and the clutch device 2 to the engine side. The turbine shaft 4 is a hollow shaft, and the spline shaft 4a that engages with the hub 34a of the clutch disk assembly 12 and the spline shaft 4b that engages with the stator carrier 56 are formed on the outer peripheral surface as described above. Has been.

[Clutch release mechanism 5]
The clutch release mechanism 5 is a mechanism for releasing the transmission of power by the clutch disk assembly 12 by applying a release load to the clutch cover assembly 11 of the clutch device 2. As shown in FIG. 1, the clutch release mechanism 5 includes an operating rod 62, a release bearing 63, and an engaging member 64.

  The operating rod 62 extends through the center of the turbine shaft 4 and is movable in the axial direction. One end of the operating rod 62 is connected to an actuator 65 provided on the transmission side, and the other end extends through the inner periphery of the release bearing 63 to the engine side. A snap ring 66 is provided at the tip of the operating rod 62, and the side surface of the snap ring 66 on the transmission side is in contact with the release bearing 63. The release bearing 63 is attached to the tip of the operating rod 62. The engaging member 64 is formed in an annular shape and holds the release bearing 63 therein. An engagement flange 64 a extending to the outer peripheral side is formed on the outer peripheral portion of the engagement member 64, and this engagement flange 64 a is in contact with the inner peripheral end of the diaphragm spring 20 from the engine side.

  When the operating rod 62 is moved to the transmission side by the actuator 65 by the release mechanism 5 as described above, the release bearing 63 and the engaging member 64 are similarly moved to the transmission side, whereby the lever portion 20b of the diaphragm spring 20 is moved. The inner peripheral edge moves to the transmission side. Then, the diaphragm spring 20 moves the outer peripheral end portion (pressing portion 20a) to the engine side with the portion supported by the wire spring 26 as a fulcrum. That is, the pressure on the pressure plate 19 by the diaphragm spring 20 is released, and the pressure plate 19 moves in a direction away from the friction surface 40 a of the cover 40 by the strap plate 25. As a result, the transmission of power from the engine to the transmission side by the clutch disk assembly 12 is released.

[Stator shaft 6]
As shown in FIGS. 1 and 3, the stator shaft 6 is disposed on the transmission side of the torque converter 3, and has a fixed flange 6a and a shaft portion 6b. The fixing flange 6a is formed in a disk shape and is fixed to a transmission-side member (not shown). The shaft portion 6b has a hollow shape, and as shown in FIG. 4 which is an enlarged partial view of FIGS. 1 and 1, a first shaft portion 6c extending to the engine side, a second shaft portion 6d extending to the transmission side, have. The first shaft portion 6c has a small diameter portion 6e and a large diameter portion 6f, and a spline shaft 6g is formed at the tip of the small diameter portion 6e. The spline shaft 6g is engaged with a spline hole 58a formed on the inner peripheral surface of the one-way clutch 58.

[Bearing 7]
As shown in FIGS. 1 and 4, the bearing 7 is attached to a small diameter portion 6 e formed in the first shaft portion 6 c of the stator shaft 6. More specifically, the bearing 7 is press-fitted to the largest diameter portion 6f side of the small diameter portion 6e, and the inner ring 7a is in contact with the side surface on the engine side of the large diameter portion 6f.

  A cylindrical portion 47 a of the impeller hub 47 is supported on the outer ring 7 b of the bearing 7. A stepped portion 47 b is formed on the inner peripheral surface of the cylindrical portion 47 a of the impeller hub 47, and the stepped portion 47 b is in contact with the side surface on the engine side of the outer ring 7 b of the bearing 7.

  In such a configuration, the thrust force (mainly the release load by the release mechanism 5) acting on the impeller 41 is transmitted to the inner ring 7a via the outer ring 7b and the rolling element 7c of the bearing 7, It is transmitted from the inner ring 7a to a fixed member that cannot rotate and move on the transmission side via the large-diameter portion 6f of the stator shaft 6.

[Seal mechanism 8]
In the power transmission device 1, a seal mechanism 8 is provided so that the working fluid of the torque converter 3 does not leak to the clutch device 2 side or the outside of the torque converter 3.

  As shown in FIGS. 1 and 3, the seal mechanism 8 includes first to third seal members 71 to 73. The first seal member 71 is provided between the inner peripheral portion of the cover 40 and the outer peripheral surface of the turbine shaft 4. The second seal member 72 is provided between the outer peripheral surface of the cylindrical portion 47 a of the impeller hub 47 and the fixed flange 6 a of the stator shaft 6. The third seal member 73 is provided between the inner peripheral surface of the second shaft portion 6 d of the stator shaft 6 and the outer peripheral surface of the turbine shaft 4.

  Such a sealing mechanism 8 can prevent the working fluid of the torque converter 3 from flowing out to the outside or the clutch device 2 side. Therefore, a dry type clutch can be employed as the clutch device 2. Furthermore, the working fluid can be separated from the engine and transmission lubricating oil, and the working fluid can be freely selected and changed, thus increasing the degree of design freedom.

[Tank 9 and oil circuit 75]
The tank 9 stores the working fluid of the torque converter 3 and is provided separately from the engine and the transmission. As shown in FIGS. 1 and 3, the tank 9 and the torque converter 3 are connected by an oil circuit 75, and the working fluid circulates without equipment such as an oil pump by the pump effect of the impeller 41 of the torque converter 3. It is supposed to be made.

  The oil circuit 75 includes a plurality of oil passages P <b> 1 to P <b> 3 formed in the fixed flange 6 a of the stator shaft 6 and gaps between the shaft portion 6 b of the stator shaft 6 and the turbine shaft 4. Specifically, as shown in FIGS. 1, 3, and 4, first to third oil passages P <b> 1 to P <b> 3 are formed in the fixed flange 6 a of the stator shaft 6. The first oil passage P1 extends in the radial direction from the outer peripheral surface of the fixed flange 6a toward the inner peripheral side. One end of the first oil passage P1 is open to the outer peripheral surface of the fixed flange 6a, and the end on the inner peripheral side does not penetrate into the internal space. The second oil passage P2 extends in the axial direction from the side surface on the engine side of the fixed flange 6a toward the transmission side, and communicates with the first oil passage P1. One end of the second oil passage P2 on the engine side is open, but the other end is not open. Similar to the first oil passage P1, the third oil passage P3 extends in the radial direction from the outer peripheral surface of the fixed flange 6a toward the inner peripheral side. One end of the third oil passage P3 opens to the outer peripheral surface of the fixed flange 6a, and the other end on the inner peripheral side opens to a space between the shaft portion 6b of the stator shaft 6 and the outer peripheral surface of the turbine shaft 4. .

  A first external oil passage PO1 is provided between the opening of the first oil passage P1 and the tank 9, and a second external oil passage PO2 is provided between the third oil passage P3 and the tank 9. ing.

  In the configuration as described above, the tank 9 → the first external oil path PO1 → the first oil path P1 → the second oil path P2 → the space between the outer ring 7b and the inner ring 7a of the bearing 7 → the impeller hub 47 and the stator carrier 56 → Gap between torque converter 3 → Gap between turbine hub 52 and stator carrier 56 → Gap between shaft portion 6b of stator shaft 6 and turbine shaft 4 → Third oil passage P3 → Second external The hydraulic oil can circulate in the path of the oil path PO2 → tank 9.

[Operation]
In the power transmission device 1, when the clutch release mechanism 5 is not operating, the clutch device 2 is on (power transmission state). Specifically, the pressure plate 19 is pressed toward the cover 40 by the diaphragm spring 20, whereby the clutch disk 33 of the clutch disk assembly 12 is interposed between the pressing surface 19 a of the pressure plate 19 and the friction surface 40 c of the cover 40. It is pinched. Thus, power from the engine is transmitted from the clutch cover assembly 11 to the turbine shaft 4 via the clutch disk assembly 12. The power transmitted to the turbine shaft 4 is transmitted to an input shaft of a transmission connected to the turbine shaft 4.

  On the other hand, when the clutch device 2 is turned off (power cutoff state) by the clutch release mechanism 5, the power from the engine is transmitted to the transmission side via the torque converter 3. More specifically, as described above, when the operating rod 62 is moved to the transmission side by the actuator 65, the release bearing 63 and the engaging member 64 are similarly moved to the transmission side, whereby the pressure plate by the diaphragm spring 20 is moved. The pressure on 19 is released. Then, the pressure plate 19 is moved away from the friction surface 40a of the cover 40 by the strap plate 25, and the transmission of power from the engine to the transmission side by the clutch disk assembly 12 is released.

  In such a state, the power transmitted from the engine to the clutch cover assembly 11 is input from the cover 40 to the impeller 41. The power is transmitted from the impeller 41 to the turbine 42 via the working fluid and further to the turbine shaft 4.

  The torque converter 3 is supplied from the tank 9 to the fluid chamber of the torque converter 3 through the first external oil passage PO1, the first and second oil passages P1 and P2, and the bearing 7. Further, the working fluid from the fluid chamber is returned to the tank 9 from the gap between the shaft portion 6b of the stator shaft 6 and the turbine shaft 4 via the third oil path P3 and further the second external oil path PO2.

  The working fluid is circulated by the pump effect of the impeller 41 as described above. Therefore, equipment such as an oil pump is not necessary.

[Other Embodiments]
The present invention is not limited to the above-described embodiments, and various changes or modifications can be made without departing from the scope of the present invention.

  (A) The specific configurations of the clutch device 2, the torque converter 3, and the clutch release mechanism 5 are not limited to the above-described embodiment, and various modifications are possible.

  (B) In the above embodiment, a torque converter is employed as the fluid power transmission device, but a fluid coupling may be employed.

  (C) In the above embodiment, the clutch device is a normally closed type (when the clutch operating load is not applied, the clutch is turned on (power transmission), and the clutch is turned off by applying the clutch operating load (power transmission is released). However, it may be a normally open type.

  (D) Arrangement | positioning of a clutch apparatus and a torque converter is not limited to the said embodiment. For example, the torque converter may be disposed on the engine side, and the clutch device may be disposed between the torque converter and the transmission.

DESCRIPTION OF SYMBOLS 1 Power transmission device 2 Clutch device 3 Torque converter 4 Turbine shaft (drive shaft)
5 Clutch release mechanism (clutch operating mechanism)
6 Stator shaft (fixing member)
7 Bearing 9 Tank 11 Clutch cover assembly 12 Clutch disk assembly 20 Diaphragm spring 40 Cover 41 Impeller 42 Turbine 62 Actuating rod (actuating member)
63 Release bearing 64 Engagement members 71 to 73 Seal member 75 Oil circuit

Claims (9)

A power transmission device that transmits or cuts power from an engine to a transmission,
A clutch device having a clutch cover assembly and a clutch disk assembly disposed inside the clutch cover assembly, and transmitting or interrupting power from the engine to the transmission side;
A fluid power transmission device for transmitting power from the engine to the transmission via a working fluid;
The clutch disk assembly and the fluid power transmission device are disposed at the center of rotation of the clutch disk assembly and connected to the output portion of the clutch disk assembly and the output portion of the fluid power transmission device to transmit power to the input shaft of the transmission. A drive shaft that transmits to
A clutch operating mechanism for applying a clutch operating load to the clutch cover assembly to transmit or release the power of the clutch device;
A fixing member fixed to the transmission side member;
A bearing that rotatably supports a member that receives an operation load of the clutch operation mechanism, and a bearing that receives the operation load and transmits the operation load to the fixing member;
Power transmission device with The clutch device is configured to transmit a power from the engine to the transmission by applying a pressing load to the clutch disk assembly by the clutch cover assembly.
The clutch cover assembly is connectable to a member on the engine side;
The fluid type power transmission device receives power from the engine via the clutch cover assembly,
The clutch operating mechanism releases the pressing load to the clutch disk assembly by applying the clutch operating load, and cancels transmission of power by the clutch device;
The power transmission device according to claim 1.   The power transmission apparatus according to claim 2, wherein the clutch operation load is a load in a first direction from the engine side toward the transmission side. The clutch cover assembly has a lever member for releasing a pressing load on the clutch disc assembly,
The clutch operating mechanism is
An engagement member for engaging the inner periphery of the lever member to move the lever member in the first direction;
An actuating member disposed along the drive shaft and actuating the engaging member in the first direction;
Having
The power transmission device according to claim 3. The drive shaft has a through hole extending along the rotation axis;
The actuating member is disposed in the through hole so as to be movable in the axial direction.
The power transmission device according to claim 4. The fluid power transmission device is
A cover having an outer peripheral portion coupled to the clutch cover assembly;
An impeller connected to an outer peripheral portion of the cover and forming a fluid chamber together with the cover;
Have
A first seal member provided between an inner periphery of the cover and the drive shaft;
A second seal member provided between the inner periphery of the impeller and the fixing member;
A third seal member provided between the fixed member and the drive shaft;
Further equipped with,
The power transmission device according to any one of claims 1 to 5.   The power transmission device according to claim 6, wherein the working fluid supplied to the fluid power transmission device is independent of the working fluid used in the engine and the transmission. A tank for storing a working fluid of the fluid power transmission device;
The fixing member has an oil circuit for flowing a working fluid between the tank and the fluid power transmission device.
The power transmission device according to any one of claims 1 to 7. The fluid power transmission device is
An impeller to which power is input from the clutch cover;
A turbine disposed opposite the impeller;
Have
The working fluid supplied to the fluid power transmission device circulates between the tank, the oil circuit, and the fluid power transmission device by a pump effect of the impeller.
The power transmission device according to claim 8.

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