JPH0680337B2 - Power transmission device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a power transmission device.

(Prior Art) Conventionally, in a vehicle transmission, the rotation generated in the engine is transmitted to a gear transmission, and the power changed in the gear transmission is transmitted to driving wheels.

In this case, in the above-mentioned gear transmission, various gears are combined to obtain a predetermined gear ratio, but it is possible to easily change the combination of gears and to avoid the troublesome operation. In addition, there is provided a semi-automatic transmission in which a fluid coupling such as a fluid coupling and a torque converter is arranged between the engine and the gear transmission and a power cutoff device is arranged (Japanese Patent Application No. 58-20529).
(See Publication No. 8).

FIG. 1 is a sectional view of a vehicle transmission incorporating a conventional power transmission device.

In the figure, 101 is an input shaft, an output shaft 103 is arranged coaxially with the input shaft 101, and a power transmission device 100 is arranged between the two. The front cover 111 and the rear cover 110A of the power transmission device 100 are connected to the input shaft 101 and rotatably arranged with respect to the output shaft 103.

Then, the front cover 111 and the rear cover 110A described above.
A fluid coupling 110 is provided on the outer peripheral portion of the oil pump, and an oil pump 170 is disposed on the center side thereof in parallel with the fluid coupling 110. The oil pump 170 is formed by relative rotation of the input shaft 101 and the output shaft 103. It is designed to be driven.

Further, a power cut-off clutch 130 is arranged in the front cover 111 and the rear cover 110A at an intermediate portion between the fluid coupling 110 and the oil pump 170. The oil pump 1 is provided on the inner peripheral side of the clutch disc plate 158.
A housing 177a of 70 is integrally formed, and the power cutoff clutch 130 connects the housing 177a and the output shaft 103 in a disengageable manner. The power cutoff clutch 130 is
It is adapted to be engaged when it is axially pressed from the output shaft 103 side to the input shaft 101 side.

Further, a direct coupling clutch 10 is provided for releasably coupling the input shaft 101 and the power cutoff clutch 130.

Then, thrust bearings are respectively provided between the housing 177a of the oil pump 170 and the front cover 111 and between the housing 177a and the rear cover 110A.
20 are provided. Housing 177 of the oil pump 170 above
The thrust bearing 20 arranged between the a and the front cover 111 supports the pressing force applied in the axial direction to engage the power cutoff clutch 130.

(Problems to be Solved by the Invention) However, in the above-described conventional power transmission device, the thrust bearing 20 supports the pressing force of the diaphragm spring 197 generated when the power cut-off clutch 130 is engaged. , The thrust bearing
Since 20 is arranged on the inner peripheral side of the housing 177a of the oil pump 170, the oil pump receives the pressing force of the diaphragm spring 197 and the reaction force of the thrust bearing 20.
The housing 177a of 170 is deformed, and interference occurs with the oil pump gear 172.

The present invention solves the problems of the conventional power transmission device described above, and the pressing force of the diaphragm spring and the reaction force of the thrust bearing deform the housing of the oil pump, causing interference with the oil pump gear. It is an object of the present invention to provide a power transmission device that prevents the above.

(Means for Solving Problems) Therefore, in the power transmission device of the present invention, the input shaft, the output shaft coaxially arranged with the input shaft, the input shaft, and the output shaft A power transmission device case rotatably arranged with respect to the shaft.

Further, a fluid coupling for transmitting power via a fluid between an input member fixed to an outer peripheral portion of the power transmission device case and an output member facing the input member, and a center side of the power transmission device case. An oil pump that is disposed in a portion and that is driven by relative rotation between the housing and the input shaft, the housing including the housing connected to the output member,
It is arranged on the inner peripheral side of the fluid coupling in the case of the power transmission device and on the outer peripheral side of the oil pump, and can be engaged and disengaged between the output member and the output shaft by receiving an axial force. And a direct connection clutch that releasably connects the input shaft and the output member.

A backing plate is disposed on the surface of the power cutoff clutch that faces the power transmission device case,
A thrust bearing is arranged in contact with both of the backing plate and the power transmission device case at a radial position corresponding to the power cutoff clutch between them.

(Operation and Effect of the Invention) According to the present invention, as described above, in the power transmission device, the input shaft, the output shaft coaxially arranged with the input shaft, the input shaft, and the output shaft are connected. A power transmission device case rotatably arranged with respect to the shaft.

Further, a fluid coupling for transmitting power via a fluid between an input member fixed to an outer peripheral portion of the power transmission device case and an output member facing the input member, and a center side of the power transmission device case. An oil pump that is disposed in a portion and that is driven by relative rotation between the housing and the input shaft, the housing including the housing connected to the output member,
It is arranged on the inner peripheral side of the fluid coupling in the case of the power transmission device and on the outer peripheral side of the oil pump, and can be engaged and disengaged between the output member and the output shaft by receiving an axial force. And a direct connection clutch that releasably connects the input shaft and the output member.

In this case, the power transmitted to the input shaft is transmitted to the input member of the fluid coupling via the power transmission device case, and is transmitted to the output member via the fluid.

Further, a power cutoff clutch is disposed on the inner peripheral side of the fluid coupling in the power transmission device case and on the outer peripheral side of the oil pump, and when the power cutoff clutch is engaged, Power is transmitted between the output member and the output shaft. A coupling clutch that disengageably couples the input shaft and the output member is provided, and when the direct coupling clutch is engaged, the transmission of power between the input shaft and the output member. Is done.

Further, a backing plate is disposed on a surface of the power cutoff clutch that faces the power transmission device case, and both are disposed at a radial position between the backing plate and the power transmission device case corresponding to the power cutoff clutch. And a thrust bearing is disposed in contact with.

Therefore, since the axial pressing force generated in the power cutoff clutch and the reaction force between the thrust bearing are directly applied to the backing plate, the housing of the oil pump is not deformed, and the housing between the housing and the oil pump gear is not deformed. It is possible to prevent the occurrence of interference and improve the durability of the power transmission device.

(Example) Hereinafter, the Example of this invention is described in detail, referring drawings.

In the present embodiment, the power transmission device of the present invention is used in a front engine front drive type automatic transmission for vehicles using a fluid type fluid coupling, and the power transmission device 100,
It consists of a gear transmission 200 for four forward speeds and one reverse speed, a differential mechanism, and a transmission case 300 accommodating these.

The power transmission device 100 includes a fluid coupling (hereinafter referred to as “coupling”) 110, a power cut-off clutch (hereinafter referred to as “clutch”) 130 provided inside thereof, and an outer periphery of the coupling 110, which is an engine in this embodiment. The direct coupling clutch 10 provided on the shaft (the right side in the figure, hereinafter referred to as the right side), the oil pump 170 provided between the input member and the output member of the coupling 110, and the clutch 130 are released and engaged. And a servo mechanism 190 for causing the movement.

The coupling 110 includes a drive plate 102, an input shaft 101 of a power transmission device 100 connected to a crank shaft of an engine, and a drive plate 102.
A front cover 111 connected via a front cover 111, an annular plate-shaped rear cover 110A, which is welded on the outer periphery to the front cover 111 and constitutes a power transmission device case together with the front cover 111, and is provided around the rear cover 110A. A pump blade (input member) 113, a turbine blade (output member) 114 arranged to face the pump blade 113, and a turbine runner 115 that holds the turbine blade 114 are provided.

A central shaft 108 is provided at the center of the front cover 111, and a large diameter portion of the central shaft 108 on the engine side has a pilot boss 105 that fits in a pilot hole 104 arranged at the center of the end surface of the input shaft 101. The tip of the gear transmission 200 side (left side in the figure, hereinafter referred to as “left side”) is an oil pump.
A drive shaft 106 of 170 is constituted, and an intermediate portion thereof constitutes a housing holding shaft 107 which slidably supports an oil pump housing 177 fixed to the oil pump 170 in both directions in the rotation direction.

A cylindrical portion 111C having a frictional engagement surface 111A in the axial direction is formed on the outer peripheral portion of the front cover 111.

Further, the turbine runner 115 is connected to the output shaft 103 through a clutch 130 that is disposed substantially at the same portion in the axial direction and radially inward.

The clutch 130 is welded at the left end to a direct coupling clutch input rear damper plate (hereinafter referred to as rear damper plate) 158B having a frictional engagement element on the outer periphery through the hub-shaped portion 116 and the plate 144 of the turbine runner 115. , A damper spring 157 is provided at the tip, a front damper plate 158C is attached to the right end of the tip, and a direct coupling clutch output damper disk (hereinafter referred to as rotatably supported on the front cover 111 via the thrust bearing 19 and the packing plate 19A). Welded to 158A as disc and clutch 130
A cylindrical clutch plate case 134 which is a disc plate of which the inner spline 133 is formed on the inner circumference.
And a hub portion 135 spline-fitted to the output shaft 103 of the power transmission device 100, a clutch hub portion 137 in which an outer peripheral spline 136 is formed at a position corresponding to the inner spline 133 of the clutch plate case 134, and the hub portion. A clutch disc wheel 139 including a disc portion 138 connecting the 135 and the clutch hub portion 137, a plurality of clutch plates 141 having an outer periphery spline-fitted to the clutch plate case 134, and an inner periphery of the clutch disc wheel 139. The clutch hub portion 137 is spline-fitted, and is composed of the clutch plates 141 and the clutch discs 143 alternately stacked.

The direct coupling clutch 10 is composed of a friction engagement surface 111A formed on the outer periphery of the inner peripheral surface of the cylindrical portion 111C of the front cover 111, and a friction engagement element 11 supported on the outer periphery of the rear damper plate 158B.

In this embodiment, an internal gear pump is used as the oil pump 170, and the housing 177 of the oil pump and the clutch disc wheel 139 are provided in the clutch disc wheel 139.
Is provided between the disk unit 138 and the disk unit 138. The oil pump 170 is fixed to the housing 177 of the oil pump at the outer peripheral portion, and the inner periphery is loosely fitted to the tip small diameter portion 103B of the output shaft 103 of the power transmission device 100 via the oil seal 175, and the thrust bearing 176 is secured. Casing abutted against the disc portion 138 of the clutch disc wheel 139 via
170A, an oil pump inner gear 172 that is rotatably fitted in a gear room in which the engine of the casing 170A is provided in the crocodile, an oil pump outer gear 171 fixed to the tip of the center shaft 108, and an output shaft 103 It is composed of a suction port 174 connected to an oil pump housing 177 and a front cover 111, which is connected to an oil passage 103A formed at the center.

The servo mechanism 190 of the clutch 130 is a connecting rod 19 connected to a clutch pedal provided in the driver's seat or a servo mechanism operated by automatic supply / discharge of intake pipe negative pressure or hydraulic pressure.
1, a pressing rod 192 rotated around a fulcrum 193 by the connecting rod 191, a bearing 195 supported by a housing 194 abutting the tip 192A of the pressing rod 192, and the bearing 19
5, a sliding sleeve 196 fitted inside, a diaphragm spring 197 whose inner peripheral edge is locked to the right end of the sliding sleeve 196, and a thrust bearing 198 which is engaged with the outer peripheral edge of the diaphragm spring 197. A clutch 1 that supports the pressing force of the pressing ring 199 and the diaphragm spring 197 for pressing the clutch 130 and is fixed to the outer peripheral side of the housing 177 of the oil pump.
Backing plate 19A fixed to 30 disks 158A
And a thrust bearing 19 disposed between the front cover 111 and the front cover 111. The thrust bearing 19 is held by an annular plate-shaped bearing holding member 19B, and the clutch 130 is released and slid (half clutch). ) Is done manually or automatically.

The gear transmission 200 has a known configuration, and the power transmission device 1
The output shaft 103 of 00 is used as an input shaft, the output shaft 201 arranged in parallel with the input shaft, a dog clutch for switching between first speed and second speed (not shown),
It has a dog clutch for switching between third speed and fourth speed, and a reverse gear.

This power transmission device 100 operates as follows.

The servo mechanism 190 of the clutch 130 has a pressing rod 192 as a fulcrum 193 when the connecting rod 191 is operated manually or automatically in the leftward direction in the drawing.
Rotate counterclockwise to displace the sliding sleeve 196 through the bearing 195 toward the engine. As a result, the sliding sleeve 196 causes the center of the diaphragm spring 197 to swell to the engine, and the pressing ring 199 connected to the outer periphery of the diaphragm spring 197 is displaced leftward in the drawing. This action releases the clutch 130. Further, the release of the pressing force applied to the clutch 130 by the diaphragm spring 197 is performed by axially pushing the engine, which has been applied to the clutch plate case 134 of the clutch 130, the turbine runner 115, the disk 158A, the thrust bearing 19 and the front cover 111, to the shaft. The direct coupling clutch 10 is also released to release the pressure. In this state, power is cut off by the clutch 130, so that the gear transmission 200 can perform a gear shift operation.

When the connecting rod 191 is actuated to the right in the figure manually or automatically, the sliding sleeve 196 is displaced to the left in the figure by the restoring force of the diaphragm spring 197, and the pressing ring 199 is moved.
Is pressed by the engine and the clutch 130 is engaged, and the input shaft 101 and the output shaft 103 of the power transmission device 100 are coupled by the coupling 110.
Are connected via.

[Brief description of drawings]

FIG. 1 is a sectional view of a conventional power transmission device, and FIG. 2 is a sectional view of a vehicle transmission incorporating the power transmission device of the present invention. In the figure, 10 ... Direct coupling clutch, 19 ... Thrust bearing, 19A ... Packing plate, 100 ... Power transmission device, 110 ... Fluid coupling, 130 ... Power shut-off clutch, 170 ... Oil pump, 190 ...... Clutch servo mechanism

Claims (5)

[Claims] 1. An input shaft, an output shaft arranged coaxially with the input shaft, a power transmission device case connected to the input shaft and rotatably arranged with respect to the output shaft. A fluid coupling for transmitting power via a fluid between an input member fixed to an outer peripheral portion of the power transmission device case and an output member facing the input member, and a fluid container on a central side portion of the power transmission device case. An oil pump provided with a housing connected to the output member and driven by relative rotation between the housing and the input shaft; and an inner peripheral side of the fluid coupling in the power transmission device case. And a power cut-off clutch disposed on the outer peripheral side of the oil pump for receiving an axial force to releasably connect the output member and the output shaft, the input shaft and the output Engagement and detachment between members In a power transmission device having a direct coupling clutch, the backing plate disposed on a surface of the power cutoff clutch facing the power transmission device case, and the power between the backing plate and the power transmission device case. A power transmission device comprising: a thrust bearing which is disposed in contact with both of them at a radial position corresponding to the disconnecting clutch. 2. The power transmission device according to claim 1, further comprising a servo mechanism for operating the power cut-off clutch by a force transmitted from the outside of the power transmission device case. 3. The servo mechanism is engaged with a sliding sleeve arranged so as to surround the output shaft, a diaphragm spring whose inner circumference is locked by the sliding sleeve, and an outer circumference of the diaphragm spring. The power transmission device according to claim 2, further comprising a pressing ring for pressing the power cutoff clutch. 4. The power transmission device according to claim 3, wherein the thrust bearing supports the pressing force of the diaphragm spring. 5. The thrust bearing is arranged between a backing plate fixed to a clutch disc plate of a power cut-off clutch and the power transmission device case, on the radially outer side of the housing of the oil pump. The power transmission device according to claim 3.