JPH0368247B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a power transmission device mainly used as a starting device for a vehicle, and particularly to a power transmission device in which a fluid coupling and a power cutoff clutch are arranged in series. .

[Conventional technology]

BACKGROUND ART Conventionally, a power transmission device equipped with a fluid coupling has been used as a starting device for a vehicle, and one type of such a power transmission device is disclosed in Japanese Patent Application Laid-open No. 1983-69355. In this device, the fluid coupling and the power cutoff clutch are arranged in series, and the output member of the fluid coupling, which supports a disc spring for engaging the power cutoff clutch, and the pressure plate are connected in a manner that prevents relative rotation. has been done. Therefore, no wear occurs between the pressure plate and the disk spring.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional device, the fluid coupling and the power cutoff clutch are arranged in series with each other, so the axial dimension is large.For example, when installed in a front engine front drive vehicle, the axial dimension is limited. If this is severe, it is disadvantageous in terms of vehicle mountability. From this point of view, when a power cutoff clutch is incorporated into a fluid coupling to reduce the axial dimension, the disc spring must be supported in the case of the fluid coupling. With this configuration, unlike a normal clutch, fluid is constantly maintained between the power cutoff clutch and the disc spring, not only during clutch engagement and release, but also when the clutch is maintained. A relative rotational difference occurs due to the rotational difference between the input and output elements of the joint, causing sliding wear on both the contact surfaces of the clutch, disc spring, and pressure plate, resulting in slipping and burning due to a decrease in clutch engagement force. This results in the occurrence of

Therefore, the present invention has a pressure plate arrangement part that absorbs the relative rotational difference between the power cutoff clutch and the disc spring to prevent the power cutoff clutch from slipping or burning due to a decrease in engagement force. An object of the present invention is to realize a power transmission device incorporating a power cutoff clutch in a fluid coupling.

[Means for solving problems]

To achieve the above object, the present invention comprises an input shaft, an output shaft, a fluid coupling and a power isolation clutch interposed in series with each other in a power transmission flow between the input shaft and the output shaft, In a power transmission device in which the power cutoff clutch is engaged by applying a biasing load of a disc spring through a pressure plate, the power cutoff clutch is disposed within a case of the fluid coupling, and the disc spring is A bearing is disposed between the pressure plate and the power cutoff clutch, and the pressure plate is supported in spline engagement with the case so as to be movable in an axial direction. It is characterized by the fact that

[Action and effect of the invention]

In the power transmission device of the present invention configured as described above, the bearing disposed between the pressure plate and the power cutoff clutch absorbs the relative rotation difference between the disc spring and the power cutoff clutch, and The pressure plate is guided by the spline engagement and is only allowed to move in the axial direction without rotating relative to the case of the fluid coupling. The power isolation clutch is engaged, disengaged, and maintained without sliding motion due to relative rotation. Furthermore, the spline engagement not only serves to restrict relative rotation, but also serves as means for positioning the center of the pressure plate.

Therefore, according to the present invention, it is possible to realize a power transmission device that is particularly compact in axial dimension, which incorporates a power cutoff clutch in a fluid coupling, and which does not cause the clutch to slip or burn out. can.

〔Example〕

FIGS. 1 and 2 show a front engine front drive vehicle transmission using a power transmission device according to an embodiment of the present invention.

This vehicle transmission includes a power transmission device 1, a gear transmission 200 for four forward speeds and one reverse speed, a differential mechanism (not shown), and a transmission case 300 housing these.

The power transmission device 1 includes a fluid coupling (hereinafter referred to as a coupling) 110, a power cutoff clutch (hereinafter referred to as a clutch) 130, and a direct coupling clutch 150.
, an oil pump 170 , and a servo mechanism 190 for engaging and disengaging the clutch 130 , in this example, the input member of the coupling 110 is connected to the input shaft 101 of the power transmission device, and the coupling 1
Ten output members are respectively connected to the output shaft 103 of the power transmission device via clutches 130, a direct coupling clutch 150 is interposed between the input member of the coupling 110 and the input side of the clutch 130, and the oil pump 170 is connected to the output shaft 103 of the power transmission device. Input shaft 101 of transmission device
and the input side of clutch 130.

The coupling ring 110 includes a front cover 111 which is a case thereof, an annular plate-shaped rear cover 110A welded to the front cover 111 at the outer periphery,
The rear cover 110A includes a pump blade 113 disposed around the inner peripheral wall surface, a turbine blade 114 disposed opposite to the pump blade 113, and a turbine runner 115 holding the turbine blade 114. The cover 111 is connected to the input shaft 101 of the power transmission device 1 connected to the crankshaft of the engine via the drive plate 102, and the coupling 11
0 input member. Front cover 1
A central shaft 108 is provided through the center of 11,
The large diameter part on the engine side is a pilot boss 105 that fits into a pilot hole 104 provided at the center of the end face of the input shaft 101, and the side of the gear transmission 200 (left side in the figure, hereinafter referred to as left side) is the tip. is the drive shaft 106 of the oil pump 170, and an oil pump housing holding shaft 107 that supports an oil pump housing 177 fixed to the oil pump 170 so as to be slidable in the rotational direction. Further, on the outer circumferential portion of the front cover 111, there is provided a cylindrical portion 11 whose inner wall surface serves as a frictional engagement surface 111A.
1 are consecutively installed.

The clutch 130 has an inner spline 1 on the inner circumference.
33 is formed in a cylindrical clutch plate case 134, and the left side is the output shaft 103 of the power transmission device 1.
The hub part 135 is spline-fitted to the inner spline 1 of the clutch plate case 134.
A clutch hub part 137 is formed with an outer peripheral spline 136 at a position corresponding to the hub part 13.
Clutch disc wheel 13 comprising a disc part 138 connecting 5 and a clutch hub part 137.
9, and a plurality of clutch plates 14 whose outer peripheries are spline-fitted to the clutch plate case 134.
1, and a clutch disk 143 whose inner periphery is spline-fitted to a clutch hub portion 137 of a clutch disk wheel 139 and which are alternately stacked with clutch plates 141. A hub-shaped part 116 of a turbine runner 115 is welded and fixed to the left end of the clutch plate case 134, and a direct-coupled clutch input rear damper plate (hereinafter referred to as rear damper plate) is provided with a friction engager on the outer periphery via a cylindrical part 144. ) 158B is connected, and a damper spring 157 is arranged at the tip,
A front damper plate 158C is attached to the right side of the front end, and a direct coupling clutch output damper disk (hereinafter referred to as disk) which also serves as a disk plate of the clutch 130 is supported in contact with a thrust bearing 160 attached to the front cover 111 via a bucking plate 161. ) 158A is welded.

The direct coupling clutch 150 includes a friction engagement surface 111A formed on the inner peripheral surface of the front cover 111 and a friction engagement element 15 supported by a rear damper plate 158B.
It consists of 0A.

In this embodiment, an internal gear pump is used as the oil pump 170, and the clutch disk wheel 1
39, the oil pump housing 177 and the disc portion 13 of the clutch disc wheel 139.
8. This oil pump 1
70 is fixed to the oil pump housing 177 at its outer circumference, its inner circumference is loosely fitted to the tip small diameter portion 103B of the output shaft 103 of the power transmission device 1 via an oil seal 175, and its right side is fitted with a thrust bearing 176. A casing 170A is brought into contact with the disc part 138 of the clutch disc wheel 139 through the casing 170A, an internal gear 172 is rotatably fitted into a gear room provided on the side of the engine of the casing 170A, and the central shaft 1
External gear 17 spline-fitted to the tip of 08
1 and an oil passage 10 formed at the center of the output shaft 103.
3A and communicated between the oil pump housing 177 and the front cover 111
It consists of 74.

The servo mechanism 190 of the clutch 130 includes a connecting rod 191 connected to a clutch pedal provided at the driver's seat or a servo mechanism operated by automatic supply/discharge of intake pipe negative pressure or hydraulic pressure, and the connecting rod 1.
A pressing rod 192 rotated around a fulcrum 193 by a pressing rod 191, a bearing 195 attached to a flange 194 that abuts the tip 192A of the pressing rod 192, and a sliding sleeve 196 fitted inside the bearing 195. rear cover 110
Support 197 is a reinforcing plate for oil seal 197B between A and sliding sleeve 196
The thrust bearing 19 is secured to the A by a claw 197a (shown in FIG. 2), and
A diaphragm spring 2 whose inner periphery 23 is locked to the right end side 196a of the diaphragm spring 2 and which is a disc spring having an annular plate shape and through which the output shaft 130 is inserted, and a plate that is engaged with the outer periphery 22 of the diaphragm spring 2. A bearing race 5 is provided between the thrust bearing 198 and the clutch plate 141 of the clutch 130. The clutch 130 is made up of a pressing ring 199 and a spline 4 connecting the pressure plate 3 and the rear cover 110A, and the clutch 130 is released and slid (half-clutched) manually or automatically.

The spline 4 is connected to the bearing race 5 of a thrust bearing 198 fixed to the outer periphery 31 of the pressure plate 3, as shown in FIG.
Outer spline 52 formed on the outer peripheral side 51 of
and an inner spline 64 formed on the inner peripheral side 63 in the axial direction 61 of the sleeve member 6 connected to the rear cover 110A.

The gear transmission 200 has a known configuration, with the output shaft 103 of the power transmission device 1 serving as an input shaft, an output shaft 201 parallel to the input shaft, and switching between a first speed and a second speed. A dog clutch 202 for switching between third speed and fourth speed, and a reverse gear (not shown) are provided.

This power transmission device 1 operates as follows.

The servo mechanism 190 of the clutch 130 operates such that when the connecting rod 191 is operated manually or automatically to the left in the figure, the pressing rod 192 rotates to the left around the fulcrum 193 and displaces the sliding sleeve 196 toward the engine via the bearing 195. let As a result, the sliding sleeve 196 bulges the center of the diaphragm spring 2 toward the engine, and the pressing ring 199 connected to the outer periphery of the diaphragm spring 2 is displaced to the left in the figure. This action releases the clutch 130. In this state, the power is cut off by the clutch 130, allowing the gear transmission 200 to perform a speed change operation.

When the connecting rod 191 is operated manually or automatically to the right in the drawing, the sliding sleeve 196 is displaced to the left in the drawing by the restoring force of the diaphragm spring 2, the pressing ring 199 is pressed against the engine, and the clutch 130 is engaged, power transmission device 1
The input shaft 101 and output shaft 103 of
10.

Not only when the clutch 130 is engaged and released during such a speed change operation, but also during the engagement of the clutch 130, unless the direct coupling clutch 150 is engaged, the relative rotation difference will be between the bearing race 5 and the pressing ring 199. However, since the thrust bearing 198 is interposed between them, no sliding friction occurs between them. On the other hand, since the pressure plate 3 rotates together with the bearing race 5 at the same speed as the engine rotation, no relative rotation difference occurs between the diaphragm spring 2 and the pressure plate 3, and between the pressure plate 3 and the bearing race 5.

In this way, according to the power transmission device of the above embodiment, the power cutoff clutch can be operated without causing a sliding movement between the diaphragm spring 2 and the pressure plate 3 by preventing the pressure plate from rotating together. Engagement and release operations and engagement maintenance are performed. Moreover, since the clutch 130 and the diaphragm spring 2 are housed on the inner circumference of the fluid coupling, the axial dimension of the entire device can be made compact.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a vehicle transmission incorporating the power transmission device of the present invention, and FIG. 2 is an enlarged view of essential parts of the power transmission device of the present invention. In the figure, 1...Power transmission device, 2...Diaphragm spring (disc spring), 3...Pressure plate, 4...Spline, 5...Bearing race (support member), 6...Sleeve member, 10
1...Input shaft, 103...Output shaft, 110...Fluid coupling, 130...Power cutoff clutch, 150...
...Direct clutch, 170...Oil pump, 19
0... Servo mechanism, 198... Thrust bearing.

Claims (1)

[Scope of Claims] 1. An input shaft, an output shaft, a fluid coupling and a power cutoff clutch interposed in series with each other in a power transmission flow between the input shaft and the output shaft, the power cutoff clutch being In a power transmission device that is engaged by applying a biasing load of a disc spring through a pressure plate, the power cutoff clutch is disposed within a case of the fluid coupling, and the disc spring is rotated relative to the case. A bearing is disposed between the pressure plate and the power cutoff clutch, and the pressure plate is supported in spline engagement with the case so as to be movable in an axial direction. Power transmission device.