JP3322709B2 - Damper device for lock-up clutch for torque converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention provides an input case which the output of the engine is transmitted, a fixed pump input case, the turbine is provided to face the pump, and the stay data
Or Ranaru slide on the turbine hub of a torque converter, the clutch piston to frictionally engage the input case, the first and second drive plate which is fixed to the clutch piston, between the first and second drive plates And a damper device for a lock-up clutch for a torque converter having a driven plate driven by a drive plate via a spring.

[0002]

2. Description of the Related Art Recently, torque converters have been widely used for power transmission mechanisms of automobile engines. Since a torque converter is a type of fluid coupling that uses a pump and a turbine, slippage exists between the pump and the turbine even when the rotation speeds of the turbine and the pump are approximately equal, and the torque converter is directly connected with the mechanical clutch. Power transmission efficiency is lower than that.

Therefore, a lock that can directly connect the input shaft and the output shaft is provided in a space formed between the input case fixed to the input shaft of the torque converter to which the power from the engine is transmitted and the outer peripheral surface of the turbine runner. Providing an up clutch is performed. FIG. 4 is a sectional view showing an example of a torque converter having a lock-up clutch having a damper device. Referring to FIG. 4, reference numeral 1 'denotes an input shaft of a torque converter 10 to which power from an engine is transmitted, and 2 denotes an input shaft. An input case fixed to 1, a pump fixed to the input case 3, a turbine 4 provided opposite to the pump 3, and a stator 5. (A detailed description of the torque converter is omitted because it is a well-known technology.) Reference numeral 7 denotes a clutch piston provided in a space between the input case 2 and the turbine 4 and slidable on the turbine hub 6, and reference numeral 8 denotes a clutch lining. When hydraulic pressure is introduced to the left of the clutch piston 7 and the piston clutch 7 is pressed against the input case 2, the clutch lining 8
Causes the clutch piston 7 to rotate together with the input case.

The outer peripheral surface 71 of the clutch piston 7 and the drive disk 61 are connected in a torque transmitting relationship by spline engagement. Further, the drive disk 61 is provided with a spring 24
Are operatively connected to the first driven disk 51 and the second driven disk. The first driven disk 51 is fixed to the turbine hub 6 with a pin 55. The first and second driven disks 51 and 52 are connected by pins 56.

[0005] When the clutch is engaged, the power of the engine enters the input shaft, passes through the input case 2 and the clutch piston 7 and enters the drive disk 61 operatively connected to the outer peripheral surface 71 of the clutch piston 7. The drive disk 61 drives the first driven disk 51 via the spring 24, and the power is transmitted to the output shaft 11 via the turbine hub 6. The spring 24 includes the drive disk 61 and the first driven disk 5
The operation of the damper is performed during the interval of 1.

[0006]

Problems to be Solved The above-mentioned damper device of the lock-up clutch for a torque converter has no guide for the rotational movement of the drive disk, so that the drive disk promotes the vibration against the vertical vibration from the engine, There is a risk that sliding friction due to rubbing between the disk and the driven disk, and damage or friction due to hitting between the spring and the drive disk window may occur.

Further, since the centrifugal load of the spring is applied to the outer peripheral portion of the piston via the drive plate, the facing is brought into contact with the outer peripheral surface piece due to the deformation of the flange to the outer peripheral side, causing high heat generation, burning of the facing and peeling of the facing. There was danger. For these reasons, it has been necessary to increase the thickness of the piston, to provide a precision factory for the clearance dimension between the piston and the damper connecting portion, and to perform an expensive heat treatment effective against rubbing and hitting.

Further, since the damper body is mounted inside the outer periphery of the piston, a large spring operating diameter cannot be obtained, a large spring cannot be used, and the damper function cannot be enhanced.

[0009]

According to the present invention, in order to solve the above-mentioned drawback, a power transmission piece is fixed to a portion of the curved portion of the turbine that protrudes most toward the lock-up clutch. Of the driven plate protrudes at right angles from the mounting surface, and is spline-fitted to the inner peripheral surface of the driven plate. Further, the driven plate and the first and second drive plates are connected to each other via a spring in accordance with a change in torque. has become possible slight circumferential relative motion Te, further, the torque converter first drive plate, characterized in that it comprises a long hole for receiving a distal end portion of the output projection possible said relative motion Of a lock-up clutch for a vehicle.

[0010]

FIG. 1 is a side sectional view of a torque converter 10 having a lock-up clutch according to the present invention, and FIG. 2 is a front view of the damper device partially cut away and viewed from the turbine side. In the drawing, reference numeral 1 denotes a centering portion of an output shaft of power from an engine, 2 denotes an input case fixed to the centering portion 1, 3
Is a pump fixed to the input case, 4 is a turbine provided to face the pump, 5 is a stator, and 6 is a turbine hub, which is directly connected to an output shaft (not shown). Numeral 11 denotes the axis of the input shaft and the output shaft.

A clutch piston 7 is provided so as to slide on the turbine hub 6 in a space formed between the input case 2 and the turbine 4. Reference numeral 8 denotes a friction material. When hydraulic pressure is introduced to the right side of the clutch piston 7, the clutch piston 7 is pressed against the input case 2 and rotates together with the input case 2 due to the friction material 8. The first drive plate 21 is fixed to the clutch piston 7 by a rivet 25. The second drive plate 22 is fixed to the turbine side of the first drive plate 21 with a rivet 27 at an interval.

Further, the first and second drive plates 21,
A driven plate 23 is mounted between the two via a spring 24. In FIG. 2, reference numeral 28 denotes an elongated hole provided in the driven plate 23, through which a rivet 27 passes.
When the torque fluctuates, it is possible to perform relative movement in the circumferential direction with respect to the first and second drive plates 21 and 22 while receiving the damper action of the spring 24.

Reference numeral 22S denotes a spring holding window of the second drive plate 22, and 23S denotes a spring receiving window of the driven plate 23. (The spring holding window of the first drive plate 21 does not appear to be on the opposite side in FIG. 2.) The power transmission piece 30 is located at the most protruding portion of the bent portion of the turbine 4 toward the clutch piston 7 substantially at the center. Attach, and project the output projection 31 at right angles from the mounting surface.

Further, a spline groove 32 is formed on the inner periphery of the driven plate 23 at a position corresponding to the output projection 31, and the output projection 31 is fitted. Therefore, the output projection 31 can perform power transmission and centering of the driven plate. In terms of operation, the clutch piston 7
When the input case 2 is engaged with the input case 2, the rotation of the input case 2 is transmitted to the first and second drive plates 21 and 22 via the clutch piston 7. This rotation is transmitted to the driven plate 23 through the spring 24, and the power transmission piece 30 attached to the turbine 4 by fitting the spline groove 32 of the driven plate 23 with the output projection 31.
And transmitted to the output shaft via the turbine hub 6.

In transmitting the power as described above, the spring 2
4 act as a damper, and the driven plate 23 and the first and second drive plates 21 and
2 is adapted to perform a slight relative movement in the circumferential direction via a spring 24. Therefore, the driven plate 23 is provided with the elongated hole 28 as described above, and the first hole 28 is formed therein.
The rivet 27 connecting the second drive plate is movable. The first drive plate 21 is provided with a long hole 26, and the tip of the output projection 31 enters the long hole 26 and falls within the range. Can move.

FIG. 3 is an exploded view of each part for easy understanding of the damper device of the present invention. The clutch piston 7 and the first drive plate 21 are connected by rivets 25, and the rivets 27 The first drive plate 21 and the second drive plate 22 are coupled with a space therebetween, and a driven plate 23 is provided therebetween via a spring 24.

The rivet 27 passes through the elongated hole 28 of the driven plate 23, and the driven plate 23 can move relative to the first and second drive plates 21 and 22 in the circumferential direction to cope with torque fluctuation. As a result, the spring 24 performs a buffering action. An output projection 31 is welded and fixed to the most inflated portion of the turbine 4, and the output projection 31 is fitted into a spline groove 32 on the inner periphery of the driven plate 23. Thus, the output from the engine is the clutch piston 7, the first and second drive plates 21, 22.
And transmitted to the driven plate 23 via the spline groove 32 and the output projection 31 from the driven plate 23.

[0018]

According to the present invention, the output projection portion is provided with the torque transmission and the centering of the damper, so that the vibration from the engine is not promoted by the damper body. It can prevent the window from being hit or damaged, and can operate the damper smoothly.

Since the input connecting portion of the damper is located at the center of the piston, the outer peripheral surface of the clutch piston can be shortened, the operating radius of the spring can be increased, and a large spring can be attached to enhance the damper action. Since the portion is the most protruding portion on the lock-up clutch side substantially at the center of the curved portion of the turbine, the whole becomes compact, and a lightweight and inexpensive damper is obtained.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a torque converter embodying the present invention.

FIG. 2 is a front view of the damper device, partially cut away.

FIG. 3 is an explanatory view showing the damper device in an exploded manner.

FIG. 4 is a side sectional view of an example of a conventional damper device.

[Explanation of symbols]

 Reference Signs List 1 Centering portion of engine output shaft 2 Input case 3 Pump 4 Turbine 5 Stator 6 Turbine hub 7 Clutch piston 8 Friction material 10 Torque converter 11 Axis 21 First drive plate 22 Second drive plate 23 Driven plate 24 Spring 25 Rivets 26 Length Hole 27 rivet 28 long hole 30 power transmission piece 31 output projection 32 spline groove 51 first driven disk 52 second driven disk 54 output shaft 55 pin 56 pin 61 drive disk 71 outer peripheral surface of clutch piston

Claims (1)

(57) [Claims] Input case the output of 1. A engine is transmitted, a pump fixed to the input case, slide turbine provided to pump the opposite, as well as on the turbine hub of the stay data or Ranaru torque converter A clutch piston frictionally engaged with the input case, first and second drive plates fixed to the clutch piston, disposed between the first and second drive plates, and driven by the drive plate via a spring. In a damper device for a lock-up clutch for a torque converter having a driven plate having a driven plate, a power transmission piece is fixed to a position substantially protruding toward the lock-up clutch at substantially the center of the curved portion of the turbine, and an output projection of the power transmission piece is At the same time as projecting at right angles from the mounting surface, And then down篏合, driven plate and the first and second in accordance with a variation in torque
And the drive plate is capable of a slight relative movement in the circumferential direction via a spring. Further, the first drive plate is provided with an elongated hole for receiving the tip portion of the output projection in the relative movement. <br/> Te have Turkey and the damper device of the lock-up clutch for a torque converter according to claim.