JP3322707B2 - Damper device for lock-up clutch for torque converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock-up clutch damper for a torque converter.

[0002]

2. Description of the Related Art At present, fluid torque converters are widely used as power transmission devices for automobiles and the like. However, since the fluid coupling is provided with the pump and the turbine facing each other to transmit power, slippage always exists between the pump impeller and the turbine runner. Therefore, the power transmission efficiency is reduced as compared with a direct connection transmission mechanism using a mechanical clutch.

Therefore, a piston having a clutch function capable of mechanically directly connecting the input case and the turbine is axially moved between the inner surface of the input case for transmitting the output of the engine to the pump and the outer peripheral surface of the turbine runner. Torque converters have been developed that have a mechanical clutch provided. It has also been considered to provide a spring on the piston in order to absorb torque fluctuations between the turbine and the piston performing the clutch action.

FIG. 3 is a sectional side view of an example of a conventional damper device for a clutch for a torque converter, and FIG. 4 is a sectional view taken along line AA of FIG.
1 'is an engine output shaft, 2 is a pump, 3 is a turbine,
Reference numeral 4 denotes a stator, 5 denotes a turbine hub, 7 denotes an output shaft of a torque converter (connected to a transmission), 21 denotes an input case of the torque converter, and 22 denotes a piston which moves on the hub 5 in an axial direction (action of a clutch plate). Reference numeral 27 denotes a friction material provided on the piston 22. (The torque converter and the clutch are well known in the art and will not be described in detail.) A spring 32 extending in the circumferential direction is arranged on the inner peripheral side of the outer peripheral flange 28 of the piston 22 to absorb torque fluctuation. The end face support member 25 is fixed to the piston 22 by a rivet 26 so that the side washer 29 is locked. An output projection 31 fixed to the turbine for transmitting torque is provided between the springs 32.

[0005]

In the conventional damper device as described above, the expansion and contraction each time does not always perform the same operation due to friction or catch between the spring and the outer peripheral flange of the piston as described later. Also, sliding friction occurs on the end surface of the spring. Furthermore, since there is no stopper for stopping the bending of the spring, the spring comes into close contact with the spring, causing damage or settling of the spring, and the risk of the spring seat falling off is extremely high.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a spring disposed on an inner peripheral side of an outer peripheral flange of a piston movable on an output shaft of a torque converter in an axial direction. The retaining plate fixed to the piston, the output projection fixed to the turbine, and the both ends of each spring are arranged at the positioning part of the spring. in and consists of a cylindrical cap that protects the spring, the damper device at action spring is contracted pushed by the driving force, mutual spring end portions
In which to obtain the characteristics and to holder <br/> bumpers device that open ends of oppositely disposed cap spaced along compression Sprint <br/> grayed is limited Consistent with.

FIG. 1 is a side sectional view of an embodiment of the present invention, and FIG.
1 is a view taken along the line XX of FIG. 1, 10 is a torque converter main body, 1 is a centering portion of an engine output shaft, 2 is a pump,
Reference numeral 3 denotes a turbine, 4 denotes a stator, 5 denotes a turbine hub of a torque converter, 6 denotes an axis, 21 denotes an input case connecting an engine output shaft and a pump, and 22 denotes a shaft that moves on the hub 5 in an axial direction to act as a clutch plate. Piston 23 is a holding plate fixed to the piston 22 with rivets 26, 24
Is a cut-and-raised outer peripheral flange 2 of the piston 22.
8 is cut and raised from the plate 23 inside the spring 32 disposed on the inner peripheral side of the plate 8. Reference numeral 25 denotes a spring end surface support member bent in an inverted U-shape at an upper portion of the plate 23, and reference numeral 33 denotes a cylindrical cap at both ends of the spring for accommodating the spring end. Reference numeral 27 denotes a clutch friction material.

[0008] The output projection 31 is fixed to the turbine 3 and disposed at the shaft surface support member 25 between the springs 32. The upper portion 32A in FIG. 2 indicates that the spring 32 is compressed, the opening end of the cap 33 is aligned, and the spring is not further compressed.
2B is cut and raised, and the illustration of the cut and raised portion 24 is omitted, and the spring and the cap are shown in cross section.

[0009]

The hydraulic pressure is applied to the right side of the piston 22 and the piston 2
When the piston 2 is moved to the left and pressed against the input case, the rotation of the piston 22 is transmitted to the turbine 3 via the end face support member 25, the cap 33, the spring 32, and the output projection 31, and the turbine 3 is fixed to the turbine hub 5. Therefore, the output shaft (not shown) is rotated through the output hub.

The fluctuation of the torque is absorbed by a spring 32, which is positioned between the end face support members 25, and the cut-and-raised portion 24 prevents the axial displacement. Referring to FIG. 5 and below, the spring device of the present invention will be compared with a conventional spring device. (A) on the left side of the center line XX in FIG. 5 shows the left half of the spring device of the present invention.
(B) shows the right half of the conventional spring. In the present invention, both ends of the spring 32 are housed in the cap 33, and in the conventional one, the washers 29 are placed at both ends of the spring 32.

FIGS. 6A and 6B show a state in which the spring is set on the inner periphery of the outer peripheral flange 28 of the piston 22 and a rotational state when the clutch is not operated. FIG. 6A shows the left half of the present invention, and FIG. The right half of the thing is shown. When the spring is fitted on the inner circumference of the piston, a bending force is generated as indicated by a black arrow. However, in the present invention, since the spring 32 is housed at both ends in the cap 33, there is no bending along the flange portion 28. However, in the conventional device shown in FIG.

FIGS. 7A and 7B are explanatory views of a state in which the piston 22 is operated and the damper device is operating. FIG. 7A shows the state before the spring is deformed, and FIG. 32 are compressed and placed opposite each other.
The open end of the cap 33 is matched with, more indicates that it is not compressed. (Corresponding to 32A in FIG. 1)
8A and 8B show a case of a conventional spring, in which FIG. 8A shows a state before the spring is deformed, and FIG. 8B shows a state where the spring is compressed by a driving force F. FIG.

When the spring is compressed, the portion indicated by M tends to be caught and the sliding friction is large. Again N
The spring wears due to friction at the locations indicated by.
At the time of compression shown in (B), since there is no stopper for stopping the bending of the spring, the spring comes into close contact with the spring, causing breakage and settling.

[0014]

The damper device of the present invention has the above-described structure, and can prevent the spring absorbing the torque fluctuation from coming off in the axial direction. Further, since the end surface of the spring is not polished, the processing cost can be reduced. , And furthermore, the operation was smoothened because the spring was not caught by the movement of the spring, so that the spring was not worn, set or damaged, and the durability was improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an embodiment of the present invention.

FIG. 2 is a view as viewed in the direction of arrows XX in FIG. 1;

FIG. 3 is a side sectional view of an example of a conventional damper device.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

[Figure 5] Ru Figure der showing a scan pulling.

[6] Ru FIG der showing a rotation state at the time the state and the clutch inoperative set with scan pulling.

7 is a diagram showing a state after state and pressure <br/> contraction of actuation at the start of the spring aspect of this.

8 is a diagram showing a traditional state and the state after the compression of the operation start time of the spring.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Centering part of engine output shaft 2 Pump 3 Turbine 4 Stator 5 Turbine hub 6 Axis line 7 Output shaft 10 Torque converter main body 21 Input case 22 Piston 23 Holding plate 24 Cut-and-raised 25 End support member 26 Rivets 27 Clutch friction material 28 Piston Outer peripheral flange 29 Spring washer 31 Output projection 32 Spring 33 Cap

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16H 45/02 F16F 15/123 F16D 11/00-23/14

Claims (1)

(57) [Claims] 1. A pump connected to the input shaft through the input case, provided opposite to the pump, a turbine which is connected to the output shaft, and is supported on the output shaft of the torque converter with a stay data, An axially movable piston is provided between the input case and the turbine to act as a lock-up clutch, and the piston and the turbine can move relative to each other in the circumferential direction via a plurality of springs A damper device for a lock-up clutch for a torque converter connected to a piston, comprising: a spring disposed on an inner peripheral side of an outer peripheral flange of the piston; And a power plate fixed to the turbine, and an output protrusion fixed to the turbine, which is disposed at the spring positioning portion. And protect the spring by storing both ends of each spring
Consists of a cylindrical cap, the damper device at action spring is contracted pushed by the driving force, the opposing arrangement of the spring end portions
A compression damper device for a torque converter lock-up clutch, wherein the compression end of the spring is restricted by matching the open ends of the caps.