JPH09203453A - Lock up clutch of torque converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve working of the working face of a facing and the working face of a cover by dividing a lock up facing, and forming a movable structure around a supporting point in each divided facing. SOLUTION: When a lock up is turned on, an auxiliary piston 10 is pushed to a cover converter 6 side by a lock up piston 4, and thereby, a L/U (lock up) facing 5 is pushed to the cover converter 6, and L/U is completed. At this time, an inclining degree is changed so as to make the auxiliary piston 10 in parallel with a working surface 7 around a supporting point 11. It is corrected by the inclining degree of the auxiliary piston 10 even if the lock up piston 4 and the working surface 7 are not in parallel with each other, and it is fastened in an optimal condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lockup clutch for a torque converter used in an automobile or the like.

[0002]

2. Description of the Related Art A conventional lockup clutch for a torque converter is shown in FIG. 14, for example. In this torque converter, the three elements of the impeller 1, turbine 2, and stator 3 are symmetrically arranged. The impeller 1 rotates in synchronization with the rotation of the engine, and the turbine 2 is connected to the gear transmission input shaft. Here, the speed ratio e (turbine rotation speed / impeller rotation speed) is e during coasting such as coasting.
When e> 1, lockup is e = 1, steady drive is e = 0.8 to 1.0, and start is e <0.3.

[0003]

However, in such a conventional lockup clutch of the torque converter, the integrated lockup piston 4 and lockup (hereinafter referred to as L / U) facing 5 are integrated. Since the structure is such that it is pressed against the contact surface 7 of the cover converter 6, one-side contact between the contact surface 7 and the L / U facing 5 is likely to occur, which adversely affects the durability of the L / U facing 5. Also, in order to avoid this problem, L /
There is a problem in that a high level of specifications is required for the surface accuracy and inclination of the surface to which the U facing 5 and the contact surface 7 are attached, which increases the cost. Further, there is a problem that the area of the L / U facing 5 cannot be increased due to the above problem. The present invention has been made by paying attention to such conventional problems, and it is an object of the present invention to solve the above problems by dividing L / U facings and providing each of the facings with a movable structure. Has an aim.

[0004]

In order to achieve the above object, in the lock-up clutch for a torque converter according to claim 1 of the present invention, a pump impeller on the input side, a turbine for transmitting power to the impeller via a fluid, and an output shaft are provided. In the torque converter configured to integrally rotate in the axial direction so as to freely slide, and to include the impeller-side member and the lock-up member facing in the contact / separation direction, the L / U facing is divided,
Each of the divided facings has a structure that is movable around a fulcrum. According to a second aspect of the present invention, there is provided the torque converter lock-up clutch according to the first aspect, wherein the torque converter lock-up clutch has the L
/ U clutch facing with a sub-piston supporting each pad and having a shape divided by a radial line passing through the division centered on the axial center, and in a state of being movable to the position of the L / U piston. A support member that can be positioned is used. According to a third aspect of the present invention, there is provided the torque converter lockup clutch according to the second aspect, wherein the subpiston has a fulcrum on a surface opposite to the L / U facing. According to a fourth aspect of the lockup clutch of the torque converter of the present invention, in the lockup clutch of the second aspect of the torque converter, a member on the piston side of the subpiston has a fulcrum for moving the subpiston.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are diagrams showing an embodiment of the present invention. First, the structure will be described. The lock-up piston 4 divides the L / U facing 5 and a sub-piston 10 that is a member having high rigidity is provided on the rear surface thereof.
Is attached. FIG. 3 shows one of the sub-pistons 10. The sub-piston 10 pushes the sub-piston 10 to press the L / U facing 5 against the surface 7. On the back surface of the sub-piston 10, the lock-up piston 4 is movable around the fulcrum 11, and when pressed, it is pressed flat against the contact surface 7.

FIG. 4 illustrates this operation. The sub-piston 10 is positioned on the lock-up piston 4 while maintaining a movable state by the sub-piston support 9. FIG. 5 shows an example of the sub-piston 10.

Next, the operation will be described. At lock-up-ON, the lock-up piston 4 presses the sub-piston 10 toward the cover converter 6 so that the L / U facing 5 is pressed against the cover converter 6 to complete the L / U. At this time, the sub-piston 10 changes its inclination so that it is parallel to the contact surface 7 with the fulcrum 11 as the fulcrum. As a result, the lockup piston 4 and the contact surface 7
Is corrected by the inclination of the sub-piston 10, even if is not parallel,
It is fastened in the optimum condition. At lock-up-OFF The lock-up piston 4 and the sub-piston 10 separate from the contact surface 7, but oil flows out from between the divided L / U facings 5, so that there is a sufficient cooling action. FIG. 6 illustrates this effect. Further, since the angle is changed so that the wedge pressure is also generated on the sub-piston facing surface, the fluid lubrication state is maintained, the seizure of the L / U facing 5 is prevented, and the drag torque is reduced. FIG. 7 illustrates this effect.

From the above, in the first embodiment, L
The rigidity of / U fading 5 is improved, the resistance to judder is enhanced, and seizure can be prevented. Therefore, it is possible to increase the fading area, and lock without increasing the number of plates of the lock-up clutch. Since it is possible to increase the up-capacity and it is not necessary to increase the surface accuracy of the contact surface of the L / U fading, the processing accuracy of the impeller 1 and the cover converter 6 can be relatively relaxed and the yield can be increased. .

A second embodiment is shown in FIGS.
The second embodiment is a variation of fulcrum formation. The sub-piston 10 according to the second embodiment does not have a structure that is movable only in the circumferential direction as shown in the first embodiment, but has a structure in which the sub-piston 10 is movable in the circumferential direction and the radial direction at the same time by being supported at one point by the fulcrum 11.

FIG. 11 shows a third embodiment. The third embodiment is different from the first and second embodiments in that the sub-piston 10 is always positioned at the center between the sub-piston supports 9 and 9 in order to avoid sticking at the side portion of the sub-piston 10. The lock-up piston 4 is provided with a piston-side fulcrum 12 so as to engage with the fulcrum 11 of the sub-piston 10.

FIG. 12 shows the fourth embodiment. In the fourth embodiment, the L / U facing 5 on the sub-piston 10 is provided with a taper 13 for introducing oil, and has wedge-shaped notches at both ends in order to cause fluid lubrication faster.

FIG. 13 shows a fifth embodiment. The fifth embodiment has a structure in which a support groove 14 is formed in the lock-up piston 4 and the sub-piston 10 is fitted therein without using the sub-piston support 9.

[0013]

As described above, according to the present invention, since the L / U facing is divided, and the structure is movable with respect to the L / U piston,
The effect that the durability of L / U facing can be significantly improved is obtained. Further, by obtaining the above effect, it is possible to take a large facing area,
It is possible to increase the lock-up capacity without using multiple plates for the lock-up clutch, and since it is not necessary to increase the surface accuracy of the surface per facing, it is possible to improve the mounting accuracy of the impeller and cover and the processing accuracy relatively. It can be relaxed and the yield can be increased.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG.

FIG. 3 is a perspective view showing an example of a sub piston.

FIG. 4 is a cross-sectional view of an essential part of the embodiment.

FIG. 5 is a front view showing an example of a sub piston support.

FIG. 6 is an explanatory diagram showing a flow of oil when lockup is OFF.

FIG. 7 is an explanatory diagram showing a function of a sub piston when lockup is OFF.

FIG. 8 is a perspective view showing a main part of the second embodiment.

9 is a view on arrow A in FIG.

10 is a view on arrow B in FIG.

FIG. 11 is a cross-sectional view showing the main parts of the second embodiment.

FIG. 12 is a cross-sectional view showing the main parts of the third embodiment.

FIG. 13 is a cross-sectional view showing the main parts of the fourth embodiment.

FIG. 14 is a cross-sectional view showing a torque converter including a conventional general single-plate lockup clutch.

[Explanation of symbols]

 1 Impeller 2 Turbine 3 Stator 4 Lock-up Piston 5 Lock-up Facing 6 Cover Converter 7 Face Facing Face 8 Turbine Hub 9 Sub Piston Support 10 Sub Piston 11 Support Point 12 Piston Side Support Point 13 Taper for Introduction 14 Support Groove

Claims (4)

[Claims] Claim: What is claimed is: 1. A pump impeller on the input side, a turbine transmitting power to the impeller through a fluid, and a shaft that rotates integrally with the output shaft so as to slide freely in the axial direction and opposes the impeller side member so as to freely contact and separate. A lock-up clutch for a torque converter having a structure in which a lock-up facing is divided, and each divided facing is movable around a fulcrum. 2. The lock-up facing has a shape divided by a radial line passing through the division centering on the axis, and has a sub-piston for supporting each pad, and at the position of the lock-up piston. The lockup clutch for a torque converter according to claim 1, further comprising a support member that can be positioned in a movable state. 3. The lockup clutch for a torque converter according to claim 2, wherein the subpiston has a fulcrum on a surface opposite to the lockup facing. 4. The lockup clutch for a torque converter according to claim 2, wherein a member on the piston side of the subpiston has a fulcrum for moving the subpiston.