JPH0623799Y2 - Lockup clutch actuation control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is intended for a lockup clutch of a torque converter used in an automobile or the like, and more specifically, controls the disengagement operation in such a clutch. The present invention relates to a control device for.

[Prior Art] As is well known, a lockup clutch is generally arranged between a front cover, which is an input member of a torque converter, and a turbine. The pressure contact and disengagement operation of the facing, that is, the clutch connection / disconnection operation is controlled.

[Problems to be solved by the invention] However, in the conventional structure, the operation of the piston is controlled only by the hydraulic pressure, so that the clutch disengagement operation cannot return the piston to the disengagement position reliably and promptly. As a result, in the clutch disengagement operation, the half-clutch state is maintained for a relatively long time, which may cause seizure in the facing.

The present invention aims to solve the above problems.

[Means for Solving the Problems] In the present invention, a lockup clutch 70 is arranged between the front cover 1 which is an input part of a torque converter and the turbine 5 which is an output part, and the lockup clutch 70 includes
Driven in the axial direction by hydraulic pressure, the front cover 1 on the outer peripheral part
1 having a facing 19 facing the inner surface of the piston
1 and a clutch disc 10 having an outer peripheral portion connected to the facing surface 19 of the piston 11 in the radial direction and having a torsion spring 14, and the turbine hub 36 is provided with an inner peripheral cylindrical portion 38 and a front cover 1 on the opposite side. A flange 3 that extends outward from the end and is fixed to the surface opposite to the front cover 1 with the rivet 43 on the inner peripheral portion of the turbine shell 30.
9 and an outer peripheral tubular portion 40 extending from the outer peripheral edge of the flange 39 to the front cover 1 side, and a space 41 between the inner peripheral tubular portion 38 and the outer peripheral tubular portion 40 is provided with an inner peripheral portion of the piston 11. The tubular portion 44 that accommodates 60 and extends from the inner peripheral edge of the output plate 13 of the clutch disc 10 to the turbine 5 side is spline-fitted to the outer periphery of the turbine hub outer peripheral tubular portion 40 to form the piston inner peripheral side portion 60. A tubular portion 61 extending from the inner peripheral edge to the front cover 1 side is slidably fitted to a small diameter portion 38a of the turbine hub inner circumferential tubular portion 38 on the front cover 1 side, and the small diameter portion 38a of the front cover 1 side is attached. Annular spring bearing 6 held by snap ring 71 at the end
3 and the piston inner peripheral side portion 60, a return spring 62 is arranged to press the piston inner peripheral side portion 60 against the stepped portion 72 of the small diameter portion 38a on the turbine 5 side. It is an operation control device.

[Operation] According to the above structure, in the clutch disengagement operation, the piston is quickly pushed back from the connecting position to the disengaging position by the elastic force of the spring.

[Embodiment] In FIG. 1, a front cover 1 is connected to a flywheel of an engine (not shown) and constitutes an input portion of a torque converter. The shell 3 of the pump impeller 2 is fixed to the outer periphery of the front end of the front cover 1. A turbine 5 is located between the front cover 1 and the pump impeller 2, and a stator 6 is located between the pump impeller 2 and the inner peripheral portion of the turbine 5.

The lockup clutch 70 basically comprises a clutch disc 10 and a piston 11. The clutch disc 10 is located between the front cover 1 and the turbine 5. The clutch disc 10 comprises a pair of annular input plates 12, an annular output plate 13 arranged between them, and a spring 14 connecting the input plate 12 and the output plate 13 in the circumferential direction. Piston 11
A facing 19 is attached to the outer peripheral portion of the.

The piston 11 is located between the clutch disc 10 and the front cover 1. A hydraulic chamber 25 is formed between the piston 11 and the front cover 1. Hydraulic chamber 25
Is connected to a hydraulic control mechanism (not shown) via an oil passage 26 provided in the inner peripheral portion of the front cover 1 and other oil passages (not shown). This hydraulic control mechanism releases the hydraulic pressure in the hydraulic chamber 25 when the ratio of the number of revolutions of the turbine 5 to the pump impeller 2 increases to a predetermined value, whereby the piston 11 presses the facing 19 against the front cover 1 and connects it. That is, the clutch is engaged, and the rotational force is transmitted from the front cover 1 to the clutch disc 10 via the facing 19.

The turbine shell 30 of the turbine 5 and the output plate 13 of the clutch disc 10 described above are both connected to the turbine hub 36. The turbine hub 36 has an output shaft 37.
An inner peripheral tubular portion 38 connected to (only the center line is shown), a flange 39 protruding outward in the radial direction from the end of the inner peripheral tubular portion 38 on the side of the stator 6, and a front surface from the outer peripheral portion of the flange 39. An outer peripheral tubular portion 40 protruding toward the cover 1 side is integrally provided, and a relatively wide space 41 is provided between the outer peripheral tubular portion 40 and the inner peripheral tubular portion 38 and on the front cover 1 side with respect to the flange 39. Are formed.

The turbine shell 30 is fixed to the surface of the flange 39 on the stator 6 side by rivets 43. A cylindrical portion 44 is integrally provided on the inner peripheral portion of the output plate 13, and the inner periphery of the cylindrical portion 44 is connected to the outer periphery of the outer peripheral cylindrical portion 40 via a spline so as to be movable in the axial direction. There is.

The inner peripheral side portion 60 of the piston 11 enters the space 41, and the cylindrical portion 61 extending from the inner peripheral edge thereof to the front cover 1 side is a small diameter portion 38a of the inner peripheral cylindrical portion 38 of the turbine hub 36 on the front cover 1 side. Slidably fitted to the outer peripheral surface of
The retard spring 6 is provided on the outer periphery of the tubular portion 61 between the annular spring receiver 63 held by the snap ring 71 at the end of the small diameter portion 38a on the front cover 1 side and the piston inner peripheral side portion 60.
2 is contracted to close the piston 11 in the shut-off direction (turbine 5
Side).

The inner peripheral side portion 60 of the piston 11 is inclined to enter the space 41, and the inner peripheral portion of the inner peripheral portion 60,
A cylindrical portion 61 that protrudes toward the front cover 1 is formed. The tubular portion 61 is slidably fitted to the outer circumference of the small diameter portion 38a of the inner tubular portion 38 of the turbine hub 36 and abuts against the step portion 72. A return spring 62 is provided around the cylindrical portion 61. An end of the return spring 62 on the flange 39 side is seated on the piston inner peripheral side portion 60, and an end of the return spring 62 on the opposite side is the inner cylindrical portion 38 of the turbine hub 36.
It is seated on the annular spring bearing 63 on the small diameter portion 38a.
In order to fix the annular spring receiver 63, the inner peripheral tubular portion 3
Reference numeral 8 projects toward the front cover 1 side from the tubular portion 61.

According to this structure, when the oil pressure in the oil pressure chamber 25 is released and the clutch 70 is engaged, the oil pressure chamber 2 becomes
The hydraulic pressure applied from the space 53 on the opposite side of 5 relatively increases, and the differential pressure is applied to the piston 11. When disengaging the clutch 70, hydraulic pressure is supplied to the hydraulic chamber 25. As a result, the piston 11 overcomes the sliding resistance of each part and moves to the turbine 5 side promptly and reliably, and the facing 19 is reliably released from the front cover 1. Therefore, the facing 19 does not remain in pressure contact with the front cover 1, and the clutch 70 is reliably disengaged.

[Effect of the Invention] As described above, according to the present invention, since the return spring 62 is provided as a means for promoting the disengagement operation of the lockup clutch, the half-clutch state is effectively prevented when the clutch is disengaged. And facing 19
Abnormal wear and seizure can be reliably prevented.

In addition, the space 4 inside the outer peripheral tubular portion 40 of the turbine hub 36
1, the piston inner peripheral side portion 60 and the return spring 62
Since it has been installed, it is compactly integrated, the return spring 62 has the smallest diameter, and it is lightweight and inexpensive. Since the step portion 72 is provided in the space 41, the amount of movement of the piston 11 in the disengagement direction can be optimally limited, and the next clutch engagement operation becomes sharp and reliable.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention. 1 ... Front cover, 5 ... Turbine, 10 ... Clutch disc, 11 ... Piston, 19 ... Facing, 36 ... Turbine hub, 62 ... Return spring.

Claims (1)

[Scope of utility model registration request] 1. A lockup clutch 70 is arranged between a front cover 1 which is an input part of a torque converter and a turbine 5 which is an output part of the torque converter.
A piston 11 driven axially by hydraulic pressure to have a facing 19 facing the inner surface of the front cover 1 on the outer peripheral portion, and a clutch having a torsion spring 14 connected to the outer peripheral portion radially inward of the facing 19 of the piston 11. The disk 10 is provided, and the turbine hub 36 has an inner peripheral tubular portion 38 and an inner peripheral portion of the turbine shell 30 that extends outward from an end portion of the turbine hub 36 opposite to the front cover 1 and rivets on a surface opposite to the front cover 1. The flange 39 fastened by 43 and the front cover 1 from the outer peripheral edge of the flange 39.
The inner peripheral tubular portion 38 is provided with the outer peripheral tubular portion 40 extending toward the side.
The inner peripheral side portion 60 of the piston 11 is housed in the space 41 between the outer peripheral tubular portion 40 and the outer peripheral tubular portion 40, and the tubular portion 44 extending from the inner peripheral edge of the output plate 13 of the clutch disc 10 to the turbine 5 side is provided in the turbine hub. A tubular portion 61 that is spline-fitted to the outer periphery of the outer peripheral tubular portion 40 and extends from the inner peripheral edge of the piston inner peripheral side portion 60 to the front cover 1 side is a small diameter portion of the turbine hub inner peripheral tubular portion 38 on the front cover 1 side. A return spring 62 is disposed between the annular spring receiver 63 held by a snap ring 71 and the piston inner peripheral side portion 60 at the end of the small diameter portion 38a slidably fitted on the front cover 1 side. The operation control device for the lock-up clutch, wherein the piston inner peripheral side portion 60 is pressed against the step portion 72 of the small diameter portion 38a on the turbine 5 side.