One-way clutch having lock-up function

Details One-way clutch having lock-up function One-way clutch having lock-up function

1999-07-09

2001-02-13

Bonck, Rodney H. (Department: 3681)

192 clutches and power-stop control

Clutches

Automatic

C192S045000, C192S085060

Reexamination Certificate

active

06186298

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an improvement in a one-way clutch used in a transmission, particularly an automatic transmission of a motor vehicle, an agricultural machine, a construction machine, an industrial machine and the like. More particularly, the present invention relates to a one-way clutch having a lock-up function.
2. Related Background Art
A conventional one-way clutch used in an automatic transmission has an outer race and an inner race which are rotated relative to each other, and sprags or rollers for transmitting torque between the outer race and the inner race are engaged by a cam surface provided on a track surface of the outer race or the inner race, thereby transmitting rotational torque only in one direction. Further, such a one-way clutch is idly rotated in reverse direction.
Such a one-way clutch cannot be used in case that rotation must be transmitted in both of two directions. In such cases, by combining the one-way clutch with a multi plate clutch such as a multi-plate frictional engaging device for effecting lock-up, a clutch is designed so that a rotary member is idly rotated only in one direction or the rotary member is prevented from being idly rotated in both of two directions, on demand.
However, in such an arrangement, the function for effecting idle rotation only in one direction and the function for preventing idle rotation in both directions must be shared with two members, with the result that there arise problems such as an increase in the number of parts, complexity, bulkiness, an increase in weight and an increase in cost.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a one-way clutch having a lock-up function, which has both a function for effecting idle rotation only in one direction and a function for preventing rotation in both directions, in order to solve problems such as an increase in the number of parts, complexity, bulkiness, an increase in weight and an increase in cost.
To achieve the above object, the present invention provides a one-way clutch having a lock-up function, comprising an outer race, an inner race radially spaced apart from the outer race and disposed within the outer race concentrically for relative rotation, a cam surface provided on an inner peripheral surface of the outer race or an outer peripheral surface of the inner race, a track surface provided on the outer peripheral surface of the inner race or the inner peripheral surface of the outer race in a confronting relationship to the cam surface, a plurality of roller members disposed between the outer race and the inner race and adapted to transmit torque between the outer race and the inner race, springs for biasing the roller members toward one circumferential direction, a side plate for holding the roller members and the springs at predetermined intervals along a circumferential direction, and a control member for acting on the roller members to effect lock-up control, and wherein the control member controls the one-way clutch to lock-up the one-way clutch in both directions or one direction by urging the roller members radially against the outer peripheral surface of the inner race or the inner peripheral surface of the outer race to frictionally engage the former with the latter or by releasing the roller members.
According to the present invention, when a torque transmitting member normally fixed or secured only in one direction is urged against the inner race, a friction force is generated at a contact area between the torque transmitting member and the inner race, with the result that the torque transmitting member follows the rotational direction of the inner race regardless of the urging force of the spring, thereby locking-up the one-way clutch.


REFERENCES:
patent: 1152075 (1915-08-01), Buschmann
patent: 1735125 (1929-11-01), Miller
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patent: 3084774 (1963-04-01), Liang
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patent: 5152726 (1992-10-01), Lederman
patent: 5638929 (1997-06-01), Park
patent: 6068097 (2000-05-01), Kurita

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