Lockup clutch for torque converter
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 21, 2003
Grant Date -
N/A
app pub date -
Nov 1, 2000
filing date -
Nov 11, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A lockup clutch for a torque converter includes a pump extension, a receiving plate connected to the pump extension defining a hydraulic pressure chamber communicating with a portion between a pump impeller and a turbine impeller, a pressing plate opposed to the receiving plate for movement toward and away from the receiving plate, an annular friction clutch plate interposed between the receiving plate and the pressing plate and connected to the turbine impeller, a return spring for biasing the pressing plate in a retracting direction, and an escape bore permitting the inside and outside of the receiving plate to communicate with each other on the side of an inner periphery of the friction clutch plate. When the rotational speed of the pump impeller is increased to a value equal to or higher than a predetermined value, the pressing plate clamps the friction clutch plate in cooperation with the receiving plate under the action of a centrifugal hydraulic pressure within the hydraulic pressure chamber. Thus, the lockup clutch needs no special control but has a simple structure.
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