Ball/ramp system for torque transmission
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United States of America Patent
Stats
-
Jul 28, 1981
Issued Date -
N/A
app pub date -
Jan 22, 1979
filing date -
Jul 21, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A ball/ramp force producing system is provided for use in infinitely variable ratio torque transmissions of the type which transmit torque by means of rolling friction contact between pairs of traction surfaces. The ball/ramp system applies a thrust force to a pair of conical traction elements to force the elements into frictional engagement with their respective other traction surfaces. The system includes a collar assembly splined to a support shaft with conical traction elements mounted on the shaft on each side of the collar assembly. Complementary helical ball/ramps are formed on each side of the collar assembly and on the respective cone bases with force transmitting balls located in the ramp sets. Rotation of the collar assembly or the traction elements with respect to one another causes the traction elements to advance in opposite axial directions along the shaft to initiate and maintain engagement between the respective traction surface pairs. The thrust force generated by the ball/ramp system is proportional to the torque transmitted by the transmission.
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