Arrangement for control of a continuosly variable transmission
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United States of America Patent
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Oct 9, 2012
Grant Date -
Dec 24, 2009
app pub date -
May 11, 2007
filing date -
Jun 8, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An arrangement for controlling a variator in a continuously variable transmission such as a vehicle transmission is described. The arrangement comprises a user operable ratio control part such as a lever and a device for operatively coupling the ratio control part to a movable torque transfer part of the variator such as its rollers. The coupling device is, in the particular embodiment described, a hydro-mechanical arrangement. By moving the user operable ratio control part, the user exercises control over the variator ratio. In accordance with the invention the arrangement further comprises a torque release device such as a valve which is operable by the user to decouple the ratio control part from the movable torque transfer part. By doing so, the torque release device offers functionality which is in some ways analogous to that of a clutch in a conventional stepped ratio vehicle transmission.
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