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US 8,282,525 B2Granted
Arrangement for control of a continuosly variable transmission
AssigneeTorotrak (Development) Limited
InventorRobert Andrew Oliver
Life of this patent
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AssigneeTorotrak (Development) Limited
InventorRobert Andrew Oliver
Estimating the term…
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.
An arrangement for controlling a variator, the arrangement comprising a user operable ratio control part, a device for operatively coupling the ratio control part to a movable torque transfer part of the variator to enable the user to exercise control over the variator ratio, and a torque release device operable by the user to decouple the ratio control part from the movable torque transfer part, wherein the operative coupling of the user operable ratio control part to the movable torque transfer part is through a device comprising a comparator constructed and arranged to compare the position of the movable torque transfer part to the position of the ratio control part and to modulate a force applied to the movable torque transfer part based upon the outcome of the comparison.
A continuously variable transmission (CVT) comprising an arrangement and a variator, wherein the arrangement is for controlling the variator, the arrangement comprising a user operable ratio control part, a device for operatively coupling the ratio control part to a movable torque transfer part of the variator to enable the user to exercise control over the variator ratio, and a torque release device operable by the user to decouple the ratio control part from the movable torque transfer part, and wherein the operative coupling of the user operable ratio control part to the movable torque transfer part is through a device comprising a comparator constructed and arranged to compare the position of the movable torque transfer part to the position of the ratio control part and to modulate a force applied to the movable torque transfer part based upon the outcome of the comparison.
Dependencies are inferred from the claim text.