Creep control for a continuously variable transmission

F - Mech Eng,Light,Heat,Weapons – 16 – D

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F16D 43/00 (2006.01) F16H 61/662 (2006.01)

Patent

CA 2004186

1001 - 32 CREEP CONTROL FOR A CONTINUOUSLY VARIABLE TRANSMISSION ABSTRACT OF THE DISCLOSURE A continuously variable transmission has a fixed pulley piece and has a movable pulley piece which is supported for movement toward and away from the fixed pulley piece, the width of a groove between the pulley pieces being increased or decreased in order to increase or decrease the radius of rotation of a belt looped around a driving side pulley and a driven side pulley which include the fixed and movable pulley pieces to thereby vary a belt ratio. A hydraulic clutch is engaged and disengaged under control of a clutch pressure in order to vary a driving force output by the continuously variable transmission, and a control arrangement controls the hydraulic clutch so that creep caused by slippage of the hydraulic clutch in a hold mode during a reverse gear operation of the continuously variable transmission is larger than creep caused by slippage of the hydraulic clutch in a hold mode during forward gear operation of the continuously variable transmission.

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