Patent ID: 6276224
Filing Date: 2001-08-21
Classification: F16H,Y10T

Abstract:
A shift control apparatus for a transmission, comprising:a plural sets of paired free-rotate gears mounted on a rotary shaft corresponding to speed-change gears;a plural sleeves each mounted on the rotary shaft not to be rotated circumferentially and to be shifted axialy thereof;a plural sets of paired synchronize rings disposed between each set of said free-rotate gears and each of said sleeve;an actuator for moving each of said sleeves; anda control means for controlling said actuator based on a speed-change command, said control means controlling said actuator so that said sleeve is driven by a first drive force upon starting of a speed-change operation, and is driven by a second drive force smaller than the first drive force at least during a first time period from a time before a balk point of said sleeve where said sleeve engages with said synchronize ring in a shift push-in operation,whereby a speed-change shift is changed by engaging said sleeve driven by said actuator with one of said synchronize rings and said free-rotate gears.