Patent ID: 6227063
Filing Date: 2001-05-08
Classification: F16H,Y10T

Abstract:
An automatically operated transmission for a vehicle, comprising:a gear speed-changing mechanism including an input shaft, a clutch hub and a gear train;a synchromesh operating mechanism including a sleeve capable of shifting in an axial direction together with the clutch hub of said gear speed-changing mechanism and positioned at a neutral position in a neutral state of said gear speed-changing mechanism, and a synchronizer ring synchronizing with a predetermined gear of the gear train of said gear speed-changing mechanism by shifting of the sleeve from a shift put-in area to a synchronizing area, and completing the shifting of the sleeve in a piece-mesh area by freely rotating by the shifting of the sleeve from the synchronizing area to a push-apart area to allow meshing of the sleeve with the predetermined gear;an actuator for driving the sleeve of said synchromesh operating mechanism from the neutral position to a synchronization completing position via the shift push-in area, the synchronizing area, the push-apart area and the piece mesh area;a shifted amount detecting means for detecting a shifted amount of the sleeve to a set position located between the shift complete position and the neutral position by said actuator, or amount equivalent thereto; andcontrolling means for operating said actuator, when a fact that the sleeve of said synchromesh operating mechanism once reached to the shift completing position is retracted therefrom, without a driver's shifting operation, by a retracted amount smaller than a predetermined position in the piece meshing area is detected by said shifted amount detecting means, to re-shift the sleeve toward the shift completing position.