Gear-change apparatus for vehicle transmission

In a gear-change apparatus for a vehiculr transmission having a plurality of forward gear trains each established through an associated synchronizing mechanism, and a reverse gear train established by axial movement of a shaft of a reverse idler gear, an improvement comprising;

• a one-way cam mechanism having a first cam integrally formed on a reverse shift fork for shifting said reverse idler gear from an inoperative position to an engaged reverse gear train position thereof and a pivotable second cam disposed on a forward shift fork for establishing one forward gear train, said first and second cams being arranged such that when said reverse shift fork if moved in a direction which causes said first cam to engage said second cam said forward shift fork is shifted by a predetermined small stroke sufficient for the synchronizing mechanism of forward gear corresponding to said forward shift fork to effect only the synchronizing action thereof while said reverse shift fork is moving from the inoperative postition of said reverse idler gear to a position immediately before the engaged reverse gear train position of said reverse idler gear, said second cam effecting a load relieving action when said reverse shift fork is moved to disengage said first and second cams so as to avoid said reverse shift fork encountering any resistance offered by said forward shift fork.

A gear-change apparatus for a transmission having a plurality of forward gear trains engaged through an associated synchronizing mechanism and a reverse gear train engaged by axial movement on a shaft of a reverse idler gear, comprising:

• a spring biased driven cam pivotably disposed on a pivot shaft on a forward shift fork for engaging a forward gear train, with said driven cam biased against a stopper pin;
• a driver cam disposed on and integral with a reverse shift fork, said driven cam and said driver cam positioned with respect to each other such that as the engagement of the reverse gear train is initiated upon movement of the reverse shift fork from a neutral position, said driver cam engages sad driven cam and thereby displaces said forward shift fork by a predetermined small stroke, with said cams remining in contact during the engagement of the reverse gear train, said driven cam pivoting against said driver cam as the reverse shift fork moves back to the neutral position.