Device for preventing reverse gear buzzing in a manual transmission

Claim 1

In combination with a manual transmission for automotive vehicles including a transmission casing, a forward speeds unit provided with a plurality of synchromesh mechanisms and having shift heads for the forward speeds, a reverse unit provided with a selective sliding mesh mechanism of a reverse idler gear and having a reverse shift head, a shift-and-select lever shaft mounted in said transmission casing, an inner lever attached to said shift-and-select lever shaft and an interlocking plate relatively rotatably mounted to said shift-and-select lever shaft and holding said inner lever at its both ends, said interlocking plate serving to hold immovable at the neutral position the remaining shift heads other than one of said shift heads which is selected by the select operation of said inner lever; a device for preventing reverse gear buzzing comprising: a first front engaging member of the forward speed shift head adjacent to said reverse shift head for releasably engaging with said inner lever when said inner lever is selected into the reverse position; a first rear engaging member provided on said forward shift head adjacent to said reverse shift head; a second front and rear engaging members provided on said reverse shift head; first means for contacting with said interlocking plate at the reverse select position, moving said reverse shift head and said forward shift head with said inner lever by a predetermined amount in the reverse shifting direction and thereafter disengaging said inner lever from said forward speed shift head, said first means being provided on said reverse shift head; and second means for preventing said interlocking plate from abutting against said rear engaging member of said forward speed shift head when said forward speed shift head moves in the reverse shifting direction by said predetermined amount.