Patent ID: 8276703

Claim:
A chain adjustment apparatus for a motorcycle, said motorcycle comprising a rear fork attached to a vehicle body or an engine so as to freely swing up and down, said rear fork supporting a rear wheel at a rear end portion thereof via a rear wheel axle; and a chain which transmits a driving force of the engine to a driven sprocket of the rear wheel; said chain adjustment apparatus comprising: an end piece member attached to said rear end portion of the rear fork; a portion of said end piece member having an elongated opening and an adjustment recess formed therein; and an adjustment member fitted in the adjustment recess so as to slidably move in forward and backward directions therein; wherein: the rear wheel axle extends through the elongated opening and the adjustment member; tension of the chain is adjusted by adjusting a position of the adjustment member to cause the rear wheel axle to be moved while being guided by the elongated opening; the adjustment member has an axle hole formed therein through which the rear wheel axle is extended, said adjustment member being operable to move in an axial direction of the rear wheel axle, said adjustment member includes a projecting member having an inner side face including a substantially V-shaped projecting slope whose vertically central portion projects toward the inner side of the vehicle body, said inner side face facing toward an inner side of the vehicle body, and a recessed member having a substantially V-shaped recessed slope above and below the elongated opening, and wherein said adjustment member is formed by the projecting member and the recessed member fitted together such that the substantially V-shaped projecting slope and the substantially V-shaped recessed slope are brought into sliding contact with each other, and wherein the adjustment member fits into the adjustment recess having a substantially C-shaped cross section which is formed in a portion of the end piece member including the elongated opening.