Synchronizer

Abstract

A synchronizer (20) for a speed transmission which can be used aboard a vehicle, in particular a motorcycle, allows the possibility of selecting each gear in any moment, by guaranteeing as additional feature that of being able to exploit the effect of the exhaust brake independently from the engaged gear and independently from the motor regime, and it comprises: a primary shaft (8); a bell-shaped member (1) assembled on said primary shaft (8) having inside a friction cylindrical surface (18); a supporting element (2), revolvingly mounted on said primary shaft (8) and housed within said bell-shaped member (1); at least a shoe (3) having a friction profile localised within the outer edge of the supporting element (2) and faced towards the friction cylindrical surface (18) of the bell-shaped member (1), jointed to said supporting element (2) by a pair of arms (4) in an articulated quadrilateral configuration; and means for translating said shoe (3) by rotating said arms (4) both in clockwise and counterclockwise direction, by causing the projection of the shoe (3) above the outer edge of the supporting element, (2) the interference of an end of the shoe (3) with said friction cylindrical surface (18) of the bell-shaped member (1), by causing a jamming thereof.

Dependencies are inferred from the claim text.