Variable mechanical advantage torque arm

摘要

A variable mechanical advantage/variable effective length torque arm assembly (100) for a synchronized transmission is provided. The torque arm assembly comprises a substantially rigid body (102) fixedly mounted to a shift shaft (36) at one end (104) thereof for axial and rotational movement therewith. The body is provided with an axially extending elongated slot (106) in which a pivot pin (124) is received for pivotably attaching an axially movable control rod (22) to the body of the torque arm assembly. A biasing spring (134) bias the pivot pin to a first end of the slot closer to the axis of the shift shaft to define a first effective length (138) of the torque arm assembly which biasing force may be overcome by a sufficient resistance to rotation of the shift shaft (36) allowing the pivot pin to move away from the axis of the shift shaft to define a second effective length (140) of the torque arm assembly greater than the first effective length.