Rotary torque transmission apparatus for four-wheel drive vehicles

摘要

A rotary torque transmission apparatus for a 4-wheel drive vehicle in which a rotary torque of a worm wheel of 4-wheel drive vehicle provided with a reciprocably movable fork shaft, to which a shaft fork for moving a 2-4 wheel change over slider to and fro is fixed, is transmitted to an output shaft via a torsion spring, wherein the worm wheel driven by a motor is disposed on an output shaft supported by a casing so as to be rotatable relative to the output shaft; and a pair of rotary plates so arranged as to be rotatable together with the worm wheel is disposed inside the torsion spring arranged between a pair of fixed plates fixed to the output shaft in such a way that each end of the torsion spring is retained between one rotary plate and one fixed plate disposed on the opposing side to each other, respectively.