Importance

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Abstract

In order to solve a problem of an electric power steering device of an automobile that the steering feeling is deteriorated by dragging the inactive electric motor if a steering member is operated at a small angle to leave an electric motor inactive while the automobile is running straight, the present invention provides a joint for jointing the rotary shaft of a steering assisting electric motor and a worm shaft of a reduction mechanism, comprising a first member rotating integrally with the rotary shaft; a second member rotating integrally with the worm shaft; and an elastic member for coupling the two members in a torque transmittable manner. The elastic member has a relatively small elastic modulus according to the state that the torsion angle between the first and second members is small. Accordingly, the structure and characteristics thereof lead to a better operationality of the steering member.

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First Claim