| 摘要 |
A telescopic shaft for motor vehicle steering assembled in a steering shaft of a motor vehicle and constructed by non-rotatably and slidably fitting a male shaft and a female shaft has a first torque transmission member and a second torque transmission member. The first torque transmission member is interposed, with an elastic body in between, between axial grooves formed in one line in an outer peripheral surface of the male shaft and an inner peripheral surface of the female shaft, respectively. The second torque transmission member is interposed between axial grooves formed in the other one line in the outer peripheral surface of the male shaft and in the inner peripheral surface of the female shaft, respectively. The elastic body has transmission member-side contact portions in contact with the first torque transmission member, groove surface-side contact portions separated in the circumferential direction with predetermined intervals and in contact with groove surfaces of the axial groove of the male shaft or the female shaft, and an urging portion for elastically urging a transmission member-side contact portion and a groove surface-side contact portion in the direction to separate them from each other. Rigidity of the transmission member-side contact portion and that of the groove surface-side contact portions are made different from each other. |
