Importance

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Abstract

In a telescopic shaft for vehicle steering which is installed in a steering shaft of a vehicle and in which a male shaft and a female shaft are fitted to each other to be unrotatable and freely slidable, a spherical member (7) is interposed between at least one of axial grooves (3, 5) which are respectively formed on the outer peripheral surface of the male shaft (1) and on the inner peripheral surface of the female shaft (2) through an elastic member (9), and a columnar member (8) is interposed between at least another of axial grooves (4, 6) which are respectively formed on the outer peripheral surface of the male shaft (1) and on the inner peripheral surface of the female shaft (2). The elastic member (9) comprises a contact portion (9a) on the spherical member side which is in contact with the spherical member, a contact portion (9b) on the groove surface side which is separated from the contact portion (9a) on the spherical member side by a predetermine distance in a substantially circumferential direction and, at the same time, in contact with the groove surface of the axial groove of the male shaft or the female shaft, and a biasing portion (9c) for elastically biasing the contact portion on the spherical member side and the contact portion on the groove surface side in a direction in which both the contact portions are separated from each other.

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First Claim