Patent ID: 7559266

Claim:
A telescopic shaft comprising: a male shaft having a noncircular outer peripheral shape; a female shaft having a noncircular inner peripheral shape, being outwardly fitted to an outer periphery of the male shaft so as to move relative thereto in an axial direction and transmit a rotational torque; an inclined gap formed at a gap between the noncircular outer periphery and the noncircular inner periphery, and changing an interval therebetween at a predetermined inclination; an inclined sleeve portion inserted to the inclined gap, and always coming into contact with both the noncircular inner periphery of the female shaft and the noncircular outer periphery of the male shaft; and an urge sleeve portion capable of an elastic deformation, inserted to the gap between the noncircular outer periphery and the noncircular inner periphery, and urging the inclined sleeve portion from a side of a maximum gap portion of the inclined gap toward a side of a minimum gap portion thereof to apply a preload.