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AssigneeNsk Ltd.
InventorsShinya Nakatani, Atsushi Yokouchi, Hiroshi Sato, Kazunori Takahashi, Yoshinori Takahashi, Seiichi Moriyama
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The invention provides a telescopic shaft for vehicle steering installed in a vehicle steering shaft. A male shaft and a female shaft are non-rotatably and slidably fitted to each other and an outer peripheral portion of the male shaft and an inner peripheral portion of the female shaft come in contact with each other to transmit a torque during rotation. A grease composition which has an apparent viscosity of 400 to 750 Pa·s (25° C.) at a shear rate of 10 sec−1 as defined in JIS K2220 is enclosed in a gap between the outer peripheral portion of the male shaft and the inner peripheral portion of the female shaft. This telescopic shaft for vehicle steering does not need a new process for the male and female shafts, which is a cause of increase of cost. In addition, improvement in durability, reduction of resistance and stick-slip resistance are achieved.
A telescopic shaft for vehicle steering which is installed in a vehicle steering shaft and in which a male shaft and a female shaft are non-rotatably and slidably fitted to each other and an outer peripheral portion of the male shaft and an inner peripheral portion of the female shaft come in contact with each other to transmit a torque during rotation,
A grease composition which is enclosed in a gap between an outer peripheral portion of a male shaft and an inner peripheral portion of a female shaft of a telescopic shaft for vehicle steering which is installed in a vehicle steering shaft and in which the male shaft and the female shaft are non-rotatably and slidably fitted to each other and the outer peripheral portion of the male shaft and the inner peripheral portion of the female shaft come in contact with each other to transmit a torque during rotation,
Dependencies are inferred from the claim text.