Importance

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Abstract

Provided is a steering device which can be reduced in size and weight and easily adapted even to a vehicle with a small engine room, such as a front-wheel-drive car. The steering device includes: a relay rod rotatably supported with respect to a gear casing and having a spiral ball rolling groove formed therein; an input shaft to which rotation of a steering shaft is transmitted; a rotation transmitting means for converting rotation of the input shaft into rotational movement of the relay rod and for allowing the relay rod to move in an axial direction thereof; a screw nut threadedly engaged with the ball rolling groove of the relay rod through an intermediation of a large number of balls and fixed to the gear casing, for allowing the relay rod to move in accordance with rotation of the relay rod in the axial direction thereof; a pair of tie rods for moving steerable wheels in accordance with axial movement of the relay rod; and a pair of spherical bearings for transmitting the axial movement of the relay rod to the tie rods without transmitting the rotational movement of the relay rod to the tie rods.

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First Claim