Ball return means with a fastening sleeve which can be mounted axially
First Claim
Patent Images
1. A power steering system comprising:
- an axially-movable rack having a threaded spindle formed thereon;
a ball nut that is mounted in a bearing so as to be rotatable in a housing, wherein the ball nut is engaged with the threaded spindle formed on the axially-movable rack, wherein an inside of the ball nut comprises a ball screw thread on which balls are configured to roll;
a servomotor that drives the axially-movable rack via the ball nut; and
an external ball return comprising a deflector and sleeve separate from the ball nut, the external ball return configured to form a return channel external to the ball nut and connect a beginning of the ball screw thread to an end of the ball screw thread to allow endless circulation of the balls.
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Abstract
A power steering system for a motor vehicle may include a servomotor, which drives an axially-movable rack via a ball nut. The ball nut may be mounted in a bearing such that the ball nut can be rotated in a housing. The ball nut engages with a threaded spindle formed on the axially-movable rack and has a ball screw thread on an inside thereof for balls to roll on. An external ball return means may connect a beginning of the ball screw thread to an end of the ball screw thread to allow endless circulation of the balls. A deflector and a sleeve may form a return channel of the ball return means.
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Citations
11 Claims
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1. A power steering system comprising:
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an axially-movable rack having a threaded spindle formed thereon; a ball nut that is mounted in a bearing so as to be rotatable in a housing, wherein the ball nut is engaged with the threaded spindle formed on the axially-movable rack, wherein an inside of the ball nut comprises a ball screw thread on which balls are configured to roll; a servomotor that drives the axially-movable rack via the ball nut; and an external ball return comprising a deflector and sleeve separate from the ball nut, the external ball return configured to form a return channel external to the ball nut and connect a beginning of the ball screw thread to an end of the ball screw thread to allow endless circulation of the balls. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification