Steering system
First Claim
1. A steering system comprising:
- a motor;
a steered shaft that is reciprocally movable in an axial direction;
a ball screw nut threadably engaged with the steered shaft via a plurality of balls; and
a speed reducer that has a driven pulley into which the ball screw nut is inserted so that the driven pulley is fixed to an outer peripheral surface of the ball screw nut, a drive pulley fixed so as to be rotatable together with a rotary shaft of the motor, and a belt wound between the driven pulley and the drive pulley, whereinthe outer peripheral surface of the ball screw nut is provided with a groove that extends along a circumferential direction of the ball screw nut, and an inner peripheral surface of the driven pulley is provided with a lug portion to be fitted with the groove.
1 Assignment
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Accused Products
Abstract
A steering system with a reduced number of parts is provided. A driven pulley has a radially outer portion, a radially inner portion, and a connection portion that connects the radially outer portion and the radially inner portion to each other. The radially inner portion is provided with a plurality of slits at equal intervals in the circumferential direction. A plurality of retention portions are provided at portions of the radially inner portion between the slits. Lug portions are provided on the inner surface of the distal ends of the retention portions. A groove is provided in the outer peripheral surface of a ball screw nut. The lug portions of the retention portions are fitted with the groove of the ball screw nut.
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Citations
8 Claims
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1. A steering system comprising:
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a motor; a steered shaft that is reciprocally movable in an axial direction; a ball screw nut threadably engaged with the steered shaft via a plurality of balls; and a speed reducer that has a driven pulley into which the ball screw nut is inserted so that the driven pulley is fixed to an outer peripheral surface of the ball screw nut, a drive pulley fixed so as to be rotatable together with a rotary shaft of the motor, and a belt wound between the driven pulley and the drive pulley, wherein the outer peripheral surface of the ball screw nut is provided with a groove that extends along a circumferential direction of the ball screw nut, and an inner peripheral surface of the driven pulley is provided with a lug portion to be fitted with the groove. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification