STEERING SYSTEM
First Claim
1. A steering system comprising:
- a steered shaft that makes a linear motion in a housing to steer steered wheels;
a driving wheel that is disposed in the housing, and that rotates about an axis extending parallel to an axis of the steered shaft in response to driving of a motor;
a ball nut screwed to the steered shaft via multiple balls, and supported via a bearing by an inner peripheral face of the housing so as to be rotatable relative to the inner peripheral face of the housing, the ball nut having a first end portion and a second end portion, a first flange being formed on an outer peripheral face of the first end portion and an inner-diameter-increased portion being formed in an inner peripheral face of the second end portion;
a driven wheel fitted on an outer periphery of the ball nut to transmit rotation of the driving wheel to the ball nut; and
a hollow connection member including a connection portion inserted in and connected to the inner-diameter-increased portion, and a second flange, whereinthe bearing and the driven wheel are held between the second flange and the first flange in an axial direction of the steered shaft when the connection portion is connected to the inner-diameter-increased portion.
1 Assignment
0 Petitions
Accused Products
Abstract
In an electric power steering system, rotation of a motor is transmitted to a rack shaft via a drive pulley, a belt, a driven pulley and a ball nut. A ball bearing and the driven pulley are fitted to the outer periphery of the ball nut. A flange is formed at a first end portion of the ball nut, and an internal thread portion is formed at a second end portion of the ball nut. An external thread member is connected to the internal thread portion. The external thread member has an external thread portion and a flange. By fastening the external thread portion to the internal thread portion, the ball bearing and the driven pulley are held between the two flanges.
21 Citations
7 Claims
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1. A steering system comprising:
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a steered shaft that makes a linear motion in a housing to steer steered wheels; a driving wheel that is disposed in the housing, and that rotates about an axis extending parallel to an axis of the steered shaft in response to driving of a motor; a ball nut screwed to the steered shaft via multiple balls, and supported via a bearing by an inner peripheral face of the housing so as to be rotatable relative to the inner peripheral face of the housing, the ball nut having a first end portion and a second end portion, a first flange being formed on an outer peripheral face of the first end portion and an inner-diameter-increased portion being formed in an inner peripheral face of the second end portion; a driven wheel fitted on an outer periphery of the ball nut to transmit rotation of the driving wheel to the ball nut; and a hollow connection member including a connection portion inserted in and connected to the inner-diameter-increased portion, and a second flange, wherein the bearing and the driven wheel are held between the second flange and the first flange in an axial direction of the steered shaft when the connection portion is connected to the inner-diameter-increased portion. - View Dependent Claims (3, 5, 6, 7)
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2. The steering system according to claim I, wherein:
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the connection portion is an external thread portion, and the inner-diameter-increased portion is an internal thread portion; and when the external thread portion is screwed into the internal thread portion, the ball nut and the connection member are connected to each other and the bearing and the driven wheel are held between the first flange and the second flange in the axial direction. - View Dependent Claims (4)
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Specification