BELT TYPE DRIVELINE AND RACK ASSIST TYPE ELECTRIC POWER STEERING APPARATUS HAVING THE SAME
First Claim
Patent Images
1. A belt type driveline comprising:
- a ball nut engaged with a rack bar and configured to slide the rack bar;
a nut pulley engaged with an outer peripheral surface of the ball nut and configured to transfer a driving force of a belt; and
support members formed in an inner peripheral surface of the nut pulley and configured to add a supporting force while being elastically transformed when the nut pulley is engaged with the ball nut.
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Abstract
Disclosed are a belt type driveline and a rack assist type electric power steering apparatus including the belt type driveline, which improve power transmission efficiency and increases durability by preventing spinning with no traction of a ball nut and a nut pulley due to a slip between the ball nut and the nut pulley in an operation of a belt by a motor, and provide a user with convenient steering by minimizing vibration and noise transferred through a rack bar, the ball nut, the nut pulley, etc., when the rack bar slides while the nut pulley and the ball nut rotate.
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Citations
12 Claims
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1. A belt type driveline comprising:
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a ball nut engaged with a rack bar and configured to slide the rack bar; a nut pulley engaged with an outer peripheral surface of the ball nut and configured to transfer a driving force of a belt; and support members formed in an inner peripheral surface of the nut pulley and configured to add a supporting force while being elastically transformed when the nut pulley is engaged with the ball nut. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A rack assist type electric power steering apparatus, comprising:
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a torque sensor for outputting an electrical signal proportionate to steering torque; an Electronic Control Unit (ECU) for generating a control signal based on the electrical signal transferred from the torque sensor; a motor for generating auxiliary steering power based control signal transferred from the ECU; and a belt type driveline for transferring auxiliary power generated in the motor to a rack bar, wherein the belt type driveline comprises; a ball nut engaged with the rack bar and configured to slide the rack bar; a nut pulley engaged with an outer peripheral surface of the ball nut and configured to transfer a driving force of a belt; and support members formed in an inner peripheral surface of the nut pulley and configured to add a supporting force while being elastically transformed when the nut pulley is engaged with the ball nut.
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Specification