Belt type driveline and rack assist type electric power steering apparatus having the same

摘要

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.

主权项

1. A belt 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 a support member 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, wherein the support member includes: a fixed part embedded in and integrally fixed to an inner side of the nut pulley; and an elastically transformable part protruding outward from the fixed part at the inner peripheral surface of the nut pulley, wherein the elastically transformable part includes: side edges connected to the fixed part extending in a radial direction, portions of the side edges being curved in a circumferential direction, and connected to each other; and a radial protrusion being formed at a region at which the side edges of the elastically transformable part are connected to each other.