Patent ID: 8789648

Claim:
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.