Reducer of electric power auxiliary steering apparatus
View Patent ↗Disclosed is a reducer of an electric power auxiliary steering apparatus. According to embodiments of the present invention, impulse noise of a worm shaft bearing caused by fluctuation of a worm shaft can be reduced, and strength of a damping member in a direction toward a worm wheel and an opposite direction thereto is lower than that in other directions, so that the fluctuation of the worm shaft can be more effectively alleviated.
1. A reducer of an electric power auxiliary steering apparatus, comprising:
a damping member comprising an inner race and an outer race, wherein the inner race is mounted on an outer peripheral surface of a worm shaft bearing coupled to one end of a worm shaft engaged with a worm wheel, a motor shaft being coupled to the other end of the worm shaft, and the outer race is connected with connection parts formed at one portion orienting toward the worm wheel and an opposite portion thereto, respectively, of an outer peripheral surface of the inner race, provided around the inner race, and supported on an inner surface of a gear housing; and
a bush member provided between the inner race and the outer race, and formed with through holes through which the connection parts pass, respectively, in a direction toward the worm wheel and an opposite direction thereto.
2. The reducer of claim 1 , wherein support parts are formed to protrude in a radially inward direction from one portion orienting toward the worm wheel and an opposite portion thereto, respectively, of an inner peripheral surface of the inner race to support the outer peripheral surface of the worm shaft bearing.
3. The reducer of claim 2 , wherein protrusions are formed to protrude in the radially inward direction from inner peripheral surfaces of the support parts, respectively, and are spaced apart from each other in a circumferential direction.
4. The reducer of claim 3 , wherein concave recesses spaced apart from each other in the circumferential direction are formed both at one portion orienting toward the worm wheel and an opposite portion thereto of an outer peripheral surface of the outer race of the damping member, or either at the one portion or the opposite portion.
5. The reducer of claim 4 , wherein at one portion of the damping member orienting toward a direction opposite to the worm wheel, a through hole is formed through the outer race, the connection part, the inner race, and the support part.
6. The reducer of claim 5 , further comprising:
a pressing control member that is coupled to the gear housing, and presses the outer peripheral surface of the worm shaft bearing to resiliently support the worm shaft bearing in a direction orienting toward the worm wheel, compensating for separation between the worm shaft and the worm wheel,
wherein the pressing control member comprises:
a support member passing through the through hole to support the outer peripheral surface of the worm shaft bearing;
a resilient member coupled at one end thereof to the support member; and
an adjusting member coupled to the gear housing, wherein the other end of the resilient member is supported at an inside of the adjusting member.