Steering device of vehicle
According to the present embodiments, it is possible to mitigating noise by preventing degradation of lubrication performance due to mixture of greases with different properties in a gear housing.
1 . A vehicle steering device, comprising:
a worm shaft including a gear portion having a worm gear engaged with a worm wheel, a first end portion coupled to a worm housing by a first bearing and connected with a motor, and a second end portion coupled to the worm housing by a second bearing; and
a spacer positioned between the gear portion and the second bearing to prevent a grease applied to the worm gear from being introduced to the second bearing,
wherein the spacer includes a wing portion protruding from a surface of the spacer facing the worm gear,
wherein the wing portion includes an obliquely angled portion extending in a direction toward the worm gear, such that a gap is defined between the obliquely angled portion and an outer circumferential surface of the worm shaft, and a distance across the gap increases along the direction toward the worm gear.
2 . The vehicle steering device of claim 1 , wherein the spacer is shaped as a ring and is coupled to the second end portion.
3 . The vehicle steering device of claim 1 , wherein the spacer has a receiving portion for receiving the grease between the spacer and an outer circumferential surface of the worm shaft.
4 . The vehicle steering device of claim 3 , wherein the spacer includes a disc portion having one surface facing the worm gear and a ring portion extending from an outer end of the disc portion to the worm gear so that an inner surface faces the outer circumferential surface of the worm shaft.
5 . The vehicle steering device of claim 4 , wherein the ring portion increases in diameter toward the worm gear.
6 . The vehicle steering device of claim 5 , wherein an outer surface of the ring portion is spaced apart from the worm housing.
7 . The vehicle steering device of claim 4 , wherein the spacer is rotated together with the worm shaft.
8 . The vehicle steering device of claim 7 , wherein the second end portion has a diameter smaller than that of the gear portion to form a stepped portion on the outer circumferential surface of the worm shaft, and wherein the spacer includes a coupling portion coupled between the stepped portion and an inner ring of the second bearing.
9 . The vehicle steering device of claim 8 , wherein the wing portion is positioned in the receiving portion.
10 . The vehicle steering device of claim 8 , wherein the wing portion is formed over the coupling portion, the disc portion, and the ring portion.
11 . The vehicle steering device of claim 8 , wherein a plurality of wing portions spaced apart from each other in a circumferential direction are provided.
12 . The vehicle steering device of claim 1 ,
wherein the spacer is shaped as a ring, with an outer end of the spacer being adjacent to the worm housing and the second end portion of the worm shaft being coupled through an inner end of the spacer, and
an area where the worm shaft and worm wheel engage and an area where the second bearing rotates are spatially separated by the spacer.
13 . The vehicle steering device of claim 1 , wherein the spacer comprises:
a coupling portion having the second end portion penetrating therethrough and coupled between an inner ring of the second bearing and the second end portion of the worm shaft;
a disc portion connected to the coupling portion and extending toward the worm housing and the worm gear; and
a ring portion extending from an outer end of the disc portion toward the worm housing and the worm gear, an outer end of the ring portion is adjacent to the worm housing.
14 . The vehicle steering device of claim 1 , further comprising a damper axially coupled between the second bearing and the worm housing to axially support the second end portion of the worm shaft.