CN201305106Y

CN201305106Y - A dustproof structure of bicycle guide sprocket

Info

Publication number: CN201305106Y
Application number: CNU2008202101558U
Authority: CN
Inventors: 张仓意
Original assignee: TOKEN PRODUCTS Inc
Current assignee: TOKEN PRODUCTS Inc
Priority date: 2008-11-21
Filing date: 2008-11-21
Publication date: 2009-09-09
Anticipated expiration: 2018-11-21

Abstract

Disclosed is a dustproof structure of bicycle guide sprocket; wherein, the bicycle guide sprocket comprises a bearing and a dustproof cover; the bearing is fixed in the center of the bicycle guide sprocket; the dustproof cover is respectively and axially covered on the opening end of the bearing; the dustproof over is provided with a hollow shaft part; the hollow shaft part is correspondingly nested in the bearing; a dustproof part is transversely and annularly arranged on the outer end of the hollow shaft part; besides, a concave ring is formed on the annular opening of the dustproof part; an annular ring is also arranged in the concave ring; meanwhile, the annular ring is adhered on the peripheral surface of the bearing; thereby, water and sand stones are prevented from falling in, so as to improve the speed change smoothness of rear transmission.

Description

Bicycle is led the dustproof construction of sprocket gear

Technical field

The utility model is the dustproof construction that a kind of bicycle is led sprocket gear.

Background technology

See also Fig. 1, it is the assembled sectional view that known bicycle is led sprocket gear, the place had provided a centre hole 2 in the middle of this bicycle was led sprocket gear 1, also be provided with a bearing 3 in this centre hole 2, and be hubbed on the bicycle speed-varying unit by this bearing 3, and the open end in this bearing 3 axially is covered with a cover of dust 4 respectively, and this cover of dust 4 is to have a hollow shaft 5, be sheathed on relatively in this bearing 3 by this hollow shaft 5, also be provided with a dustproof portion 6 in these hollow shaft 5 outer end lateral loops, should dustproof portion 6 be covered on relatively this bearing 3 distolateral on, in addition, should have a parallel predetermined gap 7 on the radial end face of dustproof portion 6 relative these bearings 3, and this gap 7 is to extend on these dustproof portion 6 outer peripheral edges.

Known bicycle is led sprocket gear and have parallel predetermined gap 7 on the radial end face of these dustproof portion 6 relative these bearings 3, this gap 7 is when rainy, rainwater is carried sandstone easily secretly and is splashed in this gap 7, the rotation of this bearing 3 is affected, therefore, the known sprocket gear 1 real essentiality that remains to be improved of leading.

The utility model content

The utility model is the dustproof construction that a bicycle is led sprocket gear, wherein, it is to include a bearing and cover of dust that this bicycle is led sprocket gear, this bicycle is led the sprocket gear center and is installed with this bearing, this bearing center also is provided with an axis hole, and the open end in this axis hole axially is covered with this cover of dust respectively, and this cover of dust has a hollow shaft, be sheathed on relatively in this bearing by this hollow shaft, the formation that also extends radially outwardly in this hollow shaft outer end contains the dustproof portion of covering whole bearing, be somebody's turn to do between dustproof portion and this bearing and spacing formation one gap, this gap extends on these dustproof portion outer peripheral edges, and and this bearing between form annular opening again, in addition, this dustproof portion is in the annular opening place and be arranged with formation one scrobicular ring again, also is arranged with a ring in this scrobicular ring, and this ring exposes to this scrobicular ring one predetermined altitude, and makes this ring fit in this bearing face.

The beneficial effects of the utility model are:

Thus, bicycle of the present utility model is led the dustproof construction of sprocket gear, can reduce falling into of water and sandstone, rotates smooth and easy and the speed change that promotes Rear Derailleur purpose smoothly to have this bearing simultaneously concurrently.

Description of drawings

For above-mentioned and other purpose, feature and advantage of the present utility model can be become apparent, cited below particularlyly go out specific embodiment of the utility model, and conjunction with figs. is described in detail as follows, wherein:

Fig. 1 is the assembled sectional view that known bicycle is led sprocket gear.

Fig. 2 is the three-dimensional combination figure that the utility model bicycle is led sprocket gear.

Fig. 3 is the three-dimensional exploded view that the utility model bicycle is led sprocket gear.

Fig. 4 is the assembled sectional view that the utility model bicycle is led sprocket gear.

Fig. 5 is the assembled sectional view of another preferred embodiment of the utility model.

The specific embodiment

At first, see also Fig. 2 and shown in Figure 3, be respectively three-dimensional combination figure and three-dimensional exploded view that the utility model bicycle is led sprocket gear, the utility model includes:

One leads sprocket gear 10, is one-body molded, and the center also is provided with through hole.

One bearing 20 is located at the center that this leads sprocket gear 10, and these bearing 20 centers also are provided with an axis hole 21, and this bearing 20 is made up of ring 22 in one and outer shroud 23 involutory institutes, encircle in this 22 and 23 of outer shrouds also be provided with an articulated section 24.

One cover of dust 30, be to have a hollow shaft 31, and this hollow shaft 31 is to be sheathed on relatively in the axis hole 21 of this bearing 20, the formation that also extends radially outwardly in these hollow shaft 31 outer ends contains the dustproof portion 32 of covering whole bearing 20, should dustproof portion 32 be covered on relatively this bearing 20 distolateral on, be somebody's turn to do 20 on dustproof portion 32 and this bearing and spacing formation one gap 33, this gap 33 is to extend on these dustproof portion 32 outer peripheral edges, and and 20 on this bearing form annular opening again, in addition, should dustproof portion 32 also be arranged with formation one scrobicular ring 321 again in the annular opening place, also be arranged with a ring 322 in this scrobicular ring 321, and this ring 322 is to expose to this scrobicular ring 321 1 predetermined altitudes, and fits in this bearing 20 end faces, and the ring 322 of the utility model preferred embodiment is the elastomeric rubbery toroidal ring of a tool.

In the time will assembling, earlier this bearing 20 is pressed the center that this leads sprocket gear 10 of being located at, in packing is gone into respectively by axis hole 21 two ends of this bearing 20 with the hollow shaft 31 of these cover of dusts 30 again, and these hollow shaft 31 bottoms are can offset to end, and should dustproof portion 32 cover whole this bearing 20, also spacing therebetween formation has this gap 33, promptly finish assembling, when this leads sprocket gear 10 starts, this gap 33 can make this lead the function of slightly shaking about sprocket gear 10 has, and more can promote the smooth degree of Rear Derailleur speed change by this.

See also shown in Figure 4, be the utility model bicycle and lead the assembled sectional view of sprocket gear, figure can find out when combination thus, this ring 322 is the outer peripheral faces that fit in this bearing 20, and this ring 322 can push mutually with this bearing 20, make this ring 322 can more fit in this bearing 20 end faces, so that this lead sprocket gear 10 can be so as to intercepting water and sandstone, simultaneously, when this leads sprocket gear 10 starts, slightly shake about meeting, because of this ring 322 is elastic materials, so leading sprocket gear 10, this not influenced by this ring 322, and can smooth and easy speed change.

See also shown in Figure 5, be the assembled sectional view of another preferred embodiment of the utility model, it mainly is that compressing is assembled with a liner 40 on the inwall of this axis hole 21, this liner 40 is annular solids, and its external diameter is suitable with this axis hole 21 internal diameters, and phase packing, and this liner 40 further is provided with a group connecting part 41 in the middle place of its inwall radial loop, the group connecting part 41 of the utility model preferred embodiment is a ring flange, when assembling, this cover of dust 30 is to utilize this hollow shaft 31 to be inserted in relatively in this liner 40, and the bottom block of this hollow shaft 31 is on the end face of relative this group connecting part 41, and then is packed in this liner 40.

Claims

1, a kind of bicycle is led the dustproof construction of sprocket gear, wherein, this bicycle is led the sprocket gear center and is installed with a bearing, this bearing center also is provided with an axis hole, this bicycle is led sprocket gear and is covered with a cover of dust respectively in this bearing outside, this cover of dust has a hollow shaft, and is sheathed on relatively in the axis hole of this bearing by this hollow shaft, it is characterized in that:

This cover of dust, its hollow shaft outer end also extends radially outwardly along it and one to form the dustproof portion of covering whole bearing that contains, be somebody's turn to do between dustproof portion and this bearing and spacing formation one gap, this gap extends on these dustproof portion outer peripheral edges, and and this bearing between form annular opening again, in addition, should dustproof portion also be arranged with formation one scrobicular ring again in the annular opening place, be arranged with a ring in this scrobicular ring, and this ring exposes to this scrobicular ring one predetermined altitude, and this ring fits in this bearing face.

2, the dustproof construction of leading sprocket gear according to the described bicycle of claim 1 is characterized in that, wherein, this scrobicular ring is located at the outer circumferential side of this bearing relatively.

3, the dustproof construction of leading sprocket gear according to the described bicycle of claim 1 is characterized in that, wherein, this ring is the elastomeric rubbery toroidal ring of a tool.

4, the dustproof construction of leading sprocket gear according to the described bicycle of claim 1, it is characterized in that, wherein, the dustproof construction that this bicycle is led sprocket gear also is provided with a liner, this liner is an annular solid, and its external diameter is suitable with this shaft hole diameter, and the phase packing, and this liner also further is provided with a group connecting part in the middle place of its inwall radial loop, and the hollow shaft cover of this cover of dust is inserted in this liner.

5, the dustproof construction of leading sprocket gear according to the described bicycle of claim 4 is characterized in that, wherein, this group connecting part is a ring flange.