CN2133712Y - Chain for variable-speed bicycle - Google Patents

Abstract

The utility model relates to a chain used for variable-speed bicycles, which has the main structure that internal links are respectively arranged on both end parts of a liner; a coaxial chain roller is arranged between the two internal links and a coaxial chain axis is assembled again in a central through hole of the liner; both ends of the chain axis are respectively assembled with an external link; the circumference of the through hole by which the external link is pivoted with the chain axis is stamped inwards to form a concave margin; a flange extrudes out of the corresponding lateral face of the concave margin; an abutting surface which is paralleled with the plate body of the internal link is re-formed on the inner side of the flange; the diameter of the abutting surface is larger than the outer diameter of the assembling liner. The central waist part of the external link can lift outwards by the extrusion of the two flanges on the plate body, can enlarge the inner distance between the waist parts of the two external links.

Description

Chain for variable-speed bicycle

The utility model relates to a kind of chain that is assembled on the multi-speed bicycle, after being meant the combination of a kind of outer chain sheet and chain part especially, can be under the situation that does not increase the Yu crack buoyance lift outward, thereby enlarge inner distance between two outer chain sheets, with the sensitivity that improves speed change and the chain of smooth degree.

Common bicycle has the branch of so-called single-stage speed ratio bicycle and multistage speed ratio multi-speed bicycle according to the number of its drive sprocket quantity, wherein, is respectively equipped with the strand wheel on two pedals of single-stage bicycle and the rear-wheel spindle, naturally can't speed change in transmission; So-called multistage speed ratio multi-speed bicycle then is that its chain can be because of dialling the stirring on the sprocket wheel that transforms to the different numbers of teeth of chain device, to reach the effect of conversion transmission speed ratio, above-mentioned chain needs oblique fastening on forward and backward sprocket wheel in the process of conversion engagement sprocket wheel, therefore, in order to make chain more smooth and easy when the speed change, also must do change partly on its member; The utility model is improved at the chain outer chain sheet of aforementioned use on multi-speed bicycle, to increase the smooth degree of chain speed change.

At first, see also Fig. 1,2, this figure is a kind of front view and plan view of the outer chain sheet of chain in the past, and it mainly is to form respectively on plate body two end part 11 directly to perforation 12,11 then form the less waist of width 13 at two end part, and waist 13 upper and lower both sides form tilted guide surface 131 more respectively.

Please cooperate Fig. 3, this figure is a kind of combination schematic representation of chain in the past, and when outer chain sheet 1 was assembled on the chain 2 in the past, two perforation 12 wore, locatees for chain rivet 21 respectively, is positioned at tilted guide surface 131 inner side surface of relative orientation chain 2 respectively then on the waist 13; Therefore, when chain 2 when carrying out the speed change start, the formed tilted guide surface 131 in its upper and lower both sides can enlarge 1 of two outer chain sheet both side edges width up and down, be able to be easy to purpose to reach speed change with the sprocket on the convenient desire speed-changing chain by the quick space that embeds between two outer chain sheets 1 of the guiding of tilted guide surface 131.The aforementioned 1 flat design of outer chain sheet in the past, no doubt can increase the smooth degree of speed change because of the formation of tilted guide surface 131, if can be under the situation in the specification Yu crack of not changing inside and outside chain sheet, can enlarge the inner distance of 13 of two outer chain sheets again, just more can improve the sensitivity and the smooth degree of chain speed change.

Main purpose of the present utility model is after the combination of a kind of outer chain sheet and chain part is provided, and can improve the chain of chain speed change sensitivity and smooth degree under the situation that does not increase the Yu crack.

Major character of the present utility model is: chain mainly is chain to be rolled be located in the lining outer radius, wears chain rivet on the lining internal diameter, and the lining two end part combine with inner chain sheet respectively again, is assembled with outer chain sheet respectively at the outstanding two ends of chain rivet; The inside punching press of two perforation peripheries that is positioned at outer chain sheet forms flange, the flange inner face also is formed with the supporting surface of diameter greater than the lining external diameter, formation through above-mentioned supporting surface, can make chain keep under the situation of original combination relation position at member, suitably increase the inner distance between two outer chain sheet waists, and be beneficial to the speed change of chain.

That is to say, the utility model proposes a kind of multi-speed bicycle chain, this chain is that sheathed chain rolls outside lining, inner chain sheet is assembled at the lining two ends more respectively, on the lining center through hole, be provided with chain rivet, outer chain sheet is assembled at the chain rivet two ends respectively, outer chain sheet is provided with two perforation, it is characterized in that: two perforation peripheries are formed with the ring flange of a projection to the inside on the outer chain sheet to the chain inboard, be formed with the supporting surface of a plane of a loop in the flange bottom side, the diameter of supporting surface is greater than the external diameter of lining, and other parts of supporting surface and chain keep predetermined Yu crack.

Technological means is for achieving the above object now enumerated preferred embodiment and conjunction with figs., and after being described in detail in, wherein diagram is respectively:

Fig. 1 is a kind of front view of the outer chain sheet of chain in the past;

Fig. 2 is a kind of plan view of the outer chain sheet of chain in the past;

Fig. 3 is a kind of combination schematic representation of chain in the past;

Fig. 4 is the assembled sectional view of the utility model preferred embodiment;

Fig. 5 is the front view of the utility model preferred embodiment outer chain sheet;

Fig. 6 is the plan view of the utility model preferred embodiment outer chain sheet.

At first, see also Fig. 4, the chain that the utility model proposes equally by lining 31, chain roll 32, five kinds of members such as chain rivet 33, inner chain sheet 34 and outer chain sheet 4 are formed; Wherein, chain rolls 32 and is set on lining 31 external diameters, fixedly assembling inner chain sheet 34 respectively at lining 31 two end part, in lining 31 center through hole 311, wear chain rivet 33 again, outside the outstanding respectively inner chain sheet 34 in above-mentioned chain rivet 33 two ends, assemble outer chain sheet 4 more respectively at its two end part, the utility model is improved at the structure of outer chain sheet 4.

Then, see also Fig. 5,6, outer chain sheet 4 of the present utility model also be form respectively at plate body two end part 41 directly to perforation 42,41 form the less waists 43 of width in two ends, above-mentioned waist 43 upper and lower both sides also form the tilted guide surface 431 of inclination respectively; The downward punching press of two perforation, 42 peripheries that is positioned at plate body forms the recessed edge 421 of indent, be extruded with flange 44 in recessed edge 421 corresponding side surface, above-mentioned flange 44 inner side surfaces are formed with plane supporting surface 441 again, and the outer ring diameter of aforementioned supporting surface 441 is greater than lining 31 external diameters of assembling chain 3.

See also Fig. 4, when the outer chain that the utility model proposes after assembling, flange 44 1 ends of outer chain sheet 4 plate bodys projection to the inside are towards the inner side surface of chain, at this moment, formation through two flanges 44 on the plate body, can make therefore and outwards buoyance lift of plate body central authorities waist 43, to enlarge two inner distance between the outer chain sheet of setting up relatively 4 plate bodys; On the other hand, because flange 44 inboards of outer chain sheet 4 are formed with the supporting surface 441 of diameter greater than lining 31 external diameters, therefore, can parallel with inner chain sheet 34 plate bodys, specification Yu crack with 31 of the outer chain sheet 4 of keeping chain and inner chain sheet 34, linings, the secure bond body that makes inner chain sheet 34 and lining 31 is able to the supporting surface 441 that Yu crack appropriateness by this relies on outer chain sheet 4 in speed-change process; And the recessed edge 421 that is positioned at outer chain sheet 4 outer side surfaces can be chimeric for chain rivet 33 ends of assembling chain 3, increasing the inlay resultant force of 4 of chain rivet 33 and outer chain sheets, and dwindles the extent of the protrusion of chain rivet 33.

When the utility model when carrying out the speed change start, except the tilted guide surface 431 that originally is positioned on outer chain sheet 4 waists 43 can enlarge the inner distance 5 of the upper and lower both sides of two plate bodys, because 41 inboards, outer chain sheet 4 plate body two end part all are extruded with flange 44, therefore more can make the waist 43 outside buoyance lifts of two plate bodys, and enlarge the inner distance 5 of 4 of 3 liang of outer chain sheets of chain more; Therefore, when chain 3 is oblique fastening and will snaps on the speed-changing chain, the increase of its inner distance 5 can make 4 spaces of two outer chain sheets be easier to be fastened on the sprocket of speed-changing chain, to promote the sensitivity and the smooth degree of chain 3 speed changes, and when 4 spaces of the outer chain sheet that wherein is oppositely arranged on the chain 3 are inserted on the speed change sprocket, (comprising: the space just can be guided on the speed change sprocket chain 3 chain sheet backward one by one inside and outside chain sheet 34,4), and finish the start of speed change, so that the speed change of chain 3 is carried out fast.

What this was illustrated again be, the flange 44 that the chain that the utility model proposes is given prominence in outer chain sheet two perforation 41 1 sides, its objective is in the combination relation position of keeping between the member of original chain, just the supporting surface 441 of flange 44 bottom sides equals the inner side surface of planar outer chain sheet in the past, its width must be greater than the external diameter of chain 3 linings 31, can make inner chain sheet 34 rely on supporting surface 441 like this with the physical efficiency appropriateness that combines of lining 31, and in good time supporting to arrive in by supporting surface 441, returning position again, this is that aforementioned supporting surface 441 must have suitably enough width on the implementation, and the reason that must painstakingly be illustrated.

In sum, the chain that the utility model proposes is pressed to the flange of inboard projection to a side blow at the outer chain sheet two perforation peripheries of chain, form the supporting surface of external diameter again in flange inner greater than the lining external diameter, through keeping original distance between supporting surface and other members of chain, can make that just therefore inner distance increases between two waists of outer chain sheet; The increase of above-mentioned inner distance is for the employed chain of multi-speed bicycle, really can make chimeric sprocket be easier to snap between two outer chain sheets, so that make the assembling chain sensitive, smooth and easy more when speed change, also can promote carrying out fast of multi-speed bicycle gear shifting operation.

Claims (1)

1, a kind of multi-speed bicycle chain, this chain is that sheathed chain rolls outside lining, inner chain sheet is assembled at the lining two ends more respectively, on the lining center through hole, be provided with chain rivet, outer chain sheet is assembled at the chain rivet two ends respectively, outer chain sheet is provided with two perforation, it is characterized in that: two perforation peripheries are formed with the ring flange of a projection to the inside on the outer chain sheet to the chain inboard, be formed with the supporting surface of a plane of a loop in the flange bottom side, the diameter of supporting surface is greater than the external diameter of lining, and other parts of supporting surface and chain keep predetermined Yu crack.

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