CN2120220U

CN2120220U - Non-bushing chain structure for bicycle

Info

Publication number: CN2120220U
Application number: CN 92207373
Authority: CN
Inventors: 吴盈进
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-04-17
Filing date: 1992-04-17
Publication date: 1992-10-28

Abstract

The utility model relates to a non-bushing chain structure for bicycle, which mainly comprises a pin shaft, a roller, an internal chain plate and an outer chain plate. The pin shaft directly passes through the roller and the through holes of the inner and outer chain plates; the inner chain plate and the pin shaft are matched in a clearance type.

Description

Non-bushing chain structure for bicycle

The utility model relates to a kind of bicycle chain structure of liner-less, is meant a kind of the chain by the combination of four kinds of parts especially, have go slick, weight saving, and gear shifting operation is more rapid easily, advantage accurately.

A kind of structure of traditional type bicycle chain as shown in Figure 1, by bearing pin 11(Pin), roller 12(Roller), inner chain sheet 13(Roller Link Plate), outer chain sheet 14(Pin Link Plate) and lining 15(Bushing) etc. five kinds of spare parts combine.

Above-mentioned chain is when combination, be earlier each vertical fixing in the two ends circular perforations 130 of inner chain sheet 13a to be engaged a lining 15, then aforementioned roller 12 is sheathed on the periphery of said sleeve 15, follow an inner chain sheet 13b lock seaming in the upper end of said sleeve 15, run through articulating two outer chain sheet 14a, 14b at last again with aforementioned bearing pin 11, finish combination.

This conventional chains with lining is subjected to the influence of composite structure, and following shortcoming is arranged:

(1) be to be to closely cooperate because of lining 15 and two side inner chain sheets 13, combination back two side inner chain sheets 13 and lining 15 form a fixing combination, to each other can't other be independent movable, more dumb in running, especially when the action of speed change, the sprocket of chain fluted disc (Tooth of Sprocket) can produce a strength of outwards dialling to two inner chain sheets 13 in the moment of being inserted in two inner chain sheets 13.Therefore, after often using, two inner chain sheets 13 are easy to be deflection shape or disengaging with lining 15, and rely on outer chain sheet 14.Because inner chain sheet 13 itself is and lining 15 closely socket mutually, when producing skew so aforementioned inner chain sheet 13 is subjected to external force, and still belongs to tight socket between the lining 15, and can not turn round flexibly.Therefore, when inner chain sheet 13 after outer chain sheet 14 closings, because inner chain sheet 13 return again, just can produce the phenomenon of chain jamming (Tight Links), this not only can influence the flexible transmission of chain, and the life-span of the chain that can detract greatly, and can produce noise.

The clearance distance of (2) two side inner chain sheets 13 has the certain standard specification, and because secure bond lining 15 again, after whole combination, this clearance distance is difficult to accurately control, therefore must stay a tolerance (Tolerance) width, cause the overall width (length of bearing pin 11 just) of chain must reach the width of 8.0mm.Can't accurately control because of clearance distance, bearing pin 11 length must be reduced, so that be suitable for the more speed change of multistage.

(3) please consult Fig. 2 simultaneously, because the central hole at inner chain sheet 13 two ends must be inserted in lining 15 again, and the perforation of outer chain sheet 14 needn't be inserted in lining 15, so the piercing aperture of inner chain sheet 13 be than the piercing aperture of outer chain sheet 14 for big, and for taking the tensile strength of chain sheet into account, inner chain sheet 13 is under the situation that perforation increases, relative, the boundary dimension of inner chain sheet 13 also will be along with greater than outer chain sheet 14, and causes because of boundary dimension is not of uniform size, so can influence finishing smoothly of gear shifting operation.

(4) outer rim of inside and

outside chain sheet

13,14 normally forms a low-angle chamfering (Chamfer), and this gear shifting operation for chain does not have significant help.

The purpose of this utility model provides a kind of bicycle chain structure of liner-less, allows chain can accurately, promptly finish gear shifting operation, and can be more flexible, smooth and easy in running.

Major character of the present utility model is: chain only is made up of four kinds of parts such as bearing pin, roller, inner chain sheet and outer chain sheets.Being the Yu crack between inner chain sheet and bearing pin cooperates.The profile of inside and outside chain sheet is just the same, and the combination of the above-mentioned member of mat can allow chain have more smooth and easy, the rapid and accurate effect of gear shifting operation.

Be technology, the means that realize aforementioned purpose, now enumerate preferred embodiment and cooperate diagram that after being described in detail in, wherein diagram is respectively:

Fig. 1 is a kind of plan view of bicycle chain in the past.

Fig. 2 is the front view of bicycle chain in the past.

Fig. 3 is the utility model embodiment's a plan view.

Fig. 4 is the utility model embodiment's a front view.

Fig. 5 is the front view of the utility model embodiment inner chain sheet.

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

Fig. 7 is the A-A sectional view of (outward) chain sheet in the utility model embodiment.

Fig. 3 and shown in Figure 4 be the utility model embodiment's plan view and front view, wherein chain is made up of four kinds of parts such as bearing pin 2, roller 3, inner chain sheet 4 and outer chain sheets 5.2 of inner chain sheet 4 and bearing pins are the Yu crack and cooperate, so inner chain sheet 4 can be along the flexible displacement of the axis of bearing pin 2.Because the progress of modern heat treatment technology and materials science though aforementioned chain is not inserted a lining in roller 3 and inner chain sheet 4 central hole, can reach the wear-resisting requirement that undermines flexible activity too.

See also Fig. 5 and Fig. 6, the utility model is not owing to need to insert a lining in the perforation of the two ends of inner chain sheet 4, (51 need and bearing pin 2 closely cooperate because of boring a hole so perforation 41,51 apertures of aforementioned inner chain sheet 4 and outer chain sheet 5 are roughly the same, so its aperture is smaller), can be identical with the profile that causes aforementioned inside and outside chain sheet 4,5.

At last, see also Fig. 7, aforementioned inside and outside chain sheet 4,5 forms the big and more large-area chamfering 42,52 of the chain sheet of splaying of an angle in each angle processing with 20 degree of the upper and lower edge of waistline of 41,51 of two perforation.

By above explanation as can be known, liner-less chain structure of the present utility model has following advantage and effect at least:

(1) speed change easily, rapidly accurately: cooperate because combination back inner chain sheet 4 and bearing pin 2 are the Yu crack, inner chain sheet 4 can rely on outer chain sheet 5 along the axis of bearing pin 2, also can rely on roller 3 neatly again, so when the moment that the sprocket of chain fluted disc embeds during in speed change, can increase the gap (because of inner chain sheet 4 relies on outer chain sheet 5) of two inner chain sheets 4, the design that adds the special chamfering 42,52 of inside and outside chain sheet 4,5 more more increases the clearance distance of two side chain sheet outer rims.In addition, again because the profile of inside and outside chain sheet 4,5 is all in full accord, so when the multi-speed bicycle speed change, the sprocket of chain fluted disc can be easily and promptly embedded chain, can finish gear shifting operation smooth and easy, rapidly and accurately.

(2) chain operation is flexible, be difficult for producing the phenomenon of chain jamming: because aforementioned inner chain sheet 4 can be neatly at chain rivet 2 top offsets, so be difficult for making inside and outside chain sheet 4,5 gapless existence, can not produce the phenomenon of chain jamming, and chain is quite flexible in running, can significantly improve working life and reduce noise.

(3) the precision size degree is controlled easily: because the inner chain sheet 4 of roller 3 both sides is when reclining roller 3, it is the standard size width of 4 of two inner chain sheets, that is to say, the width of roller 3 is the standard size width of 4 of two inner chain sheets, so the precision size degree of chain can tightly accurately be controlled (error of the tolerance in rare gap).In fact, the length of bearing pin 2 (overall width of chain) can be controlled to accurately by traditional type 8.0mm only needs 7.8mm.As a result, the overall width of chain can dwindle, and the transverse tooth thickness of flywheel can be along with minimizing, so the number of flywheel can reach the effect than the multistage speed change along with increase.

(4) weight chain alleviates: because of bearing pin 2 shorten lengths, add dwindling of inner chain sheet 4 profiles, reach chamfering 42,52 and form some weight of splaying, after entire combination is finished, weight can general conventional chains reduce 14.6%, and it is more slim and graceful, light to allow bicycle scrunch.

Claims

A kind of bicycle chain structure of liner-less, it is characterized in that aforementioned chain only is made up of four kinds of parts such as bearing pin, roller, inner chain sheet and outer chain sheets, wherein, aforementioned bearing pin directly passes the perforation of roller and inside and outside chain sheet, and is the cooperation of Yu crack between aforementioned bearing pin and inner chain sheet.