CN2126348U - Easily speed-changing chain - Google Patents

Abstract

The utility model relates to an easily speed-changing chain, which comprises an external link, an internal link, etc. A guiding incline is formed by bending an arc from outside to inside between two through holes of the external link, and a concave section is formed respectively on the front and the back of both the bottom side and the roof side of the through holes of the external link; the guiding incline is also formed on the circumference of the internal link which is also provided with two through holes and a spine pole extends from the lateral side of the internal link. Two reactive concave sections are formed on the plate body at the back of the spine pole arranged on the through holes of the internal link. When the chain changes speed, the concave section of the external link arranged at the outside of the chain is erected on a pinion of a chain wheel, so the chain has a center lean bunt section in the course of changing speed so as to achieve the advantages of smooth speed change and small noise.

Description

Easily speed-changing chain

It is smooth and easy fast and can reduce the chain that is easy to speed change of chain speed change noise that the utility model relates to the chain of a kind of use at speed changing bicycle, particularly a kind of speed change.

Common speed changing bicycle mainly is a plurality of diameters of installing, a sprocket wheel that the number of teeth is different on the transmission shaft of treadle, when chain during respectively with the sprocket wheel tabling of the different numbers of teeth, just can make the different transmission speed ratio of bicycle generation, to reach the effect of speed change; Generally speaking, when the chain of speed changing bicycle will be embedded in different sprocket wheels, be to insert on another sprocket wheel in the mode of oblique extension, therefore, the employed planar chain of chain can't be fast and embed swimmingly on the different sprocket wheels when speed change in the past, thereby, cause the speed change difficulty; In order to improve above-mentioned shortcoming, chain is in recent years improved at the employed chain sheet of speed changing bicycle, in the hope of reaching speed change effect smoothly; And in order to reach above-mentioned advantage, its improved procedure normally strengthens two distances between the chain sheet, so that the sprocket of sprocket wheel is when embedding between two chain sheets of chain, have between bigger chimeric empty, to reduce the friction between sprocket and chain sheet, and the means of the expansion two chain distance between commutator segments that adopted roughly are divided into two kinds, the first is at the inboard tilted guide surface that forms tilted conical of chain sheet, to make things convenient for the embedding of sprocket, another kind of mode is on the inboard inclined-plane that forms the circular arc indent of chain sheet, can reach speed change effect smoothly equally, but no matter use above-mentioned which kind of means, its gearshift performance still can not be perfect, mainly is because the chain of above-mentioned improvement has also been ignored chain and the sprocket chimeric instantaneous variation that produces mutually.

At first, see also Fig. 1, this figure is a kind of organigram that in the past was easy to the chain of speed change, this chain mainly by: outer chain sheet 11, inner chain sheet 12, chain rivet 13 and chain roll four kinds of parts such as 14 and are formed; Above-mentioned member is when combination, be that the protruded stigma 121 that give prominence to two inner chain sheet 12 inboards is set up relatively, roll 14 at two sheathed chains in protruded stigma 121 outsides, in the perforation 122 of two inner chain sheets 12, connect a chain rivet 13 again, fixing outer chain sheet 11 respectively again at chain rivet 13 two ends; 11 inboard central authorities have intilted tilted guide surface 111 at outer chain sheet, to increase by two distances between the outer chain sheet 11; And between inner chain sheet 12, similarly also be formed with tilted guide surface 123, to enlarge the distance (additional disclosure between the inner chain sheet 12, chain can set firmly lining again between two inner chain sheets in the past, and above-mentioned chain has been given prominence to protruded stigma to replace the lining of chain in the past on two inner chain sheets, therefore, the lining part just no longer appears) in above-mentioned chain.

Please cooperate shown in Fig. 2,3, it is the speed change schematic representation that in the past was easy to the chain of speed change that this figure waits, and the assembled sectional view of the 3-3 line of Fig. 1; When above-mentioned chain 1 under normal operation, the space between two interior sheets 12 of chain or two outer chain sheets 11 can embed the sprocket 91 that be arranged in parallel, turns round making it smooth-goingly; And in the time will carrying out the speed change operation, at first make chain 1 oblique be crossed on two sprocket wheels 9 and 9 ' between, at this moment, outer side with the outer chain sheet 11 at the position of the chain 1 of sprocket wheel 9 ' at first contact, because above-mentioned outer chain sheet 11 outer side are smooth smooth plate body, therefore, above-mentioned outer chain sheet 11 lacks under the state of positioning structure in outer side, very easily because landing is on script sprocket wheel 9 by establishing shakiness, like this, next section chain 1 just can't successfully embed sprocket wheel 9 ' sprocket 91 ', just, so-called speed change operation is had to begin the beguine, embed smoothly up to the gap on the outer chain sheet 11 another sprocket wheel 9 ' sprocket 91 ' till going up, above-mentioned landing again is in the action of script sprocket wheel 9, will make when speed change, to seem chain 1 utmost point has some setbacks, produce noise in the time of also can causing speed change, therefore, if can't be rapid in the speed-change process of chain 1, certain speed change success can influence its speed change smoothness and produce noise.

By above explanation as can be known, though chain had strengthened the gap between two inside and outside chain sheets in the past, though but the gap of strengthening helps inside and outside chain sheet to be placed in sprocket, but in speed change in an instant, chain and chain between cog lack positioning structure, also make easily originally to be crossed on to want on the speed change sprocket chain landing once again on the sprocket of script, cause having some setbacks of speed change, certainly, the noise that produces of up time is not bigger yet for speed change, and seems desirable not to the utmost.

Main purpose of the present utility model is that the chain that is easy to speed change that a kind of speed change is quick, smooth and easy, reduce the speed change noise is being provided.

Major character of the present utility model is: the rear and front end, bi-side is formed with depressed part respectively on the outer chain sheet of chain, and makes outer chain sheet plate body perforation dual-side thickness dwindle; When chain when carrying out gear shifting operation, the outstanding position between the two symmetrical depressed parts can be by being located on the sprocket of wanting speed-changing chain, and make chain in speed-change process, has the position of abutting against, and is beneficial to the speed change of chain.That is to say that the perforation both sides on two sides, the end, outer chain sheet plate body top are formed with depressed part respectively, and the outer chain sheet perforation outside just is formed with protuberance.

Accidental quality of the present utility model is: the mutually close side of the inner chain sheet of chain and outer chain sheet has corresponding depressed part, enlarging the space between inside and outside chain sheet, and is beneficial to the speed change of chain.

For reaching above-mentioned purpose, technological means that is adopted and effect thereof are lifted a preferable possible embodiments now, and conjunction with figs. details are as follows:

Fig. 1 is a kind of organigram of chain in the past;

Fig. 2 is a kind of speed change schematic representation of chain in the past;

Fig. 3 is the 3-3 line assembled sectional view of Fig. 1;

Fig. 4 is the utility model embodiment's a assembled sectional view;

Fig. 5 is the utility model embodiment's an outer chain sheet stereogram;

Fig. 6 is the utility model embodiment's an inner chain sheet stereogram;

Fig. 7 is the sectional view of the 7-7 line of Fig. 4;

Fig. 8 is the utility model embodiment's a speed change schematic representation;

Fig. 9 is a kind of sprocket part enlarged view of sprocket wheel.

At first, see also Fig. 4, the chain that the utility model proposes also rolls four kinds of parts such as 5 by outer chain sheet 2, inner chain sheet 3, chain rivet 4 and chain and is formed, perforation 31 peripheries of inner chain sheet 3 also punching press are extruded with protruded stigma 32, replacing the lining of chain in the past, and are that the protruded stigma 32 of two inner chain sheets 3 is set up relatively equally during its combination, on protruded stigma 32 external diameters, wear chain again and roll 5, the perforation 31 that is positioned at inner chain sheet 3 is equipped with chain rivet 4, sets firmly outer chain sheet 2 respectively again at chain rivet 4 two ends, one-tenth chain 8 just capable of being combined; In addition, two perforation, the 21 middle inwardly curved arcs that are positioned at outer chain sheet 2 are formed with the tilted guide surface 22 of two symmetries, to enlarge the distance of 2 of two outer chain sheets, and the plate body periphery of inner chain sheet 3 also is formed with tilted guide surface 33, to enlarge two distances between the inner chain sheet 3, above-mentioned structure is all with identical in the past, and improvement of the present utility model focuses on: the thickness of perforation 21 dual-sides of outer chain sheet 2, and the variation of the thickness of perforation 31 dual-sides of inner chain sheet 3.

Please cooperate shown in Fig. 4,5, the outer chain sheet 2 of the chain that the utility model proposes is the plate body of thickness 1mm, and the plate body both sides have two directly to perforation 21, central position thickness attenuation gradually between two perforation 21, and form tilted guide surface 22; Be positioned at that the front and back dual-side on perforation 21 tops is recessed respectively a flat depressed part 23, the about 0.2mm of height difference of depressed part 23 and perforation 21 peripheries, and outer chain sheet 2 bottom side relative positions also be formed with depressed part 23 ', just, if the left and right sides view by outer chain sheet 2 is watched as can be known, near perforation 21 thickness partly is 1mm, and the comparatively outstanding protuberance 24 of formation, and have two depressed parts 23,23 ' the plate body reduced down in thickness to 0.6mm, why above-mentioned thickness near perforation 21 peripheries does not reduce, and the degree that dual-side thickness reduces can not be too big, mainly is the tensile strength that will keep outer chain sheet 2.

Then, please cooperate shown in Fig. 4,6, the inner chain sheet 3 of the chain that the utility model proposes also has two perforation 31,31 peripheries of boring a hole side-prominently have a protruded stigma 32 to one, replacing the lining of chain in the past, and be formed with tilted guide surface 33 at the plate body periphery of inner chain sheet 3, the sprocket that is beneficial to sprocket wheel embeds; And improvement of the present utility model focuses on: inner chain sheet 3 is formed with depressed part 34 respectively away from the both sides, front and back of the perforation 31 of a side of protruded stigma 32, and above-mentioned depressed part 34 is 0.3mm with the height difference of perforation plate body end face.

Please cooperate Fig. 4,7, when each component composition became chain 8, the depressed part 23 of outer chain sheet 2 was positioned at the outer side of whole piece chain 8, and another depressed part 23 ' be combined into bigger space 61 with the depressed part 34 of inner chain sheet 3.

Please cooperate Fig. 7,8,9 chains that ought the utility model proposes in use, gap between two outer chain sheets 2 and two inner chain sheets 3 similarly is crossed on the sprocket 711 of sprocket wheel 71, and in the time will carrying out variable speed operation, similarly, chain 8 can obliquely be crossed on two sprocket wheels 71 and 71 ' between, if chain will by sprocket wheel 71 be transformed into sprocket wheel 71 ', then chain 8 can be by oblique pulling, at this moment, two depressed parts 23 of the outer chain sheet 2 of chain 8 and 23 ' between protuberance 24 just can be erected at sprocket wheel 71 ' sprocket 711 ' on, the chain order that is positioned at outer chain sheet 2 the place aheads just can because of chain 8 be erected at sprocket 711 ' on, and be moved to easily sprocket wheel 711 ' on, so just can reach the effect of speed change easily, certainly, 3 spaces of being formed 61 of above-mentioned outer chain sheet 2 and inner chain sheet, mainly be when making the difference obvolvent of sprocket 711 ' both sides at protuberance 24, have than large space, insert for sprocket 711 ' one ends, so that outer chain sheet 2 is more smooth and easy when abutting against, therefore, form depressed part 23 respectively at outer chain sheet 2 perforation 21 dual-sides, when chain 8 when speed change is oblique, chain 8 just can be erected on the sprocket easily, and make whole piece chain 8 embed easily on another sprocket wheel, so in above-mentioned, outer chain sheet 3, the depressed part 23 that forms on 2,34 can make chain more smooth and easy when speed change really.

Additional disclosure, its end face of sprocket of general sprocket wheel mostly becomes plane, and in order to increase the effect of chain speed change, also have the latter half of central authorities of chain tooth tip are formed chase, its shape roughly as shown in Figure 9, when described chain was used on the above-mentioned sprocket 51, the protuberance 24 of outer chain sheet 2 can be erected on the chase 511 of sprocket 51, chain is had when speed change well abut against the position, be more conducive to speed change in case on-slip is taken off.

By above explanation as can be known, under the situation that does not influence chain tensile strength, in an amount of the minimizing, outer chain sheet perforation dual-side thickness, really can make chain when speed change, the chain between cog of its chain sheet and sprocket wheel has the position that abuts against, therefore, stop in the middle of chain has when speed change, the space of location, so just, can avoid because the slippage time and again when abutting against mutually of the smooth surface of chain sheet and sprocket, and influence the smooth degree of speed change, certainly, its one-time positioning is finished the effect of speed change, and the noise that slippage is produced in the time of also reducing the chain speed change is to reduce noisiness, so the chain sheet perforation periphery at chain forms depressed part, it is quick to have speed change really, smooth and easy, reduce the advantage of speed change noise sound.

In sum, on the chain sheet of chain, form suitable depressed part, abut against the position when chain speed change can be provided really, make chain more smooth and easy when speed change, reduce noise, so above-mentioned chain had the enhancement on the effect really more in the past.

Claims (4)

1, a kind of chain that is easy to speed change comprises that outer chain sheet, inner chain sheet, chain rivet and chain roll, and has two perforation on the outer chain sheet, and chain rivet is located in the perforation, is formed with the tilted guide surface of curved arc shape on the side between two perforation of outer chain sheet;

It is characterized in that: the perforation both sides on two sides, the end, outer chain sheet plate body top are formed with depressed part respectively, and the outer chain sheet perforation outside is formed with protuberance, and when the chain speed change, protuberance is can be erected on the sprocket of sprocket wheel.

2, according to the described chain that is easy to speed change of claim 1; It is characterized in that: on the mutually close side of inner chain sheet and outer chain sheet, be formed with the depressed part that cooperates with outer chain sheet.

3, according to the described speed-changing chain that is easy to of claim 1; It is characterized in that: outer chain sheet is 1mm near the plate body thickness of two perforation peripheries, and the thickness of dual-side is 0.6mm before and after the outer chain sheet perforation and be positioned at.

4, according to claim 1 or the 2 described chains that are easy to speed change; It is characterized in that: inner chain sheet is 1mm near the plate body thickness of two perforation peripheries, and the thickness of dual-side is 0.7mm before and after the inner chain sheet perforation and be positioned at.

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