CN2310009Y - Large chain wheel unit structure - Google Patents

Abstract

The utility model relates to a large chain wheel unit structure which at least comprises more than two fluted discs. The larger fluted disc is at least composed of more than two groups different teeth, and the top central line of the first group of teeth is biased to central line of the fluted disc, and is away from the smaller fluted disc. The second group of teeth is provided with at least three continuous character teeth, and the first character teeth is provided with a dent opposite to one side of the smaller fluted disc. The top centre line of the second character teeth is moved to the centre line of the fluted disc, which is near the smaller fluted disc, and a correct cogwheel is additionally arranged to the third character teeth. When the speed change is conducted, the chain does not interfere, and the shifting can be conducted without raising the chain. The timing shifting can be conducted under any condition, and the shifting efficiency can be promoted.

Description

Bicycle large fluted disc group structure

A kind of bicycle large fluted disc group structure belongs to the bicycle accessory class, refer to especially comprise one than small tooth plate and than large fluted disc, by the guiding of change-speed box chain is meshed and gear shift with different fluted disc.

Because the number of teeth between the large and small fluted disc of bicycle canine tooth wheels is widely different, for chain is performed to than large fluted disc by small tooth plate, prior art large fluted disc tooth-shape structure is taked two kinds of forms, it is to break outstanding mode with a kind of additional teeth structure or with tooth just like US.Pat.No.5192248, fasten the pin link plate of chain in the chain operation process, chain is raised with the cochain gear shift in making, and can increase manufacturing cost influences safety; Another kind of is to establish some salient points on than large fluted disc as US.Pat.No.5413534, during gear shift, prop up the pin link plate of chain with salient point and raise chain, just can reach the gear shift purpose after changeing a wide-angle, this structure salient point is easy to wear, influence gear shift usefulness, existing gear shift technology (Figure 1A, Figure 1B) wherein S1 is than small tooth plate in the large fluted disc group, S2 is than large fluted disc, C is a chain, F is the fluted disc rotation direction, and N is the fluted disc position that gear shift begins, and P is than salient point on the large fluted disc or additional teeth, no matter salient point or additional teeth P mode, being the next inner link of asking for an advance on one's pay support chain C outer link and raising chain link C (Fig. 1) and this outer link and being in unsettled non-matted state, be i.e. fluted disc S1, after S2 must change a big angle θ, the next outer link of chain C could mesh than the performing tooth T of large fluted disc S2 and finish the action of performing; And chain C alternately is made up of one outer, inner link, because in the actual gear shift action, two kinds of gear shift approach is arranged because of chain C and fluted disc S1, S2 ingear phase angle are different, outside both differences are, the inner link exchange; Two kinds of path contrasts, be that place, out of phase angle establishes one group of tooth that performs in addition on fluted disc entirely, when chain can't be when performing tooth gear shift success for first group because of the error of shift path, fluted disc can continue to rotate makes chain perform in the perform position of tooth of next group, therefore cause gear shift usefulness to reduce, in addition, because of less consideration chain by than gearshift procedure and the fluted disc tooth Shape Design of large fluted disc lower gear to the time than small tooth plate, cause than the large fluted disc lower gear and can't improve gear shift usefulness to than small tooth plate the time.

The purpose of this utility model is; A kind of improvement of bicycle large fluted disc group structure is provided, need raise chain and change tension force, and rotate minimum angles in the fastest time, finish the successful gear shift of fixed point at fluted disc; All can be improved gear shift usefulness by the location fixes gear shift of the tooth-shape structure of feature tooth guiding by this feature tooth; And need not rise chain can smooth-going gear shift, perform, how lower gear or chain and fluted disc phase angle of meshing all can be directed the gear shift of fixing a point by the second feature tooth place, with raising gear shift usefulness.

The purpose of this utility model can realize by following measure, be provided with on than large fluted disc and comprise first, two, three, four, five feature teeth, at least be provided with first, two, three feature teeth, the first feature tooth is provided with a cutting depression that prevents the chain interference towards the side than small tooth plate, the second feature tooth tooth top disalignment is to the close side than small tooth plate of fluted disc line of centers, the translation tooth that is a distortion is a vertical flank of tooth, the tooth top of the 3rd feature tooth reams 2mm to 4mm becomes shorter cognate, the 4th, five feature teeth are cognate entirely, the nearly normal tooth depth of the 5th feature toe joint, the 4th feature tooth is shorter than the 5th feature tooth, and the 3rd feature tooth is shorter than the 4th feature tooth; The purpose of this utility model can realize that also the i.e. second feature tooth flank of tooth translation is close than small tooth plate direction one suitable distance by following measure, and it is close than small tooth plate that its flank of tooth and tooth top line of centers all are offset to the fluted disc line of centers; Than on the large fluted disc except that the second feature tooth, the tooth top line of centers of the tooth that other are all relies on the fluted disc line of centers partially away from the side than small tooth plate; Be provided with the big conical surface of a bigger cutting on away from a flank of tooth at the second feature tooth, and this tooth is near the less flank of tooth that is provided with another less cutting than another flank of tooth of small tooth plate than small tooth plate; The first feature tooth is away from than cutting on the flank of tooth of small tooth plate the one less conical surface being arranged, and near cutting on than a flank of tooth of small tooth plate the one big conical surface is arranged in the first feature tooth, make the tooth top line of centers of the first feature tooth rely on the fluted disc line of centers partially away from a side than small tooth plate; Different positions, phase angle is provided with a plurality of first feature teeth on than large fluted disc, is equipped with the second feature tooth along perform next tooth of each first feature tooth of path of chain, and next tooth of each second feature tooth is equipped with the 3rd feature tooth; On than large fluted disc except that second and third, the four and five feature teeth, the tooth top line of centers of the tooth that other are all relies on the fluted disc line of centers partially away from the side than small tooth plate.

The utility model has the advantages that: need not raise chain and change tension force; and fluted disc changes minimum angles and the shortest time is guaranteed gear shift; chain is all adjustable point gear shift under any situation in two kinds of different shift path; during gear shift regardless of perform, lower gear or chain and fluted disc ingear phase angle; all adjustable point gear shift have improved gear shift usefulness.

The drawing explanation of accompanying drawing:

Figure 1A, 1B are prior art fluted disc anglec of rotation scheme drawing when gear shift

Fig. 2 is the structure improved front elevation of the utility model

Fig. 3 is the tooth-shape structure generalized section of first group of tooth of the present utility model

Fig. 4 A is the tooth-shape structure generalized section of the utility model second feature tooth 7

Fig. 4 B is another enforcement illustration of the utility model second feature tooth 8

Fig. 4 C is another enforcement illustration again of the utility model second feature tooth 9

Fig. 5 is the auxiliary projection of large fluted disc group structural improvement of the present utility model when gear shift

Fig. 6 is the top view of large fluted disc group structural improvement of the present utility model when gear shift

Fig. 7 is the elevational perspective view ㈠ of first kind of chain shift path when performing

Fig. 8 is the elevational perspective view (two) of first kind of chain shift path when performing

Fig. 9 is the elevational perspective view ㈠ of second kind of chain shift path when performing

Figure 10 is the elevational perspective view (two) of second kind of chain shift path when performing

Elevational perspective view when Figure 11 is first kind of chain shift path lower gear

Elevational perspective view when Figure 12 is second kind of chain shift path lower gear

Now contrasting accompanying drawing is described in detail as follows the utility model:

The large fluted disc group of bicycle (Fig. 2) at least comprises that a small tooth plate 18 and is than large fluted disc 1, at least be provided with tooth compositions different more than two groups on the large fluted disc 1, first group of tooth comprises than 2, the second groups of the most of full depth tooths on the large fluted disc 1 and comprises three continuous feature teeth 5,7,15 at least; Tooth (as Fig. 3) shape of the tooth 2 of first group of tooth, straight line A is the tooth top line of centers of tooth 2, straight line B is than the fluted disc line of centers of large fluted disc 1; Have on two lateral tooth flanks of a conical surface 3,4 at tooth 2 in each cutting on the tooth 2 of first group of tooth, near than the conical surface 4 cutting tips of small tooth plate 18 greater than away from the conical surface 3 than small tooth plate 18, make tooth top line of centers A be offset to the left of fluted disc line of centers B, (away from direction) than small tooth plate 18 in case during speed change chain by tooth 2 gear shift of first group of tooth.

Embodiment (Fig. 2) is made up of one first feature tooth 5, one second feature tooth 7 and one the 3rd feature tooth, 15 3 continuous teeth at least, the tooth-shape structure of the first feature tooth 5 (Fig. 3) is as first group of tooth 2, each cutting has a conical surface on two lateral tooth flanks of tooth, near than the conical surface cutting tip of small tooth plate 18 greater than away from the conical surface than small tooth plate 18, make the tooth top line of centers partially by to away to direction, in order to avoid chain is performed by the first feature tooth 5 during speed change than small tooth plate 18; And prevent that chain from performing and interfere the depression 6 of phenomenon in the process in being provided with one to a side on the first feature tooth 5 than small tooth plate 18, depression 6 is extended to the first feature tooth, 5 belows from the centre in the first feature tooth 5 and last tooth (with the chain path of performing), be rectangular shape depression 6, its degree of depth is no more than half of fluted disc 1 thickness, from the chain path of performing, the second feature tooth 7 is at the first feature tooth, 5 next tooth, for chain performs to the tooth that performs than large fluted disc 1 process; The second feature tooth, 7 tooth top line of centerss are by the close side than small tooth plate of fluted disc disalignment; The translation tooth of the second feature tooth 7 than large fluted disc 1 (Fig. 4 A) for being out of shape, not influence the engagement of chain and fluted disc is principle, the flank of tooth translation deflection of the second feature tooth 7 is than small tooth plate 18 suitable distances, make the flank of tooth of the second feature tooth 7 and tooth top line of centers A all be biased to fluted disc line of centers B, really be engaged in the second feature tooth 7 to than large fluted disc 1 time to guide chain to perform by a side than small tooth plate 18; Be designed to a vertical flank of tooth 10 in the second feature tooth 7 away from the flank of tooth in addition, and, make chain engages more firmly fasten the second feature tooth 7 and do not come off in the second feature tooth 7 near establishing a scalene cone 11 than the flank of tooth of small tooth plate 18 than small tooth plate 18; For the tooth top line of centers A with (Fig. 4 B) second feature tooth 8 is offset to fluted disc line of centers B near another means than small tooth plate 18 1 sides; Each cutting has a conical surface 13,14 on two lateral tooth flanks of the second feature tooth, 8 teeth, and near than the cutting tip of the conical surface 14 of small tooth plate 18 less than away from the conical surface 13 than small tooth plate 18, make its tooth top line of centers A be offset to fluted disc line of centers B near direction than small tooth plate 18; For the tooth top line of centers A with the second feature tooth 9 (Fig. 4) is offset to fluted disc line of centers B near the means again than small tooth plate 18 1 sides; Its second feature tooth 9 also can the additional teeth structure makes tooth top line of centers A be offset to right-hand (near than small tooth plate 18) of fluted disc line of centers B and chain easily is engaged to than large fluted disc 1 and difficult drop-off near a set conical surface 12 on the side than small tooth plate 18 on the second feature tooth 9.

The 3rd feature tooth 15 is at next tooth of the second feature tooth 7, (Fig. 2) its tooth top about 2～4mm that pruned, it is a short cognate, under the 3rd feature tooth 15, can add the 4th, the 5th feature tooth 16,17, this bidentate is cognate, the tooth top amount of pruning reduces gradually, (as the 4th feature tooth 16 1～2mm that prunes approximately, the 5th feature tooth 17 is pruned and is about 0.5～1mm), these cognates act on important in gearshift procedure: chain 19 is its auxiliary and top view (Fig. 5 when shifting into than large fluted disc 1 than small tooth plate 18, Fig. 6), chain 19 by outside, inner link 20,23 alternately form, in the gearshift procedure, chain 19 be subjected to change-speed box guiding by than small tooth plate 18 toward than large fluted disc 1 skew the time, the tooth 2 of first group of tooth because of tooth top line of centers deflection away from than small tooth plate 18 1 sides, so the bigger cutting conical surface 4 in the face of than small tooth plate 18 on the tooth 2 can prevent chain 19 and buckle than large fluted disc 1 from the tooth 2 of first group of tooth, when beat to than second group of tooth of chain 19 contact of large fluted disc 1 time, depression 6 provides the function of guide chain 19, in order to avoid interfere the chain front edge of board 21 of outer link 20, make outer link 20 and inner link 23 to close than large fluted disc 1, the second feature tooth 7 is close than small tooth plate 18, outer link 24 easily is engaged on the second feature tooth 7 than large fluted disc 1, and need not rise chain 19 can smooth-going gear shift; The front elevation of gearshift procedure (Fig. 7, Fig. 8), chain 19 rigidly connects and touches than large fluted disc 1 beginning gear shift moment, (Fig. 7) R shows the fluted disc rotation direction, suppose that straight line N is the datum line that fluted disc rotates, can find that large fluted disc only changes a little angle θ ' chain 19 outer links 24 and can buckle the second feature tooth 7 (Fig. 8) than large fluted disc, in fact θ ' is bordering on zero, and that expression chain 19 support is high, do not change tension state can finish gear shift before; Because of the second feature tooth 7 is the translation tooth, can not make chain 19 slippages because of fluted disc rotates, and rapid, accurate, high efficiency gear shift; (Fig. 5～Fig. 8) embodiment of article one shift path can only satisfy wherein a kind of situation, will lean on second kind of chain shift path to another kind of situation, and two kinds of situation differences are that outer, inner link 20,23 exchanges on practice; Prior art is to second kind of chain shift path, be on fluted disc not the inphase angle position add a kind of tooth that performs in addition, when chain because of first group of tracking error performs the tooth gear shift when not becoming, can continue to change that chain is performed in next group, cause the efficient that performs to reduce; And the utility model is met second kind of situation with translation tooth (the second feature tooth) and cognate (the 3rd feature tooth) collocation, and chain is finished the action of performing at the same group of tooth place that performs, and improves gear shift efficient.

Second kind of chain shift path embodiment (Fig. 9, Figure 10), just a tooth has been pushed ahead in chain link 20,23,24,25 more aforesaid positions, the depression 6 that the chain front edge of board 21 of outer link 20 can't lean against on the first feature tooth 5 engages into the second feature tooth 7 to guide next outer link 24, relatively the second feature tooth, 7 translation tooth tops are lived chain front edge of board 21, make chain 19 that the gear shift action take place at the second feature tooth, 7 places; (Figure 10) after the chain front edge of board 21 of outer link 20 is replaced by the second feature tooth 7 of translation, fluted disc 18,1 continues rotation, inner link 23 can turn down and be against the second feature tooth 7 partially towards the side than small tooth plate 1, and outer link 24 is taken advantage of a situation and engaged in the 3rd feature tooth 15; Because chain 19 is turned back down being supported to arrive in, and adds chain 19 because of change-speed box guiding beat causes differential seat angle distance slightly to than large fluted disc 1 time, can make chain 19 with than the engagement pitch of large fluted disc 1 cooperate the generation slight error, may cause interference; For avoiding outer link 24 to interfere with the 3rd feature tooth 15, special is a shorter cognate with the tooth top of the 3rd feature tooth 15 part of pruning, except that avoiding chain link 24,25 to interfere with the 3rd feature tooth 15 when the gear shift beat, also can make outer link 24 easier engaging in the 3rd feature tooth 15, finish gear shift; Simultaneously in the tooth top of fourth, fifth feature tooth 16,17 reduce gradually cutting form cognate make follow-up chain link easily engage into than large fluted disc 1 on corresponding teeth; So the utility model is first kind or second kind of chain shift path no matter, chain all can be guided the fixed point gear shift by the second feature tooth, 7 places; Chain 19 (Figure 11) be subjected to the guiding of change-speed box desire by than large fluted disc 1 beat lower gear to than small tooth plate 18 time, under first kind of chain path, the position of outer link 20 just is engaged in the second feature tooth 7, because the second feature tooth 7 is translation teeth, but outer link 20 beats rely on than small tooth plate 18, make back inner link 23 and the 3rd feature tooth 15 jump out of meshs than large fluted disc 1, and the cognate of the 3rd feature tooth 15 makes inner link 23 easily break away from the 3rd feature tooth 15, after making chain link smooth and easy by than large fluted disc 1 beat lower gear to than small tooth plate 18, finish gear shift; The chain 19 lower gear situations of (Figure 12) during second kind of shift path, chain link 20,23 tooth of respectively drawing back, inside and outside chain link is exchanged, at this moment, inner link 23 with the second feature tooth, 7 ingear teeth, because of the beat degree of inner link 23 on the translation tooth of the second feature tooth 7 limited, so outer link 24 can't break away from the 3rd feature tooth 15 immediately.Because uniqueness is provided with translation tooth and cognate, the tooth top of the 3rd feature tooth 15 cognates can support the carrier bar of outer link 24, make chain 19 beats to than small tooth plate 18, make follow-up inner link 25 break away from the 4th feature tooth smoothly, finish than large fluted disc 1 lower gear to gearshift procedure than small tooth plate 18, the 4th, five feature teeth 16,17 tooth top reduces the chain link 24 that the cognate that forms pruned makes chain 19 gradually, 25 easy disengagings did not produce interference than large fluted disc 1, so first, two, three feature teeth 5,7,15 tooth Shape Design, first or second path no matter, chain all can be directed by the gear shift of fixing a point on the second feature tooth 7 (on, lower gear), overcome the shortcoming of prior art.

In sum, the utility model is provided with teeth different more than two groups at least on than large fluted disc, in first group of tooth the tooth top disalignment of each tooth to the fluted disc line of centers away from direction than small tooth plate, chain is by first group of tooth gear shift in the time of can avoiding speed change; And second group of tooth is made of at least three continuous feature teeth, its above first feature tooth the side to less fluted disc be provided with a depression, the second feature tooth is the translation tooth, and make the tooth top disalignment close than small tooth plate to the fluted disc line of centers, the 3rd feature tooth is a shorter cognate, first or second kind of chain shift path all can be by the guiding of feature tooth by gear shift (going up or the lower gear) action of fixing a point of the position of feature tooth.

Claims (7)

1. bicycle large fluted disc group structure, be by large fluted disc, small tooth plate and chain are formed, it is characterized in that: be provided with on than large fluted disc and comprise the first feature tooth, the second feature tooth, the 3rd, four, five feature teeth, at least be provided with the first feature tooth, the second feature tooth and the 3rd feature tooth, this first feature tooth is provided with a cutting depression that prevents the chain interference towards the side than small tooth plate, the second feature tooth tooth top disalignment is to the close side than small tooth plate of fluted disc line of centers, the translation tooth that is a distortion is a vertical flank of tooth, the tooth top of the 3rd feature tooth reams 2mm to 4mm becomes shorter cognate, the 4th, five feature teeth are cognate entirely, the nearly normal tooth depth of the 5th feature toe joint, the 4th feature tooth is shorter than the 5th feature tooth, and the 3rd feature tooth is shorter than the 4th feature tooth.

2. bicycle large fluted disc group structure according to claim 1 is characterized in that: the second feature tooth flank of tooth translation relies on than small tooth plate direction one suitable distance, and it is close than small tooth plate that its flank of tooth and tooth top line of centers all are offset to the fluted disc line of centers.

3. bicycle large fluted disc group structure according to claim 1, it is characterized in that: be provided with the big conical surface of a bigger cutting on away from a flank of tooth at the second feature tooth, and this tooth is near the less flank of tooth that is provided with another less cutting than another flank of tooth of small tooth plate than small tooth plate.

4. bicycle large fluted disc group structure according to claim 1 is characterized in that: than on the large fluted disc except that the second feature tooth, the tooth top line of centers of the tooth that other are all relies on the fluted disc line of centers partially away from the side than small tooth plate.

5. bicycle large fluted disc group structure according to claim 1, it is characterized in that: the first feature tooth is away from than cutting on the flank of tooth of small tooth plate the one less conical surface being arranged, and near cutting on than a flank of tooth of small tooth plate the one big conical surface is arranged in the first feature tooth, make the tooth top line of centers of the first feature tooth rely on the fluted disc line of centers partially away from a side than small tooth plate.

6. bicycle large fluted disc group structure according to claim 1, it is characterized in that: different positions, phase angle is provided with a plurality of first feature teeth on than large fluted disc, be equipped with one second feature tooth along perform next tooth of each first feature tooth of path of chain, next tooth of each second feature tooth is equipped with the 3rd feature tooth.

7. bicycle large fluted disc group structure according to claim 1 is characterized in that: on than large fluted disc except that second, third, the 4th and the 5th feature tooth, the tooth top line of centers of the tooth that other are all relies on the fluted disc line of centers partially away from the side than small tooth plate.

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