CN2936912Y

CN2936912Y - Bicycle speed variator structure

Info

Publication number: CN2936912Y
Application number: CNU2006201198985U
Authority: CN
Inventors: 江承勋
Original assignee: TIANXIN INDUSTRY Co Ltd
Current assignee: TIANXIN INDUSTRY Co Ltd
Priority date: 2006-07-28
Filing date: 2006-07-28
Publication date: 2007-08-22
Anticipated expiration: 2016-07-28

Abstract

The utility model discloses a bike derailleur comprising a body, a crank arm, and a shift lever, wherein a bike tube fastener and a chain guide are arranged on the body and the chain guide is connected with the shift lever; the crank arm is L-shaped and is connected with the body. One end of the crank arm is provided with a connecting device for connecting the chain and a shaft is arranged on the other end and is connected with the shift lever. The L-shaped crank arm can be effectively pulled by the cable and transfers the force to the shift lever to move the chain. The L shape of the crank arm allows an efficient force transmission between the cable and shift lever and also less component wearing.

Description

The bicycle speed-varying unit structure

Technical field

The utility model relates to a kind of speed changer structure of bicycle.

Background technology

Bicycle has can go on a long journey the characteristic of taking into account environmental protection again, and in today of paying attention to recreation, is engaged in stress-relieving activity out of doors, experiences the happy of the Nature, optimum also can reach motion healthy promptly be by bike.Bicycle goes for a drive and not only can forge the chain physique, also can contribute to one's peace of mind of inner tranquility, and is best suited for modern's motion, and under the situation of two-day weekend, people have more increased many leisure times, and therefore under the situation that living standard promotes, the various improvement design of bicycle are more paid attention to by people.

Bicycle with speed changing function, the main fluted disc that changes that it is coaxial with pedal, and the driven fluted disc coaxial with trailing wheel, respectively be provided with several concentric waney gears, be connected between main commentaries on classics fluted disc and driven fluted disc by a chain is sheathed again, make the main any one group of gear mesh that changes fluted disc and driven fluted disc, so just can be by the position of switching chain, change main speed changing effect of changeing the gear mesh of different size between fluted disc and driven fluted disc and reach, can satisfy different driving road-conditions and demand.

The position of chain on fluted disc for a change, then need be provided with a transmission system, existing transmission system sees also US Patent No. 5607367, it mainly is provided with adjuster on Handlebar of bicycle, this adjuster sees through speed change cable wire and transmission system interlock, can be controlled the state of transmission system like this by adjuster.The user can see through the adjuster drawing or discharge this transmission system, when this transmission system is subjected to drawing, then establishes the push rod with spring in this transmission system and will push group chain sheet open, and this group chain sheet is then passed chain to the gear in the big footpath of fluted disc; Otherwise when speed-changing chain discharged, then the push rod of this transmission system was subjected to the effect of itself spring and withdraws, dial the chain sheet also with within contract, like this then chain can be returned on the gear of fluted disc than path.By above-mentioned operating mode, provide the user can freely switch chain sheathed gear, and reach the purpose of speed change.

Yet, this existing transmission system, its speed change cable wire drawing direction and push rod moving direction are the turnover of 90 degree, therefore will produce many unnecessary friction force, and make push rod and dial the chain sheet and can not actv. the pulling force of speed change cable wire be converted to the thrust of dialling the chain sheet, so user's comparatively inconvenience in the control of speed change, need expend bigger power, when tension force especially very fast in the speed of a motor vehicle, chain is big, more be difficult to reach the effect of control speed change, also easily cause the wearing and tearing and the consumption of assembly.

The utility model content

Technical problem to be solved in the utility model is to overcome in the prior art bicycle shift structure than consumption power and worn-down defective easily, and a kind of laborsaving and nonabradable bicycle speed-varying unit structure is provided.

For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of bicycle shift structure is provided, comprise a body, a coupled arm and one group of chain sheet, described body is provided with a bundle portion that is assembled on the bicycle shaft, but and the linkage part of a turn, this linkage part with dial the chain sheet and articulate; Described coupled arm is approximate " L " shape, and is hubbed on the body, and this coupled arm one end is provided with the connecting part for the combination of speed change cable wire, and is provided with pivot portion near the end of the other end, and this pivot portion articulates with group chain sheet.

More specifically, described coupled arm is in the bending place of " L " shape and leads arc.

More specifically, described coupled arm central authorities are provided with a pivot, and this pivot is hubbed on this body.

More specifically, the described group of chain sheet has one and wears spacing key way for chain.

More specifically, be formed with one in the middle part of the described body and support portion.

More specifically, be arranged with an elastic component on the described pivot, an end of this elastic component is resisted against on the coupled arm, and the other end is resisted against the portion that supports of body.

Compared with prior art, the beneficial effects of the utility model are: the speed changing structure that a kind of bicycle is provided, drive the effect that group chain sheet reaches speed change by coupled arm, described coupled arm bending place is L-shaped, but actv. is subjected to the drawing of speed change cable wire, and this power is passed to dials the chain sheet stirring chain, " L " shape design of this coupled arm then can provide efficient strength transmission effect between speed change cable wire and group chain sheet, more can reduce the wearing and tearing of inter-module.

Description of drawings

Fig. 1 is the three-dimensional exploded view of the utility model bicycle speed-varying unit structure;

Fig. 2 is the stereoscopic figure of the utility model bicycle speed-varying unit structure;

Fig. 3 is the assembling scheme drawing of the utility model bicycle speed-varying unit structure;

Fig. 4 is the running condition scheme drawing that the speed change cable wire of the utility model bicycle speed-varying unit structure is released into relaxed state;

Fig. 5 is the running condition scheme drawing of speed change cable wire when tight of the utility model bicycle speed-varying unit structure.

The specific embodiment

The utility model relates to a kind of bicycle speed-varying unit structure, please refer to Fig. 1 to shown in Figure 3, this bicycle speed-varying unit 1 mainly comprises a body 10, a coupled arm 20 and one group of chain sheet 30, for convenience of description, in the present embodiment, this change-speed box 1 is the structure explanation with a Front Derailleur.This change-speed box 1 is capable of being combined to be sheathed on the shaft 41 of bicycle 40, and is subjected to the control of adjuster, and reaches the effect of stirring the chain speed change.

Described body 10 1 ends are provided with a branch of 11, and this bundle portion 11 is a collar shape, can be sheathed on the shaft 41 of bicycle 40, and change-speed box 1 is combined with bicycle 40.These body 10 other ends are provided with a linkage part 12, this linkage part 12 is a shaft-like structure, the one end is the first pivot end 121, this first pivot end 121 is pivoted with body 10, linkage part 12 can be done with respect to body 10 rotates, these linkage part 12 other ends then are the second pivot end 122, and this second pivot end 122 can articulate for dialling chain sheet 30, make this group chain sheet 30 do rotation with respect to body 10 with linkage part 12.These body 10 middle parts are provided with one and support portion 13.

Described coupled arm 20 is approximate one " L " shape structure, this coupled arm 20 is to lead arcuation in the bending place of " L " shape, this coupled arm 20 is provided with a pivot 21 at the middle part, this pivot 21 can be arranged in the first pivot end 121, thereby, make its integral body be rotating bonding state in conjunction with body 10, linkage part 12 and coupled arm 20.On these coupled arm 20 pivots 21, wear an elastic component 211, this elastic component 211 can be a torque spring, its two ends are respectively first end 2111 and second end 2112, and this first end 2111 is resisted against on the coupled arm 20, and this second end 2112 then is resisted against the portion 13 that supports of body 10." L " shape one end of described coupled arm 20 is a connecting part 22, and this connecting part 22 can be established for 42 groups for the speed change cable wire, and the speed change cable wire please refer to Fig. 4 and shown in Figure 5.The other end book office of " L " shape of described coupled arm 20 then is provided with a pivot portion 23, and this pivot portion 23 cooperates pivot spare 43, clasp 44 and pad 45 and group chain sheet 30 pivot joint groups to establish.

Described group of chain sheet 30 has two groups of holes 31 that are pivoted and can combine with linkage part 12 second pivot ends 122 and 23 pivot joints of pivot portion respectively.This group chain sheet 30 has a circular-arc key way 32, and this key way 32 wears spacing for chain 46, when this group chain sheet 30 cross travels, can drive this chain 46 displacements in the lump.

After change-speed box described in the utility model 1 assembling is finished as shown in Figure 2, when being installed on the bicycle 40 then as shown in Figure 3.This change-speed box 1 combines with bicycle 40 with bundle portion 11, and the key way 32 of dialling chain sheet 30 then wears for chain 46, and this group chain sheet 30 also is subjected to the traction of coupled arm 20, and can stir chain 46, reaches the purpose of speed change.

The utility model in use, its as shown in Figure 4 and Figure 5, the coupled arm 20 of this change-speed box 1 combines with speed change cable wire 42 with connecting part 22, when the user controlled adjuster, then speed change cable wire 42 was with drawing or discharge coupled arm 20.

As shown in Figure 4, when being released into lax state as if speed change cable wire 42, then this coupled arm 20 is influenced by the elastic force of elastic component 211, will drive to dial chain sheet 30 displacement to the inside, and 46 past thereupon less gears 47 of diameter of the chains in this group chain sheet 30 key ways 32 move.

As shown in Figure 5, when comparatively tight as if speed change cable wire 42, then this coupled arm 20 is subjected to the drawing of speed change cable wire 42, dials chain sheet 30 displacement laterally and make, and the chains 46 in this group chain sheet 30 key ways 32 are moved toward the bigger gears 47 of diameter thereupon.Because of first end 2111 of elastic component 211 on coupled arm 20 pivots 21 and second end 2112 are resisted against coupled arm 20 respectively and support in the portion 13, therefore this elastic component 211 will be compressed the power of holding, be adjusted to lax state up to speed change cable wire 42, this elastic component 211 just can and be dialled chain sheet 30 pulling to the inside once more with coupled arm 20.

By above-mentioned mode of motion, the user can see through adjuster and 42 pairs groups of chain sheets 30 of speed change cable wire adjust, and this coupled arm 20 is L-shaped and have a bending of leading arc, therefore can be passed on group chain sheet 30 by more effective drawing gravitation speed-changing chain 46, avoid speed-changing chain 46 and the friction that turnover brought and the strength loss of dialling chain sheet 30, the effect that reaches laborsaving and reduce wear.

Claims

1, a kind of bicycle speed-varying unit structure comprises a body, a coupled arm and one group of chain sheet, it is characterized in that: described body is provided with a bundle portion that is assembled on the bicycle shaft, but and the linkage part of a turn, this linkage part with dial the chain sheet and articulate; Described coupled arm is approximate " L " shape, and is hubbed on the body, and this coupled arm one end is provided with the connecting part for the combination of speed change cable wire, and is provided with pivot portion near the end of the other end, and this pivot portion articulates with group chain sheet.

2, bicycle speed-varying unit structure according to claim 1 is characterized in that: described coupled arm is in the bending place of " L " shape leads arc.

3, bicycle speed-varying unit structure according to claim 1 is characterized in that: described coupled arm central authorities are provided with a pivot, and this pivot is hubbed on this body.

4, bicycle speed-varying unit structure according to claim 1 is characterized in that: described group of chain sheet has one and supplies chain to wear spacing key way.

5, bicycle speed-varying unit structure according to claim 1 is characterized in that: described body middle part is provided with one and supports portion.

6, bicycle speed-varying unit structure according to claim 5 is characterized in that: be arranged with an elastic component on the described pivot, an end of this elastic component is resisted against on the coupled arm, and the other end is resisted against the portion that supports of body.