CN201545160U

CN201545160U - Speed-changing bicycle and speed-changing mechanism thereof

Info

Publication number: CN201545160U
Application number: CN2009202663507U
Authority: CN
Inventors: 王继宝
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-11-10
Filing date: 2009-11-10
Publication date: 2010-08-11
Anticipated expiration: 2019-11-10

Abstract

The utility model discloses a speed-changing mechanism used for a speed-changing bicycle. The speed-changing mechanism comprises wheel discs arranged on a driving shaft and a flywheel arranged on a driven wheel; the wheel disc and the flywheel are connected by a chain in a transmission manner; the wheel disc comprises a small wheel disc and a large wheel disc; the flywheel comprises a large flywheel and a small flywheel; the small wheel disc and the large flywheel are connected by a first chain in a transmission manner to form a first shift; the large wheel disc and the small flywheel are connected by a second chain in a transmission manner to form a second shift; and the position of the driven shaft is provided with a shift switching component for controlling the small flywheel and the large flywheel to rotate or separate together. The speed-changing mechanism has simple structure, easy operation and stable performance. The utility model also discloses the speed-changing bicycle comprising the speed-changing mechanism.

Description

Variable speed bicycle and speed-changing mechanism thereof

Technical field

The utility model relates to manpower transportation's technical field, particularly relates to a kind of speed changing structure of variable speed bicycle.In addition, the utility model also relates to a kind of variable speed bicycle that comprises above-mentioned speed-changing mechanism.

Background technology

At present, general variable speed bicycle comes speed change by change-speed box, in the structure of bicycle, we cry imput shaft the axle that connects two pedals (pedal), cry driven shaft the axle that connects bicycle rear and vehicle frame, imput shaft is rotated and by chain driven shaft is rotated together, promptly driving trailing wheel by pedal advances, non-variable speed bicycle mainly adapts to various highway sections by manual change's speed drive shaft, variable speed bicycle changes transmitting ratio between imput shaft and the driven shaft by change-speed box, thereby reaches the labour-saving purpose.

Its principle is to dial before being provided with near imput shaft the chain, rotating the position of dialling before shifter bar will make changes, thereby chain is pushed on the different front gears, at this moment, it is just passable to rotate the shifter bar of regulating driven shaft again, that is to say that master and slave moving axis has all adopted disposable design, thereby form different transmitting ratios, reach the purpose of speed change.

3-5 big gear wheel is installed on the imput shaft of the main flow variable speed bicycle on the market, arrange from small to large, 6-9 gear is installed on driven shaft, arrange from big to small, two shifter bars are arranged on handlebar or vehicle body, respectively corresponding imput shaft and driven shaft, during speed change, rotate cooresponding shifter bar, chain is moved on the different gears, change be operating speed or tractive force.

Select maximum gear for use when imput shaft, when driven shaft is selected minimum gear for use, can obtain maximum speed, but require great effort most, use when being adapted at descending.Select minimum gear for use when imput shaft, when driven shaft is selected maximum gear for use, can obtain minimum velocity, but very laborsaving, when going up a slope, use particularly effective.In addition, current gear is fixedly the time, and the gear on the driven shaft is more little, can quicken more.

Though above-mentioned change-speed box can switch in bigger gear range, but owing to only carry out transmission between front gear and the backgear by a chain, in shift process, chain will move around on different front gears and backgear, front gear and back-geared wheelbase immobilize, different transmitting ratios needs different chain length to adapt to, therefore this change-speed box must solve the too tight or too loose problem of gearshift rear chain, otherwise too tight or too loose chain will cause bicycle normally not use.The technological means that addresses this problem is the fixedly position of chain of the track adjusting wheel dialled by the back, guarantee that by straining pulley chain has certain force of strain, chain is rolled on the gear tightly, straining pulley is fixed in the swing arm, by the spring tension, change with the degree of tightness that cooperates chain.

As can be seen from the above analysis, the speed changer structure of existing variable speed bicycle is very complicated, this directly causes its manufacturing cost to remain at higher level, and influenced the stability of change-speed box to a certain extent, simultaneously higher requirement has been proposed in maintenance, need often debugging, lost efficacy, take off faults such as chain otherwise gearshift takes place easily.

Therefore, how further simplifying the speed-changing mechanism of variable speed bicycle, make it have better handlingly and stable under prerequisite of daily operating needs satisfying, is those skilled in the art's technical issues that need to address.

The utility model content

The purpose of this utility model is to provide a kind of speed-changing mechanism, and this speed-changing mechanism is simple in structure, easy operating and stable performance.Another purpose of the present utility model provides a kind of variable speed bicycle that comprises above-mentioned speed-changing mechanism.

For solving the problems of the technologies described above, the utility model provides a kind of speed-changing mechanism, be used for variable speed bicycle, comprise wheel disc that is installed on the imput shaft and the flywheel that is installed on the driven shaft, described wheel disc is connected by chain gear with flywheel, described wheel disc comprises co-axially fixed small trochal disc and big trochal disc, described flywheel comprises big flywheel and small flywheel, described small trochal disc is connected by first chain gear with big flywheel, form first gear, described big trochal disc is connected by second chain gear with small flywheel, form second gear, described big flywheel is fixedly mounted on the rear wheel hub of variable speed bicycle, described small flywheel can be installed on the driven shaft with moving axially, being provided with in the side with described big flywheel can intermeshing end tooth, is arranged with retracing spring between the two on driven shaft, the gear changeover module that described driven shaft place is provided with control small flywheel and big flywheel engagement or separates.

Preferably, described gear changeover module comprises shift fork and the drag-line that is installed in rotation on the small flywheel outside, the upper end of described shift fork is provided with swing arm, be connected with the rear end of described drag-line, the lower end of described shift fork is flat prong like, and the front end of described drag-line threads to the part of controlling on handlebar or the vehicle body.

Preferably, described driven shaft is arranged in the prong of described shift fork.

Preferably, be set with sleeve on the described driven shaft, this sleeve is between described shift fork lower end and described small flywheel.

Preferably, described end tooth comprises forward double wedge and the reverse double wedge that is separately positioned on small flywheel and big flywheel side.

Preferably, described big trochal disc is positioned at the described small trochal disc outside, and described small flywheel is positioned at the described big flywheel outside.

Speed-changing mechanism provided by the utility model has the large and small wheel disc of two coaxial settings and the large and small flywheel of two coaxial settings, wherein small trochal disc is connected by first chain gear with big flywheel, form first gear, big trochal disc is connected by second chain gear with small flywheel, form second gear, between two gears, switch by gear changeover module may command speed-changing mechanism.

The maximum difference of this speed-changing mechanism and traditional change-speed box just is, it is first years old, second gear is respectively equipped with chain, during use, no longer be to stir chain shift, but stir the small flywheel gearshift, in whole shift process, chain on two gears does not move, and has only small flywheel to move along driven shaft, because the mode that small flywheel moves vertically is easy to control, very simple with respect to moving of chain, stable, reliably, therefore, its integral structure is also simple relatively, not only low cost of manufacture, and being not easy to take place gearshift lost efficacy, take off faults such as chain, fundamentally overcome the drawback that traditional change-speed box exists.

When normally driving, make small flywheel with big flywheel coaxial rotation by the gear changeover module, at this moment, the coaxial rotation that combines of two flywheels, but because small flywheel is to be driven by big trochal disc, rotating speed is higher than big flywheel, principle according to flywheel inside overdrive clutch structure, big flywheel will be in idling conditions, no longer acting has only big trochal disc to drive bicycle to overtake by small flywheel, and in fact speed-changing mechanism is in two retaining states, owing to be, therefore can obtain gait of march faster by the big trochal disc acting.

When climbing or driving down with the wind, make small flywheel break away from big flywheel by the gear changeover module, at this moment, though two flywheels rotate simultaneously, big trochal disc just drives small flywheel by second chain and dallies around axle, can not drive the trailing wheel of bicycle, have only small trochal disc to pass through first chain and drive big flywheel direct drive bicycle to overtake, speed-changing mechanism is in a retaining state, owing to be to do work by small trochal disc, therefore speed is slower, but very laborsaving.

The utility model also provides a kind of variable speed bicycle, comprises above-mentioned each described speed-changing mechanism.Because above-mentioned speed-changing mechanism has above-mentioned technique effect, the variable speed bicycle that above-mentioned speed-changing mechanism is installed also should possess the corresponding techniques effect.

Description of drawings

Fig. 1 is the schematic diagram of a kind of specific embodiment of speed-changing mechanism that the utility model provides;

Fig. 2 is installed in constructional drawing on the bicycle for speed-changing mechanism that the utility model provides;

The course of action scheme drawing that Fig. 3 is meshed with big flywheel for the small flywheel of speed-changing mechanism that the utility model provides;

Fig. 4 is the birds-eye view of course of action shown in Figure 3;

Fig. 5 stirs the course of action scheme drawing that small flywheel is meshed with big flywheel for the shift fork of speed-changing mechanism that the utility model provides.

Description of reference numerals is as follows:

10. part 51. sleeves 52. nuts are controlled in 411. swing arms 44. of imput shaft 20. driven shafts 11. small trochal discs 12. big trochal discs 21. big flywheel 22. small flywheels 31. first chains 32. second chains 221. small flywheel end teeth 211. big flywheel end tooth 23. retracing springs 41. shift forks 42. drag-lines 43. axle sleeves

The specific embodiment

Core of the present utility model provides a kind of speed-changing mechanism, and this speed-changing mechanism is simple in structure, easy operating and stable performance.Another core of the present utility model provides a kind of variable speed bicycle that comprises above-mentioned speed-changing mechanism.

In order to make those skilled in the art person understand the utility model scheme better, the utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Please refer to Fig. 1, Fig. 2, Fig. 1 is the schematic diagram of a kind of specific embodiment of speed-changing mechanism that the utility model provides; Fig. 2 is installed in constructional drawing on the bicycle for speed-changing mechanism that the utility model provides.

In a kind of specific embodiment, speed-changing mechanism provided by the utility model is arranged on the imput shaft 10 and driven shaft 20 of bicycle substantially.

Described speed-changing mechanism comprises wheel disc that is installed on the imput shaft 10 and the flywheel that is installed on the driven shaft 20, wheel disc is connected by chain gear with flywheel, wheel disc specifically has two, be respectively small trochal disc 11 and big trochal disc 12, small trochal disc 11 and big trochal disc 12 are installed on the imput shaft 10 in coaxial superimposed mode, big trochal disc 12 is positioned at small trochal disc 11 outsides (at Fig. 1, among Fig. 2, small trochal disc 11 dots), the quantity of flywheel is identical with number of wheels, also there are two, be respectively big flywheel 21 and small flywheel 22, big flywheel 21 is captiveed joint with the bicycle rear wheel hub, and small flywheel 22 is positioned at big flywheel 21 outsides, wherein small trochal disc 11 is in transmission connection by first chain 31 with big flywheel 21, form first gear, big trochal disc 12 is in transmission connection by second chain 32 with small flywheel 22, forms second gear.

Certainly, the inside and outside relative position that only refers to here, describe in order that be convenient to, it should be interpreted as absolute qualification, and the size of the size of wheel disc and flywheel, also only between the finger wheel dish and the relative size between the flywheel, concrete parameter can recently determine in transmission according to actual needs, as long as meet the installation requirement of bicycle and be controlled in the reasonable range.

The conversion of above-mentioned first gear and second gear relies on the engagement of small flywheel 22 and big flywheel 21 or separates and realize, small flywheel 22 can be installed on the driven shaft 20 with moving axially, its side relative with big flywheel 21 is provided with two end teeth 221 that are positioned on the same circumference, big flywheel 21 also is provided with two same end teeth 211 in its side relative with small flywheel 22, like this, when small flywheel 22 and big flywheel 21 abut against a time-out, just can be meshing with each other with end tooth 211 by end tooth 221 and be in the same place, on driven shaft 20, be arranged with retracing spring 23 between the two, under the elastic force effect of retracing spring 23, small flywheel 22 has the trend that breaks away from big flywheel 21 all the time.

Please refer to Fig. 3, the course of action scheme drawing that Fig. 3 is meshed with big flywheel for the small flywheel of speed-changing mechanism that the utility model provides.

The gear changeover module is used to control small flywheel 22 with 21 engagements of big flywheel or separate, need be installed near the driven shaft 20, specifically be positioned at the inboard of trailing wheel vehicle frame, mainly form by parts such as shift fork 41, drag-lines 42, the inboard of vehicle frame is welded with an axle sleeve 43, shift fork 41 is rotationally connected with axle sleeve 43, just be positioned at small flywheel 22 outsides, the upper end of shift fork 41 is provided with swing arm 411, be connected with the rear end of drag-line 42, the front end of drag-line 42 threads to controls part 44 on the vehicle body, and the lower end of shift fork 41 is flat prong like, and driven shaft 20 is arranged in the prong of shift fork 41.

Please refer to Fig. 4, Fig. 5, Fig. 4 is the birds-eye view of course of action shown in Figure 3, and Fig. 5 stirs the course of action scheme drawing that small flywheel is meshed with big flywheel for the shift fork of speed-changing mechanism that the utility model provides.

The lower end of shift fork 41 is flat prong like, under the normal condition, its flat horizontal surface and driven shaft 20 are perpendicular, only occupy the bulk of a thickness in the axial direction, at this moment, small flywheel 22 is separated with big flywheel 21 under the effect of retracing spring 23, speed-changing mechanism is in a retaining state, when controlling part action drag-line 42 tightened up, drag-line 42 can rotate to an angle shift fork 41 by swing arm 411 in axle sleeve 43, in rotary course, the bulk that the lower end that shift fork is flat occupies in the axial direction becomes greatly gradually, no longer perpendicular to driven shaft, but form angle with driven shaft, move along driven shaft 20 thereby promote small flywheel 22 by the part contact, up to being meshed with big flywheel 21, this moment, speed-changing mechanism was in two retaining states.

For guaranteeing that small flywheel 22 can steadily move along driven shaft 20, block and be unlikely to skew, on driven shaft 20, be set with a sleeve 51, this sleeve 51 is between shift fork 41 lower ends and small flywheel 22, like this, when shift fork 41 rotations, the propelling thrust of its lower end can be evenly distributed on the small flywheel 22 by sleeve 51, can avoid occurring the problem of unbalance stress, in addition, driven shaft 20 is provided with a nut 52 in shift fork 41 lower ends and sleeve 51 corresponding opposite sides, so that provide effective support for the shift fork lower end, help to alleviate the antagonistic force that the axle sleeve position is subjected to, guarantee that the energy of rotation of shift fork 41 carries out smoothly.

Under the effect of gear changeover module, overcome the application force of retracing spring 23 when small flywheel 22, along driven shaft 20 when big flywheel 21 moves, both end teeth are meshing with each other together, next plays running to small flywheel 22 in engagement with big flywheel 21, at this moment, though the wheel disc of two gears, flywheel and chain are all in operation, but because transmitting ratio difference, principle according to flywheel inside overdrive clutch structure, must be rotating speed faster small flywheel 22 drive bicycles to overtake, and big flywheel 21 is in idling conditions, can obtain gait of march faster, is suitable for using under normal operation.

When small flywheel 22 after resetting under the effect of gear changeover module, under the effect of retracing spring 23, small flywheel 22 moves along driven shaft 20, break away from big flywheel 21, next plays running to small flywheel 22 at the state that separates with big flywheel 21, at this moment, though the wheel disc of two gears, flywheel and chain are all in operation, but small flywheel 22 is in idling conditions, do not do work, have only small trochal disc 11 to drive big flywheel 21 and drive bicycles to overtake, drive laborsavingly, be suitable in climbing or use when facining the wind by first chain 31.

Above-mentioned end tooth 221 and end tooth 211 can be forward double wedge and the reverse double wedges that is separately positioned on small flywheel 22 and big flywheel 21 sides, to guarantee that small flywheel 22 and big flywheel 21 can both mesh together exactly under any relative position, the failure phenomenon of avoiding shifting gears takes place.

Small trochal disc 11 and big flywheel 21 are equivalent to the basic wheel disc and the flywheel of non-variable speed bicycle, speed-changing mechanism provided by the utility model is equivalent to further to have set up big trochal disc 12 on the basis of non-variable speed bicycle and small flywheel 22 forms second gear, and further set up the gear changeover module, between two gears, change, thereby make it have speed changing function, promptly be suitable for producing the brand new variable speed bicycle, also be suitable for non-variable speed bicycle is transformed.

Though speed-changing mechanism provided by the utility model only has two gears, but these two gears can satisfy the needs of daily life basically, when the cruising of smooth road surface, use second gear, when going up a slope or facing the wind, use first gear, need not again the gears of establishing more.In fact, the gear degree of utilization that transmitting ratio is too big or too little is all very low, almost performs practically no function, and causing idle waste on the contrary easily, and this is one of drawback of traditional change-speed box just also, and the utility model has then solved this problem well.

Because the mode that small flywheel moves vertically is easy to control, very simple, stable with respect to moving of chain, reliable, therefore, its integral structure is comparatively simple, low cost of manufacture and be not easy to take place gearshift and lost efficacy, take off faults such as chain, has fundamentally overcome the various drawbacks that traditional change-speed box exists.

Except above-mentioned speed-changing mechanism, the utility model also provides a kind of variable speed bicycle that comprises above-mentioned speed-changing mechanism, and the structure of these other each several parts of variable speed bicycle please refer to prior art, and this paper repeats no more.

Because above-mentioned speed-changing mechanism has above-mentioned technique effect, the variable speed bicycle that above-mentioned speed-changing mechanism is installed also should possess the corresponding techniques effect.

More than variable speed bicycle provided by the utility model and speed-changing mechanism thereof are described in detail.Used specific case herein principle of the present utility model and embodiment are set forth, the explanation of above embodiment just is used for helping to understand core concept of the present utility model.Should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model principle, can also carry out some improvement and modification to the utility model, these improvement and modification also fall in the protection domain of the utility model claim.

Claims

1. speed-changing mechanism, be used for variable speed bicycle, comprise wheel disc that is installed on the imput shaft and the flywheel that is installed on the driven shaft, described wheel disc is connected by chain gear with flywheel, it is characterized in that, described wheel disc comprises co-axially fixed small trochal disc and big trochal disc, described flywheel comprises big flywheel and small flywheel, described small trochal disc is connected by first chain gear with big flywheel, form first gear, described big trochal disc is connected by second chain gear with small flywheel, forms second gear, and described big flywheel is fixedly mounted on the rear wheel hub of variable speed bicycle, described small flywheel can be installed on the driven shaft with moving axially, being provided with in the side with described big flywheel can intermeshing end tooth, is arranged with retracing spring between the two on driven shaft, the gear changeover module that described driven shaft place is provided with control small flywheel and big flywheel engagement or separates.

2. speed-changing mechanism according to claim 1, it is characterized in that, described gear changeover module comprises shift fork and the drag-line that is installed in rotation on the small flywheel outside, the upper end of described shift fork is provided with swing arm, be connected with the rear end of described drag-line, the lower end of described shift fork is flat prong like, and the front end of described drag-line threads to the part of controlling on handlebar or the vehicle body.

3. speed-changing mechanism according to claim 2 is characterized in that described driven shaft is arranged in the prong of described shift fork.

4. speed-changing mechanism according to claim 2 is characterized in that, is set with sleeve on the described driven shaft, and this sleeve is between described shift fork lower end and described small flywheel.

5. speed-changing mechanism according to claim 1 is characterized in that, described end tooth comprises forward double wedge and the reverse double wedge that is separately positioned on small flywheel and big flywheel side.

6. speed-changing mechanism according to claim 1 is characterized in that, described big trochal disc is positioned at the described small trochal disc outside, and described small flywheel is positioned at the described big flywheel outside.

7. a variable speed bicycle is characterized in that, comprises aforesaid right requirement 1 to 6 arbitrary described speed-changing mechanism.