CN2275550Y - Speed changing box for bicycle - Google Patents

Abstract

The utility model discloses a speed changing box for a bicycle, which is used and arranged on a bicycle. In the utility model, a slide triple gear is arranged on a foot crank shaft, a shift fork is clamped on the triple gear, and is arranged on a box body through a rotary shaft and a bearing; a fixing triple gear engaged with the slide triple gear is arranged on the box body through the rotary shaft and the bearing near the slide triple gear, and the slide triple gear is engaged with a fixing gear which is arranged on the rotary shaft near the slide triple gear; a large disk is arranged at a shaft end outside the box body of the fixing gear, a drawing wire of a variable stop buffer is arranged on the shift fork, and the engagement of the variable stop buffer between speed change wheels can be realized. The utility model has the advantages of simple structure, firmness, durable performance, flexible operation and strong reliability, and the popularization and the application of the utility model can bring convenience to people.

Description

Speed changing box for bicycle

The utility model relates to a kind of speed changing box for bicycle of adorning usefulness on bicycle.

Bicycle be a kind of walking-replacing tool commonly used, particularly mountain bike more bicycle opened up bright application prospect.And at present mountain bike on integral structure basically still with conventional bicycle, its maximum characteristics are except that solid, are exactly speed changing structure.Existing its speed changing structure of mountain bike is to be made of the front and back change wheel, be that three big trochal discs are arranged on the axis, rear flywheel is six layers of gear, and this structure speed change class is many, and structure is numerous and diverse and impracticable, parts damage easily, two wire drawings cooperate realization before and after will having in speed-change process, if cooperation is bad, are easy to damage change wheel, influence service life greatly, though, really do not use, and in case break down so many mountain bikes have transmission system, the maintenance trouble, time-consuming, waste money, therefore, the speed change mountain bike is not really brought into play its speed changing function, for people ride with making troubles.

The purpose of this utility model provides a kind of improved speed changing box for bicycle, and it can solve the sprocket wheel speed change problem of bicycle effectively.

The purpose of this utility model is achieved like this, turn at pin and to adorn a slip triple gear on the axle, adorn a shift fork between big-and-middle the wheel, shift fork is contained on the declutch shift shaft, adorn stage clip on the declutch shift shaft, the pulley triple gear is other another fixing triple gear identical with its size and that can be meshed, and its bull wheel is meshed with tight pulley by it, and tight pulley is contained in the rotating shaft, on rotating shaft one end deep bid is arranged, above-mentioned each be contained in respectively on the casing, the variable block wire drawing is housed, to realize the variable block engagement between change wheel on the shift fork.

It is simple in structure, sturdy and durable for the utility model, operate nimble, good reliability, effective, it is applied must be for people's life bring convenience, and opens up more wide application prospect and good economic and social benefit for variable speed bicycle.

Below in conjunction with accompanying drawing structure of the present utility model is elaborated.

Accompanying drawing is a constructional drawing of the present utility model.

Shown in figure, the utility model is to turn at pin slip triple gear 9 is housed in the rotating shaft 8, card has shift fork 11 on it, shift fork 11 is contained on the declutch shift shaft 10, stage clip 12 is housed on the declutch shift shaft, declutch shift shaft 10 is fixed on the casing 1, there is fixedly triple gear 7 identical with its size and that can be meshed on slip triple gear 9 sides, triple gear 7 is installed in the rotating shaft 6, the fixed gear wheel 3 that is contained in the rotating shaft 2 is meshed rotating shaft 2 with the fixing bull wheel of triple gear 7,6,8 are contained on the casing 1 with bearing 4 successively, and deep bid 5 is equipped with in rotating shaft 2 on the end outside casing, through pulley the variable block wire drawing 13 of stretching out outside the casing is housed on the shift fork 11, to realize the variable block engagement between change wheel.

Said slip triple gear 9, fixedly triple gear 7 is respectively by greatly, in, little three identical gears constitute, slip triple gear 9 is to be contained in slidably in the rotating shaft 8, fixedly triple gear 7 is are installed on rotating shaft 6 in opposite with slip triple gear 9 large, medium and small three-wheels, and big between large, medium and small three-wheel on square and the slip triple gear 9, in, square difference between little three gears, greatly, in, little three gears are a fixing integral body, bearing 4 is 202 bearings, its big wheel diameter is 60mm, 28 teeth, middle wheel diameter is 50mm, and 23 teeth, little wheel diameter are 40mm, 18 teeth, deep bid 5 are former bicycle big chain plate.

In use, pin of the present utility model is turned the pin that rotating shaft 8 is contained in former bicycle turn the axle place, deep bid 5 links to each other with the flywheel on the rear axle through chain, advances so that its power drives bicycle through transmission system.The realization of its speed change is to be contained in wire drawing 13 on the handgrip with manual manipulation, when wire drawing 13 pulling shift forks 11, slip three teeth that turned in the rotating shaft 8 by shift fork drive pin slide to one side on axle, and realize respectively with fixing triple gear on three gear meshing, miniature gears on the slip triple gear can with the big gear wheel engagement on the fixing triple gear, middle wheel on two gears is meshed, big gear wheel on the slip triple gear can be meshed with the miniature gears on the fixing triple gear, thereby can be according to the needs of speed, realize different speed changes, manipulate easily, and it is sturdy and durable, be a innovation greatly, will make positive contribution for the development of bicycle cause to existing bicycle shift structure.

Claims (2)

1, a kind of by casing, the speed changing box for bicycle that rotating shaft and gear constitute, it is characterized in that it being that pin turns slip triple gear (9) is housed in the rotating shaft (8), card has shift fork (11) on it, shift fork (11) is contained on the declutch shift shaft (10), declutch shift shaft (10) is fixed on the casing (1), stage clip (12) is housed on the declutch shift shaft, there is fixedly triple gear (7) identical with its size and that can be meshed on slip triple gear (9) side, triple gear (7) is installed in the rotating shaft (6), the fixed gear wheel (3) that is contained in the rotating shaft (2) is meshed with the fixing bull wheel of triple gear (7), rotating shaft (2), (6), (8) use bearing (4) to be contained on the casing (1) successively, deep bid (5) is equipped with in rotating shaft (2) on the end outside casing, shift fork (11) is gone up and through pulley the variable block wire drawing (13) of stretching out outside the casing is housed.

2, speed changing box for bicycle according to claim 1, it is characterized in that said slip triple gear (9), fixedly triple gear (7) is respectively to be made of large, medium and small three identical gears, slip triple gear (9) is to be contained in slidably in the rotating shaft (8), and fixedly triple gear (7) is is installed on rotating shaft (6) in opposite with the large, medium and small three-wheel of slip triple gear (9).

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