CN2330572Y - Automatic speed variator for bicycle - Google Patents

Abstract

The utility model provides a bicycle automatic gearbox, it comprises big sprocket, little sprocket, high-speed sprocket, low-speed sprocket and the connecting link between them, and it still is equipped with by shaft 16 its characterized in that, locates the epaxial centrifugal wheel 5 of this wheel, centrifugal pulley 9, the automatic gearbox that variable speed pulley 13 and high-speed gear action wheel 3, low-speed gear action wheel 1 constitute. The bicycle speed changing device has the advantages that the speed changing pulley can be driven to move under the action of centrifugal force during riding, high-speed or low-speed automatic speed changing is realized, manual operation is not needed, and the bicycle speed changing device is light, flexible, fast and comfortable during riding and is a new-generation bicycle automatic speed changing device.

Description

Automatic speed-changing device for bicycle

The utility model relates to a kind of bicycle speed-varying unit, especially a kind of in the process of moving can the self-shifting bicycle speed-varying unit.

Because bicycle is easily and fast, and low price, therefore, Chang Zuowei people's walking-replacing tool.Along with expanding economy, the bicycle kind by original single sound product, develops into multiple product now, as portable bicycle, and mountain bike, variable speed bicycle or the like.Variable speed bicycle is because of characteristics such as having and speed is variable laborsaving in the middle of this, thereby is subjected to people's welcome.But the change-speed box of existing variable speed bicycle is made of the gear of a plurality of different numbers of teeth, and speed change is manually to carry out by minor sprocket, so variable speed operation is extremely inconvenient; Moreover, because the number of teeth between adjacent gear is more or less the same, to carry out speed change speed per hour difference less when adjacent gear, and during than gear (as the 28-18 tooth) speed change of large speed differential, must be through intermediate chain wheel (as 24,20 teeth), therefore the sprocket wheel span is bigger during speed change, the speed change time is longer, the tired lock of operation, in riding in the historical facts or anecdotes border, most gears are of little use, and the chain during speed change breaks away from and often brings discomfort to the bicyclist, therefore, can not satisfy people to requirement light, quick, easy to operate, the comfortable variable speed bicycle of riding.

It is a kind of light, quick that the purpose of this utility model is to provide, and need not manually operated automatic speed-changing device for bicycle, to satisfy people's needs.

Concrete scheme of the present utility model is.It is by hinge wheel, minor sprocket, high speed sprocket wheel, low speed sprocket wheel and the connection chain between them constitute, and it is characterized in that it also is provided with by wheel shaft 16, are located at the centrifugal wheel 5 on this wheel shaft, centrifugal pulley 9, the automatic transmission with hydraulic torque converter that speed pulley 13 and high speed gear driving wheel 3, low gear driving wheel 1 constitute.Wherein, centrifugal wheel 5 is located at wheel shaft 16 1 ends, and is made of two semicircle wheels, and its outer face is fixing by spring 6, and inner end surface is connected with centrifugal pulley 9 by torque arm 8; Low gear driving wheel 1 is located at wheel shaft 16 other ends, which is provided with speed change knock hole 15; Also be provided with minor sprocket 2 and the high speed gear driving wheel 3 which is provided with speed change knock hole 18 on the wheel shaft 16, between them, be provided with speed pulley 13, speed pulley 13 two ends are equipped with speed change radius stay 14, and respectively with high speed gear driving wheel 3 and low gear driving wheel 1 on speed change knock hole 18,15 matched, this speed pulley is connected with centrifugal pulley 9 by pull bar 11, so that under this centrifugal pulley drives, make speed pulley 13 left and right moving, realize at a high speed or the low speed variation; Minor sprocket 2 on the wheel shaft 16 is connected with hinge wheel 19 by chain 24, low gear driving wheel 1 is connected with low gear flower wheel 20 by another chain 22, high speed gear driving wheel 3 is connected with high speed gear flower wheel 21 by another chain 23, is convenient to realize transmission process.

The utility model compared with prior art has following advantage and extremely long-pending effect: owing to be provided with centrifugal wheel, and be connected with speed pulley by pull bar, therefore, in the process of riding, can drive speed pulley by centrifugal action and move, realize at a high speed or low-tach automatic speed changing, need not M/C, and light and flexible when riding, comfortable fast, real is automatic bicycle speed variator of new generation.

Fig. 1 is the structural representation of the utility model.

The specific embodiment that provides below in conjunction with accompanying drawing is described further the utility model, is not limited only to this but hold within the utility model.

Among the figure, 1 is the low gear driving wheel, be located at wheel shaft 16 1 ends, which is provided with speed change knock hole 15,2 is minor sprocket, it is a directed ratchet, its function is identical with the minor sprocket of ordinary bicycle, promptly just changeing just work, counter-rotating is not worked, this minor sprocket is located on the wheel shaft 16, which is provided with speed change positioning groove 25, so that speed change radius stay 14 passes through, 3 is the high speed gear driving wheel, be located on the wheel shaft 16, which is provided with speed change knock hole 18,4 is pedestal, is located on the back fork of bicycle 27,5 is centrifugal wheel, be located at the other end of wheel shaft 16, it is made of two semicircle wheels, is fixed with spring 6 by screw 7 on its outer face, 8 are torque arm, the one end is connected with centrifugal wheel 5, and the other end is connected with centrifugal pulley 9, and 9 is centrifugal pulley, be located on the wheel shaft 16, be connected with pull bar 11 1 ends by fastening nail 10, the other end of pull bar 11 is connected with speed pulley 13 by fastening nail 10, and 13 is speed pulley, be located on the wheel shaft 16, its outer end and the inner are provided with speed change radius stay 14, and respectively with low, speed change knock hole 15 and 18 on the high speed gear driving wheel is matched, and wherein speed change radius stay 14 passes the speed change positioning groove 25 on the minor sprocket 2,19 is hinge wheel, be located on the bicycle pedal axle 28, be connected 20 with minor sprocket 2 by chain 24,21 are respectively low, the high speed gear flower wheel, be located on the bicycle rear shaft 26 together, and pass through chain 22 and 23 respectively with low accordingly, high speed gear driving wheel 1 is connected with 3.

Its working process is: during quiet car, speed change radius stay 14 is arranged in the speed change knock hole 15 on the low gear driving wheel 1, when riding, hinge wheel 19 on the bicycle pedal axle 28 drives minor sprocket 2 and rotates, make with low gear driving wheel 1 on the wheel shaft 16 and centrifugal wheel 5 and rotate simultaneously, make low gear flower wheel 20 drive bicycle rear to overtake by chain 22.Because speed ratio is bigger, when flower wheel 20 changeed for 1.7 weeks, driving wheel 1 changeed for 3.7 weeks, coaxial centrifugal wheel 5 also rotates thereupon, when speeding up, two centrifugal semicircle wheels overcome spring 6 pulling force and separate under centrifugal action, and move right by the centrifugal pulley 9 of torque arm 8 pulling, driving speed pulley 13 by pull bar 11 simultaneously moves to right, make speed change radius stay 14 left ends break away from low gear driving wheel knock hole 15, and speed change radius stay 14 right-hand members enter in the high speed gear driving wheel knock hole 18, drive this high speed gear driving wheel and rotate, and by chain 23 high speed gear flower wheel 21 are rotated again, thereby drive and sail bicycle and move fast, when the speed of a motor vehicle is slack-off, two centrifugal semicircles wheels are closed up, by torque arm 8 and with centrifugal pulley 9 to left translation, pull bar 11 is also to moving to left, speed pulley 13 is moved to left, enter low cruise, thereby realize the automatic speed changing process.

Claims (5)

1, a kind of automatic speed-changing device for bicycle, it is by hinge wheel, minor sprocket, the high speed sprocket wheel, low speed sprocket wheel and the connection chain between them constitute, it is characterized in that it also is provided with by wheel shaft (16), be located at the centrifugal wheel (5) on this wheel shaft, centrifugal pulley (9), the automatic transmission with hydraulic torque converter that speed pulley (13) and high speed gear driving wheel (3), low gear driving wheel (1) constitute.

2, change-speed box according to claim 1 is characterized in that centrifugal wheel (5) is located at wheel shaft (16) one ends, and is made of two semicircles wheels, and its outer face is fixing by spring (6), and inner end surface is connected with centrifugal pulley (9) by torque arm (8).

3, change-speed box according to claim 1 is characterized in that low gear driving wheel (1) is located at wheel shaft (16) other end, which is provided with speed change knock hole (15).

4, change-speed box according to claim 1, the high speed gear driving wheel (3) that it is characterized in that also being provided with minor sprocket (2) on the wheel shaft (16) and which is provided with speed change knock hole (18), between them, be provided with speed pulley (13), speed pulley (13) two ends be equipped with speed change radius stay (14) and respectively with high speed gear driving wheel (3) and low gear driving wheel (1) on speed change knock hole (18) and (15) matched, this speed pulley (13) is connected with centrifugal pulley (9) by pull bar (11).

5, change-speed box according to claim 1, it is characterized in that the minor sprocket (2) on the wheel shaft (16) is connected with hinge wheel (19) by chain (24), low gear initiatively car (1) is connected with low gear flower wheel (20) by another chain (22), and high speed gear driving wheel (3) is connected with high speed gear flower wheel (21) by another chain (23).

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