CN86205646U

CN86205646U - Versatcle speed reductor of manpower vehicle

Info

Publication number: CN86205646U
Application number: CN 86205646
Authority: CN
Inventors: 赵润生
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-05-17
Filing date: 1987-05-17
Publication date: 1987-11-18

Abstract

The utility model discloses a universal speed reductor, which is used for the bicycle, the tricycle, the disabled person vehicle and other manpower vehicles. So that the gear ratio is reduced when climbing, achieving the effect of labor saving, making people breezily ride up the slope with load. The utility model is mainly characterized in that the other side of the original driving chain is additionally provided with a new driving chain, and the inner side of the original chain wheel is provided with a set of gear change mechanism. The utility model has the advantages of simple structure and convenient gear change. The price is only the 1/2-1/3 of the speed change mechanism sold in the market. The utility model can also be used for the refit of the used manpower vehicles.

Description

Versatcle speed reductor of manpower vehicle

The utility model is to have designed a kind of general-duty speed reduction gearing for other rickshaws such as bicycle, three-wheel vehicle, cripple's cars.

The rickshaw of prior art particularly having under the load situation of (as having goods), is often ridden to get on when climbing the bigger sloping road of gradient, can only push to the slope to car, and it is time-consuming to require great effort.Though some rickshaw originating firm also can be produced rickshaw with a speed change mechanism, the complex structure of speed-changing mechanism, cost is also than higher.

The purpose of this utility model is: provide a kind of simple in structure, gearshift is convenient, and cheap speed decreasing mechanism is to satisfy the user, the needs that particularly vast rural area and specialist's load are climbed by bike.

To achieve these goals, the utility model has adopted following structure, is described below in conjunction with the accompanying drawings:

Fig. 1. be the gearshift scheme drawing, it is from the rickshaw front elevation in former no one lateral projection's past of chain.

Fig. 2. be the front elevation of inhibiting device.

Fig. 3 is that the A of inhibiting device is to view.

Fig. 4. for axis cuts view.

Fig. 5 is the messenger chain complete layout.

1. dual-driving chain:

On the basis of original driving-chain (sprocket wheel 10, chain and flywheel), increased again a driving-chain newly: formed by a minor sprocket 20, a chain and a flywheel. This driving-chain is contained in the opposite side of original driving-chain. Be that minor sprocket is fixed on the left crank of rickshaw. Flywheel is contained in the left side of rear axle, and chain is selected and original identical general part with flywheel. Sprocket wheel 10 originally With five screws 1 be fixed on the cam case 12, (referring to Fig. 1, Fig. 5)

The original transmitting ratio of messenger chain=(Z sprocket wheel 10)/(Z flywheel)=48/18=2.67

The messenger chain transmitting ratio=(Z that increases newly _{Minor sprocket})/(Z _Flywheel)=26/18=1.44

Speed has reduced 2.67/1.44=1.85

When climbing laborsavingly also can reach 1.85 times like this.

2 gearshifts:

The structure of gearshift can be referring to Fig. 1. and Fig. 4..It is made up of cam 2, cam case 12, slide block 6 and shifting block 7.Cam 2 is contained in rotation in the cam case 12 and is fixed together with the right crank 9 of car; Slide block 6 is contained in the radial slot of cam case 12 and can be free to slide; Shifting block 7 is contained in right crank 9 inboards.Six steel balls 3 are contained in Fig. 1, position shown in Figure 5, to increase the alerting ability of cam 2 motions.

When shifting block 7 is contained on the right crank 9, its longitudinal axis and the crank axis angle that should tilt, and also the end withstands on outside the cam case 12 on the circle, and the end can be around wring abut 8 swings simultaneously.The design-calculated purpose is like this: when slide block 6 was given prominence to cam case 12 radial slots, if sprocket wheel 10 and cam case 12 just change together, then shifting block 7 was inoperative; If sprocket wheel 10 and cam case reverse together, then shifting block 7 can advance slide block 6 in the groove.

The other also design of the radial slot of cam case 12 has a tangential slot.Built-in spring 4 and ball 5 hold out against with its slide block 6 one sides.In order to avoid during cam case 12 rotation, cause slide block 6 to drop out.

The method and the action principle of gearshift are as follows:

When rickshaw was advanced with usual speed, messenger chain originally worked.At this moment, slide block 6 is the radial slot of outstanding cam case 12 not, and shifting block 7 ends withstand on cam case 12 cylindricals gently and slide.At this moment drive path is: right crank 9-sprocket wheel 10-cam case 12-slide block 6-cam 2-axis 13-left side crank.

As when running into sloping road, people by bike can oppositely fall pedal an angle, and at this moment the curve on the cam ejects slide block 6 from groove, and slide block 6 and cam 2 are thrown off.At this moment when sprocket wheel 10 drove cam case 12 rotations, cam 2 just can not rotate, and promptly sprocket wheel 10 does not play the driving wheel effect.And the minor sprocket that is fixed on the left crank just begins to work, and drives cam 2 rotations, drives sprocket wheel 10 by axis 13 again and rotates together.At this moment, the messenger chain that increases newly works, thereby has reduced the speed of a motor vehicle.

When having climbed the slope again when level road is advanced, back-pedal is foot-operated again, and shifting block 7 ends are advanced slide block 6 in the grooves, and hangs with cam 2 and to close, and sprocket wheel 10 plays driving wheel again like this, advances with usual speed.

3 stop gears: (referring to Fig. 2 and Fig. 3)

The effect of the inhibiting device that is comprised in the gearshift is: when speed was shifted gears, the foot-operated angle of control back-pedal made gearshift accurately, promptly realizes.

Inhibiting device is made up of parts such as collision block 14, block 15, pin 16, torsion spring 17 and pipe clamps 18.

Collision block 14 is fixed on the sprocket wheel 10, and block 15 is fixed on the pipe clamp 18, and pipe clamp 18 is fixed on the vehicle frame chain stay pipe 19 of rickshaw.

When desiring the back-pedal gearshift, when collision block 14 1 is run into block 15, then the curve on the cam 2 is released radial slots (decelerations) to slide block 6 or shifting block 7 advances radial slots (becoming normal fast by low speed) to slide block 6 just just, and gearshift is finished.Simultaneously can not unrestricted motion because the pin 16 on the block 15 is blocked by the pipe 19 of vehicle frame chain stay.But when if sprocket wheel 10 is just changeing, then block 15 rotates an angle under the effect of torsion spring 17, and making it no longer limit collision block 14 is sprocket wheel 10 normal rotation.The 11st, make shifting block 7 automatically reset springs.

The utility model designer proposes a most preferred embodiment, and the number of teeth of minor sprocket is 26 teeth, and the concrete structure of shifting block 7 and inhibiting device as shown in drawings.Simultaneously, oneself makes the speed reduction gearing material object designer, the experiment proved that, and is respond well, and oneself reaches design goal, and cost only is 1/2～1/3 of the speed-changing mechanism of market sale.

Claims

1, the general speed reduction gearing of a kind of rickshaw comprises the messenger chain of being made up of original sprocket wheel 10, chain and flywheel, it is characterized in that:

A, at the opposite side of original messenger chain, increased a new messenger chain again, this messenger chain is made up of a minor sprocket 20, a chain and a flywheel, minor sprocket 20 is fixed on the left crank of rickshaw, flywheel is contained in the left side of rear axle,

B, one cover gearshift also is housed in the side of original sprocket wheel 10, this gearshift is by cam 2, cam case 12, slide block 6, form with shifting block 7, cam 2 is equipped with among the cam case 12 and with right crank 9 and is fixed together, slide block 6 is contained in the radial slot of cam case 12 and can be free to slide, shifting block 7 is contained on the medial surface of right crank 9, angle of axis tilt of its longitudinal axis of while and right crank 9, and the end withstands on the cylindrical of cam case 12, the end also can be around hinged point 8 swings, in addition, also have a tangential slot on the cam case 12, spring 4 and ball 5 are housed in the groove, ball 5 holds out against a side of slide block 6

C, gearshift also comprise an inhibiting device, inhibiting device is made up of parts such as collision block 14, block 15, pin 16, torsion spring 17 and pipe clamps 18, collision block 14 is fixed on the sprocket wheel 10, and block 15 is fixed on the pipe clamp 18, and pipe clamp 18 is fixed on the vehicle frame chain stay pipe 19 of rickshaw.