CN108068970A

CN108068970A - Folding crank bicycle

Info

Publication number: CN108068970A
Application number: CN201611006661.0A
Authority: CN
Inventors: 刘英凯
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-11-09
Filing date: 2016-11-09
Publication date: 2018-05-25

Abstract

Folding crank bicycle of the present invention is related to bicycle manufacturing industry, a kind of bicycle for as the vehicles or sports equipment.Existing bicycle crank length is fixed, and generally use gear shift mode reaches labour-saving purpose, changes gearratio, and leg can firmly mitigate, and still, the speed of bicycle also accordingly reduces.Folding crank bicycle solve technical solution be：Using folding two groups of two sections of bicycle cranks, gradually change the straight length of two sections of cranks in bicycle operation, drive bicycle rear shaft rotation.When to pedal, under conditions of two foot pedal radiuses of action are not increased, make distance between the foot pedal of stress and bicycle rear shaft elongated, increase the arm of force, reduce leg and exert oneself；Distance Shortened between the foot pedal and bicycle rear shaft that do not stress reduces leg movements scope.The transmission device of folding crank bicycle can be applied to by the occasion of the connecting rod drive shaft rotation of alternating movement.

Description

Folding crank bicycle

Technical field

Folding crank bicycle of the present invention is related to bicycle manufacturing industry, a kind of to use folding two sections of bicycle cranks, Gradually change the straight length of two sections of cranks, the bicycle of driving bicycle rear shaft rotation in bicycle operation.

Background technology

The crank length of existing bicycle is fixed.The leg of people is exerted oneself during in order to reduce cycling, and generally use reduces The mode of speed.By change pulley, change the sprocket wheel of crank handle turns and the gearratio of bicycle rear, both legs is made to be applied to crank Torque change；This mode is although laborsaving, still, reduces the speed of service of bicycle.

If in the case where crank torque is constant, increase crank length, although the leg that can reduce cyclist is used Power.But the motion amplitude of both legs can be increased, it is unfavorable for both legs to pedal, also, leg exercise limited extent；It is long to increase crank Degree, is also limited be subject to bicycle pedal and ground minimum range.

The content of the invention

Folding crank bicycle of the present invention with two sections of folding cranks, substitutes existing one section of crank of bicycle.Big crank 1 is connected with bicycle rear shaft, and one end of the other end and small crank 1 is coaxial, and the other end and foot pedal of small crank 1 are coaxial.

Fixed chain wheels 1 are fixed together with vehicle frame, and fixed chain wheels 1 are connected by chain with mobile sprocket wheel 1, and big crank 1 encloses When being rotated around bicycle rear shaft, under the constraint of chain, mobile sprocket wheel 1 is moved by the center of circle of bicycle rear shaft, with movement The small crank 1 that sprocket wheel 1 connects remains that a direction is constant, realizes that big crank 1 and 1 straight length of small crank periodically become Change.

As shown in figure 3, it is equal to 2 length of big crank 2 and small crank when the straight length of big crank 2 and small crank 2 is most long The sum of degree；The straight length of big crank 1 and small crank 1 is most equal to the difference of 1 straight length of big crank 1 and small crank in short-term.

When sprocket wheel and chain are installed, by two groups of chains and fixed chain wheels and the occluding relation of rotating sprocket, two are adjusted The initial position of suite handle.On the premise of two foot pedal radiuses of action are not increased, to pedal when, make the foot pedal of stress with from Distance is elongated between driving hind axle, the arm of force is increased, in the case where torque is constant, it is possible to reduce exert oneself leg；It does not stress Distance Shortened between foot pedal and bicycle rear shaft reduces the scope of activities of people's leg.

The hind axle of folding crank bicycle is rotated with crank on vehicle frame, is equipped between hind axle and rear wheel axle sleeve Bicycle drive shaft, to pedal when, hind axle is opposite with trailing wheel motionless, downhill path or without to pedal when, hind axle it is opposite with trailing wheel turn Dynamic, bicycle is run by inertia or external force.

Description of the drawings

Fig. 1 is the graphics of folding crank bicycle, and each unit number and title are as follows：1- vehicle frames, 2- rear wheels, 3- are big Crank Isosorbide-5-Nitrae-small crank 1,7- foot pedals.

Fig. 2 is folding crank bicycle drive graphics, and each unit number and title are as follows：3- big cranks Isosorbide-5-Nitrae-small Crank 1,5- big cranks 2,6- small cranks 2,7- foot pedals, 8- rear wheel axle sleeves, 9- rear vehicle shafts, 10- fixed chain wheels 1,11- are moved Movable sprocket 1,12- chains, 13- flower-drum.

Fig. 3 folding crank bicycle drives, the graphics when big crank is parallel with small crank, each unit number with Title is as follows：3- big cranks Isosorbide-5-Nitrae-small crank 1,5- big cranks 2,6- small cranks 2,7- foot pedals, 8- rear wheel axle sleeves, 9- rear cars Wheel shaft, 10- fixed chain wheels 1,11- movement sprocket wheels 1,12- chains, 13- flower-drum.

Specific embodiment

Implement folding crank bicycle of the present invention, first have to the spy directly driven according to folding crank bicycle rear wheel Point manufactures and designs vehicle frame, and at present, the production technology of bicycle is ripe, and the bicycle production line that can produce common vehicle frame can Produce folding crank cycle frame.

Folding crank bicycle drive makes, with common mechanical processing technique it is achieved that selected axis It holds as standard component.Other bicycle parts of folding crank bicycle can be with the universal component of ordinary bicycle.It folds bent Handle bicycle drive cannot only be applied on bicycle, is also applied to and is revolved with the connecting rod drive shaft of alternating movement On the device turned.

Folding crank bicycle have it is laborsaving in the case where torque is constant, it is simple in structure, it is easy to maintenance the features such as.

Claims

1. a kind of folding crank bicycle, it is characterized in that：The crank of folding crank bicycle rear shaft rotation is driven, it can by two sections It is formed with the crank of folding, big crank 1 rotates small crank 1, change big crank 1 by fixed chain wheels 1, chain, mobile sprocket wheel 1 With the angle of small crank 1, the straight length generating period variation of two sections of folding cranks.

2. folding crank bicycle big crank 1 according to claim 1, it is characterized in that：Big crank 1 is fixed on folding crank On bicycle rear wheel axis, rear vehicle shaft rotation is driven.

3. folding crank bicycle fixed chain wheels 1 according to claim 1, it is characterized in that：Fixed chain wheels 1 are fixed on folding On crank bicycle vehicle frame, do not rotate.

4. folding crank bicycle according to claim 1 moves sprocket wheel 1, technical characteristic is：Mobile sprocket wheel 1 and Chinese yeast Handle 1 is fixed together, and under the constraint of chain, moves, does not rotate by the center of circle of hind axle.

5. folding crank bicycle rear shaft according to claim 1, it is characterized in that：Hind axle is rotated compared with vehicle frame； Hind axle and trailing wheel synchronous rotary when to pedal, hind axle are relatively rotated with trailing wheel when not to pedal.