CN206520717U

CN206520717U - Folding crank bicycle

Info

Publication number: CN206520717U
Application number: CN201621229525.3U
Authority: CN
Inventors: 刘英凯
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-11-09
Filing date: 2016-11-09
Publication date: 2017-09-26
Anticipated expiration: 2026-11-09

Abstract

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

Description

Folding crank bicycle

Technical field

The utility model folding crank bicycle, is related to bicycle manufacturing industry, and one kind uses folding two sections of bicycles Crank, gradually changes 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.In order to which the leg for reducing people during cycling is exerted oneself, generally using reduction The mode of speed.By change pulley, change the sprocket wheel of crank handle turns and the gearratio of bicycle rear, both legs is 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, increasing crank length, although use the leg that cyclist can be reduced Power.But, the motion amplitude of both legs can be increased, is unfavorable for both legs to pedal, also, leg exercise limited extent；Increase crank long Degree, is also limited by bicycle pedal with ground minimum range.

The content of the invention

The utility model folding crank bicycle, with two sections of folding cranks, replaces existing one section of crank of bicycle.Greatly Crank one passes through fixed chain wheels one, chain, mobile sprocket wheel one, the folder for rotating small crank one, change big crank one and small crank one Angle, the straight length generating period change of two sections of folding cranks.Big crank one is connected with bicycle rear shaft, drives hind axle Rotation, one end of the other end and small crank one is coaxial, and the other end and pedal of small crank one are coaxial.

Fixed chain wheels one are fixed together with vehicle frame, and fixed chain wheels one are drawn by chain with mobile sprocket wheel to be connected, big crank One around bicycle rear shaft rotate when, under the constraint of chain, mobile sprocket wheel one is moved by the center of circle of bicycle rear shaft, with The small crank one that mobile sprocket wheel one is connected remains that a direction is constant.

As shown in figure 3, straight equal to big crank two and small crank two when the straight length of big crank two and small crank two is most long Line length sum；The straight length of big crank one and small crank one be most equal in short-term big crank one and the straight length of small crank one it Difference.

When sprocket wheel and chain are installed, by chain and fixed chain wheels and the occluding relation of rotating sprocket, two suites are adjusted The initial position of handle.On the premise of two pedal radiuses of action are not increased, when to pedal, make the pedal and bicycle of stress Distance is elongated between hind axle, the arm of force is increased, in the case where torque is constant, it is possible to reduce exert oneself leg；What is do not stressed is foot-operated Distance Shortened between plate and bicycle rear shaft, reduces the scope of activities of 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, when to pedal, hind axle is relative with trailing wheel motionless, downhill path or without to pedal when, hind axle it is relative with trailing wheel turn Dynamic, bicycle is run by inertia or external force.Hind axle and trailing wheel synchronous rotary when to pedal, hind axle is with trailing wheel when not to pedal Relatively rotate.

Brief 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- is big Crank one, 4- small cranks one, 7- pedals.

Fig. 2 is folding crank bicycle drive graphics, and each unit number and title are as follows：3- big cranks one, 4- Small crank one, 5- big cranks two, 6- small cranks two, 7- pedals, 8- rear wheel axle sleeves, 9- rear vehicle shafts, 10- fixed chain wheels One, 11- move sprocket wheel one, 12- chains, 13- flower-drum.

Fig. 3 folding crank bicycle drives, the graphics when big crank is parallel with small crank, each unit number It is as follows with title：3- big cranks one, 4- small cranks one, 5- big cranks two, 6- small cranks two, 7- pedals, 8- rear wheel axle sleeves, 9- rear vehicle shafts, 10- fixed chain wheels one, 11- movement sprocket wheels one, 12- chains, 13- flower-drum.

Embodiment

Implement the utility model folding crank bicycle, first have to what is directly driven according to folding crank bicycle rear wheel Feature, manufactures and designs vehicle frame, at present, and the production technology of bicycle is ripe, and the bicycle production line that can produce common vehicle frame all may be used To produce folding crank cycle frame.

Folding crank bicycle drive makes, with common mechanical processing technique it is achieved that selected axle Hold as standard component.Other bicycle parts of folding crank bicycle can be with ordinary bicycle universal component.Fold 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 is simple in construction with laborsaving in the case where torque is constant, the features such as easy to maintenance.

Claims

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

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

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

4. folding crank bicycle according to claim 1, its technical characteristic is：Mobile sprocket wheel one is fixed with small crank one Together, under the constraint of chain, move, do not rotate by the center of circle of hind axle.

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