CN2412834Y

CN2412834Y - Transmission of bicycle

Info

Publication number: CN2412834Y
Application number: CN00206763U
Authority: CN
Inventors: 伍荣华
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-04-06
Filing date: 2000-04-06
Publication date: 2001-01-03
Anticipated expiration: 2010-04-06

Abstract

The utility model relates to a transmission mechanism of a bicycle. Both sides of a big chain wheel of a centre shaft of a bicycle are respectively provided with a crank which can be trodden to move up and down; two fly teeth on the crank shaft end are respectively connected with chain wheels on two gear shafts in a positioning gear on the upper part through a chain; the big chain wheel uses the chain for connecting with a fly tooth of a rear wheel of a bicycle by a bridge wheel. When one of the cranks is trodden to move downwards, the rear wheel of a bicycle can be driven to move forward by the transmission of the chain, and simultaneously, because of the action of the positioning gear, the other crank can move upwards; therefore, the cranks are trodden to move up and down to drive a bicycle. The utility model changes the treading and riding mode of bicycles. Optimal transmission effect can be found through the regulation of the length of the cranks to achieve the purpose that the bicycles can be ridden with portability and labor saving.

Description

A kind of bicycle drive

The utility model relates to bicycle power transmission field, the later-model driving device of specifically a kind of bicycle.

At present, known bicycle type of drive all is the crank rotation, and the tooth that flies that drives on the hind axle by chain gear makes trailing wheel rotate the realization operation.And the weak point of crank rotation transmission maximum is to revolve in the three-sixth turn at crank, and wherein effective angle has only about 140 degree, and it almost is " idle work " zone that the dead angle up and down about 80 degree is arranged in other anglecs of rotation.The length of crank directly has influence on the output of power size simultaneously, and present type of drive limits the out of reach ideal dimensions because of being subjected to the human physilogical characteristic.

The purpose of this utility model is to provide a kind of later-model bicycle drive, be equipped with two in axis the place ahead and only make the crank that pumps, make bicycle keep travelling forward by Positioning Gear and bridge wheel, because the crank size can increase, meet the human physilogical characteristic, thus the high purpose of laborsaving effect when reaching by bike.

By a kind of bicycle drive that the utility model proposes, in bicycle middle shaft hinge wheel both sides, but the crank of two up-and-down movements is housed, the middle axle head of two cranks respectively is equipped with one and flies tooth, on the vehicle frame of hinge wheel top one group of Positioning Gear is housed, the sprocket wheel of adorning on two gear wheel shafts in the Positioning Gear flies tooth with two of crank end respectively by chain and is connected, on hinge wheel and trailing wheel fly vehicle frame between the tooth, fix one group of bridge wheel, by chain kinergety is transferred to trailing wheel by hinge wheel and flies on the tooth.

Fig. 1 is the utility model structural representation.

Fig. 2 is crank structure figure in the left and right sides in the utility model.

Fig. 3 is Positioning Gear structure and a generalized section in the utility model.

Fig. 4 is the utility model bridge wheel construction and generalized section.

Embodiment is explained in detail the utility model below in conjunction with accompanying drawing.

On the axis (1) of cycle frame, near hinge wheel (2) being housed the vehicle frame position.A crank (3a), (3b) respectively are equipped with in hinge wheel and vehicle frame both sides on axis, and the axle head of crank respectively is equipped with one and flies tooth (7), and the two teeth directional is opposite, and the length of crank be best bestly bringing into play the Human Physiology limitation of the movement.On the vehicle frame of hinge wheel (2) top, be installed with one group of Positioning Gear (4), the framework of Positioning Gear (8) is fixed on the vehicle frame, have in the framework a pair of gear (9), (10) near, about 1/3rd section places at the girth of two gears have tooth can agree with rotation mutually, the anodontia position contact of two gears is as positioning and fixing, draw outside the framework axle of two gears (11), (12), one sprocket wheel (13), (14) respectively are housed, and sprocket wheel (13), (14) link to each other with the tooth (7) that flies of crank (3b), (3a) axle head respectively by driving chain.On hinge wheel (2) and bicycle rear fly vehicle frame between the tooth (6), one group of bridge wheel (5) is housed, it is by a hinge wheel (15) and a minor sprocket (16) coaxial composition, hinge wheel (15) is connected with chain with axis hinge wheel (2), and minor sprocket (16) flies tooth (6) with trailing wheel and is connected with chain.

The utility model is operation like this: when stepping on one side crank (3a) when moving downward, hinge wheel just drives trailing wheel by chain through the bridge wheel travels forward bicycle, at the same time, the tooth that flies of crank (3a) axle head rotates by one group of gear (9), (10) that chain drives in the Positioning Gear, makes crank (3b) upward movement.At this moment, the crank (3b) of stepping on another side again moves downward, and travel forward and add a power to bicycle, and crank (3a) upward movement simultaneously.Make two crank up-and-down movements thus, bicycle is driven forwards.

The utility model as long as adjust, meets each one physilogical characteristics owing to changed the mode of riding of stepping on of bicycle on the length of crank, find best transmission effect easily, reaches brisk by bike and the labour-saving purpose.

Claims

1, a kind of driving device of bicycle is characterized in that in bicycle middle shaft hinge wheel both sides two cranks being housed, and the middle axle head of two cranks respectively is equipped with one and flies tooth, and both teeth directionals are opposite; On the vehicle frame of hinge wheel top one group of Positioning Gear is housed, the sprocket wheel of adorning on two gear wheel shafts in the Positioning Gear flies tooth with two of crank end respectively by chain and is connected.

2, press the driving device of the described a kind of bicycle of claim 1, it is characterized in that on axis hinge wheel and bicycle rear fly vehicle frame between the tooth, one group of bridge wheel is housed, it was flown tooth with chain and bicycle rear respectively and is connected with the axis hinge wheel by a hinge wheel and minor sprocket coaxial composition.

3, by the driving device of claim 1 or 2 described a kind of bicycles, it is characterized in that having in the Positioning Gear a pair of gear near, at Zhou Changyue 1/3rd section places of two gears tooth is arranged, and can agree with rotation mutually.