CN1027627C

CN1027627C - High-efficiency chain transmission mechanism for bicycle

Info

Publication number: CN1027627C
Application number: CN 91102617
Authority: CN
Inventors: 罗寿宝
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-04-22
Filing date: 1991-04-22
Publication date: 1995-02-15
Anticipated expiration: 2006-04-22
Also published as: CN1066033A

Abstract

A high-efficiency chain transmission mechanism for a bicycle changes the circular motion of pedals in the prior art into alternate linear reciprocating motion, and solves the problems of low transmission efficiency and large idle work in the prior art. The mechanism is in a two-stage chain transmission mode, and the reciprocating motion of pedals is converted into continuous unidirectional rotation motion through a chain wheel-ratchet wheel assembly. The mechanism has high transmission efficiency, compact and simple structure and reliable transmission, and can be used as a transmission mechanism on a bicycle.

Description

Efficient chain-drive mechanism for bicycle

The present invention is the driving device of the wheeled car that drives of a kind of person of taking advantage of, particularly a kind of efficient chain-drive mechanism for bicycle.

Bicycle of the prior art is made circular movement by foot-operated, realizes travelling forward of bicycle by sprocket wheel, chain, flywheel, transmission trailing wheel.Because the force of the directed force F that people's pin produces is when making circular movement, the effective force that drives the pedal spindle rotation is the tangent line component f of F, as the direction of F and size are all regarded as constant, then the size of f is the variation of sinusoidal function relation in [A, B] interval displacement with acting point.As the motion distance of establishing the force is S, and then the merit that F did is: W _F=FS, the merit that f did is:

W ₁=fS=SF1/ π ∫ ^π ₀Sinxdx=2/ π FS ≈ 0.64FS. is that efficient is: η=(W _f/ t)/(W _p/ t) ≈ 0.64(t is the time).That is to say that the foot-operated driving efficiency of making circular movement only is 0.64.This as people go up a slope at a slow speed by bike can realize often like that: when the position of foot-operated point of action is in the distance at A, B two dead points when near more, just do not use power more, promptly more little to the proal useful effect power of car spare; When point of action was in the position at dead point fully, no matter the person's of taking advantage of two legs used great power, can not cut any ice to moving ahead of car spare.(seeing Fig. 1～3)

The object of the present invention is to provide a kind of efficient chain-drive mechanism for bicycle.What do reciprocating linear motion rides by an open kinematic chain and the sprocket wheel-ratchet group that is engaged with, and straight-line motion is converted to unidirectional rotation and drives another chain wheel set and a closed kinematic chain, and transmission of power is arrived rear wheel.

Technical solution of the present invention is: constitute transmission device by I, II two-stage chain-driving.Main of I level chain-driving part is made up of open kinematic chain 3, foot-operated

assembly

1 and 6, guide groove 2 and sprocket wheel-ratchet assembly 9 and 10.Sprocket wheel-ratchet assembly is that outer shroud is the interior mesh ratchet gear of sprocket wheel, and this two assembly can transmit unidirectional unidirectional rotation.Chain 3 is along two sprocket engagement of anti-serpentine trend with

part

9 and 10,

part

9 and 10 lays respectively at inside and outside two sides of chain line, the two ends of chain penetrate with foot-operated assembly 6 from two chambeies, front and back of guide groove 2 respectively downwards and are connected with 1, and foot-operated roller can do reciprocating linear motion in guide groove.(seeing Fig. 4,7) guide groove 2 sections are " H " shape, are somebody's turn to do relative invagination 90 degree in termination of two straight flanges of " H ", form two chambeies, front and back of opening.(see figure 6) chain 3, sprocket wheel-

ratchet assembly

9 and 10 and guide groove on two longitudinal centerlines in two chambeies be positioned at same plane of movement.Except that main part, restrict 4 in addition, damper element 5, pulley 7 and jockey pulley 8.Rope is walked around pulley 7, and two ends upwards penetrate guide groove two chambeies respectively and are connected with 1 with part 6, works to guarantee chain and sprocket normal engaged when car body is acutely beated.Two damper elements 5 are positioned at the lower end of guide groove 2, and the impact when moving downward to the smallest limit position to two steps respectively plays buffer action.Jockey pulley 8 and chain 3 engagements between part 9 and part 10 2 sprocket wheels, work to increase part 9 engagement wrapping angle.This jockey pulley can omit, and the open kinematic chain trend after the omission, annexation do not become.Main of (see figure 5) II level chain-driving part by closed kinematic chain 14, and

sprocket wheel

11,12 and 15 is formed.Part 14 and

part

11,12 and 15 engagements, 11,12 and two drive sprockets of part, respectively with the part 10 of I level chain-driving part with 9 coaxial ratchet and captive joint, part 15 is by movable sprocket,

part

11,12 and 15 is within the chain link of part 14.Chain 14,

sprocket wheel

11,12 and 15 are positioned at same plane of movement.Except that main part, also have jockey pulley 13, with part 14 engagements, be positioned at outside the chain link, work to increase part 12 engagement wrapping

angle.Jockey pulley

13 and 8 is coaxial.(seeing Fig. 4,7)

When two foot-operated when making alternately linear reciprocating motion under external force, chain 3 driving chain wheels that are attached thereto-

ratchet assembly

9 and 10, and then will rotate counterclockwise (i.e. foot-operated 1 and 6 move downward)

driving chain wheel

12 and 11 by ratchet shaft, drive by movable sprocket 15.Because the one-way movement that II level running part is accepted is continuous, thereby realize the unidirectional continuous running of part 15.

The present invention has following advantage compared to existing technology:

1. driving efficiency height.Foot-operated application force acts on sprocket wheel by chain, and its active line is tangent with sprocket wheel all the time, and foot-operated application force all is a useful effect power, i.e. F=f, and efficient has improved 0.56 times of (FS-2/ π FS/(2/ π FS) ≈.

2. the tight Minato of structure, simple, reliable transmission.

The drawing explanation of accompanying drawing: Fig. 1～3 are the prior art scheme drawing, and Fig. 4～7 are scheme drawing of the present invention, and Fig. 8～15 are embodiment of the invention scheme drawing and machine drawing.Be followed successively by down:

Fig. 1 is the prior art constructions scheme drawing.

Fig. 2, Fig. 3 are the application force decomposing schematic representation of the foot-operated circular movement of doing among Fig. 1.

Fig. 4 is a whole structural scheme of mechanism of the present invention.

Fig. 5 omits the I level chain-driving part scheme drawing of jockey pulley 8 for the present invention.

Fig. 6 is the schematic cross section of guide groove 2 of the present invention.

Fig. 7 is the expansion scheme drawing of I of the present invention, II level chain-driving part.Wherein 1 and 6 are foot-operated assembly, and 2 is guide groove, and 3 is I level chain, and 4 are rope, and 5 is damper element, and 7 is pulley, and 8 and 13 is jockey pulley, and 9 and 10 is sprocket wheel-ratchet assembly, and 11,12 and 15 is sprocket wheel, and 14 is II level chain.

Fig. 8 is the overall machine drawing of the embodiment of the invention.Mark guide groove component (I), ratchet part (II) and follower parts (III) among the figure.Parts (I) comprise the part 1～7 among Fig. 7, and parts (II) comprise the part 8～13 among Fig. 7, and parts (III) comprise the

part

14,15 among Fig. 7.

Fig. 9 is the amplification view of guide groove component among Fig. 8 (I) and ratchet part (II).

Figure 10 is that the K of guide groove component among Fig. 9 (I) is to view.Draw the annexation up and down of foot-operated assembly among the figure.

Figure 11 is the B-B cutaway view of Figure 10.Overstriking black line among the figure partly is the section of guide groove.

Figure 12 is the C-C amplification view of Figure 10, further shows the annexation of foot-operated assembly and the section shape of guide groove.

Figure 13 is the expansion enlarged drawing of ratchet part (II) and follower parts (III).Draw the annexation between I level running part of the present invention and the II level running part among the figure.

Figure 14 is the amplification complete section figure of Figure 13 middle sprocket-

ratchet assembly

9,10.

Figure 15 partly cuts open figure for the amplification of

jockey pulley

8,13 among Figure 13.

The spare part sequence number that marks among spare part sequence number and Fig. 7 of mark in Fig. 8～15 is corresponding consistent.

Embodiment is applied to a scheme on the common A type bicycle for the present invention, and 8～15 do further narration in conjunction with the accompanying drawings: press under the saddle of bicycle: " people " font is provided with this efficient chain-drive mechanism along foot-operated direction and back wheels of vehicle direction of principal axis.Ratchet part (II) is positioned under the saddle; Guide groove component (I) is arranged in the place ahead of the inclined tube under saddle of bicycle tripod, and substitutes this inclined tube; Follower parts (III) are positioned on the bicycle rear shaft, are connected with floral disc.The transmission device that the present invention can be used as on the bicycle uses.

Claims

1, a kind of efficient chain-drive mechanism for bicycle, the open kinematic chain 3 of I level chain-driving part and two sprocket wheels, one ratchet assembly 9 and 10 engagements, two ends penetrate with foot-operated assembly 6 from two chambeies, front and back of guide groove 2 respectively downwards and are connected with 1, rope 4 is walked around pulley 7, two ends upwards penetrate guide groove two chambeies respectively and are connected with 1 with part 6, sprocket wheel one ratchet assembly is that outer shroud is the interior mesh ratchet gear of sprocket wheel, jockey pulley 8 and chain 3 engagements, between part 9 and 10 2 sprocket wheels, the chain 14 and the sprocket wheel 11 of II level running part, 12 and 15 engagements, sprocket wheel 11,12 and 15 are positioned within the chain link, jockey pulley 13 meshes with chain 14 outside chain link, it is characterized in that I level chain 3 is along two sprocket engagement of anti-serpentine trend with two sprocket wheels, one ratchet assembly 9 and 10, part 9 and 10 lays respectively at inside and outside two sides of chain line, chain 3, two sprocket wheels, one ratchet assembly 9 and 10 and guide groove 2 on two longitudinal centerlines in two chambeies be positioned at same plane of movement, the drive sprocket 11 of II level chain-driving part, 12 is two, be positioned at same plane of movement, respectively with the part 10 of I level chain-driving part with 9 coaxial ratchet and captive joint, 2 faces of guide groove are " H " shape, relative invagination 90 degree in the termination that two straight pens of this " H " are drawn, form two chambeies, front and back of opening, two jockey pulleys 13 and 8 are coaxial.