CN2165090Y

CN2165090Y - Labour-saving acceleration chain wheel

Info

Publication number: CN2165090Y
Application number: CN 93238932
Authority: CN
Inventors: 沈乃昌
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-06-28
Filing date: 1993-06-28
Publication date: 1994-05-18
Anticipated expiration: 2003-06-28

Abstract

The utility model provides a labour-saving acceleration chain wheel. The utility model is characterized in that a pitch circle line of the chain wheel is made up of two sections of principal curves; each section of the principal curve has a labour-saving curve and an accelerative curve connected to the labour-saving curve; the structure is neither a circular structure nor an ellipsoidal structure, but a structure which adopts irregular curves to coil the perturbation of a shaft line to form an outline similar to a potato. The changes of twice labour saving and twice acceleration happen when a chain wheel rotates one round. The utility model can be used on various types of bicycles, tricycles, hand cars for disabled persons, racing vehicles, manpower driving chain devices, etc.

Description

Labour-saving acceleration chain wheel

The utility model relates to a kind of chain drum that can be used on the bicycle, particularly be a kind of energy-saving speedup chain drive.

China has the maximum country of bicycle in the world, at present on the China market with regard to the bicycle chain drum, it is main that what adopt is positive circular chain drum, neither laborsaving when being used for riding on the bicycle again can not speedup.

In view of above reason, the purpose of this utility model for provide a kind of can be supporting with bicycle etc., can be laborsaving when riding again can speedup the wide energy-saving speedup chain drive of purposes.

The pitch circle line of the utility model chain drum is made up of two sections principal curves, have respectively in every section principal curve province's force curve, with economize force curve bonded assembly speedup curve (referring to Fig. 1), ride a circle can twice speedup, twice laborsaving.

Initial province force curve is arranged in above-mentioned province's force curve, economize the best that force curve joins and economize force curve with initial, the initial force curve of economizing is from shortest distance r1 〉=the best province force curve of chain drum central axis ultimate range r2 from the chain drum central axis, the shortest distance r3 of speedup curve decentering axis 〉=initially economize force curve from the ultimate range r4(of chain drum central axis referring to Fig. 1).

Also have two ends to economize the linear portion (referring to Fig. 1) of force curve and speedup contact of a curve respectively with the best in above-mentioned province's force curve, adopt linear portion can make the chain drum rotation big by the laborsaving state of the best moment speedup, speedup.

The ratio of the long axis length l1 of above-mentioned chain drum and minor axis length l2: l1:l2=(1.20～1.35): 1(is referring to Fig. 2).

The major axis line of centers of above-mentioned chain drum transfers 0～30 ° (referring to Fig. 2) to by anticlockwise direction, the optimum angle when being chain drum and crank riveted with respect to the angle α of foot-operated crank center line.

The best when the major axis line of centers of above-mentioned chain drum transfers 30 ° with respect to the angle α that rides the crank center line to by anticlockwise direction.

The above-mentioned chain drum periphery number of teeth is 25～53 teeth, can choose according to different purposes, can be odd number, also can be even numbers.

The utility model chain drum is changed traditional positive circular configuration, non-again ellipsoidal structure.Adopted fitfull curve or irregular curve and straight line chain drum (being that chain drum pitch circle line has radial variations) around the chain disk axis formed outer likeness in form of fluctuating " potato ".Chain-coiling circles, and the function of twice laborsaving and twice speedup is arranged, and forms the benign cycle of the laborsaving again speedup again of laborsaving speedup in the chain drum slew mode.Chain-coiling circles, have to economize 75% laborsaving zone, load-carrying or when going up a slope operation laborsaving effect particularly evident, laborsaving when maximum, can reduce 25～35% of pin driving pressure.The utility model is simple in structure, shop characteristic is good, is easy to batch manufacturing, and cost is low, operation is rapid, and purposes is wide, can be used in various bicycle, three-wheel vehicle, handcar for disabled persons, racing car, the manpower messenger chain device etc.

Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing:

Fig. 1 is the utility model structural representation

Fig. 2 is crank installation site figure

Having formed chain drum pitch circle line 3 with reference to the identical principal curve 1,2 of 1, two section shape of figure has formed chain drum outward neither the chain drum of positive circle non-again oval-shaped similar " potato " shape.In the principal curve 1,2 province's force curve 4 is arranged respectively, speedup curve 5.The every bit on province's force curve 4, the speedup curve 5 and the distance of chain drum central axis are constantly to change.Economizing has initial province force curve 6, economizes the tangent linear portion 8 of force curve 7 and speedup curve 5 with the best respectively with initial best force curve 7, the two ends of economizing of force curve 6 bonded assemblys of economizing in the force curve 4.The initial force curve of economizing is from shortest distance r1 〉=the best province force curve of chain drum central axis ultimate range r2 from the chain drum central axis, the shortest distance r3 of speedup curve decentering axis 〉=initially the economize ultimate range r4 of force curve from the chain drum central axis.When chain drum rotates best province force curve from chain drum central axis distance the most in short-term, the circumferential force that produce this moment is constantly maximum, and then be the speedup curve, this moment, this curve was away from the chain drum central axis, so circumferential velocity maximum, chain circumferential force and circumferential velocity are corresponding to be changed to some extent so above-mentioned curve around chain drum axis hole center fluctuations, makes, and makes bicycle or three-wheel vehicle etc. free and relaxed under steam.

Have standard pitch 12.7mm sprocket 9 on the periphery, profile of tooth is made by the GB1244-76 requirement.The number of teeth will be decided according to the landform purposes on the periphery.As the high-land loading climbing again of often travelling, can select 35 teeth or 37 teeth for use; Women, children or weakling can select 41 teeth or 43 teeth for use; Young healthy person and sportsman, 47 teeth or 49 teeth or 53 teeth can be adopted in often come in and go out little hills or Plain, can match in excellence or beauty with racing car.

The following specification of 41 teeth can be enclosed in the bicycle chain tray salver, and chain cover is not installed more than 43 teeth, replaces conventional chain cover with protected enclosure (as the racing car protective cover).The number of teeth can be divided into 13 Series Design manufacturings from 25～53 teeth, select for use for the user.Certainly also can select for use other number of teeth according to actual needs as below 25 teeth or more than 53 teeth.

The ratio (with reference to figure 2) of the long axis length l1 of chain drum and minor axis length l2:

l1：l2＝（1.20～1.35）：1。

With reference to figure 2, crank 10 is installed on chain drum the time, the major axis line of centers that should guarantee chain drum transfers 0～30 ° with respect to the angle α of foot-operated crank center line to by anticlockwise direction, gets α=30 ° in the present embodiment.

Claims

1, energy-saving speedup chain drive is characterized in that the pitch circle line of described chain drum is made up of two sections principal curves, have respectively in every section principal curve province's force curve, with economize force curve bonded assembly speedup curve.

2, energy-saving speedup chain drive as claimed in claim 1, it is characterized in that initial province force curve is arranged in the described province force curve, economize the best that force curve joins and economize force curve, initially economize force curve, the shortest distance r3 of speedup curve decentering axis 〉=initially the economize ultimate range r4 of force curve from the chain drum central axis from shortest distance r1 〉=the best province force curve of chain drum central axis ultimate range r2 from the chain drum central axis with initial.

3, energy-saving speedup chain drive as claimed in claim 2 is characterized in that also having in the described province force curve two ends to economize the linear portion of force curve and speedup contact of a curve respectively with the best.

4, energy-saving speedup chain drive as claimed in claim 1 is characterized in that the long axis length L1 of described chain drum and the ratio of minor axis length L2: L1:L2=(1.20～1.35): 1.

5, energy-saving speedup chain drive as claimed in claim 1 is characterized in that described major axis line of centers transfers 0～30 ° with respect to the angle α of foot-operated crank center line to by anticlockwise direction

6, energy-saving speedup chain drive as claimed in claim 5 is characterized in that described angle α=30 °.

7, energy-saving speedup chain drive as claimed in claim 1 is characterized in that the described chain drum periphery number of teeth is 25～53 teeth.