CN2250903Y - Labour-saver for bicycle - Google Patents

Abstract

The utility model relates to a labor-saving device for a bicycle. The traditional driving mode of crank circular motion of a bicycle is changed by using a mechanics level principle and a wheel shaft principle. The labor-saving device for a bicycle is mainly characterized in that a T-shaped connecting plate is tightly fixed on the right edge of a flywheel shaft. A concave shape of the T-shaped end of the T-shaped connecting plate is just clamped on a flat fork of a bicycle, and a chain wheel is installed on the T-shaped connecting plate. A connecting rod is arranged on the chain wheel. The connecting rod is connected with levers. Pedals are arranged on the left lever and the right lever. The left pedal and the right pedal are connected by a steel wire rope to up and down pedal to drive the chain wheel to rotate, and a flywheel and a rear wheel of the bicycle are driven by a chain to forwards move. Therefore, the labor-saving device for a bicycle has the advantages of simple structure, convenient maintenance, multiple labor saving, etc. The labor-saving device for a bicycle can be modified and used on the existing bicycle and is an ideal labor-saving device for a bicycle.

Description

Bicycle power-saving devices

The utility model relates to a kind of bicycle drive, particularly relates to a kind of bicycle power-saving devices.

China is a bikedom, and bicycle is the vehicle of a kind of indispensability of people.Existing bicycle is because power arm is short, and promptly bicycle crank is short, steps pedal by bike and drives crank and make garden Zhou Yundong, ride for a long time or when upward slope and loading the people just feel more painstaking.Though there are many people that transmission mechanism of bicycle has been done improvement, such as hydrostatic drive bicycle, fast bicycle, even chain-less bicycle etc., all undesirable because of effect, not laborsaving, complex structure or speed are slow or the like fails extensively to promote the use of.Patent Office of the People's Republic of China just disclosed " labour-saving bicycle " that a kind of number of patent application is 89214291X.This bicycle has used the lever force-saving device on drive mechanism, but this bicycle structure complexity, riding speed is also not really desirable, and maintenance is inconvenient, is difficult to apply.

The purpose of this utility model will provide exactly that a kind of structure is extremely simple, maintenance is easy to use, practicality is extremely strong, can easily improve the laborsaving bicycle power-saving devices that reaches several times of installation on existing bicycle.

Technical solution of the present utility model is such: the crank garden revolution mode that changes former bicycle transmission, utilizing on the existing bicycle basis, fastening tee T connecting panel on the right of flywheel shaft, the T-shaped end spill opening of connecting panel just in time is stuck on the chain stays, the other end extends back so that sprocket wheel to be installed, movable rod is installed on sprocket wheel, connecting rod be welded in the right upright lever rear end of sticking fulcrum of bicycle and become flexible connection through being contained in, the front end of lever is equipped with right pedal, the rear end of lever left then is contained on the fulcrum that is welded in the upright fork in a bicycle left side, its front end then is equipped with left foot and pedals, a left side, right pedal and lever thereof are with by being welded on that fixed pulley on the fixed pulley seat on two braces of bicycle tripod tightens up with fastener and adjustable steel rope connects and makes it interlock, sprocket wheel (2) rotates by chain (3) and drives flywheel (4) motion, and mudwing is fixed on the axis fulcrum of fixed pulley seat and bicycle tripod.

The utility model is described in further detail below in conjunction with the drawings and specific embodiments:

Fig. 1 is an assembling scheme drawing of the present utility model;

Fig. 2 is that A-A of the present utility model is to cross-sectional schematic;

Fig. 3 is that B-B of the present utility model is to cross-sectional schematic.

In Fig. 1 assembling scheme drawing of the present utility model, bicycle power-saving devices is reequiped on existing bicycle basis, sprocket wheel 2 still uses existing 48 gear wheels, do not need axis, crank, chain guard etc., when right pedal 12 is down stepped on, lever 1 drivening rod 5 up moves, and then drives sprocket wheel 2 works half garden Zhou Yundong, and steel rope 10 makes left foot pedal 12 together with carrying on the lever left 8 through pulleys 9 simultaneously; Pedaling 12 when left foot again mentions right pedal 12 by steel rope 10 through fixed pulley 9 when down stepping on and rises, lever 1 will be down with the end that connecting rod 5 joins, 5 on connecting rod can be made half garden Zhou Yundong in addition by drive sprocket 2, sprocket wheel 2 rotates by chain 3 and drives flywheel 4 and bicycle rear motion, and motion just drives bicycle fast forward and so forth.

The utility model bicycle power-saving devices can also be retrofitted on the three-wheel vehicle and use, and this equally also is the scope of the utility model protection.

The utility model bicycle power-saving devices has changed traditional crank garden revolution type of drive, adopts the upper and lower radian of left and right lever to step, and drive sprocket and flywheel are made garden Zhou Yundong.According to mechanistic lever principle and wheel shaft principle:

The actual effective power arm of bicycle labor saving multiple=drive part ÷ bicycle crank effective power arm

And the actual effective power arm=lever moving arm of embodiment drive part-resistance arm-(half of 48 tooth sprocket wheel pitch diameters-centre of sprocket is to pin shaft hole centre distance)=640-220-(97.30-63)=375.7 (mm)

Half of crank effective power arm=crank two hole centre distance-48 tooth sprocket wheel pitch diameters=175-97.3=77.7 (mm)

(existing bicycle chainwheel is 48 teeth)

Promptly drawing the laborsaving multiple of present embodiment is 375.7 ÷ 77.7=4.83 times

By from the conclusion that calculates as can be known the utility model bicycle power-saving devices have following characteristics:

(1) compares laborsaving nearly five times with the existing bicycle that uses;

(2) simple in structure, reasonable in design, on existing bicycle basis, can reequip use, keep in repair easy to use.

(3) adopt the small flywheel large speed ratio, ride easily, fast, save time, laborsaving, be a kind of desirable bicycle power-saving devices.

Bicycle is installed this work-saving device will produce great social benefit and economic benefit.

Claims (1)

1, a kind of bicycle power-saving devices, comprise sprocket wheel (2), chain (3), flywheel (4) etc., it is characterized in that a fastening tee T connecting panel (6) on the right of flywheel (4) axle, connecting panel (6) T-shaped end spill opening just in time is stuck on the chain stays, the other end extends back for sprocket wheel (2) is installed along chain stay, mobilizable connecting rod (5) is housed on the sprocket wheel (2), connecting rod (5) be welded in the right upright fork of bicycle (15) and go up lever (1) rear end of fulcrum (7) and become flexible connection through being contained in, the front end of lever (1) is equipped with right pedal (12), the rear end of lever left (8) then is installed on the fulcrum (7) that is welded in the bicycle upright fork in a left side (15), its front end then is equipped with left foot pedals (12), a left side, right pedal (12) and lever thereof connect with the steel rope (10) that tightens up with fastener (14) by the fixed pulley (13) that is welded on the fixed pulley seat (9) on two braces of bicycle tripod makes it interlock, sprocket wheel (2) rotates by chain (3) and drives flywheel (4) motion, and fender (11) is fixed on the axis fulcrum of fixed pulley seat (9) and bicycle tripod.

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