CN2092486U

CN2092486U - Force-saving device for padicab

Info

Publication number: CN2092486U
Application number: CN91215068U
Authority: CN
Inventors: 叶民康
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-01-23
Filing date: 1991-01-23
Publication date: 1992-01-08

Abstract

The utility model relates to a force saving device for a manpower bicycle. A cam is arranged on a pedal rod; the cam is butted with an energy accumulator fixed on a bicycle frame; the energy accumulator comprises a roller, a rocker and a tension spring; the roller on the end of the rocker is contacted with the cam by the tension spring. When a pedal is positioned in a phase angle interval which is favorable to force application, the radius of the cam is enlarged so as to store energy; when the pedal is positioned in a phase angle which is not favorable to force application, the radius of the cam is reduced so as to release the energy; therefore, the force saving for riding is obtained. The utility model is suitable for various manpower bicycles and especially suitable for bicycles.

Description

Force-saving device for padicab

The utility model relates to the labour saver that a kind of bicycle and trishaw are used.

In the prior art, bicycle and trishaw are to drive circular chain-wheel by step to drive.When circular movement is made in its step, near the moment it is in perpendicular line, when promptly people's pin is in the highest or extreme lower position, be difficult to firmly, this moment, main inertia by car moved ahead.Have only when step surmounts perpendicular line and leans forward certain angle, people's pin is firmly effective.The circular configuration that is limited to former hinge wheel just is difficult to make full use of best step phase angle, to reach laborsaving.

The purpose of this utility model can make full use of the most favourable step phase angle and reaches driving labour-saving manpower bicycle's labour saver providing a kind of.

In order to achieve the above object, the utility model adopts following technical proposals:

This labour saver characteristics are to connect a cam on a pedal stroke of sprocket wheel, cam props up the accumulator that includes rocking bar 4, roller 5, extension spring 3 that is fixed on the vehicle frame against, the roller 5 that is contained in rocking bar 4 one ends contacts with cam 8 all the time, during installation, step is in the α interval, assembling angle that the most favourable pin is exerted oneself, at this moment, the contact of roller 5 is in the ellipse short shaft place, step not only makes sprocket rotation, and accumulator is rotated, and makes the accumulator energy storage; When step is in the interval, phase angle that unfavorable pin is exerted oneself, the profile of cam is in the radius section of reducing, even this moment, people's pin was not exerted oneself since accumulator discharge can, provide propulsive effort to car.Like this, just can make full use of best step phase angle, reach laborsaving purpose.

The cam of this labour saver can be an ellipse figure, and the ratio that its oval section can be designed to ellipse short shaft and transverse is that 1:1.4～1:1.8 is advisable.

When cam was captiveed joint with pedal stroke, accumulator and cam was in the ellipse short shaft of cam by some when their relative position can be designed so that step surmounts perpendicular line α and is 30 °～50 ° angles.This angle is the most favourable firmly initial point in interval, phase angle of step just.The most favourable firmly interval, phase angle reaches between 90 ° of phase regions approximately, and the camb contour radius was in and increased the district this moment, promptly during the energy storage of accumulator.

The accumulator of this labour saver can adopt multiple version, constitutes atmospheric pressure accumulator, fluid pressure type, spring accumulator etc. as piston and cylinder.Fairly simple energy-storage travelling wave tube is an extension spring of being fixed on the vehicle frame, makes terminal of extension spring lean on cam.This accumulator is by the pulling force of extension spring and energy storage discharges energy during the extension spring resilience.In order to improve a service condition of propping up by point, can adorn its available bearing contact cam of a roller at the end of pole, the formation rolling is propped up and is leaned on, and reduces a frictionally and props up by wearing and tearing.

The utility model has conspicuous advantage compared with prior art: as long as load onto a cam on pedal stroke, and extension spring of peace bears against cam on vehicle frame, simple in structure being easy to make to be installed, but can make full use of the most favourable firmly phase angle of step, reach people's pin firmly effectively, it is laborsaving to drive a vehicle.

The drawing of accompanying drawing is described as follows:

Fig. 1 is the structural representation of an embodiment of the utility model.

Fig. 2 is birds-eye view of the present utility model (vehicle frame omission).

Label among the figure is the 1-accumulator, the little axle of 2-, 3-extension spring, 4-rocking bar, 5-roller, 6-pedal stroke, 7-sprocket wheel, 8-cam.

A best enforcement of the present utility model is: referring to Fig. 1, at cam 8 of a pedal stroke captive joint of sprocket wheel 7,8 on cam leans on an accumulator 1 that is fixed on the vehicle frame.Rocking bar 4 middle parts on the accumulator are by being equipped with and rocking bar 4 moving little axles 2 of joining, little axle 2 is fixed on the vehicle frame, be fixed on the vehicle frame equally with rocking bar 4 one end bonded assembly extension springs 3, a roller 5 is loaded onto in rocking bar 4 upper ends, and its available antifriction-bearing box contacts with cam 8, and the contour shape of cam 8 is oval or the projection of other band symmetrical curves, its minor axis, with the ratio of major axis be 1:1.6, outside extension spring, can overlap 1 sleeve, referring to Fig. 1, Fig. 2.When cam 8 was connected with pedal stroke 6, when pedal stroke 6 surmounted perpendicular line assembling angle α and is 45 °, accumulator 1 was in the ellipse short shaft place with the contact point of cam 8.

The utility model is applicable to various manpower bicycles, is particularly useful for bicycle.

Claims

1, a kind of labour saver that is used for bicycle and trishaw, it is characterized in that cam 8 of captive joint on the pedal stroke 6 of sprocket wheel 7,8 on cam is against an accumulator 1 that includes 4 extension springs 3 of roller 5 rocking bars that is fixed on the vehicle frame, and the roller 5 that is contained in rocking bar 4 one ends contacts with cam 8 all the time.

2, labour saver according to claim 1 is characterized in that the contour shape of accumulator 1 cam 8 is ellipse figures.

3, labour saver according to claim 2, the ratio that it is characterized in that cam 8 ellipse short shafts and transverse is 1:1.4～1:1.8.

4, labour saver according to claim 3, the contact point of roller 5 was in the ellipse short shaft place when assembling angle α that it is characterized in that cam 8 relative pedal strokes 6 was 30 °～50 °.

5, labour saver according to claim 1, rocking bar 4 middle parts that it is characterized in that accumulator 1 are by being equipped with and the little axle 2 of rocking bar 4 running-fits, and little axle 2 is fixed on the vehicle frame, is fixed on the vehicle frame equally with rocking bar 4 lower end bonded assembly extension springs 3.