CN2167939Y

CN2167939Y - Front pedal driving device for bicycle

Info

Publication number: CN2167939Y
Application number: CN92236104U
Authority: CN
Inventors: 陈福德
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-09-29
Filing date: 1992-09-29
Publication date: 1994-06-08
Anticipated expiration: 2002-09-29

Abstract

The utility model relates to a front pedal type driving device for bicycles. The position of a drive sprocket is moved from the middle of a part between two pedal cranks to one end of one pedal crank. The pedal cranks and a drive shaft are connected by a ratchet mechanism, the left and the right pedal cranks are arranged forwards, and the two cranks are connected with each other by a left and a right tooth sheets and a conical gear. When a bicycle with the utility model is ridden, the angle of pedals can be selected optionally in the one hundred and eighty degrees of effective work according to different situations, and the bicycle can be driven to move forwards by the alternate downward stepping of both feet. The utility model has the advantages of favorable labor-saving effect, the stable recoil of the pedal cranks, simple structure and comfortable ride.

Description

Front pedal driving device for bicycle

The utility model relates to a kind of bicycle driving device.

In existing bicycle driving device, bicycle is stepped on handle and is made 360 deg garden garden Zhou Yundong.Because foot-operated power is downward all the time, in last 180 degree of effectively work done, can produce the extremely short loss district of lower dead point and power arm, it is very painstaking to step.According to the introduction of in 1989 1033258A number invention bulletin, existing people has proposed at the axle drive shaft two ends ratchet, pull back spring and power-transfer clutch to be installed and has improved.But the pull back spring of this device has antagonistic force to stepping on handle at any time, has increased very big resistance, also limited when riding the selection that scrunches angle and when sliding bipod be unfavorable for the stable and safety of vehicle to stepping on putting forth effort of handle.

The utility model promptly is design-calculated in order to overcome above-mentioned shortcoming.Produce the shortcoming at dead point when purpose is to overcome and steps on handle and make garden Zhou Yundong, overcome the increase resistance that pull back spring causes, restriction scrunching angle, and bipod shortcoming such as puted forth effort when restriction was slided.Provide a kind of can be according to road grade, load-carrying situation, the free at any time new bicycle actuating device that scrunches angle of foot's adaptedness.

The utility model moves to an end with the position of drive sprocket by two centres of stepping on handle, and two step on handle all installs forward.Respectively adorn semicircle type garden awl gear piece at its root, a garden finishing bevel gear cuter is assembled in the minor axis location with both end thread (BET) on axle sleeve, and makes itself and two semicircle type gardens bore the gear piece engagement.Stepping on handle and imput shaft connection place is ratchet device.Both ends of main drive shaft is square, and there is a square hole at the ratchet center and is placed in axle head and constitutes fastening connection, the ratchet overcoat and with it for one step on handle and be connected in the semicircle type garden awl gear piece of stepping on the handle can only be around the unidirectional rotation of axle.Step on handle and depress a certain angle when one, imput shaft promptly drives sprocket wheel and rotates forward; Simultaneously, half garden gear piece drives garden, center awl return gear and rotates, and drives another gear piece, makes another step on handle rising equal angular.As long as alternately step handle, can drive to advance.Step on and step on angle under the handle and can in 180 degree, select voluntarily.

Compared with prior art, the utlity model has the labor-saving effect, and can freely at any time scrunch angle, it is stable to step on the handle return, simple in structure, the comfortable advantage of riding.

Description of drawings of the present utility model is as follows: (Fig. 1 is the structural representation of this device)

1, imput shaft 2, left ratchet are stepped on handle 3, left gear piece

4, return garden finishing bevel gear cuter 5, right gear piece 6, right ratchet are stepped on handle

7, drive sprocket 8, axle sleeve 9, minor axis

Below in conjunction with accompanying drawing the utility model is further described:

As shown in the figure, the left and right sides of the present utility model gear piece 3,5 is screwed respectively at left and right sides ratchet and steps on the handle 2,6; Two ratchet center fixation are stepped on handle with two ratchets and are placed a little less than horizontal position on imput shaft, load onto return garden finishing bevel gear cuter 4 on axle sleeve.Minor axis 9 location with both end thread (BET) are assembled and are made it to mesh with left and right sides gear piece.Drive sprocket 7 is fixed in the outermost end of imput shaft.

Claims

A kind of front pedal-type bicycle driving device, it is characterized in that: drive sprocket 7 is stepped on outside the handle 2,6 two, be fixed in the outermost end of imput shaft 1, step on handle and connect with ratchet device with imput shaft, two step between the handle with the left and right sides gear piece 3,5 and the 4 engagement connections of return garden finishing bevel gear cuter of being fixed on the ratchet of the left and right sides.