CN2646030Y - Power transmission device for bicycle - Google Patents

Abstract

A power transmission device for bicycle comprises a central axis casing, a central axis, a crank, a pedal, wherein the two ends of the central casing are respectively fixed with a cam which is rearward raised, the crank comprises a main crank and an auxiliary crank, a baffle is arranged at the back side of the relative position of the main crank and the auxiliary crank, the auxiliary crank is connected with the baffle in relative rotation, a lever hole is arranged on the main crank, a lever axle is inserted in the lever hole, one end of the lever axle is connected with an end of a shift lever, and the other end of the shift lever corresponds to the cam and forms a relative sliding connection with the cam, a rocker is fixed on the lever axle, the auxiliary crank of the front side of the baffle is relative rotary connected with one end of a connecting rod, while the other end of the connecting rod is relative rotary connected with the end of the rocker, and a stop convex is arranged on a rod body at one end of the auxiliary crank.

Description

The bicycle power drive

Affiliated technical field

The utility model belongs to the vehicle, the power drive on especially a kind of bicycle.

Background technology

Common bicycle power drive comprising the axis sleeve pipe of vehicle frame bottom, be installed in axis on the axis sleeve pipe, be installed in a pair of crank on the axis, be installed in the stretcher on each crank body of rod; Bicycle scrunches with bipod and is connected in axis two ends, the travelling of footboard drives car by the crank power transmission, crank rotates and the zero-g arm biweekly occurs, at this moment how big no matter the cyclist use legpower, and crank all can not spread out of acting with legpower, and legpower does not work and has been wasted.This kind bicycle power drive scrunches effort.

Summary of the invention

The purpose of this utility model provides a kind of labour-saving bicycle power drive that scrunches.

The technical solution adopted in the utility model is in order to achieve the above object: a kind of bicycle power drive, comprising the axis sleeve pipe of vehicle frame bottom, be installed in axis on the axis sleeve pipe, be installed in a pair of crank on the axis, be installed in the stretcher on the crank body of rod respectively; Its characteristics are: axis sleeve pipe two ends are the protruding backward cam of captive joint one respectively; Each crank is comprising main crank, auxiliary crank, the rear side of main crank and auxiliary crank opposite position is equipped with baffle plate, main crank is captiveed joint with baffle plate, the relative rotary connection of auxiliary crank with baffle plate, on the body of rod of main crank, have lever hole perpendicular to the body of rod, lever is installed with lever shaft in the hole, the relative rotary connection of lever shaft with the lever hole, lever shaft points to an end of an end captive joint driving lever of cam, but the other end of driving lever is corresponding with cam and become slide relative to connect with it, goes back captive joint one rocking bar on the lever shaft; An end of rotary connection one connecting rod relatively on the auxiliary crank of the front side of baffle plate, the connecting rod other end and the relative rotary connection of rocking bar one end; Have and the corresponding stop bit projection of main crank one end on the end body of rod of the auxiliary crank of main crank relatively.

The left and right sides crank that structure is identical is positioned on the axis of bicycle accordingly, turn to the below during plumbness when the crank of a side is stressed, an end of driving lever is pressed in the following recessed position of cam slideway on its main crank body of rod, driving lever is to rocking bar and the connecting rod application of force not, the auxiliary crank by gravity sagging naturally and with main crank on a vertical line; In the rotation process that makes progress under the drive of crank at axis, one end of the driving lever on the main crank body of rod is pressed in the raised position of cam slideway, at this moment the driving lever rotating band shakes the bar rotation, rocking bar rotates and drives link work, connecting rod pulling auxiliary crank rotates, thereby drive stretcher and walk around the zero-g arm, it is laborsaving that the people is scrunched, driving lever one end is pressed in the following recessed position of cam slideway when crank rotates, at this moment, stop bit projection on the auxiliary crank is pressed in an end of main crank, prevents that the relative baffle plate of auxiliary crank is rotated further, and legpower can all be passed to sprocket wheel and drive to advance; Left and right sides crank is alternately stressed like this, and lifting can be walked around the last lower dead point of zero-g arm, has eliminated the wasting phenomenon of legpower, has improved mechanical efficiency, makes people's treadmill laborsaving.

Description of drawings

Fig. 1 is a kind of structural representation of the present utility model;

Fig. 2 is driving lever among Fig. 1, rocking bar, connecting rod binding structure scheme drawing;

Fig. 3 is the solid of the another kind of embodiment of baffle plate among Fig. 1.

The specific embodiment

A kind of bicycle power drive, as shown in Figure 1, comprising the axis sleeve pipe of common vehicle frame bottom, be installed in axis 1 on the axis sleeve pipe, be installed in a pair of crank on the axis, be installed in the stretcher on the crank body of rod respectively; Axis sleeve pipe two ends are the protruding backward cam 2 of captive joint one respectively; Each crank is comprising main crank 4, auxiliary crank 6, the rear side of main crank and auxiliary crank opposite position is equipped with baffle plate 5, main crank is captiveed joint with common method with baffle plate, auxiliary crank is common relative rotary connection with baffle plate, on the body of rod of main crank, have lever hole perpendicular to the body of rod, be installed with lever shaft 10 in the lever hole, lever shaft is common relative rotary connection with the lever hole, as shown in Figure 2, lever shaft points to the end of an end of cam 2 with the common driving lever 3 of common method captive joint, but the other end of driving lever and cam 2 are corresponding and become common slide relative to connect with it, also use common method captive joint one rocking bar 9 on the lever shaft, rocking bar and driving lever also can be in the same sides, and rocking bar and driving lever also can be an integral body; With an end of the relative rotary connection one common connecting rod 8 of common method, the connecting rod other end and rocking bar 9 one ends are with the relative rotary connection of common method on the auxiliary crank 6 of the front side of baffle plate 5; Have and the corresponding common stop bit projection 7 of main crank one end on the end body of rod of the auxiliary crank of main crank relatively; In the present embodiment, baffle plate 5 is the clamping plate shape cover 11 of a fixed cover at main crank 4 upper ends as shown in Figure 3, and the direction of overlapping 11 subtend connecting rods has opening.

Claims (3)

1, a kind of bicycle power drive is comprising the axis sleeve pipe of vehicle frame bottom, be installed in axis (1) on the axis sleeve pipe, be installed in a pair of crank on the axis, be installed in the stretcher on the crank body of rod respectively; It is characterized in that: axis sleeve pipe two ends are the protruding backward cam (2) of captive joint one respectively; Each crank is comprising main crank (4), auxiliary crank (6), the rear side of main crank (4) and auxiliary crank (6) opposite position is equipped with baffle plate (5), main crank is captiveed joint with baffle plate, the relative rotary connection of auxiliary crank with baffle plate, on the body of rod of main crank, have lever hole perpendicular to the body of rod, be installed with lever shaft (10) in the lever hole, the relative rotary connection of lever shaft with the lever hole, lever shaft points to an end of an end captive joint driving lever (3) of cam (2), but the other end of driving lever is corresponding with cam and become slide relative to connect with it, goes back captive joint one rocking bar (9) on the lever shaft; An end of rotary connection one connecting rod (8) relatively on the auxiliary crank of the front side of baffle plate, the connecting rod other end and the relative rotary connection of rocking bar one end; Have and the corresponding stop bit projection of main crank one end (7) on the end body of rod of the auxiliary crank (6) of main crank relatively.

2, as claim 1 described bicycle power drive, it is characterized in that: described baffle plate (5) is the clamping plate shape cover (11) of a fixed cover at described main crank (4) upper end, and the direction of the cover described connecting rod of subtend (8) has opening.

3, as claim 1 described bicycle power drive, it is characterized in that: described rocking bar (9) is an integral body with driving lever (3).

Images