CN2573367Y - Toothed wheel transmission and speed increasing bicycle - Google Patents

Abstract

The utility model relates to a speed increasing bicycle. The utility model is provided with a gear driving device which can produce speed increasing effect. A driving wheel of the utility model is rotated through pedaling by a rider's feet. A driven wheel is combined with a chain disc. The chain disc and a flywheel are driven by a chain so that a gear can be accelerated and rotated. In addition, the driving mechanism of the utility model can be fully sealed.

Description

Gear transmission and speeding-up bike

The utility model relates to a kind of gear system, especially can produce the bicycle of speedup effect.

At present, transmission mechanism of bicycle is made up of chain drum, chain and flywheel, and the rotating speed of chain drum is consistent with bicyclist's pedal frequency, then need accelerate the pedal frequency as desiring speedup, easily causes shank fatigue.In addition, the seal degree of transmission device is subjected to the influence of chain drum axle and bicycle pedal handle binding site, enters rainwater, dust easily, has increased the maintenance difficulty, has shortened service life.

The purpose of this utility model just provides a kind of gear system, and it can not only produce the effect of speedup, and has overcome the poorly sealed shortcoming of present transmission mechanism of bicycle.

The purpose of this utility model is achieved in that a gear fixed shaft gear train transmission device, its gear by axle and bearings in box body hole and be sealed in the rigidity casing, the axle two ends of its driving wheel extend to outside the casing and combine with the bicycle pedal handle, follower shaft right-hand member (bicycle freewheel one side) extends to outside the casing and combines with chain drum, drives the chain drum rotation.

The transmitting ratio of this gear fixed shaft gear train: $i_{13}=\frac{W_1}{W_3}=\frac{Z_3}{Z_1}$

Wherein:

W ₁--the cireular frequency of-----driving wheel.

W ₃--the cireular frequency of-----flower wheel.

Z ₁--the number of teeth of-----driving wheel.

Z ₃--the number of teeth of-----flower wheel.Work as Z ₁＞Z ₃The time, i ₁₃＜1, W ₁＞W ₃, then be the speedup motion.

By chain gear, flywheel drives wheel revolutions between chain drum and the flywheel.

The employing such scheme because the gear fixed shaft gear train is the speedup motion, drives the rotation of chain drum speedup, then under bicyclist's pedal condition identical with present bicycle, has realized the rotation of wheel speedup, can reach the purpose of bicycle speedup.Because chain drum has been removed pedal from, the transmission device that itself and flywheel, chain are formed then can seal fully.In addition, the utility model can be transformed on present bicycle structure basis, and is simple.

Accompanying drawing drawing of the present utility model is described as follows:

Fig. 1 is a scheme drawing of the present utility model.

Fig. 2 is the constructional drawing of the fixed shaft gear train transmission device of gear transmission and speeding-up bike.

Among the figure: 1, imput shaft 2, idle pulley 3, flower wheel

4, chain drum 5, flywheel 6, chain 7, pedal

Be elaborated below in conjunction with figure:

In Fig. 1, constitute the utility model driving system jointly by driving wheel (1), idle pulley (2), flower wheel (3) gear fixed shaft gear train transmission device of forming and the transmission device of forming by chain drum (4), flywheel (5), chain (6).Bicycle pedal (7) combines with driving wheel (1), it is rotated by external force, cause the gear fixed shaft gear train to produce the speedup transmission, and rotate by the chain drum (4) that flower wheel (3) drives combination with it, chain drum (4) is transmitted in flywheel (5) by chain (6), and flywheel (5) drives the wheel of combination with it.

In Fig. 1, pedal (7) only combines with driving wheel (1) axle outer end, both sides, and the left inboard of chain drum (4) only combines with flower wheel (3) axle right-hand member, so gear fixed shaft gear train transmission device and chain drum transmission device can be hermetically sealed respectively.

In the embodiment shown in Figure 2, by driving wheel (1) and idle pulley (2) engagement, idle pulley (2) and flower wheel (3) engagement, each gear is supported in the box body hole by axle and bearing and is sealed in the rigidity casing.Use the rotation direction that idle pulley can change flower wheel (3), increased the axle base of driving wheel (1) simultaneously with flower wheel (3).Because the transmitting ratio i of this gear fixed shaft gear train ₁₃Equal flower wheel (3) tooth number Z ₃With driving wheel (1) tooth number Z ₁Ratio, so can be by formula $i_{13}=\frac{Z_3}{Z_1}$ Calculating is also selected suitable gear ratio value, thereby produces corresponding speedup transmission.

Claims (4)

1, a kind of bicycle, its driving system comprises gear system, it is characterized in that: flower wheel can be directly and incorporated in vehicle wheels, drives wheel revolutions, also can drive wheel revolutions by another driving device.

2, according to power 1 described bicycle, it is characterized in that: the flower wheel of gear system combines with chain drum, and in flywheel, flywheel drives wheel revolutions to chain drum by chain gear.

3, according to power 1 described bicycle, it is characterized in that: the number of teeth of the driving wheel of gear system, idle pulley and flower wheel can be all identical, also can distinguish identical or the difference difference, can produce constant speed or speedup, deceleration transmission thus.

4, according to power 1 described bicycle, it is characterized in that: gear system and another driving device that combines with it can be distinguished sealing separately, also all sealings simultaneously.