CN2343072Y

CN2343072Y - Speed variator for bicycle

Info

Publication number: CN2343072Y
Application number: CN 98242094
Authority: CN
Inventors: 吕建生
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-10-13
Filing date: 1998-10-13
Publication date: 1999-10-13
Anticipated expiration: 2008-10-13

Abstract

The utility model relates to a speed changer for a bicycle, which comprises gears, a drive shaft, a gear shaft, a chain wheel shaft and a chain wheel, wherein, the drive shaft (5), the gear shaft (6) and the chain wheel shaft (7) are mutually parallel, but are not in the same plane; a gear (1) is arranged on the drive shaft (5); a gear (2) and a gear (3) are arranged on the gear shaft (6); a gear (4) is arranged on the chain wheel shaft (7); the gear (1) is engaged with the gear (2); the gear (3) is engaged with the gear (4); the chain wheel is arranged at one end of the chain wheel shaft; the chain wheel is larger than the flywheel. The bicycle adopting the speed changer has high speed and labor saving.

Description

The bicycle change-speed box

The utility model relates to bicycle speed change parts.

Known bicycle mostly is a kind of speed, existing in recent years different types of bicycle change-speed box is developed and is used for the speed change of bicycle, as notification number be 2149347Y patent disclosure a kind of labour-saving change-speed box, the change-speed box of this bicycle is made up of foot-operated crank, sprocket wheel and flywheel, it also has 4 gears, sleeve, pays axle and housing, imput shaft and to pay axle parallel to each other, gear are contained in successively that axle is gone up and are meshing respectively, and the diameter of sprocket wheel and flywheel is approximately equal.Adopt the bicycle of this change-speed box more laborsaving, and speed is fast, but this vehicle speed is still fast inadequately than common car.

It is faster that the purpose of this utility model provides a kind of speed, more labour-saving bicycle change-speed box.

This bicycle change-speed box, comprise gear, imput shaft, gear wheel shaft, sprocket shaft and sprocket wheel, it is characterized in that: imput shaft, gear wheel shaft, sprocket shaft are parallel to each other, but not in same plane, gear (1) is contained on the imput shaft, and gear (2) and gear (3) are contained on the gear wheel shaft, gear (4) is contained on the sprocket shaft, and gear (1) is meshed with gear (2), and gear (3) is meshed with gear (4), and sprocket wheel is contained in an end of sprocket shaft.

It is transmission shaft with foot-operated main shaft that the utility model adopts said structure, and then the driven gear axle, and by three speed changes, has therefore improved the speed of bicycle greatly, moreover in the utility model, wheel disc is therefore also more laborsaving greater than flywheel diameter.

Be described further below in conjunction with drawings and Examples.

Fig. 1 is a variable-speed motion device structural representation;

Fig. 2 is the running condition reference diagram.

Embodiment 1: the imput shaft 5 in this variable-speed motion device, gear wheel shaft 6, sprocket shaft 7, be parallel to each other but not in same plane, the number of teeth is housed is 36 gear 1 on imput shaft 5, the number of teeth is housed is 32 the gear 2 and the number of teeth on the gear wheel shaft 6 and be 46 gear 3, and gear 1 is meshed with gear 2, the number of teeth is housed is 20 gear 4 on the sprocket shaft 7, gear 4 is meshed with gear 3, and all the modulus of gears is 2.5.Above-mentioned variable-speed motion device is fixed in the flute profile framework 9, the two ends of axle 5 and an end of sprocket shaft stretch out from the sidewall of flute profile framework 9, stretcher is contained in turning on the axle 12 of linking to each other with kinematic axis 5, imput shaft 5, gear wheel shaft 6, pair of bearings 8 all is housed on the sprocket shaft 7, and the end sprocket wheel 10 that sprocket wheel is contained in sprocket shaft outside the groove-shaped frame 9 links to each other with flywheel on being contained in the bicycle rear axle by chain, and sprocket wheel is greater than flywheel.Fig. 2 is used in the Last scheme drawing of bicycle when using for the utility model, the groove-shaped frame 9 that the variable-speed motion device is housed is fixed on the bottom of the preceding spider of bicycle.

Embodiment 2: in the present embodiment, each parts is identical with embodiment 1 with assembling form, but the number of teeth of gear 1 is 27, and the number of teeth of gear 2 is 30, and the number of teeth of gear 3 is 39, and the number of teeth of gear 4 is 17, and its modulus is 3.

The utility model is applicable to the bicycle of any kind of.

Claims

1. bicycle change-speed box, comprise gear, imput shaft, gear wheel shaft, sprocket shaft and sprocket wheel, it is characterized in that: imput shaft (5), gear wheel shaft (6), sprocket shaft (7) are parallel to each other, but not in same plane, gear (1) is contained on the imput shaft (5), and gear (2) and gear (3) are contained on the gear wheel shaft (6), gear (4) is contained on the sprocket shaft (7), and gear (1) is meshed with gear (2), and gear (3) is meshed with gear (4), and sprocket wheel is contained in an end of sprocket shaft.

2. bicycle change-speed box according to claim 1 is characterized in that: the module of gear in the variable-speed motion device is 2.5-3.0, and the number of teeth of gear (1), gear (2), gear (3), gear (4) is respectively 36,32,46,20.

3. bicycle change-speed box according to claim 1 and 2 is characterized in that: on dynamical axis (5), gear wheel shaft (6), the sprocket shaft (7) pair of bearings (8) is housed all.

4. bicycle change-speed box according to claim 3 is characterized in that: framework (9) is a grooved.