CN2361554Y

CN2361554Y - Double-chain automatic speed-changing device for non-automotive vehicle

Info

Publication number: CN2361554Y
Application number: CN 99205434
Authority: CN
Inventors: 秦利
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-03-17
Filing date: 1999-03-17
Publication date: 2000-02-02
Anticipated expiration: 2009-03-17

Abstract

The utility model provides a double-chain automatic speed-changing device for a non-automotive vehicle. The utility model is characterized in that the utility model is composed of a high-speed chain driving mechanism and a low-speed chain driving mechanism. When a resistance is large, the low-speed chain driving mechanism works; when the resistance is small, the high-speed chain driving mechanism is automatically in working state, and the low-speed chain driving mechanism does not work. Under the condition of a definite input force, the non-automotive vehicle can keep fastest speed. Compared with the existing speed-changing devices, the utility model has the advantages of simple structure, speed-changing line, chain and chain wheel saving, etc. The utility model is suitable for the non-automotive vehicles, especially bicycles.

Description

The double-stranded automatic shift device of unpowered vehicle

The utility model belongs to the double-stranded automatic shift device of a kind of unpowered vehicle.

The transmission principle of variable speed bicycle is at present: the chain wheel driving mechanism by a chain is formed by changing the ratio of number of teeth of driving and driven sprocket wheel, reaches the purpose of speed change.Promptly when resistance big (such as going up a slope or against the wind), gear-change hand lever is transferred to the little driving and driven sprocket wheel of number of teeth ratio with chain and is got on; When resistance little (such as descending or with the wind), gear-change hand lever is transferred to the big driving and driven sprocket wheel of number of teeth ratio with chain and is got on.Its shortcoming is: speed change needs manually, and is cumbersome; The speed-changing mechanism more complicated; When converter speed ratio was frequent, shift cable was easily broken, can't realize speed change; Wearing and tearing to chain and sprocket wheel are bigger.

The purpose of this utility model is to provide a kind of double-stranded automatic shift device of unpowered vehicle of avoiding above-mentioned deficiency.

The purpose of this utility model is achieved in that it is made up of driving and driven sprocket wheel and chain, it is characterized in that:

1, driven sprocket is made up of two not of uniform size and coaxial sprocket wheels, and minor sprocket is a flywheel with respect to axletree, and the relative minor sprocket of hinge wheel is a flywheel, forms the differential type flywheel;

2, drive sprocket is made up of two not of uniform size and coaxial sprocket wheels, initiatively hinge wheel and driven minor sprocket (because of its ratio of number of teeth big) the composition high speed drive, remaining (because of its ratio of number of teeth little) be low speed driving mechanism, initiatively minor sprocket and ratchet, bearing inner sleeve and axis are connected as a single entity, initiatively hinge wheel and bearing outside are one, one end of press rods is fixed on the hinge wheel, the other end of press rods is connected with extension spring, the other end of extension spring is fixed on the hinge wheel, press rods is pressed on the ratchet under the effect of extension spring.

Of the present utility modelly dynamically be: during the unpowered vehicle ground zero, the axis rotation drives bearing inner sleeve, ratchet successively, initiatively minor sprocket rotation, low speed driving mechanism work.Owing to be ground zero, external drag is very big, and during greater than the pulling force of extension spring, press rods breaks away from ratchet, and therefore initiatively hinge wheel is not worked (but still rotation), but will be with driven hinge wheel rotation because of driven minor sprocket, and promptly high speed drive is rotated and do not worked; At this moment, the ratio of number of teeth of low speed mechanism is little, and is therefore laborsaving; When running into the wind or during descending, external drag is very little, during less than the pulling force of extension spring, press rods is pressed on the ratchet, and two driving wheels rotate synchronously, and two transmission devices are worked simultaneously.When the rotating speed of rear axle surpassed the rotating speed of driven hinge wheel, driven hinge wheel skidded, and this moment, low speed driving mechanism was not worked (but still rotation), and the ratio of number of teeth of high speed drive is big, and at this moment high speed drive works alone.

The utility model is compared with existing transmission system, its outstanding characteristics are: it can be according to the difference of external circumstances, automatically conversion high gear or low gear, it is more comfortable that the people is ridden, simultaneously it also have simple in structure, save shift cable and advantages such as chain, sprocket wheel.

Further specify the utility model below in conjunction with accompanying drawing.

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

Fig. 2 is the cutaway view (omit chain) of Fig. 1 along the A-A line.

Referring to Fig. 1, the left side is a flower wheel, and the right side is a driving wheel.The utility model is installed on the bicycle.

Driven sprocket is made up of inboard sprocket wheel 1 and outside sprocket wheel 2, wherein inboard sprocket wheel is 28 teeth, outside sprocket wheel is 16 teeth, the outside (little) sprocket wheel is flywheels with respect to car rear axle 3, inboard (greatly) sprocket wheel is a flywheel with respect to the outside (little) sprocket wheel, and they form differential type flywheel (referring to Fig. 2).

Drive sprocket is made up of inboard sprocket wheel 5 and outside sprocket wheel 6, wherein inboard sprocket wheel is 36 teeth, outside sprocket wheel is 48 teeth, a chain drive is respectively formed in the inboard and outside, the ratio of number of teeth of inboard transmission device is 36: 28=1.28: 1, and the ratio of number of teeth of outer final drive gear is 48: 16=3: 1.Because the ratio of number of teeth of the transmission device in the outside is big, therefore the transmission device in the outside high speed drive, speed driving mechanism is hanged down in then crying of inboard.Inboard (little) sprocket wheel 5 and ratchet 7, the interior cover and the axis 8 of bearing 9 are connected as a single entity.The outside (greatly) sprocket wheel 6 is connected as a single entity with the overcoat of bearing 9.One end of press rods 4 is fixed on the sprocket wheel 6 of the outside, and the other end is connected with extension spring 10, and the other end of extension spring is fixed on the sprocket wheel 6 of the outside, and press rods is pressed on the ratchet under the effect of extension spring.

Of the present utility modelly dynamically be: during the bicycle ground zero, the axis rotation drives bearing inner sleeve, ratchet, initiatively minor sprocket rotation, low speed driving mechanism work successively.Owing to be ground zero, external drag is very big, and during greater than the pulling force of extension spring, press rods breaks away from ratchet, and therefore initiatively hinge wheel is not worked (but still rotation), but will be with driven hinge wheel rotation because of driven minor sprocket, and promptly high speed drive is rotated and do not worked; At this moment, the ratio of number of teeth of low speed mechanism is little, and is therefore laborsaving: when running into the wind or during descending, the external drag limit is little, during less than the pulling force of extension spring, press rods is pressed on the ratchet, and two driving wheels rotate synchronously, and two transmission devices are worked simultaneously.When the rotating speed of rear axle surpassed the rotating speed of driven hinge wheel, driven hinge wheel skidded, and this moment, low speed driving mechanism was not worked (but still rotation), and the ratio of number of teeth of high speed drive is big, and at this moment high speed drive works alone.

Claims

1, the double-stranded automatic shift device of a kind of unpowered vehicle, it is made up of driving and driven sprocket wheel and chain, it is characterized in that:

(1), driven sprocket is made up of two not of uniform size and coaxial sprocket wheels, minor sprocket is a flywheel with respect to axletree, the relative minor sprocket of hinge wheel is a flywheel, forms the differential type flywheel;

(2), drive sprocket is made up of two not of uniform size and coaxial sprocket wheels, initiatively hinge wheel and driven minor sprocket are formed high speed drive, remaining is low speed driving mechanism, initiatively minor sprocket and ratchet, bearing inner sleeve and axis are connected as a single entity, and initiatively hinge wheel and bearing outside are one, and an end of press rods is fixed on the hinge wheel, the other end of press rods is connected with extension spring, the other end of extension spring is fixed on the hinge wheel, and press rods is pressed on the ratchet under the effect of extension spring.

2, the double-stranded automatic shift device of unpowered vehicle according to claim 1, it is characterized in that: described high speed drive is in the outside, and its ratio of number of teeth is 3: 1, and low speed driving mechanism is in the inboard, and its ratio of number of teeth is 1.28: 1.