CN2344281Y

CN2344281Y - Automatic chain-shifting device of rear wheel of speed variable bicycle

Info

Publication number: CN2344281Y
Application number: CN 98227048
Authority: CN
Inventors: 沈海成; 胡卫芹; 祝峰来
Original assignee: HUAIYIN BICYCLE CHAIN WHEEL FACTORY
Current assignee: HUAIYIN BICYCLE CHAIN WHEEL FACTORY
Priority date: 1998-06-10
Filing date: 1998-06-10
Publication date: 1999-10-20
Anticipated expiration: 2008-06-10

Abstract

The utility model relates to an automatic chain-shifting device of a rear wheel for speed variable bicycles; a group of equidistant centrifugal blocks are arranged on spoke ribs of the rear wheel; the connection rods of the centrifugal blocks are connected with a draw rod; the draw rod is contacted with a push rod in a push rod sleeve; the push rod is connected with a speed variable push ring; the centrifugal blocks move outward under the centrifugal action in riding and drive the draw rod to push outward the push rod; the push ring is forced to act on a chain which transits from a gear with multiple teeth to a gear with less teeth, and the speed is changed. The structure changes the traditional speed variable bicycle with a complex speed variable mechanism; increases reliability in riding, and enhances comfortable performance; thus, the utility model is an ideal replacement product for the existing speed variable bicycle.

Description

The variable speed bicycle trailing wheel is dialled the chain device automatically

The utility model relates to the vehicle, and particularly a kind of trailing wheel that is used for variable speed bicycle is dialled chain structure automatically.

Sell in the market and variable speed bicycle that people are using, preferably resolve bicycle and need the problem of speed change, particularly under high-land uphill/downhill or contrary wind situation, bring convenience to the bicyclist, but this derailleur has complicated speed-changing mechanism, speed change trouble not only when riding, and easily go wrong.

The purpose of this utility model is: design and a kind ofly can overcome existing derailleur speed-changing mechanism complexity with the bicycle that riding speed changes automatic change speed, the speed change difficulty is difficult for the defective of repairing.

The purpose of this utility model is achieved in that one group of centrifugal derby of design, equiangularly arranged on the trailing wheel spoke, centrifugal connects centrifugal bar, centrifugal bar is connected with pull bar, and the pull bar fulcrum is connected on the top stem casing, and pull bar operation point movable top is on tip-lever support, the push rod other end connects speed change and pushes away circle, push away circle and contact,, be with nest in the end of top stem casing for guaranteeing that top stem casing does not produce displacement with chain.

When riding, under the drive of middle shaft gear, trailing wheel rotates, along with centrifugal on the raising trailing wheel spoke of rotating speed outwards motion, drive centrifugal bar and move outside wheel, pull bar is lifted, the other end of pull bar moves in top stem casing, making push rod drive speed change push away circle outwards moves along rear axle, promote chain transition on the low flywheel teeth of the number of teeth on the many flywheel teeth of the number of teeth, it is fast more to ride, and the position of moving is big more, the ratio of number of teeth of middle shaft gear and trailing wheel flywheel teeth is big more, Vehicle Speed is fast more, and when slowing down or stop to pedal axis, the metal centrifugal blocks centnifugal force on the trailing wheel reduces, push away under the action of the spring of circle in top stem casing, move to the inside, chain is under the promotion of outside spring push-rod, by few multiple tooth flywheel transition of teeth directional simultaneously, speed slows down, and realizes just can making the infinite variable speed purpose of bicycle without deflector rod device.

Provide accompanying drawing below

Fig. 1 is the utility model appearance structure scheme drawing

Fig. 2 is the utility model top stem casing structural representation

Among the figure: 1 centrifugal, 2 centrifugal bars, 3 pull bars, 4 pull bar operation points, 5 top stem casings, 6 tip-lever supports, 7 springs, 8 push away circle, 9 top stem casing bearings, 10 locatings plate

Introduce the utility model embodiment below in conjunction with accompanying drawing:

Flexibly connect centrifugal bar 2 for centrifugal 1, centrifugal bar 2 flexibly connects pull bar 3, the other end of pull bar 3 is pull bar operation point 4, contact with the tip-lever support 6 in the top stem casing 5, spring 7 is arranged in top stem casing 5, and push rod 6 other ends are fixed on and push away on the circle 8, and one group of top stem casing 5 equidistantly distributes respectively on top stem casing bearing 9, for making top stem casing 5 not produce displacement and increasing the reliability that moves, install locating plate 10 additional at the opposite side that pushes away circle 8.

When bicycle advances, the rotation of trailing wheel drives centrifugal 1 and outwards moves, wheel is fast more, the trend of moving outward is big more, when outside wheel rim, moving for centrifugal 1, drive centrifugal bar 2 displacements, centrifugal bar 2 pulling pull bars 3, make the operation point 4 of pull bar 3 other ends promote tip-lever support 6 displacements, make to push away circle 8, after the speed of a motor vehicle reduces away from top stem casing bearing 9, centrifugal is moved power outward and reduces, because the push rod operation point loses thrust, under the effect of spring 7, it is close to top stem casing bearing 9 gradually again to push away circle 8, owing to push away the effect that the displacement of circle 8 is subjected to chain outside spring push-rod simultaneously, can make chain from the many flywheel of the number of teeth to the few flywheel transition of the number of teeth, or few to the many flywheel transition of tooth from tooth, realize stepless change.

Centrifugal 1 is heavy metal material, and to guarantee having enough centnifugal forces, top stem casing bearing to be contained in chain one side and trailing wheel is synchronized with the movement, locating plate 10 is positioned at the opposite side of hind axle, and activity is inserted on the top stem casing.

The utility model is simple in structure, and speed changing effect is good, has cancelled the transmission system of present derailleur complexity, and fault is few, and is stable, is the existing desirable regeneration product of old-fashioned derailleur of realizing speed change by driving lever.

Claims

1, a kind of variable speed bicycle trailing wheel is dialled the chain device automatically, it is characterized in that: one group centrifugal (1) is equiangularly arranged on the trailing wheel spoke, go up connection centrifugal bar (2) centrifugal (1), centrifugal bar (2) is connected with pull bar (3), tip-lever support (6) in pull bar (3) other end operation point (4) and the top stem casing (5) contact, and the other end connection speed change of tip-lever support (6) pushes away circle (8).

2, a kind of variable speed bicycle trailing wheel according to claim 1 is dialled the chain device automatically, it is characterized in that: push away the push rod on the circle (8), be inserted in push rod bearing (9) bonded assembly top stem casing (5) in.

3, a kind of variable speed bicycle trailing wheel according to claim 1 is dialled the chain device automatically, it is characterized in that: be with spring (7) on the tip-lever support (6) in the top stem casing (5).

4, a kind of variable speed bicycle trailing wheel according to claim 1 is dialled the chain device automatically, it is characterized in that: be with locating plate (10) in one group of top stem casing (5) end.