CN2052392U

CN2052392U - Crank variable device for the cycle and tricycle

Info

Publication number: CN2052392U
Application number: CN 89209469
Authority: CN
Inventors: 李洪义; 王玉英; 甘丽君
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-09-06
Filing date: 1989-09-06
Publication date: 1990-02-07

Abstract

The utility model relates to a crank variable device for cycles and tricycles. The crank variable device overcomes the defects of high cost and complicated structure in the prior art. The crank variable device not only comprises a main arm, an auxiliary arm and a one-way index mechanism, but also comprises a ratchet wheel, a clamping pin, springs, screws, nut and shims. The main arm and the auxiliary arm are both installed on the ratchet wheel. The auxiliary arm can rotate unidirectionally with 360 DEG around the ratchet wheel. With the changes of the centre distance of the main arm and the auxiliary arm, the surface ratio is changed to change the speed. The utility model has the advantages that speed is changed on base that an original bicycle structure is not changed; compared with a common bicycle, the driving force is increased by 30% to 50%; the structure is simple; the cost is low.

Description

Crank variable device for the cycle and tricycle

The utility model relates to a kind of mechanical type crank speed-changing mechanism.

The transmission system that was used for bicycle or three-wheel vehicle in the past mainly contains two kinds of forms.A kind of is to utilize this structure of gear change comparatively complicated, damages easily, and comparatively difficulty is installed.Another kind is to utilize the sprocket wheel speed change, and this structure is used on the bicycle racing more, and it exists complex structure equally, shortcomings such as manufacture difficulty is big, price height.

The purpose of this utility model is to overcome the deficiency of above-mentioned prior art, and a kind of bicycle or three-wheel vehicle crank speed-changing mechanism of being used for is provided.

Structure of the present utility model such as Fig. 1～shown in Figure 4, by principal arm, auxiliary and one-way dividing mechanism constitute, and include principal arm, auxiliary, ratchet, bayonet lock, spring, trimming screw, compositions such as pad.Its principal arm is connected with the axis of bicycle, and principal arm and auxiliary are installed on the ratchet.Ratchet is screwed on principal arm, and auxiliary can be around 360 ° of rotations of ratchet one-way.The number of teeth in the ratchet is identical with retaining number in the speed change.Bayonet lock and spring can be installed on the auxiliary, also can be installed on the principal arm.Bicycle pedal is connected with the auxiliary screw.

Principle of work of the present utility model is to utilize the variation of principal arm and auxiliary width between centers H to change differential surface speed and moment, thereby reaches the purpose of speed change.Because the effect of ratchet and bayonet lock, auxiliary can only rotate to calibration by folk prescription, so when speed change, reversing sense elder generation calibration rotates the wherein crank of a pin, the crank on reversing sense calibration rotation another pin reaches the purpose that changes width between centers afterwards.Can carry out calibration according to different needs during speed change rotates.

One-way dividing mechanism of the present utility model also can adopt the form of side tooth-like clutch to change the crank center distance.This structure as shown in Figure 5.It is to utilize the pressure of spring to come the unidirectional calibration of control clutch to rotate.Include principal arm, auxiliary, power-transfer clutch, spring, center shaft etc.

Description of drawings:

Fig. 1 is the structural representation of left side crank transmission system.

Fig. 2 is the birds-eye view of Fig. 1.

Fig. 3 is the structural representation of right side crank transmission system.

Fig. 4 is the birds-eye view of Fig. 3.

Fig. 5 is the structural representation of side tooth-like clutch crank transmission system.

Principal arm 1, auxiliary 2, ratchet 3, bayonet lock 4, spring 5, trimming screw 6, nut 7, screw 8, pad 9, bicycle middle shaft 10.

The relatively original technology of the utility model has the following advantages: realize speed change on the basis that does not change bicycle or tricycle original structure. Slewing range is big, and simple installation is simple in structure, and cost is low than gear type and chain-type speed change gear, and easy to manufacture. Comparing with ordinary bicycle, it is about 30% to improve driving force at sloping road going, can improve the speed of a motor vehicle about 50% on the smooth-riding surface.

Claims

1, a kind of crank transmission system that is used for bicycle or three-wheel vehicle, by principal arm 1, auxiliary 2 and one-way dividing mechanism three parts are formed, include principal arm 1, auxiliary 2, ratchet 3, bayonet lock 4, spring 5, trimming screw 6, nut 7, screw 8, pad 9, bicycle middle shaft 10, it is characterized in that: principal arm 1 links to each other with bicycle middle shaft 10, principal arm 1 and auxiliary 2 are installed on the ratchet 3, ratchet is fixed on the principal arm 1 with screw 8, auxiliary 2 can be around ratchet 3 unidirectional 360 ° of rotations, the number of teeth of ratchet 3 is identical with the retaining number of speed change, bayonet lock 4 and spring 5 can be installed on the auxiliary 2, also can be installed on the principal arm 1.

2, crank transmission system according to claim 1 is characterized in that its one-way dividing mechanism both can adopt ratchet structure, also can adopt side tooth-like clutch structure.