Bicycle without chain

Abstract

The invention discloses a bicycle without a chain. The electric bicycle comprises a bicycle frame, a reverse double-crank mechanism, a speed increasing and direction changing mechanism and wheels. Thereverse double-crank mechanism comprises a driving crank, a connecting rod, an inner gear and a rack; the speed-increasing and direction-changing mechanism comprises an inner gear, an idle wheel andan outer gear; one end of the driving crank is fixedly connected with the middle shaft; the other end is provided with a screw hole screwed with the first pin shaft; the outer circle of the first pinshaft is hinged with the connecting rod; the end part is in threaded connection with the pedal plate; the other end of the connecting rod is hinged to the end face of the inner gear, the hinged pointand the rotating center point of the inner gear form a driven crank which is equal to the driving crank in length, the connecting rod and the rack are equal to each other in length and not parallel, the outer side of the idler is meshed with the inner gear, the inner side of the idler is meshed with the outer gear, and an inner hole of the outer gear is connected with a rear-wheel hub. By the adoption of the structure, due to the fact that the two cranks are opposite in rotating direction and the idle wheel changes direction, same-direction continuous transmission of the rear wheel and the pedal is achieved, and labor is saved during riding.

Description

Technical field [0001] The invention relates to a bicycle, in particular to a bicycle without a chain. Background technique [0002] At present, most bicycle transmission devices adopt sprocket and chain transmission mechanism. The technology of sprocket and chain transmission mechanism is mature. The active sprocket is installed on the central shaft, and the driven sprocket is installed on the hub of the rear wheel. The front wheel is steered and the rear wheel is driven. , The seat cushion is located in the middle, the structure is reasonable, suitable for occasions with harsh environmental conditions, it also has the characteristics of long service life, strong carrying capacity, relatively large transmission, and obvious speed increase. However, after long-term use, it is easy to wear and there are Disadvantages of skipping teeth and unlinking. In response to the phenomenon of tooth skipping and chain disconnection, relevant technicians have successively designed various cha...

AI Technical Summary

Problems solved by technology

[0002] At present, most bicycle transmission devices adopt sprocket chain transmission mechanism. The technology of sprocket chain transmission mechanism is mature. The driving sprocket is installed on the central shaft, and the driven sprocket is installed on the hub of the rear wheel. 1. The seat cushion is located in the middle, and the structure layout is reasonable. It is suitable for occasions with harsh environmental conditions. It also has the characteristics of long service life, strong bearing capacity, large transmission ratio, and obvious speed increase. However, after long-term use, it is easy to wear and tear. Disadvantages of skipping teeth and chaining

Aiming at the phenomenon of tooth skipping and chain detachment, relevant technicians have successively designed various bicycles without chains, which can be roughly summarized as follows: first, the sprocket chain transmission is changed to a harness or a synchronous belt. There are phenomena of tooth skipping and chain disengagement, but the harness and synchronous belt are not suitable for occasions with harsh environmental conditions, otherwise their lifespan will not be long; secondly, the sprocket chain transmission is changed to bevel gear transmission, due to space constraints, The transmission is relatively small, the speed increase is not obvious, and it is laborious; third, the active pedal is directly installed on the rear axle, the seat cushion is located above the rear wheel, the distance between the seat cushion and the handle becomes farther, and the front wheel becomes smaller, resulting in unreasonable structural layout , can not play the advantages of traditional bicycles

Therefore, the technology of existing chainless bicycles is not very mature, and there are always such and such problems

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