Bicycle gear transmission mechanism

Abstract

The invention provides a bicycle gear transmission mechanism. The bicycle gear transmission mechanism comprises a double-ratchet rear wheel, pinions, fan-shaped inner gears, a rack, a fixed pulley, pedals and a rope. The two pinions are arranged on the double-ratchet rear wheel and then are respectively meshed with the fan-shaped inner gears. The fan-shaped inner gears are arranged on mandrels on two sides of the lower part of a frame. The pedals are installed on lever arms at the front ends of the fan-shaped inner gears, the length of a force arm can be changed by stepping on different positions of the pedals, and speed changing is achieved. The lever arms at the front ends of the two fan-shaped inner gears are wound around the fixed pulley installed on the rack through the rope to be connected together, and pedal linkage is guaranteed. Circumferential motion is replaced by vertical reciprocating motion during riding, work can be done by means of the gravity of a human body, the force exerting function of the human body structure is exerted to the maximum extent, unnecessary force exerting of the human body is reduced, the comfort of a rider is improved, the number of parts is small, design is reasonable, machining and maintenance are easy, transmission protection and sealing lubrication are easy, and large-scale popularization is easy.

Description

technical field [0001] The invention belongs to the field of bicycle transmission and is a novel bicycle transmission mechanism. Background technique [0002] The transmission system of existing bicycles mostly uses chain transmission, and maintenance measures such as lubricating oil are often required. The chain is near the trousers, and the trousers are often stained with oil. After a long period of use, the chain will drop, unlink, and skip teeth. , If the chain is dropped and installed, it will also cause oily hands. The chain sprockets of general quality will be replaced in a short period of time due to wear. [0003] Existing bicycles are driven by the feet during riding, and the crank rotates in circles. The torque goes from zero to maximum and then to zero again and again. In addition, the transmission efficiency of the chain drive is slightly low, and the cyclist will consume more physical strength for long-distance riding, resulting in the comfort range of ordinar...

AI Technical Summary

Problems solved by technology

[0003] Existing bicycles are driven by the feet during riding, and the crank rotates in circles. The torque goes from zero to maximum and then to zero again and again. In addition, the transmission efficiency of the chain drive is slightly low, and the cyclist will consume more physical strength for long-distance riding, resulting in the comfort range of ordinary people riding an ordinary non-variable bicycle can only be within a short distance of two to three kilometers. The range is large, and people with slightly better physical strength will feel soreness and discomfort in the knee joints after about ten kilometers. It is difficult for ordinary people to ride long distances.

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