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.

    本发明提供了一种自行车齿轮传动机构,包括双棘轮后车轮、小齿轮、扇形内齿轮、机架、定滑轮、脚踏和绳索;两个小齿轮安装在双棘轮后车轮上,然后分别与扇形内齿轮相啮合。扇形内齿轮安装在车架下部两侧的芯轴上。扇形内齿轮前端的杠杆臂上安装有脚踏,通过脚踩踏板的不同位置可改变力臂长短,实现变速。两个扇形内齿轮前端的杠杆臂用绳索绕过安装在机架上的定滑轮,连接在一起,保证脚踏联动。本发明使得骑行以上、下往复运动取代圆周运动,能借助人体自身的重力做功,最大限度的发挥人体结构的用力功能,减少人体不必要的施力,改善骑者舒适性,本发明部件数量少,设计合理,易加工维护,易于传动防护和密封润滑,易于大范围推广。


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    Title :

    Bicycle gear transmission mechanism


    Additional title:

    一种自行车齿轮传动机构


    Contributors:

    Publication date :

    2021-06-01


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer



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