双杠杆撬拔省力自行车

Abstract

双杠杆撬拔省力自行车，包括车架、前叉、把手、前轮和后轮；其还包括传动系统；传动系统包括两套双杠杆撬拔传动机构；双杠杆撬拔传动机构，包括基板、曲柄、杠杆A、摇杆A、杠杆B和摇杆B；两套双杠杆撬拔传动机构共用一根转轴，即两套双杠杆撬拔传动机构的曲柄的前端分别连接在同一根转轴的两端；所述后轮在传动系统的驱动下转动，后轮直接或间接固定安装在转轴中部，后轮的轴心线与转轴的轴心线重合。本实用新型通过杠杆A和杠杆B的力臂比例设计，实现两级力放大，总省力比远超传统链传动的齿轮比极限。这使得自行车，尤其是在起步或爬坡时，更加省力。

Claims

1. Double-lever lever-operated, labor-saving bicycle, including frame, fork, handlebars, front wheel, and rear wheel; The frame has a vertically inclined main column in the middle, with a seat at the top. The front of the frame has a fork mounting hole, and the rear has a rear U-shaped frame. The closed end of the rear U-shaped frame is directly or indirectly fixed to the lower end of the main column, while the open end extends towards the rear of the frame. The front fork is rotatably mounted in the fork mounting hole of the frame, and the lower end of the front fork has a front U-shaped frame. The handlebars are horizontally arranged and fixedly connected to the upper end of the front fork. One front wheel is rotatably mounted inside the front U-shaped frame, and one rear wheel is rotatably mounted inside the rear U-shaped frame. The application is characterized in that It also includes a transmission system; the transmission system includes two sets of double-lever prying transmission mechanisms; the double-lever prying transmission mechanism includes a base plate, a crank, lever A, rocker A, lever B, and rocker B; the front end of the crank is rotatably mounted on the base plate via a rotating shaft, and the rear end of the crank is hinged to the front end of lever A; lever A has a hinge point A between its front and rear ends, and the rear end of lever A is hinged to the front end of lever B; the front end of rocker A is hinged to the base plate, and the rear end of rocker A is hinged to hinge point A of lever A; lever B has a hinge point B between its front and rear ends, and the rear end of lever B is a free end; the front end of rocker B is hinged to the base plate, and the rear end of rocker B is hinged to hinge point B of lever B; when the crank rotates in a circular motion, lever A swings up and down around hinge point A, and lever B swings up and down around hinge point B. The base plates of the two sets of double lever prying transmission mechanisms are respectively fixedly connected to the two outer sides of the rear U-shaped frame; the two sets of double lever prying transmission mechanisms share a common shaft, that is, the front ends of the cranks of the two sets of double lever prying transmission mechanisms are respectively connected to the two ends of the same shaft; the rear wheel rotates under the drive of the transmission system, and the rear wheel is directly or indirectly fixedly installed in the middle of the shaft, and the axis of the rear wheel coincides with the axis of the shaft.

2. The double lever prizing labor-saving bicycle according to claim 1, characterized in that: The drive system also includes two pedal assemblies; each pedal assembly includes a pedal shaft and a pedal fixedly mounted on the pedal shaft, with one end of the pedal shaft extending outside the pedal to form a mounting end; The two pedal assemblies are rotatably mounted on the free ends of levers B of the two double-lever prying transmission mechanisms via the mounting ends of the pedal shafts, and are arranged perpendicular to levers B.

3. The double lever prizing labor-saving bicycle according to claim 2, characterized in that: When the free end of lever B moves from the uppermost end of the swing stroke to the lowermost end and then back to the uppermost end, one cycle of the double lever prying transmission mechanism is completed. In one cycle, the crank rotates 360°.

4. The double lever prizing labor-saving bicycle according to claim 3, characterized in that: The segment of lever A between its front end and hinge point A is defined as the first resistance arm; the segment of lever A between its rear end and hinge point A is defined as the first effort arm; the segment of lever B between its front end and hinge point B is defined as the second resistance arm; the segment of lever B between its rear end and hinge point B is defined as the second effort arm; the length ratio of the first resistance arm to the first effort arm is 1:x, where x ranges from 1.5 to 2.5; the length ratio of the second resistance arm to the second effort arm is 1:y, where y ranges from 2 to 10.

5. The double lever prizing labor-saving bicycle according to claim 4, characterized in that: The value of x is 2, and the value of y is 4.

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