后双轮驱动型双杠杆撬拔省力三轮车

Abstract

后双轮驱动型双杠杆撬拔省力三轮车，包括车架、前叉、前轮、车斗、后轮和传动系统；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的基板分别固定连接在两条水平杆A的外侧，两套双杠杆撬拔传动机构共用一根转轴；所述转轴与所述后轮轴动力关联，以使转轴转动的同时带动后轮轴及两后轮转动。本实用新型的优点在于：通过杠杆A和杠杆B的力臂比例设计，实现两级力放大，远超传统链传动的齿轮比极限。这使得驱动后双轮驱动型三轮车，尤其是在起步或爬坡时，更加省力。

Claims

1. A rear dual-wheel drive type double-lever lever-operated labor-saving tricycle, characterized by: This includes the frame, front fork, front wheel, front axle, cargo box, rear axle, rear wheel, and drivetrain. The frame has a vertically inclined main rod in the middle, with a seat at the top. A fork frame is located at the front, with fork mounting holes. A U-shaped frame is located at the rear, with a first U-shaped section and a second U-shaped section connected sequentially from the closed end to the open end. The width of the second U-shaped section is greater than the width of the first U-shaped section. The first U-shaped section includes two parallel horizontal bars A, and the second U-shaped section includes two parallel horizontal bars B. The closed end of the U-shaped frame is fixedly connected to the lower end of the main rod, and the open end extends towards the rear end of the frame. The fork is rotatably mounted in the fork mounting holes. The front wheel is rotatably mounted on the lower end of the front fork via a front wheel axle. The bucket is fixedly mounted on the upper end of the second U-shaped section, located above the middle of the rear end of the frame. The rear wheel axle is rotatably mounted on the two horizontal bars B, with both ends extending outwards from the second U-shaped section. Two rear wheels are mounted on both ends of the rear wheel axle, both located outwards from the second U-shaped section. The transmission system includes two sets of double-lever prying transmission mechanisms; each 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 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... Hinged to the base plate, the rear end of rocker arm B is hinged to hinge point B of lever B; when the crank rotates in a circle, 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 outside of the two horizontal rods A, and the two sets of double lever prying transmission mechanisms share a rotating shaft; 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 rotating shaft; the rotating shaft is power-connected to the rear wheel axle, so that when the rotating shaft rotates, it drives the rear wheel axle and the two rear wheels to rotate.

2. The rear dual-wheel drive type double-lever prying labor-saving tricycle according to claim 1, characterized by: The rotating shaft and the rear wheel axle are poweredly connected through a sprocket and chain pair; the sprocket and chain pair includes a driving sprocket, a driven sprocket, and a chain; the driving sprocket is fixedly installed in the middle of the rotating shaft, the driven sprocket is fixedly installed in the middle of the rear wheel axle, and the chain is wound between the driving sprocket and the driven sprocket.

3. The rear dual wheel drive type double lever prizing labor-saving tricycle according to claim 2, 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.

4. The rear dual wheel drive type double lever prizing labor-saving tricycle according to claim 3, characterized in that: When the free end of lever B moves from the top of the swing stroke to the bottom and then back to the top, the crank rotates 360°.

5. The rear dual wheel drive type double lever prizing labor-saving tricycle according to claim 4, 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.

6. The rear dual wheel drive type double lever prizing labor-saving tricycle according to claim 5, characterized in that: The value of x is 2, and the value of y is 4.

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