The portable folding bicycle is a kind of bicycle that is easy to carry on the train and climb the stairs. It overcomes the shortcomings of the existing folding bicycle structure that is too heavy and large to carry, that is, it is still hard to go upstairs and get on the bus (subway), and that the folding bicycle cannot fully play its role. A classification of bicycles. Generally, folding bicycle is composed of frame folding joint and riser folding joint. By folding the frame and folding the front and rear wheels together, the length can be reduced by about 45%. After folding, the entire vehicle can be placed in the trunk, folding bag, and trunk of the car. During the folding process, the car can be manually folded and unfolded without the need for external tools. After folding, use the seat rod as a support point to ensure stability after folding. The folding bicycle is convenient and comfortable to carry and use, and the production process is mature. ① Body part: including the frame, front fork, handlebars, saddle, and front fork assembly, it is the main body of the bicycle.
② Transmission part: including pedals, cranks, sprockets, chains, center shafts, and flywheels, etc. The pedals are manually stepped on, and the above transmission components drive the wheels to rotate and drive the car forward.
③ Action section: front and rear wheels, including front and rear axle components, spokes, rims (rims), tires, etc.
④ Safety devices: including brakes (brakes), lights, bells, reflective devices, etc.
According to needs, some accessories can also be added, such as brackets, hangers, safety forks, mudguards, air cylinders, etc. In addition, sports cars and racing cars equipped with a transmission mechanism