Lower tube of electric bicycle

Abstract

Provided is a lower tube of an electric bicycle. A combined lower tube of a groove tube and a buckling tube is adopted by the lower tube of the electric bicycle. A longitudinal whole appearance of the lower tube is in a straight shape, an arc shape or other anomalous shapes. An outer appearance of a whole cross section of the lower tube is mainly in the straight shape and the arc shape, and the periphery of the cross section of the lower tube is closed, symmetrical, coordinated, smooth, and even. A section of the groove tube is mainly U-shaped, the groove tube is solid or hollow, when the groove tube is hollow, and the inner wall and the outer wall of the groove tube are connected and are supported through a rib plate or without the rib plate. The thickness of the groove tube is gradually reduced from two ends to the middle so as to enable the groove tube to be light in weight and good in strength. A cross section of the buckling tube is U-shaped or is in other anomalous shapes. Load can be safety borne by the groove tube. The buckling tube is easy to manufacture, can satisfy different modeling and using requirements. A sealed space exists between the groove tube and the buckling tube, and can be used for containing a battery, a controller, a plug-in unit, a wire, a brake cable and the like. Due to the fact that the combined lower tube is adopted to manufacture the electric bicycle, the electric bicycle is low in manufacturing cost, simple in structure, light in weight, long in service life, balanced in weight, comfortable to ride, convenient to use, and novel, special, coordinated, lively, smooth, artistic and elegant in appearance.

Description

technical field [0001] The invention relates to a down tube of an electric bicycle. Background technique [0002] One of the main parts of the electric bicycle is the frame, and one of the main parts of the frame is the down tube. At present, the known longitudinal main shape of the down tube is mainly a straight tube or a curved tube, and the section of the down tube is mainly a round tube or an oblate tube, and all of them are now integral down tubes. At present, most of the battery boxes of known electric bicycles are at the rear of the standpipe of the frame, and some electric vehicle wires and brake wires are arranged outside the lower tube, and wire positioning parts must be added on the lower tube; In the pipe, at this time, the inlet and outlet holes will be opened at the front and back of the lower pipe, and the openings will be reinforced with reinforcing pieces. Therefore, some existing electric bicycles are not attractive in appearance, high in manufacturing co...

AI Technical Summary

Problems solved by technology

Therefore, some existing electric bicycles have unattractive appearance, high manufacturing cost, high center of gravity, large rear wheel load, and inconvenient use.

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