Drum brake for electric tricycle

Abstract

The invention relates to a drum brake for an electric tricycle. The drum brake for the electric tricycle comprises a brake disc, a bridge pipe and a bearing; a processed bearing location step is arranged inside the bridge pipe; a bearing chamber for bearing installation is formed between the bearing location step and the end face of the bridge pipe; a location hole welded to an outer circle of the bridge pipe is formed in the center of the brake disc; and the bridge pipe is inserted into the location hole and fixed to the brake disc in a welding mode. According to the drum brake for the electric tricycle, a part of the position of the bearing chamber formed by the bridge pipe and the brake disc coincides with the radial position of the brake disc by changing the welding position between the brake disc and the bridge pipe; the effect that radial force of the bearing is transmitted to the bigger-diameter brake disc through the bridge pipe is guaranteed, the strength of the bridge pipe is improved and torque applied to a half shaft is reduced during braking; processing manufacturability of the bearing chamber is improved remarkably; and working accuracy is ensured.

Description

technical field [0001] The invention relates to a drum brake for an electric tricycle. Background technique [0002] At present, the popularity rate of electric tricycles is increasing rapidly, and the rear wheel brakes of most models adopt traditional drum brakes. In the traditional drum brake device, the brake disc and the bridge tube are mostly connected by bolts or the end face of the bridge tube is directly welded to the disc surface of the brake disc during welding, resulting in a low radial position coincidence between the bearing chamber and the brake disc. The radial force of the bearing exerts a large torque on the bridge tube and the half shaft, which is likely to cause the breakage of the half shaft and the deformation of the bridge tube; at the same time, since the bearing chamber needs to be finished after welding, the traditional drum brake housing is insufficient in strength, resulting in The bearing chamber in the machine is deformed, and the machining accu...

AI Technical Summary

Problems solved by technology

In the traditional drum brake device, the brake disc and the bridge tube are mostly connected by bolts or the end face of the bridge tube is directly welded to the disc surface of the brake disc during welding, resulting in a low radial position coincidence between the bearing chamber and the brake disc. The radial force of the bearing exerts a large torque on the bridge tube and the half shaft, which is likely to cause the breakage of the half shaft and the deformation of the bridge tube; at the same time, since the bearing chamber needs to be finished after welding, the traditional drum brake housing is insufficient in strength, resulting in The bearing chamber in the center is deformed, and the machining accuracy cannot be guaranteed

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