Mounting structure of centrally-mounted motor and power-assisted bicycle

Abstract

The invention relates to the technical field of power-assisted bicycles, in particular to a mounting structure of a centrally-mounted motor and a power-assisted bicycle. The mounting structure of the centrally-mounted motor comprises a motor assembly, a connecting frame, fasteners and a stretching protection sleeve, a through mounting hole is formed in the motor assembly, the connecting frame comprises two connecting arms located at the two ends of the mounting hole in the length direction respectively, the stretching protection sleeve is arranged in the mounting hole in a penetrating mode, and the two ends of the stretching protection sleeve are connected with the fasteners. The fasteners penetrate through the connecting arms and are fixed to the stretching protective sleeve so as to fix the motor assembly and the connecting frame. Due to the fact that the stretching protection sleeve can be stretched and deformed under the action of the pre-tightening force of the fasteners, compensation is provided for the gap between the motor assembly and the connecting frame, the motor assembly and the connecting frame are prevented from being deformed and even broken under the action of the pre-tightening force, and protection on the motor assembly and the connecting frame is improved. The power-assisted bicycle adopts the mounting structure of the centrally-mounted motor so that the motor assembly and the frame are stably fixed, and the protection on the motor assembly is improved.

Description

technical field [0001] The invention relates to the technical field of power-assisted bicycles, in particular to an installation structure of a central motor and a power-assisted bicycle. Background technique [0002] The power assist bicycle is a new type of transportation with a power assist system that can realize the integration of human riding and electric power assist. The power-assisted bicycle is provided with a central motor, and the central motor is fixed on the vehicle frame, thereby providing power assistance for the power-assisted bicycle. [0003] In the prior art, when the central motor is installed on the vehicle frame, in order to prevent the central motor from shaking and swinging on the vehicle frame during riding, usually both sides of the motor assembly are fixed to the vehicle frame by bolts. on a fixed link. However, in the actual processing and manufacturing process, there is a gap between the motor assembly and the connecting frame due to tolerance...

AI Technical Summary

Problems solved by technology

However, due to the gap between the motor assembly and the connecting frame, when the two sides of the motor assembly are fastened to the connecting frame by bolts, if the pre-tightening force of the bolts on both sides is too large, large gaps will be generated on both sides of the motor assembly. In addition, the bolts are usually made of steel, and the motor components and connecting frames are usually made of aluminum alloy or magnesium alloy. The rigidity of the motor components and connecting frames is less than that of the bolts, resulting in deformation of the connecting frame or motor components. , or even broken, affecting the service life of the mid-mounted motor

If the pre-tightening force of the bolts is too small, the fixation between the motor assembly and the connecting frame will be unstable, the motor assembly will easily loosen, and shaking and swinging will occur during riding

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