Bicycle crank shaft rod assembly

Abstract

The invention relates to a bicycle crank shaft assembly, which belongs to the field of bicycle parts. The bicycle crank shaft rod assembly comprises a left crank, a shaft rod, a tooth disc and a rightcrank. The bicycle crank shaft rod assembly is characterized in that one ends of the left crank and the shaft rod are of an integrated structure, the other end of the shaft rod penetrates through thetooth disc to be fixedly connected with the right crank, and the tooth disc is fixedly connected with the right crank. According to the bicycle crank shaft rod assembly provided by the invention, byadopting the scheme of integrating the shaft rod and the left crank, no additional locking screw or fastener is used. The bicycle crank shaft rod assembly has the characteristics of simple structure,convenience in installation and disassembly, good overall rigidity, low requirement on mechanical properties of materials, few procedures, low cost and the like.

Description

technical field [0001] The invention belongs to the technical field of bicycle components, and in particular relates to a bicycle crank shaft assembly. Background technique [0002] The main assembly methods of the crank, shaft and center shaft used in the rotating part of the bicycle today are square hole center shaft and spline center shaft. Their center shaft bearings are installed in the bottom bracket of the frame, and the shaft and shaft The bearing kit of the center shaft is a complete set that can hardly be disassembled and divided. With the bearing installed in the bottom bracket, the installation and disassembly of such structural components is cumbersome and laborious and is easily damaged. Poor, poor life, not suitable for general-purpose standard parts in broad-spectrum industries, and many manufacturing processes; another integrated center shaft structure is to separate the center shaft from the bearing, and directly combine it with the crank on one side , and...

AI Technical Summary

Problems solved by technology

[0002] The main assembly methods of the crank, shaft and center shaft used in the rotating part of the bicycle today are square hole center shaft and spline center shaft. Their center shaft bearings are installed in the bottom bracket of the frame, and the shaft and shaft The bearing kit of the center shaft is a complete set that can hardly be disassembled and divided. With the bearing installed in the bottom bracket, the installation and disassembly of such structural components is cumbersome and laborious and is easily damaged. Poor, poor life, not suitable for general-purpose standard parts in broad-spectrum industries, and many manufacturing processes; another integrated center shaft structure is to separate the center shaft from the bearing, and directly combine it with the crank on one side , and the position of the bearing is moved from the bottom bracket to the two sides. The disadvantage of this type of structural assembly is that the part where the shaft rod and the crank are integrally connected requires additional strength design or additional fasteners, which leads to low design freedom and poor quality. Larger and there is greater stress in this part, the requirements for the mechanical properties of each material are increased, the requirements for manufacturing precision are also higher, and the number of processes increases, which increases the difficulty of manufacturing and increases the cost.

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