Dynamic fatigue testing machine for bicycle crank assembly

Abstract

The invention relates to a dynamic fatigue testing machine for a bicycle crank assembly. The machine is characterized by comprising a machine body, servo cylinders, a central shaft clamp and a chain clamp, a top plate is fixed on the machine body by a support, the chain clamp and the central shaft clamp are fixed on the machine body in parallel, the number of the servo cylinders is two, and the servo cylinders are fixed on the lower edge of the top plate, the top end of piston rods of the servo cylinders are respectively connected with connecting rods, the length of the connecting rods is adjustable, regulating nuts which can regulate the length of the connecting rods are arranged on the connecting rods, a displacement transducer and a force transducer are respectively arranged on the piston rods of the servo cylinders. Pneumatic servo valves are arranged on gas paths of the servo cylinders; and the pneumatic servo valves, the displacement transducer and the force transducer are connected with an external computer by signal lines. The dynamic fatigue testing machine can help precisely detect the dynamic fatigue strength of the bicycle crank assembly and realize automatic control by the computer, which ensures the quality of the produced fittings to meet requirements.

Description

technical field [0001] The invention relates to a bicycle accessory testing machine, in particular to a dynamic fatigue testing machine for a bicycle crank assembly, and belongs to the technical field of detection devices. Background technique [0002] Bicycles are very popular because of their environmental protection, convenience, low price and other characteristics. Especially in China with a large population, bicycles are very popular. [0003] The bicycle uses the crank assembly to convert the pedaling force of the person into the rotational force of the wheel to achieve the purpose of making the bicycle move forward. When riding, the person's two legs alternately exert force, stepping on the pedals, so that the sprocket rotates, and the rear wheel is driven to rotate through the chain. Therefore, during riding, the crank assembly will be subject to an alternating force and will be in a state of vibration. If the dynamic fatigue strength of the crank assembly is not e...

AI Technical Summary

Problems solved by technology

Therefore, during riding, the crank assembly will be subjected to an alternating force and will be in a state of vibration. If the dynamic fatigue strength of the crank assembly is not enough, it is easy to break the crank assembly during riding. Stepping down on the pedals hard, it is easy to cause a rollover accident and cause the rider to be injured

However, there is currently no detection device that can qualitatively detect the crank assembly before leaving the factory. It can only be judged by the experience of the workers, which is prone to errors.

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