Preparation method of shuttle spokes

Abstract

A preparation method of shuttle spokes that includes these steps: providing a forging die comprising of an upper die and a lower die with the upper die and lower die having a joint angle of the shuttle spoke structure and an arch radius as well as a gap between the upper die and the lower die; inserting the blank of a round spoke into the gap between the upper die and lower die for stamping; using a plurality of nip molding rollers to eliminate the burr at both ends of the shuttle spoke structure; and applying a plurality of straightening rollers to straightness adjustment of the curved spoke body so that when the wheel parts are rolling, less air vortex can minimize air resistance.

Description

BACKGROUND OF INVENTION1. Field of the Present Invention[0001]The present invention relates generally to a preparation method of spokes, particularly a preparation method of shuttle shape spokes.2. Description of Related Art[0002]There are three types of air resistance produced by spokes, including the resistance produced by airflow hitting spokes, friction resistance, namely the friction produced by air flowing over the surface of spokes which, considering the highest speed of bicycles, almost can be ignored and exterior resistance. Generally speaking, when a wheel set is rolling at high speed, the exterior resistance is the major source of air resistance to the spokes. Flatter streamline spokes have lower wind resistance and riders can achieve a relatively high speed with fewer efforts.[0003]The round spokes have a streamline shape, which is presently the major method to reduce the exterior resistance of spokes. There are two types of low wind-resistance spokes in the market, name...

AI Technical Summary

Benefits of technology

The present invention is aimed at improving the appearance and reducing the resistance of spokes used in vehicles. It solves the issues faced with flat and arch spokes by introducing a shuttle shape spoke structure. The invention provides a method for preparing shuttle shape spokes involving steps like inserting a blank of a round spoke into a gap between an upper die and a lower die, utilizing nip molding rollers to eliminate burrs at both ends of the spoke structure, and applying straightening rollers to adjust the curved spoke body's straightness. The invention also ensures that a coning angle is formed at both ends of the spoke structure with a maximum angle of 90 degrees.

Problems solved by technology

Although flat spokes have simple lines, great resilience and good straightness, lacking a streamline shape, the flat spokes are less effective in reducing wind resistance compared to arch spokes.

In other words, during the forging and stamping process, the upper die and lower die are likely to be damaged due to collision.

Considering the restrictions of thickness, the finished products have limited streamline levels.

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