Lightweight bicycle wheel rim and method for producing it

一种自行车、轮缘的技术，应用在轻质高性能车轮及其制造领域，能够解决重量损失、降低轮子旋转惯量特性等问题

Inactive Publication Date: 2007-03-28
威廉·B·舒克
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a weight loss associated with the deep V-section aero rim produced by this method and, since this weight is on or near the exterior of the wheel, it reduces the moment of inertia characteristics of the wheel

Method used

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  • Lightweight bicycle wheel rim and method for producing it
  • Lightweight bicycle wheel rim and method for producing it
  • Lightweight bicycle wheel rim and method for producing it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] Referring to FIG. 1, the linear extrusion indicated at 10 includes a rim base or spoke base 12, opposing braking surfaces 14 and opposing side walls 16 extending between the spoke bases 12 and braking surfaces 14. A transverse edge 18 extends between the two upper parts of the extrusion 10 , close to the braking surface 14 . A bead 20 extends upwardly from the transverse rim 18 and terminates in a bead hook 22 . The crimp tab 24 is engaged on the spoke base 12 by a thin neck 26 . Line 28 at a distance L1 from the bottom of spoke base 12 represents the neutral center of bending of extrusion 10; that is, when a length of extrusion 10 made of a typical rim alloy is rolled into a rim shape, line 28 and the transverse Portions of the sidewall 16 between the edges 18 are compressed under tension, and those portions of the sidewall further away from the transverse edges 18 are compressed and subjected to twisting. The sidewall 16 (eg extruded) has the thickness required for ...

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PUM

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Abstract

A method for producing a bicycle wheel rim is disclosed. The method involves extruding a thin-walled, hollow body having the cross-sectional shape of the rim and an integral external tab. The walls of the hollow body are sufficiently thin that a length of the hollow body without the external tab is subject to buckling when roll formed to produce a rim. The tab is so positioned and sized that the hollow body with the integral external tab is not subject to buckling when roll formed. A portion of the extrusion is then rolled to a circular shape; the circular portion is cut from the extrusion; the free ends are connected, and the external tab is removed from the circular portion of the extrusion.

Description

technical field [0001] The present invention relates generally to rims for human-powered vehicles such as bicycles, wheelchairs, etc., and in particular to lightweight high-performance wheels having a lightweight rim with a thin-walled deep section and a method of making the same. Background technique [0002] A great deal of effort has been put into reducing the weight of human-powered rims, especially bicycle rims. Bicycle rims are typically produced by extruding an aluminum alloy or the like to form a linear extrusion with a cross-section corresponding to the finished rim, rolling the extrusion into a circle, cutting the extrusion to length and pinning, plugging or welding Connect the free end to production. In the case of deep V-shaped, air rims, the crimping of the linear extrusion exerts enormous forces on the extrusion. These forces are far in excess of what a finished rim would have to withstand when used on a bicycle. Consequently, the thickness of the rim wall i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P13/00B60B21/02
CPCB21C35/026B21D53/30B21C23/12B21C23/142B60B21/04B21K1/38B23P13/04B60B21/025B60B21/062Y10T29/49529Y10T29/49524Y10T29/49506Y10T29/49531
Inventor 威廉·B·舒克
Owner 威廉·B·舒克
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