Rim for a bicycle spoked wheel, process suitable for manufacturing it, and relative spoked wheel

A technology for bicycles and spoked wheels, applied to spoked wheels, wheels, rims, etc., can solve the problems of increased fatigue fracture, increased stress of wheel elements, loss of stiffness, high tension force, etc.

Pending Publication Date: 2008-03-05
CAMPAGNOLO SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will result in a loss of stiffness in the lateral direction of the wheel and high tension on said spokes
Said increased tension on the spokes increases the stress on the wheel components (spokes and rim), which increases the likelihood of fatigue fractures

Method used

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  • Rim for a bicycle spoked wheel, process suitable for manufacturing it, and relative spoked wheel
  • Rim for a bicycle spoked wheel, process suitable for manufacturing it, and relative spoked wheel
  • Rim for a bicycle spoked wheel, process suitable for manufacturing it, and relative spoked wheel

Examples

Experimental program
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Effect test

Embodiment Construction

[0102] Figure 1 shows a wheel 1 with a rim 2 according to a first embodiment of the invention.

[0103] The wheel 1 is a rear wheel with seven triplets, each said triplet comprising three spokes 3, 4, 5 in the area of ​​seven spoke connections between the hub M1 and said rim 2 7 between tension. Between adjacent spoke connection areas 7 , the rim 2 has seven sub-spoke areas 8 .

[0104] Two sides A, B are defined in the wheel 1 and in the corresponding rim 2 , a first side fixed to the hub M1 on one side of the pinion support S and a second side on the opposite side.

[0105] Said side spokes 3, 5 of each triplet extend tangentially from said hub M1 on a first side A, while central spokes 4 of each triplet extend from said hub M1 on said second side B Extend radially.

[0106] Thus, there are twice as many spokes 3 , 5 (fourteen) on the first side A as there are spokes 4 on the second side B (seven).

[0107] As can be seen from the cross-sectional view of FIG. 2 , the inc...

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Abstract

A rim (122) for a bicycle spoked wheel (121) is disclosed that has a change of radial section of the side walls (13, 14). Through changes of symmetry / asymmetry with respect to a middle plane and / or changes of radial extent, it is possible to improve the performance of the rim in terms of balance, camber angles and / or strength. Preferably, the radial section is variable, still of constant area along the circumference, apart from holes (123a, 124a, 125a) for the attachment of spokes and possible openings (123b, 124b, 125b) for the passage of nipples. A process for manufacturing a rim for a bicycle wheel is also described, comprising hydroforming a tubular extruded piece to locally change the section of the side walls (13, 14).

Description

technical field [0001] The invention relates to a rim for a spoked bicycle wheel, a method suitable for its manufacture and a spoked bicycle wheel comprising such a rim. Background technique [0002] As is known, a spoked bicycle wheel is formed from a peripheral circumference or rim, a central hub and a plurality of spokes connecting said hub to a spoke attachment area of ​​said rim. Conventional rims have a radial section which is symmetrical with respect to the median plane, also in the region of said spoke attachments. The ends of the spokes connected to the rim on one side and to the hub on the other side define an arrangement in which the spokes themselves are inclined relative to the median plane by an angle expressed as the camber of the wheel. [0003] In the conventional rim described above, when the points of attachment of the spokes to the hub are equidistant from said mid-plane, the first group of spokes connecting the rim to the first end of the hub, and the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60B21/06
CPCB60B1/0215B60B21/062B60B21/04B60B21/064B60B1/003B60B21/025
Inventor 朱塞佩·达尔普拉′达维德·乌尔巴尼
Owner CAMPAGNOLO SRL
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