Bicycle Wheel |
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| 申请号 | EP99126082.9 | 申请日 | 1999-12-28 | 公开(公告)号 | EP1016552A3 | 公开(公告)日 | 2003-05-21 |
| 申请人 | SHIMANO INC.; | 发明人 | Toshio, Mizuno; Sugimoto, Masanori; Shimizu, Koji; | ||||
| 摘要 | A bicycle wheel (12) basically has a hub, a plurality of spokes (22a, 22b) extending outwardly from the hub and an annular rim (24) coupled to the outer ends (52a, 52b) of the spokes (22a, 22b) for supporting a tire (26). The annular rim (24) has a spoke attachment portion with a plurality of openings for receiving the outer ends of the spokes therein. In the most preferred embodiment, bicycle wheel (12) is a one-piece, unitary wheel. Preferably, the one-piece, unitary bicycle wheel (12) of the present invention is produced by die-casting. The preferred material for bicycle wheel of the present invention is magnesium (Mg). A centrally located rib portion (28) is located between adjacent spoke portions and to reinforce the rim portion (24) between spokes. Rib portions (28) extend radially inwardly from the inner peripheral surface of rim portion (24). Preferably, the middle segment of each of the rib portions (28) has a radial height that is approximately equal to the base rim height plus more than half of the base rim height. The shapes of spoke portions are designed to absorb the vibrations form the ground as it is being used in the bicycle. This shock absorbing function is enhanced by the use of magnesium for wheel. | ||||||
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