Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Patent
1993-12-28
1995-10-17
Johnstone, Adrienne
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
152456, 152539, 152544, 152DIG6, B60C 304, B60C 306, B60C 1502, B60C 15024
Patent
active
054581753
ABSTRACT:
The invention is directed to a pneumatic tire that can be mounted on a rim (wheel) to assure good engagement with the rim while preventing the occurrence of rim offsets. The bead portion 4a (as indicated by a solid line in FIG. 1) on the front side of a tire 1 which is later mounted on the rim has a bead base diameter .phi..sub.1, a toe portion angle .phi..sub.1, a contact angle .alpha..sub.1 , and a heel portion radius R.sub.1, whereas the bead portion 4b (as indicated by a dashed line in FIG. 1) on the back side of the tire which is first mounted on the rim has a bead base diameter .phi..sub.2, a toe portion angle .theta..sub.2, a contact angle .alpha..sub.2 and a heel portion radius R.sub.2. The bead portion 4a on the front side has a different shape than the bead portion 4b on the back side and the following two relationships hold between the two bead portions; the angle of .theta..sub.2 of the toe portion on the back side should be greater than the angle .theta..sub.1 of the toe portion on the front side, with the difference between the two angles being not more than 4.degree. (4.degree..gtoreq..theta..sub.2 -.theta..sub.1 >0.degree.); and the bead base diameter .phi..sub.2 on the back side should be greater than the bead base diameter .phi..sub.1 on the front side (.phi..sub.2 >.phi..sub.1); preferably, the difference between the bead base diameters on the two sides (.phi..sub.2 -.phi..sub.1) is 2 mm or less (.phi..sub.2 -.phi..sub.1 .ltoreq.2 mm).
REFERENCES:
patent: 3229744 (1966-01-01), Bradley
patent: 3656532 (1972-04-01), Roberts
patent: 3842882 (1974-10-01), Gough et al.
patent: 4124679 (1978-11-01), DeWitt
patent: 4271889 (1981-06-01), Pommier
patent: 4351382 (1982-09-01), Corner et al.
patent: 5301728 (1994-04-01), Brown, Jr. et al.
Matsuura Shinichi
Tagashira Kenji
Johnstone Adrienne
Sumitomo Rubber Industries Ltd.
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