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1. (WO1980000015) IRREGULAR-WEAR PROOF RADIAL-PLY TIRE
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1980/000015 International Application No.: PCT/JP1979/000135
Publication Date: 10.01.1980 International Filing Date: 29.05.1979
IPC:
B29D 30/00 (2006.01) ,B60C 11/00 (2006.01) ,B60C 11/01 (2006.01) ,B60C 3/04 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
29
WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
D
PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
30
Producing pneumatic or solid tyres or parts thereof
B PERFORMING OPERATIONS; TRANSPORTING
60
VEHICLES IN GENERAL
C
VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
11
Tyre tread bands; Tread patterns; Anti-skid inserts
B PERFORMING OPERATIONS; TRANSPORTING
60
VEHICLES IN GENERAL
C
VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
11
Tyre tread bands; Tread patterns; Anti-skid inserts
01
Shape of the shoulders between tread and sidewall, e.g. rounded, stepped, cantilevered
B PERFORMING OPERATIONS; TRANSPORTING
60
VEHICLES IN GENERAL
C
VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
3
Tyres characterised by transverse section
04
characterised by the relative dimensions of the section, e.g. low profile
Applicants:
Inventors:
Priority Data:
78/6920907.06.1978JP
Title (EN) IRREGULAR-WEAR PROOF RADIAL-PLY TIRE
(FR) PNEU RADIAL EXEMPT D"USURE IRREGULIERE
Abstract:
(EN) An irregular-wear proof radialply tire is, for eliminating the irregular wearing at its shoulder portions, provided with a tread (5) comprising central portions (7) (7) each limited in a zone defined by W/2-0.365H (wherein W is a width, H is a height of the tire under its nominal inflation pressure) from the center line (1) of the tire, and shoulder portions (8) (8) which are each jointed to its associated central portion and liable to be subjected to the irregular wearing, said shoulder portions are formed with thick gum portions (9) (9) which are gradually thickened toward the shoulder edges. A mold (M) for fabricating the tire of this kind is provided with a tread-forming inner wall portion (5M) which is composed of two curved surfaces, one of which is a central zone-forming portion (7M) and another of which is a shoulder-forming portion (8M), the radius of the latter being larger than that of the former. A distance d between two curved surfaces each described along the radii, at the point of W/2 - O.2H (wherein W and H are the same as above) apart from the center line (1M) of the mold, is defined by; 0.4x 10-2H d 1.5 x 10-2H (wherein H is the same as above). The central portion (7) may be provided with continuous grooves extended along its circumferential direction.
(FR) Dans le but d"eliminer l"usure irreguliere d"un pneu radial au niveau de ses epaulements, un pneu radial a usure reguliere est pourvu d"une bande de roulement (5) comprenant des parties centrales (7) (7), chacune etant limitee dans une zone definie par W/2-0,365H (ou W est la largeur, H est la hauteur du pneu dans des conditions de pression nominales de gonflage) a partir de la ligne mediane (1) du pneu, et des epaulements (8) (8) joints a leurs parties centrales respectives et capables d"etre soumis a une usure irreguliere, lesdits epaulements etant forme avec des bordures epaisses (9) (9) qui s"epaississent graduellement vers les bords des epaulements. Un moule (M) de fabrication d"un pneu de ce type comprend une paroi interne de formation de la bande de roulement (5M) qui se compose de deux surfaces incurvees, l"une d"elles etant la partie de formation de la zone centrale (7M) et l"autre etant la partie de formation de l"epaulement (8M), le rayon de cette derniere etant plus grand que celui de la premiere. Une distance d entre deux surfaces incurvees le long des rayons, au point W/2 - 0,2H (ou W et H sont les memes que precedemment) de part et d"autre de la ligne mediane (1M) du moule, est definie par: 0,4 x 10-2H d 1,5 x 10-2H (ou H est le meme que precedemment). La partie centrale (7) peut etre pourvue de rainures continues circonferentielles.
Designated States:
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)