SHOULDER TO PROTECT TYRE SIDEWALLS SHOULDER TO PROTECT TYRE SIDEWALLS

摘要

1427178 Pneumatic tyres BRIDGESTONE TIRE KK 17 May 1973 [5 Aug 1972] 23664/73 Heading B7C A pneumatic rubber tyre 10 for off-road construction vehicles, comprises an annular tread rubber having a pair of mutually-parallel side edge corners S, a carcass 1 extending between the tyre beads, a breaker layer between the tread rubber and the carcass, and a respective protective projection 6 provided on each tyre sidewall 5, each projection 6 projecting axially outwardly beyond the outermost portion of the associated sidewall, even under loaded conditions, and each projection 6 having a radially outer periperhal edge 8 spaced at a radial distance y, from the corresponding side edge corner S of between 10% and 30% of the tyre cross-sectional height H, and having a radially inner peripheral edge 9 spaced at a radial distance y 2 from the corresponding side edge corner S of between 35% and 45% of the tyre cross-sectional height H. The projections 6 are intended to prevent sharp objects from striking the tyre sidewalls. As shown in Fig. 5 the projections 6 take the form of continuous annular members integrally formed with the tyre sidewalls. In an alternative form narrow grooves may be formed at spaced intervals in the projections. In the embodiment of Fig. 5 the carcass 1 comprises radial steel cords and breaker layers 2 are provided. Sidewall reinforcements may be formed by turning up the carcass cords or by providing separate cord portions 1b. The cord portions 1b may be formed of nylon or polyester.