Dual tire |
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| 申请号 | US36630173 | 申请日 | 1973-06-01 | 公开(公告)号 | US3830273A | 公开(公告)日 | 1974-08-20 |
| 申请人 | MICHELIN & CIE; | 发明人 | BOILEAU J; | ||||
| 摘要 | A tire is formed with two treads spaced transversely from each other, two sidewalls terminating in beads reinforced with bead wires, and, between the treads, a connection comprising in its center a wire rod forming a closed loop of diameter intermediate between that of the bead wires and that of the treads. Each tread has its own independent reinforcement, and each sidewall has a rigid zone close to the bead and a flexible zone close to the tread. The connection has on opposite sides of the central wire rod substantially the same structure and the same equilibrium profile when the tire is inflated, and therefore the same radial flexibility, as the flexible zones of the two sidewalls. | ||||||
| 权利要求 | 1. A pneumatic tire comprising at least two treads spaced transversely from each other, two beads, a bead wire reinforcing each bead, a sidewall extending between each bead and one of the treads, and, between the treads, a connection comprising in its center a wire rod extending in the circumferential direction of the tire and forming a closed loop of diameter intermediate between that of the bead wires and that of the treads, and a separate tread reinforcement in each tread, each sidewall having a relatively rigid zone close to the adjacent bead and a relatively flexible zone close to the adjacent tread, and the connection having on opposite sides of the central wire rod substantially the same equilibrium profile when the tire is inflated and the same radial flexibility as the flexible zones of the two sidewalls. 2. A pneumatic tire according to claim 1 further comprising a radial carcass reinforcement extending through the tire from bead to bead, the connection and the flexible zones of the sidewalls being substantially free of additional reinforcement. 3. A pneumatic tire according to claim 1 wherein the connection and the flexible zone of each sidewall have substantially the same radial height. 4. A pneumatic tire according to claim 1 wherein the radial height of the connection and of the flexible zone of each sidewall is such that the meridian profiles of the connection and of the flexible zones of the sidewalls are tangent to planes perpendicular to the axis of the tire at points close to the radially inner ends of said connection and flexible zones. 5. A pneumatic tire according to claim 1 wherein the reinforcement of each tread has increased rigidity at its edges. 6. A pneumatic tire according to claim 1 wherein the reinforcement of each tread comprises two plies, the edges of one being folded around the edges of the other. 7. A pneumatic tire according to claim 1 wherein the tire is formed in two halves, each half being asymmetrical and having a tread, and the two halves forming a symmetrical whole. |
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