GB956576A - Improvements in or relating to pneumatic tyres for vehicles - Google Patents

Abstract

956,576. Pneumatic tyres. CONTINENTAL GUMMI-WERKE A.G. Oct. 3, 1960 [Dec. 21, 1959], No. 33791/60. Heading B7C. To increase the lateral stability, a pneumatic tyre 1 has a hollow cylindrical substantially inextensible reinforcing member 4 within the air space of the tyre facing the tread portion 8, the band being stiffened in its centre region by a flat band 9 of sheet steel, polyamide or the like, and having its edges formed of rubber with or without inextensible circumferential cords 11 therein, and being either supported on an inner air tube 7, Fig. 1, or integral with the outer periphery of an inner tubeless air-retaining body 18, Fig. 2, so that it extends axially at 15 into contact with the sidewalls 12 of the tyre 1 and is spaced radially inwardly from the inner surface of the tyre tread 5 by a distance which is equal to, or slightly greater than the extent H of normal load deflection of the tread. The inner air space 6 of the tube 7 or body 18 is inflated to a higher pressure than the out space 5, and the reinforcement band 4 is brought into play only on radial road shocks, or by lateral tread forces 17 when, as shown in Fig. 3 in broken lines, one sidewall is then braced by the edge of the band. The band 9 and circumferential cords 11 may be embedded in rubber 14, the cord-reinforced edge portions 10 of the band 4 being more deformable than the central portion. Alternatively, the edge portions may comprise inflated hollow rubber cushions 23, Fig. 3. In the Fig. 2 construction, the inner body 18 is formed with bead cores 2<SP>1</SP> and radial reinforcing cords extending from bead to bead, the tyre proper in this case having unreinforced sidewalls the edges 20 of which are clamped between the beads 21 of the inner body 18 and the wheel rim 22. In a further arrangement, the reinforcement band 9 and cords 11 may be detachably seated in spaced circumferential grooves in the periphery of a tubular inner body.