A tire apparatus is provided, the apparatus including a tire body for attachment to a wheel rim to define a first inflatable volume. An inner chamber defines a second inflatable volume which is located within the first inflatable volume of the tire body. A first fluid communication path is provided between the first and second inflatable volumes and a second fluid communication path is provided between the first inflatable volume and the atmosphere. A first valve opens and closes the first fluid communication path, and a second valve opens and closes the second fluid communication path. The tensile strength and pressure-containing capacity of the material structure of the second inflatable volume is greater than that of the tire first inflatable volume. A first fluid pressure within the first inflatable volume of the tire body is optimisable by opening the first valve to allow pressure transfer from the second inflatable volume into the tire body, and/or opening the second valve to allow pressure to vent from the tire body to atmosphere. A vehicle wheel and active tire pressure control system incorporating the tire apparatus are also provided.

An insert for a pneumatic tire including an annular member adapted to contact at least 10% of an interior surface of the pneumatic tire and provide an outward pressure thereagainst.

An insert for a pneumatic tire including an annular member adapted to contact at least 10% of an interior surface of the pneumatic tire and provide an outward pressure thereagainst.

A balanced non-deflatable vehicle tire providing balanced operation even after partial puncture, adjustment of overall air pressure, use of standard rimmed wheels, and the option of being retrofit into existing tires, by providing alternating layers of puncture-resistant sheet material and pressurized-cell sheets, and an inner-tube to fill the remaining internal space and to adjust and apply balanced pressure internally.

A balanced non-deflatable vehicle tire providing balanced operation even after partial puncture, adjustment of overall air pressure, use of standard rimmed wheels, and the option of being retrofit into existing tires, by providing alternating layers of puncture-resistant sheet material and pressurized-cell sheets, and an inner-tube to fill the remaining internal space and to adjust and apply balanced pressure internally.

An insert for a pneumatic tire including an annular member adapted to contact at least 10% of an interior surface of the pneumatic tire and provide an outward pressure thereagainst.

An insert for a pneumatic tire including an annular member adapted to contact at least 10% of an interior surface of the pneumatic tire and provide an outward pressure thereagainst.

A self-inflating pumping mechanism for tires or tubes is provided. Two arc-shaped lever arms connected through a hinge enclose a lumen/collapsible cavity below the hinge. The design provides great mechanical leverage, which is generated by the lever arms and exerted directly onto the lumen. This translates into higher pumping pressures, lower activation loads, better ride quality and lower energy consumption. The design has a lumen that is mechanically isolated from the inner tube or air pressure in the main cavity of the inner tube, avoiding the need to reinforce the lumen against the pressure of the tire. The lever arms and hinge carry the load directly above the lumen and transfer the load directly to the tire

A pressure safeguard device (1) for wheels filled with compressed gas comprises at least two tubes which are arranged next to one another in such a way as to run around the tire axis, each of said tubes having a supply line (3) for compressed gas and a common supply connection (4). On each supply line (3), a connectable and releasable connection is formed between the tube (2) and the common supply connection (4). Preferably, the tubes (2) are releasably connected, by means of a connection device (5, 6) which is separate from the tire, so as to form a stack of tubes (2) which directly adjoin one another along their circumference by way of side regions. If one tube (2) is damaged, the other tubes (2) remain intact and expand together into the entire area between the rim (7) and the tire (8). By topping up the intact tubes with compressed gas, the desired tire pressure can be achieved without changing the wheel or the tire.

A pressure safeguard device (1) for wheels filled with compressed gas comprises at least two tubes which are arranged next to one another in such a way as to run around the tire axis, each of said tubes having a supply line (3) for compressed gas and a common supply connection (4). On each supply line (3), a connectable and releasable connection is formed between the tube (2) and the common supply connection (4). Preferably, the tubes (2) are releasably connected, by means of a connection device (5, 6) which is separate from the tire, so as to form a stack of tubes (2) which directly adjoin one another along their circumference by way of side regions. If one tube (2) is damaged, the other tubes (2) remain intact and expand together into the entire area between the rim (7) and the tire (8). By topping up the intact tubes with compressed gas, the desired tire pressure can be achieved without changing the wheel or the tire.