A dual wheel tyre inflation pressure control system including a pair of vehicle wheels having tyre interiors providing first and second fluid chambers. A first valve arrangement is installed remote from the wheels and is connectable to a pressurised fluid source. A second valve arrangement, suitably mounted on one of the wheels, is connected to the first valve arrangement by means of first and second fluid connections. The second valve arrangement is controllably operable to connect the first fluid connection to either fluid chamber. Controlled variation of fluid pressure in and between the fluid connections is provided by the first valve arrangement to control said second valve arrangement for operating the tyre pressure control system to connect the second fluid chamber to the first valve arrangement, and to connect the first and second fluid chambers.

A wheel unit of a vehicle having a rim on which a tire is mounted, and having a hub which can rotate about an axis of rotation (T), wherein the hub includes a hub body in which a control element that is mounted such that it is displaceable relative to the hub body in the direction of the axis of rotation (T) between a first position and a second position is accommodated. A fluid channel which fluidically connects the tire to a first space formed between the control element and the hub body is configured in the rim. In the first position of the control element, a fluidic connection between the first space and a second space formed between the control element and the rim is interrupted, whereas, in the second position of the control element, a fluidic connection between the first space and the second space is established.

A pressure adjustment device for adjusting air pressure within a tire of a vehicle is disclosed. The device includes a housing formed of a cap and a base and including a piston, a spring and an air valve, wherein the cap includes an air inlet and the base includes an air outlet that is in fluid communication with the neck, wherein the piston moves proximally to compress the spring in response to a presence of a centrifugal force due to the vehicle traveling at least at a predetermined speed, where the proximal movement of the piston activates the air valve thereby enabling fluid to flow into the housing, and where the spring is configured to decompress when the centrifugal force decreases thereby deactivating the air valve and compressing the fluid within the housing distally out the air outlet toward the tire.

An axle assembly having a hose, a spindle plug, a sleeve, and a rotary union adapted to be fluidly connected to a tire. The spindle plug may be disposed in a spindle. The hose may be fluidly connected to the rotary union. The sleeve may encircle the hose and extend from the spindle plug to a stator of the rotary union. The sleeve cooperates with the spindle plug to limit rotation of the stator and the hose.

A connection arrangement for a tire inflation system. The connection arrangement includes a rotary union and a hose assembly. A main body of the hose assembly is insertable into and removeable from a receptacle cavity of the rotary union when in a first rotational position. A locking protrusion of the hose assembly is received in the locking opening of the rotary union to secure the main body to the rotary union when in the second rotational position.

A central tire inflation system configured to maintain an air pressure on a first and second tire mounted to a wheel of a vehicle including a wheel assembly configured to be operably coupled to the wheel and including (1) a housing in fluid communication with an external air supply, (2) two check valves carried by the housing and in fluid communication with the air supply, (3) two tire air connectors carried by the housing and in fluid communication with the two check valves, respectively, and configured to be operably coupled to the two tires, respectively. The first tire, second tire, and air supply in fluid communication when both the first check valve and the second check valve are in an open position but not in fluid communication when either the first check valve or the second check valve is in a closed position.

An air supply system includes: a telescopic pump attached to a wheel and discharging compressed air into a tire by extending and contracting; a cam member rotatably supported on the wheel and having a center of gravity eccentric to the wheel and an annular cam surface eccentric to the wheel, wherein the cam member rotating relative to the wheel as the wheel rotates, with one end part of the pump following the cam surface, causing the pump to extend and contract to supply air into the tire by a rotary power of the wheel; and a pump on/off mechanism that is activated upon receiving a pressure inside the tire, allowing the pump to operate when the pressure is at or below a reference lower limit, and stopping the pump when the pressure is at or above a reference upper limit that is larger than the reference lower limit.

A wheel end assembly having a spindle, a hub, and a rotary seal assembly. The spindle defines a spindle air passage, a vent passage, and a spindle hole. The hub defines a hub air passage. The rotary seal assembly fluidly connects the spindle air passage to the hub air passage. The vent passage fluidly connects an inboard cavity to the spindle hole.

A pneumatic pressure controller includes a body, an inflation plunger, a vent and a deflation diaphragm or piston. The body defines an input chamber and an output chamber for connection of a pneumatic pressure source and pneumatic container respectively. The plunger is biased towards a closed condition wherein it inhibits fluid flow from the input chamber to the output chamber and is movable against the bias to allow such fluid flow for inflation of the pneumatic container. The diaphragm or piston is variably biased towards a closed condition wherein it closes the vent. The diaphragm or piston is configured to move away from the vent to an open condition under the influence of fluid pressure in the output chamber when the inflation plunger is in the closed condition and the variable bias is sufficiently reduced, enabling fluid from the pneumatic container to egress to the atmosphere via the vent.

A tyre pressure sensing module for fitting to a rim of a wheel of a vehicle, the rim configured to accommodate a tyre. The tyre pressure sensing module comprises a pressure sensor apparatus configured to sense a pressure of a fluid retained within the tyre, and a sensor mount. The sensor mount is for securing the pressure sensor apparatus to the rim of the wheel. The sensor mount comprises a mounting area configured to be adhered to the rim and that is deformable to accommodate a radius of the rim.