The present disclosure relates a device that includes a rotary union body. Included with the rotary union body is a circumferential air channel, a seal channel, and an intake air channel. The intake air channel is connected to the circumferential air channel. Also disclosed is a hub assembly system that includes a hub and a rotary union body. Included with the rotary union body is a circumferential air channel, a seal channel and an intake air channel. Here the intake air channel is connected to the circumferential air channel.

A rotary transmission leadthrough is part of a tire pressure control system for a tire of a vehicle, the tire having a hub mounted in a rotatable manner on an axle, the rotary leadthrough having a stator unit mounted on the axle of the tire in such a manner that its position in the axial direction is adjustable relative to the axle. The stator unit has a disc like end member and a bearing member extending in the axial direction from the end member with a bearing surface on its outer radial surface, the end member projecting outwards in a radial direction from the bearing surface. The bearing member retains an inner bearing shell of a rolling bearing carrying the hub. A connector is mounted on the end member connected to an air supply of the tire pressure control system, and an air conduit connecting the connector with an air passage extending in the axial direction under the bearing surface. An opening in the bearing surface connects to the air passage with an air chamber arranged radially to the outside of the bearing surface. A rotor unit connects to the hub in a torque fit manner, and the rotary unit is arranged radially outside to the bearing member of the stator unit and has a connector in a radial outside position connected to the tire valve of a tire mounted on the hub. An air conduit connecting the connector with the air chamber is arranged between the rotary unit and the bearing member; and a sealing unit is arranged between the bearing surface of the stator unit and the rotary unit having at least two sealing rings held in place and arranged with a spacing between them in the axial direction, the spacing defining the air chamber.

A rotary joint assembly for a tire inflation system includes a rotating portion. The rotating portion is attached to a wheel rim for rotation therewith. The rotating portion includes a center portion which has an air passageway formed therein. The rotary joint assembly also includes a non-rotating portion. The non-rotating portion has a non-rotating portion air passageway formed therein. The non-rotating portion air passageway is in fluid communication with the air passageway formed in the rotating portion via a chamber. A pair of annular sealing members are attached to the rotating portion and sealingly contact a sealing surface of the non-rotating portion. The annular sealing members define an inboard end and an outboard end of the chamber.

An on-board centralized system for regulating pressure of tyres of a vehicle includes a pressurized air source, a circuit communicating the source with a plenum of each wheel, and an arrangement for connecting the plenum of each wheel to the inner chamber of the respective tyre that includes first and second connection lines for deflation and inflation, respectively, of the tyre, and first and second one-way valves interposed, respectively, in the first and second connection lines to allow only a flow of air respectively from and to the inner chamber. The first valve includes a spring having a pre-set load so as to isolate the inner chamber from a part of the circuit upstream of the first valve when said upstream part is at atmospheric pressure, and to guarantee a pre-set minimum value of pressure in the inner chamber when the upstream part is at a pressure lower than atmospheric pressure.

A tire inflation system is provided for a vehicle supported by a plurality of inflatable tires. The system includes a compressor, a main air storage tank and an auxiliary air storage tank. An automated shut off valve is disposed between the main air storage tank and the auxiliary air storage tank. An inflation sensor is arranged to detect an inflation pressure provided to the tires. A controller has a rapid inflation mode configured to initially communicate stored compressed air from both the main air storage tank and the auxiliary air storage tank to the tire or tires being inflated, and to then close the automated shut off valve so that additional compressed air from the compressor is communicated to the tire or tires being inflated without repressurizing the auxiliary air storage tank.

A tire deflation and inflation system for a vehicle. The system includes a unit bearing having a plurality of wheel flanges for mounting a wheel thereto. The unit bearing is configured to receive therein a portion of an axle of the vehicle. A wheel hub is mounted to the unit bearing. An air chamber is defined by the unit bearing. In response to positive air pressure generated by an air pressure source, air flows through the air chamber to a tire of the wheel mounted to the unit bearing to increase air pressure of the tire. In response to negative air pressure generated by venting the system to atmosphere, air is drawn out of the tire through the air chamber.

An axle assembly for a work vehicle includes: a frame housing; a differential housed in the frame housing; an axle carrier coupled to the frame housing; an axle partially disposed in the axle carrier and coupled to the differential; and a tire inflation pack including: a fixed portion coupled to the axle carrier and comprising a pack fluid inlet that is configured to fluidly couple to a pressurized gas source and a fixed opening holding the axle therein, the fixed portion being configured to allow rotation of the axle in the fixed opening without rotating; and a rotatable portion rotatably coupled to the fixed portion and comprising a pack fluid outlet that is fluidly coupled to the pack fluid inlet and a rotatable opening holding the axle therein, the rotatable portion being fluidly sealed with the fixed portion and configured to rotate with the axle.

An on-board centralized system for regulating pressure of tyres of a vehicle includes a pressurized air source, two pneumatic rotary joints each associated to a driving wheel of the vehicle, and a circuit that sets in communication the pressurized air source with each rotary joint. An output member of a constant-velocity joint and a wheel spindle have an internal duct for air passage, connected to the respective rotary joint and to a plenum of the respective driving wheel. Each non-driving wheel has its wheel spindle traversed by an axial bore for air passage, connected to the circuit via a pneumatic rotary joint and a plenum of the non-driving wheel, which is connected to the inner chamber of the tyre. Each driving or non-driving wheel has its plenum connected to the inner chamber via two parallel lines, for deflating and inflating, respectively, the tyre interposed in which are respective one-way valves.

A steer axle spindle may have one or more channels formed therein. A rotary union may be mounted to a steer axle wheel end assembly. The rotary union may be sealingly connected to a pressurized fluid source through the channel, and sealingly connected to a vehicle tire.

A utility vehicle having a chassis on which a tire inflation system is configured to be arranged, wherein the chassis has at least one axle with a cavity which is embodied as a compressed-gas reservoir in which a gas at a specified gas pressure is stored for inflating a tire of the utility vehicle with the gas, wherein the compressed-gas reservoir has a wall with a compressive strength of at least 0.9 N/mm2, preferably at least 1.4 N/mm2.