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.

Rotor with breather and anti-rotation arrangement for tire calibration arrangements that provides a suitable breather of the axle hub, and, in turn, an improved oil retention thus preventing the premature wear of internal pieces and possible accidents during its operation.

Disclosed herein are devices and systems for continuous control of tire pressure. In one aspect, a device for continuously controlling tire pressure includes a bracket, a fixed non-rotating member fixedly attached to the bracket, and a non-fixed rotating member rotatably attached thereto. The fixed non-rotating member has at least one first seal surface, the at least one seal surface configured to be in fluid communication with a compressed air source. The non-fixed rotating member has at least one second seal surface, wherein an air chamber defined within a volume between interacting the at least one first seal surface and the at least one second seal surface causes fluid communication between an interior space of the tire and the compressed air source.

A rotary pneumatic seal may have a ring-shaped inner radial seal with an inner lip extending in an axial direction, an outer lip extending in the same axial direction, a connecting flange connecting the inner lip and the outer lip, a pneumatic sealing lip, and an oil sealing lip. The rotary pneumatic seal may also have a ring-shaped outer radial seal located radially outward from the inner radial seal. The outer radial seal may also have a first wall extending in an outward radial direction, a second wall extending in an opposite inward radial direction, a central flange connecting the first and second walls, and a dust lip.

A rotary union for a tire inflation system of a heavy-duty vehicle that includes energy harvesting structure for generating electricity to power electronic components of the heavy-duty vehicle. The energy harvesting structure is integrated with and protected by the rotary union. The energy harvesting structure includes components that are attached to respective static and rotatable components of the rotary union that generate electricity for powering the electronic components during rotational movement of the rotatable components relative to the static components during operation of the heavy-duty vehicle. The components of the energy harvesting structure can be entirely removed or separated and sealed from a flow path of pressurized air through the rotary union.

A method for detecting a leak in a pressure vessel of a system including a plurality of pressure vessels in fluid communication with a common header comprises: reducing a fluid pressure in the common header to a first predetermined value below an operating pressure of the plurality of pressure vessels; gradually adding fluid to the common header at a first flow rate to increase the fluid pressure in the common header from the first predetermined value; monitoring, after gradually adding the fluid to the common header, the fluid pressure in the common header; and determining, based on the fluid pressure in the common header after gradually adding the fluid to the common header, a leak in at least one pressure vessel of the plurality of pressure vessels.

A rotary transmission device for transmitting control and/or working pressures to a wheel hub. The rotary transmission device has a housing structure in which a piston element is displaceable between a first and a second position relative to the housing structure and relative to a running body of the wheel hub which is mounted so as to rotate relative to the housing structure. To transmit the control and/or working pressures, at least one pressure medium channel is formed in the piston element. In the first position, an air gap is present between an end face of the piston element on the running body side and an end face of the running body on the piston element side, while in the second position, no air gap is present, and the at least one pressure medium channel opens in sealed fashion into at least one pressure medium channel formed in the running body.

The invention relates to a rotary transmission apparatus (1) for the transmission of control and/or working pressures to a fluid duct (51) which is received or configured at least in regions in the interior of a shaft (50), in particular a drive shaft. The rotary transmission apparatus (1) has a stator assembly (2) which is arranged in a stationary manner with respect to a rotational movement of the shaft (50) and has at least one fluid feed/discharge line (3) and a control element (4) which can be displaced in the shaft longitudinal direction (L) relative to the shaft (50) between a first position and a second position. A flow connection between the at least one fluid feed/discharge line (3) and the fluid duct (51) is interrupted in the first position of the control element (4), and a flow connection between the at least one fluid feed/discharge line (3) and the fluid duct (51) is established in the second position of the control element (4).

A wheel end assembly for a tire pressure management system including an axle having an axle end portion and a rotary joint assembly disposed outboard of the axle end portion. The rotary joint has a rotary hub, a non-rotating tube spindle at least partially disposed within the rotary hub, the tube spindle having a tube spindle hollow central chamber, an air seal provided between the rotary hub and the tube spindle, and a bearing assembly provided between the rotary hub and the tube spindle. The bearing assembly is positioned outboard of the air seal.

Disclosed herein are devices and systems for continuous control of tire pressure. In one aspect, a device for continuously controlling tire pressure includes a bracket, a fixed non-rotating member fixedly attached to the bracket, and a non-fixed rotating member rotatably attached thereto. The fixed non-rotating member has at least one first seal surface, the at least one seal surface configured to be in fluid communication with a compressed air source. The non-fixed rotating member has at least one second seal surface, wherein an air chamber defined within a volume between interacting the at least one first seal surface and the at least one second seal surface causes fluid communication between an interior space of the tire and the compressed air source.