A closed lubrication or hydraulic system that eliminates the traditional breather cap and includes (1) oxygen absorber that removes oxygen molecules and (2) a desiccant to dry the air that communicates with hydraulic fluid or lubricant in a reservoir. A metallic heat conduction rod is partially exposed to internal air and partly exposed to ambient air. The conduction rod is in close proximity to the oxygen absorber and desiccant in the cartridge. A cool portion on the conduction rod attracts hot humid internal air causing condensation of water near the surface of the conduction rod.

A closed lubrication or hydraulic system that eliminates the traditional breather cap and includes (1) oxygen absorber that removes oxygen molecules and (2) a desiccant to dry the air that communicates with hydraulic fluid or lubricant in a reservoir. A metallic heat conduction rod is partially exposed to internal air and partly exposed to ambient air. The conduction rod is in close proximity to the oxygen absorber and desiccant in the cartridge. A cool portion on the conduction rod attracts hot humid internal air causing condensation of water near the surface of the conduction rod.

A gas turbine engine comprises bearing(s). A structure supporting the bearing defines a bearing cavity surrounding the at least one bearing, an ambient chamber and an intermediate chamber having a portion between the bearing cavity and the ambient chamber, with at least one wall forming a passage from the bearing cavity to the ambient chamber and through the portion of the intermediate chamber. A tube is received in the passage and having a first end open to the bearing cavity and a second end open to the ambient chamber, the second end adapted to be connected to a conduit for fluid communication between the bearing cavity and the through the tube, wherein a portion of or near the first end of the tube is sealingly joined to the at least one wall, and the second end of the tube contacts the at least one wall and is free to move relative to the at least one wall.

A gas turbine engine comprises bearing(s). A structure supporting the bearing defines a bearing cavity surrounding the at least one bearing, an ambient chamber and an intermediate chamber having a portion between the bearing cavity and the ambient chamber, with at least one wall forming a passage from the bearing cavity to the ambient chamber and through the portion of the intermediate chamber. A tube is received in the passage and having a first end open to the bearing cavity and a second end open to the ambient chamber, the second end adapted to be connected to a conduit for fluid communication between the bearing cavity and the through the tube, wherein a portion of or near the first end of the tube is sealingly joined to the at least one wall, and the second end of the tube contacts the at least one wall and is free to move relative to the at least one wall.

An air bleeder includes a branch, a lubricant supply conduit, and a return conduit. Lubricant stored in a tank is to be supplied to a valve provided in a machine tool via the lubricant supply conduit. The lubricant supply conduit includes a first supply conduit, and a second supply conduit. The first supply conduit connects the branch and the tank. The second supply conduit connects the branch at a first connecting position and the valve. The return conduit connects the tank and the branch at a second connecting position higher than the first connecting position in a height direction along a height of the air bleeder to return lubricant to the tank and to remove air from lubricant in the lubricant supply conduit.

A hydraulic fluid de-aeration device for a hydraulically actuated variable valve actuation system is provided. The device includes a bridge and a de-aeration chamber having an upper chamber, a lower chamber, and a central axis. A vent pipe is arranged along the central axis of the de-aeration chamber and can include at least one vent hole. The bridge is arranged such that hydraulic fluid flowing from the bridge is directed towards an outer wall of a top portion of the lower chamber. The device includes a cover that integrates the upper chamber with a vent hole for air that is expelled from the hydraulic fluid. An optional gasket or plate configured with at least one vent hole can be arranged between the upper and lower chamber. The vent pipe can be arranged within the cover and extend through the upper chamber to the lower chamber.

A vehicle includes an engine, an oil circuit for providing oil to the engine, a fuel supply line, and an air-oil separating unit. The air-oil separating unit is configured to receive aerated oil from the engine via the oil circuit, flow the aerated oil in approximately a helical direction to de-aerate the oil, receive fuel from the fuel supply line, cool the aerated oil with the fuel while the aerated oil flows in the approximately helical direction, causing the fuel to heat, and pass the cooled and de-aerated oil and pass the heated fuel to the engine.

A lubrication circuit comprising an oil tank (4) integrated into a first lubricated chamber (5) comprises an evacuation conduit (20) on a recovery conduit (10) from lubricated chambers of the circuit leading to the reservoir (4), opening up into an outlet (21) when an excessive pressure in the tank, that is a symptom of progressive filling, is reached. Application to aircraft engine lubrication circuits, particularly to guard against fuel leaks in the lubricant as a result of a defective heat exchanger.

A lubrication circuit comprising an oil tank (4) integrated into a first lubricated chamber (5) comprises an evacuation conduit (20) on a recovery conduit (10) from lubricated chambers of the circuit leading to the reservoir (4), opening up into an outlet (21) when an excessive pressure in the tank, that is a symptom of progressive filling, is reached. Application to aircraft engine lubrication circuits, particularly to guard against fuel leaks in the lubricant as a result of a defective heat exchanger.

A return filter is provided in a tank, for removing bubbles from hydraulic oil before returning the hydraulic oil to the tank. A vortex forming portion that includes a spiral-shaped blade member is provided in an outflow portion that has a substantially cylindrical shape and communicates with a hollow portion of a filter element. Thus, a vortex forms in the hydraulic oil flowing through the outflow portion and bubbles contained in the hydraulic oil are collected.