A battery cooling system includes: a circulation circuit configured to circulate common oil to a transaxle, a battery, and an oil cooler; a first electric oil pump that is disposed in a first oil passage; a second electric oil pump that is disposed in a second oil passage; and a controller configured to control the first electric oil pump and the second electric oil pump. The controller is configured to operate the first electric oil pump and stop the second electric oil pump when a temperature of the battery is equal to or lower than a first predetermined value, and stop the first electric oil pump and operate the second electric oil pump when the temperature of the battery is higher than the first predetermined value.

The present invention concerns a friction piece (10) suitable for operating in a lubricated medium at a temperature higher than 200 C. The piece (10) comprises a metal surface (12) and an external coating (14) composed of tungsten carbide doped with nitrogen WC(N) with an atomic ratio of nitrogen between 5 and 12%. The invention also relates to a mechanical system (1) comprising such a piece (10). The invention also relates to a method for implementing such a piece (10).

The present invention concerns a friction piece (10) suitable for operating in a lubricated medium at a temperature higher than 200 C. The piece (10) comprises a metal surface (12) and an external coating (14) composed of tungsten carbide doped with nitrogen WC(N) with an atomic ratio of nitrogen between 5 and 12%. The invention also relates to a mechanical system (1) comprising such a piece (10). The invention also relates to a method for implementing such a piece (10).

A tank assembly (100) for a gas turbine engine is provided comprising a tank (102) and a plurality of restraints (112, 114). The restraints (112, 114) include a fixing part (124) for securing the tank (102) to a support structure (104). A first restraint (112) has a first rigidity in the direction of a length of the tank (102) and at least one second restraint (114) has a second rigidity in the direction of the length of the tank (102). Upon thermal expansion or contraction of the tank (102) relative to the support structure (104), the or each second restraint (114) flexes to a greater extent than the first restraint (112).

A bearing assembly for an engine is disclosed. The bearing assembly includes a first structure, a second structure that is movable relative to the first structure, and a foil membrane disposed between the first structure and the second structure. The foil membrane includes at least one perforation that supplies liquid fuel in a region between the foil membrane and the second structure, where the liquid fuel is combusted by the engine.

A lubricating system includes a machine configured to operate in a first operating state and a second operating state; and a heat activated polymer material applied to at least a part of the machine and to remain solid during the first operating state and to soften upon being heated in the second operating state to lubricate the machine. The heat activated polymer material may soften due to increased friction incurred by the machine in the second operating state. A heating element may be operatively connected to any of the machine and the heat activated polymer material. The heat activated polymer material may soften due to being heated by the heating element in the second operating state. An injector may apply the heat activated polymer material to the machine. A channel may direct a flow of the heat activated polymer material as it softens in the second operating state.