The power transmission apparatus includes: a gear chamber, used for accommodating gears disposed on a rotating shaft used for transmitting power to a drive wheel; a clutch chamber, disposed adjacent to the gear chamber in an axial direction of the rotating shaft, and used for accommodating a clutch used for disconnecting or connecting the power transmitted by the rotating shaft to the drive wheel; and a communicating hole, used for communicating the clutch chamber with the gear chamber, where an inclined surface facing toward the communicating hole is provided on an inner surface inside the clutch chamber opposite to an outer peripheral surface of the clutch.

A vehicle axle includes a housing, differential gearing, and a first clutch. The housing defines first and second cavities. The housing also defines a channel extending between the first and second cavities. The differential gearing is disposed within the first cavity and has a carrier extending into the second cavity. The first clutch is disposed within the second cavity. The first clutch is configured to selectively couple a half-shaft to the carrier. The first clutch has friction plates that include fanned spokes positioned to draw fluid from the channel and into the second cavity.

An axle assembly having a differential carrier that includes a bearing support wall that at least partially defines a first lubricant chamber. A rotor output flange that is fixedly coupled to a rotor may at least partially defines a second lubricant chamber. At least one seal may separate the first lubricant chamber from the second lubricant chamber.

Various implementations described herein are directed to an emergency lubrication system for an aircraft. The emergency lubrication system includes a lubrication chamber, a bladder, a gearbox, and a valve. The bladder is coupled to the lubrication chamber and includes one or more chemicals that pressurize the lubrication in the lubrication chamber when activated. The valve is coupled between the lubrication chamber and the gearbox and provides the lubrication to one or more components within the gearbox.

A transfer structure for a vehicle which retains a stable amount of lubricant in a coupling chamber and maintains a cooling effect for a coupling by agitation of the lubricant irrespective of an inclination of a vehicle in a front-rear direction. The transfer structure includes a gear chamber housing first and second gears meshing with each other; a coupling chamber housing a coupling provided coaxially with the first gear; an introduction path which introduces a lubricant in the gear chamber into the coupling chamber; and a return path through which the lubricant in the coupling chamber is returned to the gear chamber. The return path is inclined downward toward the gear chamber from an opening that opens in a lower part of an intermediate part of the coupling chamber in a vehicle front-rear direction to an oil discharge hole that opens in the gear chamber.

A Lubrication system for an engine component of a gas turbine engine, such as a planetary gearbox. The system comprises a main lubrication system comprising a main tank configured to supply lubricant to the engine component, and a main reservoir configured to collect lubricant scavenged from the engine component after lubrication; and an auxiliary lubrication system comprising an auxiliary reservoir configured to collect lubricant scavenged from the engine component after lubrication and to supply scavenged lubricant to the engine component. Main reservoir comprises an interior and the auxiliary reservoir is located within the interior of the main reservoir. The auxiliary reservoir comprises an upper portion, a lower portion and a lubricant pickup region, the upper portion comprising an opening arranged to permit lubricant to overflow into the main reservoir, and the lower portion of the auxiliary reservoir being shaped to cause lubricant to drain towards the lubricant pickup region.

In some examples, an aircraft gearbox comprises a housing, a barrier, a rotatable drive system component, a set of gears, and a lubrication system. The barrier separates a first compartment and a second compartment within the housing. Each of the rotatable drive system component and the set of gears operable to rotate based on torque received from an engine. The rotatable drive system component is located in the first compartment. The set of gears is located in the second compartment. The lubrication system comprises a first lubrication subsystem and a second lubrication subsystem, which are, at least in part, independent from one another. The first lubrication subsystem is operable to lubricate the rotatable drive system component in the first compartment. The second lubrication subsystem is operable to lubricate the set of gears in the second compartment. The barrier inhibits lubricant from passing between the first compartment and the second compartment.

A drive assembly includes a housing, upper and lower shafts, a friction pack, and a pair of meshed gears. The housing defines a receptacle containing a volume of lubricating fluid, a brake chamber with a metering orifice in a lower portion of the brake chamber, and an exit port at an upper portion of the brake chamber. The upper and lower shafts are within the housing at different elevations and configured for rotation. The friction pack is within the brake chamber and driven to rotate by the upper shaft. The pair of meshed gears is driven to rotate by one or more of the upper and lower shafts, and the gears communicate lubricating fluid from the receptacle to the lower portion of the brake chamber through the metering orifice. Rotation of the friction pack pumps lubricating fluid to the exit port at the upper portion of the brake chamber.

A transfer gearbox device, comprising a differential gear with a crown wheel in a first oil chamber, and a friction clutch in a second oil chamber. The first oil chamber comprises a first oil sump and the second oil chamber comprises a second oil sump. A valve is between the first oil chamber and the second oil chamber. When the valve is open, oil can pass via the valve out of the first oil chamber into the second oil chamber. When the valve is closed, oil cannot pass via the valve out of the first oil chamber. When the valve is open, by rotating the crown wheel, oil is conveyed by the crown wheel from the first oil sump into a first oil collector and is guided therefrom via a first oil guide and via the valve to the friction clutch cool and/or to lubricate the friction clutch.

A drive system for a tiltrotor aircraft operable to transition between rotary and non rotary flight modes. The drive system includes an engine to provide rotational energy and a proprotor assembly to receive rotational energy from the engine when the tiltrotor aircraft is in the rotary flight mode. The proprotor assembly is disengaged from the engine in the non rotary flight mode. The drive system includes a proprotor gearbox including one or more gears mechanically interposed between the engine and the proprotor assembly. The proprotor gearbox transfers rotational energy from the engine to the proprotor assembly when the tiltrotor aircraft is in the rotary flight mode. The drive system includes a lubricant operable to reduce friction between the gears and a lubrication management system to affect a temperature of the lubricant to enhance lubrication between the gears in the proprotor gearbox in the rotary flight mode.