A power transmission device that is mounted on a vehicle and provided with a transmission having a plurality of engagement elements for transmitting power from a motor to an axle, a case that accommodates the transmission, and a hydraulic control device that controls hydraulic pressure to the plurality of engagement elements.

An axle assembly having a differential gear set is provided. The axle assembly includes a housing having an interior portion sized to receive the differential gear set. At least one axle tube extends from a side of the housing. At least one axle is coupled to the differential gear set and extending through the at least one axle tube. A lubrication control member is coupled between the axle and the housing, the lubrication control member having at least one orifice, the orifice defining a lubrication flow path between the interior portion and the at least axle tube.

A hydraulic control apparatus for a vehicle including a first flow path leading oil discharged from a first hydraulic pump to a driving unit, a second flow path leading oil discharged from a second hydraulic pump to a lubrication unit, a flow path switching unit switching a flow path, and a controller controlling the flow path switching unit so as to lead the oil discharged from the second hydraulic pump to the first flow path when inoperation of an accelerator is detected and vehicle speed less than or equal to a predetermined value which is greater than 0 is detected, and to lead the oil discharged from the second hydraulic pump to the lubrication unit when operation of the accelerator is detected or vehicle speed greater than the predetermined value is detected.

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.

A transmission (G) for a motor vehicle includes a pump (P), an oil sump (S), a hydraulic control unit (HCU), a gear set (RS) for providing different transmission ratios between an input shaft (GW1) and an output shaft (GW2) of the transmission (G), and a cavity (HY) arranged on an input side, in which a torque converter (TC) and/or an electric machine (EM) are accommodated. The cavity (HY) is connected to the oil sump (S) via a gap (C) configured for a passive return of oil out of the cavity (HY) into the oil sump (S). In order to reduce the gap (C), a separating element (T) is configured for making it difficult for oil to flow out of the oil sump (S) to the cavity (HY). A drive train comprising such a transmission (G) is also provided.

An electric drive unit with an electric motor, a differential assembly, a transmission that transmits rotary power from the electric motor to the differential assembly, and a pair of output shafts that are rotatably coupled to respective differential output members of the differential assembly. The electric drive unit is configured to provide low cost, reliable cooling and/or lubrication to various components of the electric drive unit.

Various implementations described herein are directed to a lubrication system for a gearbox of an aircraft. A lubrication line is coupled to a plurality of jets and/or orifices to provide lubrication to one or more components of the gearbox. A check valve is placed within the lubrication line in a location upstream from the plurality of jets and/or orifices.

An automatic transmission has an oil pump driven by a travelling driving source. An air vent structure that expels air bubbles contained in automatic transmission fluid during pump operation has an air vent hole whose one end communicates with an outlet port of the oil pump and whose other end opens toward the oil pan. An air vent tube is connected to an opening end of the air vent hole. The air vent tube is extended up to a strainer lower side gap area located between a strainer and the oil pan, and a tube opening end of the air vent tube is placed in oil of the automatic transmission fluid.

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 fluid sump for accommodating a lubricating fluid and transmission housing for a vehicle comprising such a fluid sump. The fluid sump may comprise a first compartment for collecting the lubricating fluid, a second compartment in which the lubricating fluid can be brought in contact with a rotating member, and an intermediate compartment having a first opening for introducing the lubricating fluid from the first compartment into the intermediate compartment, a second opening for introducing the lubricating fluid from the intermediate compartment into the second compartment, and a floating element. In one or more examples, the first opening can be opened and closed by the floating element, and the first compartment, the intermediate compartment and the second compartment are provided with ambient pressure.