[Problem to be Solved] To improve operability in detaching a sealing member. [Solution] A sealing structure 10 according to the present invention includes a main body 30a, a female thread part 20h fixed to the main body 30a, the female thread part 20h being screwed into a discharge hole 20c of a drain plug fastening part 20 by the main body 30a being rotated in a normal rotation direction, and an elastically deformable arm part 30c, one end of which is joined to the main body 30a. A concave part 20e is formed in the drain plug fastening part 20 and a claw part 30g is formed in the arm part 30c. When the main body 30a is rotated in the normal rotation direction, the arm part 30c is elastically deformed while a part of the arm part 30c slides on a top surface 20d of the drain plug fastening part 20 until the main body 30a is rotated to a predetermined rotational position and, when the main body 30a is rotated to the predetermined rotational position, the claw part 30g fits in the concave part 20e and the elastic deformation of the arm part 30c is released, whereby the rotation of the main body 30a from the predetermined rotational position is prevented. When the main body 30a is rotated in a reverse rotation direction from the predetermined rotational position, the claw part 30g slides on and climbs over a first wall part 20f of the concave part 20e while the arm part 30c is elastically deformed, whereby the prevention of the rotation of the main body 30a from the predetermined rotational position is released. The claw part 30g or the concave part 20e is formed such that, when the main body 30a is rotated in the reverse rotation direction and the claw part 30g is sliding on the first wall part 20f, an angle A formed by a direction of force applied to the arm part 30c from the drain plug fastening part 20 and a straight line connecting a contact part of the claw part 30g and the first wall part 20f and a rotation center of the main body 30a is smaller than 90 degrees when viewed in a rotation center direction of the main body 30a.

An agricultural vehicle transmission may comprise a housing comprising a bulkhead where the bulkhead may divide the housing into a sump and a reservoir. The bulkhead may comprise an opening configured to fluidly couple the sump and the reservoir. A plurality of transmission gears may be disposed in the reservoir of the housing. The opening in the bulkhead may balance the vehicle transmission system to remove excess oil in the sump and away from the plurality of transmission gears.

A housing for a drive system. The housing defines a motor cavity, an electronics cold plate, an oil cavity, and a coolant cavity. The coolant cavity defines a first coolant flow path configured to provide cooling to the motor cavity and the oil cavity. The coolant cavity defines a second flow path configured to provide cooling to the motor cavity and the cold plate. The housing defines a coolant inlet and a coolant outlet fluidically coupled to the first coolant flow path and the second coolant flow path, such that the first coolant flow path and the second coolant flow path are parallel fluid paths. In some applications the coolant paths can be connected in series. In some examples, the housing is configured to cause a counter-flow heat exchange between an oil flowing in the oil cavity and a coolant flowing in the first coolant flow path.

A lubrication system for an internal combustion engine of a work vehicle includes an engine oil sump and a pump unit fluidly connected to the engine oil sump to receive engine oil therefrom. The pump unit, in turn, includes a first oil pump comprising a variable displacement pump, a second oil pump, a drive line mechanically coupled to the first oil pump and the second oil pump that drives each of the pumps, and a manifold that directs engine oil from the engine oil sump to the first and second oil pumps. A first oil circuit is fluidly coupled to the first oil pump to direct a first flow of engine oil to piston spray jets in the engine and a second oil circuit is fluidly coupled to the second oil pump to direct a second flow of engine oil to one or more oiled engine components in the engine.

A hybrid propulsion system includes a heat engine configured to drive a heat engine shaft. An electric motor configured to drive a motor shaft. A transmission system is connected to receive rotational input power from each of the heat engine shaft and the motor shaft and to convert the rotation input power to output power. A first lubrication/coolant system is connected for circulating a first lubricant/coolant fluid through the heat engine. A second lubricant/coolant system in fluid isolation from the first lubrication/coolant system is connected for circulating a second lubricant/coolant fluid through the electric motor.

A quantitative one-way oil gas lubricant system and a method for a 4-stroke engine, including a preceding stage quantitative oil intake orifice that is connected to a lubricant case on a wall of a crankcase of the 4-stroke engine, and a final stage quantitative airflow orifice disposed at a cylinder cover of the 4-stroke engine, are provided. A diameter of the preceding stage quantitative oil intake orifice D.sub.1 and a diameter of the final stage quantitative airflow orifice satisfy an equation: D.sub.1/D.sub.3=0.8-1.5, wherein a one-way connected oil gas lubricant channel is disposed between the preceding stage quantitative oil intake orifice and the final stage quantitative airflow orifice. A lubricant oil sucked from the preceding quantitative oil intake orifice by the crankcase flows along the oil gas lubricant channel and lubricates the engine parts that the channel passes through in turns. Finally, a minute quantity of waste oil gas that flows out from the final stage quantitative airflow orifice is introduced into a cylinder of the 4-stroke engine and is to be burned completely. The supply quantity of the lubricant oil may be controlled, and no extra lubricant oil gas may flow out from the final stage quantitative airflow orifice, therefore, the quantitative and one-way lubricating is realized.

An engine assembly includes a small air-cooled engine and a dry sump lubrication system including an external oil reservoir, wherein the dry sump lubrication system has an overall oil capacity that provides at least five hundred hours of engine oil life.

An engine assembly includes a small air-cooled engine and a dry sump lubrication system including an external oil reservoir, wherein the dry sump lubrication system has an overall oil capacity that provides at least five hundred hours of engine oil life.

An oil tank filling system for filling the oil tank of a gas turbine engine that includes an aft core cowl. The system includes an oil tank that has an oil tank top and an oil tank bottom and is located within a core of the engine, an oil access port located on the aft core cowl, and an oil tank filling pipe that leads from the oil access port to a tank filling port located at or adjacent the oil tank bottom. The system is configured so that oil that is supplied to the oil access port flows to and into the oil tank using gravitational force. A method of filling the oil tank of a gas turbine engine and a gas turbine engine that includes the oil tank filling system.

A hybrid propulsion system includes a heat engine configured to drive a heat engine shaft. An electric motor configured to drive a motor shaft. A transmission system is connected to receive rotational input power from each of the heat engine shaft and the motor shaft and to convert the rotation input power to output power. A first lubrication/coolant system is connected for circulating a first lubricant/coolant fluid through the heat engine. A second lubricant/coolant system in fluid isolation from the first lubrication/coolant system is connected for circulating a second lubricant/coolant fluid through the electric motor.