The invention describes an internal combustion engine having at least one crankcase, at least one cylinder head, at least one cylinder head cover, at least one oil separator and at least one oil pan for collecting returning oil as well as having at least one oil return channel that connects the oil separator and the oil pan.

An internal combustion engine including a crank chamber housing a crankshaft connected to moving parts able to supply torque to the crankshaft, a lubrication circuit, an oil sump for collecting the lubricating oil, the engine including a separating partition which separates the crank chamber from the oil sump, in which the lubrication circuit includes a first oil pump and a second oil pump, where the first oil pump is fluidically connected in aspiration to the crank chamber and in delivery to the oil sump, the second oil pump being fluidly connected in aspiration to the oil sump and in delivery to the crank chamber by means of the lubrication circuit, to re-introduce pressurised oil in the crank chamber and lubricate the moving parts.

The invention relates to a cylinder head oil separator arranged in a cylinder head of an internal combustion engine. In order to reduce maintenance and simplify the oil separator, the cylinder head oil separator includes a flow channel which is constructed as a Tesla valve and which is designed such that the air-oil aerosol flows through a longer flow path in a first flow direction from the aerosol inlet at a first opening to the air outlet (separation direction) at a second opening. The air-oil aerosol flows through a shorter flow path in a ventilation direction opposite the separation direction from the inlet at the second opening to the outlet of a fluid at the first opening.

An internal combustion engine having a crankcase with a base and an oil tank, wherein a first connection between the crankcase and the oil tank is formed with a first valve, which is open in the direction from the crankcase to the oil tank and closed in the opposite direction, and a second connection between the crankcase and the oil tank is formed with a second valve, which is open in the direction from the oil tank to the crankcase and is closed in the opposite direction. The first valve is arranged on the base of the crankcase and the second valve is arranged above the first valve.

An internal combustion engine is provided with oil intake pipes defining oil inlets on both sides of a tunnel type sump. Each oil intake pipe includes a valve which is operable to close the respective flowpath when the respective sump portion is tilted upwardly about the length axis of the engine. The inlets may be arranged to remain submerged in a minimum quantity of oil which is retained in each sump portion while the engine is tilted through its maximum angular range about both length and width axes.

An oil filter exposed to an outside of an internal combustion engine that may be damaged by a stone or a similar object thrown rearwardly from a front tire. A saddle-ride type vehicle includes a power unit that includes an internal combustion engine and a transmission. The transmission is coupled to the internal combustion engine. A lower portion of the power unit forms an oil reservoir. The power unit includes an oil filter, an actuator, and a transmission mechanism. The actuator is configured to drive the transmission. The transmission mechanism is configured to transmit power from the actuator to the transmission. The oil filter is disposed outside a wall portion of the power unit. The wall portion configures a part of the oil reservoir. The oil filter is disposed adjacent to the wall portion and the actuator.

Methods and systems are provided for an oil supply unit with a collecting vessel for collecting oil. In one example, a method may include maintaining a pressure of the collecting vessel during an engine off, wherein maintaining the pressure may further include maintain a temperature of the oil in the collecting vessel.

A drain tube device that includes a first tubular region, a second region and arcuate tubular region interposed between the first tubular region and the second region. In certain embodiments, the arcuate region is contiguously joined to the first tubular and the second region such that the first tubular region and the second region form an acute angle in a first plane that is between 45° and 90°. The second region has an end distal to the arcuate tubular region and includes a longitudinal opening defined in at least a portion of the region between the arcuate tubular region and the distal end. In certain embodiments, the arcuate region can also have a configuration that provides an angle located out of the first plane between the first tubular region and the second region that is between zero and 90°.

An oil sump assembly comprises an oil sump including a first sidewall and a bottom wall for containing oil and an oil filter connected to a bottom portion of the first sidewall of the oil sump. The first sidewall includes a drain hole at the bottom portion and at least a portion of the bottom wall of the oil sump includes a slanted portion sloped towards a bottom of the first sidewall. An oil inlet and an oil outlet of the oil filter face the first sidewall of the oil sump.

An oil supply system for supplying oil to a lubricating cavity of a gas turbine engine, the oil supply system has: a de-oiler having a de-oiler air-oil inlet, a de-oiler oil outlet hydraulically connected to the lubricating cavity, and a de-oiler air outlet in fluid flow communication with an environment outside of the oil supply system; and a closed-loop oil circuit including a main pump having a main pump inlet and a main pump outlet, the main pump outlet hydraulically connected to the lubricating cavity, a de-aerator having a de-aerator inlet hydraulically connected to a scavenge outlet of the lubricating cavity, a de-aerator air-oil outlet in fluid flow communication with the de-oiler inlet, and a de-aerator oil outlet hydraulically connected to the main pump inlet.