An engine assembly is provided. The engine assembly comprises an oil system comprising: a first oil pump configured to supply oil at a first pressure to one or more first components of the engine assembly; and a second oil pump configured to supply oil at a second pressure to one or more second components of the engine assembly, the second pressure being higher than the first pressure; wherein the second oil pump is provided adjacent to a valve train of the engine assembly.

Side surfaces of an end cam cap and a pair of side surfaces of a recess for cam cap form two cross-sectional area gradually changing gaps therebetween. A gasket is filled between an inner surface of the recess for cam cap and an outer surface of the end cam cap. The inner surface includes the side surfaces of the recess for cam cap and the outer surface includes the side surfaces of the end cam cap.

An oil supply system of a vehicle includes: a first pump generating a first quantity of oil to cool a driving motor of a hybrid vehicle; a second pump generating a second quantity of oil to lubricate a friction lubrication element of the hybrid vehicle; a flow channel switching valve selectively switching a flow channel of the first quantity of oil and a flow channel of the second quantity of oil to connect the flow channel of the first quantity of oil to the friction lubrication element or connect the flow channel of the second quantity of oil to the driving motor; and a controller controlling an operation of the flow channel switching valve to supply a portion of the first quantity of oil to the friction lubrication element or a portion of the second quantity of oil to the driving motor.

A four-stroke engine includes an oil tank, a crankshaft chamber, a distribution chamber, a rocker chamber, a combustion chamber, and a lubricating system. The oil tank is communicated with the crankshaft chamber through an oil supply channel. The four-stroke engine further comprises a cam and a transmission mechanism connected between the cam and a crankshaft of the crankshaft chamber in a matched manner. The cam is matched with a rocker of the rocker chamber and located above the combustion chamber.

A four-stroke engine includes an oil tank, a crankshaft chamber, a distribution chamber, a rocker chamber, a combustion chamber, and a lubricating system. The oil tank is communicated with the crankshaft chamber through an oil supply channel. The four-stroke engine further comprises a cam and a transmission mechanism connected between the cam and a crankshaft of the crankshaft chamber in a matched manner. The cam is matched with a rocker of the rocker chamber and located above the combustion chamber.

An internal combustion engine oil utilization system, comprising one or more oil pumps to receive and discharge engine oil including an engine oil circulation loop comprising a first flow path and a second flow path. The first flow path receives at least a portion of the oil discharged from the one or more oil pumps and utilizes the oil to lubricate the engine during running operation of the engine. The second flow path receives at least a portion of the oil discharged from the one or more oil pumps and accumulates the oil to start the engine and/or to lubricate the engine during at least one of a pre-starting operation and a starting operation of the engine.

An internal combustion engine oil utilization system, comprising one or more oil pumps to receive and discharge engine oil including an engine oil circulation loop comprising a first flow path and a second flow path. The first flow path receives at least a portion of the oil discharged from the one or more oil pumps and utilizes the oil to lubricate the engine during running operation of the engine. The second flow path receives at least a portion of the oil discharged from the one or more oil pumps and accumulates the oil to start the engine and/or to lubricate the engine during at least one of a pre-starting operation and a starting operation of the engine.

A cooling and lubrication system for a motor vehicle drive unit includes a drive unit sump, a first mechanically-driven pump, a second mechanically-driven pump, and an oil/air separator reservoir, among other possible components. The drive unit sump holds drive unit fluid. The first mechanically-driven pump fluidly communicates with the drive unit sump, and the second mechanically-driven pump fluidly communicates with the drive unit sump. The oil/air separator reservoir resides downstream of the first mechanically-driven pump and resides downstream of the second mechanically-driven pump.

A gearbox for a motor vehicle. The gearbox comprises at least one fluid supply system. The fluid supply system comprises at least one pump. The fluid supply system comprises at least one fluid sump. The fluid supply system comprises at least one fluid reservoir. The fluid reservoir comprises at least a first fluid outflow leading into the fluid sump. The first fluid outflow can be controlled as a function of a state variable.

In at least one implementation, an engine oil circuit for a vehicle includes first and second oil circuits, and first and second oil pumps. The first oil circuit is communicated with at least one first engine component and the first oil pump is communicated with the first oil circuit to supply fluid flow in the first oil circuit at a first flow rate and a first pressure. The second oil circuit is communicated with at least one second engine component and may be segregated from the first oil circuit. The second oil pump is communicated with the second oil circuit to supply fluid flow in the second oil circuit at a second flow rate and a second pressure. At least one of the second flow rate or the second pressure is different than the first flow rate or the first pressure.