Oil passage structure of dry sump engine and oil passage structure of V-shaped dry sump engine

An oil passage structure of a V-shaped dry sump engine including left and right cylinder banks extending in front and rear directions of a vehicle, comprising:

• an oil recovery passage that extends in the front and rear direction of the vehicle and is disposed so that at least part of the oil recovery passage is located outward of an external lower end portion of a valve gear chamber of a cylinder head of each of the left and right cylinder banks along a junction between a side wall portion of the cylinder head and a bottom surface of the valve gear chamber in a state where the V-shaped dry sump engine is mounted on the vehicle, the junction being located at a lowermost portion of the cylinder head;
• a plurality of first communicating holes formed in the side wall portion so as to connect the valve gear chamber of the cylinder head and the oil recovery passage together;
• and
• a first oil suction passage that connects the oil recovery passage and a first oil suction device together,
• wherein oil in the valve gear chamber of the cylinder head is sucked by the first oil suction device into an oil reservoir through the plurality of first communicating holes, the oil recovery passage, and the first oil suction passage such that oil exits the valve gear chamber of each of the left and right cylinder banks by first passing through one of the plurality of first communicating holes, subsequently entering the oil recovery passage, and then entering the first oil suction passage before exiting the cylinder head.

An oil passage structure of a dry sump engine, comprising:

• an oil recovery passage extending in a direction in which a cylinder bank extends and disposed so that at least part of the oil recovery passage is located outward of an external lower end portion of a valve gear chamber of a cylinder head along a junction between a side wall portion of the cylinder head and a bottom surface of the valve gear chamber in a state where the dry sump engine is mounted on a vehicle in an inclined manner, the junction being located at a lowermost portion of the cylinder head;
• at least one first communicating hole provided in the side wall portion so as to connect the valve gear chamber of the cylinder head and the oil recovery passage;
• and
• a first oil suction passage connecting the oil recovery passage and a first oil suction device, oil in the valve gear chamber of the cylinder head being to be sucked by the first oil suction device into an oil reservoir through the at least one first communicating hole, the oil recovery passage, and the first oil suction passage such that oil exits the valve gear chamber by first passing through the at least one first communicating hole, subsequently entering the oil recovery passage, and then entering the first oil suction passage before exiting the cylinder head.

An oil passage structure of a V-shaped dry sump engine including left and right cylinder banks, comprising:

• an oil recovery passage extending in a front and rear direction of a vehicle and disposed so that at least part of the oil recovery passage is located outward of an external lower end portion of a valve gear chamber of a cylinder head of each of the left and right cylinder banks along a junction between a side wall portion of the cylinder head and a bottom surface of the valve gear chamber in a state where the V-shaped dry sump engine is mounted on the vehicle, the left and right cylinder banks extending in the front and rear direction of the vehicle, the junction being located at a lowermost portion of the cylinder head;
• a plurality of first communicating holes provided in the side wall portion so as to connect the valve gear chamber of the cylinder head and the oil recovery passage;
• and
• a first oil suction passage connecting the oil recovery passage and a first oil suction device, oil in the valve gear chamber of the cylinder head being to be sucked by the first oil suction device into an oil reservoir through the plurality of first communicating holes, the oil recovery passage, and the first oil suction passage such that oil exits the valve gear chamber of each of the left and right cylinder banks by first passing through one of the plurality of first communicating holes, subsequently entering the oil recovery passage, and then entering the first oil suction passage before exiting the cylinder head.