Patent ID: 9540973
Date: 2017-01-10
CPC Classifications: F01L,F01M,F02B

Claim:
1. An oil passage structure of a dry sump engine mounted on a vehicle in an inclined manner, comprising: an oil recovery passage that extends in a direction in which a cylinder bank extends 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 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 the vehicle in the inclined manner, the junction being located at a lowermost portion of the cylinder head; at least one first communicating hole 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 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.