Oil circulation structure in internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorTsutomu WAKIYA
Life of this patent
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Abstract
An oil circulation structure in an internal combustion engine, the oil circulation structure includes a cylinder block and a cylinder head. The cylinder head includes a plurality of exhaust ports. The cylinder head has a plurality of oil holes opened on a surface making contact with the cylinder block. Oil is supplied to the cylinder block through the plurality of oil holes. The plurality of oil holes includes a first oil hole and a second oil hole. The first oil hole is placed further outside an outermost exhaust port in a longitudinal direction of the cylinder block. The second oil hole is placed further outside the first oil hole in the longitudinal direction of the cylinder block, and the second oil hole has a diameter larger than a diameter of the first oil hole.
Claims4
An oil circulation structure in an internal combustion engine, the oil circulation structure comprising:
- a cylinder block;
- and
- a cylinder head including a plurality of exhaust ports, the cylinder head having a plurality of oil holes opened on a surface making contact with the cylinder block, oil being supplied to the cylinder block through the plurality of oil holes, the plurality of oil holes including a first oil hole and a second oil hole, the first oil hole being placed outside an outermost exhaust port in a longitudinal direction of the cylinder block, the second oil hole being placed outside the first oil hole in the longitudinal direction of the cylinder block, and the second oil hole having a diameter larger than a diameter of the first oil hole.
Dependencies are inferred from the claim text.