INTERNAL COMBUSTION ENGINE

摘要

An internal combustion engine equipped with: a cylinder block in the interior of which pistons are arranged; a cylinder head containing recessed parts; cylinder liners affixed to the surfaces of hole parts of the cylinder block; and a variable compression ratio mechanism that changes the mechanical compression ratio. The variable compression ratio mechanism is formed such that the size of the combustion chamber can be changed by moving the cylinder head relative to the cylinder block. The cylinder liners extend such that the end parts facing the cylinder head are arranged within the recessed parts of the cylinder head within the range of relative movement of the cylinder head with respect to the cylinder block.

主权项

1. An internal combustion engine comprising:
a cylinder block which has a hole inside of which a piston is arranged; a cylinder head which includes a recess which has a top surface of a combustion chamber; a cylinder liner which is fastened at a surface of the hole of the cylinder block and which the piston contacts; and a variable compression ratio mechanism which changes a mechanical compression ratio; wherein the variable compression ratio mechanism is formed so that the cylinder head is moved relative to the cylinder block whereby the combustion chamber is variably formed in size, the cylinder liner extends so that, in the range where the cylinder head moves relative to the cylinder block, an end part facing the cylinder head is arranged inside of the recess of the cylinder head, and the end part of the cylinder liner at the side facing the cylinder head becomes gradually thinner toward a front end and has cross-sectional shape which is slanted from the front end toward the inside of the combustion chamber to form tapered shape.