Combustion chamber of an internal combustion engine

摘要

An internal combustion engine comprising a first raised portion formed on the inner wall of the cylinder head, a second raised portion formed on the top face of the piston at a position opposite to the first raised portion with respect to the axis of the piston, and a third raised portion formed on the inner wall of the cylinder head above the second raised portion. A first flat squish area is formed between the flat peripheral top face of the piston and the flat bottom face of the first raised portion. A second spherical shell shaped squish area is formed between the spherical bottom wall of the third raised portion and the spherical rear face of the second raised portion. The second raised portion has a front face which comprises a gently inclined front face portion and a steeply inclined front face portion. The gently inclined front face portion is arranged beneath the exhaust valve, and the steeply inclined front face portion is arranged beneath the intake valve.