Reciprocating internal combustion engine

摘要

The piston rings (11-12) have at least a virtually rectangular cross-section. Ring spaces (25,26) are arranged between two adjacent piston rings. Recesses (16,17,20) are formed in at least two ring grooves. They connect the base (18,21) of the ring groove with one of the adjoining ring spaces. At least one hole (22) joins the base of a ring groove (10) remote from the combustion chamber with the inner space (24) of the piston. The recesses are arranged in the ring grooves (9) remote from the combustion chamber. The piston ring is inserted in the ring groove (8) close to the combustion chamber with an axial clearance between 50 and 120 micrometres (dA).