The piston in the cylinder of the cylinder block moves reciprocally by the pressure received when the air-fuel mixture combusts.
The piston ring consists of the compression ring (top ring, second ring) and the oil ring, and has the following functions.
The compression ring prevents leakage of pressure in the cylinder from the piston circumference.
The oil ring clears off extra engine oil adhered to the cylinder wall.
The piston ring transmits piston heat to the cylinder wall to cool the piston.
The reciprocating movement of the piston is transmitted to the connecting rod by the connection of the piston pin to connecting rod.
A barrel-face ring for the top ring and a taper under cut ring for the second ring have been adopted.
A three-piece oil ring consisting of a side rail and spacer have been adopted for the oil ring.
Tracking capability to the cylinder wall has been improved by thinning down the piston ring. As a result, a low-tension piston ring has been implemented without increasing the engine oil consumption, and the sliding resistance has been reduced during reciprocating movement.
The piston is a full-floating type.