PISTON, PISTON RING, PISTON PIN [SKYACTIV-G 2.0]

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Purpose, Function

Piston

•  The piston in the cylinder of the cylinder block moves reciprocally by the pressure received when the air-fuel mixture combusts.

Piston ring

•  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.

Piston pin

•  The reciprocating movement of the piston is transmitted to the connecting rod by the connection of the piston pin to connecting rod.

Construction

Piston

•  The high-temperature strength piston is made of aluminum alloy with excellent thermal conductivity.

•  The piston has a cavity on the top surface. As a result, the initial combustion flame is prevented from hitting the top surface of the piston to reduce cooling loss.

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•  The sliding resistance has been reduced by optimizing the piston skirt shape.

•  A weight reduction is realized by optimizing the piston shape.

•  With the adoption of the offset piston, piston slap is suppressed.

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Piston ring

•  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 worsening the engine oil consumption, and the sliding resistance has been reduced during reciprocating movement.

Piston pin

•  The piston is a full-floating type.