Piston assembly having counterflow thwarting construction for use in an internal combustion engine
AssigneeSamyung Machinery Co., Ltd.
InventorGeum Tai Han
Life of this patent
Estimating the term…
Abstract
A one piece piston for use in an internal combustion engine provided with a plurality of compression rings and oil rings on its circumferential surface includes ring grooves having a hole communicating with an inside of the piston, oil rings received in the ring grooves, respectively; and a keeping ring mounted between the oil rings and having on its internal surface a spring receiving groove whose inner diameter is larger than an outer diameter of a ring type spring, wherein a separation between an external surface of the ring groove and the internal surface of the keeping ring is maintained equal to that of the compression ring and a hole is formed to allow the ring groove to communicate with the inside of the piston.
Claims7
A one piece piston for use in an internal combustion engine provided with a plurality of compression rings and oil rings on its circumferential surface, the piston comprising:
- ring grooves having a hole communicating with an inside of the piston;
- oil rings received in the ring grooves, respectively;
- and
- a keeping ring mounted between the oil rings and having on its internal surface a spring receiving groove whose inner diameter is larger than an outer diameter of a ring type spring, wherein a separation between an external surface of the ring groove and the internal surface of the keeping ring is maintained equal to that of the compression ring and a hole is formed to allow the ring groove to communicate with the inside of the piston.
A dividable piston for use in an internal combustion engine having a crown whose upper side is made of heat resisting material, and a piston body provided with a plurality of compression rings and oil rings on its circumferential surface, the piston characterized in that:
- a hole is formed through a lower circumferential surface of the crown to allowing a ring groove into which said oil ring is inserted to communicate with an internal surface of the crown, wherein oil introduced into the ring groove by the oil ring is drained along an oil passageway via the hole;
- and
- a semi-circular protrusion is symmetrically made by partially cutting portions near a pin hole and an oil passageway communicating with the holes is formed through a body of the piston, the oil passageway also communicating with a plurality of holes formed radially inwardly from the upper peripheral surface of the piston body and a drain hole positioned vertically.
Dependencies are inferred from the claim text.