piston ring
noun
1.
a metallic ring, usually one of a series, and split so as to be expansible, placed around a piston in order to maintain a tight fit, as inside the cylinder of an engine.
Also called
packing ring,
ring
.
Origin
1865-70
Examples from the web for
piston ring
It became one of the largest
piston ring
manufacturers in the world.
Oil consumption and crankcase contamination are reduced by using a newly designed upper piston and
piston ring
.
The failed
piston ring
seals were fabricated from resin impregnated leather.
piston ring
wall thickness was increased to displace refrigerant gas in the ring groove of the piston.
One of the rope brake components subjected to wear was the
piston ring
gasket.
The engineering crew began replacing a damaged exhaust valve gear
piston ring
and several o-rings.
British Dictionary definitions for
piston ring
piston ring
noun
1.
a split ring, usually made of cast iron, that fits into a groove on the rim of a piston to provide a spring-loaded seal against the cylinder wall