Piston ring assembly for hydraulic mechanisms, particularly such

Piston ring assembly for stirling engine

Piston ring assembly with tangential expander

Piston ring construction

Piston ring employing elastomeric sealing member within the ring

Piston ring for an internal combustion engine

Piston ring for internal combustion engine

Piston ring for internal combustion engine

Piston ring having a function which is for facilitating supply o

Piston ring having a non-uniform radial pressure distribution

Piston ring having nitriding layer and composite Ni-B plating la

Piston ring having shape of an ellipse or an elongated circle

Piston ring having tapered outwardly extending wiper

Piston ring of "Y" cross-section

Piston ring seal having angled ends

Piston ring seal with pressure distribution grooves

Piston ring set for reciprocating engines

Piston ring spacer-expander with overlap-preventing expander joi

Piston ring structure

Piston ring system