Divided by structure

A. Integral structure: the process of casting or integral molding.

B. Combined ring: a piston ring composed of two or more parts assembled in a ring groove.

C. Slotted oil ring: an oil ring with parallel sides, two contact lands and oil return holes.

D. Slotted spiral spring oil ring: the oil ring of spiral spring is added to the slotted oil ring. The support spring can improve the radial specific pressure, and its force on the inner surface of the ring is equal. Common in diesel engine rings.

E. Steel belt combined oil ring: oil ring composed of lining ring and two Scraper rings. The design of lining ring varies with the manufacturer, and it is commonly used in gasoline engine rings.

Divided by section shape

Barrel surface ring, cone surface ring, inner chamfer twist ring, wedge ring and trapezoidal ring, nose ring, outer shoulder twist ring, inner chamfer twist ring, steel belt combined oil ring, opposite chamfer oil ring, same chamfer oil ring, cast iron spiral spring oil ring, steel oil ring, etc.