Piston Ring

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piston ring

[′pis·tən ‚riŋ]
(design engineering)
A sealing ring fitted around a piston and extending to the cylinder wall to prevent leakage. Also known as packing ring.

Piston Ring


a split, springy metal ring installed in the groove of a piston. The piston ring presses against the cylinder wall of a reciprocating engine as a result of its own tension or under pressure from a flat, steel spring. Piston rings may be of the compression type or oil-scraper type. Compression rings seal the gap between the piston and the cylinder and conduct heat from the piston; oil-scraper rings remove excess oil from the working surface. Piston rings are usually made of high-quality gray iron. Bronze piston rings are sometimes used in pumps.

References in periodicals archive ?
15, 2015 /PRNewswire/ -- MAHLE delivers improved top piston rings using a new thermal spray coating for modern high-output direct-injection turbocharged gasoline engines (GTDI).
The comparative studies of influence of the contact materials between the top piston ring and cylinder liner are obviously very difficult to realise in their real environment.
Cast iron for decades has been the material of choice for the second piston ring because of its wear characteristics and compatibility with other engine-design features.
The Daros Group's piston ring business, which has operations in China, Germany and Sweden, adds approximately 220 employees to Federal-Mogul's global operations, which employs nearly 41,000 people in 33 countries.
However, the really big news came in March when it completed the acquisition--at a knockdown price--of Dana's engine hard parts business, the main products of which are piston rings, engine bearings, cylinder liners, and camshafts manufactured and sold under the Perfect Circle, Clevite, and Glacier Vandervell brands.
The Carburetor, Piston, Piston Ring, and Valve Manufacturing Industry report is the most comprehensive market research report available on this industry.
The Daros Piston Ring business adds approximately 220 employees to Federal-Mogul's global operations and the acquisition includes manufacturing locations in China, Sweden and Germany.
Castings: Two piston rings, cast in low-carbon equivalent, high-strength class 40 gray iron via green sand casting.
Table 1: Leading Players in Worldwide Pistons Market (2006E): Market Shares by Company - Mahle, Kolbenschmidt, Federal- Mogul and Others (includes corresponding Graph/Chart) II-4 Piston Rings II-4 Trends in Piston Ring Materials, Designs, and Coatings II-5 Cast Iron Rings Vie with Moly-Faced Ring Set in Late Model Engines II-5 Ring Sets Moves Higher Up II-5 Rings Get Thinner and Smaller II-5 Piston Rings Turn Smoother, Flatter II-5 Piston Rings Coating: A Solution to Microwelding and Groove Pound-out II-5 Engine Valves II-6
The auto parts maker is considering a range of proposals including setting up a piston ring production line at its existing factory in Kumagaya, Saitama Prefecture, north of Tokyo, which also manufactures other devices, the sources said.
The coating fills a groove on the piston ring face to deliver a long-lasting seal.