scraper ring

scraper ring

[′skrāp·ər ‚riŋ]
(mechanical engineering)
A piston ring that scrapes oil from a cylinder wall to prevent it from being burned.

scraper ring

The bottom ring on a piston whose function is to scrape lubricating oil away from the cylinder walls of a reciprocating engine. This prevents the oil from getting into the combustion chamber of the cylinder. Also called a wiper ring.
References in periodicals archive ?
In modern gasoline engines, a scraper ring with a step recessed from the lower outer edge has become a common design for the second ring in a piston-ring pack.
Although previous study suggested that a scraper ring step can provide a reservoir for oil [1], the effect of its geometry and dimensions on oil transport and oil consumption has not been completely understood.
In this work, an oil transport mechanism that is closely associated with the dimensions of a scraper ring step will be described.
Particularly, oil can be trapped in a scraper ring step and the trapped oil can result in bridging.
Each simulation started with an arbitrary oil distribution in a scraper ring step and on a third land.
The engine was disassembled: three piston skirts were broken, the bottom scraper ring from each broken piston was found in the oil sump.
There is a scraper ring inside the swivel lock actuator that keeps dirt and grime from entering the actuator.
Tenders are invited for Supply Of Oil Scraper Ring For Make Up Gas Compressors Of Make Nuovo Pignone
Their concentration on retaining an oil sump, oil scraper rings, and relying on plain bearings instead of roller bearings," he theorizes, "increased the amount of oil burned, which harmed emissions performance.
Tenders are invited for Supply Of Oil Scraper Rings And Main Packings For Bp And Cl Make Off Gas Reciprocating Compressor