What is a Piston Ring?
Piston ring is used to insert the piston groove inside the metal ring, piston ring is divided into two types: compression ring and oil ring. The compression ring can be used to seal the combustible mixture gas in the combustion chamber; The oil ring is used to scrape excess oil from the cylinder.
The piston ring is a kind of metal elastic ring with large outward expansion deformation, which is assembled in the profile and its corresponding annular groove. Reciprocating and rotating piston rings rely on the pressure difference of gas or liquid to form a seal between the outer circle of the ring and the cylinder and one side of the ring and the ring groove.
Commonly used car engines have two kinds of diesel and gasoline engines, because of their different fuel performance, the use of piston rings are not the same.
Early piston rings were formed by casting, but with the progress of technology, high-power steel piston rings were born, and with the continuous improvement of engine functions and environmental requirements, a variety of advanced surface treatment applications, such as thermal spraying, electroplating, chromium plating, gas nitriding, physical deposition, surface coating, zinc-manganese phosphating treatment, etc., the function of the piston ring is greatly improved.
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Piston ring is the core component inside the fuel engine, it and cylinder, piston, cylinder wall together to complete the seal of fuel gas.
US LED lighting listed company RLVT 186 million acquisition of Apris
US high-end LED lighting solutions provider RevolutionLightingTechnologies Inc (RVLT) said on Wednesday that the company's $30 million (equivalent to about 186 million yuan) acquired Ampus LLC, including 10 million in cash and 10 million RVLT. Shares, and 10 million promissory notes. RVLT expects the transaction to increase its earnings per share in the second half of the year. It is reported that Ampres is a total solution provider for LED energy-saving lighting projects in the commercial, industrial, hotel and other industries. The 2015 revenue is expected to be $30 million. RVLT's acquisition of Apprise can not only expand the company's existing scale, improve profitability, but also expand its channels to commercial, industrial, hotel and other fields.