Piston and piston rings withstand greater thermal and mechanical loads. This has become the key to the diesel engine to improve fuel efficiency and durability. The foreign manufacturers are developing a variety of new and more practical structure piston.
    1、 live classes of cavity cavity piston with light and medium-sized diesel engines for trucks and non-road. The main advantage is that the cavity piston top structure change alternate of combustion conditions and reduce the emissions of carbon complex compound. The instantaneous thermal stresses generated by this structure of the piston is high, the need to adopt new materials processing technology, such as using a fiber reinforced to meet higher requirements for squeeze casting. For reducing nitrogen oxides N Qiu) emissions due to higher temperature of the cavity piston, this is not ideal. Measures to reduce carbon complex compounds gradually increase the bit of the first piston ring t, reducing the first piston ring around the seam in addition to the "Crevice Volume). Doing so will increase the edge of the top of the piston cavity alternating mechanical stress, the potential impact of the piston ring and ring dry durability.
    2、 the Articulated live close articulated piston has been used in the U.S. high-power medium-speed diesel, but is less popular in Europe. Articulated piston with steel piston top, usually through bronze bushings fire load is passed directly to the piston pin. Cast aluminum alloy piston skirt serves as a guide mounted on the piston pin. This separate load the biography John and oriented functions, and its purpose is to piston rings providing appropriate ring the explants bit t and reduced oil consumption. The But prices articulated piston high, and has a higher reciprocating quality t, especially on small engines, the piston reciprocating quality, vibrate, voice sound and rough climb Guan Rui factors.