Engine technology put forward new requirements to the development of heavy cylinder

Future new requirements of heavy cylinder engine technology development mainly characterized by the following points as a result of the engine structure is more compact, thus sealing narrow with light structure, reduce parts stiffness, thus limiting bolt pre-tightening force to reduce the deformation of the cylinder, under high combustion pressure and temperature requirements there is a new combustion chamber sealing system in order to minimize the cylinder gasket tolerance and combustion chamber compression capacity and decrease the thickness of the cylinder pad. According to the developing trend, for such a new type of engine developed three new cylinder pad. The structure includes a plug of support plate, both sides is soft material layer. In order to improve the hot combustion gas chamber pressure and defence, set up a metal edge in the region of the combustion chamber. Soft material by non asbestos fiber packing and admixture of hydrophobic bonding medium. To optimize performance, in the development process of the various structural elements, such as the surface coating of silicone elastomer indentation, elastic sealing parts and so on has carried on the appraisal. In addition to improve performance, in recent years to solve the structure of the development difficulty is first developed asbestos substitute material. A coating metal cylinder cushion cylinder pad. In nearly a decade, the company will cylinder pad with a concave function layer on the mass production of truck engine. Unlike truck engine, car adopt cylinder pad for multilayer often special combination of metal coating. According to the request of sealing structure, thickness in the range. Through purposeful heating post-processing, obviously improve the fatigue strength under dynamic load. Middle tier and combustion chamber sealing parts adopt stainless steel or nickel chrome steel corrosion. Made of coating layer metal cylinder gasket has the following important characteristics. Combustion chamber surrounding raised due to the main part of the bolt force within the cylinder seal, cylinder pad of the combustion chamber surrounding should be upset, this is achieved by the middle tier surrounding edge or with the aid of the combustion chamber sealing parts. Through increasing the thickness of engine parts is elastic tension, thereby achieve local high stress in surrounding the cylinder. Local yielding parts used in individual cases, it can realize variable adjustment of the height of the cylinder cushion chamber surrounding. Simple structure is to use two function layer, like spring in series form, almost doubled the spring performance under the impact of the same. Use the middle tier for combustion chamber seal area raised and used to adjust the installation of the required thickness. Coating elastomer coating has special significance. To make sure that the metal layers to each other as well as the crankcase and cylinder head, need to use a thin coating of flexible and good adaptability, elastic coating can keep the micro sealing function after installation. With elastomer material can seal the whole fluid circulation channel, and only need a small pressure, the cylinder head bolt tightening torque is mainly decided by the combustion chamber seal of the pressure needed. Compared with the effective seal in the plane of the whole system can reduce the torque to a elastomer cylinder pad metal especially adapted to the structure of light.