气缸垫,又叫气缸衬垫,位于气缸盖与气缸体之间,其功用是填补气缸体和气缸盖之间的微观孔隙,保证结合面处有良好的密封性,进而保证燃烧室的密封,防止气缸漏气和水套漏水。
按所用材料的不同,气缸垫可分为金属-石棉衬垫、金属-复合材料衬垫和全金属衬垫等多种。金属-复合材料衬垫和全金属衬垫均属无石棉气缸衬垫,因没有石棉夹层,从而可消除衬垫中气囊的产生,也减少了工业污染,是当前的发展方向。
金属-石棉衬垫
金属-石棉衬垫以石棉为基体,外包铜皮或钢皮,另一种金属-石棉衬垫是以扎孔钢板为骨架,外覆石棉及粘结剂压制而成,所有金属-石棉衬垫均在气缸孔、冷却液孔和机油孔周围用金属板包边。为了防止高温燃气烧蚀衬垫,还可在金属包边内置入金属架加强环。金属-石棉衬垫具有良好的弹性和耐热性,能重复使用多次。若将石棉板在耐热的粘合剂中浸渍以后,则可增加气缸垫的强度。
金属-复合材料衬垫
金属复合材料衬垫是在钢板的两面粘覆耐热、耐压和耐腐蚀的新型复合材料,在气缸孔、冷却液孔和机油孔周围用不锈钢皮包边,
金属衬垫
金属衬垫强度高,抗腐蚀能力强,多用于强化程度较高的发动机上。
Cylinder head gasket,Also called cylinder gasket,between the cylinder head and the cylinder block,and the cylinder head,ensure good sealing at the joint surface,and then keep the chamber sealed Prevent air leakage from the cylinder and water jacket.
Cylinder Gasket can be divided into metal-asbestos gasket, metal-composite gasket and all-metal gasket according to the material used.Metal-composite gasket and all-metal gasket are asbestos-free cylinder gasket, which can eliminate the production of air bags and reduce industrial pollution due to the absence of asbestos interlayers.
Metal-Asbestos gasket
Metal-Asbestos gasket based on asbestos, coated with copper or steel,Another metal-asbestos gasket is made of a perforated steel plate with an outer layer of asbestos and a binder.In order to prevent the high temperature gas ablation gasket, the metal frame reinforcing ring can also be placed in the metal envelope.Metal-Asbestos gasket has good elasticity and heat resistance and can be reused many times.The strength of the cylinder gasket can be increased if the asbestos sheet is impregnated in a heat-resistant adhesive.
Metal-composite gasket
The metal composite gasket is a new type of composite material which is resistant to heat, pressure and corrosion on both sides of the steel plate,stainless steel bag edges around cylinder, coolant and oil holes.
Metal gasket
The metal gasket has the advantages of high strength and strong corrosion resistance.