What is a car cylinder mattress
automotive cylinder mattress , also known as cylinder pad , is a sealing gasket installed between the engine cylinder head and the cylinder block. Its main function is to fill the microscopic pores between the cylinder block and the cylinder head, to ensure that the joint surface has a good sealing, and then to ensure the sealing of the combustion chamber, to prevent cylinder leakage and water jacket water leakage .
The basic function of the cylinder pad
sealing : Cylinder gasket ensures the seal between the cylinder head and the cylinder block to prevent air leakage, oil leakage and water leakage. It can maintain enough strength in the harsh environment of high temperature and pressure, not to be damaged, and can compensate for the uneven contact surface, maintain the sealing performance .
Heat and pressure : the cylinder gasket needs to withstand the high temperature and high pressure of the combustion gas in the cylinder, and resist the corrosion of oil and coolant. It should have sufficient strength and elasticity to compensate for the deformation of the cylinder head and cylinder block under stress .
Type of cylinder pad
metallic asbestos pad : asbestos as the matrix, external copper or steel skin, with metal wire or metal cutting in the middle, good thermal conductivity, first-class elasticity and heat resistance, widely used .
sheet metal gasket : made of low carbon steel or copper sheet stamping, suitable for high strength engine, strong sealing but easy to wear .
metal skeleton asbestos pad : with metal mesh or punched steel plate as the skeleton, covered with asbestos and adhesive, good elasticity but easy to stick .
single-layer thin steel plate with heat-resistant sealant : the surface flatness of the cylinder head and cylinder block is required to be high, but the sealing effect is excellent .
Precautions for installation and replacement
installation direction : Cylinder pads with flanging should be installed in the direction of flanging, usually toward the cylinder head or block, depending on the material collocation .
Marking direction : If there are letters or markings on the cylinder pad, these markings should be towards the cylinder head .
bolt tightening sequence : when pressing the cylinder head, the bolts should be tightened 2-3 times from the middle to both sides, and the last time according to the manufacturer's regulations. Disassembly is also divided from both sides to the middle 2-3 times loose .
temperature requirements : it is strictly prohibited to disassemble and install the cylinder head in hot state, otherwise it will affect the sealing .
The main role of the automobile cylinder mattress is to ensure the tightness between the cylinder head and the cylinder block to prevent air leakage, oil leakage and water leakage . It can maintain enough strength under high temperature and high pressure conditions, not to be damaged, and has a certain degree of elasticity, can compensate for the uneven contact surface, to ensure good sealing .
The specific functions of the cylinder mattress include:
Fill the microscopic pores between the cylinder block and the cylinder head to ensure good sealing at the joint surface, and then ensure the sealing of the combustion chamber to prevent cylinder air leakage and water jacket water leakage .
Keep the cylinder seal air-tight to prevent coolant and oil leakage .
Heat resistance, corrosion resistance , can maintain stability in high temperature and high pressure environment .
compensates for uneven contact surface to ensure first-class sealing .
In addition, the cylinder mattress also needs to have sufficient strength, pressure resistance, heat resistance and corrosion resistance, and must have a certain degree of flexibility to cope with the deformation of the cylinder head caused by air force when the engine is working.
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