Research And Simulation Of Valve Stem Seal Oil Leakage

With rapid development of Chinese auto market, more and more car ownership,the public pay more attention to the valve exhaust gas pollution, but also aboutthe quality of the automobile and engine assembly and function more attention,is becoming more and more demanding. Valve stem seal as one of the importantcomponent parts of engine valve group, its main function is to carry on thedynamic sealing, the valve guide rod can control the oil entering into (row)leakage of the trachea, and between the valve guide and valve guide lubrication,prevent heat the channeling of the combustion chamber.Valve stem seal is one of the types of rubber oil seal, at present themainstream of the valve seal is a common sulfide with rubber and metal frame,and the spring groove on the outside of the main sealing lip with circular spiralspring. Valve stem seal is inside the engine with dynamic contact, valve guideand valve guide static contact, the valve guide to do reciprocating movementup and down, and the valve stem seal to the oil and gas in the combustion chamberthe often contact, the highest temperature can reach more than200degrees,so they require valve seal must adopt heat resistance and oil resistance,abrasion resistance are excellent materials, now often use fluorine rubber.Valve seal in order to satisfy the lubrication between the valve guide and valveguide, you must ensure that there are a small amount of oil through, at thesame time to control does not involve excessive oil into the combustion chamberin burning. First of all, the engine operation conditions, such as the speedof the engine is with valve seal ability of the dynamic control is closely linked,the other valve seal rubber materials and the related parameters of the sealingperformance is vital, as the radius of the main sealing lip lip peak value,peak spring groove of the circle to the main sealing lips center distance, the sealing lip and the range of the valve guide, corner of the oil level of upperand lower side of the face Angle, spring radial force and so on are the importantfactors that affect the oil leakage. Such as main sealing lip and valve guiderod, large amount of interference of the engine oil leakage will be too little,but the valve seal will wear too fast, and other factors such as constant, themore elastic rubber oil leakage.At present, with the international standardsand national standards for discharge asks is ceaseless rise, is becoming moreand more strict to the requirement of valve oil seal, it requires that the valveseal should be able to better withstand high temperature, abrasion etc, andhas long service life, reliable sealing performance, etc. To pursue these goals,domestic and international numerous engine research and development company,valve seal company research and development, and some research institutions,has been in the pursuit of providing valve seal material and seal performance.This thesis with the influence of valve oil seal in the oil leakage factoranalysis, and establish a computer simulation, based on the finite element modelfor some of the elements with a bench test compared with the result of computersimulation of policy, finally proved that computer simulation model is accurateand reliable, can be used for valve seal design process of new products in thefuture.