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提出了四基法校对内燃机气门间隙的新方法，通过已知气门间隙值反求缓冲角，为准确计算凸轮４个基圆夹角提供了基础，为２次调完增压和非增压四冲程内燃机的气门间隙提供了理论依据．
A new method of proofreading the valve clearance of internal combustion engine by four-base method is presented. By knowing the value of the known valve clearance value, the calculation of the angle of the base of the cam can provide a basis for accurately calculating the angle between the four base circles of the cam. Stroke internal combustion engine valve clearance provides a theoretical basis.