许多日本汽油发动机的配气机构采用OHC型(顶置式)液压挺柱传动,克服了机械式挺柱的许多弊病,其主要优点是,配气机构噪音降低,不需调整气门间隙。在日常维修这类发动机中,经常碰到“嗒、嗒、嗒”的气门异响声音。按液压挺柱性能来说,是不应有这种异响的。是什么原因引起这种异响的?兹作如下分析。 Many Japanese gasoline engine’s gas distribution mechanism adopt OHC (overhead type) hydraulic tappet drive to overcome many shortcomings of the mechanical tappet. The main advantage is that the gas distribution mechanism reduces the noise and does not need to adjust the valve clearance. In the routine maintenance of such engines, often encounter “click, click, click” valve noise. According to hydraulic tappet performance, there should be no such abnormal sound. What causes this abnormal sound? Here is the analysis below.