一、关于凸轮过渡曲线中的缓冲段及间隙圆。所谓缓冲段,就是在凸轮外形上用以保证挺杆克服气门间隙和静变形及其允差对配气相位影响的一个区段。为了获得足够大的气门开启时间断面和气门升程及最佳的气门运动规律、配气定时,在凸轮设计时,一般把气门的开闭点设在缓冲段内。在使用中,气门间隙过大和制造误差等,容易使气门杆倾斜提前落座而影 First, on the cam transition curve in the buffer section and gap circle. The so-called buffer section, is in the cam shape to ensure that the tappet to overcome the valve clearance and static deformation and its tolerance on the gas phase of a section. In order to obtain a sufficiently large valve opening time profile and valve lift and the best law of valve movement, valve timing, the cam design, the general opening and closing valve in the buffer zone. In use, the valve clearance is too large and manufacturing errors, easy to make the valve stem tilt ahead of schedule