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检测凸轮升程时,第一步是找到凸轮的最大升程点。传统的方法是把最大升程点确定在最大的“不变化”的测头示值范围的中间点上。最大升程点确定之后,就以该点对应的显示升程角作为检测基准角(即图上所示的0°升程角),左右测量出各升程角对应的测头示值,代入公式计算升程及升程误差。用此法检测凸轮升程,常会出现基准角两边升程误差相差很大,而使本来升程合格的凸轮认为不合格。这是由于这种方法确定的最大升程点,忽略了最大升程点附近实际存在的误差,而这误差的存在,就使这种方法确定的最大升程点偏离了凸轮实际的最大升程点(如图2、图3所示)。
When detecting cam lift, the first step is to find the maximum lift point of the cam. The traditional approach is to determine the maximum lift point at the mid-point of the largest “unchanging” probe indication range. After the maximum lift point is determined, the displayed lift angle corresponding to this point is used as the detection reference angle (ie, the 0 ° lift angle shown in the figure), and the probe indication value corresponding to each lift angle is measured left and right, Formula to calculate lift and lift error. This method of detecting the cam lift, often there is a large difference between the two sides of the reference angle lift error, leaving the original elevation of qualified cam that failed. This is due to the fact that the maximum lift point determined by this method ignores the actual error near the maximum lift point and the existence of this error causes the maximum lift point determined by this method to deviate from the actual maximum lift of the cam Point (as shown in Figure 2, Figure 3).