键槽的不对称度误差现有两种不同的理解,如图1所示,(a)为键槽不对称度的技术要求;(b)为键槽的不对称度误差图解。第一种理解认为平面“Ⅰ”是键槽对称平面的理想位置,不对称度误差为△_1或△_2,此时△_1=△_2。第二种理解认为平面“Ⅱ”是键槽对称平面的 There are two different understandings of the asymmetry error of the keyway, as shown in Figure 1, (a) is the technical requirement of the asymmetry of the keyway, and (b) is the diagram of the asymmetry error of the keyway. The first understanding that the plane “Ⅰ” is the ideal location of the keyway symmetry plane, the asymmetry error △ _1 or △ _2, then △ _1 = △ _2. The second understanding that the plane “Ⅱ” is symmetrical keyway plane