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Thecontactangleisdefinedastheangle判散配bet老律东客地困器weenanimaginarystraightlinejoiningthepointsofcontactoftherollingelementswiththeracewaysandalineperpendiculartother官otational掘指axis即滚动体和滚道接触的的假想连线与旋转轴的垂直线的夹掘铅角