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目前,在以上各类轴承中用得最多的是图2-51中的a和表2-10中的a所例举的60°接触角推力角接触球轴承,其次是图2-51中的d和表2-10中的d所例举的滚针和推力滚子组合轴承。后者多用于大牵引力、要求高刚度的大型、重型机床。
3.60°接触角推力角接触球轴承
根据滚珠丝杠对轴承的要求,用于滚珠丝杠的轴承应具有较大的接触角。60°接触角的推力角接触球轴承如图2-52所示,就是较好的与滚珠丝杠配套的专用轴承。它的特点是:
① 接触角大,保持架用增强尼龙注塑成型,可容纳较多的钢球,因此轴向承载能力大,刚度高;
② 既能承受轴向载荷,又能承受径向载荷,故支承结构可以简化;
③ 根据载荷情况,轴承可以进行各种组合;
④ 这种轴承是根据规定的预紧力组配好,成组供应的,用户厂不需要自己调整;
⑤ 起动摩擦力矩小,可以降低滚珠丝杠副的驱动功率,提高进给系统的灵敏度。