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1747-L532
种滚珠链工作时受力状态的比较图
(a) 采用三维型导珠管，沿内螺纹的导程角f方向插入滚珠螺母体内并与滚道相切(而不是相交)，三维导珠管顺利导引滚珠流畅地出入循环返向装置，使布氏撞击耗损明显减小，摩擦力矩平滑、噪声低。
(b) 在滚珠链各相邻滚珠之间加入用特殊树脂制造的滚珠隔圈，它避免了相邻滚珠之间的摩擦、挤压和碰撞，还能润滑滚动体、延长工作寿命。右图为三种滚珠链工作受力状态之比较。采取上述两项措施使动态转矩更趋平滑，噪声降低5～8dB(A)。日本TNK的SBN系列，NSK公司的SI系列，台湾PMI的E型滚珠回流系统等均采取了上述措施。SBN系列直径Ø32～50mm，导程10～20mm，d0n值130000，0>78m/min，加速度1g。
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