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滚珠丝杠副是在丝杠和螺母之间放入适当数量的滚珠,这些滚珠作为传动件,在螺母的闭合回路中循环滚动,使丝杠螺母副的运动由滑动变成滚动,故摩擦系数很小,约为0.002～0.008。这种螺旋传动机构比一般滑动丝杠螺母传动效率高2～4倍;传动精度高,传动副爬行小;起动力矩小,传动灵敏;采用双螺母预紧,能消除轴向间隙并提高刚度;由于丝杠、螺母及滚珠均经过热处理,故磨损少,使用寿命长。虽然它的结构较复杂,制造工艺要求高,价格贵,但由于上述优越性,仍得到广泛应用。一、概述
Ball screw is put in between the screw and nut an appropriate number of balls, these balls as a transmission member, the nut in the closed loop cycle rolling so that the movement of the screw nut vice from sliding to rolling, so the friction coefficient Small, about 0.002 ~ 0.008. This screw transmission mechanism than the average sliding screw nut transmission efficiency of 2 to 4 times higher transmission precision, crawler crawler small; starting torque, transmission sensitive; using double nut preload, to eliminate axial clearance and increase rigidity; As the screw, nut and ball are heat treatment, so less wear and tear, long service life. Although its structure is complex, the manufacturing process requires high, expensive, but due to the above advantages, is still widely used. I. Overview