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滚珠丝杠机构,在需要快速移动和精确定位的机床中已获得广泛使用。但是,这种机构螺母和丝杠始终啮合,容易导致机构的过早磨损。如果使滚珠螺母与丝杠在非必要时脱离啮合则可以提高滚珠丝杠机构的耐用度。开合滚珠螺母(苏联发明证书号1260614)由通过螺母轴线的开合面的两个半螺母2和6组成(见附图a),这两半螺母可以沿着执行机构7的导轨(见图b)作垂直于螺母轴线的开合运动。两半螺母分开时,位于螺母径向槽之间螺旋槽内的扭簧4松开,它
Ball screw mechanism, in the need for rapid movement and precise positioning of the machine has been widely used. However, this type of mechanism nut and screw always mesh, easily lead to premature wear and tear of institutions. The durability of the ball screw mechanism can be improved if the ball nut and the lead screw are disengaged when not necessary. The opening and closing ball nut (Soviet Invention Certificate No. 1260614) consists of two half nuts 2 and 6 (see Fig. A) through the opening and closing face of the nut axis, which can follow the guide of the actuator 7 b) for the opening and closing movement perpendicular to the axis of the nut. When the two halves are separated, the torsion spring 4 in the spiral groove between the radial grooves of the nut is loosened