Tectra Automation has launched another Rexroth innovation, the updated version of its planetary screw assembly (PLSA). Comprising a screw with planets as the rolling elements, and designed to transmit high forces, the PLSA converts rotary motion into linear and vice versa. The range of designs are many and varied, offering designers opportunities to solve transport and positioning tasks in configurations with a driven screw.
With three versions of the PLSA available – cylindrical single nut with backlash or preload; flanged single nut with backlash or preload, and flanged single nut, split, with preload – the design is structured so both the screw and nut have an identical multi-start profile with a flank angle of 90°. The planets have journals at both ends which are lodged in holes bored in the guide discs and the toothed ends of the planets engage with the internal gear rings of the nut. The planets have single-start threads and crowned flanks that roll without slipping along the nut threads, and at each end of the nut there is an internally geared ring which engages with the external gearing on the planets. Guide discs inside the gear rings support the planets’ journals and ensure that they are correctly spaced. The discs also prevent coarse dirt from working its way into the nut.
Tailored for the medium to heavy-duty machine construction industry, the PLSA is ideal for applications such as plastic injection moulding; valves and flaps for special machine construction; machine tools, and presses. It is used in the aerospace, steel, tyre, simulator and stage technology industries among others.
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