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Customised planetary roller screws from LTK

More power density, accuracy & reliability with customised planetary roller screws.

Advantages

Advantages of customised planetary roller screws from LTK

Maximum power density

ULTRA.ROLL roller screws have an extremely high power density, as the number of contact points is maximised compared to other lead screws.

Compact design

LTK’s roller screws optimise the number of contact points in a minimum of installation space. This allows spindle and nut diameters to be minimised.
ULTRA.ROLL roller screws are particularly suitable for applications in the field of heavy-duty spindle drives, servo presses, dosing systems, riveting processes, actuators or safety valves.

Benefits

Your benefits of ULTRA.ROLL planetary roller screws

  • Standard spindles and customised development projects
  • Customised adaptation of spindle, nut and bearing unit
  • Compact design thanks to functionally integrated nuts
  • Development lab and product experts

Construction types

Our roller screws are available for all types of design

  • Roller screws with roller recirculation
  • Roller screws without roller recirculation
  • Inverted roller screws
  • Planetary roller screws
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    Function

    How does a roller screw work?

    A planetary roller screw (also known as a planetary screw drive or threaded roller screw drive) is a drive screw that uses rollers or so-called planets to convert a rotational force into a translational movement. Its functional principle combines the features of a roller bearing and a planetary gearbox (see illustration). The planetary rollers are firmly guided in the nut and transmit the rotary motion of the spindle rod.
    The resulting advantage is that high forces can be converted at high dynamics (speed and acceleration). By using rollers as rolling elements to transmit the movement and load, a high load capacity, precision and a longer service life can be achieved.

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    Performance

    Performance range of ULTRA.ROLL planetary roller screws

    Performance featuresMin.Max.
    Cstat (Static load rating)
    4000kN
    Cdyn (Dynamic load rating)
    1300kN
    Diameter
    15mm
    120mm
    Pitch
    1
    40
    Length
    3000mm
    Max. permissible deviation
    G1 6μ/300mm
    G5 23μ/300mm
    Further featuresYour advantages
    Nut designs

    Fully customisable according to customer drawings:

    • End and centre flange nut
    • Cylinder nut
    • Double nut
    • Special nut with additional mounts and highly functionally integrated

    …and much more!

      Special nut

      Integration of screw-on surfaces, anti-rotation locks, centring, cardan bolts, etc.

      Spindle bearing

      High-performance range for round flange or standing flange solutions, optimised for heavy-duty applications in various bearing positions. Fully sealed and lubricated for life

      Field of application

      All applications that require the highest load ratings, service life, low-noise operation and integration

      Lifespan

      Will be calculated

      Delivery time

      10-14 weeks from order placement, express production on request


      The LTK ULTRA.ROLL customised roller screws offer a significantly higher power density compared to conventional drive spindles such as ball screws or trapezoidal spindles. This advanced screw combines unrivalled dynamics and power, making it particularly efficient. With accuracies of up to 6 µm per 300 mm (G1) max. permissible path variation, LTK ULTRA.ROLL is able to achieve the highest precision. The high repeatability and positioning accuracy ensures that it works consistently and reliably. Thanks to its compact design, LTK ULTRA.ROLL is an ideal solution for various demanding applications. It is ideal for use in servo presses, dosing systems, riveting processes and safety valves. It is also ideal for applications in the hygiene sector and in the pharmaceutical industry, where maximum precision and reliability are required.

      Customised solutions

      German engineering for your special requirements

      Do you have special requirements that you could not find? Then we look forward to hearing from you and developing a solution together! Our specialists will be happy to advise you on how to realise your individual requirements. In addition to the development of your roller screws, with ULTRA.ROLL you benefit from many other services (special surface treatments, food-safe greasing and much more). All our products are engineered and manufactured in Germany.

      • Large number of successfully completed development and series projects
      • Years of experience, know-how and expertise in the field of roller screws and precision spindles of all designs
      • Fast delivery time and constructive design
      • Engineering and manufacturing 100% in Germany

      FAQ

      Interesting facts about planetary roller screws

      Which types of roller screws do we offer?

      There are three basic types of roller screw drives:

      • Roller screw drives with roller feedback
      • Roller screw drives without roller feedback
      • Inverted roller screws

      In roller screw drives without roller feedback, the spindle is synchronised with the nut via the planetary gearring. This eliminates the need to reposition the planetary roller, which allows higher speeds. The gearing means that the position of all components is determined at all times. The spindle can therefore also be developed without slippage or backlash.

      In roller screw drives with roller feedback, the planetary roller is moved to the next ‘thread’ at the end of a lead. This design enables smaller pitches and a more compact design, but is subject to slippage due to the design.

      Inverted roller screws differ fundamentally in their design from all other mechanical drive screws. This design consists of a nut tube, planetary rollers and a push rod. All components are inverted; the thread is located in the nut tube and the push rod moves instead of the nut. This is ideal for applications in the hygiene sector, where installation space is limited and as a replacement for hydraulic lifting cylinders.

      What is the difference between a ball screw and a roller screw?

      The performance of roller screws exceeds that of ball screws many times over due to the higher number of contact points. The roller screw drive can therefore move higher forces in the same installation space and impresses with a longer service life. The roller screw drive is also particularly suitable for smaller pitches or when only very little installation space is available. The drive types therefore differ in terms of load capacity, speed, precision, efficiency and price. In order to make a measurable statement in facts and figures, the respective application must be considered in detail. Ground ball screws, for example, are very precise drives, but this also has a direct influence on the price.

      Explanation: KGT = ball screw drive; GRT = roller screw drive; PWG = planetary screw drive

      When is it best to use a planetary roller screw?

      With regard to modern production possibilities, it is worth considering the use of a roller screw drive as soon as one of the following cases applies:

      • Small available installation space
      • High power density required
      • High forces & dynamics
      • High ambient temperatures
      • High safety requirements (failsafe application)
      Applications and use of roller screws

      Roller screws are used in various high-precision and heavy-duty applications, such as in the machine tool industry, in the aerospace industry, in robotic systems or in medical and measurement technology. Roller screws are particularly suitable for pressing and punching tasks or as a replacement for hydraulic drives/hydraulic cylinders. Common processes include welding, sealing, joining, pressing, assembling and positioning.

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        Workflow

        Your path to a customised solution

        1

        Needs
        assessment

        Let us know what you need – our experts will analyse your requirements to find the right solution for you.
        2

        proposed solution
        & offer

        Customised solutions quickly require a target price and a delivery time. On the basis of an initial discussion, we provide you with solution proposals for your decision.
        3

        Development
        & implementation

        Our team develops a customised solution that is precisely tailored to your specific needs. We offer both from a single source.
        4

        Commissioning
        & support

        We are also there for you personally during commissioning. With our after-sales service, we support you from implementation to the last shift of the machine.
        Contact
        Curious to find out more?
        Talk to us personally.

        kontakt-ltk

        Benjamin Schwegler

        Your contact for customised solutions