Oldham coupling
The Oldham coupling , also known as a cross slot coupling or cross slide coupling in German-speaking countries , is a non-switchable, torsionally rigid coupling that can compensate for a radial misalignment between two parallel shafts. The Oldham coupling is named after its inventor, John Oldham, who developed it in Ireland in 1820 .
Structure and functionality
The Oldham coupling consists of three individual parts: Two disks, the coupling hubs, are attached to the respective shaft ends, for example by means of a screw connection or a feather key connection . The third disc is a sliding joint in the form of a cross disc (transmission disc) and is mounted between the coupling hubs by two orthogonal tongue and groove connections . While the coupling hubs are usually made of metallic materials ( steel or aluminum ), plastic , for example polyoxymethylene (acetal) or polyetheretherketone (PEEK), can be used for the sliding joint . The use of plastic also entails electrical insulation of the two shafts connected by the coupling.
If there is an offset in the radial direction between the two shafts, this is compensated for by a movement of the sliding joint relative to the coupling hubs. Depending on the design, slight angular misalignments and axial misalignments can also be compensated.
The Oldham coupling is a form-fitting coupling, one of the advantages of which is that it is easy to assemble by plugging the individual elements together. Due to its construction, the Oldham coupling is only approved for low torque loads. For example, an Oldham coupling for a shaft diameter of 50 mm can transmit a torque of around 30 Nm. In the event of an overload, the cross disc is damaged first, which can be replaced without dismantling the coupling hubs.
Due to the constant sliding movement, the Oldham coupling is subject to high wear, which requires careful lubrication . An attempt is made to reduce this wear by preloading the sliding joint. In continuous operation, the maximum transferable torque is around three to four times less than with brief loads due to temperature effects. Oldham couplings are therefore particularly used in stepper motors .
See also
- Schmidt coupling , another coupling to compensate for radial misalignment
Web links
Individual evidence
- ↑ Franz Reuleaux : Theoretical Kinematics: Fundamentals of a theory of mechanical engineering . 1875, p. 315 ( full text in Google Book Search).
- ↑ Drivacu Antriebstechnik GmbH Schweinfurt. Retrieved April 24, 2018 .
- ↑ a b Georg Jacobs (Ed.): Maschinengestaltung Volume II. Verlag Mainz, Aachen 2016, ISBN 978-3-86130-749-5 , p. 56f.
- ↑ a b c d Orbit Antriebstechnik GmbH: Catalog Oldham Coupling ( Memento of the original from June 12, 2016 in the Internet Archive ) Info: The archive link has been inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. . Orbit Antriebstechnik website, accessed June 12, 2016.
- ↑ a b Orbit Antriebstechnik GmbH: Cross slide couplings | Orbit drive technology. In: www.orbit-antriebstechnik.de. Retrieved June 12, 2016 .
- ↑ a b VMA Antriebstechnik: Cross slide couplings KSK .
- ↑ Product. (No longer available online.) In: www.ha-co.eu. Archived from the original on June 12, 2016 ; accessed on June 12, 2016 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
