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Oldham coupling
The Oldham coupling belongs to the group of cross disc couplings and is regarded as a special design within this group of couplings.
Definition of an Oldham coupling
The Oldham coupling belongs to the group of cross disc couplings and is regarded as a special design within this group of couplings. The Oldham coupling consists of 3 discs. The two outer discs are attached to the shafts in question and the middle one is held in two tongue and groove connections at right angles to each other. The Oldham coupling transfers the torque accurately, but also permits a parallel offset and low angle and axial displacement. There is no change in speed when transferring the torque.
Oldham couplings from MISUMI
The design of the Oldham coupling can be specially configured and can be tailored to the individual application in question. Potential misalignments include an angular offset, a radial offset or axial clearance. The angular offset describes a parallel fault between the centre points of two shafts, and the radial offset is the angular error between two shaft centre lines. In an axial offset, the different shafts are displaced axially. This maladjustment arises when the motor accelerates or when it swells due to rising temperatures. The permissible torque range can also be adapted to suit individual requests, as well as the shaft hole diameter, the outer diameter, total length and maximum revolution range. There is also a version with high torque, and one with a low moment of inertia.
With regard to the type of shaft hole, you can choose from a drilled hole with a groove on various sides, or standard drilled holes. The interior diameter of the shaft can be scaled in 0.1 millimeter steps. For the basic design of Oldham coupling, you can choose from MCOWK, MCO, MCORK and MCOLK. The basic material for the Oldham coupling is EN 1.4301 equivalent. Sintered alloy, a carbon-fibre reinforced acrylic, is used for the buffer section. The operating temperature for the coupling is -40 to around -90 degrees Celsius. The permissible values for angular displacement, radial displacement and axial clearance are independent of each other. If there are a number of displacements at the same time, the maximum permissible value for each displacement reduces by half.