Shaft Couplings/

Oldham Couplings

Oldham couplings are constant velocity couplings used for connecting two parallel shafts that are close together and run at the same speed. They are composed of three parts: a center piece sandwiched in between two hubs. The two hubs of Oldham couplings are generally made out of steel, stainless steel or aluminum while the center component is usually a plastic material and rarely metal. Torque transmission is accomplished by interlocking the slots of the center piece with the drive tenons of the hubs. They fit together by snapping into place, which creates zero backlash.

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R + W America, LP
Bensenville, IL
888-479-8728
Offering the ultimate in couplings, R + W America is a versatile and innovative shaft coupling manufacturer for power transmission applications in a wide range of industries. As an ISO 9001 certified company, R + W America is able to meet special requirements and provides precision and quality in a complete line of rigid and flexible shaft coupling products including oldham couplings and more.
 
Guardian Industries, Inc.
Michigan City, IN
219-874-5248
As a world leading shaft coupling manufacturer, Guardian Industries provides custom design and manufacturing as well as stock coupling products including oldham couplings and many more. With over 60 years of experience, Guardian Industries features continuous product improvements and competitive pricing on high quality power transmission components for use in a broad spectrum of industries.
 
Elbe & Sohn Inc.
South Haven, MI
269-637-7999
As a leading power in the power transmission industry, Elbe & Sohn Inc. provides a complete range of shaft couplings and other parts including oldham couplings to a variety of industries such as industrial, automotive and marine. With a location in the US and several production facilities across Europe, Elbe & Sohn is an international driving force in the field of power transmission technologies.
 
Ringfeder Power Transmission
Westwood, NJ
888-746-4333
Ringfeder Power Transmission is a component and system manufacturer with a global presence. Serving all industries including packaging, automation, energy, mining, transportation and defense, Ringfeder PT offers flexible, torsionally rigid disk, backlash-free servo-insert, safety overload, bellow and magnetic couplings and a complete line of Ringfeder® & Ecoloc® keyless shaft-hub locking devices.
 
DieQua Corporation
Bloomingdale, IL
630-980-1133
As a manufacturer and supplier of shaft couplings and other power transmission parts, DieQua Corporation offers optimum solutions for customer requirements and welcomes any and all design challenges. Dedicated to customer service and the search for innovative product technologies, DieQua provides premium quality shaft couplings including oldham couplings, zero backlash couplings and more.
 
Ameridrives Couplings
Erie, PA
814-480-5000
Began in 1928, Ameridrives Couplings is an international manufacturer of mechanical power transmission products, pioneering many improvements over the years. Complete line of coupling products includes Amerigear gear couplings & spindles, Ameriflex diaphragm couplings, Ameridisc high performance disc couplings & universal joints. We are your single source solution for Driveline Connections.
 
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Industry Information

Oldham Couplings

Oldham couplings are flexible and designed for general purpose use up to 4000 rotations per minute because they have few disadvantages. Their only disadvantages are their limited angular displacement of shafts and their need for lubrication. This type of coupling allows less than half a degree of angular misalignment and less than 0.005 inches of axial motion. The axial motion is limited by the design of the coupling which cannot accommodate push-pull motion. Because the center piece is essentially floating, both shafts must be supported to keep the coupling from coming apart. Their advantages include no velocity variation, high lateral misalignments, high torque capacity and easy disassembly. Oldham couplings are widely used for CNC machines, homokinetic transmission, servo or robotic machines, copy and printing machines and instrumentation.

Oldham couplings function when one hub, or disc, is coupled to the input, while the other is coupled to the output and the center piece is joined to the other two by a series of tongue and grooves. During operation, the center element slides on a hub tenon to accommodate misalignment. This eventually wears down the discs. Springs are often employed to prevent this and worn discs are easily and inexpensively replaced. There are many different kinds of flexible shaft couplings besides Oldham couplings. The bellows coupling has two hubs and a thin walled metallic bellows and can accommodate all three types of misalignment. Single beam couplings are usually made of a single piece of aluminum and have a system of spiral cuts that allow it to bend in order to accommodate angular misalignment. Multiple beam couplings consist of two to three overlapping beams that address problems of torsional rigidity. Jaw, or spider, couplings consist of two metallic hubs, each with a set of interlocking teeth, and a flexible rubber or plastic piece in the shape of a star which fits between them. These couplings have zero backlash and function well at high speeds but do not tolerate a great deal of misalignment.