The Most Common Motor Coupling On The Market

First Quality ~ First Time

Apparatus Repair & Engineering, Inc.

A.R.&E. is the Premier Electric Motor Sales, Service, and Repair facility in the quad-state region of Maryland, Pennsylvania, West Virginia, and Virginia. This business began in 1927, and we are proud to continue the efforts of the founding partners who have served the local Commercial and Industrial markets over these many years. Times have changed in the many years since the inception of this business, and A.R.&E. is growing and changing with the times. Today the use of AI, computers, and factory automation is necessary for businesses to remain competitive in the global market, and A.R.&E. is here to assist with those challenges. And we promise our work will be... First Quality ~ First Time.

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Fabrication Capabilities

This is an example of an automated oil dispensing tank and pump system that was totally designed and built by A.R.&E. for a local manufacturer...

Emergency Generator Installation

Here's what an emergency generator installation can look like when Apparatus Repair & Engineering, Inc. is involved...

Metalizing

Sometimes it's necessary to "buildup" a metal surface that's been damaged by wear. Metalizing is one method of doing just that...

Rewinding

Total rewind of a customer's electric motor. Sometimes, though no one's fault, an electric motor "burns up." That's when our rewind department shines. Here's the technician is rewinding this small motor, and in a couple of hours it'll be "as good as, (or better than) new"...

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Service to our customers is extremely important. Sometimes you just can't remove a piece of equipment and bring it to the shop for repair. And don't forget our ability to remove and reinstall equipment when you just don't have the time or personnel to do it...

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Jaw Couplings

Jaw Couplings

The paragraph below is copied from "Wikipedia" and serves as a reasonably complete and accurate description of couplings, in general, and the Jaw Coupling, specifically.

"A Jaw Coupling is a type of general purpose power transmission coupling that also can be used in motion control (servo) applications. It is designed to transmit torque (by connecting two shafts) while damping system vibrations and accommodating misalignment, which protects other components from damage. Jaw couplings are composed of three parts: two metallic hubs and an elastomer insert called an element, but commonly referred to as a "spider". The three parts press fit together with a jaw from each hub fitted alternately with the lobes of the spider. Jaw coupling torque is transmitted through the elastomer lobes in compression.

The elastomer of the spider can be made in different materials and hardness, which allows the user to customize the coupling to best serve their application. Considerations for elastomer selection include ability to dampen vibration, ability to handle misalignment, operational temperature range, speed of equipment, and chemical conditions.

Jaw couplings are considered "fail-safe" because, should the elastomer fail or wear away, the jaw coupling hub teeth will mate, much like teeth on two gears, and continue to transmit torque. This may or may not be desirable to the user depending on the application.

Jaw couplings elastomers are wearing elements that do need to be inspected and replaced. Jaw coupling elastomers often have signature wear patterns, and failures can often be root caused based on the condition of the elastomer and hubs. Common failure causes include misalignment, over-torque, chemical exposure, temperature exposure, torsional vibrations, and hub failure.

Jaw couplings are available in both straight tooth jaw and curved jaw design. The straight tooth design enables elastomers to be attached and removed radially, including a "not fail-safe" jaw elastomer in-shear design. For the elastomer in-shear design, the coupling hub teeth are no longer inter-meshed, so an elastomer failure will result in no torque being transmitted. When used with a stiff elastomer, the curved jaw design can maintain a zero-backlash fit required for many motion control applications.

Zero-backlash curved jaw couplings are best suited for applications that rely on a stop-and-go type of movement, where accuracy needs to take place upon stopping in order to perform any number of precision tasks, such as taking a high resolution picture (machine visionsystem). Absorbing vibrations decreases the settling time the system needs, which increases through-put. The curved jaw coupling is less suited for applications that rely on a constant scanning type of motion, where accuracy is required during movement, which requires a torsionally stronger coupling.

Like other flexible couplings, jaw couplings are limited in the shaft misalignment that they can accommodate. Too much axial motion will cause the couplings to come apart, while too much angular or parallel misalignment will result in bearing loads that may lead to premature system wear or failure.

With its damping capability, interchangeable spiders, and wide variety of custom options, jaw couplings make a great solution for shock absorption and torque transmission in many applications."

 

One of the simplest, and least complex type of coupling, is the Jaw Coupling. It gets it's name from the shape of the mating pieces.

These couplings are heavily used in industry because of their simplicity, their cost, and their flexibility. In addition, they are found in numerous sizes from tiny sub-fractional capacity to massive, multi-horsepower behemoths rated at upwards of 4000HP @ 1750RPM (according to one manufacturer).

So depending on your actual application, A.R.&E. can assist you in the proper selection of a Jaw Type Coupling, if that's best, and supply it for you when you're ready to purchase.