Product category:
Gears, brakes, couplings and engines
News Release from: Ruland Manufacturing Co | Subject: Jawflex
Edited by the Engineeringtalk Editorial
Team on 29 August 2003
No backlash from three-piece jaw
couplings
Jawflex zero backlash jaw couplings are three-piece couplings composed of two hubs and an elastic element.
Jawflex zero backlash jaw couplings are three-piece couplings composed of two hubs and an elastic element The spider, made of an advanced polyurethane material, provides dampening of impulse type loads, minimising shock to the motor and other sensitive equipment
This article was originally published on Engineeringtalk on 15 Jul 2003 at 8.00am (UK)
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Beam couplings accommodate misalignment
Beam-style couplings are one-piece aluminium or stainless-steel components, which incorporate spiral cuts to accommodate angular misalignment, parallel misalignment and axial motion.
The "third way" to rigid couplings
Nomar rigid shaft couplings are available in a three-piece design by special order.
Available in two hardness levels, these spiders allow the end user to customise the jaw couplings performance.
Selecting a soft spider element (yellow) will give the Jawflex the greatest dampening characteristic, whereas a hard spider element (red) will provide the greatest in torsional rigidity.
All spiders are press fit onto a curved jaw profile; generous chamfers on the spiders and jawed hubs make this assembly easy.
Because of this press fit, the Jawflex coupling is considered zero backlash.
This would not be possible without the special design of the curved jaw profile.
In standard jaw couplings, the jaws have a straight profile, and a pressed fit would result in distortion of the elastic element as forces push the spider's "limb" out.
With a curved jaw profile, forces on the spider's "limb" are concentrated to the centre, improving the effectiveness of the elastomer material.
Standoffs, located on the spider "limbs", assist in angular misalignment capabilities, as well as electrical isolation.
Jaw couplings are considered fail safe: should the spider element ever fail, the jaws on the hubs provide a direct power transmission, allowing the application to safely shut down, after which the spider can easily be replaced.
The couplings are available from stock in a choice of seven outside diameters from 15 to 57.2mm in both set screw style and Nomar clamp style.
A large variety of metric and inch bore sizes from 3 to 30mm are available.
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