Product category:
Gears, brakes, couplings and engines
News Release from: Abssac | Subject: UJ , GJ and GJK one-piece shaft couplings
Edited by the Engineeringtalk Editorial
Team on 14 February 2000
Lower cost shaft coupling through
plastic moulding
Using the latest injection moulding techniques Abssac is able to supply a low cost one piece, flexible shaft coupling.
Using the latest injection moulding techniques Abssac is able to supply a low cost one piece, flexible shaft coupling Simon Cattle, Managing Director says: "Abssac has long been known for supplying the one piece Helical beam type coupling, produced from Stainless Steel of Aluminium as standard
This article was originally published on Engineeringtalk on 22 Feb 2000 at 8.00am (UK)
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Although we could supply this same product in Delrin (an engineering plastic) we identified a market for a lower cost, lower torque requirement shaft coupling.
The best way to satisfy this demand was to go down the route of injection moulding." The basic design consists of a flexible element within the coupling structure that can absorb parallel, angular and skewed shaft misalignments.
Combining this feature with the most modern plastics materials allows zero backlash torque transmission and excellent performance characteristics.
The UJ , GJ & GJK ranges of coupling supply this demand.
There are three basic models, starting with the TYPE UJ which is characterised by its single flexible element.
This series is capable of transmitting torques up to 8 kg/cm through 8 degrees of angular misalignment.
Typical shaft sizes accepted are 2mm up to 6mm.
The second model is the TYPE GJ which has two flexible elements for greater parallel shaft offset capability.
The plastics composition is also reinforced with glass fibre to give it a higher torque capability.
The glass fibre reinforcement also gives the coupling a higher torsion stiffness making it ideal for use with rotary encoders.
The maximum angular displacement is 12 degrees, with parallel displacements from .03 to 0.5mm and torques from 1.8 to 35kg/cm.
This coupling also offers a degree of overload protection, failing at 1.7 to 2 times its maximum transmission torque.
Finally, TYPE GJK has a greater amount of glass fibre, adding to it's torque capability and torsional stiffness.
This series can compete against aluminium couplings but with considerable cost savings.
With all of the designs, shaft attachment is by two grub screws at each end of the shaft coupling. Request a free brochure from Abssac ...
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