Product category:
Gears, brakes, couplings and engines
News Release from: Abssac | Subject: UJ, GJ and GJK flexible shaft couplings
Edited by the Engineeringtalk Editorial
Team on 19 July 2000
Low cost one-piece shaft coupling now in
plastic
Using the latest injection moulding techniques Abssac is able to supply a low cost one piece, flexible shaft coupling in modern plastics materials
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 style 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.
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Using the latest injection moulding techniques Abssac is able to supply a low cost one piece, flexible shaft coupling.
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The UJ, GJ and 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 it's 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.
Basic key points to product range; - Light Duty, Low Maintenance - Material: Polyacetal Resins - Max'Angular Shaft Misalignment Capability: 3 to 5 degrees - Max'Parallel Shaft Misalignment Capability: dependant on model - Max' Axial Motion from .15 to 0.6mm depending on model - Bore sizes from 2mm to 12mm (0.078inch to 0.472inch) - Integral Set Screw shaft attachment design - Provides thermal and electrical insulation between shafts. Request a free brochure from Abssac ...
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