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New igus elastic double joint from Treotham lasts longer

15-03-2021
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GPZM coupling joint
The new igus GPZM coupling joint is not only particularly low-maintenance and lubrication-free, but also prevents the penetration of dirt by the use of a new flexible material.

Coupling joints are exposed to various types of load, such as permanent vibrations, edge loads, high tensile forces and compressive strength. The demands on the material used are extremely high. With the igubal GPZM coupling joint, the motion plastics specialist is now presenting a double joint that is not only lubrication-free and maintenance-free, but also 20% more flexible than the conventional solution thanks to a new housing material. This firmly encloses the ball stud, prevents the penetration of dirt and increases the dependability of the moving application.

Spherical bearings made of tribologically optimised polymers are already used in many industries today, the agricultural industry as well as machine and plant construction among them. In the automotive industry alone, the variety of application areas is extremely large: from sensor connections, actuators, valve flaps, shift levers to turbochargers – almost any application of metallic coupling joints can also be implemented with the tribo-polymer version. Light weight, use at temperatures up to 300oC, corrosion resistance and long service life speak for themselves, as do the 40% lower costs when using igubal coupling joints. They are maintenance-free due to the incorporated dry lubrication; no external lubricants are necessary. This also applies to the new GPZM double joint.

The double joint is extremely flexible and at the same time resilient. Tests in the 3,800m2 igus laboratory showed a 25% higher elasticity of the RN283 material compared to the standard material igumid G. The housing material ensures that the ball stud is tightly enclosed in the movement so that it is sealed against the ingress of dust and dirt. Liquefied dust was injected in the test; this contamination has no negative influence on the function due to the elastic material. The abrasion resistance of the metal ball studs was also tested in the laboratory. The result convinced the igus designers: with a coefficient of wear that is 20 times better than polyamide, the new TPU material prevailed over polyamide and ensures significantly increased dependability in movement.

The GPZM coupling joint and other igus products are available from Treotham Automation.

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