Fasteners and Sealing
Fig. 4. The fasteners get coated, for instance, using the dip and centrifuge process. Photo courtesy Dörken MKS-Systeme GmbH & Co KG.
Subsequently a new form of post-lubrication with multifunctional properties is applied using Delta-Lube 10. The material has been specifically designed for mass-produced parts that are assembled using automatic bolting systems. It produces a dry lubricant coat and ensures constant overall coefficients of friction with a value based by MAN on the VDA range of between 0.09 and 0.14µg. For the user that means predictable and – in relation to tightening torque and clamping force – reproducible results and shorter assembly times. The post-lubrication also gets applied by the dip spin process or spin coating and then gets dried for c. 15 to 20 minutes at 50°C to 60°C. In order to reliably identify the newly coated parts, the new post-lubrication has a greenish colour.
The new coating structure has now been approved by MAN as part of the MAN 183 company norm. Key factors for this global player in the commercial vehicles industry were not just the technical features of the solution, but also Dörken MKS Systems’ global presence through local subsidiaries and the application of the products by licensed coating companies, which using co-ordinated application techniques achieve the same high quality of coating results all over the world. l
Enter 36 or ✔ at
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Rudolf Knott, Central Engineering Division, MAN Truck & Bus A, and Dr Jochen Schneider, Customer Service, Dörken MKS- Systeme GmbH & Co KG, Herdecke, Germany.
www.doerken-mks.de
Diverting shaft currents away from the bearings
across multiple industries. As a result, the use of variable frequency drives (VFDs) has increased significantly due to their ability to effectively match motor speeds to load requirements – making them more energy efficient and able to generate significant energy cost savings. While VFD systems provide many
W
benefits, they can also contribute to unplanned downtime. By their nature, VFD systems induce high frequency voltages that travel down the shaft seeking a path to ground. These harmful shaft currents will discharge through the motor’s bearings or the bearings of coupled equipment, damaging the bearings and leading to
36
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ith energy costs on the rise, energy efficient technologies have become a primary focus
premature bearing failure and expensive downtime. Various shaft-
grounding methods have been developed in an attempt to protect the bearings from premature failure. The latest development in shaft grounding technology is the Inpro/Seal Current Diverter Ring (CDR). Utilising proprietary conductive filaments, the CDR safely diverts shaft currents away from the bearings by providing a low impedance path to ground – extending equipment
life and decreasing maintenance. The Inpro/Seal Motor Grounding Seal (MGS) is designed for total bearing protection on severe duty applications; this unique technology protects against stray shaft currents and harmful contamination ingress. l
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Inpro/Seal is based in Rock Island, IL, US, and Glasgow, UK.
www.inpro-seal.com
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