The technique eliminates the risk of producing loose particles that might contaminate the oil.
The tube made of DuPont Zytel nylon carries oil from the filter to the Volkswagon's six-speed direct-shift gearbox. A ring of heat and oil-resistant DuPont Vamac ethylene acrylic elastomer seals the tube from the gearbox. The oil handles temperatures of -40 to + 140 ° C and is reinforced with 30 % glass fiber.
IBS divided the tube into separate parts; one part is made of laser-absorbent variant of Zytel 70G30 HSLR and can be molded in a tool with a single parting line. On the open areas laser-welds two other injection-molded tops of the same nylon but using a laser-transparent variant. The weld-seam is precisely defined and air and oil-tight. Because the process does not involve oil contact surfaces, there is no danger that particles of the plastic material could come loose and enter the oil-stream.
a href="http://www.dupont.com" target="_blank">DuPont
This web-only article appeared in the Fastening & Joining e-mail newsletter. If you enjoyed this article and would like to read similar articles sign up today for our free e-mail newsletters!