Japanese and European car manufacturers continue to push hard for automotive lightweighting.
In a recent example, Toyota has developed an improved method of covering a power transmission timing belt with a complicated plastic enclosure. The timing belt transmits the power from a crank shaft to a cam shaft. The molding is particularly tricky because it holds an oil-sealing gasket that creates problems of heat, pressure and creep.
A metal piece is insert molded into the structure to accept the cam shaft and oil seal.
A U.S. patent application published this week indicates polyamide would be used for the cover and an aluminum alloy for the metal piece.