Molded Polyamide Cover Cuts Weight In Toyota Engine Application

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.

A molded polyamide enclosure (lower left) reduces weight as a power transmission cover. The cam shaft (3) fits through an insert-molded aluminum ring (13). (USPTO)

About Doug Smock

Former Chief Editor at Plastics World and Senior Technical Editor Design News
Asia, Automotive, Design, Green, Insert Molding, Polyamides , ,

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