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Designers of an innovative electronic park lock solenoid relied on DuPont's (Wilmington, DE) Delrin brand acetal resin to reduce assembly costs by eliminating fasteners. The manufacturer, Pontiac Coil Inc. (Clarkston, MI), supplies the device to automotive manufacturers.
Mounted in an automobile steering column, the electronic park lock solenoid prevents the ignition from being turned off unless the transmission is in the park position.
The device contains four parts--an override arm, a case consisting of a base and cover, and a disk pressed on the armature pin to engage the override arm and its positioning spring. The parts are molded from Delrin.
"Delrin gives us the toughness, resilience and strength needed for reliable snapfits for quick assembly without additional fasteners," says engineer Charles Crane. Delrin also provides lubricity and smooth surfaces required for parts that slide against each other.
The cover incorporates integral features that position the arm. The base has a receptacle shell and a cylindrical feature that holds the override arm. A boss, a snap and locking ...
Source: HighBeam Research, Park lock needs no fasteners. (Assembly in Action).