Windowlift motors installed in 1996 Ford Taurus and Mercury Sable cars are a new design made with seven DuPont polymers. The motor gear housing, injection molded from Zytel® HTN high performance polyamide resin, marks a major shift away from traditional die-cast aluminum housings.
Lighter weight. The new motor weighs 30% less than a traditional design.
Higher efficiency. Torque per unit weight is 30% greater than a typical windowlift motor.
Technical assistance. DuPont technical assistance was very valuable in taking the motor from concept to production, according to Jim Marks, vice president of engineering for UTA Motor Systems.
Materials Selected and Why
Motor gear housing. Zytel® HTN high performance polyamide meets needs for retention of stiffness and strength at elevated temperatures, chemical resistance, low warpage and low shrinkage.
Connector housing. Rynite® PET provides excellent drop impact resistance plus dimensional stability and good dielectric properties.
Armature insulators. Zytel® nylon resin fulfills requirements for durability, electrical insulation and processability.
Window lift gears. Delrin® acetal resin delivers the required combination of resistance to repeated impact, stiffness, moisture resistance and low coefficient of friction.
Thrust plugs. Vespel® polyimide parts at each end of the armature give excellent low-wear performance without lubrication.
Seals. Alcryn® melt-processible rubber was selected for its resistance to compression set and moisture.
Cushioning components. DuPont™ Neoprene® rubber gives excellent shock absorption and tear resistance.