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US 6,394,220 B1Granted
Electric power steering device
AssigneeKoyo Seiko Co., Ltd.
InventorsTakanori Kurokawa, Hirokazu Arai
Life of this patent
Estimating the term…
Abstract
An electric power steering device transmits rotation of an electric actuator for generating auxiliary steering power to a wheel via a worm and a worm wheel. The worm wheel is molded from pelletized synthetic resin material. A number average molecular weight of the pelletized synthetic resin material is greater than or equal to 30,000 and less than or equal to 60,000.
Claims4
An electric power steering device for transmitting steering power to a wheel comprising:
- an electric actuator;
- a worm driven by said electric actuator;
- a worm wheel engaged with said worm for transferring steering force from said electric actuator to the wheel, the worm wheel being formed of nylon resin having an average molecular weight greater than or equal to 30,000 and less than or equal to 60,000.
Dependencies are inferred from the claim text.