Electric power steering apparatus

Details Electric power steering apparatus Electric power steering apparatus

2008-05-20

2008-05-20

Hurley, Kevin (Department: 3611)

Motor vehicles

Steering gear

With electric power assist

C074S459500

Reexamination Certificate

active

11157151

ABSTRACT:
An electric power steering apparatus comprises a steering assisting electric motor having an output shaft and a speed reduction mechanism. The speed reduction mechanism includes conical first and second gears to be engaged with each other. The first and second gears include a plurality of teeth each having a tooth surface. The mutually corresponding tooth surfaces of the first and second gears each include engaging regions to be engaged with each other. A center position in a tooth width direction of the engaging region of each tooth surface of the first gear in an unloaded state is offset by a first offset amount from center position in the tooth width direction of the tooth surface of the first gear to a relatively small end portion of the tooth of the first gear. A center position in a tooth width direction of the engaging region of each tooth surface of the second gear in an unloaded state is offset by a second offset amount from a center position in the tooth width direction of the tooth surface of the second gear to a relatively small end portion of the tooth of the second gear.

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Donno De M et al.: “Computerized Design, Generation and Simulation of Meshing of a Spiroid Worm-Gear Drive With a Ground Double-Crowned Worm” Transactions of the ASME Journal of Mechanical Design, American Society of Mechanical Engineers, New York, NY, US, vol. 121, No. 2, Jun. 1999, pp. 264-273, XP000901109.

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