REDUCTION GEAR, AND ELECTRIC POWER STEERING DEVICE

PROBLEM TO BE SOLVED: To provide a reduction gear capable of elongating a service life of a worm wheel by suppressing temperature rise of a tooth surface caused by friction by properly reducing a frictional coefficient in sliding between tooth surfaces by lubrication with an oil film, as a continuou...

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1. Verfasser: NAKADA RYUJI
Format: Patent
Sprache:eng
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a reduction gear capable of elongating a service life of a worm wheel by suppressing temperature rise of a tooth surface caused by friction by properly reducing a frictional coefficient in sliding between tooth surfaces by lubrication with an oil film, as a continuous oil film can be formed between the tooth surfaces of a worm and the worm wheel by surely preventing grease shortage only by applying a small amount of grease without complicating a structure, and to provide an electric power steering device having low steering torque and having high operation feeling.SOLUTION: A reduction gear 48 includes: a worm 11 and a worm wheel 12 engaged with each other; and a housing 5 accommodating the worm and the worm wheel, and is filled with grease having a viscosity of 0.3 Pa s or more and 2 Pa s or less at 100°C in a shear rate of 100 s. An electric power steering device includes: the reduction gear 48.