Bearing device, speed reduction mechanism including the bearing device, and motor torque transmission device

  • US 8,827,854 B2
  • Filed: 09/05/2012
  • Issued: 09/09/2014
  • Est. Priority Date: 09/08/2011
  • Status: Active Grant
First Claim
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1. A bearing device, comprising:

  • a rotary shaft that has at least two eccentric portions that are arranged at equal intervals around a rotation axis of the rotary shaft, and that have respective central axes that are spaced apart at equal interval from the rotation axis in a radial direction of the rotary shaft; and

    at least two rolling bearings that include a first rolling bearing and a second rolling bearing, that are respectively arranged on outer peripheries of the at least two eccentric portions of the rotary shaft, and each of which includes a plurality of rolling elements that roll between an inner raceway and an outer raceway and a cage by which the rolling elements are rollably retained at equal intervals around the corresponding central axis, whereinthe cage of each of the at least two rolling bearings has an annular base portion that is interposed between the inner raceway and the outer raceway and a plurality of partition wall portions for forming pockets together with the base portion, andin the first rolling bearing, part of the base portion protrudes axially outward from the inner raceway and forms an oil receiving portion that receives lubricating oil from the second rolling bearing side, at a portion around the rotation axis and axially outward of the first rolling bearing.

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