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TAPERED ROLLER BEARING

  • US 20150252848A1
  • Filed: 02/25/2015
  • Published: 09/10/2015
  • Est. Priority Date: 03/10/2014
  • Status: Active Grant
First Claim
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1. A tapered roller bearing comprising:

  • an inner ring that has an outer peripheral surface formed as an inner ring raceway surface in a shape of a tapered shaft;

    an outer ring that is concentrically disposed on an outer peripheral side of the inner ring and has an inner peripheral surface formed as an outer ring raceway surface in a shape of a tapered hole;

    a plurality of tapered rollers disposed to be rollable in an annular space between the inner ring raceway surface and the outer ring raceway surface; and

    a cage having a plurality of pockets that hold the respective tapered rollers, wherein the cage includes;

    a large-diameter side annular portion and a small-diameter side annular portion that are disposed in an axial direction with a predetermined space therebetween and form wall portions in both axial ends of the pockets; and

    a plurality of cage bars each extending between the large-diameter side annular portion and the small-diameter side annular portion to connect both end portions of the cage bar and the annular portions , and forming wall portions on both circumferential sides of the pockets, anda pressure difference reducing portion is provided which reduces the difference between a pressure in an inner region including a smallest bore diameter portion of the outer ring raceway surface and a pressure in an outer region including a boundary portion between an outer peripheral surface and an axially outer end surface of the small-diameter side annular portion of the cage.

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