Tapered roller bearing

Patent metadata

Field	Value
Publication number	US-9453534-B2
Application number	US-201414763223-A
Country	US
Kind code	B2
Filing date	Jan 23, 2014
Priority date	Jan 25, 2013
Publication date	Sep 27, 2016
Grant date	Sep 27, 2016

Abstract

A cage 20 of a tapered roller bearing 1 holds tapered rollers 30 by plural pockets formed between a large-diameter side annular part 22 and a small-diameter side annular part 23 arranged in an axial direction, and plural bar parts 24 which axially join the large-diameter side annular part 22 and the small-diameter side annular part 23 and are circumferentially formed at substantially an equal distance. A value of a ratio of a cross section modulus of the small-diameter side annular part 23 of the cage 20 to a cross section modulus of the large-diameter side annular part 22 of the cage 20 is values from 0.5 to 1.5 (both inclusive).

First claim

The invention claimed is:

1. A tapered roller bearing comprising:
an inner ring having a small rib in a small-diameter side, the inner ring whose outer peripheral surface is formed with a conical inner ring raceway surface,
an outer ring whose inner peripheral surface is formed with a conical outer ring raceway surface,
plural tapered rollers rollably circumferentially arranged between the inner ring raceway surface and the outer ring raceway surface, and
a cage for holding the tapered rollers by plural pockets formed between a large-diameter side annular part and a small-diameter side annular part arranged in an axial direction, and plural bar parts which axially join the large-diameter side annular part and the small-diameter side annular part and are circumferentially formed at substantially an equal distance,
wherein a value of a ratio of a cross section modulus of the small-diameter side annular part of the cage to a cross section modulus of the large-diameter side annular part of the cage is within range from 0.5 to 1.5 (both inclusive).

2. The tapered roller bearing according to claim 1 , wherein the small-diameter side annular part of the cage has a curved part with a curved shape extending to a radial inside in a direction away from the bar part, and
the curved part is configured to be short such that a radial distal end of the curved part does not reach a central axis of the tapered roller in a radial inside direction.

3. The tapered roller bearing according to claim 1 , wherein arithmetic average roughness Ra of a rolling surface of the tapered roller is 0.05 μm or less.

Assignees

• Nsk Ltd

Inventors

• Ushimaru Satoshi
• Murai Takashi

Classifications

• F16C33/6614

  in recesses or cavities provided in retainers, races or rolling elements · CPC title

• F16C33/54

  made from wire, strips, or sheet metal (F16C33/48, F16C33/49 take precedence) · CPC title

• F16C33/366

  Tapered rollers, i.e. rollers generally shaped as truncated cones · CPC title

• F16C33/6651

  in recesses or cavities provided in retainers, races or rolling elements · CPC title

• F16C19/36

  with a single row of rollers · CPC title