SWING BEARING AND METHOD OF PROCESSING RACEWAY GROOVE THEREOF

Title:

SWING BEARING AND METHOD OF PROCESSING RACEWAY GROOVE THEREOF

Document Type and Number:

Japanese Patent JP2010281352

Kind Code:

A

Abstract:

To present a relative difference between inter-raceway groove distances which is determined so that the bearing has an extended life achieved to an extent which is cost-wise feasible and does not sacrifice productivity, in a swing bearing having double-row raceway grooves.

The swing bearing has multiple balls 3 interposed between double-row raceway grooves 1a, 1b, 2a, 2b in an inner ring 1 and an outer ring 2. The distance ei between the double-row raceway grooves 1a, 1b in the inner ring 1 or the distance eo between the double-row raceway grooves 2a, 2b in the outer ring 2 is 1 to 1.7 times the diameter Dw of the balls 3, the diameter Dw of the balls is from 30 mm to 80 mm, and the difference Δe between the inter-raceway groove distance ei and the inter-raceway groove distance eo is from 5 μm to 50 μm. The double-row raceway grooves 1a, 1b (2a, 2b) are simultaneously processed by an alundum-based grindstone.

Inventors:

HORI MICHIO
KUWABARA ATSUSHI
YAMAMOTO YOSHIFUMI

Application Number:

JP2009133628A

Publication Date:

December 16, 2010

Filing Date:

June 03, 2009

Export Citation:

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Assignee:

NTN TOYO BEARING CO LTD

International Classes:

F16C19/18; B24B19/06; B24B53/053; F16C33/64

Domestic Patent References:

JP2005172146A	2005-06-30
JP2005299730A	2005-10-27
JP2005147372A	2005-06-09
JPH10156676A	1998-06-16
JPS6384873A	1988-04-15
JPH11165248A	1999-06-22

Foreign References:

WO2006129351A1

2006-12-07

Attorney, Agent or Firm:

Masashi Noda
Shuji Sugimoto

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