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Title:
TAPERED ROLLER BEARING
Document Type and Number:
WIPO Patent Application WO/2019/189169
Kind Code:
A1
Abstract:
Provided is a tapered roller bearing that has excellent seizure resistance, a long service life, and high durability. In this tapered roller bearing, at least any one of an outer ring (11), an inner ring (13), or a plurality of tapered rollers (12) includes a nitrogen-enriched layer (11B, 12B, 13B). An oil retention hole (14A) is formed in a large annular part (107) of a retainer (14). When a set curvature radius of a large end face (16) of the tapered roller (12) is denoted by R, and the distance from a point serving as the apex of the cone angle of the tapered roller (12) to a large flange surface (18) of the inner ring (13) is denoted by RBASE, the value of the ratio R/RBASE of the set curvature radius R and the distance RBASE is 0.75-0.87. When the actual curvature radius of the large end face (16) of the tapered roller (12) after grinding is denoted by Rprocess, the ratio Rprocess/R of the actual curvature radius Rprocess and the set curvature radius R is 0.5 or more.

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Inventors:
ISHIKAWA, Takanori (1578 Higashikaizuka, Iwata-sh, Shizuoka 10, 〒4388510, JP)
KAWAI, Takashi (1578 Higashikaizuka, Iwata-sh, Shizuoka 10, 〒4388510, JP)
FUJIKAKE, Yasuhito (1578 Higashikaizuka, Iwata-sh, Shizuoka 10, 〒4388510, JP)
MIYAIRI, Susumu (1578 Higashikaizuka, Iwata-sh, Shizuoka 10, 〒4388510, JP)
Application Number:
JP2019/012837
Publication Date:
October 03, 2019
Filing Date:
March 26, 2019
Export Citation:
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Assignee:
NTN CORPORATION (3-17, Kyomachibori 1-chome Nishi-ku, Osaka-sh, Osaka 03, 〒5500003, JP)
International Classes:
F16C19/36; F16C33/36; F16C33/46; F16C33/58; F16C33/64
Foreign References:
JP2008121706A2008-05-29
JP2001241446A2001-09-07
JP2000257637A2000-09-19
JP2000170774A2000-06-20
Attorney, Agent or Firm:
FUKAMI PATENT OFFICE, P.C. (Nakanoshima Festival Tower West, 2-4 Nakanoshima 3-chome, Kita-ku, Osaka-sh, Osaka 05, 〒5300005, JP)
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