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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 8844489 B1

PDFFull Text
Date of Patent:
Sep. 30, 2014

Filed:

Feb. 10, 2009

Roller follower, valve train, induction hardening apparatus, method of heat treatment of shaft member, method of manufacturing shaft, and shaft

Applicants:

Takumi Fujita, Kuwana, JP;

Kousuke Obayashi, Iwata, JP;

Inventors:

Takumi Fujita, Kuwana, JP;

Kousuke Obayashi, Iwata, JP;

Assignee:

NTN Corporation, Osaka, JP;

Attorney:

McDermott Will & Emery LLP

Primary Examiner:

Thomas Denion

Assistant Examiner:

Steven D Shipe

Int. Cl.
CPC ...
F01L 1/14 (2006.01); C21D 6/00 (2006.01); F16C 33/62 (2006.01); C21D 9/40 (2006.01); C21D 6/04 (2006.01); F01L 1/16 (2006.01); C22C 38/36 (2006.01); F16C 33/34 (2006.01); F16C 19/46 (2006.01); C21D 1/25 (2006.01); C21D 6/02 (2006.01); F01L 1/18 (2006.01); C23C 8/00 (2006.01); C21D 1/10 (2006.01); C21D 1/42 (2006.01);
U.S. Cl.
CPC ...
F16C 19/46 (2013.01); C21D 6/002 (2013.01); F01L 2101/00 (2013.01); C21D 1/10 (2013.01); F01L 1/14 (2013.01); F01L 2103/00 (2013.01); F16C 33/62 (2013.01); C21D 9/40 (2013.01); C21D 6/04 (2013.01); F01L 1/16 (2013.01); C22C 38/36 (2013.01); F01L 2105/00 (2013.01); F16C 33/34 (2013.01); C21D 1/42 (2013.01); C21D 1/25 (2013.01); C21D 6/02 (2013.01); F01L 2105/02 (2013.01); F01L 1/18 (2013.01);
Abstract

A roller follower includes a roller ring, a shaft and a plurality of rollers. At least one of the roller ring, the shaft and the rollers is a steel member made of steel containing 0.7 to 2.4% carbon and 10.0 to 20.0% chromium, with remainder iron and impurities. In addition, carbide containing at least any one of iron and chromium as well as carbon and having an area of 12.6 μmor greater is generated at an area ratio of 5.0% or higher, at a rolling contact surface of the steel member (a roller ring rolling contact surface, a shaft rolling contact surface and a roller rolling contact surface.

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