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.:
Date of Patent:
Mar. 22, 2016
Filed:
Oct. 30, 2009
Applicants:
Koji Tateishi, Iwata, JP;
Hirakazu Yoshida, Iwata, JP;
Inventors:
Koji Tateishi, Iwata, JP;
Hirakazu Yoshida, Iwata, JP;
Assignee:
NTN Corporation, Osaka-shi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16H 25/20 (2006.01); B23B 27/06 (2006.01); B23P 15/00 (2006.01); C21D 1/06 (2006.01); C21D 7/06 (2006.01); C21D 9/40 (2006.01); C23C 8/22 (2006.01); F16C 29/06 (2006.01); F16C 33/64 (2006.01); F16H 55/22 (2006.01); F16H 25/24 (2006.01);
U.S. Cl.
CPC ...
B23B 27/065 (2013.01); B23P 15/003 (2013.01); C21D 1/06 (2013.01); C21D 7/06 (2013.01); C21D 9/40 (2013.01); C23C 8/22 (2013.01); F16C 29/0688 (2013.01); F16C 33/64 (2013.01); F16H 55/22 (2013.01); F16H 2025/2481 (2013.01); Y10T 29/49881 (2015.01); Y10T 74/19744 (2015.01);
Abstract
A ball screw has a nut formed with a helical ball rolling groove on its inner circumference. A screw shaft is formed with a helical ball rolling groove on its inner circumference. The screw shaft is inserted into the nut. A number of balls are rollably contained within a ball rolling passage formed by oppositely arranged helical ball rolling grooves of the nut and the screw shaft, respectively. The nut is made of case hardened steel. The ball rolling groove is formed by cutting and surface hardening, by vacuum carburizing hardening, without any after-processing.