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:
Oct. 25, 2016
Filed:
Apr. 28, 2015
Applicant:
Ntn Corporation, Osaka-shi, JP;
Inventors:
Assignee:
NTN Corporation, Osaka-shi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16H 3/06 (2006.01); F16H 27/02 (2006.01); F16H 29/02 (2006.01); F16H 29/20 (2006.01); F16H 25/22 (2006.01); F16H 25/20 (2006.01);
U.S. Cl.
CPC ...
F16H 25/2204 (2013.01); F16H 2025/204 (2013.01); F16H 2025/2031 (2013.01); F16H 2025/2081 (2013.01); Y10T 74/18576 (2015.01);
Abstract
An electric linear actuator has a housing, an electric motor mounted on the housing, a speed reduction mechanism, and a ball screw mechanism. The ball screw mechanism has a nut and screw shaft. Both have helical screw grooves. The screw shaft is inserted into the nut, via a large number of balls. A sleeve is secured on the housing to prevent rotation of the screw shaft relative to the housing. At least one axially extending recessed groove is formed on the inner circumference of the sleeve. At least one guide pin, mounted on the end of the screw shaft, engages the recessed groove. A tapering chamfered portion is formed on the end of the nut.