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:
Dec. 16, 2025
Filed:
Jan. 17, 2024
Hamilton Sundstrand Corporation, Charlotte, NC (US);
Edward W. Goy, Crystal Lake, IL (US);
Weishun W. Ni, Loves Park, IL (US);
HAMILTON SUNDSTRAND CORPORATION, Charlotte, NC (US);
Abstract
A shouldered shaft assembly of a variable displacement, bent axis piston pump is provided. The shouldered shaft assembly includes a bearing retainer housing including radially inwardly facing tilt pad bearings and axially facing tilt pad thrust bearings and a shouldered shaft. The shouldered shaft is disposed in the bearing retainer housing and includes a first shaft section, a second shaft section and an axial surface. The second shaft section has a larger diameter than the first shaft section and includes an outer diameter (OD) surface. The OD surface faces and fluid-dynamically interacts with the radially inwardly facing tilt pad bearings. The OD surface is formed to define microscopic surface texturing for increased fluid-dynamic interaction. The axial surface extends between the first shaft section and the second shaft section. The axial surface faces and fluid-dynamically interacts with the axially facing tilt pad thrust bearings.