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:
Nov. 01, 2016
Filed:
Dec. 04, 2013
Applicant:
Hartmann Controls, Inc., Hartland, WI (US);
Inventor:
Donald G. Bethke, Bonita Springs, FL (US);
Assignee:
Hartmann Controls, Inc., Hartland, WI (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04B 1/20 (2006.01); F04B 1/12 (2006.01); F04B 39/00 (2006.01);
U.S. Cl.
CPC ...
F04B 1/2007 (2013.01); F04B 1/126 (2013.01); F04B 1/2078 (2013.01); F04B 1/20 (2013.01); F04B 39/0027 (2013.01);
Abstract
An axial piston pump includes a housing with a cover plate assembly, a rotor with reciprocable pistons rotatably mounted with a drive shaft and a swashplate assembly tiltably mounted relative to the drive shaft and engaged with outer ends of the pistons. A holddown spring is incorporated within the swashplate assembly and positioned outside the rotor such that the holddown spring tilts with the swashplate assembly and does not rotate with the drive shaft. The holddown spring applies a force holding the piston outer ends against the swashplate assembly and the rotor against the cover plate assembly.