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. 04, 1997
Filed:
Apr. 18, 1996
Applicant:
Inventor:
David J Beatty, Normal, IL (US);
Assignee:
Caterpillar Inc., Peoria, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04B / ;
U.S. Cl.
CPC ...
417269 ; 92 57 ;
Abstract
A variable displacement pump has a fluid passageway formed through a swash plate fluidly communicating a piston chamber with a drive shaft chamber not later than when the piston chamber comes into open fluid communication with a valve blcok resident inlet port to prevent erosion of the swash plate and the valve block about the inlet port. Secondary port portions of reduced flow area per unit rotation communicate with and circumferentially lead primary port portions of greater flow area per unit rotation.