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:
Jul. 12, 1977
Filed:
Mar. 06, 1975
Robert J Huebner, Peoria, IL (US);
Caterpillar Tractor Co., Peoria, IL (US);
Abstract
In order to reduce noise within a hydraulic pump of a type having a cylinder barrel defining a plurality of piston bores with the cylinder barrel being rotatable relative to a cylinder head having a valve face for periodically communicating the piston bores with inlet and outlet ports, the valve face is designed to provide overlapping alignment of each piston bore with the inlet passage at a bottom dead center position, subsequent communication of the bore with the outlet port being initiated by a bleed slot. Additionally, the valve face is configured for developing increased clamping engagement between the cylinder barrel and cylinder head by selective communication of each bore with the outlet and inlet ports at a top dead center position. The valve face configuration improves lubrication of the pistons.