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:
Aug. 03, 1999
Filed:
Apr. 28, 1997
Stephen F Glassey, Ft. Morgan, CO (US);
Richard H Holtman, Dunlap, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A precision demand axial piston pump with at least one spring for reducing cavitation. The pump includes a drive shaft driven to rotate about a drive axis of rotation. A cylinder block is connected disposed within a casing and is to rotate with the drive shaft and defines a plurality of cylindrical bores arranged parallel to a block axis of rotation. A fixed angle swash plate is positioned adjacent the cylinder block. A valve plate is mounted adjacent the cylinder block and defines an inlet passage and an outlet passage for fluid communication. A plurality of pistons, each having a shoe end, connected to a shoe, and a pressure face end, are slidably received in one of the cylindrical bores. The fixed angle swash plate provides the method for reciprocating the pistons with each revolution of the cylinder block. A throttle valve is positioned to control flow volume through the inlet passage and the pump. The springs have insufficient strength to push the shoe into contact with the swash plate when each of the pistons passes the inlet passage and the throttle valve is partially closed.