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:
May. 06, 2003
Filed:
Nov. 21, 2000
Kazunori Yoshino, Hyogo Prefecture, JP;
Caterpillar Inc., Peoria, IL (US);
Abstract
A flow amplifying poppet valve is useful in hydraulic circuits requiring low leakage when in a loaded condition. Undesirable pressure fluctuations effect the stability of the poppet. Tilting of the poppet valve within the bore increases friction that degrades repeatability. The subject invention provides a flow amplifying poppet valve that dampens valve oscillation caused by pressure fluctuations and provides for a constant guide length to prevent poppet valve tilting in the bore. The flow amplifying poppet valve assembly comprises a poppet valve slidably disposed within a bore that includes a poppet seat for engaging the valve seat to meter the flow of fluid between the inlet and the outlet. The poppet valve and bore have radially overlapping shoulders movable axially toward and away from each other to define a pressure chamber that accumulates fluid for dampening poppet valve oscillation.