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, 2004
Filed:
Mar. 12, 2003
David Y. Chang, Savoy, IL (US);
Caterpillar Inc, Peoria, IL (US);
Abstract
A velocity control system for an engine valve is provided. The system includes a valve having a housing defining an opening, a chamber adapted to receive a fluid, a first fluid passageway connecting the opening with the chamber, a second fluid passageway connecting the opening with the chamber, and a third fluid passageway connecting the opening with the chamber. A piston is slidably disposed in the chamber and is moveable from a first position to a second position. The movement of the piston from the first position to the second position forces fluid from the chamber at a first flow rate during movement of the piston through a first travel distance and at a second flow rate during movement of the piston through a second travel distance. The first flow rate is greater than the second flow rate. A check valve is adapted to prevent fluid from flowing from the chamber through the first fluid passageway when the piston is moving from the first position to the second position.