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. 07, 1998
Filed:
Dec. 28, 1994
Edward H Phillips, Troy, MI (US);
Techco Corporation, Southfield, MI (US);
Abstract
Methods and devices for reducing instability in hydraulic systems are disclosed. A flow control device having an output fitting and a spring-biased piston reciprocally movable in a cylinder past a bypass hole is disclosed. The improvement consisting of metering passages formed in a flow control device to provide hydraulic resistance to dampen the piston. Alternatively, disclosed is a flow control piston having a valving sub-assembly which is resiliently biased. The valving sub-assembly is movable to substantially suppress the flow rate ripple by bypassing a dominant portion of the flow rate ripple. Finally, methods for dampening the resonance, creating resistance, as well as bypassing the flow rate ripple are disclosed.