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. 24, 2012
Filed:
Dec. 03, 2008
Dong Soo Kim, Jinhae, KR;
Dong Soo Kim, Jinhae, KR;
Volvo Construction Equipment Holding Sweden AB, Eskilstuna, SE;
Abstract
A shock absorption device and a control method thereof for a small swing radius (SSR) excavator are provided, which can relieve shock generated on a boom cylinder by controlling only the discharge flow rate of hydraulic pumps, being supplied to the boom cylinder, even without controlling a main control valve when a boom of the excavator ascends at its maximum height through manipulation of a control level. The shock absorption device for an SSR excavator includes first and second hydraulic pumps, a control lever, a boom cylinder coupled to the first hydraulic pump, a main control valve for controlling a start, a stop, and a direction change of the boom cylinder, a boom-up manipulation amount detection means, a hydraulic pump flow computation means, a boom confluence means for making hydraulic fluid discharged from the first and second hydraulic pumps confluent together, a boom deceleration region detection means for detecting a boom deceleration region, and a flow controller for controlling the discharge flow rate of the first and second hydraulic pumps.