FORKLIFT HYDRAULIC CONTROL DEVICE

PROBLEM TO BE SOLVED: To excellently operate both operation objects when operating both fork and mast simultaneously.SOLUTION: A flow rate control valve 34 is arranged between a hydraulic pump motor 30 and a lift descending proportional valve 32 to open and close a valve in accordance with a pressur...

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Main Authors MATSUO TSUTOMU, GOTO TETSUYA, UEDA SUKENORI, YAZAWA RYO, FUKATSU TOSHISHIGE, ISHIKAWA HIROHIKO, NAKAJO AKIRA, MORITA JUNICHI
Format Patent
LanguageEnglish
Published 08.07.2013
Subjects
HAULING
HOISTING
HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDEDFOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCEDIRECTLY TO THE SURFACE OF A LOAD
LIFTING
PERFORMING OPERATIONS
TRANSPORTING
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Summary:PROBLEM TO BE SOLVED: To excellently operate both operation objects when operating both fork and mast simultaneously.SOLUTION: A flow rate control valve 34 is arranged between a hydraulic pump motor 30 and a lift descending proportional valve 32 to open and close a valve in accordance with a pressure difference between a pressure P1 between a lift cylinder 14 and a lift descending proportional valve 32 and a pressure P2 between the hydraulic pump motor 30 and the lift descending proportional valve 32, and a flow rate control valve 34 controls a flow rate to the hydraulic pump motor 30 side of the hydraulic oil exhausted from the lift cylinder 14 and a flow rate to a drain (oil tank T) side in response to a difference between a required revolution number of the hydraulic pump motor 30, which is required for performing a descending movement at an instructed speed in response to an operation quantity of a lift lever 22, and an actual revolution number of the hydraulic pump motor 30.
Bibliography:Application Number: JP20110284271