CRANE

To provide a crane capable of obtaining a stable turning characteristic.SOLUTION: A crane comprises: an engine (10); a main pump (11) driven by the engine; a hydraulic motor (20) for turning driven by a pressure oil discharged by the main pump; a directional control valve (15) operated by an operati...

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Bibliographic Details
Main Author MITSUYOSHI KOTA
Format Patent
LanguageEnglish
Japanese
Published 07.10.2021
Subjects
CRANES
HAULING
HOISTING
LIFTING
LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS,WINCHES, OR TACKLES
PERFORMING OPERATIONS
TRANSPORTING
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Summary:To provide a crane capable of obtaining a stable turning characteristic.SOLUTION: A crane comprises: an engine (10); a main pump (11) driven by the engine; a hydraulic motor (20) for turning driven by a pressure oil discharged by the main pump; a directional control valve (15) operated by an operation of an operation device (35) to control a flow direction of the pressure oil supplied to the hydraulic motor for turning from the main pump; and a flow regulating valve (17) for adjusting the flow rate of the pressure oil supplied to the directional control valve from the main pump so that a differential pressure before and after the directional control valve approaches a preset target value. The crane changes the target value in accordance with the amount of the operation of the operation device regardless of an engine speed.SELECTED DRAWING: Figure 2 【課題】安定した旋回特性を得ることができるクレーンを提供すること。【解決手段】エンジン（１０）と、エンジンにより駆動されるメインポンプ（１１）と、メインポンプから吐出される圧油により駆動される旋回用油圧モータ（２０）と、操作装置（３５）の操作により作動し、メインポンプから旋回用油圧モータへ供給される圧油の流れ方向を制御する方向制御弁（１５）と、方向制御弁の前後差圧が予め設定された目標値に近づくように、メインポンプから方向制御弁に供給される圧油の流量を調節する流量調節弁（１７）と、を備えたクレーンにおいて、エンジンの回転数に関わらず、操作装置の操作量に応じて目標値を変更する。【選択図】図２
Bibliography:Application Number: JP20200055475