PROBLEM TO BE SOLVED: To provide a hydraulic drive device disposed in a working machine including an engine and an exhaust gas treatment device for detoxicating nitrogen oxide in an exhaust gas using a reducer, capable of securing a function of an engine controller for restricting an engine output while preventing sudden engine stop due to the restriction.SOLUTION: A hydraulic drive device includes a variable displacement type hydraulic pump 52 that is driven by an engine 10 to discharge a hydraulic oil, a hydraulic actuator 54 that receives supply of the hydraulic oil from the hydraulic pump 52 to move a driven element, and a pump displacement control portion 40 that controls a pump displacement of the hydraulic pump 52. The pump displacement control portion 40 restricts the pump displacement of the hydraulic pump 52 according to output of the engine 10 restricted by an engine controller.SELECTED DRAWING: Figure 2

    【課題】エンジン及びその排ガス中の窒素酸化物を還元剤を用いて無害化する排ガス処理装置を備えた作業機械に設けられる油圧駆動装置であって、エンジン出力を制限するエンジンコントローラの機能を確保しながらその制限に起因する突然のエンジン停止を防ぐものを提供する。【解決手段】油圧駆動装置は、エンジン10により駆動されることにより作動油を吐出する可変容量型の油圧ポンプ52と、油圧ポンプ52からの作動油の供給を受けて駆動対象要素を動かす油圧アクチュエータ54と、油圧ポンプ52のポンプ容量を制御するポンプ容量制御部40と、を備える。ポンプ容量制御部40は、エンジンコントローラによりエンジン10の出力が制限されるのに伴って油圧ポンプ52のポンプ容量を制限する。【選択図】図2


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    Title :

    HYDRAULIC DRIVE DEVICE OF WORKING MACHINE


    Additional title:

    作業機械の油圧駆動装置


    Contributors:

    Publication date :

    2017-06-01


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    F02D CONTROLLING COMBUSTION ENGINES , Steuern oder Regeln von Brennkraftmaschinen / B66C Krane , CRANES / E02F Baggern , DREDGING / F01N GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL , Schalldämpfer oder Auspuffvorrichtungen für Gase von Kraft- und Arbeitsmaschinen oder von Kraftmaschinen allgemein / F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein



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