To provide a crawler tension adjustment device used in a large construction machine to which a large reaction force is applied from a crawler and capable of automatically adjusting tension of the crawler.SOLUTION: A crawler tension adjustment device 10 for a construction machine includes: a high-pressure hydraulic cylinder 20 highly resistant to pressure in a shrinking direction; and a hydraulic operation path 40 connected to a hydraulic fluid path 30 of the lower traveling body and capable of supplying and discharging the hydraulic fluid to and from the high-pressure hydraulic cylinder. Pressure resistance of the high-pressure hydraulic cylinder and the hydraulic operation path is higher than pressure resistance of the hydraulic fluid path. The hydraulic operation path includes: a supply path 40a through which the hydraulic fluid is supplied from the hydraulic fluid path to the high-pressure hydraulic cylinder; a discharge passage for discharging hydraulic fluid from the high-pressure hydraulic cylinder to the hydraulic fluid path; and a high-pressure switching valve 41 configured to control the flow of the hydraulic fluid for switching between supply and discharge of the hydraulic fluid to the high-pressure hydraulic cylinder; and a high-pressure check valve 42 disposed at a downstream side of the high-pressure switching valve in the supply path to prevent back flow of the hydraulic fluid from the high-pressure hydraulic cylinder.SELECTED DRAWING: Figure 2
【課題】クローラからの反力が大きい大型建設機械に用い、クローラの張り具合を自動調整可能なクローラ張り調整装置を提供する。【解決手段】建設機械のクローラ張り調整装置10であって、縮む方向の耐圧が高い高圧油圧シリンダ20と、上記下部走行体の作動油径路30に接続され、上記高圧油圧シリンダに作動油を供給及び排出可能な油圧作動径路40とを備え、上記高圧油圧シリンダ及び上記油圧作動径路の耐圧が上記作動油径路の耐圧より高く、上記油圧作動径路が、上記作動油径路から上記高圧油圧シリンダに作動油を供給する供給路40aと、上記高圧油圧シリンダから上記作動油径路に作動油を排出する排出路と、上記高圧油圧シリンダへの作動油の供給及び排出を切替えるべく作動油の流れを制御する高圧切替弁41と、上記供給路上で上記高圧切替弁より下流側に配設され、上記高圧油圧シリンダからの作動油の逆流を抑制する高圧逆止弁42とを有する。【選択図】図2
CRAWLER TENSION ADJUSTMENT DEVICE, LOWER TRAVELING BODY, AND CONSTRUCTION MACHINE
クローラ張り調整装置、下部走行体及び建設機械
2023-04-03
Patent
Electronic Resource
Japanese
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