A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
To provide a hydraulic drive unit capable of supplying a suitable hydraulic fluid on the occurrence of slippage of a traveling body of a work machine.SOLUTION: A hydraulic drive unit includes: a specific work actuator 27 for making a work arm perform traveling assist movement in the slippage; first and second traveling motors 25R, 25L; first and second hydraulic pumps 31, 32; a travel switching valve 39 capable of switching between a neutral position PN and a straight traveling position PS; a communication throttle 39b provided at a communication path for bringing a work oil passage into communication with a traveling oil passage in the straight traveling position; and a switching control unit 50 for switching the travel switching valve 39 to the neutral position PN in the single operation, and switching the travel switching valve 39 to the straight traveling position PS in the specific compound operation when the advance traveling operation and the specific work operation are carried out simultaneously. The switching control unit 50 adjusts an opening of the communication throttle 39b so as to reduce a flow rate in the communication path 39c as a difference between the first pump pressure and the second pump pressure is large.SELECTED DRAWING: Figure 2
【課題】作業機械の走行体のスリップが生じたときに好適な作動油の供給を行うことが可能な油圧駆動装置を提供する。【解決手段】油圧駆動装置は、作業腕にスリップ時の走行アシスト動作を行わせる特定作業アクチュエータ２７と、第１及び第２走行モータ２５Ｒ，２５Ｌと、第１及び第２油圧ポンプ３１，３２と、中立位置ＰＮと走行直進位置ＰＳに切換可能な走行切換弁３９と、走行直進位置での作業油路と走行油路とを連通する連通路に設けられる連通絞り部３９ｂと、単独操作時には走行切換弁３９を中立位置ＰＮに切換え、前進走行操作と特定作業操作とが同時に行われる特定複合操作時には走行切換弁３９を走行直進位置ＰＳに切換える切換制御部５０と、を備え、切換制御部５０は、第１ポンプ圧と第２ポンプ圧との差が大きいほど連通路３９ｃでの流量を減少させるように連通絞り部３９ｂの開度を調節する。【選択図】図２
To provide a hydraulic drive unit capable of supplying a suitable hydraulic fluid on the occurrence of slippage of a traveling body of a work machine.SOLUTION: A hydraulic drive unit includes: a specific work actuator 27 for making a work arm perform traveling assist movement in the slippage; first and second traveling motors 25R, 25L; first and second hydraulic pumps 31, 32; a travel switching valve 39 capable of switching between a neutral position PN and a straight traveling position PS; a communication throttle 39b provided at a communication path for bringing a work oil passage into communication with a traveling oil passage in the straight traveling position; and a switching control unit 50 for switching the travel switching valve 39 to the neutral position PN in the single operation, and switching the travel switching valve 39 to the straight traveling position PS in the specific compound operation when the advance traveling operation and the specific work operation are carried out simultaneously. The switching control unit 50 adjusts an opening of the communication throttle 39b so as to reduce a flow rate in the communication path 39c as a difference between the first pump pressure and the second pump pressure is large.SELECTED DRAWING: Figure 2
【課題】作業機械の走行体のスリップが生じたときに好適な作動油の供給を行うことが可能な油圧駆動装置を提供する。【解決手段】油圧駆動装置は、作業腕にスリップ時の走行アシスト動作を行わせる特定作業アクチュエータ２７と、第１及び第２走行モータ２５Ｒ，２５Ｌと、第１及び第２油圧ポンプ３１，３２と、中立位置ＰＮと走行直進位置ＰＳに切換可能な走行切換弁３９と、走行直進位置での作業油路と走行油路とを連通する連通路に設けられる連通絞り部３９ｂと、単独操作時には走行切換弁３９を中立位置ＰＮに切換え、前進走行操作と特定作業操作とが同時に行われる特定複合操作時には走行切換弁３９を走行直進位置ＰＳに切換える切換制御部５０と、を備え、切換制御部５０は、第１ポンプ圧と第２ポンプ圧との差が大きいほど連通路３９ｃでの流量を減少させるように連通絞り部３９ｂの開度を調節する。【選択図】図２
HYDRAULIC DRIVE UNIT OF TRAVELING WORK MACHINE
走行式作業機械の油圧駆動装置
UEDA KOJI (author)
2020-04-02
Patent
Electronic Resource
Japanese