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Matches 451 - 500 out of 3,193

Document Document Title
JP6525418B2  
JP6518379B2  
JP2019060453A
To provide an abnormality detection device which can detect abnormality of a fluid pressure actuator.An abnormality detection device 1 of a fluid pressure actuator A includes a displacement detection part 2 which detects a displacement o...  
JP6497739B2  
JP6497738B2  
JPWO2018179070A1
Irrespective of a state of abnormalities of a pump output switching arrangement, a hydraulic control system of an operating machine which can detect abnormalities of a pump output switching arrangement is provided. A hydraulic control sy...  
JP6495784B2  
JP6496631B2  
JP6496741B2  
JP2019049335A
To provide a construction machine capable of suppressing the unintended operation of a hydraulic actuator even when a double discharge type pump in a hydraulic closed circuit system is in trouble.A hydraulic closed circuit system 200 inc...  
JP6491084B2  
JP6484021B2  
JP2019506573A
The hydraulic device which comprises the 2nd valve manifold that provides the 1st valve manifold and overspeed degree control capability to provide stop capability uses effectively further the liquid pressure apparatus which comprises a ...  
JPWO2017187934A1
The 1st pressure sensor (50) with which a monitoring instrument (10) detects the 1st pressure value (P1) of pressure fluid in the 1st piping (26), It has the 2nd pressure sensor (52) that detects the 2nd pressure value (P2) of pressure f...  
JP6476702B2  
JP2019026402A
To provide a work machine capable of preventing hydraulic oil from leaking by ensuring the connected state of first and second members of a joint.The connected state of a plug 46 and a socket 47 is detected, and the detected incomplete c...  
JP2019026033A
To improve credibility of an automatic brake system.An automatic brake system 24 is so configured as to include: a second accumulator 25F, 25R; a front side second pipeline 28 and a rear side second pipeline 29; a second brake valve 30F,...  
JPWO2017164370A1
The fault read-out unit which can discover failure of the unloading circuit of an oil pressure system certainly is provided. The pump oil way where an unloading circuit connects a hydraulic pump and a direction control valve, The flow co...  
JP2019023409A
To perform a revolving operation of an upper structure so that moving of the upper structure to a valley side against the revolving operation according to release of a parking brake can be prevented, when the revolving operation of the u...  
JP6470129B2  
JP2019019967A
To provide a hydraulic driving device capable of operating a hydraulic actuator in response to operation of an operation device even in a case where a failure occurs in an electromagnetic proportional control valve or the wiring passage ...  
JPWO2017171022A1
With the usual lever operation, the fault detection device which can detect failure of an oil pressure pilot circuit automatically is provided. The pilot pressure supply part as for which a fault detection device supplies pilot pressure ...  
JP6466825B2  
JPWO2017164371A1
Also when the proportional solenoid valve itself breaks down, an operator provides an oil pressure system which can do work at the time of extraordinary operation safely. An oil pressure system is provided with a hydraulic pump, a contro...  
JP2019014591A
To immediately prevent fall of a suspended load if an abnormal state arises in a command signal that controls the capacity of a motor in a work machine including a winch drum driven by a secondary control system.A crane comprises: a main...  
JP2019010963A
To provide a steering control system capable of preventing a rudder plate driving part from performing undesired movement.An operation control system includes a rudder plate driving part, a liquid pressure pump, a direction-switching val...  
JP2019010964A
To provide a steering control system capable of preventing a rudder plate driving part from performing undesired movement when a failure occurs.A steering control system includes: a steering device including a rudder plate driving part f...  
JP6456102B2  
JP6455191B2  
JP6453711B2  
JP2018204784A
To provide means for quickly detecting the occurrence of the leakage of a working fluid in a working fluid supply/discharge mechanism of a hydraulic cylinder device in either case of the moving of a piston and a stop of the piston.A hydr...  
JP6438312B2  
JP6427221B2  
JP2018179199A
To provide a hydraulic system that can secure a certain discharge flow rate of a pump with a simple structure even when an electromagnetic proportional valve for outputting a secondary pressure to a regulator as a control pressure does n...  
JP2018179215A
To prevent malfunction of an actuator caused by pressure loss of an unloading device.A fluid pressure control device 100 includes: a supply passage 21 for supplying a working oil discharged from a pump 11 to actuators (15, 16); a dischar...  
JP2018179702A
To provide a cylinder equipment with leak detection system capable of detecting a leak of liquid regardless of the mounting direction of the cylinder equipment.A cylinder equipment with a leak detection system of the present invention in...  
JP2018179123A
To provide a hydraulic motor mechanism for a construction machine which copes with an abnormal rise of pressure in a drain conduit, and can avoid serious situations such as the damage of a shaft seat of a hydraulic motor, a stop of the h...  
JP2018168977A
To provide a hydraulic system including a first pump and a second pump in variable capacity type, capable of corresponding to failures or the like of an electromagnetic proportional valve at a low-cost configuration.A hydraulic system in...  
JP2018169015A
To provide a construction machine equipped with a hydraulic closed circuit system capable of continuing the utilization of the machine even when a changeover valve is opened and fixed due to the failure of the changeover valve or its con...  
JP2018168976A
To provide a hydraulic system capable of operating a hydraulic actuator at sufficient speed even if secondary pressure becomes zero due to a failure of an electromagnetic proportional valve for regulator.A hydraulic system includes: an o...  
JP6406298B2  
JP2018155374A
To solve a problem that, in a hydraulic-driven extrusion press, a temperature of an apparatus used for a hydraulic device such as a hydraulic pump is raised by the passage resistance of oil (leak amount) flowing from an annular clearance...  
JP2018155492A
To detect deterioration of a sealing function in a seal area in a fluid pressure device before fluid leaks to the outside.In a main seal 13 for sealing a rod side chamber 5 to which the fluid pressure is applied, a fluid leakage detector...  
JP2018151009A
To recover discharge pressure while ensuring a function of hydraulic equipment when discharge pressure of an oil pump decreases because of clogging and air entrainment of a strainer in an oil tank.When an absorption flow rate of an oil p...  
JP6396733B2  
JP2018146074A
To actuate a hydraulic actuator even in the case where a solenoid proportional valve for unloading valve fails and a secondary pressure of the solenoid proportional valve becomes zero.A hydraulic system includes: an operation device 4; a...  
JPWO2018055723A1
In the pressure oil energy regeneration device which carries out Boost regeneration of the return oil of an oil pressure cylinder, it prevents reaching overload relief setting pressure, and a change shock is controlled and good operativi...  
JP2018135704A
To automatically change the flow rate of hydraulic fluid supplied to a hydraulic actuator for attachment drive according to the type of attachment attached to a front work machine.When an operation valve 14 for an attachment is operated ...  
JPWO2017065249A1
First, pressure of oil in an oilway in a control valve device is measured. And based on an obtained measuring result, amplitude and a cycle of pressure fluctuation are detected and a Oil swing state or greaseless Vibration state is diagn...  
JP2018124183A
To correctly determine whether or not a flow control valve has caused an abnormal state due to hydraulic oil leakage.A fluid pressure drive device 1 includes: a flow control valve having a first movable part and controlling the discharge...  

Matches 451 - 500 out of 3,193