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JP4664606B2 |
A hydraulic control valve ( 1 ) is assigned to a pressure line ( 13 ) led from a pressure medium source to at least one load. The control valve has a first position in which the pressure line ( 13 ) is pressurized by the pressure medium ...
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JP4657014B2 |
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JP4643100B2 |
A safety valve for compressed air-operated consumers, including a valve housing having bores, and two direction control valves connected in parallel, each of the control valves having a working piston and a valve head connected to the pi...
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JP4630569B2 |
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JP4615270B2 |
A double valve for controlling a machine tool has a memory such that when the valve is in its normal deactuated state and the inlet air supply is cycled (e.g., turned from on to off or from off to on), then the valve remains in the deact...
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JP4614317B2 |
A double valve (10) is reset when a source of pressurized fluid is connected to a reset port. First and second reset pistons (38,64) are actuated in response to the pressurized fluid to reset first and second movable valve units (18,20) ...
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JP2011006919A |
To provide a working machine which can prevent the breakage of an accumulator before it occurs.The working machine is provided with an operation lever 134, a holding device rotation cylinder 18, and the accumulator 52. The operation leve...
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JP4609647B2 |
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JP4587657B2 |
Error-protected hydraulic circuit (30) for preventing simultaneous engagement of first and second friction-engaging elements comprises a device for generating oil pressure, a first safety valve (42), a first oil-pressure identification d...
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JP2010242530A |
To provide a hydraulic control apparatus capable of performing an exact diagnosis whether there is abnormality or not in a selector valve.A hydraulic control apparatus includes a relief valve 21 acting as a valve for letting a part of oi...
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JP2010238629A |
To provide an abnormality detecting device to detect abnormality of a hydraulic operation device easily and instantly mountable without opening a power supply of the hydraulic operation device and a cut-off device.The abnormality detecti...
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JP4559867B2 |
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JP2010209637A |
To convert a negative brake to a brake-on state promptly and securely even if there occurs such a situation that a brake selector valve is not switched from a brake-off position to a brake-on position due to a failure or the like of a co...
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JP3162937U |
To solve the problem of contact welding of an electromagnetic switch built in a power unit with a simple circuit configuration and improve safety. An oil tank 11, a pump P that sucks up and sends out hydraulic oil in an oil tank, an elec...
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JP4542819B2 |
In a hydraulic machine, hydraulic pump failure is detected and the pump lifespan is estimated before the pump failure occurs. The discharge pressure 122 , oil temperature 126 , and drain filter differential pressure 120 are measured, a c...
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JP4532691B2 |
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JP4515433B2 |
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JP4478636B2 |
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JP2010116934A |
To provide a method quantitatively and easily diagnosing abnormality of a gas-liquid separation type accumulator provided in a hydraulic system.This accumulator is photographed by an infrared thermography, and the abnormality of the accu...
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JP2010112075A |
To provide a device for controlling a speed of an actuator of a working machine, which suppresses a rise in temperature of pressure oil supplied to the hydraulic actuator during the performance of deceleration control, by a relatively si...
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JP4460008B2 |
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JP4453411B2 |
A hydraulic control system for a working machine according to the present invention includes a regulator control valve for controlling an operation of a pump regulator and a controller for sending a control signal for changing a discharg...
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JP4448634B2 |
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JP2010078039A |
To surely make a hydraulic fluid flow according to a connected hydraulic actuator.This hydraulic system includes a controller 75 for controlling a quantity increase in a hydraulic fluid in a high flow valve 51 according to an operation m...
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JP4430025B2 |
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JP2010048359A |
To provide a pump control circuit of a construction machine for automatically switching to a smoothly operable state, by solving the problem of causing lug down of an engine 30, when a controller causes failure and when wiring is disconn...
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JP4395700B2 |
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JP4390074B2 |
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JP2009263061A |
To stop reckless running even if sticking occurs in a solenoid proportional pressure-reduction valve.Throttle check valves 27a, 27b are provided on pilot lines 21a, 21b for connecting the solenoid proportional pressure-reduction valves 1...
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JP2009264455A |
To provide an accumulator gas pressure drop detecting method and device for accurately detecting the abnormal drop of gas pressure in an accumulator during driving a hydraulic pump.The gas pressure drop detecting device for the accumulat...
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JP3153759U |
To urgently operate a working machine portion of a vehicle even if it is used in a so-called generator-integrated floodlight and a situation occurs in which the working machine cannot be operated due to, for example, boom, outrigger oper...
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JP4331754B2 |
The bearing (1) for the axial support of a gas turbine rotor (8) has a bearing component (2) in which is installed a hydraulic piston arrangement (3,4) with which communicates a hydraulic system(9). Restrictors (26,27) and flow control v...
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JP4327390B2 |
The accumulators (5,105,205) are connected on each circuit in a number sufficient for feeding each pair of brakes, with each pair of brakes mounted on a particular landing gear unit, and with an electric pump (30,31) being used to mainta...
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JP4312430B2 |
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JP4279746B2 |
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JP4281714B2 |
A hydraulic circuit for a working machine includes hydraulic actuators (9,10) which respectively drive a plurality of kinds of working devices and which are driven by a drive circuit having circuit states that correspond to the working d...
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JP4271685B2 |
In a working vehicle, in response to the operation of an operating lever by an operator after idling stop of the engine, control is effected to automatically restart the engine in such a manner that the working vehicle will not unexpecte...
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JP2009097702A |
To detect the gas pressure of an accumulator when gas pressure in a gas chamber is lowered lower than predetermined pressure, and to issue an alarm.A hydraulic unit comprises: a hydraulic circuit 3 driving an actuator 1; a manometer 7 me...
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JP2009097605A |
To apply a road sensing system to a mini-shovel.This electric hydraulic work machine has a fixed capacity type hydraulic pump 11 driven by an electric motor 10, first and second hydraulic actuators 12 driven by pressure oil from the hydr...
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JP4261024B2 |
A relation between an instruction current value (is) to be given to a solenoid valve and its supply time range (t) is predetermined, and a silting prevention current instruction (is) is given to the solenoid valve according to the this r...
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JP2009074618A |
To provide a safety valve enabling normal operation by releasing a lock, even if actuating in a case other than emergency.The safety valve comprises a communicating passage 25 communicating a cylinder chamber 6, on which load pressure wh...
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JP4246631B2 |
An energy cylinder for operating a valve of a turbine, in particular of a steam turbine, is disclosed, wherein a cylinder housing and a control block are combined into a common block. The latter has two diametrically arranged lateral sur...
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JP4243857B2 |
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JP4245065B2 |
A pressure sensor (17) is provided for detecting the discharge pressure of a hydraulic pump (11). An abnormality detection section (23) of a controller (21) detects a dry operation of the hydraulic pump (11) when the discharge pressure d...
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JP4232784B2 |
A hydraulic control device for a working machine includes control valves (1-6); hydraulic actuators controlled by corresponding control valves and divided into groups (A,B); unified bleed-off valves (27,28) disposed on discharge lines of...
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JP2009036252A |
To provide a clogging detecting device capable of automatically detecting clogging in a fin part of a cooling core without visual checking, and a work vehicle equipped with the same.A clogging detecting portion 20 is a device determining...
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JP4226594B2 |
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JP4214086B2 |
The present invention relates to a safety securing system (1) for an operation lever (50) through which work equipment (101) does not operate unexpectedly or suddenly. The safety securing system (1) includes a receiver (10) for receiving...
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JP4213037B2 |
The invention relates to a method for controlling a pressure supply device in a hydraulic circuit, especially in a hydraulic circuit in an automatic gearbox which comprises an hydraulic pump, a pressure control valve and a consumer. The ...
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JP2008291962A |
To detect the sticking fault of a proportional valve by a cheap system.This unit comprises: a proportional valve drive indicator 12 to output the proportional valve indicating current for driving the proportional valve 6; a pressure meas...
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