-
公开(公告)号：JP2003113804A
公开(公告)日：2003-04-18
申请号：JP2001304844
申请日：2001-10-01
Applicant: HITACHI CONSTRUCTION MACHINERY , NACHI FUJIKOSHI CORP
Inventor： TSURIGA YASUTAKA , KAWAMOTO JUNYA , TAKAHASHI KIWAMU
IPC: E02F9/22 , F15B11/00 , F15B11/02 , F15B11/028
Abstract: PROBLEM TO BE SOLVED: To prevent speed variation of a particular actuator from changing its speed by supplying pressure oil preferentially to it even if the saturation state of the amount of pump discharge occurs, to maintain the priority for the actuator irrespective of settings of the engine speed and to realize good operability, in a hydraulic driving device having an LS system. SOLUTION: A differential pressure reducing valve 11 is provided to output differential pressure between discharge pressure of a hydraulic pump 2 and the maximum load pressure of actuators 3a, 3b, etc., as an absolute pressure. Also a differential pressure reducing valve 51 is provided to output pressure according to the engine speed as an absolute pressure. Target compensation differential pressure is set by introducing the output pressure of the valve 11 to non-slewing pressure compensation valves 7b and 7c, whereas target compensation differential pressure is set by introducing the output pressure of the valve 51 to a slewing pressure compensation valve 7a. A limiter 91 is provided in a pump inclination rolling variable mechanism 90 of a pump inclination rolling control mechanism 12. The limiter 91 sets the minimum discharge amount of a hydraulic pump 2 to the largest requested flow rate for slewing or more.
-
公开(公告)号：JP2003113802A
公开(公告)日：2003-04-18
申请号：JP2001304834
申请日：2001-10-01
Applicant: HITACHI CONSTRUCTION MACHINERY , NACHI FUJIKOSHI CORP
Inventor： ITO KENJI , KANAI TAKASHI , TSURIGA YASUTAKA , KAWAMOTO JUNYA , HAMAMOTO SATOSHI , OKAZAKI KOJI , OGURA YUJI
IPC: E02F9/22 , F15B11/00 , F15B11/02 , F15B11/028
Abstract: PROBLEM TO BE SOLVED: To prevent speed variation of a particular actuator by supplying pressure oil preferentially to it even if a saturation state of the amount of pump discharge occurs, to maintain the priority for the actuator irrespective of settings of the engine speed and to realize good operability, in a hydraulic driving device having an LS system. SOLUTION: A differential pressure reducing valve 11 is provided for outputting differential pressure between discharge pressure of a hydraulic pump 2 and the maximum load pressure of actuators 3a, 3b, etc., as an absolute pressure. Also a differential pressure reducing valve 51 is provided for outputting pressure according to the engine speed as an absolute pressure. Target compensation differential pressure is set by introducing the output pressure of the valve 11 to non-slewing pressure compensation valves 7b, etc., whereas target compensation differential pressure is set by introducing the output pressure of the valve 51 to a slewing pressure compensation valve 7a. A slewing priority spring 70d is provided on the valve 7a in order to shift the target compensation differential pressure in the increasing direction.
-
公开(公告)号：JPH10196604A
公开(公告)日：1998-07-31
申请号：JP33240697
申请日：1997-11-17
Applicant: HITACHI CONSTRUCTION MACHINERY
Inventor： TSURIGA YASUTAKA , KANAI TAKASHI , KAWAMOTO JUNYA
Abstract: PROBLEM TO BE SOLVED: To provide an excellent fine controllability when an engine speed is set at low level by improving a saturation phenomenon according to the engine speed in a load sensing control type hydraulic drive device. SOLUTION: Pressure differences across flow control valves 6a, 6b, and 6c are controlled to the same pressure differential ΔPLS by pressure compensating valves 7a, 7b, and 7c, respectively, and the pressure differential ΔPLS is maintained at a target pressure differential ΔPLSref by a pump capacity control device 5. Also, a flow detection valve 31 is installed to the delivery routes 30a and 30b for a fixed displacement hydraulic pump 30 so as to change the target pressure differential ΔPLSref according to a variation in the speed of an engine 1, and a pressure differential ΔPp across the variable throttling 31a of the flow detection valve 31 is led into a set change device 32 so as to change the target pressure differential ΔPLSref. Thus the flow detection valve 31 varies the opening area of the variable throttling 31a according to the pressure differential ΔPp across the variable throttling 31a itself, and also varies the pressure differential ΔPp according to the speed of the engine 1.
-
公开(公告)号：JPH0930229A
公开(公告)日：1997-02-04
申请号：JP18443695
申请日：1995-07-20
Applicant: HITACHI CONSTRUCTION MACHINERY
Inventor： TSURIGA YASUTAKA
IPC: B60G17/005 , B60G17/015
Abstract: PROBLEM TO BE SOLVED: To provide a suspension device for a working vehicle that can suppress the vibration and impact of a body generated by the action of large load and earth cutting. SOLUTION: In the case of no-load or light load, the opening of a proportional solenoid valve 23 is in a fully opened state, and the vibration of a body 2 is absorbed and damped by the outflow-inflow of oil between a hydraulic cylinder 6 and a pressure accumulator 11, and a throttle 12. When load is increased, the stroke of the hydraulic cylinder 6 is shortened, and a control part 24 throttles the proportional solenoid valve 23 on the basis of the detection value of a stroke sensor 22. When the stroke becomes less than the specified value s1 , the proportional solenoid valve 23 is put in a cut-off state to lock the hydraulic cylinder 6. Work with large load acting thereon can thereby be performed without hindrance, and since the proportional solenoid valve 23 is throttled to lower the speed before the hydraulic cylinder 6 is locked, impact and vibration are suppressed.
-
公开(公告)号：JPH08268022A
公开(公告)日：1996-10-15
申请号：JP7174695
申请日：1995-03-29
Applicant: HITACHI CONSTRUCTION MACHINERY
Inventor： TSURIGA YASUTAKA
Abstract: PURPOSE: To absorb and damp vibration generated during running without having any effect upon workability. CONSTITUTION: The vibration resulting from the roughness of a road surface, which is generated while a working vehicle 1A is running, is transmitted to an axle 3, and expands and contracts the piston of a hydraulic cylinder 6 mounted between a vehicle body 2 and the axle 3 vertically. This expansion and contraction is carried out by deforming a triangular link mechanism consisting of a part of a hydraulic cylinder 6, a link 7 and the vehicle body 2. Pressure oil moves at a space to an accumulator 11 through a throttle 12 according to the expansion and contraction. The compressive elasticity of gas accumulated by the accumulator 11 works as a spring function, and the throttle 12 exhibits a function of vibration damping. The working reaction generated during working is received by the collision of the stopper elements 15a, 15b of a stopper 15 before the hydraulic cylinder 6 reaches the stroke end on its contraction side.
-
Patent Agency Ranking
公开(公告)号：JPH06340212A
公开(公告)日：1994-12-13
申请号：JP12931293
申请日：1993-05-31
Applicant: HITACHI CONSTRUCTION MACHINERY
Inventor： TSURIGA YASUTAKA , OSHINA MORIO
IPC: B60G11/26 , B60G17/015 , B60G17/04 , B60G21/05 , B60G21/10
Abstract: PURPOSE:To absorb and damp vibration during travel by providing piping for connecting hydraulic cylinders connected between an axle and a body, and controlling the opening area of a valve, provided between the piping and a pressure accumulator connected to the piping, according to the grade and frequency of pressure fluctuation in the piping. CONSTITUTION:Hydraulic cylinders 11a, 11b between a body 2 and the lateral sides of an axle 3 are communicated with a pressure accumulator 13 by piping 12, and a solenoid proportional valve 14 is provided between the piping and the pressure accumulator 13 and controlled by a controller 15 in such a way as to have opening area corresponding to the pressure in the piping and the fluctuation cycle of this pressure. When the pressure in the piping 12 is intensified, the opening area of the solenoid proportional valve 14 becomes large so as to make pressure oil flow easily into the pressure accumulator 13 from the piping 12, but in the case of the pressure in the piping 12 being reduced, the supply of pressure oil is suppressed. As a result, the repetition of inflow/ outflow of pressure oil to/from the accumulator 13, that is, the pressure vibration of the accumulator 13, is damped. In conclusion, the solenoid proportional valve 14 functions as a damper.
-
公开(公告)号：JP2019026033A
公开(公告)日：2019-02-21
申请号：JP2017146503
申请日：2017-07-28
Applicant: HITACHI CONSTRUCTION MACHINERY
Inventor： TANAKA TAKATERU , IKARI TAKANOBU , TSURIGA YASUTAKA , SATO TAKAYUKI , SASAKI TAKASHI
Abstract: 【課題】自動ブレーキシステムの信頼性を高める。【解決手段】自動ブレーキシステム24は、第2アキュムレータ25F,25Rと、フロント側第2管路28およびリヤ側第2管路29と、第2ブレーキ弁30F,30Rと、第1の電磁切換弁32と、第1シャトル弁33F,33Rと、コントローラ37とを含んで構成され、フロント側第2管路28には、第2の電磁切換弁34Fと圧力センサ35Fが設けられ、リヤ側第2管路29には、第2の電磁切換弁34Rと圧力センサ35Rが設けられる。コントローラ37は、圧力センサ35F,35Rで検出した作動流体の圧力と、第1の電磁切換弁32または第2ブレーキ弁30F,30Rに供給した動作信号とに基づいて第2ブレーキ弁30F,30Rが正常な動作をしていないと判断した場合に、第2の電磁切換弁34F,34Rを切換制御する。【選択図】図2
-
公开(公告)号：JP2003113803A
公开(公告)日：2003-04-18
申请号：JP2001304842
申请日：2001-10-01
Applicant: HITACHI CONSTRUCTION MACHINERY
Inventor： TSURIGA YASUTAKA , KANAI TAKASHI , KAWAMOTO JUNYA
IPC: E02F9/22 , F15B11/00 , F15B11/02 , F15B11/028
Abstract: PROBLEM TO BE SOLVED: To prevent speed variation of a particular actuator by supplying pressure oil preferentially to it even if the saturation state of the amount of pump discharge occurs, to maintain the priority for the actuator irrespective of settings of the engine speed and to realize good operability, in a hydraulic driving device having an LS system. SOLUTION: A differential pressure reducing valve 11 is provided to output differential pressure between discharge pressure of a hydraulic pump 2 and the maximum load pressure of actuators 3a, 3b and 3c as an absolute pressure. Also a differential pressure reducing valve 51 is provided to output pressure according to the engine speed as an absolute pressure. Target compensation differential pressure is set by introducing the output pressure of the valve 11 to non-slewing pressure compensation valves 7b and 7c, whereas target compensation differential pressure is set by introducing intermediate pressure that is obtained by parting the output pressure of the valves 11 and 51 by restrictions 80 and 81 to a slewing pressure compensation valve 7a.
-
公开(公告)号：JPH0988902A
公开(公告)日：1997-03-31
申请号：JP24603695
申请日：1995-09-25
Applicant: HITACHI CONSTRUCTION MACHINERY
Inventor： TSURIGA YASUTAKA
Abstract: PROBLEM TO BE SOLVED: To acculately control an inclination angle of a pump in spite of pressure change of pump line by controlling the inclination angle of a variable displacement hydraulic pump to be a target angle based on an instruction signal value of the inclination angle, a real measured value of the inclination angle and the discharge pressure. SOLUTION: Signal 9 is corrected in a feedforward manner by converting the pressure variation of a pump line 5 to the variable quantity of spool position for making zero of pressure flow to an oil chamber 4 by a correction computing part 17. When the inclination angle of the pump 1 reaches a target inclination angle θref and difference Δθ becomes zero a solenoid valve 7 returns to a spool state where rising portion of pressure Ps of the pump line 5 is corrected and the feed/exhaust of pressure oil to the oil chamber 4 is not executed. As a result, the inclination angle of the pump 1 is stable without being influenced by the pressure of the pump line 5 and response is quick owing to the feedforward correction of the influence of pressure variation.
-
公开(公告)号：JPH0858345A
公开(公告)日：1996-03-05
申请号：JP19966694
申请日：1994-08-24
Applicant: HITACHI CONSTRUCTION MACHINERY
Inventor： TSURIGA YASUTAKA
Abstract: PURPOSE: To provide the suspension device for a working vehicle capable of reducing vibration of a car body at the time of high running while holding a grounding property improved of four wheels at work time. CONSTITUTION: Hydraulic cylinders 11, 12 are mounted on right/left both sides of a car body 2. Pistons 11a, 12a of these hydraulic cylinders are connected rotatably through connecting pins 13 to both end parts of at least any one axle of the two axles 3 mounted in a front/rear of the car body 2. Pressure oil chambers 11b, 12b of each hydraulic cylinder are connected to communicate by a communication pipe line 14. An accumulator 18 is connected to the communication pipe line through a parallel pipe line 15 comprising the first pipe line 15a having a throttle 16 and the second pipe line 15b having a check valve 17. The check valve 17 is set to a direction of regulating a flow of pressure oil from the accumulator 18 to the hydraulic cylinder.
-
-
-
-
-
-
-
-
-
Search Results
42
records
(took 0.027 seconds)
