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公开(公告)号：EP1164297A4
公开(公告)日：2003-04-16
申请号：EP01946922
申请日：2001-01-24
Applicant: HITACHI CONSTRUCTION MACHINERY , NAT AEROSPACE LAB
Inventor： NAKATANI KENICHIRO , KANAI TAKASHI , TSURUGA YASUTAKA , KAWAMOTO JUNYA , HAMAMOTO SATOSHI , OKAZAKI YASUHARU , NAGAO YUKIAKI
CPC classification number: F15B11/167 , E02F9/22 , E02F9/2225 , E02F9/2232 , E02F9/226 , E02F9/2282 , E02F9/2285 , E02F9/2296 , F15B11/05 , F15B11/165 , F15B2211/20553 , F15B2211/20584 , F15B2211/253 , F15B2211/30505 , F15B2211/30535 , F15B2211/30555 , F15B2211/3105 , F15B2211/3144 , F15B2211/31576 , F15B2211/324 , F15B2211/329 , F15B2211/355 , F15B2211/40507 , F15B2211/6054 , F15B2211/6055 , F15B2211/6346 , F15B2211/6355
Abstract: A hydraulic driving device, comprising a pressure compensating valve in an LS system, wherein an actuator lock switching valve (50), allowing a drain line (52) and a pilot line (53) to communicate with each other when the valve is switched to position (C) and allowing pilot lines (51) and (53) to communicate with each other when the valve is switched to position (D), is provided therein, the pilot line (51) is connected to a delivery line (7) of a hydraulic pump (10), the pilot line (53) is connected to pressure receiving parts (28a, 28b) provided at the closing operation side end part of pressure compensating valves (21a, 21b), and the actuator lock switching valve (50) having a pressure receiving part (55) connected to the output side of a pilot lock switching valve (43) is switched in conjunction with the switching of the switching valve (43), whereby, even when the drive device contains a directional control valve of mechanical switching system or a directional control valve of mechanical switching system is added, the actuator can be locked with a simple structure so as to prevent an erroneous operation from occurring when the drive device is not operated during engine driving.
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公开(公告)号：EP0877168A4
公开(公告)日：2000-09-20
申请号：EP97912461
申请日：1997-11-14
Applicant: HITACHI CONSTRUCTION MACHINERY
Inventor： TSURUGA YASUTAKA , KANAI TAKASHI , KAWAMOTO JUNYA
CPC classification number: F15B11/05 , E02F9/2232 , E02F9/2285 , E02F9/2296 , F04B49/08 , F04B49/24 , F04B2203/0605 , F15B2211/20523 , F15B2211/20553 , F15B2211/253 , F15B2211/30535 , F15B2211/50536 , F15B2211/635 , F15B2211/71
Abstract: A differential pressure PLS between a discharge pressure of a hydraulic pump (2) and a maximum load pressure on a plurality of actuators (3a-3c) is maintained at a target differential pressure ΔPLSref by a pump capacity control device (5). The target differential pressure ΔPLSref is modified in accordance with the revolution speed of an engine (1) by conducting to an operation drive unit (32) a differential pressure ΔPp across a restriction (50) provided in a discharge passage of a fixed pump (30). An unloading valve (80) comprises first and second auxiliary control pressure chambers (80e, 80f), to which the differential pressure ΔPp across the restriction (50) is conducted, and a target differential pressure ΔPun for the unloading valve (80) is also modified according to the modification of the target differential pressure ΔPLSref caused by the operation drive unit (32). Accordingly, a stable load sensing control can be performed without being affected by the engine revolution speed.
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公开(公告)号：EP0587902A4
公开(公告)日：1994-10-19
申请号：EP93904317
申请日：1993-02-18
Applicant: HITACHI CONSTRUCTION MACHINERY
Inventor： TANAKA HIROHISA , OSHINA MORIO , KANAI TAKASHI , TANAKA ATSUSHI CITYHEIGHTS-KIM
CPC classification number: F15B21/087 , E02F9/2221 , E02F9/2296
Abstract: A hydraulically driving system which comprises: a plurality of flowrate detectors (10A, 10B) for respectively detecting flowrates supplied to a plurality of hydraulic actuators (3A, 3B); valve control devices (11A, 11B) for controlling a plurality of flowrate regulating valves (40A, 40B) such that the flowrates detected by the plurality of flowrate detectors coincide with flowrates instructed by a plurality of control levers (5A, 5B); and pump included rotation control devices (12; 12A-12F) for controlling a discharge flowrate from a hydraulic pump such that the discharge flowrate from the hydraulic pump (1) is less than the total sum of the flowrates instructed by the plurality of control levers by a predetermined flowrate (ΔQref; Xref). The pump inclined rotation control device controls the discharge flowrate of the hydraulic pump (1) by use of flowrate deviations (ΔQ1, ΔQ2) obtained by respectively subtracting the flowrates detected by the flowrate detectors (10A, 10B) from the flowrates instructed by the control levers (5A, 5B).
Abstract translation: 一种液压驱动系统，包括：多个流量检测器（10A，10B），用于分别检测供给多个液压致动器（3A，3B）的流量; 阀控制装置（11A，11B），用于控制多个流量调节阀（40A，40B），使得由多个流量检测器检测的流量与由多个控制杆（5A，5B）指示的流量一致; 并且泵包括用于控制来自液压泵的排出流量的旋转控制装置（12; 12A-12F），使得来自液压泵（1）的排出流量小于由多个控制杆指示的流量的总和 通过预定的流量（ΔQref; Xref）。 泵倾斜旋转控制装置利用从由控制指示的流量分别减去由流量检测器（10A，10B）检测到的流量而得到的流量偏差（ΔQ1，ΔQ2），来控制液压泵（1）的排出流量 杠杆（5A，5B）。
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公开(公告)号：EP1162374A4
公开(公告)日：2002-10-30
申请号：EP01900635
申请日：2001-01-10
Applicant: HITACHI CONSTRUCTION MACHINERY
Inventor： TSURUGA YASUTAKA , KANAI TAKASHI , KAWAMOTO JUNYA , HAMAMOTO SATOSHI , OKAZAKI YASUHARU , NAGAO YUKIAKI
CPC classification number: E02F9/226 , E02F9/2203 , E02F9/2232 , E02F9/2285 , E02F9/2296 , F15B11/163 , F15B2211/20553 , F15B2211/253 , F15B2211/30505 , F15B2211/30535 , F15B2211/3111 , F15B2211/351 , F15B2211/6054 , F15B2211/651 , F15B2211/71 , F15B2211/75
Abstract: A hydraulic drive device having target compensation pressure differences for pressure compensating valves (21a, 21b) set by a pressure difference between a pump delivery pressure and the maximum load pressure and a target LS pressure difference set as a variable value dependent upon the number of rotations of an engine (1), wherein a fixed throttle (32) and a signal pressure variable relief valve (33) are disposed in a maximum load pressure line (35), and a relief set pressure PLMAX' is set to be PLMAX'=PR - PGR + α (α is a value smaller than PGR) where the target LS pressure difference is RGR and the set pressure of a main relief valve (30) is PR, whereby, in the combined operation where a plurality of actuators are driven simultaneously, even if a load pressure of any one of the actuators reaches the set pressure of the main relief valve, the pressure compensating valves will not close, the other actuators do not increase their speeds, and thus an excellent combined controllability can be obtained.
Abstract translation: 本发明提供一种液压驱动装置，该液压驱动装置具有由泵输出压力与最大负载压力的压力差所设定的压力补偿阀（21a，21b）的目标补偿压力差和目标LS压力差，该目标LS压力差被设定为取决于旋转次数的可变值 其特征在于，在最大负荷压力管路（35）内配置有固定节流阀（32）和信号压力可变溢流阀（33），释放设定压力PLMAX'设定为PLMAX'= 在目标LS压力差为RGR且主溢流阀（30）的设定压力为PR的情况下，PR-PGR +α（α为小于PGR的值），因此在多个致动器被驱动的组合动作 同时，即使任何一个执行机构的负载压力达到主安全阀的设定压力，压力补偿阀也不会关闭，其他执行机构不会增加它们的速度，因此具有出色的组合可控性 可以获得。
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公开(公告)号：EP1054162A4
公开(公告)日：2002-06-12
申请号：EP99958478
申请日：1999-12-02
Applicant: HITACHI CONSTRUCTION MACHINERY
Inventor： TSURUGA YASUTAKA , KANAI TAKASHI , KAWAMOTO JUNYA , NAKATANI KENICHIRO , TAKAHASHI KIWAMU , HAMAMOTO SATOSHI , OKAZAKI YASUHARU , NAGAO YUKIAKI
CPC classification number: E02F9/128 , E02F3/325 , E02F3/964 , E02F9/123 , E02F9/2207 , E02F9/2267 , E02F9/2271 , E02F9/2296 , F15B11/0406 , F15B11/162 , F15B2211/20553 , F15B2211/251 , F15B2211/30505 , F15B2211/30535 , F15B2211/3111 , F15B2211/50518 , F15B2211/5153 , F15B2211/6054 , F15B2211/7053 , F15B2211/7058 , F15B2211/71 , F15B2211/75
Abstract: A hydraulic driving unit comprising a pump controller (18) controlling the discharge flow rate such that the pump discharge pressure is higher than the maximum load pressures in actuators (2 - 6) by a predetermined amount, and pressure compensation valves (12 - 16) having respective differential pressures between the discharge pressure of a hydraulic pump (1) and the maximum load pressures of the actuators (2 - 6) set to target compensation differential pressures, the pressure compensation valve (12) having a load-dependent characteristic that reduces the target compensation differential pressure when the load pressure increases, the pressure compensation valve (12) of the swing section being provided with a lower-limit setting spring (55) for preventing the target compensation differential pressure from lowering below a predetermined value. Thereby, the system is provided that permits acceleration without jerks at both the start for swing alone and the start for swing combination suppresses changes in the swing speed during transition from swing alone to combination, permits, at the start for swing combination, acceleration without extremely reducing the swing speed as compared with other actuators, and presents no problem, such as increases in cost and space or complicated circuit arrangement.
Abstract translation: 一种液压驱动单元，其包括控制排出流量以使得泵排出压力比致动器（2-6）中的最大负载压力高预定量的泵控制器（18）以及压力补偿阀（12-16） 具有在液压泵（1）的排出压力与设定为目标补偿差压的致动器（2-6）的最大负载压力之间的相应差压，所述压力补偿阀（12）具有降低负载的特性， 当负载压力增加时的目标补偿压差，摆动部分的压力补偿阀（12）设置有用于防止目标补偿压差降低到预定值以下的下限设定弹簧（55）。 由此，提供了这样一种系统，其允许在单独开始摆动和摆动组合的开始时不加急速地加速，并且在从摆动单独转换到组合的过程中抑制摆动速度的变化，允许在摆动组合的开始时不加速地加速 与其他致动器相比减小摆动速度，并且不存在成本和空间增加或电路布置复杂等问题。
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Patent Agency Ranking
公开(公告)号：EP0879968A4
公开(公告)日：2000-09-20
申请号：EP97912460
申请日：1997-11-14
Applicant: HITACHI CONSTRUCTION MACHINERY
Inventor： TSURUGA YASUTAKA , KANAI TAKASHI , KAWAMOTO JUNYA
CPC classification number: F15B11/165 , E02F9/2225 , E02F9/2232 , E02F9/2292 , E02F9/2296 , F04B49/08 , F04B2203/0605 , F04B2205/08 , F15B2211/20538 , F15B2211/20553 , F15B2211/253 , F15B2211/30535 , F15B2211/3111 , F15B2211/31576 , F15B2211/351 , F15B2211/575 , F15B2211/6054 , F15B2211/6355 , F15B2211/7053 , F15B2211/71
Abstract: Differential pressures across flow control valves (6a, 6b, 6c) are controlled by pressure compensating valves (7a, 7b, 7c) to a differential pressure ΔPLS having the same value, and the differential pressure ΔPLS is maintained at a target differential pressure ΔPLSref by a pump capacity control device (5). To modify the target differential pressure ΔPLSref depending upon a change in revolution speed of an engine (1), a flow rate detecting valve (31) is provided on discharge passages (30a, 30b) in a fixed capacity hydraulic pump (30) so that a differential pressure ΔPp across a variable restriction (31a) in the flow rate detecting valve (31) is conducted to a setting modifying device (32) to modify the target differential pressure ΔPLSref. The flow rate detecting valve (31) acts to change an opening area of the variable restriction (31a) depending upon the differential pressure ΔPp across the variable restriction (31a) itself, and to change the differential pressure ΔPp in accordance with the revolution speed of the engine (1). Accordingly, saturation phenomenon is improved in accordance with the engine revolution speed, and a favorable minute operability is obtained in the case where the engine revolution speed is set low.
Abstract translation: 流量控制阀（6a，6b，6c）之间的压差由压力补偿阀（7a，7b，7c）控制为具有相同值的压差ΔPLS，并且压差ΔPLS被保持在目标压差ΔPLSref× 泵容量控制装置（5）。 为了根据发动机（1）的转速变化来修正目标压差ΔPLSref，在固定容量型液压泵（30）的排出通路（30a，30b）上设置流量检测阀（31） 通过流量检测阀（31）的可变限制部（31a）的压差ΔPp向设定变更装置（32）传递，变更目标差压ΔPLSref。 流量检测阀31根据可变限制部31a自身的差压ΔPp来改变可变限制部31a的开口面积，根据该可变限制部31a的旋转速度来变更差压ΔPp 发动机（1）。 因此，根据发动机转速提高饱和现象，并且在发动机转速设定得低的情况下获得良好的分钟可操作性。
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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.
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公开(公告)号：JP2000087388A
公开(公告)日：2000-03-28
申请号：JP27434498
申请日：1998-09-10
Applicant: HITACHI CONSTRUCTION MACHINERY , HOKUETSU KOGYO CO
Inventor： YAMAMOTO AKIHIKO , OTA MAKOTO , KANAI TAKASHI , ABE YUKINARI
Abstract: PROBLEM TO BE SOLVED: To prevent a malfunction of a blade cylinder when pressure oil is to be supplied to a span cylinder. SOLUTION: Main pipelines 31, 32 bifurcate to branch pipelines 31A, 3B and 32A, 32B, respectively, and a span cylinder 17 and a blade cylinder 20 are parallel-connected to the front ends of the pipelines 31A, 32A and front ends of the pipelines 31B, 32B, respectively. Either the span cylinder rod-side branch pipeline 31A or the blade cylinder bottom-side branch pipeline 31B is selectively connected to the upstream side main pipeline 31 by a selection valve 27. On the other hand the span cylinder bottom-side branch pipeline 32A and the blade cylinder rod-side branch pipeline 32B are always connected to the upstream main pipeline 32 via a junction 33. The blade cylinder rod-side branch pipeline 32B has a pilot-type check valve 34 arranged thereacross, which opens only when pressure oil is supplied to the blade cylinder 20.
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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.
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公开(公告)号：JPH08324977A
公开(公告)日：1996-12-10
申请号：JP13401895
申请日：1995-05-31
Applicant: HITACHI CONSTRUCTION MACHINERY
Inventor： FUNATO KOJI , KANAI TAKASHI
Abstract: PURPOSE: To prevent dropping down a suspension load according to damaging an hydraulic equipment, by providing a switching means of connecting/interrupting a connection pipe line part, in the connection pipe line part positioned between a connecting point of an input side pipe line to a connection pipe line and a switching valve provided in the connection pipe line. CONSTITUTION: In a solenoid valve 26, due to misoperating and damaging a hydraulic equipment comprising a check valve 25 or the like, when pressure oil flows out from an input side pipe line 5, an outflow amount of the pressure oil is limited by a throttle 23, to prevent suddenly rotating an oil hydraulic motor 2 and suddenly dropping down an excavator 7. On the other hand, rapidly decreasing a pressure in the input side pipe line 5 is detected by a pressure detector 22, further to detect a lowering speed and penetrating force of the excavator 7 by a rope speed detector 8 and by a penetrating force detector 12. When a detection value is higher tan a maximum value, a controller 9 outputs an operational signal of interrupting supplying a command pressure to a brake device 6 relating to a solenoid valve 19, further to output a signal of interrupting the input side pipe line 5 and a connection pipe line 15 relating to a solenoid valve 24. In this way, rotating an oil hydraulic motor 2 is stopped, also to brake a drum 4.
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