JPS5923104A - Hydraulic pressure control device with combined regeneration and preferential operation - Google Patents

Hydraulic pressure control device with combined regeneration and preferential operation

Info

Publication number
JPS5923104A
JPS5923104A JP57133253A JP13325382A JPS5923104A JP S5923104 A JPS5923104 A JP S5923104A JP 57133253 A JP57133253 A JP 57133253A JP 13325382 A JP13325382 A JP 13325382A JP S5923104 A JPS5923104 A JP S5923104A
Authority
JP
Japan
Prior art keywords
spool
pressure
port
flow path
chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP57133253A
Other languages
Japanese (ja)
Other versions
JPH0235162B2 (en
Inventor
Masahiko Ozeki
大関　雅彦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KYB Corp
Original Assignee
Kayaba Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kayaba Industry Co Ltd filed Critical Kayaba Industry Co Ltd
Priority to JP57133253A priority Critical patent/JPH0235162B2/en
Publication of JPS5923104A publication Critical patent/JPS5923104A/en
Publication of JPH0235162B2 publication Critical patent/JPH0235162B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/021—Valves for interconnecting the fluid chambers of an actuator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/024—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/162—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for giving priority to particular servomotors or users
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
    • F15B13/0403—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves a secondary valve member sliding within the main spool, e.g. for regeneration flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20538—Type of pump constant capacity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3122—Special positions other than the pump port being connected to working ports or the working ports being connected to the return line
    • F15B2211/3127—Floating position connecting the working ports and the return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3122—Special positions other than the pump port being connected to working ports or the working ports being connected to the return line
    • F15B2211/3133—Regenerative position connecting the working ports or connecting the working ports to the pump, e.g. for high-speed approach stroke
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
    • F15B2211/31576—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having a single pressure source and a single output member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/321—Directional control characterised by the type of actuation mechanically
    • F15B2211/324—Directional control characterised by the type of actuation mechanically manually, e.g. by using a lever or pedal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7058—Rotary output members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7135—Combinations of output members of different types, e.g. single-acting cylinders with rotary motors

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE:To allow a swivel motor to be preferentially operated and simultaneously to attain regeneration of an arm cylinder, by providing a fluid passage in association with a direction selector valve for a spool in a hydraulic control device for a power shovel. CONSTITUTION:When a direction selector valve 34 and a spool 3 are in their neutral position, oil in a pump 9 is returned to a tank 10. When the spool 3 is switched to its left position, pressure in a pressure chamber 23 and a bottom side chamber 6 becomes a pump pressure with the aid of a communication port 35. Return oil in a rod side chamber 7 is returned to a tank 10, and a regenerative spool 19 is moved by the difference between decrease in the pump pressure due to load of an arm cylinder 1 in the direction as depicted by 29 and increase in pressure in a pilot chamber 32, thereby entering oil into a high pressure flow line 12. On the other hand, when the spool 3 is switched to its right position, the pump 9 is brought into communication with the rod side chamber 7, thereby maintaining the hydraulic pressure at a high level. When the direction selector valve 34 is switched, a swivel motor 33 is rotated, and the same operation as the above by the reciprocal movement of the spool is effected with the exception that the pressure chamber 23 receives no pressurized oil from the pump. Thus, in the case that the swivel motor 33 and the arm cylinder 1 are simultaneously operated, the former is preferentially actuated relative to the latter.

Description

【発明の詳細な説明】 この発明は、たとえばパワーショベルのＡｉｔ回モータ
を１憂先的に作動させるとともに、アームシリンダの再
生もできる装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device capable of preemptively operating the Ait motor of a power shovel, for example, and also regenerating the arm cylinder.

（従来の制御装置） 第１図はパワーショベルのアームシリンダ１の再生用の
制御装置で、弁本体２にスプール３を内装するとともに
、この弁本体にはアクチェータポート４．５を形成して
いる。(Conventional control device) Fig. 1 shows a control device for regenerating an arm cylinder 1 of a power shovel, in which a spool 3 is installed inside a valve body 2, and an actuator port 4.5 is formed in this valve body. .

］−記一方のアクチェータポート４は、アームシリンダ
ｌのボトム側室６に接続し、他方のアクチェータポーＩ
・５は、ロッド側室７に接続している。] - One actuator port 4 is connected to the bottom side chamber 6 of the arm cylinder l, and the other actuator port I is connected to the bottom side chamber 6 of the arm cylinder l.
-5 is connected to the rod side chamber 7.

そして」二足スプール３が図示の中立位置にあるとき、
その中立流路８が開放されポンプ９からの油はタンクｌ
Ｏにそのまま戻る。and "when the bipedal spool 3 is in the neutral position shown,
The neutral flow path 8 is opened and the oil from the pump 9 is transferred to the tank l.
Return directly to O.

さらに」二足スプール３を左右いずれかに切換えると、
上記中立流路８が閉ざされるとともに、いずれか一方の
アクチェータポートかポンプ９に連通する。Furthermore, if you switch the bipedal spool 3 to either the left or right side,
The neutral flow path 8 is closed and communicated with one of the actuator ports or the pump 9.

たとえばスプール３を図面左方向に切換えたとするど、
スプール３に形成の第１環状溝１１を介して高圧流路１
２とアクチェータポート４とが連通し、スプール３を右
方向に切換えると、第２環状溝１３を介して上記高圧流
路１２とアクチェータポート５とが連通ずる関係にして
いる。For example, if you switch spool 3 to the left in the drawing,
The high pressure flow path 1 is passed through the first annular groove 11 formed in the spool 3.
2 communicates with the actuator port 4, and when the spool 3 is switched to the right, the high pressure flow path 12 and the actuator port 5 communicate with each other via the second annular groove 13.

そして上記高圧がＬ路１２はロードチェック弁１４を介
してパラレルフィーダ１５に連通ずるので、この高圧流
路と連通したアクチェータポートからポンプ９の圧油が
アームシリンダ１に供給されることになる。Since the high pressure L path 12 communicates with the parallel feeder 15 via the load check valve 14, the pressure oil of the pump 9 is supplied to the arm cylinder 1 from the actuator port communicating with this high pressure flow path.

」二足のようにしたスプール３の一端には、第３環状溝
１６を形成しているが、この第３環状溝１６は、当該ス
プール３が右方向に切換えられとき、一方のアクチェー
タポート４を低圧流路１７に連通させるためのものであ
る。A third annular groove 16 is formed at one end of the bipedal spool 3, and when the spool 3 is switched to the right, one actuator port 4 is formed in the third annular groove 16. This is for communicating with the low pressure flow path 17.

また」二足スプールの他端すなわち一］二足第３環状溝
とは反対側には、スプール孔１８を形成するとともに、
このスプール孔１８に再生用スプール１８を内装してい
る。In addition, a spool hole 18 is formed at the other end of the bipedal spool, that is, the side opposite to the bipedal and third annular grooves,
A regeneration spool 18 is installed in this spool hole 18.

上記再生用スプール１８は、その両端に大径部２０．２
１を形成し、当該大径部間を流通路２２としている。The regeneration spool 18 has large diameter portions 20.2 at both ends thereof.
1, and a flow path 22 is formed between the large diameter portions.

そして内側の大径部２０との間で形成される圧力室２３
にはスプリング２４を介在させ、このスプリング２４の
作用で当該再生用スプール１８を、通常は上記スプール
孔１日外端に設けたストッパー２５に接しさせる関係に
している。A pressure chamber 23 is formed between the inner large diameter portion 20 and the inner large diameter portion 20.
A spring 24 is interposed therebetween, and the action of this spring 24 brings the regeneration spool 18 into contact with a stopper 25 normally provided at the outer end of the spool hole.

上記のように再生用スプール１８がストッパー２５に接
している状態において、内側の大径部２０がスプールに
形成の第１ボーｉ・２６を閉じる一方、第２．３ボート
２７．２８を上記流通路２２に開放する関係にしている
。In the state where the regeneration spool 18 is in contact with the stopper 25 as described above, the inner large diameter portion 20 closes the first bow I 26 formed on the spool, while the second and third boats 27 and 28 are The relationship is such that it is open to Road 22.

そして当該スプール３を左方向に切換えたとき、上記第
１ボートが前記高圧流路１２と連通ずる−・方、第２ボ
ートがアクチェータポート５に連通し、第３ポートが前
記低圧流路１７に連通ずる関係にしている。When the spool 3 is switched to the left, the first boat communicates with the high pressure channel 12, the second boat communicates with the actuator port 5, and the third port communicates with the low pressure channel 17. We have a continuous relationship.

しかして」−記スプール３を図面左方向に切換えると、
前記したように第１環状溝を介して高圧流路１２どアク
チェータポート４とが連通ずるので、ポンプからの油は
アームシリンダ１のボトム側室６に流入し、当該アーム
シリンダ１を矢印２９方向に伸長させる。However, when the spool 3 is switched to the left in the drawing,
As described above, the high pressure flow path 12 communicates with the actuator port 4 via the first annular groove, so oil from the pump flows into the bottom side chamber 6 of the arm cylinder 1 and moves the arm cylinder 1 in the direction of the arrow 29. Stretch it.

そして上記のようにスプールが左方向に切換えられたと
き、第２環状溝１３は高圧流路１２と多少オーバラップ
するとともに、第１ポート２６が高圧流路１２と連通ず
る関係にしている。換言すれば、パームシリンダ１のボ
トム側室６にポンプからの油を供給しているときにも、
その圧油は第２環状溝１３から小孔３０を通って圧力室
２３に常置流入する関係にしている。When the spool is switched to the left as described above, the second annular groove 13 overlaps the high pressure passage 12 to some extent, and the first port 26 communicates with the high pressure passage 12. In other words, even when oil is being supplied from the pump to the bottom side chamber 6 of the palm cylinder 1,
The pressure oil is arranged to permanently flow into the pressure chamber 23 from the second annular groove 13 through the small hole 30.

このときのロッド側室７からの戻り油は、アクチェータ
ポート５から第２ボート２７を経由して流通路２２に流
入し、この流通路から第３ポート２８を通って低圧流路
１７に流出する。At this time, the return oil from the rod side chamber 7 flows from the actuator port 5 via the second boat 27 into the flow passage 22, and from this flow passage passes through the third port 28 and flows out into the low pressure flow passage 17.

ただしアートシリンダ１が矢印２９方向に伸長するとき
は、多少カウンター負荷ぎみになり、そのために圧力室
２３内の圧力が低くなる。一方ロッド側室７からの戻り
油が第３ポート２８を通過するときに多少の圧損が発生
し、そのときの圧力が、再生スプール１９に形成の絞り
通路３１を通ってパイロット室３２に流入する。そのた
めに上記パイロット室３２内の圧力が圧力室２３内の圧
力より高くなり、再生スプール１９をスプリング２４に
抗して移動させる。However, when the art cylinder 1 extends in the direction of the arrow 29, there is a slight counter load, which lowers the pressure inside the pressure chamber 23. On the other hand, when the return oil from the rod side chamber 7 passes through the third port 28, some pressure loss occurs, and the pressure at that time flows into the pilot chamber 32 through the throttle passage 31 formed in the regeneration spool 19. Therefore, the pressure in the pilot chamber 32 becomes higher than the pressure in the pressure chamber 23, causing the regeneration spool 19 to move against the spring 24.

」二足のように再生スプールが移動すると、外側の大径
部２１によって第３ポート２日を閉じるかあるいはそれ
を絞るとともに、内側の大径部２０が第１ポート２６を
開くことになる。As the regeneration spool moves like a bipedal, the outer large diameter section 21 closes or throttles the third port 26, while the inner large diameter section 20 opens the first port 26.

したがって口・ンド側室７からの戻り油は、第２ポート
２７→流通路２２→第１ポート２６を通って、高圧流路
１２４こ流入することになる。すなわちロッド側室７の
戻り油がボトム側室６に供給されることになる。Therefore, the return oil from the port/end side chamber 7 passes through the second port 27 → the flow path 22 → the first port 26, and flows into the high pressure flow path 124. That is, the return oil from the rod side chamber 7 is supplied to the bottom side chamber 6.

上記のようにした従来の装置では、当該アームシリンダ
に負荷が作用しているかぎり、旋回モータを優先的に作
動させることができない。In the conventional device as described above, as long as a load is applied to the arm cylinder, the swing motor cannot be activated preferentially.

なぜなら当該アームシリンダに負荷が作用していると、
再生用スプール１９が第１図の状態にあるので、負荷が
小さい方が優先的に作動してしまうからである。This is because when a load is applied to the arm cylinder,
This is because, since the regeneration spool 19 is in the state shown in FIG. 1, the one with the smaller load operates preferentially.

もし上記した装置を用いて旋回モータを優先的に作動さ
せようとすると、そのために別の装置面を設けなければ
ならず、それだけ当該機器が大型化してしまう欠点があ
った。If the above-mentioned device were to be used to preferentially operate the swing motor, a separate device would have to be provided for this purpose, which would increase the size of the device.

（本発明の目的） この発明は、一つの制御装置で再生及び優先制御ができ
る装置の提供を目的にする。(Object of the present invention) An object of the present invention is to provide a device that can perform regeneration and priority control using one control device.

（本発明の実施例） 第２図に示した第１実施例は、旋回モータ３３を制御す
るための方向切換弁３４の上流側にこの発明の装置を接
続している。(Embodiment of the present invention) In the first embodiment shown in FIG. 2, the device of the present invention is connected to the upstream side of a directional control valve 34 for controlling a swing motor 33.

上記装置は、前記従来の装置と共通の要素を含んでいる
ので、その共通要素については同一符号を伺して説明す
る。Since the above device includes common elements with the conventional device, the common elements will be described using the same reference numerals.

そしてこの装置は、第２環状１４１３に、前記従来の装
置のような前記小孔３０を形成していない。In this device, the small hole 30 is not formed in the second ring 1413 as in the conventional device.

ただし当該圧力室２３には、スプール３に形成の連通ポ
ート３５の一端を接続している。However, one end of a communication port 35 formed on the spool 3 is connected to the pressure chamber 23.

この連通ボート３５の他端は、スプール３外周番こ形成
の環状切欠部３６に開口させているが、この環状切欠部
３６は、当該スプール３の中央に形成した第４環状溝３
７に通じる関係にしている。The other end of this communication boat 35 is opened in an annular notch 36 formed on the outer periphery of the spool 3.
The relationship is similar to that of 7.

そしてスプール３が図示の中立位置にあるとき、上記第
４環状溝３７を介して中立流路８とセンター通路３Ｂと
が連通ずる一方、スプール３を右方向に切換えたときは
、上記センター通路３８と中立流路８との連通が遮断さ
れる関係にしている。When the spool 3 is in the neutral position shown in the figure, the neutral flow path 8 and the center passage 3B communicate with each other via the fourth annular groove 37, while when the spool 3 is switched to the right, the center passage 38 The communication between the neutral flow path 8 and the neutral flow path 8 is cut off.

なお上記環状切欠部３６は第４環状溝３７と常時連通す
る関係にあり、したがって前記圧力室２３はこの環状切
欠部の絞り効果を受ながら常時第４環状１Ｍ３７と連通
する構成している。Note that the annular notch 36 is in constant communication with the fourth annular groove 37, and therefore the pressure chamber 23 is configured to always communicate with the fourth annular groove 1M37 while receiving the throttling effect of this annular notch.

さらに」二足連通ボート３５は、スプール３を左方向に
切換えたとき、」−記センター通路３８に対して完全に
開口する関係にしている。Furthermore, the two-legged communication boat 35 is in a relationship in which it is completely opened to the center passage 38 when the spool 3 is switched to the left.

しかして旋回モータ３３の方向切換弁３４を図示の中立
位置に保持しているときには、ポンプ９からの油が」二
足方向切換弁の中立流路３８を経由してセンター通路３
８に流入する。Thus, when the directional control valve 34 of the swing motor 33 is held in the neutral position shown, oil from the pump 9 passes through the neutral passage 38 of the two-leg directional control valve to the center passage 3.
8.

このとき当該スプール３が図示の中立位置にあると、上
記センター通路３８に流入した油はそのままタンクＩＯ
に戻る。At this time, when the spool 3 is in the neutral position shown in the figure, the oil flowing into the center passage 38 is directly transferred to the tank IO.
Return to

」−記の状態からスプール３を左方向に切換えると、セ
ンター通路３８とタンクｌＯとの連通が遮断されるとと
もに、その゛スプールに形成の連通ボート３５がセンタ
ー通路３８に連通ずるので、前記圧力室２３がポンプ圧
に維持される。- When the spool 3 is switched to the left from the state described above, the communication between the center passage 38 and the tank lO is cut off, and the communication boat 35 formed on the spool is brought into communication with the center passage 38, so that the pressure is reduced. Chamber 23 is maintained at pump pressure.

またスプール３が」二足のように左方向に切換えられる
と、第１環状溝１１を介して高圧流路１２とアクチェー
タボーＩ・４とが連通ずるので、ポンプ９からの油は、
パラレルフィーダ１５→高圧流路１２→アクチエータポ
ート４を通ってボトム側室６（こ流入する。Furthermore, when the spool 3 is switched to the left like two legs, the high pressure flow path 12 and the actuator bow I.4 are communicated via the first annular groove 11, so that the oil from the pump 9 is
It flows into the bottom side chamber 6 (through the parallel feeder 15 → high pressure channel 12 → actuator port 4).

そしてこのときのロッド側室７の戻り油は、アクチェー
タボート→第２ボート２７→流通路２２→第３ポート２
８を経由して低圧流路１７からタンク４０（こ戻る。At this time, the return oil in the rod side chamber 7 is from the actuator boat to the second boat 27 to the flow path 22 to the third port 2.
8 from the low pressure flow path 17 to the tank 40 (return).

」−記のようにロッド側室７の戻り油が第３ポート２日
を通過するときに差圧が発生し、その圧力がパイロット
室３２に流入する。When the return oil from the rod side chamber 7 passes through the third port 2, a pressure difference is generated, and this pressure flows into the pilot chamber 32 as shown in the figure.

このとき当該アームシリンダ１にたとえば矢印２９方向
のカウンター負荷が作用すると、ポンプ圧か低くなるの
で、前記圧力室２３内の圧力に対してパイロット室３２
の圧力の方が高くなる。At this time, if a counter load acts on the arm cylinder 1 in the direction of arrow 29, for example, the pump pressure decreases, so that the pressure in the pilot chamber 3
The pressure will be higher.

そこで再生用スプール１９がスプリング２４に抗して移
動し、第３ポート２８を閉じるかあるいはそれを絞ると
ともに、第１ポート２６を開「」させる。The regeneration spool 19 then moves against the spring 24 to close or throttle the third port 28 and open the first port 26.

この状！川でロッド側室７の戻り油は、アクチェータポ
ート５→第２ポート２７→第１ボート２８を経由して高
圧流路１２に合流する。This situation! Return oil from the rod side chamber 7 in the river flows through the actuator port 5 → second port 27 → first boat 28 and joins the high pressure flow path 12 .

なお当該スプール３を右側位置に切換だときは、第２環
状溝１３を介して高圧流路１２とアクチェータポート５
とが連通ずるとともに、第１環状溝１１を介してアクチ
ェータポート４とが連通ずるもので、この関係は前記従
来と同様である。Note that when the spool 3 is switched to the right position, the high pressure flow path 12 and the actuator port 5 are connected via the second annular groove 13.
The actuator port 4 communicates with the actuator port 4 via the first annular groove 11, and this relationship is the same as that of the prior art.

また前記方向切換弁３４を左右いずれかに切換えるとと
もに、当該スプール３を左右いずれかに切換えて、旋回
モータとアームシリンタとを同時に操作させると、酸１
ｉｌモータが優先的に作動するが、その理由は次のとお
りである。Furthermore, when the direction switching valve 34 is switched to either the left or right, and the spool 3 is switched to the left or right to operate the swing motor and the arm cylinder at the same time, the acid 1
The il motor operates preferentially for the following reasons.

Ｊ二足のように方向切換弁３４を切換えると、旋回モー
タ３３が回転するどともに、センター通路３８とポンプ
９との連通が遮断される。したがって前記圧力室２３に
はポンプからの圧油が導入されないことになる。When the directional control valve 34 is switched as in J-bisho, the swing motor 33 rotates and the communication between the center passage 38 and the pump 9 is cut off. Therefore, no pressure oil from the pump is introduced into the pressure chamber 23.

これと同時に前記と同様にしてボトム側室６に圧油が流
入するとともに、ロッド側室７がらの戻り油は第３ボー
ト２８を通って低圧流路１７がら流出する。At the same time, pressure oil flows into the bottom side chamber 6 in the same manner as described above, and return oil from the rod side chamber 7 passes through the third boat 28 and flows out from the low pressure channel 17.

ロンド側室７の戻り油が第３ポート２８を通過すれば、
そこに差圧が発生してパイロンｉ・室３２に圧力が導入
されるとともに、上記したように圧力室２３に圧力が導
入ネれていないので、当該再生用スプール１９がスプリ
ング２４に抗して移動し、その移動位置を保持したまま
となる。If the return oil from the Rondo side chamber 7 passes through the third port 28,
A differential pressure is generated there, and pressure is introduced into the pylon i chamber 32, and since pressure is not introduced into the pressure chamber 23 as described above, the regeneration spool 19 resists the spring 24. It moves and maintains its moving position.

再生用スプールが上記移動位置を保持していれば、ロッ
ド側室の戻り油は、第２ポート２７と第１ポート２６を
通って高圧流路１２に合流する。If the regeneration spool maintains the above movement position, the return oil in the rod side chamber flows into the high pressure flow path 12 through the second port 27 and the first port 26.

上記のようにロンド側室７の戻り油が第２ポートと第１
ポートとを通過するとき、それらポートの絞り効果によ
って、当該回路圧が高圧に維持される。As mentioned above, the return oil of the Rondo side chamber 7 is connected to the second port and the first port.
When passing through the ports, the circuit pressure is maintained at a high pressure due to the throttling effect of those ports.

このように回路圧が高圧に維持されるので、旋回モータ
３３とアームシリンタ１とを同時操作したときにも、当
該旋回モータの回転が阻止されようなこのかない。Since the circuit pressure is maintained at a high pressure in this manner, even when the swing motor 33 and the arm cylinder 1 are operated simultaneously, the rotation of the swing motor is not blocked.

なおスプール３を右方向に切換えた場合は、前記したと
同様にして当該アームシリンダｌが収縮する。そしてこ
のときは、アームをＪＪｆさせているときなので、当該
アームシリンダに常に負荷が作用する。Note that when the spool 3 is switched to the right, the arm cylinder 1 contracts in the same manner as described above. At this time, the arm is being moved to JJf, so a load is always applied to the arm cylinder.

つまりこの場合は、特別の手当をしなくても当該回路圧
を高く維持できるので、その圧力によって旋回モータが
常に回転することになる。In other words, in this case, the circuit pressure can be maintained high without any special measures, and the swing motor will always rotate due to this pressure.

次に第３図に示した第２実施例について説明する。Next, a second embodiment shown in FIG. 3 will be described.

この第２実施例はその再生用スプール１９の内側大径部
２０内方にスプリング室４１を形成し、このスプリング
室４１にスプリング４２を内装する一方、このスプリン
グ室４２よりさらに内力に圧力室４３を形成している。In this second embodiment, a spring chamber 41 is formed inside the large diameter part 20 of the regeneration spool 19, and a spring 42 is installed inside the spring chamber 41. is formed.

なお符号４３はスプリング室４２に接続したｌ”　ｌ／
ン通路４３である。Note that the reference numeral 43 is l” l/ connected to the spring chamber 42.
This is the main passageway 43.

この第２実施例で」−記のように構成したのは、圧力室
４２に臨ませた再生用スプール１９の受圧面４」−を、
パイロット室３２の受圧面積よりも小さくするためであ
る。In this second embodiment, the pressure receiving surface 4 of the regeneration spool 19 facing the pressure chamber 42 is configured as shown below.
This is to make it smaller than the pressure receiving area of the pilot chamber 32.

このように圧力室４２の受圧面積が小さいので、第１実
施例よりも圧力室４２に高圧か・４人されないかぎり、
再生用スプール１９かスプリング２４に抗して移動しな
いことになる。In this way, the pressure receiving area of the pressure chamber 42 is small, so unless there are four people in the pressure chamber 42, the pressure will be higher than in the first embodiment.
The regeneration spool 19 will not move against the spring 24.

したがってアームシリンタ１をｒｌｊ、独で操作すると
き、ボトム側室６か、第１実施例より高月二になるまで
再生機能が働くことになる。Therefore, when the arm cylinder 1 is operated by rlj, the regeneration function will work until the bottom side chamber 6 or, from the first embodiment, reaches Takatsuki 2.

そのために当該パワーショヘルで軽掘削や水中地ならし
などの負荷圧が低い作業をするときにも、ロッド側室７
の戻り油を高圧流路１２に合流させることができ、その
作業のスピードアップを図れる利点がある。For this reason, even when performing work with low load pressure such as light excavation or underwater leveling with the power shovel, the rod side chamber 7
The return oil can be made to join the high-pressure flow path 12, which has the advantage of speeding up the work.

なおこのｊｐ２実施例において、前記圧力室４２に臨ま
せた部分を、再生用スプールと分離したピストンにして
もよいこと当然である。In this jp2 embodiment, it goes without saying that the portion facing the pressure chamber 42 may be a piston separate from the regeneration spool.

（本発明の構成及び効果） この発明の構成は、タンクに連通ずる低圧流路と、パラ
レルフィーダを介してポンプに連通ずる高圧流路と、シ
リンダのボトム側室に連通ずるアクチェータポ−１・と
、同じくロッド側室に連通ずるアクチェータポートとを
弁本体に形成するとどもに、この弁本体にスプールを内
装し、このスプールに形成の第１環状溝あるいは第２環
状溝を介して、」二足高圧流路をいずれか一方のアクチ
ェータポートに連通させ、上記低圧流路をいずれか他方
のアクチェータポートに連通させる一方、当該スプール
が中立位置に維持されているとき、センター通路をタン
クに連通させる中立流路を弁本体に形成した油圧制御装
置において、前記スプールの片側に形成したスプール孔
と、このスプール孔に摺動自在に内装する一方、所要の
間隔を保持して一対の大径部を設けるとともに、前記ス
プール孔内における大径部間を流通路としてなる内゛牛
用スプールと、前記スプール孔内であってスプールより
も内方に形成した圧力室と、スプールよりも開方に形成
され、しかも絞り通路を介して前記流通路と常時連通ず
るパイロット室と、上記圧力室に設け、再生用スプール
の初期位置を、没定するスプリングと、上記第２環状溝
よりやや外側にあって、かつ再生用スプールの」−記初
期位置にで内側の大径部によって閉ざされる第１ポーＩ
・と、この第１ボートの外方にあり、かつ前記流通路に
対して常時開いた状態を維持する第２ポーＩ・と、この
第２ボートより外方にあり、再生用スプールの上記初期
位置で、流通路に対して聞いた状ｊハ；を維持するｐｆ
Ｓ３ボートと、前記圧力室に一端を聞Ｌ１させ、他端を
第４環状溝よりやや外力のスプール摺動面に開口させた
連通ボートとを備えてなり、スプールを所定方向に切換
えたとき、−、Ｌ記連通ボートがセンター通路に連通ず
る関係にし、かつ第１ポートが高圧流路と対応し、第２
ポートがロンド側室に連通ずるアクチェータポートに対
応し、第３ポートが低圧流路に対応する関係にしている
。(Configuration and effects of the present invention) The configuration of the present invention includes a low pressure passage communicating with the tank, a high pressure passage communicating with the pump via a parallel feeder, and an actuator port 1 communicating with the bottom side chamber of the cylinder. Similarly, an actuator port that communicates with the rod side chamber is formed in the valve body, and a spool is installed inside the valve body. neutral flow that communicates the flow path with either actuator port and the low-pressure flow path with either actuator port, while communicating the center passage with the tank when the spool is maintained in the neutral position; In a hydraulic control device in which a passage is formed in a valve body, a spool hole is formed on one side of the spool, and a pair of large diameter portions are provided inside the spool hole so as to be slidable therein, while maintaining a required interval. , an inner cow spool having a flow path between the large diameter portions in the spool hole, a pressure chamber formed in the spool hole inward from the spool, and a pressure chamber formed in an open direction from the spool; Moreover, a pilot chamber is provided in the pressure chamber, which constantly communicates with the flow passage through a throttle passage, and a spring is provided to fix the initial position of the regeneration spool, and the spring is located slightly outside the second annular groove, and The first port I, which is closed by the inner large diameter part at the initial position of the regeneration spool.
- and a second port I, which is located outside the first boat and always maintains an open state with respect to the flow path, and a second port I, which is located outside this second boat, and which is located at the initial stage of the regeneration spool. At the position, maintain the condition heard with respect to the flow path pf
S3 boat, and a communication boat having one end connected to the pressure chamber L1 and the other end opened to the spool sliding surface of a slightly external force from the fourth annular groove, and when the spool is switched in a predetermined direction, -, the communication boat indicated by L communicates with the center passage, and the first port corresponds to the high pressure flow path, and the second port corresponds to the high pressure flow path;
The port corresponds to the actuator port communicating with the Rondo side chamber, and the third port corresponds to the low pressure flow path.

したがってこの発明においては、当該装置の下流側に他
のアクチェータの方向切換弁を接続した場合に、当該装
置に接続したアクチェータの負荷圧が低いときにも、−
に足側のアクチェータを必ず作動させられる。Therefore, in this invention, when the directional control valve of another actuator is connected to the downstream side of the device, even when the load pressure of the actuator connected to the device is low, -
The actuator on the foot side is always activated.

またこの装置に接続した当該アクチェータにたとえばカ
ウンター負荷が作用したときには、そのアクチェータの
戻り油を再生できる。Furthermore, when a counter load acts on the actuator connected to this device, the return oil of the actuator can be regenerated.

しかもこの装置では、上記両機能が発揮されるので、再
生と侵先との制御機器を別々に備える必要が全くない。Furthermore, since this device performs both of the above functions, there is no need to provide separate control devices for regeneration and invasion.

【図面の簡単な説明】[Brief explanation of the drawing]

図面第１図は従来の要部断面図、第２図はこの発明の第
１実施例を示す要部断面図、第３図は第２実施例の要部
断面図である。 ２Φ・・弁本体、３・拳−スプール、４．５・・・アク
チェータポート、６・拳−ホトム側室、７・・・ロッド
側室、８・・・中立流路、９・・φポンプ、１０．４０
・・・タンク、１１・・ｅ第１環状溝、１２・・・高圧
流路、１３・・・第２環状１＋Ｉ’ｔ、１５・・・パラ
レルフィーダ、１７・Φ・低圧流路、１９◆◆・再生ス
プール、２０．２１・・・大径部、２２・・拳流通路、
２３．４２・・・圧力室、２６〜２８・φ・第１〜３ボ
ート、３１・・・絞り通路、３２・・・パイロット室、
３５−◆・連通ポート、３８・・・センター通路、３９
・・・中立流路。 代理人弁理±　１１＋へ　宜之FIG. 1 is a sectional view of a conventional main part, FIG. 2 is a sectional view of a main part showing a first embodiment of the present invention, and FIG. 3 is a sectional view of a main part of a second embodiment. 2Φ... Valve body, 3. Fist-spool, 4.5... Actuator port, 6. Fist-photo side chamber, 7... Rod side chamber, 8... Neutral flow path, 9... φ pump, 10 .40
...Tank, 11...e first annular groove, 12...High pressure flow path, 13...Second annular 1+I't, 15...Parallel feeder, 17.Φ.Low pressure flow path, 19◆ ◆・Regeneration spool, 20.21・Large diameter part, 22・・Fist flow passage,
23.42...Pressure chamber, 26-28, φ, 1st to 3rd boats, 31... Throttle passage, 32... Pilot chamber,
35-◆・Communication port, 38...Center passage, 39
...neutral flow path. Attorney attorney ± 11+ Yoshiyuki

Claims (1)

【特許請求の範囲】[Claims] タンクに連通ずる低圧流路と、パラレルフィーダを介し
てポンプに連通ずる高圧流路と、シリンダのボトム側室
に連通ずるアクチェータポー１・と、同じくロッド側室
に連通ずるアクチェータポートとを弁本体に形成すると
ともに、この弁本体にスプールを内装し、このスプール
に形成の第１環状溝あるいは第２環状溝を介して、上記
高圧流路をいずれか一方のアクチェータポートに連通さ
せ、−ｈ記低圧流路をいずれか他方のアクチェータポー
トに連通させる一方、当該スプールが中立位置に維持さ
れているとき、センター通路をタンクに連通させる中立
流路を弁本体に形成した油圧制御装置において、前記ス
プールの片側に形成したスプール孔と、このスプール孔
に摺動自在に内装する一方、所要の間隔を保持して一対
の大径部を設けるとともに、前記スプール孔内における
大径部間を流通路としてなる再生用スプールと、前記ス
プール孔内であってスプールよりも内方に形成した圧力
室と、スプールよりも外方に形成され、しかも絞り通路
を介して前記流通路と常時連通するパイロット室と、上
記圧力室に設け、再生用スプールの初期位置を設定する
スプリングと、−１−足温２環状溝よりやや外側にあっ
て、かつ再生用スプールの上記初期位置にで内側の大径
部によって閉ざされる第１ポートと、この第１ポートの
外方にあり、かつ前記流通路に対して常時開いた状ｙ〃
；を＃ｉｔ持する第２ボートと、この第２ポートより外
方にあり、再生用スプールの」−記初期位置で、流通路
に対して聞いた状態を維持する第３ポートと、前記圧力
室に一端を開Ｉコさせ、他端を第４環状溝よりやや外方
のスプール摺動面に開口させた連通ポートとを備えてな
り、スプールを所定方向に切換えたとき、上記連通ポー
トがセンター通路に連通ずる関係にし、かつ第１ポート
が高圧流路と対応し、第２ボートがロッド側室に連通ず
るアクチェータポーｉ・に対応し、第３ボートが低圧流
路に対応する関係にした再生及び侵先兼用油圧制御装置
。A low-pressure flow path that communicates with the tank, a high-pressure flow path that communicates with the pump via the parallel feeder, an actuator port 1 that communicates with the bottom side chamber of the cylinder, and an actuator port that also communicates with the rod side chamber are formed in the valve body. At the same time, a spool is installed inside the valve body, and the high pressure flow path is communicated with either one of the actuator ports through the first annular groove or the second annular groove formed in the spool, and the low pressure flow indicated by -h is made to communicate with one of the actuator ports. In a hydraulic control device in which a neutral flow path is formed in a valve body that communicates a center passage with a tank when the spool is maintained in a neutral position, one side of the spool A spool hole is formed in the spool hole, and a pair of large-diameter portions are provided inside the spool hole so as to be slidable therein, while maintaining a required spacing, and the portion between the large-diameter portions in the spool hole is used as a flow path. a pressure chamber formed inside the spool hole and inward from the spool; a pilot chamber formed outside the spool and constantly communicating with the flow path via a throttle passage; A spring is provided in the pressure chamber and sets the initial position of the regeneration spool, and a spring is located slightly outside of the annular groove and is closed by the inner large diameter portion at the above initial position of the regeneration spool. a first port, and a state located outside the first port and always open to the flow path.
; a third port located outwardly from the second port and maintaining the regeneration spool in its initial position relative to the flow path; and a third port having the pressure The chamber is provided with a communication port having one end opened and the other end opened on the spool sliding surface slightly outward from the fourth annular groove, and when the spool is switched in a predetermined direction, the communication port is opened. The first port corresponds to the high pressure flow path, the second port corresponds to the actuator port connected to the rod side chamber, and the third port corresponds to the low pressure flow path. Hydraulic control device for both regeneration and invasion.
JP57133253A 1982-07-30 1982-07-30 SAISEIOYOBYUSENKENYOYUATSUSEIGYOSOCHI Expired - Lifetime JPH0235162B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57133253A JPH0235162B2 (en) 1982-07-30 1982-07-30 SAISEIOYOBYUSENKENYOYUATSUSEIGYOSOCHI

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57133253A JPH0235162B2 (en) 1982-07-30 1982-07-30 SAISEIOYOBYUSENKENYOYUATSUSEIGYOSOCHI

Publications (2)

Publication Number Publication Date
JPS5923104A true JPS5923104A (en) 1984-02-06
JPH0235162B2 JPH0235162B2 (en) 1990-08-08

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62220705A (en) * 1986-03-18 1987-09-28 Yutani Juko Kk Variable regeneration circuit valve for hydraulic cylinder
JPS62278301A (en) * 1986-05-27 1987-12-03 Yutani Heavy Ind Ltd Variably regenerating circuit
JPS62278302A (en) * 1986-05-27 1987-12-03 Yutani Heavy Ind Ltd Variably regenerating circuit
JPH0242711A (en) * 1988-04-18 1990-02-13 Canon Inc Structure of lithography mask
JPH03117704A (en) * 1990-09-10 1991-05-20 Yutani Heavy Ind Ltd Recycling and combining method for hydraulic cylinder
KR100631067B1 (en) * 2004-05-04 2006-10-02 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 Hydraulic control valve having holding valve with improved response characteristics

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62220705A (en) * 1986-03-18 1987-09-28 Yutani Juko Kk Variable regeneration circuit valve for hydraulic cylinder
JPH0457881B2 (en) * 1986-03-18 1992-09-16 Yutani Juko Kk
JPS62278301A (en) * 1986-05-27 1987-12-03 Yutani Heavy Ind Ltd Variably regenerating circuit
JPS62278302A (en) * 1986-05-27 1987-12-03 Yutani Heavy Ind Ltd Variably regenerating circuit
JPH0550601B2 (en) * 1986-05-27 1993-07-29 Yutani Juko Kk
JPH0242711A (en) * 1988-04-18 1990-02-13 Canon Inc Structure of lithography mask
JPH03117704A (en) * 1990-09-10 1991-05-20 Yutani Heavy Ind Ltd Recycling and combining method for hydraulic cylinder
JPH0459484B2 (en) * 1990-09-10 1992-09-22 Yutani Juko Kk
KR100631067B1 (en) * 2004-05-04 2006-10-02 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 Hydraulic control valve having holding valve with improved response characteristics

Also Published As

Publication number Publication date
JPH0235162B2 (en) 1990-08-08

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