WO1994010453A1 - Load sensing valve - Google Patents

Load sensing valve Download PDF

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Publication number
WO1994010453A1
WO1994010453A1 PCT/JP1993/001533 JP9301533W WO9410453A1 WO 1994010453 A1 WO1994010453 A1 WO 1994010453A1 JP 9301533 W JP9301533 W JP 9301533W WO 9410453 A1 WO9410453 A1 WO 9410453A1
Authority
WO
WIPO (PCT)
Prior art keywords
sleeve
spool
port
pressure receiving
hole
Prior art date
Application number
PCT/JP1993/001533
Other languages
French (fr)
Japanese (ja)
Inventor
Kenji Morino
Katsuji Ishikawa
Original Assignee
Kabushiki Kaisha Komatsu Seisakusho
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 Kabushiki Kaisha Komatsu Seisakusho filed Critical Kabushiki Kaisha Komatsu Seisakusho
Publication of WO1994010453A1 publication Critical patent/WO1994010453A1/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2232—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2296—Systems with a variable displacement pump
    • 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
    • F15B11/165—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for adjusting the pump output or bypass in response to demand
    • 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
    • F15B2211/20546—Type of pump variable 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
    • 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
    • F15B2211/25—Pressure control functions
    • F15B2211/253—Pressure margin control, e.g. pump pressure in relation to load pressure
    • 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
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • 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
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40553—Flow control characterised by the type of flow control means or valve with pressure compensating valves
    • F15B2211/40569—Flow control characterised by the type of flow control means or valve with pressure compensating valves the pressure compensating valve arranged downstream of the flow control means
    • 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
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41572—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and an 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
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/428—Flow control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/40—Flow control
    • F15B2211/455—Control of flow in the feed line, i.e. meter-in control
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/605—Load sensing circuits
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • F15B2211/6054—Load sensing circuits having valve means between output member and the load sensing circuit using shuttle valves
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/605—Load sensing circuits
    • F15B2211/6058—Load sensing circuits with isolator valves
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • 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
    • F15B2211/7051—Linear output members
    • F15B2211/7052—Single-acting 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

Definitions

  • the present invention relates to a port sensing valve used for a displacement control device of a variable displacement pump used for a hydraulic circuit or the like of a work machine for a power shovel.
  • a displacement control device shown in FIG. 1 As a device for controlling the displacement (discharge amount per rotation) of a variable displacement pump, a displacement control device shown in FIG. 1 is described in Japanese Patent Application Laid-Open No. 3-107586.
  • the pressure receiving chamber 3a of the large diameter biston 3 is connected to the tank 13 side and the discharge path 1a via the load sensing valve 5, and the large diameter piston 3 is controlled by the load sensing valve 5.
  • the pressure receiving chamber 4a of the small-diameter piston 4 is connected to the discharge path 1a.
  • the capacity adjusting member 2 of the variable displacement pump 1 is operated by the large diameter stone 3 in the direction of decreasing the capacity, and the small diameter biston 4 is operated in the direction of increasing the capacity.
  • Actuators 14 ⁇ 14 2 are connected to the discharge path 1 a of the variable displacement pump 1 via operation valves 6, 6, respectively.
  • the set pressure of the compensating valves 7 and 7 is set.
  • auxiliary receiving pressure section 1 0 the optionally connected to the pressure oil source 1 1, communicating area with hydraulic auxiliary pressure receiving portion 1 0 of the hydraulic pressure of the first pressure receiving portion 5 i is pushed in a direction in which a large, second receiving pressure section 5 second hydraulic And the spring 29 is pressed in the direction in which the communication area becomes smaller.
  • the pressure oil generation source 11 generates pressure oil having a pressure proportional to the rotation speed detected by the rotation sensor 12 that detects the rotation speed of the engine 9.
  • the load sensing valve 5 is configured such that the discharge pressure P 1 + the pressure of the pressure oil of the pressure oil generation source 11 (the thrust of the auxiliary pressure receiving portion 10) and the load pressure P LS + the panel force
  • the discharge pressure P 1 + the pressure of the pressure oil of the pressure oil generation source 11 (the thrust of the auxiliary pressure receiving portion 10) and the load pressure P LS + the panel force By controlling the area of communication between the pump discharge path 1a and the pressure receiving chamber 3a of the large-diameter screw 3, the discharge flow per rotation of the variable displacement pump 1 is controlled so that the difference is constant. Is controlled.
  • An object of the present invention is to provide a load sensing valve suitable for the displacement control device. Disclosure of the invention
  • a first sleeve and a second sleeve are inserted into holes of the housing, and a first spool for communicating and blocking an inlet port, an outlet port, and a tank port is inserted into the first sleeve.
  • a load sensing valve is provided in which a first pressure receiving portion and an auxiliary pressure receiving portion are respectively formed.
  • the load sensing valve according to the best mode, characterized in that, in addition to the above configuration, an engagement projection and an engagement recess that can be engaged with and disengaged from the first sleeve and the second sleeve are respectively formed.
  • the second sleeve and the first sleeve can be connected after the stepped second spool is inserted into the second sleeve.
  • the first and second sleeves can be simultaneously inserted and inserted, so that the assembling workability is improved, and since the first and second sleeves can be simultaneously pulled out, the disassembly workability is improved.
  • the engaging projection is formed of a small-diameter circular portion concentric with the first sleeve and a large-diameter circular portion eccentric with respect to the first sleeve, and the engaging concave portion is formed of the second sleeve.
  • a first hole eccentric to the sleeve and a second hole concentric to the second sleeve are formed.
  • Fig. 1 is an explanatory diagram of the configuration of the displacement control device of a conventional variable displacement hydraulic pump. It is.
  • FIG. 2 is a sectional view of a first embodiment of the load sensing valve according to the present invention.
  • FIG. 3 is a sectional view of a second embodiment of the load sensing valve according to the present invention.
  • FIG. 4 is a cross-sectional view of the first and second sleeves of the second embodiment.
  • the load sensing valve 5 has a special shape having three pressure receiving portions and three ports, and the first embodiment of the load sensing valve according to the present invention has the structure shown in FIG. Have.
  • first sleeve 22 and the second sleeve 23 are respectively inserted into the holes 21 of the housing 20 such as a pump case and a valve body, and the first spool 24 is inserted into the first sleeve 22.
  • the second spool 25 is inserted into the second sleeve 23 to form a first pressure receiving portion 5i at the left end of the second spool 25, and the second pressure receiving portion 5i is formed at the right end of the first spool 24.
  • a second pressure receiving portion 10 is formed at an intermediate portion of the second spool 25, and the inlet port 26 is formed by sliding the second spool 25 and the first spool 24 in the left-right direction.
  • the outlet port 27 and the tank port 28 are connected and blocked.
  • one de sensing valve 5 at equal pressure receiving area of the first pressure receiving portion 5 E and the pressure receiving area of the second pressure receiving portion 5 2, and pump discharge pressure P i acting on the first pressure receiving portion 5 i first differential pressure in the first load pressure P LS acting on second pressure receiving portion 5 2, be balanced and the product, a panel force F of panel 2 9 of the second one of the pressure receiving area of the pressure receiving portion 5 5 2 And load the pump discharge pressure P i The panel force F is higher than the pressure s .
  • the second spool 24 and the first spools 25 and 24 are piled with the panel force of the panel 29 and pushed by the hydraulic pressure acting on the auxiliary pressure receiving part 10 to push the outlet port 27 and the inlet port 26. so as to communicate the, to reduce the pressure difference in the pump discharge pressure P i and the load pressure P LS weakly apparently panel force F, which enables the control micro system.
  • the second spool 25 has a small-diameter portion 25 a having a portion corresponding to the auxiliary pressure receiving portion 10 having the same diameter as the first spool 24 and a large-diameter portion 2 having a larger diameter than the first spool 24. It has a stepped shape with 5b. Therefore, if the sleeve is integrated, the stepped spool cannot be fitted, so as shown in Fig. 2, the sleeve is divided into a first sleeve 22 and a second sleeve 23, The stepped second spool 25 can be fitted together with the second sleeve 23.
  • the second and first sleeves 23, 22 are sequentially inserted into the holes 21 at the time of assembling.
  • the second sleeve 23 may not be able to be pulled out from the hole 21 easily, and the disassembly workability is poor.
  • an engagement projection 30 is formed at the distal end of the first sleeve 22, and an engagement recess 40 is formed at the base end of the second sleeve 23, and the engagement projection is formed.
  • the first and second sleeves 22 and 23 can be connected and separated by engaging and disengaging the portion 30 and the engaging recess 40.
  • the engagement convex portion 30 is connected to a small-diameter circular portion 31 concentric with the center 22 a of the first sleeve 22 and to the small-diameter circular portion 31.
  • a large-diameter circular portion 32 eccentric with respect to the center 22a of the first sleeve 22.
  • first hole 41 eccentric to a and slightly larger than the large-diameter circular portion 32; a second hole connected to the first hole 41 and having a diameter larger than the first hole 41; It is composed of a second hole 42 concentric with the center 23a of the leave 23.
  • the first and second sleeves 23 are opposed to each other with the second spool 25 fitted in the second sleeve 23, and the large-diameter circular portion 32 is formed through the first hole 41 from the first hole 41.
  • the large-diameter circular portion 32 is formed at the inner edge of the first hole 41 by the second hole. 4 Engage from the 2 side. At this time, the first sleeve 22 and the second sleeve 23 are concentric.
  • the inside of the hole 21 of the housing 20 is The first and second sleeves 22 and 23 can be simultaneously inserted to improve the assembly workability, and the first and second sleeves 22 and 23 can be simultaneously pulled out to improve the disassembly workability.
  • the load sensing valve according to the present invention is extremely used as a port sensing valve used in a displacement control device of a variable displacement pump used in a hydraulic circuit or the like for a work machine of a power shovel. Useful.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

A load sensing valve characterized in that a first sleeve (22) and a second sleeve (23) are inserted into a port (21) of a housing (20), that a first spool (24) is inserted into said first sleeve (22) for establishing and/or shutting off communications between an entrance port (26), an exit port (27) and a tank port (28), that a second pressure receiving section (52) is formed at one end of said first spool (24) for pushing said first spool (24) in a direction in which said exit port (27) and said tank port (28) are made to communicate with each other, that a second spool (25) which comprises a large diameter section and a small diameter section and is brought into abutment with the other end of said first spool (24) at one end thereof is inserted into said second sleeve (23), that a first pressure receiving section (51) and an auxiliary pressure receiving section (10) are formed at the other end of said second spool (25) and in a stepped portion thereof, respectively, for pushing said first spool (24) in a direction in which said entrance port (26) and said exit port (27) are made to communicate with each other, and that an engaging raised portion (30) and an engaging recessed portion (40) are formed for coming into and/or out of engagement with said first sleeve (22) and said second sleeve (23). With this arrangement, since the second sleeve (23) and first sleeve (22) can be connected to each other after the second spool (25) having a stepped configuration has been inserted into the second sleeve (23), the first and second sleeves (22, 23) can simultaneously be inserted into the port (21) of the housing (20) so as to improve the work efficiency for assembly, and moreover since the first and second sleeves (22, 23) can simultaneously be pulled out, it is possible to improve the work efficiency for disassembly.

Description

明細書 ロー ドセンシ ング弁 技術分野  Description Load sensing valve Technical field
この発明は、 パワーショベルの作業機用ァクチユエ一夕の油圧面 路等に用いられる可変容量ポンプの容量制御装置に使用される口一 ドセンシング弁に関する。  The present invention relates to a port sensing valve used for a displacement control device of a variable displacement pump used for a hydraulic circuit or the like of a work machine for a power shovel.
背景技術  Background art
可変容量ポンプの容量 （ 1回転当り吐出量） を制御する装置として は、 図 1 に示す容量制御装置が特開平 3— 1 0 7 5 8 6号に記載さ れている。  As a device for controlling the displacement (discharge amount per rotation) of a variable displacement pump, a displacement control device shown in FIG. 1 is described in Japanese Patent Application Laid-Open No. 3-107586.
すなわち、 大径ビス トン 3の受圧室 3 aをロードセンシング弁 5を 介してタンク 1 3側と吐出路 1 a とに接続して該ロー ドセ ンシング 弁 5で大径ピス トン 3を制御するようにし、 小径ピス ト ン 4の受圧 室 4 aを吐出路 1 aに接続している。 そして、 可変容量ポンプ 1 の 容量調整部材 2を大径ビス トン 3で容量が小さ くなる方向に作動さ せ、 小径ビス トン 4で容量が大きくなる方向に作動させるようにし ている。  That is, the pressure receiving chamber 3a of the large diameter biston 3 is connected to the tank 13 side and the discharge path 1a via the load sensing valve 5, and the large diameter piston 3 is controlled by the load sensing valve 5. Thus, the pressure receiving chamber 4a of the small-diameter piston 4 is connected to the discharge path 1a. The capacity adjusting member 2 of the variable displacement pump 1 is operated by the large diameter stone 3 in the direction of decreasing the capacity, and the small diameter biston 4 is operated in the direction of increasing the capacity.
可変容量ポンプ 1の吐出路 1 aには操作弁 6、 6を介してァクチュ ェ一タ 1 4 ぃ 1 4 2がそれぞれ接続され、 該操作弁 6、 6 とァク チユエ一夕 1 4 ぃ 1 4 2との間にそれぞれ圧力補償弁 7、 7が設け られ、 両ァクチユエ一夕 1 4】、 1 4 2にかかる負荷圧のうち最も高 い負荷圧をシャ トル弁 8で検出して両圧力補償弁 7、 7の設定圧を セッ トするようになっている。 前 Ϊ己ロー ドセンシング弁 5は、 第 1受圧部 5 をポンプ吐出路 1 a に接続し、 第 2受圧部 5 2をシャ トル弁 8の出口側に接銃し、 補助受 圧部 1 0を圧油発生源 1 1に接続していて、 第 1受圧部 5 iの油圧と 補助受圧部 1 0の油圧で連通面積が大となる方向に押され、 第 2受 圧部 5 2の油圧とバネ 2 9のパネ力で連通面積が小となる方向に押さ れるようになっている。 Actuators 14 ぃ 14 2 are connected to the discharge path 1 a of the variable displacement pump 1 via operation valves 6, 6, respectively. The operation valves 6, 6 and the actuator 14 一 1 4 second pressure compensating valves 7, 7 respectively provided between the both Akuchiyue Isseki 1 4], 1 4 detect and both pressure highest have load pressure of 2 to such load pressure in shuttle valve 8 The set pressure of the compensating valves 7 and 7 is set. Before Ϊ himself load sensing valve 5, the first pressure receiving portion 5 connected to the pump discharge passage 1 a, and Sejju the second pressure receiving portion 5 2 on the outlet side of the shuttle valve 8, auxiliary receiving pressure section 1 0 the optionally connected to the pressure oil source 1 1, communicating area with hydraulic auxiliary pressure receiving portion 1 0 of the hydraulic pressure of the first pressure receiving portion 5 i is pushed in a direction in which a large, second receiving pressure section 5 second hydraulic And the spring 29 is pressed in the direction in which the communication area becomes smaller.
該圧油発生源 1 1 は、 エンジン 9の回転数の検出する回転センサ 1 2の検出回転数に比例した圧力の圧油を発生する。  The pressure oil generation source 11 generates pressure oil having a pressure proportional to the rotation speed detected by the rotation sensor 12 that detects the rotation speed of the engine 9.
かかる容量制御装置によれば、 ロー ドセンシング弁 5は、 吐出圧 P 1 +圧油発生源 1 1の圧油の圧力 （補助受圧部 1 0の推力） と、 負荷圧 P LS +パネ力との差によって、 ポンプ吐出路 1 a と大径ビス ト ン 3の受圧室 3 a との連通面積をコン トロールすることで、 その 差が一定となるように可変容量ポンプ 1 の 1 回転当り吐出流量を制 御するようになっている。  According to such a displacement control device, the load sensing valve 5 is configured such that the discharge pressure P 1 + the pressure of the pressure oil of the pressure oil generation source 11 (the thrust of the auxiliary pressure receiving portion 10) and the load pressure P LS + the panel force By controlling the area of communication between the pump discharge path 1a and the pressure receiving chamber 3a of the large-diameter screw 3, the discharge flow per rotation of the variable displacement pump 1 is controlled so that the difference is constant. Is controlled.
この発明は、 上記容量制御装置に好適なロー ドセンシング弁を提 供することを目的と している。 発明の開示  An object of the present invention is to provide a load sensing valve suitable for the displacement control device. Disclosure of the invention
上記及び上記以外の目的を達成するために、 本発明の一態様と し て、  In order to achieve the above and other objects, as one embodiment of the present invention,
ハウジングの孔に第 1 スリーブと第 2スリーブを嵌挿し、 該第 1 スリーブ内に入口ポー トと出口ポー トとタンクポー トを連通 ， 遮断 する第 1 スプールを挿入し、 該第 1 スプールの一端に該第 1 スプ一 ルを出口ポー トとタンクポー トを連通する方向に押す第 2受圧部を 形成し、 前記第 2スリーブ内に大径部と小径部とから成り且つ一端 が第' 1スプールの他端と当接する第 2スプールを嵌挿し、 該第 2 ス プールの他端及び段付き部に前記第 1 スプールを入口ポー トと出口 ポー トとを連通する方向に押す第 1受圧部及び補助受圧部をそれぞ れ形成して成るロー ドセンシング弁が提供される。 A first sleeve and a second sleeve are inserted into holes of the housing, and a first spool for communicating and blocking an inlet port, an outlet port, and a tank port is inserted into the first sleeve. Forming a second pressure receiving portion that presses the first spool in a direction that connects the outlet port and the tank port, and includes a large-diameter portion and a small-diameter portion in the second sleeve and one end of the second pressure receiving portion; Inserts the second spool in contact with the other end of the first spool, and pushes the first spool in the other end and the stepped portion of the second spool in a direction to communicate the inlet port and the outlet port. A load sensing valve is provided in which a first pressure receiving portion and an auxiliary pressure receiving portion are respectively formed.
そして、 上記構成に加えて、 上記前記第 1 スリーブと第 2ス リーブ に係合 · 離脱可能な係合凸部と係合凹部をそれぞれ形成したことを 特徴とするロー ドセンシング弁が最良の形態のものと して提供され この構成によれば、 第 2スリーブに段付形状の第 2スプールを挿 入した後に第 2ス リーブと第 1 ス リーブを連結できるから、 ハウジ ングの孔内には第 1 , 第 2スリ一ブを同時に嵌挿できて組立作業性 が向上するし、 第 1 , 第 2 ス リーブを同時に引き抜きできるから分 解作業性が向上する。  The load sensing valve according to the best mode, characterized in that, in addition to the above configuration, an engagement projection and an engagement recess that can be engaged with and disengaged from the first sleeve and the second sleeve are respectively formed. According to this configuration, the second sleeve and the first sleeve can be connected after the stepped second spool is inserted into the second sleeve. The first and second sleeves can be simultaneously inserted and inserted, so that the assembling workability is improved, and since the first and second sleeves can be simultaneously pulled out, the disassembly workability is improved.
尚、 好ま しく は、 前記係合凸部を第 1 スリーブに対して同心状の 小径円形部と第 1 ス リーブに対して偏心した大径円形部よ り形成 し、 前記係合凹部を第 2 スリ一ブに対して偏心した第 1孔と第 2 ス リーブに対して同心状の第 2孔より形成する。 図面の簡単な説明  Preferably, the engaging projection is formed of a small-diameter circular portion concentric with the first sleeve and a large-diameter circular portion eccentric with respect to the first sleeve, and the engaging concave portion is formed of the second sleeve. A first hole eccentric to the sleeve and a second hole concentric to the second sleeve are formed. BRIEF DESCRIPTION OF THE FIGURES
本発明は、 以下の詳細な説明及び本発明の実施例を示す添付図面 により、 より良く理解されるものとなろう。 なお、 添付図面に示す 実施例は、 発明を特定することを意図するものではなく、 単に説明 及び理解を容易とするものである。  The present invention will be better understood from the following detailed description and the accompanying drawings, which illustrate embodiments of the invention. The embodiments shown in the accompanying drawings are not intended to specify the present invention, but merely to facilitate explanation and understanding.
図中、  In the figure,
図 1 は、 従来の可変容量油圧ポンプの容量制御装置の構成説明図 である。 Fig. 1 is an explanatory diagram of the configuration of the displacement control device of a conventional variable displacement hydraulic pump. It is.
図 2は、 本発明によるロー ドセンシング弁の第 1実施例の断面図 である。  FIG. 2 is a sectional view of a first embodiment of the load sensing valve according to the present invention.
図 3は、 本発明によるロー ドセンシング弁の第 2実施例の断面図 である。  FIG. 3 is a sectional view of a second embodiment of the load sensing valve according to the present invention.
図 4は、 上記第 2実施例の第 1 , 第 2スリーブの断面図である。 発明を実施するための最良の形態  FIG. 4 is a cross-sectional view of the first and second sleeves of the second embodiment. BEST MODE FOR CARRYING OUT THE INVENTION
前述のように、 ロー ドセンシング弁 5は、 3つの受圧部と 3つの ポー トを有する特殊形状となっており、 本発明によるロー ドセンシ ング弁の第 1実施例は、 図 2に示す構造を有している。  As described above, the load sensing valve 5 has a special shape having three pressure receiving portions and three ports, and the first embodiment of the load sensing valve according to the present invention has the structure shown in FIG. Have.
すなわち、 ポンプケースや弁本体等のハウジング 2 0の孔 2 1内に 第 1スリーブ 2 2 と第 2スリーブ 2 3をそれぞれ嵌挿し、 その第 1 スリーブ 2 2内に第 1スプール 2 4を嵌揷すると共に、 第 2スリー ブ 2 3内に第 2スプール 2 5を嵌挿して、 第 2スプール 2 5の左端 に第 1受圧部 5 iを形成し、 第 1 スプール 2 4の右端に第 2受圧部 5 2を形成し、 第 2スプール 2 5の中間部に補助受圧部 1 0を形成 し、 第 2スプール 2 5及び第 1スプール 2 4の左右方向の摺動によ り入口ポー ト 2 6、 出口ポー ト 2 7、 タンクポー ト 2 8を連通 · 遮 断するようにしてある。 That is, the first sleeve 22 and the second sleeve 23 are respectively inserted into the holes 21 of the housing 20 such as a pump case and a valve body, and the first spool 24 is inserted into the first sleeve 22. At the same time, the second spool 25 is inserted into the second sleeve 23 to form a first pressure receiving portion 5i at the left end of the second spool 25, and the second pressure receiving portion 5i is formed at the right end of the first spool 24. A second pressure receiving portion 10 is formed at an intermediate portion of the second spool 25, and the inlet port 26 is formed by sliding the second spool 25 and the first spool 24 in the left-right direction. The outlet port 27 and the tank port 28 are connected and blocked.
かかる口一 ドセンシング弁 5では、 第 1受圧部 5 ェの受圧面積と第 2受圧部 5 2の受圧面積を等しく して、 第 1受圧部 5 iに作用するポ ンプ吐出圧 P iと第 2受圧部 5 2に作用する負荷圧 P LSとの差圧と第 1 , 第 2受圧部 5 5 2のいずれか一方の受圧面積の積と、 パネ 2 9のパネ力 Fとをバランスさせることで、 ポンプ吐出圧 P iを負荷 圧 sより も 'パネ力 Fだけ高圧としている。 In accordance mouth one de sensing valve 5, at equal pressure receiving area of the first pressure receiving portion 5 E and the pressure receiving area of the second pressure receiving portion 5 2, and pump discharge pressure P i acting on the first pressure receiving portion 5 i first differential pressure in the first load pressure P LS acting on second pressure receiving portion 5 2, be balanced and the product, a panel force F of panel 2 9 of the second one of the pressure receiving area of the pressure receiving portion 5 5 2 And load the pump discharge pressure P i The panel force F is higher than the pressure s .
また、 補助受圧部 1 0に作用する油圧で第 2スプール 2 4， 第 1ス プール 2 5 , 2 4をパネ 2 9のパネ力に杭して押して出口ポー ト 2 7 と入口ポー ト 2 6を連通させるようにして、 見かけ上パネ力 F を弱く してポンプ吐出圧 P iと負荷圧 P L Sの差圧を小さく し、 微小制 御を可能にしている。 Also, the second spool 24 and the first spools 25 and 24 are piled with the panel force of the panel 29 and pushed by the hydraulic pressure acting on the auxiliary pressure receiving part 10 to push the outlet port 27 and the inlet port 26. so as to communicate the, to reduce the pressure difference in the pump discharge pressure P i and the load pressure P LS weakly apparently panel force F, which enables the control micro system.
このために、 第 2スプール 2 5は、 補助受圧部 1 0に対応する部分 が第 1 スプール 2 4 と同一径の小径部 2 5 a と第 1 スプール 2 4よ り大径の大径部 2 5 bを有する段付形状となっている。 そのため、 スリーブを一体とすると段付形状のスプールを嵌揷できないから、 図 2に示すように、 スリ ーブを第 1 ス リ ーブ 2 2 と第 2ス リ ーブ 2 3に分けて、 第 2スリーブ 2 3 と一緒に段付形状の第 2スプール 2 5を嵌揷できるようにしてある。  For this reason, the second spool 25 has a small-diameter portion 25 a having a portion corresponding to the auxiliary pressure receiving portion 10 having the same diameter as the first spool 24 and a large-diameter portion 2 having a larger diameter than the first spool 24. It has a stepped shape with 5b. Therefore, if the sleeve is integrated, the stepped spool cannot be fitted, so as shown in Fig. 2, the sleeve is divided into a first sleeve 22 and a second sleeve 23, The stepped second spool 25 can be fitted together with the second sleeve 23.
ところが、 このような構造のロー ドセンシング弁では、 その組立時 には孔 2 1 内に第 2 , 第 1 スリーブ 2 3 , 2 2を順次挿入すること になるから組立作業性が悪いし、 分解する場合には第 2ス リ ーブ 2 3を孔 2 1 より抜き出しできないことも起こ り易くて、 分解作業' 性が悪いものとなる。  However, in the load sensing valve having such a structure, the second and first sleeves 23, 22 are sequentially inserted into the holes 21 at the time of assembling. In such a case, the second sleeve 23 may not be able to be pulled out from the hole 21 easily, and the disassembly workability is poor.
そこで、 組立作業性、 分解作業性を向上するようにしたロー ドセン シング弁を、 本発明の第 2実施例として図 3及び図 4を参照しなが ら説明する。  Therefore, a load sensing valve designed to improve the workability of assembling and disassembling will be described as a second embodiment of the present invention with reference to FIGS.
図 3に示すように、 第 1スリーブ 2 2の先端部に係合凸部 3 0を形 成し、 第 2スリーブ 2 3の基端部に係合凹部 4 0を形成し、 その係 合凸部 3 0 と係合凹部 4 0を係合、 離脱可能に して第 1 , 第 2ス リーブ 2 2 , 2 3を連結、 分離可能にしてある。 前記係合凸'部 3 0は、 図 4に示すように、 第 1スリーブ 2 2の中心 2 2 aに対して同心状の小径円形部 3 1 と、 該小径円形部 3 1 に連 続し且つ第 1 スリーブ 2 2の中心 2 2 aに対して偏心した大径円形 部 3 2 とより成り、 係合凹部 4 0は、 図 4に示すように、 第 2 ス リーブ 2 3の中心 2 3 aに対して偏心しかつ前記大径円形部 3 2よ り若干大径の第 1孔 4 1 と、 この第 1孔 4 1 に連続し且つ該第 1孔 4 1 より大径で第 2ス リーブ 2 3の中心 2 3 aに対して同心状の第 2孔 4 2 とより成っている。 As shown in FIG. 3, an engagement projection 30 is formed at the distal end of the first sleeve 22, and an engagement recess 40 is formed at the base end of the second sleeve 23, and the engagement projection is formed. The first and second sleeves 22 and 23 can be connected and separated by engaging and disengaging the portion 30 and the engaging recess 40. As shown in FIG. 4, the engagement convex portion 30 is connected to a small-diameter circular portion 31 concentric with the center 22 a of the first sleeve 22 and to the small-diameter circular portion 31. And a large-diameter circular portion 32 eccentric with respect to the center 22a of the first sleeve 22. The engaging recess 40, as shown in FIG. a first hole 41 eccentric to a and slightly larger than the large-diameter circular portion 32; a second hole connected to the first hole 41 and having a diameter larger than the first hole 41; It is composed of a second hole 42 concentric with the center 23a of the leave 23.
このようであるから、 第 2スリーブ 2 3内に第 2スプール 2 5を嵌 挿した状態で第 1 , 第 2スリーブ 2 3を対向させ、 大径円形部 3 2 を第 1孔 4 1 より第 2孔 4 2内に挿入し、 第 1 ス リーブ 2 2 と第 2 ス リーブ 2 3を相対的に回転するこ とで大径円形部 3 2が第 1 孔 4 1 の内縁部に第 2孔 4 2側から係合する。 尚、 この時、 第 1 ス リーブ 2 2 と第 2スリーブ 2 3は同心状となっている。  Because of this, the first and second sleeves 23 are opposed to each other with the second spool 25 fitted in the second sleeve 23, and the large-diameter circular portion 32 is formed through the first hole 41 from the first hole 41. By inserting the first sleeve 22 and the second sleeve 23 relatively into the second hole 42, the large-diameter circular portion 32 is formed at the inner edge of the first hole 41 by the second hole. 4 Engage from the 2 side. At this time, the first sleeve 22 and the second sleeve 23 are concentric.
上述のように、 第 2スリーブ 2 3に段付形状の第 2スプール 2 5 を挿入した後に第 2スリーブ 2 3と第 1 スリーブ 2 2を連結できる から、 ハウジング 2 0の孔 2 1 内には第 1 , 第 2ス リ ーブ 2 2 , 2 3を同時に嵌挿できて組立作業性が向上する し、 第 1 , 第 2 ス リーブ 2 2 , 2 3を同時に引き抜きできるから分解作業性が向上す る。  As described above, since the second sleeve 23 and the first sleeve 22 can be connected after the stepped second spool 25 is inserted into the second sleeve 23, the inside of the hole 21 of the housing 20 is The first and second sleeves 22 and 23 can be simultaneously inserted to improve the assembly workability, and the first and second sleeves 22 and 23 can be simultaneously pulled out to improve the disassembly workability. You.
なお、 本発明は例示的な実施例について説明したが、 開示した実 施例に関して、 本発明の要旨及び範囲を逸脱することなく、 種々の 変更、 省略、 追加が可能であることは、 当業者において自明であ る。 従って、 本発明は、 上記の実施例に限定されるものではなく、 請求の範囲に記載された要素によって規定される範囲及びその均等 範囲 包含す'るものとして理解されなければならない。 産業上の利用可能性 Although the present invention has been described with reference to exemplary embodiments, it is understood by those skilled in the art that various modifications, omissions, and additions can be made to the disclosed embodiments without departing from the spirit and scope of the present invention. It is obvious in. Therefore, the present invention is not limited to the above-described embodiment, but includes the scope defined by the elements described in the claims, and equivalents thereof. Scope must be understood as inclusive. Industrial applicability
以上のように、 本発明に係るロー ドセンシング弁は、 パワーショ ベルの作業機用ァクチユエ一夕の油圧回路等に用いられる可変容量 ポンプの容量制御装置に使用される口一 ドセンシング弁として極め て有用である。  As described above, the load sensing valve according to the present invention is extremely used as a port sensing valve used in a displacement control device of a variable displacement pump used in a hydraulic circuit or the like for a work machine of a power shovel. Useful.

Claims

' " 請求の範囲 '" The scope of the claims
1 . ハウジングの孔に第 1 スリーブと第 2スリーブを嵌挿し、 該 第 1 ス リーブ内に入口ポー トと出口ポー トとタンクポー トを連通 · 遮断する第 1 スプールを挿入し、 該第 1 スプールの一端に該第 1 ス プールを出口ポー トとタンクポー トを連通する方向に押す第 2受圧 部を形成し、 前記第 2スリーブ内に大径部と小径部とから成り且つ 一端が第 1 スプールの他端と当接する第 2スプールを嵌挿し、 該第 2 スプールの他端及び段付き部に前記第 1 スプールを入口ポー トと 出口ポー トとを連通する方向に押す第 1受圧部及び補助受圧部をそ れぞれ形成し、 前記第 1スリーブと第 2 ス リーブに係合 · 離脱可能 な係合凸部と係合凹部をそれぞれ形成したロー ドセンシング弁。 1. Insert the first sleeve and the second sleeve into the holes of the housing, and insert the first spool into and out of the first sleeve to communicate and shut off the inlet port, the outlet port and the tank port. A second pressure receiving portion for pressing the first spool in a direction connecting the outlet port and the tank port is formed at one end of the first spool. A first pressure receiving portion and an auxiliary member for pushing the second spool into the other end and the stepped portion of the second spool so as to connect the inlet port and the outlet port with each other. A load sensing valve in which pressure receiving portions are respectively formed, and an engagement convex portion and an engagement concave portion are formed on the first sleeve and the second sleeve so as to be capable of engaging and disengaging.
2 . 前記係合凸部を第 1 スリーブに対して同心状の小径円形部と 第 1 ス リーブに対して偏心した大径円形部より形成し、 前記係合凹 部を第 2スリーブに対して偏心した第 1孔と第 2スリーブに対して 同心状の第 2孔より形成し、 前記大径円形部を前記第 1孔より前記 第 2孔内に挿入し、 第 1 ス リーブと第 2ス リーブを相対的に回転す ることで前記大径円形部が前記第 1孔の内縁部に係合するようにし たことを特徴とする、 請求項 1 に記載のロー ドセンシング弁。 2. The engaging convex portion is formed of a small-diameter circular portion concentric with the first sleeve and a large-diameter circular portion eccentric with the first sleeve, and the engaging concave portion is formed with respect to the second sleeve. An eccentric first hole and a second sleeve are formed from a concentric second hole with respect to the eccentric first hole and the second sleeve is inserted into the second hole from the first hole through the first sleeve and the second sleeve. The load sensing valve according to claim 1, wherein the large-diameter circular portion is engaged with an inner edge of the first hole by relatively rotating the leave.
PCT/JP1993/001533 1992-10-23 1993-10-22 Load sensing valve WO1994010453A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP28563392A JPH06137303A (en) 1992-10-23 1992-10-23 Load sensing valve
JP4/285633 1992-10-23

Publications (1)

Publication Number Publication Date
WO1994010453A1 true WO1994010453A1 (en) 1994-05-11

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JP (1) JPH06137303A (en)
WO (1) WO1994010453A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0238078Y2 (en) * 1984-07-31 1990-10-15
JPH03107586A (en) * 1989-09-22 1991-05-07 Komatsu Ltd Capacity controller of variable capacity pump

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0238078Y2 (en) * 1984-07-31 1990-10-15
JPH03107586A (en) * 1989-09-22 1991-05-07 Komatsu Ltd Capacity controller of variable capacity pump

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