US20160130787A1 - Flow rate control valve for construction machine - Google Patents

Flow rate control valve for construction machine Download PDF

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Publication number
US20160130787A1
US20160130787A1 US14/897,446 US201314897446A US2016130787A1 US 20160130787 A1 US20160130787 A1 US 20160130787A1 US 201314897446 A US201314897446 A US 201314897446A US 2016130787 A1 US2016130787 A1 US 2016130787A1
Authority
US
United States
Prior art keywords
spool
control valve
flow rate
rate control
orifice
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.)
Abandoned
Application number
US14/897,446
Other languages
English (en)
Inventor
Sung-Bok Park
Jin-Youn Choi
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.)
Volvo Construction Equipment AB
Original Assignee
Volvo Construction Equipment AB
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 Volvo Construction Equipment AB filed Critical Volvo Construction Equipment AB
Assigned to VOLVO CONSTRUCTION EQUIPMENT AB reassignment VOLVO CONSTRUCTION EQUIPMENT AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHOI, JIN-YOUN, PARK, SUNG-BOK
Publication of US20160130787A1 publication Critical patent/US20160130787A1/en
Abandoned legal-status Critical Current

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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
    • F15B13/04—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
    • 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
    • E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
    • E02F3/435—Control of dipper or bucket position; Control of sequence of drive operations for dipper-arms, backhoes or the like
    • 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
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2267—Valves or distributors
    • 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
    • E02F9/2285—Pilot-operated systems
    • 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
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
    • F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
    • F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
    • F16K11/0716—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides with fluid passages through the valve member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
    • F16K31/363—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor the fluid acting on a piston
    • 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

Definitions

  • the present invention relates to a flow rate control valve for a construction machine. More particularly, the present invention relates to such a flow rate control valve for a construction machine, which can control hydraulic fluid supplied from a hydraulic pump to a hydraulic actuator.
  • a flow rate control valve 3 for a construction machine which is configured to control hydraulic fluid supplied from a hydraulic pump 1 to a hydraulic actuator 2 (e.g., boom cylinder) when a spool is shifted in response to a signal pressure applied thereto from a remote control valve (RCV) A.
  • a hydraulic actuator 2 e.g., boom cylinder
  • RCV remote control valve
  • the flow rate control valve for a construction machine includes:
  • the hydraulic fluid discharged from the hydraulic actuator 2 is returned to the hydraulic fluid tank T via the actuator port 8 , a notch 10 b of the spool 10 , and the tank path 11 in this order.
  • the hydraulic actuator 2 can be driven in a stretchable manner to perform a boom-up operation.
  • the flow rate control valve 3 in accordance with the prior art allows the spool 10 to be shifted in response to the signal pressure applied to the spool by the manipulation of the remote control valve A to control the hydraulic fluid supplied from the hydraulic pump 1 to the hydraulic actuator 2 and operate the work apparatus such as a boom, an arm, or a bucket through the drive of the hydraulic actuator 2 .
  • the remote control valve A is manipulated by using an operator's hand or foot, and thus there is a limitation in finely and smoothly manipulating the remote control valve A to the extent to which the operator desires. For example, this is the case where the remote control valve A is manipulated in an initial stage to initiate the leveling work in a state in which the work apparatus 5 is stretched to the maximum.
  • an arm manipulation amount i.e., in an arm-in or arm-out operation
  • a boom manipulation amount i.e., in a boom-up or boom-down operation
  • the present invention has been made to solve the aforementioned problems occurring in the prior art, and it is an object of the present invention to provide a flow rate control valve for a construction machine, in which a spool of the flow rate control valve that controls hydraulic fluid supplied to a work apparatus is prevented from being excessively manipulated in an initial stage of the operation of the spool, and a shock can be prevented from occurring in the work apparatus due to the sudden shift of the spool at the initial operation stage of the spool.
  • a flow rate control valve for a construction machine including:
  • the hydraulic actuator may include at least one of a boom cylinder, an arm cylinder, and a bucket cylinder.
  • the outlet 13 of the orifice may be formed at a position that is spaced apart by a predetermined distance from the end portion of the spool to which the signal pressure is applied so that the orifice is closed after the spool is moved over a predetermined distance in response to the signal pressure applied thereto.
  • the orifice may be formed at at least one of both ends of the spool.
  • the flow rate control valve for a construction machine in accordance with the present invention as constructed above has the following advantages.
  • the excessive manipulation of the spool of the flow rate control valve can be avoided at the initial stage of the operation of the spool.
  • a shock can be prevented from occurring in the work apparatus due to the sudden shift of the spool.
  • the shock occurring at the initial stage of the operation of the spool of the flow rate control valve is minimized so that the work apparatus can be performed smoothly, thereby improving the workability during the leveling work using an excavator and relieving an operator's fatigue.
  • FIG. 1 is a diagrammatic view showing a neutral state of a spool in a flow rate control valve for a construction machine in accordance with the prior art
  • FIG. 2 is a diagrammatic view showing an initial stage of the operation of the spool in the flow rate control valve shown in FIG. 1 ;
  • FIG. 3 is an enlarged view showing main elements of the flow rate control valve in initial stage of the operation of the spool shown in FIG. 2 ;
  • FIG. 4 is a diagrammatic view showing a neutral state of a spool in a flow rate control valve for a construction machine in accordance with a preferred embodiment of the present invention
  • FIG. 5 is a diagrammatic view showing an initial stage of the operation of the spool in the flow rate control valve shown in FIG. 4 ;
  • FIG. 6 is an enlarged view showing main elements of the flow rate control valve in initial stage of the operation of the spool shown in FIG. 5 ;
  • FIG. 7 is a diagrammatic view showing a state in which the spool is moved over a predetermined distance in the flow rate control valve shown in FIG. 4 ;
  • FIG. 8 is an enlarged view showing main elements of the flow rate control valve in which the spool shown in FIG. 7 is moved over a predetermined distance.
  • FIG. 4 is a diagrammatic view showing a neutral state of a spool in a flow rate control valve for a construction machine in accordance with a preferred embodiment of the present invention
  • FIG. 5 is a diagrammatic view showing an initial stage of the operation of the spool in the flow rate control valve shown in FIG. 4
  • FIG. 6 is an enlarged view showing main elements of the flow rate control valve in initial stage of the operation of the spool shown in FIG. 5
  • FIG. 7 is a diagrammatic view showing a state in which the spool is moved over a predetermined distance in the flow rate control valve shown in FIG. 4
  • FIG. 8 is an enlarged view showing main elements of the flow rate control valve in which the spool shown in FIG. 7 is moved over a predetermined distance.
  • a flow rate control valve 3 for a construction machine which is configured to control hydraulic fluid supplied from a hydraulic pump 1 to a hydraulic actuator 2 when a spool is shifted in response to a signal pressure applied thereto from a remote control valve (RCV) A.
  • RCV remote control valve
  • the flow rate control valve 3 for a construction machine includes:
  • the hydraulic actuator 2 is at least one of a boom cylinder, an arm cylinder, and a bucket cylinder.
  • the outlet 13 of the orifice 14 is formed at a position that is spaced apart by a predetermined distance from the end portion of the spool 10 to which the signal pressure is applied so that the orifice 14 is closed after the spool 10 is moved over a predetermined distance in response to the signal pressure applied thereto.
  • the orifice 14 is formed at at least one of both ends of the spool 10 .
  • the orifice 14 is formed at a left end of the spool 10 .
  • a lever of the remote control valve A is held in a neutral position, and thus the spool 10 of the flow rate control valve 3 is also held in a neutral position. For this reason, because the supply path 6 is blocked from fluidically communicating with the pump path 4 to which the hydraulic fluid from the hydraulic pump 1 is supplied, the hydraulic fluid is not supplied to the hydraulic actuator 2 .
  • the signal pressure is applied to a signal pressure port at a left side of the flow rate control valve 3 to press a left end of the spool 10 to cause the spool to be shifted to the right on the drawing sheet.
  • the hydraulic fluid from the hydraulic pump is supplied to the hydraulic actuator 2 via the pump path 4 , the supply path 6 , a notch 10 a of the spool 10 , and the actuator port 7 in this order in response to the shift of the spool 10 .
  • the hydraulic fluid discharged from the hydraulic actuator 2 is returned to the hydraulic fluid tank T via the actuator port 8 , a notch 10 b of the spool 10 , and the tank path 11 in this order.
  • the hydraulic actuator 2 can be driven in a stretchable manner to perform a boom-up operation.
  • part of the signal pressure applied to the signal pressure port of the valve body 9 shifts the spool 10 to cause the hydraulic fluid from the hydraulic pump to be supplied to the hydraulic actuator 2 , and part of the signal pressure is introduced into the spool 10 through the inlet 12 of the orifice 14 formed at the end portion of the spool 10 and then is bled to the hydraulic fluid tank T through the outlet 13 of the orifice 14 .
  • part of the signal pressure applied from the remote control valve A to the spool 10 is bled to the hydraulic fluid tank T through the orifice 14 so that the sudden operation of the spool 10 can be prevented at the initial operation stage of the spool 10 .
  • the shock or the sudden operation of the hydraulic actuator 2 is prevented, and thus the work apparatus 5 can be operated smoothly.
  • the excessive manipulation of the spool of the flow rate control valve can be avoided at the initial stage of the operation of the spool.
  • the sudden shift of the spool of the flow rate control valve is restricted so that the shock and the sudden operation that occur during the initial operation of the work apparatus can be minimized.
  • the spool of the flow rate control valve is shifted over a predetermined distance to cause the orifice 14 to be closed so that the unnecessary loss of flow rate can be prevented.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)
US14/897,446 2013-06-14 2013-06-14 Flow rate control valve for construction machine Abandoned US20160130787A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2013/005257 WO2014200131A1 (fr) 2013-06-14 2013-06-14 Soupape de commande de débit pour machine de construction

Publications (1)

Publication Number Publication Date
US20160130787A1 true US20160130787A1 (en) 2016-05-12

Family

ID=52022414

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/897,446 Abandoned US20160130787A1 (en) 2013-06-14 2013-06-14 Flow rate control valve for construction machine

Country Status (6)

Country Link
US (1) US20160130787A1 (fr)
EP (1) EP3009690A4 (fr)
KR (1) KR20160018548A (fr)
CN (1) CN105408639A (fr)
CA (1) CA2915009A1 (fr)
WO (1) WO2014200131A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018159401A (ja) * 2017-03-22 2018-10-11 株式会社クボタ 作業機の油圧システム
WO2020090587A1 (fr) * 2018-11-01 2020-05-07 Ｋｙｂ株式会社 Vanne de régulation

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2025149337A (ja) 2024-03-26 2025-10-08 株式会社クボタ 作業機及び作業機の制御方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8151688B2 (en) * 2008-02-19 2012-04-10 Kobelco Construction Machinery Co., Ltd. Hydraulic circuit of construction machine

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JPH06300006A (ja) * 1993-04-14 1994-10-25 Kato Works Co Ltd 油圧駆動制御装置
JP2001165349A (ja) * 1999-12-09 2001-06-22 Hitachi Constr Mach Co Ltd 方向制御弁
JP4532725B2 (ja) * 2000-12-11 2010-08-25 ヤンマー株式会社 掘削旋回作業車のブーム用方向切換弁
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JP2003269626A (ja) * 2002-03-12 2003-09-25 Toshiba Mach Co Ltd スプール切換弁
KR100611713B1 (ko) * 2004-10-14 2006-08-11 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 재생기능을 구비한 유압제어밸브
JP2008002663A (ja) * 2006-06-26 2008-01-10 Hitachi Constr Mach Co Ltd スプール弁装置
US9309901B2 (en) * 2011-07-12 2016-04-12 Volvo Construction Equipment Ab Flow control valve for construction machinery

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8151688B2 (en) * 2008-02-19 2012-04-10 Kobelco Construction Machinery Co., Ltd. Hydraulic circuit of construction machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018159401A (ja) * 2017-03-22 2018-10-11 株式会社クボタ 作業機の油圧システム
WO2020090587A1 (fr) * 2018-11-01 2020-05-07 Ｋｙｂ株式会社 Vanne de régulation
JP2020070904A (ja) * 2018-11-01 2020-05-07 Ｋｙｂ株式会社 制御弁
JP7093287B2 (ja) 2018-11-01 2022-06-29 Ｋｙｂ株式会社 制御弁

Also Published As

Publication number Publication date
EP3009690A4 (fr) 2017-01-25
CN105408639A (zh) 2016-03-16
WO2014200131A1 (fr) 2014-12-18
KR20160018548A (ko) 2016-02-17
EP3009690A1 (fr) 2016-04-20
CA2915009A1 (fr) 2014-12-18

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Legal Events

Date Code Title Description
AS Assignment

Owner name: VOLVO CONSTRUCTION EQUIPMENT AB, SWEDEN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:PARK, SUNG-BOK;CHOI, JIN-YOUN;REEL/FRAME:037262/0731

Effective date: 20151208

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION