EP2937472A4 - Construction machine with floating function - Google Patents

Construction machine with floating function

Info

Publication number
EP2937472A4
EP2937472A4 EP12890478.6A EP12890478A EP2937472A4 EP 2937472 A4 EP2937472 A4 EP 2937472A4 EP 12890478 A EP12890478 A EP 12890478A EP 2937472 A4 EP2937472 A4 EP 2937472A4
Authority
EP
European Patent Office
Prior art keywords
construction machine
floating function
floating
function
construction
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.)
Withdrawn
Application number
EP12890478.6A
Other languages
German (de)
French (fr)
Other versions
EP2937472A1 (en
Inventor
Won-Cheol Jeong
Se-Rib Jee
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
Publication of EP2937472A1 publication Critical patent/EP2937472A1/en
Publication of EP2937472A4 publication Critical patent/EP2937472A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
    • E02F3/80—Component parts
    • E02F3/84—Drives or control devices therefor, e.g. hydraulic drive systems
    • E02F3/844—Drives or control devices therefor, e.g. hydraulic drive systems for positioning the blade, e.g. hydraulically
    • 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
    • E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
    • 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
    • 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
    • E02F9/2292—Systems with two or more pumps
    • 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
    • F15B11/003—Systems with load-holding 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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F15B2211/3051—Cross-check 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
    • F15B2211/30—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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/77—Control of direction of movement of the output member
    • F15B2211/7741—Control of direction of movement of the output member with floating mode, e.g. using a direct connection between both lines of a double-acting cylinder
EP12890478.6A 2012-12-20 2012-12-20 Construction machine with floating function Withdrawn EP2937472A4 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2012/011178 WO2014098284A1 (en) 2012-12-20 2012-12-20 Construction machine with floating function

Publications (2)

Publication Number Publication Date
EP2937472A1 EP2937472A1 (en) 2015-10-28
EP2937472A4 true EP2937472A4 (en) 2016-09-07

Family

ID=50978579

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12890478.6A Withdrawn EP2937472A4 (en) 2012-12-20 2012-12-20 Construction machine with floating function

Country Status (5)

Country Link
US (1) US20150315768A1 (en)
EP (1) EP2937472A4 (en)
KR (1) KR101741702B1 (en)
AU (1) AU2012397386B2 (en)
WO (1) WO2014098284A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112013006501T5 (en) * 2013-01-24 2016-03-31 Volvo Construction Equipment Ab Apparatus and method for controlling a flow rate of construction machinery
WO2016195374A1 (en) * 2015-06-02 2016-12-08 두산인프라코어 주식회사 Hydraulic system of construction machine
US10641388B2 (en) 2015-12-07 2020-05-05 Kubota Corporation Hydraulic system of work machine and work machine
KR102491222B1 (en) * 2015-12-11 2023-01-25 주식회사 대동 Hydraulic circuit for working machine lifting and floating
CN110158682B (en) * 2019-05-06 2021-07-02 广西柳工机械股份有限公司 Hydraulic system of land leveler working device
CN113323071B (en) * 2021-05-14 2023-02-24 安徽铜冠机械股份有限公司 Floating control unit of underground carry scraper bucket

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0831181A1 (en) * 1996-09-20 1998-03-25 Shin Caterpillar Mitsubishi Ltd. Hydraulic circuit
US6092454A (en) * 1998-07-23 2000-07-25 Caterpillar Inc. Controlled float circuit for an actuator
US20040221714A1 (en) * 2003-02-21 2004-11-11 Marcus Bitter Hydraulic control circuit for a hydraulic lifting cylinder
CN101220823A (en) * 2006-11-14 2008-07-16 胡斯可国际股份有限公司 Energy recovery and reuse methods for a hydraulic system
EP2378009A2 (en) * 2008-11-19 2011-10-19 Doosan Infracore Co., Ltd. Boom cylinder control circuit for construction machine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4166506A (en) * 1975-06-30 1979-09-04 Kabushiki Kaisha Komatsu Seisakusho Controlling apparatus for bulldozer blade
US4282798A (en) * 1979-10-22 1981-08-11 Ex-Cell-O Corporation Control valve unit for hydraulic linear actuator
US4359931A (en) * 1981-01-19 1982-11-23 The Warner & Swasey Company Regenerative and anticavitation hydraulic system for an excavator
JP2002088796A (en) * 2000-09-19 2002-03-27 Kobelco Contstruction Machinery Ltd Dozer device
US6892535B2 (en) * 2002-06-14 2005-05-17 Volvo Construction Equipment Holding Sweden Ab Hydraulic circuit for boom cylinder combination having float function
KR100849500B1 (en) * 2006-11-29 2008-07-31 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 double check valve with floating function

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0831181A1 (en) * 1996-09-20 1998-03-25 Shin Caterpillar Mitsubishi Ltd. Hydraulic circuit
US6092454A (en) * 1998-07-23 2000-07-25 Caterpillar Inc. Controlled float circuit for an actuator
US20040221714A1 (en) * 2003-02-21 2004-11-11 Marcus Bitter Hydraulic control circuit for a hydraulic lifting cylinder
CN101220823A (en) * 2006-11-14 2008-07-16 胡斯可国际股份有限公司 Energy recovery and reuse methods for a hydraulic system
EP2378009A2 (en) * 2008-11-19 2011-10-19 Doosan Infracore Co., Ltd. Boom cylinder control circuit for construction machine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2014098284A1 *

Also Published As

Publication number Publication date
AU2012397386B2 (en) 2016-05-19
AU2012397386A1 (en) 2015-07-09
KR20150092168A (en) 2015-08-12
KR101741702B1 (en) 2017-05-30
WO2014098284A1 (en) 2014-06-26
US20150315768A1 (en) 2015-11-05
EP2937472A1 (en) 2015-10-28

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