EP1832686A1 - Hydraulische Verriegelungsvorrichtung - Google Patents

Hydraulische Verriegelungsvorrichtung Download PDF

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Publication number
EP1832686A1
EP1832686A1 EP06118421A EP06118421A EP1832686A1 EP 1832686 A1 EP1832686 A1 EP 1832686A1 EP 06118421 A EP06118421 A EP 06118421A EP 06118421 A EP06118421 A EP 06118421A EP 1832686 A1 EP1832686 A1 EP 1832686A1
Authority
EP
European Patent Office
Prior art keywords
hydraulically
hydraulic
valve
controlled
unloading valve
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Withdrawn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
EP06118421A
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English (en)
French (fr)
Inventor
Qinghua He
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1832686A1 publication Critical patent/EP1832686A1/de
Withdrawn legal-status Critical Current

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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
    • E02F9/2253—Controlling the travelling speed of vehicles, e.g. adjusting travelling speed according to implement loads, control of hydrostatic transmission
    • 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
    • E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
    • 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

Definitions

  • This invention relates to a hydraulic excavator, and more particularly, to a hydraulically-controlled lock apparatus for a hydraulic excavator.
  • the travel of a hydraulic excavator is driven by a main pump that supplies power to a travel motor through a main control valve.
  • the travel and stop of a hydraulic excavator are controlled by manipulating the main control valve through a mechanical lever.
  • the main control valve needs to be manipulated so as to connect the main pump with the travel motor, which supplies power to the travel motor, so as to realize a travel mode.
  • the main control valve needs to be manipulated so as to disconnect the main pump with the travel motor to lose its power, and thus to realize a stop mode.
  • the travel mechanism While the hydraulic excavator is in a stop mode, the travel mechanism must be locked to prevent the main pump from connecting to the travel motor, and thus to avoid any accidents.
  • the lock of a travel mechanism is achieved by a mechanical lock apparatus to lock the mechanical lever, which then locks the main control valve, and finally locks the travel mechanism.
  • this type of mechanical apparatus causes the loss of fluid return pressure of the hydraulic manipulating valve, and has the disadvantages of complicated configuration, difficult manufacture and maintenance, and overall high cost.
  • the objective of the present invention is to provide a hydraulically-controlled lock apparatus for the travel of a hydraulic excavator having the features of simple structure, easy manipulation, reliable operation, and high price to performance ratio, one which reduces effectively the loss of fluid return pressure of a hydraulic manipulating valve.
  • a hydraulically-controlled lock apparatus for the travel of a hydraulic excavator.
  • the apparatus includes a first main pump, a second main pump, a main control valve, a first travel motor, a second travel motor, and a hydraulic fluid reservoir.
  • the hydraulic circuits of said first and said second main pumps to said main control valve are connected to the entrances of the hydraulically-controlled unloading valve, and the exit of said unloading valve is connected to said hydraulic fluid reservoir.
  • said hydraulically-controlled unloading valve is a logic hydraulically-controlled unloading valve.
  • said hydraulically-controlled unloading valve is a 2/2 way hydraulically-controlled unloading valve.
  • said hydraulically-controlled unloading valve is a pilot hydraulically-controlled unloading valve.
  • a hydraulically-controlled unloading valve when the travel mechanism is to be locked, a hydraulically-controlled unloading valve needs to be operated to unload the flow of the main pump to a hydraulic fluid reservoir, which enables a zero travel pressure, and thus a lock function.
  • said unloading valve needs to be operated to close the unloading path from the main pump to the hydraulic fluid reservoir to realize a normal travel.
  • One advantage of the present invention is that it provides a control apparatus having a simple structure and a reliable operation with fewer mounted components and a low malfunction rate.
  • the other advantage of the present invention is that it reduces the loss of fluid return pressure of the main pump when the travel of a hydraulic excavator is locked.
  • the hydraulically-controlled lock apparatus of the present invention is an apparatus with the features of simple structure, easy manipulation, reliable operation, and high price to performance ratio, which effectively reduces the loss of fluid return pressure of a hydraulic manipulating valve.
  • a first main pump 6 and a second main pump 5 are driven by an engine 7.
  • the main pumps 6 and 5 are connected respectively to a first travel motor 1 and a second travel motor 2 through a main control valve 8; the hydraulic circuits from the first and second main pumps 6 and 5 are also connected to entrance passages of a first logic unloading valve and a second logic unloading valve, 3, respectively.
  • the exit passages of the first and the second unloading valves 3 are connected to a hydraulic fluid supply tank or a hydraulic fluid reservoir 4.
  • said logic hydraulically-controlled unloading valve 3 when the hydraulic excavator is in motion, said logic hydraulically-controlled unloading valve 3 is turned off to close the unloading paths of said first and said second main pumps 6 and 5 to the hydraulic fluid reservoir 4, and thus the hydraulic fluid passes from said main pumps 6 and 5 to the main control valve 8 to the first and the second travel motors 1 and 2 to realize normal travel.
  • the logic hydraulically-controlled unloading valve 3 When the travel mechanism is to be locked, the logic hydraulically-controlled unloading valve 3 is turned on to unload the flow of the said first and second main pumps 6 and 5 through the logic hydraulically-controlled unloading valve 3 to the hydraulic fluid reservoir 4, which results in a zero hydraulic pressure to the said travel motors 1 and 2, and causing their stop, and thus a lock function.
  • unloading valve refers to a pressure control valve used to unload a pump and save energy when hydraulic fluid flow is not required. Unloading valves direct pump output flow directly to the hydraulic fluid reservoir at low pressure after system pressure has been reached. When the hydraulic system requires full fluid flow, fluid under pressure passes through the valve for discharge to the hydraulic system. When the system does not require full fluid flow, the excess fluid is automatically discharged from the unloading valve to the hydraulic fluid reservoir.
  • the unloading valve is a logic valve or a 2/2-way valve or a pilot valve.
  • Logic valves or 2/2-way valves also known as cartridge valves, have two functional ports.
  • a pilot pressure hydraulically controls the flow path between the two connections.
  • the logic valve has a poppet sleeve which remains in closed position with the help of a spring.
  • a well seated cone of the poppet valve provides nearly zero leakage state across two ports of the valve.
  • the control cover provides pilot connections, and it also encloses the cartridge valve.
  • a direct control can be provided to the cartridge valve by mounting different types of pilot controls to the adjacent manifold face or to the control cover.
  • the direct control of the cartridge valve's switching function can be achieved by using a pilot valve. This control is either between open or closed positions, two extreme positions or intermediate positions.
  • a first main pump 6 and a second main pump 5 are driven by an engine 7.
  • the main pumps 6 and 5 are connected respectively to a first travel motor 1 and a second travel motor 2 through a main control valve 8; the hydraulic circuits from the first and second main pumps 6 and 5 are also connected to entrance passages of a first 2/2-way unloading valve and a second 2/2-way unloading valve, 9, respectively.
  • the exit passages of the first and the second unloading valves 9 are connected to a hydraulic fluid reservoir 4.
  • a first main pump 6 and a second main pump 5 are driven by an engine 7.
  • the main pumps 6 and 5 are connected respectively to a first travel motor 1 and a second travel motor 2 through a main control valve 8; the hydraulic circuits from the first and second main pumps 6 and 5 are also connected to entrance passages of a first pilot unloading valve and a second pilot unloading valve, 10, respectively.
  • the exit passages of the first and the second unloading valves 10 are connected to a hydraulic fluid reservoir 4.
  • the 2/2-way hydraulic unloading valve 9 or the pilot hydraulically-controlled unloading valve 10, respectively, are operated to unload the flow of said first and second main pumps 6 and 5 to the hydraulic fluid reservoir, which enables a zero travel pressure and thus allows to realize a lock function.
  • said unloading valves 9 or 10 are operated to close the unloading paths from the first and second main pumps 6 and 5, and thus to realize normal travel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)
EP06118421A 2006-03-06 2006-08-03 Hydraulische Verriegelungsvorrichtung Withdrawn EP1832686A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN06250185 2006-03-06

Publications (1)

Publication Number Publication Date
EP1832686A1 true EP1832686A1 (de) 2007-09-12

Family

ID=36944108

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06118421A Withdrawn EP1832686A1 (de) 2006-03-06 2006-08-03 Hydraulische Verriegelungsvorrichtung

Country Status (1)

Country Link
EP (1) EP1832686A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2674626A1 (de) * 2012-06-12 2013-12-18 HAWE Hydraulik SE Hydraulikschaltung
CN113026858A (zh) * 2021-04-07 2021-06-25 雷沃工程机械集团有限公司 一种提高挖掘机整平性能的控制系统及控制方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02213529A (ja) * 1989-02-14 1990-08-24 Yutani Heavy Ind Ltd 建設機械の登はんモード回路
US5251440A (en) * 1990-11-13 1993-10-12 Samsung Heavy Industries Co., Ltd. Control apparatus and method for automatically controlling a hydraulic system for heavy construction equipment
EP0928849A2 (de) * 1998-01-08 1999-07-14 Hitachi Construction Machinery Co., Ltd. Pumpenstörungswarnsystem für hydraulische Baumaschinen
US6038859A (en) * 1998-05-13 2000-03-21 Poclain Hydraulics Industrie Hydraulic fluid circuit having a hydraulic motor and a three-position selector for selecting the circulation of fluid
JP2001165109A (ja) * 1999-12-03 2001-06-19 Kubota Corp 作業機の油圧システム
US20010036413A1 (en) * 2000-03-28 2001-11-01 Mcfadden Dan C. Speed regulated oil delivery system
US20030037465A1 (en) * 2001-08-22 2003-02-27 Kobelco Construction Machinery Co. Ltd., Hydraulic system for construction machine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02213529A (ja) * 1989-02-14 1990-08-24 Yutani Heavy Ind Ltd 建設機械の登はんモード回路
US5251440A (en) * 1990-11-13 1993-10-12 Samsung Heavy Industries Co., Ltd. Control apparatus and method for automatically controlling a hydraulic system for heavy construction equipment
EP0928849A2 (de) * 1998-01-08 1999-07-14 Hitachi Construction Machinery Co., Ltd. Pumpenstörungswarnsystem für hydraulische Baumaschinen
US6038859A (en) * 1998-05-13 2000-03-21 Poclain Hydraulics Industrie Hydraulic fluid circuit having a hydraulic motor and a three-position selector for selecting the circulation of fluid
JP2001165109A (ja) * 1999-12-03 2001-06-19 Kubota Corp 作業機の油圧システム
US20010036413A1 (en) * 2000-03-28 2001-11-01 Mcfadden Dan C. Speed regulated oil delivery system
US20030037465A1 (en) * 2001-08-22 2003-02-27 Kobelco Construction Machinery Co. Ltd., Hydraulic system for construction machine

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 014, no. 514 (M - 1046) 13 November 1990 (1990-11-13) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 23 10 February 2001 (2001-02-10) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2674626A1 (de) * 2012-06-12 2013-12-18 HAWE Hydraulik SE Hydraulikschaltung
CN113026858A (zh) * 2021-04-07 2021-06-25 雷沃工程机械集团有限公司 一种提高挖掘机整平性能的控制系统及控制方法
CN113026858B (zh) * 2021-04-07 2022-04-12 雷沃工程机械集团有限公司 一种提高挖掘机整平性能的控制系统及控制方法

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