EP2600011A2 - Distributeur hydraulique pour le dispositif de levage d'un véhicule agricole - Google Patents

Distributeur hydraulique pour le dispositif de levage d'un véhicule agricole Download PDF

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Publication number
EP2600011A2
EP2600011A2 EP20120191963 EP12191963A EP2600011A2 EP 2600011 A2 EP2600011 A2 EP 2600011A2 EP 20120191963 EP20120191963 EP 20120191963 EP 12191963 A EP12191963 A EP 12191963A EP 2600011 A2 EP2600011 A2 EP 2600011A2
Authority
EP
European Patent Office
Prior art keywords
port
connection
pump
switching position
hydraulic
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Withdrawn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
EP20120191963
Other languages
German (de)
English (en)
Other versions
EP2600011A3 (fr
Inventor
Reiner Kunz
Simon Ehmann
Joerg Mueller
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2600011A2 publication Critical patent/EP2600011A2/fr
Publication of EP2600011A3 publication Critical patent/EP2600011A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/85978—With pump

Definitions

  • the invention relates to a hydraulic directional control valve according to the preamble of claim 1.
  • the hoist comprises two hydraulic cylinders 12; 14 for lifting and lowering the hoist. These are connected to the first and the second working port of a hydraulic directional control valve 24.
  • the directional control valve also has a pump port connected to a hydraulic pump which can deliver hydraulic fluid from a reservoir tank 18 to the hydraulic cylinders.
  • the directional control valve has a tank connection, which is connected to the storage tank.
  • the hydraulic directional valve is designed as a proportional valve and has four switching positions. In the first switching position, the pump connection, the tank connection and the first and the second working connection are blocked, so that the position of the hoist can not be changed.
  • a fourth switching position is provided, which is designed as a free position, i. the first and second working ports are connected to the tank port with the pump port blocked.
  • the hoist can be freely raised and lowered by externally applied forces.
  • This switching position is used when a working device is mounted on the hoist, which is supported while driving the agricultural vehicle on the ground, it should follow this.
  • the implement may be, for example, a mower.
  • a separate switching valve 42 is provided, with which a further switching state is realized, in which the first working port is connected to the storage tank.
  • This switching valve is blocked in the already explained switching positions of the directional control valve.
  • it is open, wherein the directional control valve is in the second switching position.
  • the hydraulic pump thus promotes no load in the tank, so that no pressure builds up on the hydraulic cylinder.
  • the hoist can only be lowered by the weight of the connected implement.
  • This switching state is used, for example, to lower the hoist before it is brought into the already mentioned open position.
  • the object of the invention is to provide a hydraulic directional control valve in which the separate switching valve can be dispensed with in order to realize said further switching state.
  • this object is achieved in that a fifth switching position is provided, in which the tank connection is connected to the second working port, wherein the pump port and the first working port are locked.
  • the directional valve is equipped with a further, fifth switching position. In this fifth switching position, the pump connection is blocked. In contrast to the solution explained above, the pump delivery flow does not reach the storage tank via the directional control valve derived. The first work connection is also blocked. Through this embodiment of the directional control valve can be dispensed with an additional switching valve.
  • An LS port may be provided on the hydraulic directional control valve connectable to the pressure regulator of the hydraulic pump, the LS port being connected to the pump port in the second and third shift positions, being in the first, fourth and fifth Switching position is connected to the tank connection.
  • Hydraulic hoist controls that operate on the load-sensing principle are known from the prior art. In this case, the load pressure acting on the hydraulic cylinder is fed back to the pressure regulator of the pump in order to regulate the pump pressure. As a result, an energy-saving operation of the hydraulic pump is made possible. With the proposed solution, the application of the load-sensing principle is also possible in fifth Druckzugstand invention.
  • the directional control valve can be designed as a proportional valve in which all fluid connections open and close continuously. This allows the hoist to be moved sensitively, i. as desired by the operator, slow and fast movement speeds can be adjusted with fine gradation.
  • the valve spool can pass through a first transition region between the second and the fourth switching position, in which the pump port is connected to the first working port, the fluid connection being blocked from the first working port to the tank port.
  • the transition between the second and the fourth switching position requires several changes in the connection of the connections of the directional control valve. Due to the introduction of the proposed transition region, which is always only briefly traversed during operation and essentially not used for the motion control, these interconnection changes can be realized particularly easily.
  • the valve spool can pass through a second transition region between the first transition region and the fourth switching position, in which the fluid connection from the tank connection to the first working port opens continuously.
  • Fig. 1 shows a circuit arrangement with a hydraulic directional control valve 10 according to the invention according to a first embodiment of the invention.
  • the hydraulic cylinder 30 is part of a (not shown) hoist of an agricultural vehicle. By pressurizing the piston bottom side cylinder chamber 31 ago the hoist is lowered.
  • the piston bottom side cylinder chamber 31 is connected to the first working port A of the directional control valve 10.
  • the annular surface side cylinder chamber 32 is connected to the second working port B of the directional control valve 10.
  • the hydraulic cylinder 30 is driven by a hydraulic pump 40 which sucks hydraulic fluid from a storage tank 43 and delivers it under pressure to the hydraulic cylinder 30.
  • the hydraulic pump 40 is connected to the pump port P of the directional control valve 10.
  • the corresponding pump line 41 is connected to a pressure limiting valve 42 which limits the pump pressure upwards, in particular when the pump connection P of the directional control valve 10 is blocked.
  • the corresponding flow is discharged into the storage tank 43.
  • the tank connection T of the directional control valve 10 is likewise connected to the storage tank 43.
  • the directional control valve 10 is held in the first switching position 11 via the two return springs 20 acting in the opposite direction.
  • the pump connection P, the tank connection T and the first and the second working connection A are; B locked.
  • the hoist is thus immovably held in its current position, wherein the hydraulic pump 40 promotes via the pressure relief valve 42 in the storage tank 43.
  • a hydraulic pump with adjustable displacement volume can be provided.
  • the valve spool is moved to the right with the first electromagnetic actuator 21, so that the pump port P is connected to the second working port B and the first working port A is connected to the tank port T. As a result, the hoist is raised.
  • valve spool With the second electromagnetic actuator 22, the valve spool is moved to the left, wherein he successively in the fifth 15, the second 12 and the fourth switching position 14 passes.
  • the pump port P and the first working port A are blocked, the second working port B being connected to the tank port T.
  • the hydraulic fluid in the annular surface-side cylinder chamber 32 is pressurized by the weight of the working device attached to the lifting device, wherein it can flow into the storage tank 43 in a controlled manner via the opening cross-sectional area set in the directional control valve 10. The hoist is thus lowered solely by its own weight.
  • valve slide If the valve slide is now moved further into the second switching position 12, then the pump port P is connected to the first working port A, so that the lifting gear can be pressed down with the implement in addition to its own weight with hydraulic force.
  • Fig. 2 shows a circuit arrangement with a hydraulic directional control valve 10 according to the invention according to a second embodiment of the invention.
  • an LS port LS is provided on the directional control valve 10, which with a pressure regulator 44, a hydraulic adjustment device 45 and a hydraulic pump 40 is connected to an adjustable displacement volume.
  • the pump port P of the directional control valve is connected to the LS port LS.
  • the displacement volume of the hydraulic pump 40 is thus adjusted according to the volume flow required at the hydraulic cylinder 30, so that no excess fluid flow has to be discharged into the storage tank 43.
  • the LS port LS is connected to the tank port T, so that the displacement volume of the hydraulic pump 40 is adjusted substantially to zero.
  • the hydraulic pump 40 thus promotes substantially no hydraulic fluid and accordingly requires very little drive power.
  • the second embodiment of the invention corresponds to the first embodiment, so that in this regard to the comments on Fig. 1 can be referenced.
  • Fig. 3 shows a diagram in which the opening cross-sectional area Q of the various connection paths of the directional control valve is plotted over the movement path s of the valve spool. Not shown are the fluid connections to the LS connection according to the second embodiment of the invention, since only very small volume flows flow, so that the design of the corresponding switching transitions is less critical.
  • the first shift position 11 is arranged in the region of the coordinate origin. In the first switching position 11 all fluid connections are substantially completely closed. There are possibly due to unavoidable leakage volume flows.
  • the fluid connection A-T from the first workport to the tank port opens slightly earlier than the fluid connection P-B from the pump port to the second workport.
  • the opening cross-sectional area of the fluid connection A-T is always greater than the opening cross-sectional area of the fluid connection P-B, so that the hydraulic fluid flowing back into the storage tank is exposed to a small back pressure.
  • the graphs of the two connections P-B and A-T show a fine control range 51 with a smaller pitch, which serves for the sensitive movement of the lifting mechanism. The remaining area with a larger pitch was introduced in order to be able to set large volume flows even by small changes in the gate travel s. As a result, the Monschieberweg and thus the size of the directional control valve can be kept small.
  • the fluid connection B-T opens from the second workport to the tank port. This point marks the beginning of the fifth shift position 15. Again, a fine control range 52 is provided with a low slope. When the end of the fine control region 52 of the fluid connection B-T is reached, the fluid connection P-A also opens from the pump port to the first working port. This point marks the beginning of the second switching position 12.
  • the fluid connection BT reaches its maximum opening cross-sectional area, which remains constantly open up to the mentioned end position. Shortly after the fluid connection BT has reached its maximum opening cross-sectional area, the fluid connection PA also reaches its maximum opening cross-sectional area 50, which drops back to zero during the further movement of the valve slide. there the maximum opening cross-sectional area 50 of the fluid connection PA is smaller than the maximum opening cross-sectional area of the fluid connection BT, so that here too the hydraulic fluid flowing back to the storage tank is exposed to a low back pressure.
  • the maximum 50 of the opening cross-sectional area of the fluid connection P-A marks the end of the second switching position 12.
  • the second switching position 12 terminates slightly earlier.
  • the first transition region 16 starting here extends to the point at which the fluid connection P-A is completely closed.
  • the maximum opening cross-sectional areas of the fluid connections A-T and B-T are the same size.
  • the fourth shift position 14 begins, in which the opening cross-sectional areas of the fluid connections A-T and B-T remain constant.
  • first and second transition regions 16; 17 are only briefly traversed during operation of the directional control valve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Lifting Devices For Agricultural Implements (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
  • Multiple-Way Valves (AREA)
EP12191963.3A 2011-12-03 2012-11-09 Distributeur hydraulique pour le dispositif de levage d'un véhicule agricole Withdrawn EP2600011A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201110120302 DE102011120302A1 (de) 2011-12-03 2011-12-03 Hydraulisches Wegeventil für das Hubwerk eines landwirtschaftlichen Fahrzeugs

Publications (2)

Publication Number Publication Date
EP2600011A2 true EP2600011A2 (fr) 2013-06-05
EP2600011A3 EP2600011A3 (fr) 2017-03-08

Family

ID=47227517

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12191963.3A Withdrawn EP2600011A3 (fr) 2011-12-03 2012-11-09 Distributeur hydraulique pour le dispositif de levage d'un véhicule agricole

Country Status (4)

Country Link
US (1) US9255587B2 (fr)
EP (1) EP2600011A3 (fr)
CN (1) CN103133445B (fr)
DE (1) DE102011120302A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013224322A1 (de) 2013-11-28 2015-05-28 Robert Bosch Gmbh Hydraulische Steueranordnung
CN103999589B (zh) * 2014-05-07 2016-08-24 武汉盛硕电子有限公司 用于农耕机的农具提升系统
CN111802010B (zh) * 2020-07-22 2022-08-12 河南科技大学 一种液压泵后置式拖拉机电液悬挂系统

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6971453B2 (en) 2003-11-11 2005-12-06 Deere & Company Control system for a three point implement hitch assembly

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2905332A1 (de) * 1979-02-13 1980-08-21 Kloeckner Humboldt Deutz Ag Hydraulisches 4/4- bzw. 4/5-wegeventil
US4565219A (en) * 1982-09-13 1986-01-21 The Oilgear Japan Company Multiple-position solenoid-operated control valve
DE3836453A1 (de) * 1987-12-21 1989-07-06 Bosch Gmbh Robert Ventilanordnung zur steuerung und ueberwachung des arbeitsdruckes eines hydraulischen verbrauchers
IE64569B1 (en) * 1989-11-07 1995-08-23 Ror Rockwell Ltd Height control of air suspended vehicles
KR930010906B1 (ko) * 1989-12-14 1993-11-17 니뽄 에어브레이크 가부시끼가이샤 유압 모터의 제어 회로
DE4036564A1 (de) * 1990-11-16 1992-05-21 Bosch Gmbh Robert Hydraulische einrichtung zur steuerung eines arbeitszylinders einer presse
DE19608758A1 (de) * 1996-03-07 1997-09-11 Rexroth Mannesmann Gmbh Hydraulische Ventilanordnung
DE19957952A1 (de) * 1999-12-02 2001-06-07 Mannesmann Rexroth Ag Hydraulisches Wegeventil zur lastunabhängigen Steuerung eines hydraulischen Verbrauchers von insbesondere einer mobilen Arbeitsmaschine
DE10121924A1 (de) * 2001-05-05 2002-11-07 Bosch Rexroth Ag Hydraulische Steueranordnung zur Steuerung eines einfachwirkenden hydraulischen Verbrauchers hinsichtlich Richtung und Geschwindigkeit und Wegeventil dafür
FI20115108A7 (fi) * 2011-02-03 2012-08-04 Parker Hannifin Mfg Finland Oy Painesäädöllä varustettu suuntaventtiili

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6971453B2 (en) 2003-11-11 2005-12-06 Deere & Company Control system for a three point implement hitch assembly

Also Published As

Publication number Publication date
EP2600011A3 (fr) 2017-03-08
DE102011120302A1 (de) 2013-06-06
CN103133445A (zh) 2013-06-05
CN103133445B (zh) 2017-03-01
US20130139915A1 (en) 2013-06-06
US9255587B2 (en) 2016-02-09

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