EP2513491A1 - Ventilanordnung zur ansteuerung eines verbrauchers - Google Patents
Ventilanordnung zur ansteuerung eines verbrauchersInfo
- Publication number
- EP2513491A1 EP2513491A1 EP10784445A EP10784445A EP2513491A1 EP 2513491 A1 EP2513491 A1 EP 2513491A1 EP 10784445 A EP10784445 A EP 10784445A EP 10784445 A EP10784445 A EP 10784445A EP 2513491 A1 EP2513491 A1 EP 2513491A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- pressure
- consumer
- brake
- spool
- 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.)
- Granted
Links
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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
- F15B11/044—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out"
-
- 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
- F15B2211/41581—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a 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
- F15B2211/40—Flow control
- F15B2211/46—Control of flow in the return line, i.e. meter-out control
Definitions
- Valve arrangement for controlling a consumer
- the invention relates to a hydraulic valve arrangement for controlling a consumer with an acting as inlet throttle, continuously adjustable directional control valve, via which a pump connection with consumer connections is connected, the consumer is connected via working lines to the directional control valve and a drain volume flow of a pressure medium from the consumer via a throttle device in response to a load signal of the consumer is adjustable, wherein the throttle device is adjustable by a derived from the load signal back pressure.
- Valve arrangements are used in the mobile hydraulics of working machines, for example for controlling single or double-acting consumers or of slewing mechanisms, such as, for example, hydraulic motors and power lifters. In this case, in each case leading to the respective consumer working lines a throttle device is knotted, via which the incoming or outgoing hydraulic oil flow rate can be throttled.
- valve throttle For throttling the pressure medium inlet and the pressure medium outlet a valve throttle are arranged in the working lines, the valve members are mechanically coupled.
- the ratio of the inlet and outlet openings of the valve throttles is determined by the mechanical coupling of the opening edges of the common valve spool, so that a certain setting of the respective valve throttle a certain pressure loss in the drain line corresponds.
- This pressure loss is particularly undesirable when connecting single-acting consumers, as it does not represent a useful function.
- the pressure loss leads to energy losses, to an increase in the pressure medium temperature and possibly to premature wear of the valve throttle.
- Lowering brake valves prevent uncontrolled sagging and a lack of filling on the inlet side, thus preventing cavitation.
- the lowering brake valve In a working phase or lifting phase of a working cylinder, the lowering brake valve is bypassed by a check valve.
- the flow through the check valve causes high pressure losses.
- the known valve arrangement serves to supply pressure medium to a hydraulic consumer with a directional control valve, which has a pressure measuring medium volume flow predetermining inflow orifice and a directional part.
- the directional valve is associated with an individual pressure compensator.
- a lowering brake valve is provided, which is acted upon in the opening direction by a pilot pressure and the opening towards the consumer
- Check valve is connected in parallel, wherein the pilot pressure is tapped in a channel between the pressure compensator and the directional part.
- the channel is a bow channel between a pressure compensator outlet and in each case an intermediate chamber of a flow or return-side directional part of the directional control valve.
- the known valve arrangement is preferably a directional control valve element of a mobile control block.
- the invention has for its object to provide a valve arrangement for the control of a consumer whose drive signal of a brake valve is decoupled from cylinder pressures or pressures at another consumer, with a high reliability and an improved switching behavior to be ensured.
- a hydraulic valve assembly having the features of claim 1 in its entirety.
- the throttle device is controlled via a hydraulic circuit which detects the magnitude and direction of a pressure medium flow to the consumer.
- a device which detects the size and the direction of the pressure medium flow in the valve arrangement to the consumer. This makes it possible that the dynamic pressure signal for the brake slide, a signal of this device is superimposed for measuring the size and direction of the pressure medium flow.
- the pertinent device detects, for example, the switching position of the spool of the directional control valve. If the spool is switched back to a neutral position from a switching position which corresponds to a working position of the consumer, then the brake spool is moved into a switching position. Position brought by this device, which corresponds to a closed position.
- the device or the hydraulic circuit which detects the size and direction of the pressure medium flow to the consumer, acts by means of a pressure divider circuit in the process of the brake slide in a closed position such that a derived from the control pressure for the valve assembly, the reduced pressure controls the brake slide.
- the dynamic pressure signal for the brake slide is superimposed on a displacement of the spool in a switching position corresponding to the open position in terms of a working position of the consumer, by a signal of said device, in the sense that a disproportionately rapid opening position of the Brake slider is taken.
- the throttle device is set by a derived from a load signal or load-sensing signal back pressure, a constructive measure is taken to prevent Mitkoppelung of pressure increases in the consumer in the drive pressure or the drive signal for the brake valve.
- the dynamic pressure derived from a load-sensing signal is taken from a metering orifice of the directional spool or control piston of a directional control valve.
- a pressure compensator of such a directional control valve is able to generate the dynamic pressure correlated with the load signal.
- the throttle device can be designed as a metering diaphragm, in particular as a variable diaphragm.
- a dynamic pressure signal basically represents a physical quantity which is available only outside short-term pressure fluctuations or pressure increases in a hydraulic system; unlike the pressures themselves. It is a filtered signal per se.
- a standard directional control valve can be inexpensively extended to a directional control valve with load braking function.
- short control channels are possible and logical switching positions of the spool valve can be used to control the brake slide.
- throttle notches of the brake valve only allow a pressure medium drain when the directional control valve is moved from a neutral position.
- the throttle notches in the interior of the brake valve spool are in fluid-carrying connection with openings of the spool in its inner through hole. The brake slide or brake valve spool can thus be acted upon by dynamic pressure on its two end faces.
- the valve arrangement according to the invention reduces the pressure loss during operation of a hydraulic consumer in both flow directions of a pressure medium to the consumer. If the consumer presents itself as a single-acting hydraulic cylinder, the pressure loss during lifting is reduced by the fact that no check valve must be overflowed. In addition, the pressure loss decreases when lowering the hydraulic cylinder, since only the pressure in an inlet chamber of the hydraulic cylinder must be considered and a spring force of a return spring for the brake valve can be reduced to about 1/5 of the value according to the prior art.
- the hydraulic valve arrangement according to the invention will be explained in more detail with reference to various embodiments.
- FIG. 1 It shows a schematic representation of an embodiment of a valve assembly for controlling a consumer with a controlled by a back pressure of a LS-way valve brake slide; a schematic longitudinal section through a valve assembly according to the invention with an integrated in a spool of a directional control valve brake valve; a schematic circuit diagram of a valve arrangement according to the invention and a hydraulic circuit, which detects the size and direction of a pressure medium flow to a consumer; a partial schematic longitudinal section through a valve assembly with a hydraulic circuit, which detects the size and direction of a pressure medium flow to a consumer; an example of a An horrbertverlaufs on a brake valve of a valve assembly according to the invention, recorded on the control pressure on a spool e of a directional control valve; and
- FIG. 6 shows an example concerning the resolution accuracy of the hydraulic circuit for detecting the size and direction of the Pressure medium flow to / from the consumer with a pressure reversal at the control pressure to a spool.
- FIG. 1 shows a schematic circuit diagram of an exemplary embodiment of a valve arrangement 1 for actuating a hydraulic consumer 2.
- the consumer 2 is designed as a double-acting hydraulic cylinder, to whose operation a pressure medium flow is provided by a constant current pump 19.
- the constant-current pump 19 is driven by an internal combustion engine, not shown, of a working machine, such as a mini-excavator or wheel loader.
- the hydraulic cylinder serves, for example, to lift and lower a front work tool or an excavator arm or bucket or the like. It is understood that other fields of application of the valve arrangement 1 are possible, for example in an industrial truck or in known hydraulic hoists.
- the consumer 2 is controlled via a continuously adjustable directional control valve 3, of which only exemplary embodiments are shown in FIGS. 3 to 3.
- the directional control valve 3 is connected as a 4/3-way valve with two working lines 4, 5 to the consumer 2 in a fluid-conducting manner. Taking the load-sensing line into consideration, it is a 5/3-way valve.
- a brake valve 10 is knotted in the working line 5, which opens into a piston-side working space of the hydraulic cylinder.
- the brake valve 10 is mounted directly on the hydraulic cylinder to represent a pipe rupture function can.
- a check valve 21 secures the valve assembly 1 in case of any pipe break before loss of pressure medium.
- a load-sensing valve 35 is incorporated into a arranged between the constant-current pump 19 and the directional control valve 3 pressure medium line.
- a back pressure p 'of this load-sensing directional control valve 35 controls the function and thus the switching position of a brake slide 1 1 of the brake valve 10.
- FIG. 1 is a schematic longitudinal section of a valve assembly 1 from a directional control valve 3 with an integrated therein according to the invention with a controlled back pressure p 'controlled brake slide 1 1 shown in the brake valve 10.
- the valve arrangement 1 has a pump or pressure supply connection P on, a return connection R, two consumer connections A, B as well as two control connections ⁇ and P'B and a load signal or load-sensing connection LS.
- the basic function of such a valve arrangement 1 is disclosed in several prior applications of the applicant (for example in DE 10 2007 054 1 37.8 A1), so that will not be discussed in detail on this.
- the valve arrangement 1 has a control slide 12, which can be displaced horizontally in its housing as viewed in the direction of FIG. 2 and which is shown in its neutral position.
- the spool 12 in turn serves as a housing for the sliding therein also in the horizontal direction brake slide 1.
- the spool 12 has in addition Zumeßblenden 9 ( Figure 4) between the control terminals ⁇ and P'B and the respective load terminals A and B two openings 22 in an inner, longitudinal through hole 23. These openings 22 are in constant communication with throttle notches 24 of the inside lying brake slide 1 1.
- the throttle notches 24 can release the drain or a fluid-conducting connection 1 3 to the return port R only when the spool 1 2 is moved from the neutral position shown to a working position.
- each have a breakthrough 15,1 5 'provided at the ends 16 of the spool 12, at which end faces 18 of the brake slide 1 1 with the back pressure p' can be connected.
- FIG. 3 shows in a schematic circuit diagram of a valve assembly 1 according to the invention, the additional application of a hydraulic circuit 1 7, which superimposed the back pressure signal for the brake slide 1 1, a signal representing the size and direction of a pressure medium flow for the consumer 2.
- a hydraulic circuit 1 7 which superimposed the back pressure signal for the brake slide 1 1, a signal representing the size and direction of a pressure medium flow for the consumer 2.
- the hydraulic circuit 1 7 is the deflection of a non-biased by means of spring elements piston 27, the control pressure for the spool 1 2 to the brake slide 1 1 on.
- pressure divider circuit causes a comparatively reduced pressure the brake slide 1 1 drives.
- the throttle device 8 or the brake valve 10 are closed disproportionately. This contributes to the dynamics of, for example, the in The circuit of Figure 3 further discloses a pressure compensator 29 upstream of the fixed displacement pump 19, which can serve for Druckstoffmengenabschneidung to avoid overloading of the hydraulic motor 28 ,
- FIG. 4 shows an embodiment of a hydraulic circuit 1 7 for detecting the size and direction of the pressure medium flow for the respective consumer, which can be performed twice, approximately at each end face of the Steuerschie- bers 12 in the directional control valve housing.
- the hydraulic circuit 1 7 is shown in a longitudinal section in a longitudinal center plane of the directional control valve 3, so that not all fluid-carrying connections according to the circuit diagram 3 are shown.
- the switching elements shown are essentially:
- Brake detector surface 32 spring space of the spool 12
- the Fig.5 illustrates the control pressure for the brake slide 1 1, plotted against the control pressure of the spool 1 2.
- working position (a) of the spool 12 is given a direct-proportional ratio of said pressures, while in the braking position or throttle position of the Brake valve 1 1 a disproportionate connection of the pressures exists.
- FIG. 6 further illustrates the change of the control pressure for the brake slide 1 1 during braking (a) of a load and during acceleration (b) of a load or a consumer 2.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009058371A DE102009058371A1 (de) | 2009-12-15 | 2009-12-15 | Ventilanordnung zur Ansteuerung eines Verbrauchers |
PCT/EP2010/006814 WO2011072778A1 (de) | 2009-12-15 | 2010-11-09 | Ventilanordnung zur ansteuerung eines verbrauchers |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2513491A1 true EP2513491A1 (de) | 2012-10-24 |
EP2513491B1 EP2513491B1 (de) | 2014-05-28 |
Family
ID=43500104
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10784445.8A Not-in-force EP2513491B1 (de) | 2009-12-15 | 2010-11-09 | Ventilanordnung zur ansteuerung eines verbrauchers |
Country Status (5)
Country | Link |
---|---|
US (1) | US20120205563A1 (de) |
EP (1) | EP2513491B1 (de) |
JP (1) | JP2013513770A (de) |
DE (1) | DE102009058371A1 (de) |
WO (1) | WO2011072778A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010014071B4 (de) | 2010-04-07 | 2012-12-06 | Hydac Filtertechnik Gmbh | Hydraulische Anlage |
CN113107929B (zh) * | 2021-04-15 | 2023-06-30 | 中国铁建重工集团股份有限公司 | 负载敏感液压回路 |
DE102022124970A1 (de) * | 2022-09-28 | 2024-03-28 | Deere & Company | Anordnung zur Steuerung eines hydraulischen Dreipunkt- Krafthebers |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4067357A (en) * | 1974-06-14 | 1978-01-10 | Herion-Werke Kg | Pilot-operated directional control valve |
DE3104957C2 (de) * | 1981-02-12 | 1986-12-04 | Herion-Werke Kg, 7012 Fellbach | Hydraulisch betätigbares Pressensicherheitsventil |
US4738279A (en) * | 1985-12-17 | 1988-04-19 | Linde Aktiengesellschaft | Multiway valves with load feedback |
ES2004356A6 (es) * | 1986-12-26 | 1989-01-01 | Hiac Valman S A | Distribuidor para cilindros hidraulicos |
DE3802672C2 (de) * | 1988-01-29 | 1993-12-16 | Danfoss As | Hydraulisches Steuerventil mit Druckfühleinrichtung |
DE3817123A1 (de) * | 1988-05-19 | 1989-11-30 | Herion Werke Kg | Sicherheitsventil |
DE4021347A1 (de) * | 1990-07-05 | 1992-01-16 | Heilmeier & Weinlein | Hydraulische steuervorrichtung |
US5701933A (en) * | 1996-06-27 | 1997-12-30 | Caterpillar Inc. | Hydraulic control system having a bypass valve |
DE19735482B4 (de) * | 1997-08-16 | 2006-08-10 | Bosch Rexroth Aktiengesellschaft | Hydraulisches System mit einem Differentialzylinder und einem Eilgangventil |
DE102005013823A1 (de) | 2004-03-25 | 2005-11-10 | Husco International Inc., Waukesha | Verfahren zum Steuern eines Hydrauliksystems unter Verwendung eines differenzdruckkompensierten Durchflusskoeffizienten |
EP1619105B1 (de) * | 2004-07-22 | 2007-09-05 | Eaton S.r.l. | Verbrauchsmengesteuerventil für ein hydraulisches System mit Lastmeldung |
DE102007020558A1 (de) * | 2007-05-02 | 2008-11-06 | Robert Bosch Gmbh | Ventilanordnung |
DE102007054137A1 (de) | 2007-11-14 | 2009-05-28 | Hydac Filtertechnik Gmbh | Hydraulische Ventilvorrichtung |
-
2009
- 2009-12-15 DE DE102009058371A patent/DE102009058371A1/de not_active Withdrawn
-
2010
- 2010-11-09 EP EP10784445.8A patent/EP2513491B1/de not_active Not-in-force
- 2010-11-09 US US13/261,265 patent/US20120205563A1/en not_active Abandoned
- 2010-11-09 JP JP2012543492A patent/JP2013513770A/ja active Pending
- 2010-11-09 WO PCT/EP2010/006814 patent/WO2011072778A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2011072778A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2013513770A (ja) | 2013-04-22 |
WO2011072778A8 (de) | 2011-09-09 |
EP2513491B1 (de) | 2014-05-28 |
WO2011072778A1 (de) | 2011-06-23 |
DE102009058371A1 (de) | 2011-06-16 |
US20120205563A1 (en) | 2012-08-16 |
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