WO2013087156A2 - Soupape de limitation de pression et circuit hydraulique fermé comprenant une soupape de limitation de pression - Google Patents

Soupape de limitation de pression et circuit hydraulique fermé comprenant une soupape de limitation de pression Download PDF

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Publication number
WO2013087156A2
WO2013087156A2 PCT/EP2012/004996 EP2012004996W WO2013087156A2 WO 2013087156 A2 WO2013087156 A2 WO 2013087156A2 EP 2012004996 W EP2012004996 W EP 2012004996W WO 2013087156 A2 WO2013087156 A2 WO 2013087156A2
Authority
WO
WIPO (PCT)
Prior art keywords
valve
pressure
control
pressure limiting
line
Prior art date
Application number
PCT/EP2012/004996
Other languages
German (de)
English (en)
Other versions
WO2013087156A3 (fr
Inventor
Hakan Camurdan
Robert Wanner
Jürgen GINTER
Dirk Van Aalst
Markus GEPRÄGS
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 WO2013087156A2 publication Critical patent/WO2013087156A2/fr
Publication of WO2013087156A3 publication Critical patent/WO2013087156A3/fr

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
    • 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
    • F15B13/024—Pressure relief 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
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief 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
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/528—Pressure control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief valve
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/575—Pilot pressure control
    • F15B2211/5756—Pilot pressure control for opening a valve

Definitions

  • the invention relates to a pressure relief valve according to the preamble of
  • Patent claim 1 and a closed hydraulic circuit with such a pressure relief valve.
  • Pressure relief valves are connected to hydraulic systems to limit their system pressure.
  • the system pressure acts via a control line in the opening direction on a valve body, while against a spring acts on the valve body in the closing direction with a force.
  • the valve body is moved to an open position, and the system relieved via the pressure relief valve.
  • the document DE 196 40 545 A1 and the document DE 10 2004 057 740 B4 each show a pressure relief valve which serves to limit the pressure of a feed line.
  • About the feed line pressure medium in a low pressure leading working line of a closed hydraulic circuit is promoted by a feed pump, which serves as a substitute pressure means for a shortage of the circle.
  • a control pressure is additionally tapped from the supply line via a control line, which is used to adjust a
  • Variable displacement pump of the closed circuit is used. Furthermore, one is
  • Pressure cutting device which limits the pressure in the control line.
  • the pressure cut device relieves the control line to a tank when the pressure of the high pressure working line exceeds the pressure equivalent of the spring force. Since this reduction of the control pressure leads to a pivoting back of the variable displacement pump, which promotes the working line leading to high pressure, the pressure in the high-pressure leading working line is indirectly limited via the pressure cutting device.
  • a disadvantage of said pressure relief valves that their set pressure is always defined by the spring and therefore is not changeable.
  • pressure limiting valves are known from the prior art whose spring force is variable, whereby the response pressure of the pressure limiting valve can be adjusted in a predetermined interval.
  • the object of the invention is to provide a pressure limiting valve in which the possibilities of changing the response pressure is widened and improved.
  • a feed pressure reduction device is shown, via which the feed line can be connected to the suction side of the constant feed pump in order to reduce the pressure build-up in the feed line.
  • This feed pressure lowering device is transitionally, e.g. activated when starting an internal combustion engine, which also drives the feed pump in addition to the variable. This serves to relieve the
  • the closed hydraulic circuit according to the invention with feed pump and feed pressure line is the object of the pressure protection and the
  • the pressure limiting valve arrangement has a pressure limiting valve-preferably a low-pressure limiting valve-which has a valve body whose first control surface-for example via a first control line or via a first control line Control connection - is acted upon in the opening direction with a system pressure to be limited. With a spring, the valve body is acted upon in the closing direction.
  • valve body has a second control surface, which can be actuated via a second control line or a second control connection with system pressure.
  • the set pressure of the pressure limiting valve arrangement according to the invention or of its pressure limiting valve can be changed over between two different values which are clearly spaced apart from one another.
  • the system pressure may be reduced at the second control surface. If this pressure reduction is optional, a third set pressure can be set. If this pressure reduction is variable, the response pressure can be selected within an interval spaced from the first response pressure.
  • the second control surface acts against the spring in the opening direction of the valve body. This can be reduced by pressurization of the second control surface of the response pressure of the pressure relief valve assembly according to the invention or its pressure relief valve over the prior art.
  • the second control surface acts together with the spring in the closing direction of the valve body. This can be increased by pressurizing the second control surface of the set pressure.
  • a switching valve designed as a 2/2-way valve is arranged in the second control line, or the second control connection is preceded by such a switching valve. Over a nozzle could then be relieved the second control surface.
  • the second control line is shut off in a biased by a spring basic position (normally closed), and in a by an electric magnet activated switching position open. This is set in the de-energized state of the switching valve in the first basic variant, an increased response pressure and the second basic variant, a reduced set pressure of the pressure relief valve assembly according to the invention.
  • the second control line may alternatively be arranged as a 3/2-way valve switching valve, or the second control terminal is such
  • the second control surface is relieved in the one switching position of the switching valve via the valve to a tank and acted upon in the other switching position with the pressure at the inlet of the pressure relief valve.
  • the one switching position can be activated by an electromagnet switching position or the biased by a spring basic position. This is in the de-energized state of the switching valve in a first basic variant, a reduced set pressure and the second principal variant, an elevated set pressure of the invention
  • a pressure reducing valve designed as a proportionally adjustable 3/2 way valve is arranged in the second control line, or the second control connection is preceded by a pressure reducing valve designed as a 3/2 directional control valve.
  • the second control pressure which - based on the system pressure - applied to the second control terminal, can be variably reduced.
  • the response pressure can be selected within an interval spaced apart from the first response pressure.
  • a valve body of the pressure reducing valve in a biased by a spring basic position relieves the second control surface to a tank, and if the valve body of the pressure reducing valve is movable by an adjustable electromagnet in switching positions, whereby the second control line controlled against the force of the spring becomes. This results in a control engineering stabilization of the pressure reducing valve when connected to the second control line between the pressure reducing valve and the
  • Pressure control valve is connected to a further control line, via which the valve body of the pressure reducing valve is acted upon in the direction of its basic position.
  • valve body of the pressure relief valve is guided displaceably in a valve sleeve, wherein a radially expanded conical portion of the valve body of the pressure limiting valve is biased by the spring against a valve seat forming a circumferential edge of the valve sleeve.
  • first control surface is arranged on an inner region of the conical section and bounded by the valve seat on its outer periphery.
  • the pressure limiting valve arrangement or the pressure limiting valve according to the invention is a screw-in valve.
  • the valve bush has a screw thread on its outer circumference.
  • a housing of the pressure reducing valve On the outer circumference of the valve sleeve adjacent to the screw thread, a housing of the pressure reducing valve may be attached. Then, three radial holes or three hole stars are arranged in the contact area of the housing of the pressure reducing valve in the valve sleeve. These form, firstly, a connection of the pressure reducing valve with a arranged in a longitudinal bore of the valve sleeve second control chamber and secondly, a connection of the pressure reducing valve with the system pressure to be limited and third, a connection of the pressure reducing valve with a tank relieved spring chamber of the pressure relief valve.
  • the closed hydraulic circuit according to the invention has two working lines into which replacement pressure means for a shortage can be conveyed from a feed pump-preferably from an internal gear pump-via a feed line.
  • the feed line can be relieved via a pressure relief valve arrangement described above.
  • this pressure relief valve arrangement can be used for increased response pressure and in idle or in load-reduced operation to be set to reduced set pressure.
  • an adjustment unit of a variable displacement pump is connected to the supply line via an adjustment pressure line.
  • the necessary for adjusting the variable adjustment pressure is generated by the feed pump.
  • this is in a vehicle - e.g. Concrete mixer - or provided in a mobile work machine.
  • the vehicle or the work machine has an internal combustion engine, to which the variable displacement pump of the circuit is coupled.
  • a Versteilmotor the circle is connected to a temporary or transitional operated auxiliary unit -. coupled to a mixing drum - the vehicle or the work machine.
  • the hydraulic circuit energy can be saved by the fact that the pressure limiting valve arrangement is set to the reduced set pressure in load-free or low-load mit Deutschendem additional unit.
  • FIG. 1 shows a circuit diagram of a first embodiment of the pressure limiting valve arrangement according to the invention.
  • FIG. 2 shows a circuit diagram of a second exemplary embodiment of the pressure limiting valve arrangement according to the invention
  • FIG. 3 shows a circuit diagram of a third exemplary embodiment of the pressure limiting valve arrangement according to the invention
  • FIG. 4 shows a circuit diagram of a fourth exemplary embodiment of the pressure limiting valve arrangement according to the invention
  • Figure 5 shows the first embodiment of the Druckbegrenzungsven- tilan extract invention in a sectional perspective view
  • FIG. 6 shows a part of an embodiment of a closed hydraulic circuit according to the invention with the first embodiment of the Druckbegrenzungsven- tilanix according to Figure 1 or 5.
  • FIG. 1 shows a circuit diagram of a first exemplary embodiment of the pressure limiting valve arrangement 1 according to the invention. It is connected to a hydraulic system whose system pressure is to be monitored or limited. Of the hydraulic system, only one line 4 is partially shown. This opens into a pressure relief valve 3, the valve body 2 is biased by a spring 6 (in Figure 1) to the left in the closing direction. In the manner known from the prior art, the system pressure prevailing in the line 4 counteracts in the opening direction. For this purpose, the system pressure prevailing at the inlet of the pressure limiting valve 3 acts via a first control line 12 and via a first control chamber 8 on a first control surface 10 of the valve body 2.
  • a second control line with the sections 14a and 14b which connects the system pressure leading line 4 with a second control chamber 16.
  • the second control chamber 16 is bounded by a second control surface 18, which is arranged on the valve body 2 and acts on this in the closing direction with a second control pressure.
  • 14b designed as a 3/2-way valve pressure reducing valve 20 is arranged in the second control line 14a. It has a valve body 22 which is biased by a spring 24 in the closing direction. Furthermore, the valve body 22 is acted upon via a further control line 25 from the outlet pressure of the pressure reducing valve 20 and thus from the second control pressure of the pressure limiting valve 3 in the closing direction.
  • the system pressure prevailing in the line 4 and in the first section of the second control line 14a can be reduced so as to produce a variable further in the opening direction of the pressure limiting valve. valve 3 to generate effective control force.
  • the response pressure of the first embodiment of the pressure relief valve arrangement 1 according to the invention can be reduced steplessly as a function of energization of the electromagnet 26.
  • FIG. 2 shows a circuit diagram of a second exemplary embodiment of the pressure-limiting valve arrangement 101 according to the invention. This is simpler in terms of device technology compared with the first exemplary embodiment according to FIG. 1 and is reduced in scope of functions.
  • a 3/2-way switching valve 120 is provided in the second control line 14a, 14b.
  • the other technical characteristics correspond to the first one
  • the directional control valve 20 switches into an open position, whereby the voltage applied in the line 4 system pressure via the second control line 14a, 14b also abuts against the second control surface 18 and thus supports an opening movement of the valve body 2 of the pressure limiting valve 3.
  • the first and the second embodiment of the Druckbegren- tion valve arrangement 1 according to the invention; 101 are constructed according to the first basic variant of the pressure limiting valve arrangement according to the invention, in which the second control pressure via the second control surface 18 facilitates an opening movement of the pressure limiting valve 3.
  • this first basic variant applies in the de-energized state of the valve 20; 120: FFeder - Pi * A-
  • a 2 size of the second control surface 18
  • both control surfaces 10, 18 are the same size, and if in the first embodiment, the second control pressure is not reduced by the pressure reducing valve 20 or when the second embodiment, the switching valve 120 is opened, results in halving the response pressure of the pressure relief valve assembly 1, 101st
  • Figure 3 shows a third embodiment and Figure 4 shows a fourth embodiment of the pressure relief valve assembly 201 according to the invention; 301, wherein the second control pressure according to the second basic variant via the second control pressure line 14a, 14b acts on a valve body 202 of the pressure relief valve 203 in the closing direction.
  • the second control pressure acts in the second control chamber 216 together with a spring 206 against the pressure of the first control chamber 208.
  • the prevailing in the line 4 to be limited system pressure on the first control line 12th guided to the first control surface 210 and acts there in the opening direction.
  • a 3/2-way switching valve 220 is provided in the second control line 14a, 14b and pressurizes the second control surface 218 with system pressure in a basic position (shown in FIG. 3) and biased by a spring 124. In a switched by an electromagnet 126 switching position, the second control surface 218 is relieved via a tank line T to the tank.
  • the pressure reducing valve 20 described with reference to FIG. 1 is arranged in the second control line 14a, 14b.
  • the second control pressure acting in the closing direction can be reduced steplessly.
  • FIG. 5 shows the first exemplary embodiment of the pressure limiting valve arrangement 1 according to the invention in a sectional perspective view.
  • the Pressure relief valve 3 has a valve sleeve 28 which is screwed via an external screw thread 30 in a housing 32 of a hydraulic device not shown in detail.
  • the hydraulic device may be a connection plate or a pump.
  • the valve body 2 In the valve sleeve 28, the valve body 2 is guided displaceably. He has at his (in Figure 5) right end portion a
  • Main section is expanded.
  • the cone portion 34 forms with a peripheral edge of the valve sleeve 28 a valve seat 36 and is biased via a valve disc 38 of the spring 6 (in Figure 5 to the left) in the closing direction.
  • the line 4 and the cone portion 34 are connected to each other via the first control line 12 and the first control chamber 8.
  • the first control line 12 extends radially in the valve sleeve 28, while the first control chamber 8 is formed by a pressure chamber which includes the valve body 2 in sections.
  • the (in Figure 5) left end face of the valve body 2 serves as a second control surface 18, which is acted upon via a radial bore 14b and the second control chamber 16 with the second control pressure.
  • the second control pressure can be regulated by the pressure reducing valve 20.
  • a housing 40 of the pressure reducing valve 20 comprises a protruding from the housing 32 end portion of the valve sleeve 28 and connects in this way the pressure reducing valve 20 via the radial bore 14b with the second control chamber 16.
  • the pressure reducing valve 20 via radial bores and longitudinal bores 14a with the line 4 in connection.
  • the pressure reducing valve 20 in conjunction with a spring chamber 42 of the pressure relief valve.
  • the spring chamber 42 is relieved via a further tank channel T to the tank.
  • Figure 6 shows a part of an embodiment of a closed hydraulic circuit according to the invention.
  • the circle is provided on a concrete mixer vehicle and serves for the temporary drive of a mixing drum (not shown).
  • the circle has a variable displacement pump 44, from the two working lines 46, 48th a (not shown) Versteilmotor is driven.
  • the Versteilmotor serves to drive the mixing drum.
  • variable displacement pump 44 is driven by an internal combustion engine (not shown), wherein a feed pump 50 designed as a fixed displacement pump is also driven by a rigid mechanical coupling. This promotes from a tank via a feed line 52 and one of two check valves 54 replacement pressure medium in the respective low pressure leading working line 46, 48th
  • Proportional valve 58 is connected to a double-acting adjusting 60 of the variable displacement pump 44.
  • the feed line 52 can be relieved via the pressure relief valve assembly 1 according to Figures 1 and 5 at different response pressures.
  • the mixing drum is driven under load, wherein the feed pump 50 and the feed line 52 are secured at the elevated pressure level. This is achieved by the basic position of the pressure reducing valve 20 (cf., explanations to FIG. 1), the second control surface 18 being relieved of pressure.
  • the pressure reducing valve 20 is energized, whereby the set pressure of the pressure relief valve 3 is significantly reduced.
  • the pressure of the feed line 52 and the load of the feed pump 50 is reduced, resulting in a discharge of the (not shown) internal combustion engine.
  • a pressure limiting valve arrangement with a pressure limiting valve - preferably low pressure limiting valve - which has a valve body, the first control surface - for example, via a first control line or via a first control terminal - is acted upon in the opening direction with a system pressure to be limited.
  • the pressure relief valve has a spring, via which the valve body is acted upon in the closing direction.
  • the valve body has a second control surface, which can be pressurized via a second control line or a second control connection with system pressure. The system pressure may also be reduced or throttled at the second control surface.
  • the supply line can be relieved via a pressure relief valve arrangement described above with different response pressures.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Safety Valves (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control Of Transmission Device (AREA)

Abstract

L'invention concerne un ensemble à soupape de limitation de pression comprenant une soupape de limitation de pression, de préférence une soupape de limitation basse pression, pourvue d'un corps de soupape dont la première surface de commande est soumise à l'action d'une pression du système devant être limitée, cette pression s'exerçant dans le sens d'ouverture p. ex. par l'intermédiaire d'une première conduite de commande ou d'un premier raccord de commande. La soupape de limitation de pression comprend en outre un ressort qui agit sur le corps de soupape dans le sens de fermeture. Selon l'invention, le corps de soupape comporte une deuxième surface de commande qui peut être soumise à l'action de la pression du système par l'intermédiaire d'une deuxième conduite de commande ou d'un deuxième raccord de commande. La pression du système peut aussi s'exercer sur la deuxième surface de commande de manière réduite ou étranglée. L'invention concerne en outre un circuit hydraulique fermé comprenant deux conduites de travail dans lesquelles du fluide hydraulique peut être acheminé par une pompe d'alimentation, par l'intermédiaire d'une conduite d'alimentation, en complément en cas de quantité insuffisante dans le circuit. La conduite d'alimentation peut être déchargée par l'intermédiaire d'un ensemble à soupape de limitation de pression du type décrit ci-dessus, présentant différentes pressions de réponse.
PCT/EP2012/004996 2011-12-14 2012-12-04 Soupape de limitation de pression et circuit hydraulique fermé comprenant une soupape de limitation de pression WO2013087156A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110121052 DE102011121052A1 (de) 2011-12-14 2011-12-14 Druckbegrenzungsventil und geschlossenerhydraulischer Kreis mit einem Druckbegrenzungsventil
DE102011121052.4 2011-12-14

Publications (2)

Publication Number Publication Date
WO2013087156A2 true WO2013087156A2 (fr) 2013-06-20
WO2013087156A3 WO2013087156A3 (fr) 2013-08-08

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Application Number Title Priority Date Filing Date
PCT/EP2012/004996 WO2013087156A2 (fr) 2011-12-14 2012-12-04 Soupape de limitation de pression et circuit hydraulique fermé comprenant une soupape de limitation de pression

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DE (1) DE102011121052A1 (fr)
WO (1) WO2013087156A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116357776A (zh) * 2023-06-02 2023-06-30 太原理工大学 用于液压支架的三通调速阀

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020210093A1 (de) 2020-08-10 2022-02-10 Robert Bosch Gesellschaft mit beschränkter Haftung Hydraulischer Antrieb vor eine Bohrvorrichtung
DE102022210469A1 (de) 2022-10-04 2024-04-04 Robert Bosch Gesellschaft mit beschränkter Haftung Druckbegrenzungsventilanordnung, modulare Druckbegrenzungsventilanordnung und hydraulische Steueranordnung mit einer derartigen Druckbegrenzungsventilanordnung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19640545A1 (de) 1996-10-01 1998-04-02 Zahnradfabrik Friedrichshafen Hydrostatischer Antrieb für eine Trommel eines Transportbetonmischers
DE102004057740B4 (de) 2004-11-30 2006-10-19 Brueninghaus Hydromatik Gmbh Hydraulischer Kreislauf mit Speisepumpe

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2241764B1 (fr) * 2009-04-17 2011-08-31 HAWE Hydraulik SE Soupape à siège dotée d'une fonction de soupape de dérivation et de compensateur de pression
JP4942833B2 (ja) * 2010-04-07 2012-05-30 アイシン精機株式会社 リリーフ圧力変更機能付きリリーフバルブ

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19640545A1 (de) 1996-10-01 1998-04-02 Zahnradfabrik Friedrichshafen Hydrostatischer Antrieb für eine Trommel eines Transportbetonmischers
DE102004057740B4 (de) 2004-11-30 2006-10-19 Brueninghaus Hydromatik Gmbh Hydraulischer Kreislauf mit Speisepumpe

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116357776A (zh) * 2023-06-02 2023-06-30 太原理工大学 用于液压支架的三通调速阀
CN116357776B (zh) * 2023-06-02 2023-08-01 太原理工大学 用于液压支架的三通调速阀

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Publication number Publication date
DE102011121052A1 (de) 2013-06-20
WO2013087156A3 (fr) 2013-08-08

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