EP0310134A2 - Hydraulic control system for vehicles used in agriculture and civil engineering - Google Patents

Hydraulic control system for vehicles used in agriculture and civil engineering Download PDF

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Publication number
EP0310134A2
EP0310134A2 EP88116284A EP88116284A EP0310134A2 EP 0310134 A2 EP0310134 A2 EP 0310134A2 EP 88116284 A EP88116284 A EP 88116284A EP 88116284 A EP88116284 A EP 88116284A EP 0310134 A2 EP0310134 A2 EP 0310134A2
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EP
European Patent Office
Prior art keywords
pressure
control
line
switch
way 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.)
Granted
Application number
EP88116284A
Other languages
German (de)
French (fr)
Other versions
EP0310134B1 (en
EP0310134A3 (en
Inventor
Heribert Dipl.-Landw. Adams
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.)
Kloeckner Humboldt Deutz AG
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Kloeckner Humboldt Deutz AG
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Publication date
Application filed by Kloeckner Humboldt Deutz AG filed Critical Kloeckner Humboldt Deutz AG
Priority to AT88116284T priority Critical patent/ATE79664T1/en
Publication of EP0310134A2 publication Critical patent/EP0310134A2/en
Publication of EP0310134A3 publication Critical patent/EP0310134A3/en
Application granted granted Critical
Publication of EP0310134B1 publication Critical patent/EP0310134B1/en
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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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • 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
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30585—Assemblies of multiple valves having a single valve for multiple output members
    • 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
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
    • 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
    • F15B2211/3138—Directional control characterised by the positions of the valve element the positions being discrete
    • 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
    • F15B2211/321—Directional control characterised by the type of actuation mechanically
    • F15B2211/322—Directional control characterised by the type of actuation mechanically actuated by biasing means, e.g. spring-actuated
    • 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
    • F15B2211/321—Directional control characterised by the type of actuation mechanically
    • F15B2211/324—Directional control characterised by the type of actuation mechanically manually, e.g. by using a lever or pedal
    • 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
    • F15B2211/355—Pilot pressure control
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6309—Electronic controllers using input signals representing a pressure the pressure being a pressure source supply 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/67—Methods for controlling pilot 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders

Definitions

  • the invention relates to a hydraulic control device for the working hydraulics of a vehicle which can be used, in particular, in agriculture and construction, preferably for a constant current system with at least one control slide which can be fixed by a spring-loaded catch and can be hydraulically disengaged by the pressure in a control line and which, after being released, by means of a restoring force is automatically reset to its neutral position, the unlatching of the control spool is triggered when the operating pressure is reached at the switched-on consumer and is delayed by means of a delay device in the control line, which in turn is connected to the pump pressure line in the flow direction in front of the control spool in order to apply control pressure to the pump pressure line is.
  • each of the catches acting on the control valves is designed as part of a piston guided in a cylinder, which is operated by spring force in the blocking direction and by pressure fluid in the Unlocking sense is applied.
  • the hydraulic spaces of the catches are connected to one another by a control line, which is connected directly to the pump pressure line via a hydraulic delay device for supplying hydraulic fluid.
  • the delay device consists exclusively of hydraulic components, which, however, at least partially require special manufacture due to their mode of operation. A device made of such components is quite expensive.
  • the invention has for its object to provide a delay device for a hydraulic control device of the type outlined at the outset, which can be produced inexpensively without custom-made components using commercially available simple means.
  • control line for the detent behind the bias valve a pressure cell for actuating a switch and parallel to it via a throttle and a check valve parallel to the detent, an electromagnetically or spring-actuated two-way valve is connected, which in the open position Control line connects to the line leading from the control slide to another downstream control unit and that the switch of the pressure cell forms an electrical circuit with the electromagnetic actuator of the two-way valve in connection with a current source, which is controlled by a delay relay.
  • the electromagnetic two-way valve is loaded by a spring in the closing direction and that the switch of the pressure cell is in its unstressed state in the closed position and comes into the open position when the pressure in the pressure cell increases.
  • the electromagnetic two-way valve is loaded by a spring in the opening direction and that the switch of the pressure cell is in its open state in the open position and comes into the closed position when the pressure in the pressure cell rises.
  • the circuit formed from the electromagnetic actuator of the two-way valve, the switch of the pressure cell and the relay can be connected to the positive pole of a power source via a switch arranged in the ignition lock of the vehicle.
  • a control slide 1 designed as a multi-way valve is provided, which is used to actuate, for example, an actuating cylinder (not shown).
  • This hydraulic consumer is connected to lines 2, 3.
  • Springs 4 and 5 acting on both sides of the control slide 1 ensure the centering of the movable slide part in the neutral position shown.
  • the control slide 1 has a detent 6 which is effective in several switching positions and can be mechanically engaged by spring force and hydraulically disengaged.
  • the catch 6 has a plunger 8 which is loaded by the force of a spring 7 and which, depending on the switching position of the control slide 1, engages in one of a plurality of recesses 9 in a slide part 10.
  • the detent 6 For hydraulic actuation of the detent 6, it has a hydraulic actuator 11 which acts against the force of the spring 7 and which is coupled to a two-way valve 12.
  • a control line 14 provided for supplying the detent 6 with pressure fluid is connected to the actuator 11 by a line 15 and to the two-way valve 12 by a line 16 branching off the line 15.
  • the line 16 In the open position of the two-way valve 12 shown, which is caused by the spring 7, the line 16 is connected to the collecting container for pressure fluid by a throttle 17 arranged in the spool of the two-way valve 12 by a line 18 connected to the outlet side thereof.
  • the control slide 1 has on the output side through a line 27 a connection to the line 18, which in turn is connected via a line 28 to the collecting container 19.
  • a biasing valve 29 is used to supply the control line 14 with pressure fluid, which is connected on the input side to the pressure line 22 and on the output side through a line 30 to a pressure cell 31.
  • the control line 14 is connected to the line 30 by switching on a throttle 32 and a check valve 33.
  • the hydraulic system has an electrical delay device 35 for the hydraulic actuation of the catch 6.
  • the delay device 35 has a two-way valve 37 which is acted upon by the force of a spring 36 in the closing direction and which is actuated by an electromagnetic actuator 38 in the opening direction.
  • the two-way valve 3 is connected on the input side to the control line 14 and on the output side by a line 39 to the line 23 leading from the control slide 1 to the control unit 24.
  • a switch 40 actuated by the latter, which is closed when the pressure cell 31 is unloaded and is connected on the one hand via ground to the negative pole of a power source and on the other hand via a line 41 to the electromagnetic actuator 38 of the two-way valve 37.
  • the actuator 38 is also by a Line 42 and a fuse 43 are connected to the positive pole of a power source via a switch 44 operating in the ignition lock of the vehicle.
  • a relay 45 is used as the delay element, which is connected to ground at the negative pole of the current source with a connection 46. There are also connections of the delay relay 45 through a line 47 to line 42 and by a line 48 to line 41.
  • the switch 44 When starting the engine of the vehicle, the switch 44 is actuated in the closing direction, so that a circuit is closed by the line 42, the actuator 38, line 41 and the switch 40 in the closed position. As a result, the two-way valve 37 comes into the open position, so that the lines 14 and 39 come into connection with one another.
  • the hydraulic pump 20, which is constantly driven by the internal combustion engine, conveys hydraulic fluid through the pressure line 22 to the hydraulic system, so that when the control spool 1 is in neutral position, a circulating pressure is built up by the control unit 24 arranged at the end of the line 23, which pressure is then present in all lines connected directly to it.
  • control spool 1 If control spool 1 is now shifted from the neutral position shown into an adjacent working position, then the consumer connected to lines 2, 3 is pressurized with pressurized liquid, while at the same time the inflow of pressurized liquid to line 23 or to control controller 24 is interrupted. The line 23 is therefore depressurized. If the control slide 1 reaches the desired working position during its displacement, then the plunger 8 of the catch 6 engages in the corresponding recess 9 on the slide part 10 by the force of the spring 7. When supplying the on the spool 1 closed consumer, for example an actuating cylinder, the pressure in line 22 rises when the piston is in the final position in the actuating cylinder, so that finally the preload valve 29 connected to line 22 opens at a predetermined pressure and releases pressure fluid into control line 30.
  • a pressure is built up in the control line 30 so that hydraulic fluid passes through the throttle 32 and the check valve 33 into the control line 14.
  • No significant pressure can initially build up in the control line 14, since pressure fluid can continuously flow from the control line 14 through the open two-way valve 37 to line 23 and through lines 15, 16 and the throttle 17 in the two-way valve 16 to the return.
  • the switch 40 Due to the pressure increase in the control line 30, the switch 40 is opened via the pressure cell 31, so that the circuit closed via this is interrupted.
  • the delay relay 45 keeps the circuit closed for a time via the electromagnetic actuator 38, so that the two-way valve 37 initially remains in the open position.
  • the pressure reduction leads to the opening of the switch 40 via the pressure cell 31, so that the two-way valve 37 opens and releases the direct paths from the control line 14 to the lines 39 and 23 pressurized with circulating pressure.
  • the hydraulic system is now back in the starting position and a new switching operation can take place on the control slide 1.
  • FIG. 2 shows a delay device 50, the structure of which essentially corresponds to that of the delay device 35 in FIG. 1.
  • the delay device 50 uses a delay relay 51 which closes a circuit with a delay when its excitation current is switched on.
  • a two-way valve 52 is provided, which is actuated by the force of a spring 53 in the opening direction and by an electromagnetic actuator 54 in the closing direction.
  • On the pressure cell 55 of this device there is a switch 56 which is in the starting position, i.e. with the pressurized can 55 in the open position.
  • the operation of this delay device 50 is such that the switch 56 closes at a certain pressure in the pressure cell 55, so that the delay relay 51 moves the two-way valve 52 against the force of the spring 53 with a delay in the closing direction against the force of the spring 53.

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  • 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)
  • Vehicle Body Suspensions (AREA)

Abstract

Hydraulic control system for a tractor, with a control unit (24) for the power lift with at least one directional control valve (1) connected in the supply line (22, 23) to the control unit (24) and having neutral circulation for the pressure fluid, the directional control valve (1) serving to switch a consuming device on or off and being provided with a detent (6) which can be engaged automatically by spring force and disengaged by pressure fluid and, after an operation at the consuming device is complete, can in each case be unlocked in a delayed manner by an electro-hydraulic switching device (35 or 50). <IMAGE>

Description

Die Erfindung bezieht sich auf eine hydraulische Steuer­einrichtung für die Arbeitshydraulik eines insbesondere land- und bauwirtschaftlich nutzbaren Fahrzeugs, vorzugs­weise für ein Konstantstromsystem mit zumindest einem durch eine federbelastete Raste festlegbaren und durch diese vom Druck in einer Steuerleitung hydraulisch aus­rückbaren Steuerschieber, der nach Entrastung mittels einer Rückstellkraft selbsttätig in seine Neutralstellung zurückgestellt wird, wobei die Entrastung des Steuerschie­bers jeweils bei Erreichen des Betriebsdruckes am einge­schalteten Verbraucher ausgelöst wird und verspätet mit­tels einer Verzögerungseinrichtung in der Steuerleitung einsetzt, die ihrerseits zur Beaufschlagung mit Steuer­druck über ein Vorspannventil mit der Pumpendruckleitung in Strömungsrichtung vor dem Steuerschieber verbunden ist.The invention relates to a hydraulic control device for the working hydraulics of a vehicle which can be used, in particular, in agriculture and construction, preferably for a constant current system with at least one control slide which can be fixed by a spring-loaded catch and can be hydraulically disengaged by the pressure in a control line and which, after being released, by means of a restoring force is automatically reset to its neutral position, the unlatching of the control spool is triggered when the operating pressure is reached at the switched-on consumer and is delayed by means of a delay device in the control line, which in turn is connected to the pump pressure line in the flow direction in front of the control spool in order to apply control pressure to the pump pressure line is.

Es ist aus der DE-OS 33 34 253 eine gattungsgleiche hy­draulische Steuereinrichtung für die Arbeitshydraulik eines Schleppers bekanntgeworden, bei der jede der an den Steuerventilen angreifenden Rasten als Teil eines in einem Zylinder geführten Kolbens ausgebildet ist, der durch Federkraft im Sperrsinn und durch Druckflüssigkeit im Entriegelungssinn beaufschlagt wird. Die hydraulischen Räume der Rasten sind durch eine Steuerleitung miteinander verbunden, die zur Versorgung mit Druckflüssigkeit über eine hydraulische Verzögerungseinrichtung unmittelbar mit der Pumpendruckleitung in Verbindung steht. Bei dieser bekannten Steuereinrichtung besteht die Verzögerungsein­richtung ausschließlich aus hydraulischen Bauelementen, die jedoch aufgrund ihrer Wirkungsweise zumindest teilwei­se einer besonderen Anfertigung bedürfen. Eine Einrichtung aus derartigen Bauteilen ist recht kostenaufwendig.It is known from DE-OS 33 34 253 a generic hydraulic control device for the working hydraulics of a tractor, in which each of the catches acting on the control valves is designed as part of a piston guided in a cylinder, which is operated by spring force in the blocking direction and by pressure fluid in the Unlocking sense is applied. The hydraulic spaces of the catches are connected to one another by a control line, which is connected directly to the pump pressure line via a hydraulic delay device for supplying hydraulic fluid. In this known control device, the delay device consists exclusively of hydraulic components, which, however, at least partially require special manufacture due to their mode of operation. A device made of such components is quite expensive.

Der Erfindung liegt die Aufgabe zugrunde, eine Verzöge­rungseinrichtung für eine hydraulische Steuereinrichtung der eingangs umrissenen Gattung zu schaffen, die sich ohne Sonderanfertigungen von Bauteilen mit handelsüblichen einfachen Mitteln kostengünstig herstellen läßt.The invention has for its object to provide a delay device for a hydraulic control device of the type outlined at the outset, which can be produced inexpensively without custom-made components using commercially available simple means.

Die Aufgabe wird erfindungsgemäß dadurch gelöst, daß an die Steuerleitung für die Raste hinter dem Vorspannventil eine Druckdose zur Betätigung eines Schalters und parallel dazu über eine Drossel sowie ein Rückschlagventil parallel zur Raste ein elektromagnetisch bzw. mit Federkraft betä­tigbares Zweiwegeventil angeschlossen ist, das in Offen­stellung die Steuerleitung mit der vom Steuerschieber zu einem weiteren nachgeschalteten Steuergerät führenden Leitung verbindet und daß der Schalter der Druckdose mit dem elektromagnetischen Stellorgan des Zweiwegeventils in Verbindung mit einer Stromquelle einen elektrischen Schaltkreis bildet, der von einem Verzögerungsrelais be­herrscht wird.The object is achieved in that to the control line for the detent behind the bias valve, a pressure cell for actuating a switch and parallel to it via a throttle and a check valve parallel to the detent, an electromagnetically or spring-actuated two-way valve is connected, which in the open position Control line connects to the line leading from the control slide to another downstream control unit and that the switch of the pressure cell forms an electrical circuit with the electromagnetic actuator of the two-way valve in connection with a current source, which is controlled by a delay relay.

Alle hierfür benötigten elektrischen Bauteile können in der erforderlichen Ausführung fertig bezogen werden, so daß die Verzögerungseinrichtung kostengünstig herstellbar ist. Außerdem sind die Schaltverbindungen bei elektrischen Bauteilen leichter herzustellen, als bei hydraulischen Bauteilen, zumal in vielen Fällen vorgefertigte Leiter­platten zur Anwendung kommen.All the electrical components required for this can be obtained in the required version, so that the delay device is inexpensive to manufacture. In addition, the switching connections for electrical components are easier to manufacture than for hydraulic components, especially since prefabricated printed circuit boards are used in many cases.

Bei einem Relais, dessen Erregerstrom bei Abschaltung verzögert unterbrochen wird, ist vorgesehen, daß das elek­tromagnetische Zweiwegeventil im Schließsinn durch eine Feder belastet ist und daß der Schalter der Druckdose sich in deren unbeaufschlagtem Zustand in Schließstellung be­findet sowie bei Druckanstieg in der Druckdose in Offen­stellung gelangt.In the case of a relay whose excitation current is interrupted with a delay when switched off, it is provided that the electromagnetic two-way valve is loaded by a spring in the closing direction and that the switch of the pressure cell is in its unstressed state in the closed position and comes into the open position when the pressure in the pressure cell increases.

Bei einem Relais, das bei Abschaltung des Erregerstromes verzögert schließt, ist vorgesehen, daß das elektromagne­tische Zweiwegeventil im Öffnungssinn durch eine Feder belastet ist und daß der Schalter der Druckdose sich in deren unbeaufschlagtem Zustand in Offenstellung befindet sowie bei Druckanstieg in der Druckdose in Schließstellung gelangt.In the case of a relay which closes with a delay when the excitation current is switched off, it is provided that the electromagnetic two-way valve is loaded by a spring in the opening direction and that the switch of the pressure cell is in its open state in the open position and comes into the closed position when the pressure in the pressure cell rises.

Schließlich ist es zweckdienlich, wenn der aus dem elek­tromagnetischen Stellorgan des Zweiwegeventils, dem Schal­ter der Druckdose und dem Relais gebildete Stromkreis über ein im Zündschloß des Fahrzeugs angeordneten Schalter mit dem Pluspol einer Stromquelle verbindbar ist.Finally, it is useful if the circuit formed from the electromagnetic actuator of the two-way valve, the switch of the pressure cell and the relay can be connected to the positive pole of a power source via a switch arranged in the ignition lock of the vehicle.

Zwei Ausführungsbeispiele der Erfindung sind im folgenden anhand der Zeichnung näher beschrieben:
Es zeigt:

  • Fig. 1 eine schematische Darstellung einer hydraulischen Steuereinrichtung gemäß der Erfindung;
  • Fig. 2 ein anderes Ausführungsbeispiel.
Two exemplary embodiments of the invention are described in more detail below with reference to the drawing:
It shows:
  • Figure 1 is a schematic representation of a hydraulic control device according to the invention.
  • Fig. 2 shows another embodiment.

In der als Blockschaltbild gezeigten hydraulischen Steuer­einrichtung ist ein als Mehrwegeventil ausgebildeter Steu­erschieber 1 vorgesehen, das zur Betätigung beispielsweise eines nicht dargestellten Stellzylinders dient. Dieser hydraulische Verbraucher ist an Leitungen 2, 3 angeschlos­sen. Beiderseits des Steuerschiebers 1 angreifende Federn 4 bzw. 5 sorgen für die Zentrierung des beweglichen Schie­berteils in der gezeigten Neutralstellung. Ferner hat der Steuerschieber 1 eine in mehreren Schaltstellungen wirksa­me Raste 6, die mechanisch durch Federkraft einrückbar und hydraulisch ausrückbar ist. Die Raste 6 hat einen durch die Kraft einer Feder 7 belasteten Stößel 8, der je nach Schaltstellung des Steuerschiebers 1 in eine von mehreren Ausnehmungen 9 eines schieberteils 10 eingreift. Zur hy­draulischen Betätigung der Raste 6 hat diese ein entgegen der Kraft der Feder 7 wirkendes hydraulisches Stellorgan 11, das mit einem Zweiwegeventil 12 gekoppelt ist. Eine zur Versorgung der Raste 6 mit Druckflüssigkeit vorgesehe­ne Steuerleitung 14 ist durch eine Leitung 15 mit dem Stellorgan 11 und durch eine von der Leitung 15 abzweigen­de Leitung 16 mit dem Zweiwegeventil 12 verbunden. Bei der gezeigten, durch die Feder 7 bewirkten Offenstellung des Zweiwegeventils 12 ist die Leitung 16 durch eine im Schie­der des Zweiwegeventils 12 angeordnete Drossel 17 durch eine ausgangsseitig an diese anschließende Leitung 18 mit dem Sammelbehälter für Druckflüssigkeit verbunden.In the hydraulic control device shown as a block diagram, a control slide 1 designed as a multi-way valve is provided, which is used to actuate, for example, an actuating cylinder (not shown). This hydraulic consumer is connected to lines 2, 3. Springs 4 and 5 acting on both sides of the control slide 1 ensure the centering of the movable slide part in the neutral position shown. Furthermore, the control slide 1 has a detent 6 which is effective in several switching positions and can be mechanically engaged by spring force and hydraulically disengaged. The catch 6 has a plunger 8 which is loaded by the force of a spring 7 and which, depending on the switching position of the control slide 1, engages in one of a plurality of recesses 9 in a slide part 10. For hydraulic actuation of the detent 6, it has a hydraulic actuator 11 which acts against the force of the spring 7 and which is coupled to a two-way valve 12. A control line 14 provided for supplying the detent 6 with pressure fluid is connected to the actuator 11 by a line 15 and to the two-way valve 12 by a line 16 branching off the line 15. In the open position of the two-way valve 12 shown, which is caused by the spring 7, the line 16 is connected to the collecting container for pressure fluid by a throttle 17 arranged in the spool of the two-way valve 12 by a line 18 connected to the outlet side thereof.

Zur Versorgung der Steuereinrichtung mit Druckflüssigkeit dient eine Hydropumpe 20, die saugseitig an den Sammelbe­hälter 19 und ausgangsseitig mittels einer Druckleitung 22 an den Steuerschieber 1 angeschlossen ist. Vom Steuer­ schieber 1 führt ausgangsseitig eine Leitung 23 zu einem Regelsteuergerät 24, das zur Betätigung eines hinter einem Rückschlagventil 25 an eine Leitung 26 angeschlossenen, nicht dargestellten Krafthebers dient.A hydraulic pump 20, which is connected on the suction side to the collecting container 19 and on the outlet side by means of a pressure line 22 to the control slide 1, serves to supply the control device with pressure fluid. From the wheel slide 1 leads on the output side a line 23 to a control unit 24, which serves to actuate a power lift, not shown, connected to a line 26 behind a check valve 25.

Der Steuerschieber 1 hat ausgangsseitig durch eine Leitung 27 eine Verbindung mit der leitung 18, die ihrerseits durch eine Leitung 28 an den Sammelbehälter 19 angeschlos­sen ist. Zur Versorgung der Steuerleitung 14 mit Druck­flüssigkeit dient ein Vorspannventil 29, das eingangssei­tig an die Druckleitung 22 und ausgangsseitig durch eine Leitung 30 mit einer Druckdose 31 in Verbindung steht. An die Leitung 30 ist die Steuerleitung 14 unter Einschaltung einer Drossel 32 sowie eines Rückschlagventils 33 ange­schlossen.The control slide 1 has on the output side through a line 27 a connection to the line 18, which in turn is connected via a line 28 to the collecting container 19. A biasing valve 29 is used to supply the control line 14 with pressure fluid, which is connected on the input side to the pressure line 22 and on the output side through a line 30 to a pressure cell 31. The control line 14 is connected to the line 30 by switching on a throttle 32 and a check valve 33.

Das hydraulische System hat eine elektrische Verzögerungs­einrichtung 35 für die hydraulische Betätigung der Raste 6. Die Verzögerungseinrichtung 35 weist ein durch die Kraft einer Feder 36 im Schließsinn beaufschlagtes Zwei­wegeventil 37 auf, das durch ein elektromagnetisches Stellorgan 38 im Öffnungssinn betätigt wird. Das Zweiwege­ventil 3 ist eingangsseitig an die Steuerleitung 14 und ausgangsseitig durch eine Leitung 39 an die vom Steuer­schieber 1 zum Regelsteuergerät 24 führende Leitung 23 angeschlossen.The hydraulic system has an electrical delay device 35 for the hydraulic actuation of the catch 6. The delay device 35 has a two-way valve 37 which is acted upon by the force of a spring 36 in the closing direction and which is actuated by an electromagnetic actuator 38 in the opening direction. The two-way valve 3 is connected on the input side to the control line 14 and on the output side by a line 39 to the line 23 leading from the control slide 1 to the control unit 24.

An der Druckdose 31 sitzt ein von dieser betätigter Schal­ter 40, der bei entlasteter Druckdose 31 geschlossen ist und einerseits über Masse mit dem Minuspol einer Strom­quelle sowie andererseits durch eine Leitung 41 mit dem elektromagnetischen Stellorgan 38 des Zweiwegeventils 37 verbunden ist. Das Stellorgan 38 ist außerdem durch eine Leitung 42 und eine Sicherung 43 über ein im Zündschloß des Fahrzeugs betätigenden schalter 44 an den Pluspol einer Stromquelle angeschlossen. Als Verzögerungselement dient ein Relais 45, das mit einem Anschluß 46 über Masse am Minuspol der Stromquelle liegt. Ferner bestehen Verbin­dungen des Verzögerungsrelais 45 durch eine Leitung 47 mit der Leitung 42 sowie durch eine Leitung 48 mit der Leitung 41.On the pressure cell 31 is a switch 40 actuated by the latter, which is closed when the pressure cell 31 is unloaded and is connected on the one hand via ground to the negative pole of a power source and on the other hand via a line 41 to the electromagnetic actuator 38 of the two-way valve 37. The actuator 38 is also by a Line 42 and a fuse 43 are connected to the positive pole of a power source via a switch 44 operating in the ignition lock of the vehicle. A relay 45 is used as the delay element, which is connected to ground at the negative pole of the current source with a connection 46. There are also connections of the delay relay 45 through a line 47 to line 42 and by a line 48 to line 41.

Beim Anlassen der Brennkraftmaschine des Fahrzeugs wird der Schalter 44 im Schließsinn betätigt, so daß durch die Leitung 42, das Stellorgan 38, Leitung 41 sowie den in Schließstellung befindlichen Schalter 40 ein Stromkreis geschlossen wird. Demzufolge gelangt das Zweiwegeventil 37 in Offenstellung, so daß die Leitungen 14 und 39 miteinan­der in Verbindung kommen. Die von der Brennkraftmaschine ständig angetriebene Hydropumpe 20 fördert Druckflüssig­keit durch die Druckleitung 22 zum hydraulischen System, wodurch bei Neutralstellung des Steuerschiebers 1 durch das am Ende der Leitung 23 angeordnete Regelsteuergerät 24 ein Umlaufdruck aufgebaut wird, der dann in allen damit direkt verbundenen Leitungen ansteht. Wird nun der Steuer­schieber 1 aus der gezeigten Neutralstellung in eine be­nachbarte Arbeitsstellung verschoben, dann erfolgt eine Beaufschlagung des an die Leitungen 2, 3 angeschlossenen Verbrauchers mit Druckflüssigkeit, während gleichzeitig der Zufluß von Druckflüssigkeit zur Leitung 23 bzw. zum Regelsteuergerät 24 unterbrochen wird. Die Leitung 23 wird folglich drucklos. Erreicht der Steuerschieber 1 bei sei­ner Verschiebung die gewünschte Arbeitsstellung, dann rastet der Stößel 8 der Raste 6 durch die Kraft der Feder 7 in die entsprechende Aussparung 9 am Schieberteil 10 ein. Bei der Versorgung des am Steuerschieber 1 ange­ schlossenen Verbrauchers, beispielsweise eines Stellzylin­ders, steigt der Druck in der Leitung 22 bei Endlage des Kolbens im Stellzylinder, so daß schließlich bei einem vorbestimmten Druck das an die Leitung 22 angeschlossene Vorspannventil 29 öffnet und Druckflüssigkeit in die Steu­erleitung 30 entläßt. Hierdurch wird in der Steuerleitung 30 ein Druck aufgebaut, so daß Druckflüssigkeit durch die Drossel 32 und das Rückschlagventil 33 in die Steuerlei­tung 14 gelangt. In der Steuerleitung 14 kann sich zu­nächst kein nennenswerter Druck aufbauen, da ständig Druckflüssigkeit von der Steuerleitung 14 durch das offene Zweiwegeventil 37 zur Leitung 23 und durch die Leitungen 15, 16 und die Drossel 17 im Zweiwegeventil 16 zum Rück­lauf abströmen kann. Durch den druckanstieg in der Steuer­leitung 30 wird über die Druckdose 31 der Schalter 40 geöffnet, so daß der über diesen geschlossene Stromkreis unterbrochen wird. Das Verzögerungsrelais 45 hält jedoch den Stromkreis über das elektromagnetische Stellorgan 38 noch für eine Zeit geschlossen, so daß das Zweiwegeventil 37 zunächst noch in Offenstellung bleibt. Erst nach Unter­brechung des Stromkreises durch das Verzögerungsrelais 45 wird das Zweiwegeventil 37 durch die Kraft der Feder 36 geschlossen und es kann sich in der Steuerleitung 14 der volle Steuerdruck aufbauen, der Schließlich zum Auslösen der Raste 9 führt. Der Steuerschieber 1 wird folglich durch die Kraft der entsprechenden Feder 4 bzw. 5 wieder in seine Neutralstellung zurückgestellt. Folglich verbin­det der Steuerschieber 1 wieder die Druckleitung 22 mit der Leitung 23, die das Regelsteuergerät 24 mit Druckmit­tel versorgt. In den Leitungen 22, 23 und in dem damit verbundenen Leitungssytem stellt sich folglich wieder ein Umlaufdruck ein, für den das Vorspannventil 29 gesperrt ist. In der Steuerleitung 30 und ebenso in der Steuerlei­ tung 14 fällt der Druck ab, da diese Durch die Drossel 17 im Zweiwegeventil 12 mit dem Rücklauf in Verbindung steht. Die Druckminderung führt über die Druckdose 31 zum Öffnen des Schalters 40, so daß das Zweiwegeventil 37 öffnet und den direkten Wege von der Steuerleitung 14 zu den mit Umlaufdruck beaufschlagten Leitungen 39 und 23 freigibt. Damit befindet sich das hydraulische System wieder in Ausgangslage und es kann ein neuer Schaltvorgang am Steu­erschieber 1 erfolgen.When starting the engine of the vehicle, the switch 44 is actuated in the closing direction, so that a circuit is closed by the line 42, the actuator 38, line 41 and the switch 40 in the closed position. As a result, the two-way valve 37 comes into the open position, so that the lines 14 and 39 come into connection with one another. The hydraulic pump 20, which is constantly driven by the internal combustion engine, conveys hydraulic fluid through the pressure line 22 to the hydraulic system, so that when the control spool 1 is in neutral position, a circulating pressure is built up by the control unit 24 arranged at the end of the line 23, which pressure is then present in all lines connected directly to it. If control spool 1 is now shifted from the neutral position shown into an adjacent working position, then the consumer connected to lines 2, 3 is pressurized with pressurized liquid, while at the same time the inflow of pressurized liquid to line 23 or to control controller 24 is interrupted. The line 23 is therefore depressurized. If the control slide 1 reaches the desired working position during its displacement, then the plunger 8 of the catch 6 engages in the corresponding recess 9 on the slide part 10 by the force of the spring 7. When supplying the on the spool 1 closed consumer, for example an actuating cylinder, the pressure in line 22 rises when the piston is in the final position in the actuating cylinder, so that finally the preload valve 29 connected to line 22 opens at a predetermined pressure and releases pressure fluid into control line 30. As a result, a pressure is built up in the control line 30 so that hydraulic fluid passes through the throttle 32 and the check valve 33 into the control line 14. No significant pressure can initially build up in the control line 14, since pressure fluid can continuously flow from the control line 14 through the open two-way valve 37 to line 23 and through lines 15, 16 and the throttle 17 in the two-way valve 16 to the return. Due to the pressure increase in the control line 30, the switch 40 is opened via the pressure cell 31, so that the circuit closed via this is interrupted. The delay relay 45, however, keeps the circuit closed for a time via the electromagnetic actuator 38, so that the two-way valve 37 initially remains in the open position. Only after the circuit has been interrupted by the delay relay 45 is the two-way valve 37 closed by the force of the spring 36 and the full control pressure can build up in the control line 14, which finally leads to the release of the detent 9. The control slide 1 is consequently reset to its neutral position by the force of the corresponding spring 4 or 5. Consequently, the control slide 1 connects the pressure line 22 to the line 23, which supplies the control unit 24 with pressure medium. In the lines 22, 23 and in the line system connected therewith, a circulation pressure is consequently set again, for which the preload valve 29 is blocked. In the control line 30 and also in the tax office device 14, the pressure drops since it is connected to the return line through the throttle 17 in the two-way valve 12. The pressure reduction leads to the opening of the switch 40 via the pressure cell 31, so that the two-way valve 37 opens and releases the direct paths from the control line 14 to the lines 39 and 23 pressurized with circulating pressure. The hydraulic system is now back in the starting position and a new switching operation can take place on the control slide 1.

In Figur 2 ist eine Verzögerungseinrichtung 50 gezeigt, deren Aufbau im wesentlichen mit demjenigen der Verzöge­rungseinrichtung 35 in Fig. 1 übereinstimmt. Im Unter­schied hierzu findet bei der Verzögerungseinrichtung 50 ein Verzögerungsrelais 51 Verwendung, das einen Stromkreis bei Einschaltung seines Erregerstromes verzögert schließt. Demgemäß ist hierbei ein Zweiwegeventil 52 vorgesehen, das durch die Kraft einer Feder 53 im Öffnungssinn und durch ein elektromagnetisches Stellorgan 54 im Schließsinn betä­tigt wird. An der Druckdose 55 dieser Einrichtung sitzt ein Schalter 56, der sich in Ausgangsstellung, d.h. bei unbeaufschlagter Druckdose 55 in Offenstellung befindet. Die Wirkungsweise ist bei dieser Verzögerungseinrichtung 50 so, daß bei einem bestimmten Druck in der Druckdose 55 der schalter 56 schließt, so daß das Verzögerungsrelais 51 das Zweiwegeventil 52 über das elektromagnetische Stellor­gan 54 entgegen der Kraft der Feder 53 verzögert im Schließsinn bewegt.FIG. 2 shows a delay device 50, the structure of which essentially corresponds to that of the delay device 35 in FIG. 1. In contrast to this, the delay device 50 uses a delay relay 51 which closes a circuit with a delay when its excitation current is switched on. Accordingly, a two-way valve 52 is provided, which is actuated by the force of a spring 53 in the opening direction and by an electromagnetic actuator 54 in the closing direction. On the pressure cell 55 of this device there is a switch 56 which is in the starting position, i.e. with the pressurized can 55 in the open position. The operation of this delay device 50 is such that the switch 56 closes at a certain pressure in the pressure cell 55, so that the delay relay 51 moves the two-way valve 52 against the force of the spring 53 with a delay in the closing direction against the force of the spring 53.

Claims (4)

1. Hydraulische Steuereinrichtung für die Arbeitshy­draulik eines insbesondere land- und bauwirtschaftlich nutzbaren Fahrzeugs, vorzugsweise für ein Konstantstrom­system mit zumindest einem durch eine federbelastete Raste festlegbaren und durch diese vom Druck in einer Steuerlei­tung hydraulisch ausrückbaren Steuerschieber, der nach Entrastung mittels einer Rückstellkraft selbsttätig in seine Neutralstellung zurückgestellt wird, wobei die Ent­rastung des Steuerschiebers jeweils bei Erreichen des Betriebsdruckes am eingeschalteten Verbraucher ausgelöst wird und verspätet mittels einer Verzögerungseinrichtung in der Steuerleitung einsetzt, die ihrerseits zur Beauf­schlagung mit Steuerdruck über ein Vorspannventil mit der Pumpendruckleitung in Strömungsrichtung vor dem Steuer­schieber verbunden ist,
dadurch gekennzeichnet, daß die Steuerleitung (14,30) für die Raste (6) hinter dem Vorspannventil (29) an eine Druckdose (31) zur Betätigung eines Schalters (46 bzw. 56) und parallel dazu über eine Drossel (32) sowie ein Rück­schlagventil (33) parallel zur Raste (6) an ein elektro­magnetisch bzw. mit Federkraft betätigbares Zweiwegeventil (37 bzw. 52) angeschlossen ist, das in Offenstellung die Steuerleitung (14,30) mit der vom Steuerschieber (1) zu einem weiteren nachgeschalteten Steuergerät führenden Leitung (23) verbindet und daß der Schalter (46 bzw. 56) der Druckdose (31 bzw. 55) mit dem elektromagnetischen Stellorgan (38 bzw. 54) des Zweiwegeventils (37 bzw. 52) in Verbindung mit einer Stromquelle einen elektrischen Schaltkreis bildet, der von einem Verzögerungsrelais (45 bzw. 56) beherrscht wird.1.Hydraulic control device for the working hydraulics of a vehicle which can be used in particular in agriculture and construction, preferably for a constant current system with at least one control slide which can be fixed by a spring-loaded catch and which can be hydraulically disengaged by the pressure in a control line and which automatically releases into its neutral position after release by means of a restoring force is reset, the unlatching of the control spool is triggered when the operating pressure is reached at the switched-on consumer and is delayed by means of a delay device in the control line, which in turn is connected to the pump pressure line in the flow direction upstream of the control spool in order to apply control pressure to it,
characterized in that the control line (14,30) for the catch (6) behind the biasing valve (29) to a pressure cell (31) for actuating a switch (46 or 56) and in parallel via a throttle (32) and a Check valve (33) parallel to the detent (6) is connected to an electromagnetically or spring-actuated two-way valve (37 or 52), which in the open position Control line (14,30) connects to the line (23) leading from the control slide (1) to a further downstream control unit and that the switch (46 or 56) of the pressure cell (31 or 55) with the electromagnetic actuator (38 or 54) of the two-way valve (37 or 52) in conjunction with a current source forms an electrical circuit which is controlled by a delay relay (45 or 56). 2. Steuereinrichtung nach Anspruch 1, wobei das Relais (45) so ausgebildet ist, daß es einen Stromkreis bei Ab­schaltung seines Erregerstromes verzögert unterbricht, dadurch gekennzeichnet, daß das elektromagnetische Zweiwe­geventil (37) im Schließsinn durch eine Feder (36) bela­stet ist und daß der Schalter (40) der Druckdose (31) sich in deren unbeaufschlagten Zustand in schließstellung be­findet sowie bei Druckanstieg in der Druckdose (31) in Offenstellung gelangt.2. Control device according to claim 1, wherein the relay (45) is designed such that it interrupts a circuit with a delay when its excitation current is switched off, characterized in that the electromagnetic two-way valve (37) is loaded in the closing direction by a spring (36) and that the switch (40) of the pressure cell (31) is in its unloaded state in the closed position and comes into the open position when the pressure in the pressure cell (31) rises. 3. Steuereinrichtung nach Anspruch 1, wobei das Relais (51) so ausgebildet ist, daß es einen Stromkreis bei Ab­schaltung des Erregerstromes verzögert schließt, dadurch gekennzeichnet, daß das elektromagnetische Zweiwe­geventil (52) im Öffnungssinn durch eine Feder (53) bela­stet ist und daß der Schalter (56) der Druckdose (55) sich in deren unbeaufschlagten Zustand in Offenstellung befin­det sowie bei Druckanstieg in der Druckdose (55) in Schließstellung gelangt.3. Control device according to claim 1, wherein the relay (51) is designed so that it closes a circuit with a delay when the excitation current is switched off, characterized in that the electromagnetic two-way valve (52) is loaded in the opening direction by a spring (53) and that the switch (56) of the pressure cell (55) is in its open state in the open position and comes into the closed position when the pressure in the pressure cell (55) rises. 4. Steuereinrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß der aus dem elektromagneti­schen Stellorgan (38 bzw. 54) des Zweiwegeventils (37 bzw. 52), dem Schalter (46 bzw. 56) der Druckdose (31 bzw. 55) und dem relais (45 bzw. 51) gebildete Stromkreis über ein im Zündschloß des Fahrzeugs angeordneten Schalter (44) mit dem Pluspol einer Stromquelle verbindbar ist.4. Control device according to one of the preceding claims,
characterized in that the electromagnetic actuator (38 or 54) of the two-way valve (37 or 52), the switch (46 or 56) of the pressure cell (31 or 55) and the relay (45 or 51) formed circuit can be connected to the positive pole of a power source via a switch (44) arranged in the ignition lock of the vehicle.
EP88116284A 1987-10-02 1988-10-01 Hydraulic control system for vehicles used in agriculture and civil engineering Expired - Lifetime EP0310134B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88116284T ATE79664T1 (en) 1987-10-02 1988-10-01 HYDRAULIC CONTROL DEVICE FOR THE WORKING HYDRAULICS OF AN AGRICULTURAL AND CONSTRUCTION VEHICLE.

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DE3733371 1987-10-02
DE19873733371 DE3733371A1 (en) 1987-10-02 1987-10-02 HYDRAULIC CONTROL DEVICE FOR THE WORKING HYDRAULICS OF A AGRICULTURAL AND CONSTRUCTIVE VEHICLE

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CN101660551B (en) * 2009-09-25 2011-08-24 中国北方车辆研究所 Oil gas suspension hydraulic locking device
CN103352889B (en) * 2013-07-08 2015-07-01 太原理工大学 Method for buffering hydraulic system shock of crawler loader

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EP2169273A1 (en) * 2008-09-26 2010-03-31 Zf Friedrichshafen Ag Locking device for a valve spool device
CN101660551B (en) * 2009-09-25 2011-08-24 中国北方车辆研究所 Oil gas suspension hydraulic locking device
CN103352889B (en) * 2013-07-08 2015-07-01 太原理工大学 Method for buffering hydraulic system shock of crawler loader

Also Published As

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EP0310134B1 (en) 1992-08-19
ATE79664T1 (en) 1992-09-15
EP0310134A3 (en) 1990-04-25
DE3733371A1 (en) 1989-04-13
DE3873868D1 (en) 1992-09-24

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