DE2120125A1 - Hydraulic system - Google Patents

Hydraulic system

Info

Publication number
DE2120125A1
DE2120125A1 DE19712120125 DE2120125A DE2120125A1 DE 2120125 A1 DE2120125 A1 DE 2120125A1 DE 19712120125 DE19712120125 DE 19712120125 DE 2120125 A DE2120125 A DE 2120125A DE 2120125 A1 DE2120125 A1 DE 2120125A1
Authority
DE
Germany
Prior art keywords
pressure
relief valve
regulator
pressure relief
pump
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.)
Pending
Application number
DE19712120125
Other languages
German (de)
Inventor
Hubert 7000 Stuttgart; Pahl Arnold 7016 Gerungen; Winter Sigbert 7920 Heidenheim Fromm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to DE19712120125 priority Critical patent/DE2120125A1/en
Publication of DE2120125A1 publication Critical patent/DE2120125A1/en
Pending legal-status Critical Current

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
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
    • 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
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5151—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a directional control 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
    • F15B2211/55—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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/605—Load sensing circuits
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • 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
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/8606—Control during or prevention of abnormal conditions the abnormal condition being a shock

Description

Anlage zur Patentanmeldung Hydraulikanlage Die Erfindung betrifft eine Hydraulikanlage mit einer von einem Druckregler verstellbaren Pumpe, die Druckmittel zu einem Verbraucher fördert, und mit einem parallel zur Pumpe geschalteten Druckbegrenzungsventil.System for patent application Hydraulic system The invention relates to a hydraulic system with a pump adjustable by a pressure regulator, the pressure medium promotes to a consumer, and with a pressure relief valve connected in parallel to the pump.

In derartigen Hydraulikanlagen, wie sie z. B. für Hydrogetriebe vervendet-werden, hat der Druckregler die Aufgabe, den Verbraucherdruck durch entsprechendes Einstellen der Pumpe konstant zu halten. Hierbei kommt es oft zu unerwünschten Schwingungen im Hydraulikkreis, die insbesondere von der Art des Verbrauchers abhängig sind. Durch die Schwingungen ist das Eiiitalten eines stabilen Regelvorgangs erschwert, außerdem können sie zu Beschädigungen der Anlage führen.In such hydraulic systems as they are, for. B. used for hydraulic transmissions, the pressure regulator has the task of adjusting the consumer pressure accordingly to keep the pump constant. This often leads to undesirable vibrations in the hydraulic circuit, which are particularly dependent on the type of consumer. The vibrations make it difficult to maintain a stable control process, they can also damage the system.

Der Erfindung liegt die Aufgabe zugrunde, eine Hydraulikanlage der eingangs erwahnten Art zu schaffen, in der stabile Druckvernältnisse herrschen.The invention is based on the object of a hydraulic system To create the type mentioned at the beginning, in which stable pressure conditions prevail.

Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, aaß der Ansprechdruck des Druckbegrenzungsventils niedriger liegt als derjenige des Druclrreglers.This object is achieved according to the invention in that the response pressure of the pressure relief valve is lower than that of the pressure regulator.

Eine derartige Anordnung bildet ein Regelsystem mit Hilfsregler, in dem der integral wirkende Druckregler den Hauptregler, das Druckbegrenzungsventil einen proportional wirkenden Hilfsregler bildet.Such an arrangement forms a control system with an auxiliary controller, in which the integrally acting pressure regulator has the main regulator, the pressure relief valve forms a proportionally acting auxiliary regulator.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung wiedergegeben, die in Fig, 1 eine Hydraulikanlage in schematischer Darstellung und in Fig. 2 ein Diagramm zeigt, In Fig. 1 ist mit 1 eine verstellbare Pumpe bezeichnetn deren Stellglied 2 von einem an sich bekannten Druckregler 3 mit integralem Verhalten eingestellt wird. Der Druckregler wird vom Druck in einer Leitung 4 beaufschlagt, die zu einem Verbraucher z Bo einem Hydromotor oder einem Hydrozylinder 5, führt Vom Verbraucher 5 führt eine Leitung 6 zu einem Behälter 7, aus dem die Pumpe Druckmittel über eine Saugleitung 8 ansaugt Zwischen den Leitungen 4 und 6 erstreckt sich eine Leitung 9, in die ein direkt gesteuertes Druckbegrenzungsventil 10 mit proportionalem Verhalten geschaltet ist Die Feder 11 des Druckbegrenzungsventils ist verstellbar. Das Druckbegrenzungsventil wird über eine Steuerleitung 12 beaufschlagt, welche von der Hochdruckseite der Leitung 9 ausgeht. Der Anspruchdruck des Druckbegrenzungsventils 10 ist niedriger als derjenige des druckreglers 3, und zwar um den Betrag # p. Dies ist aus dem Diagram nach Fig. 2 sichtbar. Auf der Abszisse ist der Förderstrom Q der Pumpe aufgetragen, auf der Ordinate der Druck p in der Anlage. Die DruckdifferenzÄ p soll nicht zu groß sein, da sonst die Energieverluste durch zu frühes Ansprechen des Druckbegrenzungsventils zu groß werden.An embodiment of the invention is shown in the drawing, which in Fig. 1 is a schematic representation of a hydraulic system and in Fig. 2 a Diagram shows, In Fig. 1, 1 denotes an adjustable pump whose actuator 2 set by a known pressure regulator 3 with integral behavior will. The pressure regulator is acted upon by the pressure in a line 4, which leads to a Consumer z Bo a hydraulic motor or a hydraulic cylinder 5, leads from the consumer 5 leads a line 6 to a container 7, from which the pump pressure medium via a Suction line 8 sucks A line extends between lines 4 and 6 9, in which a directly controlled pressure relief valve 10 with proportional behavior The spring 11 of the pressure relief valve is adjustable. The pressure relief valve is acted upon via a control line 12, which from the high pressure side of the Line 9 goes out. The claim pressure of the pressure relief valve 10 is lower than that of the pressure regulator 3, namely by the amount # p. This is from the diagram visible according to Fig. 2. The flow rate Q of the pump is plotted on the abscissa, on the Ordinate of the pressure p in the system. The pressure difference Ä p should not be too large, otherwise the energy losses due to too early response of the pressure relief valve become too large.

Bei einem Regel vorgang spricht zuerst stets das Druckbegrenzungsventil anß es baut u. a. auch Druckspitzen ab, erst dann folgt der Druckregler. Der Zeitunterschied hierbei ist jedoch äußerst gering. Daraus ist zu erkennen, daß das Druckbegrenzungsventil als Hilfsregler arbeitet, der Druckregler dagegen als Hauptregler.During a control process, the pressure relief valve always speaks first anß it builds, among other things. pressure peaks, only then does the pressure regulator follow. The time difference however, this is extremely small. From this it can be seen that the pressure relief valve works as an auxiliary regulator, whereas the pressure regulator works as the main regulator.

Im Diagramm kennzeichnet die schräg ansteigende Gerade die Regelcharakteristik des Druckbegrenzungsventils, die abgewinkelte Kurve das Verhalten des Druckreglers.In the diagram, the sloping straight line indicates the control characteristic of the pressure relief valve, the angled curve the behavior of the pressure regulator.

Das Druckbegrenzungsventil bewirkt durch sein günstiges dynamisches Verhalten die Stabilität der Regelung, während der Druckregler durch seine integrale Arbeitsweise die vom Druckbegrenzungsventil verursachten Energieverluste auf ein Minimum begrenzt.The pressure relief valve has a favorable dynamic effect Behavior the stability of the regulation, while the pressure regulator by its integral Mode of operation reduces the energy losses caused by the pressure relief valve Minimum limited.

Claims (3)

Ansprüche:Expectations: 1. Hydraulikanlage mit einer von einem Druckregler verstellbaren Pumpe, die Druckmittel zu einem Verbraucher fördert, und mit einem parallel zur Pumpe geschalteten Druckbegrenzungsventil, dadurch gekennzeichnet, daß der Ansprechdruck des Druckbegrenzungsventils (10) niedriger liegt als derjenige des Druck reglers (3).1.Hydraulic system with a pump that can be adjusted by a pressure regulator, promotes the pressure medium to a consumer, and with a connected in parallel to the pump Pressure relief valve, characterized in that the response pressure of the pressure relief valve (10) is lower than that of the pressure regulator (3). 2. Anlage nach Anspruch 1, dadurch gekennzeichnet, daß der Druckregler als integral wirkender Regler ausgebildet ist. 2. Plant according to claim 1, characterized in that the pressure regulator is designed as an integrally acting regulator. 3. Anlage nach Anspruch 1 und 2, dadurch gekennzeichnet, daß das Druckbegrenzungsventil Proportionalverhalten aufweist.3. Plant according to claim 1 and 2, characterized in that the pressure relief valve Has proportional behavior.
DE19712120125 1971-04-24 1971-04-24 Hydraulic system Pending DE2120125A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19712120125 DE2120125A1 (en) 1971-04-24 1971-04-24 Hydraulic system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712120125 DE2120125A1 (en) 1971-04-24 1971-04-24 Hydraulic system

Publications (1)

Publication Number Publication Date
DE2120125A1 true DE2120125A1 (en) 1972-11-16

Family

ID=5805814

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19712120125 Pending DE2120125A1 (en) 1971-04-24 1971-04-24 Hydraulic system

Country Status (1)

Country Link
DE (1) DE2120125A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2757194A1 (en) * 1976-12-23 1978-06-29 Garrett Corp HYDRAULIC CONTROL DEVICE AND METHOD FOR HYDRAULIC CONTROL
EP1180598A2 (en) * 2000-08-17 2002-02-20 Bosch Rexroth AG Valve assembly

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2757194A1 (en) * 1976-12-23 1978-06-29 Garrett Corp HYDRAULIC CONTROL DEVICE AND METHOD FOR HYDRAULIC CONTROL
EP1180598A2 (en) * 2000-08-17 2002-02-20 Bosch Rexroth AG Valve assembly
EP1180598A3 (en) * 2000-08-17 2003-04-16 Bosch Rexroth AG Valve assembly

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