DE2504521A1 - Electromagnetically operated hydraulic valve - has residual air gap to prevent magnetic locking against return spring - Google Patents

Electromagnetically operated hydraulic valve - has residual air gap to prevent magnetic locking against return spring

Info

Publication number
DE2504521A1
DE2504521A1 DE19752504521 DE2504521A DE2504521A1 DE 2504521 A1 DE2504521 A1 DE 2504521A1 DE 19752504521 DE19752504521 DE 19752504521 DE 2504521 A DE2504521 A DE 2504521A DE 2504521 A1 DE2504521 A1 DE 2504521A1
Authority
DE
Germany
Prior art keywords
armature
valve
spring
core
force
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
DE19752504521
Other languages
German (de)
Inventor
Helmut Rembold
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 DE19752504521 priority Critical patent/DE2504521A1/en
Publication of DE2504521A1 publication Critical patent/DE2504521A1/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0644—One-way valve
    • F16K31/0655—Lift valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/36—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition including a pilot valve responding to an electromagnetic force
    • B60T8/3615—Electromagnetic valves specially adapted for anti-lock brake and traction control systems
    • B60T8/363—Electromagnetic valves specially adapted for anti-lock brake and traction control systems in hydraulic systems
    • B60T8/3635—Electromagnetic valves specially adapted for anti-lock brake and traction control systems in hydraulic systems switching between more than two connections, e.g. 3/2-valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0603—Multiple-way valves
    • F16K31/0624—Lift valves
    • F16K31/0627—Lift valves with movable valve member positioned between seats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0675—Electromagnet aspects, e.g. electric supply therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

Delay in the release of a solenoid valve following switch opening can result from the residual magnetic attraction between the solenoid core and the armature. This may be prevented by controlling the dimensions so as to ensure that in the energised condition, when the valve rests on its seat (10), there remains a predetermined gap between the armature and the core. Upon de-energising, rapid opening of this valve (10) and closure of the other is achieved by an excess of spring force in the armature spring (6) over that of the valve spring (12) together with the residual magnetic attraction. A brass sleeve serves as a guide.

Description

20.1.1975 He/Kb1/20/1975 He / Kb

Anlage zur
Patent-und
GebrauchsmusterhilfsanmeldungAttachment to
Patent and
Utility model registration

ROBERT BOSCH GMBH, 7 Stuttgart 1ROBERT BOSCH GMBH, 7 Stuttgart 1 ElektromagnetventilSolenoid valve

Die Erfindung bezieht sich auf ein Elektromagnetventil mit einer von Strom durchfließbaren Spule und mit einem zentrisch in der Spule angeordneten Ankerführungsrohr aus Messing od. dergl. nichtmagnetxsierbarem Werkstoff, sowie mit einem beweglichen Anker und einem feststehenden Kern im Ankerführungsrohr, ferner mit einer Spreizfeder zwischen dem Kern und dem Anker und mit einem vom Anker über einen Stößel betätigbaren Ventilschließkörper, dessen möglicher Schalthub kleiner ist als der mögliche Anzugshub des Ankers,und mit einer Einrichtung zur Verhinderung des magnetischen Klebens des Ankers am Kern.The invention relates to an electromagnetic valve with a coil through which current can flow and with a centrally Armature guide tube made of brass or arranged in the coil Like. Non-magnetizable material, as well as with a movable armature and a fixed core in the armature guide tube, furthermore with a spreading spring between the core and the armature and with one that can be actuated by the armature via a plunger Valve closing body, the possible switching stroke of which is smaller than the possible tightening stroke of the armature, and with a device to prevent the anchor from sticking magnetically to the core.

-2--2-

609832/0549609832/0549

2 5522 552

— Ρ —- Ρ -

Ein derartiges Elektromagnetventil ist bekannt (DTOS 2 124 484). Bei dieser bekannten Bauart ist zum Verhindern des Klebens des beweglichen Ankers an dem feststehenden Kern eine Trennscheibe aus nicht magnetisierbarem Stoff vorgesehen, die kernseitig am Anker befestigt ist. Der Abstand des Ankers von dem Kern ist größer als der mögliche Ventilhub. Es ist außerdem bereits bekannt, ein magnetisches Kleben des Ankers durch einen Anschlag für den Anker zu verhindern (US-PS 2 356 577). Eine solche Bauart hat aber viele Extrateile, die ein Magnetventil verteuern. Mit derartigen Bauarten ist das Problem des magnetischen Klebens des Ankers bereits gelöst. Ein solches Problem tritt besonders bei schnellschaltenden Magnetventilen, wie sie bei Blockierschutz-Regelventilen verwendet werde^auf. Der Nachteil des Klebens ist dann eine Verlängerung der Ausschaltzeiten und der Druckabfallzeiten3 wodurch der Bremsweg verlängert wird. Darüber hinaus müssen Blockierschutz-Magnete sehr billig sein, sie sollen nur wenige Einzelteile haben.Such a solenoid valve is known (DTOS 2 124 484). In this known design, to prevent the movable armature from sticking to the stationary core, a separating disk made of non-magnetizable material is provided, which is attached to the armature on the core side. The distance between the armature and the core is greater than the possible valve lift. It is also already known to prevent magnetic sticking of the armature by means of a stop for the armature (US Pat. No. 2,356,577). However, such a design has many extra parts that make a solenoid valve more expensive. With such designs, the problem of magnetic sticking of the armature is already solved. Such a problem occurs particularly with fast-switching solenoid valves such as those used in anti-lock control valves. The disadvantage of gluing is then an extension of the switch-off times and the pressure drop times 3, whereby the braking distance is increased. In addition, anti-lock magnets must be very cheap, they should only have a few individual parts.

Der Erfindung liegt die Aufgabe zugrunde, einen Magneten der eingangs genannten Art zu schaffen, der weder einen festen Anschlag zu Klebverhinderung noch eine besondere, nicht magnetisierbare Scheibe als Trennscheibe aufweist. Vielmehr soll die Klebverhinderung durch ein entsprechendes Auswiegen und Dimensionieren der Kräfte am Anker erreicht werden, wodurch der bewegliche Anker an einer Berührung des feststehenden. Kerns gehindert wird.The invention is based on the object of a magnet to create the type mentioned, which neither a fixed stop to prevent sticking nor a special one, not Has magnetizable disc as a cutting disc. Rather, the prevention of sticking should be achieved by weighing accordingly and dimensioning of the forces at the anchor can be achieved, causing the movable armature to contact the stationary one. Kerns is prevented.

Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß die Kraft der vorgespannten Spreizfeder größer ist als die Magnetkraft am Anker nach dem Ende des Schalthubs des Ventils.This object is achieved according to the invention by that the force of the prestressed expansion spring is greater than the magnetic force on the armature after the end of the switching stroke of the valve.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und zwar zeigen:An embodiment of the invention is shown in the drawing, namely show:

609832/0549609832/0549

255? -3-255? -3-

Fig..l einen Schnitt durch ein Elektromagnetventil, Fig. 2 eine Prinzipskizze des Elektromagnetventils und Fig. 3 ein Diagramm der Kräfte am Anker.Fig..l a section through a solenoid valve, Fig. 2 a schematic diagram of the solenoid valve and Fig. 3 is a diagram of the forces on the anchor.

Ein Elektromagnetventil hat eine Spule 1, die auf einem Spulenträger 2 angeordnet ist. Im Spulenträger 2 ist ein Ankerführungsrohr 3 aus Messing befestigt, in dem ein feststehender Kern 4 und ein längsbeweglicher, aus magnetisierbar em Material bestehender Anker 5 angeordnet sind. Zwischen dem Kern 4 und dem Anker 5 befindet sich eine Spreizfeder 6, die bestrebt ist, den Anker 5 vom'Kern 4 entfernt zu halten.A solenoid valve has a spool 1 on a Coil carrier 2 is arranged. In the coil carrier 2 an armature guide tube 3 made of brass is attached, in which a fixed Core 4 and a longitudinally movable armature 5 made of magnetizable material are arranged. Between the core 4 and the armature 5 there is an expanding spring 6 which strives to remove the armature 5 from the core 4 keep away.

Der Anker 5 wird von einer Membran 7 geführt und zentriert. Eine zweite Membran 8 mit ähnlichen Führungsaufgaben trägt einen Ventilschließkorper 9, der zum Freigeben und zumThe armature 5 is guided and centered by a membrane 7. A second membrane 8 with similar management tasks carries a valve closing body 9, to release and to

Abschließen eines Druckmitteldurchgangs durch einen Ventilsitz 10 in einem Ventil 9/10 bestimmt ist und dessen Rückseite mit einem weiteren Ventilsitz 11 ein zweites Ventil 9/11 bildet.Closing a pressure medium passage through a valve seat 10 in a valve 9/10 is determined and its Back with a further valve seat 11 forms a second valve 9/11.

Der Ventilschließkorper 9 unterliegt der Kraft einer im Vergleich zur Kraft der Spreizfeder 6 schwächeren Ventilfeder 12 und trägt einen Stößel 13, der in eine Koaxialbohrung 14 des Ankers 5 mit Radialspiel eingesetzt ist. Auf diese Weise können der Anker 5 und der Ventilschließkorper 9 ihren Abstand zueinander verändern. Der Ventilschließkörper 9 hat von seinem Sitz 10 einen Abstand A, und der Anker 5 ist von dem Kern 4 um den Abstand B entfernt. Der Abstand A ist kleiner als der Abstand B. .The valve closing body 9 is subject to the force of a compared to the force of the expanding spring 6 weaker valve spring 12 and carries a plunger 13 which is in a Coaxial bore 14 of the armature 5 used with radial play is. In this way, the armature 5 and the valve closing body 9 change their distance from one another. The valve closing body 9 has a distance A from its seat 10, and the armature 5 is removed from the core 4 by the distance B. The distance A is smaller than the distance B.

609832/0549609832/0549

2 ε δ a2 ε δ a

Die Prinzipskizze zeigt die beschriebenen Gegebenheiten am Anker 5 deutlicher.The schematic diagram shows the described conditions on the anchor 5 more clearly.

Die Wirkungsweise des Elektromagnetventils wird anhand des Diagramms nach der Fig. 3 erläutert, in dem die Kräfte am Anker 5 aufgezeichnet sind. Auf der Ordinate sind die Magnetkraft und die Kräfte der Federn 6 und 12 aufgetragen und auf der Abszisse ist der Hub angegeben.The mode of operation of the solenoid valve is explained using the diagram according to FIG. 3, in which the forces are recorded on anchor 5. On the ordinate are the Magnetic force and the forces of springs 6 and 12 are plotted and the stroke is indicated on the abscissa.

Wenn der Strom eingeschaltet wird, entsteht eine Magnetkraft FMj die den Anker 5 gegen die Kraft Fo der Spreizfeder 6 und in gleicher Richtung wie die Kraft FU der schwächeren Ventilfeder 12 bewegt. Die Summe der wirksamen Federkräfte ist also um die Kraft der Ventilfeder 12 kleiner als die Kraft der Spreizfeder 6, wie aus dem 1. Teil der stark gezeichneten Kurve Fn hervorgeht. Wenn Ventilschließkörper 9 nach einem Hub A seinen Ventilsitz 10 erreicht, wird die Federkraft der Ventilfeder 12 vom Ventilsitz 10 aufgenommen. Nun wirkt am Anker 5 nur noch die Kraft der Spreizfeder 6 als Gegenkraft zur Magnetkraft. Die nun voll wirksame Federkraft der Spreizfeder 6 ist größer als die allmählich ansteigende Magnetkraft FM, d.h. im Diagramm liegt Fj, im 2. Teil der Kurve höher als die Magnetkraft FM. Das gilt auch unter Berücksichtigung der Bewegungsenergie des Ankers 5· Als Folge davon erreicht der Anker 5 nicht den Kern 4, er kann also dort nicht kleben bleiben. Die Spreizfeder 6 hält ihn gegen die Magnetkraft FM auf Abstand.When the current is switched on, a magnetic force FMj arises which moves the armature 5 against the force Fo of the expanding spring 6 and in the same direction as the force FU of the weaker valve spring 12. The sum of the effective spring forces is therefore smaller by the force of the valve spring 12 than the force of the expanding spring 6, as can be seen from the first part of the strongly drawn curve F n . When the valve closing body 9 reaches its valve seat 10 after a stroke A, the spring force of the valve spring 12 is absorbed by the valve seat 10. Now only the force of the expanding spring 6 acts on the armature 5 as a counterforce to the magnetic force. The now fully effective spring force of the expanding spring 6 is greater than the gradually increasing magnetic force FM, that is, in the diagram, Fj, in the 2nd part of the curve, is higher than the magnetic force FM. This also applies taking into account the kinetic energy of the armature 5. As a result, the armature 5 does not reach the core 4, so it cannot stick there. The expanding spring 6 keeps it at a distance against the magnetic force FM.

Besonders vorteilhaft anwendbar ist das Elektromagnetventil für sehr kleine Druckmitteldurchlässe, wo Anker mit nur wenigen mm Fläche und mit wenig Masse Verwendung finden. Kurze Schaltzeiten machen den Einsatz des Magnetventils bei Blockierschutzanlagen-besonders vorteilhaft»The solenoid valve can be used particularly advantageously for very small pressure medium passages where armatures with only a few mm area and with little mass can be used. Short switching times make the use of the solenoid valve especially advantageous for anti-lock systems »

-5--5-

609832/0549609832/0549

Claims (2)

AnsprücheExpectations RlJ Elektromagnetventil mit einer von Strom durchfließbaren Spule und mit einem zentrisch in der Spule angeordneten Ankerführungsrohr aus Messing od. dergl. nichtmagnetiserbarem Werkstoff, sowie mit einem beweglichen Anker und einem feststehenden Kern im Ankerführungsrohr, ferner mit einer Spreizfeder zwischen dem Kern und dem Anker und mit einem vom Anker über einen Stößel betätigbaren Ventil schließkörper dessen möglicher Schalthub kleiner ist als der mögliche Anzugshub des Ankers, und mit einer Einrichtung zur Verhinderung des magnetischen Klebens des Ankers am Kern, dadurch gekennzeichnet, daß die Kraft der vorgespannten Spreizfeder (6) größer ist als die Magnetkraft (FM) am Anker (5) nach dem Ende des Schalthubs des Ventils (9/10). RlJ solenoid valve with a coil through which current can flow and with an armature guide tube made of brass or similar non-magnetizable material arranged centrally in the coil, as well as with a movable armature and a fixed core in the armature guide tube, furthermore with a spreading spring between the core and the armature and with a valve closing body actuated by the armature via a plunger, the possible switching stroke of which is smaller than the possible tightening stroke of the armature, and a device for preventing the armature from sticking magnetically to the core, characterized in that the force of the pretensioned expansion spring (6) is greater than the magnetic force (FM) on the armature (5) after the end of the switching stroke of the valve (9/10). 2. Elektromagnetventil nach Anspruch 1 mit einem Ventilschließkörper, der vom Anker über den Stößel in Öffnungsrichtung und von einer Ventilfeder in Schließrichtung bewegbar ist, dadurch gekennzeichnet, daß die Federkraft (Fu) der Ventilfeder (12) kleiner ist als die Kraft der zwischen Anker (5) und Kern (4) angeordneten Spreizfeder (6). 2. Electromagnetic valve according to claim 1 with a valve closing body which is movable from the armature via the plunger in the opening direction and by a valve spring in the closing direction, characterized in that the spring force (Fu) of the valve spring (12) is smaller than the force between the armature ( 5) and core (4) arranged expanding spring (6). 609832/0 5 49609832/0 5 49 LeLe e r s e i t ee r e i t e
DE19752504521 1975-02-04 1975-02-04 Electromagnetically operated hydraulic valve - has residual air gap to prevent magnetic locking against return spring Pending DE2504521A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19752504521 DE2504521A1 (en) 1975-02-04 1975-02-04 Electromagnetically operated hydraulic valve - has residual air gap to prevent magnetic locking against return spring

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19752504521 DE2504521A1 (en) 1975-02-04 1975-02-04 Electromagnetically operated hydraulic valve - has residual air gap to prevent magnetic locking against return spring

Publications (1)

Publication Number Publication Date
DE2504521A1 true DE2504521A1 (en) 1976-08-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE19752504521 Pending DE2504521A1 (en) 1975-02-04 1975-02-04 Electromagnetically operated hydraulic valve - has residual air gap to prevent magnetic locking against return spring

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5730471U (en) * 1980-07-30 1982-02-17
WO1993020370A1 (en) * 1992-04-04 1993-10-14 Schrott, Harald Electromagnetic valve with low current consumption
WO1996017756A1 (en) * 1994-12-07 1996-06-13 Itt Industries, Inc. Electromagnetic solenoid valve for hydraulically actuated brake systems with slip control
EP1574770A1 (en) * 2004-03-10 2005-09-14 EATON Corporation Solenoid operated valve and method of making same
US7969705B2 (en) 2005-03-30 2011-06-28 Strattec Security Corporation Residual magnetic devices and methods
US8403124B2 (en) 2005-03-30 2013-03-26 Strattec Security Corporation Residual magnetic devices and methods
EP2236882A3 (en) * 2009-04-01 2013-11-06 FESTO AG & Co. KG Electromagnetic valve
DE102015220358A1 (en) * 2015-10-20 2017-04-20 Continental Teves Ag & Co. Ohg Solenoid valve

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5730471U (en) * 1980-07-30 1982-02-17
WO1993020370A1 (en) * 1992-04-04 1993-10-14 Schrott, Harald Electromagnetic valve with low current consumption
WO1996017756A1 (en) * 1994-12-07 1996-06-13 Itt Industries, Inc. Electromagnetic solenoid valve for hydraulically actuated brake systems with slip control
EP1574770A1 (en) * 2004-03-10 2005-09-14 EATON Corporation Solenoid operated valve and method of making same
US7051993B2 (en) 2004-03-10 2006-05-30 Eaton Corporation Solenoid operated valve and method of making same
CN100419318C (en) * 2004-03-10 2008-09-17 伊顿公司 Solenoid operated valve and method of making same
US7969705B2 (en) 2005-03-30 2011-06-28 Strattec Security Corporation Residual magnetic devices and methods
US8149557B2 (en) 2005-03-30 2012-04-03 Strattec Security Corporation Residual magnetic devices and methods
US8403124B2 (en) 2005-03-30 2013-03-26 Strattec Security Corporation Residual magnetic devices and methods
US10290411B2 (en) 2005-03-30 2019-05-14 Strattec Security Corporation Residual magnetic devices and methods
EP2236882A3 (en) * 2009-04-01 2013-11-06 FESTO AG & Co. KG Electromagnetic valve
DE102015220358A1 (en) * 2015-10-20 2017-04-20 Continental Teves Ag & Co. Ohg Solenoid valve

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