EP0438631B1 - Pneumatic activated central locking mechanism for a motor vehicle - Google Patents

Pneumatic activated central locking mechanism for a motor vehicle Download PDF

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Publication number
EP0438631B1
EP0438631B1 EP90115750A EP90115750A EP0438631B1 EP 0438631 B1 EP0438631 B1 EP 0438631B1 EP 90115750 A EP90115750 A EP 90115750A EP 90115750 A EP90115750 A EP 90115750A EP 0438631 B1 EP0438631 B1 EP 0438631B1
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EP
European Patent Office
Prior art keywords
valve
central locking
locking system
return line
check valve
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EP90115750A
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German (de)
French (fr)
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EP0438631A1 (en
Inventor
Richard Jurr
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Mannesmann VDO AG
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Mannesmann VDO AG
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    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B77/00—Vehicle locks characterised by special functions or purposes
    • E05B77/46—Locking several wings simultaneously
    • E05B77/50—Locking several wings simultaneously by pneumatic or hydraulic means

Definitions

  • the invention relates to a pneumatically operating central locking system intended for a motor vehicle with a vane cell pump driven by an electric motor, which has control devices for optionally building up a central locking pressure or a higher theft protection pressure and whose pump outlet is connected to pneumatic actuating elements of the locks to be locked.
  • Such central locking systems are provided in today's motor vehicles and are therefore generally known.
  • Conventional central locking systems have an anti-theft position in addition to the locking position, in which the door locks cannot be unlocked even by pulling up the door knobs.
  • To achieve the anti-theft position either the already existing pneumatic actuating element of the door lock is moved into a third position or an additional actuating element is provided, which at Reaching an anti-theft security pressure above the central locking pressure pushes a bolt into an actuating part.
  • the invention has for its object to provide a central locking system of the type mentioned in such a way that activation of the anti-theft device by people in the vehicle is largely excluded with the simplest possible means.
  • a return line leads from the pump outlet to a working chamber which is constantly separated from the pump outlet by at least one vane of the vane pump and that a check valve is arranged in this return line, which is in the open position when the ignition is switched on.
  • This configuration of the central locking system ensures that when the ignition is switched on, the vane pump cannot generate such a high pressure that the anti-theft device must be activated. Only when the ignition key is pulled out of the ignition lock, which normally occurs when leaving the vehicle, does the shut-off valve close the return line, so that the full pump pressure can then be built up and the anti-theft position can be achieved. There with open check valve the pump outlet is connected to a working chamber, the pump works in this valve position with a lower power requirement corresponding to the reduced pressure, so that the energy consumption of the electric motor of the pump is reduced accordingly.
  • the arrangement with the return line according to the invention is thus more advantageous than if pressure were blown off from the pump outlet to the atmosphere, since then even with only a reduced pressure requirement, the energy expenditure is required for the full pressure requirement. Blow-off noises are also avoided by the invention. Since the central locking system according to the invention does not require an atmospheric connection for the different pressure build-up, the ingress of dirt is excluded.
  • check valve is also in an AND operation with the electric motor of the vane pump, so that the check valve is only in the open position when the ignition is switched on and the electric motor is running.
  • This AND connection ensures that the check valve is not energized when the ignition is switched on, but only when the central locking system is brought into the locked position. This prevents the check valve from being constantly under voltage while the motor vehicle is in use.
  • a commercially available valve can be used as a shut-off valve if it is a 2/2-way valve that can be actuated magnetically against the force of a spring.
  • the pressure at the pump outlet that occurs when the shut-off valve is open can also be kept at a constant value with different on-board voltages as a result of a different state of charge of the vehicle battery or as a result of different outside temperatures if a return valve that automatically releases the return line at a specified pressure is arranged in the return line.
  • the central locking pressure can be set to an exact value if, according to another embodiment of the invention, the switching valve is adjustable in terms of its switching point.
  • connection valve consists in the connection valve having a diaphragm which is biased by a valve spring against a valve seat and which is acted upon by the pressure in the return line in an open position releasing the valve seat.
  • connection valve can be made adjustable in a simple manner if the spring is supported against an adjusting screw.
  • the set screw is also the atmospheric connection of the connection valve if the set screw is a hollow screw which connects a valve chamber with the atmosphere, which is provided on the side of the membrane facing away from the valve seat.
  • connection valve is never subjected to the full pressure required to reach the locking position if the connection valve is arranged behind the check valve as seen from the pump outlet. In this way, an undesired overexpansion of the membrane of the connection valve is excluded.
  • a very simple embodiment of the shut-off valve consists in that it has a bimetal part surrounded by a heating winding with a closing body which bears against a valve seat when the bimetal part is cold.
  • the heating winding can be energized in exactly the same way as the solenoid valve already mentioned, which forms the check valve, so that this takes place inevitably when the ignition is switched on and the electric motor of the vane pump is running.
  • the heating winding is a PTC thermistor. This ensures that initially a high heating current flows, so that the bimetallic part heats up quickly and therefore switches quickly enough even when pressure builds up rapidly.
  • the central locking system is particularly cost-effective if the return line with the shut-off valve and the connecting valve are arranged in a common housing with the vane pump.
  • FIG. 1 shows a vane pump 1 which can be driven by an electric motor 2.
  • the vane pump 1 has a pump outlet 3, which is connected via a line 4 to a pneumatic control element 5, which is used for central locking and theft protection of a door lock, not shown. If a central locking pressure is built up with the vane pump 1, the actuating element 5 moves into a locking position. If the pressure is increased up to an anti-theft security pressure, the actuating element 5 moves beyond the locking position into an anti-theft security position.
  • a return line 6 branches off from line 4 and leads back into a working chamber 7 of vane pump 1.
  • This working chamber 7 is separated by a wing 8 from the pump outlet 3 and by a wing 9 from a pump inlet 10.
  • a check valve 11 is connected, which is a 2/2-way valve that is magnetically adjustable against the force of a spring 12.
  • This check valve 11 is connected via an AND link on the one hand to the terminal 15 of the motor vehicle and on the other hand to a central locking relay 13.
  • FIG. 2 shows a vane pump 1, which has in its housing 14 a check valve 11 which has been modified compared to FIG. 1 and additionally has a cut-in valve 15.
  • the rotor 16 of the vane pump 1 with its vanes 8, 9, 17, 18 is also shown in FIG. 2. By rotating clockwise, the rotor 16 conveys air from the pump inlet 10 to the pump outlet 3.
  • the return line 6 branches inside the housing 14 from the pump outlet 3 and leads via the shut-off valve 11 and the connecting valve 15 into the working chamber 7.
  • the check valve 11 has a bimetallic part 19 clamped on one side, at the free end of which a closing member 20 is provided which blocks a valve seat 21 in the position shown, so that the return line 6 is shut off.
  • the bimetal part 19 is surrounded by a heating winding 22, which can be a PTC thermistor.
  • a PTC element can also be connected upstream of the heating conductor, so that the heating winding need not be a PTC thermistor. If this is energized, the bimetal part 19 heats up, as seen in the drawing, bends to the right, so that the closing member 2 lifts off the valve seat 21.
  • the connecting valve 15 has a membrane 23 which is biased by a valve spring 24 against a valve seat 25 and which delimits a valve chamber 26 into which the return line 6 opens.
  • the valve spring 24 is supported upwards against an adjusting screw 27 designed as a hollow screw, with which its spring tension can be adjusted.
  • the diaphragm 23 lifts off the valve seat 25 and thereby connects the pump outlet 3 to the working chamber 7, which prevents a further increase in pressure or leads to a reduction in pressure to a defined value if the shut-off valve 11 at the pump outlet 3 is opened there is a pressure above the central locking pressure.

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  • Lock And Its Accessories (AREA)
  • Preventing Unauthorised Actuation Of Valves (AREA)

Description

Die Erfindung bezieht sich auf eine für ein Kraftfahrzeug bestimmte, pneumatisch arbeitende Zentralverriegelungsanlage mit einer von einem Elektromotor angetriebenen Flügelzellenpumpe, welche Steuereinrichtungen zum wahlweisen Aufbau eines Zentralverriegelungsdruckes oder eines höher gelegenen Diebstahlsicherungsdruckes auweist und dessen Pumpenauslaß mit pneumatischen Stellelementen der zu verriegelnden Schlösser verbunden ist. Solche Zentralverriegelungsanlagen sind in heutigen Kraftfahrzeugen vorgesehen und deshalb allgemein bekannt.The invention relates to a pneumatically operating central locking system intended for a motor vehicle with a vane cell pump driven by an electric motor, which has control devices for optionally building up a central locking pressure or a higher theft protection pressure and whose pump outlet is connected to pneumatic actuating elements of the locks to be locked. Such central locking systems are provided in today's motor vehicles and are therefore generally known.

Übliche Zentralverriegelungsanlagen haben zusätzlich zur Verriegelungsstellung eine Diebstahlsicherungsstellung, in der die Türschlösser auch durch Hochziehen der Türknöpfe nicht entriegelt werden können. Zum Erreichen der Diebstahlsicherungsstellung wird entweder das ohnehin vorhandene pneumatische Betätigungselement des Türschlosses in eine dritte Stellung bewegt oder aber es wird ein zusätzliches Betätigungselement vorgesehen, welches bei Erreichen eines oberhalb des Zentralverriegelungsdruckes liegenden Diebstahlsicherungsdruckes einen Riegel in ein Betätigungsteil schiebt. Bei solchen Zentralverriegelungsanlagen sollte verhindert werden, daß im Fahrzeug sitzende Personen von innen die Diebstahlsicherung aktivieren können, weil bei einem anschließenden Versagen der Zentralverriegelungsanlage das Fahrzeug nicht mehr von innen zu öffnen wäre. Wenn das Versagen beispielsweise durch einen elektrischen Kurzschluß hervorgerufen wird, wären motorisch zu öffnende Fenster ebenfalls nicht mehr zu betätigen, so daß man nicht durch ein Fenster greifen und das Türschloß mit dem Schlüssel von außen öffnen könnte.Conventional central locking systems have an anti-theft position in addition to the locking position, in which the door locks cannot be unlocked even by pulling up the door knobs. To achieve the anti-theft position, either the already existing pneumatic actuating element of the door lock is moved into a third position or an additional actuating element is provided, which at Reaching an anti-theft security pressure above the central locking pressure pushes a bolt into an actuating part. In such central locking systems, it should be prevented that people sitting in the vehicle can activate the anti-theft device from the inside, because if the central locking system subsequently fails, the vehicle could no longer be opened from the inside. If the failure is caused, for example, by an electrical short circuit, motorized windows could also no longer be operated, so that one could not reach through a window and open the door lock with the key from the outside.

Der Erfindung liegt die Aufgabe zugrunde, eine Zentralverriegelungsanlage der eingangs genannten Art so auszubilden, daß mit möglichst einfachen Mitteln eine Aktivierung der Diebstahlsicherung durch im Fahrzeug befindliche Personen weitgehend ausgeschlossen ist.The invention has for its object to provide a central locking system of the type mentioned in such a way that activation of the anti-theft device by people in the vehicle is largely excluded with the simplest possible means.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß vom Pumpenauslaß eine Rückführleitung zu einer vom Pumpenauslaß ständig durch zumindest einen Flügel der Flügelzellenpumpe getrennten Arbeitskammer führt und daß in dieser Rückführleitung ein Sperrventil angeordnet ist, welches sich bei eingeschalteter Zündung in Offenstellung befindet.This object is achieved in that a return line leads from the pump outlet to a working chamber which is constantly separated from the pump outlet by at least one vane of the vane pump and that a check valve is arranged in this return line, which is in the open position when the ignition is switched on.

Durch diese Ausbildung der Zentralverriegelungsanlage wird erreicht, daß bei eingeschalteter Zündung die Flügelzellenpumpe keinen so hohen Druck erzeugen kann, daß die Diebstahlsicherung zu aktivieren ist. Erst wenn der Zündschlüssel aus dem Zündschloß herausgezogen ist, was normalerweise beim Verlassen des Fahrzeugs erfolgt, schließt das Sperrventil die Rückführleitung, so daß dann der volle Pumpendruck aufgebaut und dadurch die Diebstahlsicherungsstellung erreicht werden kann. Da bei geöffnetem Sperrventil der Pumpenauslaß mit einer Arbeitskammer verbunden ist, arbeitet die Pumpe in dieser Ventilstellung mit einem entsprechend des herabgesetzten Druckes geringeren Leistungsbedarf, so daß der Energieverbrauch des Elektromotors der Pumpe entsprechend herabgesetzt ist. Die Anordnung mit der erfindungsgemäßen Rückführleitung ist somit vorteilhafter, als wenn Druck vom Pumpenauslaß zur Atmosphäre hin abgeblasen würde, da dann auch bei einem nur verminderten Druckbedarf der Energieaufwand für den vollen Druckbedarf erforderlich wird. Weiterhin werden durch die Erfindung Abblasgeräusche vermieden. Da die erfindungsgemäße Zentralverriegelungsanlage für den unterschiedlichen Druckaufbau keine Atmosphärenverbindung benötigt, wird ein Eindringen von Schmutz ausgeschlossen.This configuration of the central locking system ensures that when the ignition is switched on, the vane pump cannot generate such a high pressure that the anti-theft device must be activated. Only when the ignition key is pulled out of the ignition lock, which normally occurs when leaving the vehicle, does the shut-off valve close the return line, so that the full pump pressure can then be built up and the anti-theft position can be achieved. There with open check valve the pump outlet is connected to a working chamber, the pump works in this valve position with a lower power requirement corresponding to the reduced pressure, so that the energy consumption of the electric motor of the pump is reduced accordingly. The arrangement with the return line according to the invention is thus more advantageous than if pressure were blown off from the pump outlet to the atmosphere, since then even with only a reduced pressure requirement, the energy expenditure is required for the full pressure requirement. Blow-off noises are also avoided by the invention. Since the central locking system according to the invention does not require an atmospheric connection for the different pressure build-up, the ingress of dirt is excluded.

Eine vorteilhafte Ausgestaltung der Erfindung besteht darin, daß sich das Sperrventil zusätzlich mit dem Elektromotor der Flügelzellenpumpe in einer Und-Verknüpfung befindet, so daß das Sperrventil sich nur bei eingeschalteter Zündung und gleichzeitig laufendem Elektromotor in Offenstellung befindet. Durch diese Und-Verknüpfung wird erreicht, daß das Sperrventil nicht bereits beim Einschalten der Zündung bestromt wird, sondern erst dann, wenn die Zentralverriegelungsanlage in Verriegelungsstellung gebracht ist. Dadurch wird verhindert, daß das Sperrventil während der Benutzung des Kraftfahrzeugs ständig unter Spannung steht.An advantageous embodiment of the invention is that the check valve is also in an AND operation with the electric motor of the vane pump, so that the check valve is only in the open position when the ignition is switched on and the electric motor is running. This AND connection ensures that the check valve is not energized when the ignition is switched on, but only when the central locking system is brought into the locked position. This prevents the check valve from being constantly under voltage while the motor vehicle is in use.

Als Sperrventil kann ein handelsübliches Ventil verwendet werden, wenn es sich bei ihm um ein magnetisch gegen die Kraft einer Feder betätigbares 2/2-Wegeventil handelt.A commercially available valve can be used as a shut-off valve if it is a 2/2-way valve that can be actuated magnetically against the force of a spring.

Der bei geöffnetem Sperrventil sich einstellende Druck am Pumpenauslaß kann auch bei unterschiedlicher Bordspannung infolge eines unterschiedlichen Ladezustandes der Fahrzeugbatterie oder infolge von unterschiedlichen Außentemperaturen auf einen konstanten Wert gehalten werden, wenn in der Rückführleitung ein die Rückführleitung bei einem festgelegten Druck selbsttätig freigebendes Zuschaltvenil angeordnet ist.The pressure at the pump outlet that occurs when the shut-off valve is open can also be kept at a constant value with different on-board voltages as a result of a different state of charge of the vehicle battery or as a result of different outside temperatures if a return valve that automatically releases the return line at a specified pressure is arranged in the return line.

Der Zentralverriegelungsdruck kann auf einen genauen Wert eingestellt werden, wenn gemäß einer anderen Ausgestaltung der Erfindung das Zuschaltventil hinsichtlich seines Schaltpunktes einstellbar ausgebildet ist.The central locking pressure can be set to an exact value if, according to another embodiment of the invention, the switching valve is adjustable in terms of its switching point.

Eine besonders einfache Ausführungsform des Zuschaltventils besteht darin, daß das Zuschaltventil eine von einer Ventilfeder gegen einen Ventilsitz vorgespannte Membran hat, welche vom Druck in der Rückführleitung in eine den Ventilsitz freigebende Offenstellung beaufschlagt ist.A particularly simple embodiment of the connection valve consists in the connection valve having a diaphragm which is biased by a valve spring against a valve seat and which is acted upon by the pressure in the return line in an open position releasing the valve seat.

Dieses Zuschaltventil kann auf einfache Weise einstellbar gemacht werden, wenn die Feder gegen eine Stellschraube abgestützt ist.This connection valve can be made adjustable in a simple manner if the spring is supported against an adjusting screw.

Die Stellschraube ist zugleich die Atmosphärenverbindung des Zuschaltventils, wenn die Stellschraube eine Hohlschraube ist, welche einen Ventilraum mit der Atmosphäre verbindet, der auf der dem Ventilsitz abgewandten Seite der Membran vorgesehen ist.The set screw is also the atmospheric connection of the connection valve if the set screw is a hollow screw which connects a valve chamber with the atmosphere, which is provided on the side of the membrane facing away from the valve seat.

Das Zuschaltventil wird niemals mit dem vollen, zum Erreichen der Verriegelungsstellung erforderlichen Druck beaufschlagt, wenn das Zuschaltventil vom Pumpenauslaß aus gesehen hinter dem Sperrventil angeordnet ist. Hierdurch wird eine unerwünschte Überdehnung der Membran des Zuschaltventiles ausgeschlossen.The connection valve is never subjected to the full pressure required to reach the locking position if the connection valve is arranged behind the check valve as seen from the pump outlet. In this way, an undesired overexpansion of the membrane of the connection valve is excluded.

Eine sehr einfache Ausführungsform des Sperrventils besteht darin, daß es ein von einer Heizwicklung umgebenes Bimetallteil mit einem bei kaltem Bimetallteil gegen einen Ventilsitz anliegenden Schließkörper hat. Die Bestromung der Heizwicklung kann genau wie die des bereits genannten, das Sperrventil bildenden Magnetventils erfolgen, so daß diese bei eingeschalteter Zündung und laufendem Elektromotor der Flügelzellenpumpe zwangsläufig erfolgt.A very simple embodiment of the shut-off valve consists in that it has a bimetal part surrounded by a heating winding with a closing body which bears against a valve seat when the bimetal part is cold. The heating winding can be energized in exactly the same way as the solenoid valve already mentioned, which forms the check valve, so that this takes place inevitably when the ignition is switched on and the electric motor of the vane pump is running.

Von Vorteil ist es auch, wenn die Heizwicklung ein Kaltleiter ist. Dadurch wird erreicht, daß anfangs ein hoher Heizstrom fließt, so daß sich das Bimetallteil rasch erwärmt und deshalb auch bei einem raschen Druckaufbau rasch genug schaltet.It is also an advantage if the heating winding is a PTC thermistor. This ensures that initially a high heating current flows, so that the bimetallic part heats up quickly and therefore switches quickly enough even when pressure builds up rapidly.

Besonders kostengünstig ist die Zentralverriegelungsanlage gestaltet, wenn die Rückführleitung mit dem Sperrventil und dem Zuschaltventil in einem gemeinsamen Gehäuse mit der Flügelzellenpumpe angeordnet sind.The central locking system is particularly cost-effective if the return line with the shut-off valve and the connecting valve are arranged in a common housing with the vane pump.

Die Erfindung läßt zahlreiche Ausführungsformen zu. Zur weiteren Verdeutlichung ihres Grundprinzips sind zwei davon in der Zeichnung dargestellt und werden nachfolgend beschrieben. In ihr zeigen die

Fig. 1
eine Prinzipskizze der erfindungsgemäßen Zentralverriegelungsanlage,
Fig. 2
einen Querschnitt durch eine Flügelzellenpumpe mit den für die Erfindung notwendigen Bauteilen.
The invention allows numerous embodiments. To further clarify its basic principle, two of them are shown in the drawing and are described below. They show in her
Fig. 1
a schematic diagram of the central locking system according to the invention,
Fig. 2
a cross section through a vane pump with the components necessary for the invention.

In der Figur 1 ist eine Flügelzellenpumpe 1 dargestellt, welche von einem Elektromotor 2 antreibbar ist. Die Flügelzellenpumpe 1 hat einen Pumpenauslaß 3, der über eine Leitung 4 mit einem pneumatischen Stellelement 5 verbunden ist, welches zur Zentralverriegelung und Diebstahlsicherung eines nicht gezeigten Türschlosses dient. Wird mit der Flügelzellenpumpe 1 ein Zentralverriegelungsdruck aufgebaut, so gelangt das Stellelement 5 in eine Verriegelungsstellung. Wird der Druck bis zu einem Diebstahlsicherungsdruck erhöht, so bewegt sich das Stellelement 5 über die Verriegelungsstellung hinaus in eine Diebstahlsicherungsstellung.FIG. 1 shows a vane pump 1 which can be driven by an electric motor 2. The vane pump 1 has a pump outlet 3, which is connected via a line 4 to a pneumatic control element 5, which is used for central locking and theft protection of a door lock, not shown. If a central locking pressure is built up with the vane pump 1, the actuating element 5 moves into a locking position. If the pressure is increased up to an anti-theft security pressure, the actuating element 5 moves beyond the locking position into an anti-theft security position.

Von der Leitung 4 zweigt eine Rückführleitung 6 ab, die zurück in eine Arbeitskammer 7 der Flügelzellenpumpe 1 führt. Diese Arbeitskammer 7 ist durch einen Flügel 8 vom Pumpenauslaß 3 und durch einen Flügel 9 von einem Pumpeneinlaß 10 getrennt. In der Rückführleitung 6 ist ein Sperrventil 11 geschaltet, bei dem es sich um ein magnetisch gegen die Kraft einer Feder 12 verstellbares 2/2-Wegeventil handelt. Dieses Sperrventil 11 ist über eine Und-Verknüpfung einerseits mit der Klemme 15 des Kraftfahrzeugs, andererseits mit einem Zentralverriegelungsrelais 13 verbunden.A return line 6 branches off from line 4 and leads back into a working chamber 7 of vane pump 1. This working chamber 7 is separated by a wing 8 from the pump outlet 3 and by a wing 9 from a pump inlet 10. In the return line 6, a check valve 11 is connected, which is a 2/2-way valve that is magnetically adjustable against the force of a spring 12. This check valve 11 is connected via an AND link on the one hand to the terminal 15 of the motor vehicle and on the other hand to a central locking relay 13.

Ist die Zündung eingeschaltet, steht an der Klemme KL15 Spannung an. Wird dann das Zentralverriegelungsrelais 13 betätigt, so läuft der Elektromotor 2 an, so daß dadurch die Flügelzellenpumpe 1 zu arbeiten beginnt. Das Sperrventil 11 schaltet bei Betätigung des Zentralverriegelungsrelais 13 und eingeschalteter Zündung sofort in seine Offenstellung. Dadurch ist eine offene Druckverbindung vom Pumpenauslaß 3 zur Arbeitskammer 7 geschaffen, wodurch die Flügelzellenpumpe 1 nur einen gegenüber ihrem maximal möglichen Druck herabgesetzten Druck erzeugen kann. Dieser reicht nur zur Zentralverriegelung, nicht aber zur Diebstahlsicherung aus. Eine Diebstahlsicherung ist erst möglich, wenn der Zündschlüssel aus dem Zündschloß gezogen ist und deshalb an der Klemme 15 keine Spannung mehr ansteht, weil dann das Sperrventil 11 in Sperrstellung verbleibt und deshalb die Rückführleitung 6 gesperrt ist.If the ignition is switched on, voltage is present at terminal KL15. If the central locking relay 13 is then actuated, the electric motor 2 starts, so that the vane pump 1 begins to work. The shut-off valve 11 switches to its open position immediately when the central locking relay 13 is actuated and the ignition is switched on. This creates an open pressure connection from the pump outlet 3 to the working chamber 7, as a result of which the vane pump 1 can only produce a pressure which is reduced compared to its maximum possible pressure. This is only sufficient for central locking, but not for theft protection. An anti-theft device is only possible when the ignition key is pulled out of the ignition lock and therefore there is no longer any voltage at terminal 15, because then the check valve 11 remains in the locked position and therefore the return line 6 is blocked.

Die Figur 2 zeigt eine Flügelzellenpumpe 1, welche in ihrem Gehäuse 14 ein gegenüber Figur 1 geändertes Sperrventil 11 und zusätzlich ein Zuschaltventil 15 hat. Dargestellt ist in Figur 2 weiterhin der Rotor 16 der Flügelzellenpumpe 1 mit seinen Flügeln 8, 9, 17, 18. Durch Drehung im Uhrzeigersinn fördert der Rotor 16 Luft vom Pumpeneinlaß 10 zum Pumpenauslaß 3. Die Rückführleitung 6 zweigt innerhalb des Gehäuses 14 vom Pumpenauslaß 3 ab und führt über das Sperrventil 11 und das Zuschaltventil 15 in die Arbeitskammer 7.FIG. 2 shows a vane pump 1, which has in its housing 14 a check valve 11 which has been modified compared to FIG. 1 and additionally has a cut-in valve 15. The rotor 16 of the vane pump 1 with its vanes 8, 9, 17, 18 is also shown in FIG. 2. By rotating clockwise, the rotor 16 conveys air from the pump inlet 10 to the pump outlet 3. The return line 6 branches inside the housing 14 from the pump outlet 3 and leads via the shut-off valve 11 and the connecting valve 15 into the working chamber 7.

Das Sperrventil 11 hat ein einseitig eingespanntes Bimetallteil 19, an dessen freiem Ende ein Schließglied 20 vorgesehen ist, welches in der dargestellten Stellung einen Ventilsitz 21 versperrt, so daß die Rückführleitung 6 abgesperrt ist. Das Bimetallteil 19 ist von einer Heizwicklung 22 umgeben, bei der es sich um einen Kaltleiter handeln kann. Dem Heizleiter kann auch ein PTC-Element vorgeschaltet sein, so daß die Heizwicklung kein Kaltleiter sei muß. Wird diese bestromt, dann erwärmt sich das Bimetallteil 19, biegt sich in der Zeichnung gesehen nach rechts, so daß das Schließglied 2 vom Ventilsitz 21 abhebt.The check valve 11 has a bimetallic part 19 clamped on one side, at the free end of which a closing member 20 is provided which blocks a valve seat 21 in the position shown, so that the return line 6 is shut off. The bimetal part 19 is surrounded by a heating winding 22, which can be a PTC thermistor. A PTC element can also be connected upstream of the heating conductor, so that the heating winding need not be a PTC thermistor. If this is energized, the bimetal part 19 heats up, as seen in the drawing, bends to the right, so that the closing member 2 lifts off the valve seat 21.

Das Zuschaltventil 15 hat eine Membran 23, welche von einer Ventilfeder 24 gegen einen Ventilsitz 25 vorgespannt ist und die eine Ventilkammer 26 begrenzt, in die die Rückführleitung 6 mündet. Die Ventilfeder 24 stützt sich nach oben hin gegen eine als Hohlschraube ausgebildete Stellschraube 27 ab, mit der ihre Federspannung eingestellt werden kann. Hat der Druck in der Rückführleitung 6 einen festgelegten Wert erreicht, dann hebt die Membran 23 vom Ventilsitz 25 ab und verbindet dadurch den Pumpenauslaß 3 mit der Arbeitskammer 7, was einen weiteren Druckanstieg verhindert oder zu einem Druckabbau auf einen festgelegten Wert führt, falls beim öffnen des Sperrventils 11 am Pumpenauslaß 3 ein über dem Zentralverriegelungsdruck liegender Druck ansteht.The connecting valve 15 has a membrane 23 which is biased by a valve spring 24 against a valve seat 25 and which delimits a valve chamber 26 into which the return line 6 opens. The valve spring 24 is supported upwards against an adjusting screw 27 designed as a hollow screw, with which its spring tension can be adjusted. Has the pressure in the return line? 6 reaches a defined value, then the diaphragm 23 lifts off the valve seat 25 and thereby connects the pump outlet 3 to the working chamber 7, which prevents a further increase in pressure or leads to a reduction in pressure to a defined value if the shut-off valve 11 at the pump outlet 3 is opened there is a pressure above the central locking pressure.

Claims (12)

  1. Pneumatically operating central locking system designed for a motor vehicle, having a vane pump (1) driven by an electric motor (2) and incorporating control devices for setting up, as required, a central locking pressure or a higher anti-theft pressure, and the pump outlet (3) of which is connected to pneumatic final control elements (5) of the locks to be latched, characterised in that from the pump outlet (3) a return line (6) runs to a working chamber (7) permanently separated from the pump outlet (3) by a least one vane (8) of the vane pump, and that arranged in this return line (6) is a check valve (11) which is in the open position when the ignition is switched on.
  2. Central locking system according to claim 1, characterised in that the check valve (11) is additionally in an AND relation with the electric motor (2) of the vane pump (1), with the result that the check valve (11) is only in the open position when the ignition is switched on and the electric motor (2) simultaneously running.
  3. Central locking system according to claims 1 or 2, characterised in that the check valve (11) is a 2/2-way valve operated magnetically against the force of a spring (12).
  4. Central locking system according to at least one of the preceding claims, characterised in that arranged in the return line (6) is an emergency valve (15) which automatically clears the return line (6) at a defined pressure.
  5. Central locking system according to claim 4, characterised in that the changeover point of the emergency valve (15) is designed to be adjustable.
  6. Central locking system according to claims 4 or 5, characterised in that the emergency valve (15) has a diaphragm (23) pretensioned by a valve spring (24) against a valve seat (25) and actuated by the pressure in the return line (6) into an open position which clears the valve seat (25).
  7. Central locking system according to claim 6, characterised in that the valve spring (24) rests against an adjustable screw (27).
  8. Central locking system according to claim 7, characterised in that the adjustable screw (27) is a hollow bolt connecting with the atmosphere a valve compartment provided on the side of the diaphragm (23) remote from the valve seat (25).
  9. Central locking system according to at least one of the preceding claims, characterised in that the emergency valve (15) is arranged behind the check valve (11) when viewed from the pump outlet (3).
  10. Central locking system according to at least one of the preceding claims, characterised in that the check valve (11) has a bimetal part (19) surrounded by a heating coil (22) and having a closure member which bears against a valve seat (21) when the bimetal part (19) is cold.
  11. Central locking system according to claim 10, characterised in that the heating coil (22) is a PTC thermistor.
  12. Central locking system according to at least one of the preceding claims, characterised in that the return line (6) along with the check valve (11) and the emergency valve (15) are arranged in a common casing (14) with the vane pump (1).
EP90115750A 1990-01-25 1990-08-17 Pneumatic activated central locking mechanism for a motor vehicle Expired - Lifetime EP0438631B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4002137 1990-01-25
DE4002137A DE4002137A1 (en) 1990-01-25 1990-01-25 FOR A MOTOR VEHICLE INTENDED, PNEUMATICALLY WORKING CENTRAL LOCKING SYSTEM

Publications (2)

Publication Number Publication Date
EP0438631A1 EP0438631A1 (en) 1991-07-31
EP0438631B1 true EP0438631B1 (en) 1993-09-15

Family

ID=6398756

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90115750A Expired - Lifetime EP0438631B1 (en) 1990-01-25 1990-08-17 Pneumatic activated central locking mechanism for a motor vehicle

Country Status (2)

Country Link
EP (1) EP0438631B1 (en)
DE (2) DE4002137A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3121666A1 (en) * 1981-05-30 1982-12-16 Ibm Deutschland Gmbh, 7000 Stuttgart METHOD AND DEVICE FOR THE MUTUAL ALIGNMENT OF OBJECTS IN X-RAY AND CARPULAR RAY EXPOSURE PROCESSES

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3710347A1 (en) * 1987-03-28 1988-10-06 Vdo Schindling LOCKING DEVICE

Also Published As

Publication number Publication date
EP0438631A1 (en) 1991-07-31
DE59002744D1 (en) 1993-10-21
DE4002137A1 (en) 1991-08-01

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