WO1999039956A1 - Actuation device for an electronically regulated brake actuation system - Google Patents

Actuation device for an electronically regulated brake actuation system Download PDF

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Publication number
WO1999039956A1
WO1999039956A1 PCT/EP1999/000693 EP9900693W WO9939956A1 WO 1999039956 A1 WO1999039956 A1 WO 1999039956A1 EP 9900693 W EP9900693 W EP 9900693W WO 9939956 A1 WO9939956 A1 WO 9939956A1
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WO
WIPO (PCT)
Prior art keywords
simulator
actuating
bellows
pressure
pressure generator
Prior art date
Application number
PCT/EP1999/000693
Other languages
German (de)
French (fr)
Inventor
Ronald Bayer
Manfred Rüffer
Ulrich Neumann
Andreas Klein
Johann Jungbecker
Bernhard Schmittner
Christian Albrich Von Albrichsfeld
Original Assignee
Continental Teves Ag & Co. Ohg
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
Priority claimed from DE19822411A external-priority patent/DE19822411A1/en
Application filed by Continental Teves Ag & Co. Ohg filed Critical Continental Teves Ag & Co. Ohg
Publication of WO1999039956A1 publication Critical patent/WO1999039956A1/en

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Classifications

    • 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
    • B60T8/40—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 comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking
    • B60T8/4081—Systems with stroke simulating devices for driver input
    • 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
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/16—Master control, e.g. master cylinders
    • B60T11/20—Tandem, side-by-side, or other multiple master cylinder units
    • 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
    • B60T7/00—Brake-action initiating means
    • B60T7/02—Brake-action initiating means for personal initiation
    • B60T7/04—Brake-action initiating means for personal initiation foot actuated
    • B60T7/042—Brake-action initiating means for personal initiation foot actuated by electrical means, e.g. using travel or force sensors

Definitions

  • the invention relates to an actuating device for an electronically controllable braking system for motor vehicles, which consists of a pressure sensor which can be actuated by means of an actuating pedal and a simulator which interacts with the pressure sensor.
  • an emergency function In a brake system of this type, a distinction must be made between normal operation and operation without a servo function, hereinafter referred to as an emergency function, as occurs, for example, if the electronics fail.
  • Such an actuator is e.g. known from international patent application WO 95/28307.
  • the simulator of the known actuator the pressure transmitter is designed as a tandem master cylinder, is formed in the master cylinder housing and consists essentially of a simulator chamber, which is delimited by a simulator piston and is formed as part of a master cylinder pressure chamber.
  • the simulator piston which is pretensioned by means of a simulator spring, is preferably guided in a master cylinder piston and delimits a hydraulic chamber therein which is connected to a pressure-free pressure medium reservoir associated with the tandem master cylinder.
  • the pretension of the simulator spring which is required to return the master cylinder piston or pistons to their starting position and which has a discontinuity in the pedal characteristic, is less advantageous in the known actuating device
  • the simulator is formed by a friction-free metallic bellows which can be acted upon by the hydraulic pressure input into the pressure transmitter, the interior of which accommodates the simulator spring and can be connected to an unpressurized pressure medium reservoir.
  • the simulator spring which has a progressive force-displacement characteristic, is preferably arranged in the bellows free of prestress.
  • a significant improvement in the pedal feel is achieved in an advantageous embodiment of the actuating device according to the invention in that a cover is inserted in the connection between the interior of the bellows and the pressure medium reservoir.
  • the cover which is advantageously inside the folding - 3 -
  • the tenbalges can be arranged, is designed as a variable orifice, the flow cross-section of which depends on the actuation pedal travel and the approach speed.
  • the above-mentioned dependency is achieved in that the diaphragm is formed by a diaphragm pin which can be displaced in a bore and has a variable cross section.
  • a further advantageous embodiment of the subject matter of the invention provides that the connection between the interior of the bellows and the pressure medium reservoir can be shut off by means of a valve device.
  • a valve device This measure ensures that the simulator can no longer absorb any pressure medium volume in an emergency, in which the brake pressure is built up for the purpose of braking by actuating the pressure generator.
  • Shutting off the hydraulic connection mentioned above results in improved pedal behavior (harder pedal, shorter pedal travel) in the event of a system failure.
  • the valve device can be actuated mechanically, preferably by the actuating movement of a pressure sensor piston.
  • the pressure transmitter is designed as a tandem master cylinder and the valve device is actuated by the secondary piston of the tandem master cylinder, for example by means of a rotatably mounted two-armed lever.
  • the actuating device shown in the drawing consists essentially of a two-circuit pressure generator or tandem master cylinder 2 which can be actuated by means of an actuating pedal 1 and which has pressure chambers 5, 6 which are delimited and separated from one another by two pistons 3, 4 and which are connected to an unpressurized pressure medium reservoir 7 .
  • Hydraulic wheel brakes (not shown) associated with the vehicle axles are connected to the two pressure chambers (primary pressure chamber 5, secondary pressure chamber 6) by means of lockable hydraulic connections 8, 9.
  • the pistons 3, 4 in the housing 10 of the tandem master cylinder 2 delimit trailing spaces 11, 12, which on the one hand have central valves 13, 14 arranged in the pistons 3, 4 with the associated pressure spaces 5, 6 and on the other hand have channels 28, 29 formed in the main cylinder housing 10 are in connection with the pressure medium reservoir 7.
  • a hydraulic chamber 16 is connected to the first or primary pressure chamber 5, which receives a metallic bellows 17, which forms a boundary of the chamber 16, so that it with the in the primary pressure chamber 5 by pressing the pedal 1 controlled pressure can be applied.
  • the bellows 17 forms, together with a simulator spring 18 arranged in its interior, a pedal simulator 15 which, when shut off 5 -
  • a sleeve-shaped part 21 is arranged in the interior of the bellows 17, which has an opening 22.
  • the opening 22 forms, together with an insertable pin 23 with a variable cross section, which can be inserted into the opening 22 and is connected to the bellows 17, and serves as a damping element.
  • a hydraulic channel 24 opens, which is connected to the pressure medium reservoir 7 via the trailing space 12 of the secondary pressure space 6.
  • a valve device 25 inserted into the channel 24 enables the fluidic connection between the interior 19 of the bellows 17 and the pressure medium reservoir 7 to be shut off, so that the pedal simulator 15 has the emergency braking function, in which a hydraulic pressure in the wheel brakes, not shown, of the vehicle by shifting the Master cylinder piston 3, 4 is built up, can no longer accommodate pressure medium volume. It is particularly useful if the valve device 25 is actuated mechanically by the movement of the secondary piston 4. For this purpose, a rotatably mounted two-armed lever 26 is provided, which on the one hand abuts a closing member 27 of the valve device 25 and on the other hand interacts with the secondary piston 4. A valve spring 28 biasing the closing member 27 in the closing direction of the valve device 25 ensures that the lever 26 bears against the secondary piston 4 without play.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Regulating Braking Force (AREA)

Abstract

The invention relates to an actuation unit for an electronically regulated braking system for automobiles. The inventive actuation unit consists of a pressure generator which is actuated by means of an operating pedal and a simulator which interacts with the pressure generator and which has a simulator spring. The aim of the invention is to produce a harmonic pedal characteristic and to considerably improve the haptic feel of the pedal so that it corresponds to a large extent with human ergonomics. To this end, the simulator (15) is formed by metallic bellows (17) which are impinged upon by the hydraulic pressure controlled in the pressure generator (2). The area inside the bellows accommodates the simulator spring (18) and can be connected to a reservoir (7) for the pressure means.

Description

Betätigungseinrichtung für ein elektronisch regelbares BremsbetätigungsSystemActuator for an electronically controllable brake actuation system
Die Erfindung betrifft eine Betätigungseinrichtung für ein elektronisch regelbares Bremssystem für Kraftfahrzeuge, die aus einem mittels eines Betätigungspedals betätigbaren Druckgeber sowie einem mit dem Druckgeber zusammenwirkenden Simulator besteht.The invention relates to an actuating device for an electronically controllable braking system for motor vehicles, which consists of a pressure sensor which can be actuated by means of an actuating pedal and a simulator which interacts with the pressure sensor.
Bei einem Bremssystem dieses Typs ist zu unterscheiden zwischen dem normalen Betriebsfall und dem Betrieb ohne Serv.ofunktion, im weiteren Verlauf als Notfunktion bezeichnet, wie er zum Beispiel beim Ausfall der Elektronik eintritt.In a brake system of this type, a distinction must be made between normal operation and operation without a servo function, hereinafter referred to as an emergency function, as occurs, for example, if the electronics fail.
Eine derartige Betätigungseinrichtung ist z.B. aus der internationalen Patentanmeldung WO 95/28307 bekannt. Der Simulator der vorbekannten Betätigungseinrichtung, deren Druckgeber als ein Tandemhauptbremszylinder ausgeführt ist, ist im Hauptzylindergehäuse ausgebildet und besteht im wesentlichen aus einer Simulatorkammer , die von einem Simulatorkolben begrenzt und als Bestandteil eines Hauptbremszylinder-Druckraums ausgebildet ist. Der Simulatorkolben, der mittels einer Simulatorfeder vorgespannt ist, ist dabei vorzugsweise in einem Hauptzylinderkolben geführt und begrenzt darin eine hydraulische Kammer, die mit einem dem Tandemhauptzylinder zugeordneten drucklosen Druckmittelvorratsbehalter in Verbindung steht.Such an actuator is e.g. known from international patent application WO 95/28307. The simulator of the known actuator, the pressure transmitter is designed as a tandem master cylinder, is formed in the master cylinder housing and consists essentially of a simulator chamber, which is delimited by a simulator piston and is formed as part of a master cylinder pressure chamber. The simulator piston, which is pretensioned by means of a simulator spring, is preferably guided in a master cylinder piston and delimits a hydraulic chamber therein which is connected to a pressure-free pressure medium reservoir associated with the tandem master cylinder.
Weniger vorteilhaft ist bei der vorbekannten Betätigungseinrichtung die Vorspannung der Simulatorfeder anzusehen, die erforderlich ist, um den bzw. die Hauptzylinderkolben in ihre Ausgangslage zurückzustellen, und die eine Unstetigkeit in der Pedalcharakteristik zurThe pretension of the simulator spring, which is required to return the master cylinder piston or pistons to their starting position and which has a discontinuity in the pedal characteristic, is less advantageous in the known actuating device
BESTÄTIGUNGSKOPSE - 2 -CONFIRMATION COPES - 2 -
Folge haben kann. Außerdem besteht bei der bekannten Anordnung keine Möglichkeit, die vom Simulatorkolben begrenzte hydraulische Simulatorkammer abzusperren, so daß ein optimiertes Pedalverhalten (härteres Pedal, verkürzter Pedalweg) in der Notfunktion nicht gewährleistet werden kann.Can have consequences. In addition, in the known arrangement there is no possibility of shutting off the hydraulic simulator chamber delimited by the simulator piston, so that an optimized pedal behavior (harder pedal, shortened pedal travel) cannot be guaranteed in the emergency function.
Es ist daher Aufgabe der vorliegenden Erfindung eine Betätigungseinrichtung für ein elektronisch regelbares Bremsbetätigungssystem der eingangs genannten Gattung vorzuschlagen, die die Realisierung einer harmonischen Pedalcharakteristik und somit eine erhebliche Verbesserung des haptischen Pedalgefühls ermöglicht, das der menschlichen Ergonomie weitgehend entspricht.It is therefore an object of the present invention to propose an actuation device for an electronically controllable brake actuation system of the type mentioned at the outset, which enables the realization of a harmonic pedal characteristic and thus a considerable improvement in the haptic pedal feel, which largely corresponds to human ergonomics.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Simulator durch einen mit dem im Druckgeber eingesteuerten hydraulischen Druck beaufschlagbaren reibungsfreien metallischen Faltenbalg gebildet ist, dessen Innenraum die Simulatorfeder aufnimmt und mit einem drucklosen Druckmittelvorratsbehalter verbindbar ist. Die Simulatorfeder, die eine progressive Kraft-Weg-Kennlinie aufweist, ist dabei vorzugsweise im Faltenbalg vorspannungsfrei angeordnet. Durch diese Maßnahmen wird eine ideale Pedalkraft-Weg-Kennlinie dargestellt.This object is achieved in that the simulator is formed by a friction-free metallic bellows which can be acted upon by the hydraulic pressure input into the pressure transmitter, the interior of which accommodates the simulator spring and can be connected to an unpressurized pressure medium reservoir. The simulator spring, which has a progressive force-displacement characteristic, is preferably arranged in the bellows free of prestress. These measures represent an ideal pedal force-displacement characteristic.
Eine wesentliche Verbesserung des Pedalgefühls wird bei einer vorteilhaften Ausführung der erfindungsgemäßen Betätigungseinrichtung dadurch erreicht, daß in der Verbindung zwischen dem Innenraum des Faltenbalges und dem Druckmittelvorratsbehalter eine Blende eingefügt ist. Die Blende, die vorteilhafterweise im Inneren des Fal- - 3 -A significant improvement in the pedal feel is achieved in an advantageous embodiment of the actuating device according to the invention in that a cover is inserted in the connection between the interior of the bellows and the pressure medium reservoir. The cover, which is advantageously inside the folding - 3 -
tenbalges angeordnet sein kann, ist dabei als eine variable Blende ausgeführt, deren Durchflußquerschnitt vom Betätigungspedalweg und der -antrittsgeschwindigkeit abhängig ist. Die erwähnte Abhängigkeit wird bei einer vorteilhaften Weiterbildung der Erfindung dadurch erreicht, daß die Blende durch einen in einer Bohrung verschiebbaren Blendenstift variablen Querschnitts gebildet ist.tenbalges can be arranged, is designed as a variable orifice, the flow cross-section of which depends on the actuation pedal travel and the approach speed. In an advantageous development of the invention, the above-mentioned dependency is achieved in that the diaphragm is formed by a diaphragm pin which can be displaced in a bore and has a variable cross section.
Um in der Notbremsfunktion ein optimiertes Pedalverhalten gewährleisten zu können sieht eine weitere vorteilhafte Ausgestaltung des Erfindungsgegenstandes vor, daß die Verbindung zwischen dem Innenraum des Faltenbalges und dem Druckmittelvorratsbehalter mittels einer Ventileinrichtung absperrbar ist. Durch diese Maßnahme wird erreicht, daß der Simulator in einem Notfall, in dem der Bremsdruck zum Zweck einer Bremsung durch Betätigung des Druckerzeugers aufgebaut wird, kein Druckmittelvolumen mehr aufnehmen kann. Das Absperren der vorhin erwähnten hydraulischen Verbindung hat ein verbessertes Pedalverhalten (härteres Pedal, verkürzter Pedalweg) bei Systemausfall zur Folge. Die Ventileinrichtung ist dabei mechanisch, vorzugsweise durch die Betätigungsbewegung eines Druckgeberkolbens, betätigbar.In order to be able to guarantee optimized pedal behavior in the emergency braking function, a further advantageous embodiment of the subject matter of the invention provides that the connection between the interior of the bellows and the pressure medium reservoir can be shut off by means of a valve device. This measure ensures that the simulator can no longer absorb any pressure medium volume in an emergency, in which the brake pressure is built up for the purpose of braking by actuating the pressure generator. Shutting off the hydraulic connection mentioned above results in improved pedal behavior (harder pedal, shorter pedal travel) in the event of a system failure. The valve device can be actuated mechanically, preferably by the actuating movement of a pressure sensor piston.
Dabei ist es besonders sinnvoll, wenn der Druckgeber als ein Tandemhauptzylinder ausgeführt ist, und die Betätigung der Ventileinrichtung durch den Sekundärkolben des Tandemhauptzylinders, beispielsweise mittels eines drehbar gelagerten zweiarmigen Hebels erfolgt.It is particularly useful if the pressure transmitter is designed as a tandem master cylinder and the valve device is actuated by the secondary piston of the tandem master cylinder, for example by means of a rotatably mounted two-armed lever.
Die Erfindung wird in der nachfolgenden Beschreibung ei- - 4 -The invention is described in the following description. - 4 -
nes Ausführungsbeispiels unter Bezugnahme auf die beiliegende Zeichnung näher erläutert, deren einzige Figur eine schematische Schnittdarstellung der erfindungsgemäßen Betätigungseinrichtung zeigt.Nes embodiment explained with reference to the accompanying drawings, the single figure shows a schematic sectional view of the actuating device according to the invention.
Die in der Zeichnung dargestellte Betätigungseinrichtung besteht im wesentlichen aus einem mittels eines Betätigungspedals 1 betätigbaren, zweikreisigen Druckerzeuger bzw. Tandemhauptzylinder 2, der durch zwei Kolben 3,4 begrenzte, voneinander getrennte Druckräume 5,6 aufweist, die mit einem drucklosen Druckmittelvorratsbehalter 7 in Verbindung stehen. An die beiden Druckräume (Primärdruckraum 5, Sekundärdruck-raum 6) sind mittels absperrbarer hydraulischer Verbindungen 8, 9 nicht gezeigte, den Fahrzeugachsen zugeordnete hydraulische Radbremsen angeschlossen. Außerdem begrenzen die Kolben 3, 4 im Gehäuse 10 des TandemhauptZylinders 2 Nachlaufräume 11, 12, die einerseits über in den Kolben 3, 4 angeordnete Zentralventile 13, 14 mit den zugeordneten Druckräumen 5, 6 und andererseits über im Hauptzylindergehäuse 10 ausgebildete Kanäle 28, 29 mit dem Druckmittelvorratsbehalter 7 in Verbindung stehen.The actuating device shown in the drawing consists essentially of a two-circuit pressure generator or tandem master cylinder 2 which can be actuated by means of an actuating pedal 1 and which has pressure chambers 5, 6 which are delimited and separated from one another by two pistons 3, 4 and which are connected to an unpressurized pressure medium reservoir 7 . Hydraulic wheel brakes (not shown) associated with the vehicle axles are connected to the two pressure chambers (primary pressure chamber 5, secondary pressure chamber 6) by means of lockable hydraulic connections 8, 9. In addition, the pistons 3, 4 in the housing 10 of the tandem master cylinder 2 delimit trailing spaces 11, 12, which on the one hand have central valves 13, 14 arranged in the pistons 3, 4 with the associated pressure spaces 5, 6 and on the other hand have channels 28, 29 formed in the main cylinder housing 10 are in connection with the pressure medium reservoir 7.
Wie der Zeichnung weiter zu entnehmen ist, ist an den ersten bzw. Primärdruckraum 5 eine hydraulische Kammer 16 angeschlossen, die einen metallischen Faltenbalg 17 aufnimmt, der eine Begrenzung der Kammer 16 bildet, so daß er mit dem im Primärdruckraum 5 durch die Betätigung des Pedals 1 eingesteuerten Druck beaufschlagbar ist. Der Faltenbalg 17 bildet zusammen mit einer in seinem Inneren angeordneten Simulatorfeder 18 einen Pedalsimulator 15, der beim Absperren 5 -As can be seen from the drawing, a hydraulic chamber 16 is connected to the first or primary pressure chamber 5, which receives a metallic bellows 17, which forms a boundary of the chamber 16, so that it with the in the primary pressure chamber 5 by pressing the pedal 1 controlled pressure can be applied. The bellows 17 forms, together with a simulator spring 18 arranged in its interior, a pedal simulator 15 which, when shut off 5 -
der Druckräume 5, 6 dem Fahrer ein angenehmes, der menschlichen Ergonomie entsprechendes Pedalgefühl vermittelt. Außerdem ist im Innenraum des Faltenbalges 17 ein hülsenförmiges Teil 21 angeordnet, das eine Öffnung 22 aufweist. Die Öffnung 22 bildet zusammen mit einem in die Öffnung 22 einführbaren, mit dem Faltenbalg 17 in Verbindung stehenden Blendenstift 23 mit variablem Querschnitt eine Blende 20, die als Dämpfungselement dient. In dem Innenraum des vorhin erwähnten Teiles 21 mündet ein hydraulischer Kanal 24, der über den Nachlaufräum 12 des Sekundärdruckraumes 6 mit dem Druckmittelvorratsbehalter 7 in Verbindung steht. Eine in den Kanal 24 eingefügte Ventileinrichtung 25 ermöglicht ein Absperren der fluidischen Verbindung zwischen dem Innenraum 19 des Faltenbalges 17 und dem Druckmittelvorratsbehalter 7, so daß der Pedalsimulator 15 in der Notbremsfunktion, bei der ein hydraulischer Druck in den nicht gezeigten Radbremsen des Fahrzeuges durch Verschieben der Hauptzylinderkolben 3, 4 aufgebaut wird, kein Druckmittelvolumen mehr aufnehmen kann. Dabei ist es besonders sinnvoll, wenn die Ventileinrichtung 25 durch die Bewegung des Sekundärkolbens 4 mechanisch betätigt wird. Zu diesem Zweck ist ein drehbar gelagerter zweiarmiger Hebel 26 vorgesehen, der einerseits an einem Schließglied 27 der Ventileinrichtung 25 anliegt und andererseits mit dem Sekundärkolben 4 zusammenwirkt. Eine das Schließglied 27 in der Schließrichtung der Ventileinrichtung 25 vorspannende Ventilfeder 28 sorgt dabei für spielfreies Anliegen des Hebels 26 am Sekundärkolben 4.the pressure chambers 5, 6 provide the driver with a pleasant pedal feel that corresponds to human ergonomics. In addition, a sleeve-shaped part 21 is arranged in the interior of the bellows 17, which has an opening 22. The opening 22 forms, together with an insertable pin 23 with a variable cross section, which can be inserted into the opening 22 and is connected to the bellows 17, and serves as a damping element. In the interior of the previously mentioned part 21, a hydraulic channel 24 opens, which is connected to the pressure medium reservoir 7 via the trailing space 12 of the secondary pressure space 6. A valve device 25 inserted into the channel 24 enables the fluidic connection between the interior 19 of the bellows 17 and the pressure medium reservoir 7 to be shut off, so that the pedal simulator 15 has the emergency braking function, in which a hydraulic pressure in the wheel brakes, not shown, of the vehicle by shifting the Master cylinder piston 3, 4 is built up, can no longer accommodate pressure medium volume. It is particularly useful if the valve device 25 is actuated mechanically by the movement of the secondary piston 4. For this purpose, a rotatably mounted two-armed lever 26 is provided, which on the one hand abuts a closing member 27 of the valve device 25 and on the other hand interacts with the secondary piston 4. A valve spring 28 biasing the closing member 27 in the closing direction of the valve device 25 ensures that the lever 26 bears against the secondary piston 4 without play.
Die Funktionsweise derartiger Betätigungseinheiten ist dem auf dem einschlägigen technischen Gebiet tätigen - 6 -The operation of such actuation units is that in the relevant technical field - 6 -
Fachmann bekannt, so daß sie im vorliegenden Zusammenhang nicht ausführlich erklärt zu werden braucht. Known expert, so that it need not be explained in detail in the present context.

Claims

- 7 -Patentansprüche - 7 patent claims
Betätigungseinrichtung für ein elektronisch regelbares Bremssystem für Kraftfahrzeuge, die aus einem mittels eines Betätigungspedals betätigbaren Druk- kerzeuger sowie einem mit dem Druckerzeuger zusammenwirkenden, eine Simulatorfeder aufweisenden Simulator besteht, dadurch gekennzeichnet, daß der Simulator (15) durch einen mit dem im Druckerzeuger (2) eingesteuerten hydraulischen Druck beaufschlagbaren metallischen Faltenbalg (17) gebildet ist, dessen Innenraum die Simulatorfeder (18) aufnimmt und mit einem drucklosen Druckmittelvorratsbehalter (7) verbindbar ist.Actuating device for an electronically controllable braking system for motor vehicles, which consists of a pressure generator which can be actuated by means of an actuating pedal and a simulator which interacts with the pressure generator and has a simulator spring, characterized in that the simulator (15) is replaced by a simulator in the pressure generator (2). controlled hydraulic pressure actable metallic bellows (17) is formed, the interior of which receives the simulator spring (18) and can be connected to a pressureless pressure medium reservoir (7).
Betätigungseinheit nach Anspruch 1, dadurch gekennzeichnet, daß die Simulatorfeder (18) im Faltenbalg (17) vorspannungsfrei angeordnet ist.Actuating unit according to claim 1, characterized in that the simulator spring (18) is arranged in the bellows (17) free of prestress.
Betätigungseinheit nach Anspruch 1, dadurch gekennzeichnet, daß in der Verbindung zwischen dem Innenraum (19) des Faltenbalges (17) und dem Druckmittelvorratsbehalter (7) eine Blende (20) eingefügt ist.Actuating unit according to claim 1, characterized in that an aperture (20) is inserted in the connection between the interior (19) of the bellows (17) and the pressure medium reservoir (7).
Betätigungseinheit nach Anspruch 3, dadurch gekennzeichnet, daß die Blende (20) als eine variable Blende gestaltet ist, deren Durchflußquerschnitt vom Betätigungspedalweg und/oder - antrittsgeschwindigkeit abhängig ist. Actuating unit according to claim 3, characterized in that the diaphragm (20) is designed as a variable diaphragm, the flow cross-section of which is dependent on the actuating pedal travel and / or approach speed.
5. Betätigungseinheit nach Anspruch 3, dadurch gekennzeichnet, daß die Blende (20) durch einen in einer Bohrung (22) verschiebbaren Blendenstift (23) variablen Querschnitts gebildet ist.5. Actuating unit according to claim 3, characterized in that the diaphragm (20) is formed by a variable cross-section in a bore (22) displaceable diaphragm pin (23).
6. Betätigungseinheit nach einem der Ansprüche 3 bis 5 dadurch gekennzeichnet, daß die Blende (20) im Innenraum (19) des Faltenbalges (17) angeordnet ist.6. Actuating unit according to one of claims 3 to 5, characterized in that the diaphragm (20) in the interior (19) of the bellows (17) is arranged.
7. Betätigungseinheit nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Verbindung zwischen dem Innenraum (19) des Faltenbalges (17) und dem Druckmittelvorratsbehalter (7) mittels einer Ventileinrichtung (25) absperrbar ist.7. Actuating unit according to one of claims 1 to 6, characterized in that the connection between the interior (19) of the bellows (17) and the pressure medium reservoir (7) can be shut off by means of a valve device (25).
8. Betätigungseinrichtung nach Anspruch 7, dadurch gekennzeichnet, daß die Ventileinrichtung (25) mittels eines Druckerzeugerkolbens (4) betätigbar ist.8. Actuating device according to claim 7, characterized in that the valve device (25) can be actuated by means of a pressure generator piston (4).
9. Betätigungseinrichtung nach Anspruch 8, dadurch gekennzeichnet, daß der Druckerzeuger (2) als Tandemhauptzylinder ausgeführt ist, und daß die Betätigung der Ventileinrichtung (25) durch den Sekundärkolben (4) des Tandemhauptzylinders (2) erfolgt.9. Actuating device according to claim 8, characterized in that the pressure generator (2) is designed as a tandem master cylinder, and that the actuation of the valve device (25) by the secondary piston (4) of the tandem master cylinder (2).
10. Betätigungseinrichtung nach Anspruch 9, dadurch gekennzeichnet, daß die Betätigung der Ventileinrichtung (25) mittels eines drehbar gelagerten zweiarmigen Hebels (26) erfolgt. - 9 -10. Actuating device according to claim 9, characterized in that the actuation of the valve device (25) by means of a rotatably mounted two-armed lever (26). - 9 -
11. Betätigungseinrichtung nach einem der vorhergehenden Ansprüche dadurch gekennzeichnet, daß die Simulatorfeder (18) eine progressive Kraft-Weg-Kennlinie aufweist. 11. Actuating device according to one of the preceding claims, characterized in that the simulator spring (18) has a progressive force-displacement characteristic.
PCT/EP1999/000693 1998-02-07 1999-02-03 Actuation device for an electronically regulated brake actuation system WO1999039956A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19804939.0 1998-02-07
DE19804939 1998-02-07
DE19822411.7 1998-05-19
DE19822411A DE19822411A1 (en) 1998-02-07 1998-05-19 Actuator for an electronically controllable brake actuation system

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19944590A1 (en) * 1999-09-16 2001-03-22 Continental Teves Ag & Co Ohg Actuator for electrohydraulically actuated braking system has two individually operated assemblies mounted separately and connected via flexible connecting line
WO2014189066A1 (en) * 2013-05-24 2014-11-27 日立オートモティブシステムズ株式会社 Brake device and brake system
WO2014192643A1 (en) * 2013-05-27 2014-12-04 日立オートモティブシステムズ株式会社 Brake device and brake system

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DE3526556A1 (en) * 1985-07-25 1987-01-29 Teves Gmbh Alfred BRAKE SYSTEM WITH HYDRAULIC BRAKE FORCE REINFORCEMENT
DE4239386A1 (en) * 1992-11-24 1994-05-26 Teves Gmbh Alfred Hydraulic friction braking system for electrically propelled vehicle - incorporates pedal with characteristic feel imparted by compression spring in coupling to electromagnet-driven braking piston
DE4343386A1 (en) * 1993-12-18 1995-06-22 Bosch Gmbh Robert Hydraulic braking system for passenger vehicle
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DE3526556A1 (en) * 1985-07-25 1987-01-29 Teves Gmbh Alfred BRAKE SYSTEM WITH HYDRAULIC BRAKE FORCE REINFORCEMENT
DE4239386A1 (en) * 1992-11-24 1994-05-26 Teves Gmbh Alfred Hydraulic friction braking system for electrically propelled vehicle - incorporates pedal with characteristic feel imparted by compression spring in coupling to electromagnet-driven braking piston
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WO1995028307A1 (en) * 1994-04-19 1995-10-26 Itt Automotive Europe Gmbh Electronically adjustable brake operating system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19944590A1 (en) * 1999-09-16 2001-03-22 Continental Teves Ag & Co Ohg Actuator for electrohydraulically actuated braking system has two individually operated assemblies mounted separately and connected via flexible connecting line
DE19944590B4 (en) * 1999-09-16 2015-04-02 Continental Teves Ag & Co. Ohg Actuating device for an electrohydraulically actuated brake system
WO2014189066A1 (en) * 2013-05-24 2014-11-27 日立オートモティブシステムズ株式会社 Brake device and brake system
JP2014227097A (en) * 2013-05-24 2014-12-08 日立オートモティブシステムズ株式会社 Brake gear and brake system
US10202108B2 (en) 2013-05-24 2019-02-12 Hitachi Automotive Systems, Ltd. Brake apparatus and brake system
WO2014192643A1 (en) * 2013-05-27 2014-12-04 日立オートモティブシステムズ株式会社 Brake device and brake system
US10328919B2 (en) 2013-05-27 2019-06-25 Hitachi Automotive Systems, Ltd. Brake apparatus and brake system

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