WO1995000373A1 - Hydraulic brake system with a device for regulating the brake and drive slip - Google Patents

Hydraulic brake system with a device for regulating the brake and drive slip Download PDF

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Publication number
WO1995000373A1
WO1995000373A1 PCT/EP1994/001914 EP9401914W WO9500373A1 WO 1995000373 A1 WO1995000373 A1 WO 1995000373A1 EP 9401914 W EP9401914 W EP 9401914W WO 9500373 A1 WO9500373 A1 WO 9500373A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
pressure
line
brake
master cylinder
Prior art date
Application number
PCT/EP1994/001914
Other languages
German (de)
French (fr)
Inventor
Ralf Kaiser
Original Assignee
Itt Automotive Europe 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 Itt Automotive Europe Gmbh filed Critical Itt Automotive Europe Gmbh
Publication of WO1995000373A1 publication Critical patent/WO1995000373A1/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
    • B60T8/36—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
    • B60T8/3675—Electromagnetic valves specially adapted for anti-lock brake and traction control systems integrated in modulator units
    • B60T8/368—Electromagnetic valves specially adapted for anti-lock brake and traction control systems integrated in modulator units combined with other mechanical components, e.g. pump units, master cylinders
    • 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
    • B60T8/48—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 connecting the brake actuator to an alternative or additional source of fluid pressure, e.g. traction control systems
    • B60T8/4809—Traction control, stability control, using both the wheel brakes and other automatic braking systems
    • B60T8/4827—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems
    • B60T8/4863—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems
    • B60T8/4872—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems pump-back systems

Definitions

  • Hydraulic brake system with a device for regulating the brake slip and the drive slip
  • the present invention is based on a hydraulic brake system according to the preamble of the main claim.
  • a generic brake system is known from DE 41 08 756 AI.
  • the known brake system has i.a. a valve block in which an electromagnetically operated, normally open inlet valve and an electromagnetically operated normally closed outlet valve are arranged for each wheel brake.
  • a separating valve is inserted into the brake line, which valve is closed during traction control.
  • the pressure line of the pump opens into the brake line.
  • valve block of a generic brake system therefore usually contains eight intake and exhaust valves, one or two isolation valves - depending on the brake circuit division - and at least one pressure switch.
  • This large number of elements in a common valve block makes the valve block an unwieldy structural unit which, in its entirety, has to be accommodated in the vehicle.
  • the object of the present invention is to downsize the valve block of a generic brake system without having to do without functional elements, and no additional hydraulic lines are to be obtained.
  • the principle of the invention thus consists in using a valve switched by the master cylinder pressure to actuate the pressure switch. This allows it to be separated from the valve block, but does not have to be provided with an additional hydraulic connection.
  • the figure shows a brake system according to the invention, in which only the hydraulic lines, but not the electrical lines are shown.
  • the brake line 3 runs via the inlet valve 4 to the wheel cylinder 5 of a driven wheel. From there, the return line 7 runs via the outlet valve 6 to the low-pressure accumulator 8. From the low-pressure accumulator 8, the first suction line 9 leads via the pre-pressure valve 11 to the suction side of the pump 13.
  • the second suction line 10 connects the suction side of the pump 13 to the brake line 3
  • the changeover valve 12 is arranged in this second suction line 10.
  • the brake valve 16 is the isolating valve
  • the brake system shown has a diagonal brake circuit division, so that the wheel cylinders of a driven and a non-driven wheel are located in a brake circuit.
  • the wheel cylinder 18 of the non-driven wheel is connected to the brake line 3 between the master cylinder 1 and the isolation valve 14.
  • the wheel cylinder 18 is connected to the brake line 3 on the pump side by the isolating valve 14.
  • the operation of this brake system corresponds to the brake system known from DE 41 08 756 AI, which forms the basis of the prior art of the present application.
  • the changeover valve 12 is inserted into the housing 20 with the screw insert 19. It has an inlet chamber 21, which communicates with the master cylinder 1, and an outlet chamber 22, which is connected to the suction side of the pump 13. The connection between the inlet chamber 21 and the outlet chamber 22 can be blocked by the contact of the closing member 24 on the valve seat 23.
  • the outlet chamber 22 is separated from the atmosphere by the membrane 25.
  • the membrane 25 moves the closing member 24 via the valve tappet 26.
  • the membrane 25 On the side exposed to atmospheric pressure, the membrane 25 also moves the transmission tappet 27, which actuates the switch button 31 of the pressure switch 28.
  • the pressure switch 28 is fastened with the push-on sleeve 29 on the screw insert 19 of the changeover valve 12.
  • the push-on sleeve 29 has a central recess 30 through which the transmission plunger 27 protrudes and rests on the switch button 31.
  • the master cylinder 1 In the traction control operation of the brake system, the master cylinder 1 is depressurized.
  • the changeover valve 12 remains open so that the pump 13 can draw in pressure medium from the pressure medium container 2 through the second suction line 10 via the master cylinder 1. If a sudden pedal-operated braking now begins, the changeover valve 12 closes, so that the pressure switch 28 is actuated. Even if in such a case the brake pedal may not be able to be depressed to the extent that the brake light switch is actuated, the pressure build-up in the brake line 3 causes a corresponding signal to be emitted via the pressure switch 28.

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

Abstract

The present invention relates to a brake system with ABS and ASR in which, in order to reduce the size of the valve block, the pressure switch for detecting pedal-actuated braking is separated from the valve block. It is switched by a changeover valve hydraulically actuated by the master cylinder pressure and open when not under pressure which locks the intake line for the drive slip control on pedal-actuated braking.

Description

Hydraulische Bremsanlage mit einer Einrichtung zur Regelung des Bremsschlupfes und des AntriebsSchlupfesHydraulic brake system with a device for regulating the brake slip and the drive slip
Die vorliegende Erfindung geht aus von einer hydraulischen Bremsanlage gemäß dem Oberbegriff des Hauptanspruchs.The present invention is based on a hydraulic brake system according to the preamble of the main claim.
Eine gattungsgemäße Bremsanlage ist aus der DE 41 08 756 AI bekannt. Die bekannte Bremsanlage weist u.a. einen Ventilblock auf, in welchem für jede Radbremse ein elektromagnetisch betätigtes, stromlos geöffnetes Einlaßventil sowie ein elektromagnetisch, betätigtes stromlos geschlossenes Auslaßventil angeordnet sind. Zwischen dem Hauptbremszylinder und dem Einlaßventil zur Radbremse des angetriebenen Rades ist in die Bremsleitung ein Trennventil eingefügt, welches während einer Antriebs¬ schlupfregelung geschlossen wird. Auf der dem Haupt¬ zylinder abgewandten Seite des Trennventils mündet die Druckleitung der Pumpe in die Bremsleitung. Bei einer plötzlichen pedalbetätigten Bremsung während einer An¬ triebsschlupfregelung kann es unter bestimmten Umständen passieren, daß das Bremspedal nicht weit genug durch¬ getreten werden kann, um den Bremslichtschalter zu betätigen. Für diesen Fall ist in gattungsgemäßenA generic brake system is known from DE 41 08 756 AI. The known brake system has i.a. a valve block in which an electromagnetically operated, normally open inlet valve and an electromagnetically operated normally closed outlet valve are arranged for each wheel brake. Between the master brake cylinder and the inlet valve for the wheel brake of the driven wheel, a separating valve is inserted into the brake line, which valve is closed during traction control. On the side of the separating valve facing away from the master cylinder, the pressure line of the pump opens into the brake line. In the event of sudden pedal-operated braking during a traction control system, under certain circumstances it can happen that the brake pedal cannot be depressed far enough to actuate the brake light switch. For this case is in generic
ERSAΪZBLATT (REGEL 26) Bremsanlagen im Ventilblock ein Druckschalter vorgesehen, der hauptzylinderseitig vom Trennventil angeordnet ist und Hauptzylinderdruck detektiert. Der Ventilblock einer gattungsgemäßen Bremsanlage enthält also in der Regel acht Einlaß- und Auslaßventile, ein oder zwei Trennventile - je nach Bremskreisaufteilung - sowie mindestens einen Druckschalter. Diese Vielzahl von Elementen in einem gemeinsamen Ventilblock macht den Ventilblock zu einer unhandlichen Baueinheit, welche in ihrer Gesamtheit im Fahrzeug untergebracht werden muß. Dagegen steht der Trend, immer mehr technische Ausstattung unter einer Motorhaube eines Fahrzeugs unterzubringen. Der zur Verfügung stehende Bauraum ist daher oftmals in Nischen verteilt, welche die Aufnahme eines sperrigen Ventilblocks nicht erlauben.SUBSTITUTE SHEET (RULE 26) Brake systems in the valve block, a pressure switch is provided, which is arranged on the master cylinder side of the isolating valve and detects master cylinder pressure. The valve block of a generic brake system therefore usually contains eight intake and exhaust valves, one or two isolation valves - depending on the brake circuit division - and at least one pressure switch. This large number of elements in a common valve block makes the valve block an unwieldy structural unit which, in its entirety, has to be accommodated in the vehicle. On the other hand, there is a trend to accommodate more and more technical equipment under the hood of a vehicle. The available space is therefore often distributed in niches that do not allow the inclusion of a bulky valve block.
Die Aufgabe der vorliegenden Erfindung besteht darin, den Ventilblock einer gattungsgemäßen Bremsanlage zu verkleinern, ohne auf Funktionselemente verzichten zu müssen, wobei keine zusätzlichen hydraulischen Leitungen anfallen sollen.The object of the present invention is to downsize the valve block of a generic brake system without having to do without functional elements, and no additional hydraulic lines are to be obtained.
Diese Aufgabe wird gelöst durch die kennzeichnenden Merk¬ male des Hauptanspruchs. Das Prinzip der Erfindung besteht also in der Ausnutzung eines vom Hauptzylinderdruck ge¬ schalteten Ventils zur Betätigung des Druckschalters. Dadurch kann dieser aus dem Ventilblock ausgegliedert werden, muß aber nicht mit einem zusätzlichen hydrau¬ lischen Anschluß versehen werden.This object is achieved by the characterizing features of the main claim. The principle of the invention thus consists in using a valve switched by the master cylinder pressure to actuate the pressure switch. This allows it to be separated from the valve block, but does not have to be provided with an additional hydraulic connection.
Die Befestigung des Druckschalters am Ventilgehäuse er¬ möglicht einen gemeinsamen Einbau der beiden Funktions¬ elemente in die Bremsanlage. Eine nähere Erläuterung des Erfindungsgedankens erfolgt nun durch die Beschreibung eines bevorzugten Ausführungs- beispiels anhand einer Zeichnung.The attachment of the pressure switch to the valve housing enables the two functional elements to be installed together in the brake system. A more detailed explanation of the concept of the invention will now be given by the description of a preferred embodiment using a drawing.
Die Figur zeigt eine erfindungsgemäße Bremsanlage, bei welcher nur die hydraulischen Leitungen, nicht aber die elektrischen Leitungen dargestellt sind.The figure shows a brake system according to the invention, in which only the hydraulic lines, but not the electrical lines are shown.
Vom Hauptzylinder 1, welcher an den Druckmittelbehälter 2 angeschlossen ist, verläuft die Bremsleitung 3 über das Einlaßventil 4 zum Radzylinder 5 eines angetriebenen Rades. Von dort verläuft die Rücklaufleitung 7 über das Auslaßventil 6 zum Niederdruckspeicher 8. Vom Niederdruck¬ speicher 8 führt die erste Saugleitung 9 über das Vor¬ druckventil 11 zur Saugseite der Pumpe 13. Die zweite Saugleitung 10 verbindet die Saugseite der Pumpe 13 mit der Bremsleitung 3. In dieser zweiten Saugleitung 10 ist das Umschaltventil 12 angeordnet. Die Druckseite der PumpeFrom the master cylinder 1, which is connected to the pressure medium container 2, the brake line 3 runs via the inlet valve 4 to the wheel cylinder 5 of a driven wheel. From there, the return line 7 runs via the outlet valve 6 to the low-pressure accumulator 8. From the low-pressure accumulator 8, the first suction line 9 leads via the pre-pressure valve 11 to the suction side of the pump 13. The second suction line 10 connects the suction side of the pump 13 to the brake line 3 The changeover valve 12 is arranged in this second suction line 10. The pressure side of the pump
13 ist über die Druckleitung 17 mit der Bremsleitung 3 verbunden. Damit für den Fall einer Antriebsschlupf- regelung die Pumpe nicht im Kreis fördert, ist in die Bremsleitung 3 zwischen Abzweigung der zweiten Saugleitung 10 und Einmündung der Druckleitung 17 das Trennventil 14 eingebaut. Während einer Antriebsschlupfregelung wird es elektromagnetisch geschlossen. Das Überdruckventil 15 be¬ grenzt den vor dem Einlaßventil 4 anstehenden Pumpendruck während einer Antriebsschlupfregelung. Zur Ermöglichung einer pedalbetätigten Bremsung während einer Antriebs- Schlupfregelung ist das Einbremsventil 16 dem Trennventil13 is connected to the brake line 3 via the pressure line 17. So that the pump does not circulate in the event of traction control, the isolating valve 14 is installed in the brake line 3 between the branching of the second suction line 10 and the mouth of the pressure line 17. It is closed electromagnetically during traction control. The pressure relief valve 15 limits the pump pressure in front of the inlet valve 4 during traction control. To enable pedal-operated braking during a traction control system, the brake valve 16 is the isolating valve
14 parallel geschaltet. Die dargestellte Bremsanlage besitzt eine diagonale Bremskreisaufteilung, so daß sich in einem Bremskreis jeweils die Radzylinder eines angetriebenen und eines nichtangetriebenen Rades befinden. In diesem Fall ist der Radzylinder 18 des nicht angetriebenen Rades mit der Bremsleitung 3 zwischen Hauptzylinder 1 und Trennventil 14 verbunden. Bei einer Bremskreisaufteilung, bei welcher sich die Radzylinder von zwei angetriebenen Rädern in einem gemeinsamen Bremskreis befinden, wird der Rad¬ zylinder 18 pumpenseitig vom Trennventil 14 an die Brems¬ leitung 3 angeschlossen. Die Funktionsweise dieser Brems¬ anlage entspricht der aus der DE 41 08 756 AI bekannten Bremsanlage, welche als Stand der Technik der vorliegenden Anmeldung zugrunde liegt.14 connected in parallel. The brake system shown has a diagonal brake circuit division, so that the wheel cylinders of a driven and a non-driven wheel are located in a brake circuit. In this case, the wheel cylinder 18 of the non-driven wheel is connected to the brake line 3 between the master cylinder 1 and the isolation valve 14. In a brake circuit division in which the wheel cylinders of two driven wheels are in a common brake circuit, the wheel cylinder 18 is connected to the brake line 3 on the pump side by the isolating valve 14. The operation of this brake system corresponds to the brake system known from DE 41 08 756 AI, which forms the basis of the prior art of the present application.
Das Umschaltventil 12 ist mit dem Schraubeinsatz 19 in das Gehäuse 20 eingefügt. Es weist eine Einlaßkammer 21 auf, welche mit dem Hauptzylinder 1 in Verbindung steht, und eine Auslaßkammer 22, welche an die Saugseite der Pumpe 13 angeschlossen ist. Die Verbindung zwischen der Einla߬ kammer 21 und der Auslaßkammer 22 ist durch die Anlage des Schließgliedes 24 am Ventilsitz 23 sperrbar. Durch die Membran 25 ist die Auslaßkammer 22 von der Atmosphäre abgetrennt. Die Membran 25 bewegt über den Ventilstößel 26 das Schließglied 24. Auf der dem Atmosphärendruck ausge¬ setzten Seite bewegt die Membran 25 außerdem den Über¬ tragungsstößel 27, welcher den Schaltknopf 31 des Druck¬ schalters 28 betätigt. Der Druckschalter 28 ist mit der Aufsteckhülse 29 am Schraubeinsatz 19 des Umschaltventils 12 befestigt. Die Aufsteckhülse 29 besitzt eine zentrale Ausnehmung 30, durch welche der UbertragungsStößel 27 ragt und am Schaltknopf 31 anliegt. Bei drucklosem Hauptzylinder 1 ist das Umschaltventil 12 geöffnet, da die auf den UbertragungsStößel 27 in Ventil¬ öffnungsrichtung wirkende Druckfeder 32 eine größere Federhärte besitzt als die in Ventilschließrichtung auf den Ventilstößel 26 wirkende Ventilfeder 33. Wenn durch eine pedalbetätigte Bremsung vom Hauptzylinder 1 Druck aufgebaut wird, legt sich das Schließglied 24 an den Ventilsitz 23 an, sobald die vom Hauptzylinderdruck auf die Membran 25 ausgeübte Kraft die Druckfeder 32 zu über¬ winden vermag. Zugleich wird der Druckschalter 28 über den Schaltknopf 31 betätigt. Bei Beendigung der pedalbe¬ tätigten Bremsung öffnet sich das Umschaltventil 12 wieder, so daß auch der Schaltknopf 31 entlastet wird.The changeover valve 12 is inserted into the housing 20 with the screw insert 19. It has an inlet chamber 21, which communicates with the master cylinder 1, and an outlet chamber 22, which is connected to the suction side of the pump 13. The connection between the inlet chamber 21 and the outlet chamber 22 can be blocked by the contact of the closing member 24 on the valve seat 23. The outlet chamber 22 is separated from the atmosphere by the membrane 25. The membrane 25 moves the closing member 24 via the valve tappet 26. On the side exposed to atmospheric pressure, the membrane 25 also moves the transmission tappet 27, which actuates the switch button 31 of the pressure switch 28. The pressure switch 28 is fastened with the push-on sleeve 29 on the screw insert 19 of the changeover valve 12. The push-on sleeve 29 has a central recess 30 through which the transmission plunger 27 protrudes and rests on the switch button 31. When the master cylinder 1 is depressurized, the changeover valve 12 is open, since the compression spring 32 acting on the transmission tappet 27 in the valve opening direction has a greater spring hardness than the valve spring 33 acting in the valve closing direction on the valve tappet 26 , the closing member 24 bears against the valve seat 23 as soon as the force exerted by the master cylinder pressure on the membrane 25 is able to overcome the compression spring 32. At the same time, the pressure switch 28 is actuated via the switch button 31. When the pedal-operated braking is ended, the changeover valve 12 opens again, so that the switch button 31 is also relieved.
Im Antriebsschlupfregelbetrieb der Bremsanlage ist der Hauptzylinder 1 drucklos. Das Umschaltventil 12 bleibt geöffnet, so daß die Pumpe 13 durch die zweite Saugleitung 10 über den Hauptzylinder 1 Druckmittel aus dem Druckmittelbehälter 2 ansaugen kann. Wenn jetzt eine plötzliche pedalbetätigte Bremsung einsetzt, schließt sich das Umschaltventil 12, so daß der Druckschalter 28 betätigt wird. Auch wenn in einem solchen Falle das Bremspedal möglicherweise nicht soweit durchgetreten werden kann, daß der Bremslichtschalter betätigt wird, so bewirkt doch der Druckaufbau in der Bremsleitung 3, daß über den Druckschalter 28 ein entsprechendes Signal abgegeben wird. BezugszeichenlisteIn the traction control operation of the brake system, the master cylinder 1 is depressurized. The changeover valve 12 remains open so that the pump 13 can draw in pressure medium from the pressure medium container 2 through the second suction line 10 via the master cylinder 1. If a sudden pedal-operated braking now begins, the changeover valve 12 closes, so that the pressure switch 28 is actuated. Even if in such a case the brake pedal may not be able to be depressed to the extent that the brake light switch is actuated, the pressure build-up in the brake line 3 causes a corresponding signal to be emitted via the pressure switch 28. Reference list
1 Hauptzylinder1 master cylinder
2 Druckmittelbehälter2 pressure medium tanks
3 Bremsleitung3 brake line
4 Einlaßventil4 inlet valve
5 Radzylinder5 wheel cylinders
6 Auslaßventil6 exhaust valve
7 Rücklaufleitung7 return line
8 Niederdruckspeicher8 low pressure accumulators
9 Erste Saugleitung9 First suction line
10 Zweite Saugleitung10 Second suction line
11 Vordruckventil11 pre-pressure valve
12 Umschaltventil12 changeover valve
13 Pumpe13 pump
14 Trennventi114 isolation valve 1
15 Überdruckventil15 pressure relief valve
16 Einbremsventil16 brake valve
17 Druckleitung17 pressure line
18 Radzylinder18 wheel cylinders
19 Schraubeinsatz19 screw insert
20 Gehäuse20 housing
21 Einlaßkammer21 inlet chamber
22 Auslaßkammer22 outlet chamber
23 Ventilsitz23 valve seat
24 Schließglied24 closing member
25 Membran25 membrane
26 Ventilstößel26 valve lifters
27 UbertragungsStößel27 transfer ram
28 Druckschalter28 pressure switches
29 Aufsteckhülse29 push-on sleeve
30 Ausnehmung30 recess
31 Schaltknopf31 switch button
32 Druckfeder32 compression spring
33 Ventilfeder 33 valve spring

Claims

Patentansprüche claims
1. Hydraulische Bremsanlage mit einer Einrichtung zur Regelung des BremsSchlupfes und des Antriebschlupfes, mit einem pedalbetätigte Hauptzylinder (1) der mit einem Druckmittelbehälter (2) in Verbindung steht, mit einem Radzylinder (5), der zu einem angetriebenen Rad gehört, mit einer Bremsleitung (3) vom Hauptzylinder (1) zum Radzylinder (5), mit einem Einlaßventil (4) in der Bremsleitung (3), mit einem Niederdruckspeicher (8) , mit einer Rücklaufleitung (7) vom Radzylinder (5) zum Niederdruckspeider (8), mit einem Auslaßventil (6) in der Rücklaufleitung (7), mit einer Pumpe (13), mit einer ersten Saugleitung (9) vom Niederdruck¬ speicher (8) zur Saugseite der Pumpe(13), mit einer zweiten Saugleitung (10) von der Bremsleitung (3) zwischen Hauptzylinder (1) und Einlaßventil (4) zur Saugseite der Pumpe, mit einem Trennventil (14) in der Bremsleitung (3) zwischen dem Anschluß der zweiten Saugleitung (10) und dem Einlaßventil (4), mit einer Druckleitung (17) von der Druckseite der Pumpe (13) zur Bremsleitung (3) zwischen Trennventil (14) und Einlaßventil (4) und mit einem hydraulisch vom Hauptzylinderdruck be¬ tätigten, drucklos offenen Umschaltventil (12) in der zweiten Saugleitung (10), dadurch g e k e n n z e i c h n e t, daß das Umschalt¬ ventil (12) mit einem Druckschalter (28) zur Erfassung einer pedalbetätigten Bremsung gekoppelt ist. 1.Hydraulic brake system with a device for controlling the brake slip and the drive slip, with a pedal-operated master cylinder (1) which is connected to a pressure medium container (2), with a wheel cylinder (5) belonging to a driven wheel with a brake line (3) from the master cylinder (1) to the wheel cylinder (5), with an inlet valve (4) in the brake line (3), with a low pressure accumulator (8), with a return line (7) from the wheel cylinder (5) to the low pressure divider (8) , with an outlet valve (6) in the return line (7), with a pump (13), with a first suction line (9) from the low pressure accumulator (8) to the suction side of the pump (13), with a second suction line (10) from the brake line (3) between the master cylinder (1) and inlet valve (4) to the suction side of the pump, with a isolating valve (14) in the brake line (3) between the connection of the second suction line (10) and the inlet valve (4) a pressure line (17) from the pressure side the pump (13) to the brake line (3) between the isolating valve (14) and the inlet valve (4) and with a pressure-free open changeover valve (12) in the second suction line (10) which is actuated hydraulically by the master cylinder pressure, characterized in that the changeover ¬ valve (12) is coupled to a pressure switch (28) for detecting a pedal-operated braking.
2. Hydraulische Bremsanlage nach Anspruch 1, dadurch g e k e n n z e i c h n e t, daß der Druckschalter (28) mit einem Teil (Schraubeinsatz 19) eines das Um¬ schaltventil (12) aufnehmenden Gehäuses (19, 20) starr verbunden ist und von einem Übertragungsstößel (27) betätigt wird, der bei Beaufschlagung des Umschalt¬ ventils (12) mit Hauptzylinderdruck um einen bestimmten Hub aus dem Gehäuse (19, 20) herausgeschoben wird. 2. Hydraulic brake system according to claim 1, characterized in that the pressure switch (28) with a part (screw insert 19) of the Um¬ switching valve (12) receiving housing (19, 20) is rigidly connected and actuated by a transmission plunger (27) which is pushed out of the housing (19, 20) by a certain stroke when the switch valve (12) is acted upon by the master cylinder pressure.
PCT/EP1994/001914 1993-06-19 1994-06-13 Hydraulic brake system with a device for regulating the brake and drive slip WO1995000373A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19934320391 DE4320391A1 (en) 1993-06-19 1993-06-19 Hydraulic brake system with a device for regulating the brake slip and the drive slip
DEP4320391.4 1993-06-19

Publications (1)

Publication Number Publication Date
WO1995000373A1 true WO1995000373A1 (en) 1995-01-05

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Application Number Title Priority Date Filing Date
PCT/EP1994/001914 WO1995000373A1 (en) 1993-06-19 1994-06-13 Hydraulic brake system with a device for regulating the brake and drive slip

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WO (1) WO1995000373A1 (en)

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