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WO2004041608A2 - Hydraulic vehicle brake - Google Patents

Hydraulic vehicle brake Download PDF

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Publication number
WO2004041608A2
WO2004041608A2 PCT/EP2003/012092 EP0312092W WO2004041608A2 WO 2004041608 A2 WO2004041608 A2 WO 2004041608A2 EP 0312092 W EP0312092 W EP 0312092W WO 2004041608 A2 WO2004041608 A2 WO 2004041608A2
Authority
WO
WIPO (PCT)
Prior art keywords
brake
hydraulic vehicle
piston
vehicle brake
spring element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2003/012092
Other languages
German (de)
French (fr)
Other versions
WO2004041608A3 (en
Inventor
Peter Volz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Teves AG and Co OHG
Original Assignee
Continental Teves AG and 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
Application filed by Continental Teves AG and Co OHG filed Critical Continental Teves AG and Co OHG
Priority to DE10393590T priority Critical patent/DE10393590D2/en
Publication of WO2004041608A2 publication Critical patent/WO2004041608A2/en
Publication of WO2004041608A3 publication Critical patent/WO2004041608A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
    • F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/02—Fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/02—Fluid pressure
    • F16D2121/12—Fluid pressure for releasing a normally applied brake, the type of actuator being irrelevant or not provided for in groups F16D2121/04 - F16D2121/10
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
    • F16D2125/34—Mechanical mechanisms converting rotation to linear movement or vice versa acting in the direction of the axis of rotation
    • F16D2125/40—Screw-and-nut
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2127/00—Auxiliary mechanisms
    • F16D2127/008—Trigger mechanisms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2127/00—Auxiliary mechanisms
    • F16D2127/02—Release mechanisms
    • F16D2127/04—Release mechanisms for manual operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2127/00—Auxiliary mechanisms
    • F16D2127/06—Locking mechanisms, e.g. acting on actuators, on release mechanisms or on force transmission mechanisms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2129/00—Type of operation source for auxiliary mechanisms
    • F16D2129/06—Electric or magnetic
    • F16D2129/08—Electromagnets

Definitions

  • the invention relates to a hydraulic vehicle brake with a parking brake device, in particular for motor vehicles, with a brake housing in which a hydraulic operating pressure space is delimited by a brake piston having at least one brake pad, the parking brake device acting on the brake piston and in the applied state by means of a locking device which is activated by a Threaded nut-spindle arrangement is formed, can be locked.
  • a combined service and parking brake is known from WO 97/29292, which can be mechanically locked in the hydraulically applied state by an electrically actuated locking device.
  • the locking device is essentially formed by a threaded nut-spindle arrangement.
  • the threaded nut-spindle arrangement is locked in that an electromagnet pulls the threaded nut having a first friction surface against a compression spring against a second friction surface which is supported on the brake housing.
  • the high currents required to actuate the electromagnet and the complex cable routing of the electromagnet are to be regarded as less advantageous in the known vehicle brake.
  • the spindle has a circular component provided with teeth. has that cooperates with an electromagnetically actuated locking element.
  • electromagnet actuating the locking element has two switching positions, the locking element being in engagement with the teeth of the circular component when the electromagnet is de-energized.
  • a hydraulically loadable working memory which interacts with the brake piston and is formed by a spring element is provided.
  • the spring element is supported on the brake piston and acts on a force-transmitting part which is connected to the brake pad.
  • a further advantageous embodiment provides that the spring element is supported on a storage piston which is in a force-transmitting connection with the brake piston.
  • the spring element is designed in such a way that it does not change its path during service braking. It is particularly advantageous if the spring element is designed in such a way that the comparison of the compression path of the spring element with the force required for this has a maximum.
  • FIG. 1 shows a partial representation in the axial cross section of a first embodiment of the hydraulic vehicle brake according to the invention in the released state
  • FIG. 2 shows a second embodiment of the hydraulic brake according to the invention in a partial representation in the released state
  • FIG. 3 shows a sectional view along the dashed line in Fig.l with the electromagnet switched off.
  • the hydraulic vehicle brake according to the invention which is only partially shown in FIG. 1, has a brake housing 1 which encompasses the outer edge of a brake disk (not shown) and two brake linings (not shown).
  • the brake housing 1 forms on its inside a brake cylinder 3, which receives a brake piston 2 axially.
  • brake fluid can be supplied by means of a hydraulic connection, not shown, so that a brake pressure builds up, which axially displaces the brake piston 2 towards the brake disk, not shown.
  • a working memory 10, which is formed by a spring element 5, is provided between the brake piston 2 and a force-transmitting part 14 guided in the brake piston 2.
  • the brake pad facing the force-transmitting part 14 is pressed against the brake disk, the brake housing 1 shifting in response in the opposite direction and thereby also pressing the other brake pad against the brake disk.
  • the spring element 5 just mentioned is designed or preloaded such that it does not experience any compression during the service braking just described and prevents relative movements between the brake piston 2 and the force-transmitting part 14. As a result, the axial movement of the brake piston 2 is transmitted directly to the force-transmitting part 14 and there is no increased volume absorption of brake fluid compared to a conventional vehicle brake which has no working memory 10.
  • a locking device which is required to implement a parking brake function, is formed in the embodiment shown in Fig.l by a spindle gear or a threaded nut-spindle arrangement 8, which consists of a threaded nut 6 and a spindle 4, which is by means of a non-self-locking thread communicate with each other.
  • the threaded nut 6 is rigidly connected to the brake piston 2, while the spindle 4 is rotatably mounted at its end facing away from the brake piston 2 with a bearing 9 in the brake housing 1 and has a toothed circular component 11 which is arranged with a rotation-proof arrangement in the brake housing 1 Locking element 23 can be brought into and out of engagement.
  • the first embodiment of the hydraulic vehicle brake according to the invention is shown in FIG. 1 in the released state of the parking brake.
  • the parking brake is locked after a hydraulic one in the operating pressure chamber 7 Pressure was built up.
  • the pressure applied to carry out a parking brake operation is so high that the working memory 10 is loaded hydraulically.
  • the spring element 5 is compressed and the brake piston 2 executes a relative movement on the force-transmitting part 14 after the brake lining facing the force-transmitting part 14 is in contact with the brake disc.
  • both the spindle 4 and the circular component 11 connected to the spindle 4 execute a rotational movement.
  • the circular component 11 is locked by the locking element 23, which will be explained in more detail below with reference to FIG. 3.
  • the brake piston 2 is held in the cocked state. Due to the loaded working memory 10, it is achieved that the application force acting on the brake pads, not shown, is almost independent of thermally induced changes in length and influences in the area of the brake caliper.
  • a hydraulic pressure is built up in the operating pressure chamber 7, which relieves the pressure on the circular component 11, so that the locking element 23 can be disengaged.
  • the working memory 10 mentioned in connection with the first embodiment shown in FIG. 1 is arranged on the end of the brake cylinder 3 facing away from the brake disc.
  • a storage piston 24 is provided, which on the one hand delimits the operating pressure chamber 7 and on the other hand represents a support for the spring element 15.
  • the storage piston 24 has a bearing 19 for the spindle 4.
  • the applied pressure is in turn so high that the spring element 15 is compressed and the storage piston 24 is moved to the right in the drawing, which is not the case due to the design of the spring element 15 during service braking.
  • the spindle 4 which is rotatably mounted on the bearing 19, is also moved to the right and thereby performs a rotational movement.
  • the circular component 11 firmly connected to the spindle 4 has a radial collar 12 provided with teeth so that the locking element 23 can lock the spindle 4 in the position just described, after which the brake piston 2 is locked in the tensioned state.
  • FIG. 3 shows the top view of a sectional illustration along the broken line in FIGS. 1 or 2 of the vehicle brake according to the invention.
  • the circular component 11 fixedly connected to the spindle 4 has teeth which cooperate with the locking element 23. If the electromagnet 27 actuating the locking element 23 is de-energized, the locking element 23 is in engagement with the teeth of the circular component 11 and both the spindle 4 and the brake piston 2 rigidly connected to the threaded nut 6 are locked, as already described. In order to disengage the locking element 23 from the teeth of the circular component 11, the electromagnet 27 is energized. During the service braking and during the build-up of pressure to carry out a parking brake operation, the electromagnet is energized and the circular component 11 is not locked. During a parking brake operation, the electromagnet 27 is switched off and no electrical see energy needed.
  • a parking brake operation can be carried out with the hydraulic vehicle brake according to the invention in a particularly energy-saving manner and with particularly low actuation forces of the locking element 23.
  • the locking element 23 and the teeth of the circular component 11 can also be designed such that a movement of the circular component 11 in the direction that corresponds to a movement of the brake piston 2 towards the brake disc is also possible when the circular component 11 is engaged with the locking element 23. A movement in the opposite direction is not possible.
  • the circular component 11 has no teeth.
  • a non-positive connection in the form of friction between the locking element 23 and the circular component 11 is provided for locking the circular component 11.
  • a further auxiliary power source is connected to the electrical connection 18 of the electromagnet 27, which enables the parking brake device to be unlocked in an emergency.
  • a mechanical pulling element can be provided, which is connected to the locking element 23 and also enables a manual unlocking of the parking brake device in an emergency.
  • the spring element 5 described with reference to FIG. 1 and the spring element 15 described with reference to FIG. 2 can also be designed in the vehicle brake according to the invention, that the comparison of the compression path with the necessary force has a maximum.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

The invention relates to a hydraulic vehicle brake comprising a parking brake device, especially for motor vehicles, and a brake housing (1) containing a hydraulic operating pressure chamber (7) of a brake piston (2) provided with at least one brake lining. The parking brake device acts on the brake piston (2) and can be locked, in the tensioned state, by means of a locking device formed by a threaded nut spindle arrangement (8). The spindle of the threaded nut spindle arrangement (8) in the inventive hydraulic vehicle brake comprises a circular component (11) provided with teeth, said component co-operating with the electromagnetically actuatable stop element (23). In this way, a parking brake process can be carried out in an especially energy-saving manner and with especially small actuation forces of the stop element (23).

Description

Hydraulische FahrzeugbremseHydraulic vehicle brake

Die Erfindung betrifft eine hydraulische Fahrzeugbremse mit FestStellbremsvorrichtung, insbesondere für Kraftfahrzeuge, mit einem Bremsgehäuse, in dem ein hydraulischer Betriebsdruckraum von einem mindestens einen Bremsbelag aufweisenden Bremskolben begrenzt ist, wobei die Feststellbremsvorrichtung auf den Bremskolben wirkt und im zugespannten Zustand mittels einer Verriegelungsvorrichtung, die durch eine Gewindemutter-Spindel-Anordnung gebildet ist, verriegelbar ist .The invention relates to a hydraulic vehicle brake with a parking brake device, in particular for motor vehicles, with a brake housing in which a hydraulic operating pressure space is delimited by a brake piston having at least one brake pad, the parking brake device acting on the brake piston and in the applied state by means of a locking device which is activated by a Threaded nut-spindle arrangement is formed, can be locked.

Aus der WO 97/29292 ist eine kombinierte Betriebs- und Feststellbremse bekannt, die im hydraulisch zugespannten Zustand durch eine elektrisch betätigbare Verriegelungsvorrichtung mechanisch verriegelbar ist. Dabei wird die Verriegelungs- einrichtung im wesentlichen durch eine Gewindemutter- Spindel-Anordnung gebildet. Die Gewindemutter-Spindel- Anordnung wird verriegelt, indem ein Elektromagnet die eine erste Reibfläche aufweisende Gewindemutter entgegen einer Druckfeder gegen eine zweite Reibfläche, die am Bremsgehäuse abgestützt ist, zieht. Als weniger vorteilhaft sind bei der vorbekannten Fahrzeugbremse die zur Betätigung des Elektromagneten benötigten hohen Ströme, sowie die aufwendige Kabelführung des Elektromagneten anzusehen.A combined service and parking brake is known from WO 97/29292, which can be mechanically locked in the hydraulically applied state by an electrically actuated locking device. The locking device is essentially formed by a threaded nut-spindle arrangement. The threaded nut-spindle arrangement is locked in that an electromagnet pulls the threaded nut having a first friction surface against a compression spring against a second friction surface which is supported on the brake housing. The high currents required to actuate the electromagnet and the complex cable routing of the electromagnet are to be regarded as less advantageous in the known vehicle brake.

Es ist daher Aufgabe der vorliegenden Erfindung eine hydraulische Fahrzeugbremse mit Feststellbremsvorrichtung dahingehend zu verbessern, dass die Verriegelungsvorrichtung auf möglichst einfache und kostengünstige Weise realisiert wird.It is therefore an object of the present invention to improve a hydraulic vehicle brake with a parking brake device to the effect that the locking device is implemented in the simplest and cheapest possible way.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass die Spindel ein mit Zähnen versehenes kreisförmiges Bauteil auf- weist, das mit einem elektromagnetisch betätigbaren Arretierungselement zusammenwirkt .This object is achieved according to the invention in that the spindle has a circular component provided with teeth. has that cooperates with an electromagnetically actuated locking element.

Eine vorteilhafte Weiterbildung sieht vor, dass der das Arretierungselement betätigende Elektromagnet zwei Schaltpositionen aufweist, wobei das Arretierungselement mit den Zähnen des kreisförmigen Bauteils in Eingriff steht, wenn der Elektromagnet stromlos ist.An advantageous further development provides that the electromagnet actuating the locking element has two switching positions, the locking element being in engagement with the teeth of the circular component when the electromagnet is de-energized.

Zur Konkretisierung des Erfindungsgedankens ist vorgesehen, dass ein mit dem Bremskolben zusammenwirkender, hydraulisch ladbarer Arbeitsspeicher vorgesehen ist, der durch ein Federelement gebildet ist .To specify the concept of the invention, it is provided that a hydraulically loadable working memory which interacts with the brake piston and is formed by a spring element is provided.

Besonders vorteilhaft ist, wenn sich das Federelement am Bremskolben abstützt und auf ein kraftübertragendes Teil, das mit dem Bremsbelag in Verbindung steht, wirkt.It is particularly advantageous if the spring element is supported on the brake piston and acts on a force-transmitting part which is connected to the brake pad.

Eine weitere vorteilhafte Ausführungsform sieht vor, dass sich das Federelement an einem Speicherkolben abstützt, der in kraftübertragender Verbindung mit dem Bremskolben steht .A further advantageous embodiment provides that the spring element is supported on a storage piston which is in a force-transmitting connection with the brake piston.

Bei einer weiteren vorteilhaften Ausführung des Erfindungsgegenstandes ist das Federelement derart ausgelegt, dass es während Betriebsbremsungen keine Wegänderung erfährt. Besonders vorteilhaft ist es, wenn das Federelement derart ausgelegt ist, dass der Vergleich des Komprimierungsweges des Federelementes mit der dazu notwendigen Kraft ein Maximum aufweist .In a further advantageous embodiment of the subject matter of the invention, the spring element is designed in such a way that it does not change its path during service braking. It is particularly advantageous if the spring element is designed in such a way that the comparison of the compression path of the spring element with the force required for this has a maximum.

Außerdem ist eine Hilfsstromquelle oder ein mechanisches Zugelement zum Lösen der Feststellbremse im Notfall vorgesehen. Die Erfindung wird nachfolgend anhand von zwei Ausführungs- beispielen im Zusammenhang mit der beiliegenden Zeichnung näher erläutert. In der Zeichnung zeigen:In addition, an auxiliary power source or a mechanical pulling element is provided to release the parking brake in an emergency. The invention is explained in more detail below on the basis of two exemplary embodiments in conjunction with the accompanying drawing. The drawing shows:

Fig.l eine Teildarstellung im axialen Querschnitt einer ersten Ausführung der erfindungsgemäßen hydraulischen Fahrzeugbremse in gelöstem Zustand,1 shows a partial representation in the axial cross section of a first embodiment of the hydraulic vehicle brake according to the invention in the released state,

Fig.2 eine zweite Ausführung der erfindungsgemäßen hydraulischen Bremse in einer Teildarstellung in gelöstem Zustand,2 shows a second embodiment of the hydraulic brake according to the invention in a partial representation in the released state,

Fig.3 eine Schnittdarstellung entlang der gestrichelten Linie in Fig.l mit stromlos geschaltetem Elektromagnet .3 shows a sectional view along the dashed line in Fig.l with the electromagnet switched off.

Die in Fig.l lediglich teilweise dargestellte erfindungsgemäße hydraulische Fahrzeugbremse weist ein Bremsgehäuse 1 auf, welches den äußeren Rand einer nicht dargestellten Bremsscheibe und zwei nicht dargestellte Bremsbeläge umgreift. Das Bremsgehäuse 1 bildet auf seiner Innenseite einen Bremszylinder 3, der einen Bremskolben 2 axial verschiebbar aufnimmt. In den zwischen Bremszylinder 3 und Bremskolben 2 gebildeten Betriebsdruckraum 7 kann mittels eines nicht dargestellten hydraulischen Anschlusses Bremsflüssigkeit zugeführt werden, so dass sich ein Bremsdruck aufbaut, der den Bremskolben 2 axial zur nicht dargestellten Bremsscheibe hin verschiebt . Zwischen dem Bremskolben 2 und einem im Bremskolben 2 geführten kraftübertragenden Teil 14 ist ein Arbeitsspeicher 10 vorgesehen, der durch ein Federelement 5 gebildet ist. Durch die axiale Verschiebung des Bremskolbens 2 in Richtung der nicht dargestellte Brems- Scheibe wird der dem kraftübertragenden Teil 14 zugewandte Bremsbelag gegen die Bremsscheibe gedrückt, wobei als Reaktion das Bremsgehäuse 1 sich in der entgegengesetzten Richtung verschiebt und dadurch auch den anderen Bremsbelag gegen die Bremsscheibe drückt . Das eben erwähnte Federelement 5 ist derart ausgelegt bzw. vorgespannt, dass es während der eben beschriebenen Betriebsbremsung keine Komprimierung erfährt und Relativbewegungen zwischen dem Bremskolben 2 und dem kraftübertragenden Teil 14 verhindert . Dadurch wird die axiale Bewegung des Bremskolbens 2 direkt auf das kraftübertragende Teil 14 übertragen und es findet keine erhöhte Volumenaufnahme an Bremsflüssigkeit gegenüber einer herkömmlichen Fahrzeugbremse, die keinen Arbeitsspeicher 10 aufweist, statt .The hydraulic vehicle brake according to the invention, which is only partially shown in FIG. 1, has a brake housing 1 which encompasses the outer edge of a brake disk (not shown) and two brake linings (not shown). The brake housing 1 forms on its inside a brake cylinder 3, which receives a brake piston 2 axially. In the operating pressure space 7 formed between the brake cylinder 3 and the brake piston 2, brake fluid can be supplied by means of a hydraulic connection, not shown, so that a brake pressure builds up, which axially displaces the brake piston 2 towards the brake disk, not shown. A working memory 10, which is formed by a spring element 5, is provided between the brake piston 2 and a force-transmitting part 14 guided in the brake piston 2. Due to the axial displacement of the brake piston 2 in the direction of the brake, not shown Washer, the brake pad facing the force-transmitting part 14 is pressed against the brake disk, the brake housing 1 shifting in response in the opposite direction and thereby also pressing the other brake pad against the brake disk. The spring element 5 just mentioned is designed or preloaded such that it does not experience any compression during the service braking just described and prevents relative movements between the brake piston 2 and the force-transmitting part 14. As a result, the axial movement of the brake piston 2 is transmitted directly to the force-transmitting part 14 and there is no increased volume absorption of brake fluid compared to a conventional vehicle brake which has no working memory 10.

Eine Verriegelungsvorrichtung, die zur Realisierung einer Feststellbremsfunktion erforderlich ist, ist bei der in Fig.l dargestellten Ausführung durch ein Spindelgetriebe bzw. eine Gewindemutter-Spindel-Anordnung 8 gebildet, die aus einer Gewindemutter 6 sowie einer Spindel 4, die mittels eines nicht selbsthemmenden Gewindes miteinander in Verbindung stehen, besteht. Dabei ist die Gewindemutter 6 mit dem Bremskolben 2 starr verbunden, während die Spindel 4 an ihrem dem Bremskolben 2 abgewandten Ende mit einem Lager 9 drehbar im Bremsgehäuse 1 gelagert ist und ein mit Zähnen versehenes kreisförmiges Bauteil 11 aufweist das mit einem im Bremsgehäuse 1 verdrehgesichert angeordneten Arretierungselement 23 in und außer Eingriff bringbar ist.A locking device, which is required to implement a parking brake function, is formed in the embodiment shown in Fig.l by a spindle gear or a threaded nut-spindle arrangement 8, which consists of a threaded nut 6 and a spindle 4, which is by means of a non-self-locking thread communicate with each other. The threaded nut 6 is rigidly connected to the brake piston 2, while the spindle 4 is rotatably mounted at its end facing away from the brake piston 2 with a bearing 9 in the brake housing 1 and has a toothed circular component 11 which is arranged with a rotation-proof arrangement in the brake housing 1 Locking element 23 can be brought into and out of engagement.

Die erste Ausführung der erfindungsgemäßen hydraulischen Fahrzeugbremse ist in Fig. 1 in gelöstem Zustand der Feststellbremse dargestellt. Die Verriegelung der Feststellbremse erfolgt, nachdem im Betriebsdruckraum 7 ein hydraulischer Druck aufgebaut wurde. Der für die Durchführung eines Fest- stellbremsvorganges eingesteuerte Druck ist so hoch, dass der Arbeitsspeicher 10 hydraulisch geladen wird. Dabei wird das Federelement 5 komprimiert und der Bremskolben 2 vollzieht nach Anlage des dem kraftübertragenden Teil 14 zugewandten Bremsbelages an die Bremsscheibe eine Relativbewegung auf das kraftübertragenden Teil 14 zu. Während der Translationsbewegung des Bremskolbens 2 vollzieht sowohl die Spindel 4 als auch das mit der Spindel 4 verbundene kreisförmige Bauteil 11 eine Rotationsbewegung. Das kreisförmige Bauteil 11 wird durch das Arretierungselement 23, das nachfolgend anhand der Fig. 3 noch näher erläutert wird, arretiert . Dadurch wird der Bremskolben 2 im gespannten Zustand gehalten. Aufgrund des geladenen Arbeitsspeichers 10 wird erreicht, dass die auf die nicht dargestellten Bremsbeläge einwirkende Zuspannkraft von thermisch bedingten Längenänderungen und Einflüssen im Bereich des Bremssattels nahezu unabhängig ist. Zum Lösen der Feststellbremse wird im Betriebsdruckraum 7 ein hydraulischer Druck aufgebaut, der zur Entlastung des kreisförmigen Bauteils 11 führt, so dass das Arretierungselement 23 außer Eingriff gebracht werden kann.The first embodiment of the hydraulic vehicle brake according to the invention is shown in FIG. 1 in the released state of the parking brake. The parking brake is locked after a hydraulic one in the operating pressure chamber 7 Pressure was built up. The pressure applied to carry out a parking brake operation is so high that the working memory 10 is loaded hydraulically. The spring element 5 is compressed and the brake piston 2 executes a relative movement on the force-transmitting part 14 after the brake lining facing the force-transmitting part 14 is in contact with the brake disc. During the translational movement of the brake piston 2, both the spindle 4 and the circular component 11 connected to the spindle 4 execute a rotational movement. The circular component 11 is locked by the locking element 23, which will be explained in more detail below with reference to FIG. 3. As a result, the brake piston 2 is held in the cocked state. Due to the loaded working memory 10, it is achieved that the application force acting on the brake pads, not shown, is almost independent of thermally induced changes in length and influences in the area of the brake caliper. To release the parking brake, a hydraulic pressure is built up in the operating pressure chamber 7, which relieves the pressure on the circular component 11, so that the locking element 23 can be disengaged.

Bei der in Fig.2 dargestellten zweiten Ausführung der erfindungsgemäßen Fahrzeugbremse ist der im Zusammenhang mit der in Fig.l gezeigten ersten Ausführung erwähnte Arbeitsspeicher 10 an dem der Bremsscheibe abgewandten Ende des BremsZylinders 3 angeordnet. Dazu ist ein Speicherkolben 24 vorgesehen, der einerseits den Betriebsdruckraum 7 begrenzt und andererseits eine Abstützung für das Federelement 15 darstellt. Außerdem weist der Speicherkolben 24 ein Lager 19 für die Spindel 4 auf. Zur Durchführung eines Feststellbremsvorganges wird im Betriebsdruckraum 7 ein Druck aufgebaut und der mit dem Bremskolben 2 in Verbindung stehende Bremsbelag wird an die nicht dargestellte Bremsscheibe ge- presst. Der eingesteuerte Druck ist wiederum so hoch, dass das Federelement 15 komprimiert wird und der Speicherkolben 24 in der Zeichnung nach rechts bewegt wird, was durch die Auslegung des Federelements 15 bei Betriebsbremsungen nicht der Fall ist. Durch die Verschiebung des Speicherkolbens 24 in der Zeichnung nach rechts wird auch die am Lager 19 drehbar gelagerte Spindel 4 nach rechts verschoben und vollzieht dabei eine Rotationsbewegung. Das mit der Spindel 4 fest verbundene kreisförmige Bauteil 11 weist einen mit Zähnen versehenen radialen Kragen 12 auf, damit das Arretierungselement 23 die Spindel 4 in der eben beschriebenen Position arretieren kann, wonach der Bremskolben 2 im gespannten Zustand verriegelt ist.In the second embodiment of the vehicle brake according to the invention shown in FIG. 2, the working memory 10 mentioned in connection with the first embodiment shown in FIG. 1 is arranged on the end of the brake cylinder 3 facing away from the brake disc. For this purpose, a storage piston 24 is provided, which on the one hand delimits the operating pressure chamber 7 and on the other hand represents a support for the spring element 15. In addition, the storage piston 24 has a bearing 19 for the spindle 4. To carry out a parking brake operation, a pressure is built up in the operating pressure chamber 7 and that which is connected to the brake piston 2 The brake pad is pressed against the brake disc, not shown. The applied pressure is in turn so high that the spring element 15 is compressed and the storage piston 24 is moved to the right in the drawing, which is not the case due to the design of the spring element 15 during service braking. By moving the storage piston 24 to the right in the drawing, the spindle 4, which is rotatably mounted on the bearing 19, is also moved to the right and thereby performs a rotational movement. The circular component 11 firmly connected to the spindle 4 has a radial collar 12 provided with teeth so that the locking element 23 can lock the spindle 4 in the position just described, after which the brake piston 2 is locked in the tensioned state.

In Fig.3 ist die Draufsicht einer Schnittdarstellung entlang der gestrichelten Linie in den Fig.l oder 2 der erfindungs- gemäßen Fahrzeugbremse dargestellt. Das mit der Spindel 4 fest verbundene kreisförmige Bauteil 11 weist Zähne auf, die mit dem Arretierungselement 23 zusammenwirken. Ist der das Arretierungselement 23 betätigende Elektromagnet 27 stromlos geschaltet, so befindet sich das Arretierungselement 23 mit den Zähnen des kreisförmigen Bauteils 11 in Eingriff und sowohl die Spindel 4 als auch der mit der Gewindemutter 6 starr verbundene Bremskolben 2 sind, wie bereits beschrieben, arretiert. Um das Arretierungselement 23 mit den Zähnen des kreisförmigen Bauteils 11 außer Eingriff zu bringen wird der Elektromagnet 27 bestromt . Während der Betriebsbremsungen und während des Druckaufbaus zur Durchführung eines Feststellbremsvorganges wird der Elektromagnet bestromt und eine Arretierung des kreisförmigen Bauteils 11 findet nicht statt. Während eines Feststellbremsvorganges ist der Elektromagnet 27 stromlos geschaltet und es wird keine elektri- sehe Energie benötigt. Die Durchführung eines Feststell- bremsvorganges lässt sich mit der erfindungsgemäßen hydraulischen Fahrzeugbremse besonders energiesparend und mit besonders geringen Betätigungskräften des Arretierungselementes 23 realisieren.3 shows the top view of a sectional illustration along the broken line in FIGS. 1 or 2 of the vehicle brake according to the invention. The circular component 11 fixedly connected to the spindle 4 has teeth which cooperate with the locking element 23. If the electromagnet 27 actuating the locking element 23 is de-energized, the locking element 23 is in engagement with the teeth of the circular component 11 and both the spindle 4 and the brake piston 2 rigidly connected to the threaded nut 6 are locked, as already described. In order to disengage the locking element 23 from the teeth of the circular component 11, the electromagnet 27 is energized. During the service braking and during the build-up of pressure to carry out a parking brake operation, the electromagnet is energized and the circular component 11 is not locked. During a parking brake operation, the electromagnet 27 is switched off and no electrical see energy needed. A parking brake operation can be carried out with the hydraulic vehicle brake according to the invention in a particularly energy-saving manner and with particularly low actuation forces of the locking element 23.

Das Arretierungselement 23 und die Zähne des kreisförmigen Bauteils 11 können auch derart ausgebildet sein, dass eine Bewegung des kreisförmigen Bauteils 11 in derjenigen Richtung, die einer Bewegung des Bremskolbens 2 auf die Brems- Scheibe zu entspricht, auch dann möglich ist, wenn das kreisförmige Bauteil 11 mit dem Arretierungselement 23 in Eingriff steht. Eine Bewegung in die Gegenrichtung ist dagegen nicht möglich.The locking element 23 and the teeth of the circular component 11 can also be designed such that a movement of the circular component 11 in the direction that corresponds to a movement of the brake piston 2 towards the brake disc is also possible when the circular component 11 is engaged with the locking element 23. A movement in the opposite direction is not possible.

Eine andere Ausfuhrungsform sieht vor, dass das kreisförmige Bauteil 11 keine Zähne aufweist. Zur Arretierung des kreisförmigen Bauteils 11 ist in diesem Fall eine kraftschlüssige Verbindung in Form von Reibung zwischen dem Arretierungselement 23 und dem kreisförmigen Bauteil 11 vorgesehen.Another embodiment provides that the circular component 11 has no teeth. In this case, a non-positive connection in the form of friction between the locking element 23 and the circular component 11 is provided for locking the circular component 11.

Am elektrischen Anschluss 18 des Elektromagneten 27 ist zusätzlich zur Stromversorgung im Normalbetrieb eine weitere Hilfsstromquelle angeschlossen, die ein Entriegeln der Feststellbremsvorrichtung im Notfall ermöglicht. Außerdem kann ein, mechanisches Zugelement vorgesehen sein, das mit dem Arretierungselement 23 verbunden ist und eine manuelle Entriegelung der Feststellbremsvorrichtung im Notfall ebenfalls ermöglicht .In addition to the power supply in normal operation, a further auxiliary power source is connected to the electrical connection 18 of the electromagnet 27, which enables the parking brake device to be unlocked in an emergency. In addition, a mechanical pulling element can be provided, which is connected to the locking element 23 and also enables a manual unlocking of the parking brake device in an emergency.

Das anhand von Fig.l beschriebene Federelement 5 und das anhand von Fig.2 beschriebene Federelement 15 kann bei der erfindungsgemäßen Fahrzeugbremse auch derart ausgebildet sein, dass der Vergleich des Komprimierungsweges mit der dazu notwendigen Kraft ein Maximum aufweist. Bei der Verwendung einer hydraulischen Pumpe zum für den Feststellbremsvorgang notwendigen Druckaufbau hat dies zur Folge, dass die Messung des Stroms des Pumpenmotors ebenfalls ein Maximum aufweist. Wenn dieses Maximum erkannt wird, kann man auf ein komprimiertes Federpaket 5 bzw. 15 und damit auf einen ausreichenden Druckaufbau im Betriebsdruckraum 7 schließen. Auf Drucksensoren, die den Druckaufbau zur Durchführung eines Fest- stellbremsvorganges überwachen, kann somit verzichtet werden. The spring element 5 described with reference to FIG. 1 and the spring element 15 described with reference to FIG. 2 can also be designed in the vehicle brake according to the invention, that the comparison of the compression path with the necessary force has a maximum. When using a hydraulic pump to build up the pressure required for the parking brake operation, this means that the measurement of the current of the pump motor also has a maximum. If this maximum is recognized, one can infer a compressed spring assembly 5 or 15 and thus an adequate pressure build-up in the operating pressure chamber 7. Pressure sensors that monitor the build-up of pressure to carry out a parking brake operation can thus be dispensed with.

Claims

Patentansprüche claims 1. Hydraulische Fahrzeugbremse mit Feststellbremsvorrichtung, insbesondere für Kraftfahrzeuge, mit einem Bremsgehäuse, in dem ein hydraulischer Betriebsdruckraum von einem mindestens einen Bremsbelag aufweisenden Bremskolben begrenzt ist, wobei die Feststellbremsvorrichtung auf den Bremskolben wirkt und im zugespannten Zustand mittels einer Verriegelungsvorrichtung, die durch eine Gewindemutter-Spindel-Anordnung gebildet ist, verriegelbar ist, dadurch gekennzeichnet, dass die Spindel (4) ein mit Zähnen versehenes kreisförmiges Bauteil (11) aufweist, das mit einem elektromagnetisch betätigbaren Arretierungselement (23) zusammenwirkt .1.Hydraulic vehicle brake with a parking brake device, in particular for motor vehicles, with a brake housing in which a hydraulic operating pressure space is delimited by a brake piston having at least one brake pad, the parking brake device acting on the brake piston and in the applied state by means of a locking device which is provided by a threaded nut. Spindle arrangement is formed, can be locked, characterized in that the spindle (4) has a toothed circular component (11) which interacts with an electromagnetically actuated locking element (23). 2. Hydraulische Fahrzeugbremse nach Anspruch 1, dadurch gekennzeichnet, dass der das Arretierungselement (23) betätigende Elektromagnet (27) zwei Schaltpositionen aufweist, wobei das Arretierungselement (23) mit den Zähnen des kreisförmigen Bauteils (11) in Eingriff steht, wenn der Elektromagnet (27) stromlos ist.2. Hydraulic vehicle brake according to claim 1, characterized in that the electromagnet (27) actuating the locking element (23) has two switching positions, the locking element (23) being in engagement with the teeth of the circular component (11) when the electromagnet ( 27) is de-energized. 3. Hydraulische Fahrzeugbremse nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass ein mit dem Bremskolben (2) zusammenwirkender, hydraulisch ladbarer Arbeitsspeicher (10) vorgesehen ist, der durch ein Federelement (5, 15) gebildet ist.3. Hydraulic vehicle brake according to claim 1 or 2, characterized in that a with the brake piston (2) cooperating, hydraulically loadable working memory (10) is provided, which is formed by a spring element (5, 15). 4. Hydraulische Fahrzeugbremse nach Anspruch 3, dadurch gekennzeichnet, dass sich das Federelement (5) am Bremskolben (2) abstützt und auf ein kraftübertragendes Teil4. Hydraulic vehicle brake according to claim 3, characterized in that the spring element (5) is supported on the brake piston (2) and on a force-transmitting part (14), das mit dem Bremsbelag in Verbindung steht, wirkt. (14), which is connected to the brake pad, acts. 5. Hydraulische Fahrzeugbremse nach Anspruch 3, dadurch gekennzeichnet, dass sich das Federelement (15) an einem Speicherkolben (24) abstützt, der in kraftübertragender Verbindung mit dem Bremskolben (2) steht.5. Hydraulic vehicle brake according to claim 3, characterized in that the spring element (15) is supported on a storage piston (24) which is in force-transmitting connection with the brake piston (2). 6. Hydraulische Fahrzeugbremse nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Federelement6. Hydraulic vehicle brake according to one of the preceding claims, characterized in that the spring element (5, 15) derart ausgelegt ist, dass es während Betriebs- bremsungen keine Wegänderung erfährt .(5, 15) is designed in such a way that it does not change its path during service braking. 7. Hydraulische Fahrzeugbremse nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Federelement7. Hydraulic vehicle brake according to one of the preceding claims, characterized in that the spring element (5, 15) derart ausgelegt ist, dass der Vergleich des Kom- primierungsweges des Federelementes (5, 15) mit der dazu notwendigen Kraft ein Maximum aufweist .(5, 15) is designed such that the comparison of the compression path of the spring element (5, 15) with the force required for this has a maximum. 8. Hydraulische Fahrzeugbremse nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine Hilfsstromquelle zum Lösen der Feststellbremse im Notfall vorgesehen ist .8. Hydraulic vehicle brake according to one of the preceding claims, characterized in that an auxiliary power source is provided for releasing the parking brake in an emergency. 9. Hydraulische Fahrzeugbremse nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass ein mechanisches Zugelement zum Lösen der Feststellbremse im Notfall vorgesehen ist. 9. Hydraulic vehicle brake according to one of claims 1 to 7, characterized in that a mechanical tension element is provided for releasing the parking brake in an emergency.
PCT/EP2003/012092 2002-11-02 2003-10-30 Hydraulic vehicle brake Ceased WO2004041608A2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008003553A1 (en) * 2006-07-07 2008-01-10 Robert Bosch Gmbh Positive-fit freewheel mechanism that can be electromechanically actuated, electromechanical brake with a freewheel mechanism of this type for a motor vehicle and method for adjusting the play in a brake of this type
DE102005007808B4 (en) * 2005-02-21 2015-12-31 Robert Bosch Gmbh Operating and parking brake for a motor vehicle
DE102004060909B4 (en) 2004-12-17 2019-10-17 Robert Bosch Gmbh Locking device for the mechanical locking of a parking brake

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5148894A (en) * 1990-10-11 1992-09-22 Allied-Signal Inc. Disk brake/parking brake with threaded piston rod and motor
IT1245527B (en) * 1991-05-06 1994-09-29 Wabco Westinghouse Spa CALIPER FOR DISC BRAKING SYSTEMS WITH ELECTRO-HYDRAULIC CONTROL, PARTICULARLY FOR METROPOLITAN TRAMWAY VEHICLES.
DE19620344A1 (en) * 1996-02-09 1997-08-14 Teves Gmbh Alfred Combined service and parking brake system
DE19800643C2 (en) * 1998-01-09 2000-05-18 Siemens Ag Electrically operated service and parking brake for a motor vehicle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004060909B4 (en) 2004-12-17 2019-10-17 Robert Bosch Gmbh Locking device for the mechanical locking of a parking brake
DE102005007808B4 (en) * 2005-02-21 2015-12-31 Robert Bosch Gmbh Operating and parking brake for a motor vehicle
WO2008003553A1 (en) * 2006-07-07 2008-01-10 Robert Bosch Gmbh Positive-fit freewheel mechanism that can be electromechanically actuated, electromechanical brake with a freewheel mechanism of this type for a motor vehicle and method for adjusting the play in a brake of this type

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