DE2639921A1 - Vacuum servo connected to inlet manifold - has flexible membrane movable between sealing lips and pressure control valve in vent line - Google Patents

Vacuum servo connected to inlet manifold - has flexible membrane movable between sealing lips and pressure control valve in vent line

Info

Publication number
DE2639921A1
DE2639921A1 DE19762639921 DE2639921A DE2639921A1 DE 2639921 A1 DE2639921 A1 DE 2639921A1 DE 19762639921 DE19762639921 DE 19762639921 DE 2639921 A DE2639921 A DE 2639921A DE 2639921 A1 DE2639921 A1 DE 2639921A1
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DE
Germany
Prior art keywords
valve
brake booster
vacuum
membrane
vacuum source
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.)
Granted
Application number
DE19762639921
Other languages
German (de)
Other versions
DE2639921C2 (en
Inventor
Hermann Seip
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
Alfred Teves 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 Alfred Teves GmbH filed Critical Alfred Teves GmbH
Priority to DE19762639921 priority Critical patent/DE2639921C2/en
Publication of DE2639921A1 publication Critical patent/DE2639921A1/en
Application granted granted Critical
Publication of DE2639921C2 publication Critical patent/DE2639921C2/en
Expired legal-status Critical Current

Links

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
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
    • B60T13/46—Vacuum systems
    • B60T13/52—Vacuum systems indirect, i.e. vacuum booster units

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Check Valves (AREA)
  • Braking Systems And Boosters (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

The brake servo (1) is linked to the inlet manifold (4) by a vacuum line and a control valve (2) which regulates the level of vacuum in the servo. A pressure control valve (5) can also be fitted in a venting line to the servo, to admit air when the vacuum level exceeds a set value. The system provides a smooth braking control especially for emission control vehicles, in which the vacuum level in the inlet manifold fluctuates. The valve may include a flexible membrane which moves between sealing lips.

Description

Mit Unterdruck betriebener Bremskraftverstärker Moderne Motoren mit Abgasentgiftung erzeugen beim Ansaugvorgang ein sehr unterschiedliches Vakuum, das je nach Beanspruchung des Motors zwischen 0,4 und 0,9 bar Unterdruck schwanken kann. Gleiches gilt für Vakuumpumpen mit sehr stark schwankender Leistung.Brake booster operated with vacuum Modern engines with Exhaust gas detoxification creates a very different vacuum during the intake process, the can fluctuate between 0.4 and 0.9 bar vacuum depending on the stress on the engine. The same applies to vacuum pumps with very strong fluctuations in performance.

Dies bringt insbesondere bei der Bremsauslegung große Schwierigkeiten mit sich, weil der Bremskraftverstarker auf den kleinsten Wert des Vakuums ausgelegt sein muß.This brings great difficulties, especially when designing the brakes with itself, because the brake booster is designed for the smallest value of the vacuum have to be.

Wird durch irgendeinen Betriebszustand das Maximum-Vakuum erreicht, dann~treten unzulässig hohe Betriebsdrücke im Bremssystem bei J3remsbetätigungauf0 Parallel hierzu nimmt die Fußkraft entsprechend ab, das heißt5 daß gleichzeitig mit dem unzulässig hohen Bremsdruck auch die Dosierbar keit, bestnders im unteren Druckbereich, verlorengeht.If the maximum vacuum is reached by any operating condition, then ~ inadmissibly high operating pressures occur in the brake system when the brake is applied At the same time, the foot strength decreases accordingly, i.e. at the same time with the inadmissibly high brake pressure also the controllability, constant in the lower Print area, is lost.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen mit Unterdruck betriebenen Bremskraftverstärker zu entwickeln, der für den kleinsten Wert des auftretenden Vakuums ausgelegt werden kann und dennoch bei höheren Vakua nicht zu unzulässig hohen Bremsdrücken führt.The present invention is based on the object of a vacuum to develop powered brake booster for the smallest value of the occurring Vacuum can be designed and yet not too impermissible at higher vacuums high brake pressures.

Diese Aufgabe wird erfindungsgemäß durch ein Ventil gelöst, durch das bei Gefahr eines unzulässig hohen Unterdrucks entweder die Verbindung zur Unterdruckquelle absperrbar oder aber eine Verbindung zur Außenluft zu öffnen ist. Durch diese Gestaltung ergibt es sich, daß bei einem unzulässig hohen Unterdruck der Vakuumquelle entweder die .Verbindung zwischen dem Ansaugkrummer des Motors und dem Bremskraftverstärker unmittelbar gesperrt wird oder aber Außenluft in die Arbeitskammer des Bremskraftverstärkers strömen kann, so daß sich dort das Vakuum nicht erhöht.According to the invention, this object is achieved by a valve If there is a risk of an impermissibly high negative pressure, either the connection to the negative pressure source can be shut off or a connection to the outside air is to be opened. Through this design it turns out that at an impermissibly high negative pressure of the vacuum source either the connection between the intake manifold of the engine and the brake booster is blocked immediately or outside air in the working chamber of the brake booster can flow so that the vacuum does not increase there.

Eine besonders vorteilhafte Ausgestaltung der Erfindung besteht darin, daß das Ventil eine axial bewegliche Membran hat, die durch ihre Elastizität oder eine Feder in Abstand von einem unterdruckquellenseitigen Ventilsitze gehalten ist, und daß in der Membran ein zum Bremskraftverstärker hin sperrendes Rückschlagventil angeordnet ist. Dabei kann das Rückschlagventil durch einen elastischen flanschartigen Teil der Membran und Öffnungen in der Membran gebildet sein. Diese Ausführungsform der Erfindung zeichnet sich durch besonders niedrige Herstellungskosten aus. Im Gehäuse des Ventils braucht lediglich ein Ventilsitz vorgesehen zu sein. Das Schließglied dieses Ventilsitzes und das komplette Rückschlagventil werden durch ein einziges leicht herstellbares Gummiteil gebildet.A particularly advantageous embodiment of the invention consists in that the valve has an axially movable membrane, which by its elasticity or a spring is held at a distance from a valve seat on the vacuum source side, and that in the membrane a check valve blocking the brake booster is arranged. The check valve can be provided with an elastic flange-like Part of the membrane and openings can be formed in the membrane. This embodiment the invention is characterized by particularly low manufacturing costs. in the The valve housing only needs to be provided with a valve seat. The closing link this valve seat and the complete check valve are through a single easily manufactured rubber part formed.

Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus der Zeichnung. Die einzelnen Figuren zeigen folgendes: Fig. 1 einen an einen Ansaugkrummer eines Ottomotors als Vakuumquelle angeschlossenen Bremskraftverstärker; Fig. 2 ein an den Bremskraftverstärker nach Fig. 1 anzuschließendes Ventil; Fig. 3 eine zweite Ausführungsform eines an den Bremskraftverstärker nach Fig. 1 anzuschließendes Ventil; Fig. 4 eine dritte Ausfunrungsform eines an den Bremskraftverstärker nach Fig. 1 anzuschließendenden Ventils; Fig. 5 eine vierte Aus führungs form eines an den Bremskraftverstärker nach Fig. 1 anzuschließenden Ventils.Further advantageous refinements of the invention emerge from the drawing. The individual figures show the following: Fig. 1 a Brake booster connected to an intake manifold of a gasoline engine as a vacuum source; FIG. 2 shows a valve to be connected to the brake booster according to FIG. 1; FIG. Fig. 3 a second embodiment of one to be connected to the brake booster according to FIG Valve; 4 shows a third embodiment of one of the brake booster according to Fig. 1 to be connected valve; 5 shows a fourth embodiment of a the brake booster according to Fig. 1 to be connected valve.

Die Fig. 1 zeigt einen Bremækraftverstärker 1, der über einen Anschluß 2 und eine Leitung 3 mit einem Ansaugkrümmer 4 eines Ottomotors Verbindung hat. Dieser Ansaug-Krümmer 4 stellt eine Vakuumquelle dar, durch die die Arbeitskammer im Bremskraftverstärker 1 evakuierbar ist.Fig. 1 shows a Bremækraftträger 1, which has a connection 2 and a line 3 with an intake manifold 4 of a gasoline engine connection. This intake manifold 4 represents a vacuum source through which the working chamber can be evacuated in the brake booster 1.

Am Gehäuse des Bremskrafiverstärkers 1 ist ein Ventil 5 angeordnet, welches in Fig. 2 vergrößert dargestellt ist und nunmehr unter Bezugnahme auf Fig. 2 beschrieben wird.A valve 5 is arranged on the housing of the braking power amplifier 1, which is shown enlarged in Fig. 2 and now with reference to Fig. 2 will be described.

Das Ventil 5 hat ein Gehäuse 6 mit einem Ventilsitz 7.The valve 5 has a housing 6 with a valve seat 7.

Gegen diesen Ventilsitz 7 ist ein als Ventilplatte ausgebildetes Schließglied 9 durch die Kraft einer Feder 8 gehalten.Against this valve seat 7 is a closing member designed as a valve plate 9 held by the force of a spring 8.

Wenn das Schließglied 9 vom Ventilsitz 7 abhebt, kann Luft über Kanäle 10 durch Luftfilter 11 in einen Arbeitsraum 12 des Bremskraftverstärkers 1 strömen.When the closing element 9 lifts off the valve seat 7, air can pass through channels 10 flow through air filter 11 into a working chamber 12 of brake booster 1.

Das in Fig. 3 dargestellte Ventil ist in die Verbindung zwischen dem Ansaugkrümmer 4 und dem Bremskraftverstärker zu schalten. Dabei muß der in der Zeichnung gesehen untere Teil des Ventils dem Ansaugkrümmer 4 zugewandt sein. Das Ventil nach Fig. 3 besteht aus einem Gehäuse 6, in dem ein unterdruckquellenseitiger Ventilsitz 13 und ein bremskraftverstärkerseitiger Ventilsitz 14 vorgesehen sind. Gegen den bremskraftverstärkerseitigen Ventilsitz 14 liegt ein Schließglied 15 an, welches aus einem elastischen Gummiteil besteht. Sobald vom Ansaugkrümmer 4 her Unterdruck zur Verfügung steht, hebt das Schließglied 15 von dem bremskraftverstärkerseitigen Ventilsitz 14 ab, so daß die Arbeitskammer 12 des Bremskraftverstärkers 1 evakuiert werden kann. Wird der Unterdruck jedoch plötzlich zu groß, was beispielsweise beim Wechsel des Fußes des Fahrers vom Gaspedal auf das Bremspedal der Fall ist, so entsteht im Ventil eine Draokdifferenz.The valve shown in Fig. 3 is in the connection between the To switch intake manifold 4 and the brake booster. The one in the drawing seen the lower part of the valve facing the intake manifold 4. The valve after Fig. 3 consists of a housing 6 in which a vacuum source-side valve seat 13 and a valve seat 14 on the brake booster side are provided. Against the Valve seat 14 on the brake booster side rests against a closing member 15, which consists of an elastic rubber part. As soon as there is negative pressure from the intake manifold 4 is available, the closing member 15 lifts from the brake booster side Valve seat 14 from so that the working chamber 12 of the brake booster 1 is evacuated can be. If the negative pressure suddenly becomes too great, for example with Change of the driver's foot from the accelerator pedal to the brake pedal is the case, so arises a pressure difference in the valve.

Dadurch setzt das Schließglied 15 auf den unterdruckquellenseitigen Ventilsitz 13 auf, so daß die Verbindung zwischen Ansaugkrümmer 4 und Bremskraftverstärker 1 versperrt ist.As a result, the closing member 15 relies on the vacuum source side Valve seat 13 so that the connection between the intake manifold 4 and the brake booster 1 is blocked.

Das in Fig. 4 dargestellte Ventil hat in einem Gehäuse 6 einen axial verschiebbaren Ventilkolben IG, der durch eine Dichtung 17 gegenüber dem Gehäuse 6 abgedichtet ist.The valve shown in Fig. 4 has in a housing 6 an axial displaceable valve piston IG, through a seal 17 with respect to the housing 6 is sealed.

Dieser Ventilkolben 16 ist gegen die Kraft einer Feder 18 gegen einen unterdruckquellenseitigen Ventilsitz 19 bewegbar. Im Ventilkolben 16 ist ein Rückschlagventil 20 gebildet,. welches aus Bohrungen 21 im Ventilkolben 16 und einer elastischen Scheibe 22 besteht, die in Ruhestellung gegen die Bohrungen 21 anliegt.This valve piston 16 is against the force of a spring 18 against one The valve seat 19 on the vacuum source side is movable. In the valve piston 16 is a check valve 20th educated,. which from bores 21 in the valve piston 16 and one elastic disk 22, which rests against the bores 21 in the rest position.

Bei dem Ausführungsbeispiel nach Fig. 5 ist der Ventilkolben 16 durch eine Membran 23 ersetzt. Diese Membran hat ebenfalls Durchlässe 24, gegen die ein elastischer flanschartiger Teil 25 der Membran 23 anliegt. Die Membran 23 ist ebenfalls gegen einen unterdruckquellenseitigen Ventilsitz 26 bewegbar. Durch ihre Elastizität wird sie aber in Ruhelage und bei nicht unzulässig hohem Unterdruck in Abstand von dem Ventilsitz 26 gehalten.In the embodiment of FIG. 5, the valve piston 16 is through a membrane 23 replaced. This membrane also has passages 24 against which a elastic flange-like part 25 of the membrane 23 is applied. The membrane 23 is also movable against a valve seat 26 on the vacuum source side. Because of their elasticity but in the rest position and if the negative pressure is not inadmissibly high, it is at a distance of the valve seat 26 held.

Claims (7)

Anspräche 9 Mit Unterdruck betriebener Bremskraftverstärker, g e k e n n z e i c h n e t durch ein Ventil (5), durch das bei Gefahr eines unzulässig hohen Unterdrucks entweder die Verbindung (3) zur Unterdruckquelle (Ansaugkrummer 4) absperrbar oder aber eine Verbindung zur Außenluft zu öffnen ist. Speeches 9 vacuum operated brake booster, g e not indicated by a valve (5), through which inadmissible if there is a risk of a high vacuum either the connection (3) to the vacuum source (intake manifold 4) can be shut off or a connection to the outside air can be opened. 2. Bremskrafiverstärker nach Anspruch 1, dadurch g e k e n n z e i c h n e t, daß das Ventil (5) als gegen die Kraft einer Feder (8) zur Arbeitskammer (12) des Bremskraftverstärkers (i) hin öffnendes Begrensungsventil ausgebildet und in eine Öffnung des Bremskraftverstärkers (1) eingesetzt ist.2. Braking power amplifier according to claim 1, characterized in that g e k e n n z e i c h n e t that the valve (5) as against the force of a spring (8) to the working chamber (12) of the brake booster (i) designed to open the limiting valve and is inserted into an opening of the brake booster (1). 3. Bremskraftverstärker nach Anspruch 1, dadurch g e -k e n n z e i c hn e t, daß das Ventil in die Verbindung (Leitung 3) zwischen Unterdruckquelle (Ansaugkrümmer 4) und Bremskraftverstärker (1) angeordnet ist und ein Schließglied (15) hat, welches gegen einen bremskraftverstärkerseitigen Ventilsitz (14) anliegt, bei Unterdruck zunächst abhebt, bei einem vorgegebenen Unterdruck jedoch gegen einen unterdruckquellenseitigen Ventilsitz (13) bewegbar ist.3. Brake booster according to claim 1, characterized in that g e -k e n n z e i c hn e t that the valve is in the connection (line 3) between the vacuum source (Intake manifold 4) and brake booster (1) is arranged and a closing member (15) which rests against a valve seat (14) on the brake booster side, initially lifts off at negative pressure, but against one at a given negative pressure The valve seat (13) on the vacuum source side is movable. 40 Bremskraftverstärker nach den Ansprüchen 1 oder 3, dadurch g e k e n n z e i c h n e t, daß das Schließglied (15) eine elastische Scheibe ist0 40 brake booster according to claims 1 or 3, characterized g e it is not indicated that the closing element (15) is an elastic disc0 5. Bremskraftverstärker nach den Ansprüchen 1 oder 3, dadurch g e k e n n z e i c h n e t, daß das Ventil einen axial verschiebbaren Ventilkolben (16) hat, der durch eine Feder (18) in Abstand von einem unterdruckquellenseitigen Ventilsitz (19) gehalten ist, und daß in dem Ventilkolben (16) ein zum Bremskraftverstärker (1) hin sperrendes Rückschlagventil (20) angeordnet ist.5. Brake booster according to claims 1 or 3, characterized g e k e n n z e i c h n e t that the valve has an axially displaceable valve piston (16) which by a spring (18) at a distance from a valve seat on the vacuum source side (19) is held, and that in the valve piston (16) to the brake booster (1) is arranged towards blocking check valve (20). 6. Bremskraftverstarker nach den Ansprüchen 1 oder 3, dadurch g e k e n n z e i c h n e t, daß das Ventil eine axial bewegliche Membran (23) hat, die durch ihre Elastizität oder eine Feder in Abstand von einem unterdruckquellenseitigen Ventilsitz (26) gehalten ist, und daß in der Membran (23) ein zum Bremskraftverstärker (1) hin sperrendes Ruckschlagventil (20) angeordnet ist oder das Rückschlagventil außerhalb der Membran (23) angeordnet ist.6. brake booster according to claims 1 or 3, thereby g e it is not indicated that the valve has an axially movable membrane (23), which by their elasticity or a spring at a distance from a vacuum source side Valve seat (26) is held, and that in the membrane (23) a to the brake booster (1) there is a non-return valve (20) blocking the valve or the non-return valve is arranged outside the membrane (23). 7. Bremskraftverstärker nach den Ansprüchen 1, 3 oder 6, dadurch g e k e n n z e i c h n e t, daß das Rückschlagventil (20) durch einen elastischen flanschartigen Teil (25) der Membran (23) und Öffnungen (24) in der Membran (23) gebildet ist07. Brake booster according to claims 1, 3 or 6, characterized in that g e k e n n n n z e i c h n e t that the check valve (20) by an elastic flange-like part (25) of the membrane (23) and openings (24) in the membrane (23) is formed0
DE19762639921 1976-09-04 1976-09-04 Valve for a vacuum-operated brake booster Expired DE2639921C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19762639921 DE2639921C2 (en) 1976-09-04 1976-09-04 Valve for a vacuum-operated brake booster

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762639921 DE2639921C2 (en) 1976-09-04 1976-09-04 Valve for a vacuum-operated brake booster

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DE2639921A1 true DE2639921A1 (en) 1978-03-09
DE2639921C2 DE2639921C2 (en) 1987-01-15

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3124153A1 (en) * 1980-06-20 1982-03-25 Nissan Motor Co., Ltd., Yokohama, Kanagawa "VACUUM SYSTEM FOR MOTOR VEHICLES"
EP0181487A1 (en) * 1984-11-05 1986-05-21 Allied Corporation Compact power brake actuation assembly
EP0230711A1 (en) * 1985-08-30 1987-08-05 General Motors Corporation Vacuum check valve assembly
FR2842155A1 (en) * 2002-05-16 2004-01-16 Luk Automobiltech Gmbh & Co Kg Vacuum limiting valve for motor vehicle's brake servo system breaks connection between servo unit and vacuum pump if set underpressure is achieved, with set underpressure acting upon piston against opening force of spring
FR2864501A1 (en) * 2003-12-24 2005-07-01 Bosch Gmbh Robert Pneumatic assistance servomotor for braking, has non-return valve that communicates front chamber with free air, where valve is maintained in closed position by atmospheric pressure
FR2903065A1 (en) * 2006-06-28 2008-01-04 Peugeot Citroen Automobiles Sa Motor vehicle braking system, has depression line connecting low pressure chamber to depression source, and depressurization valve connecting chamber with atmospheric pressure, when chamber has higher pressure than atmospheric pressure
WO2008003279A2 (en) * 2006-07-01 2008-01-10 Ixetic Hückeswagen Gmbh Vacuum pump, injection mold for said pump housing, method for the production of the pump housing, and method for the production of a pump housing comprising two seals produced in one operation
EP1967429A1 (en) * 2007-03-08 2008-09-10 ROBERT BOSCH GmbH Pneumatic servomotor for braking assistance including a check valve for evacuating excess internal pressure.
FR2935943A1 (en) * 2008-09-18 2010-03-19 Peugeot Citroen Automobiles Sa Brake device for motor vehicle, has brake amplifier comprising chamber connected to depression generating device by check valve, where check valve forms sub assembly provided with air filter that is placed in upstream of valve

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2119613A1 (en) * 1970-04-27 1971-11-18 Bendix Corp check valve

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2119613A1 (en) * 1970-04-27 1971-11-18 Bendix Corp check valve

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3124153A1 (en) * 1980-06-20 1982-03-25 Nissan Motor Co., Ltd., Yokohama, Kanagawa "VACUUM SYSTEM FOR MOTOR VEHICLES"
EP0181487A1 (en) * 1984-11-05 1986-05-21 Allied Corporation Compact power brake actuation assembly
EP0230711A1 (en) * 1985-08-30 1987-08-05 General Motors Corporation Vacuum check valve assembly
FR2842155A1 (en) * 2002-05-16 2004-01-16 Luk Automobiltech Gmbh & Co Kg Vacuum limiting valve for motor vehicle's brake servo system breaks connection between servo unit and vacuum pump if set underpressure is achieved, with set underpressure acting upon piston against opening force of spring
FR2864501A1 (en) * 2003-12-24 2005-07-01 Bosch Gmbh Robert Pneumatic assistance servomotor for braking, has non-return valve that communicates front chamber with free air, where valve is maintained in closed position by atmospheric pressure
FR2903065A1 (en) * 2006-06-28 2008-01-04 Peugeot Citroen Automobiles Sa Motor vehicle braking system, has depression line connecting low pressure chamber to depression source, and depressurization valve connecting chamber with atmospheric pressure, when chamber has higher pressure than atmospheric pressure
WO2008003279A2 (en) * 2006-07-01 2008-01-10 Ixetic Hückeswagen Gmbh Vacuum pump, injection mold for said pump housing, method for the production of the pump housing, and method for the production of a pump housing comprising two seals produced in one operation
WO2008003279A3 (en) * 2006-07-01 2008-03-13 Ixetic Hueckeswagen Gmbh Vacuum pump, injection mold for said pump housing, method for the production of the pump housing, and method for the production of a pump housing comprising two seals produced in one operation
EP1967429A1 (en) * 2007-03-08 2008-09-10 ROBERT BOSCH GmbH Pneumatic servomotor for braking assistance including a check valve for evacuating excess internal pressure.
FR2913390A1 (en) * 2007-03-08 2008-09-12 Bosch Gmbh Robert PNEUMATIC BRAKE ASSIST SERVOMOTOR COMPRISING AN ANCHOR RETURN VALVE FOR EVACUATING INTERNAL PRESSURE.
US7765913B2 (en) 2007-03-08 2010-08-03 Robert Bosch Gmbh Pneumatic brake booster comprising a nonreturn valve for discharging an internal overpressure
FR2935943A1 (en) * 2008-09-18 2010-03-19 Peugeot Citroen Automobiles Sa Brake device for motor vehicle, has brake amplifier comprising chamber connected to depression generating device by check valve, where check valve forms sub assembly provided with air filter that is placed in upstream of valve

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