FR2836440A1 - Pneumatic brake assistance servomotor has annular air-filled membrane between edge of partition and cylindrical housing wall - Google Patents

Pneumatic brake assistance servomotor has annular air-filled membrane between edge of partition and cylindrical housing wall Download PDF

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Publication number
FR2836440A1
FR2836440A1 FR0202443A FR0202443A FR2836440A1 FR 2836440 A1 FR2836440 A1 FR 2836440A1 FR 0202443 A FR0202443 A FR 0202443A FR 0202443 A FR0202443 A FR 0202443A FR 2836440 A1 FR2836440 A1 FR 2836440A1
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France
Prior art keywords
membrane
edge
skirt
partition
chamber
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Granted
Application number
FR0202443A
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French (fr)
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FR2836440B1 (en
Inventor
Bruno Beylerian
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Robert Bosch GmbH
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Robert Bosch GmbH
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Priority to FR0202443A priority Critical patent/FR2836440B1/en
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Application granted granted Critical
Publication of FR2836440B1 publication Critical patent/FR2836440B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • 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
    • B60T13/569—Vacuum systems indirect, i.e. vacuum booster units characterised by piston details, e.g. construction, mounting of diaphragm

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Systems And Boosters (AREA)

Abstract

The servomotor, comprising a rigid housing (1) with a cylindrical wall (10) and an inner mobile partition (3) dividing it into front and rear variable-volume chambers (21, 22), has the edge (310) of the partition separated from the cylindrical wall of the chamber by an annular gap (E) filled by a membrane (32). The membrane is in the form of an air-filled chamber (33) with a fold (330) that receives the partition edge, filling the gap between the partition and housing wall and able to roll relative to the wall when the partition moves. It also has at least one aperture (321) connecting it to the rear chamber (22).

Description

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La présente invention concerne, de façon générale, l'assistance pneumatique dont peuvent être dotés les systèmes de freinage hydraulique des véhicules automobiles.  The present invention relates, in general, to the pneumatic assistance with which hydraulic brake systems of motor vehicles can be fitted.

Plus précisément, l'invention concerne un servomoteur pneumatique d'assistance au freinage, comprenant une enveloppe rigide partiellement délimitée par une paroi cylindrique et divisée en des chambres avant et arrière de volumes respectifs variables et complémentaires par une cloison montée mobile en translation dans l'enveloppe sous l'effet d'une surpression à laquelle la chambre arrière est sélectivement soumise, la cloison mobile étant formée d'une jupe rigide et d'une membrane souple d'étanchéité accrochée à un bord de la jupe.  More specifically, the invention relates to a pneumatic brake booster, comprising a rigid envelope partially delimited by a cylindrical wall and divided into front and rear chambers of respective variable and complementary volumes by a partition mounted movable in translation in the casing under the effect of an overpressure to which the rear chamber is selectively subjected, the movable partition being formed of a rigid skirt and a flexible sealing membrane attached to an edge of the skirt.

Dans ce type de servomoteur bien connu, l'enveloppe rigide est faite de deux coquilles entre lesquelles la membrane, assimilable à une couronne, est prise son bord le plus externe alors que son bord le plus interne est fixé à la jupe.  In this type of well-known booster, the rigid envelope is made of two shells between which the membrane, similar to a crown, is taken at its outermost edge while its innermost edge is fixed to the skirt.

La chambre avant est généralement soumise en permanence à une pression inférieure à la pression atmosphérique alors que la chambre arrière est soumise à une pression contrôlée susceptible d'atteindre la pression atmosphérique, de sorte que la cloison mobile reçoit, par la surpression ainsi établie, une force d'assistance qui est utilisée pour compléter la force de freinage exercée par le conducteur du véhicule sur la pédale de frein.  The front chamber is generally permanently subjected to a pressure below atmospheric pressure while the rear chamber is subjected to a controlled pressure capable of reaching atmospheric pressure, so that the movable partition receives, by the overpressure thus established, a assist force which is used to supplement the braking force exerted by the driver of the vehicle on the brake pedal.

Bien que ces servomoteurs donnent toute satisfaction quant à leur fonctionnement, leur montage, et en particulier celui de la membrane, reste relativement délicat, donc également relativement long et coûteux.  Although these servomotors give full satisfaction with their operation, their mounting, and in particular that of the membrane, remains relatively delicate, therefore also relatively long and costly.

Dans ce contexte, la présente invention a pour but de proposer un servomoteur dont la membrane soit très facile à monter.  In this context, the present invention aims to provide a servomotor whose membrane is very easy to mount.

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A cette fin, le servomoteur de l'invention, par ailleurs conforme à la définition générique qu'en donne le préambule ci-dessus, est essentiellement caractérisé en ce que le bord de la jupe est séparé de la paroi cylindrique par un espace annulaire, en ce que la membrane forme une chambre à air annulaire, et en ce que la chambre annulaire ainsi formée comble de façon étanche l'espace annulaire entre la jupe et la paroi cylindrique, et roule au moins partiellement sur la paroi cylindrique lors de la translation de la jupe dans l'enveloppe.  To this end, the booster of the invention, moreover in accordance with the generic definition given in the preamble above, is essentially characterized in that the edge of the skirt is separated from the cylindrical wall by an annular space, in that the membrane forms an annular air chamber, and in that the annular chamber thus formed tightly fills the annular space between the skirt and the cylindrical wall, and rolls at least partially on the cylindrical wall during translation of the skirt in the envelope.

Dans le mode de réalisation préféré de l'invention, la chambre à air annulaire formée par la membrane présente un repli interne chevauchant le bord de la jupe et par lequel la membrane est assujettie au bord de la jupe.  In the preferred embodiment of the invention, the annular air chamber formed by the membrane has an internal fold overlapping the edge of the skirt and by which the membrane is secured to the edge of the skirt.

Enfin, pour prévenir tout glissement entre la membrane et la paroi cylindrique, la membrane peut être percée d'au moins un orifice établissant une communication entre la chambre arrière et la chambre à air annulaire formée par la membrane, pour permettre le gonflage de celle-ci.  Finally, to prevent any sliding between the membrane and the cylindrical wall, the membrane can be pierced with at least one orifice establishing communication between the rear chamber and the annular air chamber formed by the membrane, to allow inflation thereof. this.

D'autres caractéristiques et avantages de l'invention ressortiront clairement de la description qui en est faite ci-après, à titre indicatif et nullement limitatif, en référence à la figure unique annexée, qui est une vue en coupe partielle d'un servomoteur conforme à l'invention.  Other characteristics and advantages of the invention will emerge clearly from the description which is given below, by way of indication and in no way limiting, with reference to the single appended figure, which is a view in partial section of a servomotor conforming to the invention.

Comme annoncé précédemment, l'invention concerne un servomoteur pneumatique d'assistance au freinage, comprenant notamment une enveloppe rigide 1 et une cloison mobile 3.  As previously announced, the invention relates to a pneumatic brake booster, comprising in particular a rigid casing 1 and a movable partition 3.

L'enveloppe rigide 1, qui est partiellement délimitée par une paroi cylindrique 10, est divisée par la cloison mobile 3 en une chambre avant 21 et une chambre arrière 22, ces chambres ayant des volumes respectifs variables et complémentaires.  The rigid envelope 1, which is partially delimited by a cylindrical wall 10, is divided by the movable partition 3 into a front chamber 21 and a rear chamber 22, these chambers having respective variable and complementary volumes.

<Desc/Clms Page number 3> <Desc / Clms Page number 3>

La cloison mobile 3, qui est formée d'une jupe rigide 31 et d'une membrane souple d'étanchéité 32 accrochée à un bord 310 de la jupe 31, reçoit une force susceptible de la déplacer en translation dans l'enveloppe 1 lorsque la chambre arrière 22 est soumise à une pression supérieure à la pression régnant dans la chambre avant 21.  The movable partition 3, which is formed of a rigid skirt 31 and of a flexible sealing membrane 32 attached to an edge 310 of the skirt 31, receives a force capable of displacing it in translation in the envelope 1 when the rear chamber 22 is subjected to a pressure greater than the pressure prevailing in the front chamber 21.

Selon l'invention, la membrane 32 forme une chambre à air annulaire 33, qui comble de façon étanche un espace annulaire E ménagé entre le bord 310 de la jupe 31 et la paroi cylindrique 10, et qui roule au moins partiellement sur la paroi cylindrique 10 lors de la translation de la jupe 31 dans l'enveloppe 1.  According to the invention, the membrane 32 forms an annular air chamber 33, which sealingly fills an annular space E formed between the edge 310 of the skirt 31 and the cylindrical wall 10, and which rolls at least partially on the cylindrical wall 10 during the translation of the skirt 31 in the envelope 1.

Comme le montre la figure, la chambre à air annulaire 33 formée par la membrane 32 présente avantageusement un repli interne 330, qui chevauche le bord 310 de la jupe 31, et par lequel la membrane 32 est assujettie au bord 310 de la jupe 31.  As shown in the figure, the annular air chamber 33 formed by the membrane 32 advantageously has an internal fold 330, which overlaps the edge 310 of the skirt 31, and by which the membrane 32 is subject to the edge 310 of the skirt 31.

De préférence, la membrane 32 est aussi percée d'un ou plusieurs orifices, tels que 321, qui établissent une communication entre la chambre à air annulaire 33 formée par la membrane 32 et la chambre arrière 22 de ce servomoteur, et grâce auxquels la chambre à air annulaire 33 est toujours soumise à une pression au moins égale à celle qui règne dans la chambre avant 21. Preferably, the membrane 32 is also pierced with one or more orifices, such as 321, which establish a communication between the annular air chamber 33 formed by the membrane 32 and the rear chamber 22 of this servomotor, and by means of which the chamber air pressure 33 is always subjected to a pressure at least equal to that which prevails in the front chamber 21.

Claims (3)

REVENDICATIONS 1. Servomoteur pneumatique d'assistance au freinage, comprenant une enveloppe rigide (1) partiellement délimitée par une paroi cylindrique (10) et divisée en des chambres avant et arrière (21,22) de volumes respectifs variables et complémentaires par une cloison (3) montée mobile en translation dans l'enveloppe (1) sous l'effet d'une surpression à laquelle la chambre arrière (22) est sélectivement soumise, la cloison mobile (3) étant formée d'une jupe rigide (31) et d'une membrane souple d'étanchéité (32) accrochée à un bord (310) de la jupe (31), caractérisé en ce que le bord (310) de la jupe (31) est séparé de la paroi cylindrique (10) par un espace annulaire (E), en ce que la membrane (32) forme une chambre à air annulaire (33), et en ce que la chambre annulaire (33) ainsi formée comble de façon étanche l'espace annulaire (E) entre la jupe (31) et la paroi cylindrique (10), et roule au moins partiellement sur la paroi cylindrique (10) lors de la translation de la jupe (31) dans l'enveloppe (1). 1. Pneumatic brake booster, comprising a rigid casing (1) partially delimited by a cylindrical wall (10) and divided into front and rear chambers (21,22) of respective variable and complementary volumes by a partition (3 ) movably mounted in translation in the casing (1) under the effect of an overpressure to which the rear chamber (22) is selectively subjected, the movable partition (3) being formed of a rigid skirt (31) and d '' a flexible sealing membrane (32) attached to an edge (310) of the skirt (31), characterized in that the edge (310) of the skirt (31) is separated from the cylindrical wall (10) by a annular space (E), in that the membrane (32) forms an annular air chamber (33), and in that the annular chamber (33) thus formed fills sealingly the annular space (E) between the skirt (31) and the cylindrical wall (10), and rolls at least partially on the cylindrical wall (10) during the translation d e the skirt (31) in the envelope (1). 2. Servomoteur pneumatique suivant la revendication 1, caractérisé en ce que la chambre à air annulaire (33) formée par la membrane (32) présente un repli interne (330) chevauchant le bord (310) de la jupe (31) et par lequel la membrane (32) est assujettie au bord (310) de la jupe (31).  2. Pneumatic booster according to claim 1, characterized in that the annular air chamber (33) formed by the membrane (32) has an internal fold (330) straddling the edge (310) of the skirt (31) and by which the membrane (32) is secured to the edge (310) of the skirt (31). 3. Servomoteur pneumatique suivant la revendication 1 ou 2, caractérisé en ce que la membrane (32) est percée d'au moins un orifice (321) établissant une communication entre la chambre à air annulaire (33) formée par la membrane (32) et la chambre arrière (22). 3. Pneumatic booster according to claim 1 or 2, characterized in that the membrane (32) is pierced with at least one orifice (321) establishing communication between the annular air chamber (33) formed by the membrane (32) and the rear chamber (22).
FR0202443A 2002-02-25 2002-02-25 MEMBRANE SERVOMOTOR FORMING AN ANNULAR CHAMBER DEROULANTE Expired - Fee Related FR2836440B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR0202443A FR2836440B1 (en) 2002-02-25 2002-02-25 MEMBRANE SERVOMOTOR FORMING AN ANNULAR CHAMBER DEROULANTE

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FR0202443A FR2836440B1 (en) 2002-02-25 2002-02-25 MEMBRANE SERVOMOTOR FORMING AN ANNULAR CHAMBER DEROULANTE

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FR2836440A1 true FR2836440A1 (en) 2003-08-29
FR2836440B1 FR2836440B1 (en) 2006-12-15

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2864498A1 (en) * 2003-12-24 2005-07-01 Bosch Gmbh Robert Pneumatic servomotor`s case for vehicle, includes elastic membrane with two ends fixed to respective chambers, such that metallic skirt slides along membrane according to membrane`s movements

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1530912A1 (en) * 1964-01-17 1969-07-03 Kelsey Hayes Co Spring-assisted pressure medium drive
DE1480350A1 (en) * 1965-09-21 1969-10-02 Teves Gmbh Alfred Rod operated vacuum brake booster
US5716110A (en) * 1995-01-24 1998-02-10 Nippondenso Co., Ltd. Brake booster system including a power piston slidably supported by a resilient convolution chamber at its peripheral edge

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1530912A1 (en) * 1964-01-17 1969-07-03 Kelsey Hayes Co Spring-assisted pressure medium drive
DE1480350A1 (en) * 1965-09-21 1969-10-02 Teves Gmbh Alfred Rod operated vacuum brake booster
US5716110A (en) * 1995-01-24 1998-02-10 Nippondenso Co., Ltd. Brake booster system including a power piston slidably supported by a resilient convolution chamber at its peripheral edge

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2864498A1 (en) * 2003-12-24 2005-07-01 Bosch Gmbh Robert Pneumatic servomotor`s case for vehicle, includes elastic membrane with two ends fixed to respective chambers, such that metallic skirt slides along membrane according to membrane`s movements

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