+

WO1999022974A2 - Partie carter pour servofrein pneumatique - Google Patents

Partie carter pour servofrein pneumatique Download PDF

Info

Publication number
WO1999022974A2
WO1999022974A2 PCT/EP1998/006935 EP9806935W WO9922974A2 WO 1999022974 A2 WO1999022974 A2 WO 1999022974A2 EP 9806935 W EP9806935 W EP 9806935W WO 9922974 A2 WO9922974 A2 WO 9922974A2
Authority
WO
WIPO (PCT)
Prior art keywords
section
housing
brake cylinder
body wall
housing according
Prior art date
Application number
PCT/EP1998/006935
Other languages
German (de)
English (en)
Other versions
WO1999022974A3 (fr
WO1999022974A9 (fr
Inventor
Klaus Lind
Stephan Krebs
Original Assignee
Continental Teves Ag & Co. Ohg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Continental Teves Ag & Co. Ohg filed Critical Continental Teves Ag & Co. Ohg
Priority to EP98961121A priority Critical patent/EP1027238A2/fr
Publication of WO1999022974A2 publication Critical patent/WO1999022974A2/fr
Publication of WO1999022974A3 publication Critical patent/WO1999022974A3/fr
Publication of WO1999022974A9 publication Critical patent/WO1999022974A9/fr

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
    • B60T13/567—Vacuum systems indirect, i.e. vacuum booster units characterised by constructional features of the casing or by its strengthening or mounting arrangements

Definitions

  • the invention relates to a housing part for a pneumatic brake booster with the features of the preamble of claim 1.
  • Such a housing part is known for example from DE-OS 28 45 794.
  • the housing of the brake booster is made of thin sheet metal for weight reasons. Because this material thickness is not sufficient to reliably transfer braking reaction forces that occur during operation to a body wall, additional connecting bolts are provided. The connecting bolts are used for power transmission and thus at least partially replace the function of a housing with a thick wall.
  • pneumatic brake boosters deform due to the pressure difference between the ambient pressure and the negative pressure in a vacuum chamber delimited by a movable wall. It has now been shown that the operational behavior of brake boosters with particularly thin-walled housings, that is to say with housing wall thicknesses of a few tenths of a millimeter, for example below 0.8 mm, is unsatisfactory both without but in particular also with connecting bolts.
  • the loading of brake boosters with thin sheet metal material causes a deformation in the area of the attachment points of the master brake cylinder or in the area of the body wall the housing of the brake booster is attached.
  • stiffening disks in the area of the anchoring point, with which the housing is locally reinforced. Both the manufacture and installation of these stiffening washers is, however, prohibited for reasons of cost.
  • the embossing of beads in the housing part leads to an expensive, not rotationally symmetrical tool contour and therefore also to high costs.
  • the object of the present invention is therefore to provide a housing made of thin sheet metal for a brake booster which can withstand the forces occurring during operation under all circumstances and, in particular under the pressure load caused by the ambient pressure, has no tendency to vent the vacuum chamber.
  • the housing should also be easy to manufacture. This object is achieved with the characterizing features of claim 1 in that the contact surface (2) is spring-loaded completely or with at least one section (10) of the master brake cylinder and / or the body wall.
  • the contact surface on the master brake cylinder to be fastened or the body wall is correctly positioned in any case.
  • the solution to the problem is that the contact surface is in the fully assembled state under an elastic biasing force, which leads in particular to an increased sealing effect in the axial direction.
  • FIG. 1 side view of a housing part in section and on a smaller scale
  • FIG. 2 housing part fastened to a master brake cylinder flange on the scale as in FIG. 1;
  • Fig. 3 partially cut-away side view of a known, conventional brake booster housing with a master cylinder attached.
  • Fig. 1 shows a shell-shaped first housing part 1 for a brake booster.
  • a housing for a brake booster consists of two housing parts which are arranged opposite one another and have at least one movable wall in their interior, so that each housing part 1, together with the movable wall, delimits at least one pneumatic valve.
  • One of the two chambers, the so-called vacuum chamber, is permanently under vacuum in relation to the outside environment (and the pressure pu there).
  • the housing part 1 has at least one contact surface 2 for attachment to a flange 3 of a master brake cylinder 4 or a body wall.
  • the contact surface 2 is delimited by an opening 5, which serves for the passage of an actuating element, for example a control housing, and which is optionally guided in the radial direction on an annular collar 6.
  • an actuating element for example a control housing
  • the course of the cut in FIGS. 1 and 2 was chosen such that the fastening screws 7, 8 of the master brake cylinder 4 are visible.
  • the arrangement according to the invention also in a brake booster with stiffening bolts (Tie rod) is applicable. It is only conceivable, for example, that a tie rod is provided in each case at a location of a fastening screw 7, 8 and extends through the interior of the housing in the axial direction.
  • the contact surface 2 acts resiliently on the counter surface of the brake booster 4 or the body wall.
  • the contact surface 2 has a first section 9 and a second section 10, the first section 9 being arranged parallel to the flange 3 and at right angles to an axis 12 even before the master brake cylinder 4 is fastened.
  • the second section 10 stands for an axially resilient action on the master brake cylinder 4 or for an axially resilient action on the body wall to be fastened in the axial direction. It can also be seen that the two sections 9, 10 adjoin one another in the radial direction and, like the entire housing part 1 (with the exception of the bulge 11), are designed to be rotationally symmetrical to the axis 12.
  • the second section 10 is cranked in relation to the first section 9 in such a way that the edge 13 which projects furthest in the axial direction is axially aligned with the collar 6.
  • the angular connection of section 10 to collar 6 results in an increased spring rate.
  • the deflection of the section 10 in the assembled state results in improved guidance and sealing of the actuation supply member on the collar 6, because the same is pressed closer to the circumference of the actuator.
  • the second section 10 is bent at an obtuse angle () to the first section 9.
  • Fig. 2 shows the housing part 1 with an attached, only partially drawn master brake cylinder 4.
  • the section through the housing part 1 was chosen so that the fastening screws 7, 8 are visible.
  • the two sections 9, 10 lie flat on the housing part 1 after fastening the master brake cylinder 4, so that the second section 10, at least in the area of its edge 13, resiliently acts on a counter surface 14 in the axial direction.
  • a sealing element 15, for example in the manner of an O-ring is basically provided between the two contact surfaces, which is only indicated schematically in the drawing. It is essential that at least the most axially projecting edge 13 of the second section 10 rests axially resiliently against the master brake cylinder or the body wall, optionally with the interposition of the sealing element 15.
  • Fig. 3 shows a generally known, partially cut brake booster with two housing parts master brake cylinder 4 attached to it, the inner parts of the brake booster and the master brake cylinder, which are not of interest, being omitted for clarity. Accordingly, the features of the invention are not provided.
  • the vacuum chamber 21 delimited by the housing part 20 and the movable wall (not shown) is evacuated by means of the vacuum connection 22 and therefore there is a lower pressure inside than the ambient pressure pu.
  • the acting pressure difference which is also effective in the gap area of the contact surface 23, the contact surface 23 collapses, in particular in the area of the sealing element 24, so that this has no sealing contact with the counter-sealing surface 25 of the flange 26.
  • the collapse of the housing part 20 under the effect of the pressure difference leads to a reduction in the contact pressure of the sealing element 24 and, as a result, to a deteriorated sealing effect.
  • the invention is particularly suitable for use in motor vehicle brake boosters with a housing made of thin sheet material, that is to say with wall thicknesses below approximately 0.8 mm.
  • the invention is not limited to this, since multiple modifications of the invention in brake boosters with thicker sheet material are conceivable without departing from the basic idea of the invention.

Landscapes

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

Abstract

L'invention concerne un carter destiné à un servofrein, dans lequel notamment deux parties carter (1,-) se font face et délimitent au moins deux chambres pneumatiques. Au moins une surface d'appui (2) permet la fixation d'un maître-cylindre (4) ou bien d'un panneau de carrosserie sur la partie carter (1), et la surface d'appui (2) est délimitée par une ouverture (5) radialement vers l'intérieur. Dans le but d'assurer une fixation à demeure et étanche aux gaz du maître-cylindre ou du panneau de carrosserie, la surface d'appui (2) exerce une action de ressort sur le maître-cylindre et/ou le panneau de carrosserie en totalité ou avec au moins une section (10). Cette configuration permet d'obtenir au moindre coût une étanchéité, adaptée à chaque sollicitation en service, du servofrein par rapport à la pression ambiante (pu).
PCT/EP1998/006935 1997-11-03 1998-11-03 Partie carter pour servofrein pneumatique WO1999022974A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98961121A EP1027238A2 (fr) 1997-11-03 1998-11-03 Partie carter pour servofrein pneumatique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19748492.1 1997-11-03
DE1997148492 DE19748492A1 (de) 1997-11-03 1997-11-03 Gehäuseteil für einen pneumatischen Bremskraftverstärker

Publications (3)

Publication Number Publication Date
WO1999022974A2 true WO1999022974A2 (fr) 1999-05-14
WO1999022974A3 WO1999022974A3 (fr) 1999-07-29
WO1999022974A9 WO1999022974A9 (fr) 1999-09-10

Family

ID=7847446

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1998/006935 WO1999022974A2 (fr) 1997-11-03 1998-11-03 Partie carter pour servofrein pneumatique

Country Status (3)

Country Link
EP (1) EP1027238A2 (fr)
DE (1) DE19748492A1 (fr)
WO (1) WO1999022974A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6686465B2 (en) 2000-05-03 2004-02-03 Basf Aktiengesellschaft Preparation of cyclic lactams

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2481216A1 (fr) * 1980-04-25 1981-10-30 Dba Servo-moteur d'assistance au freinage a renfort de fixation
DE3401402C2 (de) * 1984-01-17 1993-09-30 Teves Gmbh Alfred Vakuumbremskraftverstärker
JP3214772B2 (ja) * 1994-01-25 2001-10-02 日信工業株式会社 負圧ブースタにおけるブースタシェルの補強構造
DE19528860A1 (de) * 1995-08-05 1997-02-06 Teves Gmbh Alfred Pneumatischer Brennkraftverstärker mit plastisch verformtem Gehäuse und Verfahren zu dessen Herstellung
DE29514063U1 (de) * 1995-09-01 1997-01-09 Lucas Industries P.L.C., Solihull, West Midlands Bremskraftverstärker/Hauptzylinder-Einheit mit Verbindungsbolzen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6686465B2 (en) 2000-05-03 2004-02-03 Basf Aktiengesellschaft Preparation of cyclic lactams

Also Published As

Publication number Publication date
WO1999022974A3 (fr) 1999-07-29
EP1027238A2 (fr) 2000-08-16
DE19748492A1 (de) 1999-07-15
WO1999022974A9 (fr) 1999-09-10

Similar Documents

Publication Publication Date Title
DE2845794C2 (de) Bremskraftverstärker
DE19907656A1 (de) Befestigung eines Luftfeder-Rollbalges an einem Stützteil
WO1999041122A1 (fr) Servofrein a depression
DE2908516A1 (de) Bremskraftverstaerker fuer ein kraftfahrzeug
EP3676132A1 (fr) Élément ressort pour la fixation d'un module de coussin gonflable à un volant de véhicule ainsi qu'ensemble volant pourvu dudit élément ressort
EP1993892B1 (fr) Servofrein pneumatique
EP1175323B1 (fr) Servofrein pneumatique
EP0565997B1 (fr) Frein à disque actionné par air comprimé
WO2012089186A2 (fr) Cylindre capteur
EP0681539B1 (fr) Servofrein a depression pour vehicules
EP1625060A2 (fr) Module boitier d'un frein assiste
WO1999007590A1 (fr) Dispositif de fixation d'un frein assiste
EP1841981B1 (fr) Frein a disque
EP1027238A2 (fr) Partie carter pour servofrein pneumatique
DE102005061353A1 (de) Pneumatischer Bremskraftverstärker
DE102016221024A1 (de) Schmutzschutz für Druckrauminnendurchmesser bei Kupplungsnehmerzylindern
DE102015209785A1 (de) Pneumatischer Bremskraftverstärker
EP1053154B1 (fr) Servofrein pour vehicules automobiles
EP1097071A2 (fr) Amplificateur de forces pneumatique du type tandem
DE102015223499A9 (de) Pneumatischer Bremskraftverstärker mit einem Verbindungsbolzen
WO2001056851A1 (fr) Cylindre de commande hydraulique pour vehicule
DE19915941A1 (de) Pneumatischer Bremskraftverstärker
DE4344188A1 (de) Unterdruck-Bremskraftverstärker
DE102011075348A1 (de) Pneumatischer Bremskraftverstärker
DE10308053A1 (de) Unterdruckbremskraftverstärker

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A2

Designated state(s): CZ US

AL Designated countries for regional patents

Kind code of ref document: A2

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE

121 Ep: the epo has been informed by wipo that ep was designated in this application
AK Designated states

Kind code of ref document: A3

Designated state(s): CZ US

AL Designated countries for regional patents

Kind code of ref document: A3

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE

AK Designated states

Kind code of ref document: C2

Designated state(s): CZ US

AL Designated countries for regional patents

Kind code of ref document: C2

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE

COP Corrected version of pamphlet

Free format text: PAGES 8-10, CLAIMS, REPLACED BY NEW PAGES 8-10; AFTER RECTIFICATION OF OBVIOUS ERRORS AS AUTHORIZEDBY THE INTERNATIONAL SEARCHING AUTHORITY

WWE Wipo information: entry into national phase

Ref document number: 1998961121

Country of ref document: EP

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
WWP Wipo information: published in national office

Ref document number: 1998961121

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 1998961121

Country of ref document: EP

点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载