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WO1997008033A1 - Unite d'actionnement pour systeme de freinage a regulation antipatinage et/ou a regulation de la tenue de route, et procede d'ajustement d'ecartement - Google Patents

Unite d'actionnement pour systeme de freinage a regulation antipatinage et/ou a regulation de la tenue de route, et procede d'ajustement d'ecartement Download PDF

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Publication number
WO1997008033A1
WO1997008033A1 PCT/EP1996/003737 EP9603737W WO9708033A1 WO 1997008033 A1 WO1997008033 A1 WO 1997008033A1 EP 9603737 W EP9603737 W EP 9603737W WO 9708033 A1 WO9708033 A1 WO 9708033A1
Authority
WO
WIPO (PCT)
Prior art keywords
push rod
master cylinder
piston
actuating unit
brake booster
Prior art date
Application number
PCT/EP1996/003737
Other languages
German (de)
English (en)
Inventor
Peter Volz
Hans-Dieter Reinartz
Erhard Beck
Georg Zentgraf
Original Assignee
Itt Automotive Europe Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Itt Automotive Europe Gmbh filed Critical Itt Automotive Europe Gmbh
Publication of WO1997008033A1 publication Critical patent/WO1997008033A1/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
    • B60T13/565—Vacuum systems indirect, i.e. vacuum booster units characterised by being associated with master cylinders, e.g. integrally formed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/48—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition connecting the brake actuator to an alternative or additional source of fluid pressure, e.g. traction control systems
    • B60T8/4809—Traction control, stability control, using both the wheel brakes and other automatic braking systems
    • B60T8/4827—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems
    • B60T8/4863—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems
    • B60T8/4872—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems pump-back systems
    • B60T8/4881—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems pump-back systems having priming means

Definitions

  • the invention relates to an actuation unit for a brake system with traction control and / or driving stability control, in particular with a vacuum brake booster and a main cylinder which can be charged with a precharge pressure, the vacuum brake booster having a push rod for transmitting the booster force to the master cylinder and one Valve device for opening or closing the connection between the vacuum chamber and the working chamber of the brake booster, and an elastic reaction disk being arranged between the valve piston and the pressure rod.
  • a reaction force is introduced into the vacuum brake booster, which acts on the reaction disc via the push rod, so that it deforms.
  • the reaction disk is biased in proportion to the precharge pressure. If the driver now intends to initiate braking, he must first overcome the pretension of the reaction disc, i.e. he has an unusual pedal feeling because the response forces become significantly greater.
  • the invention has for its object to provide an actuating unit of the type mentioned at the outset, in which the consequences for the response behavior resulting from the precharge pressure are largely eliminated, in particular a preload or deformation of the resultant force Reaction disc is prevented.
  • the movement of the relevant part of the amplifier is limited by the solution according to the invention, whereby a pretensioning or deformation of the reaction disk resulting from the precharge pressure is prevented in a surprisingly simple manner.
  • the actuation unit is relieved by the solution according to the invention.
  • the restrained part is the push rod piston of the master cylinder.
  • tie rod is supported on a connecting element connecting the two housing shells of the vacuum brake booster, in particular a so-called "tie rod”.
  • the adjustment of the play between the valve piston and the pressure rod takes place according to an expedient development of the invention by means of adjusted shims which are arranged between the pressure rod and the pressure rod piston of the master cylinder.
  • An intermediate element can be provided between the compensating disk or disks and the pressure rod, in particular a one-sided closed sleeve arranged in the pressure rod piston and into which the end of the pressure rod is immersed.
  • the invention also provides a method for adjusting the distance between the end of the push rod of the vacuum brake Power amplifier and its front housing wall, wherein the master cylinder is charged with the precharge pressure and then the position of the pressure rod piston is measured, and the position of the pressure rod is measured and finally a compensating disk corresponding to the measurements or a corresponding filler is inserted between the master cylinder piston and the pressure rod becomes.
  • FIG. 1 shows an actuation unit for a brake system with driving stability control, which has a vacuum brake booster and a tandem master cylinder in longitudinal section, parts of the actuation unit being broken away,
  • FIG. 2 shows another embodiment of an actuating unit in longitudinal section, parts of the actuating unit having broken away,
  • Figure 3 is a diagram of the course of the response force with and without precharging.
  • the merely schematically indicated booster housing 1 of the vacuum brake booster according to the invention shown in the drawing is divided by an axially movable wall 2 into a working chamber 3 and a vacuum chamber 4.
  • the axially movable wall 2 consists of a membrane plate 8 and a flexible membrane 18 lying thereon, which is not shown in detail between the outer circumference of the membrane plate 8 and the amplifier housing 1 as a rolling membrane Sealing forms.
  • the two housing halves 56, 57 of the amplifier housing are connected to one another via tie rods 80, 82, which are sealed through the membrane plate 8 and the membrane 18.
  • a control valve 12 which can be actuated by an actuating rod 7 (see FIG. 2) is accommodated in a control housing 5 which is guided in a sealed manner in the booster housing 1 and supports the movable wall 2 and consists of a first sealing seat 15 formed on the control housing 5, one on one with the actuating rod 7 connected valve piston 9 formed second sealing seat 16, and a valve body 10 cooperating with both sealing seats 15, 16, which is pressed against the valve seats 15, 16 by means of a valve spring 22 supported on a retaining ring 21.
  • the working chamber 3 can be connected to the vacuum chamber 4 via a channel 28 running laterally on the control housing 5.
  • the brake shaft is transmitted via a rubber-elastic reaction disk 6, which rests on the end face to the control housing 5, and a pressure rod 14, which has a head flange 23, to an actuating piston 52 of a master cylinder 54 of the brake system, which is attached to the vacuum-side booster housing half 56.
  • a return spring 26 shown schematically in the drawing (FIG. 2) which is supported on the vacuum-side end wall of the amplifier 1 on a flange (not shown), holds the movable wall 2 in the starting position shown.
  • a second compression spring 27 is provided, which is supported on the one hand on the actuating rod 7 and on the other hand on the retaining ring 21 and whose force ensures that the valve piston 9 or its valve seat 16 is preloaded with respect to the valve body 10.
  • a channel 29 is finally formed in the control housing 5.
  • the return movement of the valve piston 9 at the end of a braking process is limited by a cross member 11 which, in the release position of the vacuum brake booster shown in the drawing, bears against a stop 35 formed in the booster housing 1.
  • the push rod piston 52 of the master cylinder is supported on an element 66 arranged in the master cylinder housing with a projection 67 and via a transverse pin 66 arranged in a transverse passage 64, which also effects the opening of the central valve 72 via the valve tappet 73 from the seal holder 68 and is thus bound, or the movement path of the push rod piston 52 is limited thereby, so that the force resulting from the precharge cannot have an effect on the reaction disk 6.
  • the push rod 14 is tied up, specifically via an intermediate element 85 which extends radially outward from a projection 88 on the push rod to the tie rod 80 and extends via an intermediate piece 90 on a circumferential projection 88 of the tie rod 80 is supported.
  • the spring 26 is arranged radially outside the tie rods.
  • the rear end of the push rod piston 52 forms a cavity 56 which is open towards the push rod 14 of the vacuum brake booster.
  • an adjusting disk 58 At the bottom of the cavity 56 there is an adjusting disk 58 and, adjoining this, an intermediate element in the form of a sleeve 60 open on one side, the push rod of the vacuum brake booster being immersed in the sleeve.
  • the thickness of the Setting disc 58 is dimensioned so that there is practically no play between the end of the push rod 14 and the bottom of the sleeve 60.
  • the precharging pressure is applied to the master cylinder in the state separated from the brake booster and then the position of the push rod piston is measured. Furthermore, the distance between the front housing wall and the end of the push rod of the vacuum brake booster is measured.
  • at least one shim 58 and / or a sleeve 60 with a corresponding longitudinal dimension is inserted.
  • the pressure chamber 90 of the master cylinder can be charged with the precharge pressure by means of the pump 84, which is connected to the follow-up bore 92 of the master cylinder via a valve 89. Since the precharge pressure acts on the front side of the push rod piston 52 via the opened central valve 72, it tries to move it to the right in the drawing. As a result of the bondage, however, movement is not possible, so that the reaction disk is not deformed.
  • FIG. 3 shows the course of the response force of the actuation unit without pre-charging (line 0- 1-2-3) and in the case of a driving stability control process with pre-charging (line 4-5-2-3).

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Systems And Boosters (AREA)

Abstract

L'invention concerne une unité d'actionnement pour système de freinage à régulation antipatinage et/ou à régulation de la tenue de route, qui comporte un servofrein à dépression avec disque de réaction (6) et un maître-cylindre pouvant être sollicité par une pression de charge préliminaire. Afin d'éviter une précontrainte ou une déformation du disque de réaction (6) sous l'effet de la pression de charge préliminaire, il est prévu dans deux modes de réalisation différents qu'une partie (52, 14) de l'unité d'actionnement, sollicitée par la pression de charge préliminaire, soit bloquée. Dans un de ces modes de réalisation, il est également prévu un procédé d'ajustement de l'écart entre l'extrémité de la tige de poussée (14) du servofrein à dépression et ladite partie (52).
PCT/EP1996/003737 1995-08-25 1996-08-23 Unite d'actionnement pour systeme de freinage a regulation antipatinage et/ou a regulation de la tenue de route, et procede d'ajustement d'ecartement WO1997008033A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1995131317 DE19531317A1 (de) 1995-08-25 1995-08-25 Betätigungseinheit für eine Bremsanlage mit Antriebsschlupfregelung oder/und Fahrstabilitätsregelung
DE19531317.8 1995-08-25

Publications (1)

Publication Number Publication Date
WO1997008033A1 true WO1997008033A1 (fr) 1997-03-06

Family

ID=7770386

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/003737 WO1997008033A1 (fr) 1995-08-25 1996-08-23 Unite d'actionnement pour systeme de freinage a regulation antipatinage et/ou a regulation de la tenue de route, et procede d'ajustement d'ecartement

Country Status (2)

Country Link
DE (1) DE19531317A1 (fr)
WO (1) WO1997008033A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19753787A1 (de) * 1997-12-04 1999-06-24 Itt Mfg Enterprises Inc Bremskraftverstärker
FR2864504B1 (fr) * 2003-12-24 2006-03-17 Bosch Gmbh Robert Servomoteur de freinage a saut reglable et procede de reglage dudit servomoteur.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3337545A1 (de) * 1983-10-15 1985-04-25 Robert Bosch Gmbh, 7000 Stuttgart Hydraulische bremsanlage
DE3832722A1 (de) * 1988-09-27 1990-03-29 Bosch Gmbh Robert Bremsanlage
WO1992017357A1 (fr) * 1991-04-04 1992-10-15 Alfred Teves Gmbh Dispositif de freinage de vehicules a moteur a regulation de la pression de freinage en fonction du patinage au freinage et a l'entrainement
DE4128091A1 (de) * 1991-08-24 1993-02-25 Teves Gmbh Alfred Bremsanlage mit blockierschutz-und antriebsschlupfregelung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1208203B (it) * 1986-02-18 1989-06-12 Bendix Italia Complesso di servofreno adepressione.
DE3805218A1 (de) * 1987-08-25 1989-03-09 Teves Gmbh Alfred Bremsdruckregelvorrichtung
DE3913352A1 (de) * 1989-04-22 1990-10-25 Teves Gmbh Alfred Schlupfgeregelte hydraulische bremsanlage, insbesondere fuer kraftfahrzeuge
DE3923842A1 (de) * 1989-07-19 1991-01-24 Teves Gmbh Alfred Verfahren fuer den zusammenbau eines kolben-zylinderaggregats mit einem kraftuebertragungselement
DE4005584A1 (de) * 1990-02-22 1991-09-05 Teves Gmbh Alfred Betaetigungseinheit fuer eine blockiergeschuetzte kraftfahrzeugbremsanlage
DE4140066A1 (de) * 1991-12-05 1993-06-09 Alfred Teves Gmbh, 6000 Frankfurt, De Betaetigungseinheit fuer eine hydraulische bremsanlage
DE4211849A1 (de) * 1992-04-08 1993-10-14 Lucas Ind Plc Pneumatischer Bremskraftverstärker mit elektromagnetischer Hilfssteuerung, insbesondere für Kraftfahrzeuge

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3337545A1 (de) * 1983-10-15 1985-04-25 Robert Bosch Gmbh, 7000 Stuttgart Hydraulische bremsanlage
DE3832722A1 (de) * 1988-09-27 1990-03-29 Bosch Gmbh Robert Bremsanlage
WO1992017357A1 (fr) * 1991-04-04 1992-10-15 Alfred Teves Gmbh Dispositif de freinage de vehicules a moteur a regulation de la pression de freinage en fonction du patinage au freinage et a l'entrainement
DE4128091A1 (de) * 1991-08-24 1993-02-25 Teves Gmbh Alfred Bremsanlage mit blockierschutz-und antriebsschlupfregelung

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