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WO1997008033A1 - Actuating unit for a braking system with traction control and/or directional stability control and method for adjusting play - Google Patents

Actuating unit for a braking system with traction control and/or directional stability control and method for adjusting play Download PDF

Info

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)
French (fr)
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/en

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).

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

Abstract

The invention concerns an actuating unit for a braking system with traction control and/or directional stability control and comprising a vacuum brake booster with a reaction disc (6) and a master cylinder upon which pre-charging pressure acts. In order to prevent pretension or deformation of the reaction disc (6) owing to the pre-charging pressure, in two different embodiments it is provided that one part (52, 14) of the actuating unit upon which the pre-charging pressure acts, is fixed. In one of these embodiments a process is also carried out for adjusting the distance between the end of the vacuum brake booster thrust rod (14) and the part (52).

Description

BETÄTIGUNGSEINHEIT FÜR EINE BREMSANUGE MIT ANTRIEBSSCHLUPFREGELUNG UND/ODER FAHRSTABILITÄTSREGELUNG UND VERFAHREN ZUM EINSTELLEN DES SPIELSACTUATING UNIT FOR A BRAKE UNIT WITH DRIVE SLIP CONTROL AND / OR DRIVING STABILITY CONTROL AND METHOD FOR ADJUSTING THE GAME
Die Erfindung betrifft eine Betätigungseinheit für eine Brems¬ anlage mit Antriebsschlupfregelung oder/und Fahrstabilitäts- regelung, insbesondere mit einem Vakuumbremskraftverstärker und einem mit einem Vorladedruck beaufschlagbaren Hauptzylin¬ der, wobei der Vakuumbremskraftverstärker eine Druckstange aufweist zur Übertragung der Verstärkerkraft auf den Haupt¬ zylinder und eine Ventileinrichtung zum öffnen bzw. schließen der Verbindung zwischen der Vakuumkammer und der Arbeitskam¬ mer des Bremskraftverstärkers, und wobei zwischen dem Ventil¬ kolben und der Druckstange eine elastische Reaktionsscheibe angeordnet ist.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.
Bei einem Regelvorgang mit Vorladung in den Hauptzylinder wird eine Reaktionskraft in den Vakuumbremskraftverstärker einge¬ leitet, die über die Druckstange auf die Reaktionsscheibe wirkt, so daß sich diese verformt. Die Reaktionsscheibe wird bei diesem Vorgang dem Vorladedruck proportional vorgespannt. Beabsichtigt nun der Fahrer eine Bremsung einzuleiten, so muß er zunächst die Vorspannung der Reaktionsscheibe überwinden, d.h. er hat ein ungewohntes Pedalgefühl, da die Ansprechkräfte deutlich größer werden.In a control process with pre-charging into the master cylinder, a reaction force is introduced into the vacuum brake booster, which acts on the reaction disc via the push rod, so that it deforms. During this process, 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.
Der Erfindung liegt die Aufgabe zugrunde, eine Betätigungsein¬ heit der eingangs genannten Gattung zu schaffen, bei der die sich aus dem Vorladedruck ergebenden Folgen für das Ansprech¬ verhalten weitgehend eliminiert werden, insbesondere eine durch die resultierende Kraft bewirkte Vorspannung bzw. Ver¬ formung der Reaktionsscheibe verhindert wird.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.
ORIGINALUNTERLAGEN Diese Aufgabe wird erfindungsgemäß daurch gelöst, daß ein Teil der Betätigungseinheit das durch die aus dem Vorladedruck re¬ sultierende Kraft beaufschlagt wird, gefesselt ist.ORIGINAL DOCUMENTS This object is achieved according to the invention in that a part of the actuation unit which is acted upon by the force resulting from the precharge pressure is tied up.
Durch die erfindungsgemäße Lösung wird die Bewegung des be¬ treffenden Teils des Verstärkers begrenzt, wodurch auf überra¬ schend einfache Weise eine Vorspannung bzw. Verformung der Reaktionsscheibe resultierend aus dem Vorladedruck, verhindert wird. Damit ist während der Einbremsung in eine Fahrstabili- tätsregelung keine erhöhte Pedalkraft aufzubringen und es er¬ gibt sich kein verschlechtertes Pedalgefühl bei der Grundbrem¬ se. Ferner wird durch die erfindungsgemäße Lösung die Betäti¬ gungseinheit entlastet.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. This means that no increased pedal force is to be applied during braking into a driving stability control and there is no worsened pedal feeling with the base brake. Furthermore, the actuation unit is relieved by the solution according to the invention.
Gemäß einer vorteilhaften Ausführungsform der Erfindung ist das gefesselte Teil der Druckstangenkolben des Hauptzylinders.According to an advantageous embodiment of the invention, the restrained part is the push rod piston of the master cylinder.
Eine andere vorteilhafte Ausführungsform sieht vor, daß das gefesselte Teil sich an einem die beiden Gehäuseschalen des Vakuumbremskraftverstärkers verbindenden Verbindungselement, insbesondere einem sog. "Zuganker" abstützt.Another advantageous embodiment provides that the tied part is supported on a connecting element connecting the two housing shells of the vacuum brake booster, in particular a so-called "tie rod".
Die Einstellung des Spiels zwischen dem Ventilkolben und der Druckstange erfolgt gemäß einer zweckmäßigen Weiterbildung der Erfindung mittels angepaßter Ausgleichsscheiben, die zwischen der Druckstange und dem Druckstangenkolben des Hauptzylinders angeordnet sind. Hiebei kann zwischen der bzw. den Ausgleichs¬ scheiben und der Druckstange ein Zwischenelement vorgesehen sein, insbesondere eine im Druckstangenkolben angeordnete ein¬ seitig geschlossene Hülse, in die das Ende der Druckstange eintaucht.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.
Die Erfindung sieht auch ein Verfahren zur Einstellung des Abstandes zwischen dem Ende der Druckstange des Vakuumbrems- kraftverstärkers und dessen vorderer Gehäusewand vor, wobei der Hauptzylinder mit dem Vorladedruck beaufschlagt und danach die Position des Druckstangenkolbens gemessen und wobei die Position der Druckstange gemessen wird und schließlich eine den Messungen entsprechende Ausgleichsscheibe bzw. ein ent¬ sprechendes Füllstück zwischen Hauptzylinderkolben und Druck¬ stange eingefügt wird.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.
Weitere Merkmale und Vorteile der Erfindung sind in dem nach¬ folgenden Ausführungsbeispiel der Erfindung unter Bezugnahme auf die Zeichnung beschrieben.Further features and advantages of the invention are described in the following embodiment of the invention with reference to the drawing.
Es zeigen:Show it:
Figur 1 eine Betätigungseinheit für eine Bremsanlage mit Fahrstabilitätsregelung, die einen Vakuumbrems¬ kraftverstärker und einen Tandemhauptzylinder auf¬ weist im Längsschnitt, wobei Teile der Betätigungs¬ einheit weggebrochen sind,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,
Figur 2 eine andere Ausführungsform einer Betätigungseinheit im Längsschnitt, wobei Teile der Betätigungseinheit weggebrochen sind,FIG. 2 shows another embodiment of an actuating unit in longitudinal section, parts of the actuating unit having broken away,
Figur 3 ein Diagramm des Verlaufes der Ansprechkraft ohne und mit Vorladung.Figure 3 is a diagram of the course of the response force with and without precharging.
Das lediglich schematisch angedeutete Verstärkergehäuse 1 des in der Zeichnung dargestellten erfindungsgemäßen Unterdruck¬ bremskraftverstärkers ist durch eine axial bewegliche Wand 2 in eine Arbeitskammer 3 und eine Unterdruckkammer 4 unter¬ teilt. Die axial bewegliche Wand 2 besteht aus einem Membran¬ teller 8 und einer daran anliegenden flexiblen Membran 18, die nicht näher dargestellt zwischen dem äußeren Umfang des Mem¬ brantellers 8 und dem Verstärkergehäuse 1 eine Rollmembran alε Abdichtung bildet. Die beiden Gehäusehälften 56,57 des Ver¬ stärkergehäuses sind über durch den Membranteller 8 und die Membran 18 abgedichtet hindurchgeführte Zuganker 80,82 mitein¬ ander verbunden.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.
Ein durch eine Betätigungsstange 7 (siehe Fig. 2) betätigbares Steuerventil 12 ist in einem im Verstärkergehäuse 1 abgedich¬ tet geführten, die bewegliche Wand 2 tragenden Steuergehäuse 5 untergebracht und besteht aus einem am Steuergehäuse 5 ausge¬ bildeten ersten Dichtsitz 15, einem an einem mit der Betäti¬ gungsstange 7 verbundenen Ventilkolben 9 ausgebildeten zweiten Dichtsitz 16, sowie einem mit beiden Dichtsitzen 15,16 zusammenwirkenden Ventilkörper 10, der mittels einer sich an einem Haltering 21 abstützenden Ventilfeder 22 gegen die Ven¬ tilsitze 15,16 gedrückt wird. Die Arbeitskammer 3 ist mit der Unterdruckkammer 4 über einen seitlich am Steuergehäuse 5 ver¬ laufenden Kanal 28 verbindbar.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.
Die Bremskaft wird über eine stirnseitig am Steuergehäuse 5 anliegende gummielastische Reaktionsscheibe 6 sowie eine einen Kopfflansch 23 aufweisende Druckstange 14 auf einen Betäti¬ gungskolben 52 eines Hauptzylinders 54 der Bremsanlage über¬ tragen, der an der unterdruckseitigen Verstärkergehäusehälfte 56 angebracht ist.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.
Eine in der Zeichnung (Fig. 2) schematisch dargestellte Rück¬ stellfeder 26, die sich an der unterdruckseitigen Stirnwand des Verstärkers 1 an einem nicht gezeigten Flansch abstützt, hält die bewegliche Wand 2 in der gezeigten Ausgangsstellung. Außerdem ist eine zweite Druckfeder 27 vorgesehen, die einer¬ seits an der Betätigungsstange 7 und andererseits am Haltering 21 abgestützt ist und deren Kraft für eine Vorspannung des Ventilkolbens 9 bzw. seines Ventilsitzes 16 gegenüber dem Ven¬ tilkörper 10 sorgt. Um die Arbeitskammer 3 bei der Betätigung des Steuerventils 12 mit der Atmosphäre verbinden zu können, ist schließlich im Steuergehäuse 5 ein Kanal 29 ausgebildet. Die Rückkehrbewegung des Ventilkolbens 9 am Ende eines Bremsvorganges wird dabei durch ein Querglied 11 begrenzt, das in der in der Zeichnung gezeigten Lösestellung des Unterdruck-Bremskraftverstärkers an einem im Verstärkergehäuse 1 ausgebildeten Anschlag 35 an¬ liegt.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. In addition, 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. In order to be able to connect the working chamber 3 to the atmosphere when the control valve 12 is actuated, 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.
Bei der in Figur 1 dargestellten Ausführungsform stützt sich der Druckstangenkolben 52 des Hauptzylinders über einen in einem Querdurchgang 64 angeordneten Querstift 66, der auch die Öffnung des Zentralventils 72 über den Ventilstößel 73 be¬ wirkt, an im Hauptzylindergehäuse angeordneten Element 66 mit einem Vorsprung 67 und dem Dichtungshalter 68 ab und ist damit gefesselt bzw. der Bewegungsweg des Druckstangenkolbens 52 wird dadurch begrenzt, so daß die aus der Vorladung sich er¬ gebende Kraft sich nicht auf die Reaktionsscheibe 6 auswirken kann.In the embodiment shown in FIG. 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.
Bei der in Figur 2 dargestellten Ausführungsform ist die Druckstange 14 gefesselt und zwar über ein Zwischenelement 85, das sich von einem Vorsprung 88 an der Druckstange im wesent¬ lichen radiai nach außen zum Zuganker 80 erstreckt und sich über ein Zwischenstück 90 an einem umlaufenden Vorsprung 88 des Zugankers 80 abstützt. Die Feder 26 ist bei dieser Aus¬ führung radial außerhalb der Zuganker angeordnet.In the embodiment shown in FIG. 2, 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. In this embodiment, the spring 26 is arranged radially outside the tie rods.
Wie in Fig. 1 dargestellt bildet das hintere Ende des Druck¬ stangenkolbens 52 einen Hohlraum 56 der zur Druckstange 14 des Vakuumbremskraftverstärkers hin offen ausgeführt ist. Am Boden des Hohlraumes 56 ist eine Einstellscheibe 58 und, daran an¬ schließend ein Zwischenelement in Form einer einseitig offenen Hülse 60 angeordnet, wobei die Druckstange des Vakuumbrems- kraftverstärkers in die Hülse eintaucht. Die Dicke der Ein- Stellscheibe 58 ist so bemessen, daß sich zwischen dem Ende der Druckstange 14 und dem Boden der Hülse 60 praktisch kein Spiel ergibt. Zur Einstellung des Abstandes zwischen dem Ende der Druckstange 14 und der Wand der vorderen Gehäusehälfte 56 wird der Hauptzylinder im vom Bremskraftverstärker getrennten Zustand mit dem Vorladedruck beaufschlagt und dann die Posi¬ tion des Druckstangenkolbens vermessen. Ferner wird der Ab¬ stand zwischen der vorderen Gehäusewand und dem Ende der Druckstange des Vakuumbremskraftverstärkers gemessen. Entspre¬ chend den Messergebnissen wird zumindest eine Einstellscheibe 58 und/oder eine Hülse 60 mit entsprechender Längsabmessung eingelegt.As shown in FIG. 1, 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. 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. In order to adjust the distance between the end of the push rod 14 and the wall of the front housing half 56, 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. Corresponding to the measurement results, at least one shim 58 and / or a sleeve 60 with a corresponding longitudinal dimension is inserted.
Im Betrieb ist die Druckkammer 90 des HauptZylinders mittels der Pumpe 84, die über ein Ventil 89 mit der Nachlaufbohrung 92 des Hauptzylinders in Verbindung steht, mit dem Vorlade¬ druck beaufschlagbar. Da der Vorladedruck über das geöffnete- Zentralventil 72 auf die Vorderseite des Druckstangenkolbens 52 wirkt, versucht er diesen in der Zeichnung nach rechts zu bewegen. Infolge der Fesselung ist jedoch eine Bewegung nicht möglich, so daß eine Verformung der Reaktionsscheibe nicht stattfindet.In operation, 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.
Das in Figur 3 dargestellte Diagramm zeigt den Verlauf der Ansprechkraft der Betätigungseinheit ohne Vorladung (Linie 0- 1-2-3) und im Falle eines Fahrstabilitätsregelvorganges mit Vorladung (Linie 4-5-2-3). The diagram shown in 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).

Claims

Patentansprüche claims
Betätigungseinheit für eine Bremsanlage mit Antriebs¬ schlupfregelung oder/und Fahrstabilitätsregelung, mit einem Vakuumbremskraftverstärker und einem mit einem Vorladedruck beaufschlagbaren Hauptzylinder, wobei der Vakuumbremskraftverstärker eine Druckstange aufweist zur Übertragung der Verstärkerkraft auf den Hauptzylinder und eine Ventileinrichtung zum Öffnen bzw. Schließen der Verbindung des zwischen der Vakuumkammer und der Arbeitskammer des Bremskraftverstärkers, und wobei zwi¬ schen dem Ventilkolben und der Druckstange eine elasti¬ sche Reaktionsscheibe angeordnet ist, dadurch gekenn¬ zeichnet, daß ein Teil der Betätigungseinheit, der durch die aus dem Vorladedruck resultierende Kraft beauf¬ schlagbar ist, gefesselt ist.Actuating unit for a brake system with traction control and / or driving stability control, with a vacuum brake booster and a master cylinder to which a precharge pressure can be applied, the vacuum brake booster having a push rod for transmitting the booster force to the master cylinder and a valve device for opening or closing the connection between the Vacuum chamber and the working chamber of the brake booster, and wherein an elastic reaction disk is arranged between the valve piston and the push rod, characterized in that part of the actuation unit which can be acted upon by the force resulting from the precharge pressure is tied up is.
2. Betätigungseinheit nach Anspruch 1, dadurch gekennzeich¬ net, daß das gefesselte Teil die Druckstange (14) ist.2. Actuator according to claim 1, characterized gekennzeich¬ net that the bound part is the push rod (14).
3. Betätigungseinheit nach Anspruch 1, dadurch gekennzeich¬ net, daß das gefesselte Teil der Hauptzylinderkolben (52) Druckstangenkolben ist.3. Actuating unit according to claim 1, characterized gekennzeich¬ net that the shackled part of the master cylinder piston (52) is push rod piston.
4. Betätigungseinheit nach Anspruch 2, dadurch gekennzeich¬ net, daß der Druckstangenkolben (52) über ein Querglied (66) am Gehäuse des Hauptzylinders abgestützt ist.4. Actuating unit according to claim 2, characterized gekennzeich¬ net that the push rod piston (52) via a cross member (66) is supported on the housing of the master cylinder.
5. Betätigungseinheit nach Anspruch 3, dadurch gekennzeich¬ net, daß die Druckstange (14) an einem die beiden Gehäu¬ sehälften des Verstärkers verbindenden Zuganker (80) abgestützt ist.5. Actuator according to claim 3, characterized gekennzeich¬ net that the push rod (14) on one of the two housing halves of the amplifier connecting tie rod (80) is supported.
6. Betätigungseinrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß zwischen der Druckstange (14) und dem Druckstangenkolben (52) des Hauptzylinders zumindest ein Ausgleichselement (58,60) angeordnet ist.6. Actuating device according to one of the preceding claims, characterized in that at least one compensating element (58, 60) is arranged between the push rod (14) and the push rod piston (52) of the master cylinder.
7. Betätigungseinrichtung nach Anspruch 6, dadurch gekenn¬ zeichnet, daß das Ausgleichselement eine in einer Aus¬ nehmung des Druckstangenkolbens (52) angeordnete, ein¬ seitig geschlossene Hülse (60) ist.7. Actuating device according to claim 6, characterized in that the compensating element is a sleeve (60) which is arranged in a recess in the push rod piston (52) and is closed on one side.
8. Betätigungseinheit nach einem der vorhergehenden Ansprü¬ che, dadurch gekennzeichnet, daß der Hauptzylinder über ein Ventil (89) mit einer Vorladepumpe (84) verbunden ist.8. Actuating unit according to one of the preceding Ansprü¬ che, characterized in that the master cylinder is connected via a valve (89) to a precharging pump (84).
9. Verfahren zur Einstellung des Spiels zwischen dem Ende der Druckstange eines Bremskraftverstärkers einer Be¬ tätigungseinheit, insbesondere Vakuumbremskraftverstär¬ kers und dem Druckstangenkolben eines Hauptzylinders, wobei der Hauptzylinder der Betätigungseinheit mit einem Vorladedruck beaufschlagt und dann die Position des Druckstangenkolbens gemessen wird und wobei die Druck¬ stangenposition vermessen wird und eine den Messungen entsprechende Ausgleichsscheibe bzw. ein entsprechendes Füllstück zwischen Hauptzylinderkolben und Druckstange eingefügt wird. 9. A method for adjusting the play between the end of the push rod of a brake booster of an actuating unit, in particular a vacuum brake booster and the push rod piston of a master cylinder, the master cylinder of the actuating unit being charged with a precharge pressure and then the position of the push rod piston being measured and the pressure ¬ rod position is measured and a shim corresponding to the measurements or a corresponding filler between the master cylinder piston and the push rod is inserted.
PCT/EP1996/003737 1995-08-25 1996-08-23 Actuating unit for a braking system with traction control and/or directional stability control and method for adjusting play WO1997008033A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1995131317 DE19531317A1 (en) 1995-08-25 1995-08-25 Actuating unit for a brake system with traction control and / or driving stability control
DE19531317.8 1995-08-25

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

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WO (1) WO1997008033A1 (en)

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DE19753787A1 (en) * 1997-12-04 1999-06-24 Itt Mfg Enterprises Inc Device for amplification of force introduced via brake pedal or similar for operating work piston in main cylinder of hydraulic brake installation
FR2864504B1 (en) * 2003-12-24 2006-03-17 Bosch Gmbh Robert ADJUSTABLE JUMPING BRAKE SERVOMOTOR AND METHOD OF ADJUSTING THE SAME.

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DE3337545A1 (en) * 1983-10-15 1985-04-25 Robert Bosch Gmbh, 7000 Stuttgart HYDRAULIC BRAKE SYSTEM
DE3832722A1 (en) * 1988-09-27 1990-03-29 Bosch Gmbh Robert BRAKE SYSTEM
WO1992017357A1 (en) * 1991-04-04 1992-10-15 Alfred Teves Gmbh Motor vehicle braking system with brake slip and drive slip-dependent control of the braking pressure
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