WO2000030911A1 - Maitre-cylindre - Google Patents

Maitre-cylindre Download PDF

Info

Publication number
WO2000030911A1
WO2000030911A1 PCT/EP1999/009000 EP9909000W WO0030911A1 WO 2000030911 A1 WO2000030911 A1 WO 2000030911A1 EP 9909000 W EP9909000 W EP 9909000W WO 0030911 A1 WO0030911 A1 WO 0030911A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
piston
master cylinder
housing
cylinder according
Prior art date
Application number
PCT/EP1999/009000
Other languages
German (de)
English (en)
Inventor
Harald KÖNIG
Udo Jungmann
Andreas Bischoff
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
Publication of WO2000030911A1 publication Critical patent/WO2000030911A1/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
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/16—Master control, e.g. master cylinders
    • B60T11/20—Tandem, side-by-side, or other multiple master cylinder units
    • 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
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/16—Master control, e.g. master cylinders
    • B60T11/232—Recuperation valves

Definitions

  • the invention relates to a master cylinder, in particular a tandem master cylinder for hydraulic dual-circuit brake systems of motor vehicles, with a housing with a longitudinal bore for at least one piston guided therein, which works on at least one pressure chamber in the housing, and with at least one in a bore in the housing in the region of the pressure chamber Arranged valve which is opened to equalize pressure between the pressure chamber and a liquid container preferably connected to the bore when the piston is unloaded, and which is closed to build up pressure in the pressure chamber when the piston is loaded or acted upon.
  • Such a master cylinder is usually actuated by foot power and / or an auxiliary force, for example compressed air, vacuum, hydraulic pressure, etc.
  • an auxiliary force for example compressed air, vacuum, hydraulic pressure, etc.
  • the entire braking process of a motor vehicle is initiated and controlled via the master cylinder.
  • the piston of the master cylinder When the brake pedal is pressed, the piston of the master cylinder usually presses brake fluid, which is located in the brake system, into the associated disc brake or wheel cylinder.
  • the aforementioned bore which is arranged in the region of the pressure chamber and which is also referred to as a compensating bore in connection with a primary sleeve possibly provided on the piston, must be open when the brake is released, that is to say when the piston is relieved, in order to and to ensure pressure equalization in the brake system.
  • a liquid container usually connected to the bore and the pressure chamber is necessary because the (brake) liquid enclosed in the master cylinder, in the line network and in the actuating cylinders (disc brakes or wheel cylinders) is subject to influences which require a change in quantity and pressure .
  • a master cylinder of the structure described in the introduction has become known from the German designation 20 65 012.
  • a comparable embodiment is the subject of German specification 21 64 590.
  • Both of the above-described teachings have in common that the master cylinder has a relatively long construction, inter alia because the bore associated with a primary or push rod piston and the bore associated with a secondary or intermediate piston are far apart and consequently the or the liquid containers connected to it are constructed to extend.
  • the known master cylinders cannot satisfy their size, also with a view of a vacuum brake booster that is usually connected upstream. - The invention as a whole wants to remedy this.
  • the invention is based on the technical problem of developing a master cylinder of the construction described at the outset in such a way that a significant reduction in the overall length is achieved, in particular in combination with a vacuum brake booster.
  • the invention proposes in a generic master cylinder, in particular a tandem master cylinder for hydraulic dual-circuit brake systems of motor vehicles, that a piston-controllable and actuating element projecting over its end face is provided for the automatic opening and closing of the valve.
  • This actuating element can be a cylinder sleeve which is guided in the housing and released by the piston in the course of its action.
  • this actuating element has a front bevel for an actuating tappet that controls the valve and is generally supported on the housing with the interposition of a spring, the spring acting on the actuating element to close the valve when the piston is loaded.
  • the size of the housing of the master cylinder is first significantly reduced without changes to the dimensions of the push rod piston and intermediate piston are required. In essence, this can be attributed to the fact that the push rod piston can for the most part be arranged outside the housing and is no longer used directly to control the valve. Rather, a kind of indirect control is possible via the actuating element designed as a cylinder sleeve, because this protrudes over the end face of the piston.
  • the two bores for the primary and secondary circuit can be arranged in the immediate vicinity of one another, so that the liquid container generally connected to it can also be made compact.
  • the housing can have a relatively long insertion or installation area for a receiving bore of an upstream vacuum brake booster.
  • the overall size or overall length is significantly reduced, which not only brings advantages when installing and assembling with existing units, but also in terms of weight Terms is important. This is where the essential advantages of the invention can be seen.
  • the actuating element when the piston is relieved, rests with a bottom inner ring collar on a stop ring of the piston which overlaps the inner ring collar.
  • the stop ring moves away from the inner ring collar, releasing the actuating element.
  • the stop ring limits the stroke exerted by the spring supported on the housing on the actuating element. This is necessary so that the actuating element or the cylinder sleeve is at a defined distance from another piston guided in the longitudinal bore.
  • the configuration according to the invention can relate both to the primary or push rod piston and to the secondary or intermediate piston. Of course, cumulative configurations are also conceivable in which both the secondary and the primary piston have the described actuating element and associated valves are provided.
  • the spring already mentioned between the housing and the cylinder sleeve or the inner ring collar on the bottom side ensures a sensitive and tilt-free response of the valve tappet and thus the valve.
  • This is necessary because the linear movement of the cylinder sleeve in the axial direction of the longitudinal bore is generally converted into a vertical lifting and lowering movement of the valve lifter.
  • This preferably has a cross-shaped cross section with a foot-side overrun pin, a tappet plate connected to it and a head-side guide pin.
  • the aforementioned run-up pin works with the one already described Sloping ramp for converting the linear movement in question into the vertical movement together.
  • valve tappet plate which can be sealingly applied to the peripheral seal ensures reliable closure of the valve and thus of the bore.
  • the valve tappet plate can be hat-shaped and have a hat head that can be placed on the peripheral seal and a hat ring that is supported on the valve housing. This hat ring may have additional circumferential holes to ensure a rapid flow in the course of the pressure equalization when the valve is open.
  • the invention provides, according to a further preferred embodiment, that the valve housing is designed as a screw-in housing with an external thread. In this way, it is not only possible to achieve a problem-free assembly of the valve housing, but also a vertical alignment of the valve housing is possible.
  • the protrusion of the overrun pin into the housing can be varied and thus also the stroke of the valve tappet.
  • FIG. 1 shows a longitudinal section through a master cylinder according to the invention
  • FIG. 2 shows an enlarged detail from FIG. 1 in the region of the valve
  • FIG. 3 shows a second exemplary embodiment of the invention in longitudinal section and in the unactuated state
  • Figure 4 shows the second embodiment in longitudinal section and with a different cut
  • Figure 5 master cylinder of Figure 4 in the actuated state.
  • the figures show a master cylinder, a tandem master cylinder for a hydraulic dual-circuit brake system of a motor vehicle according to the exemplary embodiment.
  • this master cylinder has a housing 1 with a longitudinal bore 2 for at least one piston 3, 4 guided therein.
  • the pistons 3, 4 are a primary or push rod piston 3 as well as a secondary or intermediate piston 4.
  • Each of the two pistons 3, 4 works on an associated pressure chamber 5, 6.
  • the pressure chamber 5 belongs to the primary one Piston 3, while the secondary piston 4 acts on the pressure chamber 6.
  • Both pressure chambers 5, 6 are located in the housing 1, and are defined between a chamber bottom and the associated housing wall.
  • a valve 8 arranged in a bore 7 of the housing 1 in the region of the pressure chamber 5.
  • This valve 8 is opened for pressure equalization between the pressure chamber 5 and a liquid container 9 connected to the bore 7, specifically when the piston 3 is unloaded in the pressure chamber 5 when the piston 3 is loaded, the aforementioned valve 8 is closed.
  • the opening and closing movement of the valve 8 takes place via an actuating element 10, which projects beyond an end face 3a of the piston 3 and accordingly opens and closes the valve 8, specifically controlled by the piston 3.
  • the actuating element 10 is designed in detail as a cylindrical sleeve 10 which is guided in the housing 1 and supported on the housing 1.
  • the actuating element or the cylinder sleeve 10 has a front bevel 11 for a valve tappet 12 controlling the valve 8. Accordingly, a movement of the cylinder sleeve 10 in the axial direction H of the longitudinal bore 2 is converted into a corresponding vertical adjustment in the vertical direction V of the valve lifter 12.
  • the angle of the run-up slope 11 with respect to the axial or horizontal direction H influences the "transmission ratio" into the vertical movement in the vertical direction V.
  • the actuating element or the cylinder sleeve 10 is supported on the housing 1 with the interposition of a spring 13.
  • This spring 13 is, according to the exemplary embodiment, two disc springs resting against one another, which rest on a disk 14.
  • conventional helical springs (comparable to FIGS. 3 to 5) or corrugated washers or helical springs made of corrugated flat steel can also be used here Come into play.
  • This disc 14 is in turn a head-side component of a ring insert 15 of the housing 1, in which the piston 3 is guided in a sealing manner.
  • valve tappet 12 has a cross-shaped cross section with a foot-side run-up pin 12a, a tappet plate 12b connected to it and a head-side guide pin 12c.
  • Valve 8 is a valve housing 19 with a bottom bore 20 for the valve tappet 12 or run-up pin 12a guided therein.
  • the sealing function of the valve 8 is performed by a sealing ring 21 on the inside of the housing, which is held in the valve housing 19 by means of a support body 22.
  • This support body 22 This support body
  • the support body 22 or the sealing ring 21 has a guide bore 22 'for the valve lifter 12 or its guide pin 12c.
  • the support body 22 serves to receive a peripheral seal
  • This tappet plate 12b is hat-shaped and has a hat head 24 which can be attached to the peripheral seal 23 and a brim-like hat ring 25 which is supported on the valve housing 19.
  • openings 26 on the circumference are provided in the cap ring 25.
  • the valve housing 17 has a stop 27 adapted to the hat shape of the tappet plate 12b, on which a valve housing spring 28 stands and is supported with respect to the hat ring 25.
  • the valve housing 19 is a screw-in housing with an external thread 29. In this way, the valve housing 19 can be installed in a particularly simple manner. Such an external thread 29 also allows an adjustment in the vertical direction V in order to match the run-up pin 12 a and run-up slope 11 for a proper function of the valve 8.
  • the valve housing 19 is made of steel according to the exemplary embodiment, while the housing 1 of the master cylinder can be predominantly made of aluminum in order to achieve the greatest possible weight savings.
  • FIG. 1 it can be seen from FIG. 1 that, due to the actuating element 10 used according to the invention, a large part of the master cylinder or its housing 1 can be inserted or inserted into a vacuum brake booster, not shown. For example, the master cylinder shown can be inserted into such a brake booster up to an installation stop 30. This significantly reduces the overall size and provides a compact brake actuation module.
  • FIGS. 3 to 5 show a second embodiment of the invention. Corresponding components have the same reference numerals, and modified components are identified by the same reference numerals and '. 3 shows a sectional view to illustrate a valve 8 'assigned to the primary pressure chamber 5, while FIGS. 4 and 5 show a valve 8' 'assigned to the secondary pressure chamber 6.
  • the housing 1 ' has a bore 7' for a valve 8 'and is arranged parallel to a longitudinal bore 2' for guiding the piston 4.
  • the piston 3, which is decisive for the actuation of the valve 8 ', can be moved axially within a cylindrical guide of a cartridge-shaped housing part 1 a' provided concentrically with the bore 2 '.
  • the guide for the piston 3 has a smaller diameter than the bore 2 '.
  • the cartridge la ' is preferably made of sheet metal, which was formed in a deep-drawing process and punched to size, so that essentially only the housing part 1' is preferably made from a light metal material in a casting process.
  • the housing 1 ' has the longitudinal tion 2 'and the bore 7' in contrast to FIGS. 1 and 2 via a plurality of parallel longitudinal bores arranged at a distance from one another, which can be carried out inexpensively in one working and clamping process, for example with a multi-spindle boring machine. Even if the drawing shows that the (blind) bores 2 ', 7' are open on different sides, a further simplification of manufacture and assembly can be achieved by providing a uniform opening side (in particular in the direction of the cartridge 1 a ') is, so that the assembly of the pistons and their sealant, as well as the assembly of the valve 8 'together with accessories can be done from a single side within a single housing clamping.
  • valve 8, 8 ', 8''responsible for the respective brake circuit or parts thereof are aligned with a hydraulic connection 35 for a line or a (brake) fluid container and aligned with at least part the piston 4 is arranged.
  • Fig. 5 shows that even part of the piston 3 is aligned with part of the valve.
  • valve 8 'for the pressure chamber 5 acted upon by the piston 3 primary or pressure rod circuit
  • a valve 8''for the pressure chamber 6 acted on by the piston 4 secondary circuit
  • An actuating element 10 ensures that each valve 8', 8 '' is in the open position in the open position. remains, although the body of the valve 8, 8 ', 8''is under the pretensioning force of an elastic means, in particular a helical spring 36, and consequently fundamentally seeks to get into the closed position by contacting a valve seat 44.
  • the actuating means 10 'in the unactuated state of the master cylinder under tension is arranged between the piston 3 and the valve 8' in such a way that it exerts a preloading force on the valve stem 12 'of the valve 8' and retains it in the open position.
  • the retraction force is applied by return springs 46, 47, which basically serve to hold the pistons 3, 4 in an unactuated end position.
  • This movement in turn cancels the retraction function on the valve lifter 12 ', so that the elastic means 36 takes effect and forces the valve body to close.
  • the actuating element 10 comprises two relatively displaceable and socket-like components 37, 38 which are spaced apart from one another and are telescopic such that with increasing actuation there is an increasing shortening of the total length of the actuating element 10', and vice versa.
  • the maximum reduced overall length can be seen in FIG. 5.
  • the actuating element 10 ' is pushed into one another such that the remaining overall length is determined to a certain extent by the overall length of the longest bush 37, 38.
  • Each of the socket-shaped components 37, 38 has at least one positively acting driver element in the manner of a radial flange 40.
  • the (retraction) force transmission between piston 3 and valve lifter 12 ' takes place via the individual, functionally adjacent components with the aid of uniform, form-fitting driver elements, namely radial flanges 41, 42, 43 which act on the relevant functionally adjacent component .
  • at least one of the two sleeve-shaped components 37, 38 is preferably, as shown in the figure, guided in the region of the radial flange 42 on a wall 39 of the housing 1 a '.
  • Each valve 8 ' also includes a valve seat 44 which is fixedly supported in the bore 7' and is stationary with respect to the housing. To simplify assembly, it may be advisable to arrange the valve seat 44 firmly on a holding body 45 which can be screwed into the bore 7 ' or can be pressed in a pressure-tight manner.
  • a valve 8 ′′ for the secondary circuit is also to be provided, which is illustrated in FIG. 4 by using the same reference numbers and an identification by ′′.
  • an actuating element 10 ′′ assigned centrally to the piston 3 is responsible for actuating the two valves 8 ′ and 8 ′′.
  • the above invention is not only limited to the advantages already described, but also intervenes advantageously in other areas.
  • the above construction enables an improved suction of brake fluid from the brake fluid reservoir through the master brake cylinder, because the channel guide enables particularly low hydraulic resistances.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Of Braking Force In Braking Systems (AREA)

Abstract

L'invention concerne un maître-cylindre, notamment un maître-cylindre de frein tandem pour systèmes de freinage hydrauliques à double circuit d'automobiles. Ce maître-cylindre comprend dans sa structure de base un boîtier (1) à alésage oblong (2) pour au moins un piston (3, 4) guidé dedans. Ce piston (3, 4) agit sur au moins une chambre de pression (5, 6) dans le boîtier (1). Il est également prévu un clapet (1) monté dans un alésage (7) du boîtier (1), dans la zone des chambres de pression (5), qui s'ouvre lorsque le piston (3) est relâché, afin de compenser la pression entre la chambre de pression (5) et un réservoir de liquide (9) raccordé de préférence à l'alésage (7). Afin de former la pression dans la chambre de pression (5), lorsque le piston (3) est sollicité, ledit clapet (8) est fermé. Un élément d'actionnement (10) servant à ouvrir et à fermer le clapet (8) est associé au piston (3) et fait saillie au-dessus de la face avant (3a) dudit piston.
PCT/EP1999/009000 1998-11-24 1999-11-23 Maitre-cylindre WO2000030911A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1998154106 DE19854106A1 (de) 1998-11-24 1998-11-24 Hauptzylinder
DE19854106.6 1998-11-24

Publications (1)

Publication Number Publication Date
WO2000030911A1 true WO2000030911A1 (fr) 2000-06-02

Family

ID=7888793

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/009000 WO2000030911A1 (fr) 1998-11-24 1999-11-23 Maitre-cylindre

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DE (1) DE19854106A1 (fr)
WO (1) WO2000030911A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2193964A1 (fr) * 2008-12-05 2010-06-09 Robert Bosch GmbH Maitre cylindre de frein
DE102004057253C5 (de) * 2003-12-01 2014-01-09 Advics Co., Ltd. Hauptzylinder

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0014339D0 (en) * 2000-06-13 2000-08-02 Automotive Products Plc Vehicle clutches

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2065012A1 (de) 1968-06-14 1972-03-02 Girling Ltd , Tyseley, Birmingham, Warwick (Großbritannien) Hauptzylinder einer hydraulischen Bremsanlage, insbesondere fur Fahrzeuge Ausscheidung aus 2014890
DE2258947A1 (de) * 1971-12-03 1973-06-14 Bendix Corp Hauptzylinder fuer hydraulische zweikreissysteme, insbesondere fuer zweikreisbremssysteme
DE2164590A1 (de) 1971-12-24 1973-06-28 Teves Gmbh Alfred Hauptzylinder fuer eine zweikreisbremsanlage
US3879947A (en) * 1973-12-19 1975-04-29 Bendix Corp Master cylinder reservoir
DE3338252A1 (de) * 1983-10-21 1985-05-02 Alfred Teves Gmbh, 6000 Frankfurt Ventileinrichtung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2000187A (en) * 1932-10-17 1935-05-07 Hydraulic Brake Co Master cylinder

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2065012A1 (de) 1968-06-14 1972-03-02 Girling Ltd , Tyseley, Birmingham, Warwick (Großbritannien) Hauptzylinder einer hydraulischen Bremsanlage, insbesondere fur Fahrzeuge Ausscheidung aus 2014890
DE2258947A1 (de) * 1971-12-03 1973-06-14 Bendix Corp Hauptzylinder fuer hydraulische zweikreissysteme, insbesondere fuer zweikreisbremssysteme
DE2164590A1 (de) 1971-12-24 1973-06-28 Teves Gmbh Alfred Hauptzylinder fuer eine zweikreisbremsanlage
US3879947A (en) * 1973-12-19 1975-04-29 Bendix Corp Master cylinder reservoir
DE3338252A1 (de) * 1983-10-21 1985-05-02 Alfred Teves Gmbh, 6000 Frankfurt Ventileinrichtung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004057253C5 (de) * 2003-12-01 2014-01-09 Advics Co., Ltd. Hauptzylinder
EP2193964A1 (fr) * 2008-12-05 2010-06-09 Robert Bosch GmbH Maitre cylindre de frein
FR2939392A1 (fr) * 2008-12-05 2010-06-11 Bosch Gmbh Robert Maitre cylindre de frein

Also Published As

Publication number Publication date
DE19854106A1 (de) 2000-05-25

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