WO1996022906A1 - Maitre-cylindre tandem - Google Patents

Maitre-cylindre tandem Download PDF

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Publication number
WO1996022906A1
WO1996022906A1 PCT/EP1996/000284 EP9600284W WO9622906A1 WO 1996022906 A1 WO1996022906 A1 WO 1996022906A1 EP 9600284 W EP9600284 W EP 9600284W WO 9622906 A1 WO9622906 A1 WO 9622906A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
piston
master cylinder
tandem master
cover
Prior art date
Application number
PCT/EP1996/000284
Other languages
German (de)
English (en)
Inventor
Klaus Bergelin
Heinrich Kreh
Harald KÖNIG
Udo Jungmann
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 WO1996022906A1 publication Critical patent/WO1996022906A1/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
    • B60T11/236—Piston sealing arrangements
    • 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

Definitions

  • the present invention relates to a tandem master cylinder according to the preamble of claim 1.
  • tandem master cylinder is known for example from GB 22 66 752.
  • container connections are made in the front area of the housing, a trailing bore is made in the wall of the housing parallel to the primary piston.
  • the object of the invention is therefore to propose a tandem master cylinder with a reduced overall volume, in particular with a smaller radial expansion, in order to meet the installation space requirements of today's motor vehicles and thereby to enable production that is as cheap or as inexpensive as possible.
  • the inwardly facing sections are advantageously radially inwardly deformed, originally axial projections of the housing, which have been deformed inwards by reeving or rolling in the housing edge and thereby encompass one or more radial projections of the cover, for example a step running around the outside thereof.
  • the housing can have a relatively small diameter in the front region thereof. This makes it relatively easy to edit, in particular the attachment of trailing bores from the connections to the interior of the housing is particularly simple since a radial borehole is possible in the rear, inaccessible area, while an oblique trailing borehole may only be provided in the more accessible front area becomes.
  • the secondary piston can only be guided in the cover if it has a bore of a suitable diameter and length.
  • Other components coming into contact with the outside of the secondary piston, for example seals, can be provided with radial play, so that it is also possible to dispense with a particularly precise axial alignment of the cover with respect to the housing.
  • Mounting the cover on the housing is so easy and inexpensive.
  • this measure makes it possible for secondary pistons of different diameters to be used with the same housing type, which only has to be provided with a cover of the corresponding diameter. In this way, a large variety of products can be achieved inexpensively with a large number of identical parts. Especially because the completely assembled housing can be manufactured consistently in large numbers.
  • the housing can advantageously be made in permanent mold casting.
  • a pressure connection for connecting the pressure chamber to a consumer, in particular a brake circuit is arranged in the cover, the housing and thus its production can be simplified.
  • the pressure connection can be attached laterally; if the cover is not axially projecting, an attachment to the front side is possible, for example centrally, i.e. coaxial to the housing axis.
  • a slight axial extension of the tandem master cylinder is offset by a radial space saving, which can be advantageous in the case of appropriate installation conditions.
  • the rear piston part of the primary piston of the tandem master cylinder according to the invention has a smaller diameter than a front piston part, which is provided with a sealing element and is guided directly into a bore in the housing, the rear part of the housing can be provided with such a piston particularly small diameter.
  • This allows either the connection of the rear part to a component with a small diameter receptacle or, with the housing still having a large diameter, the use of a material whose properties require a greater wall thickness, for example due to its lower mechanical strength.
  • aluminum instead of steel without increasing the outer diameter of the rear housing part, so that the tandem master cylinder can be connected to standard components, for example a brake booster, without the dimensions of the latter having to be changed.
  • Plastics can also be used inexpensively as housing material in this way.
  • Fig. La, lb a tandem master cylinder according to the invention.
  • FIG. La, lb A tandem master cylinder according to the invention is shown in Fig. La, lb, which are separated on the line 1 indicated by dashed lines.
  • the primary piston 3 and the secondary piston 4 of the same outside diameter are arranged in the housing 2 of FIG. 1 a, while the secondary piston 4 ′ of FIG. 1 has a smaller diameter than its primary piston 3.
  • the same components in FIGS. 1a and 1b are provided with the same reference numerals.
  • the rear part 5 of the primary piston 3 protrudes from a housing opening 6 of the housing 2 and has a recess
  • the front part of the primary piston 3 is provided with a cylindrical recess 8 and is guided in a sleeve 9.
  • the sleeve 9 is arranged in a recess 10 of the housing 2 and also serves to fix several. Sealing elements 16, 17.
  • a first pressure chamber 11 is formed by primary pistons 3, secondary pistons 4 and sleeve 9. It is via trailing bores 12 in the area of the cylindrical recess
  • the trailing space formed by the circumferential annular groove 13 and the recesses and bores of the sleeve 9 is sealed off from the outside space or the pressure space 11 by means of sealing sleeves 16, 17. If the primary piston 3 is moved to the left, the trailing bores 12 drive over the sealing sleeve 17 and thus interrupt the contact between the pressure chamber 11 and the trailing connection 15, so that a pressure can be built up.
  • the pressure chamber 11 is connected to a circuit of a brake system via a pressure connection 18.
  • the trailing space is also sealed off from the pressure space 11 via the sealing ring 19.
  • the secondary piston 4, 4 ' delimits a second pressure chamber 21, which is provided with a pressure connection 22 in its front region. Furthermore, the cover 20 has a bore 23, 23 'in which the secondary piston 4,4 'is guided and an axial groove 24, which ensures a pressure medium connection from the pressure chamber 21 to the pressure connection 22 in each piston position.
  • the secondary piston 4, 4 ' also has trailing bores 12' which connect the pressure chamber 21 to a trailing bore by 25.
  • the Nachlaufr around 25 is formed in a bushing 26 which are connected to the trailing connection 28 via a trailing bore 27. Bushing 26 and thus trailing space 25 is sealed via sealing sleeves 29, 30 and sealing ring 31 against pressure spaces 11, 21 or the outside space.
  • the cover 20 has on its outside a radial projection 32, which is surrounded by a radially inwardly pointing section 33 of an axial projection 34 of the housing 2. As a result, the cover 20 is fastened to the housing 2 and the opening 35 is closed.
  • the piston 4 'of FIG. 1b has a smaller outer diameter than the secondary piston 4 of FIG. 1a, the same applies accordingly to the inner diameter of the bore 23' or 23.
  • the bushing 26 ' has a correspondingly smaller inner diameter than the bushing 26, the same applies to the sealing collar 29 'and 29.
  • the sealing collar 30' has a smaller diameter overall than the sealing collar 30. Further components need not be changed to represent a master cylinder with secondary pistons 4 'of reduced diameter in relation to the primary piston 3.
  • a spring 36 is arranged in the pressure chamber 21 and a spring 37 in the pressure chamber 11, the spring 37 according to FIG Restraining sleeves 38, 39 and a restraining element 40 is restrained, while according to FIG. This
  • Design variants are independent of the use of a secondary piston 4 or 4 'of the same or different diameter with respect to the primary piston 3. They have the advantage of simpler assembly, since secondary pistons 4 or 4' can be preassembled with spring 37 ', which means that the number the assemblies to be assembled decreases.
  • the primary piston 3 has at its front end a circumferential projection 42 which comes into contact with the sleeve 9 and prevents the primary piston 3 from being pushed out of the housing 2 via its rearward position.
  • FIG. 2 shows a tandem master cylinder according to the invention, from the housing 42 of which a rear piston part 45 of the primary piston 43 protrudes.
  • the rear piston part 45 has a smaller diameter than the front piston part 52.
  • the piston part 52 is provided with a sealing element 48, by means of which it is sealed against a bore 53 of the housing 42. Piston part 52 is guided directly in the bore 53.
  • the rear piston part 45 protrudes from a housing opening 46 which has the same or slightly larger diameter than this.
  • the primary piston 43 is sealed off from the outside by means of a sealing collar 47, which is held in the housing 42 by means of a support ring 57.
  • a stop disk 58 fastened in the bore 53 serves the primary piston 43 as a stop in its reset position and, on the other hand, prevents the sealing sleeve 47 from moving.
  • a first pressure chamber 61 is delimited in the bore 53 by the primary piston 43 on the one hand and a secondary piston 44 on the other hand.
  • the secondary piston 44 is also guided in the bore 53 and sealed by means of sealing sleeves 49, 50.
  • it delimits a second pressure chamber 51 which, on the other hand, is delimited by a cover 60 closing in the opening 55 of the housing 42.
  • the cover 60 is fastened in the housing 42 by means of a thread 59 and sealed by means of a sealing element 68.
  • the pressure chamber 51 is provided with a pressure connection 69 and is connected to a container connection 63 via a central valve 62, which is known per se and is arranged in the secondary piston 44.
  • Another container connection 64 is connected to the first pressure chamber 61 via a trailing bore 65 known per se.
  • compression springs 56, 66 are arranged to return the pistons 43, 44 to their starting position.
  • the area 47 of the tandem master cylinder provided with the housing opening 46 has a small outside diameter, since on the one hand the rear piston part 45 is designed with a reduced outside diameter compared to the front piston part 42 and no increased wall thickness is required in the area 67, as a possible stop by a Forces caused by primary piston 43 are diverted via the stop disk 55 into a region of the housing 42 located further forward. Therefore, no increased forces occur in the area 67; it only serves to hold the sealing element 47 or the support ring 57.
  • the housing 2.42 of the tandem master cylinder according to the invention is closed on one side by a cover 20.60 and can be machined and assembled from this side, ie on one side become. Furthermore, the tandem master cylinder according to the invention has a small outside diameter in the area of the primary piston 3.43. It is also suitable by using covers 20 with bores 23, 23 'of different diameters for the use of secondary pistons 4, 4' of different diameters, without structural changes to the housing 2 being necessary. A high degree of identical parts in the housing 2 and the cover 20 is thus made possible.

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

Abstract

Le corps (2) du maître-cylindre tandem selon l'invention est fermé sur un côté par un couvercle (20) et peut ainsi être usiné et assemblé à partir de ce côté, c'est-à-dire uniquement d'un côté. En outre, conformément à l'invention, le maître-cylindre tandem présente un faible diamètre extérieur dans la région du piston primaire (3). Grâce à l'emploi de couvercles (20) comportant des orifices (23, 23') de différents diamètres, le maître-cylindre permet l'utilisation de pistons secondaires (4, 4') de différents diamètres, sans qu'il soit nécessaire de recourir à des modifications de la structure du corps (2). Il devient ainsi possible d'utiliser un nombre important d'éléments identiques pour le corps (2) et pour le couvercle (20).
PCT/EP1996/000284 1995-01-24 1996-01-24 Maitre-cylindre tandem WO1996022906A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19501932 1995-01-24
DE19501932.6 1995-01-24

Publications (1)

Publication Number Publication Date
WO1996022906A1 true WO1996022906A1 (fr) 1996-08-01

Family

ID=7752097

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/000284 WO1996022906A1 (fr) 1995-01-24 1996-01-24 Maitre-cylindre tandem

Country Status (1)

Country Link
WO (1) WO1996022906A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0387012A1 (fr) * 1989-03-09 1990-09-12 Pbr Automotive Pty Ltd Dispositif de commande à fluide sous pression
US5187934A (en) * 1990-09-28 1993-02-23 Jidosha Kiki Co., Ltd. Tandem type master cylinder
GB2266752A (en) * 1992-05-08 1993-11-10 Lucas Ind Plc Master cylinder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0387012A1 (fr) * 1989-03-09 1990-09-12 Pbr Automotive Pty Ltd Dispositif de commande à fluide sous pression
US5187934A (en) * 1990-09-28 1993-02-23 Jidosha Kiki Co., Ltd. Tandem type master cylinder
GB2266752A (en) * 1992-05-08 1993-11-10 Lucas Ind Plc Master cylinder

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