FR2512761A2 - Temporary restraint of brake system pressure retention valve - by using support or adhesive sensitive to immersion in brake fluid - Google Patents

Temporary restraint of brake system pressure retention valve - by using support or adhesive sensitive to immersion in brake fluid Download PDF

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Publication number
FR2512761A2
FR2512761A2 FR8117478A FR8117478A FR2512761A2 FR 2512761 A2 FR2512761 A2 FR 2512761A2 FR 8117478 A FR8117478 A FR 8117478A FR 8117478 A FR8117478 A FR 8117478A FR 2512761 A2 FR2512761 A2 FR 2512761A2
Authority
FR
France
Prior art keywords
brake fluid
rod
valve
fluid
assembly according
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
FR8117478A
Other languages
French (fr)
Other versions
FR2512761B2 (en
Inventor
Jean-Jacques Carre
Roland Levrai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DBA SA
Original Assignee
DBA SA
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 DBA SA filed Critical DBA SA
Priority to FR8117478A priority Critical patent/FR2512761A2/en
Priority to AU84964/82A priority patent/AU556422B2/en
Priority to US06/391,626 priority patent/US4484671A/en
Priority to DE8282401233T priority patent/DE3263116D1/en
Priority to EP19820401233 priority patent/EP0069658B1/en
Publication of FR2512761A2 publication Critical patent/FR2512761A2/en
Application granted granted Critical
Publication of FR2512761B2 publication Critical patent/FR2512761B2/fr
Granted legal-status Critical Current

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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
    • B60T11/18—Connection thereof to initiating means
    • 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
    • B60T11/14—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 the transmitted force being substantially unchanged
    • 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
    • B60T11/28—Valves specially adapted therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

A valve for rotation of an intermediate pressure level in a hydraulic brake system is built initially with the spring loaded non-return valve supported clear of its seat by a spacer which is sensitive to and weakened by the brake fluid to be used. The spacer allows the system to be evacuated prior to the initial priming of the system with fluid, in accordance with modern assembly methods, without the valve acting to isolate part of the system while the pressure is below its normal operating condition. The spacer may be a hollow body or a cage made pref. of a polysulphone or a polymethacrylate material, to be weakened sufficiently by the fluid to release the valve core mechanically, or may be a soluble adhesive used to retain the valve core in an 'open' position until after a period of immersion in brake fluid.

Description

La présente addition concerne un ensemble générateur de pression pour installation de freinage hydraulique du type décrit dans la demande de brevet français nO 81 13385, déposée le 8 juillet 1981. The present addition relates to a pressure generator assembly for a hydraulic braking installation of the type described in French patent application No. 81 13385, filed on July 8, 1981.

Selon cette addition, un ensemble générateur de pression conforme à la première revendication du brevet principal est caractérisé en ce que lesdits moyens provisoires de retenue comprennent une tige dont une extrémité est fixée audit boîtier et dont l'autre extrémité, située au voisinage dudit élément de fermeture, forme une tête élargie sur laquelle prennent appui lesdits moyens élastiques, ladite tige étant, au moins partiellement, réalisée en un matériau dit "réactif", dont les caractéristiques mécaniques sont affaiblies par le contact avec le liquide de freinage. According to this addition, a pressure generator assembly according to the first claim of the main patent is characterized in that said temporary retaining means comprise a rod one end of which is fixed to said housing and the other end of which is located in the vicinity of said element of closure, forms an enlarged head on which said elastic means bear, said rod being, at least partially, made of a material called "reactive", the mechanical characteristics of which are weakened by contact with the brake fluid.

Selon un autre aspect de l'invention, ladite partie de tige réalisée en matériau "réactif" est enfermée dans une cavité, reliée à ladite chambre par un passage de faible section. According to another aspect of the invention, said part of the rod made of “reactive” material is enclosed in a cavity, connected to said chamber by a passage of small section.

L'invention sera maintenant décrite en se référant à la figure unique des dessins qui est une vue en coupe longitudinale d'une soupape propre à etre incorporée -dans un ensemble générateur de pression selon la présente addition. The invention will now be described with reference to the single figure of the drawings which is a view in longitudinal section of a valve suitable for being incorporated in a pressure generator assembly according to the present addition.

Pour des raisons de commodité, les éléments identiques à ceux des modes de réalisation du brevet principal porteront les mêmes numéros de référence, augmentés de la valeur 100. For reasons of convenience, elements identical to those of the embodiments of the main patent will bear the same reference numbers, increased by the value 100.

Ainsi, la soupape 314 comprend un élément de fermeture 332, monté sur un élément de boitier ou insert 364 formant raccord, coopérant avec un siege 330 défini sur le raccord 364 autour d'un orifice de sortie 326. Un ressort 342 prend appui sur une coupelle 344, elle-même fixée au raccord 364 gracie à un fourreau 366, pour repousser I'élément de fermeture 332 en contact avec le siège 330. On trouvera dans le brevet principal une description plus détaillée des autres éléments de la soupape et de l'installation de freinage dans laquelle elle s'insère. Thus, the valve 314 comprises a closing element 332, mounted on a housing element or insert 364 forming a fitting, cooperating with a seat 330 defined on the fitting 364 around an outlet orifice 326. A spring 342 is supported on a cup 344, itself fixed to the fitting 364 thanks to a sheath 366, for pushing the closing element 332 into contact with the seat 330. A more detailed description of the other elements of the valve and of the valve is found in the main patent. braking system in which it is inserted.

Des moyens provisoires de retenue pour contenir le ressort 342 sont réalisés comme suit
Deux pièces métalliques 368 et 370 sont serties aux deux extrémités d'une tige 352 réalisée en matériau "réactif", expression par laquelle on entend que les caractéristiques mécaniques du matériau sont altérées au co tact du liquide de freinage, comme il sera explicité ci-apres.Temporary retaining means for containing the spring 342 are produced as follows
Two metal parts 368 and 370 are crimped at the two ends of a rod 352 made of “reactive” material, an expression by which it is meant that the mechanical characteristics of the material are altered by contact with the brake fluid, as will be explained below. after.

La première pièce métallique 368 est encliquetée dans la coupellc 344 et la seconde 370 comporte une tete 354 contre laquelle vient prendre appui le ressort 342.  The first metal part 368 is snapped into the cup 344 and the second 370 has a head 354 against which the spring 342 comes to bear.

En complément, la première pièce métallique 368 comporte une jupe 372 qui se prolonge autour de la seconde pièce 370, jusqu'au contact de la tête 354. In addition, the first metal part 368 has a skirt 372 which extends around the second part 370, until it contacts the head 354.

De la sorte, la tige 352 se trouve enfermée dans une cavité 374 qui communique avec l'extérieur via des passages de faible section 376 et 378, les premiers (376) étant définis par des cannelures longitudinales à 8'extérieur de la seconde pièce 370 ou à l'intérieur de la jupe 372 ou encore en prévoyant un jeu entre la jupe et la seconde pièce, et les seconds (378) étant définis par des entailles radiales en bout de jupe 372 ou sur la tête 354. In this way, the rod 352 is enclosed in a cavity 374 which communicates with the outside via passages of small section 376 and 378, the first (376) being defined by longitudinal grooves outside of the second part 370 or inside the skirt 372 or by providing clearance between the skirt and the second part, and the second ones (378) being defined by radial notches at the end of the skirt 372 or on the head 354.

Le comportement du dispositif lors du remplissage de l'installation de freinage est le suivant
Durant la phase de mise au vide, la cavité 374 est également mise sous vide via les passages 376 et 378 ; durant la phase suivante, dans laquelle l'installation de freinage est mise en communication avec une réserve de liquide de freinage, la cavité 374 se remplit et le liquide de freinage vient au contact-de la tige 352 dont la résistance devient inférieure à la force du ressort 342. Il s'ensuit une rupture de la tige 352 et le ressort 342 vient appliquer l'élément de fermeture 332 sur son siège 330. Compte tenu de la composition usuelle du liquide de freinage, parmi les matériaux possibles pour la tige 352, on retiendra en particulier celui connu sous le nom de polysulfone ou encore les matériaux à base de polymétacrylate.The behavior of the device when filling the braking system is as follows
During the evacuation phase, the cavity 374 is also evacuated via the passages 376 and 378; during the next phase, in which the braking system is placed in communication with a reserve of brake fluid, the cavity 374 is filled and the brake fluid comes into contact with the rod 352 whose resistance becomes less than the force of the spring 342. It follows a rupture of the rod 352 and the spring 342 comes to apply the closing element 332 on its seat 330. Taking into account the usual composition of the brake fluid, among the possible materials for the rod 352 , in particular that known under the name of polysulfone or else materials based on polymethacrylate will be retained.

La présence de la jupe 372 et des passages de faible section 376, 378 procure les avantages suivants
1) La tige 352 est protégée contre les agents extérieurs au cours des manipulations et du stockage des éléments préassemblés.The presence of the skirt 372 and small section passages 376, 378 provides the following advantages
1) The rod 352 is protected against external agents during handling and storage of the preassembled elements.

2) Lors de la rupture de la tige 352, il peut se produire que des débris se détachent de la zone de rupture ; ces débris sont alors emprisonnés dans la cavité 374 et ne peuvent pénétrer dans le circuit de freinage. 2) During the rupture of the rod 352, it may occur that debris is detached from the rupture zone; this debris is then trapped in the cavity 374 and cannot enter the braking circuit.

3) Des tests d'étanchéité peuvent être pratiqués sur la soupape avant son installation et en utilisant le liquide de freinage lui-même. En effet, lors de ces tests on applique une pression à ltorifice 326, la pièce métallique 368 étant bien entendu libérée par rapport à la coupelle 344, et le liquide de freinage est susceptible de venir en contact avec les pièces 368 et 370, néanmoins la faible section des passages 376 et 378 ne permet pas au liquide de freinage de pénétrer dans la cavité 374. La tige 352 reste par conséquent indemne. 3) Leak tests can be performed on the valve before installation and using the brake fluid itself. In fact, during these tests, pressure is applied to the orifice 326, the metal part 368 being of course released relative to the cup 344, and the brake fluid is likely to come into contact with the parts 368 and 370, however the small section of the passages 376 and 378 does not allow the brake fluid to enter the cavity 374. The rod 352 therefore remains unscathed.

4) Le remplissage de l'installation doit impérativement être effectué par mise au vide préalable. En effet, si l'on utilise des techniques classiques par écoulement gravitationnel ou sous faible pression, la faible section des passages 376, 378 empêche l'évacuation de l'air contenu dans la cavité 374 et le remplissage de celle-ci avec du liquide de freinage, et par voie de conséquence, la rupture de la tige 352 ne se produit pas lors du remplissage. 4) The filling of the installation must imperatively be carried out by vacuuming beforehand. Indeed, if conventional techniques are used by gravitational flow or under low pressure, the small section of the passages 376, 378 prevents the evacuation of the air contained in the cavity 374 and the filling of the latter with liquid. braking, and consequently, the rupture of the rod 352 does not occur during filling.

On notera que cette disposition peut avantageusement s'appliquer au second mode de réalisation du brevet principal (voir Figure 3 et partie de la description s'y rapportant). Note that this arrangement can advantageously apply to the second embodiment of the main patent (see Figure 3 and part of the description relating to it).

Enfin, les deux éléments 368 et 370 ont été, par commodité, décrits comme réalisés en métal. En fait, il va de soi que tout matériau "non réactif", c'est-à-dire dont les caractéristiques mécaniques ne sont pas altérées par le contact avec le liquide de .freinage, pourra convenir pour ces éléments.  Finally, the two elements 368 and 370 have been, for convenience, described as being made of metal. In fact, it goes without saying that any "non-reactive" material, that is to say one whose mechanical characteristics are not altered by contact with the brake fluid, may be suitable for these elements.

Claims (6)

REVENDICATIONS 1) Ensemble générateur de pression selon la revendication 1 du brevet nO 81 13385, dit brevet principal, caractérisé en ce que lesdits moyens provisoires de retenue comprennent une tige (352) dont une extrémité est fixée audit bottier et dont l'autre extrémité, située au voisinage dudit élément de fermeture (332) forme une tête élargie (354) sur laquelle prennent appui lesdits moyens élastiques (342), ladite tige (352) étant, au moins partiellement, réalisée en un matériau dit "réactif" dont les caractéristiques mécaniques sont affaiblies par le contact avec le liquide de freinage. 1) pressure generator assembly according to claim 1 of patent No. 81 13385, said main patent, characterized in that said temporary retaining means comprise a rod (352) one end of which is fixed to said shoemaker and the other end of which is located in the vicinity of said closure element (332) forms an enlarged head (354) on which said elastic means (342) bear, said rod (352) being, at least partially, made of a so-called "reactive" material whose mechanical characteristics are weakened by contact with the brake fluid. 2) Ensemble générateur de pression selon la revendication 1, caractérisé en ce que ledit matériau réactif est du polysulfone. 2) pressure generator assembly according to claim 1, characterized in that said reactive material is polysulfone. 3) Ensemble générateur de pression selon la revendication 1, caractérisé en ce que ledit matériau réactif est du polymétacrylate. 3) pressure generator assembly according to claim 1, characterized in that said reactive material is polymetacrylate. 4) Ensemble générateur de pression selon l'une des revendications précédentes ou la revendication 3 du brevet principal, caractérisé en ce que la partie de tige (152, 352) réalisée en matériau réactif ou en matériau soluble est enfermée dans une-cavité (374) reliée à- ladite chambre -(128, 328) par un passage de faible section (376, 378). 4) pressure generator assembly according to one of the preceding claims or claim 3 of the main patent, characterized in that the rod portion (152, 352) made of reactive material or soluble material is enclosed in a-cavity (374 ) connected to- said chamber - (128, 328) by a passage of small section (376, 378). 5) Ensemble générateur de pression selon la revendication 3 caractérisé en ce que ladite partie de tige (352) est solidaire à ses deux extrémités de deux éléments (368, 370) dont l'un est- fixé audit boitier (322, 364) et dont l'autre compofte ladite tette -(354), l'un desdits éléments comportant une jupe (372) se prolongeant en direction de l'autre élément, ladite cavité (374) étant définie à l'intérieur de ladite jupe (372) et ledit passage (376, 378) de faible section étant défini entre ladite jupe et ledit autre élément. 5) pressure generator assembly according to claim 3 characterized in that said rod portion (352) is integral at its two ends with two elements (368, 370) one of which is fixed to said housing (322, 364) and the other of which comprises said pad - (354), one of said elements comprising a skirt (372) extending in the direction of the other element, said cavity (374) being defined inside said skirt (372) and said passage (376, 378) of small section being defined between said skirt and said other element. 6) Soupape de maintien de-pression résiduelle, selon la revendication 7 du brevet principal, caractérisée en ce que- lesdits moyens provisoires de retenue comprennent une tige (352) dont une extrémité est fixée audit boitier et dont l'autre extrémité, située au voisinage dudit élément de fermeture (332), forme une tête élargie (354) sur laquelle prennent appui lesdits moyens élastiques (342), ladite tige (352) étant, au moins partiellement, réalisée en un matériau dit "réactif" dont les caractéristiques mécaniques sont affaiblies par le contact avec le liquide de freinage.  6) Residual pressure holding valve according to claim 7 of the main patent, characterized in that- said temporary retaining means comprise a rod (352) one end of which is fixed to said housing and the other end of which is located at vicinity of said closure element (332), forms an enlarged head (354) on which said elastic means (342) bear, said rod (352) being, at least partially, made of a so-called "reactive" material whose mechanical characteristics are weakened by contact with the brake fluid.
FR8117478A 1981-07-08 1981-09-16 Temporary restraint of brake system pressure retention valve - by using support or adhesive sensitive to immersion in brake fluid Granted FR2512761A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
FR8117478A FR2512761A2 (en) 1981-09-16 1981-09-16 Temporary restraint of brake system pressure retention valve - by using support or adhesive sensitive to immersion in brake fluid
AU84964/82A AU556422B2 (en) 1981-07-08 1982-06-18 Pressurising brake systems
US06/391,626 US4484671A (en) 1981-07-08 1982-06-24 Pressure generator unit for hydraulic braking system
DE8282401233T DE3263116D1 (en) 1981-07-08 1982-07-01 Valve for maintaining residual pressure in a pressure generating assembly for a hydraulic brake installation
EP19820401233 EP0069658B1 (en) 1981-07-08 1982-07-01 Valve for maintaining residual pressure in a pressure generating assembly for a hydraulic brake installation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8117478A FR2512761A2 (en) 1981-09-16 1981-09-16 Temporary restraint of brake system pressure retention valve - by using support or adhesive sensitive to immersion in brake fluid

Publications (2)

Publication Number Publication Date
FR2512761A2 true FR2512761A2 (en) 1983-03-18
FR2512761B2 FR2512761B2 (en) 1984-09-28

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FR8117478A Granted FR2512761A2 (en) 1981-07-08 1981-09-16 Temporary restraint of brake system pressure retention valve - by using support or adhesive sensitive to immersion in brake fluid

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FR (1) FR2512761A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2528613A1 (en) * 1982-06-09 1983-12-16 Hitachi Ltd SEMICONDUCTOR MEMORY

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2528613A1 (en) * 1982-06-09 1983-12-16 Hitachi Ltd SEMICONDUCTOR MEMORY

Also Published As

Publication number Publication date
FR2512761B2 (en) 1984-09-28

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