EP1591743B1 - Valve for recoil brake - Google Patents

Valve for recoil brake Download PDF

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Publication number
EP1591743B1
EP1591743B1 EP05290876A EP05290876A EP1591743B1 EP 1591743 B1 EP1591743 B1 EP 1591743B1 EP 05290876 A EP05290876 A EP 05290876A EP 05290876 A EP05290876 A EP 05290876A EP 1591743 B1 EP1591743 B1 EP 1591743B1
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EP
European Patent Office
Prior art keywords
valve
pin
brake
head
fluid
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EP05290876A
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German (de)
French (fr)
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EP1591743A1 (en
Inventor
Patrick Balbo
Patrice Mendoza
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Nexter Systems SA
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Nexter Systems SA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A25/00—Gun mountings permitting recoil or return to battery, e.g. gun cradles; Barrel buffers or brakes
    • F41A25/02—Fluid-operated systems

Definitions

  • the technical field of the invention is that of the valves for fluid circuits as described by the document GB 129383 A which forms a base for claim 1, and in particular valves implemented between a firing brake and a filler of a weapon.
  • a firing brake is an organ that is interposed between the retreating mass of a weapon and its cradle. It includes a piston that during the recoil of the weapon moves in a hydraulic fluid. The rolling movement of the fluid ensures the braking of the recoil.
  • a firing brake is usually connected to a hydraulic filler which is a reserve of fluid under moderate pressure (a few tenths of Mega Pascals (MPa)).
  • the purpose of the filler is to compensate for variations in the volume of the fluid as a result of temperature variations (ambient and functional).
  • the filler is generally connected to the low pressure side of the brake that is to say at the level of the brake chamber whose volume increases during the recoil.
  • the filler When the filler is connected to a zone of high pressure, for example at the level of the shock buffer or at the high pressure side of the brake (that is to say on the side where the volume is reduced when the weapon is retracted), usually has a valve between the firing brake and the filler. This valve closes when the brake pressure exceeds a certain value. This avoids damaging the filler by possible overpressure.
  • Known valves comprise a sealing member which is movable against the action of a spring whose stiffness makes it possible to determine the closing pressure of the valve.
  • a problem with the usual valves is that of the rebound of the valve when the pressure in the chamber increases rapidly before becoming maximum. Such a rebound may impart to the filler an overpressure that may deteriorate.
  • the invention relates to a valve between a firing brake and a filler for a weapon, the valve comprising a pin movable against the action of a return spring, a pin extended by a head having a sealing surface intended for cooperating with a seat to ensure the tight closure of the valve, the closing movement being caused by the increase of the pressure of a fluid inside the brake and the side of the pin, the pin being slid in a bore and comprising means allowing a limited leakage of the fluid between the pin and the bore.
  • the leakage means comprise a radial clearance of between 0.08 mm and 0.5 mm.
  • the leakage means may also include at least one annular groove formed on the pin.
  • the head may include machining allowing the passage of fluid from the filler to the brake when the valve is in the open position.
  • the head may be extended towards its sealing surface by a guide rod which will be slidably mounted in a housing.
  • the valve may include an intermediate chamber interposed between the bore and the housing, the chamber surrounding the valve head.
  • the bore in which the slider slides can be made in a rod of the firing brake.
  • a firing brake 1 comprises a body 4 which is fixed by one of its ends to a breeching sleeve 2.
  • the body 4 comprises a head 5 which constitutes a closure plug closing the body 4.
  • the head 5 has a stepped profile 6, formed of two cylindrical portions of different diameters, which profile cooperates with a complementary shape of machining performed on the breech sleeve 2.
  • the stepped profile 6 of the head 5 also cooperates with a half-flange 8 which also includes appropriate internal machining.
  • the half-flange 8 is fixed to the bolt sleeve by screws (not shown).
  • the brake is here a fur brake comprising an inner liner 9.
  • a rod 10 is slidably mounted in the body 4. It carries at its inner end a piston head 11 which slides in the chamber defined by the body 4.
  • a shock pad 12 is integral with the body 4 and it cooperates with an internal bore 13 of the rod 10 so as to dampen the end of the braking movement.
  • the end of the body 4 which is traversed by the rod 10 is closed by a plug 14 which carries means 15 ensuring the seal between plug 14 and rod 10.
  • the rod 10 carries a head 16 which has a stepped profile formed of three distinct cylindrical diameters. This profile cooperates with two jaws 17a, 17b which are fixed by screws (not shown) to the cradle 3.
  • the firing brake 1 is connected to a filler 18 through a bore 19 disposed inside the rod 10. This bore carries a valve 27 pushed by a spring 28 and which prevents overpressure from reaching the filler 18.
  • the figure 2 shows this valve 27 in its open position which is the one it occupies when the brake is at rest.
  • the valve comprises a cylindrical pin 27a which is extended by a head 27b.
  • the latter comprises a conical seal surface 29 which is intended to cooperate with a conical seat 30 machined on the head 16 of the rod 10.
  • the pin 27a is slidably mounted in the bore 19 and it further comprises means allowing a limited leakage of the fluid between its outer cylindrical surface and the bore 19.
  • These leakage means comprise, on the one hand, a functional clearance of the order of a few tenths of a millimeter between the pin 27a and the bore 19 and, on the other hand, annular grooves 31 made on the pin 27a and which make it possible to decrease slightly the pressure of the fluid during its passage between pin and bore.
  • the brake 1 comprises an intermediate chamber 35 which is delimited by the conical seat 30 of the valve and by a conical milling 36 which terminates the bore 19.
  • This intermediate chamber receives the leakage of hydraulic fluid passing between the pin 27a and the bore 19. It reduces the pressure of the fluid from the bore 19.
  • the valve 27 is extended on the filler 18 side by a cylindrical rod 32 which slides with a play in a housing 33 of the head 16, housing which receives the spring 28.
  • the game is also of the order of a few tenths of a millimeter and it is lower than the previous one. It allows the passage of the fluid from the filler 18 to the bore 19. This rod 32 ensures the guiding of the valve relative to the housing 33. It thus controls the positioning of the sealing surface 29 with respect to its seat 30.
  • the figure 4 shows a cross section of the valve at the head 27b. This section makes it possible to visualize the three machining operations 37 which allow the fluid to pass from the filler 18 to the brake when the valve is in the open position.
  • the spring 28 is dimensioned such that it maintains the valve 27 in the open position when the pressure on the side of the bore 19 is less than or equal to about 1 MPa (Mega Pascal). On the other hand, the spring is depressed and the valve is closed when the bore side pressure 19 is greater than 1 MPa.
  • Such an arrangement ensures a maintenance of the valve in the open position during all the quasi-static movements and a closure of the valve for the movements in which a high pressure prevails in the bore 19.
  • valve 27 When the weapon is rest position the position of the valve is the one shown in the figure 2 .
  • the valve 27 is then open and the fluid can flow as well from the filler 18 to the brake 1 as the brake to the filler 18 to maintain a trimming pressure of the order of a few tenths of MPa.
  • sealing surface 29 and its seat 30 have a shape other than conical.
  • plane sealing surfaces may be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Braking Arrangements (AREA)
  • Lift Valve (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

The valve has a cylindrical slug (27a) extended by a head (27b) that includes a conical seating face (29) which cooperates with a conical seat (30) machined on a head (16) of a rod (10). The slug slides in a bore (19) placed inside the rod. A clearance of order of some tenths of millimeter is present between the slug and the bore, and grooves (31) are made on the slug.

Description

Le domaine technique de l'invention est celui des soupapes pour circuits de fluide comme décrit par le document GB 129383 A qui forme une base pour la revendication 1, et notamment des soupapes mises en oeuvre entre un frein de tir et un remplisseur d'une arme.The technical field of the invention is that of the valves for fluid circuits as described by the document GB 129383 A which forms a base for claim 1, and in particular valves implemented between a firing brake and a filler of a weapon.

Un frein de tir est un organe qui est interposé entre la masse reculante d'une arme et son berceau. Il comprend un piston qui lors du recul de l'arme se déplace dans un fluide hydraulique. Le mouvement de laminage du fluide assure le freinage du recul.A firing brake is an organ that is interposed between the retreating mass of a weapon and its cradle. It includes a piston that during the recoil of the weapon moves in a hydraulic fluid. The rolling movement of the fluid ensures the braking of the recoil.

Un frein de tir est généralement raccordé à un remplisseur hydraulique qui est une réserve de fluide sous une pression modérée (quelques dixièmes de Méga Pascals (MPa)). Le remplisseur a pour but de pallier les variations de volume du fluide consécutives aux variations de températures (ambiante et fonctionnelle).A firing brake is usually connected to a hydraulic filler which is a reserve of fluid under moderate pressure (a few tenths of Mega Pascals (MPa)). The purpose of the filler is to compensate for variations in the volume of the fluid as a result of temperature variations (ambient and functional).

Il est généralement raccordé au côté basse pression du frein c'est à dire au niveau de la chambre du frein dont le volume s'accroît lors du recul. Lorsque le remplisseur est raccordé à une zone de haute pression, par exemple au niveau du tampon de choc ou du côté haute pression du frein (c'est à dire du côté ou le volume se réduit lors du recul de l'arme), on dispose habituellement une soupape entre le frein de tir et le remplisseur. Cette soupape se ferme lorsque la pression dans le frein dépasse une certaine valeur. On évite ainsi de détériorer le remplisseur par les surpressions éventuelles.It is generally connected to the low pressure side of the brake that is to say at the level of the brake chamber whose volume increases during the recoil. When the filler is connected to a zone of high pressure, for example at the level of the shock buffer or at the high pressure side of the brake (that is to say on the side where the volume is reduced when the weapon is retracted), usually has a valve between the firing brake and the filler. This valve closes when the brake pressure exceeds a certain value. This avoids damaging the filler by possible overpressure.

Les soupapes connues comprennent un organe d'étanchéité qui est mobile contre l'action d'un ressort dont la raideur permet de déterminer la pression de fermeture de la soupape.Known valves comprise a sealing member which is movable against the action of a spring whose stiffness makes it possible to determine the closing pressure of the valve.

Un problème rencontré avec les soupapes habituelles est celui du rebond de la soupape lorsque la pression dans la chambre augmente rapidement avant de devenir maximale. Un tel rebond risque de communiquer au remplisseur une surpression pouvant le détériorer.A problem with the usual valves is that of the rebound of the valve when the pressure in the chamber increases rapidly before becoming maximum. Such a rebound may impart to the filler an overpressure that may deteriorate.

C'est le but de l'invention que de proposer une soupape permettant de pallier de tels inconvénients, tout en permettant une libre circulation du fluide au repos.It is the object of the invention to provide a valve to overcome such drawbacks, while allowing free circulation of the fluid at rest.

Ainsi l'invention a pour objet une soupape entre un frein de tir et un remplisseur pour une arme, soupape comprenant un pion mobile contre l'action d'un ressort de rappel, pion prolongé par une tête comportant une portée d'étanchéité destinée à coopérer avec un siège pour assurer la fermeture étanche de la soupape, le mouvement de fermeture étant provoqué par l'accroissement de la pression d'un fluide à l'intérieur du frein et du côté du pion, le pion étant coulissant dans un alésage et comportant des moyens autorisant une fuite limitée du fluide entre le pion et l'alésage.Thus, the invention relates to a valve between a firing brake and a filler for a weapon, the valve comprising a pin movable against the action of a return spring, a pin extended by a head having a sealing surface intended for cooperating with a seat to ensure the tight closure of the valve, the closing movement being caused by the increase of the pressure of a fluid inside the brake and the side of the pin, the pin being slid in a bore and comprising means allowing a limited leakage of the fluid between the pin and the bore.

Selon un mode particulier de réalisation, les moyens de fuite comprennent un jeu radial compris entre 0,08 mm et 0,5 mm.According to a particular embodiment, the leakage means comprise a radial clearance of between 0.08 mm and 0.5 mm.

Les moyens de fuite pourront aussi comporter au moins une gorge annulaire réalisée sur le pion.The leakage means may also include at least one annular groove formed on the pin.

La tête pourra comporter des usinages autorisant le passage de fluide du remplisseur vers le frein lorsque la soupape est en position ouverte.The head may include machining allowing the passage of fluid from the filler to the brake when the valve is in the open position.

Avantageusement, la tête pourra être prolongée du côté de sa portée d'étanchéité par une tige de guidage qui sera montée coulissante dans un logement.Advantageously, the head may be extended towards its sealing surface by a guide rod which will be slidably mounted in a housing.

La soupape pourra comporter une chambre intermédiaire interposée entre l'alésage et le logement, chambre entourant la tête de la soupape.The valve may include an intermediate chamber interposed between the bore and the housing, the chamber surrounding the valve head.

L'alésage dans lequel coulisse le pion pourra être réalisé dans une tige du frein de tir.The bore in which the slider slides can be made in a rod of the firing brake.

L'invention sera mieux comprise à la lecture de la description qui va suivre d'un mode particulier de réalisation, description faite en référence aux dessins annexés et dans lesquels :

  • la figure 1 est une vue en coupe d'un frein de tir incorporant une soupape selon l'invention,
  • la figure 2 est une vue agrandie montrant la soupape en position ouverte,
  • la figure 3 est une vue agrandie montrant la soupape en position fermée,
  • la figure 4 est une vue en coupe transversale de la soupape, coupe réalisée suivant le plan dont la trace AA est visible à la figure 2.
The invention will be better understood on reading the following description of a particular embodiment, a description given with reference to the appended drawings and in which:
  • the figure 1 is a sectional view of a firing brake incorporating a valve according to the invention,
  • the figure 2 is an enlarged view showing the valve in the open position,
  • the figure 3 is an enlarged view showing the valve in the closed position,
  • the figure 4 is a cross-sectional view of the valve, cut along the plane whose AA trace is visible at the figure 2 .

En se reportant à la figure 1, un frein de tir 1 comporte un corps 4 qui est fixé par une de ses extrémités à un manchon de culasse 2.Referring to the figure 1 , a firing brake 1 comprises a body 4 which is fixed by one of its ends to a breeching sleeve 2.

Le corps 4 comporte une tête 5 qui constitue un bouchon de fermeture obturant le corps 4.The body 4 comprises a head 5 which constitutes a closure plug closing the body 4.

La tête 5 présente un profil 6 étagé, formé de deux portions cylindriques de diamètres différents, profil qui coopère avec un usinage de forme complémentaire réalisé sur le manchon de culasse 2.The head 5 has a stepped profile 6, formed of two cylindrical portions of different diameters, which profile cooperates with a complementary shape of machining performed on the breech sleeve 2.

Le profil étagé 6 de la tête 5 coopère par ailleurs également avec une demi-bride 8 qui comporte, elle aussi, un usinage interne approprié. La demi-bride 8 est fixée au manchon de culasse par des vis (non représentées).The stepped profile 6 of the head 5 also cooperates with a half-flange 8 which also includes appropriate internal machining. The half-flange 8 is fixed to the bolt sleeve by screws (not shown).

Le frein est ici un frein à fourrure comportant une chemise interne 9.The brake is here a fur brake comprising an inner liner 9.

Une tige 10 est montée coulissante dans le corps 4. Elle porte à son extrémité interne une tête de piston 11 qui coulisse dans la chambre délimitée par le corps 4. Un tampon de choc 12 est solidaire du corps 4 et il coopère avec un alésage interne 13 de la tige 10 de façon à amortir la fin du mouvement de freinage.A rod 10 is slidably mounted in the body 4. It carries at its inner end a piston head 11 which slides in the chamber defined by the body 4. A shock pad 12 is integral with the body 4 and it cooperates with an internal bore 13 of the rod 10 so as to dampen the end of the braking movement.

L'extrémité du corps 4 qui est traversée par la tige 10 est obturée par un bouchon 14 qui porte des moyens 15 assurant l'étanchéité entre bouchon 14 et tige 10.The end of the body 4 which is traversed by the rod 10 is closed by a plug 14 which carries means 15 ensuring the seal between plug 14 and rod 10.

La tige 10 porte une tête 16 qui présente un profil étagé formé de trois diamètres cylindriques distincts. Ce profil coopère avec deux mâchoires 17a, 17b qui sont fixées par des vis (non représentées) au berceau 3.The rod 10 carries a head 16 which has a stepped profile formed of three distinct cylindrical diameters. This profile cooperates with two jaws 17a, 17b which are fixed by screws (not shown) to the cradle 3.

Le frein de tir 1 est raccordé à un remplisseur 18 au travers d'un alésage 19 disposé à l'intérieur de la tige 10. Cet alésage porte une soupape 27 poussée par un ressort 28 et qui empêche les surpressions de parvenir au remplisseur 18.The firing brake 1 is connected to a filler 18 through a bore 19 disposed inside the rod 10. This bore carries a valve 27 pushed by a spring 28 and which prevents overpressure from reaching the filler 18.

La figure 2 montre cette soupape 27 dans sa position ouverte qui est celle qu'elle occupe lorsque le frein est au repos.The figure 2 shows this valve 27 in its open position which is the one it occupies when the brake is at rest.

La soupape comprend un pion cylindrique 27a qui est prolongé par une tête 27b. Cette dernière comporte une portée d'étanchéité conique 29 qui est destinée à coopérer avec un siège conique 30 usiné sur la tête 16 de la tige 10. Le pion 27a est monté coulissant dans l'alésage 19 et il comporte par ailleurs des moyens autorisant une fuite limitée du fluide entre sa surface cylindrique externe et l'alésage 19.The valve comprises a cylindrical pin 27a which is extended by a head 27b. The latter comprises a conical seal surface 29 which is intended to cooperate with a conical seat 30 machined on the head 16 of the rod 10. The pin 27a is slidably mounted in the bore 19 and it further comprises means allowing a limited leakage of the fluid between its outer cylindrical surface and the bore 19.

Ces moyens de fuite comprennent d'une part un jeu fonctionnel de l'ordre de quelques dixièmes de mm entre le pion 27a et l'alésage 19 et d'autre part des gorges annulaires 31 réalisées sur le pion 27a et qui permettent de diminuer légèrement la pression du fluide lors de son passage entre pion et alésage.These leakage means comprise, on the one hand, a functional clearance of the order of a few tenths of a millimeter between the pin 27a and the bore 19 and, on the other hand, annular grooves 31 made on the pin 27a and which make it possible to decrease slightly the pressure of the fluid during its passage between pin and bore.

Par ailleurs le frein 1 comporte une chambre intermédiaire 35 qui est délimitée par le siège conique 30 de la soupape et par un fraisage conique 36 qui termine l'alésage 19.Furthermore, the brake 1 comprises an intermediate chamber 35 which is delimited by the conical seat 30 of the valve and by a conical milling 36 which terminates the bore 19.

Cette chambre intermédiaire reçoit la fuite de fluide hydraulique passant entre le pion 27a et l'alésage 19. Elle permet de réduire la pression du fluide provenant de l'alésage 19.This intermediate chamber receives the leakage of hydraulic fluid passing between the pin 27a and the bore 19. It reduces the pressure of the fluid from the bore 19.

La soupape 27 est prolongée du côté du remplisseur 18 par une tige cylindrique 32 qui coulisse avec un jeu dans un logement 33 de la tête 16, logement qui reçoit le ressort 28.The valve 27 is extended on the filler 18 side by a cylindrical rod 32 which slides with a play in a housing 33 of the head 16, housing which receives the spring 28.

Le jeu est également de l'ordre de quelques dixièmes de mm et il est inférieur au précédent. Il permet le passage du fluide du remplisseur 18 vers l'alésage 19. Cette tige 32 assure le guidage de la soupape par rapport au logement 33. On maîtrise ainsi le positionnement de la portée d'étanchéité 29 par rapport à son siège 30.The game is also of the order of a few tenths of a millimeter and it is lower than the previous one. It allows the passage of the fluid from the filler 18 to the bore 19. This rod 32 ensures the guiding of the valve relative to the housing 33. It thus controls the positioning of the sealing surface 29 with respect to its seat 30.

La figure 4 montre une coupe transversale de la soupape au niveau de la tête 27b. Cette coupe permet de visualiser les trois usinages 37 qui autorisent le passage de fluide du remplisseur 18 vers le frein lorsque la soupape est en position ouverte.The figure 4 shows a cross section of the valve at the head 27b. This section makes it possible to visualize the three machining operations 37 which allow the fluid to pass from the filler 18 to the brake when the valve is in the open position.

Le ressort 28 est dimensionné de telle sorte qu'il assure le maintien de la soupape 27 en position ouverte lorsque la pression du côté de l'alésage 19 est inférieure ou égale à environ 1 MPa (Méga Pascal). Le ressort se trouve par contre enfoncé et la soupape est fermée lorsque la pression côté alésage 19 est supérieure à 1 MPa. Une telle disposition assure un maintien de la soupape en position ouverte pendant tous les mouvements quasi statiques et une fermeture de la soupape pour les mouvements dans lesquels une haute pression règne dans l'alésage 19.The spring 28 is dimensioned such that it maintains the valve 27 in the open position when the pressure on the side of the bore 19 is less than or equal to about 1 MPa (Mega Pascal). On the other hand, the spring is depressed and the valve is closed when the bore side pressure 19 is greater than 1 MPa. Such an arrangement ensures a maintenance of the valve in the open position during all the quasi-static movements and a closure of the valve for the movements in which a high pressure prevails in the bore 19.

Le fonctionnement de cette soupape est le suivant.The operation of this valve is as follows.

Lorsque l'arme est position de repos la position de la soupape est celle représentée à la figure 2. La soupape 27 est alors ouverte et le fluide peut circuler aussi bien du remplisseur 18 vers le frein 1 que du frein vers le remplisseur 18 pour venir maintenir une pression de parage de l'ordre de quelques dixièmes de MPa.When the weapon is rest position the position of the valve is the one shown in the figure 2 . The valve 27 is then open and the fluid can flow as well from the filler 18 to the brake 1 as the brake to the filler 18 to maintain a trimming pressure of the order of a few tenths of MPa.

Lors du tir il y a un déplacement rapide du piston 11 par rapport au corps de frein 4 puis retour en batterie plus lent. Si on se reporte à la figure 1 qui montre le frein de tir au repos, la tige 10 sort tout d'abord rapidement du corps puis elle reprend sa position initiale. Au début du recul il apparaît une dépression fugitive au niveau de l'alésage 19. Compte tenu de la durée réduite du phénomène et du diamètre du canal 34 qui est inférieur à celui de l'alésage 19, le remplisseur 18 ne fournit pas de fluide au frein d'une façon notable.When firing there is a rapid movement of the piston 11 relative to the brake body 4 and return to slower battery. If we go back to figure 1 which shows the brake of shooting at rest, the rod 10 first leaves the body quickly and then it returns to its original position. At the beginning of recoil, there appears a transient depression at the bore 19. Given the reduced duration of the phenomenon and the diameter of the channel 34 which is smaller than that of the bore 19, the filler 18 does not provide fluid to the brake in a noticeable way.

Lors du mouvement de retour en batterie la pression dans l'alésage 19 augmente et devient suffisante pour fermer la soupape 27. Celle ci adopte la position représentée figure 3 où la portée conique 29 est en appui contre son siège 30.During the return movement in battery the pressure in the bore 19 increases and becomes sufficient to close the valve 27. This adopts the position shown figure 3 where the conical bearing 29 bears against its seat 30.

La fuite contrôlée de fluide entre le pion 27a et l'alésage 19 permet de différer la fermeture de la soupape de quelques millisecondes. Une telle disposition permet d'éviter le rebond de la tête 27b de la soupape contre son siège. On évite ainsi tout passage de la haute pression de fluide vers le remplisseur 18, notamment lors de la fin du mouvement de retour en batterie lorsque la pression est la plus forte.The controlled leakage of fluid between the pin 27a and the bore 19 makes it possible to postpone closing the valve by a few milliseconds. Such an arrangement avoids the rebound of the head 27b of the valve against its seat. This avoids any passage of high fluid pressure to the filler 18, especially when the end of the return movement in battery when the pressure is the strongest.

Par ailleurs cette soupape fonctionne quelle que soit la température du fluide.Moreover this valve works whatever the temperature of the fluid.

A titre de variante il est bien entendu possible de réaliser une soupape dans laquelle la portée d'étanchéité 29 et son siège 30 ont une autre forme que conique. On pourra par exemple mettre en oeuvre des portées d'étanchéité planes.As a variant it is of course possible to make a valve in which the sealing surface 29 and its seat 30 have a shape other than conical. For example, plane sealing surfaces may be used.

Claims (7)

  1. A valve (27) between a firing brake (1) and a replenisher (18) of a weapon, such valve comprising a pin (27a) able to move against the action of a return spring (28), such pin being extended by a head (27b) incorporating a sealing support (29) intended to cooperate with a seat (30) to ensure the closing and sealing of the valve, the closing movement being caused by the build up of pressure of a fluid inside the brake on the pin (27a) side, the pin (27a) sliding in a bore hole and incorporating means to enable the restricted escape of fluid between the pin and the bore hole.
  2. A valve according to Claim 1, wherein the escape means comprise radial play of between 0.08 mm and 0.5 mm.
  3. A valve according to Claim 2, wherein the escape means also comprise at least one ring-shaped groove (31) made in the pin (27a).
  4. A valve according to one of Claims 1 to 3, wherein the head (27b) comprises machining (37) enabling the passage of fluid from the replenisher (18) to the brake (1)when the valve is in its open position.
  5. A valve according to one of Claims 1 to 4, wherein the head (27b) is extended on the side of its sealing support (29) by a guiding rod (32) mounted sliding in a housing (33).
  6. A valve according to Claim 5, wherein it incorporates an intermediate chamber (35) positioned between the bore hole (19) and the housing (33), such chamber surrounding the head (27b) of the valve.
  7. A valve according to one of Claims 1 to 6, wherein the bore hole (19) in which the pin (27a) slides is made in a rod (10) of the firing brake.
EP05290876A 2004-04-26 2005-04-20 Valve for recoil brake Active EP1591743B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0404418A FR2869405B1 (en) 2004-04-26 2004-04-26 VALVE FOR BRAKE BRAKE
FR0404418 2004-04-26

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Publication Number Publication Date
EP1591743A1 EP1591743A1 (en) 2005-11-02
EP1591743B1 true EP1591743B1 (en) 2008-08-20

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EP (1) EP1591743B1 (en)
AT (1) ATE405807T1 (en)
DE (1) DE602005009065D1 (en)
FR (1) FR2869405B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB129383A (en) * 1917-11-13 1919-07-17 Armstrong W G Whitworth & Co Improvements in Hydraulic Buffers for Controlling the Movements of Guns in their Mountings.
DE1578048B1 (en) * 1967-10-27 1972-03-09 Rheinmetall Gmbh Pneumatic barrel vet for guns
DE3728533A1 (en) * 1987-08-27 1989-03-09 Rheinmetall Gmbh PIPE BRAKE FOR A PIPE ARM
FR2797041B1 (en) * 1999-07-29 2002-09-20 Giat Ind Sa TRIMMING GAUGE FOR LARGE-CALIBER WEAPON RECOVERY

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FR2869405B1 (en) 2006-07-28
DE602005009065D1 (en) 2008-10-02
ATE405807T1 (en) 2008-09-15
FR2869405A1 (en) 2005-10-28
EP1591743A1 (en) 2005-11-02

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