EP1591743B1 - Ventil für Rückstossbremse - Google Patents

Ventil für Rückstossbremse 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
Authority
EP
European Patent Office
Prior art keywords
valve
pin
brake
head
fluid
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.)
Active
Application number
EP05290876A
Other languages
English (en)
French (fr)
Other versions
EP1591743A1 (de
Inventor
Patrick Balbo
Patrice Mendoza
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.)
Nexter Systems SA
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Nexter Systems SA
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Filing date
Publication date
Application filed by Nexter Systems SA filed Critical Nexter Systems SA
Publication of EP1591743A1 publication Critical patent/EP1591743A1/de
Application granted granted Critical
Publication of EP1591743B1 publication Critical patent/EP1591743B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

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

Claims (7)

  1. Ventil (27) zwischen einer Schussbremse (1) und einem Auffüller (18) für eine Waffe, wobei das Ventil ein Metallstück (27a) umfasst, das gegen die Wirkung einer Rückstellfeder (28) beweglich ist, wobei das Metallstück durch einen Kopf (27b) verlängert wird, der eine Dichtfläche (29) umfasst, die dafür vorgesehen ist, mit einem Sitz (30) zusammenzuwirken, um das dichte Schließen des Ventils zu gewährleisten, wobei die Schließbewegung durch den Anstieg des Drucks eines Fluids im Inneren der Bremse und auf der Seite des Metallstücks (27a) bewirkt wird, wobei das Metallstück (27a) in einer Bohrung (19) gleitend angeordnet ist und Mittel umfasst, die ein begrenztes Entweichen des Fluids zwischen dem Metallstück und der Bohrung zulassen.
  2. Ventil nach Anspruch 1, dadurch gekennzeichnet, dass die Mittel zum Entweichen ein radiales Spiel umfassen, das zwischen 0,08 mm und 0,5 mm liegt.
  3. Ventil nach Anspruch 2, dadurch gekennzeichnet, dass die Mittel zum Entweichen ebenfalls wenigstens eine ringförmige Kehle (31) umfassen, die auf dem Metallstück (27a) ausgeführt ist.
  4. Ventil nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Kopf (27b) maschinelle Bearbeitungen (37) umfasst, die den Durchtritt von Fluid vom Auffüller (18) zur Bremse (1) zulassen, wenn das Ventil sich in geöffneter Position befindet.
  5. Ventil nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Kopf (27b) auf der Seite seiner Dichtfläche (29) durch eine Führungsstange (32) verlängert wird, die gleitend in einer Aufnahme (33) montiert ist.
  6. Ventil nach Anspruch 5, dadurch gekennzeichnet, dass es eine Zwischenkammer (35) umfasst, die zwischen die Bohrung (19) und die Aufnahme (33) eingefügt ist, wobei die Kammer den Kopf (27b) des Ventils umgibt.
  7. Ventil nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Bohrung (19), in der das Metallstück (27a) gleitet, in einer Stange (10) der Schussbremse ausgeführt ist.
EP05290876A 2004-04-26 2005-04-20 Ventil für Rückstossbremse Active EP1591743B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0404418 2004-04-26
FR0404418A FR2869405B1 (fr) 2004-04-26 2004-04-26 Soupape pour frein de tir

Publications (2)

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

Family

ID=34942173

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05290876A Active EP1591743B1 (de) 2004-04-26 2005-04-20 Ventil für Rückstossbremse

Country Status (4)

Country Link
EP (1) EP1591743B1 (de)
AT (1) ATE405807T1 (de)
DE (1) DE602005009065D1 (de)
FR (1) FR2869405B1 (de)

Family Cites Families (4)

* 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 (de) * 1967-10-27 1972-03-09 Rheinmetall Gmbh Pneumatischer Rohrvorholer fuer Geschuetze
DE3728533A1 (de) * 1987-08-27 1989-03-09 Rheinmetall Gmbh Rohrbremse fuer eine rohrwaffe
FR2797041B1 (fr) * 1999-07-29 2002-09-20 Giat Ind Sa Jauge de parage pour recuperateur d'arme de gros calibre

Also Published As

Publication number Publication date
EP1591743A1 (de) 2005-11-02
ATE405807T1 (de) 2008-09-15
DE602005009065D1 (de) 2008-10-02
FR2869405A1 (fr) 2005-10-28
FR2869405B1 (fr) 2006-07-28

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