EP1591743A1 - Ventil für Rückstossbremse - Google Patents

Ventil für Rückstossbremse Download PDF

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Publication number
EP1591743A1
EP1591743A1 EP05290876A EP05290876A EP1591743A1 EP 1591743 A1 EP1591743 A1 EP 1591743A1 EP 05290876 A EP05290876 A EP 05290876A EP 05290876 A EP05290876 A EP 05290876A EP 1591743 A1 EP1591743 A1 EP 1591743A1
Authority
EP
European Patent Office
Prior art keywords
valve
pin
brake
bore
head
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
EP05290876A
Other languages
English (en)
French (fr)
Other versions
EP1591743B1 (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.)
KNDS France SA
Original Assignee
Giat Industries 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 Giat Industries SA filed Critical Giat Industries SA
Publication of EP1591743A1 publication Critical patent/EP1591743A1/de
Application granted granted Critical
Publication of EP1591743B1 publication Critical patent/EP1591743B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 valves for fluid circuits and in particular valves implemented between a firing brake and a filler of a armed.
  • a firing brake is an organ that is interposed between the recoil mass of a weapon and its cradle. It includes a piston that during the recoil of the weapon moves in a fluid hydraulic. The fluid rolling movement ensures the recoil braking.
  • 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 of fluid volume following variations in temperatures (ambient and functional).
  • the filler is usually 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.
  • a valve between the firing brake and the filler. This valve closes when the pressure in the brake exceeds a certain value. This avoids deteriorate the filler by possible overpressures.
  • Known valves comprise a sealing member which is movable against the action of a spring whose stiffness allows 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 room increases rapidly before becoming maximum. A such rebound may communicate to the filler a overpressure can damage it.
  • valve between a brake firing and filler for a weapon, valve comprising a movable pin against the action of a return spring, pawn extended by a head having a sealing surface intended to cooperate with a seat to ensure the closure tight of the valve, the closing movement being caused by increasing the pressure of a fluid to the inside of the brake and the side of the pawn, valve characterized in that the pin is slidable in a bore and comprises means allowing a limited leakage of the fluid between the pawn and bore.
  • the means of leakage comprise a radial clearance of between 0.08 mm and 0.5 mm.
  • the means of escape may also include at least one annular groove made on the pawn.
  • the head may include machining operations allowing the fluid passage from the filler to the brake when the valve is in the open position.
  • the head can be extended on the side of its sealing range by a guide rod that will sliding climb in a dwelling.
  • the valve may comprise an intermediate chamber interposed between bore and housing, surrounding chamber the head of the valve.
  • the bore in which the pawn slides may be realized 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 breech sleeve 2.
  • the body 4 comprises a head 5 which constitutes a plug closure closing the body 4.
  • the head 5 has a stepped profile 6 formed of two cylindrical portions of different diameters, which profile cooperates with complementary shaped machining carried out on the breech sleeve 2.
  • the stepped profile 6 of the head 5 cooperates moreover also with a half-flange 8 which also has a internal machining appropriate.
  • the half-flange 8 is attached to the bolt sleeve by screws (not shown).
  • the brake is here a fur brake comprising a inner shirt 9.
  • a rod 10 is slidably mounted in the body 4. It carries at its inner end a piston head 11 which slide in the chamber bounded by the body 4.
  • a buffer shock 12 is integral with the body 4 and it cooperates with a internal bore 13 of the rod 10 so as to damp the end of the braking motion.
  • the end of the body 4 which is traversed by the rod 10 is closed by a plug 14 which carries means 15 sealing 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) in the cradle 3.
  • the firing brake 1 is connected to a filler 18 at 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.
  • FIG. 1 shows this valve 27 in its position open 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 has a range conical seal 29 which is intended to cooperate with a conical seat 30 machined on the head 16 of the rod 10.
  • the pawn 27a is slidably mounted in the bore 19 and comprises by elsewhere means allowing a limited leakage of the fluid between its outer cylindrical surface and the bore 19.
  • leakage means comprise on the one hand a game of the order of a few tenths of a millimeter between the pin 27a and the bore 19 and on the other hand gorges rings 31 made on the pawn 27a and which make it possible slightly reduce the pressure of the fluid during its passage between pawn and bore.
  • the brake 1 comprises a chamber intermediate 35 which is delimited by the conical seat 30 of the valve and by a conical milling 36 that ends the bore 19.
  • This intermediate chamber receives the fluid leak passing between the pin 27a and the bore 19. It allows to reduce the fluid pressure coming from the bore 19.
  • the valve 27 is extended on the filler side 18 by a cylindrical rod 32 which slides with a game 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 mm and it is lower than the previous one. It allows the passage of fluid from the filler 18 to the bore 19. This rod 32 guiding the valve relative to the housing 33. It controls the positioning of the sealing surface 29 with respect to its seat 30.
  • Figure 4 shows a cross-section of the valve at the level of the head 27b. This section allows to visualize the three machining operations 37 which allow the passage of fluid from the filler 18 to the brake when the valve is in open position.
  • the spring 28 is dimensioned so that it ensures maintaining 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).
  • the spring is on the other hand depressed and the valve is closed when the side pressure bore 19 is greater than 1 MPa.
  • Such a provision maintains the valve in the open position during all the quasi-static movements and a closing of the valve for movements in which a high pressure reigns in the bore 19.
  • valve 27 When the weapon is rest position the position of the The valve is that shown in Figure 2.
  • the valve 27 is then open and the fluid can circulate as well from filler 18 to the brake 1 that the brake to the filler 18 to come maintain a trimming pressure of the order of a few tenths of MPa.
  • the controlled leak of fluid between the pin 27a and the bore 19 allows to postpone the closing of the valve of a few milliseconds.
  • Such an arrangement avoids the rebound of the head 27b of the valve against its seat. We thus avoids any transition from high fluid pressure to the filler 18, especially at the end of the movement of back in battery when the pressure is the strongest.
  • sealing range 29 and seat 30 have another shape that conical.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Braking Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)
  • Lift Valve (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP05290876A 2004-04-26 2005-04-20 Ventil für Rückstossbremse Expired - Lifetime 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 true EP1591743A1 (de) 2005-11-02
EP1591743B1 EP1591743B1 (de) 2008-08-20

Family

ID=34942173

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05290876A Expired - Lifetime 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)

Citations (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
US4867038A (en) * 1987-08-27 1989-09-19 Rheinmetall Gmbh Recoil brake for a gun
EP1072856A1 (de) * 1999-07-29 2001-01-31 Giat Industries Füllstandanzeiger für die Rücklaufbremse einer grosskalibrigen Waffe

Patent Citations (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
US4867038A (en) * 1987-08-27 1989-09-19 Rheinmetall Gmbh Recoil brake for a gun
EP1072856A1 (de) * 1999-07-29 2001-01-31 Giat Industries Füllstandanzeiger für die Rücklaufbremse einer grosskalibrigen Waffe

Also Published As

Publication number Publication date
FR2869405B1 (fr) 2006-07-28
DE602005009065D1 (de) 2008-10-02
ATE405807T1 (de) 2008-09-15
EP1591743B1 (de) 2008-08-20
FR2869405A1 (fr) 2005-10-28

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