EP0307308A1 - Einrichtung zum Verhindern von Waffenrohr-Ausbiegungen - Google Patents

Einrichtung zum Verhindern von Waffenrohr-Ausbiegungen Download PDF

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Publication number
EP0307308A1
EP0307308A1 EP88402251A EP88402251A EP0307308A1 EP 0307308 A1 EP0307308 A1 EP 0307308A1 EP 88402251 A EP88402251 A EP 88402251A EP 88402251 A EP88402251 A EP 88402251A EP 0307308 A1 EP0307308 A1 EP 0307308A1
Authority
EP
European Patent Office
Prior art keywords
tube
sleeve
pipe
annular cavity
integral
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
EP88402251A
Other languages
English (en)
French (fr)
Other versions
EP0307308B1 (de
Inventor
Jean-François Robert
Olivier Tissier
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.)
Cessione giat Industries
Original Assignee
Direction General pour lArmement DGA
Etat Francais
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 Direction General pour lArmement DGA, Etat Francais filed Critical Direction General pour lArmement DGA
Priority to AT88402251T priority Critical patent/ATE62065T1/de
Publication of EP0307308A1 publication Critical patent/EP0307308A1/de
Application granted granted Critical
Publication of EP0307308B1 publication Critical patent/EP0307308B1/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
    • F41A13/00—Cooling or heating systems; Blowing-through of gun barrels; Ventilating systems
    • F41A13/12—Systems for cooling the outer surface of the barrel
    • 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
    • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
    • F41A21/44—Insulation jackets; Protective jackets

Definitions

  • the technical sector of the present invention is that of anti-bending devices intended for tubes of large caliber gun barrels and more particularly cannons fitted to armored vehicles.
  • the generator in the wind will be cooler than its opposite. There will then be an arc and a lateral deviation of the tube. It is therefore easy to see under these conditions that during firing there are significant dispersions, all the more so since the arches will be constant neither in absolute value nor in direction; these deviations can also take prohibitive values in the case of harsh climatic conditions combined with significant heating of the barrel as it can occur after a sustained rate of fire.
  • US Pat. No. 4,424,734 proposes a composite sheath, at least one element of which is a thermal insulator covering the barrel tube.
  • This type of protection has the serious disadvantage of storing heat in the tube, in particular at the level of the combustion chamber. This results in a risk of self-ignition (a phenomenon known as a "cook-off") of an ammunition that remains at the post, a risk incompatible with the safety of the weapon's servants.
  • the main drawback of this arrangement is that during the firing, the temperature rise of the tube (the peripheral temperature of the tube reaches nearly 100 ° for around 10 shots fired in 30 minutes), will cause this layer of air to heat up. thus causing convection movements of the air molecules. These movements will cause an accumulation of calories in the vicinity of the upper generator of the tube, thus creating a temperature gradient between the latter and the lower generator, such an asymmetry causing arcing.
  • the present invention aims to overcome these drawbacks by proposing a simple, light and inexpensive device, allowing on the one hand to isolate all or part of the barrel of the weapon from the ambient air by means of an air layer insulating, and secondly to avoid thermal gradients between the upper and lower generators of the tube.
  • the anti-arching device for a barrel of a large caliber weapon consists of at least one sleeve, made integral with the barrel in translation and in rotation by a connecting means, delimiting, around the barrel and on a part of its length, at least one annular cavity, closed at its ends, it is characterized in that it comprises a ventilation system intended to evacuate the calories which can accumulate in the annular cavity in the vicinity of the upper generatrix of the tube , and in that the ventilation system comprises on the one hand at least one vent, arranged on the sleeve in the vicinity of the lower generatrix of the tube and making the annular cavity communicate with the ambient air, and on the other hand a compressor connected to the annular cavity by a pipe integral with the sleeve, disposed in the vicinity of the upper generatrix of the tube and extending substantially over the entire length of the sleeve, the pipe comprising at least one injection hole.
  • the pipe can be placed inside or outside the annular cavity.
  • the injection hole may be constituted by a slot disposed opposite the upper generatrix of the tube and extending substantially over the entire length of the sleeve.
  • a deflector secured to the sleeve is disposed inside the annular cavity between the injection hole and the upper generatrix of the tube.
  • the compressor will be secured to the fixed part of the weapon and it will be connected to the pipeline by a flexible connection capable of accepting the recoil movement of the tube.
  • the pipe enters during the retraction of the tube into a supply channel which is integral with the fixed part of the weapon and which has a shape complementary to that of the pipe, the sealing between pipe and supply channel will be provided by one or more seals.
  • the device represented in FIG. 1 comprises a sleeve 1, cylindrical and coaxial with a tube 2 of a large caliber cannon, an annular cavity 3 is thus arranged between the tube and the sleeve, cavity which is closed at its two ends by partitions integral with the sleeve (not shown here).
  • the pipe 6 is disposed in the annular cavity 3 and in the vicinity of the upper generator of the tube 2, it carries along certain of its own generators (for example that facing the tube), injection holes 5 (here groups of three 3 mm diameter holes, regularly distributed along a generatrix of the pipeline with a density of 5 groups of holes per meter).
  • the sleeve also carries vents 4 (here 10 vents with a diameter of 2 mm), arranged in the vicinity of the lower generatrix of the tube which make the annular cavity communicate with the ambient air.
  • the compressor 7, the pipe 6 and the vents 4 constitute a ventilation system according to the invention.
  • the compressor will send a pressurized fluid, for example air, into the pipeline. This fluid will diffuse through the injection holes 5 in the annular cavity 3.
  • the fluid outlet temperature is homogeneous along the pipe and is lower than the temperature of the air present in the annular cavity in the vicinity of the upper generator of the tube, (a device making it possible to stabilize the temperature of the fluid can also be provided between the compressor and the pipe).
  • this ventilation system acts on the one hand thermally, by cooling the air contained in the annular cavity at the very place where the temperature was likely to be the highest, on the other hand mechanically , the current of fluid thus created expels the air hot to the lower zone of the annular cavity, the hot air then escapes through the vents 4, because the sleeves are otherwise sealed.
  • the device according to the invention by creating a radial air flow (and no longer axial as in the devices known on medium caliber weapons), on the one hand removes the calories from the zone of the annular cavity in which it would naturally concentrate due to convection phenomena, and on the other hand cause a flow in a radial direction which has the effect of homogenizing the air temperature at all the cross sections of the annular cavity, and therefore of limit the arcing. It will also be possible to make this flow turbulent by varying the value of the section of the vents 4, which will promote the homogenization of the temperature of the annular cavity 3.
  • Figure 2 is a simplified representation of an anti-bending device covering substantially the entire length of the tube 2 of the weapon, and for this purpose the sleeve consists of four sections 8 whose decreasing diameters take account of the taper of the tube . Each section is separated from its neighbors by a partition 9 which may or may not be sealed, the sleeve 1 thus delimits around the tube four annular cavities 3. The pipe 6 passes through these partitions and thus extends over substantially the entire length of the sleeve 1.
  • the sleeve (s) will be made integral with the tube in rotation and in translation in a known manner by a connecting means not shown here. It will in particular be possible to produce sleeves constituted by two symmetrical articulated shells and closing around the tube by a quick coupler, reference will be made to patents EP183432 and DE1918422 which describe such connecting means applied to anti-bending devices.
  • the invention by proposing a ventilation system which makes it possible to evacuate the calories that can accumulate in the vicinity of the upper generator of the tube, allows the use of any material of thermal conductivity for the sleeve.
  • the sleeves not drilled according to the state of the art had to have a high thermal conductivity, both radial and circumferential, in order to be able, on the one hand to homogenize the temperature of the air contained in the annular cavity , and on the other hand evacuate, by exchange with the ambient air, the calories transferred by the tube to the annular cavity and which were likely to cause excessive heating of the latter.
  • FIG. 3 shows in cross section a second particular embodiment of such a system in which the pipe 6 is no longer disposed inside the cavity 3 but is fixed to the external surface of the sleeve.
  • the pipeline thus comprises a cover 11 of substantially cylindrical shape and delimited by two cheeks 10.
  • the injection hole 5 is here constituted by a slot which extends substantially over the entire length of the sleeve. Such an arrangement has the advantage of ensuring the uniformity of the temperature in all the straight sections of the annular cavity along the barrel of the weapon.
  • the sleeve carries, as above, vents 4, arranged in the vicinity of the lower generatrix of the tube and which make the annular cavity communicate with the ambient air.
  • the latter In order to ensure a radial flow of the air supplied by the pipe, the latter will be dimensioned so that its section (S) is greater than or equal to the total area (s) of the injection slot for the sleeve in question .
  • the total section ( ⁇ ) (relative to a sleeve) of all of the vents 4 will be chosen to be less than twice the total area (s) of the injection slot 5 (for the sleeve).
  • a sheet metal deflector 12 is made integral with the sleeve at the injection slot by means of inserts 15 and therefore also extends over the entire length of the sleeve (see FIG. 5).
  • This deflector is disposed between the injection slot 5 and the upper generatrix of the tube, and it is dimensioned so that the air stream supplied by the pipe 6 is deflected laterally towards the inner cylindrical surface of the sleeve 1 This protects the upper generatrix of the tube from excessive cooling, and a turbulent flow is obtained which also promotes the obtaining of a uniform temperature throughout the annular space 3.
  • Figure 4 is a simplified representation of an anti-bending device consisting of four sleeves 1 which cover substantially the entire length of the tube.
  • FIG. 5 shows precisely a sleeve as well as its connection with the two other neighboring sleeves.
  • the sleeves have decreasing diameters taking into account the taper of the barrel of the weapon.
  • each of the sleeves overlap slightly (see Figure 5) and are in mutual contact.
  • An air leak is tolerable when passing between each pipe if the section of this leak remains much less than the cross section of the air passing from one pipe to another, (of the order of%).
  • the compressor 7 thus supplies all of the sleeves 1.
  • the sleeves will be made integral with the tube both in rotation and in translation by means of a fixing device of the type of those described in patents EP183432 and DE1918422 .
  • the compressor 7 will preferably be secured to the fixed part of the weapon in order to avoid recoil shocks. It will then be connected to the pipeline by a flexible connection capable of accepting the recoil movement of the tube.
  • FIG. 4 Another solution shown diagrammatically in FIG. 4 consists in causing the pipe 6 to penetrate during recoil into a supply channel 13 having a complementary shape and which is integral with the fixed part of the weapon, for example at the level of the mask not shown. .
  • the seal between the pipe and the feed channel will be ensured by one or more seals 14.
  • the section of the pipe 6 is therefore decreasing along the tube to its end, thus ensuring uniformity along the tube of the ventilation of the various annular cavities 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Insulation (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Lock And Its Accessories (AREA)
  • Window Of Vehicle (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
EP88402251A 1987-09-09 1988-09-08 Einrichtung zum Verhindern von Waffenrohr-Ausbiegungen Expired - Lifetime EP0307308B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88402251T ATE62065T1 (de) 1987-09-09 1988-09-08 Einrichtung zum verhindern von waffenrohrausbiegungen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8712485A FR2620210A1 (fr) 1987-09-09 1987-09-09 Dispositif antiarcure pour tube d'arme
FR8712485 1987-09-09

Publications (2)

Publication Number Publication Date
EP0307308A1 true EP0307308A1 (de) 1989-03-15
EP0307308B1 EP0307308B1 (de) 1991-03-27

Family

ID=9354735

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88402251A Expired - Lifetime EP0307308B1 (de) 1987-09-09 1988-09-08 Einrichtung zum Verhindern von Waffenrohr-Ausbiegungen

Country Status (5)

Country Link
EP (1) EP0307308B1 (de)
AT (1) ATE62065T1 (de)
DE (1) DE3862182D1 (de)
ES (1) ES2022668B3 (de)
FR (1) FR2620210A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0687884A1 (de) * 1994-06-16 1995-12-20 Giat Industries Hülle gegen Durchbiegung
US7661348B2 (en) 2005-04-27 2010-02-16 Heckler & Koch Gmbh Exchangeable barrel modules for firearms
EP2053338A3 (de) * 2007-10-26 2011-09-14 Krauss-Maffei Wegmann GmbH & Co. KG Klein- oder mittelkalibrige Maschinenkanone

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3833924A4 (de) * 2018-08-21 2022-06-15 Kiruna Engineering and Services FZ-LL Kanonenrohrkühlsystem mit vernebeltem wasser

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1351017A (en) * 1918-11-07 1920-08-31 Charles C Blackmore Automatic gun
GB702878A (en) * 1951-06-19 1954-01-27 George Angus Clunies Ross Improvements in or relating to cooling apparatus for guns
US2935912A (en) * 1950-10-11 1960-05-10 Olin Mathieson Erosion-and-corrosion-resistant gun barrel adapted to hold a coolant
US4663875A (en) * 1985-12-30 1987-05-12 Colt Industries Inc. Rifle handguard assembly having outer shell with outer and inner liners

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE319915C (de) * 1916-09-19 1920-04-10 Emil Schmidtmann Luftkuehlung mittels Propellers fuer Maschinengewehre
US1430661A (en) * 1918-11-23 1922-10-03 Isaac N Lewis Firearm
GB197527A (en) * 1922-05-03 1923-05-17 Laurens Morgan Hamilton Improved means for cooling machine guns
US1543262A (en) * 1924-01-18 1925-06-23 Schneider & Cie Quick-firing gun
US2273839A (en) * 1939-06-16 1942-02-24 Port Theophile De Barrel cooling device
US2806409A (en) * 1951-05-29 1957-09-17 William P Purcella Cooling mechanism for machine guns and the like
FR1445546A (fr) * 1965-04-30 1966-07-15 Le Magnesium Ind Procédé pour empêcher l'arcure et dispositif mettant ce procédé en oeuvr

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1351017A (en) * 1918-11-07 1920-08-31 Charles C Blackmore Automatic gun
US2935912A (en) * 1950-10-11 1960-05-10 Olin Mathieson Erosion-and-corrosion-resistant gun barrel adapted to hold a coolant
GB702878A (en) * 1951-06-19 1954-01-27 George Angus Clunies Ross Improvements in or relating to cooling apparatus for guns
US4663875A (en) * 1985-12-30 1987-05-12 Colt Industries Inc. Rifle handguard assembly having outer shell with outer and inner liners

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0687884A1 (de) * 1994-06-16 1995-12-20 Giat Industries Hülle gegen Durchbiegung
FR2721390A1 (fr) * 1994-06-16 1995-12-22 Giat Ind Sa Manchon anti-arcure.
US5650586A (en) * 1994-06-16 1997-07-22 Giat Industries Anti buckle fitting
US7661348B2 (en) 2005-04-27 2010-02-16 Heckler & Koch Gmbh Exchangeable barrel modules for firearms
EP2053338A3 (de) * 2007-10-26 2011-09-14 Krauss-Maffei Wegmann GmbH & Co. KG Klein- oder mittelkalibrige Maschinenkanone
EP2610574A1 (de) * 2007-10-26 2013-07-03 Krauss-Maffei Wegmann GmbH & Co. KG Klein- oder mittelkalibrige Maschinenkanone
EP2610574B1 (de) 2007-10-26 2016-11-30 Krauss-Maffei Wegmann GmbH & Co. KG Klein- oder mittelkalibrige Maschinenkanone

Also Published As

Publication number Publication date
ATE62065T1 (de) 1991-04-15
DE3862182D1 (de) 1991-05-02
ES2022668B3 (es) 1991-12-01
EP0307308B1 (de) 1991-03-27
FR2620210A1 (fr) 1989-03-10

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