EP2400255A2 - Recoil absorber - Google Patents

Recoil absorber Download PDF

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Publication number
EP2400255A2
EP2400255A2 EP11005117A EP11005117A EP2400255A2 EP 2400255 A2 EP2400255 A2 EP 2400255A2 EP 11005117 A EP11005117 A EP 11005117A EP 11005117 A EP11005117 A EP 11005117A EP 2400255 A2 EP2400255 A2 EP 2400255A2
Authority
EP
European Patent Office
Prior art keywords
oil
gas
recoil
mass
energy absorber
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.)
Withdrawn
Application number
EP11005117A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2400255A3 (en
Inventor
Itshak Korman
Arnon Gilan
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.)
Soltam Systems Ltd
Original Assignee
Soltam Systems Ltd
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 Soltam Systems Ltd filed Critical Soltam Systems Ltd
Publication of EP2400255A2 publication Critical patent/EP2400255A2/en
Publication of EP2400255A3 publication Critical patent/EP2400255A3/en
Withdrawn legal-status Critical Current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
    • 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
    • F41A25/16—Hybrid systems
    • F41A25/20—Hydropneumatic systems

Definitions

  • the present invention relates to devices which safely absorb recoil energy. More particularly, the invention provides a recoil absorber suitable for heavy mortars and other firearms, being particularly useful where the weapon is to be mounted on a lightweight vehicle.
  • the buffer consists of a hydraulic system, in which oil is forced by the recoil movement to flow through a narrow restriction or orifice, often of variable cross section.
  • the viscous resistance to flow produces the braking force and dissipates the kinetic energy of the recoil mass, thus bringing the recoil mass to rest within the prescribed stroke.
  • the average braking force multiplied by the recoil stroke distance equals the kinetic energy dissipated during recoil.
  • the braking force offered by the buffer must be as uniform as possible along the recoil stroke. This is the reason for the variable cross section of the restriction or orifice within the buffer.
  • the recuperator consists of some type of spring - either metallic (usually helical) or a hydro-pneumatic one. During the recoil movement, this spring stores a relatively small part of the recoil-mass kinetic energy, which is then used to return the recoil-mass to in-battery position.
  • the retarding force offered by the recuperator does not substantially improve the uniformity of the braking force opposing recoil.
  • the present invention achieves the above objects by providing an improved energy absorber being particularly useful for the control of recoil forces generated during firing of military weapons such as heavy mortar or cannon and the like which is to be vehicle mounted, said absorber comprising
  • an energy absorber as claimed in claim 1, further comprising at least one compressible bumper disposed between said stationary mass or a stationary component attached thereto and between said moving mass or a component attached thereto, said bumper being positioned to halt recoil movement in excess of a predetermined allowed stroke.
  • an energy absorber wherein said gas is nitrogen. In a further preferred embodiment of the present invention there is provided an energy absorber wherein said gas is air.
  • an energy absorber wherein a plurality of equally-spaced oil-gas cylinders are attached to said movable mass and are disposed around said barrel assembly of said firearm and parallel thereto.
  • an energy absorber wherein said gas portions of said oil-gas cylinders are interconnected by tubing.
  • each section of said tubing includes a shut off valve to allow emergency operation of said firearm where one of said oil-gas cylinders is damaged or is not functional.
  • an energy absorber further provided with a gas recharging port in fluid communication with said gas portion of said oil-gas cylinder, and an oil recharging port in fluid communication with said oil portion of said oil-gas cylinder.
  • the novel device of the present invention uses the compressed gas to provide a recoil resistance force which remains almost constant over the length of the recoil movement. Consequently the degree of variation of the braking force along the recoil stroke is very moderate and the PRF is considerably reduced, until it becomes almost equal to the average recoil force.
  • This advantage is in contrast with the conventional recoil mechanisms which use hydraulic piston with a variable clearance in order to absorb the recoil energy, suffering from the inherent drawback that the braking force cannot be even close to constant along the recoil stroke, because it is velocity dependent, and cannot instantly build up from zero.
  • the PRF having a substantially lower value in the present invention suffices for absorbing the recoil energy.
  • the initial charging pressure of the gas compartment may be adjusted to stop the recoil mass within the required recoil stroke length. If however the recoil velocity is not absolutely zero the recoil mass will be stopped by the bumper seen in FIG. 2 .
  • the oil restrictor orifice may be adjusted to bring the recoil mass to a complete stop in the retraction phase within the prescribed length which is of course equal to the recoil stroke length. Yet if necessary, front bumpers can be added to stop the retraction movement within its limits.
  • FIG. 1 An improved energy absorber 10 being particularly useful for the control of recoil forces generated during the firing of a military weapon such as a heavy mortar or cannon 12.
  • a stationary mass 14 such as the steel framework is seen in FIG 3 , is attachable to a platform or floor of the vehicle not shown.
  • a movable mass 16 is slidably attached to the stationary mass. The moveable mass slides within the Cradle. The Cradle itself is stationary.
  • a first hydraulic cylinder 18 has a cylindrical component 20 and a piston component 22, one of said components being attached to the stationery mass 14 and the remaining component being attached in line to the movable mass 16.
  • An oil restrictor circuit 24 is in fluid communication with the first hydraulic cylinder 18.
  • the circuit 24 comprises a restrictor orifice 26, preferably adjustable, in parallel to a one-way valve 28.
  • the valve 28 is opened by oil forced out of the cylindrical component 20 by the recoil movement.
  • An oil-gas hydraulic cylinder 30 has a diameter substantially larger than the diameter of the first hydraulic cylinder 18.
  • the cylinder 30 is positioned in parallel to the barrel of the weapon 12.
  • the oil-gas cylinder 30 is rigidly attached to the movable mass 16, and is divided by a floating piston 36 into a shorter portion 32 and a longer portion 34.
  • the shorter portion 32 contains oil or other hydraulic liquid.
  • the shorter portion 32 receives additional oil from the oil restrictor circuit, thus moving the floating piston 36 a short distance B and causing a small increase in gas pressure.
  • the high pressure gas cylinder 30 presses out the additional oil which now flows back to the first hydraulic cylinder 18 via the restrictor orifice 26, whereby the weapon is ready to fire the next round.
  • the axial floating piston 36 motion during recoil of the weapon is less than 20% of the length of the gas-containing portion 34 of the oil-gas cylinder 30.
  • the preferred gas 34 is nitrogen. However air can be used in circumstances when compressed nitrogen is unavailable.
  • an energy absorber 40 further comprising a plurality of compressible bumpers 42 disposed on the stationary mass 44 itself or a stationary component 46 attached thereto.
  • the bumpers 42 are sized to contact the moving mass 48, or a component 50 attached thereto.
  • the bumpers 42 are arranged to halt recoil movement in excess of a predetermined allowed stroke.
  • FIG. 3 shows a practical recoil energy absorber 60 wherein a plurality of symmetrically spaced oil-gas cylinders 30 are attached symmetrically around the barrel of the weapon 12.
  • the cylinders 30 are rigidly connected to the movable mass 16 and are disposed around the barrel assembly 12 of the mortar.
  • the fixed framework 14 carries rails 62 which slidably support the sleeves of the movable mass 16.
  • Seen in FIG. 4 is a portion of an energy absorber 70 wherein the gas portions 34 of the oil-gas cylinders 30 are interconnected by tubing 72. Equalizing the gas pressure in the cylinders 30 is important in achieving symmetry of braking and avoiding the phenomenon known in the art as "barrel jump".
  • Each section of the tubing 72 includes a shut off valve 74 to allow emergency operation of the firearm where one of the oil-gas cylinders 30 is damaged or is not functional. In the present embodiment provision is made for the possible loss of fluids in the cylinders 30.
  • a gas recharging port 76 is in fluid communication with the gas portion 34 of the oil-gas cylinder.
  • an oil recharging port 78 in fluid communication with the oil portion 32 of the oil-gas cylinder 30.
  • an energy absorber 80 wherein the oil-gas cylinder 30 is disposed in line and in contact with the barrel assembly 12 of the firearm.
  • the present configuration requires more room in an axial direction than the previous embodiments, but has an important advantage: there are no side forces which need to be carried. Thus where enough room is available a lighter structure can serve the purpose of supporting the various components of the movable mass 82.
EP11005117.4A 2010-06-24 2011-06-23 Recoil absorber Withdrawn EP2400255A3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IL206630A IL206630A (en) 2010-06-24 2010-06-24 Energy absorber for firearms

Publications (2)

Publication Number Publication Date
EP2400255A2 true EP2400255A2 (en) 2011-12-28
EP2400255A3 EP2400255A3 (en) 2014-07-23

Family

ID=43569943

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11005117.4A Withdrawn EP2400255A3 (en) 2010-06-24 2011-06-23 Recoil absorber

Country Status (2)

Country Link
EP (1) EP2400255A3 (en�)
IL (1) IL206630A (en�)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9506728B2 (en) 2014-08-04 2016-11-29 Harris Corporation Recoil absorbing mechanism
US10240885B2 (en) 2016-12-07 2019-03-26 Harris Corporation Shock absorbing disruptor mounting system
US10955212B2 (en) 2018-04-16 2021-03-23 Eagle Technology, Llc Lightweight recoil management

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2790357A (en) 1952-09-16 1957-04-30 Garrett Emil Recoil mechanism for a mortar
US4587882A (en) 1983-07-01 1986-05-13 Rheinmetall Gmbh Pneumatic recuperator mechanism for a gun barrel
US4648306A (en) 1983-01-22 1987-03-10 Rheinmetall Gmbh Counter recoil mechanism, preferably for an artillery weapon
US4724740A (en) 1986-05-26 1988-02-16 Esperanza Y Cia, S.A. Recoiling mortar mounted on a revolving platform
US4867038A (en) 1987-08-27 1989-09-19 Rheinmetall Gmbh Recoil brake for a gun
US4875402A (en) 1987-08-27 1989-10-24 Rheinmetall Gmbh Recoil brake for a gun having a heat equalization and indication device
US4924751A (en) 1988-07-16 1990-05-15 Rheinmetall Gmbh Gun barrel recoil brake with throttled counterrecoil
US5168121A (en) 1991-10-07 1992-12-01 General Electric Company Autoloading apparatus for large caliber rapid fire guns
US5650687A (en) 1994-03-01 1997-07-22 Van Den Bogaert; Bernard Ground electrodes for ignition plugs
US6536324B1 (en) 1999-02-16 2003-03-25 Tda Armements S.A.S. Anti-recoil device with brake, brake compensator and recuperator
US6748844B2 (en) 1999-12-29 2004-06-15 Ordnance Development And Engineering Company Of Singapore (1996) Pte Ltd Artillery firing system
US7681351B2 (en) 2006-11-15 2010-03-23 Enidine, Inc. Hydraulic recoil buffer assembly

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2946262A (en) * 1952-09-12 1960-07-26 Ibm Combined gun equilibrator and elevation cylinder
US3566740A (en) * 1969-05-28 1971-03-02 Mimmy H Williams Velocity sensor firing mechanism for artillery weapons
DE2335649C2 (de) * 1973-07-13 1983-12-08 Rheinmetall GmbH, 4000 Düsseldorf Vorrichtung zum Entnehmen eines Teils der Rückstoßenergie für eine Waffenfunktion eines Geschützes
US4088059A (en) * 1977-02-04 1978-05-09 Sanders Associates, Inc. Method and apparatus for controlling and utilizing recoil
US4827829A (en) * 1983-12-08 1989-05-09 Ares, Inc. Recoil and counterrecoil buffer for automatic cannon
US6571676B1 (en) * 2000-12-04 2003-06-03 Lawrence R. Folsom Compact artillery
US6988600B1 (en) * 2001-04-13 2006-01-24 Ace Controls, Inc. High frequency dampening apparatus
DE102006014155A1 (de) * 2006-03-24 2007-09-27 Rheinmetall Waffe Munition Gmbh Hydropneumatisches Brems- und Vorholsystem für Rohrrücklaufgeschütze

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2790357A (en) 1952-09-16 1957-04-30 Garrett Emil Recoil mechanism for a mortar
US4648306A (en) 1983-01-22 1987-03-10 Rheinmetall Gmbh Counter recoil mechanism, preferably for an artillery weapon
US4587882A (en) 1983-07-01 1986-05-13 Rheinmetall Gmbh Pneumatic recuperator mechanism for a gun barrel
US4724740A (en) 1986-05-26 1988-02-16 Esperanza Y Cia, S.A. Recoiling mortar mounted on a revolving platform
US4867038A (en) 1987-08-27 1989-09-19 Rheinmetall Gmbh Recoil brake for a gun
US4875402A (en) 1987-08-27 1989-10-24 Rheinmetall Gmbh Recoil brake for a gun having a heat equalization and indication device
US4924751A (en) 1988-07-16 1990-05-15 Rheinmetall Gmbh Gun barrel recoil brake with throttled counterrecoil
US5168121A (en) 1991-10-07 1992-12-01 General Electric Company Autoloading apparatus for large caliber rapid fire guns
US5650687A (en) 1994-03-01 1997-07-22 Van Den Bogaert; Bernard Ground electrodes for ignition plugs
US6536324B1 (en) 1999-02-16 2003-03-25 Tda Armements S.A.S. Anti-recoil device with brake, brake compensator and recuperator
US6748844B2 (en) 1999-12-29 2004-06-15 Ordnance Development And Engineering Company Of Singapore (1996) Pte Ltd Artillery firing system
US7681351B2 (en) 2006-11-15 2010-03-23 Enidine, Inc. Hydraulic recoil buffer assembly

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9506728B2 (en) 2014-08-04 2016-11-29 Harris Corporation Recoil absorbing mechanism
US10240885B2 (en) 2016-12-07 2019-03-26 Harris Corporation Shock absorbing disruptor mounting system
US10955212B2 (en) 2018-04-16 2021-03-23 Eagle Technology, Llc Lightweight recoil management

Also Published As

Publication number Publication date
IL206630A0 (en) 2010-12-30
EP2400255A3 (en) 2014-07-23
IL206630A (en) 2016-11-30

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