EP0269560B1 - Installation d'accélération pour le chargement d'un canon - Google Patents

Installation d'accélération pour le chargement d'un canon Download PDF

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Publication number
EP0269560B1
EP0269560B1 EP19870810521 EP87810521A EP0269560B1 EP 0269560 B1 EP0269560 B1 EP 0269560B1 EP 19870810521 EP19870810521 EP 19870810521 EP 87810521 A EP87810521 A EP 87810521A EP 0269560 B1 EP0269560 B1 EP 0269560B1
Authority
EP
European Patent Office
Prior art keywords
piston
piston rod
cylinder
mechanism according
tube
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.)
Expired - Lifetime
Application number
EP19870810521
Other languages
German (de)
English (en)
Other versions
EP0269560A1 (fr
Inventor
Rolf Wipf
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.)
Schweizerische Industrie Gesellschaft
Original Assignee
Schweizerische Industrie Gesellschaft
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 Schweizerische Industrie Gesellschaft filed Critical Schweizerische Industrie Gesellschaft
Publication of EP0269560A1 publication Critical patent/EP0269560A1/fr
Application granted granted Critical
Publication of EP0269560B1 publication Critical patent/EP0269560B1/fr
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
    • F41A9/00—Feeding or loading of ammunition; Magazines; Guiding means for the extracting of cartridges
    • F41A9/38—Loading arrangements, i.e. for bringing the ammunition into the firing position
    • F41A9/39—Ramming arrangements
    • F41A9/42—Rammers separate from breech-block
    • F41A9/44—Fluid-operated piston rammers
    • 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
    • F41A9/00—Feeding or loading of ammunition; Magazines; Guiding means for the extracting of cartridges
    • F41A9/50—External power or control systems

Definitions

  • An acceleration device according to the preamble of claim 1 from the field howitzer FH77B known from Bofors.
  • the projectile is partially swung into a tube on a shell with the closure open and then pushed into the tube by the acceleration device.
  • the acceleration device comprises a hydraulic cylinder which is displaceable on a permanently mounted, continuous piston rod and which can be pivoted about the cylinder axis and carries a trough on one arm for filling the load. During the forward stroke of the cylinder, the projectile is rammed into the tube through the front end of the trough.
  • This known acceleration device requires a relatively large amount of space in the pipe axis direction behind the pipe end. The rear pipe end must therefore be arranged relatively high from the ground in order to enable large elevations. This is disadvantageous both for the stability of the gun, as well as for the camouflage and armor.
  • a device for automatically loading a gun is known from US-A 4,291,611. In this device, however, a bullet is not inserted into the gun barrel alone, but cartridge ammunition is inserted into the barrel of the barrel.
  • a working piston is rigidly connected to the piston rod.
  • the piston-side cylinder chamber is filled with compressed nitrogen, so that the cylinder unit acts as a gas pressure spring.
  • the piston rod is held in the tensioned, retracted position by a mechanically releasable pawl. After releasing the pawl, the gas pressure pushes the working piston and thus the piston rod forward. The front end of the piston rod pushes the cartridge into the chamber.
  • a rod-side connection of the cylinder unit is connected to a hydraulic pump cylinder, which is actuated by the pipe return. Since the piston of the pump cylinder does not move at the same time as the working piston of the cylinder unit during the forward stroke, an annular auxiliary piston which is acted upon by a second gas pressure spring with lower pressure can be displaced on the piston rod. The auxiliary piston can be pushed backwards as far as it will go on the working piston. After that, its displacement is limited by a plate spring assembly supported in the housing, which acts as an elastic stop during the working stroke of the working piston with the piston rod.
  • This device also requires a lot of space in the axial extension of the gun barrel, which leads to the same disadvantages that were mentioned above.
  • the present invention is based on the object of designing an acceleration device for a charging device for a gun for introducing a projectile into the gun barrel in such a way that it takes up little space behind the barrel end and can overcome high inertia forces without interference. This object is achieved by the features of the characterizing part of claim 1.
  • the solution according to the invention places the piston rod under tension during the working stroke of the cylinder unit, so that jamming or even kinking of the piston rod is completely avoided even in the fully extended position. Because the piston can be displaced to a limited extent relative to the piston rod, hydraulic end position damping for the piston rod is made possible, despite the fact that the piston side of the cylinder is connected to the atmosphere. In addition, the braking energy can be recuperated in that the oil displaced during braking can be introduced into a memory.
  • Fig. 1 the rear end of a gun barrel 50 and a loading device 51 is shown schematically.
  • a chamber 54 for the load and in front of it the barrel 52 of the tube is arranged.
  • a projectile 56 to be loaded is placed on a carriage 58.
  • the carriage 58 is guided on a guide 64 by means of rollers 62.
  • the carriage 58 is moved via an arm 60 by a hydraulic cylinder unit 2 arranged below the carriage, in which the piston rod 8 only protrudes from the cylinder 4 on one side.
  • the overall length of the loading device 51 corresponds approximately to the floor length.
  • the carriage 58 is strongly accelerated by the unit 2 over the relatively short distance d i .
  • the projectile 56 then flies over the distance d 2 in free flight and finally gets stuck in the barrel 52 of the tube. Large forces are required to accelerate. In order to avoid the risk of kinking of the piston rod 8, it is subjected to tension during the acceleration phase.
  • Fig. 2 shows the cylinder unit 4 with the associated control device.
  • a coaxial tube 10 is fastened, on which the piston 6 designed as an annular piston is guided in a sealing manner.
  • the interior 11 of the tube 10 communicates with a connection 12 for pressure fluid.
  • the piston 6 is axially displaceable relative to the piston rod 8 between two stops 13, 14.
  • a flange 16 is connected to the piston rod 8.
  • the flange 16 adjacent the end of the rod 8 slides with play in a cylindrical bore 17 of the piston 6.
  • a cylindrical shoulder 18 of the piston rod 8 penetrates into a bore 19 of the piston 6 with little play.
  • the piston rod 8 has a joint 61 at the free end for connection to the arm 60. In order to obtain a very small diameter, it has a bore 22, the diameter of which is larger than the outside diameter of the tube 10. Adjacent to the free end is in the Piston rod 8 is fastened by means of a pin 23 to a coaxial plunger 24 projecting into the tube 10. The cylinder chamber 21 communicates with a rod-side connection 25 of the cylinder 4.
  • the bore 22 of the piston rod 8 can be made with little play to the tube 10.
  • the plunger 24 and the pin 23 are omitted in this embodiment.
  • a cam 26 is connected to the piston rod 8 and actuates a limit switch 27.
  • the limit switch 27 is connected to the reset input R of a flip-flop 28.
  • the piston-side cylinder chamber 29 is connected to the atmosphere via a connection 30 and an air filter 31.
  • a plate spring assembly 32 rests on the cylinder base 9. This is held in place with a snap ring 33 and is used to brake the piston 6 in its retracted end position.
  • connection 25 is connected to a high-pressure accumulator 37 via a short line 35 of large diameter and a pilot-controlled check valve 36.
  • the valve 36 has an adjustable mechanical opening stroke limitation 38 and is controlled by a solenoid valve 39, which in turn is actuated by the flip-flop 28.
  • the accumulator 37 is connected to a pressure oil source P via a feed line 40 and a further solenoid valve 41. In its other switching position, the valve 41 connects the pressure oil source P to the connection 12 via a line 42.
  • the lines 40 and 42 are connected to one another via a check valve 43.
  • a branch line 44 leads from line 35 via a further solenoid valve 45 to a return R.
  • the described acceleration device works as follows: in the initial position shown, the piston 6 is at its right stop and the flange 16 is against the stop 14. The piston rod 8 is therefore fully extended.
  • the valve 39 is switched by a pulse to the set input S of the flip-flop 28, so that the pilot pressure opens the valve 36 up to the value set with the stroke limitation 38 in accordance with the projectile weight and / or the pipe elevation . This discharges the contents of the memory 37 into the cylinder space 21.
  • the piston 6 is accelerated to the left and pulls the piston rod 8 via the stop 14 and the flange 16, so that the slide 58 is accelerated.
  • the oil displaced by the plunger 24 in the space 11 is returned to the accumulator 37 via the check valve 43.
  • the piston 6 is braked at the end of the stroke by the plate springs 32. Since it has a relatively small mass, its braking distance can be measured briefly. As soon as the piston rod 8 has reached the position in which the piston 6 strikes the plate springs 32, the solenoid valve 39 is switched, since the limit switch 27 was actuated by the cam 26 shortly before. The valve 36 thus closes, and no more oil flows into the cylinder from the reservoir 37.
  • the piston rod 8 Due to the inertia of the carriage 58, the piston rod 8 still moves further to the left. The oil volume thus displaced is conveyed back into the reservoir 37 through the connection 25. The pressure of the oil flowing back must be somewhat higher than the pressure in the reservoir in order to be able to open the valve 36. Thus, the accumulator pressure acts as a braking pressure on the differential area between piston rod 8 and piston 24.
  • End position damping is provided so that the piston rod 8 cannot move to the stop 13 without braking during set-up operation or incorrect manipulation.
  • the attachment 18 penetrates into the bore 19, the oil displaced by the piston rod 8 only escapes via the throttle gap between the bore 19 and attachment 18.
  • valve 45 is opened and the valve 41 is switched over.
  • the plunger 24 now pushes the piston rod 8 to the right.
  • the valve 45 is switched off and the valve 41 is switched back to the basic position shown, in which it charges the accumulator 37 via the line 40.
  • hydraulic end position damping for the piston rod is made possible, despite the fact that the piston side of the cylinder 4 is connected to the atmosphere.
  • the braking energy can be recuperated in that the oil displaced during braking can be introduced into the memory.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)

Claims (10)

1. Dispositif d'accélération pour un dispositif de chargement d'un canon pour l'introduction d'un projectile (56) dans le tube (50) du canon, comportant un ensemble de cylindre hydraulique (2) comprenant un cylindre (4), un piston (6) et une tige de piston (8), caractérisé en ce que la tige de piston (8) sort seulement d'un côté du cylindre (4), qui comporte du côté de la tige un premier raccord (25) pour du liquide sous pression, la tige de piston (8) pouvant se déplacer avec limitation axiale des deux côtés par rapport au piston dans un alésage cylindrique (17) du piston actif (6), et le second raccord (30), situé du côté piston, du cylindre (4) étant relié à l'atmosphère.
2. Dispositif selon la revendication 1, dans lequel une butée élastique (32) est placée entre le piston (6) et le fond (9) du cylindre.
3. Dispositif selon la revendication 2, dans lequel la butée élastique comprend des ressorts Belleville (32).
4. Dispositif selon l'une des revendications 1 à 3, dans lequel le piston (6) est réalisé sous forme d'un piston annulaire et est guidé de façon étanche sur un tube (10) coaxial fixé au fond (9) du cylindre, et dans lequel un troisième raccord (12) relié à l'intérieur (11) du tube (10) peut recevoir du liquide sous pression (P).
5. Dispositif selon la revendication 4, dans lequel un piston plongeur coaxial (24) relié à la tige de piston (8) est guidé dans le tube (10).
6. Dispositif selon la revendication 4, dans lequel la tige de piston (8) est guidée de façon étanche sur le tube (10).
7. Dispositif selon l'une des revendications 1 à 6, dans lequel le premier raccord (25) est relié à un accumulateur de haute pression (37) par l'intermédiaire d'une soupape de commutation (36).
8. Dispositif selon la revendication 7, dans lequel la soupape de commutation (36) comporte une limitation d'ouverture (38) réglable.
9. Dispositif selon la revendication 7 ou 8, dans lequel la soupape (36) est commandée en fonction de la position de la tige de piston (8).
10. Dispositif selon la revendication 9, dans lequel la commande est effectuée électro-hydrauli- quement.
EP19870810521 1986-11-20 1987-09-14 Installation d'accélération pour le chargement d'un canon Expired - Lifetime EP0269560B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4648/86 1986-11-20
CH464886A CH664627A5 (de) 1986-11-20 1986-11-20 Beschleunigungseinrichtung fuer eine ladevorrichtung eines geschuetzes.

Publications (2)

Publication Number Publication Date
EP0269560A1 EP0269560A1 (fr) 1988-06-01
EP0269560B1 true EP0269560B1 (fr) 1990-04-18

Family

ID=4280045

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870810521 Expired - Lifetime EP0269560B1 (fr) 1986-11-20 1987-09-14 Installation d'accélération pour le chargement d'un canon

Country Status (4)

Country Link
EP (1) EP0269560B1 (fr)
CH (1) CH664627A5 (fr)
DE (1) DE3762373D1 (fr)
ES (1) ES2014036B3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3825662A1 (de) * 1988-07-28 1990-02-08 Wegmann & Co Geschossansetzer fuer artillerie
SE463945B (sv) * 1989-06-01 1991-02-11 Abbofors Ansaettare foer saadana artilleripjaeser som laddas med granat och drivkrutladdning var foer sig
DE19914663A1 (de) * 1999-03-31 2000-10-05 Krauss Maffei Wegmann Gmbh & C Geschoßansetzer für ein Artilleriegeschütz
DE19955234A1 (de) * 1999-11-17 2001-05-23 Krauss Maffei Wegmann Gmbh & C Geschoßansetzer für Artillerie
FR2824131B1 (fr) 2001-04-30 2003-12-26 Giat Ind Sa Dispositif de refoulement de projectiles

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4291611A (en) * 1979-10-18 1981-09-29 The United States Of America As Represented By The Secretary Of The Army Automatic loading device

Also Published As

Publication number Publication date
EP0269560A1 (fr) 1988-06-01
DE3762373D1 (de) 1990-05-23
ES2014036B3 (es) 1990-06-16
CH664627A5 (de) 1988-03-15

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