WO2007110140A1

WO2007110140A1 - Hydropneumatic braking and return system for barrel-recoil guns

Info

Publication number: WO2007110140A1
Application number: PCT/EP2007/002065
Authority: WO
Inventors: Norbert Kohnen
Original assignee: Rheinmetall Waffe Munition Gmbh
Priority date: 2006-03-24
Filing date: 2007-03-09
Publication date: 2007-10-04
Also published as: DE102006014155A1; EP1999426A1; US20090126558A1

Abstract

The invention relates to a hydropneumatic braking and return system for barrel-recoil guns having at least one working cylinder (1) which can be arranged between the gun barrel (6) of the gun and that mass (7) of the gun which does not recoil, contains a brake fluid (4) and has displaceable working pistons (3) which are arranged on a piston rod (2). In order to obtain a braking and return system of simple construction for barrel-recoil guns, with which it is simply possible, moreover, to take changes in different shooting parameters into consideration, the invention proposes to replace the braking cylinder of known systems with a simple working cylinder (1) having a working piston (3), wherein the working cylinder (1) is connected to a hydraulic accumulator (9) via a separate controllable pressure relief valve (10), wherein the pressure relief valve (10) can preferably be actuated in such a way that a substantially constant brake-force profile results during the recoil of the corresponding gun barrel (6).

Description

DESCRIPTION

Hydropneumatic braking and advancing system for pipe recoil guns

The invention relates to a hydropneumatic brake and Vorholsystem for pipe recoil guns.

In pipe recoil guns the deceleration of the returning gun barrel after firing usually by a hydraulic pipe brake (see, eg, Rheinmetall "Weapentechnisches Taschenbuch", 7th Edition 1985 pages 440ff.). In this case, in a liquid-filled brake cylinder connected to the returning mass of the gun When the return is complete, the returning mass is then forced back into its original position with the aid of a separate pipe harvester. hydropneumatic or mechanical system.

A disadvantage of the known systems of hydraulic pipe brake and pipe recuperator, among other things, that they are constructed mechanically very expensive. In order to maintain a constant brake force curve required for pipe brakes, for example, despite changing the recoil speed of the gun barrel, the flow cross section is path-dependent changed in the known pipe brakes. This is done e.g. by an annular gap between the hollow piston rod and a fixed control rod with axially changing diameter.

In addition, changing shooting parameters, such as the different pressure profiles when using different types of ammunition, can generally not be taken into account in a simple manner in the known tube brake and tube advance systems. Rather, in these cases are each consuming Einregulierungsversuche or possibly even the replacement of the pipe brakes or pipe recuperator required.

From DE 198 32 495 C1 it is already known, in a hydrodynamic tubular weapon damper with liquid flow control rod, as described in DE 38 24 153 A1 closer to taking into account the braking behavior of pipe brakes depending on various shooting parameters, such as ammunition type, propellant type, pipe elevation Tube running direction and temperature of the damping medium to use a magneto or electrorheological damping medium, the viscosity of which is variable by a corresponding control device.

Even with this known pipe brake, however, a relatively complicated mechanical design of the pipe brake is required to realize a dependent of the return flow cross-section.

The invention has for its object to provide a braking and Vorholsystem for pipe recoil guns, which is mechanically constructed much simpler than comparable known systems and with the changes in different shooting parameters are easily considered, without necessarily the viscosity of the brake fluid must be changed.

This object is achieved by the features of claim 1. Further, particularly advantageous embodiments of the invention disclose the dependent claims.

The invention is based essentially on the idea to dispense with a special brake cylinder with control rod for defining a dependent of the return flow cross-section and to replace the brake cylinder with a simple working cylinder with conventional working piston, the working cylinder via an external pressure relief valve and a hydraulic control circuit with a Hydraulic storage is connected. The pressure relief valve is manually adjustable to fixed values or by a e.g. electronically / electrically operable from a controller, such that preferably results in the return of the gun barrel, a substantially constant braking force.

The hydraulic accumulator comprises a hydraulic cylinder, in which a separating piston has a first chamber, which is connected to the pressure limiting valve, and a preloaded one Gas-filled second chamber separates, such that during the return movement of the gun tube from its rest position to its return end position by the displacement of the working piston, the displaced brake fluid from the working cylinder via the adjustable pressure relief valve in the first chamber and the gas in the second chamber of the Hydraulic accumulator is compressed by displacement of the separating piston. When relaxing the compressed gas, the brake fluid is then pushed back into the working cylinder and causes a flow of the gun barrel in its rest position, so that a separate Rohrvorholer can be omitted.

The hydraulic control circuit preferably comprises, in addition to the pressure limiting valve, inter alia at least one throttle valve with which the speed of the brake fluid flow forced back from the first chamber of the hydraulic cylinder back into the working cylinder can be changed in a predeterminable manner.

In the system according to the invention, therefore, the working cylinder and the working piston serve both as a pipe brake and as a pipe recuperator and heat balance system. Both the braking behavior as well as the forward speed and the preliminary braking are automatically controlled by the hydraulic control circuit manually and / or by a corresponding control device, so that the system can be adapted in a simple manner, inter alia, to different types of ammunition.

By dispensing with a control rod and the mechanical Rücklaufwegverstellme- mechanism within the brake cylinder also eliminates the need for conventional comparable pipe brakes consuming Einregulierungsversuche with which only the sufficiently accurate control profile is found and the mathematical pre-design of the corresponding control profile.

In addition, the system according to the invention has the advantage that the working cylinder can be made substantially smaller and lighter than conventional brake cylinder. It is therefore possible to install several cylinders in a weapons system to achieve more favorable forces profiles in the kraftableitenden components. The working cylinder can be arranged concentrically around the gun barrel, for example.

The hydraulic control circuit may be mounted on the gun. It can For example, but also be arranged on or in the carrier vehicle of the gun. This can result in benefits such as safety, mass distribution, maintenance and servicing.

Preferably, the system according to the invention is modular, so that it can be used with several weapon types and an individual construction (for each weapon its own pipe brake) can be omitted. This offers, among other advantages in logistics, development and certification of the system according to the invention.

Unlike in known pipe brakes, in which when changing the brake fluid usually due to the change in density (and the thus changed control profile), the control rod must be changed, this is not required in the system according to the invention. Rather, when changing the brake fluid in the system according to the invention, only the control of the pressure relief valve is changed. This can be done, for example, by changing the software of the pressure limiting valve-controlling electronic control device. The pressure relief valve is preferably always set to a certain pressure (opening pressure). This can be done once from the max. System pressure done. Damm arise different return paths at different shot parameters (eg size of the propellant, bullet type, pipe elevation). Alternatively, a shot is possible right before each shot. As a result, depending on the ammunition selection, the corresponding value for the opening pressure of the valve can be set. This value should preferably have been previously determined. The complete return path is also exploitable here and you get the lowest possible pressures.

If necessary, the hydraulic control circuit may additionally include a cooling system, e.g. a heat exchanger to cool the heated at the return and flow of the gun barrel brake fluid contained.

Further details and advantages of the invention will become apparent from the following with reference to a figure illustrated embodiment.

In the figure, 1 denotes a working cylinder which comprises a piston 3 attached to a piston 2. In the working cylinder 1 is a brake fluid 4 (eg oil). The piston rod 2 is remote on its the working piston 3 End connected to the bottom piece 5 of a gun barrel 6 shown in dashed lines (returning mass of the gun) and the working cylinder 1 with a likewise indicated by dashed cradle 7 of the corresponding gun (non-returning mass).

The working cylinder 1 is connected via a hydraulic control circuit 8 indicated only schematically with a hydraulic accumulator 9. In this case, the control circuit includes

8 a pressure relief valve 10, which can be controlled or regulated by an electronic control device 11. The electronic control device can be, for example, the fire control computer of the corresponding weapon system.

The hydraulic accumulator 9 includes a hydraulic cylinder 12 in which a separating piston 13 separates a first chamber 14 connected to the hydraulic control circuit 8 from a second chamber 16 filled with a biased gas 15 (e.g., nitrogen).

When firing the gun barrel 6 runs from its rest position shown in FIG. In the direction of arrow 17 in its return end position. In this case, the working piston 3 is also displaced in the direction of arrow 17 and thereby displaced brake fluid 4 from the working cylinder 1 via the adjustable pressure relief valve 10, where the back pressure arises, the hydraulic control circuit 8 is pressed into the first chamber 14 of the hydraulic accumulator 9. This causes a displacement of the separating piston 13, so that the gas 15 in the second chamber 16 of the hydraulic accumulator

9 is compressed until the gun barrel 6 has reached its return end position.

After reaching the return end position of the gun barrel 6, the gas 15 relaxes again and shifts the separating piston 13 until the gas 15 has relaxed to its initial pressure. By displacement of the separating piston 13, the brake fluid 4 is pushed back from the first chamber 14 of the hydraulic accumulator 9 in the working cylinder 1 and causes a flow of the gun barrel 6 in its rest position. In this case, the advance speed can be controlled or regulated by a provided in the hydraulic control circuit 8 throttle valve 18 manually or by means of the electronic control device 11.

A recognizable in the Fig. 19, designated directional control valve is primarily for switched the pipe flow. Previously, it prevents a flow of brake oil through the throttle 18. The throttle valve 18 is closed in the basic position and is then turned on when the brake pressure exceeds the system pressure (accumulator pressure).

When using multiple cylinders alternative variants are possible: several cylinders and a memory and a circuit, or more cylinders, multiple memory and a circuit, or more cylinders, associated memory and the associated circuit (as a unit = Bremsvorholmodul).

Of course, the invention is not limited to the embodiment described above. For example, the hydraulic control circuit may additionally include a cooling system, e.g. a heat exchanger to cool the heated at the return and flow of the gun barrel brake fluid contained. Here, the cooler not described in detail is preferably to be incorporated into the line in which the lowest pressure occurs (for example, Stromreglerleitung) to run the cooler as small as possible.

In addition, the working cylinder can be provided with both "pulling" and "pushing" piston rod.

Furthermore, the control of the pressure limiting valve does not necessarily have to be such that results in a constant brake force curve, but, if desired, a largely arbitrary braking force profile can be generated by appropriate control of the pressure relief valve.

LIST OF REFERENCE NUMBERS

1 working cylinder

2 piston rod

3 working pistons

4 brake fluid

5 bottom piece

6 gun barrel

7 cradle, non-returning mass

8 control circuit

9 hydraulic accumulators

10 Pressure relief valve, actuator

11 control device

12 hydraulic cylinders

13 separating piston

14 (first) chamber

15 gas

16 (second) chamber

17 arrow

18 throttle valve, actuator

19 way valve

Claims

claims

1. Hydropneumatic brake and Vorholsystem for pipe recoil guns with the features:

a) the system comprises at least one between the gun barrel (6) of the gun and the non-returning mass (7) of the gun can be arranged, a brake fluid (4) containing working cylinder (1) arranged on a piston rod (2) slidable working piston (3) ;

b) the working cylinder (1) is connected via at least one adjustable pressure limiting valve (10) of a hydraulic control circuit (8) with a hydraulic accumulator (9);

c) the hydraulic accumulator (9) comprises a hydraulic cylinder (12) in which a separating piston (13) has a first chamber (14) connected to the hydraulic control circuit (8) by a second chamber (16) filled with a prestressed gas (15). separates, such that during the return movement of the gun barrel (6) from its rest position to its return end position by the displacement of the working piston (3) the displaced brake fluid (4) from the working cylinder (1) via the controllable pressure relief valve (10) in the pressed first chamber (14) and the gas (15) in the second chamber (16) of the hydraulic accumulator (9) by displacement of the separating piston (13) is compressed and that when relaxing the compressed gas (15), the brake fluid (4) in the Working cylinder (1) is pushed back and causes a flow of the gun barrel (6) in its rest position.

2. A hydro-pneumatic braking and Vorholsystem according to claim 1, characterized in that the hydraulic control circuit (8) comprises at least one throttle valve (18), with which the speed of the first chamber (14) of the hydraulic accumulator (9) in the working cylinder ( 1) pushed back brake fluid flow is changeable in a predeterminable manner.

3. Hydro-pneumatic braking and Vorholsystem according to claim 1 or 2, characterized in that the hydraulic control circuit (8) comprises a cooling system.

4. Hydropneumatic braking and Vorholsystem according to one of claims 1 to 3, characterized in that the hydropneumatic brake and Vorholsystem several circumferentially, uniformly around the gun barrel (6) distributed around arranged working cylinder (1).

5. Hydropneumatic braking and Vorholsystem according to one of claims 1 to 4, characterized in that the actuators (10, 18) of the hydraulic control circuit (8) via a central electronic control device (11) are controllable.

6. Hydropneumatic brake and Vorholsystem according to claim 5, characterized in that the pressure limiting valve (10) in such a way from the electronic control device (11) can be controlled, that results in the return of the corresponding gun barrel, a substantially constant braking force.