US20060225565A1 - High pressure hydraulic breech mechanisms - Google Patents
High pressure hydraulic breech mechanisms Download PDFInfo
- Publication number
- US20060225565A1 US20060225565A1 US11/390,091 US39009106A US2006225565A1 US 20060225565 A1 US20060225565 A1 US 20060225565A1 US 39009106 A US39009106 A US 39009106A US 2006225565 A1 US2006225565 A1 US 2006225565A1
- Authority
- US
- United States
- Prior art keywords
- fluid
- vent
- annular chamber
- high pressure
- seal
- 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.)
- Abandoned
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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
- F41A3/00—Breech mechanisms, e.g. locks
- F41A3/64—Mounting of breech-blocks; Accessories for breech-blocks or breech-block mountings
- F41A3/78—Bolt buffer or recuperator means
- F41A3/90—Fluid buffers
Definitions
- the present invention relates to an improvement to high pressure hydraulic breech mechanisms for all classes of firearm.
- a further disadvantage is that the reciprocating parts have a thin film of fluid on them that attracts sand, mud and similar abrasive substances causing wear and erroding the close tolerances leading to excess fluid migration.
- an annular chamber or enlargement of the clearance between two components of a high pressure hydraulic breech located between a body of fluid and a sealing means for containing the fluid, provided with a vent such that fluid migrating along the clearance void between two components will on entering the annular chamber no longer be subject to high pressures and therefore cannot subject the sealing means to high pressures.
- the clearance between components may be increased up to 0.02 millimeters and even at this size sufficient flow rate along the void, during the few milliseconds of peak pressure, to permit unsafe movement of the bolt in relation to the barrel cannot be achieved.
- Another advantage is that the seals will remove the fluid film from reciprocating parts and wipe off any foreign matter preventing the ingress of damaging material into the hydraulic mechanism.
- the annular chamber communicates via the vent directly or indirectly with the low pressure reservoir of the hydraulic breech mechanism so that any fluid passing through the annular chamber is returned to the reservoir.
- vent discharges any fluid outside the envelope of the breech mechanism.
- vent discharges into a seperate reservoir.
- FIG. 1 is a schematic cross section through a hydraulic breech mechanism in the locked position
- FIG. 2 is a schematic cross section through a hydraulic breech mechanism along the line A-A.
- a typical high pressure hydraulic breech mechanism is shown in FIG. 1 and comprises an outer casing 1 forming the wall of a low pressure reservoir 14 , the high pressure cylinder 3 defines a high pressure reservoir 13 and a sleeve valve 2 closes ports 4 seperating the high pressure reservoir 13 from the low pressure reservoir 14 .
- the barrel extension 6 is secured to the high pressure cylinder 3 and the incompressible nature of the fluid sealed in the high pressure reservoir 13 will secure or lock the bolt 10 in relation to the barrel extension 6 against the forces of firing.
- On firing a force will be applied to the bolt 10 due to gas pressure generated by the cartridge and the bolt 10 will transmit force to the fluid in high pressure reservoir 13 .
- the fluid being incompressible will tend to migrate along the radial gap between the bolt 10 and the high pressure cylinder 3 , fluid in the radial gap will be subject to the same pressure as that in the high pressure reservoir 13 .
- seal 8 and wipe ring 9 On entering the annular chamber 7 the pressure is released as the fluid is no longer confined but can flow freely through vent 11 back into the low pressure reservoir 14 .
- a seal 12 permits the vent tube 11 to reciprocate without fluid migrating from the low pressure reservoir 14
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Pressure Vessels And Lids Thereof (AREA)
Abstract
By providing an annular chamber 7 and a vent 11 to the radial gap between bolt 10 and high pressure cylinder 3, located between a seal 8 and a body of fluid 13 the operating range of the seal 8 cannot be exceeded. The flow rate of fluid from reservoir 13 into annular chamber 7 is restricted by the radial gap between bolt 10 and high pressure cylinder 3. The cross sectional area of both annular chamber 7 and vent 11 are greater than that of the radial gap between bolt 10 and high pressure cylinder 3 therefore fluid cannot enter annular chamber 7 at sufficient rate to cause a pressure rise in annular chamber 7 thus seal 8 is isolated from fluid at pressures above its safe operating range. Similar protection may be applied to any seal in the mechanism.
Description
- The present invention relates to an improvement to high pressure hydraulic breech mechanisms for all classes of firearm.
- In a typical hydraulically locked breech mechanism the forces generated on firing can subject the fluid in the locking mechanism to pressures in excess of 2000 bar for a few milliseconds. This pressure surge is significantly greater then the operating range of conventional seals such as O rings. However by reducing the clearance between components to a minimum, typically 0.005 millimeter fluid migration is effectively prevented.
- A disadvantage is the high level of precision required in manufacture and assembly required to achieve these small clearances
- A further disadvantage is that the reciprocating parts have a thin film of fluid on them that attracts sand, mud and similar abrasive substances causing wear and erroding the close tolerances leading to excess fluid migration.
- According to the present invention there is provided an annular chamber or enlargement of the clearance between two components of a high pressure hydraulic breech, located between a body of fluid and a sealing means for containing the fluid, provided with a vent such that fluid migrating along the clearance void between two components will on entering the annular chamber no longer be subject to high pressures and therefore cannot subject the sealing means to high pressures.
- Providing the cross sectional area of both the annular chamber and vent are greater than that of the clearance void between two components then the flow rate of fluid through the void is less than that which can be achieved through the annular chamber and vent. Therefore pressure on the fluid in the void is released upon hte fluid entering the annular chamber, thus the sealing means are protected by the pressure reducing effect of the vented annular chamber. Using conventional sealing means the clearance between components may be increased up to 0.02 millimeters and even at this size sufficient flow rate along the void, during the few milliseconds of peak pressure, to permit unsafe movement of the bolt in relation to the barrel cannot be achieved.
- Advantageously the use of conventional sealing means eases manufacture by increasing acceptable tolerances.
- Another advantage is that the seals will remove the fluid film from reciprocating parts and wipe off any foreign matter preventing the ingress of damaging material into the hydraulic mechanism.
- In one embodiement the annular chamber communicates via the vent directly or indirectly with the low pressure reservoir of the hydraulic breech mechanism so that any fluid passing through the annular chamber is returned to the reservoir.
- In a second embodiement the vent discharges any fluid outside the envelope of the breech mechanism.
- In a third embodiement the vent discharges into a seperate reservoir.
- The present invention will now be described by way of example with reference to the accompanying drawings in which:—
-
FIG. 1 is a schematic cross section through a hydraulic breech mechanism in the locked position -
FIG. 2 is a schematic cross section through a hydraulic breech mechanism along the line A-A. - A typical high pressure hydraulic breech mechanism is shown in
FIG. 1 and comprises anouter casing 1 forming the wall of alow pressure reservoir 14, thehigh pressure cylinder 3 defines ahigh pressure reservoir 13 and asleeve valve 2closes ports 4 seperating thehigh pressure reservoir 13 from thelow pressure reservoir 14. Thebarrel extension 6 is secured to thehigh pressure cylinder 3 and the incompressible nature of the fluid sealed in thehigh pressure reservoir 13 will secure or lock thebolt 10 in relation to thebarrel extension 6 against the forces of firing. On firing a force will be applied to thebolt 10 due to gas pressure generated by the cartridge and thebolt 10 will transmit force to the fluid inhigh pressure reservoir 13. The fluid being incompressible will tend to migrate along the radial gap between thebolt 10 and thehigh pressure cylinder 3, fluid in the radial gap will be subject to the same pressure as that in thehigh pressure reservoir 13. - On entering the
annular chamber 7 the pressure is released as the fluid is no longer confined but can flow freely throughvent 11 back into thelow pressure reservoir 14. Theannular chamber 7 by seperatingseal 8 andwipe ring 9 from the region off highpressure permits seal 8 andwipe ring 9 to operate within acceptable pressure limits. - Any other seals such as 5 may be protected in a similar way. A
seal 12 permits thevent tube 11 to reciprocate without fluid migrating from thelow pressure reservoir 14
Claims (4)
1) An annular chamber or enlargement of the clearance void between two components of a high pressure hydraulic breech mechanism, located between a body of fluid and sealing means for containing the fluid, and provided with a vent such that fluid migrating along the clearance void between two components will, on entering the annular chamber, no longer be subject to high pressures and cannot therefore subject the sealing means to high pressures.
2) An annular chamber and vent as claimed in claim 1 wherein the vent communicates directly or indirectly with the low pressure reservoir of a hydraulic breech mechanism such that any fluid passing through the vent is returned to the low pressure reservoir.
3) An annular chamber and vent as claimed in claim 1 wherein the vent discharges any fluid outside the envelope of the breech mechanism.
4) An annular chamber and vent as claimed in claim 1 wherein the vent communicates with a discreet reservoir that collects any fluid discharged from the vent
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0507382A GB2425162B (en) | 2005-04-12 | 2005-04-12 | An improvement to high pressure hydraulic breech mechanisms |
GB0507382.0 | 2005-04-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060225565A1 true US20060225565A1 (en) | 2006-10-12 |
Family
ID=34610997
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/390,091 Abandoned US20060225565A1 (en) | 2005-04-12 | 2006-03-28 | High pressure hydraulic breech mechanisms |
Country Status (3)
Country | Link |
---|---|
US (1) | US20060225565A1 (en) |
EP (1) | EP1712869A1 (en) |
GB (1) | GB2425162B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080204384A1 (en) * | 2007-02-23 | 2008-08-28 | Lee Jae-Sung | Organic electroluminescence display (OELD) and driving methods thereof |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2789472A (en) * | 1954-06-28 | 1957-04-23 | Warlick Frank | Hydraulic breech control system |
US2823587A (en) * | 1942-11-28 | 1958-02-18 | George A Chadwick | Loading and ramming mechanism for semi-automatic guns |
US5544563A (en) * | 1992-12-09 | 1996-08-13 | Vickers Shipbuilding & Engineering Ltd. | Primer cartridge leader for guns |
US20060254109A1 (en) * | 2005-02-03 | 2006-11-16 | Diehl Bgt Defence Gmbh & Co., Kg | Mechanical initiating system for caseless ammunition |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB139541A (en) * | 1918-12-10 | 1920-03-11 | Hugh William Maunsell Gabbett | Improvements in automatic firearms |
DE737264C (en) * | 1936-11-08 | 1943-07-09 | Krupp Ag | Self-acting firearm with a piston lock with barrel recirculation and pre-retrieval device |
CH543722A (en) * | 1971-08-26 | 1973-10-31 | Karlsruhe Augsburg Iweka | Device for gas-tight sealing of a parting line, especially for revolver cannons with high ballistic performance |
DE3234638C1 (en) * | 1982-09-18 | 1991-01-03 | Diehl Gmbh & Co | Sealing for differential pressure piston combustion chamber systems of barrel weapons |
DE3838799C2 (en) * | 1988-11-17 | 1997-06-26 | Rheinmetall Ind Ag | Sealing configuration for an automatic barrel weapon and tool for assembly or disassembly |
SE8901626L (en) * | 1989-05-09 | 1990-11-10 | Bofors Ab | DEVICE FOR THE MANAGEMENT OF MOVEMENT PROCEDURE IN A RULE-CALIBRATED ELVEST, PARTLY FOR AN AMMUNITION UNIT UNDER ITS EMPLOYMENT IN THE ELVEN, PARTS FOR THE SHELTER OF THE AMMUNITION UNIT FOR THE RELEASE |
DE3935314C2 (en) * | 1989-10-24 | 1998-02-19 | Diehl Gmbh & Co | Sealing arrangement |
-
2005
- 2005-04-12 GB GB0507382A patent/GB2425162B/en not_active Expired - Fee Related
-
2006
- 2006-03-28 US US11/390,091 patent/US20060225565A1/en not_active Abandoned
- 2006-04-10 EP EP06007489A patent/EP1712869A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2823587A (en) * | 1942-11-28 | 1958-02-18 | George A Chadwick | Loading and ramming mechanism for semi-automatic guns |
US2789472A (en) * | 1954-06-28 | 1957-04-23 | Warlick Frank | Hydraulic breech control system |
US5544563A (en) * | 1992-12-09 | 1996-08-13 | Vickers Shipbuilding & Engineering Ltd. | Primer cartridge leader for guns |
US20060254109A1 (en) * | 2005-02-03 | 2006-11-16 | Diehl Bgt Defence Gmbh & Co., Kg | Mechanical initiating system for caseless ammunition |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080204384A1 (en) * | 2007-02-23 | 2008-08-28 | Lee Jae-Sung | Organic electroluminescence display (OELD) and driving methods thereof |
Also Published As
Publication number | Publication date |
---|---|
EP1712869A1 (en) | 2006-10-18 |
GB2425162B (en) | 2007-04-11 |
GB0507382D0 (en) | 2005-05-18 |
GB2425162A (en) | 2006-10-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |