• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:SE534045C2
    申请号:SE0802578
    申请日:2008-12-16
    公开日:2011-04-12
    发明作者:David Andrew Eaglestone；Stephen Wildgoose
    申请人:Bae Systems Plc；
    IPC主号:
    专利说明:

    It is therefore an object of the invention to provide an interface between the barrel and the cradle which is not only resistant to firing torque but which also leaves the back piece easily accessible for charging by an operator.
    Thus, a gun is provided comprising: a barrel defining a barrel axis and having an external barrel surface along the circumference of the barrel; a cradle having a cradle tube for housing a portion of the barrel, the barrel being slidably mounted in the cradle so that the barrel can move relative to the cradle along the barrel axis over a range of barrel positions, an interface defined by the slidable contact between (i) prevents rotation of the barrel relative to the cradle about the barrel axis, and ii) is maintained in a portion of the barrel over the entire range of barrel positions, characterized in that the interface has a polygonal interface.
    Advantageously, this provides a means which at the same time leads the recoil of the barrel and prevents the firing moment but still leaves the back piece available to operators.
    Preferably, the interface has a regular polygonal cut.
    A fire tube with a regular polygonal section (for example octagonal) is advantageously replaceable with a fire tube that is circular for an equivalent diameter, there is only a negligible difference in strength, without a significant difference in weight.
    A particular embodiment of the invention will now be described with reference to the following figures, of which: Figure 1 shows a geometric view of a cannon cradle in the prior art, Figure 2 shows a geometric view of an exemplary field cannon with the barrel at a point of maximum recoil, Figure 3 shows a geometric view of a barrel which can be used in the field gun of Figure 2, the barrel having an external octagonal portion towards the end of the chamber, Figure 4 shows a section of the gun of Figure 1 through the line AA, and Figure 5 shows a section through a cylindrical barrel of a cannon in the prior art, the barrel of the cannon being of the same caliber as the barrel of Figure 4.
    Referring to Figure 2, a howitzer is shown (alternatively referred to as a field cannon). The hubits 100 are provided with a barrel 300, a cradle 2 and hydraulic dampers l2a and l2b. The barrel 300 is slidably mounted inside the cradle 2 so that the barrel 300 relative to the cradle 2 can slide along a barrel shaft 14 defined by the barrel 300. the cradle 2 is substantially hollow and as such defines a hole in which the barrel 300 is coaxially housed. The barrel has a groove along a hole 8.
    A first and second elongate hydraulic dampers 12a and 12b are located parallel to the barrel shaft 14, fixed at one end to the cradle 2 and at the other end to the rear piece 6 of the barrel 300.
    The hydraulic dampers 12a and 12b consist of an extendable piston and cylinder unit. These dampers 12a, 12b are arranged so that when the barrel 300 is in a fully recoiled state (as shown in Figure 2) the damper tends to be completely extended. the fire tube 300 is in its firing position, the piston is retracted into the cylinder and thus the dampers 12a, 12b tend to be minimally extended. Referring also to Figures 3 and 4, it can be seen that the barrel 300 has a collar portion 4 against a rear piece 6.
    The collar portion 4 externally has an octagonal profile and has a minimum diameter X larger than the largest diameter of the cylindrical portions of the barrel. The collar portion 4 is intended to run in an surface of the cradle 2 to provide an interface which is clearly shown in figure 4. This interface is maintained at a single portion of the cradle tube over the entire range of fire tube positions.
    From Figure 2 it can be seen that even when the barrel 300 is in its position with the greatest recoil, there is an interface portion between the barrel 4 collar 4 and a portion 12 of the cradle 2. When the barrel is in the equilibrium position, the cradle portion 12 still maintains the interface 10, but in the equilibrium position runs through another part of the part of the barrel of the barrel 12. the par of the cradle 2 which provides this maximum recoil interface therefore maintains the interface 10 over the entire range of positions of the barrel.
    In use, the interface 10, which defines a surface having a constant section octagonal profile, allows the barrel to slide through the cradle 2 along the barrel shaft 14 over a range of barrel positions. Sliding bearings (not shown) can, for example, be provided to facilitate such sliding movement. Such sliding would contribute to the cannon's recoil housing mechanism. The interface 10 also acts to prevent the barrel from rotating about the barrel shaft 14 relative to the cradle 2: it is non-circular, so external surfaces of the barrel would abut internal surfaces of the cradle at the moment the barrel attempts to rotate. Firing torque is therefore transmitted from the barrel to the cradle and on to the entire field cannon. In relation to the barrel, the field cannon has a large moment of inertia and therefore all distortions are attenuated.
    It has been established by experimentation performed by applicants that barrels with octagonal external sections (with minimum diameter X and a maximum diameter Y) and circular internal sections (from now on referred to as octagonal barrels) are strong enough to replace barrel pairs annular cross-section (such as that shown in Figure 5) provided that the average diameter of the octagonal barrel is equal to the outer diameter Z of the annular barrel. In other words, provided that: (X * Y) * 0.5 = Z, where both barrels have the same caliber, the peak loads differ due to internal firing pressure and grouting by a negligible amount.
    Values of Z for various annular barrels are known to those skilled in the art.
    The exact dimensions of the barrel and, for that matter, the material from which the barrel is manufactured will be determined in accordance with the desired length of service and the caliber of the ammunition. The choice of an octagonal section over a circular section does not significantly change the weight of the howitzer.
    Possible materials from which the barrel can be made include steel alloy.
    While an octagonal interface has been described above, the invention is in no way limited to this form. Any other non-circular shape such as ellipses, regular polygons, irregular polygons would also be within the scope of the invention.
    A further variant within the scope of the invention occurs if the collar 4 of the barrel does not have a constant external cut along its length but is provided with projections on the side to further facilitate the sliding mechanism.
    Other variants would be obvious to a person skilled in the art.
    权利要求:
    Claims (4)
    [1]
    A cannon (100) comprising: a barrel (300) defining a shaft (14) and having an external barrel surface along the circumference of the barrel (300), a cradle (2) having a cradle for housing a portion of the barrel ( 300), the barrel (300) being slidably mounted in the cradle so that the barrel (300) can move relative to the cradle (2) along the barrel axis (14) over a range of barrel positions, an interface (10) defined by the the slidable contact between the external barrel surface and the cradle tube i) prevents rotation of the barrel (300) relative to the cradle (2) about the barrel axis (300), ii) is maintained in a portion of the cradle over the entire range of positions of the barrel (300), and k characterized in that the interface (10) has a polygonal interface.
    [2]
    The cannon (100) of claim 1, wherein the polygonal section is in the form of a regular polygon.
    [3]
    The gun (100) of claim 2, wherein the polygonal section is octagonal.
    [4]
    A cannon (100) according to any one of the preceding claims, wherein the interface (10) has a constant section along the portion of the barrel to which the cradle is peripheral.
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    同族专利:
    公开号 | 公开日
    IT1398019B1|2013-02-04|
    CA2645609A1|2009-08-13|
    AU2008252017A1|2009-07-09|
    SE0802578A1|2010-06-17|
    US20100011951A1|2010-01-21|
    US7971517B2|2011-07-05|
    DE102008062093A1|2009-10-08|
    DE102008062093B4|2010-12-09|
    FR2930816A1|2009-11-06|
    ITWX20080023A1|2009-06-22|
    GB0822990D0|2009-04-29|
    GB2456036A|2009-07-01|
    GB2456036B|2010-06-16|
    GB0725247D0|2009-04-29|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US442919A|1890-12-16|schneider |
    FR657123A|1926-12-04|1929-05-22|Bofors Ab|Artillery piece in which the tube recedes on a cradle|
    US3026777A|1958-05-02|1962-03-27|Iii Thomas R Wooderson|Automatic firing mechanism|
    US4269109A|1979-03-27|1981-05-26|Ares, Inc.|Open-framework receiver automatic cannon|
    DE3150250C2|1981-12-18|1990-05-03|Ina Waelzlager Schaeffler Kg, 8522 Herzogenaurach, De|
    FR2549557B1|1983-07-20|1987-10-16|Mte|MULTI-RATE HYDRAULIC ENERGY DISSIPATOR|
    US4690032A|1983-12-08|1987-09-01|Ares, Inc.|Breech/receiver assembly for automatic cannons|
    US4867040A|1987-11-02|1989-09-19|Barrett Ronnie G|Self-unlocking device for recoiling bolt carrier and barrel in a semi-automatic rifle|
    DE3936454A1|1989-11-02|1991-05-08|Rheinmetall Gmbh|GUN PISTON STORAGE|
    US6200225B1|1998-09-04|2001-03-13|Trw Inc.|Variable length shaft assembly having a bearing system|
    FR2797040B1|1999-07-26|2001-09-14|Giat Ind Sa|GUIDANCE SYSTEM FOR THE RECIPIENT MASS OF AN ARTILLERY|
    DE10226534B4|2002-06-14|2004-06-24|Rheinmetall W & M Gmbh|barreled weapon|
    US20070256345A1|2006-05-04|2007-11-08|Hall David R|A Rigid Composite Structure with a Superhard Interior Surface|
    RU2312295C1|2006-05-26|2007-12-10|Валерий Адамович Ковальчук|Small arms with moving barrel|DE102012106626B3|2012-07-20|2013-09-26|Krauss-Maffei Wegmann Gmbh & Co. Kg|Weapon platform, military vehicle with a weapons platform and method of operating a weapons platform|
    JP2017129306A|2016-01-20|2017-07-27|晃久 古庄|Low reaction gun firearm|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    GB0725247A|GB0725247D0|2007-12-21|2007-12-21|Gun Recoil|
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