• 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:SE534168C2
    申请号:SE1000178
    申请日:2010-02-25
    公开日:2011-05-17
    发明作者:Lennart Gustavsson
    申请人:Bae Systems Bofors Ab；
    IPC主号:
    专利说明:

    OBJECT OF THE INVENTION AND ITS FEATURES A principal object of the present invention is an improved spark plug which can withstand large mechanical stresses without breaking.
    A further object of the present invention is an ignition screw, where the gas flow can be easily adjusted with regard to different propellant charges.
    Said objects, as well as other objects not listed here, are satisfied in a satisfactory manner, by what is stated in the present independent patent claims.
    Embodiments of the invention are set out in the dependent claims.
    Thus, according to the present invention, there is provided an ignition screw for use in an ammunition unit comprising a grenade and a cartridge case for igniting a propellant charge provided in the cartridge case, the igniter screw comprising a combustion chamber comprising a pyrotechnic charge, and an expansion chamber comprising gas expansion chambers are designed to withstand large mechanical stresses.
    Characteristic of the ignition screw is that the expansion chamber is designed as a helical spring type where the gap between the winding turns of the tension spring constitutes the ignition screw's gas outlet to the surrounding propellant charge. According to further aspects of the ignition screw: the tension spring is designed so that the tension spring is initial. that with increasing gas pressure in the expansion chamber is successively opened, that the winding turns of the tension spring are formed with a square cross-section for effective sealing against surrounding propellant charge when the gas outlet is closed, that the tension spring also comprises gas channels radially arranged in the contact surfaces between the winding turns. a sealing part for sealing against the surrounding propellant charge, that the rear end of the tension spring is formed with a press socket for mounting the tension spring in the combustion chamber, that the press socket of the tension spring is conically shaped, that the rear end of the tension spring is mounted to the combustion chamber via an adapter, one end of the adapter being mounted to the tension spring via a press socket and the other end of the adapter being mounted to the combustion chamber via a threaded connection, the tension spring having a spring constant selected so that the gas outlets between winding turns increase linear with rising gas pressure.
    According to the present invention, there has also been provided an ammunition unit arranged for said igniter screw.
    Characteristic of the ammunition unit is that the ammunition unit comprises a holder in the form of a cylinder fixedly arranged in the front part of the grenade sleeve in connection with the rear end of the grenade, the front part of the tension spring being movably arranged in the cylinder so that the tension spring can move freely forward and backwards in the cartridge case when pressurizing the tension spring.
    ADVANTAGES AND EFFECTS OF THE INVENTION The invention entails a number of advantages and effects: Through the unique construction where the ignition screw expansion chamber is designed as a tension spring, which is flexible both in axial and radial direction, a mechanically stable ignition screw is provided that can withstand large mechanical stresses without going broken.
    By the function of the tension spring to expand longitudinally at pressurization, whereby the space between the winding turns of the tension spring forms the gas outlet of the ignition screw, a simple and inexpensive ignition screw construction is achieved. As the gap between the winding turns increases with increasing gas pressure, a variable gas flow out of the ignition screw is also made possible and thus the possibility of controlling the gas flow to the propellant charge. By selecting material in the spring, pitch angle and cross-sectional area for the winding turns, the gas flow can also be optimized. .
    The basic idea behind the invention is thus a mechanically flexible ignition screw that can withstand large mechanical stresses, which arise, for example, in connection with a charging process or during transport of ammunition units in a combat vehicle.
    A further idea of the invention is that the gas flow of the ignition screw should be easily adjustable with respect to different propellant charges.
    Additional advantages and effects will become apparent upon study and consideration of the following detailed description of the invention when taken in conjunction with the accompanying drawings; Fig. 1 schematically shows a longitudinal section of an ammunition unit comprising an ignition screw 'whose expansion chamber consists of a helical spring type, Fig. 2 shows a side view of the ignition screw according to Fig. 1, Fig. 3 shows a part of the tension spring according to Fig. 2, Fig. 4 shows a part of the tension spring according to Fig. 2, the spring being in open position, Fig. 5 shows a special embodiment of the tension spring according to Fig. 2, where the spring is formed with a square cross-section with radially arranged gas channels in the contact surfaces between the winding turns of the spring.
    DETAILED DESCRIPTION OF THE DESCRIPTION Figure 1 shows an ammunition unit 1, comprising a grenade 3 and a cartridge case 2 and a propellant charge 4 arranged in the cartridge case 2. The propellant charge 4 is intended for propelling the grenade 3 when fired from a cannon barrel NC) powder. Other types of cannon powder are also possible. The grenade 3, which may be an armored explosive device, is not described in more detail here.
    In the cartridge case 2 there is also arranged an ignition screw 5 for igniting the propellant charge 4. The ignition screw 5 consists essentially of two parts, a combustion chamber 6 arranged in the rear plane of the cartridge sleeve 2, and an elongated expansion chamber 7 connected to the combustion chamber 6. The expansion chamber 7 is extends centrally through the entire propellant charge 4 to the front part of the cartridge case 2. The combustion chamber 6 comprises a pyrotechnic charge 8, also called a firing charge, which upon initiation generates a high-pressure combustion gas, which combustion gas is forced into the expansion chamber 7 via an intermediate connection by the action of the gas pressure. The initiation of the firing charge 8 takes place via an initiation device of known type which is not described in more detail here. The expansion chamber 7 comprises gas outlets 9 arranged in the outer surface of the expansion chamber 7, through which outlet holes 9 the ignition gas is distributed over the surface of the surrounding propellant charge 4.
    The ignition screw 1 according to Figures 1 and 2 differs from a conventional ignition screw in that the expansion chamber 7 of the ignition screw 5 is designed as a cylindrical helical spring, also called a coil-type tension spring.
    The tension spring is fixedly connected to the combustion chamber 6, via a mounting adapter 14. Alternatively, the tension spring can be connected directly to the combustion chamber 6, for example via a threaded connection. One end of the adapter 14 is mounted to the combustion chamber 6, preferably, via threading, or alternatively via a press socket. The second end of the adapter 14 is mounted to the rear end of the tension spring, preferably, via a press socket, or alternatively via threaded joints or adhesive joints.
    The front end of the tension spring comprises a sealing part 15, preferably, in the form of a sealing plug. The sealing part 15 can also consist of a conical taper of the end end of the tension spring.
    The function of the sealing part 15 is: partly to prevent surrounding propellant 4 from leaking into the tension spring, partly to absorb gas pressure in the axial direction so that the spring can expand axially with increasing gas pressure. The tension spring is a known component that is used in various technical applications and is available in different designs, which is why it is not described in more detail here. 534 'IBS _ 7 _ The tension spring in figure 2 functions so that the tension spring is extended in axial joint A with rising gas pressure, from a closed position where the winding turns 10 of the tension spring abut each other, figure 3, to an open position where the winding turns 10 have moved away from each other whereby an intermediate run 9 is formed, see figure 4. The space 9 between the winding turns 10 constitutes the gas outlet 9 of the ignition screw 5, through which the ignition gas from the combustion chamber 6 is distributed over the surrounding propellant charge 4.
    The gas flow depends partly on the gas pressure in the tension spring, and partly on the properties of the tension spring such as the spring constant of the spring, degree of inclination, number of winding turns, material and dimension. By the amount and type of ignition gun, it is possible to adapt the gas flow of the igniter screw 5 to different propellant charges 4. It is also possible to adapt the gas flow by the choice of spring constant. For example, a spring constant can be selected so that the gas flow increases linearly with increasing gas pressure.
    By varying the degree of ascent in the axial direction, it is also possible to influence the gas distribution in the axial direction.
    Figure 5 shows an alternative embodiment of the tension spring according to Figure 2, wherein the winding turns 10 are formed with a square cross-section 13, which provides a more effective sealing gasket of the spring and a more effective seal against surrounding propellant charge 4 when the spring is closed. Figure 5 also shows a special embodiment with radially arranged gas channels 11 in the contact surfaces 12 between the winding turns 10, which gas channels 11 enable a gas flow from the tension spring even when the spring is closed. The ammunition unit 1 according to figure 1 is provided with a holder 16 which is intended to keep the tension spring centered in the cartridge case 2. The holder 16 is, preferably, designed as a cylinder arranged in the front part of the cartridge case 2 in connection with the rear plane of the grenade 2. 534 'H58 _8_ The function of the holder 16 is to prevent the tension spring from coming out of position when the ammunition unit 1 is subjected to mechanical action, such as, for example, vibrations during transport in a combat vehicle. The tension spring is arranged centrally and axially in the grenade sleeve 2, the rear end of the tension spring being fixedly mounted in the combustion chamber 6 of the igniter screw 5 and the front end of the igniter screw 5 comprising the sealing plug 15 is movably arranged in the cylinder 16 so that the tension spring can move freely, back and forth in the cylinder 16, much like the movement of a piston in a cylinder. With said arrangement it is ensured that the spring is always centered in the cartridge sleeve 2. Furthermore, uncontrolled oscillations of the tension spring during the firing process are prevented.
    The invention is not limited to the embodiments shown but can be varied in various ways within the scope of the claims. It is further understood that the number, size, material and shape of the elements included in the spark plug and the details which are important for the invention, for example tension spring, combustion chamber, sealing plug, adapter and holder can be adapted with respect to each other and with regard to other components. elements and details of an ammunition unit.
    权利要求:
    Claims (1)
    [1]
    A ignition screw (5) ammunition unit (1) intended to be included in one comprising a grenade (3) and a cartridge case (2) for igniting a propellant charge (4) arranged in the cartridge case (2), which spark plug (5) combustion chamber (6) comprising a pyrotechnic charge (8), and an expansion chamber (7) arranged gas outlet (9), comprising a radially extending chamber which can withstand large mechanical stresses, characterized in that the expansion chamber (7) is (7) is designed to be designed as a helical type tension spring where the gaps between the winding turns of the tension spring constitute the gas outlet (9) of the ignition screw (5) to the surrounding propellant charge (4). An ignition screw (5) of the tension spring characterized by one sea L is designed so that the gas outlet (9) of the tension spring, initially, is closed so that it gradually opens in the event of rising gas pressure. An ignition screw (5) claim 1 characterized by mi according to or 2, the winding turns (10) of the tension spring (10) are formed with square for effective sealing against surrounding propellant charge (4) when the gas outlet (9) is closed An ignition screw (5) according to any of the preceding claim, characterized in that the tension spring also comprises gas channels (11) arranged radially in the contact surfaces (12) between the winding turns (10). An ignition screw (5) according to any preceding characteristic of the axle end is a requirement, the front being provided with a sealing part (15) for sealing against the surrounding propellant charge (4). The rear end of the tension spring is characterized in that the rear end of the tension spring is formed with a press socket for mounting the tension spring directly in the combustion chamber (6) according to claim 1, 10. 534 168 _10-. An ignition screw (5) of the pressure socket of the tension spring, which is characteristic of each sea ß, is conically shaped. Ultemmshmv ß) characterized in that the rear end of the tension spring is mounted to (14), (14) is mounted according to claim 6, the combustion chamber (6) via an adapter, one end of the adapter to the tension spring via a press socket and the other end of the adapter (14) is mounted to the combustion chamber (6) via a threaded connection. An ignition screw (5) according to any one of the preceding claims, characterized in that the tension spring has a spring constant which is selected so that the gas outlet (9) between the winding turns (10) when pressurized increases linearly with increasing gas pressure. An ammunition unit (1) comprising an ignition screw (5) according to any one of claims 1-9, characterized in that the ammunition unit (1) also comprises a holder (16) in the form of a cylinder fixedly arranged in the front part of the cartridge case (2) in connection to the rear part of the grenade (1), the front part of the tension spring being movably arranged in the cylinder so that the tension spring can move freely backwards in pressurization of the tension spring. forward and the cartridge case (2) at
    类似技术:
    公开号 | 公开日 | 专利标题
    US20050268808A1|2005-12-08|Cartridge
    WO2013082557A1|2013-06-06|Polymer projectile having an integrated driving band
    MX2011004500A|2011-07-19|Wad with ignition chamber.
    US20200166315A1|2020-05-28|Ammunition Cartridge
    RU2368865C1|2009-09-27|Illumination or signal round for grenade launcher
    RU2492408C1|2013-09-10|Traumatic cartridge for tubeless weapon
    RU2320951C2|2008-03-27|Round for medium-and large-caliber guns
    EP3341676B1|2019-05-22|Cartridge ammunition
    SE534168C2|2011-05-17|Flexible ignition screw
    RU2631958C1|2017-09-29|Reactive engine, method for shooting with rocket ammunition and rocket ammunition
    US9121679B1|2015-09-01|Limited range projectile
    RU2462686C2|2012-09-27|Method of increase of range capability of projectile | and device for its implementation
    RU2327946C2|2008-06-27|Two-module propellant charge
    RU2647715C1|2018-03-19|Method of increasing the distance plane of a charger and the device for its implementation |
    RU2748027C2|2021-05-19|Jet ammunition engine
    RU2512815C1|2014-04-10|Cartridge for smooth-bore guns
    US9360223B1|2016-06-07|High velocity ignition system for ammunition
    US9291410B2|2016-03-22|Cooling device for cooling combustion gases from recoilless anti-tank weapons
    RU2560230C2|2015-08-20|Strengthened cartridge /versions/ and method of its fabrication
    RU2503909C1|2014-01-10|Recoilless rifle
    RU2717569C1|2020-03-24|Projectile charge for separate loading shot
    US537882A|1895-04-23|Edmund l
    RU2357199C2|2009-05-27|Aircraft artillery shell with heat expansion compensation device for gun barrel
    RU2363912C1|2009-08-10|Artillery piece charge
    US10712134B2|2020-07-14|Rocket propelled bullet assembly
    同族专利:
    公开号 | 公开日
    SE1000178A1|2011-05-17|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1000178A|SE1000178A1|2010-02-25|2010-02-25|Flexible ignition screw|SE1000178A| SE1000178A1|2010-02-25|2010-02-25|Flexible ignition screw|
    [返回顶部]