• 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:
    The invention relates to a pyrotechnic actuator for hiring a bonnet of a vehicle, with a piston (2), which can be acted upon by a pyrotechnic propellant charge and displaceable in a cylinder (17), which protrudes with a free end out of the cylinder. The piston (2) has at its free end an end-side outflow opening (14) which is connected via an outflow channel (6) with the inside of the piston (2). In the interior of the piston (2) is arranged in the initial position before the ignition of the actuator, a second propellant charge (3) in front of the outflow channel (8), whereby this is sealed by the second propellant charge (3). The outflow channel (6) has a diameter, which increases relative to the free end face (15) of the piston (2), preferably in a stepped manner, in which a sealing plug (4) is inserted.
    公开号:AT516050A4
    申请号:T50574/2014
    申请日:2014-08-19
    公开日:2016-02-15
    发明作者:
    申请人:Hirtenberger Automotive Safety；
    IPC主号:
    专利说明:

    The invention relates to a pyrotechnic actuator for hiring a hood of a vehicle, with one of a pyrotechnic propellant charge acted upon in a cylinder movable piston, which protrudes with a free end of the cylinder.
    The safety requirements for motor vehicles are constantly evolving and the number of passive safety systems and their functionality is also increasing. In the field of pedestrian protection, active hinges are now standard, which in the event of a collision-driven by pyrotechnic actuators- raise the hood in the hinge area, and thus create a deformation space between the engine hood and the components in the engine compartment.
    When a pedestrian collides with the bonnet, it gives way and thus ensures a defined reduction of the impact energy, whereby the severity of the injury is significantly reduced. If there is a need to make the bonnet in the front area, active locks or active striker systems are available for this, which are also powered by pyrotechnics. For the hiring of the hood in the required time span are now a variety of solutions available.
    However, the hiring is only a part of the protection function, it is equally important that after setting an adjustable and constant as possible retention force is provided, and this ideally falls after a predetermined time to a very low value, to a slight reversing of the protection system to allow to the starting position. These points have so far been insufficiently solved. With regard to reversing, the following systems are known:
    According to AT 009 827, the actuator is depressurized at the end of the ejection movement and the energy absorption takes place via a mechanical damping. This variant is mechanically very complex, and for reversing the force of mechanical damping must be overcome.
    Furthermore, actuators are known which vent permanently after ignition through a diaphragm. Here, the provision is very easy, but the power curve drops very quickly.
    A recent development are systems which are initially largely dense when starting, and only after pressing back into a venting position drain the gas pressure. Again, the gas pressure in the actuator decreases by the cooling of the gases over time, for reversing but still not inconsiderable residual gas pressure must be overcome.
    The aim of the invention is to avoid the disadvantages of the known solutions described above and to propose an actuator of the type mentioned, in which after triggering and a corresponding action on the piston by a pyrotechnic propellant controlled degradation of the pressure in the actuator in a simple manner is.
    According to the invention this is achieved in that the piston has at its free end an end-side outflow opening, which is connected via an outflow channel with the inside of the piston, and that arranged in the interior of the piston in the initial position before the ignition of the actuator, a second propellant charge before the outflow is, whereby it is sealed by the propellant charge.
    The proposed measures a seal of the discharge channel is given by the second propellant charge, so that upon ignition of the first igniter-side pyrotechnic propellant charge, which can be done in a conventional manner electrically, the piston acts like a conventional dense piston and is urged quickly against its extended position, thereby the hood is turned on. At the same time, the second propellant charge is ignited by the ignited pyrotechnic propellant charge, which burns slower and in the first phase of burning over a longer period of time for a constant pressure in the actuator and then, after complete burning, the outflow opens, creating a provision of the actuator and thus a lowering of the hood with little effort is possible. The firing time of the second propellant typically ranges from about 50 to 2000 ms.
    Another feature of the invention is that the propellants contain guanidine and / or guanidine derivatives such as nitroguanidine or guanidine nitrate. These agents can be compressed as granules and the composition of the propellant charges, the burning rates of the two propellant charges can be adjusted.
    In order to protect the gas set from moisture, it is a further feature of the invention that the outflow channel has a seal in the outflow direction after the propellant charge. After burning off the gas kit, the pressure in the actuator ensures removal of the seal.
    According to a possible embodiment, this sealing can take place in that the outflow channel has a diameter which increases in size, preferably in increments, against the free end face of the piston and in which a sealing plug is inserted.
    Additionally or alternatively, it may be a feature of the invention that the outflow channel is sealed at the free end face of the piston by means of a film. This provides a very safe, durable and cost effective protection against moisture penetration to the interior of the piston.
    According to a further feature of the invention, it is provided that the second propellant charge is arranged in an axial bore of the piston, which is open to the interior of the piston. By this measure, on the one hand a secure receptacle for the second propellant charge is created, and on the other hand, the propellant charge is accessible only from one side, whereby they can burn only on the side open to the interior, according to the principle of a forehead burner. The burning rate can thus be influenced not only by the material of the propellant charge, but also by the diameter of the bore and the height of the propellant charge located in the bore.
    In order to ensure a secure hold of the propellant charge in the bore of the piston, it is advantageous that the inner side surfaces of the bore for receiving the second propellant charge at least over part of their depth with structures, e.g. with grooves or a thread, are provided.
    Another feature of the invention is that the second propellant charge is pressed into the bore of the piston. The propellant charge can be very easily positioned by pressing in front of the outflow and seal it accordingly. The material of the propellant can be pressed in easily or even several times to ensure adequate sealing of the discharge channel.
    Finally, it is a feature of the present invention that by burning off the second propellant, the pressure is constant at least in the time window of 35-80 ms after ignition, the maximum deviation from the mean value of the pressure within this time window being 10%. This will ensure that the actuator remains pressurized for the necessary extended period of time.
    The invention will now be described with reference to the accompanying drawings, in which Fig. 1 shows schematically a piston for an actuator according to the invention.
    The piston 2, which is held axially displaceably in a cylinder 17 of an actuator, comprises a piston closure 1 and a tube 16, in which the piston closure 1 is held tight. The piston closure 1 is firmly connected in the example shown with the tube 16 and forms a unit with this. For example, as shown in Fig. 1, this connection may be formed by crimping the piston closure 1 into the tube 16. The igniter-side end of the cylinder 17 with the igniter and a first propellant charge of the actuator is not shown and can be constructed in the usual way.
    The piston closure 1 has a head 9 whose diameter exceeds the outer diameter of the tube 16 and which rests with a shoulder 10 on an end face of the tube 16.
    In a bore 12, which is open towards the inside, of the piston 2 or of the piston closure 1, a second propellant charge 3 is pressed in. The cylindrical wall of this bore 12 is at least over part of its depth, with structures 8, e.g. a thread or circumferential grooves, provided to improve the support of the second propellant charge 3 in the bore 12.
    The second propellant charge 3 seals an outflow channel 6, via which, after complete burning of the second propellant charge 3, combustion gases can flow out of the actuator. The outflow channel 6 has a diameter which increases stepwise in the direction of the free end face 15 of the piston 2. In this case, a sealing plug 4 made of an elastomeric material is held in a portion of the outflow channel 6, which prevents penetration of moisture to the propellant charge 3.
    To seal the piston seal 1 in the tube 16 is a 0-ring 7, provided, which is held in a circumferential groove 13 of the piston seal 1.
    At the free end face 15 of the piston 2, an outlet opening 14 of the Auströmkanals 6 is covered with a film 5.
    If there is an ignition of a propellant charge and thus to a pressurization of the piston 2 in the non-illustrated part of the cylinder of the actuator, the piston 2 is ejected and due to the temperature of the fuel gases of the first propellant ignites the second propellant charge 3 and burns off slowly. As a result, the pressure in the cylinder 17 of the actuator remains largely constant even after the first propellant has burned off. Finally, the second propellant burns down so far that the outflow channel 6 is released and the pressure in the cylinder 17 of the actuator can rapidly degrade. In this case, the Abdichtpfropfen 4 is ejected and the film 5 is broken. The actuator thus meets all the requirements to the tasks in a simple
    Way to solve. In a first phase of the ignition of the piston 2 is quickly ejected by the first propellant charge and leads to a correspondingly fast hiring the hood. In a second phase, the pressure in the piston 2 is kept as constant as possible by the slow burning of the second propellant charge 3 for a prolonged period of time and in a third phase after the combustion of the second propellant charge 3, the pressure in the cylinder 17 is rapidly reduced, whereby the provision of Bonnet by pushing back of the piston 2 in the cylinder 17 is made possible without much effort.
    Vienna, 19.8.2014
    权利要求:
    Claims (9)
    [1]
    Dr. Müllner Dipl.-Ing. Katschinka OG, Patent Attorney Office Weihburggasse 9, Postfach 159, A-1014 WIEN, Austria Phone: [+43 (1) 512 24 81 / Fax: a + 43 (1) 513 76 81 / E-Mail: ® repatent@aon.at Account (PSK): 1480 708 BLZ 60000 BIC: OPSKATWW IBAN: AT19 6000 0000 0148 07081 480 708 16/46235 Hirtenberger Automotive Safety GmbH & Co KG A-2552 Hirtenberg (AT) Claims: 1. A pyrotechnic actuator for hiring a bonnet of a vehicle, comprising a piston (2) displaceable in a cylinder (17) by a pyrotechnic propellant and having a free end from the cylinder protrudes, characterized in that the piston (2) at its free end an end-side outflow opening (14) which is connected via an outflow channel (6) with the inside of the piston (2), and that in the interior of the piston (2) in the initial position before the ignition of the actuator, a second propellant charge (3) in front of the outflow channel (6) is arranged, whereby it is sealed by the propellant charge (3).
    [2]
    2. Pyrotechnic actuator according to claim 1, characterized in that the propellant charges (3) guanidine and / or guanidine derivatives, such as nitroguanidine or guanidine nitrate.
    [3]
    3. Pyrotechnic actuator according to claim 1 or 2, characterized in that the outflow channel (6) in the outflow direction after the propellant charge (3) has a seal.
    [4]
    4. Pyrotechnic actuator according to claim 3, characterized in that the outflow channel (6) has a against the free end face (15) of the piston (2) magnifying, preferably stepwise magnifying diameter, in which a Abdichtpfropfen (4) is inserted.
    [5]
    5. Pyrotechnic actuator according to claim 3 or 4, characterized in that the outflow channel (6) on the free end face (15) of the piston (2) by means of a foil (5) is sealed.
    [6]
    6. Pyrotechnic actuator according to one of claims 1 to 5, characterized in that the second propellant charge (3) in an axial bore (12) of the piston (2) is arranged, which is open to the interior of the piston (2).
    [7]
    A pyrotechnic actuator according to claim 6, characterized in that the inner side surfaces of the bore (12) for receiving the second propellant charge (3) have at least part of their depth with structures (8), e.g. with grooves or a thread, are provided.
    [8]
    8. Pyrotechnic actuator according to claim 6 or 7, characterized in that the second propellant charge (3) in the bore (12) of the piston (2) is pressed.
    [9]
    9. Pyrotechnic actuator according to one of claims 1 to 8, characterized in that by the burning of the second propellant charge (3) the pressure is constant at least in the time window of 35-80 ms after ignition, wherein the maximum deviation from the mean value of the pressure within this window is 10%. Vienna, 19.8.2014
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    同族专利:
    公开号 | 公开日
    AT516050B1|2016-02-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP2048374A1|2007-10-11|2009-04-15|Delphi Technologies, Inc.|Pyrotechnical actuator unit|
    US20120011847A1|2008-11-26|2012-01-19|Sme|Triggered-stroke actuator for a safety device incorporated into a motor vehicle to protect a pedestrian in the event of a frontal impact|CN110873545A|2018-09-02|2020-03-10|孝感定原电子科技有限公司|Initiating explosive actuator|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50574/2014A|AT516050B1|2014-08-19|2014-08-19|Pyrotechnic actuator|ATA50574/2014A| AT516050B1|2014-08-19|2014-08-19|Pyrotechnic actuator|
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