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EP3048411A1 - Actionneur - Google Patents

Actionneur Download PDF

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Publication number
EP3048411A1
EP3048411A1 EP15152083.0A EP15152083A EP3048411A1 EP 3048411 A1 EP3048411 A1 EP 3048411A1 EP 15152083 A EP15152083 A EP 15152083A EP 3048411 A1 EP3048411 A1 EP 3048411A1
Authority
EP
European Patent Office
Prior art keywords
housing body
working space
pyrotechnic actuator
drive
actuator according
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.)
Withdrawn
Application number
EP15152083.0A
Other languages
German (de)
English (en)
Inventor
Alexander Kern
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Metalsa Automotive GmbH
Original Assignee
Metalsa Automotive GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Metalsa Automotive GmbH filed Critical Metalsa Automotive GmbH
Priority to EP15152083.0A priority Critical patent/EP3048411A1/fr
Publication of EP3048411A1 publication Critical patent/EP3048411A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/006—Explosive bolts; Explosive actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/19—Pyrotechnical actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/06—Use of special fluids, e.g. liquid metal; Special adaptations of fluid-pressure systems, or control of elements therefor, to the use of such fluids

Definitions

  • Pyrotechnic actuators of the type mentioned above are particularly preferably used in conjunction with, for example. Vehicle safety systems to activate the safety systems within fractions of a second.
  • the pyrotechnic actuators thus allow, for example, a sudden adjustment of protective elements or the installation of an airbag, so that in case of danger - which can be detected by suitable sensor systems - an optimal protective effect is given.
  • the invention has for its object to provide a pyrotechnic actuator, which has a small size and high volume-specific power density and is reusable and thus allows repeatable reversibility of security systems.
  • the invention solves the problem by a pyrotechnic actuator with the features of claim 1.
  • Advantageous developments of the invention are specified in the dependent claims.
  • Characteristic of the pyrotechnic actuator according to the invention is that the working space is filled in the region of two spaced apart in the working space projecting electrodes with an acid and hydrogen-containing liquid and that in the working chamber further protrudes an ignition device for igniting an oxygen-hydrogen gas mixture suitable is.
  • the inventive arrangement of the acid and hydrogen-containing liquid in the region of the electrodes, so that they are in contact with the liquid, makes it possible to generate a flammable oxygen-hydrogen gas mixture via a voltage supply to the electrodes by electrolysis.
  • the gas mixture collects above the liquid, wherein the volume of the working space can be increased by a partial displacement of the drive body from the starting position in the direction of the end position, so that the amount of the oxygen-hydrogen gas mixture is variable.
  • the ignition device which is arranged above the liquid and thus within the oxygen-hydrogen gas mixture, makes it possible to ignite this if necessary.
  • the stored in the gas and released by the ignition energy increases the pressure in the working space abruptly, whereby the drive body is moved in fractions of a second to the final position.
  • the movement of the drive body which may be adapted to the safety system, then can be used to transfer the equipped with the pyrotechnic actuator safety systems in their position of use.
  • the internal pressure subsequently drops again after activation and, if appropriate after release of a lock, a return displacement of the drive body can take place. After reaching the initial position can then be started again with the gas generation, so that the actuator makes a further activation of the safety system via a renewed control of the ignition possible.
  • the actuator is thus reversible and can therefore be used several times, because the ignition mixture does not escape, but is reused, thereby changing its state of matter alternately between liquid and gaseous.
  • a voltage source is required to generate the desired gas mixture within the working space. After the generation of the desired gas volume, however, the voltage source is unloaded, since the energy storage remains in the generated gas mixture over a long period of time.
  • the adjustable internal pressure within the working space can be provided by a compression of the gas mixture, a high energy density, which makes it possible to design the actuator according to the invention particularly compact.
  • the generation of the oxygen-hydrogen gas mixture by the electrolysis and the subsequent ignition of the generated gas mixture is completely reversible and requires only very small currents with high energy release. A possibly occurring loss of the oxygen-hydrogen gas mixture due to a possibly occurring diffusion or minimal gas leakage can be compensated in a simple manner via the electrolysis.
  • the drive body can basically be designed in any desired manner. For example, this can also be used to accelerate rotary drives, for example, swing vanes or paddle wheels. According to a particularly advantageous embodiment of the invention, however, it is provided that the drive body is formed by a linearly displaceably mounted on the housing drive piston.
  • the use of a drive piston makes it possible to produce a particularly compact actuator.
  • the drive piston delimits with a portion of the working space together with a portion of the housing body. Activation of the oxygen-hydrogen gas mixture via the ignition device causes a linear displacement of the drive piston to its intended end position, so that this movement can be used to control any safety systems.
  • the leadership of the drive body on the housing body allows it to dispense with additional guide elements. The development of the invention thus has a particularly high reliability.
  • the drive piston in Direction is biased to the starting position.
  • a pressure acting on the drive piston is produced which is opposite to the pressure which is generated by the compressed gas mixture within the working space.
  • the spring bias causes a stable position of the drive piston, so that movement noise can be reliably avoided.
  • the configuration of the bias voltage is basically freely selectable, wherein it is particularly preferred that the drive piston is biased by a helical compression spring.
  • a helical compression spring is particularly preferably arranged coaxially to an advantageously cylindrically designed drive piston and thus enables a particularly compact design of the actuator.
  • the drive piston interacts with a switching unit which interrupts a voltage supply of the electrodes in an operating position arranged between the starting position and the end position.
  • the position of the drive piston which occupies this in the region between the end position and initial position and is displaced from the starting the piston upon activation in the end position.
  • the drive piston engages in the operating position with a switching element of the switching unit engages and interrupts the power supply of the voltage source to the electrodes.
  • a switching element of the switching unit engages and interrupts the power supply of the voltage source to the electrodes.
  • the configuration of the ignition device for igniting the oxygen-hydrogen gas mixture can in principle be carried out in any desired manner.
  • the ignition device is formed by a filament.
  • the filament is arranged above the acid and hydrogen-containing liquid and can be connected via a switch with a power supply, which leads in the switched state that the filament heats up and ignites the oxygen-hydrogen gas mixture.
  • the actuator can be activated in a simple manner via the switch, wherein the switch can, for example, be coupled to a sensor unit which recognizes a need to activate the safety system.
  • the ignition device in particular the filament is switchably connected to the power supply of the electrodes.
  • the filament is switchably connected to the power supply of the electrodes.
  • this embodiment of the invention can then be dispensed with a separate voltage source, so that a particularly simple and compact construction of the actuator is achieved.
  • the actuator can also be connected to the power supply of the vehicle, which is equipped with the corresponding safety system.
  • the housing body and / or the drive body are coated in the region of the working space.
  • a coating for example a lacquer layer or a plastic covering applied to the surface, protects the components against corrosion due to contact with the oxygen- and hydrogen-containing liquid.
  • the coating can also have sliding properties which ensure a good displacement of the drive body relative to the housing body.
  • the drive piston in Direction in particular the drive piston in Direction to the end position basically any configurations can be provided.
  • the housing body has an end stop, with which the drive body cooperates in the end position.
  • the housing body with an end stop can be dispensed with separate devices for limiting the movement of the drive body.
  • the actuator can thus be produced in a particularly simple and cost-effective manner.
  • FIG. 1 an embodiment of an actuator 1 is sketched in a sectional view.
  • the actuator 1 has a housing body 2 and a drive piston 3 displaceably mounted within the housing body 2.
  • the housing body 2 in this case has a cylindrical side wall 16 and is closed at one end by a housing body bottom 15, the housing body bottom 1 having two spaced-apart, the housing body bottom 15 penetrating electrodes 5a, 5b.
  • the housing body bottom 15, the side wall 16 of the housing body 2 and the housing body bottom 15 facing surface of the drive piston 3 define a working space 4 liquid and gas-tight from the environment.
  • the drive piston 3 is displaceably mounted on a coating 11 arranged on the inside of the side walls 16, wherein the coating 11 also serves, in addition to good sliding properties, as corrosion protection, which prevents a liquid 6 arranged in the working space 4 from corroding the housing body 2 leads.
  • the arranged in the working space 4 liquid 6 is oxygen and hydrogen-containing, so that a voltage supply to the electrodes 5a, 5b via the power supply 10 leads to an electrolysis, resulting in above the liquid 6, an oxygen-hydrogen gas mixture.
  • This gas mixture can be ignited via an ignition device designed as a filament 7, if necessary, for which purpose a switch 14 is provided which the Filament 7 connects to the power supply 10.
  • An ignition of the gas mixture causes a sudden pressure increase within the working space 4, as a result of the drive piston 3 is displaced from an operating position, not shown here to an end position also not shown here, which is defined by an end stop 12 of the housing body 3.
  • a stop surface 13 is not directly at the end stop 12, but is spaced by a then compressed helical compression spring 8 of the end stop 12, wherein the helical compression spring 8 biases the drive piston 3 in the direction of its operating position or starting position via its spring characteristic compressed the gas mixture.
  • the power supply 10 can be provided by an on-board vehicle electrical system to which the actuator 1 or the safety system having the actuator 1 is connected. After the connection of the actuator 1 to the power supply 10 takes place via the electrodes 5a, 5b gas generation as a result of the drive piston 3 is shifted from a starting position, not shown here to an operating position, starting from the drive piston after activation of the switch 14 by ignition the gas mixture in the end position is adjustable.
  • the operating position is determined by a switch unit 9, which interrupts the power supply to the electrodes 5a, 5b in cooperation with the drive piston 3.
  • the drive piston 3 drops, the latter is disengaged from the switch unit 9, so that the voltage supply 10 to the electrodes 5a, 5b is restored and the gas pressure within the working space 4 is increased until the drive piston 3 interacts again with the switching unit 9.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Actuator (AREA)
EP15152083.0A 2015-01-22 2015-01-22 Actionneur Withdrawn EP3048411A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15152083.0A EP3048411A1 (fr) 2015-01-22 2015-01-22 Actionneur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15152083.0A EP3048411A1 (fr) 2015-01-22 2015-01-22 Actionneur

Publications (1)

Publication Number Publication Date
EP3048411A1 true EP3048411A1 (fr) 2016-07-27

Family

ID=52469587

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15152083.0A Withdrawn EP3048411A1 (fr) 2015-01-22 2015-01-22 Actionneur

Country Status (1)

Country Link
EP (1) EP3048411A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3354634A (en) * 1965-10-14 1967-11-28 Atlas Chem Ind Retractable piston actuator
US3539746A (en) * 1967-05-31 1970-11-10 Ericsson Telefon Ab L M Relay switch with diaphragm operated by explosive gas mixture
CH530085A (de) * 1971-01-15 1972-10-31 Fritz Dr Kesselring Impulsantriebsanordnung, insbesondere für einen elektrischen Schalter
US4332219A (en) * 1980-11-18 1982-06-01 Ernesto Gonzalez Electrocombustion engine
US4860698A (en) * 1988-05-11 1989-08-29 Networks Electronic Corp. Pyrotechnic piston device
US20120067325A1 (en) * 2009-05-26 2012-03-22 Patrick Wathieu Method for operating an internal combustion engine and internal combustion engine in accordance with said method
DE102013008149A1 (de) * 2013-05-14 2014-12-04 Trw Airbag Systems Gmbh PYROTECHNlSCHE ANTRlEBSElNHElT UND HERSTELLUNGSVERFAHREN

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3354634A (en) * 1965-10-14 1967-11-28 Atlas Chem Ind Retractable piston actuator
US3539746A (en) * 1967-05-31 1970-11-10 Ericsson Telefon Ab L M Relay switch with diaphragm operated by explosive gas mixture
CH530085A (de) * 1971-01-15 1972-10-31 Fritz Dr Kesselring Impulsantriebsanordnung, insbesondere für einen elektrischen Schalter
US4332219A (en) * 1980-11-18 1982-06-01 Ernesto Gonzalez Electrocombustion engine
US4860698A (en) * 1988-05-11 1989-08-29 Networks Electronic Corp. Pyrotechnic piston device
US20120067325A1 (en) * 2009-05-26 2012-03-22 Patrick Wathieu Method for operating an internal combustion engine and internal combustion engine in accordance with said method
DE102013008149A1 (de) * 2013-05-14 2014-12-04 Trw Airbag Systems Gmbh PYROTECHNlSCHE ANTRlEBSElNHElT UND HERSTELLUNGSVERFAHREN

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