US20120011847A1 - Triggered-stroke actuator for a safety device incorporated into a motor vehicle to protect a pedestrian in the event of a frontal impact - Google Patents

Triggered-stroke actuator for a safety device incorporated into a motor vehicle to protect a pedestrian in the event of a frontal impact Download PDF

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Publication number
US20120011847A1
US20120011847A1 US13/130,333 US200913130333A US2012011847A1 US 20120011847 A1 US20120011847 A1 US 20120011847A1 US 200913130333 A US200913130333 A US 200913130333A US 2012011847 A1 US2012011847 A1 US 2012011847A1
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US
United States
Prior art keywords
piston
triggered
rod
stroke actuator
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.)
Abandoned
Application number
US13/130,333
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English (en)
Inventor
Evrard Borg
Eric Laspesa
Jean-Paul Nadeau
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.)
Safran Ceramics SA
Original Assignee
SME SA
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 SME SA filed Critical SME SA
Assigned to SME reassignment SME ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BORG, EVRARD, LASPESA, ERIC, NADEAU, JEAN-PAUL
Publication of US20120011847A1 publication Critical patent/US20120011847A1/en
Assigned to HERAKLES reassignment HERAKLES CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SME
Abandoned legal-status Critical Current

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/18—Anchoring devices
    • B60R22/195—Anchoring devices with means to tension the belt in an emergency, e.g. means of the through-anchor or splitted reel type
    • B60R22/1954—Anchoring devices with means to tension the belt in an emergency, e.g. means of the through-anchor or splitted reel type characterised by fluid actuators, e.g. pyrotechnic gas generators
    • B60R22/1955—Linear actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N11/00—Arrangements for supplying grease from a stationary reservoir or the equivalent in or on the machine or member to be lubricated; Grease cups
    • F16N11/10—Arrangements for supplying grease from a stationary reservoir or the equivalent in or on the machine or member to be lubricated; Grease cups by pressure of another fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/34—Protecting non-occupants of a vehicle, e.g. pedestrians
    • B60R21/38—Protecting non-occupants of a vehicle, e.g. pedestrians using means for lifting bonnets

Definitions

  • a safety system if such a safety system is actuated in time by appropriate detector means, it serves to raise the hood through a few tens of millimeters in a few tens of milliseconds (where 80 mm and 30 ms are representative values), i.e. very quickly after an imminent impact has been detected.
  • the drive member of such a system advantageously comprises a triggered-stroke actuator of the type comprising a pyrotechnic charge that is fired electrically. The gas generated by the combustion of the charge pushes the piston of the actuator, which piston is associated with a rod that actuates the mechanism for raising the hood, or even directly actuates the hood itself.
  • the return damping system is advantageously combined with the actuator that raised the hood.
  • the assembly constituted by the hood, the raising mechanism, and the piston of the actuator retracts under the impact (after the hood has been raised and deformed) while being braked, and then blocked.
  • the damper device is arranged in the body. It makes use of means that are mechanical.
  • the invention serves firstly to provide this damped return function of the hood by using means that are simpler.
  • the slow combustion pyrotechnic charge may be housed in said gas generator including the fast combustion pyrotechnic charge, i.e., for example, in a plastics housing having a filamentary duct enabling said pyrotechnic charges to be initiated under control.
  • said fast and slow combustion pyrotechnic charges are housed separately in the actuator, in communication with the expansion chamber. This variant serves to separate the functions of the charges and makes it possible to modify each of their functions independently, depending on the requirements of each application.
  • the safety system is actuated and consequently that the hood is raised without an accident occurring, for example as a result of an erroneous detection. It may also happen that the pedestrian does not strike the hood. Under such circumstances, it is desirable for the hood to be capable of returning to its initial position, after a certain length of time has elapsed since triggering.
  • the invention also makes such repositioning of the hood possible, automatically, e.g. under the effect of its own weight.
  • a calibrated leakage passage is formed through the piston, and possibly through the rod, in order to exhaust the gas that has driven the piston.
  • the piston and the rod are rigidly secured to each other and the leakage passage opens out through the surface of the rod into an annular space defined between the rod and the inside wall of the body.
  • the outlet from the leakage passage is in communication with the outside only once the actuator has been triggered. Throughout the period during which the actuator is not triggered, there is no fear of corrosion occurring, and the pyrotechnic charges are protected from the outside medium.
  • the metal elements inside the actuator may be made of metals that are inexpensive without requiring any special anti-corrosion treatment.
  • FIG. 2 is a graph showing the force developed by the actuator as a function of time starting from triggering.
  • FIG. 1 shows a triggered-stroke actuator 11 having a generally cylindrical body 13 housing a piston 15 associated with a rod 17 that projects axially from one end 18 of the body.
  • the body 13 also houses a gas generator 19 , advantageously an electrically controlled filamentary duct gas microgenerator that is mounted in the body facing the piston, at a predetermined distance therefrom.
  • the gas generator 19 is held stationary at the other end 21 of the body by a setback 22 therein and by a rear abutment 23 .
  • An annular gasket 25 is placed between the gas generator 19 and the inside wall of the body.
  • a breakable or disconnectable connection element 27 is interposed between the generator and the piston. It thus holds the piston 15 at a predetermined distance from the gas generator to stabilize the position of the piston 15 and the rod 17 prior to actuation and to define the initial volume of an expansion chamber 30 between the gas generator and the facing face of said piston.
  • the gas generator 19 comprises a fast combustion pyrotechnic charge.
  • the gas ejected into the expansion chamber 30 causes the connection element 27 to break or disconnect and propels the piston-and-rod assembly so that said rod projects rapidly and axially from the end of the body. This movement serves to trigger a mechanism for raising the hood (not shown). In simple and advantageous manner, the rod may even be hinged directly to the hood.
  • a setback 35 that forms a longitudinal annular space 36 between the rod and the inside wall of the body.
  • a sealing gasket 37 is carried by the rod in the vicinity of its end that projects outwards. This gasket extends between the rod 17 and the inside wall of the body in the vicinity of its corresponding end 18 .
  • the annular space 36 is isolated from the outside medium.
  • the annular space is also isolated from the expansion chamber by means of an O-ring 39 located between said piston 15 and said body 13 .
  • the actuator 11 also includes a pyrotechnic charge 38 of combustion that is slower than that of said gas generator.
  • This second charge in the form of a compacted powder pellet, is housed in a location that communicates with the expansion chamber 30 so as to be fired by the combustion of the fast combustion pyrotechnic charge.
  • the slow combustion pyrotechnic charge is placed in a cavity 40 of the piston that opens out into the expansion chamber.
  • the charge 38 is held in place by a cover that is pierced in its center and that is engaged in the orifice of the cavity 40 .
  • the cavity opens out in the expansion chamber 30 axially facing the gas generator.
  • FIG. 2 shows the result of the combination of the successive combustions of the two charges.
  • the force communicated axially to the piston by the expansion of the gas is plotted up the ordinate axis and time is plotted along the abscissa axis.
  • A a very high level of thrust is communicated by the fast combustion charge for a brief period (A).
  • This thrust exceeds 1000 newtons (N) but falls off very quickly to 500 N approximately in a duration of a few tens of milliseconds, typically 30 ms. This corresponds to the movement of the piston and thus to triggering the safety system for raising the hood. This rapid fall does not provide sufficient return damping.
  • the slow combustion pyrotechnic charge 38 is also fired, thereby enabling a certain level of force to be imparted, which level decreases much more slowly, as shown. It is estimated that the force developed is generally sufficient and that it must decrease sufficiently slowly, over as long as several tenths of a second (B), in order to obtain the looked-for damping, with the force opposed by the piston varying over a range of a few hundreds of newtons (C).
  • a calibrated leakage passage 45 is formed in the piston and (optionally) in the rod in order to exhaust the combustion gas.
  • This calibrated leakage passage 45 is small enough to have no significant effect during the stage in which the expansion chamber 30 is pressurized as a result of the combustion of the two pyrotechnic charges.
  • the dimension of the passage is adjusted to make it possible subsequently for the combustion gas contained in the expansion chamber 30 to leak away at a rate that is sufficient to ensure that the return force decreases over the specified range (D) and thus that the hood returns to its position with little force, possibly under the effect of its own weight.
  • the leakage passage 45 opens out through the surface of the rod into the above-described annular space 36 . It communicates with the cavity 40 of the piston that houses the slow combustion pyrotechnic charge 38 .
  • a filter 47 is arranged in the piston between the cavity 40 and the calibrated leakage passage 45 . This filter serves to avoid particles that result from the combustion, clogging the calibrated leakage passage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Actuator (AREA)
  • Superstructure Of Vehicle (AREA)
  • Automotive Seat Belt Assembly (AREA)
US13/130,333 2008-11-26 2009-11-24 Triggered-stroke actuator for a safety device incorporated into a motor vehicle to protect a pedestrian in the event of a frontal impact Abandoned US20120011847A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0858026 2008-11-26
FR0858026A FR2938884B1 (fr) 2008-11-26 2008-11-26 Verin a course declenchee pour dispositif de securite integre a un vehicule automobile, pour la protection d'un pieton en cas de choc frontal
PCT/FR2009/052270 WO2010061117A1 (fr) 2008-11-26 2009-11-24 Verin a course declenchee pour dispositif de securite integre a un vehicule automobile, pour la protection d'un pieton en cas de choc frontal

Publications (1)

Publication Number Publication Date
US20120011847A1 true US20120011847A1 (en) 2012-01-19

Family

ID=40823289

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/130,333 Abandoned US20120011847A1 (en) 2008-11-26 2009-11-24 Triggered-stroke actuator for a safety device incorporated into a motor vehicle to protect a pedestrian in the event of a frontal impact

Country Status (11)

Country Link
US (1) US20120011847A1 (fr)
EP (1) EP2356341B1 (fr)
JP (1) JP5656858B2 (fr)
KR (1) KR20110100234A (fr)
CN (1) CN102245909B (fr)
BR (1) BRPI0920992A2 (fr)
CA (1) CA2744543A1 (fr)
FR (1) FR2938884B1 (fr)
MX (1) MX2011005326A (fr)
RU (1) RU2521186C2 (fr)
WO (1) WO2010061117A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090217814A1 (en) * 2008-02-28 2009-09-03 Gm Global Technology Operations, Inc. Pneumatic actuator
US20120160947A1 (en) * 2010-12-22 2012-06-28 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Pretensioner
US20130139508A1 (en) * 2010-06-15 2013-06-06 Herakles Triggered-stroke actuator provided with a gas discharge device
US9206089B2 (en) 2012-07-13 2015-12-08 Takata Corporation Gas pressure actuator and method of assembling the same
AT516050B1 (de) * 2014-08-19 2016-02-15 Hirtenberger Automotive Safety Pyrotechnischer Aktuator
CZ306186B6 (cs) * 2015-02-19 2016-09-14 Indet Safety Systems A.S. Pyrotechnický aktivátor se společnou iniciací časově posunutých dějů

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011014127A1 (de) * 2011-03-15 2012-09-20 Trw Automotive Gmbh Linearantrieb
CZ2011594A3 (cs) * 2011-09-24 2013-05-29 Indet Safety Systems A. S. Posuvný semireverzibilní pyrotechnický aktivátor bezpecnostních systému automobilu, zejména pro ochranu chodcu
WO2013055264A1 (fr) * 2011-10-11 2013-04-18 Autoliv Development Ab Agencement de levage de capot
EP2795138B1 (fr) * 2011-12-21 2017-08-23 Autoliv Development AB Dispositif de soulèvement de capot
FR2993326B1 (fr) * 2012-07-13 2014-08-01 Herakles Verin a course declenchee a retour arriere amorti
DE202012012378U1 (de) * 2012-12-21 2013-01-18 Key Safety Systems Inc. Antriebsvorrichtung zum Anheben einer für Fußgängerschutz ausgebildeten Motorhaube eines Fahrzeugs
WO2018045323A1 (fr) * 2016-09-01 2018-03-08 Tk Holdings Inc. Actionneur linéaire à évent
CN110466471A (zh) * 2019-08-22 2019-11-19 陕西庆华汽车安全***有限公司 一种汽车引擎盖顶起装置及其顶起方法
AT526223B1 (de) * 2022-06-28 2024-02-15 Astotec Automotive Gmbh Pyrotechnischer Aktuator

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US7634912B2 (en) * 2006-05-25 2009-12-22 Raytheon Company Methods and apparatus for actuator system

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US3107616A (en) * 1961-03-14 1963-10-22 Charles W Boaz Sliding door opening mechanism
US4412420A (en) * 1980-07-03 1983-11-01 Networks Electronics Corp. Explosive actuated pin puller
RU2084710C1 (ru) * 1992-01-29 1997-07-20 Машиностроительное конструкторское бюро "Радуга" Пиропривод
DE29717367U1 (de) * 1997-09-29 1998-02-12 Trw Occupant Restraint Systems Gmbh, 73551 Alfdorf Pyrotechnischer Antrieb, insbesondere für Fahrzeuginsassen-Rückhaltesysteme
DE59901999D1 (de) * 1999-09-28 2002-08-14 Ford Global Tech Inc Hubkolben-Zylinder Einheit einer Sicherheitseinrichtung zum Schutz von Fussgängern
DE19961019C1 (de) * 1999-12-17 2001-02-22 Grammer Ag Antriebseinrichtung für eine Fahrzeugkomponente
FR2878212B1 (fr) * 2004-11-22 2008-08-29 Pyroalliance Sa Systemes d'absorption mecaniques pour articulation active de capot
RU2291820C1 (ru) * 2005-07-21 2007-01-20 Федеральное государственное унитарное предприятие "Научно-производственное объединение им. С.А. Лавочкина" Толкатель для отделения створок сбрасываемого головного обтекателя от ракетной ступени
JP4979401B2 (ja) * 2006-04-13 2012-07-18 株式会社ダイセル アクチュエータ
AT9402U1 (de) * 2006-04-28 2007-09-15 Magna Steyr Fahrzeugtechnik Ag Pyrotechnischer aktuator
FR2910941B1 (fr) * 2007-01-03 2009-10-02 Snpe Materiaux Energetiques Sa Actionneur pyrotechnique et son procede de fabrication.

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US7634912B2 (en) * 2006-05-25 2009-12-22 Raytheon Company Methods and apparatus for actuator system

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090217814A1 (en) * 2008-02-28 2009-09-03 Gm Global Technology Operations, Inc. Pneumatic actuator
US8316758B2 (en) 2008-02-28 2012-11-27 GM Global Technology Operations LLC Pneumatic actuator
US8739682B2 (en) 2008-02-28 2014-06-03 GM Global Technology Operations LLC Pneumatic actuator
US20130139508A1 (en) * 2010-06-15 2013-06-06 Herakles Triggered-stroke actuator provided with a gas discharge device
US9470250B2 (en) * 2010-06-15 2016-10-18 Herakles Triggered-stroke actuator fitted with a gas evacuation device
US20120160947A1 (en) * 2010-12-22 2012-06-28 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Pretensioner
US9260077B2 (en) * 2010-12-22 2016-02-16 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Pretensioner
US9206089B2 (en) 2012-07-13 2015-12-08 Takata Corporation Gas pressure actuator and method of assembling the same
AT516050B1 (de) * 2014-08-19 2016-02-15 Hirtenberger Automotive Safety Pyrotechnischer Aktuator
AT516050A4 (de) * 2014-08-19 2016-02-15 Hirtenberger Automotive Safety Pyrotechnischer Aktuator
CZ306186B6 (cs) * 2015-02-19 2016-09-14 Indet Safety Systems A.S. Pyrotechnický aktivátor se společnou iniciací časově posunutých dějů

Also Published As

Publication number Publication date
WO2010061117A1 (fr) 2010-06-03
BRPI0920992A2 (pt) 2016-01-05
RU2011124291A (ru) 2013-01-10
FR2938884A1 (fr) 2010-05-28
EP2356341B1 (fr) 2016-04-20
EP2356341A1 (fr) 2011-08-17
CN102245909A (zh) 2011-11-16
JP2012509813A (ja) 2012-04-26
KR20110100234A (ko) 2011-09-09
MX2011005326A (es) 2011-11-18
RU2521186C2 (ru) 2014-06-27
CN102245909B (zh) 2015-03-25
JP5656858B2 (ja) 2015-01-21
FR2938884B1 (fr) 2013-02-08
CA2744543A1 (fr) 2010-06-03

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Owner name: SME, FRANCE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BORG, EVRARD;LASPESA, ERIC;NADEAU, JEAN-PAUL;REEL/FRAME:027022/0411

Effective date: 20110824

AS Assignment

Owner name: HERAKLES, FRANCE

Free format text: CHANGE OF NAME;ASSIGNOR:SME;REEL/FRAME:030217/0993

Effective date: 20120525

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION