EP2699456A1 - Agencement de soulèvement de capot et procédé pour produire un actionneur - Google Patents

Agencement de soulèvement de capot et procédé pour produire un actionneur

Info

Publication number
EP2699456A1
EP2699456A1 EP11863919.4A EP11863919A EP2699456A1 EP 2699456 A1 EP2699456 A1 EP 2699456A1 EP 11863919 A EP11863919 A EP 11863919A EP 2699456 A1 EP2699456 A1 EP 2699456A1
Authority
EP
European Patent Office
Prior art keywords
piston
actuator
housing
stem
metallic
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Withdrawn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
EP11863919.4A
Other languages
German (de)
English (en)
Other versions
EP2699456A4 (fr
Inventor
Stefan Kuntzsch
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.)
Autoliv Development AB
Original Assignee
Autoliv Development AB
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 Autoliv Development AB filed Critical Autoliv Development AB
Publication of EP2699456A1 publication Critical patent/EP2699456A1/fr
Publication of EP2699456A4 publication Critical patent/EP2699456A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1428—Cylinders
    • 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
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • 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
    • F15B2215/00—Fluid-actuated devices for displacing a member from one position to another
    • F15B2215/30—Constructional details thereof
    • F15B2215/305—Constructional details thereof characterised by the use of special materials

Definitions

  • the invention relates to an actuator for the lifting of a hood or bonnet of a vehicle in a vehicle safety system in order to provide protection for a pedestrian hit by the vehicle .
  • the pedestrian will the bumper of the vehicle often strike the legs or lower torso of the pedestrian.
  • the legs of the pedestrian will normally be pushed in the direction of travel of the vehicle and the head and upper torso will normally be tilted towards the hood and windscreen of the vehicle.
  • This tilting movement often causes the head or upper torso of the pedestrian to first make contact with the hood and thereafter, if the impact force from the hit is strong enough and the vehicle continues forward, also reach the windscreen.
  • the hood will in general provide an efficient, flexible impact energy absorbing structure in the case when a vehicle hit a pedestrian. However, if the hood is not lifted, there is a higher risk that the hood will be deformed to such an extent that hard, non-flexible parts beneath the hood, e.g. an engine block, make contact with the hood and an
  • a less acute angle between the windshield and the hood will also contribute to a less severe condition for a person being hit by a vehicle.
  • the use of an active safety arrangement for lifting the hood contributes significantly to reduce the risk of damages for a person being hit by a vehicle.
  • invention aims in particular to provide an actuator which in a cost efficient way make it possible to produce a hood lifter which functions even after several years of use of the vehicle without the actuator being activated and avoid deterioration of the actuator due to environmental
  • the invention is in particular directed to a piston comprised in a housing forming part of said actuator for lifting of the hood.
  • the piston of the present invention comprises a non- metallic material.
  • the material is for example a plastic polymer such as polyamide (PA) or polybutylene terephthalate (PBT) which may be reinforced by different materials, e.g. by mixing with glass fibres in an amount of 15 - 50 per cent. Another working example could be to use carbon fibres.
  • a metallic core or stem which is covered by a non-metallic material, e.g. a plastic polymer.
  • a plastic polymer e.g.
  • lowering production costs and weight of the actuator is it desired to manufacture the piston without the inclusion of a metallic material.
  • a metallic material for reinforcement of the piston even though there may be alternative non-metallic material such as a rod made of carbon fibres or the like material which also may be used for a reinforcing, load bearing structure.
  • non-metallic materials for the piston will provide an improvement concerning problems with for example oxidation which may lead to corrosion of the piston.
  • the actuator may be constructed in a less complicated way than ordinary actuators provided with metallic pistons which demand a more efficient sealing and/or specific surface treatments of the piston in order to avoid oxidation or corrosion of the piston.
  • the piston may be made from only non- metallic material or may be a combination of metallic and non-metallic material. Even if a metallic material is included in the piston, the piston comprises preferably at least 50 percent by volume of non-metallic materials, e.g when a metallic structure is used as a reinforcing, central rod.
  • a suitable non-metallic material for producing a piston according to the invention is for example a plastic
  • PA6 Polyamide (Nylon) 6
  • PA6 Polyamide (Nylon) 6
  • the plastic material is preferably reinforced by being blended with another material, e.g. glass fibres, such that the piston better may withstand the strong forces acting on the piston when actuated.
  • a suitable material for a piston made from a single material blend is for example PA6 with 30% by weight of glass fibres.
  • PA6 is exemplified as a suitable plastic polymer, there are numerous of other suitable plastic polymers known to the skilled person in the art which are suitable to be used for manufacturing the piston .
  • the piston may be a solid rod having a circular cross sectional area or made as a hollow pipe section.
  • a rod (hollow or solid) of a metallic or non-metallic strong, load bearing material may be inserted in the hollow shell.
  • the reinforcing rod extending or stretching along the longitudinal length of the piston, should in general have a length which
  • the reinforcing rod corresponds to at least half the length of the piston, in most cases is the reinforcing rod extending at least along 80 % of the length of the piston. If a metallic reinforcing rod is used and it is stretching essentially throughout the complete length of the piston, the respective ends of the piston could be provided with a protection, e.g. a non- metallic sealing, in order to avoid direct contact between the metallic rod and the environment.
  • the piston is
  • the size of a (circular) piston is typically within the range of having a diameter of its cross sectional area of 14 to 20 millimeters and having a length of 60 to 100 millimeters .
  • the piston rod may of course have other dimensions and shapes.
  • the piston may for example comprise a rod or central stem provided with elongated bars or flanges attached by one of their longitudinal edges to the central stem along the length of the stem.
  • sectional area of the piston will thus have an appearance corresponding to a central hub having a number of spokes or bars extending radially outwards therefrom.
  • the stem and its attached flanges or bars will stretch essentially along the complete length of the piston from its first end to its second end so as to form the piston.
  • the piston may be designed such that its base has a cross sectional area corresponding to the size and geometry of the inner walls of the casing while its middle portion has a size and geometry adapted to fit in the opening through which the piston will extend when the actuator is activated.
  • the piston be constructed such that the part of the bars located in the base portion stretches in the radial direction all the way from the stem to the inner side of the housing and above the base portion has a gradually decreasing radial extension until the radial length of the bars defines a cross sectional area corresponding to or somewhat smaller than the opening area of the housing through which the piston will extend when activated.
  • the major portion of the length of the piston is normally sized to form a main body being able to extend through the opening while a minor part of the longitudinal extension of the piston forms the enlarged base portion of the piston which normally functions as a stop for the piston when it has reached its extended position in its activated state.
  • the distal ends of the flanges or bars i.e. the ends of the flanges facing away from the central stem, may be disposed equidistant from each other and the stem.
  • the flanges are preferably shaped equally and symmetrically located around the stem.
  • the specific number of flanges to be used is not critical but there should be at least three flanges attached to the stem in order to stabilize the piston in a housing, the number of flanges are normally from 3 to 8 even though more could be used.
  • the bars or flanges may be connected to each other at its distal, free ends by circumferential rings located at desired distances from each other along the length of the piston.
  • Such a design provides a strong structure suitable for making a piston of plastic material while at the same time using less material so as to lower the material costs and weight of the piston.
  • By designing the piston in an appropriate way it may be possible to include features such as a tight sealing at the opening, through which the piston will be pushed when the actuator is activated, before the piston is activated.
  • the cylinder may be provided with an elastic 0- ring at the opening for the piston in order to provide a tight seal. It will also be easy to provide a tight fit of the piston against the inner side of the wall of the housing in the other end such that the piston will be efficiently pushed when activated. Hence, the use of for example a plastic or the like material for the piston will provide benefits in getting a tight fit between the piston and the housing where desired due to the material
  • the actuator described above is particularly designed to be used in a hood lifting arrangement forming part of a pedestrian safety system in which the actuator may serve as a hood lifter.
  • a hood lifter have a particular need for environmental resistance since it is located in a position where it may suffer from moist and dirt from the environment as well as relatively strong temperature variations due to heat from the engine compartment.
  • a piston made completely or partly of a plastic or similar material such as weight, costs and resistance to oxidation or corrosion.
  • advantages are in particular present if the piston rod is manufactured completely in a plastic material.
  • the piston may thus be made using two or more different non- metallic materials or compositions for different structures of the piston, e.g. a stronger and stiffer material for building up the load bearing structure and a softer
  • the piston may be designed to use the deformation to slow down the motion of the piston to provide for a smooth stop of the movement of the piston in order to avoid or decrease oscillations of a hood lifted by the piston caused by an instant stopping of the piston.
  • the piston may be designed such that the deformation also will contribute to an improved sealing at the opening through which the piston extend after activation in order to prolong the stay up time of the piston.
  • the non-metallic material e.g. a plastic polymer composition
  • materials to be used must be selected to withstand the forces when the piston is actuated.
  • the cylinder made of, or comprising, a nonmetallic material, e.g a housing made of composition comprising carbon fibres.
  • a nonmetallic material e.g a housing made of composition comprising carbon fibres.
  • the housing since the housing must withstand rather large pressures when the actuator is activated, it may also include metallic reinforcing elements.
  • the invention is also directed to a vehicle comprising a hood lifting arrangement comprising an actuator as
  • hood lifter described herein could for example be used in the system described in US 6,530,449 and replace the actuator described therein.
  • An actuator comprising a piston made of a plastic material may be manufactured according to the following procedure.
  • a plastic piston is introduced in a housing, e.g. a pipe which may be a cold forged metallic cylinder.
  • the piston may be made to cooperate with the housing such that a tight sealing is provided at the top of the pipe, i.e. the end of the pipe through which the piston will extend when
  • the part of the piston forming the seal is made of another material, preferably softer, than the main portion of the actuator since other properties may be desired for the sealing than for the load bearing main portion of the piston.
  • a softer material in order to provide for a tight fit between the lower part and the inside of the housing to assure an efficient activation and lifting of the piston when the actuator is activated.
  • the softer material could be a softer kind of plastics, rubber or other suitable material.
  • the second end of the housing (through which the piston is inserted and will extend when actuated) may be manipulated.
  • This end portion is modified such that the cross sectional area is decreased to such an extent that a main body portion of the piston may pass through while an enlarged base portion of the piston is prevented from passing through.
  • the pipe may be manipulated by crimping.
  • the opening will then provide a stop for the piston when its base reaches the narrowing section after the actuator has been activated.
  • the opening may also include a braking portion, e.g. a slightly narrowing cross sectional area of the housing close to the final stop, whereby the piston will slow down in a smooth manner before it is completely stopped.
  • the piston is also preferably designed such that when the pipe is crimped at the end, there will be a tight seal formed between the piston and the opening in the housing.
  • the actuator is provided with a pyrotechnic charge
  • the pyrotechnic device may be inserted into the pipe at its first, lower end.
  • the pipe manipulated such that the cross sectional area is decreased and the pyrotechnical device is prevented from being able to escape out of the pipe.
  • the reduction of the cross sectional area of the pipe around the pyrotechnic device and/or at the very end of the pipe may be achieved by crimping.
  • the method may be performed by first introducing a piston and manipulating the end of the housing thereafter to form a stop for the piston followed by the introduction of the pyrotechnic device into the pipe through the other end followed by manipulation of the other end in order to secure the pyrotechnic device in the pipe thereafter.
  • the pyrotechnic device is introduced first through the first end which thereafter is manipulated followed by the introduction of the piston into the other end followed by manipulation of the second end of the pipe.
  • Still another way of assembling the actuator is to insert the piston and the pyrotechnic device firstly and
  • pyrotechnic device could be fixed by using a plug or threaded lid screwed onto a threaded portion of the
  • FIGURES 1 a-d disclose an actuator and its main parts according to an embodiment of the invention.
  • FIGURES 2 a-g disclose cross sectional views of different embodiments of a piston according to the invention.
  • FIGURES 3 a-d disclose activation stages of an actuator according to an embodiment of the present invention.
  • FIGURES 4 a-e disclose manufacturing of an actuator
  • Figure la discloses an actuator 1 comprising a housing 2, a piston 5 and a pyrotechnic device 9.
  • the figure shows a schematic view of the piston 5 and the pyrotechnic device 9 in the housing 2 which has been cut in halves along its longitudinal extension.
  • the housing 2 is in the form of a hollow cylinder or pipe section having a first, lower end 3 and a second, upper end 4 and a piston 5 at least partly made of a non-metallic material, e.g. a plastic polymer, having a piston base 14 at its lower, first end 6.
  • the piston 5 comprises a number of longitudinally stretching flanges or bars 11 extending along the length of the piston 5.
  • the bars 11 are attached at a first, longitudinal side to a central stem 12 (see figure lb) wherefrom the bars are directed radially outwards.
  • the bars 11 are connected to each other by a number of circumferential rings 13 at its other, distal end such that a cross sectional view reminds of wheel having a central hub provided with spokes.
  • the housing 2 is provided with inwardly protruding flanges 8 which serve as a partition of the cylinder and support for the piston 2 and the pyrotechnic device 9 intended to be used as a power source when activating the actuator.
  • the pyrotechnic device 9 is located at the first end 3 of the housing 2 and is connected to a cable 17 which is intended to be connected to a control unit for triggering activation of the actuator.
  • the housing 2 In the second end 4 of the housing 2 is located an opening 10 through which the piston 5 will extend when the actuator 1 is activated.
  • the housing narrowing In the upper part of the housing 1 close to its second end 4 is the housing narrowing such that the part of the housing 2 adjacent to the opening 10 will form a stopping segment 15 for the enlarged piston base 14 in order to finally stop the piston 5 when the actuator 1 is activated.
  • the section of the housing 2 right below the stopping portion 15 is only slightly narrower than the main portion of the housing 2 and forms a braking portion 16 such that an enlarged piston base 14 will be squeezed and slow down its motion before it finally reaches the stopping portion 15.
  • the braking portion 16 formed by slightly
  • FIG. lb shows a radial cross sectional view of the actuator 1.
  • the structure of the piston 5 comprising a central rod or stem 12 having flanges or bars 11 extending radially outwards therefrom such that this view reminds of a wheel having a central hub provided with spokes.
  • the portions of the flanges or bars 12 which forms the piston base 14 (se fig.
  • Figure lc discloses a side view of the piston 5 having a piston base 14 at its lower, first end 6, a middle piston main portion 18 and an anchoring portion 19 at its second, upper end 7.
  • the piston comprises longitudinally stretching flanges or bars 11 extending along the length of the piston 5 and attached at a first, longitudinal side to a central stem 12 (se figure lb) . At its other distal end are the flanges 11 attached at selected distances along the
  • the base 14 is adapted to fit closely with the inner sides of the housing such that the piston may be effectively activated by the elevated pressure from a power source, e.g. a pyrotechnic charge.
  • the part of the base 14 which is intended to be in contact with the inner side of the housing may comprise a material which is softer than the non-metallic material used in the main portion of the piston 5, e.g. for the load bearing structure formed of the bars and the central stem, in order to provide for a gas tight seal between the base 14 and a housing.
  • the upper part of the main portion 18 of the piston 5, close to the anchoring portion 19, which is intended to be in contact with the edges of an opening of a housing may also comprise a softer material in order to provide an efficient sealing of the actuator preventing dirt or moist to enter into an actuator.
  • the pistons upper part could also be an ordinary flat surface or have any desired shape.
  • a housing 2 which is divided in two parts by support flanges 8 on the inner side of the housing 2.
  • the part of the housing comprising the first end 3 is adapted to receive a pyrotechnic charge and the other part comprising the second end 4 is adapted to receive a piston and the support flanges 8 is adapted to support the piston and the pyrotechnic device when inserted into the housing 2.
  • the flanges 8 shall preferably be designed such that there is a rather large opening between the two
  • the housing 2 e.g a pyrotechnic device, to efficiently push a piston.
  • the narrowing sections may for example be made by crimping of a cold forged pipe or be prefabricated protrusions on the inside.
  • the piston described above is primarily intended to be manufactured completely by using one or several non- metallic material, e.g. PA6 which may be reinforced with glass fibres, optionally together with further materials or reinforcing structures. However, it may also comprise a load bearing structure of a metallic material and a central stem could for example comprise a metallic rod.
  • PA6 non- metallic material
  • a central stem could for example comprise a metallic rod.
  • figure 2a a shape of a piston which is similar to the shape disclosed in figure 1 but there are only six “spokes” (actually bars or flanges) instead of eight. Also in this case could there optionally be included a central stem made of metal or a reinforcing non-metallic material .
  • figure 2b a piston which is solid and has a circular radial cross sectional shape. The piston is made from a non-metallic material.
  • FIG. 2d and 2e is the plastic pipe reinforced in its central portion by a load bearing rod respectively a load bearing pipe of another material than the material used for the outer pipe.
  • the material of the reinforcing structure may be metallic or non-metallic.
  • figure 2 f-g are disclosed different shapes of solid pistons made from a single material or compound.
  • a piston having a cross shaped cross sectional area in figure 2g is the cross sectional shape of the piston circular provided with four symmetrically located semicircular cut-outs at its edges and in figure 2h is the shape octagonic.
  • these suggested pistons may be provided with a reinforcing structure, e.g. a load bearing central rod.
  • a piston which not is shaped to have a close fit with the inner side of the housing, e.g to have a cross sectional shape of a piston as disclosed in figures 2 f - g which not are circular if the housing is circular.
  • Figures 3a - 3d disclose different stages of an actuator during activation.
  • the actuator 1 shown when it is at rest before it has been activated.
  • figure 3b has the actuator been activated by triggering the pyrotechnic device 9 and the piston 5 has started to move further out of the opening 10 in the cylinder 2.
  • FIG 3c has the enlarged piston base 14 reached the location where the housing is getting narrower and the braking portion 16 on the inside of the cylinder 2 starts.
  • the piston 5 moves to be further extended through the opening 10
  • its base 14 will start to deform somewhat while the movement of the piston will be braked or slowed down at the same time.
  • figure 3d has the piston 5 reached its end position in which the piston 5 is pushed by the pressure in the cylinder 2 such that the frustoconical part of the piston base 14 rests on the wedge shaped stopping portion 15 of the cylinder 2.
  • the inclusion of the braking portion 16 and wedge shaped stopping portion 15 of the housing 2 adapted to the conical shape of the base 14 of the piston 2 shown in association with figure 3 involves beneficial features which are particularly suitable for a plastic or non- metallic piston.
  • the plastic piston may of course have other shapes and could also be an ordinary solid rod provided with an enlarged base plate, e.g a piston having an ordinary T-shaped longitudinal cross sectional profile and having a stop at the upper part of the housing adapted to a changed shape of the base portion of the piston, e.g. an ordinary edge being orthogonal to the inner wall of the cylinder .
  • FIGS 4a - 4e is disclosed an example of how an actuator 1 according to the invention may be assembled and produced from a housing 2 in the form of a hollow cylinder or pipe and a piston 5.
  • FIG 4a is shown a housing 2 which has been provided with protrusions on the inside of the pipe forming
  • the housing 2 may for example be a cold forged pipe made of metal.
  • FIG 4b is shown how the piston 5 has been introduced into the housing 2.
  • the piston has been introduced through the opening 10 at the second end 4 of the pipe.
  • the piston 5 may be made such that the part of the piston forming the seal is made of a softer material than its load bearing structure .
  • FIG 4c is shown that when the piston 5 has been located in the housing 2, the pipe is crimped close to its second end 4 in order to provide a narrowing section forming a stopping portion 15 and a braking portion 16 and to provide a close fit between the piston 5 and the pipe at its second end so as to form a tight seal.
  • the decreased cross sectional area of the housing 2 will thus provide for an efficient sealing of the actuator before it is activated as well as forming a stopping restriction for an enlarged base 14 of the piston 5 when the actuator is activated.
  • figure 4d has a pyrotechnic device 9 been introduced into the housing 2 at its first end 3.
  • figure 4e has the housing 2 been crimped at the very end of its first end 3 of the pipe 2 in order to keep the pyrotechnic device 9 in its desired position, clamping it between the crimped end portion 3 and the supporting flanges 8, and preventing it from escaping out of the housing 2.
  • the assembling may be made in the order of appearance of the figures as described above. However, it may also be possible to introduce the
  • the essential feature is to perform the crimping at the ends after the devices, i.e. the piston and the pyrotechnic device, has been introduced into the housing at the respective ends.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Actuator (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

L'invention porte sur un actionneur (1) pour un agencement de soulèvement de capot dans un système de sécurité de véhicule afin de produire une protection pour un piéton heurté par le véhicule, et sur un véhicule comprenant un tel système comprenant l'actionneur (1). L'actionneur (1) comprend un boîtier (2) ayant une première extrémité (3) et une seconde extrémité (4) et un piston (5) ayant une première extrémité (6) et une seconde extrémité (7) adapté à se loger dans le boîtier (2). La première extrémité (3) du boîtier (2) est adaptée à comprendre, ou à être reliée à, une source de puissance, et la seconde extrémité (4) du boîtier (2) comporte une ouverture (10) à travers laquelle ledit piston (5) s'étendra quand l'actionneur (1) sera activé. Le piston (5) comprend un matériau non métallique, par exemple un polymère plastique. Le piston (5) peut être constitué complètement par un ou plusieurs matériaux ou compositions non métalliques. Le piston (5) peut se présenter sous la forme d'une tige centrale (12) comportant des barres (11) s'étendant le long de la longueur de la tige (12) et attachées à la tige (12) par un premier bord longitudinal de la barre (11). Les barres (11) se ré-étirent radialement vers l'extérieur à partir de la tige (12). Facultativement, les extrémités longitudinales distales des barres (11) peuvent être reliées entre elles par des éléments de forme annulaire (13). L'invention porte également sur un procédé de fabrication pour un actionneur (1) comprenant un boîtier (2), un piston (5) et un dispositif pyrotechnique (9).
EP11863919.4A 2011-04-18 2011-04-18 Agencement de soulèvement de capot et procédé pour produire un actionneur Withdrawn EP2699456A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2011/050466 WO2012144940A1 (fr) 2011-04-18 2011-04-18 Agencement de soulèvement de capot et procédé pour produire un actionneur

Publications (2)

Publication Number Publication Date
EP2699456A1 true EP2699456A1 (fr) 2014-02-26
EP2699456A4 EP2699456A4 (fr) 2014-10-01

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Country Status (3)

Country Link
EP (1) EP2699456A4 (fr)
CN (1) CN103476641A (fr)
WO (1) WO2012144940A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6116334B2 (ja) 2012-07-13 2017-04-19 タカタ株式会社 ガス圧式アクチュエータ及びその組付方法
CN106458143B (zh) * 2014-04-15 2019-09-13 Tk控股公司 硅树脂推进的行人发动机罩提升装置和座椅安全带预张紧器
JP6565764B2 (ja) * 2016-03-30 2019-08-28 豊田合成株式会社 アクチュエータ
AT523653B1 (de) * 2020-03-24 2021-10-15 Hirtenberger Automotive Safety Gmbh & Co Kg Pyrotechnischer Aktuator

Citations (5)

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Publication number Priority date Publication date Assignee Title
GB1244460A (en) * 1969-04-23 1971-09-02 Kloeckner Werke Ag Piston and cylinder assembly
US5941162A (en) * 1997-12-23 1999-08-24 Caterpillar Inc. Piston
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WO2012144940A1 (fr) 2012-10-26
CN103476641A (zh) 2013-12-25

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