EP2166233A1 - Zylinder mit progressiver Wirkung - Google Patents

Zylinder mit progressiver Wirkung Download PDF

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Publication number
EP2166233A1
EP2166233A1 EP08290872A EP08290872A EP2166233A1 EP 2166233 A1 EP2166233 A1 EP 2166233A1 EP 08290872 A EP08290872 A EP 08290872A EP 08290872 A EP08290872 A EP 08290872A EP 2166233 A1 EP2166233 A1 EP 2166233A1
Authority
EP
European Patent Office
Prior art keywords
piston
chamber
housing
cylinder body
cylinder
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.)
Granted
Application number
EP08290872A
Other languages
English (en)
French (fr)
Other versions
EP2166233B1 (de
Inventor
Nicolas Caillaut
Xavier Vilars
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.)
Nexter Munitions SA
Original Assignee
Nexter Munitions 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 Nexter Munitions SA filed Critical Nexter Munitions SA
Priority to EP08290872A priority Critical patent/EP2166233B1/de
Publication of EP2166233A1 publication Critical patent/EP2166233A1/de
Application granted granted Critical
Publication of EP2166233B1 publication Critical patent/EP2166233B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/204—Control means for piston speed or actuating force without external control, e.g. control valve inside the piston

Definitions

  • the technical sector of the present invention is that of pyrotechnic devices and more particularly actuators actuated by pyrotechnics.
  • emergency opening devices are provided for certain buildings or vehicles (especially on board aircraft). These devices use pneumatic cylinders, hydraulic or pyrotechnic. Pneumatic and hydraulic cylinders have the disadvantage of being subject to leakage problems, which requires special monitoring and maintenance. Storing the fluid and maintaining pressure of certain elements is also a drawback. Known pyrotechnic cylinders have the disadvantage of operating violently, which can lead to the destruction of the opening door.
  • the object of the present invention is to provide a pyrotechnic jack with progressive action and / or timed not having the disadvantages mentioned above.
  • the invention therefore relates to a jack of the type comprising a pyrotechnic gas generator and comprising a cylindrical cylinder body, in which slides a rod integral with a piston, said piston defining a first chamber and a second chamber, characterized that the piston comprises at least one vent allowing the calibrated passage of the gas generated by the generator between the two chambers.
  • the pyrotechnic gas generator is carried by the piston.
  • the piston comprises holes allowing the passage of gas between the pyrotechnic gas generator and the first chamber.
  • the piston has a first face in contact with the first chamber and a second face in contact with the second chamber, the surface of the second face being greater than the surface of the first face.
  • the piston comprises at its end a peripheral ring.
  • the ring device comprises removable securing means for making the peripheral ring integral with the piston and / or the cylinder body.
  • a removable fastening means is in the form of a locking piston provided with two opposite fingers, a first finger being intended to cooperate with a housing in the piston and a second finger opposite the first finger, being intended to cooperate with at least one housing in the cylinder body, a spring providing a radial thrust of the locking piston to the cylinder body.
  • the locking piston defines two enclosures, a first chamber being connected to the first chamber and a second chamber being connected to the second chamber.
  • the second housing of the cylinder body will have a depth greater than that of the first housing, the depth of the second housing being chosen so that, when the second finger is engaged in the second housing, the first finger is will find clear of the housing of the piston.
  • the jack may comprise a compression spring interposed between a cap of the cylinder body and the piston.
  • the jack comprises means for evacuating gases to the outside of the jack.
  • a first advantage of the cylinder according to the invention lies in the fact that it provides a gradual effort and timed.
  • Another advantage lies in the fact that after being actuated, the cylinder rod can be repositioned in its initial position.
  • the figure 1a is a sectional view illustrating a first embodiment of a pyrotechnic cylinder according to the invention for actuating an aircraft door.
  • the pyrotechnic jack consists of a cylinder body 1 cylindrical, having a bore in which slides a rod 2, in the extension of which is fixed (for example by screwing) a piston 5 whose end has a shoulder 13 of diameter substantially equal to the inside diameter of the cylinder body 1.
  • the cylinder body 1 will be, for example, connected to the door of the aircraft and the rod 2 will be integral with the cabin of the aircraft (no represented), for example by means of a connecting rod or a ball joint (not shown).
  • the bore of the cylinder body 1 comprises an internal collar 17, of internal diameter substantially equal to the outer diameter of the rod 2, to ensure the centering between the cylinder body 1 and the rod 2. Moreover, the seal will be provided by one or more O-rings 29 secured to the flange 17 and applied against the rod 2 of the jack.
  • a pyrotechnic gas generator 4 and an initiator 3 are carried by the piston 5.
  • the shoulder 13 of the piston 5 delimits, with the cylinder body 1, a first chamber A and a second chamber B.
  • the shoulder 13 will carry one or several O-rings 30 which will be applied against the cylinder body 1 and which will seal at this level between the two chambers A and B defined by the piston 5.
  • the cylinder body 1 On the side of the chamber A, the rod 2 and the seal or seals carried by the inner collar 17 seal.
  • the cylinder body 1 On the side of the chamber B, the cylinder body 1 is closed by a plug 9, a tubular portion 14 is inserted into the chamber B, thus preventing any translation of the piston 5 to the plug 9.
  • the tubular portion may advantageously be threaded to also ensure the connection between the plug 9 and the cylinder body 1.
  • the piston 5 also comprises a particle filter 8 and holes 12 for expanding the gases generated by the generator 4 in the first chamber A.
  • the shoulder 13 of the piston comprises at least one vent 11 allowing the calibrated passage of the gas generated between the chamber A and the chamber B.
  • the or vents may affect the form of nozzles or venturis to improve the passage of gases.
  • the rod 2 comprises oblique channels 15 opening into the chamber A and oriented towards the front of the rod 2.
  • the rod 2 also comprises a collar 16 constituting an abutment limiting the translation of the rod 2 in the cylinder body 1.
  • the piston 5 has a first face SA in contact with the first chamber A and a second face SB in contact with the second chamber B.
  • the second face SB has a surface greater than the surface of the first face SA.
  • the figure 1b is a partial sectional view illustrating the same embodiment as that described in connection with the figure 1a , but after actuation of the cylinder, that is when its rod 2 has moved. It can be distinguished in this view that the collar 16 of the rod 2 abuts against the collar 17 of the cylinder body 1 and that the oblique channels 15 open out of the cylinder.
  • the pyrotechnic gas generator 4 is integral with the piston rod 2 and the gases it generates are directed firstly towards the first chamber A and not to the second chamber B which is nevertheless that in which it is normally necessary to introduce a gas pressure to cause the output of the rod of the cylinder.
  • An increase in pressure in the first chamber A leads indeed to push the rod of the jack against the plug 9.
  • the actuator is then actuated by an electrical signal to the initiator 3 which triggers the generation of gas by the pyrotechnic generator 4.
  • the generated gas diffuses through the particulate filter 8 and then passes through the bores 12 in order to penetrate the first chamber A.
  • the pressure in the chamber A is then greater than the pressure of the chamber B.
  • the piston 5 is blocked by the plug 9 and therefore remains stationary. Because of the pressure difference, the gas from the chamber A enters the chamber B by the or the vents 11.
  • the latter are sized to calibrate the gas flow.
  • the pressure in chamber B increases as the pressure in chamber A decreases.
  • the forces applied to the piston 5 by the pressures in the chambers A and B evolve until, due to the difference in surfaces of the faces SA and SB of the piston, the force FB applied to the face SB is greater than the FA effort applied on the SA face.
  • the piston 5 and the rod 2 then move in the direction of the force FB, until the collar 16 is in contact with the inner collar 17.
  • the channels 15 allow communication between the chamber A and the outside of the cylinder.
  • the generated gases are evacuated and the rod 2 of the cylinder can then be manually depressed to close the door. It will be noted that, even when the piston 5 moves, the generated gases continue to move from the chamber A to the chamber B, thus increasing the force FB, which makes it possible to produce a jack with a timed and progressive operation.
  • the diameter of the or vents 11 is chosen according to the desired time for the start of operation of the cylinder from its initiation.
  • the figure 2 illustrates another embodiment of the invention.
  • the shoulder at the end of the piston 5 is replaced by a peripheral ring 6.
  • the peripheral ring 6 comprises removable securing means 7 (not visible in this figure) to make the peripheral ring 6 integral. of the piston 5 and / or the cylinder body 1.
  • removable securing means will be described more specifically in relation to the Figures 3a to 3c .
  • the tubular portion of the cap 9 has been replaced by a spring 18.
  • the ring 6 also includes the essential feature of the invention consisting of at least one vent 11 allowing the calibrated passage of a gas between the chamber A and room B.
  • This embodiment also comprises a pyrotechnic gas generator 4 and an initiator 3 carried by the piston 5.
  • the dotted line 6 is shown in its position IIIc at the end of the stroke, as described in connection with FIG. figure 3c .
  • the rod 2 is not in the initial position as visible on the figure 2 .
  • the rod 2 is secured to the ring 6 and is therefore driven by the movement of the ring.
  • the particle filter and the holes which allow the passage of the generated gases from the generator 4 to the first chamber A have not been shown but are also implemented.
  • the internal bore of the piston 1 has a cylindrical portion 28 of reduced diameter.
  • the diameter of the portion 28 is slightly greater than the diameter of the collar 16 to create a "rolling" effect when the rod 2 moves and the collar 16 engages in the bore of reduced diameter 28.
  • Such an embodiment advantageously allows to cause braking and damping of the rod 2 at the end of the race.
  • the spring 18 exerts a thrust on the piston 5 which is added to that generated by the differential gas pressure between the chambers A and B. This action of the spring 18 compensates for the complementary resisting force due to the braking of the rod 2 at the end of the race.
  • the Figure 3a to 3c illustrate the embodiment and operation of a removable fastening means.
  • the removable securing means 7 is disposed in a housing of the peripheral ring 6 and is in the form of a locking piston 7a provided with two opposite fingers 7b and 7c, a first finger 7b being adapted to cooperate with a housing 20 in the piston 5 and a second finger 7c, opposite the first finger 7b, being intended to cooperate with a first housing 19 and a second housing 21 (visible on the figure 3c ) in the cylinder body 1.
  • the locking piston 7a defines two enclosures 25 and 26 in the ring 6.
  • the first chamber 25 is connected to the first chamber A via a bore 22 and the second chamber 26 is connected to the second chamber B via a bore 23.
  • a spring 24 exerts a permanent force on the locking piston 7a in the direction of the cylinder body 1.
  • the housings 19, 20 and 21 may be in the form of holes or throats.
  • the embodiment in the form of grooves allows an angular offset of the piston relative to the cylinder body 1 without impairing the operation of the removable fastening means.
  • the figure 3a illustrates the detachable fastening means in the rest position, that is to say when the actuator is not actuated.
  • the fingers 7b and 7c are inserted into their respective housings 20 and 19 and thus hold integral the cylinder body 1, the peripheral ring 6 and the piston 5.
  • the force exerted by the spring 24 on the locking piston 7a is enough to maintain the second finger 7c in the first housing 19 of the cylinder body.
  • the figure 3b illustrates the detachable fastening means when the jack is actuated.
  • the gas pressure increases in the first chamber A (as described above), the generated gases enter the chamber 25 and move the locking piston 7a to the piston 5.
  • the first finger 7b has a space sufficient to penetrate deeper into the piston housing, while the second finger 7c disengages from the first housing 19 of the cylinder body.
  • the peripheral ring 6 and the piston 5 are integral with each other and free with respect to the cylinder body 1 in which they can slide as described above. It is therefore no longer necessary here to provide (as in the previous embodiment) shear pins between the piston and the cylinder body.
  • the figure 3c illustrates the removable fastening means when the rod 2 and the piston are at the end of the race.
  • the second finger 7c is located opposite the second housing 21 of the cylinder body. Thanks to the vent 11 (not visible in this figure) described above, the chambers A and B are in communication, their internal pressures therefore tend to equilibrate. Once these pressures are substantially equal, the locking piston 7a is subject only to the force of the spring 24 and away from the cylinder body 5.
  • the second finger 7c then enters the second housing 21 of the body of cylinder.
  • the second housing 21 has a depth which is greater than that of the first housing 19. The depth of the second housing 21 is chosen so that when the second finger 7c is engaged in the second housing 21, the first finger 7b is located Moreover, released from the housing 20 of the piston 5.
  • peripheral ring 6 is then secured to the cylinder body and the piston 5 and the rod 2 can slide freely in the opposite direction in the cylinder body 1, thus allowing the cylinder to be repositioned in its initial configuration.
  • a single securing means 7 is described in relation with the Figures 3a to 3c but it will be possible to have several of these means (for example three means 7 regularly distributed angularly) in the peripheral ring 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Damping Devices (AREA)
  • Actuator (AREA)
EP08290872A 2008-09-17 2008-09-17 Zylinder mit progressiver Wirkung Active EP2166233B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08290872A EP2166233B1 (de) 2008-09-17 2008-09-17 Zylinder mit progressiver Wirkung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08290872A EP2166233B1 (de) 2008-09-17 2008-09-17 Zylinder mit progressiver Wirkung

Publications (2)

Publication Number Publication Date
EP2166233A1 true EP2166233A1 (de) 2010-03-24
EP2166233B1 EP2166233B1 (de) 2013-03-27

Family

ID=40251850

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08290872A Active EP2166233B1 (de) 2008-09-17 2008-09-17 Zylinder mit progressiver Wirkung

Country Status (1)

Country Link
EP (1) EP2166233B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112014002455B4 (de) 2013-05-17 2024-05-02 Arianegroup Sas Pyrotechnischer Gasgenerator

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3535065A (en) * 1966-07-15 1970-10-20 Nationale Sa Igniter cartridge
FR2167270A5 (de) * 1972-01-11 1973-08-24 Ferodo Sa
GB1407954A (en) * 1973-02-26 1975-10-01 Nissan Motor Actuator for safety seat belt system
US3917031A (en) * 1973-08-03 1975-11-04 Poudres & Explosifs Ste Nale Novel pyrotechnic tensioning device for use with safety belts
US6095051A (en) * 1998-08-13 2000-08-01 Saxby; Michael Ernest Self loading gun cartridge
WO2004071821A1 (de) * 2003-02-12 2004-08-26 Autoliv Development Ab Fussgängerschutzeinrichtung an einem kraftfahrzeug

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3535065A (en) * 1966-07-15 1970-10-20 Nationale Sa Igniter cartridge
FR2167270A5 (de) * 1972-01-11 1973-08-24 Ferodo Sa
GB1407954A (en) * 1973-02-26 1975-10-01 Nissan Motor Actuator for safety seat belt system
US3917031A (en) * 1973-08-03 1975-11-04 Poudres & Explosifs Ste Nale Novel pyrotechnic tensioning device for use with safety belts
US6095051A (en) * 1998-08-13 2000-08-01 Saxby; Michael Ernest Self loading gun cartridge
WO2004071821A1 (de) * 2003-02-12 2004-08-26 Autoliv Development Ab Fussgängerschutzeinrichtung an einem kraftfahrzeug

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112014002455B4 (de) 2013-05-17 2024-05-02 Arianegroup Sas Pyrotechnischer Gasgenerator

Also Published As

Publication number Publication date
EP2166233B1 (de) 2013-03-27

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