EP2684748B1 - Unité d'activation pour un système de sécurisation d'un véhicule automobile - Google Patents

Unité d'activation pour un système de sécurisation d'un véhicule automobile Download PDF

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Publication number
EP2684748B1
EP2684748B1 EP20130179282 EP13179282A EP2684748B1 EP 2684748 B1 EP2684748 B1 EP 2684748B1 EP 20130179282 EP20130179282 EP 20130179282 EP 13179282 A EP13179282 A EP 13179282A EP 2684748 B1 EP2684748 B1 EP 2684748B1
Authority
EP
European Patent Office
Prior art keywords
activation unit
nozzle body
unit according
nozzle
flow
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.)
Not-in-force
Application number
EP20130179282
Other languages
German (de)
English (en)
Other versions
EP2684748A1 (fr
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
Priority claimed from EP12007233.5A external-priority patent/EP2722239B1/fr
Priority claimed from EP13176726.1A external-priority patent/EP2826678B1/fr
Application filed by Metalsa Automotive GmbH filed Critical Metalsa Automotive GmbH
Priority to EP20130179282 priority Critical patent/EP2684748B1/fr
Publication of EP2684748A1 publication Critical patent/EP2684748A1/fr
Application granted granted Critical
Publication of EP2684748B1 publication Critical patent/EP2684748B1/fr
Not-in-force 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
    • F15B15/08—Characterised by the construction of the motor unit
    • 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

Definitions

  • the expansion pressure can be used in addition to the filling of an airbag for generating a displacement movement of a security system.
  • the gas flow emerging when the gas generator is triggered into a rotational movement that can be used by a safety system it is already known to divert the gas flow in such a way that in that a rotor shaft of the activation unit that can be connected to a safety system is set into a rotational movement.
  • the invention has for its object to provide an activation unit, which is particularly compact and has a high drive power.
  • Characteristic of the activation unit according to the invention is that the drive unit, which is downstream of the gas generator in the flow direction of the exiting gas stream and which serves to convert the gas stream exiting upon activation of the gas generator into a rotational movement of the rotor shaft, comprises a nozzle arranged in the flow direction of the exiting gas, with at least a flow channel for directing the gas flow on a rotor shaft connected to the impeller.
  • the gas flow transported through the flow channel of the nozzle is directed in an exactly predetermined manner onto the impeller connected to the rotor shaft, so that an optimal conversion of the expansion pressure into a rotational movement is possible.
  • the design and orientation of the flow channel of the nozzle is adaptable, inter alia, to the geometry of the blades of the blade wheel, so that overall a particularly high efficiency can be achieved.
  • the use of a nozzle as a function of the nozzle geometry allows acceleration of the gas flow in the direction of the impeller, so that the conversion of the expansion pressure into a kinetic energy in this way compared to a nozzle-free use of the gas stream has a higher efficiency.
  • the use of a nozzle allows the generation of a high number of revolutions and a high torque, which can be used to drive the connectable to the rotor shaft security systems.
  • Particularly advantageous is the use of a nozzle geometry, in which the exiting gas stream is accelerated to supersonic, whereby a particularly high drive torque can be generated on the rotor shaft.
  • the flow channel is formed in the manner of a Laval nozzle.
  • the flow channel initially has a convergent and then a divergent cross section, wherein the gas flowing through the flow channel is accelerated to supersonic speed. This makes it possible to produce a particularly high efficiency with a high torque on the rotor shaft.
  • the cross-sectional area perpendicular to the flow direction after a narrowest, critical cross-section in the direction of the flow is greater, without falling below a too small radius of curvature of the flow channel, or to exceed a maximum suitable opening angle.
  • the flow channel has a curved, in particular helical course.
  • the drive unit particularly compact, wherein the flow channel nevertheless has due to its helical winding configuration of sufficient length to accelerate the transported through the flow channel gaseous medium in the desired manner.
  • the curved, in particular helical design of the flow channel allows the production of nozzles which have a sufficient flow channel length and at the same time, viewed in the longitudinal axis direction of the rotor shaft, allow a compact configuration of the activation unit.
  • the nozzle may be formed by a base body, which is arranged downstream of the gas generator and has one or more flow channels with a freely selectable cross section. It is conceivable, for example, to manufacture the nozzle, in which the flow channel is formed in the region between an inner tube and an outer tube, which are provided with corresponding contours in the contacting surfaces. It is also possible, a housing that can be used with an inner surface to form a Laval nozzle, in a particularly lightweight form of a wound fiber composite plastic pipe or inexpensive to form a metal tube.
  • the flow channel is formed by a groove introduced into a peripheral surface of a nozzle body and by a nozzle body surrounding the nozzle body in the region of the groove.
  • the nozzle first comprises a nozzle body, for example a cylindrical base body, which has on its peripheral surface a groove which forms part of the flow channel.
  • the flow channel is delimited in the area surrounding the base body by a nozzle body shell whose inner wall forms the flow channel in the region of the groove together with the groove surface.
  • This embodiment of the nozzle can be produced in a particularly simple and cost-effective manner.
  • the number of flow channels can be set in a simple manner on the number of grooves.
  • the grooved base body with the nozzle body shell.
  • the groove is helically coiled on the peripheral surface of the nozzle body, for example.
  • the cylindrical base body formed. In this way, a simple steering of the gas flow can be achieved, in which this impinges in an optimal manner on the blades of the impeller and thus contributes to a high efficiency.
  • the number of flow channels is always freely selectable. According to an advantageous development of the invention, at least two, preferably four, flow channels are arranged adjacent to one another. As a result, a particularly high efficiency of the activation unit is achieved, wherein in addition to a high number of revolutions, a high torque is simultaneously generated on the rotor shaft.
  • the orientation of the flow channels is uniformly distributed at a distance from each other, so as to have a high impact achieve.
  • the nozzle body for example, the cylindrical base body, which has the grooves provided for the flow channels and is introduced into a nozzle shell, can in principle be formed from any desired material. According to a particularly advantageous embodiment of the invention, however, it is provided that the nozzle body is made of a plastic, in particular by injection molding. The use of a plastic for the production of the nozzle body makes it possible to produce this particularly cost-effectively. It is possible to form the flow channel already in the manufacturing process of the nozzle body, so that can be dispensed with a further post-processing. As a result, the manufacturing costs can be reduced in a complementary manner.
  • the design of the nozzle body shell to form a closed flow channel is also basically freely selectable.
  • the nozzle body shell can be configured as a separate shell, which is arranged coaxially to the grooved base body, so that the flow channel is formed by the groove surfaces and arranged in this area inner surface of the nozzle body shell.
  • the nozzle body shell is formed by a portion of a housing of the activation unit.
  • the nozzle body is arranged within the housing of the activation unit such that an inner wall of the housing together with the nozzle body forms the nozzle.
  • the flow channel is delimited in this case by the arranged in the region of the groove inner surface of the housing.
  • One or more flow channels are formed on the nozzle body, the nozzle body being arranged in the activation unit in such a way that, in the case of activation of the gas generator, reliable guidance of the gas flow to the blades of the blade wheel is ensured.
  • the nozzle body is also designed for rotatable mounting of the rotor shaft is.
  • the rotor shaft can be stored at one end on the nozzle body, so that can be dispensed with additional storage means. This makes it possible to design the activation unit in a particularly compact and cost-effective manner.
  • the housing can be formed in principle of any material. According to a particularly advantageous embodiment of the invention, however, it is provided that the housing is formed as a die-cast housing made of plastic or as a metal casting.
  • the suitably designed housing can be produced in a particularly simple and cost-effective manner and, moreover, has the pressure resistance necessary for operation.
  • the design of the paddle wheel in particular the shape of the blades, can basically be freely selected depending on the required drive torque and the required drive speed.
  • turbine-like blades basically any blade geometries can be used.
  • the blades are designed for radial flow.
  • a particularly high drive torque can be achieved, wherein the flow channels are formed such that they cause a corresponding radial flow of the blade wheel.
  • the in the FIGS. 1 to 4 illustrated activation unit has a cylindrical housing 6, within which a gas generator 4 is connected via a housing cover 14 with the housing 6.
  • the activation unit 1 further comprises a drive unit 2, which for converting the gas flow occurring in an activation of the gas generator 4 in a rotational movement of a rotor shaft 3 connected to the rotor shaft 3 paddle wheel 9 and a nozzle body 5 and the housing 6 nozzle for steering of the occurring during activation of the gas generator 4 gas flow to the paddle wheel 9.
  • the pot-shaped nozzle body 5, which is arranged in sections coaxially with the gas generator 4, has helically extending grooves 7 on its outer circumferential surface. Coaxially with the nozzle body 5, a portion of the housing inner wall 12 is arranged such that it forms the flow channels 13 together with the grooves 7; by which the expansion gas emerging from the gas generator 2 is directed to the blades 10 of the blade wheel 9.
  • the shape of the grooves 7 is formed in the manner of a Laval nozzle, with the groove 7 tapers to a constriction 8 and then widens again.
  • the gas emerging from the gas generator 2 is accelerated to supersonic speed and directed onto the blades 10 of the blade wheel 9, causing it to rotate, so that a drive torque is available on the rotor shaft 3.
  • the nozzle body 5 is made as an injection molded part and also serves with a bearing 11 for supporting the rotor shaft 3.
  • the pressure-stable produced pressure-stable housing 6 of the activation unit 1 ensures high reliability in the event of activation of the gas generator. 4

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Automotive Seat Belt Assembly (AREA)

Claims (10)

  1. Unité d'activation pour un système de sécurisation d'un véhicule automobile, avec
    - un générateur de gaz pyrotechnique (4) et
    - une unité d'entraînement (2) en liaison fonctionnelle avec le générateur de gaz pyrotechnique (4), pour la transformation du flux de gaz sortant lors d'une activation du générateur (4) en un mouvement de rotation d'un arbre de rotor (3) susceptible d'être relié au système de sécurité,
    caractérisée en ce que
    l'unité d'entraînement (2) présente une buse agencée dans la direction d'écoulement du gaz sortant, avec au moins un canal d'écoulement (13) destiné à guider le flux de gaz sur une roue à palettes (9) reliée à l'arbre de rotor (3), le canal d'écoulement (13) étant conçu à la manière d'une tuyère de Laval.
  2. Unité d'activation selon la revendication 1, caractérisée en ce que le canal d'écoulement (13) présente une évolution courbe, en particulier une évolution en forme d'hélice.
  3. Unité d'activation selon la revendication 1 ou 2, caractérisée en ce que le canal d'écoulement (13) est formé par une rainure (7) intégrée dans une surface périphérique d'un corps de buse (5) et par une enveloppe de corps de buse (6) entourant le corps de buse (5) dans la région de la rainure (7).
  4. Unité d'activation selon l'une des revendications précédentes, caractérisée en ce que la rainure (7) s'étend en spirale en forme de ligne d'hélice sur la surface périphérique du corps de buse (5).
  5. Unité d'activation selon l'une des revendications précédentes, caractérisée en ce qu'au moins deux, de préférence quatre, canaux d'écoulement (13) sont côte à côte.
  6. Unité d'activation selon l'une des revendications précédentes, caractérisée en ce que le corps de buse (5) est constitué d'un plastique, en particulier à l'aide d'un procédé de moulage par injection.
  7. Unité d'activation selon l'une des revendications précédentes, caractérisée en ce que l'enveloppe de corps de buse est formée par une section d'un boîtier (6) de l'unité d'activation (1).
  8. Unité d'activation selon l'une des revendications précédentes, caractérisée en ce que le corps de buse (5) est conçu pour un montage rotatif de l'arbre de rotor (3).
  9. Unité d'activation selon l'une des revendications précédentes, caractérisée en ce que le boîtier (6) est formé comme un boîtier en plastique moulé sous pression ou comme une pièce moulée en métal.
  10. Unité d'activation selon l'une des revendications précédentes, caractérisée en ce que la roue à palettes (9) est conçue pour un flux incident radial.
EP20130179282 2012-10-19 2013-08-05 Unité d'activation pour un système de sécurisation d'un véhicule automobile Not-in-force EP2684748B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20130179282 EP2684748B1 (fr) 2012-10-19 2013-08-05 Unité d'activation pour un système de sécurisation d'un véhicule automobile

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP12007233.5A EP2722239B1 (fr) 2012-10-19 2012-10-19 Unité d'entraînement pour un système de sécurité d'un véhicule
EP13176726.1A EP2826678B1 (fr) 2013-07-16 2013-07-16 Unité d'activation pour un système de sécurisation d'un véhicule automobile
EP20130179282 EP2684748B1 (fr) 2012-10-19 2013-08-05 Unité d'activation pour un système de sécurisation d'un véhicule automobile

Publications (2)

Publication Number Publication Date
EP2684748A1 EP2684748A1 (fr) 2014-01-15
EP2684748B1 true EP2684748B1 (fr) 2015-04-01

Family

ID=48906185

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20130179282 Not-in-force EP2684748B1 (fr) 2012-10-19 2013-08-05 Unité d'activation pour un système de sécurisation d'un véhicule automobile

Country Status (1)

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EP (1) EP2684748B1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2814487C2 (de) * 1978-04-04 1983-11-24 Repa Feinstanzwerk Gmbh, 7071 Alfdorf Rückstrammer mit pyrotechnischem Treibsatz für Sicherheitsgurtwickelautomaten
DE3606021A1 (de) * 1986-02-25 1987-08-27 Ernst Hans Hellmut Rotatorischer gurtstrammer fuer sicherheitsgurte
GB2314755B (en) * 1996-07-05 2000-08-23 Autoliv Dev Improvements in or relating to a safety-belt pretensioner

Also Published As

Publication number Publication date
EP2684748A1 (fr) 2014-01-15

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