WO2017005718A1 - Tensioning device with a sealing device - Google Patents

Tensioning device with a sealing device Download PDF

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Publication number
WO2017005718A1
WO2017005718A1 PCT/EP2016/065768 EP2016065768W WO2017005718A1 WO 2017005718 A1 WO2017005718 A1 WO 2017005718A1 EP 2016065768 W EP2016065768 W EP 2016065768W WO 2017005718 A1 WO2017005718 A1 WO 2017005718A1
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WO
WIPO (PCT)
Prior art keywords
pressure chamber
protective tube
seal
sealing
tube
Prior art date
Application number
PCT/EP2016/065768
Other languages
German (de)
French (fr)
Inventor
Jens Ehlers
Julia BIGGE
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 WO2017005718A1 publication Critical patent/WO2017005718A1/en

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Classifications

    • 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
    • B60R22/1952—Transmission of tensioning power by cable; Return motion locking means therefor
    • 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

Definitions

  • the present invention relates to a tensioning device for a safety belt with a tightening tube for receiving and guiding a compressed-gas-driven piston, a connected to the tensioner tube, a Seilum- steering forming deflecting block in which an adjoining the rope deflection pressure chamber and a receptacle for a gas generator are formed, as well as with a tension cable connected to the piston, which is connectable with a seat belt to be offset in a tensioning movement and enters from the cable deflection in the pressure chamber and passes through the pressure chamber, wherein for sealing the pressure chamber at a The deflection-side end of the pressure chamber is arranged a seal enclosing the traction cable and wherein the traction cable within the pressure chamber is surrounded by a protective tube.
  • a tensioning device with the aforementioned features is known from EP 2 082 926 B1, wherein the seal and the protective tube are formed by a one-piece component.
  • the one-piece component is fixed by means of a retaining ring in the pressure chamber.
  • the retaining ring makes it difficult to install the one-piece sealing element, since the sealing ring must be placed in the lowest of the pressure chamber accessible from the open side of the deflection block.
  • it must be ensured that the protective tube of the one-piece sealing element is aligned concentrically in the pressure chamber, since subsequently the pull rope must be mounted through the protective tube.
  • the object of the present invention is therefore to at least partially solve the problems described with reference to the prior art and, in particular, to provide a tensioning device which is easier to assemble and at the same time reduces force transmission to the seal through the protective tube during the tightening process is.
  • a tensioning device with the features mentioned in the introduction, wherein the seal, the protective tube and a retaining element centering the protective tube in a transition region from the deflection block into the tension tube are inserted into the pressure chamber as a sealing device, wherein between The seal and the protective tube and between the protective tube and the holding element tear-off are formed along which the sealing device is destructible during a tightening process, so that the protective tube of the moving during the tensioning process of the piston pull rope is entrained and the seal and the retaining element at their Mounting points remain.
  • the holding element is a sealing element sealing the pressure chamber in the transition region from the deflection block into the tensioner tube.
  • the seal, the protective tube and the holding element designed in particular as a sealing element can be inserted into the deflection block for mounting as a sealing device or assembly.
  • the protective tube on which the pulling rope acts the largest forces during the tightening process from which in particular force and / or form-fitting in the tensioning device fixed holding element and the particular force and / or positive locking in the tensioning device seal along the tear-off.
  • the sealing element remains in its position sealing the pressure chamber in the transition region to the tensioner tube after the detachment of the tear-off connection.
  • the sealing device is formed in one piece and the tear-off connections are designed as predetermined breaking points.
  • the sealing device can be manufactured as a one-piece component, which can be produced for example with an injection molding tool. It is then preferred that the one-piece sealing device is produced in a multi-component injection molding process, in which the seal and the sealing element are formed from a different material than the protective tube.
  • the sealing device is assembled from several parts to form a module before it is mounted in the deflection block.
  • the seal, the holding element or the sealing element and the protective tube can be optimally designed for their respective requirements.
  • the holding element, the seal and the protective tube are connected to one another, for example by means of a plug-in or snap-in connection, which due to the fact that during the tightening process of the Loosen the rope on the protective tube against the fixed holding element and the defined sealing forces.
  • the protective tube is preferably designed with its inner diameter such that the pull cable can be pulled through the protective tube during its installation, while the pull cable applies force to the protective tube during a tightening process, so that it stretches along the tear-off connections from that in the tensioning device Seal and the set in the tensioning device sealing element can solve.
  • At least one elevation is formed on an inner side of the protective tube facing the traction cable, which at least during the tightening process is in contact with the traction cable.
  • the elevation may be, for example, a circumferential projection extending in the circumferential direction. Alternatively, however, several elevations may be arranged in the circumferential direction one behind the other. The elevations can also be distributed in the axial direction of the protective tube. The elevations ensure that the pull cable can be guided by the sealing device during assembly and that a greater force acts on the protective tube during the tightening process than on the seal and / or the retaining element.
  • the seal and / or the sealing element may comprise an annular portion which is pressed radially outwardly during the tightening process by the pressurized gas of the ignited gas generator.
  • the annular portion is in particular cylindrical in sections and made of an elastic material and is pressed by the pressurized gas against the wall of the pressure chamber or the tensioner tube.
  • the seal is formed as a cylindrical collar and is fixed by means of press fit in the pressure chamber.
  • the sealing element is arranged in particular in the mounted state so that it seals a region in which the deflection block with the tensioner tube is connected, wherein without sealing element gas leakage in this area would be possible.
  • the sealing device In order to fix the sealing device with a deflection-side end on the deflection block, it can be provided that the sealing device is latched into the deflection block with one end. At the sealing device corresponding hooks or the like are thus formed in the region of the cable deflection, which can engage in corresponding recesses in the deflection block.
  • the deflecting block has an outwardly continuous recess, by means of which the engagement of the sealing device in the deflecting block can be recognized.
  • sealing device In order to fix the sealing device after assembly, provision may also be made for the sealing device to be fixed to the deflection block or the tensioning tube connected thereto by means of a form-fitting design comprising an end facing away from the retaining element and facing away from the cable deflection.
  • FIG. 4 shows a detailed view of a sealing device in the deflection-side region of a pressure chamber
  • FIG. 8 shows a detailed view of yet another embodiment of the tensioning device in longitudinal section
  • FIG. 9 a cross section through the embodiment of FIG. 8.
  • the tensioning device 1 shown in FIGS. 1 to 3 comprises a deflecting block 3, in which a cable deflection 4 and a pressure chamber 5 as well as a receptacle 6 fluidly connected to the pressure chamber are designed for a gas generator.
  • a tensioner tube 10 is connected, in which a piston 2 is arranged, which is coupled to a pull rope 7, which extends from the piston 2 through the pressure chamber 5 to the cable guide 4 and out of the Umlenkblock 3 out.
  • the pull cable 7 is connected to a seat belt component at the end (not shown).
  • the sealing device 13 comprises a seal 9, which seals the pressure chamber 5 at a deflection-side end 8, a protective tube 1 1 surrounding the tension cable 7 and a holding element designed as a sealing element 12, which seals a seal in the transition region from the deflection block 3 into the Tightening pipe 10 trains.
  • the sealing device 13 comprises tear-off connections 14 between the seal 9 and the protective tube 11 as well as between the protective tube 11 and the sealing element 12.
  • the seal 9 comprises an annular section 15, which is pressed radially outwardly against the wall of the pressure chamber 5 by the compressed gas generated by the gas generator in the event of a tripping.
  • the sealing device 13 is locked at one end to the deflection block 3.
  • the sealing device 13 is first introduced integrally into the pressure chamber 5 as a one-piece component and fixed there by the deflection-side latching connection and aligned concentrically to the pressure chamber 5 on the side of the tensioner tube 10 by the sealing element 12.
  • the pulling cable 7 is guided through the sealing device 13 and thus through the pressure chamber 5.
  • the gas generated by the gas generator drives the piston 2 in the illustration of FIG. 1 to the right, whereby the pull cable 7 is pulled through the pressure chamber 5 and thus through the sealing device 13. Due to the friction occurring between the traction cable 7 and the protective tube 11 extending along the traction cable 7, the sealing device 13 is acted on by a force in the direction of movement of the traction cable 7. If the force acting on the protective tube 1 1 exceeds a critical value with respect to the sealing element 12 fixed in the tensioning device 1 and the seal 9 fixed in the tensioning device 1, the tear-off connections 14 of the twisting device 13 are released, so that the Protective tube 1 1 can be moved with the pull cable 7 and the seal 9 and the sealing element 12 remain at the sealed points.
  • the protective tube 11 thus protects the traction cable 7 from the hot gas in the initial gas generation phase, while after the solution of the tear-off connections 14 the seal 9 and the sealing element 12 are no longer with a force acting against the seal 9 and the sealing element 12 against their determinations applied.
  • FIGS. 5 and 6 the tensioning device 1 is shown after a tightening process, wherein it can be seen that the seal 9 and the sealing element 12 remain at the points to be sealed, while the protective tube 11 moves with that of the piston 2 Pulling cable 7 has moved.
  • the sealing device 13 is formed in one piece and the tear-off 14 are formed by a material weakening in the one-piece sealing device 13, the sealing device 13 is formed in several parts according to the embodiment shown in Fig. 7.
  • the sealing element 12 is attached in a form-fitting manner to the protective tube 1 1 with legs protruding into the pressure chamber 5, wherein the positive-locking connection can be released during the tightening process.
  • FIGS. 8 and 9 show elements of a further embodiment of the tensioning device 1.
  • the seal 9 is formed as a cylindrical collar, which is fixed in the pressure chamber 5 by means of a press fit.
  • the tear-off connection 14 is designed as a material weakening between the seal 9 and the protective tube 11.
  • bulges 16 are formed on an inner side of the part 9 of the sealing device belonging to the seal 9, which hold the sealing device 1 on the pull rope 7 and which improve the sealing of the pressure chamber 5 during the initial ignition of the gas generator.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automotive Seat Belt Assembly (AREA)

Abstract

A tensioning device (1) for a seat belt, with a tensioner tube (10) for receiving (6) and guiding a piston (2) driven by compressed gas, a deflecting block (3) which is connected to the tensioner tube (10), forms a cable deflection (4) and in which a pressure chamber (5) adjoining the cable deflection (4) and a receptacle (6) for a gas generator are formed, and with a tension cable (7) which is connected to the piston (2), is connectable to a seat belt component to be set into a tensioning movement and enters the pressure chamber (5) from the cable deflection (4) and runs through the pressure chamber (5), wherein a seal (9) enclosing the tension cable (7) is arranged at a deflection-side end (8) of the pressure chamber (5) for sealing (9) the pressure chamber (5), and wherein the tension cable (7) is surrounded within the pressure chamber (5) by a protective tube (11), wherein tear-off connections (14) are formed between the seal (9) and the protective tube (11) and between the protective tube (11) and the holding element (12), along which tear-off connections the sealing device (13) can be destroyed during a tensioning operation, and therefore the protective tube (11) can be carried along by the tension cable (7) which is moved by the piston (2) during the tensioning operation, and the seal (9) and the holding element (12) remain at their installation locations.

Description

Straffvorrichtung mit Dichtungsvorrichtung  Tension device with sealing device
Beschreibung description
Die vorliegende Erfindung betrifft eine Straffvorrichtung für einen Sicher- heitsgurt mit einem Strafferrohr zur Aufnahme und Führung eines druckgas- getriebenen Kolbens, einem mit dem Strafferrohr verbundenen, eine Seilum- lenkung ausbildenden Umlenkblock, in dem eine sich an die Seilumlenkung anschließende Druckkammer und eine Aufnahme für einen Gasgenerator aus- gebildet sind, sowie mit einem an dem Kolben angeschlossenen Zugseil, welches mit einer in eine Straffbewegung zu versetzenden Sicherheitsgurt- komponente verbindbar ist und von der Seilumlenkung in die Druckkammer eintritt und durch die Druckkammer verläuft, wobei zur Abdichtung der Druckkammer an einem umlenkungsseitigen Ende der Druckkammer eine das Zugseil umschließende Dichtung angeordnet ist und wobei das Zugseil inner- halb der Druckkammer von einem Schutzrohr umgeben ist. The present invention relates to a tensioning device for a safety belt with a tightening tube for receiving and guiding a compressed-gas-driven piston, a connected to the tensioner tube, a Seilum- steering forming deflecting block in which an adjoining the rope deflection pressure chamber and a receptacle for a gas generator are formed, as well as with a tension cable connected to the piston, which is connectable with a seat belt to be offset in a tensioning movement and enters from the cable deflection in the pressure chamber and passes through the pressure chamber, wherein for sealing the pressure chamber at a The deflection-side end of the pressure chamber is arranged a seal enclosing the traction cable and wherein the traction cable within the pressure chamber is surrounded by a protective tube.
Eine Straffvorrichtung mit den vorgenannten Merkmalen ist aus EP 2 082 926 Bl bekannt, wobei die Dichtung und das Schutzrohr von einem einteiligen Bauelement ausgebildet sind. Um zu verhindern, dass das einteilige Bauele- ment während eines Straffvorganges mit dem durch den Kolben bewegten Seil mitgenommen wird, ist das einteilige Bauelement mittels eines Rückhal- terings in der Druckkammer festgelegt. Durch den Rückhaltering ist die Mon- tage des einteiligen Dichtelements erschwert, da der Dichtungsring im Tiefs- ten der von der offenen Seite des Umlenkungsblocks her zugängigen Druck- kammer platziert werden muss. Gleichzeitig muss gewährleistet werden, dass das Schutzrohr des einteiligen Dichtelements konzentrisch in der Druckkam- mer ausgerichtet ist, da anschließend das Zugseil durch das Schutzrohr mon- tiert werden muss. Aufgabe der vorliegenden Erfindung ist es daher, die mit Bezug zum Stand der Technik geschilderten Probleme zumindest teilweise zu lösen und insbe- sondere eine Straffvorrichtung anzugeben, die einfacher zu montieren ist und bei der während des Straffvorgangs gleichzeitig eine Kraftübertragung auf die Dichtung durch das Schutzrohr verringert ist. A tensioning device with the aforementioned features is known from EP 2 082 926 B1, wherein the seal and the protective tube are formed by a one-piece component. In order to prevent that the one-piece component is entrained during a tightening process with the rope moved by the piston, the one-piece component is fixed by means of a retaining ring in the pressure chamber. The retaining ring makes it difficult to install the one-piece sealing element, since the sealing ring must be placed in the lowest of the pressure chamber accessible from the open side of the deflection block. At the same time, it must be ensured that the protective tube of the one-piece sealing element is aligned concentrically in the pressure chamber, since subsequently the pull rope must be mounted through the protective tube. The object of the present invention is therefore to at least partially solve the problems described with reference to the prior art and, in particular, to provide a tensioning device which is easier to assemble and at the same time reduces force transmission to the seal through the protective tube during the tightening process is.
Gelöst wird diese Aufgabe durch eine Straffvorrichtung mit den Merkmalen des unabhängigen Anspruchs. Vorteilhafte Weiterbildungen der Straffvorrich- tung sind in den abhängigen Ansprüchen und in der Beschreibung angegeben, wobei Merkmale der vorteilhaften Weiterbildungen in technologisch sinnvol- ler Weise beliebig miteinander kombinierbar sind. This object is achieved by a tensioning device with the features of the independent claim. Advantageous developments of the tensioning device are specified in the dependent claims and in the description, wherein features of the advantageous developments can be combined with one another in a technologically meaningful manner.
Die Aufgabe wird insbesondere durch eine Straffvorrichtung mit den eingangs genannten Merkmalen gelöst, wobei die Dichtung, das Schutzrohr und ein das Schutzrohr in einem Übergangsbereich von dem Umlenkblock in das Straffer- rohr zentrierendes Halteelement als eine Dichtungsvorrichtung in die Druck- kammer eingesetzt sind, wobei zwischen der Dichtung und dem Schutzrohr sowie zwischen dem Schutzrohr und dem Halteelement Abreißverbindungen ausgebildet sind, entlang welcher die Dichtungsvorrichtung während eines Straffvorgangs zerstörbar ist, so dass das Schutzrohr von dem während des Straffvorgangs von dem Kolben bewegten Zugseil mitnehmbar ist und die Dichtung und das Halteelement an ihren Montagestellen verbleiben. The object is achieved in particular by a tensioning device with the features mentioned in the introduction, wherein the seal, the protective tube and a retaining element centering the protective tube in a transition region from the deflection block into the tension tube are inserted into the pressure chamber as a sealing device, wherein between The seal and the protective tube and between the protective tube and the holding element tear-off are formed along which the sealing device is destructible during a tightening process, so that the protective tube of the moving during the tensioning process of the piston pull rope is entrained and the seal and the retaining element at their Mounting points remain.
Insbesondere ist das Halteelement ein die Druckkammer in dem Übergangsbe- reich von dem Umlenkblock in das Strafferrohr abdichtendes Dichtelement. In particular, the holding element is a sealing element sealing the pressure chamber in the transition region from the deflection block into the tensioner tube.
Es ist also vorgesehen, dass die Dichtung, das Schutzrohr und das insbesonde- re als Dichtelement ausgestaltete Halteelement zur Montage als Dichtungsvor- richtung bezeichnete(s) Baugruppe oder Bauelement in den Umlenkblock ein- setzbar sind. Um die während des Straffvorgangs durch die Bewegung des Seils verursachte, auf das Halteelement und die Dichtung wirkende Kraft zu minimieren, löst sich das Schutzrohr, auf welches durch das Zugseil die größ- ten Kräfte während des Straffvorgangs wirken, von dem insbesondere kraft- und/oder formschlüssig in der Straffvorrichtung festgelegten Halteelement und der insbesondere kraft- und/oder formschlüssig in der Straffvorrichtung festgelegten Dichtung entlang der Abreißverbindung. Somit wird erreicht, dass das Schutzrohr während der Zündung des Gasgenerators und kurz danach zunächst das Zugseil gegen die austretenden heißen Gase schützt, in dem dann folgenden Straffvorgang nach dem Lösen der Abreißverbindungen allerdings nicht dichtungsmindernd auf die Dichtung wirkt. Nach dem Lösen der Ab- reißverbindungen überträgt das Schutzrohr also keine Kraft mehr auf die Dichtung, welche die Dichtung aus ihren Festlegungen lösen könnte. Zugleich ist aber eine einfache Montage der Dichtungsvorrichtung möglich, wobei das Halteelement das Schutzrohr an dem dem Strafferrohr zugewandten Ende der Druckkammer zentriert. It is therefore provided that the seal, the protective tube and the holding element designed in particular as a sealing element can be inserted into the deflection block for mounting as a sealing device or assembly. In order to minimize the force acting on the retaining element and the seal during the tightening process by the movement of the rope, the protective tube on which the pulling rope acts the largest forces during the tightening process, from which in particular force and / or form-fitting in the tensioning device fixed holding element and the particular force and / or positive locking in the tensioning device seal along the tear-off. Thus, it is ensured that the protective tube during the ignition of the gas generator and shortly thereafter initially protects the pull cable against the escaping hot gases, in which then following tightening process after releasing the Abreißverbindungen does not reduce the density on the seal acts. After loosening the tear-off connections, the protective tube thus no longer transfers any force to the seal, which could release the seal from its specifications. At the same time, however, a simple assembly of the sealing device is possible, wherein the holding element centers the protective tube on the tensioner tube facing the end of the pressure chamber.
Wenn das Halteement als Dichtelement ausgeführt ist, so verbleibt das Dich- telement nach dem Lösen der Abreißverbindung in seiner die Druckkammer im Übergangsbereich zu dem Strafferrohr abdichtenden Stellung. If the retaining element is designed as a sealing element, then the sealing element remains in its position sealing the pressure chamber in the transition region to the tensioner tube after the detachment of the tear-off connection.
In einer bevorzugten Ausführungsform der Straffvorrichtung ist die Dich- tungsvorrichtung einteilig ausgebildet und die Abreißverbindungen sind als Sollbruchstellen ausgebildet. Somit kann die Dichtungsvorrichtung als ein einteiliges Bauteil hergestellt werden, welches beispielsweise mit einem Spritzwerkzeug hergestellt werden kann. Bevorzugt ist dann, dass die eintei- lige Dichtungsvorrichtung in einem Mehrkomponentenspritzgussverfahren hergestellt ist, bei welchem die Dichtung und das Dichtelement aus einem an- deren Material gebildet sind als das Schutzrohr. In a preferred embodiment of the tensioning device, the sealing device is formed in one piece and the tear-off connections are designed as predetermined breaking points. Thus, the sealing device can be manufactured as a one-piece component, which can be produced for example with an injection molding tool. It is then preferred that the one-piece sealing device is produced in a multi-component injection molding process, in which the seal and the sealing element are formed from a different material than the protective tube.
Alternativ kann vorgesehen sein, dass die Dichtungsvorrichtung aus mehreren Teilen zu einer Baugruppe vor deren Montage in dem Umlenkblock zusam- mengesetzt wird. Somit können die Dichtung, das Halteelement oder Dich- telement und das Schutzrohr optimal für ihre jeweiligen Anforderungen aus- gelegt werden. Das Halteelement, die Dichtung und das Schutzrohr sind in diesem Fall beispielsweise durch eine Steck- oder Rastverbindung miteinan- der verbunden, welche sich aufgrund der während des Straffvorgangs von dem Seil auf das Schutzrohr entgegen dem festgelegten Halteelement und der fest- gelegten Dichtung wirkenden Kräfte lösen. Insbesondere ist das Schutzrohr bevorzugt mit seinem Innendurchmesser so ausgelegt, dass das Zugseil wäh- rend dessen Montage durch das Schutzrohr ziehbar ist, während das Zugseil das Schutzrohr während eines Straffvorganges mit Kraft beaufschlagt, so dass es sich entlang der Abreißverbindungen von dem in der Straffvorrichtung festgelegten Dichtung und dem in der Straffvorrichtung festgelegten Dich- telement lösen kann. Alternatively it can be provided that the sealing device is assembled from several parts to form a module before it is mounted in the deflection block. Thus, the seal, the holding element or the sealing element and the protective tube can be optimally designed for their respective requirements. In this case, the holding element, the seal and the protective tube are connected to one another, for example by means of a plug-in or snap-in connection, which due to the fact that during the tightening process of the Loosen the rope on the protective tube against the fixed holding element and the defined sealing forces. In particular, the protective tube is preferably designed with its inner diameter such that the pull cable can be pulled through the protective tube during its installation, while the pull cable applies force to the protective tube during a tightening process, so that it stretches along the tear-off connections from that in the tensioning device Seal and the set in the tensioning device sealing element can solve.
Insbesondere kann vorgesehen sein, dass auf einer dem Zugseil zugewandten Innenseite des Schutzrohres zumindest eine Erhebung ausgebildet ist, die zu- mindest während des Straffvorganges in Anlage mit dem Zugseil ist. Die Er- hebung kann beispielsweise ein in Umfangsrichtung verlaufender durchge- hender Vorsprung sein. Alternativ können aber auch mehrere Erhebungen in Umfangsrichtung hintereinander angeordnet sein. Die Erhebungen können auch in axialer Richtung des Schutzrohres verteilt angeordnet sein. Die Erhe- bungen sorgen dafür, dass das Zugseil während der Montage durch die Dich- tungsvorrichtung führbar ist und während des Straffvorganges eine größere Kraft auf das Schutzrohr wirkt als auf die Dichtung und/oder das Halteele- ment. In particular, it can be provided that at least one elevation is formed on an inner side of the protective tube facing the traction cable, which at least during the tightening process is in contact with the traction cable. The elevation may be, for example, a circumferential projection extending in the circumferential direction. Alternatively, however, several elevations may be arranged in the circumferential direction one behind the other. The elevations can also be distributed in the axial direction of the protective tube. The elevations ensure that the pull cable can be guided by the sealing device during assembly and that a greater force acts on the protective tube during the tightening process than on the seal and / or the retaining element.
Die Dichtung und/oder das Dichtelement können einen ringförmigen Ab- schnitt umfassen, der während des Straffvorgangs von dem Druckgas des ge- zündeten Gasgenerators radial nach außen gepresst wird. Der ringförmige Ab- schnitt ist insbesondere abschnittsweise zylinderförmig ausgebildet und aus einem elastischen Material und wird durch das Druckgas gegen die Wandung der Druckkammer oder des Strafferrohrs gedrückt. The seal and / or the sealing element may comprise an annular portion which is pressed radially outwardly during the tightening process by the pressurized gas of the ignited gas generator. The annular portion is in particular cylindrical in sections and made of an elastic material and is pressed by the pressurized gas against the wall of the pressure chamber or the tensioner tube.
Alternativ kann vorgesehen sein, dass die Dichtung als zylindrischer Bund ausgebildet ist und mittels Presspassung in der Druckkammer festgelegt ist. Das Dichtelement ist insbesondere im montierten Zustand so angeordnet, dass es einen Bereich abdichtet, in welchem der Umlenkblock mit dem Strafferrohr verbunden ist, wobei ohne Dichtelement eine Gasentweichung in diesem Be- reich möglich wäre. Alternatively it can be provided that the seal is formed as a cylindrical collar and is fixed by means of press fit in the pressure chamber. The sealing element is arranged in particular in the mounted state so that it seals a region in which the deflection block with the tensioner tube is connected, wherein without sealing element gas leakage in this area would be possible.
Um die Dichtungsvorrichtung mit einem umlenkungsseitigen Ende an dem Umlenkblock festzulegen, kann vorgesehen sein, dass die Dichtungsvorrich- tung mit einem Ende in den Umlenkblock eingerastet ist. An der Dichtungs- vorrichtung sind also im Bereich der Seilumlenkung entsprechende Haken oder ähnliches ausgebildet, die in entsprechenden Ausnehmungen in den Um- lenkblock einrasten können. In order to fix the sealing device with a deflection-side end on the deflection block, it can be provided that the sealing device is latched into the deflection block with one end. At the sealing device corresponding hooks or the like are thus formed in the region of the cable deflection, which can engage in corresponding recesses in the deflection block.
In diesem Zusammenhang kann insbesondere vorgesehen sein, dass der Um- lenkblock eine nach außen durchgängige Aussparung aufweist, durch welche das Einrasten der Dichtungsvorrichtung in dem Umlenkblock erkennbar ist. In this context, it can be provided, in particular, that the deflecting block has an outwardly continuous recess, by means of which the engagement of the sealing device in the deflecting block can be recognized.
Zur Festlegung der Dichtungsvorrichtung nach der Montage kann zudem vor- gesehen sein, dass die Dichtungsvorrichtung mit einem das Halteelement um- fassenden, der Seilumlenkung abgewandten Ende mittels einer Formschluss- gestaltung an dem Umlenkblock oder dem damit verbundenen Strafferrohr festgelegt ist. In order to fix the sealing device after assembly, provision may also be made for the sealing device to be fixed to the deflection block or the tensioning tube connected thereto by means of a form-fitting design comprising an end facing away from the retaining element and facing away from the cable deflection.
Die Erfindung sowie das technische Umfeld werden im Folgenden anhand der Figuren erläutert, wobei darauf hinzuweisen ist, dass die Figuren bevorzugte Ausführungsformen der Erfindung zeigen. Es zeigen schematisch The invention and the technical environment are explained below with reference to the figures, wherein it should be noted that the figures show preferred embodiments of the invention. It show schematically
Fig. 1 : eine Vorrichtung in einer Perspektivansicht, 1 shows a device in a perspective view,
Fig. 2: die Vorrichtung in Seitenansicht,  2 shows the device in side view,
Fig. 3 : eine Detailansicht der Straffvorrichtung,  3 is a detail view of the tensioning device,
Fig. 4: eine Detailansicht einer Dichtungsvorrichtung im umlenkungsseiti- gen Bereich einer Druckkammer,  4 shows a detailed view of a sealing device in the deflection-side region of a pressure chamber,
Fig. 5: die Straffvorrichtung nach einem Straffvorgang in Perspektivan- sicht,  5 shows the tensioning device after a tightening process in perspective view,
Fig. 6: die Straffvorrichtung nach dem Straffvorgang in einer weiteren An- sicht,  6 shows the tensioning device after the tightening process in a further view,
Fig. 7: eine Detailansicht einer weiteren Ausführungsform der Straffvor- richtung,  7 shows a detailed view of a further embodiment of the tensioning device,
Fig. 8: eine Detailansicht noch einer Ausführungsform der Straffvorrich- tung im Längsschnitt und  8 shows a detailed view of yet another embodiment of the tensioning device in longitudinal section and FIG
Fig. 9: ein Querschnitt durch die Ausführungsform der Fig. 8. 9: a cross section through the embodiment of FIG. 8.
Die in den Fig. 1 bis 3 dargestellte Straffvorrichtung 1 umfasst einen Um- lenkblock 3, in dem eine Seilumlenkung 4 und eine Druckkammer 5 sowie ei- ne mit der Druckkammer strömungstechnisch verbundene Aufnahme 6 für ei- nen Gasgenerator ausgebildet ist. Mit dem Umlenkblock 3 ist ein Strafferrohr 10 verbunden, in welchem ein Kolben 2 angeordnet ist, der mit einem Zugseil 7 gekoppelt ist, welches sich von dem Kolben 2 durch die Druckkammer 5 zu der Seilumlenkung 4 und aus dem Umlenkblock 3 heraus erstreckt. Das Zug- seil 7 ist an dem nicht dargestellten Ende mit einer Sicherheitsgurtkomponen- te verbunden. The tensioning device 1 shown in FIGS. 1 to 3 comprises a deflecting block 3, in which a cable deflection 4 and a pressure chamber 5 as well as a receptacle 6 fluidly connected to the pressure chamber are designed for a gas generator. With the Umlenkblock 3 a tensioner tube 10 is connected, in which a piston 2 is arranged, which is coupled to a pull rope 7, which extends from the piston 2 through the pressure chamber 5 to the cable guide 4 and out of the Umlenkblock 3 out. The pull cable 7 is connected to a seat belt component at the end (not shown).
Im Bereich der Druckkammer 5 ist über das Zugseil 7 eine Dichtungsvorrich- tung 13 geführt. Die Dichtungsvorrichtung 13 umfasst eine Dichtung 9, die die Druckkammer 5 an einem umlenkungsseitigen Ende 8 abdichtet, ein das Zugseil 7 umgebendes Schutzrohr 1 1 und ein als Dichtelement 12 ausgeführ- tes Halteelement, das eine Dichtung im Übergangsbereich von dem Umlenk- block 3 in das Strafferrohr 10 ausbildet. Die Dichtungsvorrichtung 13 umfasst Abreißverbindungen 14 zwischen der Dichtung 9 und dem Schutzrohr 11 so- wie zwischen dem Schutzrohr 1 1 und dem Dichtelement 12. Wie aus Fig. 3 und Fig. 4 zu erkennen ist, umfasst die Dichtung 9 einen ringförmigen Ab- schnitt 15, der durch das von dem Gasgenerator erzeugte Druckgas im Auslö- sefall radial nach außen gegen die Wandung der Druckkammer 5 gedrückt wird. Zudem ist zu erkennen, dass die Dichtungsvorrichtung 13 mit einem Ende mit dem Umlenkblock 3 verrastet ist. In the area of the pressure chamber 5, a sealing device 13 is guided via the pull cable 7. The sealing device 13 comprises a seal 9, which seals the pressure chamber 5 at a deflection-side end 8, a protective tube 1 1 surrounding the tension cable 7 and a holding element designed as a sealing element 12, which seals a seal in the transition region from the deflection block 3 into the Tightening pipe 10 trains. The sealing device 13 comprises tear-off connections 14 between the seal 9 and the protective tube 11 as well as between the protective tube 11 and the sealing element 12. As shown in FIG. 3 4, the seal 9 comprises an annular section 15, which is pressed radially outwardly against the wall of the pressure chamber 5 by the compressed gas generated by the gas generator in the event of a tripping. In addition, it can be seen that the sealing device 13 is locked at one end to the deflection block 3.
Zur Montage der Straffvorrichtung 1 wird also zunächst die Dichtungsvor- richtung 13 als einteiliges Bauteil zusammenhängend in die Druckkammer 5 eingeführt und dort durch die umlenkungsseitige Rastverbindung festgelegt und auf der Seite des Strafferrohres 10 durch das Dichtelement 12 konzent- risch zu der Druckkammer 5 ausgerichtet. Im Folgenden wird das Zugseil 7 durch die Dichtungsvorrichtung 13 und damit durch die Druckkammer 5 hin- durchgeführt. For assembly of the tensioning device 1, therefore, the sealing device 13 is first introduced integrally into the pressure chamber 5 as a one-piece component and fixed there by the deflection-side latching connection and aligned concentrically to the pressure chamber 5 on the side of the tensioner tube 10 by the sealing element 12. In the following, the pulling cable 7 is guided through the sealing device 13 and thus through the pressure chamber 5.
Im Auslösefall treibt das von dem Gasgenerator erzeugte Gas den Kolben 2 in der Darstellung gemäß Fig. 1 nach rechts, wodurch das Zugseil 7 durch die Druckkammer 5 und somit durch die Dichtungsvorrichtung 13 gezogen wird. Aufgrund der zwischen dem Zugseil 7 und dem sich entlang des Zugseils 7 erstreckenden Schutzrohrs 11 auftretenden Reibung wird die Dichtungsvor- richtung 13 mit einer Kraft in Richtung der Bewegungsrichtung des Zugseils 7 beaufschlagt. Wenn die auf das Schutzrohr 1 1 wirkende Kraft einen kriti- schen Wert gegenüber dem in der Straffvorrichtung 1 festgelegten Dichtele- ment 12 und der in der Straffvorrichtung 1 festgelegten Dichtung 9 übersteigt, lösen sich die Abreißverbindungen 14 der Di chtungs Vorrichtung 13, so dass das Schutzrohr 1 1 mit dem Zugseil 7 mitbewegt werden kann und die Dich- tung 9 und das Dichtelement 12 an den abzudichtenden Stellen verbleiben. Das Schutzrohr 11 schützt somit in der initialen Gaserzeugungsphase das Zugseil 7 vor dem heißen Gas, während es nach der Lösung der Abreißverbin- dungen 14 die Dichtung 9 und das Dichtelement 12 nicht mehr mit einer die Dichtung 9 und das Dichtelement 12 gegen ihre Festlegungen wirkende Kraft beaufschlagt. In den Fig. 5 und 6 ist die Straffvorrichtung 1 nach einem Straffvorgang dar- gestellt, wobei zu erkennen ist, dass die Dichtung 9 und das Dichtelement 12 an den abzudichtenden Stellen verblieben ist, während sich das Schutzrohr 11 mit dem von dem Kolben 2 bewegte Zugseil 7 mitbewegt hat. When triggered, the gas generated by the gas generator drives the piston 2 in the illustration of FIG. 1 to the right, whereby the pull cable 7 is pulled through the pressure chamber 5 and thus through the sealing device 13. Due to the friction occurring between the traction cable 7 and the protective tube 11 extending along the traction cable 7, the sealing device 13 is acted on by a force in the direction of movement of the traction cable 7. If the force acting on the protective tube 1 1 exceeds a critical value with respect to the sealing element 12 fixed in the tensioning device 1 and the seal 9 fixed in the tensioning device 1, the tear-off connections 14 of the twisting device 13 are released, so that the Protective tube 1 1 can be moved with the pull cable 7 and the seal 9 and the sealing element 12 remain at the sealed points. The protective tube 11 thus protects the traction cable 7 from the hot gas in the initial gas generation phase, while after the solution of the tear-off connections 14 the seal 9 and the sealing element 12 are no longer with a force acting against the seal 9 and the sealing element 12 against their determinations applied. In FIGS. 5 and 6, the tensioning device 1 is shown after a tightening process, wherein it can be seen that the seal 9 and the sealing element 12 remain at the points to be sealed, while the protective tube 11 moves with that of the piston 2 Pulling cable 7 has moved.
Während in der zuvor beschriebenen Ausführungsform die Dichtungsvorrich- tung 13 einteilig ausgebildet ist und die Abreißverbindungen 14 durch eine Materialschwächung in der einteiligen Dichtungsvorrichtung 13 ausgebildet sind, ist die Dichtungsvorrichtung 13 gemäß der in Fig. 7 dargestellten Aus- führungsform mehrteilig gebildet. Das Dichtelement 12 ist mit in die Druck- kammer 5 ragenden Schenkeln an das Schutzrohr 1 1 formschlüssig ange- bracht, wobei die formschlüssige Verbindung während des Straffvorganges lösbar ist. While in the embodiment described above, the sealing device 13 is formed in one piece and the tear-off 14 are formed by a material weakening in the one-piece sealing device 13, the sealing device 13 is formed in several parts according to the embodiment shown in Fig. 7. The sealing element 12 is attached in a form-fitting manner to the protective tube 1 1 with legs protruding into the pressure chamber 5, wherein the positive-locking connection can be released during the tightening process.
In den Figuren 8 und 9 sind Elemente einer weiteren Ausführungsform der Straffvorrichtung 1 dargestellt. So ist bei dieser Ausführungsform die Dich- tung 9 als ein zylindrischer Bund ausgebildet, der mittels Presspassung in der Druckkammer 5 festgelegt ist. Die Abreißverbindung 14 ist als eine Material- schwächung zwischen der Dichtung 9 und dem Schutzrohr 11 ausgebildet. FIGS. 8 and 9 show elements of a further embodiment of the tensioning device 1. Thus, in this embodiment, the seal 9 is formed as a cylindrical collar, which is fixed in the pressure chamber 5 by means of a press fit. The tear-off connection 14 is designed as a material weakening between the seal 9 and the protective tube 11.
Zudem sind auf einer Innenseite des der Dichtung 9 zugehörigen Teils der Dichtungsvorrichtung 13 Auswölbungen 16 ausgebildet, die die Dichtungsvor- richtung 1 auf dem Zugseil 7 halten und die während der initialen Zündung des Gasgenerators die Abdichtung der Druckkammer 5 verbessern. In addition, bulges 16 are formed on an inner side of the part 9 of the sealing device belonging to the seal 9, which hold the sealing device 1 on the pull rope 7 and which improve the sealing of the pressure chamber 5 during the initial ignition of the gas generator.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
1 Straffvorrichtung 1 tensioning device
2 Kolben  2 pistons
3 Umlenkblock  3 diverter block
4 Seilumlenkung  4 rope deflection
5 Druckkammer  5 pressure chamber
6 Aufnahme  6 recording
7 Zugseil  7 pull rope
8 umlenkungsseitiges Ende  8 turn-side end
9 Dichtung  9 seal
10 Strafferrohr  10 penalty tubes
11 Schutzrohr  11 protective tube
12 Dichtelement  12 sealing element
13 Dichtungsvorrichtung  13 sealing device
14 Abreißverbindung  14 tear-off connection
15 ringförmiger Abschnitt  15 annular section
16 Auswölbung  16 bulge

Claims

Ansprüche claims
1. Straffvorrichtung (1) für einen Sicherheitsgurt mit einem Strafferrohr1. Tension device (1) for a safety belt with a tightening tube
(10) zur Aufnahme (6) und Führung eines druckgasgetriebenen Kol- bens (2), einem mit dem Strafferrohr (10) verbundenen, eine Seilum- lenkung (4) ausbildenden Umlenkblock (3), in dem eine sich an die Seilumlenkung (4) anschließende Druckkammer (5) und eine Aufnah- me (6) für einen Gasgenerator ausgebildet sind, sowie mit einem an dem Kolben (2) angeschlossenen Zugseil (7), welches mit einer in eine Straffbewegung zu versetzenden Sicherheitsgurtkomponente verbind- bar ist und von der Seilumlenkung (4) in die Druckkammer (5) eintritt und durch die Druckkammer (5) verläuft, wobei zur Abdichtung (9) der Druckkammer (5) an einem umlenkungsseitigen Ende (8) der Druckkammer (5) eine das Zugseil (7) umschließende Dichtung (9) angeordnet ist und wobei das Zugseil (7) innerhalb der Druckkammer (5) von einem Schutzrohr (11) umgeben ist, dadurch gekennzeichnet, dass die Dichtung (9), das Schutzrohr (1 1) und ein das Schutzrohr (11) in einem Übergangsbereich von dem Umlenkblock (3) in das Straffer- rohr (10) zentrierendes Halteelement (12) als eine Dichtungsvorrich- tung (13) in die Druckkammer (5) eingesetzt sind, wobei zwischen der Dichtung (9) und dem Schutzrohr (11) sowie zwischen dem Schutzrohr(10) for receiving (6) and guiding a compressed-gas-driven piston (2), connected to the tensioner tube (10), forming a cable deflection (4) deflecting block (3), in which a to the cable deflection (4 ) and a receptacle (6) for a gas generator, as well as with a pull cable (7) connected to the piston (2), which can be connected to a seatbelt component to be tautened into a tightening movement and from the rope deflection (4) enters the pressure chamber (5) and passes through the pressure chamber (5), wherein for sealing (9) of the pressure chamber (5) at a deflection-side end (8) of the pressure chamber (5) a pull rope (7) enclosing seal (9) is arranged and wherein the pull rope (7) within the pressure chamber (5) by a protective tube (11) is surrounded, characterized in that the seal (9), the protective tube (1 1) and a protective tube ( 11) in a transition region of the Umlenkblock (3) in the Stra The holding tube (12) is inserted into the pressure chamber (5) as a sealing device (13), wherein between the seal (9) and the protective tube (11) and between the protective tube
(1 1) und dem Halteelement (12) Abreißverbindungen (14) ausgebildet sind, entlang welcher die Dichtungsvorrichtung (13) während eines Straffvorgangs zerstörbar ist, so dass das Schutzrohr (11) von dem während des Straffvorgangs von dem Kolben (2) bewegten Zugseil (7) mitnehmbar ist und die Dichtung (9) und das Halteelement (12) an ih- ren Montagestellen verbleiben. (1 1) and the holding element (12) tear-off (14) are formed, along which the sealing device (13) is destructible during a tightening process, so that the protective tube (11) of the during the tightening of the piston (2) moving pull rope (7) is entrainable and the seal (9) and the retaining element (12) remain at their mounting sites.
2. Straffvorrichtung nach Anspruch 1 , wobei das Halteelement ein die 2. Tightening device according to claim 1, wherein the holding element is a
Druckkammer (5) in den Übergangsbereich von dem Umlenkblock (3) in das Strafferrohr (10) abdichtendes Dichtelement (12) ist. Pressure chamber (5) in the transition region of the Umlenkblock (3) in the tensioner tube (10) sealing sealing element (12).
3. Straffvorrichtung (1 ), nach Anspruch 1 oder 2 wobei die Dichtungs- vorrichtung (13) einteilig ausgebildet ist und die Abreißverbindungen (14) als Sollbruchstellen ausgebildet sind. 3. Straffvorrichtung (1), according to claim 1 or 2 wherein the sealing device (13) is integrally formed and the Abreißverbindungen (14) are designed as predetermined breaking points.
4. Straffvorrichtung (1 ) nach einem der vorhergehenden Ansprüche, wo- bei die Dichtung (9) und/oder das Dichtelement (12) einen ringförmi- gen Abschnitt (15) umfasst, der während des Straffvorgangs von dem Druckgas des gezündeten Gasgenerators radial nach außen gepresst wird. 4. Tensioning device (1) according to any one of the preceding claims, wherein the seal (9) and / or the sealing element (12) comprises a ringförmi- gene section (15) radially during the tightening of the pressurized gas of the ignited gas generator pressed outside.
5. Straff Vorrichtung (1) nach einem der vorhergehenden Ansprüche, wo- bei die Dichtungsvorrichtung (13) mit einem dichtungsseitigen Ende in den Umlenkblock (3) eingerastet ist. 5. Taut device (1) according to any one of the preceding claims, wherein the sealing device (13) is locked with a seal-side end in the Umlenkblock (3).
6. Straffvorrichtung (1 ) nach einem der vorhergehenden Ansprüche, wo- bei die Dichtungsvorrichtung (13) mit einem das Halteelement (12) umfassenden, der Seilumlenkung (4) abgewandten Ende mittels einer Formschlussgestaltung an dem Umlenkblock (3) oder dem damit ver- bundenen Strafferrohr (10) festgelegt ist. 6. Straffvorrichtung (1) according to any one of the preceding claims, wherein the sealing device (13) with the holding element (12) comprehensive, the cable guide (4) facing away from the end by means of a form-locking design on the Umlenkblock (3) or the bound penalty tube (10).
7. Straffvorrichtung (1 ) nach einem der vorhergehenden Ansprüche, wo- bei auf einer dem Zugseil (7) zugewandten Innenseite des Schutzroh- res (11) zumindest eine Erhebung ausgebildet ist, die zumindest wäh- rend des Straffvorganges in Anlage mit dem Zugseil (7) ist. 7. Tensioning device (1) according to one of the preceding claims, wherein at least one elevation is formed on an inner side of the protective tube (11) facing the traction cable (7), at least during the tightening process in contact with the traction cable (11). 7) is.
PCT/EP2016/065768 2015-07-09 2016-07-05 Tensioning device with a sealing device WO2017005718A1 (en)

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EP3643568A1 (en) * 2018-10-26 2020-04-29 Autoliv Development AB Belt pretensioner for a seatbelt device
CN113103984A (en) * 2020-01-10 2021-07-13 均胜安全系统德国有限公司 Tensioning drive for a safety belt device and device having a tensioning drive
CN115432391A (en) * 2022-10-24 2022-12-06 唐山锐意聚机械设备有限公司 Special cantilever rubber belt conveyor
US11970129B2 (en) 2020-02-14 2024-04-30 Autoliv Development Ab Tensioning apparatus for a safety belt component

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DE102020103157B4 (en) 2020-02-07 2023-06-22 Autoliv Development Ab Tensioning device for a seat belt component
DE102020122985B4 (en) 2020-09-03 2022-07-14 Autoliv Development Ab Tensioning device for a seat belt component
DE102021100437A1 (en) 2021-01-12 2022-07-14 Autoliv Development Ab Tensioning device for a seat belt component

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DE102012110997B4 (en) 2012-11-15 2020-08-20 Autoliv Development Ab Pyrotechnic tensioning device with easy-to-assemble sealing unit

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Publication number Priority date Publication date Assignee Title
EP3643568A1 (en) * 2018-10-26 2020-04-29 Autoliv Development AB Belt pretensioner for a seatbelt device
CN113103984A (en) * 2020-01-10 2021-07-13 均胜安全系统德国有限公司 Tensioning drive for a safety belt device and device having a tensioning drive
US11970129B2 (en) 2020-02-14 2024-04-30 Autoliv Development Ab Tensioning apparatus for a safety belt component
CN115432391A (en) * 2022-10-24 2022-12-06 唐山锐意聚机械设备有限公司 Special cantilever rubber belt conveyor

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