TENSIONING APPARATUS FOR A SAFETY BELT COMPONENT

Abstract

The present invention relates to a tensioning apparatus for a safety belt component and to a method for producing such a tensioning apparatus, comprising a gas generator for generating a pressurized gas, a piston which can be driven by the pressurized gas, a traction cable which is connected to the piston and can be connected to a safety belt component to be set into tensioning motion, and a tensioner tube for receiving and guiding the piston, wherein the gas generator is located in the tensioner tube, the tensioner tube has a cut-out in the jacket thereof between the gas generator and the piston, and a cable deflection is provided, by means of which the traction cable is guided through the cut-out and out of the tensioner tube.

Claims

1. A tensioning apparatus for a safety belt component, having a gas generator for generating a pressurized gas, a piston that can be driven by the pressurized gas, a traction cable connected to the piston, which traction cable can be connected to a safety belt component which is to be set into tensioning motion, and a tensioner tube for receiving and guiding the piston, wherein the gas generator is arranged in the tensioner tube, the tensioner tube has a cut-out in the jacket thereof between the gas generator and the piston, and a cable deflection is provided, by means of which the traction cable is guided through the cut-out and out of the tensioner tube.

2. The tensioning apparatus according to claim 1, wherein the cable deflector comprises a guide part inserted into the tensioner tube along the extension of the tensioner tube.

3. The tensioning apparatus according to claim 2, wherein the guide part has a receptacle and wherein the gas generator is arranged in the receptacle.

4. The tensioning apparatus according to claim 2, wherein the guide part has a deflection for the traction cable, wherein the deflection extends from the piston end of the guide part to the cut-out in the tensioner tube.

5. The tensioning apparatus according to claim 2, wherein the guide part forms at least one pressurized gas duct, wherein the pressurized gas duct extends along the extension of the tensioner tube to the piston end of the guide part.

6. The tensioning apparatus according to claim 1, wherein the cable deflector comprises a fixing part which engages in the cut-out of the tensioner tube from outside the tensioner tube, wherein in particular the traction cable is guided through the fixing part.

7. The tensioning apparatus according to claim 6, wherein the fixing part is held on the tensioner tube by a holder.

8. The tensioning apparatus according to claim 1, wherein the cable deflector is designed in two or more parts and has a guide part inserted into the tensioner tube and a fixing part which engages through the cut-out from the outside.

9. The tensioning apparatus according to claim 8, wherein the guide part has a cut-out into which the fixing part engages with a projection.

10. The tensioning apparatus according to claim 7, wherein the guide part and the fixing part form a deflection for the traction cable.

11. The tensioning apparatus according to claim 1, wherein the cut-out is arranged in a rectilinear portion of the tensioner tube.

12. The tensioning apparatus according to claim 1, wherein the tensioner tube is rectilinear over its entire extension.

13. A method for producing a tensioning apparatus, comprising the following steps: a) providing an in particular rectilinear tensioner tube having a cut-out in the jacket thereof, b) pre-assembling a gas generator in an element of a cable deflector, c) inserting the element of the cable deflector with the pre-assembled gas generator into the tensioner tube, d) fixing the cable deflector to the tensioner tube, e) introducing a traction cable into the tensioner tube, f) fastening a piston to the traction cable.

Description

[0023] The invention and the technical environment are explained below by way of example with reference to the figures. The following are shown schematically:

[0024] FIG. 1: a sectional view through the tensioning apparatus,

[0025] FIG. 2: an exploded view of the tensioning apparatus,

[0026] FIG. 3: a perspective view of a guide part of the tensioning apparatus,

[0027] FIG. 4: a sectional view through the guide part,

[0028] FIG. 5: a perspective view of a fixing part of the tensioning apparatus; and

[0029] FIG. 6: a sectional view through the fixing part.

[0030] The tensioning apparatus shown in FIGS. 1 and 2 comprises a tensioner tube 1 and a traction cable 8, with a piston 4 being attached to the end of the traction cable 8 arranged in the tensioner tube 1, which piston 4 is fastened to the traction cable 8 by means of a fastening 6, wherein balls 5 facilitate a low-friction guiding of the piston 4 in the tensioner tube 1. A cut-out 13 is formed in the jacket of the tensioner tube 1.

[0031] The tensioning apparatus also comprises a cable deflector 14, by means of which the traction cable 8 is guided through the cut-out 13 in the tensioner tube 1. The cable deflector 14 comprises a guide part 3, with a gas generator 2 being arranged in the receptacle 15 of the guide part 3 facing away from the piston 4. The cable deflector 14 also comprises a fixing part 9 which engages with a projection 19 through the cut-out 13 in the tensioner tube 1. The fixing part 9 is fastened to the tensioner tube 1 by means of a holder 7 via a rivet 11 and a screw 12, wherein the holder 7 encompasses the tensioner tube 1 on the outside.

[0032] As can be seen in particular from the combination of FIGS. 3 and 4, the guide part 3 has a receptacle 15 for the gas generator 2. In addition, the guide part 3 forms a plurality of pressurized gas ducts 17, which extend from the receiving side to the end of the guide part 3 which faces the piston 4.

[0033] The guide part 3 also forms a deflection 16, by means of which the traction cable 8 is fed to the cut-out 13 in the tensioner tube 1.

[0034] In addition, it can be seen from the combination of FIGS. 3 to 6 that the fixing part 9 has a projection 19, which, in the mounted state, engages in a recess 18 formed in the guide part 3.

[0035] In the event of tripping, the gas generator 2 generates pressurized gas which is guided along past the deflection 16 through the pressurized gas ducts 17, so that the hot pressurized gas does not directly pressurize the traction cable 8 in the region of the guide part 3. The guide part 3 is designed in such a way that pressurized gas can escape from the guide part 3 only along the pressurized gas ducts 17. The pressurized gas escaping the guide part 3 accelerates the piston 4 in the figures to the right, so that the traction cable 8 is pulled into the tensioner tube 1, wherein the cable deflection 14 prevents the traction cable 8 from coming directly into contact with the tensioner tube 1.

[0036] For simplified assembly, the gas generator 2 can first be introduced into the receptacle 15 of the guide part 3 and then inserted together with the guide part 3 into the tensioner tube 1. The guide part 3 is then fixed by means of the fixing part 9 in that the fixing part 9 with its projection 19 is introduced into the recess 18 of the guide part 3. The fixing part 9 is then fixed to the tensioner tube 1 by means of the holder 7. In addition, the traction cable 8 is introduced into the tensioner tube 1 through the cable deflector 14, wherein the piston 4 can be fixed beforehand or subsequently with the fastening 6.

LIST OF REFERENCE SIGNS

[0037] TABLE-US-00001 1 Tensioner tube 2 Gas generator 3 Guide part 4 Piston 5 Ball 6 Fastening 7 Holder 8 Traction cable 9 Fixing part 10 Washers 11 Rivet 12 Screw 13 Cut-out 14 Cable deflection 15 Receptacle 16 Deflector 17 Pressurized gas duct 18 Recess 19 Projection