TENSIONING DEVICE FOR A SEAT BELT COMPONENT

Abstract

A seat belt tensioning device with a gas generator for generating a compressed gas, a piston driven by the compressed gas, a tension cable which is connected to the piston and is connectable to a seat belt component to be set into a tensioning movement, a tensioner tube for receiving and guiding the piston, and a guide block that forms a cable guide and in which a receptacle receiving the gas generator and a pressure chamber connected in terms of flow to the receptacle are formed, wherein the guide block is connected to the tensioner tube, and the tension cable runs rectilinearly in a piston movement direction from the tensioner tube through the pressure chamber, wherein the guide block forms a linear guide adjoining the pressure chamber such that the tension cable can be led out of the guide block on the side opposite the tensioner tube.

Claims

1. A tensioning device for a seat belt component, with a gas generator for generating a compressed gas, a piston that can be driven by the compressed gas, a tension cable that is connected to the piston and is connectable to a seat belt component to be set into a tensioning movement, a tensioner tube for receiving and guiding the piston, and a guide block that forms a cable guide and in which a receptacle receiving the gas generator and a pressure chamber connected in terms of flow to the receptacle are formed, wherein the guide block is connected to the tensioner tube, and the tension cable runs rectilinearly in a piston movement direction from the tensioner tube through the pressure chamber, wherein the guide block forms a linear guide that adjoins the pressure chamber and is configured in such a manner that the tension cable can be led out of the guide block parallel to the piston movement direction on the side opposite the tensioner tube.

2. The tensioning device according to claim 1, wherein, in the linear guide, at least one resistance element is arranged, which counteracts an unintentional movement of the tension cable.

3. The tensioning device according to claim 2, wherein the at least one resistance element is formed by a component inserted into the linear guide.

4. The tensioning device according to claim 3, wherein the inserted component is made of plastic, and the resistance elements formed by the component are reduced at the beginning of a tensioning process due to friction.

5. The tensioning device according to claim 2, wherein the resistance element brings about an S-shaped guide of the tension cable and thus a parallel offset of the tension cable.

6. The tensioning device according to claim 1, characterized in that, in addition to the linear guide, a deflection guide is formed in the guide block, which is configured such that the tension cable can be led out of the guide block obliquely to the piston movement direction.

7. The tensioning device according to claim 3, wherein the component forming the resistance element is arranged both in the linear guide and in the deflection guide.

8. The tensioning device according to claim 6, wherein the component forming the resistance element is arranged both in the linear guide and in the deflection guide.

Description

[0013] The invention and the technical environment are explained below by way of example with reference to the figures. The following are shown schematically:

[0014] FIG. 1: a tensioning device,

[0015] FIG. 2: an independent component for forming a resistance element of the tensioning device according to FIG. 1, and

[0016] FIG. 3: a detailed illustration of an additional embodiment of a tensioning device.

[0017] The tensioning devices shown in FIGS. 1 and 3 in each case comprise a guide block 1 in which a receptacle 2 for a gas generator (not shown) is formed. The receptacle 2 is connected in terms of flow to a pressure chamber 3 formed in the guide block 1.

[0018] A tension cable 4 is guided rectilinearly through the pressure chamber 3 and into a tensioner tube 5. Within the tensioner tube 5, the tension cable 4 is connected to a piston (not shown). The arrangement of the piston on the tension cable and in the tensioner tube is already mentioned in DE 10 2015 111 083 B4 mentioned in the introduction, to which reference is made in this regard. However, the arrangement of the piston is also not important for the present invention.

[0019] When triggered, the gas generator generates a compressed gas that is guided through the pressure chamber 3 into the tensioner tube 5 and there drives the piston, and thus also the tension cable 4, in a piston movement direction 6.

[0020] On the side facing away from the tensioner tube 5, the guide block 1 is formed such that the tension cable 4 is guided in parallel alignment with (FIG. 1) or with a parallel offset (FIG. 3) out of the guide block 1. Thus, the guide block 1 has a linear guide 7. In addition, the guide block 1 also has a deflection guide 10, so that the tension cable 4 could also be guided out of the guide block 1 transversely to the piston movement direction 6 (not shown in the figures).

[0021] In order to prevent the tension cable 4 and thus the piston from being unintentionally moved prior to a tensioning process, a resistance element 8 is provided.

[0022] According to the embodiment of FIGS. 1 and 2, the resistance element 8 is formed by projections on an independent component 9. The independent component 9 is shaped such that it is arranged with a holding section in the deflection guide 10, and with the section having the resistance element 8 in the linear guide 7. At the beginning of a tensioning process triggered by the gas generator, the projections on the individual component 9 are reduced in height due to the friction with the tension cable 4, so that the friction or the resistance also decreases.

[0023] According to the embodiment of FIG. 3, the resistance element 8 is formed by a type of chicane, so that the tension cable 4 is deflected in an S-shaped manner, thereby providing resistance.

LIST OF REFERENCE SIGNS

[0024] 1 Guide block [0025] 2 Receptacle [0026] 3 Pressure chamber [0027] 4 Tension cable [0028] 5 Tensioner tube [0029] 6 Piston movement direction [0030] 7 Linear guide [0031] 8 Resistance element [0032] 9 Component [0033] 10 Deflection guide