Safety belt webbing

Abstract

The invention relates to a safety belt webbing (10) for a safety belt system of a motor vehicle, comprising a woven fabric (11) consisting of warp threads (12) and weft threads (13). The safety belt webbing (10) has, at least in some sections, a 3 / 3 twill weave, which is offset by two warp threads (12) per weft thread (13).

Description

[0001] The present invention relates to a seat belt webbing for a seat belt system of a motor vehicle, the seat belt webbing comprising a woven fabric composed of warp and weft yarns.

[0002] Seat belt webbing for motor vehicles typically consists of a woven fabric with a twill weave. The twill weave is usually a 2 / 2 twill weave, designed to be offset by two warp yarns every other weft. This results in a checkerboard pattern where a yarn alternately lies above and below two intersecting yarns in both the warp and weft directions.

[0003] Due to its restraining function for occupants, seat belt webbing must meet high tensile strength requirements. One problem with seat belt webbing is that it wears down during use, which reduces its tensile strength under wear. For example, wear can occur when seat belt webbing is deployed and retracted via a belt retractor or locking latch.

[0004] A seatbelt webbing with higher abrasion resistance is known from EP 2 659 039 B1, which has a 2 / 1 / 1 / 2 twill weave, wherein each weft yarn is offset by two warp yarns.

[0005] In addition, seat belt webbing comes into indirect contact with the occupant's body and skin, and in some cases even directly with the body and skin, particularly the lap belt portion around the occupant's abdomen.

[0006] The problem solved by this invention is to provide an alternative weave pattern for the fabric of a specified seat belt webbing, which has sufficient strength and high flexibility in use, so as to comfortably fasten the seat belt webbing.

[0007] This invention solves the problem through the features of the independent claims.

[0008] A seatbelt webbing for a seatbelt system of a motor vehicle is proposed, comprising a woven fabric composed of warp and weft yarns, and having at least some portions of a 3 / 3 twill weave in which each weft yarn is offset by two warp yarns.

[0009] The proposed seatbelt webbing exhibits exceptionally high flexibility across its width due to its 3 / 3 twill weave, resulting in fewer cross points compared to existing technologies. Cross points are points where yarns change direction between the top and bottom of a woven fabric. For example, fewer cross points are found compared to existing woven fabrics with 2 / 2 or 2 / 1 twill weaves or abrasion-resistant fabrics. However, the number of cross points in the warp direction remains constant. The proposed offset results in a 2-1-2-1 pattern in the warp direction, maintaining a high number of warp-direction cross points and thus ensuring high tensile strength even after heavy use. Therefore, the pattern along the warp yarns of the proposed seatbelt webbing is either a 2-1-2-1 or a 1-2-1-2 pattern. For example, after years of wear, the seatbelt webbing can retain 90% of its original breaking load.

[0010] Overall, the proposed seatbelt webbing has a balanced twill weave, with the warp and weft yarns visible in equal proportion on both sides of the woven fabric surface.

[0011] The seatbelt webbing preferably has a 3 / 3 twill weave, in which each weft yarn is offset by two warp yarns. This allows the advantageous characteristics to be fully utilized throughout the seatbelt webbing.

[0012] In another advantageous improvement, the seatbelt webbing is finished with edge yarn at the edges. Complex edge finishing of the seatbelt webbing can be easily accomplished using the suggested weaving pattern.

[0013] In an advantageous embodiment, the seatbelt webbing has a hook edge and a closing edge at the edge.

[0014] According to another improved form, it is proposed

[0015] The seat belt webbing has multiple strips along the warp direction, with two warp yarns in each strip offset to the left or right, and adjacent strips offset in different directions. The seat belt webbing preferably has five strips.

[0016] The invention will now be explained using preferred embodiments with reference to the accompanying drawings. In the drawings:

[0017] Figure 1 This is a view of the woven fabric pattern of the seatbelt webbing.

[0018] Figure 1 Details of the woven fabric 11 of the proposed seatbelt webbing 10 are shown. This detail of the woven fabric 11 of the seatbelt webbing 10 can also be referred to as a repeating section. The woven fabric 11 has... Figure 1 The vertically extending warp 12, shown in white, and in Figure 1The horizontally extending weft yarn 13 is shown in black. The weft yarn 13 extends in a 3 / 3 twill weave, so that it is alternately guided above and below the three warp yarns 12. The next weft yarn 13 is guided offset from two warp yarns 12, thus forming a distinctive twill line. Figure 1 In the exemplary embodiment shown, the twill line extends to the upper right, wherein the angle with the warp yarn 12 is less than 45°.

[0019] As from Figure 1 As can be seen in the repeating part, a 2-1-2-1 pattern is obtained along the vertically extending warp 12, which alternates with a 1-2-1-2 pattern with the next warp 12.

Claims

1. A seatbelt webbing (10) for a seatbelt system of a motor vehicle, the seatbelt webbing comprising a woven fabric (11) composed of warp yarns (12) and weft yarns (13), characterized in that The seatbelt webbing (10) has a 3 / 3 twill weave at least in some portions, wherein each weft yarn (13) of the twill weave is offset by two warp yarns (12).

2. The seat belt webbing (10) according to claim 1, characterized in that, The seat belt webbing (10) has a 3 / 3 twill weave, with each weft yarn (13) offset from two warp yarns (12).

3. The seat belt webbing (10) according to any one of claims 1 or 2, characterized in that, The seat belt webbing (10) is finished with edge yarn at the edge.

4. The seat belt webbing (10) according to any one of the preceding claims, characterized in that, The seat belt webbing (10) has a hook edge and a closing edge at the edge.

5. The seat belt webbing (10) according to any one of the preceding claims, characterized in that, The seat belt webbing (10) has multiple strips in the direction of the warp yarns (12), wherein two warp yarns (12) in the strips are offset to the left or to the right, and the offset directions of adjacent strips are different.

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