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EP-4735679-A1 - SEAT-BELT STRAP

EP4735679A1EP 4735679 A1EP4735679 A1EP 4735679A1EP-4735679-A1

Abstract

The invention relates to a seat-belt strap (10) for a seat-belt system of a motor vehicle, the seat-belt strap comprising a woven fabric (11) consisting of warp threads (12) and weft threads (13). The seat-belt strap (10) has, at least in some portions, a 3/3 twill weave with an off-set of two warp threads (12) with each weft thread (13).

Inventors

  • POOL, ANITA
  • VAN HELVOORT, CHRIS
  • WELZ, Willi
  • MUELLER, KAI-STEPHAN

Assignees

  • Autoliv Development AB

Dates

Publication Date
20260506
Application Date
20240603

Claims (5)

  1. 1. Seat belt webbing (10) for a seat belt system of a motor vehicle with a fabric (11) made of warp threads (12) and weft threads (13), characterized in that the seat belt webbing (10) has at least in sections a 3/3 twill weave which has an offset of two warp threads (12) with each weft thread (13).
  2. 2. Safety belt webbing (10) according to claim 1, characterized in that the safety belt webbing (10) completely has a 3/3 twill weave which has an offset of two warp threads (12) with each weft thread (13).
  3. 3. Safety belt webbing (10) according to claim 1 or 2, characterized in that the safety belt webbing (10) is finished at the edges with an edge yarn.
  4. 4. Safety belt webbing (10) according to one of the preceding claims, characterized in that the safety belt webbing (10) has catch and closure threads on the edges.
  5. 5. Safety belt webbing (10) according to one of the preceding claims, characterized in that the safety belt webbing (10) has a plurality of strips in the direction of the warp threads (12), wherein the offset of two warp threads (12) in the strips is to the left or to the right, and wherein adjacent strips have a differently directed offset.

Description

seat belt webbing The present invention relates to a seat belt webbing for a seat belt system of a motor vehicle with a fabric made of warp threads and weft threads. Seat belt webbing for motor vehicles usually has a fabric with a twill weave. The twill weave is often a 2/2 twill weave, which is made with an offset of two warp threads every other weft thread. This creates a kind of checkerboard pattern, and in both the direction of the warp threads and the direction of the weft threads, one thread is alternately above and below two crossing threads. Due to their restraining function for the occupant, seat belt straps have to meet high requirements in terms of tensile strength. The problem with seat belts is the wear and tear that occurs during operation, which can reduce the tensile strength when worn. The wear and tear can be caused, for example, by the seat belt strap unrolling and running in over the belt retractor or the belt tongue. From EP 2 659 039 Bl a safety belt with improved wear resistance is known which has a 2/1/1/2 twill weave having an offset of two warp threads with each weft thread. Furthermore, the seat belt webbing is in indirect contact with the body and skin of an occupant, sometimes even in direct contact with the body and skin, particularly in the lap belt section on the abdomen of an occupant. The object of the present invention is to provide an alternative binding of a fabric of a seat belt webbing, which enables sufficient strength in a used condition and at the same time a high flexibility for comfortable wearing of the seat belt. The invention solves the problem with the features of the independent claims. A seat belt webbing for a seat belt system of a motor vehicle with a fabric made of warp threads and weft threads is proposed, wherein the seat belt webbing has at least in sections a 3/3 twill weave which has an offset of two warp threads with each weft thread. The proposed seat belt webbing has a very high degree of flexibility due to the 3/3 twill weave across the width of the seat belt webbing, as there are fewer binding points across the width of the webbing compared to the prior art. Binding points are the points in the fabric where a thread alternates between the top and bottom of the fabric. The number of binding points is reduced, for example, compared to a fabric with a 2/2 or 2/1 twill weave or a wear-resistant fabric from the prior art. At the same time, however, the number of binding points in the warp direction is maintained. In the warp direction, the proposed offset results in a 2-1-2-1 pattern, so that the number of binding points in the warp direction of the fabric remains high, so that a high tensile strength of the seat belt webbing is maintained even after heavy use. The pattern along individual warp threads of the proposed seat belt webbing is therefore a 2-1-2-1 pattern or a 1-2-1-2 pattern. For example, 90% of the original breaking load of the seat belt webbing can be retained after years of wear. Overall, the proposed seat belt webbing has a balanced twill weave, with the warp threads visible on the surface in equal proportions as the weft threads on both sides of the fabric. Preferably, the seat belt webbing has a complete 3/3 twill weave, which has an offset of two warp threads with each weft thread. This enables the advantageous properties to be exploited across the entire seat belt webbing. According to an advantageous further development, the seat belt webbing is finished at the edges with an edge yarn. The seat belt webbing can easily be provided with complex edge finishes of the seat belt webbing using the proposed binding. In an advantageous embodiment, the seat belt webbing has catch and fastening threads on the edges. According to a further development, it is proposed that the seat belt webbing has a plurality of strips in the direction of the warp threads, wherein the offset of two warp threads in the strips is to the left or to the right, and wherein adjacent strips have a differently oriented offset. Preferably, the seat belt webbing has five strips. The invention is explained below using preferred embodiments with reference to the attached figures. Fig. 1 Representation of a fabric pattern of the seat belt webbing. Figure 1 shows a section of the fabric 11 of the proposed seat belt webbing 10. This section of the fabric 11 of the seat belt webbing 10 can also be referred to as a repeat. The fabric 11 has warp threads 12, which run vertically in Figure 1 and are shown in white, and weft threads 13, which run horizontally in Figure 1 and are shown in dark. The weft threads 13 run in the 3/3 twill weave such that the weft thread 13 is alternately guided over and under three warp threads 12. The next weft thread 12 is guided with an offset of two warp threads 12, so that a characteristic twill line is formed. In the embodiment of Figure 1, the twill line runs to the top right, with the angle to the warp threads 13 being less than 45°. As c