Belt accessories for seat belt systems

Abstract

The invention relates to a belt fitting for a safety belt device, comprising a base section (13) and a plug tongue (9) protruding from the base section, wherein the base section (13) has a belt loop (15) having a belt-running surface (17) which, when the safety belt (5) is fastened, comes into sliding contact with a belt (5) guided through the belt loop (15), wherein the belt-running surface (17) transitions on both sides in the belt-transverse direction at lateral corner regions (19) into a belt-loop edge (21) lying opposite the belt-running surface (17), and wherein the belt-running surface (17) has a surface profile (35) which, under load, provides stable belt-transverse guidance in the belt loop (15) which counteracts a transverse load component (F) acting on the belt (5). y According to the invention, a displacement body (23) is constructed at the belt loop edge (21) opposite the belt running surface (17), which reduces the gap width of the belt loop (15). When viewed in the belt transverse direction, the displacement body (23) is separated from the corresponding lateral belt loop corner area (19) on both sides by the belt free space (25).

Description

Technical Field

[0001] The invention relates to a belt fitting for a seat belt arrangement in a vehicle. Background Art

[0002] A seat belt arrangement for a vehicle may have, for example, a lap belt section and a shoulder belt section extending diagonally across the upper body of the vehicle occupant. When the seat belt is fastened, the lap belt section is anchored to the vehicle body via two laterally opposite, lower attachment points. The attachment points located inward in the transverse direction of the vehicle are usually designed to be releasable, i.e., have a belt attachment arranged on the lap belt, the tongue of which can be inserted into a belt buckle anchored on the vehicle body side.

[0003] A belt accessory of this type is known from WO 2015 / 022214 A1. The belt accessory has a base section and a plug tongue protruding therefrom. The base section is configured with a belt loop ( Sometimes referred to as belt eyelets). When the safety belt is fastened, the belt running surface comes into sliding contact with the belt guided through the belt loop. In order to provide stable transverse belt guidance in the belt loop under load, the belt running surface has a correspondingly designed surface contour. Furthermore, in the transverse belt direction, the belt running surface transitions on both sides at lateral rounded corner regions into the belt loop edge lying opposite the belt running surface.

[0004] Under load, depending on the crash situation, excessive belt forces may act on the worn seat belt. In this case, in the belt fitting known from WO 2015 / 022214 A1, it is possible to cause a lateral displacement of the belt in the belt running surface up to the corner region of the belt loop. This results in very strong compressive stresses on the belt material in the belt loop corner region. The friction energy thus generated may possibly melt the plastic encapsulation (e.g. made of PP or PA) or belt filaments of the belt in the belt loop corner region. Summary of the invention

[0005] The object of the invention is to provide a belt fitting which, in contrast to the prior art, ensures perfect operational safety under load.

[0006] This object is achieved by the features described below.

[0007] According to the present invention, a displacement body is constructed on the belt loop edge opposite to the belt running surface. The belt loop cross section can be reduced by means of the displacement body. The displacement body serves as a spacer for the defined belt loop slit height in order to prevent the belt from turning over. For this purpose, the displacement body extends into the belt loop, i.e. the belt loop slit height is reduced. In the transverse direction of the belt, the displacement body is spaced apart from the corresponding rounded belt loop corner regions on both sides via free space. In the case of a transverse displacement of the belt under load, its edge can be moved into the belt loop free space without interfering with the contour, thereby reducing the extrusion stress of the belt edge, so that damage to the belt due to increased friction energy can be avoided.

[0008] In one technical implementation, a belt guide gap with a reduced through-cross section can be provided between the belt running surface and the displacement body formed at the opposite belt loop edge. The belt guide gap transitions on both sides in the belt transverse direction into a corresponding belt free space with an enlarged through-cross section. The corresponding lateral belt free space can be raised by a profile height from the belt guide gap in the direction of the insertion tongue.

[0009] In a first embodiment variant, the surface profile of the belt running surface can be designed concavely in the belt transverse direction. The concave surface profile can have a central profile base in the belt transverse direction, with profile flanks rising on both sides of the profile base to the running surface edge. The profile base can be set back by the profile depth relative to the running surface edge.

[0010] Alternatively, the surface profile of the belt-running surface can be convexly configured in the belt-transverse direction. In this case, the convex surface profile can have a centered profile vertex in the belt-transverse direction, and the profile flanks drop the vertex height on both sides until the running surface-edge at this profile vertex.

[0011] As an alternative to a convex or concave surface contour, the surface contour can also be embodied straight in the belt-transverse direction.

[0012] In one technical implementation, the belt running surface can be divided into a front belt outlet at the belt fitting front side and a rear belt outlet at the belt fitting rear side. The two belt outlets can transition into each other at a rounded bridge surface.

[0013] In order to largely prevent lateral displacement of the belt in the belt loop under load, it is preferred that the surface contour alternatively and / or additionally has a wave shape which has a sinusoidal course in the transverse direction of the belt, wherein the wave troughs are offset from the wave crests by an amplitude height.

[0014] The running surface-width of the belt-running surface is approximately in the range of 46 mm to 50 mm.

[0015] In a first embodiment variant, the amplitude height of the wavy profile can be 0.8 mm, while the wavelength can be 6.9 mm. In this case, the number of wave peaks on the running surface-width can be a total of eight wave peaks. In a second embodiment variant, the amplitude height can be 1.0 mm, while the wavelength can be 4.0 mm. In this case, a total of about 13 wave peaks can be constructed on the running surface-width. In another embodiment variant, the amplitude height can be 0.5 mm, while the wavelength can be 2.0 mm. In this case, a total of 25 wave peaks can be produced on the running surface-width.

[0016] In another embodiment, the surface profile can have a groove-like shape formed in the belt running surface, wherein longitudinal grooves are machined into the belt running surface. These longitudinal grooves can be spaced apart in the belt transverse direction via longitudinal ribs. In normal driving operation, when the seat belt is fastened, the belt can be in sliding contact with the belt running surface, while the groove bottoms are not in contact with the belt in each case. Only under load can the belt move into the grooves, thereby providing contact between the belt and the corresponding groove bottoms.

[0017] Each of the longitudinal grooves has a groove base which is set back from the belt running surface by the groove depth, from which lateral flanks rise, which merge into the belt running surface at a particularly rounded transition edge. In a first embodiment variant, the groove depth can be 1.0 mm, while the groove width can be 2.5 mm. The rib width can be 2.0 mm. The groove depth and groove width are designed in such a way that belt damage can be avoided.

[0018] In a second embodiment variant, the longitudinal rib width can be 2.0 mm or 3.0 mm, while the longitudinal groove width can be 3.5 mm and the groove depth can be 2.0 mm. In this case, a total of seven longitudinal ribs spaced apart from one another can be present over the running surface width. In a third embodiment variant, the groove width can be 11.0 mm and the groove depth can be 1.8 mm. The rib width can be in the range between 3.0 mm and 4.5 mm. In this case, a total of two longitudinal ribs spaced apart from one another are present in the belt running surface distributed over its running surface width.

[0019] The belt fitting can be composed of at least one metal body and a plastic encapsulation (hybrid design). In this case, the groove bottom of the corresponding longitudinal groove of the groove-shaped profile can preferably be provided by the metal body in order to reduce the surface roughness of the groove bottom. In contrast, the corresponding longitudinal ribs can be made of a plastic material, which has an increased surface roughness compared to the groove bottom.

[0020] In an alternative embodiment, the groove bottom of the corresponding longitudinal groove can be designed to be smooth or alternatively to be designed with projections. These projections can protrude from the groove bottom via the projection height. The projection height can preferably be dimensioned to be smaller than the groove depth.

[0021] In a further development of the invention, the groove bottom of the respective longitudinal groove of the rib-shaped profile can have a friction coefficient which is dimensioned to be greater than the friction coefficient of the respective longitudinal rib. In this case, under load, an increased static friction occurs between the belt and the groove bottom, so that the belt does not shift in the transverse direction under load. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Embodiments of the present invention will be described below with reference to the accompanying drawings.

[0023] in:

[0024] Figure 1 A detail of a three-point seat belt arrangement is shown in a use position, in which the seat belt is fastened to a vehicle occupant;

[0025] Figure 2 The releasable belt accessory is shown in Figure 1 View in Section Plane II;

[0026] Figure 3 A side view with accessories is shown alone;

[0027] Figures 4 to 15 Different embodiments of the belt running surface of a belt fitting are shown in each case. DETAILED DESCRIPTION

[0028] exist Figure 1 1 shows a three-point seat belt arrangement in the use position, in which the seat belt 5 is fastened to the vehicle occupant. The seat belt 5 has a shoulder belt section 1 and a lap belt section 3, which merge into one another at a belt fitting 7. For the sake of clarity, the driver's seat and the vehicle occupant are not shown. Figure 1 The upper end of the shoulder belt section 1, which is also not shown, can be connected to a retractor, which is not shown, for example, arranged in the B-pillar. Figure 1 The lap belt section 3 extends in the vehicle transverse direction y from an outer connection point (not shown) to the belt fitting 7 , which is inserted with its insertion tongue 9 into the belt buckle 11 .

[0029] The belt fitting 7 consists of a base section 13 and a plug tongue 9. The base section 13 of the belt fitting 7 has a belt loop 15 with a belt running surface 17. When the safety belt 5 is fastened, the belt running surface comes into sliding contact with the belt guided through the belt loop 15.

[0030] exist Figure 2 In the belt running surface 17 , on both sides in the belt transverse direction, in each case at laterally rounded corner regions 19 , the belt loop edge 21 is situated opposite the belt running surface 17 .

[0031] As from Figure 1 As is known, a displacement body 23 is formed at the belt loop edge 21. The displacement body reduces the gap width of the belt loop 15. The displacement body 23 is spaced apart from the corresponding rounded belt corner area 19 on both sides in the belt transverse direction via a belt free space 25. In this way, a slit-shaped belt guide gap 27 ( 25 ) with a reduced through-cross section is provided between the belt running surface 17 and the displacement body 23. Figure 2 or Figure 3 ), which transitions on both sides in the belt transverse direction into a correspondingly larger cross-sectional belt free space 25. Figure 3 In the embodiment shown in FIG. 2 , the belt free space 25 is increased by the profile height h from the belt guiding gap in the direction of the insert tongue 9 .

[0032] As from Figure 2 As can be seen further, the belt running surface 17 is divided into a front belt outlet 29 formed at the belt fitting front side and a rear belt outlet 31 formed at the belt fitting rear side. The two belt outlets 29 , 31 merge into one another at a rounded bridge surface 33 .

[0033] According to the present invention, Figure 3 The belt-running surface 17 in the belt loop 15 has a surface contour 35 which provides a largely stable transverse belt guidance in the belt loop 15 under load. By means of the surface contour 35 of the belt-running surface 17, the transverse load component F acting on the belt under load is counteracted. y ( Figure 1 ).

[0034] Below with the help of Figure 3 A particularly preferred embodiment variant of the surface profile 35 is described: Accordingly, the surface profile 33 has a groove-like shape formed in the belt-running surface 17, wherein a total of four longitudinal grooves 37 are machined into the belt-running surface 17. The longitudinal grooves 37 are spaced apart from one another in the transverse direction of the belt via three longitudinal ribs 39. Figure 3 In the embodiment, the running surface width b is in the range between 46 mm and 50 mm. Each of the longitudinal grooves 37 has a groove bottom 41 ( Fig.10b ), which is set back from the belt-running surface 17 by a groove depth r. The groove depth r is preferably 1.8 mm, while the rib width t is about 3.0 mm, and the groove width c may be in the range of 11 mm.

[0035] according to Figure 3 The belt running surface 17 interrupted by the longitudinal grooves 37 is designed as a whole to be concave, that is, it has a profile bottom 43 (centered in the belt transverse direction) Figure 5 ), profile flank 45( Figure 5 ) at the bottom of the profile on both sides rise to the running surface edge 47. The corresponding belt loop corner area 19 is connected to the running surface edge 47. Figure 2 In the embodiment, the profile bottom 43 is set back relative to the lateral running surface edge 47 by the profile depth k (only in Figure 5 ), the profile depth is in the range between 0.1 and 0.2 mm. In this way, the through cross section of the belt guide gap 27 is the largest at the center of the belt fitting and decreases on both sides in the direction of the corresponding belt loop free space 25.

[0036] Below with the help of Figures 4 to 15 A further embodiment variant of the surface contour 35 formed in the belt running surface 17 is shown: accordingly, in Figure 4 In the embodiment shown in FIG. 1 , the surface contour 35 of the belt running surface 17 is designed to be straight and smooth in the belt transverse direction without additional longitudinal ribs. Figure 5 3 shows a concave surface profile 35, in which the profile base 43 centered in the belt-transverse direction is raised on both sides via profile flanks 45 to the running surface edge 47. The profile base 43 is set back relative to the running surface edge 47 by a profile depth k, which can be between 0.1 mm and 2 mm.

[0037] Figure 6 3 shows a convex surface profile 35 which, in the belt transverse direction, has a central profile apex 49 at which profile flanks 51 drop on both sides to the running surface edge 47 by a apex height h.

[0038] In Figure 7, the surface profile 35 has a wave-like shape formed in the belt-running surface 17, which has a sinusoidal course in the belt-transverse direction, in which the wave trough is set back from the wave crest by an amplitude height a. In Figure 7, the amplitude height a is 0.8 mm. In Figure 7, the wavelength w is 6.9 mm, resulting in a total of six wave crests over the running surface width b.

[0039] 8 , the amplitude height a of the wave profile is 1.0 mm, while the wavelength w is 4.0 mm. In this way, a total of 11 wave peaks are produced over the running width between two running edges 47 .

[0040] 9 , the amplitude height is 0.5 mm, while the wavelength w is 2.0 mm. In this way, a total of 23 wave peaks are produced between the two running surface edges 47 in FIG. 9 .

[0041] In FIG. 10 , the surface profile 35 has a groove-like shape constructed in the belt-running surface 17, in which longitudinal grooves 37 are machined in the belt-running surface 17. These longitudinal grooves are spaced apart from each other in the belt-transverse direction via longitudinal ribs 39. Each longitudinal groove 37 has a groove bottom 41 that is set back from the belt-running surface 17 by the groove depth r. The lateral flanks 42 rise from the groove bottom 41, which transition into the belt-running surface 17 at the preferably rounded transition edge 44. In FIG. 10 , the groove depth r is 1.0 mm, while the longitudinal rib width l is 2.0 mm. In FIG. 10 , the groove width c is 2.5 mm. In FIG. 10 , a total of nine longitudinal ribs 39 spaced apart from each other are produced between two running surface edges 47.

[0042] In the embodiment shown in Figure 11, the groove depth r is 2.0 mm, while the longitudinal rib width l is 2.0 mm. In Figure 11, the groove width c is 3.0 mm. In this way, a total of seven longitudinal ribs 39 spaced apart from one another are produced between two running surface edges 47.

[0043] 12 shows a further embodiment in which the groove depth r is 1.8 mm, the rib width t is 3.0 mm, and the groove width c is 11.0 mm. In this way, a total of two longitudinal ribs 39 spaced apart from one another are produced between the two running surface edges 47 .

[0044] exist Fig.13 In FIG. 5 , the belt fitting 7 is composed of a metal body 53 and a plastic encapsulation 55 . The belt running surface is also assigned a surface contour 35 realized as a rib structure. Fig.13 In the embodiment, the groove bottoms 41 of the longitudinal grooves 37 are respectively provided by a metal body 53 in order to reduce the surface roughness of the groove bottoms 41. In contrast, the longitudinal ribs 39 are made of a plastic material having an increased surface roughness.

[0045] exist Fig.14 In FIG. 4 , the surface profile 35 is also realized as a groove structure, wherein a projection 57 is arranged in each case in the groove bottom 41 . These projections protrude from the groove bottom 41 by a projection height n. Fig.14 In the embodiment, the bump height n is smaller than the groove depth r.

[0046] exist Fig.15 In the embodiment shown, the groove bottom 41 of the rib structure is provided by rubber, gum or elastomer, whereby the groove bottom 41 has an increased coefficient of friction compared to the coefficient of friction of the belt-running surface 17. In this way, under load, an increased static friction is provided between the belt and the groove bottom 41 in order to hold the belt in place.

[0047] Reference numerals list

[0048] 1 shoulder strap section

[0049] 3 waist belt sections

[0050] 5 belt

[0051] 7 belt accessories

[0052] 9 Tongue

[0053] 11 Buckle

[0054] 13 Basic Sections

[0055] 15 with ring

[0056] 17 belt-running surface

[0057] 19 Lateral corner area

[0058] 21 with ring-edge

[0059] 23 Transplantation

[0060] 25 with ring - free space

[0061] 27 Narrow belt-guide gap

[0062] 29 Front belt - outlet

[0063] 31 Rear belt - outlet

[0064] 33 Bridge surface

[0065] 35 Surface Profile

[0066] 37 longitudinal grooves

[0067] 39 longitudinal ribs

[0068] 41 slot bottom

[0069] 42 side flank

[0070] 43 contour bottom

[0071] 44 Rounded transition edges

[0072] 45 Contour Side Wings

[0073] 47 Traveling surface-edge

[0074] 49 contour vertices

[0075] 51 Contour Side Wings

[0076] 53 Metal Body

[0077] 55Plastic packaging department

[0078] 57 Bump

[0079] s Gap Width

[0080] b Traveling surface - width

[0081] R groove depth

[0082] l Rib width

[0083] T-rib width

[0084] k Profile Depth

[0085] hVertex height

[0086] aAmplitude height

[0087] wWavelength

[0088] C groove width

[0089] nBump height

[0090] F y Transverse load component.

Claims

1. A belt fitting for a safety belt device, comprising a base section (13) and a plug tongue (9) protruding from the base section, wherein: The base section (13) has a belt loop (15), the belt loop having a belt running surface (17), which, when the safety belt (5) is fastened, comes into sliding contact with the belt (5) guided through the belt loop (15), wherein the belt running surface (17) transitions on both sides in the transverse direction of the belt in lateral corner regions (19) into a belt loop edge (21) opposite the belt running surface (17), and wherein the belt running surface (17) has a surface contour (35) which, under load, provides a stable transverse belt guidance in the belt loop (15), which counteracts a transverse load component (F) acting on the belt (5). y ), characterized in that a displacement body (23) is constructed at the belt loop edge (21) opposite to the belt running surface (17), the displacement body reducing the gap width of the belt loop (15), and when viewed in the transverse direction of the belt, the displacement body (23) is separated from the corresponding lateral belt loop corner area (19) on both sides via the belt free space (25).

2. The belt accessory according to claim 1, characterized in that A slit-shaped belt-guiding gap (27) with a reduced through-cross section is provided between the belt-running surface (17) and the displacement body (23), the belt-guiding gap transitioning on both sides in the transverse direction of the belt into a corresponding belt-free space (25) with an enlarged through-cross section.

3. The belt accessory according to claim 2, characterized in that: The corresponding belt free space (25) increases in profile height from the belt guide gap (27) in the direction of the insertion tongue (9).

4. The belt accessory according to any one of claims 1 to 3, characterized in that: When viewed in the transverse direction of the belt, the surface profile (35) of the belt running surface (17) is concavely constructed, and the concave surface profile (35) has a central profile bottom (43) in the transverse direction of the belt, profile flanks (45) are raised on both sides of the profile bottom to the running surface edge (47), and the profile bottom (43) is retreated by a profile depth (k) relative to the running surface edge (47).

5. The belt accessory according to any one of claims 1 to 3, characterized in that: When viewed in the transverse direction of the belt, the surface contour (35) of the belt running surface (17) is convexly constructed, and the convex surface contour (35) has a central contour vertex (49) in the transverse direction of the belt, and contour flanks (51) at the contour vertex drop on both sides to the running surface edge (47) by a vertex height (h).

6. The belt accessory according to any one of claims 1 to 3, characterized in that: The surface contour (35) of the belt running surface (17) is designed to be straight in the transverse direction of the belt.

7. The belt accessory according to any one of claims 1 to 3, characterized in that: The belt running surface (17) has a running surface width (b) of 46 mm to 50 mm and / or the belt running surface (17) is divided into a front belt outlet (29) configured at the front side of the belt fitting and a rear belt outlet (31) configured at the rear side of the belt fitting, which transition into each other at a rounded bridging surface (33).

8. The belt accessory according to any one of claims 1 to 3, characterized in that: The surface profile (35) has a wave-like shape formed in the belt running surface (17), the wave-like shape having a sinusoidal course in the transverse direction of the belt, wherein the wave troughs are set back from the wave crests by an amplitude height (a).

9. The belt accessory according to claim 8, characterized in that The amplitude height (a) is in the range of 0.5 mm to 1.0 mm and / or the wavelength (w) is in the range of 2.0 mm to 6.9 mm.

10. The belt accessory according to claim 8, characterized in that The belt-running surface (17) has a running surface-width (b) of 46 mm to 50 mm, wherein the number of the wave peaks in the running surface-width (b) ranges from 6 to 23.

11. The belt accessory according to any one of claims 1 to 3, characterized in that: The surface profile (35) has a groove-like shape constructed in the belt-running surface (17), wherein longitudinal grooves (37) are machined into the belt-running surface (17), which are spaced apart in the belt transverse direction via longitudinal ribs (39).

12. The belt accessory according to claim 11, characterized in that Each longitudinal groove (37) has a groove bottom (41) which is set back from the belt running surface (17) by the groove depth (r), and from which lateral flanks (42) rise, which transition into the belt running surface (17) at transition edges (44).

13. The belt accessory according to claim 12, characterized in that The transition edge (44) is rounded.

14. The belt accessory according to claim 12, characterized in that The groove depth (r) is in the range of 1.0 mm to 2.0 mm.

15. The belt accessory according to claim 11, characterized in that The rib width (t) is in the range of 2.0 mm to 4.5 mm and / or the groove width (c) is in the range of 2.5 mm to 11 mm.

16. The belt accessory according to any one of claims 1 to 3, characterized in that: The belt fitting (7) is composed of at least one metal body (53) and a plastic encapsulation (55).

17. The belt accessory according to claim 12, characterized in that The belt fitting (7) is composed of at least one metal body (53) and a plastic encapsulation portion (55), and the groove bottom (41) of the corresponding longitudinal groove (37) of the groove-shaped profile is provided by the metal body (53) to reduce the surface roughness of the groove bottom (41), while the corresponding longitudinal rib (39) is formed by plastic material.

18. The belt accessory according to claim 12, characterized in that The groove base (41) of the corresponding longitudinal groove (37) is designed to be smooth, or the groove base (41) is designed with a projection (57) which protrudes from the groove base (41) by a projection height (n).

19. The belt accessory according to claim 18, characterized in that The bump height (n) is sized to be smaller than the groove depth (r).

20. The belt accessory according to claim 12, wherein: The groove bottom (41) of the corresponding longitudinal groove (37) of the groove-like profile has a friction coefficient which is greater than the friction coefficient of the corresponding longitudinal rib (39).

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