JP5530148B2 - Seat belt device - Google Patents

Description

  The present invention relates to a seat belt device including a through anchor through which a webbing for restraining an occupant is inserted.

  Conventionally, vehicle seats have been equipped with occupant restraint seat belt devices that prevent occupants from jumping forward due to inertial forces when a large deceleration is applied to the vehicle, such as when the vehicle suddenly stops or crashes. ing. In the case of the seat belt for the front seat, the webbing that restrains the occupant is pulled out from the retractor winding the webbing upward in the vehicle, and is inserted into a through anchor arranged at the upper part of the center pillar (B pillar). The through anchor is provided with a slit-shaped insertion hole, through which the webbing is folded downward in the vehicle.

  An anchor plate is attached to the folded webbing tip, and is fixed below the passenger compartment. A tongue plate that is slidable on the webbing by inserting the webbing is disposed between the through anchor and the anchor plate. The occupant grips the tongue plate, pulls out the webbing against the force of the retracting direction by the retractor, attaches the tongue plate to the buckle located on the opposite side of the seat (vehicle center side), and restrains his body .

  In such a three-point seat belt device, there has conventionally been a problem called jamming in which the webbing is shifted to one side of the through-anchor insertion hole. This occurs when the webbing is abruptly wound or pulled out by the retractor. Jamming causes wrinkles in the webbing, and a large tension is applied locally. For this reason, it is necessary to use a material having a high tensile strength for the webbing, which has been one of the causes of cost increase. Further, there is a problem that the webbing is fixed on one side of the insertion hole due to jamming, and the load limiter function of the retractor is obstructed.

  For example, Patent Document 1 discloses a shoulder anchor having a webbing insertion hole as a webbing insertion member corresponding to the through anchor. A pair of convex portions project from the hook portion below the webbing insertion hole on the back surface of the shoulder anchor (surface on the vehicle body side) with a gap slightly wider than the width of the webbing. According to Patent Document 1, these convex portions function as a webbing guide portion, whereby sliding of the webbing to the left and right (longitudinal direction of the webbing insertion hole), that is, jamming can be prevented.

JP 2002-308043 A

  However, in the technique described in Patent Document 1, the webbing ear portion easily comes into sliding contact with the convex portion provided as the webbing guide portion. When sliding, the webbing is both pulled out and wound up, and the webbing is required to be pulled out, making it difficult to attach and detach the seat belt. Further, the webbing ear is worn by the sliding contact, and the life of the webbing is shortened.

  In view of the above problems, the present invention provides a seat belt device that can smoothly pull out and wind a webbing while preventing jamming of the webbing through a through-anchor insertion hole, and does not cause webbing wear. The purpose is that.

  In order to solve the above-described problems, a typical configuration of a seat belt device according to the present invention includes a through anchor that slides a webbing coming from below near the shoulder of a vehicle seat from the vehicle body side toward the vehicle interior. In the seat belt apparatus provided, the through anchor has a fixed portion that is rotatably fixed to the vehicle body, and an insertion hole through which the webbing is inserted, and the insertion hole is a linear portion that extends substantially linearly in the vehicle longitudinal direction. And a turning portion turned upward from the front end of the straight portion of the vehicle, and the through anchor further has a mortar-side guide surface that spreads from the turning portion toward the vehicle interior side. And The “end-side mortar side surface shape” includes a bank shape.

  According to the above configuration, when the webbing slides on the through anchor and is taken up by the retractor (pretensioner), a part of the webbing that extends obliquely from the vehicle body side toward the vehicle inner side enters the turning portion. In this way, the turning portion can escape without causing the webbing to come into sliding contact with any element, so that smooth webbing can be taken up.

  When the webbing enters the turning portion, the webbing that has been slid on the convex surface of the linear portion until then slides on the guide surface. Since the guide surface is a concave surface having a mortar side surface shape, a part of the webbing slides stably along the guide surface. Since the guide surface is in the shape of a mortar that is wide at the end, even if the direction in which the webbing is pulled out changes, the guide surface fits well with the surface of the webbing. Thus, the guide surface can maintain surface contact with the webbing without causing wrinkles in the webbing, so that the surface pressure is stabilized and jamming is prevented. Therefore, the load limiter function of the retractor is not hindered.

  When the webbing is wound around the retractor (pretensioner), conventionally, the through anchor rotates backward (counterclockwise in the case of a driver's seat belt device), and jamming is likely to occur in front of the vehicle through the insertion hole. . However, in the case of the present invention, even if the through anchor rotates backward, the webbing enters the turning portion and can continue sliding on the guide surface with a stable surface pressure.

  In order to solve the above-mentioned problems, another typical configuration of the seat belt device according to the present invention is a through-sliding mechanism in which a webbing coming from below in the vicinity of a shoulder portion of a vehicle seat is folded and slid from the vehicle body side to the vehicle interior side. In a seat belt device provided with an anchor, the through anchor has a fixed portion that is rotatably fixed to the vehicle body, and an insertion hole through which the webbing is inserted, and the insertion hole extends substantially linearly in the vehicle front-rear direction. A straight portion and two symmetrical turning portions respectively turning upward from both front and rear ends of the straight portion, and the through anchor further extends from the two turning portions to the vehicle interior side. It has two symmetrical guide surfaces in the shape of a mortar side.

  According to said structure, since a through anchor has a symmetrical shape in the vehicle front-back direction, the same through anchor can be used for both a driver seat and a passenger seat. Manufacturing costs can be reduced by sharing such parts. Needless to say, effects such as smooth webbing pull-out, jamming prevention, and stable sliding of the surface pressure on the guide surface can be obtained regardless of whether it is used for the driver seat or the passenger seat.

  The guide surface may be smoothly connected to the straight portion. According to this configuration, when the webbing enters the turning portion from the straight portion, it can smoothly move to the guide surface. Further, when the webbing contacts from the convex surface of the straight portion to the guide surface which is a concave surface, the surface pressure against the webbing is more stable.

  The through anchor further includes a stepped portion projecting toward the vehicle body in the vicinity of the vehicle rear end of the straight portion of the insertion hole, and the stepped portion is inclined toward the insertion hole side and downwardly toward the vehicle rear. It is good to have an inclined surface.

  According to the above configuration, the webbing and the inclined surface are not slidably contacted at normal times. However, when the webbing is suddenly pulled out from the retractor, the pulling direction of the webbing from the through anchor itself changes, and the through anchor may rotate excessively forward (clockwise in the case of a driver seat belt device). . At this time, since the inclined surface of the stepped portion is in sliding contact with the webbing on the vehicle body side of the through anchor, excessive rotation of the through anchor is limited, jamming in the rear of the vehicle caused by excessive rotation is prevented, and surface contact is caused. Stable surface pressure is maintained.

  The sliding contact described above occurs only when the webbing is suddenly pulled out from the retractor, and does not occur constantly. Therefore, the ear portion of the webbing is not worn.

  When the through anchor has a symmetrical shape in the vehicle longitudinal direction, it further includes two symmetrical stepped portions projecting toward the vehicle body in the vicinity of both front and rear ends of the straight portion of the insertion hole. Each part may have a symmetrical inclined surface on the side of the insertion hole that is inclined so that the lower part is separated from the insertion hole.

  According to the above configuration, even in a common through anchor that can be used for both a driver seat and a passenger seat, a stable surface pressure due to surface contact is maintained, and wear of the webbing ear is prevented.

  According to the present invention, it is possible to provide a seat belt device that can smoothly pull out and wind up the webbing while preventing jamming of the webbing through the through-anchor insertion hole and does not cause webbing wear.

It is a figure which illustrates the structure of the seatbelt apparatus common to all embodiment of this invention. It is a front view of the through anchor applied to the seat belt device of FIG. 1 and constituting the first embodiment. It is the expansion perspective view which looked at the turning part of FIG. 2 toward the vehicle front. It is AA sectional drawing of Fig.2 (a). It is CC sectional drawing of Fig.2 (a). FIG. 5 is an arrow view of FIG. It is a front view of the through anchor applied to the seat belt device of FIG. 1 and constituting a second embodiment. It is DD sectional drawing of FIG. It is a figure which illustrates the through anchor as a comparative example.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not shown.

(Seat belt device)
FIG. 1 is a diagram illustrating a configuration of a seat belt apparatus common to all embodiments of the present invention. The seat belt device 100 includes a through anchor 130 that folds and slides the webbing 120 coming from the lower retractor 112 near the shoulder of the vehicle seat 110 from the vehicle body side to the vehicle interior side.

  An anchor plate 140 is stitched to the end of the webbing 120 that is folded back by the through anchor 130. Although the anchor plate 140 is not fixed in FIG. 1, it is actually attached to the lower end of the vehicle body between the door 150 and the seat 110 with bolts or the like. A tongue plate 160 through which the webbing 120 is inserted is provided between the through anchor 130 and the anchor plate 140. The tongue plate 160 is engaged with the buckle 170 attached to the center of the vehicle, and the seat belt device 100 is put on.

(First embodiment: through anchor with asymmetric shape)
FIG. 2 is a front view of a through anchor that is applied to the seat belt device of FIG. 1 and constitutes the first embodiment. The through anchor 130A shown in FIG. 2 can be used as the through anchor 130 shown in FIG. 2A is a diagram illustrating a state where the webbing 120 is stationary while restraining the occupant's body, and FIG. 2B is a diagram illustrating a state where the webbing 120 is wound around the retractor (pretensioner). It is a figure illustrated.

  The through anchor 130A includes a fixing portion 190 that is rotatably fixed to the vehicle body by a bolt 180. In the present embodiment, the through anchor 130A is fixed by providing a mounting hole in the center pillar 192 as illustrated in FIG. However, the through anchor 130A may be fixed to an adjustable shoulder anchor (not shown) that can freely move the through anchor 130A in the vertical direction and adjust the folding height of the webbing 120.

  As illustrated in FIG. 2, the through anchor 130 </ b> A also has a slit-like insertion hole 200 through which the webbing 120 is inserted. Insertion hole 200 includes a straight portion 200A that extends substantially linearly in the vehicle front-rear direction, and a turning portion 200B that turns upward from an end of the straight portion 200A in front of the vehicle.

  The through anchor 130A further has a mortar side surface-shaped guide surface 210 that spreads from the turning portion 200B toward the vehicle interior side.

(Turning part / guide surface)
FIG. 3 is an enlarged perspective view of the turning portion 200B of FIG. 2 as viewed from the front of the vehicle. 4 is a cross-sectional view taken along the line AA in FIG. 2A, and FIG. 5 is a cross-sectional view taken along the line CC in FIG. As illustrated in FIG. 3, the guide surface 210 is a mortar-side concave surface. The cross section of the straight portion 200A, that is, the surface 220 on which the webbing 120 slides is a convex surface having an arcuate contour. The guide surface 210 is smoothly connected to the straight portion 200A. Therefore, the convex surface 220 on which the webbing 120 slides smoothly changes to the guide surface 210 (concave surface) from the straight portion 200A to the turning portion 200B.

  According to the above configuration, when the webbing 120 slides through the through anchor 130A and is taken up by the retractor (pretensioner), a part of the webbing 120 extending from the vehicle body side to the vehicle inner side is inclined as shown in FIG. ), The vehicle enters the turning portion 200B. In this way, the turning portion 200B can escape without causing the webbing 120 to come into sliding contact with any element, so that the webbing 120 can be smoothly wound.

  When the webbing 120 enters the turning portion 200B, the webbing 120 that has been sliding on the convex surface 220 of the linear portion 200A until then slides on the guide surface 210. Since the guide surface 210 is a mortar-side concave surface, a part of the webbing 120 slides stably along the guide surface 210. Since the guide surface 210 has a mortar side surface shape that spreads toward the end, even if the direction in which the webbing 120 is pulled out changes, the guide surface 210 is well adapted to the surface of the webbing 120. Thus, since the guide surface 210 can maintain surface contact with the webbing 120 without causing wrinkles on the webbing 120, the surface pressure is stabilized and jamming is prevented. Therefore, the load limiter function of the retractor 112 is not hindered.

  FIG. 9 is a diagram illustrating a through anchor 10 as a comparative example. The through anchor 10 has the insertion hole 20 formed of a linear slit, and does not have the turning portion 200B and the guide surface 210 as in the present embodiment. When the webbing 30 is wound around a retractor (not shown in FIG. 9), as illustrated in FIG. 9, the through anchor 10 rotates backward (counterclockwise in the case of a seat belt device for a driver's seat), and the insertion hole It was easy for jamming to cause wrinkles 40 on the webbing 30 in front of 20 vehicles.

  However, in the case of the present embodiment, as illustrated in FIG. 2B, when the webbing 120 is wound around the retractor, the webbing 120 enters the turning portion 200B, and the guide surface 210 (concave surface) of the turning portion 200B. Because of surface contact, the surface pressure is stable and jamming does not occur. As shown in FIG. 2B, even when the through anchor 130 </ b> A rotates backward, the webbing 120 enters the turning portion 200 </ b> B and maintains surface contact with the guide surface 210 in a stable surface pressure state. Therefore, even when the webbing is pulled out by the load limiter mechanism of the retractor, the function is not hindered.

  Further, since the guide surface 210 is smoothly connected to the straight portion 200A, the webbing 120 can smoothly move to the guide surface 210 when entering the turning portion 200B from the straight portion 200A. This is because when the webbing 120 comes into contact with the guide surface 210 which is a concave surface from the convex surface of the straight part 200A, the surface pressure against the webbing 120 is more stable.

  Note that the “end-side mortar side surface shape” of the guide surface 210 includes a bank shape. A “bank” is a cant. Kant is a shape with the curved outer periphery side of the road surface or track surface raised in order to reduce the influence of centrifugal force acting on the passing vehicle at the curved part of the road or railroad track, which causes the vehicle to tilt inward . In the case of roads, it is also called a “bank”.

  When the guide surface 210 has a bank shape, the curved outer peripheral side of the portion of the guide surface 210 corresponding to the curved portion of the road or railway line along the turning portion 200B is higher. When the bank shape reaches the straight line portion 200A, the bank shape smoothly connects to the convex surface 220 having an arcuate contour. The convex surface 220 has a circular cross section as shown in FIG. 4 (all contours are arc-shaped), but at least the upper half contour on which the webbing 120 slides may be arc-shaped, and the webbing 120 slides. The outline shape of the substantially lower half not to be determined may be freely determined.

(Steps and inclined surfaces)
FIG. 6 is an arrow view of FIG. The through anchor 130 </ b> A further includes a stepped portion 230 that protrudes toward the vehicle body side (rear side) in the vicinity of the vehicle rear end portion of the linear portion 200 </ b> A of the insertion hole 200. The state in which the stepped portion 230 protrudes is as illustrated in FIG. As illustrated in FIG. 6A, the stepped portion 230 has an inclined surface 230 </ b> A whose lower side is inclined at an angle α (about 30 ° to 45 °) to the rear of the vehicle on the insertion hole 200 side.

  According to the above configuration, the webbing 120 and the inclined surface 230A are not slidably contacted as illustrated in FIG. However, when the webbing 120 is suddenly pulled out from the retractor, as illustrated in FIG. 6B, the pulling direction of the webbing 120 from the through anchor 130A itself changes, and the through anchor 130A also moves forward (the seat belt for the driver's seat). In the case of the device, it may rotate excessively in the clockwise direction (FIG. 6 is counterclockwise because the through anchor 130A is viewed from the vehicle body side). At this time, since the inclined surface 230A of the stepped portion 230 is in sliding contact with the webbing 120 on the vehicle body side of the through anchor 130A, excessive rotation of the through anchor 130A is restricted, and jamming in the rear of the vehicle caused by excessive rotation is prevented. And stable surface pressure due to surface contact is maintained.

  The sliding contact described above occurs only when the webbing 120 is suddenly pulled out from the retractor 112 and does not occur constantly. Therefore, the ear part of the webbing 120 is not worn.

  The roles of the guide surface 210 and the inclined surface 230A of the stepped portion 230 provided on the front and back surfaces of the through anchor 130A are summarized below. The guide surface 210 prevents jamming of the insertion hole 200 in the front of the vehicle when the webbing 120 is rapidly wound and the through anchor 130A is about to rotate rearward of the vehicle. On the other hand, the inclined surface 230A limits excessive rotation of the through anchor to the front of the vehicle, which can occur when the webbing 120 is pulled out rapidly, and prevents jamming of the insertion hole 200 in the rear of the vehicle.

(Second Embodiment: Symmetrical Through Anchor)
FIG. 7 is a front view of a through anchor constituting a second embodiment applied to the seat belt device of FIG. 1, and FIG. 8 is a sectional view taken along the line DD of FIG. As the through anchor 130 in FIG. 1, the through anchor 130C in FIG. 7 can be used. Hereinafter, the same elements as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The through anchor 130 </ b> C in the present embodiment has an insertion hole 300 having a symmetrical shape in the vehicle longitudinal direction. That is, two symmetrical turning portions 300B turned upward from both front and rear ends of the straight portion 300A of the insertion hole 300 and two symmetrical guide surfaces 210 are provided. Further, as illustrated in FIG. 8, two symmetrical step portions 230 and an inclined surface 230 </ b> A that protrude toward the vehicle body side (back side) are included in the vicinity of both the front and rear ends of the straight portion 300 </ b> A. The inclined surfaces 230 </ b> A are inclined so that the lower side is away from the insertion hole 300.

  Since the through anchor 130C of the second embodiment has a symmetrical shape in the vehicle front-rear direction, the same through anchor 130C can be used for both the driver seat and the passenger seat. Manufacturing costs can be reduced by sharing such parts. Regardless of whether it is used for a driver seat or a passenger seat, smooth winding of the webbing 120 and prevention of jamming, stable sliding of the surface pressure on the guide surface 210, wear of the ear portion of the webbing 120 on the inclined surface 230A Effects such as prevention can be obtained.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. However, the embodiments described above are preferred examples of the present invention, and other embodiments can be implemented by various methods. Can be carried out. The invention is not limited to the detailed shape, size, configuration, and the like of the components shown in the accompanying drawings unless otherwise specified in the present specification. In addition, expressions and terms used in the present specification are for the purpose of explanation, and are not limited thereto unless otherwise specified.

  Therefore, it is obvious for those skilled in the art that various changes and modifications can be conceived within the scope of the claims, and these naturally belong to the technical scope of the present invention. It is understood.

  INDUSTRIAL APPLICABILITY The present invention can be used for a seat belt device provided with a through anchor through which a webbing for restraining passengers is inserted.

DESCRIPTION OF SYMBOLS 100 ... Seat belt apparatus 110 ... Seat 112 ... Retractor 120 ... Webbing 130, 130A, 130B, 130C ... Through anchor 140 ... Anchor plate 150 ... Door 160 ... Tang plate 170 ... Buckle 180 ... Bolt 190 ... Fixing part 200, 300 ... Insertion Hole 200A ... Linear part 200B ... Turning part 210 ... Guide surface 230 ... Step part 230A ... Inclined surface

Claims (5)

In a seatbelt device provided with a through anchor that folds and slides a webbing coming from below near the shoulder of a vehicle seat from the vehicle body side to the vehicle interior side,
The through anchor is
A fixed part rotatably fixed to the vehicle body,
An insertion hole for inserting the webbing;
Have
The insertion hole is
A linear portion extending substantially linearly in the vehicle longitudinal direction;
A turning portion turned upward from an end portion of the straight portion in front of the vehicle;
Including
The through anchor further when drawn contour toward the outer side from the turning portion, the interval of a plurality of straight line perpendicular to the contour lines, is a concave shape to spread toward the vehicle interior side from the deflection unit A seat belt device having a mortar side surface-shaped guide surface that spreads at the end. In a seatbelt device provided with a through anchor that folds and slides a webbing coming from below near the shoulder of a vehicle seat from the vehicle body side to the vehicle interior side,
The through anchor is
A fixed part rotatably fixed to the vehicle body,
An insertion hole for inserting the webbing;
Have
The insertion hole is
A linear portion extending substantially linearly in the vehicle longitudinal direction;
Two symmetrical turning portions respectively turning upward from both front and rear ends of the linear portion;
Including
The through anchor further when drawn contours respectively from said two turning portions toward the outer side, the interval of a plurality of straight line perpendicular to the contour lines, concave surface spread from the turning section toward the vehicle interior side A seatbelt device having two symmetrical guide surfaces in the shape of a mortar side surface that is shaped like a divergent end.   The seat belt device according to claim 1, wherein the guide surface is smoothly connected to the linear portion. The through anchor further includes a stepped portion projecting toward the vehicle body in the vicinity of the vehicle rear end of the straight portion of the insertion hole,
2. The seat belt device according to claim 1, wherein the stepped portion has an inclined surface, the lower side of which is inclined toward the rear of the vehicle, on the side of the insertion hole. The through anchor further includes two symmetrical step portions projecting toward the vehicle body in the vicinity of both front and rear ends of the straight portion of the insertion hole,
3. The seat belt device according to claim 2, wherein each of the two step portions has a symmetrical inclined surface that is inclined so that a lower portion thereof is separated from the insertion hole on a side of the insertion hole.

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