JP2019099005A - Seat belt device - Google Patents

Abstract

To provide a seat belt device which enables a sufficient reduction of deformation of a chest of an occupant occurring during a frontal collision of a vehicle.SOLUTION: A seat belt device includes: a buckle provided at the lateral side of a seat of a vehicle; a tongue which may engage with the buckle; a lap belt which is used to restrain a lumbar part of an occupant and in which one end is fixed to the tongue and its length is adjusted by a first retractor at the other end side; and a shoulder belt which is formed separately from the lap belt to restrain an upper half body of the occupant and in which one end is fixed to the tongue in an area located at the vehicle front side relative to one end of th lap belt and its length is adjusted by a second retractor at the other end side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a seat belt device mounted on a vehicle.

  There are various types of seat belt devices mounted on a vehicle. For example, Patent Document 1 discloses a seat belt device 100 as shown in FIG. The seat belt device 100 includes a buckle 110 provided on the side of a seat of a vehicle and a tongue 120 engageable with the buckle 110.

  In the seat belt device 100 shown in FIG. 6, the webbing 130 is folded back at the tongue 120 by the lap belt 131 which restrains the waist of the occupant and the shoulder belt 132 which restrains the upper body of the occupant.

  More specifically, the tongue 120 includes a plug-in portion 121 inserted into the buckle 110 and a main body portion 122 extending diagonally forward from above the plug-in portion 121 in the direction opposite to the seat. The seat belt device 100 of FIG. 6 is for the left seat of the vehicle, and the upper left direction in FIG. 6 is the inward direction of the vehicle, and the lower right direction in FIG.

  The main body portion 122 is hollow, and the webbing 130 is inserted into the inside thereof. The seat side opening of the main body portion 122 is a first winding portion 123 serving as a base point of the lap belt 131, and the opening on the opposite side of the seat is a second winding portion 124 serving as a base point of the shoulder belt 132.

  In Patent Document 1, the second winding portion 124 is located on the side opposite to the seat with respect to the first winding portion 123 and above the first winding portion 123, so that the occupant of the occupant is prevented by the shoulder belt 132. It is stated that restraint can be improved. Furthermore, Patent Document 1 describes that the lower part of the shoulder belt 132 can be separated from the lower part of the occupant's chest by positioning the second winding part 124 ahead of the first winding part 123 in the vehicle. There is.

  When the webbing is simply folded back by a tongue into a lap belt and a shoulder belt like a general seat belt device with respect to the seat belt device 100 of Patent Document 1, the origin of the lap belt and the origin of the shoulder belt are the same position become. For this reason, the load caused by the forward movement of the occupant during the frontal collision of the vehicle is applied to the tongue at the same portion of the shoulder belt and the lap belt, and the shoulder belt is almost simultaneously when the lap belt is restrained by the lap belt. The upper body of the occupant was restrained and a large load was applied to the chest of the occupant. From the viewpoint of solving this and suppressing the chest deformation of the occupant at the time of a frontal collision of the vehicle, the second winding portion serving as the base point of the shoulder belt 132 like the seat belt device 100 disclosed in Patent Document 1 It is desirable that the position 124 be ahead of the first winding portion 123 which is the base point of the lap belt 131.

Patent No. 4508116 gazette

  However, in the seat belt device 100 disclosed in Patent Document 1, since the shoulder belt 132 is continuous with the lap belt 131, the lap with respect to the tongue 120 occurs when the occupant moves forward at the time of a frontal collision of the vehicle. The load acting on the lap belt 131 is transmitted to the shoulder belt 132 by the belt 131 being pulled out. As a result, the shoulder belt 132 may press the occupant's chest and the effect of reducing the chest deformation may be insufficient.

  Therefore, an object of the present invention is to provide a seat belt device capable of suppressing the chest deformation of the occupant at the time of a frontal collision of the vehicle to a sufficiently small value.

In order to solve the above problems, a seat belt device according to the present invention is a buckle provided on the side of a seat of a vehicle, a tongue that can be engaged with the buckle, and a lap belt for restraining a waist of an occupant. A lap belt having one end fixed to the tongue and the other end adjusted in length by the first retractor, and a shoulder belt separate from the lap belt for restraining the upper body of the occupant, A shoulder belt whose one end is fixed to the tongue at the vehicle front of the one end of the lap belt and whose length is adjusted by the second retractor at the other end side;
Providing the

  According to the above configuration, the shoulder belt is separate from the lap belt, one end of the both is fixed to the tongue, the other end of the lap belt is attached to the first retractor, and the other end of the shoulder belt is attached to the second retractor Therefore, as in the seat belt device 100 shown in FIG. 6, the lap belt 131 is not pulled out to the tongue 120 at the time of a frontal collision of the vehicle, nor is the load acting on the lap belt 131 transmitted to the shoulder belt 132 . In addition, since one end of the shoulder belt is fixed to the tongue in front of the vehicle than the one end of the lap belt, a gap is provided between the shoulder belt and the lower chest of the occupant, and the load at the time of a front collision of the vehicle is Acts in advance to the lap belt side. This reduces the load from the shoulder belt to a position where the occupant's bone is relatively weak at the time of a frontal collision of the vehicle. Therefore, it is possible to suppress the chest deformation of the occupant at the time of a frontal collision of the vehicle sufficiently small.

  For example, the tongue includes an insertion portion inserted into the buckle, and a main body projecting at least in front of the vehicle from the insertion portion when the insertion portion is inserted into the buckle, the lap belt One end of the shoulder belt may be fixed to the body portion of the tongue, and one end of the shoulder belt may be fixed to a portion of the body portion of the tongue projecting to the front of the vehicle.

  The distance from the center line of the insertion portion of the tongue to the tongue fixing position of the shoulder belt is 70 mm or more, and the distance from the tongue fixing position of the shoulder belt to the tongue fixing position of the lap belt is 130 mm or less. It is also good. If the distance from the center line of the insertion portion of the tongue to the tongue fixing position of the shoulder belt is 70 mm or more, it is possible to effectively reduce the chest deformation of the occupant at the time of a frontal collision of the vehicle. In addition, if the distance from the tongue fixing position of the shoulder belt to the tongue fixing position of the lap belt is 130 mm or less, the tongue can be concealed by the center pillar of the vehicle body when the occupant is not wearing the seat belt device.

  The main body portion of the tongue projects from the insertion portion to the rear of the vehicle in a state where the insertion portion is inserted into the buckle, and one end of the lap belt is stretched rearward of the vehicle in the main body portion of the tongue It may be fixed to the part to be released. According to this configuration, since the one end of the lap belt is fixed to the portion of the tongue main body projecting to the rear of the vehicle, the occupant can easily grasp the upper side of the insertion portion. Therefore, the insertion and removal of the tongue of the tongue into the buckle can be facilitated, and the operability of the tongue can be improved.

  When the tongue is in the opposite direction to the normal direction, the insertion portion can not be inserted into the buckle, or the tongue can not be engaged with the buckle even though the insertion portion can be inserted into the buckle It may be configured as follows. According to this configuration, the occupant can be prevented from engaging the tongue in the wrong direction with the buckle.

  According to the present invention, it is possible to sufficiently reduce the amount of chest deformation of the occupant at the time of a frontal collision of the vehicle.

(A) is a perspective view of the seat belt device concerning one embodiment of the present invention, (b) is a side view showing the state where the passenger equipped the seat belt device. It is a perspective view of a part of seat belt device shown in Drawing 1 (a) and (b). It is a top view of tongue. It is a graph which shows the test result of the chest deformation at the time of the front collision of a vehicle. (A) is a figure which shows the state in which the tongue in the seatbelt apparatus of a modification was inserted in the buckle by a regular direction, (b) is a figure which shows the state which the same tongue inserted in the buckle in the reverse direction. . It is a perspective view of a part of conventional seat belt device.

  FIGS. 1A and 1B and FIG. 2 show a seat belt device 2 according to an embodiment of the present invention. The seat belt device 2 is mounted on a vehicle 1.

  Specifically, the seat belt device 2 includes a buckle 3 provided on the side of the seat 11 of the vehicle 1 and a tongue 4 engageable with the buckle 3. The buckle 3 is fixed to the vehicle body via the anchor plate 31. The occupant engages the tongue 4 with the buckle 3 when mounting the seat belt device 2.

  Furthermore, the seat belt device 2 includes a lap belt 5 for restraining the waist of the occupant, and a shoulder belt 6 for restraining the upper body of the occupant. The shoulder belt 6 is separate from the lap belt 5.

  One end of the wrap belt 5 is fixed to the tongue 4. A first retractor 13 is provided on the side of the seat 11 opposite to the buckle 3, and the other end of the lap belt 5 is attached to the first retractor 13. The first retractor 13 is for adjusting the length of the lap belt 5 at the other end side of the lap belt 5. The first retractor 13 is a winding type, and is provided with an energy absorbing mechanism that absorbs the kinetic energy of the occupant by pulling out the webbing while generating resistance when a load above a predetermined level acts on the lap belt 5 However, depending on the characteristics of the vehicle and the position of the seat, it may not have an energy absorbing mechanism.

  One end of the shoulder belt 6 is fixed to the tongue 4 ahead of the one end of the lap belt 5 in the vehicle. A second retractor 14 is provided on the side of the seat 11 opposite to the buckle 3, and the other end of the shoulder belt 6 is attached to the second retractor 14. The shoulder belt 6 is folded back by a shoulder anchor provided on the center pillar 12 of the vehicle body. The second retractor 14 is for adjusting the length of the shoulder belt 6 at the other end side of the shoulder belt 6. The second retractor 14 is a winding type and has an energy absorbing mechanism like the first retractor 13. However, depending on the characteristics of the vehicle and the position of the seat, even the one without the energy absorbing mechanism may be used. good.

  As shown in FIGS. 2 and 3, the tongue 4 has a main body 43 to which one end of the lap belt 5 and one end of the shoulder belt 6 are fixed, and a plug-in portion 41 which protrudes from the main body 43 and is inserted into the buckle 3. including. Although the tongue 4 is plate-shaped in the example of a figure, the tongue 4 may consist of a metal plate and resin which covers this metal plate partially, and the insertion part 41 may be comprised only by a metal plate.

  In the insertion portion 41, an engagement hole 42 is formed. On the other hand, the buckle 3 has an insertion port into which the insertion portion 41 is inserted, and the buckle 3 engages with the engagement hole 42 when the insertion portion 41 is inserted into the insertion port. A hook member is provided. The engagement between the hook member and the engagement hole 42 is released by pushing the release button (not shown) of the buckle 3.

  In the present embodiment, the tongue 4 is substantially T-shaped, and the main body 43 projects from the insertion portion 41 to the front and rear of the vehicle in a state where the insertion portion 41 is inserted into the buckle 3. Further, one end of the shoulder belt 6 is fixed to a portion 43A of the main body 43 that protrudes to the front of the vehicle, and one end of the lap belt 5 is fixed to a portion 43B of the main body 43 that protrudes to the rear of the vehicle.

  In the present embodiment, a long hole 44 is formed in a portion 43A of the main body 43 that protrudes to the front of the vehicle, and one end of the shoulder belt 6 is sewn in a state of being inserted into the long hole 44 and folded back. Similarly, a long hole 45 is formed in a portion 43B of the main body 43 that protrudes to the rear of the vehicle, and one end of the lap belt 5 is sewn in a state of being inserted into the long hole 45 and folded back. The long holes 44 and 45 are long in the front-rear direction of the vehicle. The width of one end of the shoulder belt 6 inserted into the long hole 44 substantially coincides with the width of the long hole 44, and the width of one end of the lap belt 5 inserted into the long hole 45 is equal to that of the long hole 45. It almost matches the width.

  The long side center of the long hole 44 as the tongue fixing position of the shoulder belt 6 from the center line L (the center line in the width direction of the insertion portion 41) of the insertion portion 41 of the tongue 4 (the length on the opposite side to the insertion portion 41) It is desirable that the distance AS to the center of the side be 70 mm or more. This is because the amount of chest deformation of the occupant at the time of a frontal collision of the vehicle 1 can be effectively reduced. Further, the distance AS is a distance in the width direction of the insertion portion 41.

  The distance D from the center of the long side of the long hole 44 to the center of the long side of the long hole 45 (the center of the long side opposite to the insertion portion 41) as the tongue fixing position of the lap belt 5 The sum of the distance AL from the center line L of the insertion portion 41 of the tongue 4 to the center of the long side of the long hole 45 is preferably 130 mm or less. This is because the tongue 4 can be hidden by the center pillar 12 of the vehicle body when the occupant is not wearing the seat belt device 2. Further, the distance D and the distance AL are distances in the width direction of the insertion portion 41.

  As described above, in the seat belt device 2 of the present embodiment, the shoulder belt 6 is a separate body from the wrap belt 5, one end of the both is fixed to the tongue 4, and the other end side of the wrap belt is the first retractor 13 Since the other end side of the shoulder belt is attached to the second retractor 14, the occupant moves forward at the time of a front collision of the vehicle as in the seat belt device 100 shown in FIG. No pulling out of the belt 131 or transfer of a load acting on the lap belt 131 to the shoulder belt 132. Moreover, since one end of the shoulder belt 6 is fixed to the tongue 4 ahead of the lap belt 5 on the vehicle front side than the one end of the lap belt 5, a gap is provided between the shoulder belt 6 and the lower chest of the occupant and at the time of a front collision of the vehicle. The load caused by the forward movement of the occupant acts on the lap belt side in advance. This reduces the load from the shoulder belt 6 to a position where the rigidity of the bone is relatively weak at the time of a frontal collision of the vehicle. Therefore, it is possible to suppress the chest deformation of the occupant at the time of a frontal collision of the vehicle sufficiently small.

  Here, FIG. 4 shows an example of a CAE (computer aided engineering) analysis result of a frontal collision test according to the new vehicle assessment program (NCAP) of the US Road Traffic Safety Administration (NHTSA). As the test conditions, the collision velocity is 56 km / h as defined in NCAP. As CAE analysis software, MADYMO (TASS International Ltd.) was used. The broken line in FIG. 4 indicates the amount of chest deformation of the occupant at the time of a frontal collision of the vehicle when the distance AS is changed after setting the distance AL to 20 mm. The solid line in FIG. 4 indicates the amount of chest deformation of the occupant at the time of a frontal collision of the vehicle when the distance AS is changed after setting the distance AL to 50 mm. The alternate long and short dash line in FIG. 4 indicates the amount of chest deformation of the occupant at the time of a frontal collision of the vehicle when the distance AS is changed after setting the distance AL to 80 mm.

  In the vehicle used for this analysis, when the webbing is simply folded back by the tongue into the lap belt and the shoulder belt (when the base point of the lap belt and the base point of the shoulder belt are at the same position), The chest deformation of the occupant was 33 mm as shown by the two-dot chain line in FIG. On the other hand, if the configuration as in this embodiment is adopted for this vehicle, as indicated by the broken line, solid line and one-dot chain line in FIG. Be In particular, if the distance AS is set to 70 mm or more, the chest deformation of the occupant at the time of a frontal collision of the vehicle can be effectively reduced. Furthermore, if the distance AS is set to 90 mm or more, the chest deformation of the occupant at the time of a frontal collision of the vehicle can be further effectively reduced. However, when the distance AS is set to 90 mm or more, the chest deformation can be suppressed to 25 mm or less by setting the distance D (= AS + AL) to 130 mm or less.

(Modification)
The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the scope of the present invention.

  For example, the tongue 4 may have a substantially L-shaped plate shape, and the main body 43 may project from the insertion portion 41 only in front of the vehicle with the insertion portion 41 inserted in the buckle 3. In this case, the tongue fixing position of the lap belt 5 may be on the center line L of the insertion portion 41. However, as in the embodiment described above, the main body 43 projects from the insertion section 41 not only to the front of the vehicle but also to the rear of the vehicle when the insertion section 41 is inserted into the buckle 3. If one end of the lap belt 5 is fixed to the hooked portion 43B, the occupant can easily grasp the upper side of the insertion portion 41. Therefore, the insertion and removal of the insertion portion 41 of the tongue 4 from the buckle 3 is facilitated, and the operability of the tongue 4 can be improved.

  Further, the method of fixing one end of the lap belt 5 and one end of the shoulder belt 6 to the tongue 4 is not limited to that described in the above embodiment. For example, a round hole is formed in the main body 43 of the tongue 4 as a hole for fixing the lap belt 5, and a circular hole is formed as a hole for fixing the shoulder belt 6, and one end of the lap belt 5 One end of the shoulder belt 6 may be fixed. In this case, the tongue fixing positions of the lap belt 5 and the shoulder belt 6 are at the center of the upper arc of the round hole.

  Furthermore, when the tongue 4 is in the opposite direction to the normal direction, the tongue 4 can not be inserted into the buckle 3, or the tongue 4 can be inserted into the buckle 3 even if the insertion portion 41 can be inserted into the buckle 3. It is desirable to be configured so that it can not be engaged. According to this configuration, it is possible to prevent the occupant from engaging the tongue 4 in the wrong direction with the buckle 3.

  For example, as shown in FIGS. 5 (a) and 5 (b), a projection 48 projecting along the insertion portion 41 is provided at the root of the portion 43A of the body 43 of the tongue 4 projecting forward of the vehicle A projecting portion 32 may be provided at the rear of the vehicle at the insertion port at 3. With such a configuration, the tongue 4 can be engaged with the buckle 3 as shown in FIG. 5 (a) if the tongue 4 is in the normal direction, but as shown in FIG. 5 (b), the tongue If 4 is in the opposite direction, the tongue 4 can not be engaged with the buckle 3 due to the interference between the protrusions 48 and 32.

1 Vehicle 11 Seat 13 First Retractor 14 Second Retractor 2 Seat Belt Device 3 Buckle 4 Tongue 41 Insertion 43 Main Body 5 Lap Belt 6 Shoulder Belt

Claims (5)

A buckle provided on the side of the vehicle seat,
A tongue engageable with the buckle;
A lap belt for restraining a waist of an occupant, the lap belt having one end fixed to the tongue and the other end adjusted in length by the first retractor;
A shoulder belt separate from the lap belt for restraining the upper body of the occupant, wherein one end is fixed to the tongue in front of the vehicle than the one end of the lap belt, and the other end is lengthened by the second retractor Shoulder belts are adjusted,
, A seat belt device. The tongue includes an insertion portion inserted into the buckle, and a main body protruding at least from the insertion portion toward the front of the vehicle when the insertion portion is inserted into the buckle.
2. The seat according to claim 1, wherein one end of the lap belt is fixed to the main body of the tongue, and one end of the shoulder belt is fixed to a portion of the main body of the tongue overhanging forward of the vehicle. Belt device. The distance from the center line of the inset portion of the tongue to the tongue fixing position of the shoulder belt is 70 mm or more.
The seat belt device according to claim 2, wherein a distance from a tongue fixing position of the shoulder belt to a tongue fixing position of the lap belt is 130 mm or less. The body portion of the tongue also projects from the insertion portion toward the rear of the vehicle in a state where the insertion portion is inserted into the buckle.
4. The seat belt device according to claim 2, wherein one end of the lap belt is fixed to a portion of the body portion of the tongue projecting to the rear of the vehicle. When the tongue is in the opposite direction to the normal direction, the insertion portion can not be inserted into the buckle, or the tongue can not be engaged with the buckle even though the insertion portion can be inserted into the buckle The seat belt apparatus according to any one of claims 2 to 4, which is configured as follows.

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