JP6571622B2 - Rocking tongue and seat belt device - Google Patents

Description

  The present invention relates to a locking tongue and a seat belt device, and more particularly to a locking tongue and a seat belt device that are detachably coupled to a buckle.

  2. Description of the Related Art Conventionally, in vehicles such as automobiles, a so-called three-point seat belt device for protecting a driver and a passenger at the time of a vehicle collision has been proposed. In a three-point seat belt device, when the tongue is properly coupled to the buckle, a lap belt that extends across the waist of the occupant sitting in the seat and a shoulder belt that extends across the chest of the occupant Protects passengers.

  Further, the webbing can normally be freely pulled out from the retractor, and the occupant is fastened to a predetermined position. In the event of a vehicle collision, the retractor is locked by, for example, an inertia mechanism to prevent the webbing from being pulled out further. As a result, the webbing securely holds the occupant in place on the seat during a collision.

  In a vehicle collision, basically, the retractor is locked and the webbing is not pulled out. At this time, the tension on the lap side (waist belt side) increases, but the tension on the shoulder side (shoulder belt side) also increases as the lap side tension increases. In order to prevent this, the locking member arranged in the tongue is moved or rotated to clamp the webbing inserted into the tongue webbing insertion hole to prevent the webbing movement, and the shoulder belt and the lap belt A locking tongue has been devised (see, for example, Patent Document 1).

  In the tongue for a seat belt device described in Patent Document 1, shaft portions (rotating shafts) formed to protrude from both axial end portions of a clamper (lock member) are rotatably supported by a clamper housing portion of the tongue, and the clamper rotates. By doing so, the webbing is clamped between the clamp part of the clamper and the bottom surface of the clamper housing part.

JP 2014-1225022 A

  By the way, in the locking tongue having the rotation mechanism as described in Patent Document 1, when a high load is applied to the rotation shaft during a vehicle collision or the like, the function of the clamp mechanism is caused by the displacement of the rotation shaft or the deformation of the clamp receiving portion. Decreases, the webbing clamping force weakens, and the webbing may move. For this reason, this problem has been addressed by increasing the rigidity of the rotating shaft and the like. However, since the strengthening of the rigidity of the rotating shaft leads to an increase in the size and weight of the locking tongue, further improvement of the clamping performance is required without increasing the rigidity of the rotating shaft.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a locking tongue and a seat belt capable of improving the clamping performance at the time of a vehicle collision without increasing the rigidity of the rotation shaft of the lock member. To provide an apparatus.

The above object of the present invention can be achieved by the following constitution.
(1) A tongue body that can be coupled to the buckle and has a webbing insertion hole through which the webbing is inserted;
A locking member fixed to the rotating shaft and held by the tongue main body so as to be rotatable in the webbing insertion hole;
A locking tongue that prevents the movement of the webbing by clamping the webbing inserted into the webbing insertion hole by rotating the lock member,
The lock member has a short radius portion whose outer cross section is a convex curve with a short distance from the center of the rotation axis, and a long curve from the center of the rotation shaft which is longer than the short radius portion. With a long radius part,
The short radius portion is configured to clamp the webbing with one surface constituting the webbing insertion hole by rotating the lock member in a predetermined direction by the webbing during normal use. Provided on the locking member,
The long radius portion is deformed and moved in the direction in which the rotation axis of the lock member is pulled by the webbing when a force of a predetermined value or more is applied to the webbing, and the webbing is moved by the webbing. The gap between the lock member further rotated in the predetermined direction and the one surface constituting the webbing insertion hole is between the short radius portion in normal use and the one surface constituting the webbing insertion hole. Configured to be smaller than the gap between, provided on the lock member to clamp the webbing ,
One surface which comprises the said webbing penetration hole is a substantially plane or a convex curved surface, The rocking tongue characterized by the above-mentioned.
(2) In an initial state in which a force from the webbing is not applied to the lock member, the short radius portion is located closer to one surface constituting the webbing insertion hole than the long radius portion (1) Rocking tongue as described in).
(3) Between the said short radius part and the said long radius part, the distance from the center of the said rotating shaft becomes long gradually from the said short radius part to the said long radius part, and the external cross section is a convex curve. The locking tongue according to (1) or (2), which is connected by a relaxation curve portion.
(4) The lock member is further provided near the lap side opening of the webbing insertion hole with respect to the center of the rotation shaft, and receives a force acting on the webbing to rotate the lock member. With
The rocking tongue according to any one of (1) to (3), wherein the short radius part and the long radius part are located in a shoulder side opening of the webbing insertion hole with respect to a center of the rotating shaft.
(5) The tongue main body has a metal tongue plate and a resin mold that partially covers the tongue plate and forms the webbing insertion hole,
The resin mold includes an opening side portion near the opening of the tongue plate, and a folded portion where the webbing is folded,
The webbing insertion hole is configured by mutually facing surfaces of the opening side portion and the folded portion,
The rocking tongue according to any one of (1) to (4), wherein the short radius part and the long radius part clamp the webbing between an upper surface of the opening side part.
(6) A seat belt device comprising the locking tongue according to any one of (1) to (5).

According to the locking tongue of the present invention, the lock member that is rotatably held in the webbing insertion hole of the tongue main body has a short radius portion that has a short distance from the center of the rotation axis and whose outer cross section is a convex curved surface. A long radius portion having a convex outer curved surface and a longer distance from the center of the rotation axis than the short radius portion. And a short radius part is provided in a locking member so that a webbing may be clamped between one surface which comprises a webbing penetration hole, when a locking member rotates to a predetermined direction by webbing. Further, the long radius portion is a force when a force greater than a predetermined value is applied to the webbing as in the case of a vehicle collision, and the rotation shaft of the lock member is deformed and moved in the direction pulled by the webbing, and the lock member moves in the direction pulled. The gap between the lock member further rotated in a predetermined direction by the webbing and one surface constituting the webbing insertion hole is between the short radius portion in normal use and the one surface constituting the webbing insertion hole. The lock member is configured to be smaller than the gap and is clamped to clamp the webbing. Furthermore, one surface constituting the webbing insertion hole is a substantially flat surface or a convex curved surface. As a result, even during a vehicle collision in which the rotation shaft of the lock member is deformed and moved, the clamping force of the webbing by the lock member is maintained, and the clamping performance at the time of the vehicle collision is increased without increasing the rigidity of the rotation shaft of the lock member. Can be improved.

It is the perspective view which showed typically an example of the seatbelt apparatus provided with the locking tongue by this invention. It is a perspective view of a locking tongue. (A) is sectional drawing of a locking tongue, (b) is a principal part enlarged view of the part enclosed by III of Fig.3 (a). It is a figure for demonstrating the effect | action of a locking tongue, (a) is sectional drawing of the locking tongue of the initial state in which webbing is not restrained by the locking member, (b) is a short radius part of a locking member, and webbing insertion Sectional view of a locking tongue in a normal use state in which the webbing is clamped between the surface of the hole, and (c) is a view showing that the rotation shaft of the lock member is locked when a force exceeding a predetermined value acts on the webbing in an emergency of the vehicle. Along with the movement of the entire member, the member is slightly deformed and moved in the moving direction, and the lock member is further rotated to clamp the webbing between the long radius portion of the lock member and the surface of the webbing insertion hole. It is sectional drawing of the locking tongue of a state.

  Hereinafter, a locking tongue according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an example of a three-point seat belt device 1 to which a locking tongue 10 is applied. The seat belt apparatus 1 includes a retractor 2 attached to a floor on one side with respect to a vehicle seat (not shown). One end of the webbing 3 is wound around a spring-biased inertia reel inside the retractor 2, and the other end of the webbing 3 is fixed to the vehicle body by a lap anchor 4. A locking tongue 10 is slidably provided on the webbing 3, and the locking tongue 10 is detachably coupled to a buckle 7 provided on the opposite side of the retractor 2 with respect to the seat.

  The webbing 3 extends substantially vertically upward from the retractor 2 to the shoulder anchor 5. The webbing 3 extends obliquely downward from the shoulder anchor 5 to the buckle 7 and constitutes a shoulder belt 6 that is slanted from the shoulder portion to the waist portion of the occupant. Furthermore, the webbing 3 extends in the vehicle width direction from the buckle 7 to the lap anchor 4 and constitutes a lap belt 8 straddling the occupant's waist.

  As shown in FIGS. 2 and 3, the locking tongue 10 can be coupled to the buckle 7, and can be rotated within the tongue main body 11 having the webbing insertion hole 12 through which the webbing 3 is inserted, and the webbing insertion hole 12. And a lock member 30 held by the tongue main body 11. Then, the locking tongue 10 rotates the locking member 30 in a predetermined direction (clockwise in FIG. 3), so that the webbing 3 inserted into the webbing insertion hole 12 is moved to the locking member 30 (the short radius portion 35, the relaxation curve). The portion 37 or the long radius portion 36) and the one surface 24 constituting the webbing insertion hole 12 are clamped to prevent the webbing 3 from moving.

  The tongue main body 11 includes a metal tongue plate 15 and a resin mold portion 20 that partially covers the tongue plate 15 and forms the webbing insertion hole 12. The tongue plate 15 is formed in a substantially T shape by pressing a metal plate material or the like, and has a width direction hole end face 16 along the width direction in a wide portion of the tongue plate 15. An opening 17 that engages with a locking element (not shown) provided inside the buckle 7 is formed in the narrow portion of the tongue plate 15.

The resin mold portion 20 is formed to cover the wide portion of the tongue plate 15 including the periphery of the width direction hole end surface 16. The resin mold part 20 covers the opening part 21 formed near the opening part 17, the blank 18 of the tongue plate 15, the folded part 22 where the webbing 3 is folded, and both sides in the width direction of the webbing insertion hole 12. A pair of connecting portions 23 that connect the opening-side portion 21 and the folded-back portion 22. Accordingly, the webbing insertion hole 12 is configured by the upper surface 24 of the opening side portion 21, the lower surface 25 of the folded portion 22, and the inner side surfaces 26 and 26 of the pair of connecting portions 23.
In addition, although the upper surface (one surface which comprises the webbing penetration hole 12) 24 of the opening part 21 is substantially flat, it is not limited to this, For example, a convex curve may be sufficient.

  Both ends of the lock member 30 are fixed to a rotating shaft 32 that fits into support holes (not shown) formed on the inner side surfaces 26 and 26 of the pair of connecting portions 23 of the resin mold portion 20. The lock member 30 is rotatably disposed in the webbing insertion hole 12.

  The lock member 30 is provided with a webbing lock portion 33 near the shoulder side opening 12a of the webbing insertion hole 12 with respect to the center O of the rotation shaft 32, and a pressing arm portion 34 near the lap side opening 12b. The webbing lock portion 33 rotates around the rotation shaft 32 when the occupant wears the webbing, and forms a gap close to the thickness of the webbing with the upper surface 24 of the opening side portion of the resin mold portion 20. It is the part which clamps.

  The webbing lock portion 33 includes a short radius portion 35 formed of a convex curved surface having a shortest distance from the center O of the rotation shaft 32 including the distance R1, and a circumferential direction spaced from the short radius portion 35 in a counterclockwise direction. A long radius portion 36 formed by a convex curved surface formed at a position and including a distance R2 having a longest distance from the center O of the rotating shaft 32 longer than a shortest distance R1 of the short radius portion 35; And a relaxation curve portion 37 whose outer cross section provided between the long radius portion 36 and the long radius portion 36 is a convex curved surface.

  The distance R1 of the short radius portion 35 is the length of the difference (Bt) between the shortest distance B between the center O of the rotating shaft 32 and the upper surface 24 of the opening portion 21 and the webbing thickness t (see FIG. 4). It is almost the same and slightly longer. Thereby, the webbing 3 can be weakly clamped between the upper surface 24 of the opening side portion 21 and the short radius part 35 during normal use.

  The relaxation curve portion 37 has a distance between the short radius portion 35 and the long radius portion 36 such that the distance from the center O of the rotating shaft 32 becomes longer gradually from the short radius portion 35 toward the long radius portion 36. It is formed by a convexly curved section that connects smoothly.

  A distance R from the center O of the rotation shaft 32 to the outermost peripheral portion of the pressing arm portion 34 is set to be longer than the length R2 of the long radius portion 36. Note that a torsion coil spring or the like that biases the webbing lock portion 33 away from the upper surface 24 of the opening side portion 21 (counterclockwise in the figure) is provided between the lock member 30 and the resin mold portion 20. A biasing means may be provided.

  The webbing 3 is inserted through the webbing insertion hole 12 so as to pass between the lock member 30 and the upper surface 24 of the opening side portion 21.

  In the seat belt device 1 configured as described above, the webbing 3 is pulled out in a state in which the locking tongue 10 is gripped by an occupant seated on the seat, and the locking tongue 10 is attached to the buckle 7, whereby the shoulder of the webbing 3. The belt 6 is stretched diagonally from the occupant's shoulder to the waist, and the lap belt 8 is attached to the occupant's waist from the front side.

  Further, as shown in FIG. 4A, in an initial state where no tension is applied to the webbing 3, for example, in a state where the locking tongue 10 is not engaged with the buckle 7, the webbing lock portion 33 and the opening side portion A gap larger than the thickness t of the webbing 3 is formed between the upper surface 24 of 21. Accordingly, the webbing 3 is not restrained (clamped) by the lock member 30 and can freely move in the webbing insertion hole 12.

  When the locking tongue 10 is engaged with the buckle 7 and a weak tension (for example, a load of about 2 kN) acts on the webbing 3, the pressing arm portion of the locking member 30 is used as shown in FIG. When the tension of the webbing 3 acts on 34, a rotation moment is generated in the lock member 30, and the lock member 30 rotates clockwise (predetermined direction).

  The tension of the webbing 3 simultaneously acts on the webbing lock portion 33 of the lock member 30, but the distance R from the rotation center of the pressing arm portion 34 is the shortest distance from the rotation center of the short radius portion 35 of the webbing lock portion 33. Since it is longer than the longest distance R2 from the rotation center of R1 and the long radius part 36, the rotational moment by the pressing arm part 34 becomes large, and the lock member 30 rotates clockwise.

  Then, the webbing 3 is clamped with a weak force between the short radius portion 35 and the upper surface 24 of the opening side portion 21. At this time, since the clamping force of the webbing 3 is weak, the passenger does not feel uncomfortable feeling such as restraint.

  As shown in FIG. 4C, when the locking tongue 10 is attached to the buckle 7, a force greater than a predetermined value (for example, a load of about 7 kN) is applied to the webbing 3 in the event of a vehicle collision (during emergency locking). When the lock member 30 is acted, the rotational moment acting on the pressing arm 34 is increased by the tension of the webbing 3, while the lock member 30 itself tends to move slightly in the direction pulled by the webbing (upward in the drawing). . Thereby, the rotating shaft 32 is also elastically deformed slightly upward (in the direction of the folded portion 22).

  The clearance between the webbing lock portion 33 and the upper surface 24 of the opening-side portion 21 is slightly increased by a slight upward movement of the lock member 30 due to the upward deformation movement of the rotation shaft 32. However, the locking member 30 is further rotated in the clockwise direction by the rotational moment acting on the pressing arm portion 34, and exceeds the relaxation curve portion 37, which is larger in distance from the rotation center than the shortest distance R 1 of the short radius portion 35. The long radius portion 36 including the portion having the longest distance from the rotation center in the webbing lock portion 33 clamps the webbing 3 with the upper surface 24 of the opening side portion 21. At this time, the long radius portion 36 is large enough to sufficiently cover a slight movement distance of the rotating shaft 32 above, so that the gap between the long radius portion 36 and the upper surface 24 at this time is sufficient. Can be made smaller than the gap between the short radius portion 35 and the upper surface 24 in normal use (FIG. 4B). Thereby, the webbing 3 is clamped with a stronger force than in normal use.

As a result, the webbing 3 is clamped while maintaining the clamping force while the lock member 30 rotates during a vehicle collision or the like, so that the occupant can be reliably protected.
The upper surface 24 of the opening side portion 21 is pressed by the webbing lock portion 33 and is elastically deformed in a slightly recessed direction. However, even if there is a dent due to the deformation of the upper surface 24, the locking tongue 10 of the present invention has a gap between the long radius portion 36 and the upper surface 24 as described above during normal use (FIG. 4B). The short radius portion 35 and the upper surface 24 are configured to be smaller than the gap.

  Therefore, even if the tension on the lap belt 8 side increases, the webbing 3 is restrained by the lock member 30, so that the tension on the lap belt 8 side is not transmitted to the shoulder belt 6 side. When the belt is pulled out on the shoulder side in an emergency such as when the load limiter is operated, the webbing 3 on the lap side is locked, so that all the pulled out webbing 3 is used on the shoulder side. Accordingly, it is possible to avoid unnecessary pressure on the occupant chest by the webbing 3.

As described above, according to the locking tongue 10 of the present embodiment, the lock member 30 that is rotatably held in the webbing insertion hole 12 of the tongue main body 11 has the distance R1 from the center O of the rotation shaft 32 thereof. A short radius part 35 whose outer cross section is a convex curved surface, and a long radius part 36 whose outer cross section is a convex curved surface whose distance R2 from the center O of the rotating shaft 32 is long. And the short radius part 35 clamps the webbing 3 between the one surface 24 which comprises the webbing penetration hole 12 by the lock member 30 turning to a predetermined direction by the webbing 3 at the time of normal use. Thus, the lock member 30 is provided. The long radius portion 36 forms the webbing insertion hole 12 by further rotating the lock member 30 in a predetermined direction by the webbing 3 when a force of a predetermined value or more is applied to the webbing at the time of a vehicle collision. The locking member 30 is provided so as to strongly clamp the webbing 3 between the first surface 24 and the second surface 24.
As a result, even during a vehicle collision in which the rotation shaft 32 of the lock member 30 is deformed and moved, the lock member 30 is further rotated to maintain the clamping force of the webbing 3 by the lock member 30. Clamping performance at the time of vehicle collision is improved without increasing the rigidity of the rotating shaft 32.

  In the initial state where the force from the webbing 3 is not applied to the lock member 30, the short radius portion 35 is positioned closer to the surface 24 of the webbing insertion hole 12 than the long radius portion 36. The webbing 3 can be freely moved in the insertion hole 12 and can be immediately clamped between the short radius portion 35 of the lock member 30 and the surface 24 of the webbing insertion hole 12 when tension is applied to the webbing 3. .

  In addition, between the short radius portion 35 and the long radius portion 36, the distance from the center O of the rotating shaft 32 becomes continuously longer from the short radius portion 35 to the long radius portion 36, and the outer cross section is a convex curved surface. Since it is connected by a certain relaxation curve portion 37, the clamping force can be maintained until the webbing 3 is clamped by the long radius portion 36, such as at the time of a vehicle collision.

  The lock member 30 is further provided near the lap side opening 12b of the webbing insertion hole 12 with respect to the center O of the rotary shaft 32, and receives a force acting on the webbing 3 to rotate the lock member 30. The webbing lock portion 33 has a short radius portion 35 and a long radius portion 36 that are located in the shoulder-side opening 12a of the webbing insertion hole 12 with respect to the center O of the rotation shaft 32, so that the webbing 3 is tensioned. When acting, the short radius part 35 and the long radius part 36 of the webbing lock part 33 rotate in a direction approaching one surface 24 constituting the webbing insertion hole 12.

  Moreover, since the seatbelt apparatus 1 is provided with said locking tongue 10, it can protect a passenger | crew reliably because the locking tongue 10 clamps the webbing 3. FIG.

  In addition, this invention is not limited to embodiment mentioned above, Of course, various improvement and deformation | transformation may be performed suitably in the range which does not deviate from the summary of this invention.

DESCRIPTION OF SYMBOLS 1 Seat belt apparatus 3 Webbing 7 Buckle 10 Locking tongue 11 Tongue main body 12 Webbing insertion hole 12a Shoulder side opening 12b Lap side opening 24 Upper surface (surface which comprises webbing insertion hole)
30 Locking member 32 Rotating shaft (Rotating shaft)
34 Pressing arm portion 35 Short radius portion 36 Long radius portion 37 Relaxation curve portion O Center of rotation axis R1 Distance of short radius portion (distance from center of rotation axis)
R2 Long radius part distance (distance from the center of the rotation axis)

Claims (6)

A tongue body that is connectable to the buckle and has a webbing insertion hole through which the webbing is inserted;
A locking member fixed to the rotating shaft and held by the tongue main body so as to be rotatable in the webbing insertion hole;
A locking tongue that prevents the movement of the webbing by clamping the webbing inserted into the webbing insertion hole by rotating the lock member,
The lock member has a short radius portion whose outer cross section is a convex curve with a short distance from the center of the rotation axis, and a long curve from the center of the rotation shaft which is longer than the short radius portion. With a long radius part,
The short radius portion is configured to clamp the webbing with one surface constituting the webbing insertion hole by rotating the lock member in a predetermined direction by the webbing during normal use. Provided on the locking member,
The long radius portion is deformed and moved in the direction in which the rotation axis of the lock member is pulled by the webbing when a force of a predetermined value or more is applied to the webbing, and the webbing is moved by the webbing. The gap between the lock member further rotated in the predetermined direction and the one surface constituting the webbing insertion hole is between the short radius portion in normal use and the one surface constituting the webbing insertion hole. Configured to be smaller than the gap between, provided on the lock member to clamp the webbing ,
One surface which comprises the said webbing penetration hole is a substantially plane or a convex curved surface, The rocking tongue characterized by the above-mentioned.   2. The initial state in which a force from the webbing is not applied to the lock member, the short radius portion is located closer to one surface constituting the webbing insertion hole than the long radius portion. Rocking tongue.   Between the short radius part and the long radius part, the distance from the center of the rotation axis becomes gradually longer from the short radius part to the long radius part. The locking tongue according to claim 1 or 2, wherein the locking tongue is connected by. The lock member is further provided near the lap side opening of the webbing insertion hole with respect to the center of the rotating shaft, and includes a pressing arm portion that receives the force acting on the webbing and rotates the lock member.
The rocking tongue according to any one of claims 1 to 3, wherein the short radius portion and the long radius portion are located in a shoulder side opening of the webbing insertion hole with respect to a center of the rotation shaft. The tongue body has a metal tongue plate and a resin mold that partially covers the tongue plate and forms the webbing insertion hole,
The resin mold includes an opening side portion near the opening of the tongue plate, and a folded portion where the webbing is folded,
The webbing insertion hole is configured by mutually facing surfaces of the opening side portion and the folded portion,
5. The locking tongue according to claim 1, wherein the short radius portion and the long radius portion clamp the webbing between the upper radius portion and the upper surface of the opening side portion.   A seat belt device comprising the locking tongue according to any one of claims 1 to 5.

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