JP6566761B2 - Tongue and seat belt device - Google Patents

Description

  The present invention relates to a tongue and a seat belt device.

  Conventionally, a tongue that locks the drawer of the seat belt by sandwiching the seat belt between the lock bar and the plate is known (for example, see Patent Document 1).

U.S. Pat. No. 8474106

  However, in the prior art, in order to lock the seat belt, a part such as a lock bar is required separately from the plate, so that the number of tongue parts tends to increase. Accordingly, it is an object of the present invention to provide a tongue and a seat belt device that do not easily increase the number of parts.

One idea is that
A plate having a longitudinal part that can be inserted into a buckle and a wide part formed wider than the longitudinal part on the side opposite to the tip part of the longitudinal part, and at least a part of the wide part being covered With
The wide part is
A base connected to the longitudinal portion;
A beam portion that is offset with respect to the base and extends in the longitudinal direction of the wide portion;
A connecting portion connecting the base portion and the beam portion;
By the beam portion is pulled by the tension force acting in the direction drawn from the retractor to the seat belt wound around the beam portion, said beam portion acts closer Keru frictional force to the base portion, the connection By bending the portion, the tongue is provided in which the beam portion approaches the base portion and the seat belt is sandwiched and locked between the beam portion and the base portion.

  According to one aspect, the seat belt is locked by deformation of the connecting portion which is a part of the plate. Therefore, parts such as a lock bar are not necessary, and the number of tongue parts can be reduced.

It is a figure which shows an example of a seatbelt apparatus provided with a tongue. It is a perspective view which shows the inner side of an example of a tongue. It is a perspective view which shows the outer side of an example of a tongue. It is a disassembled perspective view which shows an example of a tongue. It is a top view which shows an example of a plate. It is an arrow view by arrow view A shown by FIG. It is a side view which shows an example of the initial position state of a beam part in the tongue before a seat belt is wound around a beam part. It is sectional drawing which shows an example of the initial position state of a beam part in the tongue after a seatbelt was wound around the beam part. It is sectional drawing which shows an example of the lock position state of a beam part in the tongue after a seatbelt was wound around the beam part. It is a figure which shows an example of the form before and behind which a plate deform | transforms with tensile force. It is a figure which shows an example of the result of having measured the relationship between tensile force and the gap length of an insertion port.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. “Parallel” may include “substantially parallel”, and “vertical” may include “substantially vertical”.

  FIG. 1 is a diagram illustrating an example of a seat belt device 1 according to an embodiment. The seat belt device 1 includes a seat belt 4, a retractor 3, a shoulder anchor 6, a tongue 7, and a buckle 8.

  The seat belt 4 is an example of webbing that restrains an occupant sitting on the seat 2 of the vehicle, and is a belt-like member that is wound around the retractor 3 so as to be drawn out. The belt anchor 5 at the tip of the seat belt 4 is fixed to the floor of the vehicle body or the seat 2.

  The retractor 3 is an example of a take-up device that enables the seat belt 4 to be taken up or pulled out, and the seat belt 4 is pulled out from the retractor 3 when a deceleration of a predetermined value or more is applied to the vehicle during a vehicle collision or the like. Limit that. The retractor 3 is fixed to the seat 2 or a vehicle body near the seat 2.

  The shoulder anchor 6 is an example of a belt insertion tool through which the seat belt 4 is inserted, and is a member that guides the seat belt 4 pulled out from the retractor 3 toward the shoulder portion of the occupant.

  The tongue 7 is an example of a belt insertion tool through which the seat belt 4 is inserted, and is a member that is slidably attached to the seat belt 4 guided by the shoulder anchor 6.

  The buckle 8 is an example of a member to which the tongue 7 is detachably engaged, and is fixed to the floor of the vehicle body or the seat 2.

  In a state where the tongue 7 is engaged with the buckle 8, the portion of the seat belt 4 between the shoulder anchor 6 and the tongue 7 is a shoulder belt portion 9 that restrains the chest and shoulders of the occupant. In a state where the tongue 7 is engaged with the buckle 8, the portion of the seat belt 4 between the belt anchor 5 and the tongue 7 is a lap belt portion 10 that restrains the occupant's waist.

  When the seatbelt 4 is not worn by the occupant, the tongue 7 is not engaged with the buckle 8, and the seatbelt 4 is fully engaged (specifically, the retractor 3 has no trouble with the seatbelt 4). The retractable amount is wound on the retractor 3. On the other hand, when the seat belt 4 is worn by the occupant, the seat belt 4 is pulled out from the retractor 3 as shown in FIG. Then, the seat belt 4 is wound on the retractor 3 so that the tongue 7 is engaged with the buckle 8 and the slack of the seat belt 4 is reduced, so that the seat belt 4 is mounted on the occupant.

  In a state where the tongue 7 is engaged with the buckle 8 and the seat belt 4 is attached to the occupant, the seat belt 4 is operated at a normal pulling speed at a normal time when a deceleration of a predetermined value or more is not applied to the vehicle such as a vehicle collision. It can be pulled out freely. When the pulling force in the pull-out direction of the seat belt 4 is released, the extra pull-out amount of the seat belt 4 is taken up by the retractor 3.

  In the state where the tongue 7 is engaged with the buckle 8 and the seat belt 4 is attached to the occupant, the retractor 3 has the seat belt 4 with the retractor 3 in the event of an emergency in which a deceleration greater than a predetermined value is applied to the vehicle, such as during a vehicle collision. By locking or winding up the seat belt 4 so as to restrict the seat belt 4 from being pulled out, the restraining force of the seat belt 4 on the occupant is strengthened.

  FIG. 2 is a perspective view showing the inside of the tongue 7. FIG. 3 is a perspective view showing the outside of the tongue 7. 2 and 3, the illustration of the seat belt 4 that is inserted through the insertion port 71 provided in the tongue 7 is omitted.

  FIG. 4 is an exploded perspective view of the tongue 7. The tongue 7 includes a plate 20 and a folding member 40. A part of the plate 20 is covered with a covering portion 70 formed of resin or the like.

  The plate 20 is a flat plate member that has a longitudinal portion 21 that can be inserted into the buckle 8 and a wide portion 22 that is formed wider than the longitudinal portion 21 and is formed in a substantially T shape. The tongue 7 is connected to the buckle 8 through the plate 20 by inserting the longitudinal portion 21 into the buckle 8. The plate 20 is formed, for example, by pressing from a single metal plate mainly composed of carbon steel.

  The longitudinal portion 21 is a flat plate portion that can be engaged with the buckle 8, and extends from the wide portion 22 to the distal end portion 24 in the first direction 11. The first direction 11 corresponds to the longitudinal direction of the longitudinal portion 21. The longitudinal portion 21 has an outer edge including a pair of long sides 31 and one short side 32. The pair of long sides 31 are outer edges extending from the wide portion 22 in the first direction 11. The short side 32 is an outer edge that extends in the short direction (second direction 12) of the long portion 21, and is the outer edge of the distal end portion 24 in the first direction 11. The second direction 12 corresponds to the width direction of the longitudinal portion 21.

  In the longitudinal portion 21, a latch hole 26 for latching with the latch member of the buckle 8 is provided between the tip portion 24 and the wide portion 22. A reduction hole 27 for reducing the weight of the plate 20 may be provided in the longitudinal portion 21 between the tip portion 24 and the wide portion 22.

  The wide portion 22 is a plate portion formed on the opposite side of the distal end portion 24 of the longitudinal portion 21 in the first direction 11. The wide portion 22 has the second direction 12 as the longitudinal direction. The wide part 22 includes a base part 23, a beam part 25, and a connection part 39.

  The base portion 23 is a planar plate portion that is connected to the base portion on the opposite side of the distal end portion 24 of the longitudinal portion 21 in the first direction 11 and is wider than the longitudinal portion 21. The base 23 has the second direction 12 as a longitudinal direction. The base 23 has an end including a first side end 33 and a second side end 34. The first side end portion 33 is one end portion in the second direction 12. The second side end 34 is the other end opposite to the first side end 33 in the second direction 12.

  The beam portion 25 is a planar plate portion extending in the longitudinal direction of the wide portion 22 (that is, the second direction 12). The beam portion 25 has the second direction 12 as a longitudinal direction. The beam portion 25 is provided offset to the opposite side of the longitudinal portion 21 with respect to the base portion 23, and offset to one side of the third direction 13 with respect to the base portion 23. The third direction 13 is a direction perpendicular to the first direction 11 and the second direction 12. The beam portion 25 has an end portion including a first beam end portion 35 and a second beam end portion 36. The first beam end portion 35 is one end portion in the second direction 12. The second beam end portion 36 is the other end portion opposite to the first beam end portion 35 in the second direction 12.

  The connecting portion 39 is a flat plate portion that connects the base portion 23 and the beam portion 25, and is a portion that is bent into a crank shape. For example, the connecting portion 39 includes a first arm portion 29 formed in a crank shape and a second arm portion 30 formed in a crank shape. The first arm portion 29 is a connection portion that connects the first side end portion 33 and the first beam end portion 35, and the second arm portion 30 is the second side end portion 34 and the second beam end portion 35. It is a connection part which connects the beam end part 36 of this.

  FIG. 5 is a plan view of the plate 20 in the third direction 13. FIG. 6 is a view taken in the direction of arrow A shown in FIG. The insertion opening 71 is an opening surrounded by the first arm portion 29, the second arm portion 30, the base portion 23, and the beam portion 25. The insertion opening 71 is formed between the first arm portion 29 and the second arm portion 30 and is formed between the base portion 23 and the beam portion 25 from the viewpoint in the first direction 11. . The insertion opening 71 opens so that the seat belt 4 can be inserted in the first direction 11.

  In FIG. 4, at least a part of the wide part 22 and at least a part of the folding member 40 are covered with a covering part 70. The covering portion 70 is, for example, a mold portion that mold-coats at least a portion of the wide portion 22 and at least a portion of the folded member 40 with resin or the like. The covering portion 70 covers the base portion 23, the beam portion 25, and the connecting portion 39 so that the insertion port 71 is not blocked (that is, the seat belt 4 can be inserted through the insertion port 71).

  The folding member 40 is a bar-shaped plate member that is bent into a substantially U shape and has a slide surface 41 that folds and slides the seat belt 4. The slide surface 41 is formed on the outer peripheral surface of the folding member 40. The folding member 40 is fixed to the beam portion 25 by mold coating of the covering portion 70 while being disposed between the first arm portion 29 and the second arm portion 30. The folding member 40 has the second direction 12 as the longitudinal direction. For example, the folded member 40 is formed by pressing from a single metal plate mainly composed of carbon steel. Specific examples of the main component of the folded member 40 include iron, aluminum, and resin.

  FIG. 7 is a side view showing an example of an initial position state of the beam portion 25 in the tongue 7 before the seat belt 4 is wound around the beam portion 25. FIG. 7 shows a non-mounted state where the seat belt 4 is not mounted on the occupant. In this state, the seat belt 4 is wound around the retractor 3 and is not wound around the beam portion 25.

  FIG. 7 shows a form in which the base portion 23, the beam portion 25, and the connection portion 39 are covered with the covering portion 70. The same applies to FIGS. 8 and 9 described later. That is, in this example, the seat belt 4 is wound around the beam portion 25 covered with the covering portion 70.

  In FIG. 7, the seat belt 4 is not folded back by the tongue 7, but is inserted straight through the tongue 7 through the insertion opening 71 between the base portion 23 and the beam portion 25. The base portion 23 is mold-coated with a covering portion 70 so that a linear passage through which the seat belt 4 passes is formed. As a result, the tongue 7 can smoothly fall freely along the seat belt 4.

  FIG. 8 is a cross-sectional view showing an example of an initial position state of the beam portion 25 in the tongue 7 after the seat belt 4 is wound around the beam portion 25. FIG. 8 shows a mounting state in which the seat belt 4 is mounted on the occupant. As shown in FIG. 8, the seat belt 4 has a folded portion so that the beam portion 25 is sandwiched between the shoulder belt portion 9 and the lap belt portion 10 in a state where the seat belt 4 is passed through the insertion port 71 and wound around the beam portion 25. It is folded at 37. The folded portion 37 is a portion of the covering portion 70 that covers the beam portion 25.

  The folding member 40 is a guide member that smoothly guides the operation of the seat belt 4 that slides on the sliding surface 41 folding back at the beam portion 25. The folding member 40 is fixed to the beam portion 25 by the mold coating of the covering portion 70 at the folding portion 37 so that the slide surface 41 curved in a substantially U shape is exposed. Further, the substantially U-shaped folding member 40 is fixed to the beam portion 25 by mold coating of the covering portion 70 so as to sandwich the beam portion 25.

  The longitudinal portion 21 is fixed to the buckle 8 in the state shown in FIG. Therefore, when the lap belt portion 10 is pulled by the pulling force Fp in the pull-out direction of the seat belt 4, the beam portion 25 is pulled to the opposite side of the longitudinal portion 21 with respect to the base portion 23 in the first direction 11. The pulling force Fp is a force that acts on the seat belt 4 in the direction in which the seat belt 4 is pulled out from the retractor 3.

  The beam portion 25 is offset from the base portion 23 in the first direction 11 and the third direction 13. Therefore, when the beam portion 25 is pulled by the pulling force Fp, the frictional force that brings the beam portion 25 close to the base portion 23 is likely to act on the slide surface 41 of the folding member 40 with which the seat belt 4 is slidably contacted. The connecting portion 39 bends so that the beam portion 25 approaches the base portion 23 by the frictional force that brings the beam portion 25 close to the base portion 23 acting on the slide surface 41 of the folding member 40.

  FIG. 9 is a cross-sectional view showing an example of a locked position state of the beam portion 25 in the tongue 7 after the seat belt 4 is wound around the beam portion 25. When the action of the pulling force Fp continues, the beam portion 25 sandwiches the seat belt 4 between one portion of the slide surface 41 and the clamp surface 38 formed on the base portion 23. Thereby, the drawer of the seat belt 4 is locked by the beam portion 25.

  The clamp surface 38 is formed by the base 23 being mold-coated. As a result, the force for clamping the seat belt 4 between the slide surface 41 and the clamp surface 38 can be received by the metal base 23, so that the rigidity of the tongue 7 with respect to the pulling force Fp is increased. The clamp surface 38 may be formed in a waveform, for example. Thereby, the force which pinches | interposes and locks the seatbelt 4 with the slide surface 41 and the clamp surface 38 can be strengthened.

  8 and 9, when the lap belt portion 10 is pulled by the pulling force Fp in the pulling direction of the seat belt 4 and the shoulder belt portion 9 is pulled by the pulling force Fr in the winding direction of the seat belt 4, 25 may be pulled in the first direction 11 with respect to the base 23 opposite to the longitudinal portion 21. The pulling force Fr is a force that acts on the seat belt 4 in the direction in which the seat belt 4 is wound around the retractor 3. Similar to the above-described case where only the lap belt portion 10 is pulled by the pulling force Fp, the frictional force that brings the beam portion 25 close to the base portion 23 acts on the slide surface 41 of the folding member 40 slidably contacting the seat belt 4. . The connecting portion 39 bends so that the beam portion 25 approaches the base portion 23 by the frictional force that brings the beam portion 25 close to the base portion 23 acting on the slide surface 41 of the folding member 40.

  Note that when only the shoulder belt portion 9 is pulled by the pulling force Fr, the frictional force that brings the beam portion 25 close to the base portion 23 hardly acts on the slide surface 41 of the folding member 40 slidably contacting the seat belt 4. That is, the connecting portion 39 hardly bends in the direction in which the beam portion 25 approaches the base portion 23. Therefore, in a region where the pretension function that generates the pulling force Fr that pulls the shoulder belt portion 9 in the winding direction is activated, the seat belt 4 is not sandwiched between the beam portion 25 and the base portion 23, and the pretension function is activated. Not disturbed.

  FIG. 10 is a view showing an example of the form before and after the deformation of the plate 20 by the pulling force Fp or the resultant force of the pulling force Fp and the pulling force Fr, and is an arrow view taken along the arrow B shown in FIG. is there. As shown in FIG. 10, the connecting portion 39 is bent by the pulling force. Due to the bending deformation due to the pulling force of the connecting portion 39, the beam portion 25 is displaced by a movement amount C <b> 1 in a direction approaching the base portion 23 in the third direction 13, and moves in a direction away from the longitudinal portion 21 in the first direction 11. Displace by the amount C2.

  FIG. 11 is a diagram illustrating an example of a result of actual measurement of the relationship between the pulling force F and the gap length D of the insertion opening 71. The pulling force F is a resultant force of the pulling force Fp and the pulling force Fr. The gap length D represents the clearance length of the insertion port 71 in the third direction 13. The measurement conditions in FIG. 11 are such that the initial value of the gap length D is d1, and the thickness of the seat belt 4 is 1.2 mm.

  The region where the tensile force F is 0 or more and less than f2 is an elastic region where the connecting portion 39 is elastically deformed. The region where the tensile force F is f2 or more is a plastic region where the connecting portion 39 undergoes plastic deformation. The boundary load value between the elastic region and the plastic region is f2.

  A region E1 in which the pulling force F is 0 or more and f1 or less is a region in which a pretension function that generates a pulling force Fr that pulls the shoulder belt portion 9 of the seat belt 4 in the winding direction operates (that is, a pulling force in the winding direction). This is a region where Fr occurs. In the region E1 where the pretension is ignited, the seat belt 4 is not sandwiched between the beam portion 25 and the base portion 23, so that the operation of the pretension function is not hindered. f1 is a load value smaller than f2.

  A region E2 in which the pulling force F is not less than f3 and not more than f4 is a region in which the seat belt 4 is sandwiched between the beam portion 25 and the base portion 23 due to deformation of the connecting portion 39.

  In addition, the collision has a form called a light collision in which the pretension function does not operate. In the case of a light collision, the tongue 7 needs to be usable without a problem even after the collision. The tensile force F generated at the time of a light collision is smaller than the boundary load value f2 between the elastic region and the plastic region. Therefore, according to the tongue 7 of this embodiment, the connection part 39 can be deformed in an elastic region without plastically deforming the connection part 39. That is, since the connection portion 39 after the light collision returns to the original shape, the tongue 7 can be continuously used after the collision as in the case before the collision.

  Thus, according to the present embodiment, when the lap belt portion 10 of the seat belt 4 wound around the beam portion 25 is pulled, the connection portion 39 is deformed so that the beam portion 25 approaches the base portion 23, The seat belt 4 is sandwiched between the beam portion 25 and the base portion 23 and locked. Therefore, parts such as a lock bar are not necessary, and the number of parts of the tongue 7 can be reduced.

  Further, by providing the folding member 40, the sectional moment of inertia of the tongue 7 can be increased and the rigidity of the tongue 7 can be increased as compared with the configuration without the folding member 40. For example, since the strength in the longitudinal direction (first direction 11) of the plate 20 increases, the physique of the wide portion 22 can be reduced, and as a result, the physique of the plate 20 can be reduced.

  Since the folding member 40 is provided, deformation of the wide portion 22 can be suppressed, so that the connection width G (see FIG. 5) of the connection portion 39 can be reduced, for example. As a result, the outer dimension of the plate 20 in the second direction 12 can be reduced. Further, since the deformation of the wide portion 22 can be suppressed, for example, it becomes easy to adjust the degree of deformation of the connecting portion 39 with respect to the pulling force F by design. For example, in the elastic region of FIG. 11, it becomes easy to adjust the reduction degree of the gap length D with respect to the pulling force F by design.

  In a normal use situation of the seat belt 4 in which a deceleration greater than a predetermined value is not applied to the vehicle, such as when a vehicle collides, the friction coefficient of the folding member 40 is lower than the friction coefficient of the resin. Therefore, by providing the folding member 40, it is possible to improve the sliding of the seat belt 4 during winding or pulling. In addition, in the event of an emergency in which a deceleration greater than a predetermined value is applied to the vehicle, such as during a vehicle collision, the folding member 40 is provided, so that the generation of frictional heat due to the seat belt 4 rubbing against the resin can be suppressed.

  As mentioned above, although the tongue and the seatbelt apparatus were demonstrated by embodiment, this invention is not limited to the said embodiment. Various modifications and improvements such as combinations and substitutions with some or all of the other embodiments are possible within the scope of the present invention.

  For example, the covering portion 70 may not cover at least a part of the connecting portion 39. Moreover, the folding | turning member 40 is not restricted to press work, You may manufacture by other manufacturing methods, such as a drawing process, casting, and injection molding. Moreover, the folding | returning member 40 and the beam part 25 are not restricted to the case where it fixes by mold coating, You may fix with other fixed forms, such as welding and a rivet joining.

DESCRIPTION OF SYMBOLS 1 Seat belt apparatus 2 Seat 3 Retractor 4 Seat belt 5 Belt anchor 6 Shoulder anchor 7 Tongue 8 Buckle 9 Shoulder belt part 10 Lap belt part 11 1st direction 12 2nd direction 13 3rd direction 20 Plate 21 Longitudinal part 22 Wide portion 23 Base portion 24 Front end portion 25 Beam portion 29 First arm portion 30 Second arm portion 31 Long side 32 Short side 37 Folded portion 38 Clamp surface 39 Connection portion 40 Folded member 70 Cover portion 71 Insertion port

Claims (4)

A plate having a longitudinal part that can be inserted into a buckle and a wide part formed wider than the longitudinal part on the side opposite to the tip part of the longitudinal part, and at least a part of the wide part being covered With
The wide part is
A base connected to the longitudinal portion;
A beam portion that is offset with respect to the base and extends in the longitudinal direction of the wide portion;
A connecting portion connecting the base portion and the beam portion;
By the beam portion is pulled by the tension force acting in the direction drawn from the retractor to the seat belt wound around the beam portion, said beam portion acts closer Keru frictional force to the base portion, the connection A tongue that is bent and locked so that the beam portion approaches the base and the seat belt is sandwiched between the beam and the base.   The tongue according to claim 1, wherein a folding member that folds and slides the seat belt is fixed to the beam portion. The connection portion includes a first arm portion that connects the base portion and the beam portion, and a second arm portion that connects the base portion and the beam portion,
The tongue according to claim 1 or 2, wherein an insertion port through which the seat belt is inserted is formed between the first arm portion and the second arm portion.   A seat belt device comprising: the tongue according to claim 1; the buckle; the seat belt; a retractor that winds up the seat belt; and a shoulder anchor through which the seat belt is inserted.

Images