JP2015044550A - Seat belt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat belt device capable of adding large tension to a webbing, and suppressing the enlargement of a tension adding device.SOLUTION: In a seat belt device 10, while a webbing 14 is installed to a body of an occupant, a rap belt 36 passes through a slit 64 formed on a roller 62 of a roller device 22. If the roller 62 rotates, the rap belt 36 is wound around the roller 62, and a shoulder belt 38 passes through a tongue 16 to move to the rap belt 36 side. Therefore, the rap belt 36 and the shoulder belt 38 are pulled.

Description

  The present invention relates to a seat belt device that restrains the body of an occupant seated on a seat by webbing.

  Some three-point seat belt devices can move a buckle forward and backward by a driving force of a motor (see Patent Document 1 below as an example). In such a seat belt device, for example, when the tongue is moved to the rear side of the seat together with the buckle from the state where the webbing is mounted on the occupant's body, the webbing is pulled, and the occupant's body is highly tensioned by the webbing. It can also be restrained in a state. However, in such a configuration, in order to increase the tension applied to the webbing, the movement range of the buckle must be increased, and the apparatus becomes larger.

Japanese Patent Laid-Open No. 2001-122076

  In view of the above facts, an object of the present invention is to provide a seat belt device that can apply a large tension to the webbing and suppress an increase in the size of the tension applying device.

  The seat belt device according to claim 1 is provided with a buckle provided on one side of a vehicle seat in a left-right direction, a tongue held by the buckle, and the tongue, and the tongue is held by the buckle. A webbing attached to the body of an occupant seated on the seat, and a roller provided on one side of the seat in the left-right direction. The roller winds the webbing by rotating the roller. A tension applying device that applies tension to the webbing.

  According to the seat belt device of the first aspect, the tension applying device has a roller provided on one side in the left-right direction of the sheet, and when the tension applying device rotates the roller, the webbing is wound around the roller. It is done. As a result, the tension applied to the webbing can be increased. In addition, since the tension applying device increases the tension applied to the webbing by rotating the roller, it is not necessary to move the roller to increase the tension applied to the webbing or the range of movement can be reduced, and the size of the tension applying device is increased. Can be suppressed.

  The seat belt device according to a second aspect is the seat belt device according to the first aspect, wherein the tension applying device limits the rotation of the roller by the tension of the webbing.

  According to the seat belt device of the second aspect, the tension applying device is held in a state where the webbing is wound around the roller in order to limit the rotation of the roller due to the webbing tension. This can restrict the webbing from moving from the roller.

  The seatbelt device according to a third aspect is the seatbelt device according to the first or second aspect, wherein the roller opens at one end in the axial direction of the roller and penetrates in the direction orthogonal to the axis of the roller. And a guiding device for guiding the webbing to the slit and inserting the slit into the slit.

  According to the seat belt device of the third aspect, the slit is formed in the roller of the tension applying device. The slit opens at one end in the axial direction of the roller and penetrates in the direction perpendicular to the axis of the roller. Further, the seat belt device includes a guide device, and the webbing is guided to the slit of the roller by the guide device and is inserted into the slit. For this reason, webbing can be wound around a roller by rotating the roller.

  The seat belt device according to claim 4 is the seat belt device according to claim 3, wherein when the tongue is held by the buckle, the guide device moves the buckle to the rear side of the seat. Webbing is inserted through the slit of the roller.

  According to the seat belt device of the fourth aspect, when the tongue is held by the buckle, the buckle is moved to the rear side of the seat by the guide device, and the webbing is inserted into the slit formed in the roller. For this reason, the webbing can be easily inserted into the slit.

  The seat belt device according to claim 5 is the seat belt device according to any one of claims 1 to 4, wherein one of the webbing is a shoulder belt rather than the tongue, and the tongue The other is a lap belt, and the buckle is moved by being pulled by the shoulder belt with a tensile load of a predetermined size or more in a state where the roller winds and holds the lap belt.

  According to the seat belt device of the fifth aspect, the buckle is moved by pulling the buckle onto the shoulder belt of the webbing with a tensile load of a predetermined size or more. For this reason, the tension of the shoulder belt can be reduced. The webbing lap belt is wound and held by a roller of a tension applying device. For this reason, even if a buckle moves, the reduction | decrease of the tension | tensile_strength of a lap belt can be suppressed.

  As described above, the seat belt device according to the present invention can apply a large tension to the webbing and can suppress an increase in the size of the tension applying apparatus.

It is a perspective view which shows the seatbelt apparatus which concerns on 1st Embodiment. It is a side view showing the seat belt device concerning a 1st embodiment. It is a perspective view which shows the tension | tensile_strength provision apparatus of the seatbelt apparatus which concerns on 1st Embodiment. 3A is a cross-sectional view taken along line 3-3 in FIG. 2, and FIG. 2A shows a state where the lap belt passes through the slit of the roller, and FIG. 2B shows that the roller rotates in the winding direction and winds the lap belt. (C) shows a state in which the suture of the connecting belt is broken and the buckle is moved upward. 4A is a cross-sectional view taken along line 4-4 of FIG. 4, in which FIG. 4A shows a state where the buckle is in the standby position, and FIG. 4B shows a state where the buckle has moved rearward to the webbing attachment position. Yes. It is a perspective view which shows the tension | tensile_strength provision apparatus of the seatbelt apparatus which concerns on 2nd Embodiment.

  Next, each embodiment of the present invention will be described with reference to FIGS. 1 to 5, the arrow FR indicates the front side of the seat 24 to which the seat belt devices 10 and 90 are applied, the arrow LF indicates the left side of the seat 24 to which the seat belt devices 10 and 90 are applied, and the arrow UP indicates the upper side of the seat 24 to which the seat belt devices 10 and 90 are applied. In the present embodiment, the left side of the sheet 24 is described as one side in the left-right direction of the sheet 24.

  Further, the seat belt devices 10 and 90 are applied to the seat 24 on the right front side of the vehicle (that is, the driver's seat if the vehicle is a right-hand drive specification and the passenger seat if the vehicle is a left-hand drive specification). For this reason, when the seat belt devices 10 and 90 are applied to the seats 24 other than the seat 24 on the right front side of the vehicle, the configuration of the seat belt devices 10 and 90 may be arranged in the left and right directions.

<Configuration of First Embodiment>
(Overall configuration of seat belt device 10)
As shown in FIGS. 1 and 2, the seat belt device 10 includes a webbing take-up device 12, a webbing 14, a tongue 16, a buckle 18, an assist device 20 as a guide device, and a roller device 22 as a tension applying device. It is configured to include.

  As shown in FIG. 2, the webbing take-up device 12 is provided on the lower right side of the seat 24 and is fixed to the vehicle body. The webbing take-up device 12 includes a spool 26, and the spool 26 is rotatably supported by the frame of the webbing take-up device 12. The longitudinal end of the webbing 14 is locked to the spool 26, and the webbing 14 is drawn upward from the spool 26. When the spool 26 rotates to one side around the central axis, the webbing 14 is wound around the spool 26.

  Further, the webbing take-up device 12 includes a lock mechanism (not shown), and when the lock mechanism is activated, the rotation of the spool 26 around the central axis is restricted. As a result, the withdrawal of the webbing 14 from the spool 26 is restricted. Furthermore, the webbing take-up device 12 includes a force limiter mechanism (not shown) configured to include a load absorbing member. In the force limiter mechanism, when a rotational force to the other side around the central axis exceeding a predetermined size is applied to the spool 26 in the operating state of the lock mechanism, the load absorbing member is deformed and the spool is deformed by the rotational force. 26 is rotated to the other around the central axis.

  A through anchor 28 is provided on the upper side of the webbing take-up device 12. The through anchor 28 is attached to a center pillar 30 that is a vehicle body side wall on the right side of the seat 24. A slit hole is formed in the through anchor 28, and the webbing 14 drawn from the spool 26 of the webbing take-up device 12 passes through the slit hole of the through anchor 28 and is folded downward. An anchor plate 32 is provided on the lower right side of the seat 24. The anchor plate 32 is fixed to the vehicle body or the frame of the seat 24, and the tip of the webbing 14 turned back by the through anchor 28 is locked to the anchor plate 32.

  The tongue 16 is provided between the anchor plate 32 and the through anchor 28 of the webbing 14. A slit hole is formed in the tongue 16, and the webbing 14 is inserted through the slit hole of the tongue 16. As a result, the tongue 16 can move along the webbing 14.

  As shown in FIGS. 1 and 2, the buckle 18 is fixed to the vehicle body or the frame of the seat 24 on the left side of the seat 24. The buckle 18 can insert the tongue 16 from above, and when the tongue 16 is inserted into the buckle 18, it is held by the buckle 18.

  As shown in FIGS. 1 and 2, when the tongue 16 is held by the buckle 18, the webbing 14 is attached to the body of an occupant 34 seated on the seat 24. In this state, a lap belt 36 is provided between the tongue 16 and the anchor plate 32 in the webbing 14, and the lap belt 36 is attached to the waist of the occupant 34. On the other hand, a shoulder belt 38 is provided between the through anchor 28 and the tongue 16 of the webbing 14, and the shoulder belt 38 is attached to the left side of the waist from the shoulder on the right side of the occupant 34 through the chest.

(Description of assist device 20)
The assist device 20 is provided on the lower left side of the seat 24. The assist device 20 includes a box-shaped case 42 that is long in the front-rear direction. As shown in FIG. 4, a guide screw 44 that is long in the front-rear direction is provided inside the case 42, and a bar-shaped guide rod 46 that is long in the front-rear direction is provided above the guide screw 44. . Both the front and rear ends of the guide screw 44 and the guide rod 46 are rotatably supported by a case 42 or a support member provided inside the case 42, and the guide screw 44 is connected to the assist motor via a reduction gear train. It is connected to an output shaft (both not shown).

  A block-shaped slide piece 48 is provided inside the case 42. A female screw hole 50 is formed through the slide piece 48 in the front-rear direction, and the female guide hole 44 is threaded through the female screw hole 50. A guide hole 52 is formed on the upper side of the female screw hole 50 of the slide piece 48 in the front-rear direction, and a guide rod 46 passes through the guide hole 52. When the guide screw 44 rotates, the slide piece 48 is guided by the guide rod 46 and slid in the front-rear direction.

  A cylindrical boot 54 penetrating in the vertical direction is fixed to the upper side of the slide piece 48. The boot 54 passes through a rectangular hole 56 formed in the upper wall of the case 42 in the front-rear direction, and the buckle 18 is removably inserted into the upper end of the boot 54. Therefore, the buckle 18 is slid in the front-rear direction together with the slide piece 48 between the mounting position on the rear end side of the rectangular hole 56 of the case 42 and the assist position on the front end side. Further, a connecting belt 58 is provided inside the boot 54. The connecting belt 58 has a lower end locked to the slide piece 48 and an upper end locked to the buckle 18. The connecting belt 58 is sewn in a state where the middle portion in the vertical direction is folded. When the connecting belt 58 is pulled upward with a load of a predetermined size or more, the suture is broken and the stitching is eliminated. , Extend upwards. As a result, the buckle 18 can move upward with respect to the boot 54.

(Description of roller device 22)
As shown in FIGS. 1 and 2, the roller device 22 is provided on the left side of the sheet 24. The roller device 22 includes a roller 62. As shown in FIG. 5B, the roller 62 is positioned above the tongue 16 inserted into the buckle 18 in a state where the buckle 18 is in the mounting position on the rear end side of the guide hole 52 of the assist device 20. It is provided as follows. As shown in FIG. 5, the roller 62 is formed in a rod shape whose central axis is directed in the front-rear direction, and a long slit 64 is formed in the front-rear direction. As shown in FIG. 4, the slit 64 penetrates in the radial direction of the roller 62 and opens at the front end of the roller 62 as shown in FIG. 5. The opening width of the slit 64 is larger than the thickness dimension of the webbing 14. For this reason, the webbing 14 can be inserted from the front end of the roller 62 into the slit 64. In addition, the roller 62 is set in advance so that the through-direction of the slit 64 is the vertical direction in the initial state.

A box-shaped case 66 is provided on the rear side of the roller 62, and the rear end side of the roller 62 is inserted into the case 66 and is rotatably supported. As shown in FIG. 3, a roller motor 72 as a roller driving means and a reduction gear train 74 as a reduction mechanism are provided inside the case 66.
The driving force of the roller motor 72 is transmitted to the roller 62 by the reduction gear train 74, and the roller 62 can be rotated around the central axis in the winding direction (the direction of arrow A in FIG. 4A).

  As shown in FIGS. 4A and 5B, when the roller 62 is rotated in the winding direction with the webbing 14 inserted through the slit 64 of the roller 62, the webbing 14 is moved to the roller 62. It is wound up. The reduction gear train 74 between the roller motor 72 and the roller 62 includes a worm gear and a worm wheel as a rotation limiting mechanism. Therefore, rotation transmission from the roller motor 72 to the roller 62 is possible, but even when the webbing 14 wound around the roller 62 is pulled, the rotation of the roller 62 is limited. The roller motor 72 is electrically connected to the control device 76, and the roller motor 72 is driven and controlled by the control device 76.

  In the present embodiment, the roller motor 72 is used as the roller driving means for rotating the roller 62. However, the roller driving means may use another configuration such as a gas generator that generates gas by burning the gas generating agent.

  In this embodiment, the rotation limiting mechanism is configured by the worm gear and the worm wheel. However, if the rotation of the roller 62 in the direction opposite to the winding direction can be limited, for example, a ratchet wheel and a latch are provided. The rotation limiting mechanism may be configured by using another mechanism such as a ratchet mechanism including the rotation mechanism.

  A guide piece 68 is fixed to the left side wall of the case 66 of the roller device 22. The guide piece 68 extends from the case 66 to the front side, bends to the right at the intermediate portion in the extending direction, and extends to the front side of the front end of the roller 62. Further, the guide piece 68 extends from the front side of the front end of the roller 62 so as to curve to the left front side. The leading end of the guide piece 68 is located above the tongue 16 attached to the buckle 18 and between the shoulder belt 38 and the lap belt 36. For this reason, when the buckle 18 is moved rearward by the assist device 20 in a state where the tongue 16 is inserted into the buckle 18, the lap belt 36 comes into contact with the right side surface on the distal end side of the guide piece 68. When the buckle 18 further moves rearward in this state, the lap belt 36 is guided to the front end of the roller 62 by the guide piece 68 and is inserted through the slit 64.

<Operation and effect of first implementation>
In the seat belt device 10 according to the present embodiment, the buckle 18 is in a standby position in front of the front end of the guide piece 68 in the initial state shown in FIG. When the door is opened and closed so that the occupant 34 gets into the vehicle, the assist motor of the assist device 20 is driven to rotate forward. Accordingly, when the guide screw 44 in the case 42 of the assist device 20 is rotated forward, the slide piece 48 is guided by the guide rod 46 and slid forward. As a result, the buckle 18 is moved from the standby position to the assist position on the front end side of the guide hole 52 of the case 42. In a state where the occupant 34 gets into the vehicle and sits on the seat 24, the buckle 18 has moved forward to the assist position, and thus the occupant 34 can easily insert the tongue 16 into the buckle 18.

  When the webbing 14 is hung on the body of an occupant 34 seated on the seat 24 and the tongue 16 is inserted and held in the buckle 18, the assist motor of the assist device 20 is driven by the buckle switch provided on the buckle 18. Driven in reverse. Thus, when the guide screw 44 is reversed, the buckle 18 is moved rearward. When the buckle 18 is moved further rearward than the standby position shown in FIG. 5A, the leading end side of the guide piece 68 enters between the lap belt 36 and the shoulder belt 38 above the tongue 16. Include. In this state, when the buckle 18 is further moved to the rear side, the lap belt 36 is guided to the guide piece 68 and moved to the right side while moving to the rear side.

  As a result, the lap belt 36 is guided to the front side of the opening of the slit 64 at the front end of the roller 62 and further enters the inside of the slit 64. As a result, when the buckle 18 moves rearward to the mounting position of the webbing 14, the lap belt 36 is inserted through the slit 64 in the radial direction of the roller 62 as shown in FIG. In this state, the lap belt 36 of the webbing 14 is attached to the waist of the occupant 34, and the shoulder belt 38 of the webbing 14 is attached to the left side of the lumbar region from the right shoulder of the occupant 34 through the chest.

  In this state, when the passenger 34 performs an operation for removing the tongue 16 from the buckle 18, the assist motor of the assist device 20 is driven to rotate forward. As a result, the buckle 18 is moved forward to the standby position. As a result, the lap belt 36 is extracted from the slit 64 and moved to the front side of the front end of the guide piece 68.

  On the other hand, when the vehicle collides with an obstacle or the like ahead in a state where the lap belt 36 is inserted into the slit 64 of the roller 62 or when an emergency state in which such a collision is predicted, the webbing take-up device 12 The lock mechanism is activated, and the withdrawal of the webbing 14 from the spool 26 is restricted. As a result, the body of the occupant 34 is restrained by the webbing 14, and movement of the occupant 34 toward the front side of the vehicle is restricted.

  In the emergency state, the roller motor 72 of the roller device 22 is driven by the control device 76. As a result, when the roller 62 is rotated in the winding direction (the direction of arrow A in FIG. 4A), the lap belt 36 is doubled around the outer periphery of the roller 62 as shown in FIG. 4B. It is wound up. When the roller 62 rotates and winds up the lap belt 36, the shoulder belt 38 passes through the tongue 16 and is moved to the lap belt 36 side. As a result, the tension of the lap belt 36 and the shoulder belt 38 is increased to be in a high tension state, and the lap belt 36 and the shoulder belt 38 are pulled with a tension higher than that of the webbing take-up device 12. As a result, the waist of the occupant 34 can be strongly restrained by the lap belt 36, and the right shoulder and chest of the occupant 34 can be strongly restrained by the shoulder belt 38.

  Here, in the present embodiment, if the roller 62 rotates around the central axis in the winding direction, the tension of the lap belt 36 and the shoulder belt 38 can be increased. For this reason, the tension of the lap belt 36 and the shoulder belt 38 can be increased without moving the roller 62.

  The reduction gear train 74 between the roller 62 and the roller motor 72 has a rotation limiting mechanism that includes a worm gear and a worm wheel. For this reason, even if the lap belt 36 is pulled, the rotation of the roller 62 is limited. As a result, the lap belt 36 is restricted from being pulled out from the roller 62. For this reason, it is possible to prevent or suppress the lap belt 36 from moving from the roller 62 to the anchor plate 32 side. Thus, the body of the passenger 34 can be strongly restrained by the lap belt 36.

  In addition, the tongue 16 may not be provided with a configuration for preventing or suppressing the lap belt 36 from moving from the roller 62 toward the anchor plate 32 side. For this reason, the number of parts of the tongue 16 can be reduced, and the cost of the tongue 16 can be reduced.

  When the tensile force applied to the shoulder belt 38 exceeds the mechanical strength of the load absorbing member of the force limiter mechanism provided in the webbing take-up device 12, the webbing 14 is moved from the spool 26 while the load absorbing member is deformed. Withdrawn. As a result, the upper body of the occupant 34 can move to the front side inertially, and the body of the occupant 34, in particular, the right shoulder and chest can absorb a part of the load received from the shoulder belt 38.

  Further, when the shoulder belt 38 is pulled with a force of a predetermined magnitude or more by the body of the occupant 34 trying to move inertially toward the front side of the vehicle with the lap belt 36 wound around the roller 62, the tongue 16 and the buckle 18, the connecting belt 58 in the boot 54 is pulled upward. As a result, the suture thread that sews the connecting belt 58 in the folded state is broken. As a result, as shown in FIG. 4C, the connecting belt 58 can extend upward, and the buckle 18 and the tongue 16 are pulled up by the shoulder belt 38 and raised. As a result, the restraint of the shoulder belt 38 with respect to the body of the occupant 34 is loosened, and the upper body of the occupant 34 can move to the front side by the amount by which the shoulder belt 38 is loosened. In particular, a part of the load received from the shoulder belt 38 on the lower side of the chest and the left side of the waist of the occupant 34 can be effectively absorbed by the breaking of the suture thread of the connecting belt 58.

  On the other hand, when the roller 62 winds the lap belt 36 as described above, the lap belt 36 is restricted from being pulled out from the roller 62. For this reason, as described above, even when the restraint on the body of the occupant 34 is loosened in the shoulder belt 38, the waist of the occupant 34 can be strongly restrained by the lap belt 36.

  Incidentally, for example, there is a configuration in which the webbing 14 is divided into a shoulder belt 38 and a lap belt 36 in advance, and each of the shoulder belt 38 and the lap belt 36 is locked to the tongue 16. In such a configuration, even if the shoulder belt 38 is loosened by the operation of the force limiter mechanism of the webbing take-up device 12, the lap belt 36 is not loosened. However, in such a configuration, the webbing take-up device 12 for taking up the lap belt 36 must be provided separately from the webbing take-up device 12 for taking up the shoulder belt 38. On the other hand, in the present embodiment, one webbing take-up device 12 may be provided, and the webbing 14 may not be divided. For this reason, a general three-point seat belt device can also be used.

  In this embodiment, the assist device 20 is a guidance device. However, the guidance device only needs to guide the lap belt 36 to the slit 64 of the roller 62 by moving the buckle 18 to the rear side. Therefore, the guiding device only needs to be able to move between the standby position and the webbing 14 mounting position without moving the buckle 18 to the assist position.

  Further, in the present embodiment, the lap belt 36 is guided to the slit 64 of the roller 62 by the guiding device moving the buckle 18 to the mounting position of the webbing 14. However, the timing at which the lap belt 36 is guided to the slit 64 of the roller 62 is not limited to such a configuration. For example, the guiding device is configured to be able to move the buckle 18 further to the rear side than the mounting position. In the emergency state, the guiding device moves the buckle 18 to the rear side from the mounting position, and the lap belt 36 is moved to the roller 62. Various timings may be applied to the timing of guiding the lap belt 36 to the slit 64 of the roller 62, such as guiding to the slit 64.

  Further, in the present embodiment, when the shoulder belt 38 is pulled with a force of a predetermined magnitude or more, the suture thread of the connecting belt 58 is broken, whereby the buckle 18 and the tongue 16 are pulled to the shoulder belt 38. It was the composition which can rise. However, even when the shoulder belt 38 is pulled with a force of a predetermined magnitude or more, the buckle 18 may not be raised.

<Second Embodiment>
Next, a second embodiment will be described.

  FIG. 6 is a perspective view showing a roller device 92 as a tension applying device of the seat belt device 90 according to the present embodiment. In the case 66 of the roller device 92, as in the first embodiment, in addition to the roller motor 72 and the reduction gear train 74 as the reduction mechanism and the rotation limiting mechanism, the roller device 92 is interlocked with the rotation of the roller 62. Thus, an elevating mechanism 94 that moves the roller 62 up and down is provided.

  In the seat belt device 90, when the roller 62 is rotated in the winding direction by the driving force of the roller motor 72 in the case 66, the roller 62 is lowered by the lifting mechanism 94. Therefore, in the present seat belt device 90, when the roller 62 rotates in the winding direction, the tension of the lap belt 36 is increased, but an excessive increase in the tension of the shoulder belt 38 is suppressed.

  For this reason, in the present seat belt device 90, the tension of the lap belt 36 can be increased more significantly than the shoulder belt 38. In addition, the moving range of the roller 62 for increasing the tension of the lap belt 36 can be reduced.

10 seat belt device 14 webbing 16 tongue 18 buckle 20 assist device (guidance device)
22 Roller device (tensioning device)
24 seat 34 occupant 36 lap belt 38 shoulder belt 62 roller 64 slit 90 seat belt device 92 roller device (tension applying device)

Claims (5)

A buckle provided on one side of the vehicle seat in the left-right direction;
A tongue held by the buckle;
A webbing provided on the body of an occupant seated on the seat by providing the tongue and holding the tongue on the buckle;
A tension applying device having a roller provided on one side of the sheet in the left-right direction, and rotating the roller so that the roller winds the webbing and applies tension to the webbing;
A seat belt device comprising: The seat belt device according to claim 1, wherein the tension applying device restricts rotation of the roller due to tension of the webbing. The roller is formed with a slit that opens at one end in the axial direction of the roller and penetrates in the direction perpendicular to the axis of the roller.
The seatbelt apparatus of Claim 1 or 2 provided with the guide device which guides the said webbing to the said slit, and inserts it in the said slit.   4. The seat belt device according to claim 3, wherein when the tongue is held by the buckle, the guide device moves the buckle to the rear side of the sheet to insert the webbing into the slit of the roller. The webbing is one shoulder belt than the tongue, and the other wrap belt than the tongue.
5. The device according to claim 1, wherein the buckle is moved by being pulled by the shoulder belt with a tensile load of a predetermined size or more in a state where the roller winds and holds the lap belt. A seat belt device according to claim 1.