JP2011051527A - Seat belt device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat belt device having further improved safety by constraining an occupant adequately depending on conditions. <P>SOLUTION: The seat belt device 100 typically includes a first joint part 130 arranged near a seat cushion 202, a second joint part 140 held movably on a webbing 102 inserted therethrough and joined to the first joint part 130, a first winding part 110 for winding the webbing 102 through its shoulder side, a second winding part 120 for winding the webbing 102 through its waist side, a vehicle control device 150 for controlling the winding force of each of the first winding part 110 and the second winding part 120, and stoppers 142, 242 adapted to be fixed to the webbing 102 at the shoulder side of the second joint part 140 for interfering with the second joint part 140 to restrict the movement thereof. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a three-point seat belt device including a webbing that is slanted from a shoulder portion of an occupant to a waist portion on one side and is further stretched on a waist portion on the other side.

  As one of safety devices provided in a vehicle, a seat belt device is widely used. The seat belt device is intended to prevent the occupant from colliding with surrounding objects (instrument panel, steering wheel, windshield, etc.) due to the impact when an accident occurs. Protect. In particular, in recent years, in order to ensure the safety of the occupant, the seat belt device must be worn even in the rear seat, and a three-point seat belt device that restrains the shoulder, chest, and waist of the occupant has become mainstream. The three-point seat belt is mounted by connecting a tongue attached to the webbing to a buckle disposed in the vicinity of the seat cushion.

  One problem with the three-point seat belt device is that the webbing that restrains the occupant's lower back in the event of an accident is lifted to the abdomen. If this shift occurs, the occupant's waist to be restrained cannot be restrained and the performance of the seat belt device cannot be exhibited effectively, and the abdomen near the occupant's internal organs may be damaged.

  Therefore, Patent Document 1 discloses a technique for preventing the webbing that restrains the waist from being lifted to the abdomen. Usually, the shoulder belt that restrains the upper body of the occupant and the lap belt that fixes the waist are one webbing that passes through the tongue, and is divided into both by the tongue attached to the buckle. On the other hand, in patent document 1, the end part of the shoulder belt which restrains a passenger | crew's shoulder part and the edge part of the lap belt which restrains a waist | lumbar part are separately fixed to a tongue. Then, by increasing the ratio of the shoulder belt to the lap belt at the time of an accident, the movement amount of the occupant's waist is reduced (binding force is increased), and the movement amount of the upper body of the occupant is increased (binding force is reduced). This reduces the amount of hip rotation and prevents the lap belt from rising to the abdomen.

Japanese Patent Laid-Open No. 11-20613

  However, in the technique of Patent Document 1, it has been proved by a thread test (actual vehicle forward collision simulation test) that the lap belt cannot be prevented from being lifted to the abdomen. This is because the tongue that is coupled to the buckle follows the movement of the buckle that moves in the direction to stand up in the event of an accident, and the lap belt that is fixed to the tongue also follows this movement. In the case of a conventional seat belt device, the tongue can move on the webbing (belt). Therefore, even if the tongue moves, the lap belt does not follow the tongue, and the problem of sliding up does not become apparent. However, in the case of Patent Document 1, although the restraining force of the lap belt can be increased independently, the above-mentioned follow-up occurs and the problem of sliding up occurs. If the buckle is fixed so as not to move, such a problem can be solved. However, in that case, the attachment / detachment workability and the feeling of attachment are impaired.

  Furthermore, as described above, the technique of Patent Document 1 relatively increases the amount of movement of the upper body (decreases the restraining force). However, in view of safety, this behavior is always performed when an impact occurs. It is not preferable. If the movement amount of the upper body is increased uniformly without considering the traveling speed immediately before the vehicle, the type of accident (normal collision, side collision, spin, rollover, etc.), vehicle characteristics, etc. May collide with surrounding items.

  In Patent Document 1, it is considered that a forward collision is assumed. However, for example, there is no mention of how to avoid an occupant from colliding with a vehicle side wall in the case of a side collision. In addition, there is a difference in physique between individual occupants, and the amount of movement of the upper body that is allowed differs between small occupants and large occupants.

  However, it is not practical to formulate the amount of movement of the upper body according to the occupant's physique because it involves a great deal of labor. Depending on the situation, it is necessary to regulate the movement of the upper body even if the occupant's waist is allowed to move to some extent.

  In addition, in the case of a minor accident where the occupant is unlikely to be damaged, there is a request to minimize unnecessary devices. This is because the pretensioner device that winds up the webbing when an impact occurs usually operates by exploding explosives, and once activated, it must be replaced for each unit.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a seatbelt device that further enhances safety by restraining an occupant appropriately according to the situation.

  In order to solve the above-described problems, a representative configuration of the present invention is a three-point seat belt provided with a webbing that is slanted from the shoulder portion of the occupant to the waist portion on one side and is further stretched on the waist portion on the other side. In the apparatus, a first coupling portion disposed in the vicinity of the seat cushion, a second coupling portion that is inserted through the webbing and is held movably on the webbing, and coupled to the first coupling portion, and a shoulder side of the webbing A first winding part for winding the webbing from the waist, a second winding part for winding the webbing from the waist side of the webbing, and a vehicle control for controlling the winding force of the first winding part and the second winding part The apparatus and the webbing can be fixed to the shoulder portion side of the second coupling portion, and include a stopper that interferes with the second coupling portion and restricts its movement.

  According to this configuration, when the winding force of the second winding unit is larger than that of the first winding unit, the stopper interferes with the second coupling unit, and the shoulder of the first winding unit is located on the shoulder side with the stopper as a boundary. A winding force acts, and the winding force of the second winding portion acts on the waist side. That is, it is possible to apply separate restraining forces to the shoulder and waist of the webbing, and relatively increase the restraining force of the waist. Such an operation is suitable for vehicles that are less likely to collide with surrounding objects from the head, such as normal collisions during high-speed traveling, side collisions that may cause the passengers to be thrown out of the vehicle, spins, rollovers, etc. is there. This is because the upper body of the occupant does not collide with surrounding objects even when the restraining force of the shoulder is reduced, and the occupant is strongly restrained and the occupant does not leave the seat.

  In Patent Document 1, even if the restraining force of the waist is relatively increased, the shoulder belt and the end of the lap belt are separately fixed to the tongue, and the buckle engaged with the tongue can move. Couldn't keep up the abdomen. However, in the configuration of the present invention, since the second coupling portion is held so as to be movable on the webbing, even if the first coupling portion (for example, buckle) moves, the second coupling portion (for example, tongue) remains on the webbing. It only moves, and does not involve the movement of the webbing (lap belt) that restrains the waist. Therefore, it is also possible to more effectively suppress the webbing from rising to the abdomen.

  On the other hand, when it is necessary to regulate the movement of the upper body, the winding force of the first winding unit and that of the second winding unit are the same, or the winding of the first winding unit from the second winding unit is the same. You just need to increase the power. In this case, division of the restraining force with the stopper as a boundary does not occur, and the restraining force of the webbing that restrains the shoulder portion does not become relatively small, so that the upper body is not allowed to move. Therefore, compared with the case where the winding force of the second winding unit is larger than that of the first winding unit, it is difficult to suppress the webbing from rising to the abdomen, but there is a risk that the head may come into contact with objects around the vehicle. Can be reduced. This aspect is suitable when a side collision, spin, rollover, or the like occurs in a vehicle in which a sufficient gap dimension is not ensured between the occupant and the vehicle side wall.

  In the case of a minor accident, it is possible to operate either the first winding unit or the second winding unit. By limiting the units to be operated, labor and cost for replacement work can be reduced.

  In the event of an accident, the vehicle control device may operate either one or both of the first winding unit and the second winding unit based on the immediately preceding traveling speed or the form of the accident. Thereby, it becomes possible for the vehicle control device to accurately grasp the situation at the time of the accident, and the first winding unit or the second winding unit can be suitably operated.

  The seat belt device may further include a long connecting member that connects the first coupling portion and the stopper. As a result, when the winding force of the second winding unit is larger than that of the first winding unit, the stopper is held without being too far from the second coupling unit, so the stopper and the second coupling unit can be quickly moved. Can interfere. That is, the amount of winding of the second winding unit can be reduced.

  When the vehicle control device operates only the first winding unit, the connecting member may be broken or extended. Thereby, the slack of webbing can be removed effectively.

  The first coupling portion and the second coupling portion are a tongue and a buckle, respectively. The tongue has a webbing inserted through a guide hole formed in a substantially oval shape, and the stopper cannot pass through the guide hole. It is good to be. Thereby, the effect of the said seatbelt apparatus can be exhibited effectively.

  The first winding unit and the second winding unit may be a retractor including a pretensioner device. Thereby, the said seatbelt apparatus can be constructed | assembled suitably.

  ADVANTAGE OF THE INVENTION According to this invention, the seatbelt apparatus which improved safety | security further can be provided by restraining a passenger | crew appropriately according to a condition.

It is a figure which illustrates embodiment of the seatbelt apparatus of this invention. FIG. 2 is a usage diagram of the seat belt device of FIG. 1. It is a figure explaining the stopper of FIG. It is a figure explaining the other stopper which can replace the stopper of FIG. It is a figure illustrated about the structure of the vehicle control apparatus of FIG. It is a figure which illustrates the state before mounting | wearing of the seatbelt apparatus of FIG. It is a figure which illustrates schematically the example of control of the shoulder retractor and the waist retractor at the time of the accident of the vehicle control apparatus of FIG. It is a figure explaining the 1st control example of FIG. It is a figure explaining the behavior of the webbing which restrains the waist | hip | lumbar part in the seatbelt apparatus of FIG. It is a figure explaining the behavior of the webbing which restrains the waist | lumbar part in the conventional seatbelt apparatus as a comparative example which can divide a winding force. It is a figure explaining the 2nd control example of FIG. It is a figure explaining the 3rd control example of FIG. It is a figure explaining the 3rd control example of FIG.

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

(Seat belt device 100)
FIG. 1 is a diagram illustrating an embodiment of a seat belt device of the present invention. FIG. 2 is a diagram showing how the seat belt device illustrated in FIG. 1 is used. The seat belt device 100 includes a webbing 102, a shoulder retractor 110 as a first winding unit, a waist retractor 120 as a second winding unit, a shoulder support 126, a buckle 130 as a first coupling unit, a connecting belt 132, The tongue 140, the stopper 142, the connecting member 144, and the vehicle control device 150 as the second coupling portion are included.

  The seat belt device 100 is disposed in a seat cushion device 200 including a seat cushion 202, a seat back 206, and a headrest 210. The seat cushion 202 is slidable in the vehicle front-rear direction in order to seat the occupant at a suitable position. The seat cushion 202 is connected to a seat back 206 by a rotating shaft 204 provided at the rear, and the seat back 206 can be rotated by a predetermined angle about the rotating shaft 204. The headrest 210 has a stay inserted in a seat frame (not shown) embedded in the upper portion of the seat back 206. By adjusting the amount of stay inserted into the seat back 206, the height of the headrest 210 can be adjusted.

  The webbing 102 is a belt-like belt formed of polyester fiber or the like, and is slanted from the occupant's shoulder to the waist on one side, and further on the waist on the other side. In the present embodiment, the webbing 102 has a shoulder side end connected to the shoulder retractor 110 and a waist side end connected to the waist retractor 120.

  The shoulder retractor 110 is installed inside the pillar 60 of the vehicle and winds the webbing 102 on the connected shoulder side. The waist retractor 120 is attached to the vehicle side surface of the seat cushion 202 and winds up the connected webbing 102 on the waist portion side. The shoulder retractor 110 and the waist retractor 120 are provided with a pretensioner device, and have a load limiter mechanism and a direct ramp mechanism.

  The shoulder support 126 has a webbing 102 inserted through a guide hole 126a formed in a substantially oval shape, and is fixed to the top of the pillar 60 so as to be rotatable at a predetermined angle with a bolt or the like. The webbing 102 pulled out from the shoulder retractor 110 is turned toward the passenger by the shoulder support 126.

  The connection belt 132 is a belt-like belt, and one end is connected to the vehicle or the seat cushion 202 and the other end is connected to the buckle 130. The connecting belt 132 may be made of the same material as the webbing 102 described above.

  The buckle 130 is held near the seat cushion 202 so as to be movable within a predetermined range by the length of the connecting belt 132. Instead of the connecting belt 132, a so-called buckle plate fixed to the vehicle or the seat cushion 202 by a bolt so as to be rotatable at a predetermined angle may be used.

  The tongue 140 has a webbing 102 inserted through a substantially oval guide hole 140a, and is held movably on the webbing 102. The occupant attaches or detaches the seat belt device 100 by coupling or detaching the tongue 140 with the buckle 130. The arrangement of the buckle 130 and the tongue 140 may be reversed.

  FIG. 3 is a diagram illustrating the stopper of FIG. 3A is a view for explaining the stopper 142, and FIG. 3B is a case where the waist retractor 120 (the winding force is larger than the shoulder retractor 110) is operated from the state of FIG. 3A. FIG. As illustrated in FIG. 3A, the stopper 142 is fixed at an arbitrary position on the webbing 102 closer to the shoulder retractor 110 than the tongue 140. Although not shown, the tongue 140 is attached to the buckle 130.

  The stopper 142 is provided with two substantially oblong insertion holes 142a having approximately the same width as the webbing 102 in parallel, and the webbing 102 communicates with the insertion hole 142a. A portion of the webbing 102 located between the two insertion holes 142a is referred to as an insertion portion 102a, and the stopper 142 is fixed on the webbing 102 by the insertion portion 102a being stretched. In order to fix the stopper 142 to another position on the webbing 102, the insertion part 102a of the webbing 102 may be pulled out and moved to a desired position, and then the insertion part 102a may be stretched again.

  The stopper 142 is more firmly fixed on the webbing 102 as the webbing 102 is communicated so as to meander with more insertion holes 142a and the interval between the insertion holes 142a to be communicated is narrower. Therefore, the number and interval of the insertion holes 142a may be determined in consideration of the winding force of the shoulder retractor 110 and the waist retractor 120.

  When the lumbar retractor 120 is operated from the state of FIG. 3A, the webbing 102 and the stopper 142 fixed on the webbing 102 are drawn as illustrated in FIG. 3B. At this time, the tongue 140 is attached to the buckle 130 (not shown) and the webbing 102 is freely slid, so that it does not follow the webbing 102. As a result, the stopper 142 and the tongue 140 come into contact with each other while the connecting member 144 is loosened, and the stopper 142 stops. This is because the stopper 142 cannot pass through the guide hole 120a of the tongue 140 or the guide hole 126a of the shoulder support 126, and the tongue 140 restricts the movement of the stopper 142.

  Thus, the winding force of the waist retractor 120 acts only on the webbing 102 on the waist retractor 120 side from the stopper 142, and the winding force of the shoulder retractor 110 is the webbing 102 on the shoulder retractor 110 side from the stopper 142. The division of the winding force is achieved, which only acts on.

  FIG. 4 is a diagram illustrating another stopper 240 that can be replaced with the stopper 142 of FIG. 4A is a diagram for explaining the stopper 240, and FIG. 4B is a case where the waist retractor 120 (the winding force is larger than that of the shoulder retractor 110) is operated from the state of FIG. 4A. FIG. As illustrated in FIG. 4A, the stopper 240 is a so-called crocodile clip that includes a first engagement member 244, a second engagement member 246, a shaft 248, and a torsion coil spring 250. The shaft 248 is engaged with the first meshing member 244 and the second meshing member 246, and the elastic force of the torsion coil spring 250 acts so that the first meshing member 244 and the second meshing member 246 are brought into contact with each other at the tip. ing.

  The webbing 102 is inserted through the insertion hole 244 a of the first engagement member 244 and is sandwiched between the first engagement member 244 and the distal end of the second engagement member 246. Accordingly, the stopper 240 is fixed on the webbing 102. In order to more firmly hold the webbing 102, the tips (holding surfaces) of the first engagement member 244 and the second engagement member 246 may be formed in a tooth shape that fits each other. Moreover, you may provide a slip-off prevention structure at this front-end | tip.

  In order to move the stopper 240 to an arbitrary position on the webbing 102, the first engagement member 244 and the second engagement member 246 may be pressed from the rear end side against the elastic force of the torsion coil spring 250. Thereby, the front ends of the first meshing member 244 and the second meshing member 246 are opened, and the webbing 102 can be moved to an arbitrary position. After moving to an arbitrary position, the pressing may be released and the webbing 102 may be held between the first meshing member 244 and the second meshing member 246 by the elastic force of the torsion coil spring 250.

  As illustrated in FIG. 4B, when the lumbar retractor 120 is operated from the state of FIG. 4A, the webbing 102 and the stopper 240 fixed on the webbing 102 are pulled in the same manner as described above. Eventually, the stopper 142 and the tongue 140 come into contact with each other, and the winding force is divided.

  Please refer to FIG. 1 and FIG. 2 again. The connecting member 144 has an elongated shape and is connected to the tongue 140 and the stopper 142 by a clip 144a. When the tongue 140 is held so as not to be too far from the stopper 142 and the waist retractor 120 (the winding force is larger than that of the shoulder retractor 110) is operated, the tongue 140 and the stopper 142 are quickly caused to interfere with each other for winding. This is to achieve a division of power.

  FIG. 5 is a diagram illustrating the configuration of the vehicle control device in FIG. 1. As illustrated in FIG. 5, the vehicle control device 150 includes at least one ECU (Electronic Control Unit) 152, a memory 154, a speed sensor 156, and an acceleration sensor 158, and includes a shoulder retractor 110 and a waist sensor. The winding force of the retractor 120 is controlled. In the event of an accident, the vehicle control device 150 determines the travel speed immediately before from the speed sensor 156 and the form of the accident from the acceleration sensor 158 provided at a specific position of the vehicle, and the shoulder retractor 110 or the waist retractor 120. The pretensioner device provided in is operated. Therefore, it is possible to accurately capture the situation at the time of the accident and restrain the occupant appropriately. Note that the vehicle control device 150 does not necessarily have to operate the shoulder retractor 110 and the waist retractor 120 based only on information at the time of the accident (travel speed, accident type). The shoulder retractor 110 and the waist retractor 120 may be controlled in consideration of vehicle characteristics (vehicle width dimensions, occupant information, etc.) input in advance to the memory 154.

  Hereinafter, in order to facilitate understanding, the retractor 110 for the shoulder, the retractor 120 for the lumbar, and the pretensioner device provided to each are operated to change the winding force of each retractor at the time of the accident. . However, the present embodiment is not limited to this. In other words, any method can be included in the present embodiment as long as the shoulder retractor 110 and the waist retractor 120 can change the winding force in response to a command issued from the ECU 152.

(Installation procedure of seat belt device 100)
FIG. 6 is a diagram illustrating a state before the seat belt device 100 of FIG. 1 is mounted. FIG. 6A is a diagram illustrating a state before the seat belt device 100 is mounted when the winding force of the shoulder retractor 110 is larger than that of the waist retractor 120 in a normal time when no accident occurs. Since the shoulder retractor 110 is dominant, the stopper 142 is wound up to the shoulder support 126. As described above, the stopper 142 cannot pass through the guide hole 126a of the shoulder support 126. The tongue 140 is suspended from the stopper 142 by a connecting member 144. From this state, an occupant seated on the seat cushion device 200 (see FIG. 2) grips the tongue 140 with the left hand, pulls out the webbing 102 from both retractors, moves the tongue 140 from the right shoulder to the left waist, Join.

  In such a mounting operation, the webbing 102 is pulled out from both the retractors 110 and 120, and the buckle 130 is allowed to move to some extent. Therefore, a series of operations can be performed smoothly, and good detachment workability can be obtained. In particular, since the tongue 140 can move on the webbing 102, it is easy for a user who is familiar with the conventional configuration.

  FIG. 6B is a diagram illustrating a state before the seat belt device 100 is mounted when the retracting force of the lumbar retractor 120 is larger than that of the shoulder retractor 110 in a normal time when no accident occurs. Since the waist retractor 120 is dominant, the stopper 142 is wound up to the vicinity of the waist retractor 120. This is because the stopper 142 cannot pass through the guide hole 140a of the tongue 140 as described above. From this state, an occupant seated on the seat cushion device 200 (see FIG. 2) grasps the tongue 140 with the left hand, pulls out the webbing 102 from both retractors, moves the tongue 140 from the right waist to the left waist, Join. Even in such a case, it is possible to ensure good detachability. When the lumbar retractor 120 is dominant during normal times as shown in FIG. 6B, the stopper 142 is substantially in contact with the tongue 140, so the connecting member 144 is not essential.

(Behavior during an accident)
FIG. 7 is a diagram schematically illustrating a control example of the shoulder retractor 110 and the waist retractor 120 when the vehicle control device 150 of FIG. 1 is in an accident. However, the control example in FIG. 7 is merely an example of this embodiment. If the occupant can be restrained appropriately in consideration of the traveling speed immediately before the vehicle at the time of the accident, the type of accident (normal collision, side collision, spin, rollover, etc.), vehicle characteristics, etc., other specific controls You can decide how you want.

  As illustrated in FIG. 7, in the present embodiment, the vehicle control device 150 according to the traveling speed immediately before the vehicle at the time of the accident, the form of the accident (normal collision, side collision, spin, rollover, etc.), vehicle characteristics, and the like. 1) The retracting force of the waist retractor 120 is larger than that of the shoulder retractor 110, 2) the shoulder retractor 110 and the retractor 120 for the waist are operated with the same retracting force, and 3) the retractor 110 for the shoulder is operated. Any control of operating the pretensioner device is performed. First, 1) Making the winding force of the waist retractor 120 larger than the shoulder retractor 110 will be described in detail.

  FIG. 8 is a diagram illustrating the first control example of FIG. The state which restrained the passenger | crew by making the winding force of the retractor 120 for waists larger than the retractor 110 for shoulders at the time of an accident is illustrated. In this case, the stopper 142 interferes with the tongue 140, and the winding force of the shoulder retractor 110 acts on the shoulder side with the stopper 142 as a boundary, and the winding force of the waist retractor 120 acts on the waist side. . That is, the winding force applied to the shoulder and the waist can be divided by the stopper 142 to relatively increase the restraining force of the waist.

  Such control is realized by operating the pretensioner device provided in the lumbar retractor 120 and operating the pretensioner device of the shoulder retractor 110 with a weaker force at the same time in the event of an accident. Since the stopper 142 is held by the connecting member 144 without being separated from the tongue 140, the amount of winding of the waist retractor 120 until the winding force is divided is reduced, and the stopper 142 and the tongue 140 can be quickly moved. Can interfere. In other words, since the connecting member 144 is provided, the stopper 142 and the tongue 140 interfere with each other within a range within the winding amount of the pretensioner device.

  The above-described control is, for example, a frontal collision during high-speed traveling, a side collision, a spin, a roll in a vehicle in which there is a possibility that the occupant's head is not struck against surrounding objects even if there is a margin to the side wall and the upper body is allowed to move. This is effective when over. Experimentally, it has been found that such control is extremely dangerous and can protect the occupant almighty. This control is also achieved by delaying the operation of the pretensioner device of the shoulder retractor 110 from that of the lumbar retractor 120. If a difference is provided in the operation time, the winding force is adjusted, or a load limiter mechanism or a direct ramp mechanism is used in combination, the occupant can be restrained more suitably.

  A further feature of the present embodiment is that even when the retracting force of the waist retractor 120 is larger than the shoulder retractor 110, the webbing 102 that restrains the waist is prevented from being lifted to the abdomen. . The details will be described below.

  FIG. 9 is a diagram for explaining the behavior of the webbing 102 that restrains the waist in the seat belt device 100 of FIG. 1. FIG. 10 is a diagram for explaining the behavior of the webbing (lap belt 12b) that restrains the waist in a conventional seat belt device as a comparative example in which the winding force can be divided.

  In the seat belt device 100 according to the present embodiment in FIG. 9, the tongue 140 is held so as to be movable on the webbing 102. Therefore, even if the buckle 130 moves upward as illustrated in FIG. 9A, the tongue 140 only moves on the webbing 102 as illustrated in FIG. 9B. The webbing that restrains the abdomen (shown as webbing 102b in FIG. 9) hardly moves as exemplified by the distance D1, and the sliding is prevented.

  On the other hand, in the conventional seat belt device in which the respective end portions of the shoulder belt 12a as webbing for restraining the shoulder portion of the occupant and the lap belt 12b as webbing for restraining the waist portion of the occupant are separately fixed to the tongue 40. , It is not possible to suppress the lap belt 12b from rising to the abdomen. As illustrated in FIG. 10A, when the buckle 130 moves upward, the lap belt 12b fixed to the tongue 40 as illustrated in FIG. 10B moves up to the abdomen over the distance D2. End up.

  Therefore, in the seatbelt apparatus 100, even if it is a case where a passenger | crew is restrained by the control mentioned above, it becomes possible to improve safety | security rather than before.

  FIG. 11 is a diagram illustrating the second control example of FIG. The state which restrained the passenger | crew by operating the retractor 110 for shoulders and the retractor 120 for waists by the equivalent winding force at the time of an accident is illustrated.

  As illustrated in FIG. 11, when the winding force of the shoulder retractor 110 and the waist retractor 120 is made equal, the webbing 102 that restrains the shoulder portion and the waist portion of the occupant is generally applied with a uniform winding force. 142 hardly moves. Such control is effective when, for example, side collision, spin, rollover, or the like occurs when information that can be determined to be unacceptable to move the upper body is input in the memory 154 in advance.

  Experimentally, it has been found that 1) the retracting force of the lumbar retractor 120 is greater than that of the shoulder retractor 110, but in general can effectively restrain the occupant. However, this is not the case in all situations. For example, in a small car or the like in which a gap between the passenger and the side wall cannot be secured, there is a risk of hitting the surrounding articles. Therefore, in this embodiment, the vehicle control device 150 controls the winding force of the shoulder retractor 110 and the waist retractor 120 so as to minimize the risk based on the memory 154, the speed sensor 156, and the acceleration sensor 158. And restrain the crew.

  As illustrated in FIG. 11, when the pretensioner device provided in the shoulder retractor 110 and the waist retractor 120 is operated with an equal winding force in the event of an accident, the buckle 130 is moved upward by the winding force. Can move. However, as described above, since the tongue 140 can freely move on the webbing 102, the webbing 102 that restrains the waist is prevented from being lifted to the abdomen. Even in such a control, in the event of an accident, the occupant can be restrained more suitably by adjusting the winding force or using a load limiter mechanism or a direct ramp mechanism in combination.

  12 and 13 are diagrams for explaining the third control example of FIG. 7. The state which restrained the passenger | crew by operating only the pretensioner apparatus of the shoulder retractor 110 at the time of an accident is illustrated.

  As illustrated in FIGS. 12 and 13, when the pretensioner device of the shoulder retractor 110 is operated, the connecting member 144 is broken (FIG. 12) or extended (FIG. 13), and the stopper 142 is wound up to the shoulder support 126. . Thereby, even if only the pretensioner device provided in the shoulder retractor 110 is operated, the slack of the webbing 102 can be taken up instantly to restrain the occupant, and a mild accident can be dealt with. In such control, the safety of the occupant can be appropriately ensured without operating the pretensioner device provided in the waist retractor 120. In other words, after the accident, it is only necessary to replace the pretensioner device provided in the shoulder retractor 110, so that labor and cost for the replacement work can be reduced. Note that the connecting member 144 is not limited to breaking or stretching, and the clip 144a may be opened by, for example, an operation of a pretensioner device.

  As illustrated in FIG. 12 and FIG. 13, when the pretensioner device provided in the shoulder retractor 110 is operated in the event of an accident, the buckle 130 can move upward by the winding force. However, as described with reference to FIG. 11, the webbing 102 is prevented from being lifted to the abdomen.

  When both the pretensioner devices are operated at the time of an accident and the winding force of the shoulder retractor 110 is made larger than that of the lumbar retractor 120, the state illustrated in FIG. In this case, the winding force from the waist retractor 120 acts on the webbing 102 that restrains the occupant. That is, in general, the control is similar to a control example in which 2) the shoulder retractor 110 and the waist retractor 120 are operated with the same winding force.

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

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

  A pretensioner device may be connected to the end of the webbing 102 instead of the shoulder retractor 110 and the waist retractor 120. Further, the vehicle control device 150 may control the winding force of the shoulder retractor 110 and the waist retractor 120, and the behavior at the time of the accident may be changed as appropriate. The structure of the stopper 142 may be changed as appropriate. The connecting member 144 may hold the tongue 140 and the stopper 142 at a necessary interval and be broken or extended with a predetermined winding force, and the length and strength thereof may be set as appropriate.

  INDUSTRIAL APPLICABILITY The present invention can be used for a three-point seat belt device including a webbing that is slanted from a passenger's shoulder portion to a waist portion on one side and is further stretched to the waist portion on the other side.

DESCRIPTION OF SYMBOLS 100 ... Seat belt apparatus, 102 ... Webbing, 102a ... Insertion part, 110 ... Shoulder retractor (1st winding part), 120 ... Waist retractor (2nd winding part), 126 ... Shoulder support, 126a ... Guide hole , 130 ... Buckle (first coupling portion), 132 ... Connection belt, 140 ... Tongue (second coupling portion), 140a ... Guide hole, 142 ... Stopper, 142a ... Insertion hole, 144 ... Connection member, 150 ... Vehicle control device , 152 ... ECU, 154 ... memory, 156 ... speed sensor, 158 ... acceleration sensor, 200 ... seat cushion device, 202 ... seat cushion, 204 ... rotating shaft, 206 ... seat back, 210 ... headrest, 240 ... stopper, 244 ... 1st meshing member, 244a ... insertion hole, 246 ... 2nd meshing member, 248 ... shaft, 250 ... twist Yl spring

Claims (6)

In a three-point seat belt device comprising a webbing that is slanted from the shoulder portion of the occupant to the waist portion on one side and is further stretched on the waist portion on the other side,
A first coupling portion disposed in the vicinity of the seat cushion;
A second coupling portion inserted through the webbing and held movably on the webbing and coupled to the first coupling portion;
A first winding portion for winding the webbing from the shoulder side of the webbing;
A second winding portion for winding the webbing from the waist side of the webbing;
A vehicle control device for controlling a winding force of the first winding unit and the second winding unit;
Of the webbing, a stopper that can be fixed to the shoulder side of the second coupling portion, interferes with the second coupling portion, and restricts movement of the second coupling portion;
A seat belt device comprising:   The vehicle control device operates one or both of the first winding unit and the second winding unit based on the immediately preceding traveling speed or the form of the accident in the event of an accident. The seat belt device according to 1.   The seat belt device according to claim 1, further comprising a long connecting member that connects the first coupling portion and the stopper.   The seat belt device according to claim 3, wherein when the vehicle control device operates only the first winding unit, the connecting member is broken or extended. The first coupling portion and the second coupling portion are a tongue and a buckle, respectively.
5. The tongue according to claim 1, wherein the webbing is inserted into a guide hole formed in a substantially oval shape, and the stopper cannot pass through the guide hole. A seat belt device according to claim 1.   The seat belt device according to any one of claims 1 to 5, wherein the first winding unit and the second winding unit are retractors including a pretensioner device.

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