JP2008149949A - Seat belt device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat belt device capable of preventing forward movement of an occupant in collision with a simpler constitution. <P>SOLUTION: The seat belt device 1 is a seat belt device provided with a band-like member 3 for restraining the occupant M to a seat 2; and a tension giving means 4 for giving tension to the band-like member 3. The band-like member 3 is extended to the inside of a sitting part 2a of the seat 2 in a vehicle width direction, and out of the portion extended to the inside of the sitting part 2a of the seat 2 of the band-like member 3, a portion 3a positioned below a thigh part of the occupant M is positioned at lower portions 3b, 3c positioned at both sides of the portion 3a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a seat belt device suitable for application to automobiles such as passenger cars, trucks, and buses.

  In recent vehicles, in order to prevent the passenger from colliding with the instrument panel lower panel, steering column, windshield, etc. inside the vehicle or being thrown out of the vehicle due to the impact at the time of collision, restraining the passenger to the seat at the time of the collision Is equipped with a seat belt device. In addition, this seat belt device applies a tension larger than the retractor retracting force to the belt constituting the seat belt at the time of collision, that is, removes the slack of the webbing, A pretensioner is provided to make the restraint more reliable.

In such a seat belt device, as described in Patent Document 1, the occupant is prevented from moving forward at the time of collision, as described in Patent Document 1, so that the occupant is restrained to the seat at the time of collision. In order to prevent obstacles such as ligament damage caused by bruise of the occupant's lower limbs, fractures, or movement of the body forward with the ankle fixed due to the lower limbs colliding with an instrument panel or steering column In addition, there has been proposed a seat belt device configured to transmit the power of the above-described pretensioner to a seat portion of a seat by a link mechanism and lift an occupant's thigh upward.
JP-A-5-77686

  However, the seat belt device having such a configuration requires a separate link mechanism for transmitting the power of the pretensioner to the seat portion of the seat, increasing the number of parts, making the mechanism complicated, and increasing the weight and cost. There was a problem of inviting. Other means to prevent the occupant from moving forward in the event of a collision include a knee bolster constructed by installing a shock absorber inside the knee airbag and front panel, and a pipe embedded in the vehicle width direction, Cushion restraint device (CRD) that moves the pipe upward by the power of gunpowder or spring at the time of collision and lifts the occupant's thigh upward can be cited. Increasing complexity, weight and cost are inevitable.

  In view of the above problems, an object of the present invention is to provide a seat belt device that can prevent a passenger from moving forward in a collision with a simpler configuration.

In order to solve the above problems, a seat belt device according to the present invention is:
A seat belt device comprising: a belt-like member that restrains an occupant to a seat; and a tension applying unit that applies tension to the belt-like member,
While extending the belt-like member in the vehicle width direction inside the seat portion of the seat,
Of the portion of the belt-like member that extends into the seat portion of the seat, the portion located below the thigh of the occupant is positioned below the portion located on both sides of the portion. Features.

  Here, the belt-like member is specifically a webbing constituting a seat belt device, and the tension applying means is a webbing provided in the seat belt device to a webbing at the time of collision or when a collision is predicted. This is a pretensioner that applies a tension larger than the retracting force of the retractor, removes the slack of the webbing, and makes the occupant restrain the seat more securely.

Here, in the seat belt device,
In extending the belt-like member inside the sheet, the belt-like member comprises a plurality of regulating means for regulating the extending direction of the belt-like member,
Here, the restriction means is specifically a webbing guide.

  According to this, with a simpler configuration, the thigh of the occupant among the portions of the belt-shaped member that extends into the seat portion of the seat by extending the belt-shaped member into the seat. It is possible to realize that the part located below the part is located below the part located on both sides of the part.

  Thereby, when the tension applying means applies tension to the belt-like member at the time of a collision or the like, a portion of the belt-like member located below the thigh of the occupant is pulled in the vehicle width direction by the tension. Since it moves upward, the portion of the seat located above the portion and the thigh of the occupant can be lifted upward to prevent the occupant from moving forward in the event of a collision.

  As a result, in the event of a collision, etc., the occupant's lower limb collides with the instrument panel lower panel, steering column, etc., and the occupant's lower limb is bruised, fractured, or the body moves forward with the ankle fixed. It is possible to prevent a ligament injury or the like and to prevent an occupant's leg injury or the like.

  In addition, it is possible to avoid the addition of separate parts such as a link mechanism, a knee airbag, a knee bolster, and a CRD as in the prior art, and to eliminate the configuration that causes an increase in the number of parts, a complicated mechanism, and an increase in weight and cost. it can.

Furthermore, in the seat belt device,
A support means for supporting the thigh of the occupant is provided above the portion of the belt-like member located below the thigh of the occupant.
It is preferable.

  According to this, it is possible to support the occupant's thighs in a wider area with the support means having a larger area than the belt-like member, and tension is applied to the belt-like member. Thus, when lifting the occupant's thigh, the pressure acting on the thigh can be reduced to reduce the feeling of pressure felt by the occupant.

Here, in the seat belt device,
The support means may be a flat plate member.

Alternatively, in the seat belt device,
The support means may be an elastic member.

  The flat plate member may be formed of a metal plate or a synthetic resin. The elastic member is typically made of a hard urethane material that is harder than the cushion constituting the seat.

  The above-described effects can be obtained by any form of support means. When the support means is an elastic member, a part of the cushion material constituting the seat can be used as the elastic member, and the support means can be configured as a part of the parts constituting the seat. A more advantageous configuration in the manufacturing process can be obtained.

  ADVANTAGE OF THE INVENTION According to this invention, the seatbelt apparatus which can prevent the passenger | crew's movement to the front at the time of a collision with a simpler structure can be provided.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a schematic view showing an embodiment of a seat belt device according to the present invention as viewed from the outside in the vehicle width direction, and FIG. 2 shows an embodiment of the seat belt device according to the present invention as viewed from the front of the vehicle. FIG. 3 is a schematic diagram showing an embodiment of a seat belt device according to the present invention as viewed from above.

  As shown in FIG. 1, a seatbelt device 1 according to the present invention restrains a seated occupant M on a seat 2a and a seatback 2b of a seat 2 located on the back and lower sides of the seated occupant M. belongs to.

  The seat belt device 1 includes a webbing 3 that restrains an occupant M to a seat 2, a pretensioner 4 that applies tension to the webbing 3 at the time of collision or prediction, a retractor 5, a rear webbing guide 6, and a front webbing guide 7. The outer webbing guide 8, the inner webbing guide 9, the outer through anchor 10, the inner anchor 11, the inner through anchor 12, the tongue plate 13, and the buckle 14 are configured.

  Further, in the seat belt device 1, as shown in FIGS. 2 and 3, the webbing 3 extends in the vehicle width direction inside the seat part 2a of the seat 2, and the seat part of the seat 2 of the webbing 3 is provided. Of the portion extending inside 2a, the portion 3a located below the thigh of the occupant M is offset downward with respect to the portions 3b and 3c located on both sides of the portion 3a when viewed from the front of the vehicle. Let it be positioned.

  In addition, in the vehicle front view in FIG. 2, the broken line has shown the part 3a located under the passenger | crew M of the webbing 3 before a collision. In FIG. 3, components other than the sheet 2 and the webbing 3 are omitted.

  The webbing 3 constitutes a belt-like member, and one end of the webbing 3 is connected to the retractor 5 so that the webbing 3 can be wound, and the other end is connected to the inner anchor 11, and an intermediate part thereof is an outer through anchor 10 and a tongue plate 13. Is inserted into an inner through anchor 12 that forms a part of the inner through anchor 12.

  The pretensioner 4 is constituted by a piston and a cylinder (not shown), and when the collision is expected or when the collision is predicted, the piston is operated by the explosive force of the explosive, thereby causing the webbing 3 to have a larger winding force than the retractor 5. A tension applying means for applying a tension is configured to remove the slack of the webbing 3 to further secure the restraint of the occupant M on the seat 2. It is provided on the side floor.

  The collision detection is detected by the airbag ECU (not shown) determining whether the acceleration measured by the body acceleration sensor (not shown) is equal to or greater than the threshold, and the collision prediction is shown here. The airbag ECU predicts whether the distance to the vehicle ahead or the obstacle measured by the distance sensor that is not within the threshold is within a threshold value. The pretensioner 4 is connected to the airbag ECU by a communication standard such as CAN (Controller Area Network), and the pretensioner 4 is based on a command that is output when the airbag ECU detects or predicts a collision. Operate.

  The retractor 5 is a winding device that winds up one end of the webbing 3 with a winding spring (not shown), and prevents the webbing 3 from being pulled out from the retractor 5 by a ratchet mechanism (not shown) at the time of a collision. 2 is provided via a pretensioner 4 on a floor on the vehicle body side (not shown) outside the vehicle width direction.

  The outer through anchor 10 is provided in a center pillar (not shown) on the outer side in the vehicle width direction of the upper end of the seat back 2b of the seat 2, and the extending direction of the webbing 3 extending upward from the retractor 5 is set to the upper end of the seat back 2b. The function of changing from the outer side in the vehicle width direction of the portion toward the inner side in the vehicle width direction of the lower end portion of the seat back 2b is achieved.

  The inner through anchor 12 is provided integrally with the tongue plate 13. After the outer through anchor 10 is inserted, the inner through anchor 12 extends in the direction in which the webbing 3 extends from the vehicle width direction outer side upper side toward the vehicle width direction inner side lower side. In the upper side of the thigh of the occupant M, the function of changing from the inner side in the vehicle width direction to the outer side in the vehicle width direction is achieved.

  The buckle 14 detachably engages the tongue plate 13 and is provided on a floor on the vehicle body side (not shown) inside the seat 2 in the vehicle width direction.

  Further, the portion of the webbing 3 closer to the inner anchor 11 than the inner through anchor 12 extends from the inner side in the vehicle width direction of the seat 2 to the outer side in the vehicle width direction of the seat 2 via the upper side of the thigh of the occupant M. Then, the direction is changed by the rear webbing guide 6 located in the vicinity of the swing axis of the seat 2 with respect to the seat portion 2a of the seat back 2b and located outside in the vehicle width direction, and extends forward of the vehicle.

  Further, the webbing 3 is extended by a front webbing guide 7 positioned on the front side of the seat 2a of the seat 2 so that its extending direction is changed from the vehicle front-rear direction to the vehicle width direction. It extends over the outer webbing guide 8 located in the width direction inside and in the vicinity of the seat surface of the upper seat portion 2a, and then its extending direction is changed downward.

  The portion 3a of the webbing 3 located below the thigh of the occupant M is located below the portion 3b of the portion 3a located on the right side when viewed from the front of the vehicle. This portion 3 b is a portion located above the outer webbing guide 8 of the webbing 3.

  Further, the portion 3a of the webbing 3 is then located below the portion 3b, extends from the outside in the vehicle width direction to the inside, and is positioned in the vicinity of the seat surface in the vehicle width direction of the seat portion 2b of the seat 2. After approaching the inner webbing guide 9, its extending direction is changed upward, and is extended to the upper side of the inner webbing guide 9 to constitute a portion 3 c, and then its extending direction is changed downward, The other end of the webbing 3 is connected to the inner anchor 11.

  That is, the rear webbing guide 6, the front webbing guide 7, the outer webbing guide 8, and the inner webbing guide 9 constitute a regulating unit that regulates the extending direction of the webbing 3.

  Of the webbing 3 described above, the portion located between the outer through anchor 10 and the inner through anchor 12 restrains the chest of the occupant M against the seat back 2b of the seat 2, and the inner through anchor 12 and the rear webbing guide 6 The portion positioned between the occupant restrains the waist of the occupant M against the seat back 2b and the seat 2a.

  As described above, by extending the webbing 3 constituting the seat belt device 1 inside the seat portion 2a of the seat 2, the following operational effects can be obtained.

  First, the webbing 3 is extended inside the seat portion 2a of the seat 2 with a simpler configuration by the arrangement of the rear webbing guide 6, the front webbing guide 7, the outer webbing guide 8, and the inner webbing guide 9. Of the portion extending inside the seat portion 2a of the seat 2, the portion 3a positioned below the thigh of the occupant M is positioned below the portions 3b and 3c positioned on both sides of the portion 3a. Can be realized.

  As a result, when the pretensioner 4 applies tension to the webbing 3 at the time of a collision or the like, the portion 3a positioned below the thigh of the occupant M of the webbing 3 is pulled upward in the vehicle width direction by the tension. Since the portion 3a of the webbing 3 moves, the portion of the seat 2 located above the portion 3a of the webbing 3 and the thigh of the occupant M are lifted upward, and the occupant M moves forward of the vehicle at the time of the collision. Can be prevented.

  Thus, the lower limbs of the occupant M are prevented from colliding with an instrument panel lower panel, a steering column, or the like, which is not shown here, at the time of a collision. Injuries such as ligament damage caused by bruises, broken bones, or anterior movement of the body while the ankle is fixed can be prevented, and the lower limb injury of the occupant M can be prevented.

  Furthermore, since the tension of the webbing 3 can be increased when the waist of the occupant M moves slightly forward under the restraint of the webbing 3 at the time of the collision, the webbing 3 on the thigh of the occupant M is further increased. The binding force can be increased.

  In addition, since the waist of the occupant M moves slightly to the side under the restraint of the webbing 3 even in a side collision, the tension of the webbing 3 can be increased. The restraining force by the webbing 3 of the thigh can be increased.

  In particular, at the time of a side collision, if the restraining force by the webbing 3 on the thigh of the occupant M is weak, the occupant M tries to maintain its position with respect to the vehicle that is colliding according to the law of inertia. The impact force at the time of collision acting on the occupant M is further increased. Therefore, by increasing the restraining force by the webbing 3 as in the first embodiment, the impact force can be reduced.

  In order to prevent the occupant M from moving forward by raising the thigh of the occupant M at the time of a collision, etc., additional parts such as a link mechanism, a knee airbag, a knee bolster, and a CRD are added as in the prior art. Therefore, it is possible to eliminate a configuration that increases the number of parts, complicates the mechanism, and increases the weight and cost.

  Further, in the knee bolster, the restraint timing of the occupant M to the seat 2 at the time of the collision is delayed because the lower limbs of the occupant M collide with the instrument panel lowering the occupant M for the first time. Therefore, it is possible to prevent the timing delay.

  In the first embodiment described above, the occupant M is prevented from moving forward of the vehicle by directly lifting the occupant M's thigh upward by the portion 3a located below the thigh of the occupant M of the webbing 3. However, instead of this configuration, the following configuration may be used. The configuration is shown as Example 2 below.

  FIG. 4 is a schematic view showing another embodiment of the seat belt device according to the present invention as viewed from the front of the vehicle.

  As shown in FIG. 4, the seat belt device 21 according to the present invention is similar to that shown in the first embodiment. The seat back 2b is restrained and is a so-called three-point type.

  The seat belt device 21 includes a webbing 3 that restrains the occupant M to the seat 2, a pretensioner 4 that applies tension to the webbing 3 at the time of collision or collision prediction, a retractor 5, a rear webbing guide 6, and a front webbing guide 7. The outer webbing guide 8, the inner webbing guide 9, the outer through anchor 10, the inner anchor 11, the inner through anchor 12, the tongue plate 13, the buckle 14, and the hard urethane material 15 are configured.

  In addition, since components other than the hard urethane material 15 are the same as those of the seat belt device 1 shown in the first embodiment, the same reference numerals are given and the description thereof is omitted.

  The rigid urethane material 15 is configured in a rectangular parallelepiped shape having a vehicle longitudinal direction dimension larger than the width of the webbing 3 and a vehicle width direction dimension substantially equal to a portion 3 a positioned below the passenger M of the webbing 3. It is arrange | positioned above the part 3a located below. That is, the hard urethane material 15 constitutes a support means for supporting the elastic member, and thus the thigh of the occupant M.

  As described above, according to the seat belt device 21, the following operational effects can be obtained.

  First, the webbing 3 is extended inside the seat portion 2a of the seat 2 with a simpler configuration by the arrangement of the rear webbing guide 6, the front webbing guide 7, the outer webbing guide 8, and the inner webbing guide 9. Of the portion extending into the seat portion 2a of the seat 2, the portion 3a located below the thigh of the occupant M is offset downward with respect to the portions 3b and 3c located on both sides of the portion 3a. The following operation and effects can be obtained by positioning the hard urethane material 15 on the upper side of the portion 3a of the webbing 3.

  That is, when the pretensioner 4 applies tension to the webbing 3 at the time of a collision or the like, the portion 3a located below the thigh of the occupant M of the webbing 3 is pulled upward in the vehicle width direction by the tension and moves upward. Therefore, as the portion 3a moves upward, the rigid urethane material 15 also moves upward, and the rigid urethane material 15 lifts the thigh of the occupant M upward, and the vehicle of the occupant M at the time of the collision Forward movement can be prevented.

  Thus, the lower limbs of the occupant M are prevented from colliding with an instrument panel lower panel, a steering column, or the like, which is not shown here, at the time of a collision. Injuries such as ligament damage caused by bruises, broken bones, or anterior movement of the body while the ankle is fixed can be prevented, and the lower limb injury of the occupant M can be prevented.

  In addition to this, the portion that supports the thigh of the occupant M is not the webbing 3 but the hard urethane material 15 having a larger area than the seat belt device 1 shown in the first embodiment. When lifting the thigh, the pressure acting on the thigh of the occupant M can be reduced to relieve the feeling of pressure felt by the occupant M.

  Furthermore, since the tension of the webbing 3 can be increased when the waist of the occupant M moves slightly forward under the restraint of the webbing 3 at the time of the collision, the webbing 3 on the thigh of the occupant M is further increased. The binding force can be increased.

  In addition, since the waist of the occupant M moves slightly to the side under the restraint of the webbing 3 even in a side collision, the tension of the webbing 3 can be increased. The restraining force by the webbing 3 of the thigh can be increased.

  In particular, at the time of a side collision, if the restraining force by the webbing 3 on the thigh of the occupant M is weak, the occupant M tries to maintain its position with respect to the vehicle that is colliding according to the law of inertia. The impact force at the time of collision acting on the occupant M is further increased. Therefore, by increasing the restraining force by the webbing 3 as in the second embodiment, the impact force can be reduced.

  In order to prevent the occupant M from moving forward by raising the thigh of the occupant M at the time of a collision, etc., additional parts such as a link mechanism, a knee airbag, a knee bolster, and a CRD are added as in the prior art. Therefore, it is possible to eliminate a configuration that increases the number of parts, complicates the mechanism, and increases the weight and cost.

  Further, in the knee bolster, the restraint timing of the occupant M to the seat 2 at the time of the collision is delayed because the lower limbs of the occupant M restrain the occupant M only after colliding with the instrument panel lower panel. The seat belt device 21 can also prevent the timing delay.

  In addition, it can replace with the hard urethane raw material 15, and can also be set as the flat plate member 16 with a vehicle front-back direction dimension larger than the width | variety of the webbing 3. FIG. FIG. 5 is a schematic view showing another embodiment of the seat belt device according to the present invention as viewed obliquely from above. As shown in FIG. 5, the flat plate member 16 may be arranged on the upper side of the portion 3 a of the webbing 3 to constitute the support means. In FIG. 5, components other than the sheet 2, the webbing 3, and the flat plate member 16 are omitted.

  Also by this, the portion that supports the thigh of the occupant M is not the webbing 3 but the flat plate member 16 having a larger area. Can do. Since other functions and effects are the same as those described above, description thereof will be omitted.

  When the support means is the hard urethane material 15, a part of the cushion material (not shown) constituting the seat 2 is configured as the hard urethane material 15, and the support means is configured as a part of the components configuring the seat 2. Therefore, a more advantageous configuration can be obtained in the manufacturing process of the sheet 2.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions are made to the above-described embodiments without departing from the scope of the present invention. be able to.

  For example, as shown in FIG. 5, a portion 3d of the webbing 3 that is located between the rear webbing guide 6 and the front webbing guide 7 and extends in the vehicle front-rear direction is replaced with a wire, and the webbing 3 is divided. It is also possible.

  Furthermore, in Example 1 and Example 2 mentioned above, although the retractor 5 and the pretensioner 4 were provided in the vehicle width direction outer side of the seat 2, it is good also as a lap pretensioner system provided in the vehicle width direction inner side of the seat 2.

  In addition, the pretensioner 4 may be provided between the buckle 14 and the floor on the vehicle body side, or two pretensioners 4 are provided between the buckle 14 and the vehicle body side floor, the retractor 5 and the vehicle body side. It is good also as a structure provided in both between between floors. Alternatively, the pretensioner 4 may be provided between the buckle 14 and the vehicle body side floor, and between the inner anchor 11 and the vehicle body side floor.

  Further, in the first and second embodiments described above, the pretensioner 4 is of a type constituted by a piston and a cylinder that operate by utilizing the explosive force of a gas (not shown), but a collision or a collision is predicted. As long as the webbing 3 is given a tension larger than the winding force of the retractor 5, the webbing 3 may be of a type that gives tension by the power of a motor or the like.

  The present invention relates to a seat belt device for a vehicle, and can be applied to various vehicles such as a passenger car, a truck, and a bus.

It is a mimetic diagram showing one embodiment of a seat belt device concerning the present invention. It is a mimetic diagram showing one embodiment of a seat belt device concerning the present invention. It is a mimetic diagram showing one embodiment of a seat belt device concerning the present invention. It is a schematic diagram which shows other embodiment of the seatbelt apparatus which concerns on this invention. It is a schematic diagram which shows other embodiment of the seatbelt apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat belt apparatus 2 Seat 3 Webbing 3a The part located in the lower part of the thigh 4 Pretensioner 5 Retractor 6 Rear webbing guide 7 Front webbing guide 8 Outer webbing guide 9 Inner webbing guide 10 Outer through anchor 11 Inner anchor 12 Inner through anchor 13 tongue plate 14 buckle 15 rigid urethane material 16 flat plate member 21 seat belt device

Claims (5)

A seat belt device comprising: a belt-like member that restrains an occupant to a seat; and a tension applying unit that applies tension to the belt-like member,
While extending the belt-like member in the vehicle width direction inside the seat portion of the seat,
Of the portion of the belt-like member that extends into the seat portion of the seat, the portion located below the thigh of the occupant is positioned below the portion located on both sides of the portion. A seat belt device.   2. The seat belt device according to claim 1, further comprising: a plurality of restricting units that restrict an extending direction of the belt-like member when the belt-like member extends inside the seat.   The seat belt device according to claim 1, further comprising a support unit that supports the thigh of the occupant above a portion of the belt-like member positioned below the thigh of the occupant.   The seat belt device according to claim 3, wherein the supporting means is a flat plate member.   The seat belt device according to claim 3, wherein the supporting means is an elastic member.

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