JP2007191074A - Air belt device for vehicle - Google Patents

Abstract

An object of the present invention is to reduce the tension of an occupant restraining webbing at the time of a side collision and to inflate an inflating portion to an upper position facing a side head of the occupant.
A retractor 22 capable of reducing the tension of an occupant restraining webbing 16 (the retractor 22 is operated by an output signal from a tension reducing means and a side collision pre-crash sensor 20, and the inflator is output by an output signal from the side collision sensor. When a side collision is predicted by the side collision pre-crash sensor 20, the motor-driven retractor 22 is operated and the occupant restraining webbing 16 is pulled out in the pull-out direction. When the side collision is detected by the side collision sensor, the inflator is actuated to expand the expansion portion 18. The tension of the occupant restraining webbing 16 is reduced before the expansion portion 18 expands. Therefore, the inflating part 18 can be inflated to a larger diameter to an upper position facing the side head 14S of the occupant 14.
[Selection] Figure 3

Description

  The present invention relates to a vehicle air belt apparatus having an inflating portion corresponding to a head of an occupant during inflation.

A vehicular airbelt device is disclosed in which an occupant restraining webbing having an inflating portion is inserted into a belt guide disposed on a shoulder portion of a seatback, and the inflating portion is inflated by an inflator fixed to the seatback frame. (See Patent Document 1).
JP-T-2002-527282

  However, in the conventional example described above, the belt guide is formed in a horizontally long shape in accordance with the occupant restraining webbing, which is pressed against the occupant by the tension of the occupant restraining webbing that increases when the inflating part is inflated. Therefore, the expansion part expands widely in the lateral direction, that is, in the vehicle width direction. Therefore, it is difficult to expand the expansion part to an upper position facing the occupant's temporal region as a side collision.

  In view of the above fact, an object of the present invention is to inflate the inflatable portion to an upper position facing the occupant's temporal region in response to a side collision.

  According to a first aspect of the present invention, there is provided an occupant restraining webbing corresponding to a chest of an occupant seated on a vehicle seat, an inflating part provided on the occupant restraining webbing and corresponding to the occupant's head when inflated, and the inflation And an inflator capable of supplying a gas for inflation to the part, and prior to the operation of the inflator corresponding to a side collision, the occupant restraining webbing can be reduced in tension. .

  In the vehicular airbelt device according to the first aspect, the tension of the occupant restraining webbing can be reduced prior to the operation of the inflator corresponding to the side collision. The part is easily expanded to a larger diameter. For this reason, an expansion part can be expanded to the upper position corresponding to a passenger | crew's temporal region as a side collision response.

  According to a second aspect of the present invention, there is provided an occupant restraining webbing corresponding to an occupant's chest seated on a vehicle seat, an inflating part provided on the occupant restraining webbing and corresponding to the occupant's head when inflated, and the inflation An inflator capable of supplying inflation gas to a part, a side collision pre-crash sensor that predicts a side collision, a side collision sensor that detects a side collision, and a tension reduction that can reduce the tension of the occupant restraining webbing And a control means for operating the tension reducing means based on an output signal from the side collision pre-crash sensor and operating the inflator based on an output signal from the side collision sensor. It is said.

  In the vehicle air belt device according to the second aspect, when a side collision is predicted by the side collision pre-crash sensor, the tension of the occupant restraining webbing is reduced by the control means operating the tension reduction means. Subsequently, when a side collision is detected by the side collision sensor, the inflating portion is expanded by the control means operating the inflator. At this time, the tension of the occupant restraining webbing is reduced at the time when the side collision is predicted, and the inflatable portion is easily expanded to a larger diameter, so that the inflatable portion faces the occupant's temporal region. It can be expanded to an upper position.

  According to a third aspect of the present invention, in the vehicular airbelt device according to the second aspect, the tension reducing means is configured to wind up the occupant restraining webbing, and the occupant restraining webbing is pulled out by a motor. And the control means operates the motor of the retractor on the basis of an output signal of the side collision pre-crash sensor to extend the occupant restraining webbing in the pull-out direction. It is characterized by reducing the tension of the restraining webbing.

  In the vehicle air belt apparatus according to claim 3, since the motor-driven retractor is used as the tension reducing means, the amount of extension of the occupant restraining webbing when a side collision is predicted can be controlled more accurately. Accordingly, the tension of the occupant restraining webbing can be appropriately reduced.

  As described above, according to the vehicle airbelt device of the first aspect of the present invention, the inflatable portion can be inflated to an upper position facing the occupant's temporal region in response to a side collision. Excellent effect is obtained.

  According to the vehicular airbelt device according to claim 2, the tension of the occupant restraining webbing is reduced based on an output signal from the side collision pre-crash sensor, and the inflating portion is opposed to the occupant's temporal region. An excellent effect is obtained that it can be expanded to the right.

  According to the vehicle air belt device of the third aspect, when the side collision is predicted, an excellent effect that the tension of the occupant restraining webbing can be appropriately reduced is obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, the vehicle air belt device 10 according to the present embodiment is a kind of seat belt for restraining an occupant 14 seated on the vehicle seat 12, and includes an occupant restraining webbing 16, an inflating portion 18, It includes an inflator (not shown), a side collision pre-crash sensor 20, a side collision sensor (not shown), a retractor 22 as an example of a tension reducing unit, and a controller 24 as an example of a control unit.

  The vehicle seat 12 includes a seat cushion (not shown) on which an occupant 14 is seated, a seat back 26 that supports the back of the occupant 14, and a headrest 28 provided on the upper portion of the seat back 26. It is provided on a seat rail provided on the panel so as to be slidable in the longitudinal direction of the vehicle (not shown).

  A lap belt anchor is mounted on the outer side of the seat cushion, and a buckle device is pivotally mounted on the center side of the seat cushion, for example, so as to be swingable in the vehicle front-rear direction (both are both). Not shown). In the buckle device or outside the buckle device, for example, an inflator (not shown) that can supply an expansion gas to the expansion portion 18 is provided.

  The occupant restraining webbing 16 is a belt-like member corresponding to the chest 14B of the occupant 14 and is configured to be wound around, for example, a retractor 22 disposed on the upper back panel of the vehicle body. It can be pulled out from the retractor 22 in accordance with 14 physiques.

  A tongue plate (not shown) configured to be fitted into a buckle device is provided at, for example, the front end of the occupant restraining webbing 16. When the tongue plate is fitted into the buckle device, the gas from the inflator can be supplied from the buckle device side to the inflating portion 18. In addition, the installation position of the inflator is not limited to the buckle device side, and may be on the retractor 22 side.

  The inflatable portion 18 is a bag body that is provided on the occupant restraining webbing 16 and is folded so as to correspond to the head 14H of the occupant 14 when inflated. Specifically, the inflatable portion 18 is folded in a belt shape equivalent to the occupant restraining webbing 16, and is covered with, for example, a stretchable mesh webbing (not shown) and further covered with a cover (not shown). In other words, it is sewn in a band shape by using a control sewing, that is, a so-called tear seam that breaks when the internal pressure of the inflating portion 18 exceeds a certain level. The inflating region of the inflating part 18 is not limited to the position corresponding to the head 14H of the occupant 14 and may inflate corresponding to the chest part 14B.

  The side collision pre-crash sensor 20 is a sensor for predicting a side collision, for example, a millimeter wave provided in the vicinity of a side door that predicts that the possibility of the side collision is increased before the side collision. It is a radar or the like (not shown), and the controller 24 comprehensively determines the output signal to predict a side collision. The side collision prediction by the side collision pre-crash sensor 20 may be performed in a plurality of stages depending on the degree of unavoidable side collision. For example, a first pre-crash sensing that detects a state where a possibility of a side collision is high but a possibility of avoidance still remains, and a second pre-crash that detects that a side collision has become inevitable The sensing is performed separately, the tension of the occupant restraining webbing 16 is reduced during the first pre-crash sensing, and the inflator is activated when the second pre-crash sensing is performed, so that the inflating portion 18 is inflated. You may make it make it.

  The side collision sensor is an acceleration sensor for detecting a side collision, for example, detecting a side collision after a side collision. The side collision sensor is provided, for example, on a side part (B pillar or side door) of the vehicle and connected to the controller 24. ing. The signal used when the controller 24 determines the side collision is not limited to the output signal from the side collision sensor, but from a center airbag sensor (detecting acceleration in the vehicle width direction) provided in the controller 24, or the like. Output signals are also included. The controller 24 comprehensively determines output signals from these sensors to detect a side collision.

  The retractor 22 is configured so that the occupant restraining webbing 16 can be wound, and the occupant restraining webbing 16 can be extended in the pull-out direction by the motor 30. Specifically, the retractor 22 includes a spool 32 that can wind up the occupant restraining webbing 16 and a motor 30 that can rotationally drive the spool 32 in the pull-out direction of the occupant restraining webbing 16. The spool 32 is biased in the winding direction of the occupant restraining webbing 16 during normal use, and automatically winds up an excess portion when the occupant restraining webbing 16 is not attached, and the occupant restraining webbing 16 by the occupant 14. At the time of wearing, an appropriate tension can be applied to the passenger restraining webbing 16. As shown in FIG. 1, the occupant restraining webbing 16 is pulled out from the retractor 22 to the upper side of the vehicle, so that the occupant restraint webbing 16 is guided from the shoulder portion of the seat back 26 to the front side. In addition, a belt guide 34 is provided in the vicinity of the shoulder.

  The controller 24 operates the motor 30 of the retractor 22 based on the output signal of the side collision pre-crash sensor 20 to draw out the occupant restraining webbing 16 in the pull-out direction to reduce the tension of the occupant restraining webbing 16, and When a side collision is detected based on the output signal of the bump sensor, the inflator is operated to expand the expansion portion 18.

(Function)
This embodiment is configured as described above, and the operation thereof will be described below. In FIG. 1, in the vehicle airbelt device 10, when the occupant 14 is seated on the vehicle seat 12 and the occupant restraining webbing 16 is attached during normal use, the occupant restraint urged in the winding direction by the retractor 22. The passenger 14 can be appropriately restrained by the webbing 16 for use.

  Next, in FIG. 2, when a side collision of the vehicle is predicted by the side collision pre-crash sensor 20, the controller 24 operates the motor 30 of the retractor 22, so that the spool 32 rotates in the direction opposite to the winding direction. Thus, the occupant restraining webbing 16 is extended in the pull-out direction (arrow A direction), and the tension of the occupant restraining webbing 16 that restrains the occupant 14 is reduced.

  Subsequently, in FIG. 3, when a side collision is detected by the side collision sensor, the expansion unit 18 is expanded by the controller 24 operating the inflator. At this time, when the side collision is predicted, the tension of the occupant restraining webbing 16 is reduced, and the inflatable portion 18 is easily expanded to a larger diameter. It can be expanded to an upper position facing the portion 14S.

  On the other hand, when the side collision is predicted by the side collision pre-crash sensor 20 and the side collision is not detected because the side collision is avoided, the controller 24 causes the motor 30 of the retractor 22 to be detected. Can be operated in the winding direction to immediately return the occupant restraining webbing 16 to its original state.

  The side collision prediction by the side collision pre-crash sensor 20 can be performed in a plurality of stages depending on the inevitable degree of the side collision. Specifically, for example, the first pre-crash sensing for detecting a state where the possibility of side collision is high but the possibility of avoidance is still left, and detecting that the side collision has become inevitable The second pre-crash sensing is performed separately, the tension of the occupant restraining webbing 16 is reduced during the first pre-crash sensing, and the inflator is actuated when the second pre-crash sensing is performed. 18 may be inflated. In this case, it is possible to inflate the expanding portion 18 at an earlier stage than when the side collision is detected by the side collision sensor, that is, before the side collision actually occurs. When the tension of the occupant restraining webbing 16 is reduced and the expansion portion 18 is expanded only by pre-crash sensing, the side collision sensor need not be used as a trigger for inflator operation.

  In the vehicle air belt device 10, the motor-driven retractor 22 is used to reduce the tension of the occupant restraining webbing 16, so that the amount of extension of the occupant restraining webbing 16 when a side collision is predicted is more accurate. The tension of the occupant restraining webbing 16 can be appropriately reduced. In addition, this can assist in increasing the expansion diameter of the expansion portion 18, particularly the expansion diameter in the vehicle vertical direction, so that the head 14H can be more stably restrained and the vehicle width of the head 14H can be increased. The outward movement in the direction can be suppressed and the inertial force of the head 14H can be absorbed.

  In the above embodiment, the retractor 22 is used as an example of the tension reducing means. However, the tension limiting means is not limited to this, and the tension of the occupant restraining webbing 16 can be reduced prior to the operation of the inflator. Any means can be used as long as it is possible. Further, the position of the retractor 22 is not limited to the illustrated position, and may be, for example, the back surface of the seat back 26 or the inside of a pillar (not illustrated). Furthermore, although the controller 24 was mentioned as a control means, it is not restricted to this, You may make it give the same function to various control units, such as airbelt ECU.

Side view schematically showing a state in which an occupant is seated on a vehicular seat where a vehicular airbelt device is installed and a occupant restraining webbing is mounted, and a connection between a side collision pre-crash sensor, a controller and a retractor in the vehicular airbelt device It is a block diagram which shows a state. In the state of FIG. 1, the side collision is estimated by the side collision pre-crash sensor, and the retractor motor is operated to extend the occupant restraining webbing in the pull-out direction to show a state in which the tension is reduced. . FIG. 3 is a side view and a block diagram showing a state in which the inflating portion is greatly inflated to an upper position facing the occupant's temporal region in the state of FIG. 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle air belt apparatus 12 Vehicle seat 14 Occupant 14B Chest 14H Head 16 Occupant restraint webbing 18 Expansion part 20 Side collision pre-crash sensor 22 Retractor (tension reduction means)
24 controller (control means)
30 motor

Claims (3)

An occupant restraining webbing corresponding to the chest of the occupant seated in the vehicle seat;
An inflatable portion provided on the occupant restraining webbing and corresponding to the occupant's head when inflated;
An inflator capable of supplying an inflating gas to the inflating part,
Prior to the operation of the inflator corresponding to a side collision, the vehicle air belt apparatus is configured to be able to reduce the tension of the occupant restraining webbing. An occupant restraining webbing corresponding to the chest of the occupant seated in the vehicle seat;
An inflatable portion provided on the occupant restraining webbing and corresponding to the occupant's head when inflated;
An inflator capable of supplying an expansion gas to the expansion part;
Side collision pre-crash sensor that predicts side collisions,
A side collision sensor that detects a side collision;
Tension reducing means capable of reducing the tension of the occupant restraining webbing;
Control means for operating the tension reducing means based on an output signal from the side collision pre-crash sensor and operating the inflator based on an output signal from the side collision sensor;
A vehicular airbelt device comprising: The tension reducing means is a retractor configured so that the occupant restraining webbing can be wound, and the occupant restraining webbing can be extended in a pull-out direction by a motor,
The control means operates the motor of the retractor based on an output signal of the side collision pre-crash sensor, and draws out the occupant restraint webbing in the pull-out direction to reduce the tension of the occupant restraint webbing. The vehicle air belt device according to claim 2.

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