JP2007216872A - Vehicular air belt device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inflate an inflation part in a wider range in a vehicle vertical direction on a side of a head of an occupant without making the inflation part into a large capacity. <P>SOLUTION: The vehicular air belt device has the inflation part 18 inflated corresponding to the head part 14H of the occupant by receiving feeding of a gas from an inflator and constituted such that an inflation shape on the side of the head part 14H becomes a longitudinally long shape small in a vehicle width direction and large in a vehicle vertical direction on an occupant restraint webbing 16. Inertia force in the vehicle width direction of the head part 14H of the occupant 14 in side surface collision or the like is absorbed by the inflation part 18 inflated into a longitudinally long shape. Thereby, the head part 14H can be protected more efficiently. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle air belt device.

An inflatable seat belt device is disclosed in which a second anchor is provided between an upper anchor and a tongue plate of an occupant restraining webbing, and an inflatable portion between the two anchors is inflated in a spherical shape to protect the occupant's head during a side collision. (See Patent Document 1).
JP-A-6-64493

  However, in the above-described conventional example, the expansion position of the expansion portion for protecting the head is determined by the second anchor disposed at the height position of the occupant's shoulder, and the expansion portion expands in a spherical shape. In order to expand the expansion part widely in the vertical direction on the side of the head higher than the shoulder, it is necessary to increase the diameter of the expansion part, and for that purpose, it is necessary to increase the capacity of the expansion part. It is done.

  In view of the above fact, an object of the present invention is to expand the inflatable portion to a wider range in the vehicle vertical direction on the side of the occupant's head without increasing the capacity of the inflatable portion.

  The invention according to claim 1 is an occupant restraining webbing corresponding to an occupant's chest, and an inflating part provided on the occupant restraining webbing and inflated in response to the supply of gas from an inflator The expansion part in the vehicle vertical direction so that the expansion shape of the expansion part on the side of the head is a vertically long shape that is small in the vehicle width direction and large in the vehicle vertical direction. And a non-extensible cover that restricts expansion in the vehicle width direction.

  In the vehicle air belt device according to the first aspect, the inflating portion provided in the occupant restraining webbing is inflated in response to the occupant's head upon receipt of the gas supplied from the inflator. At this time, the expansion shape of the expansion portion on the side of the head is regulated by a non-extensible cover that covers the expansion portion, and becomes a vertically long shape that is small in the vehicle width direction and large in the vehicle vertical direction. Without increasing the capacity of the vehicle, it is possible to expand the expansion portion to a wider range in the vehicle vertical direction on the side of the occupant's head.

  According to a second aspect of the present invention, in the vehicular inflatable belt device according to the first aspect, the expanding portion is made of a stretchable material.

  In the vehicular airbelt device according to the second aspect of the present invention, since the inflatable portion is made of a stretchable material, the inflatable portion may locally inflate in a vertically long shape on the side of the occupant's head. It becomes easy.

  According to a third aspect of the present invention, in the vehicle air belt device according to the first or second aspect, at least an upper surface of both surfaces of the cover extends in a longitudinal direction of the occupant restraining webbing, and the vehicle of the inflating portion is provided. It is characterized in that a slit that allows bulging in the vertical direction is provided.

  In the air belt device for a vehicle according to claim 3, a slit is provided on at least an upper surface of both surfaces of the cover to allow the inflating portion to bulge in the vehicle vertical direction, and the slit is a longitudinal direction of the occupant restraining webbing. Therefore, the expansion of the expansion portion in the vehicle width direction is restricted by the non-slit portion of the cover. By restricting the expansion in the vehicle width direction, it is possible to expand the expansion portion through the slit more greatly at least above the vehicle, and to expand the wide range in the direction in which the slit extends.

  As described above, according to the vehicle air belt device of the first aspect of the present invention, the inflatable portion can be moved in the vehicle vertical direction on the side of the occupant's head without increasing the capacity of the inflatable portion. The excellent effect that it can expand | swell to a wide range is acquired.

  According to the vehicle air belt device of the second aspect, it is possible to obtain an excellent effect that the inflatable portion is easily locally inflated in a vertically long shape on the side of the occupant's head.

  According to the vehicle air belt device of the third aspect, it is excellent that the inflatable portion can be bulged at least above the vehicle through the slit and can be inflated in a wide range in the extending direction of the slit. An effect is obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, a vehicle air belt device 10 according to the present embodiment is a kind of seat belt device for restraining an occupant 14 seated on a vehicle seat 12, and includes an occupant restraining webbing 16, an inflating portion 18, and the like. have.

  The vehicle seat 12 includes a seat cushion 20 on which an occupant 14 is seated, a seat back 22 that supports the back of the occupant 14, and a headrest 24 provided on the upper portion of the seat back 22, and is provided on a floor panel. It is provided on the seat rail so as to be slidable in the longitudinal direction of the vehicle (not shown).

  A lap belt anchor 26 is provided on the outer side of the seat cushion 20 and a buckle device 28 is provided on the center side of the seat cushion 20. The position where the lap belt anchor 26 and the buckle device 28 are provided is not limited to the seat cushion 20 and may be on the floor panel side, for example. In the buckle device 28 or outside the buckle device 28, for example, an inflator, which is a gas supply source for the inflating portion 18, is disposed (not shown). For example, the inflator is activated when a side collision is detected by a side collision sensor (not shown), when a side collision is predicted by a pre-crash sensor (not shown), or when a rollover is detected by various sensors. Yes.

  When the inflating portion 18 is also made to correspond to the chest 14B of the occupant 14, the inflator is activated even when a frontal collision is detected or predicted. In this case, a single inflator with variable output may be used.

  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 (not shown) disposed on a pillar of the vehicle body. It can be pulled out from the retractor according to the physique of the occupant 14. The occupant restraining webbing 16 pulled out from the retractor is guided to the front side of the seat back 22 by being guided by a shoulder anchor 30 provided in the pillar, for example.

  The occupant restraining webbing 16 is provided with a tongue plate 32 that can be fitted into the buckle device 28. When the tongue plate 32 is fitted into the buckle device 28, the buckle device 28 moves from the buckle device 28 side to the inflating portion 18. The gas from the inflator can be supplied.

  A lap belt 34 corresponding to the waist 14W of the occupant 14 is fixed to a lap belt anchor 26 provided on the outer side of the passenger compartment of the vehicle seat 12, and the tip of the lap belt 34 is connected to the tongue plate 32. Has been. The lap belt 34 and the occupant restraining webbing 16 may be configured as one webbing so that the tongue plate 32 can be moved in accordance with the physique of the occupant 14.

  The inflatable portion 18 is a bag body provided on the occupant restraining webbing 16 and inflated in response to the head 14H of the occupant 14 when gas is supplied from the inflator. For example, an inflatable rubber tube 42 is meshed. It is configured to be covered with a webbing 38.

  Specifically, in FIG. 6A, the mesh webbing 38 can handle tension generated in the occupant restraining webbing 16 when restraining the occupant 14 and expands as the inflating portion 18 expands. It has sex. In FIG. 1, when the occupant 14 wears the occupant restraining webbing 16, the mesh webbing 38 is arranged so as to correspond to, for example, a range from a portion close to the tongue plate 32 to the rear of the shoulder portion of the seat back 22. It is installed.

  The cover 40 covers the inflating portion 18, and the inflating portion 18 on the side of the head portion 14 </ b> H has a vertically long shape that is small in the vehicle width direction and large in the up-down direction of the vehicle. Non-extensible covering member that allows expansion in the direction and restricts expansion in the vehicle width direction, and corresponds to the head 14H of the occupant 14 when the occupant 14 wears the occupant restraining webbing 16 And it is arrange | positioned in the range straddling at least front and back of the shoulder part 14S. For example, both sides of the cover 40 in normal use are provided with slits 40S along the longitudinal direction of the occupant restraining webbing 16, so that the inflating portion 18 can inflate in the vehicle vertical direction through the slit 40S. It has become.

  The slit 40S is an opening portion that extends in the longitudinal direction of the occupant restraining webbing 16 and allows the inflating portion 18 to bulge in the vehicle vertical direction. The slit 40S has a range in the vehicle longitudinal direction of the inflating portion 18. It is determined corresponding to. For example, it is desirable that the range of the slit 40S is wider than the front-rear width of the head 14H. However, since the cover 40 restricts the expansion of the inflating portion 18 in the vehicle width direction, both ends of the slit 40S terminate without reaching the both ends of the cover 40, and both ends of the cover 40 are inflating the inflating portion. It is desirable that they are connected in the circumferential direction even when 18 is expanded.

  As shown in FIG. 6 (A), the inflatable portion 18 is folded into a belt shape during normal use and covered with a mesh webbing 38 and a cover 40, and is so-called control sewing that breaks when the internal pressure of the inflatable portion 18 exceeds a certain level. It is sewn in a band shape using a tear seam.

  Note that the range in which the cover 40 covers the mesh webbing 38 is not limited to the illustrated range, and may be the entire mesh webbing 38 as long as the slit 40S is provided at an appropriate position. In this case, in a case where the inflating portion 18 is also made to correspond to the chest 14B of the occupant 14, for example, the predetermined portion of the cover 40 is caused by the inflating force of the inflating portion 18 so that the cover 40 does not hinder the inflating of the inflating portion 18. Configure to cleave.

(Function)
This embodiment is configured as described above, and the operation thereof will be described below. In FIG. 1, in the vehicular airbelt device 10 according to the present embodiment, an occupant 14 seated on a vehicle seat 12 pulls out an occupant restraining webbing 16 from a retractor (not shown) and circulates it in front of a chest 14B. The occupant restraining webbing 16 can be mounted by winding the 34 around the waist 14W and fitting the tongue plate 32 into the buckle device 28. At this time, the mesh webbing 38 is located in a range from a portion close to the tongue plate 32 to the rear of the shoulder portion of the seat back 22, and the cover 40 is located in a range straddling the front and rear of the shoulder portion 14S. Further, when the tongue plate 32 is fitted into the buckle device 28, gas can be supplied from the inflator on the buckle device 28 side to the inflating portion 18.

  Next, when a side collision is detected by the collision sensor, when a side collision is predicted by a pre-crash sensor (not shown), or when a rollover is detected by various sensors, the inflator is activated and the inflator is activated. A large amount of gas is supplied to the expansion part 18 from the buckle device 28 and the gas flow path of the tongue plate 32, and the expansion part 18 expands as shown in FIGS. At this time, in FIG. 3, FIG. 4 and FIG. 6B, the expansion shape of the expansion portion 18 on the side of the head 14H is regulated by the non-extensible cover 40. Can not do it.

  On the other hand, the inflating portion 18 can swell in the vehicle vertical direction while widening the slit 40S through the slits 40S provided on both surfaces of the cover 40, and the amount of expansion in the vehicle width direction is regulated. It is possible to expand in a wider range in a direction in which the slit 40S extends while expanding more vertically and vertically. Since the inflatable portion 18 is formed by covering the rubber tube 42 with the mesh webbing 38, a strap or the like (not shown) cannot be provided inside, and it is difficult to regulate the inflated shape to a shape other than a circular cross section. However, in the present embodiment, by providing the slit 40S in the cover 40, it is possible to regulate the expansion shape of the expansion portion 18 with a simple configuration. Further, since the rubber tube 42 is extensible, it is easy to locally expand through the slit 40S.

  As described above, in the vehicle air belt device 10, the non-slit portion of the cover 40 restricts the expansion portion 18 from expanding in the vehicle width direction, and the slit 40 </ b> S allows the vehicle to expand in the vertical direction. Without inflating the capacity, the inflatable portion 18 can be inflated to a wider range in the vehicle vertical direction on the side of the head 14H of the occupant 14. Then, by absorbing the inertia force in the vehicle width direction of the head 14H of the occupant 14 with the inflatable portion 18, the head 14H can be efficiently protected.

  In the above embodiment, the slit 40S is provided on both surfaces of the cover 40 in order to allow the expansion portion 18 to expand in the vehicle vertical direction. However, the slit 40S is provided on at least the upper surface of both surfaces of the cover 40. Just do it. Further, instead of the slit 40 </ b> S, a cleavage portion that is cleaved by the expansion force of the expansion portion 18 may be provided.

  Further, the cover 40 with the slit 40S is used in order to regulate the expansion shape of the expansion portion 18, but the present invention is not limited to this, and the position corresponding to, for example, the head 14H of the occupant 14 in the occupant restraining webbing 16. In FIG. 1, the inflatable portion 18 is exposed, both sides in the longitudinal direction are covered with non-extensible covers (not shown), and the inflated portions 18 that are exposed are suppressed by suppressing the expansion of the portions covered with the cover. It is good also as a structure which expands locally to the side of the head 14H.

FIG. 3 is a front view showing a state in which an occupant is seated on a vehicle seat provided with a vehicle air belt device and occupant restraining webbing is mounted. It is an expansion perspective view which shows the cover and expansion | swelling part at the time of normal use. In the state of FIG. 1, it is a front view which shows the state which the expansion part expanded greatly in the vehicle up-down direction through the slit of the cover. It is a side view which shows the state which the expansion part expanded greatly in the vehicle up-down direction through the slit of the cover. FIG. 5 is a perspective view showing a state in which the inflating portion is greatly inflated in the vehicle vertical direction through a slit in the cover in the passenger restraint webbing alone. (A) It is 6A-6A arrow sectional drawing in FIG. 2 which shows the structure inside a cover and an expansion | swelling part. (B) 6B-6B arrow sectional drawing in FIG. 5 which shows the state which the expansion | swelling part expanded greatly to the vehicle up-down direction, expanding this slit through the slit of a cover.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle air belt apparatus 14 Crew 14H Head 16 Crew occupant restraining webbing 18 Expansion part 40 Cover 40S Slit

Claims (3)

An occupant restraining webbing corresponding to the chest of the occupant,
An inflatable portion provided on the occupant restraining webbing and inflated corresponding to the occupant's head upon receipt of a gas supply from an inflator;
Covering the inflatable portion and allowing the inflatable portion to expand in the vehicle up-down direction so that the inflated shape of the inflatable portion on the side of the head is a vertically long shape that is small in the vehicle width direction and large in the vehicle up-down direction. And a non-extensible cover that regulates expansion in the vehicle width direction,
A vehicular airbelt device comprising:   The vehicular air belt device according to claim 1, wherein the inflatable portion is made of a material having extensibility.   2. A slit extending in a longitudinal direction of the occupant restraining webbing and allowing the inflating portion to bulge in a vehicle vertical direction is provided on at least an upper surface of both surfaces of the cover. Alternatively, the vehicle air belt device according to claim 2.

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