JP2000108832A - Air belt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely break a cover covering the webbing of the shoulder belt of an air belt device in a side not opposite the neck of an occupant. SOLUTION: A portion of the shoulder belt 6 of an air belt device brought into contact without the breast part of an occupant is composed of a cylindrically formed and expandable bag 12, a webbing 13 covering its outer side to support a load at the time of vehicle clashing, and a cover 28 covering the outer side thereof. The cover 28 has a two-layer structure, the outer layer being made of soft base cloths 29 and 30 such as moquette or the like, and the inner layer being an elastic pad 35. Of the sewn parts 31 and 33 of the base cloths 29 and 30, by setting the sewn strength of the second sewn part 32 not facing the neck of the occupant to be low compared with the sewn strength of the first sewn part 31 facing the neck of the occupant, the second sewn part 32 is broken at the time of vehicle clashing to prevent the webbing 13 from directly touching the neck of the occupant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air belt device for inflating a shoulder belt for restraining an occupant to a seat at the time of a collision of a vehicle with gas supplied from an inflator.

[0002]

2. Description of the Related Art A bag is stored inside a seat belt,
An air belt device that inflates the bag at the time of a vehicle collision to softly restrain an occupant is disclosed in, for example, Japanese Patent Application Laid-Open No. 6-5600.
No. 1 has already known this.

[0003]

The shoulder belt of such an air belt device is composed of an outer webbing and an inner bag, and the webbing increases in diameter following the inflation of the bag and can simultaneously contract in the longitudinal direction. Has a warp knit mesh structure. Therefore, the surface of the webbing is rough and coarse, and the feeling when the upper portion of the shoulder belt directly hits the occupant's neck without passing through clothes is not always preferable. Therefore, it is conceivable to improve the wearing feeling of the occupant by covering the outer surface of the webbing with a soft material such as a tricot or a moquette. When the webbing is covered with the cover in this way, it is necessary to consider that the cover does not break when the shoulder belt expands and does not hinder the expansion of the shoulder belt. It is necessary to consider that the cover is broken on the side not facing the occupant's neck so that the cover is interposed therebetween.

The present invention has been made in view of the above circumstances, and has as its object to reliably break a cover for covering a webbing of a shoulder belt of an air belt device on a side not facing a neck of an occupant.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a shoulder belt for restraining an occupant to a seat comprises a bag capable of being inflated by gas generated by an inflator, An air belt device comprising: a webbing that covers the outer surface of the webbing to support a load generated by a collision; and a cover that covers the outer surface of the webbing and breaks when the bag is inflated. The cloth and the outer base cloth are sewn in a cylindrical shape at first and second sewing portions along both end edges thereof, and the stiffness of the occupant is compared with the sewing strength of the first sewn portion on the side facing the occupant's neck. The sewing strength of the second sewing portion on the side that is not opposed to is set low.

According to the above construction, since the surface of the webbing of the air belt device is covered with the cover, the feel of the webbing in contact with the occupant is improved, and the occupant's uncomfortable feeling when wearing the air belt device can be reduced. Moreover, the webbing can be protected from damage. Of the first and second sewn portions along both end edges of the base cloth of the cover, the second sewn portion on the side that does not face the occupant's neck is compared with the sew strength of the first sewn portion on the side facing the occupant's neck. Since the sewing strength is set low, when the airbag and the webbing are inflated due to the collision of the vehicle, the second sewing portion is broken to prevent the webbing from directly contacting the neck of the occupant.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the sewing thread of the second sewing portion is made thinner than the sewing thread of the first sewing portion.

According to the above construction, the sewing thread in the second sewing section is made thinner than the sewing thread in the first sewing section, so that the sewing strength of the second sewing section is reduced and the second sewing section is reliably broken. can do.

According to a third aspect of the present invention, in addition to the configuration of the first aspect, the second sewing pitch of the first sewing portion is larger than that of the first sewing portion.
The sewing pitch of the sewn portion is made coarse.

According to the above configuration, the sewing pitch of the second sewing portion is made coarser than the sewing pitch of the first sewing portion.
The sewing strength of the sewn portion is reduced, and the second sewn portion can be reliably broken.

According to a fourth aspect of the present invention, the shoulder belt for restraining the occupant to the seat supports the bag inflatable with the gas generated by the inflator and the load generated by the collision by covering the outer surface of the bag. An air belt device having a webbing that covers the outer surface of the webbing and a cover that breaks when the bag is inflated, wherein the cover covers both sides of the webbing with a base fabric folded in two at a folding line, and covers both ends of the base fabric. The edges are sewn in a tubular shape at a sewn portion, and the fold line is arranged on the side facing the neck of the occupant, and the sewn portion is arranged on the side not facing the neck of the occupant.

According to the above configuration, since the surface of the webbing of the air belt device is covered with the cover, the feel of the webbing in contact with the occupant is improved, and the occupant's discomfort when the air belt device is worn can be reduced. Moreover, the webbing can be protected from damage. Since the sewn portion of the base fabric of the cover folded in two at the fold line is arranged on the side not facing the occupant's neck, when the airbag and the webbing inflate due to the collision of the vehicle, the sewn portion between the occupant's neck and the webbing. The base fabric can be reliably interposed to prevent the webbing from directly contacting the occupant's neck.

According to a fifth aspect of the present invention, in addition to any one of the first to fourth aspects, a cushioning material is laminated on an inner surface of the cover.

According to the above configuration, since the cushioning material is laminated on the inner surface of the cover, not only the touch of the cover is further improved, but also the shock absorption of the cover can be improved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

1 to 7 show a first embodiment of the present invention. FIG. 1 is a side view of a front seat portion of a vehicle, FIG. 2 is a view in the direction of arrow 2 in FIG. 1, and FIG. 3 is an air belt device. Perspective view of the
4 is an enlarged sectional view taken along line 4-4 of FIG. 3, FIG. 5 is a view taken in the direction of arrow 5 in FIG. 3, FIG. 6 is a sectional view taken along line 6-6 of FIG. 5, and FIG. It is.

As shown in FIGS. 1 to 3, an air belt device for restraining an occupant (driver in the embodiment) to a front right seat 1 includes a shoulder belt retractor 3 provided below a center pillar 2 and a retractor 3 for the shoulder belt. A lap belt retractor 4 provided below the shoulder belt retractor 3, a shoulder belt 6 pulled out from the shoulder belt retractor 3 and extending through a slip guide 5 provided above the center pillar 2, A lap belt 7 pulled out from the belt retractor 4,
A tongue device 8 fixed to the ends of the shoulder belt 6 and the lap belt 7, a buckle device 9 fixed to a seat base 10 made of a seat frame or a slide rail, and a buckle device 9 to which the tongue device 8 is connected. And an inflator 11 provided integrally.

The known shoulder belt retractor 3 and lap belt retractor 4 rewind the shoulder belt 6 and the lap belt 7, respectively, so that an acceleration sensor (not shown) detects acceleration equal to or higher than a predetermined value. At normal times, the belts 6 and 7 can be pulled out to allow the movement of the occupant's body. When the acceleration sensor detects an acceleration equal to or more than a predetermined value during a vehicle collision, the belts 6 and 7 cannot be pulled out. It locks and restrains the occupants. Known inflator 1
1 ignites when the acceleration sensor detects acceleration equal to or higher than a predetermined value, and generates high-pressure gas by combustion of the propellant.

As shown in FIG. 3, FIG. 5, and FIG. 6, the lap belt 7 is formed of a normal synthetic fiber plain woven belt. On the other hand, a portion of the shoulder belt 6 that comes into contact with the occupant's chest and the right nape is a bag 12 formed into a cylindrical shape and folded flat, and a webbing that covers the outside and generates tension when a vehicle collides. 13 and a cover 28 that further covers the outside. Normally, the shoulder belt 6 has a flat band shape, but when gas is supplied from the inflator 11 to the bag 12, the shoulder belt 6 expands to the state shown in FIGS. 1 and 2 and softly restrains the occupant. When the webbing 13 made of a warp knit expands in the radial direction with the inflation of the bag 12, it contracts in the longitudinal direction by that amount to generate initial tension on the shoulder belt 6. At this time, the cover 28 is broken along the longitudinal direction so as not to hinder the expansion of the shoulder belt 6.

The cover 28 is formed by forming an inner base cloth 29 and an outer base cloth 30 made of a soft material such as a tricot or a moquette with a first sewing portion 31 and a second sewing portion 32 along both side edges thereof in a cylindrical shape. To be sewn. When the air belt device is worn, the inner base fabric 29 is located on the side in contact with the occupant's chest, and the outer base fabric 30 is located on the opposite side.
The first sewn portion 31 is located on the side of the both edges of the shoulder belt 6 facing the occupant's neck, and the second sewn portion 32
Is located on the opposite side (the side not facing the occupant's neck). In the first and second sewing portions 31 and 32, the inner base fabric 2
The base fabric 9 and the outer base fabric 30 are overlapped with their both end edges folded in a double state, and sewn with sewing threads 33 and 34, respectively. The sewing thread 34 of the second sewing section 32 is
The second sewing portion 32 is more easily broken than the first sewing portion 31.
On the inner surfaces of the inner base fabric 29 and the outer base fabric 30, cushion members 35, 35 that are in contact with the outer surface of the webbing 13 are laminated. The cushion members 35, 35 are made of an elastic urethane sheet or the like.

The shoulder belt 6 comes into contact with the chest from the neck of the occupant to the flank, but the surface is covered with a flexible cover 28 so that the feel is improved and the occupant may feel uncomfortable due to wearing of the air belt device. It is possible to contribute to the improvement of the mounting rate by reducing it. In addition, even if the shoulder belt 6 expanded at the time of collision of the vehicle strongly adheres to the occupant's body, the occupant can be softly restrained by the presence of the cover 28. In particular, the inner base cloth 29 and the outer base cloth 30 of the cover 28 The cushioning effect can be further enhanced by the cushion materials 35, 35 laminated on the surface. Further cover 28
It is possible not only to improve the aesthetic appearance by adding a color or pattern to the surface of the webbing, but also to prevent the webbing 13 from being damaged by mischief or from being brought into contact with the occupant's accessories. Become.

As is apparent from FIG. 4, the buckle device 9
The inflator 11 is fixed to a lower portion of the buckle housing 14 constituting the main body, and a buckle 15 is fixed to an upper portion thereof. The lower end of the anchor member 17 whose upper end is fixed to the buckle housing 14 with the bolt 16 is
It is supported by the seat base 10 via the fulcrum pin 18 so as to be able to swing back and forth. The connection port 19 opened on the upper wall of the buckle housing 14 and the inflator 11 communicate with each other through a gas passage 20 formed inside the buckle housing 14.

The bag 12 of the shoulder belt 6 fitted to the upper outer peripheral surface of the tongue housing 21 of the tongue device 8,
The webbing 13 and the cover 28 and the lap belt 7 superposed on the outside thereof are fixed by being fastened by the annular holder 22. The tongue 23 having the upper half embedded in the tongue housing 21 is
2. It is fixed to the tongue housing 21 by bolts 24 penetrating the lap belt 7, the cover 28, the webbing 13 and the bag 12. On the lower surface of the tongue housing 21,
A connection pipe 25 that can be inserted into the connection port 19 of the buckle housing 14 protrudes. A gas passage 26 that connects the connection port 19 to the inside of the bag 12 is formed inside the tongue housing 21 and the connection pipe 25. A release button 27 (see FIG. 3) for separating the tongue 23 connected to the buckle 15 is provided on the buckle housing 14.

Next, the operation of the embodiment of the present invention having the above configuration will be described.

As shown in FIG. 4, when the tongue 23 of the tongue device 8 is connected to the buckle 15 of the buckle device 9 to mount the air belt device, the connection pipe 25 of the tongue device 8 is inserted into the connection port 19 of the buckle device 9. Is done.

When the acceleration sensor detects an acceleration equal to or higher than a predetermined value due to a vehicle collision, the inflator 11 ignites to generate high-pressure gas, and the generated gas is supplied to the gas passage 20 of the buckle housing 14 and the gas passage of the tongue housing 21. It is supplied into the bag 12 of the shoulder belt 6 via 26 and the bag 12 is inflated. As shown in FIG. 7, when the webbing 13 is inflated by the pressure at which the bag 12 inflates, the pressure acts on the inner surface of the cover 28.
At this time, the inner base cloth 29 and the outer base cloth 3 of the cover 28
First sewing part 31 and second sewing part 3 that sew 0 in a cylindrical shape
2, the second sewing portion 32 in which the thin sewing thread 34 is used is broken to allow the bag 12 and the webbing 13 to expand. When the shoulder belt 6 expands in this way, the contact area with the occupant's chest increases compared to the shoulder belt 6 before expansion, so that the occupant can be restrained more softly.

As described above, when the shoulder belt 6 expands, the first sewing portion 31 and the second
The first sewn portion 3 of the sewn portion 32 facing the neck of the occupant
1 does not break, and the second sewn portion 32 on the opposite side breaks, so that the cover 28 with a good feel can be reliably interposed between the webbing 13 and the occupant's neck not covered by clothes. Becomes

Next, a second embodiment of the present invention will be described with reference to FIG.

In the second embodiment, the first sewing portion 3 of the cover 28
The structure of the first and second sewing portions 32 is different from that of the first embodiment. That is, in the first embodiment, the second sewing portion 32
The sewing thread 34 of the first sewing section 31 is made thinner than the sewing thread 33 of the first sewing section 31 to break the second sewing section 32. In the second embodiment, the sewing pitch P of the sewing thread 34 of the second sewing section 32 is reduced. ₂ first
It is rougher than sewing pitch P ₁ of the sewing thread 33 of the sewing unit 31. When a load is applied to the sewing thread 33 of the first sewing section 31 and the sewing thread 34 of the second sewing section 32, the sewing pitch P
_{Since a} large load concentrates on the sewing thread 34 of the second sewing portion 32 where the second portion ₂ is coarse, the second sewing portion 32 can be broken at an early stage.

Next, a third embodiment of the present invention will be described with reference to FIG.

In the first and second embodiments, the cover 28 has an inner base cloth 29 and an outer base cloth 30. In the third embodiment, a single base cloth 36 folded in two at the fold line 37 is used. Covers the bag 12 and the webbing 13 with
Both end edges of the base cloth 36 are sewn with sewing threads 39 at a sewing portion 38. At this time, the fold line 37 of the base cloth 36 is located on the side facing the neck of the occupant, and the sewing portion 38 is located on the opposite side (the side not facing the neck of the occupant).

According to the present embodiment, the shoulder belt 6
When the base cloth 36 is inflated, the sewn portion 3 that does not face the neck of the occupant is
8, the same operation and effect as those of the first and second embodiments can be obtained.

Next, a fourth embodiment of the present invention will be described with reference to FIG.

The fourth embodiment is an improvement of the third embodiment,
The structure of the sewing portion 38 is different. In the third embodiment, the sewing thread 39 of the sewing portion 38 is visible from the outside. In the fourth embodiment, the sewing portion 38 is sewn with the base fabric 36 turned upside down, and after the sewing is completed, the base fabric 36 is turned over. FIG.
In the state of. With this sewing structure, the sewing thread 39 is hidden inside the base cloth 36 and becomes invisible, so that not only the appearance but also the feel is improved.

Next, a fifth embodiment of the present invention will be described with reference to FIG.

The fifth embodiment is an improvement of the fourth embodiment,
The urethane film 40 is interposed between the base cloth 36 and the cushion material 35 of the cover 28. Since the film 40 does not easily allow moisture to pass through, the shoulder belt 6 can be prevented from deteriorating by preventing the occupant's sweat and the like from penetrating the base material 36 and permeating the cushion material 35.

Although the embodiments of the present invention have been described in detail, various design changes can be made in the present invention without departing from the gist thereof.

For example, the cushion material 35 of the cover 28 is not always necessary, and can be omitted depending on the material of the base cloths 29, 30, and 36. Further, the structure of the sewing portion 38 of the fourth embodiment (see FIG. 10) can be applied to the first and second embodiments.

[0039]

As described above, according to the first aspect of the present invention, since the surface of the webbing of the air belt device is covered with the cover, the touch of the webbing in contact with the occupant is improved, and the air belt device is mounted. In this case, the occupant's uncomfortable feeling can be reduced, and the webbing can be protected from damage. Of the first and second sewn portions along both edges of the base fabric of the cover, the first sewn portion on the side facing the neck of the occupant is provided.
Since the sewing strength of the second sewing part on the side not facing the neck of the occupant is set lower than the sewing strength of the sewing part, the second sewing part is broken when the airbag and the webbing inflate due to the collision of the vehicle. Thus, it is possible to prevent the webbing from directly contacting the occupant's neck.

According to the second aspect of the present invention,
Since the sewing thread of the second sewing section is made thinner than the sewing thread of the first sewing section, the sewing strength of the second sewing section is reduced, and the second sewing section can be reliably broken.

According to the third aspect of the present invention,
Since the sewing pitch of the second sewing portion is made coarser than the sewing pitch of the first sewing portion, the sewing strength of the second sewing portion can be reduced and the second sewing portion can be reliably broken.

According to the fourth aspect of the present invention,
Since the surface of the webbing of the air belt device is covered with a cover, the feel of the webbing that contacts the occupant is improved,
The occupant's uncomfortable feeling when wearing the air belt device can be reduced, and the webbing can be protected from damage. Since the sewn portion of the base cloth of the cover folded in two at the fold line is arranged on the side not facing the occupant's neck, when the airbag and the webbing inflate due to the collision of the vehicle, the sewn portion between the occupant's neck and the webbing. The base fabric can be reliably interposed to prevent the webbing from directly contacting the occupant's neck.

According to the fifth aspect of the present invention,
Since the cushion material is laminated on the inner surface of the cover, not only the touch of the cover is further improved, but also the shock absorption of the cover can be improved.

[Brief description of the drawings]

FIG. 1 is a side view of a front seat portion of a vehicle.

FIG. 2 is a view in the direction of arrows in FIG. 1;

FIG. 3 is a perspective view of an air belt device.

FIG. 4 is an enlarged sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a view in the direction of arrows in FIG. 3;

FIG. 6 is a sectional view taken along line 6-6 in FIG. 5;

FIG. 7 is a cross-sectional view of an expanded shoulder belt.

FIG. 8 is a view corresponding to FIG. 5 according to a second embodiment of the present invention.

FIG. 9 is a view corresponding to FIG. 6 according to a third embodiment of the present invention.

FIG. 10 is a view corresponding to FIG. 6 according to a fourth embodiment of the present invention.

FIG. 11 is a view corresponding to FIG. 6 according to a fifth embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 seat 6 shoulder belt 11 inflator 12 bag 13 webbing 28 cover 29 inner base fabric 30 outer base fabric 31 first sewing portion 32 second sewing portion 33 sewing thread 34 sewing thread 35 cushion material 36 base fabric 37 folding line 38 sewing portion

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Osamu Kyogoku 1-4-1 Chuo, Wako-shi, Saitama Prefecture Inside Honda R & D Co., Ltd. (72) Yoshihiko Kinoshita 1-4-1-1 Chuo, Wako-shi, Saitama Inside Honda R & D Co., Ltd. (72) Inventor Hiroshi Akabane 1-4-1, Chuo, Wako-shi, Saitama Prefecture Inside Honda R & D Co., Ltd. (72) Tomoyuki Uemura 1-4-1, Chuo, Wako-shi, Saitama F-term in Honda R & D Co., Ltd. (reference) 3D054 AA02 AA07 AA25 BB30 CC30 CC36 CC41 EE14 EE25 FF02 FF20

Claims (5)

[Claims] A shoulder belt (6) for restraining an occupant to a seat (1) collides with an inflatable bag (12) with gas generated by an inflator (11) and covers an outer surface of the bag (12). An air belt device comprising: a webbing (13) for supporting a load generated by the airbag; and a cover (28) that covers an outer surface of the webbing (13) and breaks when the bag (12) is inflated, wherein the cover (28) is An inner base fabric (29) and an outer base fabric (30) covering both sides of the webbing (13), respectively,
First and second sewn portions (31, 32) along their both edges
And sewn into a tubular shape, the first side of the side facing the occupant's neck
An air belt device wherein the sewing strength of the second sewing portion (32) on the side not facing the occupant's neck is set lower than the sewing strength of the sewing portion (31). 2. The air belt device according to claim 1, wherein the sewing thread (34) of the second sewing section (32) is made thinner than the sewing thread (33) of the first sewing section (31). . 3. The air belt device according to claim 1, wherein a sewing pitch of the second sewing portion is made larger than a sewing pitch of the first sewing portion. 4. A shoulder belt (6) for restraining an occupant to a seat (1) collides with a bag (12) inflatable with gas generated by an inflator (11) over an outer surface of the bag (12). An air belt device comprising: a webbing (13) for supporting a load generated by the airbag; and a cover (28) that covers an outer surface of the webbing (13) and breaks when the bag (12) is inflated, wherein the cover (28) is The both sides of the webbing (13) are covered with a base fabric (36) folded in half at a fold line (37), and both end edges of the base fabric (36) are sewn into a tubular shape at a sewing portion (38). An air belt device, wherein the fold line (37) is arranged on a side facing the occupant's neck, and the sewn portion (38) is arranged on a side not facing the occupant's neck. 5. The cover according to claim 1, wherein a cushion material is laminated on an inner surface of the cover.
5. The air belt device according to any one of 4.