JP3757656B2 - Warp knitting for air belt cover, air belt cover and air belt device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bag of an air belt apparatus in which a part of a seat belt is a bag-like belt and the bag-like belt is inflated by gas from a gas generator in order to protect a vehicle occupant in a vehicle collision or the like. The present invention relates to a warp knitted fabric for an air belt cover for covering a belt. The present invention also relates to an air belt cover and an air belt device using the warp knitted fabric for the air belt cover.
[0002]
[Prior art and prior art]
As this type of inflatable belt device, the present applicant has firstly provided an inflatable inflatable belt and a gas generator for inflating by supplying gas into the inflatable belt, and the inflatable belt is formed in a belt shape. In an inflatable belt device comprising a folded bag-shaped belt and a cover surrounding the bag-shaped belt, the cover hardly extends in the longitudinal direction of the air belt, extends in the inflating direction of the air belt, and An air belt device has been proposed in which the length in the longitudinal direction of the air belt is reduced by extending in the air belt expansion direction (Japanese Patent Application No. 9-236903, hereinafter referred to as “prior application”).
[0003]
The prior art air belt apparatus will be described below with reference to the drawings. FIG. 1 (a) is a perspective view of the interior of a vehicle provided with the prior-art air belt device, and FIG. 1 (b) is a perspective view showing the air belt device. 2 (a) is a plan view of the vicinity of the connecting portion between the shoulder belt and the lap belt, FIG. 2 (b) is a plan view of the bag-like belt, and FIGS. 2 (c), (d) and (e) are It is sectional drawing which follows the CC line, DD line, and EE line of Fig.2 (a), respectively. 3 (a) is a plan view of the shoulder belt in an inflated state, FIG. 3 (b) is a plan view of the inflated bag-like belt, and FIGS. 3 (c) and 3 (d) are third views. It is sectional drawing which follows the CC line and DD line of figure (a). FIG. 4 is an explanatory view of a method of knitting the cover of the air belt.
[0004]
The air belt device 1 includes a shoulder belt 2 that extends obliquely from the right side to the left side of the occupant, a lap belt 3 that extends from the right side to the left side of the occupant, and a buckle device 4 that is disposed on a vehicle body floor. And a tongue 5 inserted and locked to the buckle device 4 when the belt is mounted, and an intermediate guide 6 for guiding the shoulder belt 2.
[0005]
The shoulder belt 2 includes a webbing 2A formed of a normal belt similar to a conventional general seat belt, and an air belt 2B connected to one end of the webbing 2A. The webbing 2A is slidably guided through the intermediate guide 6. The other end of the webbing 2A is connected to a seat belt retractor (ELR) 7 with an emergency locking mechanism fixed to the vehicle body. The webbing 2A can be wound around the seat belt retractor 7.
[0006]
The air belt 2 </ b> B is positioned at a portion where the occupant abuts, and the end opposite to the connection end with the webbing 2 </ b> A is connected to the tongue 5.
[0007]
The lap belt 3 is formed of a normal belt similar to a general seat belt, one end of which is connected to the tongue 5 and the other end is connected to a seat belt retractor (ELR) 8 fixed to the vehicle body. Yes. Further, the buckle device 4 is connected to a gas generator 9 that is activated in the event of an emergency such as a vehicle collision and generates high-pressure gas.
[0008]
The tongue 5 and the buckle device 4 are provided with a passage for guiding the gas from the gas generator 9 to the air belt 2B.
[0009]
As shown in FIGS. 2 and 3, the air belt 2 </ b> B includes a bag-like belt 10 and a cylindrical knit cover 12 surrounding the bag-like belt 10. The bag-shaped belt 10 has a shape in which a portion from the chest of an occupant sitting on the seat to the abdomen is widened, and as shown in FIG. 2, the widened portion is folded into a long band shape. Reference numeral 11 denotes a seam of the bag-like belt 10.
[0010]
The knit cover 12 is configured to flexibly expand and contract in the width direction but hardly extend in the longitudinal direction. FIGS. 4 (a) and 4 (b) show how to knit the knit cover.
[0011]
FIG. 4 (a) shows a normal warp knitting made of the knitting yarn 20, and a plurality of knitting yarns 20 (20A to 20D) form a loop R. FIG. The loops R are alternately arranged on the left and right sides from the top to the bottom of the figure. The leading end side of each loop R (for example, the leading end side of the loop R _B2 ) is wound around the root portion (for example, the root portion of the loop R _A1 ) of the adjacent knitting yarn loop, and the proximal end side is the leading end of the adjacent knitting yarn loop. side (e.g., front end side of the loop _{R A3)} is wound. Accordingly, the loop R is continuously arranged in the vertical direction in the figure, and the left knitting yarn loop and the right knitting yarn loop are alternately arranged in the vertical direction. That is, the loops R _A1 , R _B2 , and R _A3 are arranged in this order from the top.
[0012]
FIG. 4B shows that the insertion thread 30 is inserted into the knitting thread 20 to increase the strength and reduce the thickness. The insertion yarns 30 are knitted so as to alternately pass through the intersections of the knitting yarns 20 along the row of loops continuous in the vertical direction from the front side to the back side and from the back side to the front side of the knitting. As shown in the figure, the insertion yarn 30 is entangled in one column of knitting.
[0013]
The air belt 2B and the lap belt 3 are joined to the tongue. The knit cover 12 is joined to both the webbing 2A and the tongue 5, and is configured to bear a tensile load applied to the air belt.
[0014]
When the gas generator 9 is activated with the tongue 5 attached to the buckle device 4, the air belt 2B expands. At this time, the length of the knit cover 12 in the longitudinal direction of the air belt 2B is shortened, the air belt 2B comes into close contact with the occupant, and the occupant can be protected extremely reliably.
[0015]
FIG. 5 shows a situation in which the longitudinal length of the knit cover 12 made of warp knitting using the insertion thread 30 shown in FIG. 4 (b) becomes short when the air belt 2B (bag-like belt 10) is inflated. Is shown. As described above, the knit cover 12 is hardly stretched in the longitudinal direction of the belt due to the heat stretching process. When the bag-shaped belt 10 swells, the stitches of the knit cover 12 spread in the lateral direction, and as a result, the knit cover 12 contracts in the longitudinal direction, and the length of the air belt 2B in the longitudinal direction becomes shorter.
[0016]
In such an air belt device, when the gas generator is activated and the air belt is expanded, the cover is also expanded. Since this cover hardly extends in the longitudinal direction of the air belt, the length is shortened when the air belt is expanded. As described above, as a result of the shortening of the length of the air belt, the air belt strongly fits the occupant. For this reason, a passenger | crew can be protected reliably.
[0017]
[Problems to be solved by the invention]
It is an object of the present invention to increase the resistance of a warp knitted run (wire) for an air belt cover having the insertion yarn as described above. Another object of the present invention is to provide an air belt cover made of a warp knitted fabric for the air belt cover and an air belt device provided with the air belt cover.
[0018]
[Means for Solving the Problems]
A warp knitted fabric for an air belt cover according to the present invention is a warp knitted fabric for an air belt cover for covering a bag-shaped belt folded to form a belt, which constitutes an inflatable air belt. A warp knitted fabric for an air belt cover provided with an insertion yarn inserted into a knitting yarn, wherein the insertion yarn is entangled in three or more rows with respect to a knitting longitudinal column.
[0019]
In the warp knitted fabric for the air belt cover of the present invention, the resistance to the run is remarkably improved by entangled the insertion yarn with three or more knitting columns.
The air belt cover of the present invention is made of the warp knitted fabric for the air belt cover of the present invention. The inflatable belt device of the present invention comprises this inflatable belt cover.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
The embodiment of the present invention will be described below with reference to FIGS.
[0021]
The warp knitted fabric for the air belt cover of the present invention is obtained by inserting an insertion yarn 30 into a normal warp knitting yarn 20, and each of the insertion yarns 30 is continuous in the vertical direction with respect to the basic knitted fabric. It is woven so as to be entangled in three columns of loops.
[0022]
In FIG. 6, the chain stitches in the column are not continuous in the column direction. That is, the knitting yarn immediately shifts to the adjacent column as soon as one chain knitting (loop) is formed, forms one chain knitting (loop) in that column, and then returns to the original column, and this is repeated. Yes.
[0023]
In the knitting structure of FIG. 6, the insertion yarn is entangled in three columns. For example, in three columns of left, middle, and right, the insertion thread is entangled in three columns in the order of left → middle → right → middle → left middle → right → middle (hereinafter repeated).
[0024]
Thus, the run is prevented by entwining the insertion yarns in three columns. FIG. 7 is a schematic diagram showing a run occurrence state in a comparative example having no insertion thread. (A) When the thread breakage occurs as shown in the figure and the loop entanglement disappears at one place, the loops come off one after another as shown in FIGS. By providing the insertion thread, the expansion of the tear is prevented, but when the insertion thread is entangled in three or more columns, the expansion of the tear is surely prevented.
[0025]
In the present invention, it is preferable that the insertion yarn 30 is entangled in 3 to 6 columns.
[0026]
In the present invention, the knitting yarn and the insertion yarn (hereinafter collectively referred to as “component yarns”) are made of thermoplastic synthetic filament yarn such as polyamide or polyester yarn, and the raw yarn strength is 8.0 g / d. The above is preferable.
[0027]
In the present invention, the constituent yarn is preferably composed of a thin filament of 5 to 10d, and particularly preferably, the insertion yarn is a 1000 to 3000d yarn composed of 100 to 300 filaments of 5 to 10d. Using two yarns that are aligned to 3000 d or less, the knitting yarn is a yarn of 250 to 1500 d consisting of 30 to 300 filaments of 5 to 10 d and smaller than the denier number of the insertion yarn. It is preferable to use it.
[0028]
Moreover, it is preferable that the warp knitted fabric for an air belt cover of the present invention performs elongation setting and width adjustment by performing heat stretching processing by heat setting.
[0029]
In the present invention, it is preferable to determine the number of inserted yarns from the required tensile strength characteristics.
[0030]
The warp knitted fabric for an air belt cover of the present invention is preferably 1.0 to 2.0 mm in thickness, and has a tension generated in the length direction (coating) due to elongation in the lateral direction (wel) at 100 kPa. (Hereinafter, this tension is referred to as “length regulation tension”.) Is manufactured to be 200 to 600 kgf.
[0031]
【The invention's effect】
As described above, according to the present invention, a warp knitted fabric for an air belt cover having excellent run resistance as a knit cover of an air belt device, an air belt cover made of a warp knitted fabric for the air belt cover, and the air belt cover An inflatable belt device is provided.
[Brief description of the drawings]
FIG. 1 is a perspective view of a seat provided with an air belt device according to a prior application, and a perspective view of the air belt device.
FIG. 2 is a configuration diagram of an air belt.
FIG. 3 is a configuration diagram when the air belt is inflated.
FIG. 4 is an explanatory diagram of how to knit a knit cover.
FIG. 5 is an explanatory view showing a comparison between a normal state of an air belt and a state during expansion.
FIG. 6 is a configuration diagram (knitting structure diagram) of a warp knitted fabric for an air belt cover according to an embodiment.
FIG. 7 is an explanatory diagram of a run occurrence state.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Air belt apparatus 2 Shoulder belt 2A Webbing 2B Air belt 3 Lap belt 4 Buckle apparatus 5 Tongue 6 Intermediate guide 7,8 Seat belt retractor 9 Gas generator 10 Bag-shaped belt 12 Knit cover 20 Knitting thread 30 Insertion thread

Claims (4)

A warp knitted fabric for an air belt cover for covering a bag-shaped belt folded to form an inflatable air belt, comprising a knitting yarn and an insertion yarn inserted into the knitting yarn In warp knitting for air belt cover,
A warp knitted fabric for an air belt cover, wherein the insertion yarn is entangled in three or more rows with respect to a knitting vertical row. The warp knitted fabric for an air belt cover according to claim 1, wherein the insertion yarn is entangled in 3 to 6 rows with respect to a knitting longitudinal row. An air belt cover made of a warp knitted fabric for an air belt cover according to claim 1 or 2 . An air belt apparatus comprising the air belt cover according to claim 3 .

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