JP6434738B2 - Seat belt and seat belt device - Google Patents

Description

  The present invention relates to a seat belt and a seat belt device.

  Conventionally, a seat belt provided with an inflating structure is known (see, for example, Patent Document 1). The seat belt disclosed in Patent Document 1 includes a hose-like gas pipe as a gas passage for expanding the seat belt.

International Publication No. 99/039940 Pamphlet

  However, in the above-described conventional technology, the seat belt is inflated by the gas supplied from the hose-like gas pipe arranged inside the seat belt, so that the structure for inflating the seat belt is complicated.

  Therefore, an object is to provide a seat belt and a seat belt device having a simple inflating structure.

One idea is that
A hollow film made of rubber or resin, and a cylindrical knitted fabric that wraps the film,
The knitted fabric has a shoulder belt portion that expands as the film expands in a cylindrical shape by the gas supplied to the hollow portion of the film,
The outer peripheral surface of the film and the inner peripheral surface of the knitted fabric are combined so that the film and the knitted fabric are integrated ,
The shoulder belt portion is provided with a seat belt that expands while the outer peripheral surface and the inner peripheral surface are coupled .
Also, one idea is
A hollow film made of rubber or resin, and a cylindrical knitted fabric that wraps the film,
The knitted fabric has a shoulder belt portion that expands as the film expands in a cylindrical shape by the gas supplied to the hollow portion of the film,
The outer peripheral surface of the film and the inner peripheral surface of the knitted fabric are combined so that the film and the knitted fabric are integrated,
The course density of the middle part of the shoulder belt part is lower than the course density of the end part of the shoulder belt part,
The knitted fabric is provided with a seat belt having a lap belt portion provided with a portion having a higher course density than the intermediate portion.
Also, one idea is
A hollow film made of rubber or resin, and a cylindrical knitted fabric that wraps the film,
The knitted fabric has a shoulder belt portion that expands as the film expands in a cylindrical shape by the gas supplied to the hollow portion of the film,
The outer peripheral surface of the film and the inner peripheral surface of the knitted fabric are combined so that the film and the knitted fabric are integrated,
A seat belt is provided in which inner peripheral surfaces of the film are bonded to each other so as to be peelable when the film is expanded.

  According to one aspect, since the film itself that functions as a gas passage expands in a cylindrical shape, the expansion structure of the seat belt can be simplified.

It is a perspective view showing an example of a seat belt device provided with a seat belt. It is a perspective view which shows an example of a seat belt partially. It is a top view which shows an example of a knitted fabric partially. It is a top view which shows an example of a seatbelt. Sectional drawing which shows an example of the normal state of the film before expansion | swelling Sectional drawing which shows an example of the expansion | swelling state of the film after expansion | swelling

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration diagram of a seat belt device 10 according to an embodiment of the present invention. FIG. 1 shows an example of a state in which the seat belt device 10 is mounted on a vehicle. The seat belt device 10 includes an air belt 11, a shoulder anchor 14, a retractor 12, a tongue 15, a buckle 17, and an inflator 50.

  The air belt 11 is an example of a seat belt that restrains an occupant sitting on the seat 18, and includes, for example, one end portion 13 connected to the retractor 12 and the other end portion 16 connected to the floor portion 24 of the passenger compartment. It is a strip-shaped member which has. In the illustrated case, the end portion 16 is connected to an inflator 50 fixed to the floor portion 24.

  The shoulder anchor 14 is a belt insertion member that is installed at a portion of the seat 18 on the outer side in the vehicle width direction. A portion between the end portion 13 and the end portion 16 of the air belt 11 is passed through the shoulder anchor 14.

  The retractor 12 is an example of a winding device that enables the air belt 11 to be wound or pulled out. For example, when an acceleration of a predetermined value or more is detected during a vehicle collision or the like, the air belt 11 is removed from the main body of the retractor 12. Limit being pulled out. The retractor 12 is fixed to a vehicle body part on the side of the backrest 19 of the seat 18 (for example, a lower part of the pillar portion to which the shoulder anchor 14 is fixed).

  The tongue 15 is a plate-like member that is slidably attached to the air belt 11 between the floor portion 24 and the shoulder anchor 14 (in the illustrated case, between the inflator 50 and the shoulder anchor 14).

  The buckle 17 is a member to which the tongue 15 is attached and detached. The buckle 17 is fixed to a vehicle body part opposite to the retractor 12 with respect to the seat part 20 of the seat 18.

  By connecting the tongue 15 to the buckle 17, the chest of the passenger on the seat 18 is restrained by the shoulder belt portion 21 of the air belt 11, and the waist of the passenger is restrained by the lap belt portion 22 of the air belt 11. The shoulder belt portion 21 is a portion of the air belt 11 between the shoulder anchor 14 and the tongue 15 in a state where the tongue 15 is coupled to the buckle 17. The lap belt portion 22 is a portion of the air belt 11 between the tongue 15 and the floor portion 24 (in the illustrated case, between the tongue 15 and the inflator 50) in a state where the tongue 15 is coupled to the buckle 17.

  The air belt 11 has a wound belt portion 23 that is wound around the retractor 12. The wound belt portion 23 is a portion of the air belt 11 between the shoulder anchor 14 and the retractor 12 in a state where the tongue 15 is connected to the buckle 17. A part or all of the shoulder belt portion 21 may be wound around the retractor 12.

  The inflator 50 is an example of a gas supply device (gas generator) that supplies a gas that inflates an inflatable portion of the air belt 11. For example, when an acceleration of a predetermined value or more is detected during a vehicle collision or the like, Gas is supplied to the expansion part. For example, the shoulder belt portion 21 is an inflating portion that expands in a spindle shape as shown by a dotted line by gas supplied from the inflator 50 via the lap belt portion 22.

  FIG. 2 is a perspective view showing a part of the air belt 11. FIG. 2 shows a cross section of the inflating portion of the air belt 11. The air belt 11 includes a film 40 and a mesh webbing 30.

  The film 40 is an example of a hollow film made of rubber or resin. The film 40 is an elastic member formed from a rubber material such as an elastomer film. The elastomer film is, for example, a sheet-like member such as polyurethane, polyester, or polyamide. The film 40 may be an elastic member formed of a resin material such as a polyethylene film. The hollow film 40 may or may not have a seam.

  The term “made of rubber or resin” means that the main component is rubber or resin, and does not mean that the material is made of only rubber or resin.

  The film 40 is a hermetic material having a hollow portion 43 extending in the longitudinal direction of the film 40 and expanding in a cylindrical shape by the pressure of gas supplied from the inflator 50 to the hollow portion 43. The shape of the film 40 before expansion is a hollow strip shape. The film 40 expands in the width direction and the thickness direction of the film 40 so that the circumferential length of an arbitrary cross section of the film 40 becomes longer.

  The inflator 50 is connected to the opening end of the hollow portion 43, and the gas ejected from the inflator 50 flows into the hollow portion 43 from the opening end. The end of the hollow portion 43 opposite to the open end is closed at an appropriate position in the longitudinal direction in the mesh webbing 30. The closed end opposite to the open end of the hollow portion 43 is located at the end of the shoulder belt portion 21 on the shoulder anchor 14 side in a state where the tongue 15 is connected to the buckle 17 in FIG. You may be located in the winding belt part 23. FIG.

  2, the mesh webbing 30 is an example of a cylindrical knitted fabric that wraps the outer peripheral surface 41 of the film 40. For example, the mesh webbing 30 is knitted into a cylindrical shape with a knitting yarn 36 (see FIG. 3, details will be described later) such as a polyester yarn. It is a made thing. The mesh webbing 30 has a portion that expands as the film 40 expands in a cylindrical shape by the gas supplied to the hollow portion 43.

  Thus, since the air belt 11 has a simple expansion structure in which the film 40 itself functioning as a gas passage expands in a cylindrical shape, for example, the weight and cost of the air belt 11 can be reduced. In particular, since relatively lightweight parts such as a film and a knitted fabric are used, the effect of reducing the weight of the air belt 11 is extremely high. By reducing the weight of the air belt 11, for example, it is possible to significantly reduce the winding force or pull-out force required for the retractor 12, and to reduce labor when the occupant operates the air belt 11 in a normal state. it can.

  The film 40 is a highly stretched member having an elongation of 200% or more (preferably 500% or more), for example. When the elongation of the film 40 is 200% or more (preferably 500% or more), the region where the air belt 11 receives the occupant extends to an appropriate area, so that the elongation of the film 40 is less than 200%. The passenger restraint performance is particularly improved. The upper limit value of the elongation of the film 40 is determined according to, for example, the positional relationship between the air belt 11 and the occupant's head at the time of maximum expansion.

In the film tensile test, when the initial length of the film is Lo and the length when the film is broken is L,
Elongation = (L−Lo) / Lo × 100 (%)
It is represented by

  The thickness of the film 40 is, for example, 0.05 mm or more and 1 mm or less (more preferably, 0.1 mm or more and 0.9 mm or less). If the thickness of the film 40 is less than 0.05 mm, for example, the strength of the film 40 is too low. When the thickness of the film 40 exceeds 1 mm, for example, the flexibility of the air belt 11 decreases.

  The film 40 has, for example, an outer peripheral surface 41 that is coupled to the inner peripheral surface 32 of the mesh webbing 30. By combining the inner peripheral surface 32 and the outer peripheral surface 41 so that the film 40 and the mesh webbing 30 are integrated, the expansion structure of the air belt 11 can be simplified. Further, the inner peripheral surface 32 and the outer peripheral surface 41 are joined so that the film 40 and the mesh webbing 30 are integrated, so that even if the occupant or the retractor 12 pulls the air belt 11, the film 40 remains in the mesh webbing 30. Shifting can be suppressed. In addition, since the inner peripheral surface 32 and the outer peripheral surface 41 are combined so that the film 40 and the mesh webbing 30 are integrated, the film 40 is not easily displaced in the mesh webbing 30 even if the occupant touches the air belt 11. The operability of the passenger and the merchantability of the air belt 11 are improved.

  For example, the surface of the outer peripheral surface 41 and the surface of the inner peripheral surface 32 are bonded by the adhesive 60 so that the film 40 and the mesh webbing 30 are integrated, thereby easily simplifying the expansion structure of the air belt 11. Can do. The adhesive 60 may be an adhesive member such as an adhesive film.

  For example, when the melting point of the adhesive 60 is lower than the melting point of the film 40, the outer peripheral surface 41 is welded by heating the adhesive 60 at a temperature higher than the melting point of the adhesive 60 and lower than the melting point of the film 40. And the inner peripheral surface 32 can be combined. By combining the outer peripheral surface 41 and the inner peripheral surface 32 in this manner, it is possible to suppress air bubbles from being mixed into the film 40 due to melting of the film 40.

  A specific example of the adhesive 60 is a thermoplastic resin. For example, the outer peripheral surface 41 is joined to the inner peripheral surface 32 by welding of a thermoplastic resin impregnated in the inner peripheral surface 32 (for example, hot melt of the same material as the film 40).

  In addition, when the outer peripheral surface 41 and the inner peripheral surface 32 are joined, even if the knitting yarn 36 or the weft yarn 37 (see FIG. 3, details will be described later) of the mesh webbing 30 is temporarily cut, the knitting yarn joined to the film 40. The unwinding of 36 or the weft 37 can be suppressed. Further, since the knitting yarn 36 or the weft 37 is coupled to the outer peripheral surface 41, even if a hole is formed in the film 40, the expansion of the hole can be suppressed in the stitch of the mesh webbing 30.

  In FIG. 2, the opposing inner peripheral surfaces 42 of the film 40 may be coupled so as to be peelable by the gas pressure in the hollow portion 43 when the film 40 is expanded (in FIG. 2, the opposing inner peripheral surfaces 42). Although they are separated from each other, they are in contact with each other before the film 40 is expanded). By combining and integrating the inner peripheral surfaces 42, it is difficult to shift the film 40 in the mesh webbing 30, and the operability of the occupant and the merchantability of the air belt 11 are particularly improved. Examples of a method for joining the inner peripheral surfaces 42 include adhesion, welding, and pressure bonding.

  FIG. 3 is a plan view schematically showing a part of the mesh webbing 30, and schematically shows an example of weft knitting of the mesh webbing 30. Specific examples of weft knitting include flat knitting, rubber knitting, and pearl knitting. The wale W is a stitch arranged continuously in the longitudinal direction of the mesh webbing 30, and the course C is a stitch arranged continuously in the width direction of the mesh webbing 30.

  When gas is supplied from the inflator 50 to the hollow portion 43 in a state where the tongue 15 is connected to the buckle 17, the stitches of the mesh webbing 30 pressed by the expanding film 40 spread in the width direction. The mesh webbing 30 is flexibly expanded and contracted in the width direction of the mesh webbing 30, but is produced so as to hardly extend by being heated and stretched in the longitudinal direction of the mesh webbing 30. The length in the longitudinal direction is shortened. Therefore, the air belt 11 is in close contact with the occupant, and the occupant can be protected extremely reliably.

  The width direction of the mesh webbing 30 substantially coincides with the width direction of the air belt 11 or the film 40, and the longitudinal direction of the mesh webbing 30 substantially coincides with the longitudinal direction of the air belt 11 or the film 40.

  For example, as shown in FIG. 3, the mesh webbing 30 has a stitch (loop) in which a weft yarn 37 is inserted. The wefts 37 different from the knitting yarns 36 of the course C are inserted into the stitches at appropriate intervals, whereby the rigidity in the width direction of the mesh webbing 30 is increased. As a result, the amount of expansion in the width direction of the mesh webbing 30 can be suppressed, and the rigidity of the air belt 11 can be increased. When the rigidity of the air belt 11 is increased moderately, for example, a firm feeling can be given to the occupant, and the exterior cover that wraps the mesh webbing 30 can be eliminated.

  FIG. 4 is a plan view showing the air belt 11. The air belt 11 has one end 13 connected to the retractor 12 and the other end 16 connected to the inflator 50.

  The mesh webbing 30 is, for example, one tubular knitted fabric from the end 16 to the end 13. One hollow film 40 (see FIG. 2) extends inside the mesh webbing 30 from the end 16 to a suitable position in the longitudinal direction of the mesh webbing 30. For example, the open end of the hollow portion 43 of the film 40 is located at the end portion 16, and the closed end opposite to the open end of the hollow portion 43 is located at the end portion of the shoulder belt portion 21 on the shoulder anchor 14 side. .

  The closed end of the hollow portion 43 may be positioned on the wound belt portion 23. In this case, for example, the strength of the weft 37 inserted into the wound belt part 23 or the course density of the wound belt part 23 is made higher than that of the shoulder belt part 21 so that the wound belt part 23 does not expand. .

  The mesh webbing 30 includes a shoulder belt portion 21, a lap belt portion 22 positioned on the end portion 16 side with respect to the shoulder belt portion 21, and a wound belt portion positioned on the end portion 13 side with respect to the shoulder belt portion 21. 23.

  The shoulder belt portion 21 is a portion that expands as the film 40 expands in a cylindrical shape. Since the intermediate portion 33 of the shoulder belt portion 21 is formed with a course density lower than that of the one end portion 34 and the other end portion 35 of the shoulder belt portion 21, the intermediate portion 33 includes the end portions 34, Swells greater than 35. Therefore, even if the position of the occupant's chest varies depending on the occupant's physique, the occupant's chest can be reliably received by the intermediate portion 33.

  A part or all of the lap belt portion 22 is formed with a course density higher than that of the intermediate portion 33, for example. Thereby, the lap belt part 22 can be expanded smaller than the shoulder belt part 21, or the lap belt part 22 can be not expanded. For example, the lap belt portion 22 is formed with a higher course density than the end portion 34 or the end portion 35 of the shoulder belt portion 21. By making the course density of the lap belt portion 22 relatively high, movement of the occupant's waist can be reliably suppressed by the lap belt portion 22.

  For example, part or all of the wound belt portion 23 is formed with a higher course density than the shoulder belt portion 21 and the lap belt portion 22. Thereby, the rigidity of the to-be-winded belt part 23 can be raised, and the retractor 12 can wind up the to-be-winded belt part 23 smoothly.

  The rigidity of the shoulder belt portion 21, the lap belt portion 22, and the wound belt portion 23 can be increased by adding the weft 37 shown in FIG. For example, the weft 37 inserted into the wound belt portion 23 has a strength higher than that of the weft 37 inserted into the shoulder belt portion 21, so that the rigidity of the wound belt portion 23 is increased. It can be made higher than the rigidity. The strength of the weft 37 is increased, for example, by increasing the density of the weft 37 by adjusting the number, thickness, or pitch of the wefts 37 to be inserted.

  FIG. 5 is a cross-sectional view showing an example of a normal state of the film 40 before expansion. The knitting yarn 36 on the inner peripheral surface 32 of the mesh webbing 30 is joined to the outer peripheral surface 41 of the film 40 by an adhesive 60 such as an adhesive film. FIG. 6 is a cross-sectional view showing an example of the expanded state of the film 40 after expansion. The mesh webbing 30 has a shoulder belt portion 21 that expands in a spindle shape as the film 40 expands into a cylindrical shape by the gas supplied to the hollow portion 43. The surface area of the elastic film 40 is expanded by the gas supplied to the hollow portion 43 so that the size of the stitch (for example, the interval between the adjacent knitting yarns 36) increases.

  As the elastic film 40 almost returns to the original shape of the flat band due to the escape of gas in the hollow portion 43, the air belt 11 also returns to the original shape of the flat band. Accordingly, for example, the passenger can be temporarily restrained by the air belt 11 that has been deflated after inflation until the vehicle arrives at the repair shop.

  As shown in FIG. 6, the shoulder belt portion 21 expands while the outer peripheral surface 41 of the film 40 and the knitting yarn 36 on the inner peripheral surface 32 of the mesh webbing 30 are bonded together by the adhesive 60. Thereby, even if a part of the knitting yarn 36 is cut by the expansion of the film 40, the knitting yarn 36 is bonded to the outer peripheral surface 41, so that the knitting yarn 36 can be prevented from being unwound. Even if the expanded film 40 has a hole, the expansion of the hole can be suppressed inside each stitch of the mesh webbing 30.

  The seat belt and the seat belt device have been described above by way of the embodiment, but the present invention is not limited to the above embodiment. Various modifications and improvements such as combinations and substitutions with some or all of the other embodiments are possible within the scope of the present invention.

  For example, the shoulder belt portion 21 and the lap belt portion 22 may be formed of separate knitted fabrics. In this case, the inflator installed on the buckle 17 supplies a gas for expanding the film 40 wrapped in the shoulder belt portion 21, and the retractor 12 winds up the belt portion 23 to be wound. When the lap belt portion 22 is inflated, the inflator disposed on the end portion 16 or the buckle 17 side supplies gas for inflating the film 40 wrapped in the lap belt portion 22 and is installed on the buckle 17 side or the end portion 16 side. The retracted retractor (a retractor different from the retractor 12) winds the lap belt portion 22.

  For example, the air belt 11 may include an exterior cover that wraps the mesh webbing 30. Further, in order to increase the rigidity of the mesh webbing 30, a resin coating may be applied to the outer peripheral surface 31 of the mesh webbing 30.

DESCRIPTION OF SYMBOLS 10 Seatbelt apparatus 11 Airbelt 12 Retractor 14 Shoulder anchor 15 Tongue 17 Buckle 18 Seat 19 Back 20 Seat part 21 Shoulder belt part 22 Lap belt part 23 Winding belt part 24 Floor part 30 Mesh webbing 31 Outer peripheral surface 32 Inner peripheral surface 33 Intermediate portion 34, 35 End portion 36 Knitting yarn 37 Weft 40 Film 41 Outer peripheral surface 42 Inner peripheral surface 43 Hollow portion 50 Inflator 60 Adhesive

Claims (12)

A hollow film made of rubber or resin, and a cylindrical knitted fabric that wraps the film,
The knitted fabric has a shoulder belt portion that expands as the film expands in a cylindrical shape by the gas supplied to the hollow portion of the film,
The outer peripheral surface of the film and the inner peripheral surface of the knitted fabric are combined so that the film and the knitted fabric are integrated ,
The shoulder belt portion is a seat belt that expands while the outer peripheral surface and the inner peripheral surface are coupled . A hollow film made of rubber or resin, and a cylindrical knitted fabric that wraps the film,
The knitted fabric has a shoulder belt portion that expands as the film expands in a cylindrical shape by the gas supplied to the hollow portion of the film,
The outer peripheral surface of the film and the inner peripheral surface of the knitted fabric are combined so that the film and the knitted fabric are integrated ,
The course density of the middle part of the shoulder belt part is lower than the course density of the end part of the shoulder belt part,
The knitted fabric is a seat belt having a lap belt portion provided with a portion having a higher course density than the intermediate portion . A hollow film made of rubber or resin, and a cylindrical knitted fabric that wraps the film,
The knitted fabric has a shoulder belt portion that expands as the film expands in a cylindrical shape by the gas supplied to the hollow portion of the film,
The outer peripheral surface of the film and the inner peripheral surface of the knitted fabric are combined so that the film and the knitted fabric are integrated ,
The inner peripheral surface of the said film is a seatbelt couple | bonded so that peeling is possible at the time of the expansion | swelling of the said film . The seat belt according to claim 1 or 3 , wherein a course density of an intermediate portion of the shoulder belt portion is lower than a course density of an end portion of the shoulder belt portion. The seat belt according to claim 4 , wherein the knitted fabric has a lap belt portion provided with a portion having a higher course density than the intermediate portion. The seat belt according to claim 2 or 5 , wherein the lap belt portion has a portion having a higher course density than the end portion. The seat belt according to any one of claims 1 to 6, wherein the outer peripheral surface and the inner peripheral surface are bonded together by an adhesive. The melting point of the adhesive is lower than the melting point of the film,
The seat belt according to claim 7 , wherein the outer peripheral surface and the inner peripheral surface are bonded together by welding of the adhesive. The seat belt according to any one of claims 1 to 8 , wherein the film has an elongation of 200% or more. The seat belt according to any one of claims 1 to 9 , wherein the knitted fabric has a wound belt portion provided with a portion having a higher course density than the shoulder belt portion. The seat belt according to any one of claims 1 to 10 , wherein the knitted fabric has a stitch in which a weft is inserted. The seat belt according to any one of claims 1 to 11,
A gas supply for supplying a gas for expanding the film;
A retractor that winds up the seat belt;
A tongue attached to the seat belt;
A buckle to which the tongue is attached and detached;
A seat belt device comprising a shoulder anchor through which the seat belt is passed.

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