JP4453176B2 - Bench seat for vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle bench seat that enables a plurality of occupants to be seated and prevents the seated occupants from slipping when required.
[0002]
Here, the front slip is a phenomenon in which the lower body of the occupant moves forward when an impact or the like acts on the vehicle, and is usually called a submarine phenomenon.
[0003]
[Prior art and its problems]
Conventionally, there has been a vehicle seat disclosed in Japanese Patent Application Laid-Open No. 10-217818 for preventing a seated occupant from slipping forward when required.
[0004]
The vehicle seat includes a seat body and an airbag device built in the seat body. The airbag device is arranged near the front end of the seat body and inflates the airbag upward. When necessary, the front end of the seat cushion is raised to lift the back of the occupant's knee Therefore, it was the structure which prevents a passenger | crew's front slip.
[0005]
However, this conventional vehicle seat is a front seat and cannot deal with a bench seat on which a plurality of passengers can be seated.
[0006]
In view of the above, an object of the present invention is to provide a vehicle bench seat that can reliably prevent a front slip of each occupant that occurs when necessary even when a plurality of occupants are seated.
[0007]
[Means for Solving the Problems]
The vehicle bench seat according to the present invention is a vehicle bench seat capable of seating a plurality of occupants and capable of preventing front slip of each seated occupant when required,
The airbag device is stored in the lower part of the front end side of the seat portion of the bench seat,
The airbag device includes a bag-like airbag that is disposed over substantially the entire vehicle lateral direction of the seat portion, and an inflator that supplies inflation gas to the airbag .
The inflator is substantially at the center in the vehicle left-right direction of the airbag, and is disposed between the occupant seating portions on both sides in the vehicle left-right direction of the airbag,
In the airbag, a tether that connects the peripheral walls of the airbag and regulates the cross-sectional opening area when the airbag is inflated is disposed,
The tether is disposed along the vertical direction so as to connect the vicinity of the upper end and the vicinity of the lower end of the peripheral wall of the airbag when the inflation is completed, and is disposed at a position between the occupant seating portions in the seat portion. It is characterized by.
[0009]
Further, it is desirable that a rectifying member is provided in the airbag so as to cover the inflator and allow the inflation gas discharged from the inflator to flow out toward both ends of the airbag in the lateral direction of the vehicle. .
[0011]
[Operation and effect of the invention]
In the vehicle bench seat according to the present invention, when necessary, the inflation gas discharged from the inflator flows into the airbag and the airbag is inflated. The airbag is inflated toward the back of each occupant's knee and restrains the back of the thigh of each occupant who has moved forward by inertial force, thereby suppressing the forward movement of each occupant's buttocks , It is possible to prevent each passenger from slipping. Further, in the present invention, since a plurality of passengers seated with one airbag and one inflator can be protected, the occupied space of the airbag device can be reduced, and the airbag device can be reduced. It can be installed compactly.
[0012]
Therefore, in the vehicle bench seat of the present invention, even if a plurality of occupants are seated without making the airbag device bulky, it is possible to reliably prevent the front slip of each occupant that occurs when necessary.
[0013]
Further, in the vehicle bench seat of the present invention, the inflator, a substantially center in the vehicle left-right direction of the airbag, from the fact that is disposed between the occupant seated sites on both sides of the vehicle lateral direction of the airbag, the inflator each inflation gas discharged, Ki de be substantially uniformly supplied to the vehicle left-right direction of the airbag, and it is possible to uniformly inflate the site of the vehicle transverse direction both sides of the airbag, seated on the left and right sides Crew can be protected evenly. In the vehicle bench seat of the present invention, the vicinity of the center of the airbag is first inflated by the inflation gas discharged from the inflator. Therefore, when the vehicle bench seat of the present invention is applied to a bench seat for three persons, an occupant seated in the center can be quickly protected.
Furthermore, in the vehicle bench seat according to the present invention, the airbag is inflated because the airbag is connected to the peripheral wall of the airbag and a tether for restricting the sectional opening area when the airbag is inflated is disposed. The cross-sectional opening area at the time can be made uniform, and each part of the airbag in the vehicle left-right direction can be evenly inflated. Therefore, a plurality of seated passengers can be protected more stably.
[0014]
Furthermore, if the rectifying member that covers the inflator and allows the inflation gas discharged from the inflator to flow out toward the both ends of the airbag in the vehicle left-right direction is arranged in the airbag, A smooth outflow of the inflation gas to the vicinity of both ends of the bag in the left-right direction of the vehicle can be ensured, and the airbag can be inflated more evenly. Therefore, a plurality of seated passengers can be protected more stably.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0017]
A vehicle bench seat (hereinafter abbreviated as “bench seat”) 1 according to an embodiment of the present invention is shown in FIGS. In the present embodiment, a bench seat for three people will be described as an example of the bench seat 1.
[0018]
The bench seat 1 includes a backrest portion 2 and a seat portion 3, and the seat portion 3 is disposed below the seat cushion 5 and a support plate 8 (seat frame) that supports the seat cushion 5. ) And. And the seat part 3 is equipped with the passenger | crew seating site | part 3L * 3R of the both sides of the vehicle left-right direction, and the passenger | crew seating site | part 3C arrange | positioned between the passenger | crew seating site | part 3L * 3R in the approximate center of the seat part 3. Yes. The support plate 8 is disposed along a substantially horizontal direction, and an attachment hole 8a into which a bolt 23 disposed in an inflator 21 to be described later can be inserted is formed in the vicinity of the front end portion. The seat cushion 5 includes a cushion main body 6 made of polyurethane or the like, and a skin 7 arranged so as to cover the surface of the cushion main body 6. An airbag device 11 is housed between the cushion body 6 and the support plate 8 in the vicinity of the vehicle front side end.
[0019]
The airbag device 11 includes an airbag 13, an inflator 21 that supplies inflation gas to the airbag 13, a rectifying cloth (rectifying member) 18 that covers the outer periphery of the inflator 21 and is disposed in the airbag 13, And a tether 20 that is disposed in the airbag 13 and connects a peripheral wall 14 (to be described later) of the airbag 13 and restricts the sectional opening area when the airbag 13 is inflated. The inflator 21 is substantially in the center of the airbag 13 in the left-right direction of the vehicle, and can inflate inflation gas to the upper side of the bench seat 1 between the passenger seating portions 3L and 3R on both sides of the airbag 13 in the left-right direction of the vehicle. Has been placed. That is, in the embodiment, the inflator 21 is disposed below the occupant seating site 3C. As shown in FIG. 3, the airbag 13 is housed in a bellows-folded manner above the inflator 21 together with the rectifying cloth 18 and the tether 20, and allows the inflation gas from the inflator 21 to flow into the bench 13. It is set as the structure expand | swelled toward the sheet | seat 1 upper side. The outer periphery of the folded airbag 13 is covered with a film 28 made of a heat-shrinkable film or the like that can be broken in order to prevent collapse. In FIG. 3, the airbag 13 is folded in seven stages in the vertical direction, but the number of folding stages of the airbag 13 is not limited to this, and may be configured to fold two or more stages.
[0020]
The airbag 13 is formed from a flexible woven fabric such as polyester or polyamide, and as shown in FIG. 4, a cylindrical peripheral wall 14 disposed substantially parallel to the vehicle left-right direction, and the peripheral wall 14. It is made into the substantially cylindrical shape provided with the side walls 15 and 16 arrange | positioned so that both right and left ends may be plugged up. In the vicinity of the lower end of the peripheral wall 14, a lead wire insertion hole 14a for inserting a lead wire 22 to be described later and a mounting hole 14b through which a bolt 23 provided in the inflator 21 can be inserted are formed. ing.
[0021]
The rectifying cloth 18 is formed of a flexible woven cloth such as polyester or polyamide like the airbag 13 and has openings 18a and 18a on both sides in the vehicle left-right direction as shown in FIGS. The openings 18a and 18a are formed in a substantially cylindrical shape with a reduced diameter. The inflation gas discharged from the inflator 21 flows out from the openings 18a and 18a. In the vicinity of the lower edge of the rectifying cloth 18, a mounting hole 18 b is formed through which the bolt 23 disposed on the inflator 21 can be inserted. The rectifying cloth 18 is folded and stored together with the airbag 13. As shown in FIG. 4, the inner diameter dimension d <b> 1 in the vicinity of the approximate center of the rectifying cloth 18 is substantially the same as or slightly smaller than the inner diameter dimension d <b> 2 of the airbag 13.
[0022]
The tether 20 is formed from a flexible woven fabric such as polyester or polyamide, like the airbag 13 and the flow straightening cloth 18, and a seat portion for regulating the sectional opening area when the airbag 13 is inflated. 3, the vehicle is disposed at two places, between the occupant seating sites 3L and 3C and between the occupant seating sites 3C and 3R. As shown in FIGS. 4 and 6, the tether 20 is disposed so as to connect the vicinity of the upper end and the vicinity of the lower end of the peripheral wall 14 of the airbag 13 when the inflation is completed , along the vertical direction of the vehicle.
[0023]
As shown in FIGS. 3 and 4, the inflator 21 has a substantially cylindrical shape having a plurality of gas discharge ports 21 a on the upper surface side, and is disposed in the vicinity of the center in the airbag 13 and substantially parallel to the left-right direction of the vehicle. Yes. The inflator 21 is connected to a lead wire 22 to which a gas generation signal is input. The lead wire 22 is connected to a connector (not shown) that passes through a lead wire insertion hole 14a formed in the peripheral wall 14 of the airbag 13 and is electrically connected to the airbag operation circuit. Furthermore, bolts 23 and 23 are welded to the inflator 21 so as to protrude downward in the radial direction.
[0024]
Then, each bolt 23 disposed in the inflator 21 is inserted into the mounting hole 18a formed in the rectifying cloth 18, and is inserted into the mounting hole 14b of the airbag 13, and the spring plate 25 is passed through the mounting hole 18b. The airbag device 11 is attached and fixed to the support plate 8 by inserting the attachment hole 8 a and fixing the nut 26 on the lower surface side of the support plate 8.
[0025]
Next, manufacture of the bench seat 1 of embodiment is demonstrated. First, the tethers 20 and 20 are disposed in the airbag 13 in advance. Next, the inflator 21 is disposed in the rectifying cloth 18 so that each bolt 23 protrudes from the mounting hole 18b. Then, the inflator 21 is housed in the airbag 13 with the rectifying cloth 18 and the bolts 23 protruding, and the spring nut 25 is inserted through the bolts 23. Next, the airbag 13 is folded together with the rectifying cloth 18, the outer periphery is covered with the film 28, and the airbag device 11 is assembled. At this time, the lead wire 22 for operating signal input extending from the inflator 21 is inserted through the lead wire insertion hole 14a and out of the airbag 13. Next, each bolt 23 is inserted into the mounting hole 8 a of the support plate 8, and the nut 26 is fixed on the lower surface side of the support plate 8, and the airbag device 11 is assembled to the support plate 8. Then, the cushion body 6 is placed on the support plate 8 and the cushion body 6 is covered with the skin 7 to form the seat portion 3. The backrest 2 is attached to the seat 3 formed in this way, and the bench seat 1 of the embodiment is manufactured. Then, the completed bench seat 1 is mounted on the vehicle, and the terminal of the lead wire 22 is connected to a control circuit (not shown).
[0026]
In the bench seat 1 of the embodiment, when a predetermined electrical signal is input to the inflator 21 via the lead wire 22, the inflation gas G is discharged upward from each gas discharge port 21a of the inflator 21, The rectifying cloth 18 expands so as to protrude upward. Next, the inflation gas G flows into the airbag 13 from the openings 18a and 18a of the flow regulating cloth 18, and the entire airbag 13 presses the cushion body 6 as shown in FIG. It expands to protrude.
[0027]
That is, in the bench seat 1 of the embodiment, as shown in FIG. 7, the airbag 13 disposed in the seat portion 3 is inflated toward the back surface of the knee K of each occupant P and has moved forward by inertial force. By restraining the back of the thigh T of each occupant P and restraining the forward movement of the buttocks H of each occupant P, the front slip of each occupant P can be prevented. In addition, since a plurality of passengers P seated by one airbag 13 and one inflator 21 can be protected, the occupied space of the airbag device 11 can be reduced, and the airbag device 11 can be reduced. Can be installed compactly.
[0028]
Therefore, in the bench seat 1 according to the embodiment, even if a plurality of occupants P are seated without making the airbag device 11 bulky, it is possible to reliably prevent the front slip of each occupant P that occurs when necessary.
[0029]
Further, at that time, the inflator 21 is disposed substantially at the center of the airbag 13 in the vehicle left-right direction, and the inflation gas discharged from the inflator 21 can be supplied substantially evenly in the vehicle left-right direction of the airbag 13. Therefore, it is possible to evenly inflate the left and right side portions of the airbag 13 in the airbag 13 and to equally protect the occupant P seated on the left and right occupant seating portions 3L and 3R. And in the bench seat 1 of embodiment, since the inflator 21 is arrange | positioned in the approximate center in the vehicle left-right direction of the airbag 13, the baffle cloth 18 protrudes upwards with the gas G for expansion discharged from the inflator 21. The air bag 13 is first inflated near the center. Therefore, it is possible to quickly protect an occupant seated in the central occupant seating site 3C. If the rectifying cloth 18 and the tether 20 described later can be used to inflate the left and right side portions of the airbag 13 evenly, the inflator 21 is disposed at the approximate center of the airbag 13 in the left and right direction of the vehicle. You don't have to.
[0030]
Further, in the embodiment, a substantially cylindrical rectifying cloth 18 having openings 18a and 18a on both sides in the left-right direction of the vehicle is disposed in the airbag 13 so as to cover the inflator 21, and is expanded from the openings 18a and 18a. In this configuration, the gas flows into the airbag 13. Therefore, it is possible to ensure the smooth outflow of the inflation gas to the vicinity of both end portions of the airbag 13 in the left-right direction of the vehicle, that is, the vicinity of the occupant seating portions 3L and 3R, and the airbag 13 can be evenly inflated. In particular, the openings 18a and 18a in the vicinity of the openings 18a and 18a of the rectifying cloth 18 are formed with a reduced diameter, so that the expansion gas can be retained in the rectifying cloth 18 when the expansion gas flows in. The airbag 13 will be inflated. Therefore, the vicinity of the center of the airbag 13 is surely inflated first, so that the occupant seated in the center occupant seating portion 3C can be quickly protected. However, if this point is not taken into consideration, the rectifying cloth 18 may not be disposed. Moreover, it is good also as a structure which arrange | positions the cylindrical rectification | straightening member (diffuser) provided with the rigidity which covers the outer periphery of the inflator 21 instead of the rectification | straightening cloth 18. FIG. When such a rectifying member is used, the rectifying member is provided with gas circulation holes near both ends in the left-right direction of the vehicle, and has an opening larger than the gas circulation hole in the vicinity of the center, near the center of the airbag 13. It is preferable that the structure expands first.
[0031]
Furthermore, in the embodiment, a belt-like tether 20 is disposed in the airbag 13 so as to connect the vicinity of the upper end and the vicinity of the lower end of the peripheral wall 14 in order to regulate the sectional opening area when the airbag 13 is inflated. ing. Therefore, the thickness dimension in the vertical direction in the vicinity of each of the occupant seating portions 3L, 3R, and 3C when the airbag 13 is inflated can be made uniform, and the airbag 13 can be inflated more evenly. P can be protected more stably. If this point is not taken into consideration, the tether 20 may not be disposed.
[0032]
In addition, as shown in FIG. 8, the airbag device 11 may be arranged so that the airbag 13 protrudes toward the vehicle rear side and can be inflated. In this case, as the support plate 36, a mounting portion 37 that protrudes upward in a substantially inverted U-shaped cross section is provided near the end portion on the front side, and is disposed on the inflator 21 on the rear wall portion 37 a of the mounting portion 37. The thing of the structure in which the attachment hole 37b which can insert the volt | bolt 23 to be used is formed is used. At this time, the airbag 13, the rectifying cloth 18, and the tether 20 are deployed on the upper surface of the support plate 36 so as to be sandwiched between the support plate 36 and the cushion body 6 and flattened toward the vehicle rear side. The expansion gas from the inflator 21 flows in and expands upward, and simultaneously expands from the front side of the bench seat 1 toward the rear side. With such a configuration, as shown in FIG. 9, the airbag 13 is inflated upward, and at the same time, is inflated from the front side to the rear side of the bench seat 1. At the same time that K is pushed up, the front surface of the buttock H of each occupant P, that is, the back surface of the thigh T of each occupant P seated is restrained to be pushed backward, Movement can be directly regulated. Therefore, the front slip of each passenger P can be more reliably prevented.
[0033]
In the above case, the airbag 13 together with the rectifying cloth 18 and the tether 20 is folded into a cactus so that the end on the vehicle rear side approaches the end on the vehicle front side and is stored in the seat portion 3. It is good also as a structure. In this case, it is desirable to cover the outer periphery of the folded airbag 13 with a film as in the above-described embodiment.
[0034]
In the embodiment, the bench seat 1 is described by taking a bench seat for three people as an example, but the present invention can also be applied to a bench seat for two people or four or more people. Further, the fixing means for the airbag device 11 to the support plates 8 and 36 is not limited to the bolt 17, and the airbag device 11 may be fixed to the support plates 8 and 36 as a seat frame by welding or the like. Further, the support plates 8 and 36 may be configured from the floor panel itself, and the airbag device 11 may be attached and fixed to the floor panel.
[0035]
In addition to the sheet metal support plates 8 and 36, the seat frame may be a pipe structure or a resin plate.
[Brief description of the drawings]
FIG. 1 is a plan view of a bench seat according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a seat portion taken along a line II-II in FIG.
FIG. 3 is a partially enlarged view showing the vicinity of the airbag device in FIG. 2;
4 is a front view of the airbag used for the bench seat of FIG. 1 when inflation is completed. FIG.
5 is a cross-sectional view taken along the line VV in FIG. 4. FIG.
6 is a cross-sectional view taken along VI-VI in FIG.
7 is a cross-sectional view showing a state where the airbag is inflated in the bench seat of FIG. 1. FIG.
FIG. 8 is a sectional view of a seat portion of a bench seat according to another embodiment of the present invention.
9 is a cross-sectional view showing a state where the airbag is inflated in the bench seat of FIG. 7. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bench seat 3 Seat part 5 Seat cushion 6 Cushion body 7 Skin 8 and 34 Support plate 11 Air bag apparatus 13 Air bag 18 Current flow cloth 18a Opening 21 Inflator 21a Gas discharge port

Claims (2)

A vehicle bench seat capable of seating a plurality of occupants and preventing front slip of each seated occupant when required,
In the lower part of the front end side in the seat portion of the bench seat, an airbag device is stored,
The airbag device includes a bag-like airbag that is disposed over substantially the entire vehicle lateral direction of the seat portion, and an inflator that supplies inflation gas to the airbag .
The inflator is substantially the center in the vehicle left-right direction of the airbag, and is disposed between passenger seating portions on both sides of the airbag in the vehicle left-right direction,
In the airbag, a tether that connects the peripheral walls of the airbag and regulates the cross-sectional opening area when the airbag is inflated is disposed,
The tether is disposed along the vertical direction so as to connect the vicinity of the upper end and the vicinity of the lower end of the peripheral wall of the airbag when the inflation is completed, and is disposed at a position between the occupant seating portions in the seat portion. A bench seat for vehicles. A rectifying member is disposed in the airbag so as to cover the inflator and allow the inflation gas discharged from the inflator to flow out toward both ends of the airbag in the lateral direction of the vehicle. The vehicle bench seat according to claim 1 .

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