JP2008062792A - Vehicular seat cushion - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular seat cushion capable of stabilizing the deploying direction of an air bag to stabilize the performance of an air bag device. <P>SOLUTION: A cushion part 30 is formed with a guide recessed part 38 extending backward of a vehicle from over the air bag 44 by a main pad 32 and a pad 34 with a sitting sensor. When the air bag 44 is inflated to deploy in a collision of a vehicle, the air bag 44 deploys, entering a space between the main pad 32 and the pad 34 with a sitting sensor, along the guide recessed part 38 backward of the vehicle from over the air bag. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle seat cushion having an airbag disposed therein.

  In a vehicle seat, an airbag may be provided in a seat cushion in order to limit inertial movement of an occupant's thigh or the like at the time of a collision (see, for example, Patent Document 1). In such a seat cushion, an airbag is disposed close to the lower side of the cushion pad.

However, in this conventional structure, since there is no mechanism for controlling the deployment direction of the airbag, the inflated airbag may protrude forward, and the airbag deployment direction is not stable. However, stable performance cannot be demonstrated.
JP 2005-112000 A

  In view of the above facts, an object of the present invention is to provide a vehicle seat cushion in which the airbag device can exhibit stable performance by stabilizing the deployment direction of the airbag.

  A vehicle seat cushion according to a first aspect of the present invention is supported by a seat cushion frame, and is supported by the seat cushion frame, and an airbag device including an airbag that is inflated and deployed when a vehicle collides. And a cushion part that receives the inflating force of the airbag on the lower surface side, and guide means for restricting a direction in which the airbag is deployed and guiding the airbag to the rear side of the vehicle.

  According to the vehicle seat cushion of the first aspect of the present invention, the guide means for guiding the airbag to the rear side of the vehicle by limiting the direction in which the airbag is deployed is provided. When the bag is inflated to be in a deployed state, the airbag is deployed toward the vehicle rear side.

  A vehicle seat cushion according to a second aspect of the present invention is the vehicle seat cushion according to the first aspect, wherein the guide means is formed in the cushion portion and extends from above the airbag toward the vehicle rear side. It is characterized by being.

  According to the vehicle seat cushion of the second aspect of the present invention, since the guide recessed portion extending from the upper side of the airbag toward the rear side of the vehicle is formed in the cushion portion, the airbag is prevented at the time of a vehicle collision. When the airbag is inflated and deployed, the airbag is reliably deployed along the guide recess from the upper side toward the vehicle rear side.

  A vehicle seat cushion according to a third aspect of the present invention is the vehicle seat cushion according to the second aspect, wherein the cushion portion constitutes a first cushion portion constituting an upper portion of the cushion portion and a lower portion of the cushion portion. A second cushion portion, wherein the guide recess is formed by the first cushion portion and the second cushion portion.

  According to the vehicle seat cushion of the third aspect of the present invention, the cushion portion includes, for example, a first cushion portion that constitutes an upper portion thereof for mounting a seating sensor, improving a seating feeling of a seated person, and the like. And a guide recess is formed by the first cushion portion and the second cushion portion, so that the airbag is inflated and deployed when the vehicle collides. The airbag is deployed between the first cushion portion and the second cushion portion from above to the rear side of the vehicle.

  As described above, according to the vehicle seat cushion of the first aspect of the present invention, the deployment direction of the airbag can be stabilized, and as a result, the airbag device exhibits stable performance. It has an excellent effect of being able to.

  According to the vehicle seat cushion of the second aspect, by deploying the airbag along the guide recess, it has an excellent effect that the deployment direction of the airbag can be reliably stabilized.

  According to the vehicle seat cushion of claim 3, the deployment direction of the airbag can be further stabilized by effectively using the first cushion portion and the second cushion portion that are arranged vertically. Has an excellent effect.

(Configuration of the embodiment)
An embodiment of a vehicle seat cushion according to the present invention will be described with reference to the drawings. In the figure, the arrow UP indicates the upward direction of the vehicle, and the arrow FR indicates the forward direction of the vehicle.

  FIG. 1 shows a vehicle seat 10 provided with a vehicle seat cushion 14 (hereinafter simply referred to as “seat cushion 14”). A vehicle seat 10 for seating an occupant in a vehicle compartment supports a seat cushion 14 that supports the occupant's buttocks and thighs, and a rear end side of the seat cushion 14 so as to be tiltable to support the back of the occupant. And a headrest (not shown) that is provided at the upper end of the seatback 12 so as to be vertically adjustable and supports the head of the occupant. The seat cushion 14 has an upper surface portion that serves as a seat for an occupant, and is slidable in the vehicle front-rear direction by a slide mechanism portion (not shown).

  The seat cushion 14 is disposed on the seat cushion frame 16 that functions as a skeleton member disposed in the seat cushion 14, a seat cushion spring 28 that spans the seat cushion frame 16, and the seat cushion spring 28. A cushion portion 30 supported by the seat cushion frame 16 via a seat cushion spring 28, a skin material 40 bonded to the surface of the cushion portion 30 to cover the cushion portion 30, and a vehicle supported by the seat cushion frame 16 And an airbag device 42 including an airbag 44 that is inflated and deployed when a collision occurs.

  As shown in FIG. 2, the seat cushion frame 16 is formed in a frame shape in plan view, and a pair of left and right side frame portions 20 each extending in the longitudinal direction of the vehicle, and a pair of left and right side frames. The seat pan 18 that is spanned between the front end portions of the portion 20 and the rod portion 22 that connects the rear end portions of the pair of left and right side frame portions 20 are configured.

  As shown in FIGS. 1 and 2, the front end 18 </ b> A of the seat pan portion 18 in the vehicle front-rear direction is suspended from the vehicle lower side. On the vehicle rear side of the front portion 18 </ b> A, a concave (substantially box-shaped) concave portion 18 </ b> B that forms a part of the seat pan portion 18 by opening the vehicle upper side is formed. The recessed portion 18B also serves as an airbag case for housing the inflator 46 in the airbag device 42. The vehicle rear side of the recessed portion 18B is a rear portion 18C of the seat pan portion 18 and extends stepwise on the vehicle rear lower side.

  The inflator 46 has a substantially cylindrical shape with the seat width direction (arrow 14W direction in FIG. 2) as an axial direction, and is connected to a control device (not shown). It comes to erupt. As shown in FIG. 1, the airbag 44 in the airbag device 42 is arranged in a folded state on the vehicle upper side of the inflator 46 so that the gas ejected from the inflator 46 flows in. Here, the inflator 46 is completely accommodated in the recessed portion 18B, but the airbag 44 is disposed above the opening of the recessed portion 18B above the inflator 46. Further, as shown in FIG. 2, the folded airbag 44 extends in the seat width direction (in the direction of arrow 14 </ b> W) on the seat pan portion 18. As shown in FIG. 3, in the inflated state of the airbag 44, the cushion portion 30 receives the inflating force of the airbag 44 on the lower surface side, and the inflation reaction force of the airbag 44 is the seat pan portion. 18 to be supported.

  As shown in FIGS. 1 and 2, a reinforcing plate 24 is disposed on the vehicle lower side of the rear portion 18 </ b> C of the seat pan portion 18. The reinforcing plate 24 is formed in a substantially U shape with the vehicle lower side open in the longitudinal cross-sectional shape, and both sides in the seat width direction (arrow 14W direction in FIG. 2) are hung on the side frame portion 20 in the seat cushion frame 16. Has been passed. The reinforcing plate 24 can support the rear portion 18C of the seat pan portion 18 when the airbag 44 of the airbag device 42 is deployed.

  As shown in FIG. 1, the cushion part 30 constitutes a lower part of the cushion part 30 by being separated from the main pad 32 as a first cushion part constituting the upper part of the cushion part 30 and the main pad 32. And a pad 34 with a seating sensor as a second cushion portion. Thus, in this embodiment, the cushion part 30 is comprised by the upper and lower two pads (the main pad 32 and the pad 34 with a seating sensor), and the seating sensor 36 mentioned later is arrange | positioned in the cushion part 30. Because. The main pad 32 and the pad 34 with a seating sensor are made of urethane foam or the like, and create the shape of the seat cushion 14 and also serve as a cushion. The cushion portion 30 has a different hardness depending on the part, and the hardness of the main pad 32 and the hardness of the pad 34 with the seating sensor are used to improve the seating feeling and the seating performance of the seated person. Different configurations may be used.

  A seating sensor 36 that functions as occupant seating state detection means is attached to the upper surface of the pad 34 with seating sensor in order to detect whether or not an occupant is seated on the seat cushion 14. As the seating sensor 36, for example, a pressure detection sensor configured in a sheet shape can be applied. In the present embodiment, the seat-like seating sensor 36 is applied, but the seating sensor is not necessarily a seat-like sensor.

  The main pad 32 is disposed over the entire length of the cushion portion 30 in the front-rear direction of the seat at the upper portion of the cushion portion 30, and on the front side of the seat, the front pad 18A of the seat pan portion 18 faces downward. It has a shape that extends to the front side, and on the rear side of the seat, it has a shape that extends to the lower rear side of the vehicle on the rear side of the rod portion 22. The main pad 32 is formed with a notch 33 that is notched so as to be recessed from the lower side of the vehicle from the top of the airbag 44 to the vicinity of the center in the front-rear direction of the seat.

  The notch 33 includes a front wall portion 33A disposed on the vehicle front side, an upper wall portion 33B disposed on the vehicle upper side, and a rear wall portion 33C disposed on the vehicle rear side. Yes. The front wall portion 33A of the cutout portion 33 is inclined upward in the rear of the vehicle, and a folded airbag 44 is disposed close to the vehicle rear side at the lower portion of the front wall portion 33A. The upper wall portion 33B of the cutout portion 33 is separated from the folded airbag 44 by a predetermined distance, and has a substantially horizontal plane facing the vehicle lower side. The rear wall portion 33 </ b> C in the notch 33 is inclined downward in the rear of the vehicle and extends to the upper surface position of the pad 34 with the seating sensor. Further, a bent portion 33D that is an intermediate portion from the front wall portion 33A side to the upper wall portion 33B side, and a bent portion 33E that is an intermediate portion from the upper wall portion 33B side to the rear wall portion 33C side are formed in an R shape. Is formed.

  In the main pad 32, the upper portion of the notch 33 supports a portion closer to the occupant's knee, so that a relatively small load acts on the lower side of the vehicle. For this reason, the main pad 32 can substantially maintain the shape of the notch 33 in the occupant seated state without arranging a member that supports the notch 33.

  The pad 34 with the seating sensor is disposed in the lower part of the cushion portion 30 at an intermediate portion of the cushion portion 30 in the seat front-rear direction, and extends substantially in the seat front-rear direction in a longitudinal sectional view. The front portion 34A on the vehicle front side of the pad 34 with the seating sensor blocks a part of the opening (portion closer to the vehicle rear side) in the notch 33 of the main pad 32.

  The cushion portion 30 is formed with a guide recess 38 as a guide means by the cutout portion 33 of the main pad 32 and the front portion 34A of the pad 34 with the seating sensor. Extending from above the vehicle toward the vehicle rear side. The guide recess 38 secures a deployment space 39 for the airbag 44 and restricts the deployment direction of the airbag 44 to guide the airbag 44 to the vehicle rear side.

  In addition, the skin material 40 which consists of cloth etc. is adhere | attached on the surface of the cushion part 30, and such a seat cushion 14 (vehicle seat 10) may be called an adhesive sheet. The adhesive sheet provided with the seating sensor 36 in the present embodiment has a structure that is vertically divided by the main pad 32 and the pad 34 with the seating sensor.

(Operation and effect of the embodiment)
Next, the operation and effect of the above embodiment will be described.

  As shown in FIG. 1, the cushion portion 30 is formed with a guide recess 38 extending from the upper side of the airbag 44 toward the vehicle rear side by the main pad 32 and the pad 34 with a seating sensor. When the airbag 44 is inflated and deployed at the time of the collision, as shown in FIG. 3, the airbag 44 extends along the guide recess 38 from the upper side toward the vehicle rear side along the main pad 32. And the pad 34 with the seating sensor.

  That is, as shown in FIG. 3A, when the airbag 44 is initially deployed, the airbag 44 is guided in the deployment space 39 to the notch 33 in the guide recess 38 toward the vehicle rear side (arrow A direction). And develop. Here, the airbag 44 is restricted (restricted) by the upper wall portion 33B of the cutout portion 33 and the front wall portion 33A of the cutout portion 33 by the upper wall portion 33B of the cutout portion 33. ), The deployment direction of the airbag 44 is restricted (restricted), and the airbag 44 is inflated toward the vehicle rear side. As a result, as shown in FIG. 3B, when the airbag 44 is fully deployed, the airbag 44 enters between the main pad 32 and the pad 34 with the seating sensor, and the deployment shape is restricted (restricted). The air bag is deployed (airbag deployment shape regulation structure).

  As described above, according to the vehicle seat cushion 14 of the present embodiment, the deployment direction of the airbag 44 is stabilized by effectively using the main pad 32 and the pad 34 with the seating sensor that are arranged above and below. be able to. As a result, the airbag device 42 can exhibit stable performance, so that supportability of the occupant at the time of a vehicle collision is ensured, and a so-called submarine phenomenon in which the occupant is in a position to sink into the seat cushion 14. Occurrence can be suppressed.

  Further, by stabilizing the deployment direction of the airbag 44, it is possible to avoid the problem that the inflation force of the airbag 44 is concentrated on a specific portion of the cushion portion 30, and it is possible to suppress damage to the cushion portion 30. , Repair costs can be reduced. Furthermore, in the main pad 32, the material cost of the part notched for forming the notch 33 can be reduced. Furthermore, since the airbag 44 is stored in a folded form, it is easy to secure the deployment space 39.

(Supplementary explanation of the embodiment)
In the above-described embodiment, the case where the guide means is the guide recess 38 has been specifically described. Other guide means such as a guide mechanism (guidance mechanism) having a guide plate arranged at the position of the wall 33A as one component may be used.

  Further, as another example of the guide means, for example, a seat pan that is a substantially rectangular panel material in a plan view formed in a predetermined curved surface shape is disposed on the inner bottom surface side of the seat cushion frame, In a vehicle seat in which the lower end portion of the tension coil spring is locked at the four corners and the upper end portion of the tension coil spring is formed on the seat cushion frame, the airbag device is disposed at a predetermined interval below the seat pan. By arranging the rear surface of the seat pan as a guide surface for guiding the airbag and erecting guide walls on both sides thereof, the seat pan restricts the direction in which the airbag is deployed and the airbag It is good also as a structure used as the guide means which guides to the vehicle rear side.

  Moreover, in the said embodiment, although the cushion part 30 becomes a structure provided with two pads of the main pad 32 and the pad 34 with a seating sensor, even if a cushion part is comprised with one pad, Three or more pads may be configured, and a guide recess extending from the upper side of the airbag toward the vehicle rear side may be formed in such a cushion portion.

  Furthermore, in the above-described embodiment, nothing is covered on the back surface (the vehicle lower side surface) of the notch 33. However, when the airbag 44 is deployed, damage to the main pad 32 is reliably suppressed to further improve the airbag performance. For the purpose of illustration, a sheet-like member such as a non-woven fabric may be disposed on the back surface of the notch 33 by, for example, adhesion.

  Furthermore, in the above embodiment, the airbag device 42 that is not in the case is used and the inflator 46 is housed in the recessed portion 18B of the seat pan portion 18, but the airbag device in the case is used as the seat cushion frame. It may be attached and supported. In that case, the form which does not have a door part in a case upper part may be sufficient, and the form in which the expandable door part is provided may be sufficient.

  In the above embodiment, the seating sensor 36 is attached to the upper surface portion of the second cushion portion (pad 34 with the seating sensor) that constitutes the lower portion of the cushion portion 30. For example, the seating sensor is an upper portion of the cushion portion. May be attached to the lower surface portion of the first cushion portion constituting the.

It is a longitudinal cross-sectional view which shows the vehicle seat cushion which concerns on embodiment of this invention (equivalent to the 1-1 line expanded sectional view of FIG. 2). It is a top view which shows the vehicle seat cushion which concerns on embodiment of this invention (it shows in the state which saw through the skin material and the cushion part). It is a longitudinal cross-sectional view which shows the state change at the time of airbag expansion | deployment of the vehicle seat cushion which concerns on embodiment of this invention (a state change is carried out in order of FIG. 3 (A) and FIG. 3 (B)).

Explanation of symbols

14 Seat cushion (vehicle seat cushion)
16 Seat cushion frame 30 Cushion part 32 Main pad (first cushion part)
34 Pad with seating sensor (second cushion part)
38 Guide recess (guide means)
42 Airbag Device 44 Airbag

Claims (3)

An airbag device comprising an airbag supported by a seat cushion frame and inflated and deployed when a vehicle collides;
A cushion part supported by the seat cushion frame and receiving the inflation force of the airbag on the lower surface side;
Guide means for restricting a direction in which the airbag is deployed and guiding the airbag to the vehicle rear side;
A vehicle seat cushion characterized by comprising:   The vehicle seat cushion according to claim 1, wherein the guide means is a guide recess formed in the cushion portion and extending from above the airbag toward the vehicle rear side. The cushion part includes a first cushion part constituting an upper part of the cushion part, and a second cushion part constituting a lower part of the cushion part,
The vehicle seat cushion according to claim 2, wherein the guide recess is formed by the first cushion portion and the second cushion portion.

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