JP2007331445A - Vehicular seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular seat with a sliding mechanism for developing an airbag in a seat cushion as intended. <P>SOLUTION: An airbag device 40 is mounted on the upper side of a horizontal frame 34 of a wire frame 32. When an airbag body 40C is inflated, the inflating reaction of the airbag body 40C is supported by a rod 46 fixed to an upper rail 28 and its load is supported via the upper rail 28 and a lower rail by a vehicle body floor 20. Thus, the deformation of the wire frame 32 is suppressed to actualize proper development of the airbag body 40C with almost no downward inflation. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle seat including an airbag in a seat cushion.

  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, the airbag is fixed to the upper side of the support panel spanned on the side frame so that the deployment of the airbag is not hindered.

  However, in this conventional vehicle seat, if the side frame or the like may be greatly deformed by the load when the airbag is deployed, the airbag may not be deployed as intended. Must be increased.

In addition, when the vehicle seat is a slide seat and the seat cushion and the slide mechanism are separate structures, if the airbag is attached to the rigid slide mechanism side, the seat cushion wire frame hinders airbag deployment. Therefore, in the separate structure as described above, the airbag cannot be disposed in the seat cushion.
JP-A-2005-104211

  In view of the above-described facts, an object of the present invention is to provide a vehicle seat capable of deploying an airbag in a seat cushion as intended while having a slide mechanism.

  A vehicle seat according to a first aspect of the present invention is fixed to a vehicle body, and is supported by a pair of left and right lower rails extending in the vehicle front-rear direction on both sides of the lower part of the seat, and slidable in the vehicle front-rear direction by the lower rail. A pair of left and right upper rails, a seat cushion frame fixed to the upper rail side, and an upper side in the seat height direction which is attached to the upper side of the seat cushion frame in the seat height direction and expands when a vehicle collides An airbag device including an airbag that is deployed toward the upper side, and a support member that is fixed to both sides of the upper rail and that can support an inflation reaction force of the airbag when the airbag is inflated. And

  According to the vehicle seat of the first aspect of the present invention, since the airbag is attached to the upper side of the seat cushion frame in the seat height direction, the deployment of the airbag is not hindered by the seat cushion frame. When the vehicle collides, the airbag expands and expands upward in the seat height direction. Here, since both sides of the support member are fixed to the upper rail, when the airbag is inflated, the inflation reaction force of the airbag is supported by the support member, and the load is applied by the vehicle body via the upper rail and the lower rail. Supported. In this way, by sharing the support of the expansion reaction force to the vehicle body, deformation of the seat cushion frame can be suppressed, so that the airbag can be properly deployed without being inflated almost downward.

  A vehicle seat according to a second aspect of the present invention is the vehicle seat according to the first aspect, wherein the airbag device includes a load transmission member for supporting the inflation reaction force of the airbag during inflation on the support member. It is attached.

  According to the vehicle seat of the present invention described in claim 2, since the load transmission member for supporting the inflation reaction force of the airbag at the time of inflation to the support member is attached to the airbag device, at the time of inflation of the airbag The inflation reaction force of the airbag is reliably supported by the support member. As a result, the deformation of the seat cushion frame is surely suppressed, so that the airbag can be properly deployed without being inflated almost downward.

  A vehicle seat according to a third aspect of the present invention is the vehicle seat according to the second aspect, wherein the support member is a rod, and the load transmitting member is located below the seat height direction in the airbag device. The rod is disposed with a gap with respect to the guide before the airbag is inflated, and the rod and the guide are engaged when the airbag is inflated. .

  According to the vehicle seat of the present invention described in claim 3, the rod is disposed with a gap with respect to the guide before the airbag is inflated. Therefore, even if the airbag is pushed downward by the weight of the occupant, the rod Does not contact the guide. Further, since the rod and the guide are engaged when the airbag is inflated, the rod reliably receives the inflation reaction force of the airbag. As a result, the deformation of the seat cushion frame is surely suppressed, so that the airbag can be properly deployed without being inflated almost downward.

  As described above, according to the vehicle seat of the first aspect of the present invention, the airbag in the seat cushion can be deployed as intended while having the slide mechanism.

  According to the vehicle seat of the second aspect, since the inflation reaction force of the airbag is reliably supported by the support member when the airbag is inflated, the deformation of the seat cushion frame is reliably suppressed, and the airbag is It has an excellent effect that it can be deployed as intended.

  According to the vehicle seat of the third aspect, since the rod and the guide are disposed with a gap during normal use, the rod contacts the guide even when the airbag is pushed downward by the weight of the occupant. There is no, and ride comfort is good. Further, when the airbag is inflated, the airbag can be deployed as intended by engaging the rod with the guide. That is, since the inflation reaction force of the airbag is reliably supported by the rod when the airbag is inflated, the seat cushion frame can be reliably prevented from being deformed, and the airbag can be deployed as intended. Have

(Configuration of the embodiment)
An embodiment of a vehicle seat in 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.

  As shown in FIG. 1, a vehicle seat 14 on which an occupant P is seated is disposed in the vehicle interior 10, and a seat belt device 12 for restraining the occupant P is provided on the vehicle seat 14. ing.

  The vehicle seat 14 includes a seat cushion 16 that supports the buttocks and thighs of the occupant P, a seat back 18 that is tiltably supported on the rear end side of the seat cushion 16 and supports the back of the occupant P, and a seat. And a headrest 19 that is provided at the upper end of the back 18 so as to be vertically adjustable and supports the head of the occupant P. The seat cushion 16 has an upper surface portion as a seating portion for the occupant P. In this embodiment, the seat cushion 16 is a separate structure from the seat cushion 16 (R / C Assy) and constitutes a part of the vehicle seat 14. The seat cushion 16 is slidable in the vehicle longitudinal direction by the mechanism 22.

  The seat belt device 12 is a three-point type in the present embodiment, and includes a webbing 12A for restraining an occupant, a webbing take-up device 12B that winds one end of the webbing 12A in a layered manner on a take-up shaft, and a webbing An anchor plate 12C to which the other end portion of 12A is locked, a shoulder anchor 12D that is supported and folded back so that an intermediate portion of the webbing 12A can be inserted, and a tongue plate that is movably inserted and supported by the intermediate portion of the webbing 12A. (Not shown) and a buckle device (not shown) standing on the side of the seat cushion 16.

  As shown in FIGS. 2 and 4, a pair of left and right lower rails 24 (see FIG. 4) constituting a part of the slide mechanism portion 22 are fixed to a vehicle body floor 20 as a vehicle body via a bracket 26. The vehicle extends in the vehicle longitudinal direction on both lower sides. A pair of left and right upper rails 28 constituting a part of the slide mechanism portion 22 are supported on the lower rail 24 so as to be slidable in the vehicle front-rear direction. Here, the lower rail 24 and the upper rail 28 are high-rigidity members. A substantially U-shaped adjuster 30 (see FIG. 2) is welded to the upper rail 28 on the rear side of the seat to connect the pair of left and right upper rails 28.

  As shown in FIG. 2, a wire frame 32 as a substantially square frame-like seat cushion frame is disposed inside the seat cushion 16. The wire frame 32 is fixed to the upper rail 28 on both sides, and includes two horizontal frames 34 that extend in the seat width direction (arrow 14W direction) at the front portion of the seat cushion 16. Near one end of one horizontal frame 34, a substantially U-shaped hook portion 34A extending downward is formed for locking, and this hook portion 34A is inserted into a substantially cylindrical resin clip 35. Together with the resin clip 35, it is inserted into and locked (fixed) into a locking hole (not shown) of the extended plate 29 protruding from the upper rail 28. The horizontal frame 34 has a step shape in which a longitudinal intermediate portion 34B, which is an intermediate portion in the sheet width direction (arrow 14W direction), is lowered by one step downward in the seat height direction (arrow 14H direction) with respect to the longitudinal side portions 34C. It is formed, and an airbag device 40, which will be described in detail later, is attached to the longitudinal intermediate portion 34B of the horizontal frame 34 (the difference in height between the longitudinal side portions 34C and the longitudinal intermediate portion 34B is in the accommodated state. The thickness of the airbag device 40 is substantially equal.).

  The wire frame 32 includes a reinforcing frame 33 extending in the seat width direction (arrow 14W direction) on the rear side in the vehicle front-rear direction of the horizontal frame 34, and substantially in the center in the seat width direction (arrow 14W direction). And a central frame 36 extending in the longitudinal direction of the vehicle. An end of the center frame 36 on the vehicle rear side is a hook portion 36A that is folded back in a J-shape, and the hook portion 36A stands up in the seat height direction (arrow 14H direction) of the adjuster 30. The upper plate 31 is inserted into the locking hole 31A and locked (fixed). The rising plate 31 is disposed at a substantially middle portion of the adjuster 30 in the sheet width direction (arrow 14W direction).

  As shown in FIG. 4, which is a cross-sectional view of the front portion of the seat cushion 16, a seat cushion pad 38 is disposed above the wire frame 32 in the seat height direction (arrow 14H direction). The seat cushion pad 38 is set to a predetermined hardness using a resin such as urethane to create the shape of the seat cushion 16 and to be elastically deformable. The surface of the seat cushion pad 38 is covered with a skin material 39.

  As shown in FIG. 2, the airbag case of the airbag device 40 is attached to the longitudinal intermediate portion 34 </ b> B of the lateral frame 34 via a triangular plate-like mounting plate 42 on the upper side in the seat height direction (arrow 14 </ b> H direction). 40A is attached. That is, as shown in FIGS. 3 and 4, a bolt 40B protruding downward is embedded in the airbag case 40A, and the bolt 40B is inserted into the through hole 42A (see FIG. 3) of the mounting plate 42. The nut 41 is screwed from the lower side of the mounting plate 42 through the mounting plate 42. Thereby, as shown in FIG. 2, the airbag device 40 is disposed at an intermediate portion in the seat width direction (arrow 14W direction).

  As shown in FIG. 4, the airbag body 40 </ b> C of the airbag device 40 is accommodated in the airbag case 40 </ b> A in a folded state. An inflator 43 accommodated in the airbag case 40A is connected to the airbag body 40C. The inflator 43 is connected to a control device (not shown), and generates gas by operating under the control of the control device. Thus, the airbag main body 40C is inflated at the time of a vehicle collision and is deployed toward the upper side in the seat height direction (arrow 14H direction).

  As shown in FIG. 2, a guide 44 as a load transmission member is attached to the lower surface of the airbag case 40 </ b> A in the airbag device 40 which is the lower side in the seat height direction (arrow 14 </ b> H direction). The guide 44 is formed in an L shape in cross section, includes a hanging portion 44A that is bent and hangs downward, and is fixed to the lower surface front portion and the lower surface rear portion of the airbag case 40A.

  Rods 46 as support members are respectively provided at positions corresponding to the lower portions of the two guides 44. The rod 46 extends in the seat width direction (arrow 14W direction), is fixed to the upper rail 28 at both sides, and an intermediate portion 46A is disposed substantially below the airbag device 40. The airbag in the airbag device 40 Before the main body 40 </ b> C is expanded, the main body 40 </ b> C is disposed with a gap with respect to the guide 44. The rod 46 has higher rigidity than the horizontal frame 34, and an intermediate portion 46A serving as a central region in the seat width direction (arrow 14W direction) is located above the both sides in the seat width direction in the seat height direction (arrow 14H direction). It is formed in a step shape that rises one step to the side. The horizontal frame 34 is more flexible than the rod 46. In this embodiment, as shown in FIG. 2, the diameter of the horizontal frame 34 is smaller than the diameter of the rod 46 (the horizontal frame 34 is thinner than the rod 46). However, for example, a material that is the same as the diameter of the rod 46 and is weak (easy to bend) may be applied to the horizontal frame 34.

  As shown in FIG. 5, the rod 46 can support the inflation reaction force of the airbag body 40 </ b> C when the airbag body 40 </ b> C is inflated in the airbag device 40. Here, the guide 44 is formed in an L shape and includes a hanging portion 44A, so that it does not engage with the rod 46 when the airbag main body 40C is inflated (for preventing from coming off the rod 46). In this way, the inflation reaction force of the airbag main body 40C during inflation is supported by the rod 46 to transmit the load.

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

  In the vehicle seat 14 shown in FIG. 4, during normal use, the rod 46 and the guide 44 are disposed with a gap, so that the airbag body 40C (airbag device 40) is pushed downward by the weight of the passenger P. However, the rod 46 does not come into contact with the guide 44 and the ride comfort is good. At the time of a vehicle collision (for example, at the time of a frontal collision), the inflator 43 is operated under the control of a control device (not shown) to generate gas, whereby gas is supplied to the airbag body 40C in the airbag device 40. As a result, as shown in FIG. 5, the airbag main body 40C is inflated and deployed toward the upper side in the seat height direction (arrow 14H direction).

  Here, since the airbag device 40 including the airbag body 40C is attached to the upper side of the wire frame 32 in the seat height direction (arrow 14H direction) of the lateral frame 34, the deployment of the airbag body 40C is the lateral frame. It is not obstructed by 34 (wire frame 32). Further, as shown in FIG. 2, since both sides of the rod 46 are fixed to the upper rail 28, when the airbag body 40C is inflated, the air bag body 40C accompanying the support of the occupant P (see FIG. 1) The expansion reaction force (downward load) is supported (transmitted) by the rod 46, and the load is supported by the vehicle body floor 20 via the upper rail 28 and the lower rail 24 (see FIG. 5). In this way, by sharing the support of the expansion reaction force to the vehicle body floor 20, the deformation of the wire frame 32 can be suppressed, so that it is possible to prevent the airbag body 40C from being poorly expanded due to the load escaping during expansion, that is, The airbag main body 40C can be properly deployed without substantially inflating downward.

  In particular, in the present embodiment, the guide 44 that engages with the rod 46 is attached to the lower side of the seat height direction (the direction of the arrow 14H) in the airbag device 40. Therefore, when the airbag body 40C is inflated, the rod 46 The expansion reaction force of the bag body 40C is reliably received. Thereby, the inflation reaction force of the airbag main body 40C is reliably supported by the vehicle body floor 20 via the upper rail 28 and the lower rail 24 (see FIG. 5). In the initial stage of inflation of the airbag main body 40C, the guide 44 guides the airbag device 40 in a substantially downward direction toward the predetermined position because the hanging portion 44A of the guide 44 hits the rod 46.

  As described above, by reliably supporting the inflation reaction force of the airbag main body 40C on the rod 46, it is possible to reliably suppress the deformation of the lateral frame 34 (wire frame 32), and as a result, the slide mechanism While providing the portion 22, the airbag body 40C in the seat cushion 16 can be properly deployed as intended.

(Supplementary explanation of the embodiment)
In the above embodiment, the case where the support member is the rod 46 has been described. However, the support member may be another support member such as a cylindrical member or a plate material. Moreover, in the said embodiment, although the two rods 46 as a supporting member are provided, the supporting member may be one or three or more.

  Moreover, although the said embodiment demonstrated the case where the load transmission member was the L-shaped guide 44 attached to the airbag apparatus 40, a load transmission member is attached to an airbag apparatus, for example, is an airbag. Hook-like engagement means that engages with the support member when inflated, and the airbag device and the support member are attached to the airbag device and a long groove is formed, and the support member is inserted into the long groove so as to be relatively movable. It may be another load transmission member such as a connecting member for connecting the two.

  Furthermore, in the said embodiment, although the guide 44 as a load transmission member is attached to the lower surface below the seat height direction (arrow 14H direction) of the airbag case 40A in the airbag device 40, the load transmission member May be attached to other portions of the airbag device, such as being attached to the front and rear portions of the airbag case 40A in the vehicle longitudinal direction.

  Furthermore, in the above embodiment, the wire frame 32 as a seat cushion frame is fixed to the upper rail 28 via the resin clip 35 and the adjuster 30, but the seat cushion frame may be directly fixed to the upper rail. .

It is a side view showing a vehicular seat concerning an embodiment of the present invention. It is a perspective view which shows the principal part of the vehicle seat which concerns on embodiment of this invention. It is a disassembled perspective view for demonstrating attachment of the airbag apparatus in embodiment of this invention. It is sectional drawing which shows the front part of the seat cushion in embodiment of this invention (it shows in the state by which the airbag main body is folded). It is sectional drawing which shows the front part of the seat cushion in embodiment of this invention (it shows in the state which the airbag main body is expand | deployed).

Explanation of symbols

14 Vehicle seat 14H Seat height direction 20 Vehicle body floor (vehicle body)
24 Lower rail 28 Upper rail 32 Wire frame (seat cushion frame)
40 Airbag Device 40C Airbag Body (Airbag)
44 Guide (Load transmission member)
46 Rod (support member)

Claims (3)

A pair of left and right lower rails fixed to the vehicle body and extending in the vehicle longitudinal direction on both sides of the lower part of the seat;
A pair of left and right upper rails supported by the lower rail so as to be slidable in the vehicle longitudinal direction;
A seat cushion frame fixed to the upper rail side;
An airbag device including an airbag attached to an upper side in a seat height direction in the seat cushion frame and inflated at the time of a vehicle collision and deployed toward an upper side in the seat height direction;
A support member that is fixed on both sides to the upper rail, and that can support an inflation reaction force of the airbag when the airbag is inflated;
A vehicle seat comprising:   The vehicle seat according to claim 1, wherein a load transmission member for supporting the inflation reaction force of the airbag during inflation on the support member is attached to the airbag device. The support member is a rod, and the load transmission member is a guide attached to the lower side of the seat height direction in the airbag device,
3. The vehicle according to claim 2, wherein the rod is disposed with a gap with respect to the guide before the airbag is inflated, and the rod and the guide are engaged when the airbag is inflated. Sheet.

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