JP5209541B2 - Instrument panel with airbag door - Google Patents

Description

  The present invention relates to an instrument panel with an airbag door having an airbag door that opens with the inflation pressure of the airbag and an airbag chute that guides the inflation of the airbag.

In Patent Document 1, a substantially rectangular airbag door portion that is opened by the inflation pressure of the airbag is defined in the front portion of the passenger seat of the instrument panel body, and an airbag chute is disposed on the rear surface of the instrument panel body. It is attached so as to surround the bag door. The airbag chute has a substantially rectangular tubular chute that guides the inflation of the airbag, and the chute is configured substantially perpendicular to the back surface of the instrument panel body.
JP 2004-322934 A

  In such an instrument panel, the rigidity around the airbag door is increased due to the presence of the airbag chute. For example, a sudden brake is applied during traveling and the passenger's head in the passenger seat is raised above the airbag door. When a so-called head impact occurs, the impact load rebounds greatly to the occupant, resulting in greater damage to the occupant. In addition, the impact load may cause the airbag door portion to break unexpectedly.

  In general, there is a demand for more reliably opening the airbag door when the airbag apparatus is activated.

  The present invention has been made in view of the above points, and an object of the present invention is to protect an occupant and prevent an unexpected breakage of a portion to be broken of an airbag door portion, and further to an airbag door portion. Is to open the door more reliably.

  In order to achieve the above object, the present invention is characterized in that the shape of the proximal end side portion of the chute portion is devised.

Specifically, in the present invention, a substantially rectangular airbag door portion that is opened by the inflation pressure of the airbag when the airbag device is activated is partitioned and formed in the front part of the passenger seat of the instrument panel body,
An airbag chute protrudes from the back of the instrument panel body so as to surround the airbag door portion, and the airbag chute has a latching portion for latching the airbag device provided in the middle in the protruding direction. An instrument panel with an airbag door having a substantially rectangular tubular chute that houses an airbag device therein and guides the inflation of the airbag when the airbag device is in operation is as follows. I took the right solution.

That is, in the first aspect of the present invention, the chute portion protrudes from the outer periphery of the airbag door portion, and at least at the occupant side wall portion of the chute portion, the base end side is based on the locking portion. An inclined surface portion that inclines toward the inner side of the airbag door portion as it goes to the end, a front end side that includes the locking portion forms a vertical surface portion that is substantially perpendicular to the back surface of the instrument panel body , and the inclined surface portion The bag device (9) extends downward from the upper end of the airbag .

  According to a second aspect of the present invention, in the instrument panel with an airbag door portion according to the first aspect, the inclined surface portion is formed more fragile than the vertical surface portion.

  According to a third aspect of the present invention, in the instrument panel with an airbag door portion according to the first or second aspect, the airbag chute integrally protrudes outward from the base end of the chute portion. The flange portion is joined to the rear surface of the instrument panel main body so as to correspond to the outer peripheral edge portion of the airbag door portion.

  According to the first aspect of the present invention, when the brake is suddenly applied and the passenger's head in the passenger seat collides with the airbag door portion from above, the inclined surface portion is bent and deformed by the impact load, This deformation operation absorbs and reduces the impact load. Further, since the impact load is absorbed and relaxed at the inclined surface portion, an excessive impact load is hardly applied to the planned breakage portion of the airbag door portion, so that an unexpected breakage of the planned breakage portion is prevented.

  Further, when the airbag device is operated, the inflated airbag is guided along the inclined surface portion, and the inflating pressure is concentrated on the central portion of the airbag door portion, and the inflated airbag has the inclined surface portion outward. Since the pressing force is applied to the outer peripheral edge of the airbag door portion, the scheduled breakage portion of the airbag door portion is easily broken, and the airbag door portion is more reliably opened.

  According to invention of Claim 2, since an inclined surface part is formed weakly and becomes easy to bend, an impact load is absorbed and relieved more effectively. In addition, unexpected breakage of the planned breakage portion can be prevented more reliably.

  According to the third aspect of the present invention, in addition to the effect of the first aspect, the outer peripheral edge of the airbag door is reinforced by the flange, so that the inflation pressure of the airbag is concentrated on the airbag door. The opening of the airbag becomes more reliable. On the other hand, there is a problem that the head impact easily acts on the occupant due to the reinforcement, but the impact load is absorbed and relaxed by the inclined surface portion, and an adverse effect on the occupant protection by the reinforcement is suppressed.

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

(Embodiment 1)
FIG. 1 shows a front part of a passenger seat of an instrument panel 1 with an airbag door according to Embodiment 1 of the present invention.

  As shown in FIG. 2, the instrument panel 1 includes an instrument panel body 3 having a single-layer structure made of a rigid resin, and the front side of the passenger seat on the back of the instrument panel body 3 has two opposing sides. An instrument panel main body 3 corresponding to the groove portion 5 is formed in the V-shaped groove portion 5 that extends in the vehicle width direction and has two other opposing sides extending in parallel in the longitudinal direction of the vehicle body to form a substantially rectangular shape in plan view. The portion is formed to be thin, and a planned fracture portion 7 having a substantially rectangular shape in plan view is formed. The scheduled break portion 7 defines a single-open type substantially rectangular airbag door portion 11 that is opened by the inflation pressure of the airbag when an airbag device 9 described later is operated.

A resin airbag chute 13 (see FIG. 3) is integrally joined and protruded from the back surface of the instrument panel body 3 by vibration welding so as to surround the airbag door 11. The airbag chute 13 includes a substantially rectangular tube-like chute 15 that protrudes from the outer peripheral edge of the airbag door 11. The airbag chute 13 has an upper end of the chute 15 on the inner side of the opening end for inflation of the airbag. A substantially rectangular shooting port 17 is formed. The chute 15 includes a rear side wall 15a that extends in the vehicle width direction on the passenger side, a front side wall 15b that is disposed opposite to the front side of the rear side wall 15a and extends in the vehicle width direction, the rear side wall 15a and the front The left and right side wall portions 15c extend in the longitudinal direction of the vehicle body so as to connect the left edges and the right edges of the side wall portions 15b. A plurality of locking holes 19 as locking portions for locking the airbag device 9 are formed through the middle portion in the protruding direction of the rear side wall portion 15a and the front side wall portion 15b. The rear side wall portion 15a and the front side wall portion 15b of the chute portion 15 constitute an inclined surface portion 16 that inclines to the inner side of the airbag door portion 11 as the base end side goes to the base end from the locking hole 19. The front end side including a vertical surface portion 18 that is substantially perpendicular to the back surface of the instrument panel main body 3 is formed so that the inclined surface portion 16 is thinner than the vertical surface portion 18 and is fragile. Further, the inclined surface portion 16 extends downward from the upper end of the airbag of the airbag device 9 .

  An air bag device 9 is accommodated inside the chute portion 15 so that the chute portion 15 guides the expansion of the air bag when the air bag device 9 is activated. The airbag device 9 includes an airbag case 21 that houses an airbag and an inflator (not shown). The airbag case 21 is connected to and supported by an instrument panel reinforcement 23 extending in the vehicle width direction via a bracket 25. A hook 26 is fixed to the airbag case 21, and the hook 26 is inserted into the locking hole 19. When the airbag device 9 is operated, the hook 26 is caught on the periphery of the locking hole 19 so that the chute 15 does not pop out, as shown in FIG.

  The shooting port 17 of the chute 15 is covered with a reinforcing resin flap 27. The base end edge of the flap 27 is integrally connected to the upper end edge (opening edge portion of the shooting port 17) of the front side wall portion 15b via a hinge 29 that is curved in a substantially U shape. A gap S1 is formed between the leading edge of the flap 27 and the opening edge of the shooting port 17 (see FIG. 2). Further, a flange portion 33 protruding outward is integrally formed on the base end (end portion on the shooting port 17 side) of the chute portion 15 over the entire circumference.

  A plurality of vibration welding protrusions 31 extending in the vehicle width direction are integrally provided on the surface of the flap 27, and a plurality of vibration welding protrusions extending in the vehicle width direction are also provided on the surface of the flange portion 33. The strip 35 is integrally projected. The flap 27 is vibration welded to the back surface of the instrument panel main body 3 via the ridge 31, and the flange portion 33 corresponds to the outer peripheral edge portion of the airbag door portion 11 on the back surface of the instrument panel main body 3 via the ridge 35. Are joined by vibration welding.

  In the instrument panel 1 configured as described above, when the airbag of the airbag device 9 is inflated by the operation of the inflator at the time of a vehicle collision, the flap 27 and the airbag door portion 11 are pressed upward by the inflation pressure. While the planned break portion 7 breaks, the flap 27 rotates about the hinge 29, and the airbag door portion 11 is integrated with the flap 27 and opens upward in the front of the vehicle body. At this time, as shown in FIG. 4, the bulged airbag is guided along the inclined surface portion 16, and the bulging pressure is concentrated in the central portion of the airbag door portion 11. Moreover, the inflated airbag presses the inclined surface portion 16 outward to bend the inclined surface portion 16 in the direction of the arrow X in FIG. 4, and this pressing force acts on the outer peripheral edge of the airbag door portion 11. Therefore, the force which tears the fracture | rupture scheduled part 7 of the airbag door part 11 acts, it becomes easy to fracture | rupture, and the opening operation of the airbag door part 11 becomes more reliable.

  Further, when the head of the passenger in the passenger seat collides with the airbag door portion 11 from above as a result of sudden braking, the inclined surface portion 16 is bent and deformed so as to fall inward due to the impact load, as shown in FIG. This deformation operation absorbs and reduces the impact load. Further, since the impact load is absorbed and relaxed by the inclined surface portion 16, an excessive impact load is less likely to be applied to the planned fracture portion 7 of the airbag door portion 11, and therefore, the unexpected fracture of the planned fracture portion 7 is prevented. In addition, since the inclined surface portion 16 is formed to be more fragile than the vertical surface portion 18 and is more easily bent, the impact load is absorbed and relaxed more effectively compared to the case where the inclined surface portion 16 is formed to have the same strength as the vertical surface portion 18 and is scheduled to break. Unexpected breakage of the portion 7 can be prevented more reliably.

  According to the present embodiment, the outer peripheral edge of the airbag door 11 is reinforced by the flange 33, so that the inflation pressure of the airbag concentrates on the airbag door 11 and the airbag door 11 is more opened. Be certain. On the other hand, there is a problem that the head impact easily acts on the occupant due to the reinforcement, but the impact load is absorbed and relaxed by the inclined surface portion 16, and an adverse effect on the occupant protection by the reinforcement is suppressed.

(Embodiment 2)
6 and 7 show an instrument panel 1 with an airbag door portion according to Embodiment 2 of the present invention.

  In the second embodiment, the airbag door portion 11 is a double door type that includes a rear door portion 11a and a front door portion 11b and opens upward in the vehicle body front-rear direction. It is formed in a letter shape. Further, the flap 27 includes a rear flap 27a corresponding to the rear door portion 11a and a front flap 27b corresponding to the front door portion 11b, and the base end edge of the rear flap 27a is the rear side wall portion 15a. The base end edge of the front flap 27b is integrally connected to the upper end edge of the front side wall portion 15b via the hinge 29b while being integrally connected to the upper end edge via the hinge 29a. Since the other configuration is the same as that of the first embodiment, the same components are denoted by the same reference numerals, and detailed description thereof is omitted.

  According to the present embodiment, the bulging airbag is guided along the inclined surface portion 16 to the central portion of the airbag door portion 11 and the bulging pressure is concentrated on the tips of the flaps 27a and 27b. 27b is easy to open. Therefore, the opening operation of the airbag door portion 11 becomes more reliable.

(Embodiment 3)
FIG. 8 shows an instrument panel 1 with an airbag door portion according to Embodiment 3 of the present invention.

  In the third embodiment, the instrument panel main body 3 has a two-layer structure, and is constituted by integrally joining a skin 3a made of a flexible resin and a base material 3b made of a rigid resin. Further, a chute portion 15 is integrally projected on the back surface of the base material 3b, and a flap 27 of the airbag chute 13 is constituted by a part of the base material 3b.

  A groove portion 5 is formed in a U shape in a plan view along the rear side wall portion 15a and the left and right side wall portions 15c on the back surface of the base material 3b inside the shooting port 17, and the instrument panel body 3 corresponding to the groove portion 5 The fracture | rupture scheduled part 7 is comprised. Further, a groove 3c extending in the vehicle width direction along the front side wall portion 15b is formed on the surface of the base material 3b so as to connect both ends of the groove portion 5, and a part 3d of the skin 3a is fitted into the groove 3c. Yes. A portion of the base material 3b corresponding to the groove 3c is formed with a thin wall to constitute the hinge 29. Since the other configuration is the same as that of the first embodiment, the same components are denoted by the same reference numerals, and detailed description thereof is omitted.

  According to this embodiment, since the airbag chute 13 is molded simultaneously with the molding of the base material 3b, there is no need to weld the airbag chute 13 to the instrument panel body 3. Therefore, the manufacturing cost can be reduced.

  In the first to third embodiments, the inclined surface portion 16 is provided on the rear side wall portion 15a and the front side wall portion 15b of the chute portion 15; however, it may be provided only on the rear side wall portion 15a on the passenger side, or the rear side wall portion. 15a, the front side wall 15b, and the left and right side walls 15c may be provided.

  INDUSTRIAL APPLICABILITY The present invention is useful, for example, as an instrument panel with an airbag door having an airbag door that opens with the inflation pressure of the airbag and an airbag chute that guides the inflation of the airbag.

FIG. 3 is a perspective view showing a front part of the passenger seat of the instrument panel according to the first embodiment. It is sectional drawing in the AA of FIG. 1 is a perspective view of an airbag chute according to Embodiment 1. FIG. It is sectional drawing corresponding to FIG. 2 at the time of airbag expansion | swelling. It is sectional drawing of the left side part of FIG. 2 at the time of a passenger | crew's head colliding with an airbag door part from upper direction. FIG. 3 is a diagram corresponding to FIG. FIG. 3 is a diagram corresponding to FIG. 2 of the second embodiment. FIG. 9 is a diagram corresponding to FIG. 2 of Embodiment 3.

DESCRIPTION OF SYMBOLS 1 Instrument panel 3 Instrument panel main body 9 Airbag apparatus 11 Airbag door part 13 Airbag chute 15 Chute part 15a Rear side wall part (passenger side wall part)
16 Inclined surface portion 18 Vertical surface portion 19 Locking hole (locking portion)
33 Flange

Claims (3)

A substantially rectangular airbag door portion (11) that is opened by the inflation pressure of the airbag when the airbag device (9) is activated is partitioned and formed in the front part of the passenger seat of the instrument panel body (3) ,
Said instrument panel body (3) the air bag chute to surround the air bag door portion (11) on the back (13) is projected, the airbag chute (13), said air bag device (9) A locking portion (19) for locking is provided in the middle of the projecting direction, and the airbag device (9) is accommodated therein and guides the expansion of the airbag when the airbag device (9) is operated. An instrument panel with an airbag door provided with a rectangular tubular chute (15) ,
The chute part (15) protrudes from the outer periphery of the airbag door part (11),
At least on the occupant side wall (15a) of the chute (15) , an inclined surface (16) that inclines toward the inner side of the airbag door (11) as the base end goes to the base end from the locking portion (19 ). The front end side including the locking portion (19) constitutes a vertical surface portion (18) substantially perpendicular to the back surface of the instrument panel body (3) ,
The instrument panel with an airbag door portion, wherein the inclined surface portion (16) extends downward from an upper end of the airbag of the airbag device (9) . In the instrument panel with an airbag door part according to claim 1,
The instrument panel with an airbag door part, wherein the inclined surface part (16) is formed more fragile than the vertical surface part (18) . In the instrument panel with an airbag door part of Claim 1 or Claim 2,
The airbag chute (13) has a flange portion (33) integrally protruding outward from the base end of the chute portion (15) , and the flange portion (33) is formed by the instrument panel body (3 ) An instrument panel with an airbag door, wherein the instrument panel is bonded to the rear surface so as to correspond to the outer peripheral edge of the airbag door (11) .

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