JP5777057B2 - Air bag cover - Google Patents

Description

  The present invention relates to an airbag device for a passenger seat having an airbag door portion in which a door portion of an airbag device is provided on an interior member for a vehicle such as an instrument panel.

The airbag device for a passenger's seat receives an occupant and accommodates an airbag that relieves shock, an inflator that generates gas for inflating the airbag, and an airbag folded as a state before activation. It consists of a container part that supports the bag and the inflator in a connected state, and consists of a cover or the like that is appropriately made of resin, cloth, etc. according to the application.
In recent years, passenger-side airbags or so-called side airbags have been provided for safety improvement. In this case, airbags are installed inside synthetic resin interior members such as instrument panels and door trims. Thus, the air bag is inflated into the vehicle compartment from an air bag inflation outlet provided in the interior member. In general, the airbag inflation outlet is closed with a lid (airbag cover) having a thin portion that is easily broken when the airbag is inflated. Since the airbag cover can be opened so as to form a predetermined door when the airbag is inflated, the required physical properties such as flexibility and tensile strength are different from those of the instrument panel. For this reason, conventionally, an airbag cover is manufactured separately from an instrument panel made of a hard synthetic resin material or the like, and is covered with a screw or the like at the opening of the airbag inflation outlet.
As a conventional technique, in a vehicle interior member having an airbag door portion integrally or separately formed by injection molding using the same hard resin material as that of a main body portion, a tier portion thinner than a general thickness is provided in the airbag door portion. And a vehicle interior member having an airbag door portion formed along at least a part of the tear line with a thicker portion thicker than a general thickness on both sides or one side of the tear portion (see, for example, Patent Document 1) ) Exists.

Japanese Patent Laid-Open No. 11-301398 (see claims, detailed description of the invention, and FIGS. 1 to 21)

Patent document 1 which is the said prior art is provided with a protrusion part below the airbag facing surface of the planned door part, and presses the protrusion part to the inflating airbag to preferentially cleave the central fracture part. However, since the pressing force is applied to the lid itself in a shape close to a flat surface that is basically not deformed, the central fracture portion is forced to tear by the turning force of the planned door portion. Since the planned door portion is pressed with a flat surface, it is easy for force to be applied to the left and right fractures, and as a result, a state close to a so-called lift-up, where the entire planned door portion is lifted, may occur. There was a problem that the planned opening of the door was not performed smoothly.
An object of the present invention is to provide an airbag device for a passenger seat that solves the above problems.

A first invention of the present invention capable of solving the above-described problems is an airbag cover as set forth in claim 1 and is as follows.
An airbag cover that covers an airbag housed in a vehicle body and includes a planned door portion that is torn by the inflation force of the airbag, provided on the airbag facing surface of the planned door portion in the longitudinal direction of the vehicle comprising at least two or more groove-like cutouts, the from the air bag facing surface of the door portion to be along a rupture portion which cleaves in the vehicle width direction by the expansion force of the airbag so as to partially project downward It is the structure which is provided with the protrusion part provided in the part including the approximate center of the door plan part, and between the said thinning parts .

A second invention of the present invention capable of solving the above-described problems is an airbag cover as described in claim 2, and is as follows.
In addition to the invention described in claim 1, a soft resin is used for the inner part of the planned door portion.

A third invention of the present invention capable of solving the above-described problems is an airbag cover as described in claim 3, which is as follows.
In addition to the invention described in claim 1 or claim 2 , the fracture portion intersects with a central fracture portion provided in the vehicle width direction and both ends of the central fracture portion, and along the vehicle longitudinal direction. It is the structure provided with the provided left-right fracture | rupture part.

Since the airbag cover according to the present invention has the configuration as described above, the following effects are achieved.
(1) A protrusion projecting downward on the airbag facing surface of the planned door portion and at least two groove-shaped removals provided on the airbag facing surface of the planned door portion along the vehicle longitudinal direction. By providing the meat part , the central fracture part is cleaved prior to the right and left fracture parts when the airbag is deployed, and the planned door part can be rotated more smoothly.

The characteristic of the airbag cover of this invention is shown, (a) The front view at the time of seeing a lid from an inner side, (b) is the sectional view on the AA line of (a), (c) is (b) FIG. It is a schematic sectional drawing which shows the state which attached the airbag cover of this invention. It is explanatory drawing which shows the tearing operation | movement of the door plan part at the time of airbag deployment in the airbag cover of this invention, (a) The state before airbag deployment, (b) is the state of the initial stage of airbag deployment, (c ) Shows a state where the airbag is deployed to some extent from the airbag deployment state.

An airbag cover that covers an airbag housed in a vehicle body and includes a planned door portion that is torn by the inflation force of the airbag, provided on the airbag facing surface of the planned door portion in the longitudinal direction of the vehicle comprising at least two or more groove-like cutouts, the from the air bag facing surface of the door portion to be along a rupture portion which cleaves in the vehicle width direction by the expansion force of the airbag so as to partially project downward This is an airbag cover that includes a part including the approximate center of the planned door portion and a protrusion provided between the thinning portions.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
As can be understood from FIGS. 1 and 2, the airbag device for a passenger seat according to the present invention includes an airbag 10, a retainer 11, an inflator 12, and a lid 1, and the lid 1 is made of polypropylene or the like. An outer 2 made of a hard resin and an inner 3 made of a soft resin such as an olefin elastomer are welded and formed by vibration welding or the like.
The outer 2 is formed with a tear line 9 having a locally reduced thickness so that the lid 1 can be smoothly cleaved when the airbag is deployed. In the present embodiment, the tear line 9 is processed after molding to improve the appearance. However, the tear line 9 may be formed at the time of molding as long as the appearance is not affected.
The inner 3 has a length required when the planned door 13 rotates so that the planned door 13 provided on the outer 2 can be opened smoothly without being lifted up when the airbag is deployed. The hinge 5 and the outer rib 2 are provided with welding ribs 6 for welding.
The hinge 5 is divided into a plurality at equal intervals. Between the hinge 5 and the hinge 5, at least two or more groove-like thinned portions 4 obtained by removing the flesh from the general thick portion of the inner 3 are provided in the vehicle. It is set along the front-rear direction.
Further, a convex shape 8 is set between the approximate door center 13 and between the thinning portions 4. The convex shape 8 is formed in a hollow shape in order to improve moldability and to be easily deformed by receiving the pressing force of the airbag when in contact with the inflating airbag, and is welded to be completely fixed to the lid 1. The ribs 6 are provided in a lattice shape.
In addition, the rib 6 provided in the convex shape 8 is not a lattice shape, and is provided only along the vehicle front-rear direction. Further, if the welding strength between the inner 3 and the outer 2 is maintained, the rib 6 does not necessarily have to be provided in the hollow shape of the convex shape 8.
In this embodiment, the convex shape 8 is provided in the vicinity of the center of the tear line 9 so as not to have a large width. This is because if the convex shape 8 is provided long in the vehicle width direction, the tensile force generated in the central tear line 9 becomes weak.

Here, the operation | movement at the time of expansion | deployment of the airbag cover of this invention is demonstrated based on FIG.
When the airbag is deployed, the airbag 10 that has started to inflate when the gas is ejected first presses the portion of the convex shape 8 provided in the lid 1 at the beginning of the airbag deployment. By pressing the convex shape 8 provided at the approximate center of the planned door portion, the lid 1 is intensively applied to the approximate center portion of the lid 1 before the pressing force of the airbag 10 is applied to the entire plane. Come to join. Furthermore, the effect of the thinning portion 4 provided on the inner 3 along the vehicle front-rear direction promotes swell along the vehicle width direction with the substantially central portion of the lid 1 as the top, and the planned door portion 13 Deforms into a dome shape toward the outside.
This is not to forcefully tear the tear line 9 at the center of the outer 2 by only pressing the convex shape 8 to rotate the lid 1, but rather to force the lid 1 including the tear line 9 to be approximately at the center. The first part is raised and the tensile force is applied to the tear line 9 by the force to rotate the lid 1 from a state in which the load is applied to the tear line 9 which is a weak part in advance, so that the tear line can be first broken. The central tear line 9 can be preferentially cleaved by the pressing force caused by the subsequent inflation of the airbag 10 (not shown).
Further, since the hinge 5 is divided into a plurality of parts and the thinned portion 4 is set between the hinges 5, the deformation to the dome shape is further assisted.
Further, the thinning portion 4 is provided only on the flat portion of the inner 3 between the hinges 5, but the groove-like thinning portion 4 is provided along the front-rear direction on the hollow convex shape 8 itself. By doing so, the deformation to the dome shape is further assisted.
As a result, a tearing stress is applied to the center of the tear line 9 at the center of the door, and the tear line 9 of the door is smoothly opened, so that the airbag 10 can be smoothly deployed.

In addition, although the Example shown above is a door shape of what is called a double door (a cleavage part is substantially H shape), even if it is a door shape of a single opening (a cleavage part is substantially U shape), It goes without saying that features are played.
Moreover, although the protrusion part of the said Example is a hollow thing, what was shape | molded thickly and what was filled with soft resin in the hollow part may be sufficient.

  It can be used for airbag devices of all types of vehicles.

DESCRIPTION OF SYMBOLS 1 ... Lid 2 ... Outer 3 ... Inner 4 ... Thinning part 5 ... Hinge 6 ... Rib 8 ... Convex shape 9 ... Tearline 10 ... Airbag 11 ... Retainer 12 ... Inflator 13 ... Door planned part

Claims (3)

An airbag cover that covers an airbag housed in a vehicle body and includes a planned door portion that is torn by the inflation force of the airbag, provided on the airbag facing surface of the planned door portion in the longitudinal direction of the vehicle comprising at least two or more groove-like cutouts, the from the air bag facing surface of the door portion to be along a rupture portion which cleaves in the vehicle width direction by the expansion force of the airbag so as to partially project downward An airbag cover comprising a protruding portion provided between a portion of the planned door portion including substantially the center and between the thinning portions. The airbag cover according to claim 1, wherein a soft resin is used for an inner portion of the planned door portion. The rupture portion includes a central rupture portion provided in a vehicle width direction, and a left and right rupture portion that intersects with both ends of the central rupture portion and is provided along a vehicle front-rear direction. The airbag device for a passenger seat according to claim 1 or claim 2 .

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