JP2010023620A - Cover body of airbag device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the occurrence of gloss spots while reducing vibration-welding costs, besides preventing an outer door scheduled section (a door section) from causing a peeling phenomenon relative to an inner door reinforcing section (a plate section) upon expansion of an airbag without taking a measure for densifying a weld rib (a weld protrusion). <P>SOLUTION: In this metal arm member, the weld rib 8 formed in a joint surface to the outer door planned section 51b in the inner door reinforcing section 52a, consists of a first weld rib 8a protrudingly formed to be extended in the horizontal direction of an automobile, and a second weld rib 8b protrudingly formed to cross the first weld rib 8a and to spread mutually radially toward a center tear line 51-1a from an edge side in the longitudinal direction of the automobile opposed to the center tear line 51-1a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cover body for an airbag device of a vehicle that covers a bulging side of a stored airbag and is formed with a protruding opening through which the bulging airbag projects.

  2. Description of the Related Art Conventionally, an airbag device for a passenger in a passenger seat, for example, disposed on an instrument panel of a vehicle is known as an airbag device for a vehicle such as an automobile.

  Such an airbag device includes a box-shaped case body, in which a folded airbag and an inflator for injecting a gas for inflating the airbag are housed, and an upper side of the case body is accommodated. The opening is configured by being covered with a cover body attached along the instrument panel.

  The cover body is formed with a tearable tear line such as a substantially H-shape in plan view, a “day” shape, or a C-shape, and a portion surrounded by the tear line is defined as a planned door portion covering the opening. ing.

  In the event of a car collision, the air bag is inflated by injecting gas from the inflator, the tear line is broken by the inflation pressure of the airbag to form the door part by the planned door part, and the part where the tear line is not formed is used as a hinge The door portion is deployed to form a projecting opening, and the airbag is inflated and deployed from the projecting opening to alleviate the impact applied to the occupant.

As a cover body of an automobile airbag device having such a structure, a structure in which the cover body is integrally formed on an instrument panel is known for the purpose of improving the appearance (for example, Patent Document 1 or Patent). Reference 2)
JP 2004-136698 A JP 2007-91026 A

  According to the vehicle airbag door (cover body) disclosed in Patent Document 1, the door portion (outer door planned portion) is formed by the planned break portion (tea line) provided on the back side of the panel body (outer portion) of the instrument. The door portion is opened by the operation of an airbag device disposed on the back side of the panel body. On the back side of the panel body, a reinforcing plate portion welded to the back side surface of the door portion An (inner door reinforcing portion), a frame body portion that supports the airbag device, and a mounting bracket (inner portion) including a hinge portion that connects the frame body portion and the plate portion are arranged.

  The door portion on the panel body side and the plate portion on the mounting bracket side are welded and joined to each other by vibration welding.

  For this purpose, grid-like welding projections (welding ribs) extending in the front-rear and left-right directions of the vehicle are formed in advance on the joint surface of the plate portion, and the welding projections are melted by vibration welding. Thus, the so-called seamless cover body (or seamless instrument panel) is formed by joining the door portion on the panel body side and the plate portion on the mounting bracket side to each other.

  The formation of the welding projections in a lattice shape is intended to increase the welding force of the plate portion with respect to the door portion by intersecting the amplitude direction of the vibration welding machine in parallel and at a right angle.

  By the way, in such a configuration, at the time of the collision of the automobile, the airbag is inflated, the expected breakage portion is broken by the inflation pressure, the door portion is developed together with the plate portion, and a protruding port is formed through which the airbag is inflated. Will be.

  Then, in the initial stage of gas introduction, the door portion is deformed so that the rupture start position is at the rupture start position at the center of the door, and the rupture of the planned rupture portion starts from the rupture start position. Proceeding toward the outer side, formed so that both ends of the central fractured portion intersect after the full length of the central fractured portion (central tear line) in the vehicle left-right central portion of the door at the planned fractured portion The left and right broken parts (outline section tear line) are broken, and the door part is developed together with the plate part around the hinge part.

  As a result, the propagation direction of the gas pressure in the door portion has a ripple shape centering on the break start position in the central portion, and develops in a form intersecting the welding projections formed in a lattice shape.

  By the way, in the so-called seamless instrument panel, the plate portion is usually made of a relatively hard resin, for example, an injection molded product of polypropylene resin, including the door portion, whereas the plate portion is made of a relatively soft elastomeric resin, for example, It is composed of TPO (Thermoplastic Olefin) injection molded products.

  Therefore, joining by vibration welding is performed by welding and joining a soft plate part to a hard door part.

  Therefore, when the gas pressure is propagated in a ripple pattern to expand the door portion, the welded shape of the welded door portion and the plate portion is melted by the lattice-like welding projections, so that the gas pressure Since the contact strength is weakened and the door portion is hard, it may be warped alone and peeled from the plate portion.

  On the other hand, in the prior art disclosed in Patent Document 2, a plurality of first ribs that extend with the welding ribs (welding protrusions) inclined with respect to the vibration direction of vibration welding are symmetrical to the first ribs with respect to the vibration direction. The plurality of second ribs extending in an inclined manner are formed in a lattice shape so as to cross each other.

  Such a configuration is intended to concentrate and heat the frictional heat generated by vibration welding at the intersection between the first rib and the second rib.

  And when a door part expand | deploys by the expansion | swelling of an airbag, the 1st rib and the 2nd rib are extended along the propagation direction of the gas pressure in a door part, These both ribs Will act as a reinforcing rib, so that the door part can be prevented from warping independently of the plate part, and the peeling phenomenon from the plate part can be suppressed.

  On the other hand, since the first rib and the second rib extend in a direction inclined with respect to the vibration direction, the vibration welding energy is transmitted to the portion excluding the intersecting portion in the first rib and the second rib. It is difficult to weaken the welding force between the door portion and the plate portion. From this point, it is considered that a peeling phenomenon occurs due to the rise of the door portion with respect to the plate portion.

  Therefore, conventionally, in order to prevent the peeling phenomenon between the door part and the plate part, the vibration welding force between the door part and the plate part in any of the techniques described in Patent Document 1 or Patent Document 2. In order to increase the thickness, measures are taken to form the formation density of the welding ribs (welding projections) densely.

  However, as a result of increasing the formation density of the welding ribs (welding protrusions), high vibration energy is required for vibration welding for joining the door portion and the plate portion, which increases the size of the vibration welding machine. This will be a cause of high costs.

  In addition, as a result of taking measures to increase the adhesion strength by increasing the density of the welding ribs, for example, when the surface of the instrument panel including the door part is aesthetically creased, etc., the door part has a high degree of adhesion of the plate part. The above-mentioned wrinkle pattern on the surface side is crushed, and the instrument panel generates gloss spots on the surface, which causes a poor appearance.

  Therefore, the present invention does not take measures for increasing the density of the welding ribs (welding protrusions), and the outer door planned portion (door portion) is the airbag bulging portion with respect to the inner door reinforcing portion (plate portion). An object of the present invention is to provide a cover body for an automobile airbag device that prevents the occurrence of gloss spots while reducing vibration welding costs.

  A cover body of a vehicle airbag device according to the present invention covers a bulging side of a stored airbag and has a projecting opening through which the bulging airbag projects. The cover body is composed of an outer part and an inner part joined by melting a welding rib by vibration welding, and the outer part is an outer door planned part arranged on the bulging side of the airbag And an outer shell portion surrounding the planned outer door portion, and the outer shell portion and the planned outer door portion are partitioned by an outline partition tear line, and the outer portion includes both ends. An initial tear tear line that is cross-connected to the outline section tear line is formed, and the inner portion is an inner door reinforcing portion joined to the planned outer door portion, An inner outer part joined to the outer outer part, and a deformable hinge part for connecting the inner door reinforcing part and the inner outer reinforcing part, and further, the inner door reinforcing part in the inner door reinforcing part A welding rib is formed on one side of the inner door reinforcing portion and the outer door planned portion on the joint surface with the planned outer door portion so as to protrude toward the other side of the inner door reinforcing portion and the outer door planned portion. A first welding rib projecting so as to extend in the left-right direction of the vehicle, and a vehicle front-rear direction end that intersects the first welding rib and faces the initial tear tear line. The second welding rib is formed so as to project radially from the side toward the initial cleavage tear line.

  In addition, the initial tear tear line in the present invention may be configured by a central tear line that divides an intermediate portion of the planned outer door portion in the front-rear direction of the vehicle.

  According to the present invention configured as described above, the inner door reinforcing portion and the outer door planned portion are disposed on one side of the inner door reinforcing portion and the outer door planned portion on the joint surface of the inner door reinforcing portion with the planned outer door portion. The welding rib formed so as to protrude toward the other side intersects the first welding rib and is formed so as to extend in the left-right direction of the vehicle, and faces the initial tear tear line. The inner door reinforcing portion and the outer door planned portion are composed of the second welding ribs that project from the vehicle longitudinal direction edge toward the initial tear tear line so as to expand radially. The first welding rib of the welding rib extending in the left-right direction of the vehicle extends in parallel with the amplitude direction of the vibration welding machine, thereby being bonded with high welding strength. When the outer door planned portion is deployed together with the inner door reinforcing portion due to the bulge of the airbag, the welded portion formed by the second weld rib extends substantially along the gas pressure propagation direction in the outer door planned portion. As a result, it can act as a reinforcing rib for the planned outer door part, preventing the planned outer door part from warping independently with respect to the inner door reinforcing part. The peeling phenomenon can be suppressed. As a result, it is not necessary to increase the size of the vibration welding machine, which contributes to cost reduction and can eliminate the occurrence of glossy spots on the surface of the outer door planned portion.

  Next, embodiments according to the present invention will be described with reference to the drawings.

  FIG. 1 is a bottom view showing an embodiment of a cover body of an airbag device of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG.

  The airbag apparatus 1 shown in the figure shows a case where the airbag apparatus 1 is applied as, for example, an assistant airbag for an automobile, which is a vehicle. A windshield (not shown) is positioned above the instrument panel portion 2 so as to face the passenger in the passenger seat inside the provided instrument panel portion 2.

  The airbag device 1 includes a case body that is a member to be attached, an inflator (not shown) stored in a lower portion of the case body 3, a bag-like airbag stored in a folded state on the upper portion of the case body 3, And a cover body 5 that covers the opening of the upper portion of the case body 3, and the case body 3 is attached to a member on the vehicle body side via a bracket (not shown) so as to be attached to the vehicle body. ing.

  Further, the upper portion and the lower portion of the case body 3 are partitioned by a mid retainer (not shown) provided with a gas jet port that communicates vertically, and the airbag 4 is accommodated above the mid retainer. On the lower side, for example, a cylindrical inflator is accommodated.

  A hook 3 a having a substantially C-shaped cross section as an attachment portion is attached to the front surface and the rear surface of the upper portion of the case body 3.

  With such a configuration, when the automobile is impacted by a collision or the like, the airbag device 1 is inflated by the gas supplied from the inflator, and the cover body 5 is broken by the inflation pressure. 3 is formed, and the airbag 4 protrudes in a predetermined direction X (normally upward of the automobile) on the bulging side, inflates and deploys in front of the occupant, and exhibits an occupant capturing function.

  In the following description, the opposite side to the inflation side of the airbag 4 will be described as the lower side or the back side, and the windshield side when the airbag device 1 is attached to the automobile will be the front side (FIG. 3). The arrow F direction) and the occupant side are the rear (arrow Y direction shown in FIG. 3). It can also be attached to the car body.

  The cover body 5 in which the projecting opening 7 is formed when the airbag 4 is inflated includes an outer part 51 constituting a part of the instrument panel part 2 and an inner part 52 attached to the back side of the outer part 51 by vibration welding. And constitutes a member called a so-called seamless instrument panel or the like that is integrally configured as the instrument panel portion 2.

  The outer portion 51 integrally covers the surface side of the instrument panel portion 2 and is exposed to the outside. That is, it constitutes a part of the instrument panel portion 2 provided in a substantially plate shape over the substantially entire length in the vehicle width direction at the front portion of the passenger compartment, and is composed of, for example, an injection-molded product made of polypropylene resin. And is attached to the vehicle body using a mounting tool such as a clip or a screw (not shown).

  Furthermore, a tear line 51-1 which is a weak portion as a planned door line portion is formed on the back surface side of the outer portion 51 so as to be substantially opposed to the upper opening portion of the case body 3, and the outer outline which is a non-deployed portion. A pair of planar rectangular outer door planned portions 51b and 51b surrounded by the portion 51a and the outer shell portion 51a are partitioned. The outer door planned portions 51b and 51b cover the bulging side of the airbag 4 accommodated in the case body 3 in a folded state in a normal state.

  The tear line 51-1 has an outer outer wall in the outer door planned portions 51 b and 51 b by intersecting the central tear line 51-1 a that divides the planned outer door portions 51 b and 51 b in the middle in the vehicle front-rear direction and the both ends of the central tear line 51-1 a intersect. An outline section tear line 51-1b that forms an outline with the portion 51a is formed in a square frame shape that is a closed loop shape of a “Japanese” character in a Chinese character in plan view. However, it is not limited to such a shape. For example, it may be formed in an “H” shape or a “U” shape in plan view.

  The tear line 51-1 may be formed as a thin portion by a concave groove engraved by post-processing with a milling blade or the like on the flat portion after the outer portion 51 is molded. You may make it form by forming.

  The inner part 52 is an injection-molded product of a resin material softer than the resin material constituting the outer part 51, for example, an elastomeric resin such as TPO resin (thermoplastic olefin). The inner part 52 includes a pair of planned outer door parts 51b and 51b. It has a planar shape larger than the combined shape, and is welded to the outer portion 51 so as to be positioned inside and outside the outline division tear line 51-1b of the tear line 51-1.

  More specifically, the inner portion 52 includes a pair of inner door reinforcing portions 52a and 52a in the front-rear direction of the automobile which is coupled to the back surface of the outer door planned portion 51b of the outer portion 51 and has a substantially rectangular shape. A rectangular frame-shaped inner outer portion 52b coupled to the portion 51a is provided, and the inner door reinforcing portions 52a, 52a and the inner outer portion 52b are connected by a hinge portion 52c.

  And the inner door reinforcement parts 52a and 52a and the inner shell part 52b are divided by the slit-shaped inner cutting part 52-1.

  That is, as with the tear line 51-1, the inner cutting part 52-1 has a central cutting part 52-1a that partitions the inner door reinforcing parts 52a, 52a in the middle in the vehicle front-rear direction, and both ends of the central cutting part 52-1a. Intersecting the inner door reinforcement portions 52a and 52a and the side cutting portion 52-1b constituting the outer shell 51b in a square frame shape that is a closed loop shape of a “Japanese” character in a plan view. Is formed. However, it is not limited to such a shape. For example, it may be formed in an “H” shape or a “U” shape in plan view.

  Since the inner part 52 is made of a soft resin, the inner cutting part 52-1 is preferably formed by forming a notch groove at the same time when the inner part 52 is injected.

  According to the present embodiment, the inner portion 52 is formed by integrally forming the pair of inner door reinforcing portions 52a, 52a, the inner shell portion 52b, and the hinge portion 52c, but is not limited thereto. For example, the inner door reinforcing portions 52a and 52a and the inner outer portion 52b which are separately configured may be connected to each other by attaching the separate hinge portion using a fixing means such as a screw. .

  On the upper surface, which is a joint surface between the inner door reinforcing portion 52a and the inner shell portion 52b, a welding rib 8 made of a projection having a triangular cross section or a quadrangular cross section, which is clearly shown in FIG. 1, is provided. It protrudes toward the part 51a. In FIG. 1, the welding rib 8 is drawn with a solid line, but this is shown with a solid line for the sake of clarity and emphasis.

  In addition, the welding rib 8 is formed on the upper surface, which is a joint surface between the inner door reinforcing portion 52a and the inner outer portion 52b, and the inner door reinforcement on the lower surface, which is a joint surface between the outer door planned portion 51b and the outer outer portion 51a. It may be formed so as to protrude toward the portion 52a and the inner outer portion 52b, and an upper surface that is a joint surface of the inner outer portion 52b to the inner door reinforcing portions 52a and 52a, and an outer outer portion to the outer door planned portion 51b You may make it project and form in both the lower surfaces which are the joint surfaces of 51a.

  The welding ribs 8 are a plurality of first welding ribs 8a formed so as to protrude in the left-right direction of the automobile, and the front and rear of the automobile that intersect the first welding ribs 8a and face the central tear line 51-1a. Both ends in the direction (sides of the inner door reinforcing portion 52a on the hinge portion side as the rotation center when the airbag 4 is inflated) from the substantially central portion toward the central tear line 51-1a so as to expand radially. And a plurality of second welding ribs 8b formed to protrude.

  Therefore, the welding rib 8 is melted by vibrating the joint surfaces of the inner door reinforcing part 52a together with the inner outer part 52b and the outer outer part 51a together with the planned outer door part 51b using a vibration welding machine. Thus, the inner part 52 and the outer part 51 can be welded.

  The welded joint between the inner part 52 and the outer part has a left and right welded part extending in the left and right direction of the vehicle by the first welded rib 8a and a left and right welded part by the second welded rib 8b. And a radially welded portion that radially expands toward the central tear line 51-1a from the substantially central portion of the both ends in the vehicle front-rear direction facing the central tear line 51-1a. .

  When gas is supplied to the airbag 4, the airbag 4 inflates and expands in the case body 3, that is, presses the pair of inner door reinforcing portions 52 a and 52 a in the vehicle front-rear direction of the inner portion 52 by the pressure of the inflation. Thus, the pair of planned outer door portions 51b and 51b in the vehicle front-rear direction of the outer portion 51 is pushed up via the inner door reinforcing portions 52a and 52a. And by this pushing-up force, as shown in FIG. 3, the center tear line 51-1a of the tear line 51-1 of the outer part 51 is first cleaved as the initial tear tear line, and further, the outline section tear line extending in the longitudinal direction of the automobile. As a result, the outer door planned portions 51b and 51b are opened and deployed as door portions by the hinge portion 52c, and the protruding port 7 through which the airbag 4 bulges is formed.

  The inner door reinforcing part 52a together with the inner outer part 52b, and the outer door planned part 51b together with the outer outer part 51a, the first welding rib 8a extending in the left-right direction of the vehicle among the welding ribs 8 is a vibration welding machine. When the outer door planned portion 51b is deployed together with the inner door reinforcing portion 52a by the bulging of the airbag 4 after the joining, the joining is performed with the high welding strength by extending parallel to the amplitude direction of the air bag 4. The weld portion formed by the second weld rib 8b extends substantially along the gas pressure propagation direction (ripple shape) in the planned outer door portion 51b, so that the center tear line is formed as shown in FIG. The center portion of 51-1a is deformed so as to become a break start position and rise from the center portion, and as shown by an arrow I, the center tear line 51-1a toward the left-right direction of the automobile After the breakage proceeds and the entire length of the central tear line 51-1a breaks, the outline section tear line 51-1b breaks as shown by the arrow II, and further the break of the tear line 51-1 progresses as shown by the arrow III. The inner door reinforcement portions 52a and 52a and the outer door planned portion 51b are developed in the front-rear direction of the vehicle in a well-balanced manner by the action of the welding rib 8.

  That is, it intersects the first welding rib 8a extending in the left-right direction of the automobile and faces both ends of the vehicle in the front-rear direction facing the central tear line 51-1a (side on the hinge side when the inner door reinforcing portion 52a is rotated). The second welding ribs 8b provided so as to radially expand from the substantially central portion toward the central tear line 51-a can serve as reinforcing ribs for the outer door planned portion 51b, and the outer door planned portion 51b serves as the inner door. It is possible to prevent the door reinforcing portion 52a from warping independently, and to suppress the peeling phenomenon from the inner door reinforcing portion 52a, and as a result, the welding ribs 8 are formed with high density. There is no need to increase the size of the vibration welding machine, which contributes to cost reduction, and it is possible to prevent gloss spots on the surface of the outer door planned portion 51b.

  FIG. 4 is a bottom view showing another embodiment of the cover body of the airbag apparatus similar to FIG. 1 depicting another embodiment according to the present invention.

  In the other embodiment shown in FIG. 4, among the weld ribs 8, the first weld rib 8a is formed on the entire joint surface of the inner door reinforcement portion together with the inner outer portion 52b, as in the first embodiment. Although formed, the second weld rib 8b is formed only around each corner of the rectangular inner door reinforcing portion 52a and is not formed in the center. In FIG. 4, as in FIG. 1, the welding rib 8 is drawn with a solid line, but this is shown with a solid line for the sake of clarity and emphasis.

  With this configuration, when the airbag 4 is inflated, the second weld rib 8b is present in a portion where the inner door reinforcing portion 52a is likely to bend in the planned outer door portion 51b. Compared to the first embodiment, the welding energy of the vibration welding machine for welding and joining the outer portion 51 and the inner portion 52 is reduced.

  In the above embodiment, as shown in FIG. 3, the outer door planned portion 51b together with the inner door reinforcing portion 52a is first cleaved by the central tear line 51-1a. For example, when the tear line 51-1 is formed in a U-shape as a modification, the outer door planned portion 51b has a single configuration, and the U-shaped tear line 51- 1 is composed of a pair of longitudinal tear lines extending in the longitudinal direction of the vehicle and lateral tear lines extending in the lateral direction of the vehicle and formed so that both longitudinal ends thereof intersect each other. This lateral tear line constitutes the initial tear tear line.

  When configured in this way, the second welding rib 8b has both ends in the front-rear direction of the automobile facing the lateral tear line that is the initial tear tear line (as the center of opening when the airbag 4 is inflated in the inner door reinforcing portion 52a). The inner door reinforcing portion 52a is formed so as to expand radially from the center portion of the side (side on the hinge portion side) toward the lateral tear line.

  Also in this modification, the welding rib 8 may be formed on the outer portion 51 side.

  FIG. 5 shows still another embodiment according to the present invention. The still another embodiment is a cover body in which a pair of inflators for inflating and deploying the airbag 4 are juxtaposed in the left-right direction of the automobile. The structure of is shown. In FIG. 4, as in FIG. 1, the welding rib 8 is drawn with a solid line, but this is shown with a solid line for the sake of clarity and emphasis.

  According to still another embodiment shown in FIG. 5, a pair of inflators (not shown) are arranged below the inner door reinforcing portions 52a and 52a (front side of one side of the paper) arranged so as to face the vehicle front-rear direction. The inner door reinforcing portions 52a and 52a are arranged on both the left and right sides of the vehicle with the center line in the left and right direction of the vehicle interposed therebetween.

  As a result, when gas is ejected from the pair of inflators, each inner door reinforcing portion 52a, 52a is caused to be the outer door planned portion 51b from the central portion between the vehicle lateral center line and the vehicle left and right edges by gas pressure. , 51b rises and propagates outward in the lateral direction of the vehicle in the center tear line 51-a. Therefore, the first welding rib 8a of the welding rib 8 is the same as that of the above-described embodiment. The second welding rib 8b is extended in the direction, and both ends in the vehicle front-rear direction facing the respective central parts between the vehicle left-right direction center line of the center tear line 51-1a and the vehicle left-right ends. From substantially each center part, it is provided so that it may spread radially toward the center tear line 51-1a.

  Other configurations are the same as those in the above embodiment.

  In still another embodiment having such a configuration, the second welding rib 8b intersects the first welding rib 8a extending in the left-right direction of the automobile and the center of the center tear line 51-1a in the left-right direction of the automobile. Because it is provided so as to expand radially from each other toward the central tear line 51-1a from the substantially central part of each of the both ends of the vehicle in the front-rear direction facing the central part between the line and the left and right sides of the vehicle, Similar to the above embodiment, the outer door planned portion 51b can act as a reinforcing rib, and the outer door planned portion 51b can be prevented from warping independently with respect to the inner door reinforcing portion 52a. Peeling phenomenon with the reinforcing portion 52a can be suppressed, and as a result, it is not necessary to increase the size of the vibration welding machine by forming the welding ribs 8 with high density, thereby reducing cost. With Azukasuru, it is possible to prevent the gloss unevenness or the like in the surface of the outer door scheduled portion 51b.

  As described above, according to the present invention, the inner door reinforcing portion has high welding strength by the first welding rib extending in the left-right direction of the vehicle extending in parallel with the amplitude direction of the vibration welding machine. When the outer door planned portion is expanded together with the inner door reinforcing portion, the welded portion shape formed by the second weld rib is the gas pressure propagation direction in the outer door planned portion. The inner door reinforcing portion can be prevented from independently bending against the inner door reinforcing portion by acting as a reinforcing rib for the planned outer door portion. As a result, it is not necessary to increase the size of the vibration welding machine, which contributes to cost reduction and is expected to improve aesthetics without causing glossy spots on the surface of the planned outer door. Can you do Covers the bulging side of the accommodated airbag, is suitable as a cover or the like of an airbag device for a vehicle projecting opening of the airbag protrudes that bulges are formed.

It is a bottom view which shows one Embodiment of the cover body of the airbag apparatus of this invention. It is AA sectional drawing of FIG. It is explanatory drawing which shows the operation | movement of the fracture | rupture start initial stage of a cover body same as the above. It is a bottom view which shows other embodiment of the cover body of the airbag apparatus of this invention. It is a bottom view which shows other embodiment of the cover body of the airbag apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airbag apparatus 2 Instrument panel part 3 Case body 4 Airbag 5 Cover body 51 Outer part 51a Outer outer part 51b Outer door planned part 51-1 tear line 51-1a Central tear line 51-1b Outline division tear line 52 Inner part 52a Inner Door reinforcing portion 52-1 Inner cutting portion 52-1a Central cutting portion 52-1b Side cutting portion 7 Protruding port 8 Welding rib 8a First welding rib 8b Second welding rib

Claims (2)

A cover body of a vehicle airbag device in which a protruding port from which the airbag that bulges is formed is formed while covering the bulging side of the stored airbag.
The cover body is composed of an outer part and an inner part joined by melting the welding rib by vibration welding,
The outer portion is configured to include an outer door planned portion disposed on the inflation side of the airbag and an outer outer portion surrounding the outer door planned portion, and the outer outer portion and the outer door planned portion. Is defined by an outline section tear line, and the outer section is formed with an initial cleavage tear line whose both ends are cross-connected to the outline section tear line,
Further, the inner portion is deformable to connect the inner door reinforcing portion joined to the outer door planned portion, the inner outer portion joined to the outer outer portion, the inner door reinforcing portion and the inner outer portion. And a hinge part,
Furthermore, in the joint surface of the inner door reinforcing portion with the planned outer door portion, on one side of the inner door reinforcing portion and the planned outer door portion, toward the other side of the inner door reinforcing portion and the planned outer door portion. The welding rib is formed so as to protrude in the horizontal direction, and the welding rib intersects the first welding rib and the first welding rib that is formed so as to extend in the left-right direction of the vehicle and the initial stage. A vehicle airbag device comprising: a second welding rib projecting so as to radially expand from an end in a vehicle longitudinal direction facing a tear tear line toward the initial tear tear line. Cover body. 2. The vehicle airbag device cover body according to claim 1, wherein the initial tear tear line is configured by a central tear line that divides a middle of the outer door planned portion in the front-rear direction of the vehicle.