JP6806015B2 - Interior parts for airbag mounting and their manufacturing methods - Google Patents

Description

The present invention relates to an airbag mounting interior product and a method for manufacturing the same.

Conventionally, an airbag mounting interior product used in a vehicle airbag device or the like is known (for example, Patent Document 1). This airbag mounting interior is provided with a frame-shaped retainer to which a case having a storage space for containing the airbag is mounted, and an instrument panel to which the retainer is mounted. The retainer is provided with a rib protruding toward the instrument panel side. Further, the panel body of the instrument panel is provided with ribs protruding toward the retainer side. Then, the retainer and the instrument panel are integrated by joining the ribs by vibration welding.

Japanese Unexamined Patent Publication No. 2012-245859

By the way, in the welding of ribs between the retainer side and the instrument panel side, it is necessary to pressurize the welded end faces of both ribs through a jig. However, in a structure in which the wall portion where the rib is provided in each of the retainer and the instrument panel is inclined with respect to the pressurizing direction, the welded end surface of the rib is formed parallel to the wall portion of the retainer or the instrument panel. Assuming that the ribs are inclined with respect to the pressurizing direction, the welded end faces of the ribs are not pressurized in the direction perpendicular to the welded end faces. For this reason, in this structure, a large pressing force does not act on the welded end face and the welding cannot be performed properly, or a force generated by the jig is made larger so that a large pressing force acts on the welded end face. It is necessary to do.

The present invention has been made in view of such a point, and provides an airbag mounting interior product capable of efficiently pressurizing and welding the ribs of a retainer and an instrument panel, and a method for manufacturing the same. The purpose is to do.

In the present invention, a retainer having a case for accommodating an airbag and having a first wall portion arranged on the deployment side with respect to the airbag, and the airbag with respect to the first wall portion of the retainer. An airbag mounting interior product comprising a second wall portion arranged to face the deployment side of the airbag and a panel welded to the retainer, wherein the first wall portion and the second wall portion are provided. Each has an inclined surface that is inclined with respect to a pressurizing direction in which the retainer and the panel are relatively moved during assembly for welding, and the retainer is the panel from the inclined surface of the first wall portion. The first rib has a first rib protruding toward the side along the pressurizing direction, and the panel projects from the inclined surface of the second wall portion toward the retainer side along the pressurizing direction. The first rib and the second rib are interior products for airbag mounting, each having a second rib welded to the airbag, and each of the first rib and the second rib has a welded end surface whose directions facing each other in parallel correspond to the pressurizing direction. ..

According to this configuration, the retainer is provided with a first rib that protrudes from the inclined surface toward the panel side in the pressurizing direction, and the panel has a second rib that projects from the inclined surface toward the retainer side along the pressurizing direction. Ribs are provided. Each of the first rib and the second rib has a welded end surface whose parallel facing direction coincides with the pressing direction for assembling the retainer and the panel. In such a structure, even the ribs formed on the inclined surfaces of the retainer and the panel are pressurized along the facing direction with the welded end faces facing each other in parallel. Therefore, the ribs of the retainer and the panel can be efficiently pressurized and welded to each other.

The present invention supplies an expansion gas to a retainer having a lid composed of two flaps, a case attached to the retainer, an airbag housed in a space defined by the retainer and the case, and the airbag. It has an inflator and an opening including two doors located on the rear side of the flap and consisting of a tierline defined region located at a position corresponding to the boundary of the flap and welded to the flap. This is an interior product for mounting an airbag, which is composed of a panel and a front surface of the panel of the opening portion defined by the tear line, and faces forward along a pressing direction during assembly for welding. A first group of welded ribs having a vertical surface extending in the vehicle width direction and extending in a direction orthogonal to the pressing direction, and a rear surface of each flap in the pressing direction. It projects rearward along the vehicle and extends in the vehicle width direction, and has a second welded rib group welded to the end of the first welded rib group as well as having the end portion as the vertical surface. , Interior product for airbag mounting.

According to this configuration, since the first welded rib group and the second welded rib group have vertical surfaces at the ends in the front-rear direction, they are surely welded by pressure from the front-rear direction.

Further, the present invention is a manufacturing method in which the retainer of the airbag mounting interior product and the panel are assembled, and the tips of the first rib of the retainer and the second rib of the panel are infrared rays. The first step of melting with a welding machine and the welding end surface of the first rib and the second rib are moved relative to each other in the pressurizing direction by using a jig to move the retainer and the panel closer to each other. It is a method of manufacturing an interior product for mounting an airbag, which comprises a second step of abutting and pressurizing in a direction perpendicular to the air bag.

According to this configuration, using a jig, the first rib of the retainer whose tip is melted and the second rib of the panel are perpendicular to the welded end surface in a state where the welded end faces face each other in parallel. It can be pressed in various directions. Therefore, the ribs of the retainer and the panel can be efficiently pressurized and welded to each other.

It is sectional drawing of the instrument lower panel of the interior part for airbag attachment which concerns on 1st Embodiment of this invention. It is a vertical sectional view of the retainer of the interior part for airbag attachment of 1st Embodiment. It is a vertical cross-sectional view of the set of the airbag, the inflator, the fixing member, and the case of the interior part for attaching the airbag of 1st Embodiment. It is a schematic front view seen from the rear side of the vehicle which shows the assembled state of the interior part for airbag attachment of 1st Embodiment. It is sectional drawing of the VV cross section in FIG. 4 of the interior part for airbag attachment of 1st Embodiment. It is sectional drawing of the interior product for airbag attachment which concerns on 2nd Embodiment of this invention. It is sectional drawing of the main part of the interior part for attaching an airbag of 2nd Embodiment. It is sectional drawing just before welding of the main part of the interior part for airbag attachment which concerns on the 1st modification of this invention. It is sectional drawing at the time of completion of welding of the main part of the interior part for airbag mounting shown in FIG. It is sectional drawing just before welding of the main part of the interior part for airbag attachment which concerns on the 2nd modification of this invention. It is sectional drawing at the time of completion of welding of the main part of the interior part for airbag mounting shown in FIG.

Hereinafter, with reference to FIGS. 1 to 11, specific embodiments of the airbag mounting interior product and the manufacturing method thereof according to the present invention will be described with reference to the drawings. In each of the following embodiments, the occupant sits facing the front of the vehicle in the "front", "rear", "left", "right", "up", and "down" directions used in the explanation. Occasionally, it is assumed that the direction of the occupant is "front", "rear", "left", "right", "up", and "down".

[First Embodiment]
The airbag mounting interior product of the first embodiment is an interior product applied to the vehicle knee airbag device 9. As shown in FIG. 5, the vehicle knee airbag device 9 is provided so that the retainer 2 is integrated with the instrument lower panel base material 1 provided at the front portion of the vehicle interior.

The instrument lower panel base material 1 is attached so as to be inclined from the rear and upper side of the vehicle to the front and lower side of the vehicle.

The retainer 2 is joined to the front side of the inclined instrument lower panel base material 1.

Component part:
Instrument lower panel:
As shown in FIGS. 1 and 4, the instrument lower panel includes an instrument lower panel base material 1, a cushion layer 7 and a skin 8 joined to the rear side of the instrument lower panel base material 1, and the instrument lower panel base. The material 1 is defined by "day" -shaped tier lines 15, 16, 17, 18, and 19 formed at positions corresponding to the boundaries of the flaps 22 and 23 of the lid 21 facing the rear of the retainer 2 described later. It has an opening portion 11 composed of two doors 12 and 13 and an outer peripheral portion 14 surrounding the opening portion 11.

The instrument lower panel may be composed of only the instrument lower panel base material 1 without the cushion layer 7 and the skin 8.

Retainer:
As shown in FIG. 2, the retainer 2 has a lid 21 provided in parallel with the back surface of the opening portion 11, a frame portion 24 protruding forward, and extending toward the outer peripheral side of the frame portion 24 and parallel to the instrument lower panel. It is composed of a flange portion 27 provided.

The lid 21 is composed of an upper flap 22 and a lower flap 23, and the flange portion 27 is a frame-like shape formed along the periphery of the lid 21. The upper flap 22 is connected to the rear end of the frame portion 24 via a hinge portion 25. Further, the lower flap 23 is similarly connected to the rear end of the frame portion 24 via the hinge portion 26.

The hinge portions 25 and 26 are formed so that the cross-sectional shape is a "U" shape in which the opening is substantially rearward. Further, the hinge portions 25 and 26 are curved toward the opening side, and at the same time, the thickness, material, and thickness of the flaps 22 and 23 that expand toward the passenger compartment are regulated within a certain range. , Shape, etc. are set.

In addition, the two flaps 22 and 23 of the lid 21 and the flange portion 27 are both parallel to the instrument lower panel base material 1 and the fixing plate portion 28 of the retainer 2 facing the front side of the instrument lower panel base material 1. To configure.

Since the boundaries of the two flaps 22 and 23 correspond to the tearlines 15, 16, 17, 18 and 19, they are formed to have substantially the same size and shape as the upper door 12 and the lower door 13, respectively.

The frame portion 24 is formed in a tubular shape so as to extend from the inner portion of the flange portion 27 along a substantially horizontal direction forward, and the pair of side wall portions 24U, 24D of the frame portion 24 facing in the vertical direction of the vehicle. Is formed with locking holes 24H penetrating in the thickness direction thereof.

Welded rib group:
It extends in the vehicle width direction between the front side of the instrument lower panel and the rear side of the fixing plate portion 28 (at least between the front side of the opening portion 11 and the rear side of the lid 21). The first welded rib group 10 which protrudes forward from the front side of the opening portion 11 and whose end portion is a vertical surface extending in a direction orthogonal to the protruding direction, and the lid 21 protrudes rearward from the rear side. A second welded rib group 20 that can be welded is provided corresponding to the first welded rib group 10 so that the end portion is a vertical plane extending in a direction orthogonal to the protruding direction thereof.

Case:
The case 3 is provided on the front side of the lid 21 of the retainer 2, and is fixed to the vehicle body via a fixing component (not shown). As shown in FIG. 3, the case 3 has a main body portion 31 formed in a box shape. The main body 31 has an opening 31H on the doors 12 and 13 sides, and has a bottom 31B on the opposite side of the opening 31H.

Further, the main body portion 31 is arranged inside the frame portion 24, and among the peripheral wall portions 31C formed on the main body portion 31, the ends of the pair of side wall portions facing in the vertical direction of the vehicle on the opening 31H side. A locking portion 32 is formed in each portion. At the time of assembly, the locking portion 32 is locked in the corresponding locking hole 24H.

Inflator:
The inflator 4 is fixed in the case 3 by the fixing member 5. Further, the inflator 4 is configured to supply gas to the inside of the airbag 6 so that the airbag 6 is expanded and deployed when a signal output from a control device (not shown) is input. There is.

Airbag:
The airbag 6 is housed inside the case 3 in a folded state, and its base end portion 6E is fixed to the bottom portion 31B.

Welding and assembly:
The cushion layer 7 and the skin 8 are attached in this order to the corresponding positions on the rear side of the instrument lower panel base material 1, to form the instrument lower panel.

The end of the first welded rib group 10 and the end of the second welded rib group 20 between the front side of the instrument lower panel base material 1 and the rear side of the fixing plate portion 28 of the retainer 2 Correspondingly, it is welded by infrared welding to ensure that the retainer 2 and the instrument lower panel base material 1 are integrally integrated, and in particular, the flaps 22 and 23 are joined to the corresponding doors 12 and 13.

At this time, the instrument lower panel is fixed to the fixture, and both flaps 22 are used in the direction along the frame portion 24 (that is, in the substantially horizontal direction in the front-rear direction) by the pressing jig arranged in the frame portion 24 of the retainer 2. , 23 are pressed against the instrument lower panel base material 1. At the same time, the welded ribs L arranged around the first and second welded rib groups 10 and 20 are also welded to each other.

At this time, each of the ribs 10, 20, and L extends in the pressing direction, that is, in the substantially horizontal direction in the front-rear direction, and the end portion thereof is a vertical surface extending in the direction orthogonal to the pressing direction, so that the ribs are reliably welded. Orthogonal.

After that, a fixing device (not shown) is attached to the case 3 to which the inflator 4, the fixing member 5, and the folded airbag 6 are fixed, and the locking hole 24H of the retainer 2 is locked in the locking portion 32. , Complete the knee airbag device 9.

Behavior and effects:
Next, the operation and effect of the embodiment of the present invention will be described.

According to the knee airbag device 9, when the control device outputs a signal to the inflator 4 in order to restrain the occupant when necessary, the inflator 4 supplies gas to the airbag 6 and the airbag 6 is used. Is supplied with gas and begins to expand and expand toward the passenger compartment. Therefore, the flaps 22 and 23 of the retainer 2 are unfolded, and the flaps 22 and 23 are subjected to the pressure from the airbag 6 on the back surface of the flaps 22 and 23, and the flaps 22 and 23 are elastically deformed by the hinge portions 25 and 26. It rotates around and opens toward the passenger compartment.

At the same time, the two doors 12 and 13 of the opening portion 11 welded to the flaps 22 and 23 are cleaved from the tier lines 15, 16, 17, 18 and 19 and deployed together with the flaps 22 and 23. , The airbag 6 smoothly deploys into the vehicle interior.

In the first embodiment described above, the lid 21 and the flange portion 27 of the retainer 2 are described in the "first wall portion" described in the claims, and the instrument lower panel base material 1 is described in the claims. Each of the ribs constituting the second welded rib group 20 and the welded rib L forming the first welded rib group 10 in the "first wall portion" described in the claims. The rib and the welded rib L correspond to the "second rib" described in the claims, respectively.

Further, in the above-described first embodiment, the airbag mounting interior product is applied to the vehicle knee airbag device 9. However, the present invention is not limited to this, and the airbag mounting interior may be applied to a vehicle airbag device arranged in front of the upper body of the target occupant, or the airbag. The mounting interior may be applied to a vehicle airbag device arranged laterally to the target occupant.

[Second Embodiment]
The airbag mounting interior product 100 of the second embodiment is an interior product applied to a vehicle airbag device. The airbag mounting interior product 100 is a panel member that holds the airbag 101 and explodes when the airbag 101 is deployed. As shown in FIG. 6, the airbag mounting interior component 100 includes a case 110, a retainer 120, and an instrument panel 130.

The airbag 101 is a bag-shaped seat member for protecting an occupant seated on a vehicle seat. The airbag 101 is arranged in front of the target occupant. The gas generated by the inflator 102 during deployment is supplied to the inside of the airbag 101. An external control device (not shown) is electrically connected to the inflator 102. The inflator 102 generates a high-pressure gas and supplies it to the inside of the airbag 101 by inputting a deployment signal for expanding and deploying the airbag 101 from the control device. The airbag 101 protects the occupant by expanding and deploying rearward by supplying gas from the inflator 102.

The case 110 is a housing member that houses the airbag 101 before expansion and deployment. The case 110 is formed in a box shape so as to accommodate the folded airbag 101. The case 110 has a main body portion 111 including a bottom wall 111a, a side wall 111b, and an opening 111c.

The side wall 111b is a tubular portion formed in a tubular shape. One end side of the side wall 111b is closed by the bottom wall 111a. The bottom wall 111a and the side wall 111b form a storage space 112 in which all or a part of the folded airbag 101 is housed. The airbag 101 is housed in the storage space 112 with its base end fixed to the bottom wall 111a of the main body 111 of the case 110. Further, the inflator 102 is fixed to the case 110 via a fixing component.

The opening 111c is provided on the other end side of the side wall 111b, and faces the bottom wall 111a on the side where the airbag 101 is deployed. In the case 110, the opening 111c of the main body 111 is located on the side where the vehicle occupant sits (specifically, the rear side), that is, the contained airbag 101 is deployed toward the vehicle interior through the opening 111c. Have been placed.

The case 110 further has a locking portion 113. The locking portion 113 is integrally formed with the main body portion 111. The locking portion 113 is a claw portion provided at the end portion of the side wall 111b of the main body 111 on the opening 111c side so as to project outward in the radial direction of the side wall 111b. The locking portion 113 is provided at a plurality of locations (for example, one location each on the top and bottom) on the main body portion 111. The locking portion 113 is a portion for attaching and fixing the case 110 to the retainer 120 by being locked to the retainer 120.

The retainer 120 is a holding member that holds the case 110 that houses the airbag 101. The retainer 120 is a member for attaching the airbag 101 to the instrument panel 130 on the back surface side opposite to the front surface on the vehicle interior side (that is, the rear side). The retainer 120 is made of resin. The material of the retainer 120 is, for example, a polyolefin-based soft resin (TPO) or a superolefin polymer (TOP). The retainer 120 has a structure in which the base portion 121, the tubular portion 122, and the lid portion 123 are integrally formed by injection molding or the like.

The base portion 121 is a fixing portion that is joined and fixed to the back surface of the instrument panel 130. The base portion 121 is formed in a frame shape. The method of fixing the base 121 and the instrument panel 130 will be described in detail later. The tubular portion 122 is formed in a frame shape so as to extend forward from the back surface (that is, the front surface) of the base portion 121, and holds the case 110 on the inner peripheral side thereof. The lid portion 123 is formed so as to cover the inside of the frame of the frame-shaped base portion 121, and rotates so as to be opened by being pressed when the airbag 101 is expanded and deployed.

The tubular portion 122 is provided with a locking hole 122a formed in the peripheral wall. The number of locking holes 122a is provided in a number corresponding to the number of locking portions 113 of the case 110. The locking portion 113 of the case 110 is locked in the locking hole 122a. The case 110 is held by the retainer 120 by locking the locking portion 113 into the locking hole 122a of the tubular portion 122.

The lid portion 123 has two flaps 123a and 123b. The flaps 123a and 123b are plate-shaped members formed in a rectangular shape, for example, and are arranged so that an opening 123c is formed between the flaps 123a and 123b. The upper edge of the flap 123a is connected to the upper frame portion of the base portion 121 via the hinge portion 124a. Further, the lower edge of the flap 123b is connected to the lower frame portion of the base portion 121 via the hinge portion 124b. The opening 123c is a horizontally extending slit hole. The lid portion 123 is not limited to the double-door type, and may be a single-sided type having one flap. Further, the number of flaps of the lid portion 123 may be 3 or more.

The hinge portion 124a connects the flap 123a to the inner edge of the base portion 121 in a rotatable state with the upper edge as a fulcrum. Further, the hinge portion 124b connects the flap 123b to the inner edge of the base portion 121 in a rotatable state with the lower edge thereof as a fulcrum. The hinge portions 124a and 124b each extend in a strip shape in the left-right direction, and are formed in a U-shaped cross section. In the hinge portions 124a and 124b, the flaps 123a and 123b are difficult to rotate to the front side depending on the pressing force from the rear side to the front side, and conversely, rotate to the rear side due to the pressing force from the front side to the rear side. For ease of use, the opening of the U-shaped groove in the cross section is arranged so as to face rearward. The hinge portions 124a and 124b are each formed of, for example, an elastomer.

In the structure of the lid portion 123, when the airbag 101 housed in the case 110 held by the retainer 120 expands and expands, the flap 123a presses from the front side to the rear side due to the expansion and expansion of the airbag 101. The flap 123b is pressed from the front side to the rear side and is rotated around the lower edge thereof while being rotated around the upper edge thereof. The lid portion 123 opens wide around the opening 123c due to the rotation of the flaps 123a and 123b.

That is, the retainer 120 has a base portion 121 and a lid portion 123 that define the side where the airbag 101 is deployed in the accommodation space 112 of the case 110 in which the airbag 101 is accommodated, and is a part of the lid portion 123. (Specifically, the opening 123c) is formed so as to open.

The instrument panel 130 is a plate-shaped member used as an interior material of a vehicle interior (cabin) of a vehicle. The instrument panel 130 is provided, for example, at a position facing the upper body of an occupant seated in the passenger seat. The retainer 120 is fixed to the back surface (that is, the front surface) of the instrument panel 130. The instrument panel 130 has a panel base material 131. The instrument panel 130 is not limited to the one made of only the panel base material 131, and may have a cushion material and a skin material.

The panel base material 131 is a plate-shaped member made of resin. The material of the panel base material 131 is, for example, a polyolefin-based soft resin (TPO) or a superolefin polymer (TOP). The material of the panel base material 131 may be different from the material of the retainer 120. The panel base material 131 is convexly curved toward the vehicle interior side, and is formed so as to be inclined in the horizontal direction from the upper front side to the lower rear side. Further, the retainer 120 is curved according to the curved shape of the panel base material 131, and is formed so as to be inclined from the upper front side to the lower rear side. The panel base material 131 is arranged so as to face the base portion 121 and the lid portion 123 of the retainer 120 on the side where the airbag 101 is deployed.

A tear line 131a is formed on the panel base material 131. The tear line 131a is provided at a position corresponding to the peripheral edge of each flap 123a, 123b of the lid portion 123 of the retainer 120 fixed to the panel base material 131. The tear line 131a is for facilitating the opening of the panel base material 131 into the two doors when the airbag 101 is expanded and deployed.

The panel base material 131 is joined and fixed to the retainer 120 by being welded to the base portion 121 and the lid portion 123 of the retainer 120. Specifically, the retainer 120 and the panel base material 131 of the instrument panel 130 are infrared-welded to each other. Infrared welding is performed using an infrared welding machine (not shown). Infrared welding means that the retainer 120 and the panel base material 131 are irradiated with infrared wavelengths from an infrared welding machine to transfer heat in a non-contact manner to plasticize the retainer 120 and the panel base material 131, and the molten retainer 120 is used. It is a welding in which the panel base materials 131 are resolidified and joined together in a pressurized state.

The base portion 121 and the lid portion 123 of the retainer 120 are curved in a convex shape toward the vehicle interior side. The base portion 121 and the lid portion 123 of the retainer 120 have an inclined surface 120a inclined in the horizontal direction from the upper front side to the lower rear side. The inclination angle of the inclined surface 120a may change depending on the portion of the retainer 120 according to the degree of curvature thereof. The base portion 121 and the lid portion 123 of the retainer 120 are formed so as to have substantially the same thickness over the entire area. The inclined surface 120a is formed so that the normal on the rear surface side (front surface side) faces diagonally upward rearward and the normal line on the front surface side (back surface side) faces diagonally forward and downward.

The retainer 120 and the panel base material 131 of the instrument panel 130 are relatively moved in a substantially horizontal direction at the time of assembly for welding, and are pressed in a state of being in contact with each other. The pressurizing direction at the time of assembling the retainer 120 and the panel base material 131 is a substantially horizontal direction. Then, the retainer 120 and the panel base material 131 are welded in a pressurized state in which both are pressurized in a substantially horizontal direction. The inclined surface 120a of the retainer 120 described above is inclined with respect to the pressurizing direction when the retainer 120 and the panel base material 131 are assembled.

The retainer 120 has ribs 120b as shown in FIG. The rib 120b is provided on the rear surface side (that is, the surface side) of the base portion 121 and the lid portion 123 of the retainer 120. The rib 120b protrudes linearly from the base portion 121 and the lid portion 123 toward the panel base material 131 along the above-mentioned pressurizing direction, and extends in the vehicle width direction in the protruding state. A plurality of ribs 120b are provided, and the ribs 120b are arranged substantially evenly over the entire area of the base portion 121 and the lid portion 123. The ribs 120b include ribs protruding from the inclined surface 120a of the base portion 121 and the lid portion 123 (four ribs are shown in FIG. 6) and ribs protruding from a surface other than the inclined surface 120a. Each rib 120b has a welded end surface 120c whose normal extends in the pressurizing direction. The welded end surface 120c forms a surface that extends in a direction perpendicular to the above-mentioned pressurizing direction.

The panel base material 131 is curved in a convex shape toward the vehicle interior side. The panel base material 131 has an inclined surface 131b inclined in the horizontal direction from the upper front side to the lower rear side. The inclination angle of the inclined surface 131b may change depending on the portion of the panel base material 131 according to the degree of bending thereof. The panel base material 131 is formed so as to have substantially the same thickness over the entire area. The inclined surface 131b is formed so that the normal on the rear surface side (front surface side) faces diagonally upward rearward and the normal line on the front surface side (back surface side) faces diagonally forward and downward. The inclined surface 131b is inclined with respect to the pressurizing direction when the retainer 120 and the panel base material 131 are assembled.

As shown in FIG. 7, the panel base material 131 has ribs 131c. The rib 131c is provided on the front surface side (that is, the back surface side) of the panel base material 131. The rib 131c protrudes linearly from the panel base material 131 toward the retainer 120 along the above-mentioned pressurizing direction, and extends in the vehicle width direction in the protruding state. A plurality of ribs 131c are provided so as to have a one-to-one correspondence with the ribs 120b of the retainer 120, and are arranged substantially evenly over the entire area of the panel base material 131. The rib 131c includes a rib protruding from the inclined surface 131b (four points are shown in FIG. 6) and a rib protruding from a surface other than the inclined surface 131b. Each rib 131c has a welded end surface 131d whose normal extends in the pressurizing direction. The welded end surface 131d forms a surface that extends in a direction perpendicular to the above-mentioned pressurizing direction.

The welded end surface 120c of the rib 120b of the retainer 120 and the welded end surface 131d of the rib 131c of the panel base material 131 of the instrument panel 130 face each other in parallel. The direction in which the welded end faces 120c and 131d face each other coincides with the pressing direction in which the retainer 120 and the panel base material 131 are brought into contact with each other and pressurized by being relatively moved during assembly.

A method of manufacturing the airbag mounting interior product 100 of the present embodiment will be described.
First, a retainer 120 having a base 121 and a lid 123 defining the side where the airbag 101 of the storage space 112 of the case 110 in which the airbag 101 is housed is deployed is prepared, and an instrument welded to the retainer 120 is prepared. The panel base material 131 of the ment panel 130 is prepared. Then, the tips of the retainers 120 and the ribs 120b and 131c of the panel base material 131 are heated to a predetermined temperature by an infrared welding machine and melted. Next, by using a jig to move the retainer 120 and the panel base material 131 whose tips are melted relative to each other in the horizontal direction (pressurizing direction), the welded end faces 120c and 131d of the ribs 120b and 131c are moved. The welding end faces 120c and 131d are brought into contact with each other in a direction perpendicular to the welding end surfaces, and pressure is applied. By this method, the airbag mounting interior product 100 in which the ribs 120b and 131c of the retainer 120 and the instrument panel 130 are infrared-welded to each other is manufactured.

Next, the operation of the airbag mounting interior product 100 of the present embodiment will be described.
In the airbag mounting interior component 100, when the airbag 101 expands and expands due to the gas supply from the inflator 102, first, the lid 123 of the retainer 120 is pressed from the back surface side toward the front surface side to open the airbag 101. Move. Then, when the lid portion 123 rotates, the instrument panel 130 is cleaved along the tear line 131a of the panel base material 131 due to the rotation, and the airbag 101 is opened into the vehicle interior through the cleaved gap. It swells inward. As a result, the vehicle occupant can be protected by the airbag 101 that bulges toward the vehicle interior side.

In the airbag mounting interior product 100 of the present embodiment, the retainer 120 holding the case 110 in which the airbag 101 is housed and the instrument panel 130 to which the retainer 120 is mounted are joined to each other by infrared welding. In this infrared welding, the welded end surface 120c of the rib 120b of the retainer 120 and the welded end surface 131d of the rib 131c of the panel base material 131 of the instrument panel 130 face each other in parallel, and the facing directions are the retainer 120 and the panel base material 131. It is performed in a state that matches the pressurizing direction due to relative movement during assembly with.

In this structure, all the ribs 120b and 131c including the ribs 120b and 131c formed on the inclined surfaces 120a and 131b of the retainer 120 and the panel base material 131 move relative to each other when the retainer 120 and the panel base material 131 are assembled. It has welded end faces 120c and 131d oriented in the pressurizing direction. That is, the welded end faces 120c and 131d of all the ribs 120b and 131c form a surface that spreads in a direction perpendicular to the pressurizing direction when the retainer 120 and the panel base material 131 are assembled. Therefore, the welded end surfaces 120c and 131d of the ribs 120b and 131c (particularly, the ribs 120b and 131c formed on the inclined surfaces 120a and 131b) are not surfaces that are inclined and spread in the above-mentioned pressurizing direction. It is possible to prevent the 120c and 131d from being pressed in a direction inclined with respect to the welded end faces 120c and 131d at the time of welding, and the pressure is directed in a direction perpendicular to the welded end faces 120c and 131d. It can be carried out.

Therefore, according to the airbag mounting interior product 100 of the present embodiment, the welded ribs 120b and 131c of the retainer 120 and the instrument panel 130 are formed on the inclined surfaces 120a and 131b having a large inclination angle with respect to the vertical direction. Even if it is formed, the pressing force required for welding the retainer 120 and the instrument panel 130 can be efficiently applied between the welded end faces 120c and 131d, and the ribs 120b and 131c are welded to each other. Can be reliably performed under appropriate pressure. That is, the ribs 120b and 131c including those on the inclined surfaces 120a and 131b of the retainer 120 and the instrument panel 130 can be efficiently pressurized and welded to each other.

Further, since the retainer 120 and the panel base material 131 of the instrument panel 130 are joined by infrared welding, the retainer 120 and the panel base material 131 can be reliably integrated.

In the second embodiment described above, the base portion 121 and the lid portion 123 of the retainer 120 are in the "first wall portion" described in the claims, and the panel base material 131 of the instrument panel 130 is in the claims. In the "second wall portion" described in the above, the rib 120b of the retainer 120 is described in the claims, and the rib 131c of the panel base material 131 of the instrument panel 130 is described in the claims. It corresponds to each of the "second ribs".

By the way, in the above-mentioned second embodiment, the retainer 120 and the instrument panel 130 are joined by infrared welding. However, the present invention is not limited to infrared welding as long as the rib 120b of the retainer 120 and the rib 131c of the panel base material 131 of the instrument panel 130 can be bonded, and the present invention is not limited to infrared welding, but ultrasonic welding, high frequency welding, and laser welding. , Other welding such as vibration welding may be used.

Further, in the second embodiment described above, the ribs 120b of the retainer 120 melted by infrared rays and the ribs 131c of the panel base material 131 of the instrument panel 130 are welded to each other, and the welded end faces 120c and 131d are welded to each other. Welding is performed by pressurizing the material so that it is in contact with the infrared ray in the direction perpendicular to the infrared ray. If there is no difference between the rib widths of the ribs 120b and 131c and the tip shapes of the ribs 120b and 131c are not sharp (contrast structure), the welded end faces 120c and 131d will be together when infrared welding is performed as described above. It is pressed with a substantially uniform pressure over the entire contact surface. When the entire contact surface is pressed with a substantially uniform pressure, it is difficult for one tip of the ribs 120b, 131c to enter the other welded end surface 120c, 131d to form a recess in the other. Therefore, in the above structure, the contact area between the tips of the ribs 120b and 131c is not secured, and the tips of one rib 120b and 131c are not surrounded by the other ribs 120b and 131c. Welding strength or bonding strength remains low.

Therefore, in order to improve the welding strength or the bonding strength between the ribs 120b and 131c of the retainer 120 and the panel base material 131, both ribs 120b and 131c are attached to the welding end surfaces 120c and 131d of which one of the tips is the other. It may be welded in a state of being fitted in the formed recess.

For example, as shown in FIG. 8, the rib width W2 of the rib 131c of the panel base material 131 is smaller than the rib width W1 of the rib 120b of the retainer 120, respectively, for the panel base material 131 of the retainer 120 and the instrument panel 130. Form as. The rib widths W1 and W2 are dimensions in a direction perpendicular to the protruding direction of the ribs 120b and 131c, and specifically, are dimensions in the vertical direction of the ribs 120b and 131c. Further, for example, the rib width W1 may be about 1.5 mm, the rib width W2 may be about 2.5 mm, and the difference between the rib width W1 and the rib width W2 may be about 1 mm.

Next, the tips of the ribs 120b and 131c of the retainer 120 and the panel base material 131 are melted by an infrared welding machine, and then the retainer 120 and the panel base material 131 whose tips are melted by using a jig, respectively. By moving the ribs 120b and 131c relative to each other in the horizontal direction (pressurizing direction), the welded end faces 120c and 131d of the ribs 120b and 131c are brought into contact with each other in the direction perpendicular to the welded end faces 120c and 131d and pressurized.

When the ribs 120b and 131c are pressed against each other, the rib 131c of the panel base material 131 having a small rib width presses a part of the welded end surface 120c of the rib 120b of the retainer 120 having a large rib width, so that the stress is concentrated. Therefore, as shown in FIG. 9, the recess 120d is formed in the welded end surface 120c of the molten rib 120b, and the tip portion of the rib 131c fits into the recess 120d. In this case, the rib 120b and the rib 131c are welded in a state where the tip end portion of the rib 131c is fitted in the recess 120d formed in the welded end surface 120c of the rib 120b. Therefore, according to the structure of this modified form, the contact area between the tips of the ribs 120b and 131c can be increased, and the tips of one rib 120b and 131c can be surrounded by the other ribs 120b and 131c. , 131c can be improved in welding strength or bonding strength. Therefore, the ribs 120b and 131c can be pressurized and welded to each other more efficiently.

Further, for example, as shown in FIG. 10, the panel base material 131 of the instrument panel 130 is formed so that the rib 131c has a sharp tip 131e at the tip thereof. Then, the tips of the ribs 120b and 131c of the retainer 120 and the panel base material 131 are melted by an infrared welding machine, and then the retainers 120 and the panel base material 131 whose tips are melted are melted together using a jig. By moving relative to each other in the approaching horizontal direction (pressurizing direction), the welded end surface 120c of the rib 120b and the outer surface of the tip portion 131e of the rib 131c are brought into contact with each other in the direction perpendicular to the welded end surface 120c to pressurize.

When the pressure is applied between the ribs 120b and 131c, the stress is concentrated by pressing the welded end surface 120c of the rib 120b in a state where the tip portion 131e of the rib 131c is sharp, so that the stress is concentrated as shown in FIG. While the recess 120e is formed in the welded end surface 120c of the molten rib 120b, the tip portion 131e of the rib 131c enters and fits into the recess 120e. In this case, the rib 120b and the rib 131c are welded in a state where the tip portion 131e of the rib 131c is fitted in the recess 120e formed in the welding end surface 120c of the rib 120b. Therefore, even in this modified structure, the contact area between the tips of the ribs 120b and 131c can be increased, and the tips of one rib 120b and 131c can be surrounded by the other ribs 120b and 131c. It is possible to improve the welding strength or the bonding strength between the two. Therefore, the ribs 120b and 131c can be pressurized and welded to each other more efficiently.

The modified forms shown in FIGS. 10 and 11 described above do not have a difference in rib width between the rib 120b of the retainer 120 and the rib 131c of the panel base material 131. However, the ribs 120b and 131c are welded by combining the deformed forms shown in FIGS. 10 and 11 with the deformed forms shown in FIGS. 8 and 9 and providing a difference in rib width between the ribs 120b and 131c. The strength or the joint strength may be further improved.

Further, in order to weld the ribs 120b and 131c of the retainer 120 and the panel base material 131 in a state where one of the tip portions is fitted into the recess formed in the other welded end surface 120c and 131d, FIG. -As in the two modified forms shown in FIG. 11, the tip of the rib 120b of the retainer 120 is not limited to being fitted into the recess of the welded end surface 131d of the rib 131c of the panel base material 131, and conversely, the panel base material 131 The tip end portion of the rib 131c may be fitted into the recess of the welded end surface 120c of the rib 120b of the retainer 120.

In order to properly weld the ribs 120b and 131c of the retainer 120 and the panel base material 131, the ribs 120b and 131c having a small rib width or a sharp tip have a high hardness of the material itself at the time of pressurization. It is effective to use the ribs 131c and 120b having a large rib width or a flat tip surface and having a small hardness of the material itself at the time of pressurization as the ribs 131c and 120b. This is because the ribs 120b and 131c having a high hardness of the material itself at the time of pressurization easily enter the welded end faces 131d and 120c of the ribs 131c and 120b having a low hardness of the material itself at the time of pressurization. This is because it becomes easier to join. For example, a material having a high hardness includes a superolefin polymer (TOP), and a material having a low hardness includes a polyolefin-based soft resin (TPO).

Further, as in the two modified forms shown in FIGS. 8 to 11 above, in order to improve the welding strength or the bonding strength between the ribs 120b and 131c of the retainer 120 and the panel base material 131, either of the ribs 120b and 131c is used. The method of welding in a state where one of the tip portions is fitted into the recess formed in the welded end faces 120c and 131d of the other may be applied to the configuration of the first embodiment.

Further, in the second embodiment described above, the airbag 101 is housed in front of the instrument panel 130 existing in front of the occupant, that is, the airbag 101 is arranged in front of the target occupant. However, it is intended to be applied to a vehicle airbag device that protects the target occupant by expanding and deploying the airbag 101 to the rear (inside the vehicle interior). However, the present invention is not limited to this, and the airbag is accommodated on the side of the door trim panels on the left and right sides of the vehicle body, and the target occupant is expanded by expanding and deploying the airbag to the side (inside the vehicle interior). It may be applied to an airbag device for a vehicle to be protected.

The present invention is not limited to the above-described embodiments and modifications, and various modifications can be made without departing from the spirit of the present invention.

1: Instrument lower panel base material, 10: First weld rib group, 11: Open part, 12: Upper door, 13: Lower door, 14: Outer part, 15: Upper tier line, 16: Lower tier line, 17 : Left tier line, 18: Right tier line, 19: Middle tier line, 2: Retainer, 20: Second weld rib group, 21: Lid, 22: Upper flap, 23: Lower flap, 24: Frame, 24U , 24D: Side wall, 24H: Locking hole, 25: Upper hinge, 26: Lower hinge, 27: Flange, 28: Fixing plate, 3: Case, 31: Main body, 31H: Opening, 31B: Bottom, 31C: Peripheral wall, 32: Locking part, 4: Inflator, 5: Fixing member, 6: Airbag, 6E: Base end, 7: Cushion layer, 8: Skin, 9: Knee airbag device, 100 : Interior parts for airbag mounting, 101: Airbag, 110: Case, 120: Retainer, 120a: Inclined surface, 120b: Rib, 120c: Welded end surface, 121: Base, 122: Tube, 123: Lid, 130 : Instrument panel, 131: Panel base material, 131b: Inclined surface, 131c: Rib, 131d: Welded end surface.

Claims (4)

A retainer having a first wall portion to which a case for accommodating an airbag is attached and arranged on the deployment side with respect to the airbag, and a retainer.
A panel having a second wall portion arranged so as to face the deployment side of the airbag with respect to the first wall portion of the retainer and being welded to the retainer.
It is an interior product for airbag mounting equipped with
The first wall portion and the second wall portion each have an inclined surface inclined with respect to a pressurizing direction in which the retainer and the panel are relatively moved during assembly for welding.
The retainer has a first rib that projects from the inclined surface of the first wall portion toward the panel side along the pressurizing direction.
The panel has a second rib welded to the first rib that projects from the inclined surface of the second wall portion toward the retainer side along the pressurizing direction.
Each of the first ribs and the second ribs have a weld end faces the direction facing parallel to each other coincides with the pressing direction,
An interior product for mounting an airbag in which the rib width of the first rib and the rib width of the second rib are the same as each other . A retainer having a plate-shaped first wall portion to which a case for accommodating an airbag is attached and arranged on the deployment side with respect to the airbag, and a retainer.
It has a plate-shaped second wall portion that is arranged to face the deployment side of the airbag with respect to the first wall portion of the retainer and is formed in accordance with the first wall portion, and is welded to the retainer. With the panel to be
It is an interior product for airbag mounting equipped with
The first wall portion and the second wall portion each have an inclined surface inclined with respect to a pressurizing direction in which the retainer and the panel are relatively moved during assembly for welding.
The retainer has a first rib that projects from the inclined surface of the first wall portion toward the panel side along the pressurizing direction.
The panel has a second rib welded to the first rib that projects from the inclined surface of the second wall portion toward the retainer side along the pressurizing direction.
The first rib and the second rib each have a welded end surface in which the directions facing each other in parallel correspond to the pressurizing direction.
An airbag mounting interior product in which the welded end surface of the first rib and the welded end surface of the second rib are welded to each other between the first wall portion and the second wall portion. The airbag mounting interior product according to claim 1 or 2 , wherein the retainer and the panel are joined to each other by infrared welding. A manufacturing method for assembling the retainer and the panel of the interior component for airbag mounting according to claim 1 or 2 .
The first step of melting the tips of the first rib of the retainer and the second rib of the panel with an infrared welding machine, and
By moving the retainer and the panel relative to each other in the pressurizing direction using a jig, the first rib and the second rib are brought into contact with each other in a direction perpendicular to the welding end surface. The second step of pressing and
A method of manufacturing interior parts for airbag mounting.

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