JPH11321522A - Pillar garnish molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pillar garnish molding capable of increasing resisting force of a boss for a tightening seat without enlarging a diameter of the boss for the tightening seat. SOLUTION: A pillar garnish molding is provided with a long-scaled base part 36 and a door part 38 for a bag connected by an integral hinge 37 along one side of the base part 36. The molding having a boss 46 for a metal tightening seat on the reverse side of the base part 36, is integrally injection molded including the boss 46 for the metal tightening seat from a plastic material. Injection molding is performed by positioning one of injection molding gates 63 in a peripheral surface of the boss 46 for the metal tightening seat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a long base portion and a bag door portion which is integral hinged along one side of the base portion. The present invention relates to a pillar garnish molded article having a boss and being integrally injection-molded from a plastic material including a boss for a metal fastening seat.

Here, the case of bolt (screw) fastening will be described as an example of metal fastening, but the present invention can be applied to other metal fastening such as rivet fastening.

[0003] Although the front pillar is described as an example of the pillar, the present invention can be applied to a rear pillar.

[0004]

2. Description of the Related Art In response to the recent demand for increased protection of occupants in automobiles, various side airbag devices for protecting the occupant's head have been proposed (Japanese Patent Laid-Open No. 9-240409 / 31).
No. 5253). The outline of these side airbag devices is as follows.

[0005] The side airbag device includes an inflator and an airbag. The inflator is usually cylindrical in relation to the storage space, and is mounted near the door belt line on the inside of the front pillar (inner panel). The airbag includes a cylindrical air inflow port for connecting an inflator, and a protection curtain portion having a substantially parallelogram in a developed shape. In the airbag, the protective curtain portion is folded into a long length, and the vehicle body (body) is attached from the front pillar, which is a constituent member, to the roof side rail.

The present inventors have previously proposed a pillar garnish having the following schematic structure (Japanese Patent Application No. 9-129617, unpublished at the time of filing).

[0007] The pillar garnish usually comprises a molded part integrally formed of a plastic material, and a skin part to cover a design side surface of the molded part. The molded part is a long base part and one side of the base part. And a door portion for a bag, which is integral hinged along, and bosses for bolt fastening seats are formed at both ends of the back surface of the base portion so that fastening by screw fastening (bolt / nut) is possible. ing.

The molding of the molded part (garnish molded body) is usually performed by injecting a plastic material into the cavity of the injection molding die through a plurality of pinpoint gates on the rotating end side of the bag door. (Injection) and molding.

[0009]

In the above garnish, the screw of the boss bolt and the nut for the bolt fastening seat on the roof side rail side is screwed tightly, and the airbag acting on the garnish molded product (formed portion) when the airbag device is operated. It is required to have a strength that directly receives the expansion / expansion output and withstands the expansion / expansion output.

[0010] Then, a garnish molded body (molded part)
In the case of insertless from the viewpoint of productivity etc., it is necessary to ensure strength and shape retention by the plastic material itself forming the molded part. Need to be formed. For this reason, the opening resistance of the bag door portion increases, and the force (load) acting on the boss for the bolt fastening seat also relatively increases. It is conceivable to make the integral hinge part thinner in order to reduce the opening resistance, but if it is made thinner, the overall shape retention of the molded part will be reduced and the bag door part may be scattered. I do.

Therefore, it is necessary to increase the strength of the bolt fastening seat boss to withstand the load. This requirement can be met by increasing the diameter (wall thickness) of the bolt fastening seat boss. However, the width of the pillar garnish molded body is fixed, and it is necessary to secure a storage space for the folded airbag, and it is also necessary to secure a storage space for the wire harness and the like. There was a limitation in increasing the diameter, and the degree of freedom in design was small.

In view of the above, it is an object of the present invention to provide a pillar garnish molded body capable of increasing the strength of the fastening seat boss without increasing the diameter of the fastening seat boss.

[0013]

Means for Solving the Problems The present inventors have made intensive efforts to solve the above-mentioned problems, and as a result, the proof strength (breaking strength) of the metal fastening seat boss has been reduced. They found that they were governed by the fusion strength of the material fusion site (weld portion), and came up with a pillar garnish molded article having the following configuration.

A long base portion, a bag door portion integral hinged along one side of the base portion, a boss for a metal fastening seat on a back surface of the base portion, and a metal material made of a plastic material. A pillar garnish molded body integrally molded with the boss for the fastening seat is characterized by being injection-molded with one of the gates positioned on the peripheral surface of the boss for the metal fastening seat.

[0015]

As described above, the pillar garnish molded article of the present invention is formed by injection molding with the injection molding gate positioned on the peripheral surface of the metal fastening seat boss formed on the back surface of the base portion. As a result, the following operations and effects can be obtained.

Since the fusion strength of the plastic material fusion portion (weld portion) in the metal fastening seat boss is such that one of the gates is located on the peripheral surface of the metal fastening seat boss, the gate is located at the tip of the bag door portion. It increases compared to the case of injection molding. That is, since the fusion temperature of the material fusion portion in the metal fastening seat boss is high near the gate (close to the injection material temperature), the fusion state of the material fusion portion is good.

Therefore, the pillar garnish molded article of the present invention can increase the proof stress of the fastening boss without increasing the diameter of the metal fastening boss. Naturally, the garnish molded article can be freely designed. The degree also increases.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a side view of a mounting state of a pillar garnish molded body, FIG. 2 is a schematic perspective view of the back of the same pillar garnish molded body (molded portion), and FIGS.
2 is an enlarged cross-sectional view of the mounting state of the garnish molded body of the present embodiment at each of the lines 3-3, 4-4, and 5-5. It should be noted that in each of the figures, the symbol "D" indicates a door body.

The side airbag device 12 to which this embodiment is applied has an inflator 14 and an airbag 16. The inflator 14 is usually cylindrical in view of the storage space, and is attached to the inside of the front pillar 18 (inner panel) near the door belt line BL. The airbag 16 includes a cylindrical air inlet 22 for connecting the inflator 14 and a protective curtain portion 24 having a substantially parallelogram in a developed shape. In the airbag 16, the protective curtain portion 24 is folded into a long length, and the vehicle body (body) is attached to the roof side rail 26 from the front pillar 18, which is a constituent member. The protective curtain portion 24 includes the front-back connection portion 2
4a are formed at a plurality of locations. This is to prevent the protective curtain portion 24 from escaping in the vehicle width direction due to external force when the airbag 16 is deployed and inflated.

In this embodiment, the pillar garnish 28 includes a molded portion 32 integrally formed of a plastic material, and a skin portion 34 that covers a design side surface of the molded portion. A base portion 36 and a bag door portion 38 connected to an integral hinge 37 along one side of the base portion 36 are provided. Further, a back surface of the base portion 36 is provided with mounting means. The attachment means includes three different and integrated fixing means from the side of the door belt line BL toward the side of the roof side rail 26, that is, a retaining fitting 42, a locking clip 44, and a boss 46 for a bolt fastening seat. It consists of The workability of attaching the pillar garnish 28 to the front pillar 18 is improved, and the opening amount of the bag outlet is relatively increased from the viewpoint of quickly and smoothly popping out the airbag when the airbag is operated. This is to surely prevent the pillar garnish 28 from separating from the front pillar 18 (partial separation).

The molded part (molded body) 32 of the pillar garnish 28 according to the present embodiment includes a long base part 36 and a bag door part 38 connected to an integral hinge 37 along one side of the base part 36. And A boss 46 for a metal fastening seat is provided on the back surface of the base portion 36, and the boss 46 for the metal fastening seat is integrally formed of a plastic material by injection molding.

As shown in FIG. 3, the metal fastening seat boss 46 is a bolt fastening seat boss (hereinafter referred to as "fastening seat boss"). Specifically, in order to obtain the screw fastening force, the sleeve 50 with the metal flange 50a is driven into the fastening seat boss 46 to obtain the screw fastening force, so that the screw fastening force can be received by the metal / metal contact. ing. Further, a screw head (bolt head) 53
In order not to project from the design surface of the pillar garnish 28, the base side of the boss 46 for a fastening seat is
4 is provided. After the screw is fastened, a design cap 56 that closes the screw head storage recess 54 in order to hide the bolt head 53 can be attached.

The molding part 32 is not indispensable,
After the molding, the skin portion 34 is covered with a means such as bonding to form the pillar garnish 28.

Here, the molded portion 32 is provided with a fastening seat boss 46.
Injection molding is performed with one of the injection molding gates 63 positioned on the peripheral surface of the substrate (see FIG. 6). The other gates, as described above,
It may be formed on the edge along the longitudinal direction of the bag door portion 38, but may be formed on the retaining metal boss 48 and the clip boss 45, respectively. This is desirable because the strength of each boss can be secured.

More specifically, the portion where the fastening seat boss 46 is formed is formed by using a forming die M having a sectional structure as shown in FIG. In the illustrated example, the gate 63 is located at an intermediate height position of the boss 46 for the fastening seat. For. It should be noted that the gate position may be on the base side or the tip side as shown in the example of the figure.

The movable mold 60 includes a fixed mold 58 and a movable mold 60. The movable mold 60 includes a slide core 61 and can cut the gate 63. Also, a post 58a for forming a sleeve hole projects from the fixed mold 58 side.

Then, the cavity 64 of the molding die M is formed.
Then, after the plastic material is injected under pressure (injection) through the runner 62 and the gate 63, and cooled and solidified or heated and hardened, the slide core 61 is moved to cut the gate portion 63, and then the movable die 60 is moved Then, the mold is opened, and the molded body (molded portion) 32 is released from the fixed mold 58. At this time, since the fastening seat boss 46 is directly injected from the gate, the plastic material is almost fused before the progress of cooling and solidification (or heat hardening) starts, and the material fusion state is good. Therefore, the fusion strength of the fastening seat boss is not different from that of other general parts.

The plastic is preferably a polyolefin-based or polystyrene-based thermoplastic elastomer (TPO) capable of imparting the shape retention (rigidity) required for ordinary garnishes. It may be plastic. The range of the rigidity that can ensure the shape retention required for the garnish is 400 to 110 in flexural modulus (ASTM D 790).
0 MPa, desirably 700 to 900 MPa.

As described above, the fastening seat boss 46 has
After forming the sleeve 50 with the flange 50a, it is driven in.

In this embodiment, as described above, in addition to the fastening seat boss 46, other two kinds of fixing means are formed on the back surface of the base 36 of the garnish main body 32. That is, the locking clip 44 and the stopper fitting 42 are formed toward the door belt line side.

The locking clip 44 has an anchor shape as shown in FIGS. 2 and 4, and is not particularly limited. In the illustrated example, the locking clip 44 is formed by injection molding so as to protrude from the clip boss 45.

As shown in FIGS.
It is insert-molded and integrated with the retaining metal boss 48. The retaining fitting 42 is a large-diameter insert plate 4.
2a, a small diameter locking head 42b, and a shaft 42c connecting the both.

On the design surface side of the molded portion 32 of this embodiment,
The garnish 28 is formed by covering the decorative skin portion 34. Here, the decorative sheet forming the decorative skin portion 34 is not particularly limited, but may be any fabric, leather, soft print sheet, or the like as long as it is in harmony with other interior parts in the vehicle. The thickness of the decorative sheet is usually 0.5 to 5 mm.

The garnish 28 thus prepared is attached to the front pillar 18 constituting the vehicle body as described below.

Here, the front pillar 18 is basically formed of an inner panel 18a, an outer panel 18b, and a reinforcement 18c. Pillar 18
Are provided with a metal fitting locking hole 64, a clip locking hole 66, and a nut seating hole 68, respectively, corresponding to the retaining metal fitting 42, the locking clip 44, and the boss 46 for the bolt fastening seat. The metal fitting hole 64 has a keyhole shape having a wide insertion portion 64a at the lower end as shown in FIG. The clip locking hole 66 is a round hole into which a clip can be inserted and which can be stopped undercut. Further, a weld nut 70 is fixed to the back surface of the inner panel 18a at the position of the nut seat hole 68.

The folded airbag 16 is attached in advance along the roof side rail 26 from the front pillar 18 constituting the vehicle body (side member). In particular,
After the airbag 16 is folded, the folded shape of the airbag 16 is temporarily held by a strap 72 or the like (see FIG. 8). Then, it is screwed to each of the inner panels of the front pillar 18 and the roof side rail 26 via mounting margins 16a formed at a plurality of locations along the upper edge of the airbag 16 which is folded and held in shape by the strap 72. Install (see Fig. 1).

Also, if necessary, the front pillar 18
The wire harness 7 is provided above the line connecting the bracket locking hole 64, the clip locking hole 66, and the nut seat hole 68 of the roof side rail 26, that is, on the side opposite to the airbag mounting side.
4 etc. are wired.

In this state, after the locking head 42b of the stopper fitting 42 is inserted into the wide insertion portion 64a of the fitting locking hole 64,
While pulling the pillar garnish 28 toward the roof side rail 26, the locking clip 44 is inserted into the clip locking hole 66.
Then, the bolt 52 is screwed into the weld nut 70 (by screwing) so that the boss 46 for the bolt fastening seat corresponds to the weld nut 70, and the pillar garnish 28 is fixed to the front pillar 18. Then, the mounting is completed. At this time, the bolt head 53 of the bolt 52 is
A lower seat 53a is provided so as to be in metal contact with the sleeve 50, and an upper seat 53 is provided so that the design cap 56 can be locked.
b. Then, after the bolts are fastened, the design cap 56 is attached to the screw head storage recess 54 with its spring leg portion 56a locked to the upper stage seat portion 53b.

Finally, a door weather strip 80 having a trim portion 79 for closing a gap between the front pillar 18 and the bag door portion 38 of the pillar garnish 28 is attached to the sheet metal flange portion 19 of the front pillar 18.

The airbag 16 attached to the roof side rail 26 is covered with a side edge of the ceiling board 30.

Thus, the pillar garnish 28 stores the long airbag 16 in the folded state between the inner panel 18 a of the front pillar 18. When the airbag device 12 operates, the airbag 16 is deployed and expanded by the gas flowing from the inflator 14.
Swell. By the deployment / inflation output of the airbag 16,
The door of the molding section 32 is about to open. At this time, the forming part 3
Since the bending stiffness of No. 2 is relatively high, the bending resistance of the integral hinge 37 is also relatively high. For this reason, the deployment / inflation output of the airbag 16 acts on the back surface of the pillar garnish 28, and the locking leg 44a of the locking clip 44 is unlocked from the front pillar 18, so that the center of the pillar garnish 28 is removed. With both ends fixed, it floats up, and at the same time, the bag door section 38 is also forcibly rotated and opened, and the airbag jumps out quickly and smoothly, and expands and expands in a curtain shape. At this time, the roof side rail 26 side of the garnish 28 is fixed by screws and does not move.
Small width locking portion 64 of metal fitting hole 64 on belt line BL side
The locking head 42b of the retaining fitting 42 does not come off from the fitting locking hole 64 by moving to the side b. Therefore, in the pillar garnish 28, the opening amount of the outlet of the airbag 16 formed by the forced rotation of the door portion is larger than when only the bag door portion 38 is opened.
Develop and swell more smoothly.

When the airbag device is operated, a maximum load acts on the boss 46 for the fastening seat. As described above, the fusion of the material fusion portion of the boss 46 for the fastening seat is close to the material injection temperature immediately after the material injection. Good because it is performed at high temperature,
The strength of the fused part is the same as that of the non-fused part (general part) and has a sufficient strength.

Here, the pillar garnish has been described by taking as an example a molded body (molded portion) in which the design surface is covered with a skin portion 34. However, only the molded body, a painted molded body, or a painted molded body is described. The invention is also applicable to the body.

Note that the final fastening seat boss 46 is formed at one end of the pillar garnish molded body.
It may be formed at both ends. Also in this case, of course, the injection molding is performed by positioning the injection molding gate on the peripheral surface of the metal fastening seat boss.

[Brief description of the drawings]

FIG. 1 is a side view showing a mounting state of a pillar garnish molded body according to an embodiment of the present invention.

FIG. 2 is a schematic rear perspective view of the same.

FIG. 3 is an enlarged sectional view taken along line 3-3 of FIGS. 1 and 2;

FIG. 4 is an enlarged sectional view taken along line 4-4 of FIGS. 1 and 2;

FIG. 5 is an enlarged sectional view taken along line 5-5 of FIGS.

FIG. 6 is a view of a mold in a boss position of a fastening seat in a molded portion according to the present invention.

FIG. 7 is a plan view of a retaining bracket locking hole formed in the front pillar.

FIG. 8 is a cross-sectional view showing one mode of holding the shape of the folded airbag.

[Explanation of symbols]

 Reference Signs List 12 side airbag device 14 inflator 16 airbag 18 front pillar 26 roof side rail 28 pillar garnish molded body 32 molded part (garnish molded body) 34 decorative skin 36 base 37 integral hinge 40 mounting means 46 bolt fastening seat Boss (Boss for metal fastening seat) 50 Sleeve 52 Bolt BL Belt line

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Nagai 1 Ochiai Nagahata, Kasuga-cho, Nishi-Kasugai-gun, Aichi Prefecture Inside Toyoda Gosei Co., Ltd. Inside Toyoda Gosei Co., Ltd. (72) Inventor Hiroyuki Tajima 1 Ochiai Nagahata, Kasuga-cho, Nishi-Kasugai-gun, Aichi Prefecture Inside Toyoda Gosei Co., Ltd. (72) Inventor Hiroshi Ishiyama 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation

Claims (1)

[Claims] 1. A long base portion, a bag door portion integral hinged along one side of the base portion, a boss for a metal fastening seat on a back surface of the base portion, and a plastic In a pillar garnish molded body formed by injection molding of a material including a metal fastening seat boss, one of the injection molding gates is positioned on the peripheral surface of the metal fastening seat boss, and the injection molding is performed. Pillar garnish molded article.