JP4069702B2 - Car interior parts - Google Patents

Description

【図面の簡単な説明】
【図１】本発明を適用する蓋体部付きインストルメントパネルを示す全体斜視図
【図２】本発明の一実施形態における要部裏面図
【図３】図２の３−３線部位断面図
【図４】図３の４部位拡大断面図
【図５】図２の５―５線部位断面図
【図６】同じく６−６線部位断面図
【図７】図２の３−３線部位におけるエアバッグ飛び出し時のモデル断面図
【符号の説明】
１２ インストルメントパネル（インパネ）
１４ 蓋体部（観音開き）
１６ インパネ本体(内装品本体）
１８ エアバッグモジュール
２０ 蓋体リテーナ
２２ 湾曲ヒンジ部
２４ 回動端テアライン
２５ サイドテアライン
２６ ヒンジテアライン
２８ 前取付け壁部
３０ 後取付け壁部
３２ 回動板部
３４ リベット孔
３６ リベットピン[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automobile interior product including a lid for popping out an airbag. More specifically, the present invention relates to an automobile interior having a configuration including an interior product main body in which a lid portion is integrally formed and a lid retainer that is coupled to the back surface of the lid portion and is assembled to an airbag module.
[0002]
Hereinafter, in this specification, an instrument panel with an airbag lid (hereinafter referred to as “instrument panel”) will be mainly described as an example. In addition, air for side doors, pillars, front and back seats is used. The present invention can also be applied to a bag lid.
[0003]
[Background]
In a so-called hard instrument panel (general injection instrument panel) in which the instrument panel body is molded of a hard resin (for example, PPF: filler reinforced polypropylene), the bag lid that forms the airbag outlet of the passenger seat airbag device has conventionally been the instrument panel body. It was molded separately. For this reason, a gap and a step are easily generated between the bag lid and the instrument panel body, which is limited in design and increases the number of assembling steps.
[0004]
In view of this, it is provided with an interior product body (instrument panel body) in which a lid body portion is integrally formed, and a lid body retainer (airbag support assembly) that is coupled to the back surface of the lid body portion and assembled to the airbag module. A hard instrument panel has been proposed (see Japanese Patent Laid-Open No. 2000-71924, FIGS. 4 and 5).
[0005]
Then, the rotating portion of the lid retainer coupled to the back surface of the main body lid portion of the airbag support assembly separates the hinge portion from the back surface of the lid body and vibration welds the entire other portion (high frequency, ultrasonic, etc.) Or glued using an adhesive.
[0006]
Therefore, after the hinge tear line breaks after the pivot part tear line and the lid part is separated, the flexibility at the lid part joining part of the pivot part is completely restrained by the lid part made of hard resin. Substantially rigid. For this reason, when the hinge point of the rotating action moves from the hinge tear line of the lid body portion to the curved hinge portion of the lid body retainer, it is difficult for the curved hinge portion to absorb the impact accompanying the movement of the hinge point, and the bending hinge portion is bent. It is difficult to ensure the smoothness of exercise. Therefore, as in recent years, it is difficult to cope with a case where further rapid deployment of the airbag is required.
[0007]
Therefore, in order to solve the above problems, the present inventors have previously proposed an automobile interior product having the following configuration. (Japanese Patent Application No. 2001-342046 (Hei 13-11-7): not disclosed at the time of filing)
"Automobile interior parts with lids for airbag jumping out,
An interior product fat body integrally formed of a hard resin material with a lid body part together with the other part of the body, and a lid body retainer molded with a soft resin material bonded to the lid body part corresponding to the back surface of the interior product body In a configuration with
A side tear line that connects the pivot end tear line and the hinge tear line and the two tear lines along the lid pivot end and the lid hinge, respectively, is formed from the back side to the interior product main body.
The lid body retainer is coupled to the rear surface of the interior body of the interior of the interior body of the lid by a fixed portion coupled to the hinge outer portion of the lid body portion, and is coupled to the rear surface of the lid body portion via the curved hinge portion. A rotating part that is discontinuous,
The rotating portion of the soft resin coupling pair is mechanically (non-adhesively) coupled to the back surface of the lid portion. "
And in the said structure, it is set as the structure which forms a rivet hole group in the rotation part of a cover body retainer, and carries out thermal crimping via the rivet pin group protruded from the back surface of the cover body part corresponding to the rivet hole group. As a result, it is possible to easily manufacture a configuration in which the rotating portion is mechanically (non-adhered) coupled to the back surface of the lid portion (that is, with fewer manufacturing steps).
[0008]
However, in the case of the above configuration, when the automobile interior product is a paint specification, a minute depression (dent line) that is visually recognized depending on the viewing angle, etc., after drying the coating film or after mounting the actual vehicle, In particular, it has been found that it occurs at the lid rotation end portion (it is presumed to be formed most fragile in the tear line). These small dents are so small that they cannot be seen by hand.
[0009]
Although not affecting the inventive properties of the present invention, in Japanese Patent Application Laid-Open No. 11-240097, in a resin product such as an instrument panel, the linear expansion of the dissimilar material part surrounded by the main body part and the main body part and the surface part is performed. A technique for preventing thermal deformation by setting a coefficient and a flexural modulus within a predetermined range is disclosed.
[0010]
DISCLOSURE OF THE INVENTION
In view of the above, according to the present invention, after commercialization (after drying the coating film or after mounting on the actual vehicle), a minute depression (dent line) that is visually recognized depending on the viewing angle, etc., such as the condition of the light beam, is the lid rotation end portion. The purpose is to provide automobile interior parts that do not occur.
[0011]
In the present invention, as a result of diligent development to achieve the above object, the micro-dent (dent line) after commercialization has a difference in annealing shrinkage, that is, an instrument panel body material (hard material) This occurs when the shrinkage rate of the retainer of the lid retainer is smaller than a certain magnification than the resin material, and the micro-dent is generated at the pivot end portion of the lid, which is often formed more fragile than the other part of the tear line. I found it easy. In addition, automobile interior products such as instrument panels are not required to be annealed because finishing accuracy is not so required.
[0012]
And if the magnification of both linear expansion coefficients was in the predetermined range, it discovered that the said problem did not generate | occur | produce and came up with the automotive interior goods of the following structure.
[0013]
An automobile interior product with a lid for jumping out an airbag,
An interior product fat body integrally formed of a hard resin material with a lid body part together with the other part of the body, and a soft resin material that is substantially immovably associated with the lid body part on the back surface of the interior product body In the configuration provided with the lid retainer molded in
The annealing rate of the hard resin material and the soft resin material (condition: 80 ° C. × 1 h, left at room temperature for 1 day; the same applies hereinafter), the soft resin material is within 4 times that of the hard resin material, and the linear expansion coefficient ( JIS K 7197 (−35 ° C. to 110 ° C .; the same applies hereinafter) is characterized in that the hard resin material is within three times the soft resin material.
[0014]
By defining the annealing shrinkage and linear expansion coefficient of the hard material and the soft material as described above, as shown in the test examples described later, the product is further exposed to a high temperature atmosphere (annealing conditions) after the production. In the case where the annealing contraction occurs, the minute recess does not occur in the lid rotating end portion or the like. Of course, after the annealing contraction occurs, it is within a predetermined range of the linear expansion coefficient, so that the same micro-dent as the annealing contraction based on the difference of the linear expansion coefficient does not occur. In this case, the annealing rate and the linear expansion coefficient differ by two orders of magnitude, but the linear expansion coefficient is in units of 1 ° C., and when converted to a temperature difference of 100 ° C., it is the same order. Further, the reason why the allowable width of the linear expansion coefficient is made smaller than that of the annealing shrinkage is as follows.
[0015]
Annealing shrinkage is performed only once in one direction, but thermal expansion / contraction depending on the linear expansion coefficient is repeated. Therefore, stress is repeatedly generated at the rotating end of the lid, and the micro-dent is formed by the small stress. This is because it is likely to occur.
[0016]
Specifically, the annealing rate of the hard resin material is usually 0.5 × 10 ^{−3 to} 1.0 × 10 ⁻³ , and the linear expansion coefficient is 5 × 10 ⁻⁵ ° C. ⁻¹ to 10 × 10 ^{−. 5} ° C. ⁻¹ , annealing rate of soft resin material: 1.0 × 10 ^{−3 to} 3.0 × 10 ⁻³ , linear expansion coefficient: 3 × 10 ⁻⁵ ° C. ^{−1 to} 9 × 10 ⁻⁵ ° C. It shall be ^-1 .
[0017]
Desirably, the annealing rate of the hard resin material and the soft resin material is within 3 times that of the hard resin material, and the linear expansion coefficient is within 2.5 times that of the soft resin material. To do.
[0018]
Specifically, annealing shrinkage of hard resin material: 0.6 × 10 ^{−3 to} 0.8 × 10 ⁻³ , linear expansion coefficient: 8 × 10 ⁻⁵ ° C. ^{−1 to} 9 × 10 ^{− 5} ° C. ⁻¹ , annealing rate of soft resin material: 1.0 × 10 ^{−3 to} 2.0 × 10 ⁻³ , linear expansion coefficient: 3 × 10 ⁻⁵ ° C. ^{−1 to} 7 × 10 ^{− It} shall be ⁵ ° C ^-1 .
[0019]
As the resin material satisfying the above-mentioned annealing shrinkage rate and linear expansion rate, the hard resin material is based on polypropylene (PP) containing a reinforcing inorganic filler, and the soft resin material is based on olefin-based thermoplastic elastomer (TPO). It is desirable to use what to do. This is because it is easy to select material characteristics and contribute to reducing the weight of automobile interior parts.
[0020]
And it is desirable for the automobile interior goods of this invention to apply the coupling | bonding aspect of an interior goods main body and a cover body retainer with the following structures. Compared to adhesive bonding such as adhesives and vibration welding (high frequency / ultrasonic welding), mechanical bonding makes it easier to absorb annealing shrinkage and thermal expansion / shrinkage, and the cover body rotation end is very small. This is because dents are unlikely to occur.
[0021]
A side tear line connecting the pivot end tear line and the hinge tear line along the lid pivot end and the lid hinge to the interior product main body and both tear lines is formed from the back side,
The lid retainer is connected to the hinge outer portion of the lid body portion on the back surface of the interior product main body, and is connected to the back surface of the lid body portion via the curved hinge portion and discontinuous at the rotating end. And a rotating part
A rivet hole group is formed in the rotating part of the lid retainer, and the rivet part is thermally crimped via a rivet pin group protruding from the back surface of the lid part corresponding to the rivet hole group. It is characterized in that it is mechanically (non-adhesively) bonded to the back surface of the plate.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described by taking an instrument panel 12 as shown in FIG. 1 as an example of an automobile interior product having a lid portion for popping out an airbag.
[0023]
The instrument panel 12 has an instrument panel main body (interior product main body) 16 made of a hard resin integrally formed with a pair of front and rear lid portions 14 and 14 so as to be able to open the door, and the back of the front and rear lid portions 14 and 14. A lid retainer (door flap) 20 that is coupled and assembled to the airbag module 18 is provided. The lid retainer 20 is made of a soft resin from the viewpoint of smoothing the hinge action at the front and rear curved hinge portions 22 and 22 and preventing the airbag from being damaged.
[0024]
Here, as the hard resin for molding the instrument panel body 12, one having a flexural modulus (ASTMD790) of 1500 to 3000 MPa, preferably 2000 to 2500 MPa is usually used.
[0025]
For example, PPC (carbon filled polypropylene), PPG (glass fiber filled polypropylene), PC (polycarbonate) / ABS (acrylonitrile / butadiene / styrene terpolymer), PC (polycarbonate), ASG (glass fiber filled allyl), ABS (Acrylonitrile / butadiene / styrene terpolymer), PPE (polyphenylene ether) and the like. Among these hard resins, a fiber-reinforced crystalline polyolefin resin (for example, glass fiber reinforced polypropylene: PPF) or the like can be suitably used from the standpoint of weight reduction.
[0026]
Moreover, as a soft resin which shape | molds the cover body retainer 20, a thing with a bending elastic modulus (ASTMD790) 200-1000MPa, desirably 250-500MPa is used normally.
Similarly to the above, from the viewpoint of weight reduction, non-polar thermoplastic elastomers such as olefin (TPO), 1,2-PB (RB), styrene (TPS) and the like can be suitably used. However, in this embodiment, since the instrument panel body (interior product body) 16 and the lid retainer 20 are not fused (adhered), polyester (TPEE), amide (TPA), urethane (TPU) Polar thermoplastic elastomers such as can also be used.
[0027]
In the present embodiment, the instrument panel body 16 includes front and rear lid parts 14 and 14 for double doors. For this reason, the instrument panel body 12 has an H-shaped front and rear lid parts 14 and 14, the pivot end tear line 24 and the hinge tear lines (scheduled break parts) 26 and 26 along the lid hinges, and both tear lines. Are formed from the back side of the instrument panel body 16. Each tear line 24, 25, 26 is formed from the back side and is not exposed on the front side because of a design requirement (lid portion invisible). The tear lines (scheduled fracture portions) 24, 25, and 26 are usually formed by a cutting means capable of high-accuracy and low-temperature cutting, such as laser, ultrasonic, water cutting (water jet). The cutting depth h at this time is set to 50 to 90%, preferably 60 to 80% of the general thickness. If h is too small, it is difficult to ensure the speed of breakage (airbag deployment performance), and if h is too large, the processing trace of the tear line (scheduled line planned portion) is likely to appear on the design surface (surface) of the instrument panel body. That is, there is a possibility that a tear line processing trace may be seen through the surface. In addition, you may form a fracture | rupture planned line part by a continuous or discontinuous groove part using a slide metal mold | die.
[0028]
The lid retainer 20 is a long plate-like front / rear fixing plate portion (fixing portion) 21, 21 that is coupled to the outer portion of the hinge (hinge tear line 26) of the lid portions 14, 14 on the back surface of the instrument panel body 16. The pair of fixed plate portions 21, 21 coupled to the back surfaces of the lid portions 14, 14 via the curved hinge portions 22, 22 are discontinuous at the rotating ends 14 a, 14 b (having gaps). Front / rear rotation plate portions (rotation portions) 32 and 32. In the present embodiment, front and rear mounting wall portions 28 and 30 that are coupled to the airbag module 18 from the front and rear fixing plate portions are provided. In the illustrated example, the front and rear mounting wall portions 28 and 30 are rectangular boxes with both ends joined, but only the front and rear mounting wall portions 28 and 30 may be used.
[0029]
In this embodiment, the front and rear mounting wall portions 28 and 30 are integrally formed from the standpoint of moldability with the lid retainer 20, but may be two-color molded with a hard resin. It may be an integrally molded product with the instrument panel main body in which the divided mounting wall portions are projected from the main body at a predetermined pitch. Further, in the illustrated example, the curved hinge portion 22 and the rotary plate portion 32 have a single plate configuration over the entire width with respect to the fixed plate portion 21, but only the curved hinge portion 22 and the rotary plate portion 32 or the rotary plate portion 32. It is good also as a division structure.
[0030]
Here, the front and rear curved hinge portions 22 and 22 are separated from the instrument panel main body 16 after the front and rear hinge tear lines 26 and 26 are broken following the breaking of the rotating outer tear line 24. This is to make it easier to escape 14. That is, this is to ensure the deployment performance of the airbag. And, as will be described later, the curved hinge portion does not pull the front and rear opening edges 15a and 15b of the airbag outlet 15 after the lid 14 is separated, as will be described later. A minimum length that can be easily embraced is required. For this reason, when the size (fold length) of the curved hinge portion 22 is larger, the lid portion 14 is easily escaped after the lid portion is separated. That is, it becomes easy to ensure the deployment performance of the airbag (bag body) 42. However, if it is too large, the space occupying ratio of the curved hinge portions 22 and 22 in the bag case 46 of the airbag module 18 increases. That is, it is contrary to the demand for space saving.
[0031]
The top wall thickness of the curved hinge part 22 is thinner than the other part of the curved hinge part 22. The ratio of the thin wall is 30 to 70%, preferably 40 to 60%. If it is too thin, it is difficult to ensure the strength of preventing the lid body from scattering, and if it is too thick, it is difficult to obtain the effect of reducing the thickness of the curved hinge portion 22 (reducing the rotational resistance of the hinge portion).
[0032]
And the rotation plate part (door flap part) 32 of the lid retainer 20 is formed with rivet hole groups 34, 34..., And the lid parts corresponding to the rivet hole groups 34, 34. 14 and 14, and rivet pin groups 36, 36... Protruding from the back surfaces of the 14 and 14, and are coupled to the lid parts 14 and 14. That is, the rotating plate portions 32 and 32 are mechanically (non-adhered) coupled to the back surfaces of the lid portions 14 and 14. Here, the diameters of the rivet holes 34 and the rivet pins 36 in the rivet connection and the number and pitch of the rivet connections are different depending on the required bond strength and the like, for example, the following design.
[0033]
Number of rivets: 42-126 (equal intervals)
Rivet size: width 1.5mm x length 18mm (desirable range width 0.5-2.5mm, length 10-25mm)
The rivet hole groups 34, 34,... And the rivet pin groups 36, 36,. By using the taper coupling, the workability of fitting the rivet hole group and the rivet pin is improved. At this time, the taper angle is usually made to coincide with the die-cutting direction from the viewpoint of instrument panel molding. The diameter of the heat caulking portion when heat caulking is 1.2 to 2 times, preferably about 1.5 times the rivet hole (maximum diameter). Further, the heat caulking temperature varies depending on the type of hard resin for molding the instrument panel body 16, but in the case of PPF, it is set to 180 to 230 ° C.
[0034]
Naturally, the front / rear fixing portions 21 and 21 (outside of the front and rear mounting wall portions 28 and 30) of the lid retainer 20 are located at the hinge outer positions of the lid body portions 14 and 14, respectively. Rivet hole groups 34, 34... Are formed, and heat caulking is performed through rivet pin groups 36, 36... Protruding from the back surface of the instrument panel body 16 in correspondence with the rivet hole groups 34, 34. The instrument panel main body (interior product main body) 16 is coupled.
[0035]
In the present embodiment, the front and rear fixing plate portions 21 and 21 of the lid retainer 21 are connected to the instrument panel body 16 from the viewpoint of the workability of the front and rear fixing plate portions 21 and 21 of the lid retainer 20. Although heat caulking is used, a full or partial fixing method using adhesive bonding such as adhesive or vibration welding (high frequency / ultrasonic welding) may be used.
[0036]
Further, a pair of front and rear engagement holding arms (under-clamping) that embed the rotary plate end portions 32a, 32b from the position of the gap between the rotary plate portions 32, 32 on the back surfaces of the lid portions 14, 14. Part) 38 and 40 are formed at a predetermined pitch at a plurality of locations (four locations in the example). The tear lines (scheduled break portions) 24 and 26 are completely broken, and the lid portions 14 and 14 are hardly subjected to an action of receiving a tearing force from an interface on the rotating end face side of the rotating plate portions 32 and 32 to be detached. It is to do. In the case of a general instrument panel main body (3 mmt), the width and wrap length of the engagement holding arms 38 and 40 are 5 to 15 mm in width and 5 to 15 mm in wrap length.
[0037]
In the instrument panel having the above structure, in this embodiment, the annealing shrinkage of the hard resin material forming the instrument panel body 16 and the soft resin material forming the lid retainer 20 (condition: left at room temperature for 1 day after 80 ° C. for 1 hour; The same applies hereinafter), the soft resin material is within 4 times (preferably within 3 times) of the hard resin material, and the hard resin material is within 3 times (desirably 2.5) of the soft resin material in the same linear expansion coefficient. (Within twice).
[0038]
More specifically, the annealing shrinkage ratio of the hard resin material: 0.5 × 10 ^{−3 to} 1.0 × 10 ⁻³ (preferably 0.6 × 10 ^{−3 to} 0.8 × 10 ⁻³ ), linear expansion coefficient : 5 × 10 ⁻⁵ ° C. ⁻¹ to 10 × 10 ⁻⁵ ° C. ⁻¹ (preferably 8 × 10 ⁻⁵ ° C. ^{−1 to} 9 × 10 ⁻⁵ ° C. ⁻¹ ), and annealing of the soft resin material Rate: 1.0 × 10 ^{−3 to} 3.0 × 10 ⁻³ (preferably 1.0 × 10 ^{−3 to} 2.0 × 10 ⁻³ ), linear expansion coefficient: 3 × 10 ⁻⁵ ° C. ^{−1 to} 9 × 10 ^-5 ° C ^-1 (desirably 3 x 10 ^-5 ° C ^{-1 to} 7 x 10 ^-5 ° C ^-1 ).
[0039]
Here, in a thermoplastic elastomer (TPE) composed of a soft segment and a hard segment, the annealing shrinkage ratio and the linear expansion coefficient are in a proportional relationship (see Table 1). For this reason, the use of a soft material having a low linear expansion coefficient within a range satisfying the requirements of the present invention makes it easier to select a material with a smaller magnification relative to a hard material having an annealing shrinkage rate, and the effect of the present invention is easily achieved.
[0040]
The instrument panel 12 is used by assembling an airbag module 18 and mounting it on an actual vehicle.
[0041]
The airbag module 18 basically includes a bag main body 42, an inflator 44 that allows inflation gas to flow into the bag main body 42, and a bag case 46 that integrates these members. The bag case 46 holds an inflator 44, and a bag retainer 48 that also serves as a diffuser plate that guides inflow of inflation gas is integrated into the bag body 42.
[0042]
Then, the front / rear walls 46a, 46b of the bag case 46 are inserted and engaged with the front / rear mounting walls 28, 30 of the lid retainer 20 formed on the combined back surface of the instrument panel body 20, thereby forming an airbag assembly. It is attached to the vehicle body (actual vehicle) via a bracket (not shown).
[0043]
When an impact load of a predetermined value or more is applied to the vehicle body, the turning end tear line 24, the side tear line 25, and the hinge tear line 26 of the bag lid parts 14, 14 are broken as follows, and the lid part 14, When 14 is separated from the instrument panel body 20 (open door opening) and the air bag outlet 15 is formed, the air bag (bag body 42) is rapidly inflated and deployed.
[0044]
First, the bag main body 42 is pressed to press the instrument panel main body 20 from the back side (lower surface). Then, after stress is concentrated near the center of the H-shaped pivot end tear line 24 in the instrument panel body 20 and breakage occurs, the break is spread to both ends of the pivot end tear line 24, and further to the side tear lines 25, 25. As a result, the lid parts 14 and 14 can be rotated (opening). The lid parts 14 and 14 rotate in the opening direction, and at the same time, stress concentrates and breaks on the hinge tear line 26, so that the lid parts 14 and 14 are separated from the instrument panel body 20. The rotating plate portion 32 of the lid retainer 20 is deployed front and rear (see FIG. 7). At the same time, the curved hinge portion 22 embraces the edge portions 15 a and 15 a of the air bag outlet 15 of the instrument panel body 20 formed by the separation of the lid portion 14.
[0045]
At this time, the rotating plate portion 32 is not in an adhesive state with the lid portion 14 which is a hard resin (substantially rigid body). For this reason, although the rotation plate part 32 is a little relative to the lid part 14, the relative sliding movement is possible, and the flexibility at the lid part coupling part of the rotation plate part 32 is a rigid body made of a hard resin. The lid 14 is not completely restrained. Therefore, the curved hinge portion easily absorbs the impact accompanying the movement of the hinge point, and the working length of the curved hinge portion becomes relatively long, so that the smooth bending motion of the curved hinge portion is easily ensured. Therefore, the rotation plate portion holding the lid portion after the lid portion separation is smoothly rotated, and the airbag (bag main body) is rapidly deployed and inflated. Furthermore, since the curved side of the curved hinge portion 22 is thin, the bending resistance is further reduced, contributing to an increase in rapid deployment of the airbag.
[0046]
In the above-described embodiment, the case where the lid part is double-opened has been taken as an example, but the same applies to the case where the lid part is opened one side. In the case of one-side opening, since only one hinge part is provided, only one fixing plate part is naturally required.
[0047]
[Test example]
In the instrument panel having the structure shown in FIG. 3, the main body and the lid retainer are molded using each material having the physical properties shown in Table 1 (anneal shrinkage, linear expansion, flexural modulus), and after annealing (80 ° C. Visual observation was performed about the generation | occurrence | production of the micro dent of the cover body rotation end site | part in the room temperature 1 day after heat treatment for 1 hour). In addition, each physical property value was quoted from the product physical property table, and crystalline PP was also added as a reference.
[0048]
Moreover, the judgment criteria were as follows.
[0049]
○: No micro-dents are observed at all.
[0050]
Δ: Slight dents are observed depending on the viewing angle.
[0051]
X: A minute dent is recognized regardless of the viewing angle.
[0052]
The results are shown in Table 1. In each of the examples satisfying the requirements of the present invention, no micro dent was observed at all, or a slight micro dent was recognized depending on the viewing angle. On the contrary, in the comparative example that does not satisfy the requirements of the present invention, a micro-dent was clearly generated at the lid rotating end portion.
[0053]
[Table 1]

[Brief description of the drawings]
FIG. 1 is an overall perspective view showing an instrument panel with a lid portion to which the present invention is applied. FIG. 2 is a rear view of a main part in one embodiment of the present invention. 4 is an enlarged cross-sectional view of a part 4 of FIG. 3. FIG. 5 is a cross-sectional view of a part of line 5-5 in FIG. 2. FIG. Sectional view of the model when the air bag jumps out
12 Instrument panel (instrument panel)
14 Lid (open door)
16 Instrument panel body (interior product body)
18 Airbag Module 20 Lid Retainer 22 Curved Hinge Section 24 Rotating End Tear Line 25 Side Tear Line 26 Hinge Tear Line 28 Front Mounting Wall Section 30 Rear Mounting Wall Section 32 Rotating Plate Section 34 Rivet Hole 36 Rivet Pin

Claims (3)

An automobile interior product having a lid for jumping out an airbag,
An interior part body integrally formed of a hard resin material with a lid part together with the other part of the body, and a soft resin material that is substantially immovably associated with the lid part on the back surface of the interior part body While having a configuration with a molded lid retainer ,
The interior product main body is formed with a pivot end tear line and a hinge tear line along the lid pivot end and the lid hinge, respectively, and a side tear line connecting both tear lines from the back side,
The lid retainer is coupled to the back surface of the lid body portion via a curved hinge portion and a fixed portion coupled to the hinge outer portion of the lid body portion on the back surface of the interior body. A rotating part that is discontinuous, and
A rivet hole group is formed in the rotating part of the lid retainer, and the swivel part is thermally crimped via a rivet pin group protruding from the back surface of the lid part corresponding to the rivet hole group. In the configuration that is mechanically (non-adhesively) coupled to the back surface of the lid portion,
The hard resin material is based on polypropylene (PP) containing a reinforcing inorganic filler, and the soft resin material is based on an olefin-based thermoplastic elastomer (TPO).
In the annealing shrinkage of the hard resin material and the soft resin material (condition: 80 ° C. × 1 h after heat treatment, left at room temperature for 1 day; the same applies hereinafter), the soft resin material is within 4 times that of the hard resin material, In the expansion coefficient (JIS K 7197 (−35 ° C. to 110 ° C.); the same applies hereinafter), the hard resin material is within three times the soft resin material , and
Ani of hard resin material - Le ^{shrinkage: 0.5 × 10 -3 ~1.0 × 10} -3, linear expansion coefficient: a ^{5 × 10 -5 ℃ -1 ~10 ×} 10 -5 ℃ -1, Ani of soft resin material - Le ^{shrinkage: 1.0 × 10 -3 ~3.0 × 10} -3, linear expansion coefficient: a ^{3 × 10 -5 ~9 × 10 -5} ℃ -1,
Automotive interior products characterized by this. In the annealing shrinkage rate of the hard resin material and the soft resin material, the soft resin material is within 3 times that of the hard resin material, and the soft resin material is within 2.5 times that of the hard resin material in the linear expansion coefficient . Annealing shrinkage ratio of hard resin material: 0.6 × 10 ^{−3 to} 0.8 × 10 ⁻³ , linear expansion coefficient: 8 × 10 ⁻⁵ ° C. ^{−1 to} 9 × 10 ⁻⁵ ° C. ⁻¹ Annealing shrinkage of the soft resin material: 1.0 × 10 ^{−3 to} 2.0 × 10 ⁻³ , linear expansion coefficient: 3 × 10 ⁻⁵ ° C. ^{−1 to} 7 × 10 ⁻⁵ ° C. ⁻¹ claim 1 automotive interior components, wherein a is. The automobile interior part according to claim 1 or 2, wherein the diameter of the heat crimped portion when heat crimped is 1.2 to 2 times the rivet hole (maximum diameter).

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