JP2004230917A - Interior parts for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the weight and cost of interior parts for an automobile, and to improve the shape holding function and fitting accuracy to a counter part. <P>SOLUTION: A door trim 10 is integrally formed with a light foaming resin base material 20 having a shape holding property and formed into a desirable shape, a resin rib 30 integrated on the inner surface side of the foaming resin base material 20 along the predetermined pattern, a boss 31 provided in a terminal end part of the resin rib 30, a reinforcing rib 32 or a reinforcing rib 33 for reinforcing the terminal end part of the resin rib 30 to reinforce the tensile strength in the boss 31 and the terminal end part of the resin rib 30. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to interior parts for automobiles such as door trims, rear parcel shelves, floor trims, trunk trims, rear side trims, etc., and in particular, can be reduced in weight and can be manufactured at a low cost, and can be adjusted with respect to mating or mounting accuracy with respect to mating parts. It relates to excellent automotive interior parts.
[0002]
[Prior art]
For example, the structure of an interior part for an automobile will be described with reference to FIGS. 15 and 16 by exemplifying a door trim. The door trim 1 is formed by laminating and integrating a skin 3 having an excellent surface appearance on a surface of a resin core material 2 extending over almost the entire product surface having shape retention and rigidity for mounting to a vehicle body panel. .
[0003]
The resin core material 2 is made of a polypropylene-based resin mixed with talc, and the skin 3 itself does not have a shape-retaining property, and a polyethylene foam or the like is formed on the back surface of a synthetic resin sheet such as a PVC sheet. A laminated sheet material in which a cushion material is laminated is used, and recently, a cushion material such as polyethylene foam is laminated on the back surface of an elastomer sheet such as a TPO (thermoplastic olefin) sheet in consideration of the environment and recycling. Sheet materials tend to be heavily used.
[0004]
Next, a conventional example of a method of forming the door trim 1 will be described with reference to FIG. First, a molding die 4 for molding the door trim 1 is connected to a molding upper die 5 that can move up and down by a predetermined stroke, a fixed lower molding die 6 that forms a pair with the molding upper die 5, and a molding lower die 6. It is generally constituted by an injection machine 7.
[0005]
When the upper and lower molds 5 and 6 are clamped, a cavity 5a is formed in the upper mold 5 and a core 6a is provided in the lower mold 6 to form the product shape of the door trim 1. I have. In order to move the upper molding die 5 up and down by a predetermined stroke, an elevating cylinder 5b is connected, and the lower molding die 6 is provided with a manifold 6b and a gate 6c that serve as a passage for the molten resin from the injection machine 7.
[0006]
The upper mold 5 that moves up and down is provided with guide posts 6d at four corners of the lower mold 6 in order to maintain a proper posture, and the upper mold 5 corresponds to the guide posts 6d. A bush 5c is provided.
[0007]
Therefore, when the upper and lower molds 5 and 6 are in the mold open state, the skin 3 is set in the mold, and thereafter, either immediately before or after the mold upper and lower molds 5 and 6 are clamped. The resin core material 2 is formed into a required shape by injection-filling the molten resin M from the injection machine 7 through the manifold 6b and the gate 6c into the product cavity between the two molds at the timing, and the surface of the resin core material 2 is formed. The skin 3 is integrally formed (for example, see Patent Document 1).
[0008]
In FIG. 17, for convenience of explanation, the molten resin M is supplied to the mold surface of the core portion 6a in an open state, but as described above, the molten resin M is supplied to the cavity after the molding upper and lower dies 5, 6 are clamped. It may be filled by injection.
[0009]
[Patent Document 1]
JP-A-10-138268 (page 2, FIG. 3, FIG. 4)
[0010]
[Problems to be solved by the invention]
However, it has been pointed out that the conventional door trim 1 has a problem that the projected area of the resin core 2 is large, so that the material cost is high and the product is heavy.
[0011]
In addition, since the projected area of the resin core material 2 is large, the injection pressure at the time of molding must be set high, and a mold structure that can withstand the high injection pressure is required. In addition, since a large amount of molten resin is cooled and solidified, the molding cycle is prolonged, which is a major factor in lowering productivity.
[0012]
The present invention has been made in view of such circumstances, and it is possible to provide an automobile interior part which can promote weight reduction, achieve high rigidity and reduce cost, and further, has a high shape holding function, and It is an object of the present invention to provide an automobile interior part with improved alignment accuracy or mounting accuracy.
[0013]
[Means for Solving the Problems]
The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result of imparting shape retention to a foamed resin sheet conventionally used as a skin, have a function as a core material. High rigidity is required at places where rigidity is required, that is, at the peripheral part of the product, at the panel, where it can be closely contacted with the mating part, or at a place where a certain clearance is secured, or where parts are attached and where a load is applied. In addition to responding by arranging the resin ribs, in particular, by increasing the tensile strength of the boss provided at the end portion of the resin rib or at the end portion of the resin rib, the shape maintaining function, the alignment accuracy with the mating component, or The inventors have found that the mounting accuracy is improved, and have completed the present invention.
[0014]
That is, the automotive interior part according to the present invention is molded into a required shape, is a lightweight and shape-retaining foamed resin base material, and a resin along a predetermined pattern shape integrated on the back surface of the foamed resin base material. An automotive interior component comprising a rib and a boss provided at a terminal portion of the resin rib, wherein the boss located at the terminal portion of the resin rib has a direction substantially orthogonal to an extending direction of the resin rib. And a reinforcing structure for complementing the tensile strength along the line is provided.
[0015]
Here, as interior parts for automobiles, door trim, rear parcel shelf, floor trim, luggage trim, trunk trim, rear side trim, and the like can be applied.
[0016]
When the foamed resin base material having shape retention properties is close to a flat shape, the heating softening step is omitted, and the molded resin is molded into a desired shape. Is heat-softened and then molded into the required shape in a molding die, so that it has a rigidity (shape retention) that maintains its shape even after removal from the mold, even if there is no reinforcing material such as ribs. have. If the product shape includes a high expansion rate, the foamed resin sheet is heated and softened, and then a vacuum suction mechanism is arranged in the molding die to vacuum-suction the foamed resin sheet along the inner surface of the molding die. A force may be applied.
[0017]
As the foamed resin sheet, a material obtained by adding a foaming agent to a thermoplastic resin is used. Incidentally, the thermoplastic resin may be composed of one kind of thermoplastic resin or two or more kinds of thermoplastic resins. Preferably, polyethylene resin, polypropylene resin, polystyrene resin, polyethylene terephthalate resin, polyvinyl alcohol resin, vinyl chloride resin, ionomer resin, acrylonitrile / butadiene / styrene (ABS) resin and the like can be used.
[0018]
As the foaming agent, an organic foaming agent such as an azo compound, a sulfohydrazide compound, a nitroso compound, and an azide compound, or an inorganic foaming agent such as sodium bicarbonate can be used.
[0019]
The foamed resin substrate obtained by molding the foamed resin sheet into a required shape after the heat softening treatment has a foaming ratio of 2 to 10 times in consideration of the balance between the weight and the strength of the product. The cell diameter of the foamed resin substrate at that time is preferably in the range of 0.1 μm to 2.0 mm, and the thickness is preferably 0.5 to 30 mm, and more preferably 1 to 10 mm.
[0020]
On the other hand, the thermoplastic resin material used as the resin rib can be appropriately selected from a wide range of thermoplastic resins. Usually preferred are polyethylene resins, polypropylene resins, polystyrene resins, polyethylene terephthalate resins, polyvinyl alcohol resins, vinyl chloride resins, ionomer resins, polyamide resins, acrylonitrile / butadiene / styrene (ABS). Resin, polycarbonate resin and the like can be used.
[0021]
Various fillers may be mixed in these thermoplastic resins. Examples of the filler that can be used include inorganic fibers such as glass fiber and carbon fiber, and inorganic particles such as talc, clay, silica, and calcium carbonate. Further, various additives such as an antioxidant, an ultraviolet absorber, a coloring agent, a flame retardant, and a low shrinkage agent may be blended.
[0022]
Further, a boss is provided at an intermediate portion (crossing portion or the like) of the resin rib or a terminal portion of the resin rib. The boss is a boss for a body panel, a boss for attaching a mating component, and the like. Although the boss located at the end portion of the resin ribs satisfies the tensile strength along the extending direction of the resin rib, the tensile strength along the direction substantially perpendicular to the extending direction of the resin rib tends to be weak. A reinforcing structure is adopted for the boss located at the end.
[0023]
As this reinforcing structure, for example, a structure in which a plate-shaped reinforcing rib is integrated with the outer peripheral surface of the boss along a direction substantially perpendicular to the extending direction of the resin rib, or a reinforcing boss is provided at the tip of the reinforcing rib. A structure to be attached is conceivable.
[0024]
Next, another embodiment of the automotive interior part according to the present invention is formed into a required shape, is lightweight and has a shape-retaining foamed resin base material, and is integrated with the back side of the foamed resin base material. An automotive interior part comprising a resin rib along a predetermined pattern, wherein a reinforcing structure for complementing a tensile strength substantially perpendicular to an extending direction of the resin rib is provided at an end portion of the resin rib. I do.
[0025]
In this case as well, the terminal end portion of the resin rib satisfies the tensile strength along the extending direction of the resin rib, but in particular, the terminal portion has low tensile strength along the direction substantially perpendicular to the extending direction of the rib. Because of this tendency, it is preferable to provide a reinforcing structure at the end portion of the resin rib in order to ensure the shape stability of the resin rib.
[0026]
As the reinforcing structure at the terminal portion of the resin rib, a T-shaped or cross-shaped reinforcing rib is provided in a direction substantially orthogonal to the extending direction of the resin rib, or a reinforcing boss is integrated with the terminal portion of the resin rib. Can be considered.
[0027]
In order to enhance the appearance design, a decorative material may be laminated and integrated on the surface of the foamed resin substrate. As the decorating material, a woven fabric, a nonwoven fabric, a knitted fabric, a sheet, a film, a foam, a net, and the like can be used. Although the material constituting these decorative materials is not particularly limited, it is better to use a material having air permeability such as woven fabric, nonwoven fabric, knitted fabric, etc. Is preferred.
[0028]
According to the automotive interior part according to the present invention, the resin ribs are laminated and integrated on the back side of the foamed resin base material having shape-retaining property in order to reinforce rigidity. The core material can be eliminated. Therefore, by eliminating the conventional resin core material having a very large projected area, the weight of the product can be reduced, and the resin material can be saved, so that the material cost can be reduced at the same time.
[0029]
Furthermore, since the boss integrated with the resin rib end portion or the plate-shaped reinforcing rib or the reinforcing boss is integrated with the end portion of the resin rib, the boss provided at the end portion of the resin rib or the resin rib is provided. Since the end portion of the resin rib can enhance the tensile strength in the direction substantially perpendicular to the extending direction of the resin rib, the end portion of the boss or the resin rib is not deformed, so that the matching with the partner component can be performed with high accuracy. At the same time, it becomes excellent in shape stability.
[0030]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of an interior part for an automobile according to the present invention will be described by exemplifying an automobile door trim.
[0031]
1 to 10 show a first embodiment of the present invention. FIG. 1 is a front view showing an automobile door trim, FIG. 2 is a cross-sectional view showing a configuration of the automobile door trim, and FIG. 3 is a resin in the automobile door trim. FIG. 4 is an explanatory view showing a rib arrangement pattern, FIG. 4 is an explanatory view showing a direction of a pulling force applied to a boss provided at a resin rib terminal portion in the vehicle door trim, and FIGS. 5 to 8 are provided at a resin rib terminal portion. 9 and 10 show a method of manufacturing the automobile door trim, and FIG. 9 is an explanatory view showing a process of setting a foamed resin sheet in a molding die, and FIG. It is explanatory drawing which shows the molding process of a door trim.
[0032]
FIGS. 11 to 14 show a second embodiment of the present invention. FIG. 11 is an explanatory view showing an arrangement pattern of resin ribs in a door trim, and FIG. 12 shows a direction of a pulling force applied to a resin rib end portion. FIGS. 13 and 14 are explanatory views showing a reinforcing structure provided at the end portion of the resin rib.
[0033]
First, the configuration of the vehicle door trim 10 will be described with reference to FIGS. In the vehicle door trim 10 according to the present embodiment, an accessory such as an inside handle escutcheon 11, a power window switch finisher 13 and a pull handle 14 are attached to an armrest portion 12, and a pocket opening 15 is provided below the armrest portion 12. A pocket escutcheon 16 is fitted and fixed around the pocket opening 15, and a speaker grill 17 is provided integrally or separately on the front side of the pocket opening 15.
[0034]
More specifically, as shown in FIG. 2, the main body of the automobile door trim 10 is molded into a required shape, is lightweight and has a shape-retaining property, and a back side of the foamed resin substrate 20. And a decorating material 21 having a decorating function, which is laminated and integrated on the surface side of the foamed resin base material 20.
[0035]
Further, the foamed resin base material 20 is subjected to heat softening treatment of the foamed resin sheet so as to have shape retention properties, and then thermoformed into a required shape, for example, cold press molding with a molding die having a desired mold surface. Further, the foamed resin base material 20 may be shaped by vacuum molding for a portion having a higher expansion rate. In the case of a flat component such as a lid component such as a jack lid, the foamed resin sheet can be formed into a flat shape without performing a heat softening treatment.
[0036]
The foamed resin sheet has a configuration in which a foaming agent is added to a general-purpose thermoplastic resin. Examples of the thermoplastic resin include polyethylene resin, polypropylene resin, polystyrene resin, polyethylene terephthalate resin, polyvinyl alcohol resin, and chloride resin. A vinyl resin, an ionomer resin, an acrylonitrile / butadiene / styrene (ABS) resin or the like can be used. As a foaming agent, an organic foaming agent such as azodicarbonamide or an inorganic foaming agent such as sodium bicarbonate can be used. In this embodiment, a foamed resin sheet obtained by appropriately adding sodium bicarbonate as a foaming agent to a polypropylene resin is used. The expansion ratio of the foamed resin base material 20 is set to 2 to 10 times, and the thickness is set to 0.5 to 30 mm, particularly 1 to 10 mm.
[0037]
Next, the resin ribs 30 are arranged on the back surface side of the foamed resin base material 20, and are particularly set in a lattice pattern extending in the vertical and horizontal directions as shown in FIG. The resin rib 30 is made of a general-purpose synthetic resin molded body, and is preferably a synthetic resin that can be preferably used as a polyethylene resin, a polypropylene resin, a polystyrene resin, a polyethylene terephthalate resin, a polyvinyl alcohol resin, a vinyl chloride resin, The resin may be appropriately selected from an ionomer resin, a polyamide resin, an acrylonitrile / butadiene / styrene (ABS) resin, a polycarbonate resin, and the like. In the present embodiment, a polypropylene resin is used in consideration of the environment and recycling. .
[0038]
In addition, fillers such as inorganic fibers such as glass fibers and carbon fibers and fillers such as inorganic particles such as talc, clay, silica and calcium carbonate are mixed into the thermoplastic ribs. May be.
[0039]
Further, in the present embodiment, a boss 31 is provided on the resin rib 30 for abutting the vehicle body panel or for attaching another component such as a door pocket backing plate at an end portion or an intersection of the resin rib 30. Have been.
[0040]
By the way, as shown in FIG. 4, the boss 31 integrated with the terminal end portion of the resin rib 30 has a tensile strength along the extending direction of the resin rib 30 (the direction indicated by (a) in the figure). Although it is integrated with the rib 30, it has stable strength, but a direction (direction shown by (b) in the figure) perpendicular to the extending direction of this resin rib 30 (direction shown by (a) in the figure) The tensile strength along the line is not satisfactory, and therefore, the accuracy of the mating parts tends to vary, complicating the mounting work, and deforming, resulting in the accuracy of fitting to the vehicle body panel or other parts. However, there was a problem that the mounting accuracy with respect to was difficult to manage.
[0041]
For this purpose, for example, as shown in FIG. 5, in order to supplement the tensile strength, plate-shaped reinforcing ribs 32 are provided on the outer peripheral surface of the boss 31 on both sides along a direction substantially orthogonal to the extending direction of the resin ribs 30. It is integrated so as to extend. The reinforcing ribs 32 may be set so as to have a Y-shape as a whole, and the reinforcing ribs 32 need not necessarily intersect the resin ribs 30 in an orthogonal state.
[0042]
As a result, the tensile strength along each of the directions (a) and (b) shown in FIG. 4 is sufficiently satisfactory, and the deformation of the boss 31 can be prevented as much as possible. The alignment accuracy and mounting accuracy with respect to the panel can be improved.
[0043]
Further, by integrating a reinforcing boss 33 at the tip of the reinforcing rib 32 as shown in FIG. 6, deformation in a direction perpendicular to the extending direction of the reinforcing rib 32 is prevented, thereby providing a stronger reinforcing structure. Can be adopted.
[0044]
As described above, the door trim 10 in the present embodiment is formed from the foamed resin base material 20 which is formed into a required shape, is lightweight and has shape retention properties, and the resin rib 30 which is integrated with the back surface of the foamed resin base material 20. Since it is configured, the resin core material occupying the entire surface of the product can be eliminated as in the related art, and the weight of the product is smaller than that of the conventional example because the lightweight foamed resin base material 20 is used. There is an advantage that the weight can be reduced by 40% or more, the resin material can be largely saved, and the cost can be greatly reduced.
[0045]
Furthermore, since the foamed resin substrate 20 has a porous structure, it has excellent sound absorbing performance, and can effectively absorb noise inside and outside the vehicle. Further, in order to enhance the sound absorbing performance of the foamed resin base material 20 especially for the noise in the passenger compartment, the decorative material 21 laminated and integrated on the surface of the foamed resin base material 20 is made of a woven fabric, a nonwoven fabric, a knitted fabric, or the like. A sheet material having air permeability is preferable. The decorative material 21 may use a synthetic resin sheet such as a PVC sheet or a TPO sheet, a synthetic resin film, a foam, or a knitted body, in addition to a breathable sheet such as a woven fabric, a nonwoven fabric, and a knitted fabric. it can. In addition, if a TPO sheet is used, the materials used can be unified with a polyolefin resin, so that recycling can be performed easily.
[0046]
Further, the boss 31 provided at the end portion of the resin rib 30 employs a plate-shaped reinforcing rib 32 or a reinforcing structure in which a reinforcing boss 33 is further integrated at the tip of the reinforcing rib 32, thereby enabling deformation of the boss 31. Since it is possible to improve the shape stability and the accuracy of fitting to the mating part or the vehicle body panel, or to improve the mounting accuracy, there is an advantage that the mounting workability for mounting the door trim 10 can be improved.
[0047]
Further, the variation of the reinforcing rib 32 may be changed as shown in FIGS.
[0048]
That is, FIG. 7 shows that the reinforcing ribs 32 are formed at an angle with respect to the boss 31 provided at the terminal end portion of the resin rib 30 so that the reinforcing rib 32 is not perpendicular to the resin rib 30 but is formed in a substantially Y shape. It is attached. Therefore, since the reinforcing ribs 32 shown in FIG. 7 need only have two directions, there is an advantage that the structure can be simplified.
[0049]
Further, FIG. 8 shows that the reinforcing ribs 32 are attached to the boss 31 provided at the end portion of the resin rib 30 in three directions of the extending direction and the substantially orthogonal direction of the resin rib 30, and the tip of the reinforcing rib 32. And a reinforcing rib 32a is further provided in a direction substantially orthogonal to the reinforcing rib 32. Therefore, a stronger reinforcing structure can be provided.
[0050]
Next, an outline of a method of manufacturing the door trim 10 will be briefly described with reference to FIGS. In FIG. 9, a molding die 40 used for molding the door trim 10 includes a molding upper die 41 which can move up and down by a predetermined stroke, a fixed lower molding die 42 paired with the molding upper die 41, and a molding lower die 42. And an injection machine 43 connected to the main body.
[0051]
More specifically, the upper molding die 41 is formed with a cavity 411 conforming to the product shape, and is driven up and down by a predetermined stroke by an elevating cylinder 412 connected to the upper surface of the upper molding die 41. At four corners of the upper mold 41, guide bushes 413 serving as a guide mechanism are provided.
[0052]
On the other hand, the lower molding die 42 is provided with a core portion 421 corresponding to the cavity portion 411 of the upper molding die 41. Further, in order to supply the molten resin to the mold surface of the core portion 421, the lower mold 42 is provided with a manifold 422 and a gate 423, and the injection machine 43 receives the resin from the manifold 422 and the gate 423. The supplied molten resin M is supplied to the groove 424 on the upper surface of the core 421.
[0053]
Guide posts 425 serving as a guide mechanism project from four corners of the lower molding die 42. The guide posts 425 are guided into the guide bush 413 when the upper and lower molding dies 41 and 42 are clamped. Thus, the pressing posture of the upper mold 41 can be properly maintained.
[0054]
First, as shown in FIG. 9, the foamed resin sheet S (on which the decorative material 21 is laminated) subjected to the heat softening treatment is set in the molding die 40. In this embodiment, as the foamed resin sheet S, a polypropylene foam sheet (manufactured by Sumika Plustech Co., Ltd., trade name: Sumiceller foamed PP sheet, foaming ratio = 3 times, thickness 3 mm) is used. The resin sheet S is supplied into the molding upper and lower dies 41 and 42 in a state where the resin sheet S has been heated and softened to 130 ° C.
[0055]
Then, after setting the foamed resin sheet S, the elevating cylinder 412 of the upper molding die 41 is operated, and as shown in FIG. By tightening, the foamed resin sheet S is shaped along a desired mold surface shape, the foamed resin base material 20 is molded, and the core portion 421 of the lower molding die 42 through the manifold 422 and the gate 423 from the injection machine 43. The molten resin M is injected and filled into the groove portion 424 provided in the base material, and the resin rib 30 is integrally formed on the inner surface side of the foamed resin base material 20. Further, a boss hole for forming the boss 31, a reinforcing rib, a groove for forming a reinforcing boss, and a boss hole are provided so as to communicate with the groove 424. In addition, as this molten resin M, talc is appropriately mixed in Sumitomo Noblen BUE81E6 (polypropylene manufactured by Sumitomo Chemical Co., Ltd., melt index = 65 g / 10 min). The injection timing of the molten resin M may be set before the upper and lower molds 41 and 42 are clamped.
[0056]
Next, FIGS. 11 to 14 show a second embodiment of the present invention, in which the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0057]
In the second embodiment, as shown in FIG. 11, in the configuration of the resin rib 30, the resin rib 30 from which the boss 31 is omitted is located at the terminal portion, and the resin rib 30 is provided at the terminal portion of the resin rib 30. The reinforcing ribs 32 are integrated along a direction substantially orthogonal to the extending direction of.
[0058]
Also in this embodiment, as shown in FIG. 12, the terminal end portion of the resin rib 30 extends along the direction perpendicular to the direction in which the resin rib 30 extends (the direction indicated by (b) in the drawing). In order to prevent the bending deformation, a plate-like reinforcing rib 32 is integrated with the terminal end of the resin rib 30 as shown in FIG. 13 or a resin rib 30 is formed as shown in FIG. The reinforcement structure which integrates the reinforcement boss 33 at the end part of is adopted.
[0059]
Therefore, the resin ribs 30 have sufficient tensile strength in the extending direction of the resin ribs 30 and are orthogonal to the extending direction of the resin ribs 30 which is considered to be relatively weak in structure. Regarding the tensile strength in the direction (the direction indicated by (b) in FIG. 10), since the reinforcing ribs 32 and the reinforcing bosses 33 are formed, no bending deformation occurs at the end portion of the resin rib 30 and the shape maintaining function is provided. There is an advantage that it can be maintained well.
[0060]
【The invention's effect】
As described above, the automotive interior part according to the present invention includes a lightweight and shape-retaining foamed resin base material, a resin rib laminated and integrated on the back surface of the foamed resin base material, and a resin rib terminal portion. Or a reinforcing rib or a reinforcing boss that reinforces the boss at the terminal end, so that the conventional heavy and heavy resin core material can be abolished. This has the effect of providing interior parts for automobiles with excellent performance.
[0061]
Furthermore, in the automotive interior part according to the present invention, the resin ribs along a predetermined pattern shape integrated on the back surface of the foamed resin base material are provided with bosses provided at the end portions thereof, or reinforcing ribs at the end portions of the resin ribs, or Since the reinforcement structure that integrates the reinforcement boss is adopted, the deformation of the boss and the terminal end of the resin rib can be reliably prevented, so that it does not deform even if excessive external force is applied, and the initial shape can be maintained for a long time. This has the effect of being able to stably maintain and improve the reliability of the mounting accuracy and alignment accuracy with respect to the mating part and the vehicle body panel.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of an automobile door trim to which an automobile interior part according to the present invention is applied.
FIG. 2 is a sectional view taken along line II-II in FIG.
FIG. 3 is an explanatory diagram showing an arrangement pattern of resin ribs in the door trim shown in FIG.
FIG. 4 is an explanatory view showing directions of a pulling force applied to a boss provided at a resin rib end portion shown in FIG. 3;
FIG. 5 is a perspective view showing one embodiment of a boss reinforcement structure provided at a resin rib terminal portion shown in FIG. 3;
6 is a perspective view showing a modified example of the boss reinforcement structure provided at the end portion of the resin rib shown in FIG. 3;
FIG. 7 is a perspective view showing a further modified example of the reinforcing structure of the boss provided at the end portion of the resin rib shown in FIG.
FIG. 8 is a perspective view showing a further modified example of the boss reinforcing structure provided at the resin rib end portion shown in FIG.
FIG. 9 is an explanatory view showing a setting step of a foamed resin sheet in the manufacturing method of the door trim shown in FIG. 1;
FIG. 10 is an explanatory view showing a forming step in the method for manufacturing the door trim shown in FIG. 1;
FIG. 11 is an explanatory view showing an arrangement pattern of resin ribs in another embodiment in which the automobile interior part according to the present invention is applied to a door trim.
FIG. 12 is an explanatory view showing the direction of a pulling force applied to a resin rib end portion shown in FIG. 11;
13 is a perspective view showing a configuration in which a reinforcing plate is integrated with a resin rib end portion shown in FIG.
FIG. 14 is a perspective view showing a configuration in which a reinforcing boss is integrated with a resin rib end portion shown in FIG. 11;
FIG. 15 is a front view showing a conventional automobile door trim.
FIG. 16 is a sectional view taken along line XVI-XVI in FIG. 15;
FIG. 17 is a schematic diagram showing a molding process of a conventional door trim.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Car door trim 11 Inside handle escutsion 12 Armrest part 13 Power window switch finisher 14 Pull handle 15 Pocket opening 16 Pocket escutcheon 17 Speaker grill 20 Foam resin base material 21 Decorating material 30 Resin rib 31 Boss 32, 32a Reinforcement rib 33 Reinforcement boss Reference Signs List 40 Molding die 41 Molding upper mold 42 Molding lower mold 43 Injection machine S Foamed resin sheet M Molten resin

Claims (7)

A foamed resin base material (20) formed into a required shape and having a lightweight and shape-retaining property, and a resin rib (30) along a predetermined pattern shape integrated with the back surface of the foamed resin base material (20) And a boss (31) provided at the end of the resin rib (30).
The boss (31) located at the end of the resin rib (30) is provided with a reinforcing structure that complements the tensile strength along a direction substantially perpendicular to the direction in which the resin rib (30) extends. Characteristic automotive interior parts. The reinforcing structure includes a plate-shaped reinforcing rib (32) extending from an outer peripheral surface of a boss (31) located at a terminal portion of the resin rib (30) in a direction substantially perpendicular to an extending direction of the resin rib (30). The automotive interior part according to claim 1, wherein the interior part is integrated. The interior part according to claim 2, wherein a reinforcing boss (33) is integrated with a terminal portion of the reinforcing rib (32). A foamed resin base material (20), which is molded into a required shape, is lightweight and has shape retention properties, and a resin rib (30) along a predetermined pattern integrated on the back side of the foamed resin base material (20) Automotive interior parts (10)
An interior part for an automobile, wherein a reinforcing structure for complementing a tensile strength substantially perpendicular to an extending direction of the resin rib (30) is provided at an end portion of the resin rib (30). The reinforcing structure is characterized in that a plate-shaped reinforcing rib (32) extending in a direction substantially perpendicular to the extending direction of the resin rib (30) is integrated with a terminal portion of the resin rib (30). An automotive interior part according to claim 4. The interior part according to claim 4, wherein the reinforcement structure comprises a reinforcement boss (33) integrated with a terminal portion of the resin rib (30). 7. An interior part for an automobile according to any one of claims 1 to 6, wherein a decorative material (21) having a decorative property is laminated and integrated on the surface of the foamed resin substrate (20). .

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