JP6969306B2 - Vehicle door trim - Google Patents

Description

The present invention relates to a vehicle door trim.

As a door trim superstructure of a vehicle door, the configuration disclosed in Patent Document 1 below is known. In the configuration disclosed in Patent Document 1, the door trim is made of a resin injection molded product, and a large number of ribs for reinforcing the upper end edge are extended on the lower surface side of the upper end edge in a direction intersecting the longitudinal direction of the upper end edge. ing.

Further, as a door trim, the configuration disclosed in Patent Document 2 below is known. The door trim of Patent Document 1 includes a trim board containing a thermoplastic resin and a bracket molded in a state of being joined to the trim board. Then, in the trim board, the plate thickness of the first peripheral portion located around the joint with the bracket is smaller than the plate thickness of the second peripheral portion located around the first peripheral portion, and the plate thickness of the first peripheral portion is smaller. The density is supposed to be higher than the density of the second peripheral portion. Further, it is described that according to such a configuration, it is possible to suppress a situation in which the molten resin reaches (leaks) around the joint portion at the time of bracket molding.

Japanese Unexamined Patent Publication No. 2013-2490117 Japanese Unexamined Patent Publication No. 2013-091287

By the way, when a plurality of ribs as disclosed in Patent Document 1 are molded like a bracket disclosed in Patent Document 2, a runner connecting a plurality of rib forming spaces for forming the plurality of ribs is provided. It is conceivable to supply the resin to a plurality of rib forming spaces via a runner. In such a case, as a measure against resin leakage during molding, it is desired to reduce the plate thickness not only around each rib molding space but also around the runner.

However, in a plate-shaped base material such as a trim board, there is a problem that a portion having a smaller plate thickness than a general portion is likely to be locally bent and deformed. In the configuration in which the portion of the base material having a small plate thickness is extended linearly in the front-rear direction of the vehicle, an external force acts, for example, the occupant puts an elbow on the upper edge of the vehicle door trim. In this case, stress is concentrated on the portion where the plate thickness is small, and the base material is easily deformed in the vertical direction of the vehicle. For this reason, there is a possibility that sufficient rigidity cannot be secured with the vehicle door trim in which the plate thickness around the runner is reduced, and there is room for improvement.

The technique disclosed in the present specification has been completed based on the above circumstances, and an object thereof is to suppress deformation of the base material in the vertical direction of the vehicle and to secure the rigidity of the door trim for the vehicle. And.

In order to solve the above problems, the vehicle door trim of the technique disclosed in the present specification is joined to a plate-shaped base material in which fibers are bound by a thermoplastic resin and one plate surface of the base material. A resin molded body is provided, and the resin molded body includes a plurality of ribs that are parallel to each other in the vehicle front-rear direction and extend in parallel to each other in a direction intersecting the vehicle front-rear direction, and a rib connecting portion that connects the plurality of ribs. The base material is located around the joint portion between the general portion, the resin molded body, and the portion of the joint portion to be joined to the rib joint portion, and the plate thickness is smaller than that of the general portion. It has a thin plate portion, and the thin plate portion extends in the front-rear direction of the vehicle while bending toward the upper side of the vehicle or the lower side of the vehicle.

According to such a vehicle door trim, the thin plate portion is linear in the front-rear direction of the vehicle when a force is applied to the base material from the outside toward the lower side of the vehicle, for example, by placing an elbow on the occupant. The stress applied to the thin plate portion can be dispersed to the upper side of the vehicle or the lower side of the vehicle as compared with the configuration extending to the above. As a result, the base material is less likely to be deformed in the vertical direction of the vehicle as compared with the base material provided with the linear thin plate portion, and the rigidity of the door trim for the vehicle can be sufficiently ensured.

In the above configuration, the thin plate portion may be extended in a wavy shape in the front-rear direction of the vehicle. According to such a configuration, the rigidity of the door trim can be suitably improved.

In the above configuration, the base material further has a plurality of rib-side thin plate portions, each of which is located around a portion of the joint portion to be joined to the plurality of ribs and whose plate thickness is smaller than that of the general portion. The thin plate portions may be extended in a wavy shape at a constant pitch and may be arranged so as to diagonally intersect each of the plurality of rib-side thin plate portions. According to such a configuration, for example, the lengths of the plurality of ribs are longer than those in which the thin plate portion is extended in a crank shape and arranged so as to be orthogonal to each of the plurality of rib side thin plate portions. It is easy to make the dimensions equal. Therefore, by making the length dimensions of the plurality of ribs the same, the shrinkage amount of the resin at the time of forming each rib can be made uniform, and the situation where the base material is unintentionally deformed can be suppressed. .. Further, it is easy to sufficiently secure the length dimension of each rib, and the rigidity of the door trim can be suitably improved by the plurality of ribs.

In the above configuration, the thin plate portion may be extended in a crank shape in the front-rear direction of the vehicle. According to such a configuration, the rigidity of the door trim can be suitably improved.

According to the technique disclosed in the present specification, it is possible to suppress the deformation of the base material in the vertical direction of the vehicle and ensure the rigidity of the door trim for the vehicle.

Front view showing the door trim according to the first embodiment Cross-sectional view of the vehicle door (corresponding to the view cut along line II-II in FIG. 1) Plan view of the resin molded body as viewed from the outside of the passenger compartment Cross-sectional view of the trim board (corresponding to the view cut along the IV-IV line in FIG. 3) Sectional drawing which shows the molding apparatus in the mold open state of a pair of molding dies A cross-sectional view showing a molding apparatus in a closed state of a pair of molding dies. A plan view of the resin molded body according to the second embodiment as viewed from the outside of the vehicle interior. A plan view of the resin molded body according to the comparative example as viewed from the outside of the passenger compartment. Graph showing the result of rigidity evaluation test

<Embodiment 1>
The first embodiment will be described with reference to FIGS. 1 to 6. In the present embodiment, the door trim 20 (vehicle door trim), which is attached to the vehicle interior side of the door panel 11 and constitutes the vehicle interior side surface of the vehicle door 10, is exemplified. In the following description, the left side of the paper in FIG. 1, the right side of the paper in FIG. 3 is the front of the vehicle, the right side of the paper in FIG. 1, the left side of the paper in FIG. 3 is the rear of the vehicle, and the upper side of the paper in FIGS. In addition, each part will be described with the lower side of the paper in FIGS. 1 and 3 as the lower side of the vehicle.

As shown in FIG. 2, the door panel 11 includes a door outer panel 11A and a door inner panel 11B, which have a panel shape, respectively. These panels 11A and 11B are made of metal and are formed by pressing a metal plate material such as iron or aluminum. An inner weather strip 13 is attached to the upper end of the vehicle on the door inner panel 11B. The inner weather strip 13 is provided with a locked portion 13A locked to a locking portion 45, which will be described later, so as to open toward the vehicle interior.

As shown in FIG. 2, the door trim 20 has a main surface portion 21 constituting a main surface facing the vehicle interior side, and an upper edge portion 23 rising from the upper portion of the main surface portion 21 toward the outside of the vehicle interior. .. The upper edge portion 23 has a curved portion 24 having a curved shape in a portion connected to the main surface portion 21. The upper edge portion 23 is a portion also called a shoulder portion located below the window included in the vehicle door 10. It can be said that the upper edge portion 23 is a portion where a load is easily applied from the outside by assuming that the occupant seated on the seat puts his / her elbow on the seat and puts his / her hand when opening / closing the vehicle door 10. Further, the door trim 20 is provided with a door inside handle hole 25 for attaching a door inside handle (not shown), an armrest 26, a door pocket 27, and the like (see FIG. 1).

As shown in FIG. 2, the door trim 20 is mainly composed of the trim board 30. The trim board 30 includes a plate-shaped base material 31 and a resin molded body 40 provided on the surface 31B (one plate surface) on the outer side of the vehicle interior of the base material 31. In the present embodiment, the trim board 30 constitutes the upper portion of the door trim 20, and has a plurality of resin molded bodies 40 along the upper edge portion 23. Further, the trim board 30 has another resin molded body 50 having a structure different from that of the resin molded body 40 along the upper edge portion 23 (see FIG. 1). The other resin molded body 50 is configured to have a linear rib connecting portion that connects two ribs. Further, the skin material 29 is attached to the trim board 30 so as to cover the surface 31A on the vehicle interior side of the base material 31.

The base material 31 has a structure in which fibers are bound by a thermoplastic resin. Examples of the fiber include wood fiber obtained by weaving wood and the like, bast plant fiber such as kenaf, and fiber selected from inorganic fiber such as glass fiber and carbon fiber. As the thermoplastic resin, polypropylene can be exemplified. The base material 31 is molded from a preboard 39 containing fibers and a thermoplastic resin as described below. The configuration of each part of the base material 31 will be described later.

The resin molded body 40 is integrally formed of a thermoplastic resin such as polypropylene. As shown in FIG. 3, the resin molded body 40 has a plurality of ribs 41 and a rib connecting portion 43 connecting the plurality of ribs 41. The rib connecting portion 43 is a portion made of a molten resin 67 in a runner 73 for supplying a resin material to the rib forming space 71 described later, and is also referred to as a runner trace (runner portion) (see FIG. 6). ). In the present embodiment, the resin molded body 40 further has a locking portion 45 that is locked to the locked portion 13A as another molded component to which the molten resin 67 is supplied via the runner 73. (See Fig. 2). In FIG. 3, the locking portion 45 is omitted, and the plurality of ribs 41 and the rib connecting portions 43 of the resin molded body 40 are schematically drawn.

As shown in FIG. 3, the plurality of ribs 41 are arranged in parallel in the vehicle front-rear direction and extend in parallel with each other in the direction intersecting the vehicle front-rear direction. In the present embodiment, the plurality of ribs 41 are configured to extend in parallel with each other in the vertical direction of the vehicle at the curved portion 24 of the upper edge portion 23. With such a configuration, it is possible to reinforce the upper edge portion 23 (curved portion 24) and increase the rigidity of the door trim 20.

As shown in FIG. 3, the plurality of ribs 41 are configured to include the first rib 41A, the second rib 41B, and the third rib 41C arranged in order from the rear of the vehicle. The first rib 41A, the second rib 41B, and the third rib 41C are arranged in parallel with substantially the same spacing. The positions of the upper ends of the first rib 41A, the second rib 41B, and the third rib 41C are almost the same in the vertical direction of the vehicle, but the positions of the lower ends are the second rib 41B and the third rib 41B from the first rib 41A. The rib 41C is located above the vehicle. The second rib 41B and the third rib 41C have a smaller length dimension than the first rib 41A and have the same length dimension as each other.

As shown in FIGS. 2 and 3, the rib connecting portion 43 has a ridge shape protruding from the surface 31B on the outer side of the vehicle interior of the base material 31, and is configured to be connected to the lower end portion of each of the plurality of ribs 41. ing. In the present embodiment, the rib connecting portion 43 is extended in a crank shape in the front-rear direction of the vehicle. Specifically, the rib connecting portion 43 extends from the lower end portion of the first rib 41A toward the front of the vehicle, bends upward in the vehicle directly below the second rib 41B, and further, the lower end portion of the second rib 41B. It bends to the rear of the vehicle and extends to the lower end of the third rib 41C. The position where the rib connecting portion 43 connects the plurality of ribs 41 is not limited to the lower end portions thereof, but in the configuration in which the plurality of ribs 41 are formed on the curved portion 24 as in the present embodiment, molding is performed. From the viewpoint of sex, it is preferable that the position is relatively close to the main surface portion 21.

As shown in FIG. 4, the base material 31 is located around a joint portion 34 between the general portion 32 and the resin molded body 40, and a portion of the joint portion 34 that is joined to the rib connecting portion 43, and is a general portion. A plurality of rib-side thin plate portions 38 having a thickness smaller than that of the general portion 32 and a plurality of rib-side thin plate portions 38 located around a portion of the joint portion 34 to be joined to the plurality of ribs 41 and having a plate thickness smaller than that of the general portion 32 (see FIG. 3). ) And. In addition, in FIGS. 3 and 4, the region where the thin plate portion 36 and the rib side thin plate portion 38 are formed is shaded.

As shown in FIGS. 3 and 4, the general portion 32 is a plate-shaped portion having a predetermined plate thickness located around the thin plate portion 36 and the plurality of rib-side thin plate portions 38 in the base material 31, and is a base. It occupies most of the material 31. On the other hand, the thin plate portion 36 and the rib-side thin plate portion 38 are locally formed in a band-shaped region having a constant width extending along the joint portion 34.

As shown in FIG. 4, the joint portion 34 is a portion to which the resin molded body 40 is fixed to the base material 31. Specifically, the joint portion 34 is partially impregnated with the molten resin 67 for molding the resin molded body 40 at the time of molding the resin molded body 40, and resin molding is performed by the anchor effect and the welding effect of the solidified resin. The body 40 is fixed.

As shown in FIG. 4, the thin plate portion 36 is a portion compressed in the plate thickness direction more than the general portion 32, and has a density (weight of fiber and thermoplastic resin per unit volume) as compared with the general portion 32. ) Is a high-density part. The thin plate portion 36 is arranged so as to surround the rib connecting portion 43 with a predetermined width dimension. With such a configuration, it is possible to suppress a situation in which the molten resin 67 in the runner 73 leaks around the joint portion 34. The structure of the rib-side thin plate portion 38 is the same as that of the thin plate portion 36, and the description thereof will be omitted.

Specifically, the plate thickness of the thin plate portion 36 is 60% or less based on the plate thickness of the general portion 32. Further, the width dimension of the thin plate portion 36 (the dimension from the outer peripheral end of the rib connecting portion 43 to the end on the opposite side to the outer peripheral end) is set to be equal to or larger than the plate thickness of the thin plate portion 36. The thin plate portion 36 is formed so as to dent the surface 31B on the outer side of the vehicle interior of the base material 31. The plate thickness of the base material 31 gradually decreases from the general portion 32 toward the thin plate portion 36. The surface of the thin plate portion 36 on the vehicle interior side is a flat surface having no unevenness, and is covered with the skin material 29 to form the design surface of the door trim 20.

As shown in FIG. 3, the thin plate portion 36 is extended in the front-rear direction of the vehicle while bending toward the upper side of the vehicle or the lower side of the vehicle. In the present embodiment, the thin plate portion 36 is extended in a crank shape in the front-rear direction of the vehicle. In other words, the thin plate portion 36 includes a portion extending so as to extend perpendicularly to the vehicle front-rear direction. In other words, the thin plate portion 36 includes a lower thin plate portion relatively arranged on the lower side of the vehicle and an upper thin plate portion relatively arranged on the upper side of the vehicle in the vehicle front-rear direction. Specifically, in the thin plate portion 36, the lower thin plate portion extends from the lower end portion of the first rib 41A to directly below the second rib 41B toward the front of the vehicle, and the upper thin plate portion is the lower end portion of the second rib 41B. It extends from to the lower end of the third rib 41C. Then, the front end portion of the lower thin plate portion and the rear end portion of the upper thin plate portion are connected by a vertical thin plate portion extending in the vertical direction of the vehicle immediately below the second rib 41B.

As shown in FIG. 3, each of the plurality of rib-side thin plate portions 38 has a strip shape and is arranged so as to be connected to the side of the strip-shaped thin plate portion 36. The plurality of rib-side thin plate portions 38 are arranged apart from each other in the front-rear direction of the vehicle, and are configured to extend in parallel with each other. Of the plurality of rib-side thin plate portions 38, the rib-side thin plate portion 38 formed around the second rib 41B and the third rib 41C is longer than the rib-side thin plate portion 38 formed around the first rib 41A. The dimensions are short. The thin plate portion 36 is arranged so as to be orthogonal to each of the plurality of rib-side thin plate portions 38.

Next, the molding apparatus 60 for manufacturing the door trim 20 will be described with reference to FIGS. 5 and 6. The molding apparatus 60 is an injection press molding apparatus and includes a pair of molding dies 61 and 70 and an injection apparatus 65. In the present embodiment, the molding die 61 arranged on the upper side is a cavity mold for molding the surface 31A on the vehicle interior side of the base material 31, and the molding mold 70 arranged on the lower side is the outside of the vehicle interior of the base material 31. An example is a core mold for forming the surface 31B. The injection device 65 is, for example, a screw type, and is provided in the molding mold 70 in the present embodiment. Further, the molding mold 70 is configured to further include a slide mold and the like (not shown) in order to mold the locking portion 45 having the undercut portion.

The mold 61 is a movable mold that can be moved with respect to the mold 70 by a drive device (for example, an electric motor, an air cylinder, a hydraulic cylinder, etc.) (not shown). The pair of molding dies 61 and 70 have a configuration in which the molding dies 61 can be closed and opened by moving the molding dies 61 closer to and apart from the molding dies 70.

As shown in FIG. 1, the molding dies 70 are arranged to face the forming dies 61 so as to be separated from each other by the plate thickness of the base material 31 in the closed state. As a result, a base material molding space for molding the base material 31 is formed between the mold 61 and the mold 70. When the preboard 39 is pressed by the molding die 61 and the molding die 70, the preboard 39 is compressed into a shape corresponding to the shape of the base material molding space, and as a result, the base material 31 is molded.

On the molding surface 70A of the molding die 70, a plurality of rib molding spaces 71 for molding the plurality of ribs 41 and a plurality of rib molding spaces 71 are communicated with each other, and the molten resin 67 is supplied to each rib molding space 71. The runner 73 for the purpose is recessed. The runner 73 is connected to the nozzle of the injection device 65 in the vicinity of the central portion thereof. With such a configuration, the molten resin 67 can be injected from one injection device 65 into a plurality of rib forming spaces 71 via the runner 73. The rib molding space 71 and the runner 73 are communicated with the base material molding space, and by injecting the molten resin 67 into the rib molding space 71 and the runner 73, the resin molded body 40 is molded in a state of being bonded to the base material 31. NS.

On the molding surface 70A of the molding die 70, a protruding portion 75 protruding toward the molding die 61 is formed around the rib forming space 71 and the runner 73. The protruding portion 75 is for molding the thin plate portion 36 and the rib side thin plate portion 38 of the base material 31, and the shape of the protruding end surface is shown with shading in FIG. 3 for the thin plate portion 36 and the rib side. It corresponds to the shape of the thin plate portion 38.

Next, a method of manufacturing the door trim 20 by the molding apparatus 60 will be described with reference to FIGS. 5 and 6. The method for manufacturing the door trim 20 in the present embodiment is based on a pre-board molding step of molding the pre-board 39, a base material molding step of press-molding the base material 31 from the pre-board 39 with the molding dies 61 and 70, and the molding dies 61 and 70. It is provided with a molded body molding step of injecting a resin molded body 40 bonded to the base material 31 in a state where the material 31 is pressed.

In the pre-board forming step, a mat material in which fibers and a thermoplastic resin are mixed is heated to form a flat plate. Then, the pre-board 39 is obtained by cutting the molded flat plate-shaped molded product to a predetermined length (for example, a dimension longer than the length dimension of the base material 31 after molding). The plate thickness and density of the preboard 39 are made to be substantially uniform in the plate surface direction.

In the base material molding step, the preboard 39 is heated again to the extent that polypropylene is melted and softened, set in the mold 70, and the mold 61 and the mold 70 are closed. As a result, the base material 31 is press-molded from the pre-board 39 by the molding dies 61 and 70. At the time of closing the mold, the peripheral end portion of the preboard 39 may be cut by shearing with the molding molds 61 and 70.

In the base material forming step, the base material 31 is press-molded so that the plate thickness of the thin plate portion 36 is smaller than the plate thickness of the general portion 32. Further, in the present embodiment, in the base material forming step, the base material 31 is press-molded so that the plate thickness of the rib-side thin plate portion 38 is smaller than the plate thickness of the general portion 32 as well as the plate thickness of the thin plate portion 36. do. At this time, the pre-board 39 has a portion facing the protruding portion 75 in the molding die 70 (a portion corresponding to the thin plate portion 36 and the rib-side thin plate portion 38) and a portion facing a flat portion other than the protruding portion 75 (general). A higher press pressure is applied as compared with the portion corresponding to the portion 32). As a result, the thin plate portion 36 and the rib side thin plate portion 38 are compressed to a state of higher density than the general portion 32, and a gap is provided between the molding die 70 (protruding portion 75) and the thin plate portion 36 and the rib side thin plate portion 38. Is less likely to occur. In the base material forming step, the portions of the preboard 39 facing the rib forming space 71 and the runner 73 are in a state of being relatively raised from the surroundings (thin plate portion 36 and rib side thin plate portion 38). This raised portion becomes a joint portion 34 of the base material 31 with the resin molded body 40.

In the molding step, the molten resin 67 is injected from the injection device 65 into the rib molding space 71 via the runner 73 with the molding molds 61 and 70 closed. Specifically, the molten resin 67 that has flowed into the runner 73 from the injection device 65 flows toward the front of the vehicle and the rear of the vehicle along the extending direction of the runner 73. In the present embodiment, the runner 73 is extended in a crank shape and may be inferior in fluidity at the bent portion or the like as compared with the linear runner 73. However, the shape of the runner 73 is taken into consideration. Therefore, various molding conditions are appropriately set. Then, the molten resin 67 flowing through the runner 73 flows into each rib forming space 71 branched from the runner 73, and is filled in the rib forming space 71.

The injected molten resin 67 penetrates into the fiber while pushing the softened thermoplastic resin inside the base material 31 at the joint portion 34. The molten resin 67 that has penetrated into the fiber partially mixes with the softened thermoplastic resin inside the base material 31. At this time, since the thin plate portion 36 and the rib-side thin plate portion 38 located around the joint portion 34 in the base material 31 are in a higher density state than the general portion 32, the relevant portion is tentatively the same as the general portion 32. The molten resin 67 that has penetrated into the joint portion 34 is less likely to spread to the thin plate portion 36 or the rib side thin plate portion 38 side as compared with the configuration having the density of. Further, the thin plate portion 36 and the rib side thin plate portion 38 are configured so that a gap is unlikely to be formed between the thin plate portion 36 and the rib side thin plate portion 38, and the molten resin 67 is unlikely to leak from such a gap. ..

Next, the molten resin 67 filled in the rib forming space 71 and the runner 73 is cooled and solidified. Then, injection molding is performed in a state where the plurality of ribs 41 and the rib connecting portions 43 are joined to the base material 31. After that, the molding dies 61 and 70 are opened and demolded to obtain a trim board 30 in which the base material 31 and the resin molded body 40 are integrally formed. Then, the production of the door trim 20 is completed through a step of attaching the skin material 29 to the trim board 30, a step of attaching various functional parts, and the like.

Subsequently, the effect of this embodiment will be described. According to the present embodiment, for example, when an occupant places an elbow on the upper edge portion 23 and a force is applied to the base material 31 from the outside toward the lower side of the vehicle, the thin plate portion moves in the front-rear direction of the vehicle. The stress applied to the thin plate portion 36 can be dispersed to the upper side of the vehicle or the lower side of the vehicle as compared with the configuration in which the thin plate portion 36 is extended linearly. As a result, the base material 31 is less likely to be deformed in the vertical direction of the vehicle as compared with the base material provided with the linear thin plate portion, and the rigidity of the door trim 20 can be sufficiently ensured.

Further, in the present embodiment, the thin plate portion 36 is extended in a crank shape in the front-rear direction of the vehicle. Therefore, the rigidity of the door trim 20 can be suitably improved.

<Embodiment 2>
Embodiment 2 of the present invention will be described with reference to FIG. In the present embodiment, the configurations of the resin molded body 140 and the thin plate portion 136 are different from those of the resin molded body 40 and the thin plate portion 136 of the first embodiment. The same parts as those in the above embodiment are designated by the same reference numerals, and duplicate description will be omitted.

The plurality of ribs 141 are configured to include a first rib 141A, a second rib 141B, and a third rib 141C arranged in order from the rear of the vehicle. The first rib 141A, the second rib 141B, and the third rib 141C are arranged in parallel with substantially the same spacing. The first rib 141A, the second rib 141B, and the third rib 141C have substantially the same positions of the upper end portion and the lower end portion in the vertical direction of the vehicle, and have the same length dimension as each other.

The rib connecting portion 143 has a ridge shape protruding from the surface 31B on the outer side of the vehicle interior of the base material 31, and is configured to be continuous with each lower end portion of the plurality of ribs 141. In the present embodiment, the rib connecting portion 143 is extended in a wavy shape at a constant pitch in the front-rear direction of the vehicle. Specifically, the rib connecting portion 143 draws a sine-curve-like locus having a wavelength equivalent to the distance between the plurality of ribs 141, and bends twice between the ribs 141 adjacent to each other (mountain-shaped portion). It has a valley-shaped part). The rib connecting portion 143 is configured to be connected so as to diagonally intersect each of the plurality of ribs 141. The position where the rib connecting portion 143 connects the plurality of ribs 141 is not limited to the lower end portion of the plurality of ribs 141, but in the configuration in which the plurality of ribs 141 are formed in the curved portion 24 as in the present embodiment. Is preferably located relatively close to the main surface portion 21 from the viewpoint of moldability.

The thin plate portion 136 is extended in the front-rear direction of the vehicle while bending toward the upper side of the vehicle or the lower side of the vehicle. In the present embodiment, the thin plate portion 136 is extended in a wavy shape with a constant pitch in the front-rear direction of the vehicle. In other words, the thin plate portion 136 includes a portion extending so as to extend diagonally with respect to the vehicle front-rear direction. Further, in other words, the thin plate portion 136 includes a lower thin plate portion relatively arranged on the lower side of the vehicle and an upper thin plate portion relatively arranged on the upper side of the vehicle in the vehicle front-rear direction. Specifically, in the thin plate portion 136, the lower thin plate portion extends in a valley shape below the lower end portion of the plurality of ribs 141, and the upper thin plate portion extends in a mountain shape above the lower end portion of the plurality of ribs 141. It is extended to.

Each of the plurality of rib-side thin plate portions 38 has a strip shape and is arranged so as to be connected to the side of the strip-shaped thin plate portion 136. The plurality of rib-side thin plate portions 38 are arranged apart from each other in the front-rear direction of the vehicle, and are configured to extend in parallel with each other. Each of the plurality of rib-side thin plate portions 38 has the same length dimension as each other. The thin plate portions 136 are arranged so as to diagonally intersect each of the plurality of rib-side thin plate portions 38.

Subsequently, the effect of this embodiment will be described. According to the present embodiment, the thin plate portion 136 is extended in a wavy shape in the front-rear direction of the vehicle. Therefore, the rigidity of the door trim 20 can be suitably improved. Further, according to the present embodiment, the rigidity of the door trim 20 can be suitably improved as compared with the thin plate portion 36 extended in a crank shape as in the first embodiment.

Further, according to the present embodiment, the thin plate portions 136 are extended in a wavy shape at a constant pitch and are arranged so as to diagonally intersect each of the plurality of rib-side thin plate portions 38. Therefore, for example, the lengths of the plurality of ribs 141 are longer than those of the configuration extending in a crank shape like the thin plate portion 36 and arranged so as to be orthogonal to each of the plurality of rib side thin plate portions 38. It is easy to make the dimensions equal. Therefore, by making the length dimensions of the plurality of ribs 141 equal, the shrinkage amount of the resin at the time of molding each of the ribs 141A, 141B, 141C can be made uniform, and the base material 31 is unintentionally deformed. The situation can be suppressed. Further, it is easy to sufficiently secure the length dimension of each rib 141A, 141B, 141C, and the base material 31 can be suitably reinforced by the plurality of ribs 141.

Hereinafter, the present invention will be further described based on examples. The present invention is not limited to these examples.

[1] Preparation of test piece (1) Comparative example As a comparative example, as shown in FIG. 8, the base material has three ribs 1 having the same length dimension, and the three ribs 1 have three ribs 1. A test piece having two resin molded bodies 4 having a lower end portion connected by a linear rib connecting portion 3 was prepared. In this base material, the thin plate portion 6 is extended linearly. In the base material, the plate thickness of the general portion is about 2.3 mm, the plate thickness of the thin plate portion 6 is about 1.3 mm, and the thin plate portion 6 surrounds the rib connecting portion 3 with a width dimension of about 5 mm. It was configured.
(2) Example 1
As the first embodiment, as shown in FIG. 3, the length dimension of the two ribs 41B and 41C is reduced by about 20 mm as compared with the rib 1 of the comparative example, and the lower end portion of the three ribs 41 is cranked. A test piece including two resin molded bodies 40 connected by a rib connecting portion 43 in the shape of a rib was prepared. The base material 31 has a thin plate portion 36 extended in a crank shape. Other configurations in Example 1 were the same as those in Comparative Example.
(3) Example 2
As a second embodiment, as shown in FIG. 7, the three ribs 141 having the same length as the comparative example are provided, and the lower ends of the three ribs 141 are connected by a wavy rib connecting portion 143. A test piece including two resin molded bodies 140 was prepared. The waveform of the rib connecting portion 143 has a wavelength (about 60 mm) equivalent to the distance between the adjacent ribs 141, and the amplitude thereof is about 15 mm. In this base material 31, the thin plate portion 136 is extended in a wavy shape. Other configurations in Example 2 were the same as those in Comparative Example.

[2] Rigidity evaluation (1) Rigidity evaluation test For each of the five test pieces obtained in the above [1] (1) to (3), the ribs are arranged vertically in the horizontal direction with respect to the base material. The amount of deformation of the base material when a force of 49 N was applied in the direction was measured. The results are shown in the table of FIG. The average value of the amount of deformation of the base material was 4.5 mm / 49N in Comparative Example, 3.0 mm / 49N in Example 1, and 2.3 mm / 49N in Example 2.
(2) Rigidity evaluation of Example 1 According to the rigidity evaluation test, in Example 1, although the length dimensions of some of the ribs 41B and 41C are smaller than those of the comparative example, the rigidity of the base material 31 is high. It was confirmed that. In the comparative example, stress was collected in the linear thin plate portion 6 and the thin plate portion 6 was the starting point to cause bending deformation. However, in the first embodiment, the stress related to the thin plate portion 36 was applied to the vehicle as compared with the comparative example. It can be inferred that this is because the amount of deflection and deformation starting from the thin plate portion 36 is reduced by being dispersed in the upper part or the lower part of the vehicle.
(3) Rigidity evaluation of Example 2 According to the rigidity evaluation test, in Example 2, the rigidity of the base material 31 is higher than that of Comparative Example, and further, the rigidity of the base material 31 is higher than that of Example 1. It was confirmed. In the comparative example, stress was collected in the linear thin plate portion 6 and the thin plate portion 6 was used as a starting point to cause bending deformation. However, in the second embodiment, the stress related to the thin plate portion 136 was higher than that in the comparative example. It can be inferred that the amount of deflection and deformation starting from the thin plate portion 136 was reduced by being dispersed in the upper part or the lower part of the vehicle. Further, in Example 2, since the number of places where stress is dispersed (the part that bends above or below the vehicle) is increased as compared with Example 1, the stress acting on the thin plate portion 136 is further dispersed, and Example 1 It can be inferred that the amount of deflection deformation starting from the thin plate portion 136 was reduced. Further, in the second embodiment, it is not necessary to reduce the length dimension of some of the ribs 41B and 41C as in the first embodiment, and the effect of reinforcing the base material 31 by the rib 141 is higher than that of the first embodiment. it is conceivable that.

<Other embodiments>
The present invention is not limited to the embodiments described above and the drawings, and for example, the following embodiments are also included in the technical scope of the present invention.

(1) In addition to the above embodiment, the arrangement and the number of arrangements of the resin molded body in the door trim can be appropriately changed. For example, the technique disclosed in the present specification is also effective in a configuration in which the resin molded body is arranged on the main surface portion of the door trim. Further, the arrangement of the rib connecting portion can be appropriately set in consideration of the formability, the arrangement configuration of other structures in the door trim, and the like.
(2) In the above embodiment, the resin molded body is provided with three ribs, and the rib connecting portion is extended in a crank shape or a wavy shape, but the present invention is not limited to this. For example, the number of ribs connected to each other by the rib connecting portion may be two or four or more. Further, the shape of the rib connecting portion can be appropriately changed, and for example, the rib connecting portion may be extended in a wavy shape having no constant pitch.
(3) In the above embodiment, the configuration in which the thin plate portion surrounds the rib connecting portion with a predetermined width dimension is exemplified, but the present invention is not limited to this. For example, the thin plate portion surrounds the rib connecting portion with different width dimensions, and the bending shape of the rib connecting portion is gentler than the bending shape in which the thin plate portion bends toward the upper side of the vehicle or the lower side of the vehicle. May be. Further, the thin plate portion and the rib-side thin plate portion may be configured to surround only a part of the joint portion without surrounding the entire circumference.
(4) In the above embodiment, the configuration including the rib-side thin plate portion is exemplified, but the configuration may not include the rib-side thin plate portion. Further, the shape and arrangement of the rib-side thin plate portion can be changed as appropriate.
(5) In the above embodiment, a molding apparatus in which the lower mold is a fixed mold is exemplified, but the present invention is not limited to this. Further, the molding apparatus and the manufacturing method of the molded structure can be appropriately changed according to the shape, material and the like of the molded structure.

20 ... Door trim (vehicle door trim), 31 ... Base material, 31B ... Vehicle interior outer surface (one plate surface), 32 ... General part, 34 ... Joint part, 36, 136 ... Thin plate part, 38 ... Rib side thin plate Part, 40, 140 ... Resin molded body, 41, 141 ... Rib, 43, 143 ... Rib connecting part

Claims (5)

A plate-shaped base material in which fibers are bound by a thermoplastic resin,
A resin molded body bonded to one of the plate surfaces of the base material is provided.
The resin molded body has a plurality of ribs that are parallel to each other in the vehicle front-rear direction and extend in parallel to each other in a direction intersecting the vehicle front-rear direction, and a rib connecting portion that connects the plurality of ribs.
The base material is located around a joint portion between a general portion and the resin molded body, and a portion of the joint portion to be joined to the rib joint portion, and has a thin plate portion having a smaller plate thickness than the general portion. Have,
The base material has a main surface portion constituting a main surface facing the vehicle interior side and a curved portion forming a curved shape from an upper portion of the main surface portion to a portion connected to the main surface portion, and rises toward the outside of the vehicle interior. Has an edge, and
The plurality of ribs are provided in the curved portion, and the lower end portions of the adjacent ribs include those connected by the rib connecting portion and those not connected by the rib connecting portion.
The thin plate portion is extended in the front-rear direction of the vehicle while bending toward the upper side of the vehicle or the lower side of the vehicle, and the lower end portions of the adjacent ribs are formed in a portion connected by the rib connecting portion, and the adjacent ribs of the adjacent ribs are formed. A vehicle door trim that is not formed in the portion where the lower end portion is not connected by the rib connecting portion. The vehicle door trim according to claim 1, wherein the thin plate portion extends in a wavy shape in the front-rear direction of the vehicle. The thin plate portion includes a lower thin plate portion relatively arranged on the lower side of the vehicle in the front-rear direction of the vehicle and an upper thin plate portion relatively arranged on the upper side of the vehicle.
A claim that the lower thin plate portion extends in a valley shape below the lower end portion of the plurality of ribs, and the upper thin plate portion extends in a mountain shape above the lower end portion of the plurality of ribs in a mountain shape. Item 2. The vehicle door trim according to item 2. The base material is further located around a portion of the joint portion to be joined to the plurality of ribs, and further has a plurality of rib-side thin plate portions having a plate thickness smaller than that of the general portion.
The vehicle according to claim 2 or 3 , wherein the thin plate portions are extended in a wavy shape at a constant pitch and are arranged so as to diagonally intersect each of the plurality of rib-side thin plate portions. For door trim. The plurality of ribs include those having different length dimensions in the vertical direction.
The vehicle door trim according to claim 1, wherein the thin plate portion extends in a crank shape in the front-rear direction of the vehicle.

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