JP3575096B2 - Door trim shock absorbing structure and method of manufacturing the same - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a shock absorbing structure for a door trim, and more particularly, to a shock absorbing structure at the waist or shoulder, which is a bulging portion of the door trim, to absorb impact energy at the time of a side collision and to ensure the safety of the occupant's human body. The present invention relates to an improvement in the structure to be performed.
[0002]
[Prior art]
As a conventional shock absorbing structure for this type of door trim, there is a technique shown in FIG.
[0003]
FIG. 9 is a sectional view showing a conventional shock absorbing structure of a door trim.
[0004]
As shown in FIG. 9, the conventional shock absorbing structure of the door trim includes a waist shock absorbing member 101 provided in the waist 21 of the door trim 20 and a shoulder shock absorbing member 103 provided in the shoulder 22. Become. Each of the two shock absorbing members 101 and 103 is formed of urethane foam in a block shape having a mounting surface corresponding to an inner surface shape of a mounting portion.
[0005]
Next, the impact absorbing structure of the conventional door trim configured as described above absorbs the impact energy applied to the occupant in the vehicle from the side of the vehicle at the time of a side collision of the vehicle to avoid occupant damage, Ensure passive safety.
[0006]
Here, instead of the urethane foam-type impact absorbing structure, a type of impact absorbing structure in which a number of resin ribs are provided in the door trim 20 has been proposed for the purpose of reducing manufacturing costs.
[0007]
FIG. 10 is a perspective view showing a shock absorbing structure of a door trim of a resin rib type manufactured by injection molding. FIG. 11 is a sectional view taken along line AA of FIG. FIG. 12 is a perspective view showing the insert of the mold for the shock absorbing structure of the door trim of FIG. FIG. 13 is a sectional view showing a change in the thickness of the shock absorbing structure of the door trim manufactured by the mold using the insert shown in FIG.
[0008]
As shown in FIGS. 10 and 11, the shock absorbing structure of the door trim includes an outer wall portion 111 formed in a square cylindrical shape interposed between the door trim 20 and the inner panel 11 of the door 10, and an outer wall portion 111. And a bottom wall 112 (rear side in FIG. 10) that closes the bottom surface. In the internal space surrounded by the outer wall portion 111 and the bottom wall 112, a number of flat plate-shaped ribs 113 are integrally formed so as to intersect with each other in a lattice pattern. It is divided into a large number of square pillar-shaped small chambers 114 each having one end closed by a wall 112.
[0009]
The shock absorbing structure of the door trim configured as described above is interposed between the door trim 20, for example, between the door trim 20 and the inner panel 11 of the door 10 or the ornament board 13 on the inner panel 11. Occasionally, the small chamber 114 allows the outer wall 111 and the rib 113 to be crushed, thereby absorbing the collision energy transmitted from the side of the vehicle and preventing an occupant near the door trim 20 from being impacted.
[0010]
The shock absorbing structure of the door trim configured as described above is manufactured by injection molding. That is, the cavity of the injection mold is formed in a shape corresponding to the outer surfaces of the outer wall 111 and the bottom wall 112, and as shown in FIG. The block 131 has a shape arranged vertically and horizontally in the plane direction, the cavity and the core are clamped, and a predetermined resin material is injected and filled into a molding space between the cavity and the core. To form
[0011]
As shown in FIG. 13, each rib 113 of the shock absorbing structure manufactured as described above has a plate thickness change t-θ due to a draft angle.
[0012]
[Problems to be solved by the invention]
Since the shock absorbing structure shown in FIG. 10 is manufactured by injection molding as described above, the arrangement configuration of the large number of ribs 113 and the configuration of the ribs 113 are changed according to differences in specifications such as shapes and dimensions due to differences in vehicle types and the like. When it is necessary to change dimensions such as plate thickness and rib depth, it is necessary to prepare a cavity and a core having different shapes for each specification. The production of the cavity and the core of the injection mold requires a lot of cost and labor, and the work of replacing the cavity and the core of the mold in accordance with the above-mentioned change of the specification requires a lot of labor. Need. Therefore, when the above-described shock absorbing structure is manufactured by injection molding, the manufacturing cost increases, and the shape, plate thickness, dimensions, and the like of the rib 113 are not easily changed. There is room for improvement in terms.
[0013]
Furthermore, in the case of injection molding, each rib 113 has a thickness change t-θ due to a draft angle. However, it is better to eliminate the thickness change t-θ and make the thickness constant to reduce the product quality and the like. preferable.
[0014]
Therefore, the present invention is configured by arranging a large number of ribs in an intersecting manner, has a large degree of freedom in shape, is easy to change, and easily changes dimensions such as plate thickness and depth of each rib. It is an object of the present invention to provide a shock absorbing structure of a door trim that can be used.
[0015]
[Means for Solving the Problems]
The shock absorbing structure of the door trim according to the first aspect of the present invention provides an outer wall formed in a substantially cylindrical shape interposed between the door trim and the door panel by extrusion, and an inner space of the outer wall by extrusion. An inner wall formed by integrally arranging a number of ribs in an inner space of the outer wall so as to be divided into a number of small chambers communicating from one end to the other end;A resin clip composed of a pair of flexible pieces is integrally formed, and is disposed inside a door trim that sandwiches the corresponding outer wall or inner wall and holds the outer wall and the inner wall in a fixed position on the inner surface. With an ornament boardIs provided.
[0016]
The resin clip comprising the pair of flexible pieces of the shock absorbing structure for a door trim according to the second aspect of the present invention has a hook-like shape with the distal ends facing each other.
[0017]
Claim3The method for manufacturing a shock absorbing structure of a door trim according to the invention is characterized in that a resin material is extruded from a die having a net-like flat extrusion port, and a plurality of ribs extending in the extrusion direction are integrally formed in an inner space of a substantially cylindrical outer wall portion. An extruding step of forming a long resin having a large number of small chambers communicating with each other in an extruding direction and cutting the long resin into a predetermined length interposed between a door trim and a door panel. Cutting process andA press forming step of heating and pressing the cut end surface of the long resin after cutting to obtain a desired curved shape;Is provided.
[0018]
Claim4The manufacturing method of the shock absorbing structure of the door trim according to the invention of claim3In the invention, the long resin extruded from the die is taken at a predetermined take-up speed, and the thickness of the long resin is changed by changing the ratio of the take-up speed to the extrusion speed of the long resin.
[0019]
[Action]
According to the first aspect of the present invention, in the event of a side collision of the vehicle, the small chambers allow the ribs of the plate-shaped outer wall and the inner wall to be crushed, thereby absorbing and mitigating the collision energy transmitted from the side of the vehicle, thereby reducing the door trim. Prevent impact on nearby passengers.
[0020]
Here, since the outer wall portion and the inner wall portion formed by intersecting a number of ribs in the outer wall portion are integrally formed by extrusion molding, if the shape needs to be changed, the die of the extruder is changed. The shape of the outer wall and the inner wall can be easily changed only by changing the shape of the extrusion port. Further, by changing the ratio between the extrusion speed and the take-up speed of the long resin extruded from the extrusion port, the thickness of the ribs on the outer wall and the inner wall can be easily changed. Further, the rib depth can be easily changed by changing the cutting length of the long resin extruded from the extrusion port. Therefore, the degree of freedom of the shape of the outer wall portion and the inner wall portion is large, the shape can be easily changed, and the dimensional changes such as the plate thickness and the rib depth can be easily performed.
Further, a resin clip made of a pair of flexible pieces is integrally formed with an ornament board disposed inside the door trim, and sandwiches the corresponding outer wall or inner wall, and connects the outer wall and the inner wall to the inner surface. , It is possible to reliably absorb the collision energy transmitted from the side of the vehicle and prevent an impact on the occupant near the door trim.
[0021]
According to the second aspect of the present invention, since the resin clip made of a pair of flexible pieces has a hook-like shape with the ends thereof opposed, the collision energy transmitted from the side of the vehicle is reliably absorbed, and the door trim is provided. It is possible to prevent an impact on a nearby occupant, and to improve the reliability.
[0022]
Claim3According to the invention, in the extrusion step, a long resin having a shape in which a large number of small chambers communicating with the extrusion direction are formed by integrally arranging a large number of ribs extending in the extrusion direction in the internal space of the substantially cylindrical outer wall portion in an intersecting manner. Is obtained. Thereafter, in the cutting step, when the long resin is cut at a predetermined length, a plurality of ribs are integrally intersected in the internal space of the outer wall to form a resin having a predetermined thickness at a predetermined rib depth at which the inner wall is formed. A shock absorbing structure as a molded product is obtained. Here, when it is necessary to change the overall shape, that is, the cross-sectional shape of the outer wall and the inner wall, the shape of the outer wall and the inner wall can be easily changed only by changing the die and changing the shape of the extrusion opening. Further, by changing the cutting length of the long resin extruded from the extrusion port, the rib depth can be easily changed. Therefore, the degree of freedom of the shapes of the outer wall portion and the inner wall portion can be increased, the shapes can be easily changed, and the dimensions such as the rib depth can be easily changed.Then, the long resin after cutting is heated and pressed to form a desired curved shape on the end face, so that the end face can be formed into a desired shape corresponding to the shape of the mounting portion of the door trim.
[0023]
Claim4Claim of the invention3In addition to the above invention, the thickness of the ribs on the outer wall and the inner wall can be easily changed by changing the ratio between the extrusion speed and the take-up speed of the long resin extruded from the extrusion port.
[0024]
【Example】
Hereinafter, examples of the present invention will be described.
[0025]
FIG. 1 is a perspective view showing a shock absorbing structure of a door trim according to a first embodiment of the present invention. FIG. 2 is a front view showing a state in which the shock absorbing structure of the door trim according to the first embodiment of the present invention is installed in the waist of the door trim. FIG. 3 is a sectional view showing a state in which the shock absorbing structure of the door trim according to the first embodiment of the present invention is installed in the waist of the door trim. FIG. 4 is a side view showing an attaching means for attaching the shock absorbing structure of the door trim to the door trim according to the first embodiment of the present invention.
[0026]
In the drawings, the same reference numerals and symbols as those of the conventional example indicate the same or corresponding parts as those of the conventional example, and thus, duplicate description will be omitted.
[0027]
As shown in FIG. 1, the shock absorbing structure of the first embodiment is the same as the shock absorbing structure shown in FIG. 10, in that a square interposed between the door trim 20 and the ornament board 13 on the inner panel 11 of the door 10. The entire outer wall 31 is formed in a square shape by a cylindrical outer wall 31 and an inner wall 32 formed by integrally arranging a large number of ribs 33 in an internal space of the outer wall 31 in a lattice pattern. On the other hand, the shock absorbing structure of the present embodiment is formed integrally by extrusion instead of injection molding as in the technique of FIG. 10, and a bottom wall is formed on one end side (rear side in FIG. 1) of the outer wall portion 31. It has not been. That is, in the present embodiment, the inner space of the outer wall 31 is communicated in the depth direction from one end to the other end by the plurality of ribs 33 of the inner wall 32, and the plurality of square pillar-shaped small chambers 34 are parallel to each other. Is divided into
[0028]
The shock absorbing structure of the door trim according to the present embodiment configured as described above includes the inside of the door trim 20, specifically, as shown in FIGS. 2 and 3, the lower part of the armrest 21 a of the waist 21 of the door trim 20 and the ornament board 13. One end face in the depth direction (left end face in FIG. 3) is in contact with the inner face of the waist 21 of the door trim 20 and the other end face (right end face) is in contact with the inner face of the ornament board 13. As shown particularly in FIG. 4, a resin clip 40 is integrally provided on the inner surface of the ornament board 13 as an attachment means for attaching the shock absorbing member of the door trim of this embodiment to a fixed position inside the door trim 20. Is molded. The clip 40 is composed of a pair of hook-shaped flexible pieces 41 whose tips are opposed to each other, and a plurality of clips 40 are respectively disposed at positions facing predetermined portions of the ribs 33 of the outer wall 31 and the inner wall 32. Then, the corresponding outer wall 31 and the other end of the rib 33 are sandwiched, and the shock absorbing structure of the door trim is held at a fixed position. For example, as shown in FIG. 4, the clip 40 may be disposed opposite to the upper and lower sides of the outer wall portion 31 and the respective ribs 33 extending in the horizontal direction, and may be sandwiched therebetween. You may make it oppose only at four corners and pinch the vicinity of each corner. Further, the clip 40 may be provided on the door trim 20 side. In addition, you may use another well-known fastening means, such as an adhesive or a clip of another shape, as an attachment means.
[0029]
The impact absorbing structure of the door trim configured as described above is provided at a predetermined position inside the door trim 20, for example, in the illustrated example, the inner surface of the waist 21 of the door trim 20 near the armrest 21a and the ornament on the inner panel 11 of the door 10. It is interposed between the inner surface of the board 13. The impact absorbing structure of the door trim absorbs the collision energy transmitted from the side of the vehicle by crushing the rib 33 forming the small chamber 34 substantially in the depth direction at the time of a side collision of the vehicle. Prevent shock to occupants.
[0030]
Next, a manufacturing apparatus and a manufacturing method of the shock absorbing structure of the present embodiment configured as described above will be described.
[0031]
FIG. 5 is a schematic view showing an apparatus for manufacturing a shock absorbing structure for a door trim according to the first embodiment of the present invention.
[0032]
As shown in FIG. 5, this manufacturing apparatus has a known cooling tank 55, a take-off means 57, and a cutting means 61 which are used for extrusion forming, which are sequentially arranged along the extrusion direction of an extruder 51. The extruder 51 is provided with a die 53 having an extrusion opening having a predetermined flat shape inside an extrusion head 52, which is exchangeable, and according to a required cross-sectional shape and dimensions of a shock absorbing structure of a door trim, the extrusion opening of the extrusion opening is formed. A plurality of dies 53 having different planar shapes are prepared. The take-up means 57 has a pair of upper and lower take-up rollers 58 arranged in a plurality of stages (two stages in the illustrated example) along the extrusion direction. Known control means 63 including a CPU, a ROM, a RAM and the like are connected to the extruder 51, the take-up means 57 and the cutting means 61, and the extruding speed of the extruder 51 and the length extruded from the extruder 51 are connected. The take-up speed of the long resin R1 by the take-off means 57, the cutting timing of the long resin R1 by the cutting means 61, and the like are controlled.
[0033]
In order to manufacture the door trim shock absorbing structure of the present embodiment using the manufacturing apparatus configured as described above, first, the sectional shape of the door trim shock absorbing structure, that is, the outer wall portion 31 and the plurality of ribs 33 are used. A die 53 having a lattice-shaped extrusion port corresponding to the lattice formed by the inner wall portion 32 made of is formed on an extrusion head 52 of an extrusion molding machine 51. Then, in the extrusion step, a predetermined resin material is extruded at a constant speed from an extrusion opening of the die 53, and a large number of ribs 33 extending in the extrusion direction intersect with the internal space of the quadrangular cylindrical outer wall portion 31 in a lattice shape. This is a long resin R1 that is arranged and communicates in the extrusion direction and has a number of small chambers 34 formed in parallel with each other. At the same time, the long resin R1 is nipped by the take-off roller 58 of the take-off means 57 and taken out at a constant speed, and the heated and softened long resin R1 extruded from the extruder 51 is transferred to the cooling layer 55 for cooling. Solidify.
[0034]
At this time, when it is necessary to change the cross-sectional shapes of the outer wall portion 31 and the inner wall portion 32 to a lattice shape or another cross shape having a different configuration from the illustrated example, the die 53 in the extrusion head 52 is replaced with a corresponding extrusion port. The die is replaced with a die 53 having a shape, and the resin material is extruded in the same manner as described above.
[0035]
Further, the ratio between the extrusion speed of the extruder 51 and the take-up speed of the take-up means 57 is determined by the control means 63 according to the required thickness of the outer wall 31 and the inner wall 32. For example, the thickness can be increased by increasing the extrusion speed while keeping the take-off speed constant, while the thickness can be decreased by decreasing the extrusion speed.
[0036]
Thereafter, the long resin R1 cooled and solidified by the cooling layer 55 is transferred to the cutting means 61 by the take-off means 57, and cut by the control means 63 under a predetermined length. The cutting length of the long resin R1 is determined by the distance between the mounting portions of the shock absorbing structure inside the door trim 20 of the vehicle type used, for example, the distance between the inner surface of the door trim 20 and the inner surface of the ornament board 13 in the illustrated example. It is the same. As a result, it is possible to obtain a molded product R2 having a desired depth and a desired shape that can be attached to a fixed position in the door trim 20, that is, the shock absorbing structure of the door trim of the present embodiment. Further, when it is necessary to change the depth dimension of the shock absorbing structure of the door trim due to specification change, the cutting length of the long resin R1 by the cutting unit 61 is changed under the control of the control unit 63.
[0037]
Next, another embodiment according to the present invention will be described below. In each embodiment, only the differences from the first embodiment will be described, and the same components as those in the first embodiment will be denoted by the same reference numerals in the drawings, and description thereof will be omitted.
[0038]
FIG. 6 is a perspective view showing the shock absorbing structure of the door trim according to the second embodiment of the present invention.
[0039]
In the shock absorbing structure of the door trim of the second embodiment, a large number of ribs 72 and 74 are arranged in an intersecting manner in a honeycomb core shape so that the whole is formed in a substantially square shape. There is no outer wall. That is, in the present embodiment, the outermost rib 72 constitutes a substantially quadrangular cylindrical outer wall portion 71 having continuous irregularities on the side surfaces, and the honeycomb core-like inner wall portion 73 is constituted by a number of ribs 74 on the inner side. Have been. It should be noted that a quadrangular cylindrical outer wall portion similar to that of the first embodiment may be integrally formed on the outermost side of the rib 72 in FIG. Further, the shock absorbing structure of the door trim according to the present embodiment is integrally formed by the same extrusion molding as that of the first embodiment, and a bottom wall is not formed at one end side (the rear side in FIG. 1) of the outer wall portion 71. . That is, also in the present embodiment, the inner space of the outer wall portion 71 is communicated in the depth direction from one end to the other end thereof by the large number of ribs 72 and 74 of the outer wall portion 71 and the inner wall portion 73, and is parallel to each other. Are partitioned into small hexagonal column-shaped chambers 75.
[0040]
The shock absorbing structure of the door trim according to the present embodiment configured as described above is fixed to the inside of the door trim 20 via attachment means such as the clip 40 in the same manner as in the first embodiment. By crushing the ribs 72, 74 forming substantially in the depth direction, the collision energy transmitted from the side of the vehicle is absorbed, and the impact on the occupant near the door trim 20 is prevented.
[0041]
Further, the shock absorbing structure of the door trim of the present embodiment uses the same manufacturing apparatus as that of the first embodiment, and the die 53 of the extruder 51 has a honeycomb core-shaped extrusion port shape corresponding to the cross-sectional shape thereof. And manufactured by the same process.
[0042]
FIG. 7 is a sectional view showing a state in which the shock absorbing structure of the door trim according to the third embodiment of the present invention is installed in the waist and the shoulder of the door trim.
[0043]
The shock absorbing structure of the door trim according to the third embodiment is similar to that of the above embodiment, in addition to the waist shock absorbing member 80 disposed on the waist 21 of the door trim 20 and the shoulder 22 located near the occupant's shoulder. A partial shock absorbing member 85 is provided. The waist impact absorbing member 80 is formed by intersecting flat plate-shaped ribs 81 in a lattice shape similar to the first embodiment or a honeycomb core shape similar to the second embodiment. Similarly, the shoulder impact absorbing member 85 is also formed by arranging flat plate-shaped ribs in a crossed manner in the same grid-like shape as in the first embodiment or in the same honeycomb core shape as in the second embodiment. The shape is changed to a predetermined shape corresponding to the internal shape of the shoulder 22 of the door trim 20.
[0044]
The waist shock absorbing member 80 and the shoulder shock absorbing member 85 of the shock absorbing structure of the present embodiment configured as described above are connected to the waist 21 of the door trim 20 via the attachment means such as the clip 40 in the same manner as in each of the above embodiments. The ribs 81 fixed to the inside of the shoulder 22 and crushing the ribs 81 forming the small chamber substantially in the depth direction at the time of a side collision of the vehicle absorb the collision energy transmitted from the side of the vehicle, and the vicinity of the door trim 20 Of the occupant near the waist and shoulders.
[0045]
The waist impact absorbing member 80 and the shoulder impact absorbing member 85 of the door trim impact absorbing structure of this embodiment use the same manufacturing apparatus as in the first embodiment, and the dies 53 of the extruder 51 are used. Is changed to an extrusion port shape corresponding to the cross-sectional shape, and it is manufactured by a similar process.
[0046]
FIG. 8 is a front view showing a pressing device for a shock absorbing structure of a door trim according to a fourth embodiment of the present invention.
[0047]
This embodiment uses the same manufacturing apparatus as the manufacturing apparatus of FIG. 5 and manufactures the door trim of the predetermined shape as in the above-described embodiments by the same manufacturing method. After the cutting of the long resin R1 by the means 61, the flat cut end face of the cut molded product R2 is hot-pressed by the press device 90 to obtain a desired concave or convex shape such as a curved or bent shape. It has a process. That is, as shown in FIG. 8, the press device 90 of the present embodiment has a lower mold 91 for placing and fixing the molded product R2 and a shape such as an inner side surface of the door trim 20 which is a mounting portion of the shock absorbing structure of the door trim. An upper mold 92 having a corresponding curved press surface 92a and heat-pressing one end surface of the molded product R2 into a desired curved shape is provided. In the illustrated example, the pressing surface 92a of the upper mold 92 is a curved surface of a radius corresponding to both ends so that both edges of the upper end surface of the molded product R2 have a curved shape of a predetermined radius.
[0048]
In this embodiment, the cut molded product R2 is placed on the lower die 91 of the press device 90, and the upper end surface thereof is heated and pressed by the upper die 92 to obtain a desired curved shape. The end face can have a desired curved shape according to the curved shape of the attachment portion of the door trim 20 and the like.
[0049]
Note that the press shape of the molded product R2 by the press device 90 is not limited to the illustrated example, and various shapes can be used according to the surface shape of the mounting portion.
[0050]
As described above, the shock absorbing structure of the door trim according to each of the above-described embodiments has a substantially cylindrical outer wall portion interposed between the door trim 20 and the inner panel 11 or the ornament board 13 of the door 10 by extrusion molding. 31 and 71, and a large number of internal spaces of the outer wall portions 31 and 71 are formed by extrusion molding so as to divide the internal space of the outer wall portions 31 and 71 into a number of small chambers 34 and 75 communicating from one end to the other end. And inner wall portions 32, 73 formed by integrally intersecting the ribs 33, 74.
[0051]
Therefore, the impact absorbing structure of the door trim of each of the above embodiments allows the small chambers 34, 75 to allow the plate-shaped outer walls 31, 71 and the ribs 33, 72, 74 of the inner walls 32, 73 to be crushed in the event of a side collision of the vehicle. By doing so, the collision energy transmitted from the side of the vehicle is absorbed, and the impact on the occupant near the door trim 20 is prevented.
[0052]
Here, since the outer wall portions 31 and 71 and the inner wall portions 32 and 73 formed by arranging a large number of ribs 33 and 74 in the outer wall portions 31 and 71 are formed integrally by extrusion, the shapes thereof are changed. If necessary, the shapes of the outer walls 31, 71 and the inner walls 32, 73 can be easily changed simply by changing the die 53 of the extruder 51 and changing the shape of the extrusion opening. Further, the thickness of the ribs 33, 72, 74 of the outer walls 31, 33 and the inner walls 32, 73 can be easily changed by changing the ratio between the extrusion speed and the take-up speed of the long resin R1 extruded from the extrusion port. be able to. Further, by changing the cutting length of the long resin R2 extruded from the extrusion port, the rib depth can be easily changed. Therefore, the degrees of freedom of the shapes of the outer wall portions 31 and 71 and the inner wall portions 32 and 73 are large, the shapes can be easily changed, and the dimensions such as the plate thickness and the rib depth can be easily changed.
[0053]
As a result, sufficient passive safety in the event of a side collision can be ensured, the cost of the molding machine can be reduced, and finally the product cost can be reduced, and the labor for changing the specifications can be reduced. , Workability can be improved. In addition, the ribs 33, 72, and 74 of the outer wall portions 31 and 71 and the inner wall portions 32 and 73 formed by extrusion have a thickness change due to draft, as in the example of FIG. 10 by injection molding. Therefore, the product quality can be further improved.
[0054]
Further, the method of manufacturing the impact absorbing structure of the door trim of each of the above embodiments is such that a resin material is extruded from a die 53 having a mesh-like planar-shaped extruding opening such as a lattice shape or a honeycomb core shape to form a substantially cylindrical outer wall portion 31. , 71, an extruding process in which a large number of ribs 33, 72, 74 extending in the extrusion direction are integrally arranged in an intersecting manner to form a long resin R1 having a number of small chambers 34, 75 communicating with each other in the extrusion direction. And a cutting step of cutting the long resin R1 to a predetermined length interposed between the door trim 20 and the inner panel 11, the ornament board 13 and the like of the door 10, and further extruded from the die 53. The long resin R1 to be taken is taken at a predetermined take-up speed, and the ratio of the take-up speed to the extrusion speed of the long resin R1 is changed to change the thickness of the long resin R1.
[0055]
Therefore, in the manufacturing method of each of the above-described embodiments, in the extrusion step, a large number of ribs 32 and 74 extending in the extrusion direction are integrally arranged in the internal space of the substantially cylindrical outer wall portions 31 and 71 and communicate with each other in the extrusion direction. A long resin R1 having a shape in which a large number of small chambers 34 and 75 are formed is obtained. Thereafter, in the cutting step, when the long resin R1 was cut at a predetermined length, a number of ribs 32, 74 were integrally arranged in the inner space of the outer wall portions 31, 71 to form the inner wall portions 32, 73. An impact absorbing structure as a resin molded product R2 having a predetermined rib depth and a predetermined plate thickness is obtained. Here, when it is necessary to change the overall shape, that is, the cross-sectional shape of the outer walls 31 and 71 and the inner walls 32 and 73, only the die 53 is changed to change the shape of the extrusion port, and the outer walls 31, 71 and the inner wall 32 are changed. , 73 can be easily changed. The rib depth can be easily changed by changing the cutting length of the long resin R1 extruded from the extrusion port. Therefore, the degree of freedom of the shapes of the outer wall portions 31 and 71 and the inner wall portions 32 and 73 can be increased, the shape can be easily changed, and the dimensions such as the rib depth can be easily changed. . Further, the thickness of the ribs 33, 72, 74 of the outer wall portions 31, 71 and the inner wall portions 32, 73 can be easily changed by changing the ratio between the extrusion speed and the take-up speed of the resin extruded from the extrusion port. Can be.
[0056]
As a result, dies 53 that can be manufactured relatively inexpensively can be manufactured with different specifications simply by preparing a plurality of dies 53 according to the specifications, and there is no need to particularly change the configuration of the conventional extrusion molding machine. Since there is no need to change the configuration of the manufacturing equipment for changing the thickness, the cost of the molding machine can be reduced, and finally the product cost can be reduced. Further, the labor for changing the specifications is reduced, and workability is improved. can do.
[0057]
In addition, the manufacturing method of the shock absorbing structure of the door trim of the fourth embodiment is the same as the manufacturing method of the first to third embodiments. And a press forming step for forming a desired curved shape.
[0058]
Therefore, in addition to the functions and effects of the above-described first to third embodiments, the resin molded product R2 after cutting is heated and pressed to form a desired curved shape so that the end surface of the mounting portion of the door trim 20 is formed. A desired shape according to the shape or the like can be obtained.
[0059]
As a result, by a relatively simple operation of a heating press, a portion to be attached to a predetermined position of the door trim 20 can be formed into an optimal end face shape, thereby enabling reliable and strong attachment and improving the workability. Can be.
[0060]
Incidentally, the shock absorbing structure of the door trim of each of the above embodiments is configured to be arranged near the armrest 21a of the waist 21 of the door trim 20 or between the shoulder 22 and the ornament board 13. The present invention is not limited to this, and any structure may be used as long as it functions to prevent a side impact on the occupant at the time of a side collision, and may be arranged at another portion of the door trim 20. However, in the case where the door trim 20 is arranged near the armrest 21a of the waist 21 or between the shoulder 22 and the inner panel 11 or the ornament board 13, the waist and the shoulder, which are the projecting portions of the occupant's body, are implemented. This has the effect of preventing the impact on the vehicle.
[0061]
Further, the shock absorbing structure of the door trim of the above embodiment is configured by arranging the ribs 33, 72, 74 in a grid or honeycomb core shape, but can be manufactured by extrusion and has a small chamber extending in the side direction. As long as there are a large number of the ribs 34 and 75, the ribs may be arranged in another crossing shape.
[0062]
【The invention's effect】
As described above, the shock absorbing structure of the door trim according to the first aspect of the present invention includes an outer wall portion formed into a substantially cylindrical shape interposed between the door trim and the door panel by extrusion, and the outer wall formed by extrusion. An inner wall portion formed by integrally arranging a number of ribs in the inner space of the outer wall portion so as to partition the internal space of the portion into a number of small chambers communicating from one end to the other end.A resin clip made of a pair of hook-shaped flexible pieces having opposing tips is integrally formed, sandwiches the corresponding outer wall or inner wall, and holds the outer wall and the inner wall in place on the inner surface. Ornament board installed inside the door trimIs provided.
[0063]
Therefore, in the event of a side collision of a vehicle, the small chambers allow the ribs of the plate-shaped outer and inner walls to be crushed, thereby absorbing and mitigating the collision energy transmitted from the side of the vehicle, and providing an impact to passengers near the door trim. To prevent
[0064]
Here, since the outer wall portion and the inner wall portion formed by intersecting a number of ribs in the outer wall portion are integrally formed by extrusion molding, if the shape needs to be changed, the die of the extruder is changed. The shape of the outer wall and the inner wall can be easily changed only by changing the shape of the extrusion port. Further, by changing the ratio between the extrusion speed and the take-up speed of the long resin extruded from the extrusion port, the thickness of the ribs on the outer wall and the inner wall can be easily changed. Further, the rib depth can be easily changed by changing the cutting length of the long resin extruded from the extrusion port. Therefore, the degree of freedom of the shape of the outer wall portion and the inner wall portion is large, the shape can be easily changed, and the dimensional changes such as the plate thickness and the rib depth can be easily performed.
[0065]
As a result, sufficient passive safety in the event of a side collision can be ensured, the cost of the molding machine can be reduced, and finally the product cost can be reduced, and the labor for changing the specifications can be reduced. , Workability can be improved.
Further, a resin clip made of a pair of flexible pieces is integrally formed with an ornament board disposed inside the door trim, and sandwiches the corresponding outer wall or inner wall, and connects the outer wall and the inner wall to the inner surface. , It is possible to reliably absorb the collision energy transmitted from the side of the vehicle and prevent an impact on the occupant near the door trim.
[0066]
In the shock absorbing structure for a door trim according to the second aspect of the present invention, the resin clip made of a pair of flexible pieces is formed into a hook-like shape with the ends thereof opposed to each other. It is possible to reliably absorb the collision energy transmitted from the side, prevent the impact on the occupant near the door trim, and improve the reliability.
[0067]
Claim3The method for manufacturing a shock absorbing structure of a door trim according to the invention is characterized in that a resin material is extruded from a die having a net-like flat extrusion port, and a plurality of ribs extending in the extrusion direction are integrally formed in an inner space of a substantially cylindrical outer wall portion. An extruding step of forming a long resin having a large number of small chambers communicating with each other in an extruding direction and cutting the long resin into a predetermined length interposed between a door trim and a door panel. Cutting process andA press forming step of heating and pressing the cut end surface of the long resin after cutting to obtain a desired curved shape;Is provided.
[0068]
Therefore, in the extrusion step, a long resin is obtained in which a large number of ribs extending in the extrusion direction are integrally arranged in the internal space of the substantially cylindrical outer wall portion so as to intersect with each other to form a large number of small chambers communicating with each other in the extrusion direction. . Thereafter, in the cutting step, when the long resin is cut at a predetermined length, a plurality of ribs are integrally intersected in the internal space of the outer wall to form a resin having a predetermined thickness at a predetermined rib depth at which the inner wall is formed. A shock absorbing structure as a molded product is obtained. Here, when it is necessary to change the overall shape, that is, the cross-sectional shape of the outer wall and the inner wall, the shape of the outer wall and the inner wall can be easily changed only by changing the die and changing the shape of the extrusion opening. Further, by changing the cutting length of the long resin extruded from the extrusion port, the rib depth can be easily changed. Therefore, the degree of freedom of the shapes of the outer wall portion and the inner wall portion can be increased, the shapes can be easily changed, and the dimensions such as the rib depth can be easily changed.
[0069]
As a result, dies that can be manufactured relatively inexpensively can be manufactured with different specifications simply by preparing a plurality of dies according to the specifications, and there is no need to particularly change the configuration of the conventional extrusion molding machine. The cost can be reduced, and finally, the product cost can be reduced. Further, the labor for changing the specifications can be reduced, and the workability can be improved.
[0070]
Then, the long resin after cutting is heated and pressed to form a desired curved shape on the end face, so that the end face can be formed into a desired shape corresponding to the shape of the mounting portion of the door trim. As a result, by a relatively simple operation of a heating press, a portion to be attached to a predetermined position of the door trim can be formed into an optimal end face shape, thereby enabling reliable and strong attachment and improving the workability. it can.
[0071]
Claim4The manufacturing method of the shock absorbing structure of the door trim according to the invention of claim3In the invention, the long resin extruded from the die is taken at a predetermined take-up speed, and the thickness of the long resin is changed by changing the ratio of the take-up speed to the extrusion speed of the long resin.
[0072]
Therefore, the claims3In addition to the above invention, the thickness of the ribs on the outer wall and the inner wall can be easily changed by changing the ratio between the extrusion speed and the take-up speed of the long resin extruded from the extrusion port.
[0073]
As a result, there is no need to change the configuration of the conventional extruder, and the cost of the extruder can be reduced, the product cost can be finally reduced, and the labor for changing the specifications can be reduced. Performance can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a shock absorbing structure of a door trim according to a first embodiment of the present invention.
FIG. 2 is a front view showing a state where the shock absorbing structure of the door trim according to the first embodiment of the present invention is installed in the waist of the door trim.
FIG. 3 is a cross-sectional view showing a state where the shock absorbing structure of the door trim according to the first embodiment of the present invention is installed in the waist of the door trim.
FIG. 4 is a side view showing attachment means for attaching the shock absorbing structure of the door trim to the door trim according to the first embodiment of the present invention.
FIG. 5 is a schematic view showing an apparatus for manufacturing a shock absorbing structure for a door trim according to a first embodiment of the present invention.
FIG. 6 is a perspective view showing a shock absorbing structure of a door trim according to a second embodiment of the present invention.
FIG. 7 is a cross-sectional view showing a state in which the shock absorbing structure of the door trim according to the third embodiment of the present invention is installed in the waist portion and the shoulder portion of the door trim.
FIG. 8 is a front view showing a pressing device of a door trim shock absorbing structure according to a fourth embodiment of the present invention.
FIG. 9 is a sectional view showing a conventional shock absorbing structure of a door trim.
FIG. 10 is a perspective view showing a shock absorbing structure of a resin rib type door trim manufactured by injection molding.
FIG. 11 is a sectional view taken along the line AA of FIG. 10;
FIG. 12 is a perspective view showing inserts of a mold for a shock absorbing structure of the door trim of FIG. 10;
FIG. 13 is a sectional view showing a change in the thickness of a shock absorbing structure of a door trim manufactured by a mold using the insert of FIG. 12;
[Explanation of symbols]
11 Inner panel (door panel)
31 outer wall
32 Inner wall
33 rib
34 Komuro
53 dice
71 Outer wall
72 rib
73 Inner wall
74 rib
75 Komuro
81 rib
R1 long resin

Claims (4)

An outer wall portion formed into a substantially cylindrical shape interposed between the door trim and the door panel by extrusion molding,
An inner wall portion formed by integrally arranging a number of ribs in the inner space of the outer wall portion so as to partition the inner space of the outer wall portion into a number of small chambers communicating from one end to the other end by extrusion. and,
A resin clip consisting of a pair of hook-shaped flexible pieces having opposing tips is integrally formed, sandwiches the corresponding outer wall or inner wall, and holds the outer wall and the inner wall in place on the inner surface. An impact absorbing structure for a door trim, comprising: an ornament board disposed inside the door trim. 2. The shock absorbing structure for a door trim according to claim 1, wherein the resin clip made of the pair of flexible pieces has a hook-like end. A resin material is extruded from a die having a net-shaped flat extrusion port, and a large number of small chambers communicating in the extrusion direction by integrally arranging a large number of ribs extending in the extrusion direction in the internal space of the substantially cylindrical outer wall portion. An extrusion step of forming a long resin having a shape formed with
A cutting step of cutting the long resin into a predetermined length interposed between the door trim and the door panel ,
A method of manufacturing a shock absorbing structure for a door trim, comprising: a hot press of a cut end surface of a long resin after cutting to obtain a desired curved shape . While taking the long resin extruded from the die at a predetermined take-up speed, changing the ratio of the take-up speed to the extrusion speed of the long resin, changing the plate thickness of the long resin. A method for manufacturing a shock absorbing structure for a door trim according to claim 3 .

Images