JP5105414B2 - Door panel - Google Patents

Description

  The present invention relates to a door panel in which an inner plate is integrated with an outer plate.

  FIG. 16 shows a hydraulic excavator 10 as a working machine, and an upper swing body 12 is turnably provided on a lower traveling body 11, and a cab 13, a work device 14, and a power device 15 such as an engine are provided on the upper swing body 12. Is installed. The power unit 15 is covered with an upper cover 16 and side doors 17 and 18. The side doors 17 and 18 are attached so as to be openable and closable by a hinge which will be described later, and the closed state is held by a latch device 19.

  The side doors 17 and 18 of the work machine include a double-structured door panel composed of an outer plate and an inner plate. When manufacturing such a door panel, the outer peripheral portion of the outer plate is used as the outer peripheral portion of the inner plate. The outer peripheral edge of the outer plate and the inner plate is fixed together by folding inward (hemming finish) in the wrapped state, and the bottom surface of the recess formed in the inner plate is used as the outer plate. It adhere | attaches with the adhesive agent (for example, refer patent document 1).

This type of double-structured side door may be provided with a ventilation opening for countermeasures against extreme heat. In that case, it is necessary to make holes in both the outer plate and the inner plate and overlap them.
JP-A-9-228412 (page 3, FIG. 8)

  In this case, both the outer plate and the inner plate are press structures, and the positional relationship between the outer plate and the inner plate is determined by bending the outer peripheral edge of the outer plate and connecting it to the inner plate. The error is relatively large, the drilled holes do not fit and often shift, and the opening area may be reduced.

  This invention is made in view of such a point, and it aims at providing the door panel which can ensure the opening area for ventilation | gas_flowing of an outer side board and an inner side board.

The invention described in claim 1 is attached to an outer plate provided with a vent hole assembly portion in which a plurality of vent holes are gathered and an entire inner surface of the outer plate, and bulges with respect to the outer plate. A vent which is formed in a concave shape with respect to the formed convex portion and is bonded to the inner side surface of the outer plate by an adhesive, and has a vent opening larger than one vent hole assembly portion of the outer plate. It is the door panel which comprised the inner side board provided with.

  According to a second aspect of the present invention, a plurality of sets of vent hole assembly portions and vent opening portions in the door panel according to the first aspect are provided.

According to the first aspect of the present invention, since the ventilation opening of the inner plate mounted on the entire inner surface of the outer plate is provided larger than the vent hole assembly portion of the outer plate , On the inner surface of the plate, it is manufactured when integrating the joint portion of the inner plate that is formed in a concave shape with respect to the bulge formed on the outer plate and bonded to the inner surface of the outer plate with an adhesive. Even if this tolerance occurs, the vent hole assembly portion of the outer plate is displaced within the range of the vent opening, so that the vent opening area of the outer plate and the inner plate is not impaired, and a predetermined opening area is maintained. It can be ensured and the workability at the time of manufacture can be improved.

  According to the second aspect of the present invention, it is possible to secure a sufficient opening area for ventilation by the plurality of sets of ventilation hole assembly portions and ventilation openings.

  Hereinafter, the present invention will be described in detail with reference to the first embodiment shown in FIGS. 1 to 12 and the second embodiment shown in FIGS.

  FIG. 12 shows a hydraulic excavator 10 as a work machine. An upper swing body 12 is turnably provided on a lower traveling body 11, and a cab 13, a work device 14, and a power device 15 such as an engine are mounted on the upper swing body 12. Is installed. The power unit 15 is covered with an upper cover 16, a side door 17, and the like. The side door 17 is attached so as to be openable and closable by a hinge which will be described later, and is kept closed by a latch device which will be described later.

  FIGS. 1 to 7 show a door panel 20 of the side door 17. As shown in FIGS. 4 and 7, the door panel 20 is press-molded in an uneven shape with respect to the outer plate 21 and the outer plate 21. FIG. A concave portion is fixed to the inner surface of the outer plate 21 and an inner plate 23 that forms a space 22 between the convex portion and the outer plate 21, and a space 22 between the outer plate 21 and the inner plate 23 is filled. Foamed material 24 is provided.

  The outer plate 21 has a thickness 1.2 to 5.0 times that of the inner plate 23. In other words, the inner plate 23 uses an iron plate having a thickness smaller than that of the outer plate 21. For example, when the outer plate 21 is a 1.2 mm iron plate, the inner plate 23 is preferably an iron plate of 0.6 mm, 0.8 mm or the like in order to satisfy the conflicting strength and workability.

  As shown in FIG. 7, the foam material 24 heats an unfoamed sheet-like foam material 24 a affixed to the inner surface of the inner plate 23 in a space 22 between the outer plate 21 and the inner plate 23. Foam and mold. The foam material 24a is desirably a highly foamable rubber-based sound absorbing material having a volume expansion coefficient of about 20 times. It is desirable to heat the foam material 24a simultaneously with the baking coating using a baking coating heating device.

  As shown in FIGS. 3 and 5, the outer plate 21 has a plurality of ventilation holes 25 formed in a regular hexagonal shape, and a collection of ventilation holes in which the ventilation holes 25 are gathered in a honeycomb shape through the connecting portions of the sides. A plurality of honeycomb-shaped air hole assembly portions 26 as a portion are provided by hole processing.

  As shown in FIG. 1 and FIG. 6, the inner plate 23 is formed into a concave shape and joined portions 27 and 28 as concave portions joined to the outer plate 21, and bulge molding with respect to these joint portions 27 and 28. And a convex portion 29 formed thereon.

  As shown in FIG. 6, the joint portions 27 of the inner plate 23 are formed in three rows in the lateral direction corresponding to the honeycomb-like vent hole assembly portions 26 of the outer plate 21. As shown in FIG. 5, vent openings 30 larger than one honeycomb-shaped vent hole assembly 26 of the outer plate 21 are provided by drilling.

  That is, a plurality of sets of ventilation openings 30 opened on the honeycomb-shaped ventilation hole assembly portion 26 of the outer side plate 21 and the joining portion 27 as the concave portion of the inner side plate 23 are provided in one-to-one correspondence. The ventilation opening 30 of the inner plate 23 is formed to be slightly larger than the honeycomb-shaped ventilation hole assembly 26 of the outer plate 21.

  As shown in FIGS. 8 and 9, the peripheral portion 31 of the outer plate 21 is hemmed so as to be folded and crushed so as to wrap around the peripheral portion 32 of the inner plate 23. That is, the outer plate 21 includes a hem processing portion 33 that bites and joins the peripheral portion 32 of the inner plate 23 with a peripheral portion 31 formed by folding back and flattening so as to wrap around the peripheral portion 32 of the inner plate 23. Yes.

  As shown in FIG. 8, at least the peripheral edge portion 32 of the inner plate 23 is bonded to the outer plate 21 with an adhesive 34, and the outer plate 21 and the inner plate 23 are bonded to each other at the hemming portion 33 by the adhesive 34. And seal. The adhesive 34 is preferably a paste-type structural adhesive having viscosity and thermosetting properties.

  As shown in FIG. 1 and FIG. 9, at the peripheral edge portion 31 of the outer plate 21, the folded portion of the corner portion of the outer plate 21 and the folded portion of the intermediate bent portion are cut out, respectively. An intermediate bent portion notch groove 36 is formed. The corners of the inner plate 23 corresponding to the corner cutout grooves 35 of the outer plate 21 are formed in an arc shape.

  FIG. 10 is an exploded perspective view of the side door 17 and is sandwiched between the outer plate 21 and the inner plate 23 that is positioned with respect to the outer plate 21 and is fixed to the inner surface of the outer plate 21. The internal reinforcing plate 41 for attaching the hinge is fixed.

  The internal reinforcing plate 41 is provided with a concave / convex joint portion 42 in which a concave / convex portion is repeatedly formed in the central portion, and hinge mounting surface portions 43 and 44 are continuously formed on one end side and the other end side of the concave / convex joint portion 42, respectively. One positioning fitting portion 45 and the other positioning fitting portion 46 are formed in a concave groove shape adjacent to the hinge mounting surface portions 43 and 44.

  With respect to the internal reinforcing plate 41, the convex portion 29 on the hinge mounting side of the inner plate 23 is provided with a concave / convex joint portion 47 in which a concave / convex portion is repeatedly formed in the center portion. Hinge mounting windows 48 and 49 are opened on the end sides, respectively, and one positioning fitting portion 51 and the other positioning fitting portion 52 protrude downwardly adjacent to the hinge mounting windows 48 and 49. It is formed in a shape.

  In the internal reinforcing plate 41, the size of one positioning fitting portion 45 and the other positioning fitting portion 46 are different. Similarly, in the inner plate 23, the size of one positioning fitting portion 51 and the other positioning fitting portion 52 are different. One positioning fitting portion 45 and positioning fitting portion 51 respectively provided at one corresponding position of the inner reinforcing plate 41 and the inner plate 23 are indented into each other so that the inner reinforcing plate 41 and the inner plate 23 are fitted. The other positioning fitting portion 46 and the positioning fitting portion 52 provided at the other corresponding position of each other are concavo-convexly fitted to each other.

  During positioning and fitting of the internal reinforcing plate 41, the concave / convex joint portion 42 of the internal reinforcing plate 41 is brought into close contact with the back surface of the concave / convex joint portion 47 of the inner plate 23 coated with an adhesive, and the hinge of the internal reinforcing plate 41 Since the mounting surface portions 43 and 44 are aligned with the hinge mounting windows 48 and 49 of the inner plate 23, the hinges 53 and 54 are connected to the hinge mounting surface portions 43 and 44 of the internal reinforcing plate 41 through these hinge mounting windows 48 and 49. Install each by welding.

  As shown in FIG. 10, the outer plate 21 and the inner plate 23 are provided with mounting holes 55a and 55b for mounting the latch device.

  FIG. 11 shows a method of manufacturing the door panel 20 in which the internal reinforcing plate 41 is incorporated. (A) Positioning the internal reinforcing plate 41 in the convex portion 29 of the inner plate 23 bulged and formed with respect to the outer plate 21. Then, the adhesive is applied between the concave and convex joint portions 42 and 47. A thermosetting adhesive 34 is also applied to the joint surfaces of the inner plate 23 and the inner reinforcing plate 41 that are joined to the outer plate 21. (B) The inner plate 23 in an adhesive-applied state is fitted into the peripheral portion 31 of the outer plate 21 via the inner reinforcing plate 41 in the bent and opened state while the peripheral portion 31 of the outer plate 21 is being hemmed. The inner plate 23 and the inner reinforcing plate 41 are positioned with respect to the outer plate 21. (C) The inner plate 23 and the inner reinforcing plate 41 are joined and fixed to the inner side surface of the outer plate 21 by folding the peripheral portion 31 of the outer plate 21 with the peripheral portion 32 of the inner plate 23 sandwiched by hemming. Seal.

  As shown in FIG. 7, the inner plate 23 has a convex portion 29 bulged with respect to the joint portion 27 that is formed in a concave shape and is in close contact with the outer plate 21. A step-shaped reinforcing deformation portion 56 is formed in the upper portion. The joint portion 27 of the inner plate 23 is bonded to the outer plate 21 by the adhesive 34, and the rising portion 57 of the convex portion 29 with respect to the joint portion 27 is continuously formed in an arc shape.

  The convex portion 29 and the reinforcing deformation portion 56 are formed endlessly along the concave joint portion 27 as shown in FIGS.

  As shown in FIG. 2, the inner plate 23 includes an adhesive reservoir 68 having an adhesive reservoir space 67 for storing the adhesive 34 in a joint 27 bonded to the outer plate 21 with an adhesive 34. Yes.

  The adhesive reservoir 68 of the inner plate 23 is provided in a continuous convex shape in the longitudinal joint 27 along the vent opening 30 provided at a location that matches the vent hole 25 of the outer plate 21. ing.

  As shown in FIG. 2, a margin 30a is formed so that the opening edge of the ventilation opening 30 opened in the joint 27 of the inner plate 23 does not overlap with the ventilation holes 25 opened in the outer plate 21. Thus, the air holes 25 are formed to be slightly larger than the region where the air holes 25 are gathered (that is, the honeycomb-like air hole gathering portion 26). Further, it is desirable that the connecting portion 25a between the air holes 25 be formed as thin as possible so long as the strength of the outer plate 21 can be maintained so as not to prevent the air flow passing through the air holes 25.

  As shown in FIG. 6, the inner plate 23 includes convex portions 29 that are bulged with respect to the joint portions 27 and 28, and among the convex portions 29, the upper and lower portions of the vent opening 30 are provided. Is provided with a projecting reinforcing convex portion 29a which is continuously bulged and formed along a lateral joint portion 27 which is continuously bonded to the outer plate 21, and the reinforcing convex portion 29a is further provided. Reinforcing recesses 70 are formed in a concave shape in the transverse direction.

  Next, the manufacturing process of the door panel 20 will be described.

  As shown in FIG. 7, a foam material 24a is affixed in the convex portion 29 of the inner plate 23, and the hinge mounting inner portion is placed in the convex portion 29 on one side of the inner plate 23 as shown in FIG. The reinforcing plate 41 is bonded, and further, a thermosetting adhesive 34 necessary for bonding to the outer plate 21 is applied to the bonding portion 27 as the concave portion of the inner plate 23 and the inner reinforcing plate 41, and FIG. As shown in FIG. 11C, the outer plate 21 and the inner plate 23 are positioned and overlapped, and the peripheral portion 31 of the inner plate 23 is hemmed as shown in FIG. The inner plate 23 and the inner reinforcing plate 41 are joined to the inner side surface of the outer plate 21 by folding and folding.

  Then, the adhesive 34 is cured by heating of the baking coating heating facility to bond the inner plate 23 and the inner reinforcing plate 41 to the outer plate 21, and further the heating of the baking coating heating facility as shown in FIG. The foam material 24a is foamed by this, the space 22 is filled with the foam material 24, and the paint sprayed in advance on the outer surfaces of the outer plate 21 and the inner plate 23 is baked by heating of the baking coating heating equipment. wear.

  For example, the thermosetting of the adhesive 34 is performed at 150 ° C. for 5 minutes, the foaming material 24 is foamed at 150 ° C. for 20 minutes, and the baking finish is performed at 180 ° C. to 200 ° C. for 20 minutes. Heat. These heating can be performed using the existing baking heating equipment.

  Finally, as shown in FIG. 6, the hinges 53 and 54 are welded to the hinge mounting surface portions 43 and 44 of the internal reinforcing plate 41 by fillet welding or the like through the hinge mounting windows 48 and 49 of the inner plate 23, respectively. At the same time, the latch device 19 is attached to the mounting holes 55a and 55b of the outer plate 21 and the inner plate 23.

  Next, effects of the first embodiment shown in FIGS. 1 to 12 will be described.

  As shown in FIG. 7, the hollow closed cross-section structure formed by the outer plate 21 and the inner plate 23 thinner than the outer plate 21 can reduce the weight, and the inner plate 23 is thicker than the inner plate 23 (inner side). The hollow closed cross-section structure with a sufficient height formed with the outer plate 21 (having a plate thickness 1.2 to 5.0 times that of the plate 23) provides sufficient strength against impact from the outside. A strong door panel that can be secured can be provided at low cost.

  Furthermore, the vibration can be absorbed by the foam material 24 filled between the outer plate 21 and the inner plate 23, and the sound generated from the door panel itself can be effectively attenuated, that is, the sound attenuation effect is high. Low noise can be achieved.

  As shown in FIGS. 1 and 6, the inner plate 23 is thinner than the outer plate 21 by bulging and forming the convex portion 29 with respect to the joint portion 27 formed in the concave shape of the inner plate 23. Even if it exists, it can shape | mold so that rigidity may be increased with a concavo-convex structure and can raise intensity | strength.

  As shown in FIG. 8 and FIG. 9, the hemming portion formed by folding and crushing the peripheral edge 31 of the outer plate 21 so as to wrap around the peripheral edge 32 of the inner plate 23 is thicker than the inner plate 23. Even with the plate 21, a hemming portion 33 having a fixed shape can be obtained, and a folded joint portion with stable quality can be obtained.

  That is, the hemming portion 33 that bites and joins the peripheral edge portion of the inner side plate 23 with the peripheral edge portion of the outer side plate 21 is folded back so as to wrap around the peripheral edge portion of the inner side plate 23. The shape of the hemming portion 33 of the outer plate 21 can be stabilized and the uniform quality can be maintained from the conventional hemming finish in which the bent portion is bulged into a circular cross section.

  At this time, it is not easy to fold the peripheral portion of the outer plate 21 at the corners and the intermediate bent portion of the outer plate 21, but the outer plate 21 is cut by the corner notch groove 35 as shown in FIGS. 1 and 9. Since the folded portion of the corner portion of the outer plate 21 is cut out by the middle bent portion cutout groove 36, the corner portion and the middle bent portion of the outer plate 21 are also cut out. It is possible to easily and accurately process the peripheral portion 31 of the outer plate 21 to be folded back and flattened.

  As shown in FIG. 8, the outer plate 21 and the inner plate 23 can be reliably integrated by bonding with the adhesive 34 and the hemming portion 33 of the outer plate 21.

  As shown in FIG. 9, the corners of the inner side plate 23 corresponding to the corner notch grooves 35 of the outer side plate 21 are formed in an arc shape, so that the corners of the inner side plate 23 are the corner notches of the outer side plate 21. Protruding from the groove 35 can be prevented.

  As shown in FIGS. 1 and 2, the ventilation openings 30 of the inner plate 23 are provided larger than the honeycomb-shaped ventilation hole assembly 26 of the outer plate 21, so that the inner plate 23 is formed on the inner surface of the outer plate 21. Even if manufacturing tolerances occur when integrating the outer plates 21, even if the outer plate 21 and the inner plate 23 are not accurately aligned due to the size tolerance of the press-formed product, the honeycomb shape of the outer plate 21 Since the vent hole assembly portion 26 is displaced within the range of the margin 30a of the vent opening 30, it is possible to prevent the inner plate 23 from blocking the honeycomb-like vent hole assembly portion 26 of the outer plate 21, and the outer plate 21 and the inner plate The opening area for ventilation of the plate 23 is not impaired, a predetermined opening area can be secured, the alignment of the outer plate 21 and the inner plate 23 can be facilitated, and the workability at the time of manufacturing can be improved.

  Further, in the door panel having a double structure of the outer side plate 21 and the inner side plate 23, the ventilation holes 25 that can be opened in a honeycomb shape in the outer side plate 21 with respect to the limited ventilation opening 30 of the inner side plate 23, A honeycomb-shaped vent hole assembly portion 26 with high opening area efficiency can be formed, and the honeycomb-shaped vent hole assembly portion 26 is formed by connecting a plurality of vent holes 25 formed in a regular hexagon through the joint portions of the vent hole sides. Since they are assembled in a honeycomb shape, it is possible to reduce the fluid resistance by securing the joint strength between the vent holes 25 and reducing the fluid resistance. The generation of turbulent flow due to obstruction can be reduced from the vent hole gathering part in which round holes and square holes are gathered.

  As shown in FIG. 6, a sufficient opening area for ventilation can be secured by the plurality of sets of honeycomb-like ventilation hole assembly portions 26 and ventilation openings 30.

  As shown in FIG. 10, the inner reinforcing plate 41 fixed between the inner plate 23 and the outer plate 21 at the convex portion 29 in which the inner plate 23 bulges with respect to the outer plate 21 of the door panel 20, The strength at the convex portion 29 can be reinforced, and in particular, the internal reinforcing plate 41 is positioned by the concave-convex fitting with respect to the inner plate 23. The position of 41 can be controlled, and the internal reinforcing plate 41 can be accurately positioned and fixed at the position where the reinforcement works most efficiently.

  That is, the positioning of the long internal reinforcing plate 41 with respect to the inner plate 23 is facilitated by the concave / convex fitting of one positioning fitting portion 45, 51 and the concave / convex fitting of the other positioning fitting portion 46, 52. You can be sure.

  Since the positioning fitting portions 45, 51 on one side and the positioning fitting portions 46, 52 on the other side are different in size, if the orientation of the internal reinforcing plate 41 is different, the positioning fitting portions 51, 52 of the inner plate 23 are different. Since the positioning fitting portions 45 and 46 of the internal reinforcing plate 41 cannot be aligned, the internal reinforcing plate 41 having directionality can be accurately incorporated into the inner plate 23.

  Since the hinges 53 and 54 are welded to the hinge mounting surface portions 43 and 44 of the internal reinforcing plate 41 through the hinge mounting windows 48 and 49 opened in the inner plate 23, the hinge is more than the case where the hinges 53 and 54 are attached to the inner plate 23. The mounting strength of 53 and 54 can be improved.

  As shown in FIG. 11, the inner plate 23 in an adhesive-applied state is attached to the inner reinforcing plate 41 in the peripheral portion 31 of the outer plate 21 in a bent and opened state while the peripheral portion 31 of the outer plate 21 is hemmed. The inner plate 23 and the inner reinforcing plate 41 are placed on the inner surface of the outer plate 21 by folding and positioning the peripheral portion 31 of the outer plate 21 with the peripheral portion 32 of the inner plate 23 sandwiched therebetween by hemming. Since the peripheral edge 31 in the middle of the hemming process of the outer side plate 21 is effectively used for positioning the inner side plate 23, the strength at the convex portion 29 of the inner side plate 23 that is formed in a concavo-convex shape with respect to the outer side plate 21 is secured. Can be secured by the internal reinforcing plate 41.

  As shown in FIG. 7, sufficient strength can be secured by the hollow closed cross-sectional structure formed by the outer plate 21 and the inner plate 23, and the inner plate 23 is connected to the joint portion 27 in close contact with the outer plate 21. On the other hand, since the reinforcing deformation portion 56 is formed in a step shape in the middle portion of the bulge-formed convex portion 29, the inner plate 23 which is simply formed with the convex portion 29 without forming such a reinforcing deformation portion 56 is further The strength can be improved, and the strength of the entire door panel can be improved.

  As shown in FIG. 6, the joint portion 27 bonded to the outer plate 21, the convex portion 29 formed in an endless manner along the joint portion 27, and the reinforcing deformation portion 56 reinforce each other, The strength of the inner plate 23 can be improved throughout.

  As shown in FIG. 2, an adhesive reservoir 68 having an adhesive reservoir space 67 for storing the adhesive 34 is provided in the joint portion 27 of the inner plate 23 bonded to the outer plate 21 with the adhesive 34. When the inner plate 23 is pressed and brought into close contact with the outer plate 21, the adhesive 34 extruded from between the outer plate 21 and the joint portion 27 of the inner plate 23 becomes the adhesive reservoir in the adhesive reservoir 68. It remains in the space 67 and the bonding force when the adhesive 34 is cured can be maintained.

  When used as a side door, the adhesive reservoir 68 continuously provided in the longitudinal joining portion 27 also functions as a vertical column, and can improve strength against a vertical load.

  When the opening 30 for ventilation of the inner side plate 23 is provided at a location that matches the ventilation hole 25 of the outer side plate 21 in extreme heat specifications, it is provided in a continuous convex shape along the ventilation opening 30 in the joint 27. Since the adhesive is left by the adhesive reservoir 68 of the inner plate 23, the bonding force by the adhesive 34 can be maintained even with a small adhesive area, and the strength can be reliably improved. Thus, the adhesive reservoir portion 68 of the inner plate 23 provided in a continuous convex shape in the joint portion 27 improves the strength of the joint portion 27 and prevents a decrease in strength around the opening.

  As shown in FIG. 6, along the joint 27 of the inner plate 23 continuously bonded to the outer plate 21, the outer plate 21 is protruded by the protruding reinforcing convex portion 29a continuously bulged. Reinforcing to improve the strength of the inner plate 23 bonded to the reinforcing projection 29a is made stronger by the reinforcing recess 70 formed in a concave shape in a direction transverse to the reinforcing projection 29a. In short, the inner plate 23 can be reinforced more strongly by forming a complex uneven shape on the inner plate 23 with the reinforcing convex portions 29a and the reinforcing concave portions 70 that intersect each other. Can be.

  Next, FIG. 13 to FIG. 15 show a second embodiment of the present invention. In short, this embodiment is the step-shaped reinforcing deformation portion 56 in the embodiment shown in FIG. 1 to FIG. Although not provided, the structure in which the ventilation opening 30 of the inner plate 23 is larger than the honeycomb-shaped ventilation hole assembly 26 of the outer plate 21 is the same as the embodiment shown in FIGS. Therefore, the same reference numerals are given and the description thereof is omitted.

  The present invention can be used for a door panel of a work machine such as a hydraulic excavator shown in FIG.

It is an expansion perspective view which shows 1st Embodiment of the door panel which concerns on this invention. It is the perspective view which fractured | ruptured the honeycomb-shaped ventilation hole assembly part formed in the outer side board of the door panel same as the above, and the ventilation opening part formed in the inner side board. It is an external view of a door panel same as the above. It is the IV-IV sectional view taken on the line of FIG. It is a perspective view of the outer surface side of a door panel same as the above. It is a perspective view of the inner surface side of a door panel same as the above. It is an expanded sectional view of a door panel same as the above. It is sectional drawing of the hemming process part of a door panel same as the above. It is an internal view of the hemming process part of a door panel same as the above. It is a disassembled perspective view of a door panel same as the above. It is sectional drawing which shows the mounting process of the internal reinforcement board of a door panel same as the above, (a) is sectional drawing which positioned and adhered the internal reinforcement board in the inner side board, (b) is in the middle of the hemming process of an outer side board It is sectional drawing which positioned the inner side board and the internal reinforcement board in the peripheral part, (c) is sectional drawing which carried out the hemming process of the outer side board, and joined and fixed the inner side board and the internal reinforcement board. It is a top view of the working machine provided with the door panel same as the above. It is an internal view which shows 2nd Embodiment of the door panel which concerns on this invention. It is the XIV-XIV sectional view taken on the line of FIG. It is an expanded sectional view of FIG. It is a perspective view which shows the outline | summary of the conventional working machine.

Explanation of symbols

20 door panel
21 Outer plate
23 Inner plate
25 Ventilation holes
26 Honeycomb-shaped vent hole assembly as vent hole assembly
27 joints
29 convex parts
30 Ventilation opening
34 adhesive

Claims (2)

An outer plate provided with a ventilation hole assembly portion that aggregates a plurality of ventilation holes;
It is located on the entire inner surface of the outer plate and is attached to the inner surface of the outer plate with an adhesive. And an inner plate provided with a ventilation opening larger than one ventilation hole assembly portion of the outer plate at the joint portion . 2. The door panel according to claim 1, wherein a plurality of sets of ventilation hole assembly portions and ventilation openings are provided.

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