JP2009084799A - Door panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a door panel of a double structure composed of outside and inside plates which increases an opening area efficiency, and reduces the generation of a turbulent flow in an air flow through a vent hole. <P>SOLUTION: A plurality of sets of honeycomb vent hole-assembled portions 26 in which a plurality of vent holes 25 formed in hexagonal shapes are assembled in a honeycomb pattern via a connecting portion 25a of each side of the vent hole are provided in the outside plate 21 by hole drilling. A ventilation opening 30 of the inside plate 23 is formed in a shape slightly larger than those of the honeycomb vent hole-assembled portions 26 of the outside plate 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a door panel including an outer plate and an inner plate.

  FIG. 15 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 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.

  A side door that is opened and closed by maintenance such as an engine room and a cooling package of such a working machine is provided with a plurality of elongated slot-hole-like intake holes (see, for example, Patent Document 1). Some side doors are provided with a plurality of louvers (see, for example, Patent Document 2).

On the other hand, this type of side door includes a double-structured cover body in which the inner plate is integrally fixed to the outer plate with a gap. The inner plate has a plurality of recesses, and the recesses of the inner plate are bonded to the outer plate, and the outer plate and the inner plate are fixed by hemming the peripheral edge of the outer plate (for example, (See Patent Document 3).
Japanese Patent Laying-Open No. 2006-170108 (page 7, FIG. 2) JP-A-10-213344 (2nd page, FIG. 9) JP-A-9-228412 (second page, FIG. 8)

  When the side door of the work machine is provided with a plurality of elongated slot hole-like air intake holes, it is necessary to provide partition portions between the air intake holes, and these partition portions are used for securing the door strength. Due to the required dimensions, the opening area efficiency occupied by the opening area from the intake hole at one end to the intake hole at the other end is reduced, and the partition portion becomes an air flow resistor, and turbulence is generated in the partition portion. There are problems that are likely to occur.

  Similarly, the louver requires a predetermined louver thickness for the reason of strength, and there are problems that the opening area efficiency is lowered and the louver becomes an air flow resistor, and turbulence is likely to occur.

  In addition, when opening a ventilation hole for air intake holes or countermeasures for extreme heat in a double-structured cover body, it is common to accurately align the ventilation openings opened on both the outer and inner plates In this case, processing and assembly are not easy.

  The present invention has been made in view of the above points, and aims to increase the opening area efficiency and reduce the occurrence of turbulence in the air flow in the vent hole in a double-structure door panel of an outer plate and an inner plate. And Furthermore, it aims at providing the door panel which can perform alignment of an outer side board and an inner side board easily.

  The invention described in claim 1 includes an outer plate, and an inner plate that is formed in a concavo-convex shape with respect to the outer plate and has a concave portion fixed to the inner surface of the outer plate, and the outer plate has a hexagonal shape. A honeycomb-like vent hole assembly portion in which a plurality of formed vent holes are gathered in a honeycomb shape via a joint portion of each side of the vent hole, and the inner plate corresponds to the honeycomb-like vent hole assembly portion of the outer plate. It is a door panel provided with the opening part for ventilation | gas_flowing opened by the recessed part.

  The invention described in claim 2 is such that the opening for ventilation of the inner plate in the door panel according to claim 1 is formed larger than the aggregated portion of the honeycomb-shaped ventilation holes of the outer plate.

  According to the first aspect of the present invention, in the door panel having a double structure of the outer plate and the inner plate, the outer plate can be opened in high density in a honeycomb shape with respect to the limited ventilation opening of the inner plate. The vent hole can form a honeycomb-shaped vent hole assembly portion with high opening area efficiency, and the honeycomb-shaped vent hole assembly portion includes a plurality of hexagonal vent holes connected to each side of the vent hole. Since they are assembled in a honeycomb shape, it is possible to reduce the fluid resistance by narrowing the joints while securing the joint strength between the vents, and the joints between the vents block the air flow The generation of turbulent flow due to this can be reduced.

  According to the second aspect of the present invention, since the opening for ventilation of the inner plate is formed larger than the honeycomb-shaped vent hole assembly portion of the outer plate, the outer plate is subjected to the size tolerance of the press-formed product. Even if the alignment of the inner plate is not accurate, there is a margin to prevent the inner plate from blocking the honeycomb-shaped vent hole assembly portion of the outer plate, so that the alignment of the outer plate and the inner plate can be facilitated.

  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 6 show a door panel 20 of the side door 17. As shown in FIGS. 3 and 6, 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. 6, 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 FIG. 2 and FIG. 4, the outer plate 21 has a plurality of ventilation holes 25 formed in a hexagonal shape as a ventilation hole assembly part that is aggregated in a honeycomb shape via a joint part of each side of the ventilation hole. A plurality of honeycomb-shaped vent hole assembly portions 26 are provided by hole processing.

  Each vent 25 is preferably formed in a regular hexagon with each side having the same length, but if it is a vertically symmetric and left-right symmetric hexagon, that is, if it is a point symmetric hexagon, it is a vertically or horizontally long 6 It may be square.

  As shown in FIG. 1 and FIG. 5, the inner side plate 23 is formed in a concave shape and joined to the outer side plate 21 as joints 27 and 28 as dents, and bulge-molded with respect to these joints 27 and 28. And a convex portion 29 formed thereon.

  As shown in FIG. 5, the joint portions 27 of the inner plate 23 are formed in three rows in the horizontal direction corresponding to the honeycomb-shaped vent hole assembly portions 26 of the outer plate 21. As shown in the figure, the ventilation openings 30 larger than the honeycomb-like ventilation 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. 7 and 8, the peripheral edge portion 31 of the outer plate 21 is hemmed so as to be folded and crushed so as to wrap around the peripheral edge 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. 7, 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. 8, 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. 9 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 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. 9, the outer plate 21 and the inner plate 23 are provided with mounting holes 55a and 55b for mounting the latch device.

  FIG. 10 shows a method of manufacturing the door panel 20 incorporating the internal reinforcing plate 41. (a) Positioning the internal reinforcing plate 41 within 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. 6, 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. 11, 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. 11, the margin 30 a 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. 5, 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 ventilation 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. 6, 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. The outer plate 21 and the inner plate 23 are positioned and overlapped as shown in FIG. 10), 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 equipment to bond the inner plate 23 and the internal reinforcing plate 41 to the outer plate 21, and further, as shown in FIG. 6, heating of the baking coating heating equipment. 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. 5, through the hinge mounting windows 48 and 49 of the inner plate 23, 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, 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. 6, the hollow closed cross-sectional 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 5, 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 FIGS. 7 and 8, the hemming portion formed by folding and crushing the peripheral portion 31 of the outer plate 21 so as to wrap the peripheral portion 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 turn the peripheral edge 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. 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. 7, 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, and the sealing effect by the adhesive 34 can be obtained. Can also be obtained.

  As shown in FIG. 8, 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 11, the vent opening 30 of the inner plate 23 is provided larger than the honeycomb-shaped vent 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 hexagonal vent holes 25 via connecting portions 25a on the sides of the vent holes. Since they are assembled in a honeycomb shape, it is possible to reduce the fluid resistance by reducing the connecting portion 25a while ensuring the strength of the connecting portion 25a between the vent holes 25, and the connecting portion between the vent holes 25. The generation of turbulent flow due to the air flow being blocked by 25a can be reduced from the vent hole gathering portion in which round holes and square holes are gathered.

  As shown in FIG. 5, 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. 9, 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. 10, 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. 6, 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 that is in close contact with the outer plate 21. On the other hand, since the reinforced deformation portion 56 is formed in a step shape at the intermediate portion of the bulge-formed convex portion 29, the strength can be improved as compared with the inner plate on which the reinforcement deformation portion 56 is not formed. Strength can be improved.

  As shown in FIG. 5, the joint portion 27, the convex portion 29 formed in an endless manner along the joint portion 27, and the reinforcing deformation portion 56 reinforce each other so that the strength of the inner plate 23 is increased as a whole. Can be improved over time.

  As shown in FIG. 11, an adhesive reservoir 68 having an adhesive reservoir space 67 for storing the adhesive 34 is provided in the joint 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. Further, the adhesive reservoir 68 continuously provided in the vertical joint 27 also functions as a vertical column when used as a side door, and can improve the strength against a vertical load.

  As shown in FIG. 5, along the joint 27 of the inner plate 23 continuously bonded to the outer plate 21, the outer plate 21 is projected by a 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 and FIG. 14 show a second embodiment of the present invention. This embodiment is basically 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 is applicable to 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 an external view of a door panel same as the above. It is the III-III 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 perspective view which shows the adhesive reservoir part formed in the inner side board of a door panel same as the above. 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 a perspective view which shows the outline | summary of a working machine.

Explanation of symbols

21 Outer plate
23 Inner plate
25 Ventilation holes
26 Honeycomb vent hole assembly
27 Joint as a recess
30 Ventilation opening

Claims (2)

An outer plate,
The inner plate is formed in a concavo-convex shape with respect to the outer plate and has a concave portion fixed to the inner surface of the outer plate,
The outer plate includes a honeycomb-shaped vent hole assembly portion in which a plurality of vent holes formed in a hexagonal shape are gathered in a honeycomb shape through a joint portion of each side of the vent hole,
The door panel is characterized in that the inner plate includes a vent opening that is opened in the recess corresponding to the honeycomb-shaped vent hole assembly portion of the outer plate. The door panel according to claim 1, wherein the ventilation openings of the inner plate are formed larger than the honeycomb-shaped ventilation hole assembly portion of the outer plate.

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