JP2010047935A - Door panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a door panel capable of being efficiently and easily provided with vent holes. <P>SOLUTION: A ventilation plate 41 is provided in an opening 25 of an outside and inside plates 21 and 23. In other words, a plurality of stud bolts 43 are protruded from a joint 27 as an opening edge of the inside plate 23 by stud welding. The plurality of cut grooves 45 for inserting the stud bolt are formed by being cut in at the peripheral edge 44 of the ventilation plate 41. The stud bolt 43 in a corresponding position is inserted into the cut groove 45; and a peripheral edge 44 of the ventilation plate 41 is fixed to the opening edge of the inside plate 23 by means of a nut 46 screwed to each of the stud bolts 43. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

  FIG. 6 shows a hydraulic excavator 10 as a work 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 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 to be freely opened and closed by a hinge on one side, and is kept closed by a latch device 18 on the other side.

  As this type of door panel structure, there is a cover structure having a double structure in which an inner plate that is press-molded with respect to the outer plate is fixed to the inner surface of the outer plate (see, for example, Patent Document 1). .

Furthermore, as this type of side door 17, an opening type door having a double structure shown in FIGS. 7 and 8 has been proposed. This side door 17 includes a door panel 20 of a heat wave specification that improves ventilation and can cope with heat, and this door panel 20 is formed by integrating an outer plate 21 and an inner plate 23 with an adhesive, etc. The outer plate 21 is provided with an opening 25a in which small mesh-like (or lattice) ventilation holes are gathered, and the inner plate 23 is provided with a large opening 25b that does not interfere with the opening 25a.
JP-A-9-228412 (page 3, FIG. 6-8)

  In this case, there are cases where the outer plate 21 is formed by press bending even at the portion provided with the vent hole assembly type opening 25a, and in this case, if the press bending is performed after directly opening a small ventilation hole in the outer plate 21, The vent hole position may move due to material inflow during press molding, and it is difficult to control the vent hole position, so the vent hole of the outer plate 21 is larger than the large opening 25b of the inner plate 23. The outer periphery of the collective opening 25a must be separated by a certain distance, and the opening efficiency is not good.

  This invention is made in view of such a point, and it aims at providing the door panel which can provide a vent hole efficiently and easily.

  According to the first aspect of the present invention, there is provided an outer plate having an opening, an inner plate having an opening fixed to an inner surface of the outer plate, and a vent hole provided in the opening of the inner plate. Opened vent plate, a plurality of stud bolts protruding from the opening edge of the inner plate and inserted into the peripheral edge of the vent plate, and screwed to the plurality of stud bolts, respectively. It is the door panel of the structure which comprised the some nut fixed to an edge.

  According to a second aspect of the present invention, in the door panel according to the first aspect, a plurality of cut grooves for inserting stud bolts are formed in the peripheral edge portion of the ventilation plate.

  The invention described in claim 3 uses a plate material in which the ventilation plate in the door panel according to claim 1 or 2 is thicker than the outer plate.

  According to the first aspect of the present invention, the vent holes can be efficiently provided in the openings of the outer plate and the inner plate through the vent plate, and the inner plate is provided with no weld marks on the outer plate. The ventilation plate can be easily fixed by a plurality of stud bolts protruding from the opening edge and a plurality of nuts respectively screwed to the stud bolts.

  According to the second aspect of the present invention, the stud bolt can be easily inserted into the peripheral portion of the vent plate by inserting the cut groove formed in the peripheral portion of the vent plate into the stud bolt.

  According to the invention described in claim 3, since the vent plate thicker than the outer plate is used, when the vent plate in which the vent holes are perforated is pressed and bent, the material between the vent holes of the vent plate is formed. Since the hole position is less likely to be displaced than the vent hole directly drilled in the outer plate, it is easy to control the hole position and the vent hole can be processed to the maximum extent to the opening. Efficiency can also be improved.

  The present invention will be described below with reference to one embodiment shown in FIGS. 1 to 4 and another embodiment shown in FIG.

  FIG. 3 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.

  FIG. 4 shows a side door 17 provided in a pump chamber adjacent to the engine chamber. The side door 17 is attached to the machine body side frame 19 through a hinge (not shown) so as to be freely opened and closed. A ventilation opening 25 formed in an elongated shape in the lateral direction is provided in the upper portion of the slab. A ventilation plate 41 is attached to the opening 25 from the inside.

  FIGS. 1 and 2 show a door panel 20 of the side door 17, which is press-molded in an uneven shape with respect to the outer plate 21 and the outer plate 21, and a recess is fixed to the inner surface of the outer plate 21. And an inner plate 23 forming a space 22 between the convex portion and the outer plate 21, and a foam material 24 filled in the space 22 between the outer plate 21 and the inner plate 23. .

  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 a thin iron plate of 0.6 mm, 0.8 mm, etc. in order to satisfy the conflicting strength and workability. Since this is suitable for one-time punching, various uneven portions described below are formed by pressing so as to obtain a predetermined strength.

  The foam material 24 is foamed by heating an unfoamed sheet-like foam material affixed to the inner surface of the outer plate 21 or the inner plate 23 in the space 22 between the outer plate 21 and the inner plate 23, Mold. As the foam material, it is desirable to heat a highly foamable rubber-based sound-absorbing material having a volume expansion coefficient of about 20 times simultaneously with the baking coating using a baking coating heating equipment.

  The upper portion of the door panel 20 is bent toward the machine body, and an opening 25 is provided in the bent portion. As shown in FIG. 2, the opening 25 includes an opening 25 a punched into the upper part of the outer plate 21 and an opening 25 b punched into the upper part of the inner plate 23.

  The inner plate 23 is formed in a concave shape and joined to the outer peripheral plate 21 on the inner peripheral side of the convex portion 27, a joint portion 28 formed on the outer peripheral edge and joined to the outer plate 21, and these joint portions. Convex portions 29 bulged and formed with respect to 27 and 28 are provided. An opening 25b is formed in the joint portion 27.

  As shown in FIG. 2, the inner plate 23 has a convex portion 29 bulging out from 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 part 30 is formed in the upper part.

  The peripheral portion of the outer plate 21 includes a hemming portion 33 that is processed so as to be folded and crushed so as to wrap around the peripheral portion of the entire inner plate 23.

  As shown in FIG. 2, an adhesive 34 is applied between the outer plate 21 and the joint portion 27 of the inner plate 23. In the hemming portion 33, the outer plate 21 and the inner plate 23 are joined and sealed by the applied adhesive 34. The adhesive 34 is preferably a paste-type structural adhesive having viscosity and thermosetting properties.

  A ventilation plate 41 is provided in the opening 25 b of the inner plate 23. This ventilation plate 41 is obtained by punching a large number of small mesh-like or honeycomb core-shaped ventilation holes 42 in advance in a metal plate body thicker than the outer plate 21, for example, about 1.6 mm thick. Alternatively, a punching plate may be used, or a vent hole 42 may be formed by a processing machine such as press punching, drilling, electric discharge processing, or laser processing.

  In this case, the vent plate 41 thicker than the outer plate 21 was used because after the vent hole 42 was opened in the vent plate 41, it was press-bent into a shape along the inner plate 23. This is to prevent the material between 42 and 42 from cracking or moving the vent hole 42. The ventilation plate 41 is attached to the joint portion 27 that is the peripheral portion of the opening 25b of the inner plate 23.

  That is, as shown in FIG. 1, a plurality of stud bolts 43 are protruded by stud welding from a joint portion 27 that is an opening edge of the inner plate 23, while a vent hole 42 is provided in the peripheral portion 44 of the vent plate 41. Instead, a plurality of notch grooves 45 for inserting stud bolts are formed, so that these notch grooves 45 are inserted into stud bolts 43 at corresponding positions, and each stud bolt 43 is inserted. The peripheral edge 44 of the ventilation plate 41 is fixed to the opening edge of the inner plate 23 by the nuts 46 screwed together.

  An internal reinforcing plate (not shown) is built in one side portion of the inner plate 23, and a hinge 48 is attached to the internal reinforcing plate, and the door panel 20 is attached to the body frame 19 via the hinge 48. Further, a sound absorbing material 49 is affixed to the joint portion 27 located below the inner plate 23.

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

  A foam material is affixed inside the convex portion 29 of the inner plate 23 or the inner surface of the outer plate 21, and a thermosetting adhesive 34 is applied to the joint portion 27 of the inner plate 23 that contacts the outer plate 21. The inner plate 23 is joined to the inner side surface of the outer plate 21 by positioning and overlapping the inner plate 23 with the inner reinforcing plate and fixing the peripheral portion of the outer plate 21 with the hemming portion 33.

  Then, the adhesive 34 is cured by heating of the baking coating heating equipment to bond the inner plate 23 to the outer plate 21, and further, the foaming material is formed as shown in FIG. 2 by heating of the baking coating heating equipment. Foaming is performed to fill the space 22 with the foaming material 24, and further, the paint sprayed in advance on the outer surfaces of the outer plate 21 and the inner plate 23 is baked by the heating of the baking painting heating equipment.

  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. 1, a hinge 48 is attached to an internal reinforcing plate (not shown) through one side of the inner plate 23 with a bolt (not shown), and the peripheral portion of the opening 25 of the door panel 20. Attach the ventilation plate 41 to the. The ventilation plate 41 is attached by inserting a notch groove 45 provided in the peripheral portion 44 of the ventilation plate 41 into a stud bolt 43 at a corresponding position, and screwing a nut 46 to each stud bolt 43. The peripheral edge 44 of the ventilation plate 41 is fixed to the joint portion 27 that is the opening edge of the inner plate 23 by the nut 46.

  Next, effects obtained from the above embodiment will be described.

  A 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 (1.2-5 of the inner plate 23). A solid closed door structure with a sufficient height formed with the outer plate 21 (having a plate thickness of .0 times) makes a strong door panel that can secure sufficient strength against impact from the outside at a low cost. Can be provided.

  The hollow closed cross-section structure formed by the outer plate 21 and the inner plate 23 can secure sufficient strength, and the inner plate 23 is connected to the joint portion 27 that is in close contact with the outer plate 21 as shown in FIG. A reinforcing deformation part 30 is formed in a step shape in the middle part of the bulge-formed convex part 29, and by increasing the height of the convex part 29 by the reinforcing deformation part 30 formed in this step shape, Since the cross-sectional secondary moment is proportional to the cube of the height of the convex portion 29, the strength can be further improved compared to the inner plate 23 on which the convex portion 29 is formed, and the strength of the entire door panel can be improved.

  The foam material 24 and the sound absorbing material 49 filled between the outer plate 21 and the inner plate 23 can absorb vibrations, effectively attenuating the sound generated from the door panel itself, that is, the sound attenuation effect. High and low noise can be achieved.

  A vent hole 42 can be efficiently provided in the opening 25 of the outer plate 21 and the inner plate 23 via the vent plate 41, and stud welding is performed from the opening edge of the inner plate 23 so as not to leave a welding mark on the outer plate 21. The ventilation plate 41 can be easily fixed by the plurality of stud bolts 43 protruded by the plurality of stud bolts 43 and the plurality of nuts 46 screwed into the stud bolts 43, respectively.

  At that time, the stud bolt 43 can be easily inserted into the peripheral portion 44 of the vent plate 41 by inserting the cut groove 45 formed in the peripheral portion 44 of the vent plate 41 into the stud bolt 43.

  Since the vent plate 41 thicker than the outer plate 21 is used, when the vent plate 41 in which the vent holes 42 are perforated is pressed and bent, the material between the vent holes 42 and 42 of the vent plate 41 is damaged. Furthermore, as shown in FIG. 7, since the hole position is less likely to be displaced when pressed than when the vent hole is directly formed in the outer plate 21, the hole position can be easily controlled and the opening 25 can be controlled. Since the vent hole 42 can be processed to the maximum extent, the opening efficiency can be improved.

  Next, FIG. 5 shows another embodiment, in which the uppermost joint portion 27 corresponding to the bent portion of the door panel 20 is closed without opening, and the intermediate portion joint portion 27 has an opening portion. 25, and the ventilation plate 41 is attached to the opening 25 by a stud bolt 43 and a nut 46. The other structure is the same as that shown in FIG. The description of the function and effect is omitted.

  The present invention is applicable to a door panel of a work machine such as a hydraulic excavator.

It is a disassembled perspective view which shows one Embodiment of the door panel which concerns on this invention. It is sectional drawing 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 a perspective view of the part which attached the door panel same as the above to the working machine. It is a disassembled perspective view which shows other embodiment of a door panel same as the above. It is a perspective view of the conventional working machine. It is a front view of a proposed door panel. It is the VIII-VIII sectional view taken on the line of FIG.

Explanation of symbols

20 Door panel
21 Outer plate
23 Inner plate
25a opening
25b opening
41 Ventilation plate
42 Ventilation holes
43 Stud bolt
44 Edge
45 slot
46 Nut

Claims (3)

An outer plate having an opening;
An inner plate having an opening, fixed to the inner surface of the outer plate;
A vent plate provided in the opening of the inner plate, in which vent holes are perforated;
A plurality of stud bolts protruding from the opening edge of the inner plate and inserted through the peripheral edge of the ventilation plate;
A door panel comprising: a plurality of nuts which are respectively screwed into the plurality of stud bolts and fix the ventilation plate to the opening edge of the inner plate. The door panel according to claim 1, wherein the ventilation plate includes a plurality of cut grooves for inserting stud bolts formed in the peripheral edge. The door panel according to claim 1 or 2, wherein a plate material thicker than the outer plate is used for the ventilation plate.

Images