JP5078803B2 - Door panel - Google Patents

Description

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

As a cover body structure of a work machine, there is a double structure composed of an outer plate and an inner plate, 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 The outer side plate and the inner side plate are fixed by hemming the peripheral edge of each. A hinge is attached to the flat portion of the convex portion provided relatively to the concave portion of the inner plate (see, for example, Patent Document 1).
JP-A-9-228412 (page 2-3, FIG. 2-8)

  This conventional double-structure cover body structure may be provided with a large ventilation opening as an extremely hot specification. At that time, the panel structure tends to be insufficient in strength. In particular, when the door panel is enlarged, it is difficult to ensure sufficient rigidity.

  This invention is made | formed in view of such a point, and it aims at providing the door panel which can ensure sufficient rigidity while providing a large ventilation opening part in a door panel.

  The invention described in claim 1 includes an outer plate having a ventilation opening and a plurality of transverse beam-shaped reinforcing convex portions fixed to the inner surface of the outer plate and protruding in a direction away from the outer plate. An inner plate having an opening for ventilation between a reinforcing plate housing convex portion formed in a columnar shape on one side and a reinforcing convex portion formed in a columnar shape on the other side, and an outer plate and an inner plate One side internal reinforcing plate fixed between the one side reinforcing plate housing convex part and the other side internal reinforcing plate fixed between the outer side plate and the other side reinforcing convex part And a door panel.

  According to a second aspect of the present invention, there is provided the door panel according to the first aspect, wherein a columnar reinforcing plate portion provided in the vertical direction at the center portion of the outer plate and a plurality of cross beam-shaped reinforcing members at the central portion of the inner plate. A columnar reinforcing convex portion provided in the vertical direction so as to intersect the convex portion and bonded to the reinforcing plate portion of the outer plate is provided.

  According to the first aspect of the present invention, the reinforcing plate storage convex portion bulged and formed in a columnar shape on one side via a plurality of transverse beam-shaped reinforcing convex portions and the columnar shape is formed on the other side. A large ventilation opening can be provided in the door panel by an inner plate having a ventilation opening between the reinforcing projection and the fixing plate between the outer plate and the reinforcing plate storage projection of the inner plate. Even if the door panel height increases, sufficient rigidity can be ensured by the internal reinforcing plate on one side and the internal reinforcing plate on the other side fixed between the outer plate and the reinforcing convex portion of the inner plate.

  According to the second aspect of the present invention, the columnar reinforcement is provided in the longitudinal direction at the center of the inner plate so as to intersect with the plurality of transverse beam-shaped reinforcing projections and is bonded to the reinforcing plate of the outer plate. Even if the door panel width increases, sufficient rigidity can be secured by the convex portion for use.

  Hereinafter, the present invention will be described in detail with reference to one embodiment shown in FIGS. 1 to 8 and another embodiment shown in FIGS.

  FIG. 7 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. 8 shows a side door 17 provided in the radiator chamber. The side door 17 is attached to the airframe side frame 18 by a hinge 54 so as to be opened and closed, and is engaged with a striker 19s attached to the airframe side frame on the opposite side. The closed state is maintained by the detachable latch device 19r.

  1 to 5 show a door panel 20 of the side door 17, which is press-molded into an uneven shape on 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 and the inner plate 23 are provided with three rows of ventilation openings 25.

  The outer plate 21 has a plate portion 26a on the hinge mounting side, a plate portion 26b formed in the horizontal direction of the uppermost and lowermost steps, and is formed in the horizontal direction of the second, third and fourth steps from the top. A ventilation opening 25a is opened between the formed plate portion 26c and the plate portion 26d on the latch mounting side.

  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.

  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. The foam material is preferably 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 simultaneously with the baking coating using a baking oven for baking coating.

  As shown in FIG. 1 and FIG. 2, the inner side plate 23 includes an opening side joint portion 27 and an outer peripheral side joint portion 28 joined to the outer side plate 21, and bulge molding with respect to these joint portions 27 and 28. And a convex portion 29 formed thereon.

  The convex portion 29 of the inner plate 23 includes a reinforcing plate housing convex portion 29a on the hinge mounting side, a thick horizontal beam-shaped reinforcing convex portion 29b formed in the lateral direction of the uppermost step and the lowermost step, and a second step from the top. The reinforcing projection 29c has a small cross section formed in the lateral direction of the third stage and the fourth stage, and the reinforcing projection 29d on the latch mounting side.

  On the thick horizontal beam-shaped reinforcing convex portion 29b, a reinforcing concave portion 30 which is concave in the vertical direction is formed. The reinforcing convex portion 29c having a small cross section is formed to be narrower and lower than the reinforcing convex portion 29b in order to secure the opening area of the ventilation opening portion 25, and the reinforcing concave portion 30 of the reinforcing convex portion 29b is formed. Absent.

  As shown in FIGS. 3 to 5, the joint portion 27 of the inner plate 23 corresponds to the three rows of vent openings 25 a opened in the outer plate 21, and the vent openings of these outer plates 21. A vent opening 25b slightly larger than the portion 25a is provided by drilling.

  The outer peripheral edge of the outer plate 21 is bitten and joined to the peripheral edge of the inner plate 23 by a hemming portion 33 formed by folding back and flattening so as to wrap around the peripheral edge of the inner plate 23. The joint portions 27 and 28 of the inner plate 23 are adhered to the outer plate 21 by an adhesive 34, and the outer plate 21 and the joint portions 27 and 28 of the inner plate 23 are joined and sealed by the adhesive 34. The adhesive 34 is preferably a paste-type structural adhesive having viscosity and thermosetting properties.

  FIG. 1 shows an exploded perspective view of the side door 17 so that it is sandwiched between an outer plate 21 and an 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 inner reinforcing plate 41 is provided with an elongated concave reinforcing portion 42 in the center, and hinge mounting convex portions 43 and 44 are formed in a flat shape on one end side and the other end side of the concave reinforcing portion 42, respectively. A plurality of bolt insertion holes 50 are formed in the mounting convex portions 43 and 44, respectively, and a positioning fit is provided between the two bolt insertion holes 50 and 50 at the center of each hinge mounting convex portion 43 and 44. The joining portions 45 are each formed in a concave shape.

  In contrast to the internal reinforcing plate 41, a central portion of the reinforcing plate housing convex portion 29a on the hinge mounting side of the inner plate 23 is provided with an elongated concave reinforcing portion 47 that fits into the concave reinforcing portion 42 of the internal reinforcing plate 41. Hinge mounting surface portions 48 and 49 are respectively formed in a flat shape on one end side and the other end side of the concave reinforcing portion 47, and a plurality of bolt insertion holes 48h and 49h are formed in these hinge mounting surface portions 48 and 49, respectively. In addition, one positioning fitting 51 and the other between the two bolt insertion holes 48h and 48h and between the two bolt insertion holes 49h and 49h, which are the central portions of the hinge mounting surface portions 48 and 49, respectively. The positioning fitting portions 52 are each formed in a convex shape protruding downward.

  And positioning fitting portions 51 and 52 provided on the hinge mounting surface portions 48 and 49 of the inner plate 23, and positioning fitting portions 45 provided on the hinge mounting convex portions 43 and 44 of the internal reinforcing plate 41, respectively. However, they are fitted to each other to position the inner reinforcing plate 41 with respect to the inner plate 23. By this positioning, the concave reinforcing portion 42 of the inner reinforcing plate 41 and the concave reinforcing portion 47 of the inner plate 23 are fitted, and the bolt insertion hole 50 of the inner reinforcing plate 41 and the bolt insertion holes 48h, 49h of the inner plate 23 are fitted. Are accurately positioned.

  As shown in FIG. 6, hinges 54 each having a plurality of bolt insertion holes 54 h are in contact with the hinge mounting surface portions 48 and 49 of the inner plate 23. These hinges 54 are pivotally connected to one side plate P1 fixed on the hinge mounting surface portions 48, 49 of the inner plate 23 by a shaft member S, and the other side. A long hole H into which a bolt for attaching the side door 17 to the body frame side is inserted in the side plate P2.

  Then, the bolt 55b inserted into the bolt insertion hole 54h of the hinge 54 through the washer 55w is welded to the back surface of the hinge mounting projections 43, 44 of the internal reinforcing plate 41 in a concentric manner with each bolt insertion hole 50, respectively. The hinge 54 is attached by screwing in and tightening.

  As shown in FIG. 3 to FIG. 5, the inner plate 23 has a step-shaped reinforcing deformation portion 56 in the middle portion of the convex portion 29 bulging and formed along the joint portions 27, 28 closely attached to the outer plate 21. The step-shaped reinforcing deformation portion 56 secures a sufficient height of the convex portion 29 with respect to the outer plate 21 and secures the strength.

  In particular, the thick horizontal beam-shaped reinforcing convex portion 29b is excellent in cross-sectional performance such as a secondary moment of section due to the reinforcing deformable portion 56 and the reinforcing concave portion 30, and has a characteristic that it is difficult to be deformed against bending stress.

  On the other hand, the reinforcing convex portion 29c having a small cross section is formed to have a smaller width than the reinforcing convex portion 29b, so that the opening area of the ventilation opening portion 25 can be formed large, and the reinforcing plate on the hinge mounting side Since it is formed lower than the projecting portion 57 at a location where it is connected to the storage convex portion 29a and the reinforcing convex portion 29d on the latch mounting side, it can be easily drawn.

  As shown in FIG. 4, the upper portion of the door panel 20 is bent closer to the fuselage than the substantially vertical portion below the door panel 20, but when this bending is performed, the inner surface 23 is reinforced on the hinge mounting side. Wrinkles are likely to occur at the upper portions of the plate housing convex portion 29a and the reinforcing convex portion 29d on the latch mounting side. Therefore, as shown in FIG. 1, FIG. 2, FIG. 4, FIG. 5, etc., a place where the reinforcing plate housing convex portion 29a on the hinge mounting side of the inner plate 23 and the reinforcing convex portion 29d on the latch mounting side are bent. In addition, wrinkle generation preventing recesses 58 and 59 for preventing wrinkles during bending are formed.

  As shown in FIGS. 1 and 5, the inner reinforcing plate 41 is also formed with a recess 60 that fits with one wrinkle prevention recess 58 of the inner plate 23 to prevent interference with the wrinkle prevention recess 58. ing.

  As shown in FIGS. 1 and 2, the reinforcing convex portion 29d located on the lower side of the other wrinkle-preventing concave portion 59 of the inner plate 23 is provided with a damping concave portion 62 and a latch mounting hole 63. The vibration recess 62 is used for preventing vibration of the door panel 20, and as shown in FIG. 8, a vibration suppression protrusion 65 is projected from the machine body side frame provided with the striker 19s that engages with the latch device 19r. The vibration control convex portion 65 can be fitted into the vibration control concave portion 62 of the door panel 20 in the closed state, and vibrations in the vertical direction of the door panel 20 can be suppressed.

  As shown in FIG. 1, parts similar to the internal reinforcing plate 41 on one side are processed to prepare an internal reinforcing plate 71 on the other side. This internal reinforcing plate 71 is formed on the concave reinforcing portion 42 of the internal reinforcing plate 71 in addition to the concave reinforcing portion 42, the hinge mounting convex portions 43 and 44, the positioning fitting portion 45 and the concave portion 60 similar to the internal reinforcing plate 41. A hole 72 is formed, and a notch 73 is machined into the hinge mounting convex portion 44. The hole 72 is fitted to the damping recess 62 of the inner plate 23, and the notch 73 is a latch mounting hole 63 of the inner plate 23. Mates with.

  Next, a method for manufacturing the door panel 20 will be described.

  The inner reinforcing plate 41 is installed in the reinforcing plate housing convex portion 29a of the inner plate 23, and the positioning fitting portions 51 and 52 provided on the hinge mounting surface portions 48 and 49 of the inner plate 23 and the inner reinforcing plate 41 The positioning fitting portions 45 provided on the hinge mounting convex portions 43 and 44 are fitted to each other to position the internal reinforcing plate 41 with respect to the inner plate 23, and are temporarily fixed with bolts and nuts.

  Similarly, the internal reinforcing plate 71 is installed in the reinforcing convex portion 29d of the inner plate 23, and the hole 72 is fitted into the damping concave portion 62 of the inner plate 23, and the notch 73 is latched to the inner plate 23. By fitting with the convex peripheral edge of the mounting hole 63, the internal reinforcing plate 71 is positioned with respect to the inner plate 23, and is temporarily fixed with bolts and nuts.

  The inner plate 23, the inner reinforcing plates 41 and 71, and the outer plate 21 are placed in a baking furnace for heating by hemming the peripheral edge of the outer plate 21 and fixed by a fixing jig (not shown). The thermosetting adhesive applied to the outer plate 21 is cured, and the outer plate 21, the inner plate 23, and the inner reinforcing plates 41 and 71 are bonded.

  At this time, the foam material pasted on the inner surface of the outer plate 21 or the inner plate 23 is foamed by heating in a baking paint heating furnace, and the space 22 is filled with the foam material 24. By the heating, the paint sprayed in advance on the outer surfaces of the outer plate 21 and the inner plate 23 is baked.

  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 operations can be performed using an existing baking oven for baking coating.

  After the heat curing, as shown in FIG. 6, the bolt 55b inserted through the washer 55w into the bolt insertion hole 54h of the hinge 54 and the bolt insertion holes 48h, 49h of the hinge mounting surface portions 48, 49 of the inner plate 23, The hinge 54 is screwed into a nut 55n integrated with the back surface of the hinge mounting convex portions 43, 44 of the internal reinforcing plate 41, and the hinge 54 is fastened and fixed by the bolt 55b and the nut 55n.

  Next, functions and effects of the embodiment shown in FIGS. 1 to 8 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 foam 24 filled between the outer plate 21 and the inner plate 23 absorbs vibration and can effectively attenuate the sound generated from the door panel itself, that is, the sound attenuation effect is high and the noise is low. Can be achieved.

  Vent between the reinforcing plate housing convex portion 29a bulged and formed in a columnar shape on one side and the reinforcing convex portion 29d bulged and formed in a columnar shape on the other side via a plurality of horizontal beam-shaped reinforcing convex portions 29c. A large ventilation opening can be provided in the door panel 20 by the inner plate 23 having the opening 25b for use, and one side fixed between the outer plate 21 and the reinforcing plate storage convex portion 29a of the inner plate 23 can be provided. Since both sides are reinforced by the internal reinforcing plate 41 and the other side internal reinforcing plate 71 fixed between the outer plate 21 and the reinforcing convex portion 29d of the inner plate 23, the height of the door panel in the vertical direction increases. However, sufficient rigidity of the door panel can be secured by the internal reinforcing plates 41 and 71 on both sides.

  In particular, the corner portion of the door panel on the side of the wrinkle prevention recess 59 that can vibrate as a free end without being restrained by the hinge 54 is reinforced by the internal reinforcing plate 71 and restrained in relation to the latch device 19r. The movement of the corners of the door panel can be effectively suppressed.

  The nut 55n integrated with the back surface of the bolt insertion hole of the hinge mounting convex portions 43, 44 of the internal reinforcing plate 41, the hinge 54, the inner plate 23, and the internal reinforcement that are in contact with the hinge mounting surface portions 48, 49 of the inner plate 23 Since the hinge 54 is attached to the inner plate 23 by the bolt 55b screwed into the nut 55n through each bolt insertion hole of the plate 41, it is possible to prevent the appearance of weld marks that impair the appearance and to fix the hinge 54 by welding. By adopting the bolt fastening structure instead, the flat welding cost required for welding is not required, and the hinge mounting surface portions 48 and 49 of the inner plate 23 and the internal reinforcing plate 41 are formed in a flat place. The hinge mounting convex portions 43 and 44 can be limited.

  Next, FIGS. 9 to 11 show another embodiment.

  As shown in FIG. 9, a vertical columnar reinforcing plate portion 26e is provided at the central portion of the outer plate 21, and a vertical columnar reinforcing convex portion 29e is provided at the central portion of the inner plate 23. As shown in FIGS. 10 and 11, the columnar reinforcing plate portion 26e and the reinforcing convex portion 29e are bonded and integrated. The same reference numerals are given to the same structures as those in the embodiment shown in FIGS. 1 to 8, and the description thereof is omitted.

  By configuring in this way, the columnar reinforcing convex portion 29e provided in the vertical direction so as to intersect the plurality of transverse beam-shaped reinforcing convex portions 29c at the center portion of the inner plate 23 is provided as the reinforcing plate of the outer plate 21. By adhering to the portion 26e, sufficient rigidity can be secured even if the width of the horizontal door panel is increased.

  The present invention is a door panel that can be used for a side door of a working machine such as a hydraulic excavator, a loader, or a bulldozer, such as a radiator room, a battery room, or a pump room.

It is a disassembled perspective view which shows one Embodiment of the door panel which concerns on this invention. It is an inner surface figure of a door panel same as the above. FIG. 3 is a cross-sectional view of the door panel of FIG. 2 III-III. FIG. 4 is a sectional view of the door panel taken along the line IV-IV in FIG. FIG. 2 is a sectional view taken along the line VV of FIG. 2 of the door panel. It is sectional drawing of the hinge attachment part 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 which shows the state which attached the door panel same as the above to the working machine. It is a disassembled perspective view which shows other embodiment of the door panel which concerns on this invention. It is an inner surface figure of a door panel same as the above. Fig. 10 is a cross-sectional view taken along the line XI-XI of the door panel.

Explanation of symbols

20 Door panel
21 Outer plate
23 Inner plate
25a Ventilation opening
25b Ventilation opening
26e Reinforcing plate
29a Reinforcing plate storage convex
29b Reinforcing projection
29c Reinforcement for reinforcement
29d Reinforcement for reinforcement
29e Reinforcing projection
41 Internal reinforcing plate
71 Internal reinforcing plate

Claims (2)

An outer plate having an opening for ventilation;
Reinforcing plate housing projections that are fixed to the inner surface of the outer plate and protrude in a columnar shape on one side via a plurality of transverse beam-shaped reinforcing projections that protrude in a direction away from the outer plate, and the other side An inner plate having a ventilation opening between the reinforcing projections bulging in a columnar shape;
An inner reinforcing plate on one side fixed between the outer plate and the reinforcing plate housing convex portion on one side of the inner plate;
A door panel comprising: an inner side reinforcing plate fixed between an outer side plate and a reinforcing projection on the other side of the inner side plate. A columnar reinforcing plate provided in the longitudinal direction at the center of the outer plate;
A columnar reinforcing convex portion provided in a vertical direction so as to intersect with a plurality of transverse beam-shaped reinforcing convex portions at the center portion of the inner plate and bonded to the reinforcing plate portion of the outer plate. The door panel according to claim 1.

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