JP2007224677A - Cover structure in construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ventilation cover having a ventilation property and strength and reduce the number of components and welding spots to shorten a manufacturing time and cost in forming the ventilation cover that covers a storage chamber storing equipment requiring ventilation in a construction machine equipped with the equipment requiring ventilation such as a radiator and oil cooler. <P>SOLUTION: The ventilation cover 12 is formed by folding and machining a flat punching metal M with a number of punched holes P into a folded shape. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention belongs to the technical field of a cover structure in a construction machine equipped with a device that requires ventilation, such as a radiator or an oil cooler.

In general, construction machines such as hydraulic excavators are equipped with devices that require ventilation, such as radiators and oil coolers, but the cover that covers the storage chamber in which such devices are stored flows in and out of air. In addition, depending on the model of the construction machine, the upper surface of the cover may be used as a scaffold for the worker depending on the type of construction machine.
Therefore, conventionally, a cover that covers the upper part of a storage chamber in which a radiator or the like is stored is formed of a lattice called a grating (see, for example, Patent Document 1).
JP 2003-3519 A

  By the way, the conventional grating is a welded structure formed by combining a plurality of flat bars in a lattice shape. For this reason, there are a large number of parts or many welding points, and it takes time and cost to manufacture. . Furthermore, since there are many welding parts, there exists a problem that it is easy to generate | occur | produce distortion and it is hard to give dimensional accuracy, and the subject which this invention tends to solve here exists.

The present invention was created in order to solve these problems in view of the above circumstances, and the invention of claim 1 is provided with a storage chamber in which a device requiring ventilation is provided. In this construction machine, the ventilation cover that covers at least a part of the storage chamber is formed by bending a flat punching metal into a crease shape.
And by doing in this way, a flat punching metal is bent into a pleated shape, thereby forming a ventilation cover having air permeability and strength. Compared to the case where the ventilation cover is formed by a so-called grid-like welded structure, the number of parts and welded portions are greatly reduced, which can greatly contribute to the reduction of manufacturing time and cost. In addition, the occurrence of distortion due to welding is reduced, which can contribute to improvement in dimensional accuracy.

  Next, embodiments of the present invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes a hydraulic excavator which is an example of a construction machine, and an engine 3, a hydraulic pump 4 driven by the engine 3, and a crankshaft of the engine 3 are disposed at a rear portion of the upper swing body 2 of the hydraulic excavator 1. An engine room 8 is provided in which various devices such as a cooling fan 5 directly connected, a radiator 6 that cools engine coolant, and an oil cooler 7 that cools hydraulic oil are housed.

  The radiator 6 and the oil cooler 7 correspond to a device that requires ventilation according to the present invention, and are cooled by cooling air flowing into the engine room 8 by the rotation of the cooling fan 5. . Further, the engine 3 itself is also cooled by the cooling air. The engine room 8 in which the radiator 6, the oil cooler 7, and the engine 3 are housed corresponds to a housing room in which equipment that requires ventilation according to the present invention is housed. The left and right side covers 9L and 9R that can be freely opened and closed are covered, and the upper part of the engine room 9 is covered by an upper surface cover 10 described later.

  The upper surface cover 10 includes an openable / closable engine hood 11 and a ventilation cover 12 disposed on the left and right sides of the engine hood 11 (the upstream side of the flow of cooling air with respect to the radiator 6 and the oil cooler 7). And a fixed cover 13 disposed on the other left and right sides of the engine hood 11.

  The ventilation cover 12 is formed with a large number of ventilation holes 12a serving as cooling air inlets. The ventilation cover 12 is formed of a flat punching metal M as shown in FIG. As shown in 3 (B) to (D), the ridges 12b and the valleys 12c are bent into a fold shape so as to continue alternately, and the mounting brackets 12d are fixed to both ends by fixing means such as welding. It is formed by. The flat punching metal M is formed by punching a steel plate, and a large number of punch holes P are regularly arranged vertically and horizontally. And this punch hole P becomes the ventilation hole 12a formed in the ventilation cover 12, and cooling air flows in from this, but in this Embodiment, the ventilation hole 12a is the peak part 12b, the trough part. 12c, and is arranged on any of the flat surface portions 12e between the mountain portions 12b and the valley portions 12c.

  The ventilation cover 12 formed by bending the flat punching metal M into a pleat shape in this way has a large number of ventilation holes 12a, and can ensure good ventilation, and the engine hood 11 can be secured. When opening and performing maintenance work in the engine room 8, it is possible to ensure sufficient strength for the worker to use the ventilation cover 12 as a scaffold. Further, when the worker uses the ventilation cover 12 as a scaffold, the worker puts his / her feet on the mountain portion 12b of the ventilation cover 12, but as described above, the ventilation hole 12a is also formed in the mountain portion 12b. There is also an advantage that the hole edge of the vent hole 12a becomes an edge to perform an anti-slip function.

  Here, as the punching metal M of the present embodiment, as shown in FIG. 3 (A), a punched hole P called a round hole staggered hole is used. However, the punching metal M is limited to this. 4 (A), (B), (C), and (D), various punches such as round hole series punching, long hole zigzag punching, rhombic hole zigzag punching, square hole zigzag punching, etc. A punching metal M in which holes P are formed can be used. Further, the plate thickness of the punching metal M and the opening ratio of the punch holes P (determined by the hole diameter and pitch of the punch holes P) can be appropriately selected in consideration of the air permeability and strength when the ventilation cover 12 is used. Further, the bent portion and the bent angle when the punching metal M is bent into a pleat shape can be appropriately changed in consideration of the air permeability and strength when the vent cover 12 is used.

  In the drawing, 9a is a vent hole formed in the left side cover 9L, 11a and 11b are vent holes formed in the engine hood 11, and 2a is a vent hole formed in the bottom surface of the engine room 8.

  In the present embodiment configured as described, a part of the upper part of the engine room 8 is covered with a ventilation cover 12, which is a flat punching metal in which a number of punch holes P are punched out. It is formed by bending M into a pleat shape. The vent cover 12 formed by bending the punching metal M into a pleat shape, as described above, has good air permeability and sufficient strength even when a worker works as a scaffold during maintenance work. To prepare.

  As a result, the ventilation cover 12 having air permeability and strength can be formed by bending the punching metal M into a pleated shape, and thus, compared with a conventional grid-like welded structure called grating. As a result, the number of parts constituting the ventilation cover 12 is greatly reduced, and the number of welding points is also greatly reduced (in this embodiment, only the welding point of the mounting bracket 12d), thereby reducing the time and cost for manufacturing. It can contribute greatly. In addition, the occurrence of distortion due to welding is reduced, which can contribute to improvement in dimensional accuracy.

  Of course, the present invention is not limited to the above embodiment, and the equipment that requires ventilation may be a cooler for a supercharger, a condenser for an air conditioner, or the like, and ventilation is required. For example, the storage chamber in which the equipment is stored may be a chamber in which a radiator or an oil cooler is stored separately from the engine. Furthermore, in the above embodiment, the present invention is applied to the ventilation cover 12 that covers the upper side of the engine room 8, but the present invention can of course be applied to the ventilation cover that covers the side and rear of the storage chamber. .

  By the way, the ventilation cover 12 of the above-described embodiment serves as a scaffold for workers during maintenance work, as described above, that is, it is one of the steps (footrests, treads) provided in the construction machine. As shown in Fig. 5, other steps provided in the construction machine (e.g., a lifting step where a foot is raised when moving up and down to the driver's seat or the upper surface of the aircraft, a worker's passage provided along the side of the aircraft and during maintenance work, etc. The catwalk) 14 can be formed by bending a flat punching metal into a crease like the vent cover 12. The step 14 formed by bending the punching metal into a crease shape in this way has water permeability and strength, and is formed so that the punch hole is located at the peak when the crease shape is bent. By doing so, an anti-slip function is also provided, and it can be manufactured easily and inexpensively.

It is a top view of a hydraulic excavator. It is a rear view of the hydraulic shovel which shows the inside of an engine room. (A) is a perspective view of a punching metal, (B) is a perspective view of a ventilation cover, (C) is an enlarged view of the XX cross section of (B), and (D) is an enlarged view of the YY cross section of (B). is there. (A), (B), (C), (D) is a figure which shows the other examples of punching metal. It is a top view of the hydraulic excavator provided with the step.

Explanation of symbols

12 Ventilation cover M Punching metal

Claims (1)

  In a construction machine provided with a storage room for storing equipment that requires ventilation, a ventilation cover that covers at least a part of the storage room is formed by bending flat punching metal into a pleat shape. Cover structure in construction machinery characterized by

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