JP4529942B2 - Construction machinery - Google Patents

Description

  The present invention relates to a hydraulic construction machine such as a hydraulic excavator, and more particularly to a construction machine such as a small hydraulic excavator in which a muffler serving as a heat radiation source and a hydraulic oil tank need to be arranged in a limited space.

  FIG. 6 shows a small hydraulic excavator called a mini excavator.

  In the figure, reference numeral 1 denotes a crawler type lower traveling body, and an upper revolving body 2 is mounted on the lower traveling body 1 so as to be pivotable about a vertical axis to constitute a base machine 3. A drilling attachment 4 is attached to the body 2.

  This excavation attachment 4 is constructed by attaching an arm 6 to the tip of a boom 5 and a bucket 7 to the tip of the arm 6 so as to be rotatable about a horizontal axis, and is bent and stretched by each cylinder 8, 9, 10 of the boom, arm and bucket. Perform excavation work in motion.

  A cover member 11 is provided on the upper swing body 2, a seat is attached to the upper surface side of the cover member 11 to form a driver seat 12, and a power source is provided below the driver seat 12 (engine room). Engine 13 and necessary equipment (here, only the hydraulic oil tank 14, the muffler 15 and the hydraulic pump 16 which are equipment related to the present invention are shown) are installed.

The above configuration is disclosed in Patent Document 1, for example.
JP 2001-107733 A

  In such a small hydraulic excavator, the space in the engine room is extremely small, and thus it is unavoidable that the various devices are arranged closely.

  In this case, since there is a demand for avoiding a high temperature from the viewpoint of protecting the sealing material of the hydraulic actuator and the like, the hydraulic oil needs to be arranged so as not to be affected by heat from the muffler 15 serving as a heat radiation source.

  For this reason, in the past, the device was devised to separate them as much as possible within a limited space. However, the degree of freedom in equipment layout and design is reduced accordingly, for example, it becomes difficult to configure the muffler 15 or the muffler piping is wasted. There was a negative effect of becoming longer.

  As a countermeasure against this point, it is conceivable to cover the muffler 14 with a heat insulating material. In this case, the muffler 15 is enlarged due to the thickness of the heat insulating material, which is not possible in terms of space in a small excavator and increases the cost.

  Moreover, since the heat insulating material deteriorates with the passage of time and the heat insulating performance decreases, it is necessary to make the heat insulating material thicker in anticipation of the long-term decrease in heat insulating performance, which is further disadvantageous in terms of space and cost. There are many problems and it is not a good idea.

  Therefore, the present invention provides a construction machine that can protect the hydraulic oil tank against heat radiation from the muffler while arranging the hydraulic oil tank and the muffler close to each other, and is advantageous in terms of space, cost, and performance. It is.

The invention of claim 1 is a construction machine in which an upper swing body is rotatably mounted on a lower traveling body, and an engine, a hydraulic pump, a hydraulic oil tank, a muffler and the like are accommodated in the upper swing body. disposed close to the hydraulic oil tank and muffler, heat shield plate to block the emitted to the hydraulic oil tank (0033) heat from the muffler, while covering the surface facing the muffler of the hydraulic oil tank same It is attached to the hydraulic oil tank in a state where an air layer is formed between the tank and the heat shielding plate that shields the portion of the hydraulic piping connected to the hydraulic pump close to the muffler from the muffler. the oil-stop section is intended digits set.

According to a second aspect of the present invention, in the configuration of the first aspect , a seat is provided on the upper revolving structure to form a driver's seat, and an engine and equipment are installed below the driver's seat .

According to the present invention, a hydraulic oil tank and muffler closely arranged, the heat shield plate between the two, since provided in a state in which the air layer is formed between the work dynamic oil tank, toward the hydraulic tank from the muffler The heat radiated can be blocked by the heat shield plate and the heat insulating layer made of air, and the temperature rise of the hydraulic oil tank (hydraulic oil) due to the muffler heat can be prevented.

  In other words, since the hydraulic oil tank can be protected from the muffler heat, both can be arranged close to each other. For this reason, the harmful effects of making the two spaced apart (the difficulty in constructing the muffler and the muffler piping becoming unnecessarily long) are eliminated, and in particular, the equipment layout and design of the small excavator (Claim 4). The degree of freedom can be increased.

  In addition, since it has a double heat shield structure that prevents direct heat with the heat shield and suppresses heat conduction with the air layer, for example, the heat shield effect per unit thickness dimension compared to the structure in which the muffler is covered with a heat insulating material However, there is almost no decrease in heat shielding performance due to deterioration as in the heat insulating material system.

For this reason, the thickness of the heat insulation layer (heat insulation plate + air layer) can be smaller than that of the heat insulation method, and structurally, the plate material (heat insulation plate) is between the hydraulic oil tank and the muffler. This is advantageous in terms of space, cost, and performance .

Further, since being attached only a heat shield plate to the hydraulic oil tank, it is possible to reduce the space and cost of the mounting member component, since also removed simultaneously heat shield plate by removing the hydraulic oil tank, the maintenance of the muffler It will be advantageous. Moreover, there is no possibility that the heat shield plate vibrates with the muffler during engine operation as in the case where it is attached to the muffler.

On the other hand, when the hydraulic pump is Ru is installed close to the muffler, event, when the oil leakage occurs in the part close to the muffler of the paired pump connection portion and the joint portion of the hydraulic pipe connected to the hydraulic pump, This oil may scatter and adhere to the muffler.

In this respect, according to this onset bright, the heat shield plate, because providing the oil-stop portion for shielding the pipe section close to the muffler relative to the muffler, there is no possibility that oil leaking-scattered to adhere to the muffler, safety It becomes.

  An embodiment of the present invention will be described with reference to FIGS.

  Here, the small hydraulic excavator exemplified in the background art section is taken as an example of application.

  In each figure, the upper frame 17 constituting the upper swing body, the engine 18 mounted on the upper frame 17, the hydraulic oil tank 19, the muffler 20, the hydraulic pump 21, the cooling fan 22, the radiator, which are related equipment, are shown. Only 23 is shown and illustration of other devices is omitted.

  Although not shown, a cover material is provided on the upper frame 17 so as to cover the devices, and a seat is provided on the upper surface side of the cover material to constitute a driver's seat, and devices are installed below the driver's seat. This is the same as the conventional small excavator shown in FIG.

  The engine 18 is installed in the center of the rear part of the upper frame 17, and a hydraulic oil tank 19, a muffler 20, a hydraulic pump 21 are arranged on the left side of the engine 18, and a cooling fan 22 and a radiator 23 are arranged on the right side.

  The hydraulic oil tank 19 is formed in a box shape from metal or plastic, and is attached to the upper frame 17 by a gantry (not shown). In addition, illustration of the in / out piping with respect to the tank 19 is abbreviate | omitted.

  The muffler 20 is connected to the exhaust system of the engine 18 and is disposed between the tank 19 and the engine 18 so as to be close to the right side surface 19 a of the hydraulic oil tank 19.

  The hydraulic pump 21 is disposed below the hydraulic oil tank 19 and the muffler 20 while being connected to the output shaft of the engine 18. In each figure, 24 is a pump connection pipe (only a part is shown) connected to the hydraulic pump 21.

  In this shovel, the heat radiated from the muffler 20 to the hydraulic oil tank 19 is configured to be blocked by a heat shield plate 25 provided therebetween.

  The heat shield plate 25 is a metal plate (for example, an iron plate having a thickness of about 1.6 mm) and is formed along the right side surface (side surface facing the muffler 20) 19a of the hydraulic oil tank 19, and the right side surface of the tank. 19a is attached to the muffler 20 and attached to the hydraulic oil tank 19 with an air layer 26 having a substantially constant thickness formed therebetween.

  Specifically, for example, nuts 27 (only reference numerals in FIG. 5) are welded and fixed to a plurality of locations on the right side surface 19a of the tank, and a plurality of bolts 28 penetrating the heat shield plate 25 are attached to the nuts. 27...

  In this case, the heat shield plate 25 may be provided in a state in which substantially the entire right side surface 19a of the tank is shielded from the muffler 20, or only a portion close to the muffler 20 and susceptible to muffler heat as illustrated. You may provide in the state which shields.

  Further, the heat shield plate 25 is provided with an oil stop portion 25 a that horizontally shields a portion of the pump connection pipe 24 adjacent to the muffler 20 from the muffler 20.

  According to this configuration, the heat radiated from the muffler 20 toward the hydraulic oil tank 19 is blocked by the heat shield plate 25 and the heat insulating layer (air layer) 26 of air, and the temperature of the hydraulic oil tank 19 (hydraulic oil). The rise can be prevented.

  Accordingly, since the hydraulic oil tank 19 and the muffler 20 can be arranged close to each other, adverse effects caused by arranging the oil oil tank 19 and the muffler 20 apart from each other (the muffler 20 becomes difficult to configure or the muffler piping is unnecessarily long). In particular, in a small excavator that does not have enough space as described in this embodiment, the degree of freedom in device layout and design can be increased.

  In addition, since a double heat shield structure is employed in which direct heat is prevented by the heat shield plate 25 and heat conduction is suppressed by the air layer 26, for example, a unit thickness dimension as compared with a heat insulating material system in which the muffler 20 is covered with a heat insulating material. The heat shielding effect per hit becomes higher in each stage, and there is almost no decrease in the heat shielding performance due to deterioration as in the heat insulating material system.

  For this reason, compared to the heat insulating material method, the total thickness of the heat insulating layer including the heat shield plate 25 and the air layer 26 can be reduced, and structurally, between the hydraulic oil tank 19 and the muffler 20. Since only the plate material (heat shield plate) 25 needs to be added, it is advantageous in terms of space, cost, and performance.

Moreover, shielding for the heating plate 25 is attached to the hydraulic oil tank 19, it is possible to save space and cost compared with the case of using another independent mounting member.

  Furthermore, as shown in FIG. 4, if the hydraulic oil tank 19 is removed, the heat shield plate 25 is also removed at the same time, which is advantageous for maintenance of the muffler 20. Further, unlike the case where the heat shield plate 25 is attached to the muffler 20, there is no possibility that the heat shield plate 25 vibrates together with the muffler 20 during engine operation.

  On the other hand, when the hydraulic pump 21 is arranged close to the muffler 20 as in this embodiment, an oil leak should occur in a portion of the pump connection pipe 24 that is close to the muffler 20 in the connection portion to the pump and the joint portion. This oil may scatter and adhere to the muffler 20.

  On the other hand, an oil stopper 25a is provided on the heat shield plate 25, and the oil stopper 25a is configured to shield the pipe portion adjacent to the muffler 20 from the muffler 20. There is no fear of causing trouble by adhering to 20, and it becomes safe.

By the way, in the said embodiment, although the heat shield 25 was provided in the state which shielded only the right side surface 19a of the hydraulic oil tank 19 from the muffler 20, the position and shielding range which provide the heat shield 25 are the hydraulic oil tank 19 and the shielding range. According to the positional relationship of the muffler 20, etc., it can change suitably from a viewpoint of interrupting | blocking muffler heat effectively .

It is a schematic side view which shows arrangement | positioning of the upper frame and apparatus of the hydraulic shovel concerning embodiment of this invention. It is the same top view. It is the same rear view. It is a schematic back view of the state which removed the hydraulic oil tank. It is the figure which expanded a part of FIG. 1 is a schematic side view of a small hydraulic excavator to which the present invention is applied.

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving body 12 Driver's seat 17 Upper frame 18 Engine 19 Hydraulic oil tank 19a Tank right side surface 20 Muffler 21 Hydraulic pump 24 Pump connection piping 25 Heat shield 25a Oil stopper 26 Air layer 27 Nut 28 Bolt

Claims (2)

In a construction machine in which an upper swing body is pivotably mounted on a lower traveling body, and the upper swing body houses an engine, a hydraulic pump, a hydraulic oil tank, a muffler, and other devices, the hydraulic oil tank and the hydraulic pump and placed in close proximity to the muffler, the air layer between the heat shield plate to block the heat radiated to the hydraulic oil tank, hydraulic oil tank the tank while covering the surface facing the muffler therein from the muffler mounted on hydraulic oil tank in a state but formed, and, in the heat shield plate, it was only set the oil-stop portion for shielding a portion close to the muffler of the hydraulic pipe connected to the hydraulic pump with respect to the muffler Construction machine characterized by. Thereby forming an operator's seat provided with a seat on the upper rotating body, the construction machine according to claim 1 Symbol mounting, characterized in that installed the engine and equipment below the driver's seat.

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