JP5395419B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine such as a pile driving machine and a crane, and more particularly to a cooling structure for a construction machine that cools equipment arranged in an engine room with cooling air taken from an intake port by a cooling fan.

In a construction machine with an upper revolving structure that can be swiveled above the lower traveling structure, an engine room that houses various devices such as engines, radiators, intercoolers, oil coolers, cooling fans, hydraulic pumps, etc. These are cooled by supplying the cooling air taken in from the cooling air inlet provided in the wall of the engine room to the radiator, the intercooler, and the oil cooler. In addition, it has been proposed to cool the fuel tank with cooling air after passing through the oil cooler (see, for example, Patent Document 1).
JP 2003-11679 A

  In recent diesel engines, a common rail fuel injection system that stores high-pressure fuel and injects it from an injector has been adopted. In this common rail type, part of the fuel that has become hotter than before due to the increased pressure of the fuel returns to the fuel tank through the return line without being injected from the injector, so the temperature of the fuel stored in the fuel tank Gradually increases, causing problems such as a decrease in engine output and a decrease in durability. In the thing of the said patent document 1, since the cooling air which passed through the oil cooler and raised the temperature is utilized, the fuel tank could not be cooled sufficiently.

  Then, this invention aims at providing the construction machine provided with the fuel tank cooling structure which can cool a fuel tank efficiently with external air.

In order to achieve the above object, the construction machine of the present invention comprises an upper slewing body provided on a lower traveling body so as to be able to swivel, and a driver's cab and an engine compartment, and an engine, a radiator, and a cooling fan are accommodated in the engine compartment. In the construction machine in which the engine room is provided with a cooling air suction port in the foremost part located on the suction side of the radiator and an exhaust port in the rear part, the upper revolving body is combined with a hollow cylindrical member The cab is provided on the right side of the floor frame formed in the above and the engine room is provided on the left side, and a working device is disposed between the cab and the engine room. The engine is disposed in the center of the vehicle body in the longitudinal direction of the vehicle body, and an oil is disposed behind the engine. Pump, the cooling fan on the front are provided, respectively, and the radiator and the oil cooler and an intercooler as a cooling device in front of the cooling fan is provided between the radiator and the cooling air inlet, wherein A fuel tank storing fuel to be supplied to the engine is disposed at a position where cooling air taken in from the cooling air intake port flows by the action of the cooling fan, and the intercooler and oil are disposed between the fuel tank and the radiator. A cooler is arranged, and an air inlet is provided on the side wall of the stairs for ascending and descending provided on the outer side of the cooling air inlet and the side wall on the side opposite to the driver's cab and the driver's cab on the left end of the cylindrical frame. In claim 1, the intercooler is provided. In claim 2, the upper half of the oil cooler is provided. Halves and intercooler on the Rukura is is characterized by being located above the upper surface of the fuel tank. Furthermore, the front end portion of the left cylindrical frame and the air inlet of the elevating staircase may be provided only in a side surface portion facing the side wall on the cab side, and the cooling air is provided below the fuel tank. It is also possible to provide an air passage through which the air flows.

  According to the construction machine of the present invention, the fuel tank is directly cooled by the air (outside air) taken from the cooling air suction port by the action of the cooling fan, so that the high-temperature fuel returning from the return pipe to the fuel tank is efficiently obtained. Can be cooled sufficiently. Further, by providing the intercooler or the oil cooler above the fuel tank, the intercooler or the oil cooler can be effectively cooled by the air taken in from the cooling air suction port. Furthermore, by flowing cooling air also below the fuel tank, the fuel can be efficiently cooled even when the fuel in the fuel tank is small.

  FIG. 1 to FIG. 6 are diagrams showing an embodiment of the construction machine according to the present invention. FIG. 1 is a side view of the main part of the pile driver, FIG. 2 is a plan view of the pile driver, and FIG. 4 is a side view of the main part of the engine room, FIG. 5 is a plan view of the main part of the engine room, and FIG. 6 is a front view of the engine room. FIG. 7 is a cross-sectional view of an essential part of an engine room showing another embodiment.

  The construction machine 10 includes a lower traveling body 12 including a crawler 11 and an upper revolving body 13 that is turnably provided on the lower traveling body 12. Equipment (not shown), such as a working device and a crane jib and boom.

Upper slewing body 13, cab 14 to the right floor frames 13a formed by combining a hollow tubular member, and an engine compartment 15 on the left side is respectively provided, the cab 14 and an engine compartment 15 A device (not shown) such as a winch is disposed between them. Inside the engine chamber 15, an engine 16 is disposed in the center in the longitudinal direction of the vehicle body, a hydraulic pump 17 is provided behind the engine 16, and a cooling fan 18 is provided in front. A radiator 19, an oil cooler 20, and an intercooler 21 serving as a cooling device are provided in front of the cooling fan 18, and a fuel tank 22 is disposed at a front position on the suction side of the radiator 19. Further, a staircase 23 formed by bending a plate material is provided at an upper front portion of the engine chamber 15.

  A cooling air intake port 24 having a large number of through holes opened forward is provided in the vehicle body front wall 15a in front of the fuel tank 22 at the foremost part of the engine chamber 15, and the rear side of the engine chamber 15 Is provided with an exhaust port (not shown). When the engine 16 operates and the cooling fan 18 starts to rotate, the cooling fan 18 acts to take outside air from the cooling air intake port 24 and pass through the periphery of the fuel tank 22. It passes through the cooler 20 and the radiator 19, and further passes around the engine 16 and the hydraulic pump 17, and is discharged to the outside from the exhaust port on the rear side.

  In this way, outside air (cooling air) taken into the engine chamber 15 from the cooling air intake port 24 flows between these and the cooling air intake port 24 in front of the radiator 19, the oil cooler 20, and the intercooler 21. By disposing the fuel tank 22 at a position, it passes through the radiator 19, the oil cooler 20, and the intercooler 21, and the outside air having a low temperature directly cools the fuel tank 22 instead of the air that has been heated by cooling them. It will be. Therefore, even when the common rail fuel injection system is adopted for the engine 16 and the temperature of the fuel returning from the engine 16 to the fuel tank through the return line is high, the fuel can be cooled well by the outside air. Therefore, it is possible to prevent the engine output and durability from being lowered. Further, by disposing the intercooler 21 that is high in temperature above the upper surface of the fuel tank 22, it is possible to effectively guide the low-temperature outside air to the intercooler 21, and the engine intake air that has become high temperature in the supercharger. Can be cooled satisfactorily.

  Further, as shown in another embodiment of FIG. 7, the interior of the floor frame 13a made of a hollow cylindrical member is communicated with the interior of the engine chamber 15, and the air inflow portion 25 is provided on the front end side wall of the floor frame 13a. By providing the air passage 26 at the lower part of the fuel tank 22, the entire fuel tank 22 can be efficiently cooled, and the fuel can be cooled well even when the amount of fuel stored in the fuel tank 22 is small. be able to. At this time, by providing the air inflow portion 25 only on the side wall 13b of the floor frame 13a on the inner side of the vehicle body (on the cab 14), it is possible to suppress the spread of the intake sound in the vehicle body outer direction. Further, by providing the air inflow portion 25 only toward the inside of the vehicle body, the appearance is not impaired.

  Further, when the staircase 23 is provided in the upper front part of the engine chamber 15, the air inlet 28 can be provided also in the engine chamber wall portion 27 located on the back side of the staircase 23. At this time, as described above, the opening of the outside of the vehicle body of the stairs 23 is closed with a plate material, and only the inside of the vehicle body of the stairs 23 is opened to allow outside air to flow from the inside of the vehicle body, thereby suppressing the spread of the intake sound to the outside. it can. Further, since the outside air flowing into the engine chamber 15 from the air inlet 28 provided on the back side of the upper stairs is directly guided to the intercooler 21, the cooling effect in the intercooler 21 can be further improved.

  In addition, this invention is applicable to other various construction machines, such as a pile driver, a crane, a hydraulic excavator, and a bulldozer. Furthermore, in this embodiment, the engine room is arranged in the front-rear direction, but it may be in the left-right direction (width direction).

It is a principal part side view which shows the example of 1 form which applied this invention to the pile driver. It is a top view of a pile driver similarly. It is a front view of a pile driver similarly. It is a principal part side view of the engine room of a pile driver similarly. It is a principal part top view of an engine room similarly. It is a front view of an engine room similarly. It is principal part sectional drawing of the engine room which shows another form example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Pile driver, 11 ... Crawler, 12 ... Lower traveling body, 13 ... Upper turning body, 13a ... Floor frame, 14 ... Driver's cab, 15 ... Engine room, 15a ... Car body front wall, 16 ... Engine, 17 ... Hydraulic pressure Pump, 18 ... Cooling fan, 19 ... Radiator, 20 ... Oil cooler, 21 ... Intercooler, 22 ... Fuel tank, 23 ... Stair, 23a ... Car body front wall, 24 ... Cooling air intake port, 25 ... Air inlet, 26 ... Air passage, 27 ... Engine chamber wall, 28 ... Air inlet

Claims (5)

The upper revolving structure provided on the lower traveling body is provided with a cab and an engine compartment, and an engine, a radiator and a cooling fan are accommodated in the engine compartment, and the engine compartment is located on the suction side of the radiator. In a construction machine with a cooling air suction port at the front and an exhaust port at the rear ,
The upper swing body is provided with the cab on the right side of the floor frame formed by combining hollow cylindrical members and the engine room on the left side, and between the cab and the engine room. Work equipment is placed in
Communicating between the engine room and the left cylindrical frame in which the engine room is installed;
In the engine room, an engine is disposed at the center in the longitudinal direction of the vehicle body, a hydraulic pump is provided at the rear of the engine, and the cooling fan is provided at the front. A cooler and an intercooler are provided,
Said cooling air inlet and between said radiator, a position through which cooling air taken from the cooling air inlet by the action of the cooling fan, along with arranging the fuel tank that stores fuel supplied to the engine, the The intercooler and the oil cooler are disposed between the fuel tank and the radiator,
The intercooler is disposed above the upper surface of the fuel tank,
An air inflow port is provided on each of the side wall of the stairs for ascending / descending provided on the side opposite to the driver's cab and the driver's cab at the front end of the left cylindrical frame and on the outside of the cooling air inlet. And construction machinery. The upper revolving structure provided on the lower traveling body is provided with a cab and an engine compartment, and an engine, a radiator and a cooling fan are accommodated in the engine compartment, and the engine compartment is located on the suction side of the radiator. In a construction machine with a cooling air suction port at the front and an exhaust port at the rear,
The upper swing body is provided with the cab on the right side of the floor frame formed by combining hollow cylindrical members and the engine room on the left side, and between the cab and the engine room. Work equipment is placed in
Communicating between the engine room and the left cylindrical frame in which the engine room is installed;
In the engine room, an engine is disposed at the center in the longitudinal direction of the vehicle body, a hydraulic pump is provided at the rear of the engine, and the cooling fan is provided at the front. A cooler and an intercooler are provided,
A fuel tank storing fuel to be supplied to the engine is disposed between the cooling air inlet and the radiator at a position where cooling air taken in from the cooling air inlet by the action of the cooling fan flows. The intercooler and the oil cooler are disposed between the fuel tank and the radiator,
The upper half of the oil cooler is disposed above the upper surface of the fuel tank,
An air inflow port is provided on each of the side wall of the stairs for ascending / descending provided on the side opposite to the driver's cab and the driver's cab at the front end of the left cylindrical frame and on the outside of the cooling air inlet. construction machinery shall be the. The upper revolving structure provided on the lower traveling body is provided with a cab and an engine compartment, and an engine, a radiator and a cooling fan are accommodated in the engine compartment, and the engine compartment is located on the suction side of the radiator. In a construction machine with a cooling air suction port at the front and an exhaust port at the rear,
The upper swing body is provided with the cab on the right side of the floor frame formed by combining hollow cylindrical members and the engine room on the left side, and between the cab and the engine room. Work equipment is placed in
Communicating between the engine room and the left cylindrical frame in which the engine room is installed;
In the engine room, an engine is disposed at the center in the longitudinal direction of the vehicle body, a hydraulic pump is provided at the rear of the engine, and the cooling fan is provided at the front. The radiator and the oil serving as a cooling device are provided at the front of the cooling fan. A cooler and an intercooler are provided,
A fuel tank storing fuel to be supplied to the engine is disposed between the cooling air inlet and the radiator at a position where cooling air taken in from the cooling air inlet by the action of the cooling fan flows. The intercooler and the oil cooler are disposed between the fuel tank and the radiator,
The upper half of the oil cooler and the intercooler are disposed above the upper surface of the fuel tank,
An air inflow port is provided on each of the side wall of the stairs for ascending / descending provided on the side opposite to the driver's cab and the driver's cab at the front end of the left cylindrical frame and on the outside of the cooling air inlet. construction machinery shall be the. Tip and the air inlet of the elevating stairs of the left tubular frame, any one of claims 1 to 3, characterized in that is provided only on the side surface facing the side wall of the cab side The construction machine described in the item . The construction machine according to any one of claims 1 to 4 , wherein an air passage through which the cooling air flows is provided in a lower part of the fuel tank .

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