JP2001220770A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction machine allowing shortening of a piping system and centralization of parts included in a pressure oil cooling system. SOLUTION: The construction machine comprises an engine 4; a hydraulic pump 5 driven by the engine 4; an oil tank 13 for reserving pressure oil discharged from the hydraulic pump 5; a cooling fan 6 rotated by the engine 4; and a radiator 7 and an oil cooler 8 for cooling the oil flowing in a hydraulic circuit including the hydraulic pump 5 and a control valve 10 as the cooling fan 6 rotates. The hydraulic pump 5 is disposed between the engine 4 and the cooling fan 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine provided with a hydraulic pump such as a hydraulic shovel and a prime mover.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open No.
There is one disclosed in Japanese Patent No. 27097. 3 to 5
FIG. 3 is a side view showing a hydraulic excavator as an example of a construction machine, FIG. 4 is a plan view of a main part of FIG. 3, and FIG. 5 is a pressure diagram provided in the hydraulic excavator shown in FIG. It is a hydraulic circuit diagram showing an oil cooling system.

[0003] The hydraulic excavator shown in FIG.
And a revolving unit 2 arranged on the traveling unit 1.
The revolving unit 2 is provided with a machine room 3.

FIG. 4 shows a state in which the cover of the machine room 3 is removed. In the machine room 3, a prime mover, ie, an engine 4, a hydraulic pump 5 driven by the engine 4, and an engine 4 A rotating cooling fan 6,
A radiator 7 and an oil cooler 8 for cooling hydraulic oil flowing through a hydraulic circuit including the hydraulic pump 5 and the like as the cooling fan 6 rotates are arranged.

As shown in the pressure oil cooling system of FIG. 5, the pressure oil discharged from the hydraulic pump 5 is guided to a control valve 10 by a delivery pipe 9, and the return oil from the control valve 10 is fed to an oil cooler pipe 11. Is guided to the oil cooler 8, where it is cooled by the heat radiation action of the radiator 7. The oil cooled by the oil cooler 8 is guided to an oil tank 13 by an oil tank pipe 12. The oil stored in the oil tank 13 is supplied to the hydraulic pump 5 through a suction pipe 14.

[0006]

In the prior art described above, the hydraulic pump 5 driven by the engine 4 is installed on the opposite side of the cooling fan 6 rotated by the engine 4, so that the hydraulic pump 5 There is a problem that the piping system for connecting the valve 10, the radiator 7, the oil cooler 8, and the oil tank 13 tends to be long, which increases the manufacturing cost. In addition, since hydraulic devices such as the radiator 7, the oil cooler 8, and the hydraulic pump 5 are dispersedly arranged at positions separated from each other, the layout design tends to be difficult. Further, as described above, since the respective hydraulic devices are arranged in a distributed manner and the piping system is lengthened, a relatively large installation space is required, and there is a problem that the shape of the revolving unit 2 is restricted by miniaturization. is there.

The present invention has been made in view of the above-mentioned circumstances in the prior art, and has as its object to shorten the piping system and to integrate components included in the pressure oil cooling system. To provide construction machinery.

[0008]

Means for Solving the Problems In order to achieve the above object, the invention according to claim 1 of the present application provides a motor, a hydraulic pump driven by the motor, and a hydraulic oil discharged from the hydraulic pump. Oil tank, a control valve to which pressure oil discharged from the hydraulic pump is supplied, a cooling fan rotated by the prime mover, and a hydraulic circuit including the hydraulic pump and the control valve as the cooling fan rotates. In a construction machine provided with a radiator for cooling pressurized oil flowing through the oil pump and an oil cooler, the hydraulic pump is arranged between the engine and the cooling fan.

According to the first aspect of the present invention, the hydraulic pump can be arranged close to the cooling fan, the radiator, and the oil cooler. The oil cooler piping connecting the valve and the oil cooler, the oil tank piping connecting the oil cooler and the tank, and the suction piping connecting the oil tank and the hydraulic pump can be shortened, respectively, and are included in these pressure oil cooling systems Parts can be compactly integrated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a construction machine according to the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of a main part of an embodiment of the present invention,
FIG. 2 is a hydraulic circuit diagram showing a pressure oil cooling system provided in the embodiment shown in FIG.

In FIGS. 1 and 2, parts equivalent to the parts described above are indicated by the same reference numerals. That is, 4 is an engine disposed in the machine room on the revolving superstructure, 5 is a hydraulic pump driven by the engine 4, 6 is a cooling fan rotated by the engine 4, 7 is a radiator that performs a heat radiation action, 10 is a control valve, 9 Is the hydraulic pump 5
A delivery pipe for supplying pressure oil discharged from the control valve 10 to the control valve 10, an oil cooler pipe 11 for connecting the control valve 10 to the oil cooler 8, an oil tank pipe 12 for connecting the oil cooler 8 to the oil tank 13, Reference numeral 14 denotes a suction pipe for connecting the oil tank 13 and the hydraulic pump 5.

In this embodiment, the hydraulic pump 5 is particularly arranged between the engine 4 and the cooling fan 6, that is, closer to the radiator 7 and the oil cooler 8.

In this embodiment, high-temperature oil flowing through the hydraulic circuit including the hydraulic pump 5 and the control valve 10 flows into the oil cooler 8 from the oil cooler pipe 11 and the rotation of the cooling fan 6 accompanying the driving of the engine 4. The oil is cooled by the oil cooler 8 by the heat radiation effect of the radiator 7. Further, the oil in the oil cooler 8 is guided to an oil tank 13 via an oil tank pipe 12.
The oil in the oil tank 13 is sucked into the hydraulic pump 5 via the suction pipe 14 as the hydraulic pump 5 is driven, and then supplied to the control valve 10 via the delivery pipe 9.

According to the present embodiment configured as described above,
Since the hydraulic pump 5 can be arranged at a position close to the cooling fan 6, the radiator 7, and the oil tank 8, the hydraulic pump 5
Delivery pipe 9, which communicates with the control valve 10,
An oil cooler pipe 12 connecting the control valve 10 and the oil cooler 8, an oil tank pipe 14 connecting the oil cooler 8 and the oil tank 13, an oil tank 1
The suction pipes 14 connecting the hydraulic pump 3 and the hydraulic pump 5 can be shortened.

As a result, the manufacturing cost can be reduced. Further, the hydraulic pump 5, the radiator 7, the oil cooler 8, and the like included in the pressure oil cooling system can be compactly integrated, so that the layout design on the revolving unit 2 can be easily performed.

Further, as described above, the hydraulic pump 5, radiator 7, oil cooler 8 and the like included in the pressure oil cooling system can be compactly integrated, and the delivery pipe 9, the oil cooler pipe 11, the oil tank pipe 12, the suction pipe 1
3 can be shortened, so that these installation spaces can be relatively small, and the revolving structure 2 forming the vehicle body in which various hydraulic devices included in the pressure oil cooling system are arranged can be made compact. .

In the above embodiment, a hydraulic excavator is described as an example of a construction machine. However, any construction machine having a hydraulic pump and a cooling fan included in a pressure oil cooling system can be used. is there.

[0019]

According to the first aspect of the present invention, since the piping system can be shortened, the manufacturing cost can be reduced, and the hydraulic pump, oil cooler, and the like included in the pressure oil cooling system can be used. Since the pressure oil cooling system can be centralized, the layout design of these hydraulic oil cooling systems is easier than before, and the installation space is relatively small, which allows the vehicle body on which various hydraulic devices included in the hydraulic oil cooling system are arranged to be installed. A compact shape can be realized.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of an embodiment of a construction machine according to the present invention.

FIG. 2 is a hydraulic circuit diagram showing a pressure oil cooling system provided in the embodiment shown in FIG.

FIG. 3 is a side view showing a hydraulic excavator as an example of a construction machine.

FIG. 4 is a plan view of a main part of FIG. 3;

FIG. 5 is a hydraulic circuit diagram showing a hydraulic oil cooling system provided in the hydraulic excavator shown in FIG.

[Explanation of symbols]

 4 Engine 5 Hydraulic pump 6 Cooling fan 7 Radiator 8 Oil cooler 9 Delivery pipe 10 Control valve 11 Oil cooler pipe 12 Oil tank pipe 13 Oil tank 14 Suction pipe

Claims (1)

[Claims] A motor, a hydraulic pump driven by the motor, an oil tank storing hydraulic oil discharged from the hydraulic pump, a control valve supplied with hydraulic oil discharged from the hydraulic pump, A construction machine comprising a cooling fan rotated by the prime mover, a radiator for cooling hydraulic oil flowing through a hydraulic circuit including the hydraulic pump and the control valve with the rotation of the cooling fan, and an oil cooler, wherein the hydraulic pump Is disposed between the engine and the cooling fan.