JP2593642Y2 - Piping structure of oil cooler for construction machinery - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piping structure of an oil cooler for a hydraulic oil mounted on a construction machine such as a hydraulic shovel or a work vehicle.

[0002]

2. Description of the Related Art FIG. 4 is a rear view of an essential part of a hydraulic excavator with a partially cutout. In the figure, 1 is a lower traveling body of a hydraulic excavator, 2 is an upper revolving superstructure, 3 is a guard plate forming an outer peripheral surface of the upper revolving superstructure 2, 4 is a cooling air intake, 5 is a discharge port, and 6 is a discharge port. Engine room, 7 is a water-cooled engine, 8 is a cooling fan, 9 is a radiator, 10 is an oil cooler, 11
Denotes an engine hood, and 12 denotes a hydraulic pump driven by the engine 7. FIG. 5 is a plan view of a partially cut-away main part viewed from A in FIG. In the figure, reference numeral 13 denotes a counterweight provided at the rear end of the upper swing body 2;
4 is a tank of hydraulic oil, 15 is a turning motor, 16 is a control valve for controlling various hydraulic actuators, 17 is an air cleaner for intake of the engine, and 18 is a partition wall interposed between the engine 7 and the control valve 16. Reference numeral 19 denotes a sound absorbing material attached to the inner surface side of the engine room 6, 20 denotes a turbocharger of the engine 7, 21 denotes an exhaust pipe, and 22 denotes a muffler. FIG. 6 is a perspective view of a main part showing the periphery of the engine 7 (indicated by phantom lines) when the partition plate 18 in FIG. 5 is not provided. In the figure, reference numeral 23 denotes an inlet pipe of the oil cooler 10 into which hydraulic oil for hydraulic circuit flows, 24 denotes an outlet pipe, 25 and 26 denote hydraulic pipes (including hydraulic hoses), respectively, and 27 denotes an inlet pipe 23 and a hydraulic pipe 25. Is a coupling that connects the outlet pipe 24 and the hydraulic pipe 26.

As shown in FIG. 4, in a hydraulic excavator, a radiator 9 and an oil cooler 10 are provided inside an upper revolving unit 2 and a cooling air inlet 4 is provided on one side of a guard plate 3 on an outer peripheral surface of the upper revolving unit. And a discharge port 5 on the other side. As shown in FIG. 6, the hydraulic oil in the hydraulic circuit of the hydraulic shovel is supplied with a hydraulic pipe 25, a coupling 27, an inlet pipe 23, an oil pipe (not shown) in the oil cooler 10, an outlet pipe 24, a coupling 28, Piping 2
6 and returned to the tank 14. That is, during operation of the hydraulic excavator, heated engine cooling water passes through the radiator 9, and return oil of the operating oil whose temperature has increased passes through the oil pipe of the oil cooler 10. Since the fan 8 is rotated by the rotation of the engine 7, external air is sucked in from the suction port 4, and flows in the directions of arrows A, B, C, D, and E (shown in FIG. 4). Since the heat exchange is performed through the radiator 9, the working oil and the engine cooling water can be cooled.

[0004]

In the oil cooler of the prior art, a hydraulic pipe is connected to an outlet / inlet pipe for outflow / inflow of hydraulic oil via a coupling. The arrangement position of the coupling is close to the oil cooler and close to the air passage of the air passing through the oil cooler. In this state, if the coupling becomes loose due to any cause, for example, vibration, etc., the hydraulic oil leaked or ejected from the coupling is sucked in by the fan, and the components of the atomized hydraulic oil are converted into the components of the engine turbocharger, muffler, There was a risk of a fire accident due to ignition due to a heated part such as an exhaust pipe. The purpose of the present invention is to solve the above problems.

[0005]

In the piping structure of the present invention,
The coupling of the hydraulic oil inlet / outlet of the oil cooler is arranged so as to be separated to a position where when the hydraulic oil is jetted from the coupling portion, the jetted hydraulic oil is mixed with air and is not sucked by the fan. Alternatively, a coupling for the hydraulic oil inlet / outlet of the oil cooler is provided outside the partition plate forming the engine compartment. Alternatively,
The hydraulic oil inlet / outlet coupling of the oil cooler is inserted into each of the holes of the tube member, and the oil cooler side end of each of the tube members is oil-tightly fastened to the outer periphery of the hydraulic oil inlet / outlet pipe of the oil cooler. The other end of the tube member was positioned outside the partition plate of the engine compartment, and the tube member was opened with the hydraulic pipe inserted through the hole.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing a main part of an oil cooler 10a having a piping structure according to a first aspect of the present invention. In the drawings, the same reference numerals are given to components using the same components as the conventional technology. 23a is an inlet pipe of the oil cooler 10a into which hydraulic oil for hydraulic circuit flows, 24a is an outlet pipe, 25a and 26a are hydraulic pipes (including hydraulic hoses), 27 is an inlet pipe 23a and a hydraulic pipe 25.
a, the outlet pipe 2
4a and a coupling connecting the hydraulic pipe 26a.

Next, the piping structure of the first embodiment of the present invention and its operation will be described with reference to FIG. In the piping structure of claim 1,
Coupling 28 at the working oil port of oil cooler 10a
And 27 are arranged such that when the operating oil is ejected from the couplings 28 and 27, the ejected operating oil mixes with the air and is not sucked by the fan.
That is, since the arrangement positions of the couplings 28 and 27 are set at positions far away from the oil cooler 10a, no coupling exists in the ventilation path of the cooling air passing through the oil cooler 10a. Therefore, coupling 28
Even if hydraulic oil leaks or gushes due to vibrations or the like, the fan does not suck in the leaked hydraulic oil. Therefore, since the hydraulic oil is not ignited in the high heat portion of the engine, a fire accident can be prevented.

FIG. 2 is a perspective view of a main part of an oil cooler 10b having a piping structure according to a second aspect of the present invention.
In the figure, 23b is an inlet pipe of an oil cooler 10b into which hydraulic oil for hydraulic circuit flows, 24b is an outlet pipe,
Reference numeral 29 denotes a partition plate that forms a part of a wall surface of an engine room (the engine room and the engine are not shown), reference numeral 30 denotes a piping hole formed in the partition plate 29, and reference numerals 25b and 26b denote hydraulic piping (a hydraulic hose, respectively). ), 27 is the inlet pipe 23
b and the coupling connecting the hydraulic pipe 25b, 2
Reference numeral 8 denotes a coupling connecting the outlet pipe 24b and the hydraulic pipe 26b.

Next, the piping structure according to the second aspect of the present invention and its operation will be described with reference to FIG. In the piping structure of claim 2,
Couplings 28 and 2 for the working oil port of the oil cooler 10b are provided outside the partition plate 29 forming the engine chamber.
7 was installed. That is, the outlet pipe 24b and the inlet pipe 23b were set to be long, and were made to penetrate the piping holes 30 of the partition plate 29, and the connection portions at the tips extended outside the partition plate 29. As a result, the couplings 28 and 27 are located outside the partition plate 29 and are not affected by the cooling air. For this reason, even when the couplings 28 and 27 are loosened due to vibration or the like and the hydraulic oil leaks or spouts out, the fan does not suck the leaked hydraulic oil. Therefore, since the hydraulic oil is not ignited in the high heat portion of the engine, a fire accident can be prevented.

Next, FIG. 3 is a perspective view showing a main part of an oil cooler 10c having a piping structure according to a third aspect of the present invention.
In the figure, 23C is an inlet pipe of an oil cooler 10c into which hydraulic oil for a hydraulic circuit flows, 24c is an outlet pipe,
Reference numeral 29 'denotes a partition plate forming a part of a wall surface of an engine room (the engine room and the engine are not shown), 30' denotes a piping hole formed in the partition plate 29 ', and 25c and 26c denote hydraulic piping, respectively. (Including a hydraulic hose), 27 is a coupling connecting the inlet pipe 23c and the hydraulic pipe 25c, 28 is a coupling connecting the outlet pipe 24c and the hydraulic pipe 26c, and 31 and 32 are reasons for maintenance. Reference numeral 33 denotes a clamp member using a transparent material.

Next, a piping structure according to a third aspect of the present invention will be described with reference to FIG. The couplings 28 and 27 at the working oil port of the oil cooler 10c are connected to the tube members 32 and 3 respectively.
1 and the tube members 32, 31 respectively.
Of the oil cooler (10c) side of the
c, a clamp member 3 on the outer peripheral portion of the inlet pipe 23c.
3, the other ends of the tube members 32, 31 (indicated by f and G) are positioned outside the partition plate 29 ', and the hydraulic pipes 26c are respectively inserted into the holes of the tube members 32, 31. , 25c are inserted and opened.

Next, the operation of the piping structure according to the third aspect of the present invention will be described. In the piping structure of the third aspect, the tube members 32, 31 are put on the couplings 28, 27 of the inlet / outlet pipes (24c, 23c) of the oil cooler 10c, respectively, and the ends of the tube members 32, 31 on the oil cooler side are respectively set as described above. It is fastened to both pipes 24c, 23c. For this reason, even when the couplings 28 and 27 are loosened due to vibration or the like and the hydraulic oil is ejected, the ejected hydraulic oil passes through the holes of the tube members 32 and 31 and passes through the partition plate 2.
Guided outside 9 '. Therefore, since the hydraulic oil is not ignited in the high heat portion of the engine, a fire accident can be prevented.

[0013]

In the oil cooler of the prior art, the coupling of the hydraulic oil inlet / outlet is arranged at a position close to the oil cooler. If the coupling becomes loose due to vibrations in this state, the hydraulic oil spouted from the coupling is sucked in by the cooling fan, and the components of the atomized hydraulic oil are ignited by the hot parts of the engine, causing a fire accident. There was a fear. However, in the piping structure of the present invention, the coupling of the working oil inlet / outlet of the oil cooler is arranged at a position distant from the oil cooler or outside the partition plate forming the engine room. That is, there is no coupling in the ventilation path of the cooling air passing through the oil cooler. As a result, even when the coupling oil is loosened due to vibration or the like and the hydraulic oil is ejected, the ejected hydraulic oil is not sucked by the fan, so that the engine is not ignited by a high heat portion. Alternatively, in the present invention, a tube member is put on each of the couplings of the inlet / outlet pipes of the oil cooler, and the ends of the tube member on the oil cooler side are fastened to the two pipes, and the other end open side is guided to the outside of the partition plate. I did it. Thereby, even when the coupling oil is loosened due to vibration or the like and the hydraulic oil is jetted, the jetted hydraulic oil can be guided to the outside of the partition plate, that is, to a place where there is no high heat portion. Therefore, in a construction machine, a work vehicle or the like having the piping structure of the present invention, it is possible to prevent a fire accident caused by hydraulic oil leaking from the coupling of the oil cooler.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of an oil cooler having a piping structure according to a first embodiment of the present invention;

FIG. 2 is a perspective view of an essential part showing an oil cooler having a piping structure according to a second aspect of the present invention.

FIG. 3 is a perspective view of an essential part showing an oil cooler having a piping structure according to a third aspect of the present invention.

FIG. 4 is a rear view of an essential part of the hydraulic excavator with a partially cutaway.

FIG. 5 is a plan view of a partially cut-away main part viewed from A in FIG. 4;

6 is a perspective view of a main part showing the periphery of an engine when the partition plate in FIG. 5 is not provided.

[Explanation of symbols]

6 engine room 7 engine 8 fan 9 radiator 10, 10a, 10b, 10c oil cooler 14 tank 18, 29, 29 'partition plate 23, 23a, 23b, 23c inlet pipe 24, 24a, 24b, 24c outlet pipe 25, 25a, 25b, 25c, 26, 26a, 26
b, 26c Hydraulic piping 27, 28 Coupling 31, 32 Tube member 33 Clamp member

Claims (3)

(57) [Scope of request for utility model registration] A cooling air is sucked by a fan from a suction port provided on an outer peripheral surface of a vehicle body, the air is passed through a ventilation passage of an oil cooler and an engine room, and is discharged to the outside. hydraulic oil in the circuit in the hydraulic pipes of the oil cooler which is then returned to the tank through the oil cooler, the coupling of the hydraulic oil inlet and outlet of the oil cooler, hydraulic fluid from the coupling portion injection
When it comes out, the ejected hydraulic oil mixes with the air and
A piping structure for an oil cooler for a construction machine, wherein the piping is spaced apart from a position where it is not sucked by a fan . 2. A piping structure for an oil cooler for a construction machine according to claim 1, wherein a coupling for a working oil inlet / outlet of the oil cooler is arranged outside a partition plate forming an engine room. A piping structure of an oil cooler for construction machinery, characterized by being reduced. 3. A cooling air is sucked by a fan from a suction port provided on an outer peripheral surface portion of a vehicle body, the air is passed through a ventilation passage of an oil cooler and an engine room, and is discharged to the outside. In the hydraulic pipe of the oil cooler that returns the hydraulic oil in the circuit to the tank via the oil cooler, the coupling of the hydraulic oil inlet / outlet of the oil cooler is inserted into the hole of the tube member, and the oil cooler of the tube member is respectively inserted. Side of the oil cooler oil tight tightly to the outer periphery of the pipe of the hydraulic oil inlet and outlet,
A pipe structure for an oil cooler for a construction machine, wherein the other end of the tube member is positioned outside a partition plate of an engine room and is opened with a hydraulic pipe inserted into a hole of the tube member.