JP2006089937A - Oil cooler piping structure of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil cooler piping structure of a construction machine capable of preventing a cooling fan and an engine portion from being contaminated by a hydraulic oil leaking from a joint portion. <P>SOLUTION: An inflow side extension pipe 24 allowing the hydraulic oil to flow in and an outflow side extension pipe 25 allowing the hydraulic oil to flow out which are formed of a metal are installed integrally with a cooling fan 17 installed in an engine room 7 and inducing cooling air and an oil cooler 9 disposed on the upstream side of an engine 16 driving the cooling fan 17 with their opening ends positioned on the outside of the engine room 7. The opening end of the inflow side extension pipe 24 is connected to the inflow side pipe 20 through a first joint 22, and the opening end of the outflow side extension pipe 25 is connected to the outflow side pipe 21 through a second joint 23. An opening 26 allowing the insertion of the inflow side extension pipe 25 therein is formed in a building cover 19, and the opening part 26 is set to a size allowing the retrieval of the oil cooler 9 disposed in the engine room 7 from the engine room 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a piping structure provided in a construction machine such as a hydraulic excavator and connected to an oil cooler that cools hydraulic oil.

Conventionally, there exists a thing of patent document 1 as this kind of prior art. This prior art cools a heat exchanger, that is, a radiator that cools engine cooling water, an oil cooler that cools hydraulic oil, and an intercooler in a cooling air passage chamber located upstream of a cooling fan driven by the engine. It is the structure arranged in parallel so that it might orthogonally cross with respect to the flow direction of a wind.
The upper part of the oil cooler is provided with a joint for guiding the hydraulic oil, that is, a flange constituting the first joint, and the lower part is provided with a joint on the side for allowing the cooled hydraulic oil to flow, ie, the second joint. The flange that constitutes the joint is attached.

  The end of the inflow side pipe that guides the hydraulic oil to the oil cooler and the end of the outflow side pipe that allows the cooled hydraulic oil to flow out of the oil cooler also fit the flanges that constitute the first joint and the second joint. The flange constituting the first joint and the flange at the end of the inflow side pipe are fastened with bolts. Similarly, the flange constituting the second joint and the flange at the end of the outflow side pipe are bolts It is concluded with.

JP 2003-136972 A

  In the above-described prior art, the first joint composed of a flange connecting the hydraulic oil inflow side pipe and the oil cooler and the second joint consisting of the flange connecting the hydraulic oil outflow side pipe and the oil cooler are the oil cooler. It is attached to each of the upper part and the lower part. That is, since the first joint and the second joint are disposed in the cooling air passage chamber in which the oil cooler is disposed, there is a possibility that the cooling air passage chamber is contaminated by the hydraulic oil.

  That is, when hydraulic fluid leaks from the first joint portion or the second joint portion for some reason, the leaked hydraulic fluid is mixed into the cooling air induced by the cooling fan disposed downstream of the oil cooler. There is a concern that the cooling fan part and the engine part may be contaminated by the hydraulic oil by passing through the cooling fan part and flying to the place where the engine for driving the cooling fan is stored.

  As described above, when the cooling fan or the engine portion is contaminated by the hydraulic oil leaked from the first joint and the second joint, a complicated removal work for removing the attached hydraulic oil is required.

  The present invention has been made from the above-described actual state of the prior art, and an object thereof is to provide a cooling fan due to hydraulic fluid leaking from a joint portion and an oil cooler piping structure of a construction machine that can prevent contamination of an engine portion. There is to do.

  In order to achieve the above object, the present invention provides hydraulic oil to a cooling fan that is provided in a cooling air passage chamber and induces cooling air, and an oil cooler that is disposed upstream of an engine that drives the cooling fan. In an oil cooler piping structure of a construction machine, in which an inflow side pipe that leads is connected via a first joint and an outflow side pipe that discharges cooled hydraulic oil is connected via a second joint, the oil cooler is integrated with the oil cooler. And provided with an inflow side extending pipe for guiding the working oil and an outflow side extending pipe for allowing the working oil to flow out, the opening ends being respectively positioned outside the cooling air passage chamber. The open end of the pipe and the inflow side pipe are connected via the first joint, and the open end of the outflow side extension pipe and the outflow side pipe are connected via the second joint. Yes.

  The present invention configured as described above includes a first joint that connects an inflow side extension pipe provided integrally with an oil cooler and an inflow side pipe for hydraulic oil, and an outflow side extension pipe provided integrally with the oil cooler. Since the second joint for connecting the hydraulic oil outlet pipe is located outside the cooling air passage chamber in which the oil cooler, the cooling fan, and the engine are housed, the first joint or the second joint for some reason. When the hydraulic fluid leaks from the joint, the leaked hydraulic fluid contaminates the vicinity of the first joint or the second joint outside the cooling air passage chamber with the hydraulic fluid, but cooling with the leaked hydraulic fluid. Contamination of the cooling fan and engine disposed in the air passage chamber can be prevented.

  The present invention is characterized in that, in the above invention, the first joint and the second joint are positioned in the vicinity of a building cover forming the cooling air passage chamber.

  In the present invention configured as described above, since the first joint and the second joint are located in the vicinity of the building cover that forms the cooling air passage chamber, the hydraulic oil inflow side piping and the outflow side piping are arranged along the building cover. The length of the pipe to the tank or the like can be set relatively short.

  In the present invention, the present invention is characterized in that the building cover is formed with an opening that allows insertion of at least one of the inflow side extension pipe and the outflow side extension pipe.

  The present invention configured as described above can project the corresponding one of the inflow side extension pipe and the outflow side extension pipe to the outside of the building cover through the opening of the building cover. The pipe length of the corresponding one of the side extension pipe and the outflow side extension pipe can be set relatively short.

  Further, the present invention is characterized in that, in the above-mentioned invention, the opening is set to a size that allows the oil cooler disposed in the cooling air passage chamber to be taken out from the cooling air passage chamber.

  In the present invention configured as described above, when the oil cooler is taken out from the cooling air passage chamber for cleaning or the like, the first joint that connected the inflow side extension pipe and the inflow side pipe, and the outflow side extension are provided. By loosening the second joint that connected the outlet pipe and the outflow side pipe, the corresponding one of the inflow side extension pipe and the outflow side extension pipe inserted through the opening is removed from the opening. The oil cooler can be taken out from the cooling air passage chamber while being pulled out. When the oil cooler is accommodated in the cooling air passage chamber, it can be easily accommodated in the reverse procedure.

  Further, the present invention is characterized in that in the above invention, a closing member for closing a gap formed in the opening is provided.

  In the present invention configured as described above, a gap between the opening and the corresponding one of the inflow-side extension pipe and the outflow-side extension pipe inserted through the opening is closed by the closing member. The air passage chamber can be held in a sealed state, and leakage of the cooling air in the cooling air passage chamber to the outside can be prevented.

  The present invention relates to an inflow side extension pipe, an outflow side extension pipe, and an inflow side pipe and an outflow side pipe, which are provided integrally with an oil cooler, in a first joint, Since the two joints are connected to each other, even if the hydraulic fluid leaks from the first joint or the second joint, the cooling fan and engine parts are prevented from being contaminated by the leaked hydraulic fluid. Therefore, the cooling fan and the engine part can be kept in a clean state where no hydraulic oil adheres at all times. Therefore, the complicated removal operation | work which removes the hydraulic oil adhering to the cooling fan and engine part which was concerned about conventionally can be made unnecessary.

  Hereinafter, the best mode for carrying out an oil cooler piping structure for a construction machine according to the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing a hydraulic excavator cited as an example of a construction machine provided with an embodiment of an oil cooler piping structure according to the present invention.

  The hydraulic excavator shown in FIG. 1 includes a traveling body 1, a revolving body 2 disposed on the traveling body 1, a boom 3 connected to the revolving body 2 so as to be rotatable in the vertical direction, and the boom 3 The arm 4 is connected to the arm 4 so as to be pivotable in the vertical direction, and the bucket 5 is coupled to the arm 4 so as to be pivotable in the vertical direction. The boom 3, the arm 4, and the bucket 5 constitute a working machine that performs soil excavation work and the like.

  A cab 6 is provided at a front position of the revolving structure 2, and an engine chamber 7 and a counterweight 8 are provided at a rear position. The engine chamber 7 constitutes a cooling air passage chamber in which this embodiment of an oil cooler piping structure to be described later is disposed.

  2 is an enlarged view taken along arrow A in FIG. 1, and FIG. 3 is a view seen from the direction B in FIG.

  As shown in FIG. 2, an engine 16 and a cooling fan 17 driven by the engine 16 are disposed in the engine compartment 7, and a heat exchanger is disposed upstream of the engine 16 and the cooling fan 17. Is arranged. That is, the oil cooler 9 that cools the hydraulic oil, the radiator 10 that cools the cooling water of the engine 16, and the intercooler 11 that cools the engine intake air supplied by the charger of the engine 16 are led to the air introduction unit 18. They are arranged side by side so as to be orthogonal to the flow of cooling air. The oil cooler 9, the radiator 10, and the intercooler 11 are sealed with a sealing material 12.

  A fan shroud 13 for guiding cooling air is disposed downstream of the oil cooler 9, the radiator 10, and the intercooler 11, and the fan ring 14 disposed downstream of the fan shroud 13 is interposed between the fan ring 14 and the fan shroud 13. The above-described cooling fan 17, that is, the cooling fan 17 for inducing cooling air is arranged so as to have a predetermined gap. The above-described engine 16 that drives the cooling fan 17 is arranged in the engine housing portion 15 downstream of the cooling fan 17.

  This embodiment of the oil cooler piping structure is arranged in the vicinity of the building cover 19 on the cab 6 side that forms the engine chamber 7 described above. As shown in FIG. 3, the present embodiment is provided integrally with the upper portion of the oil cooler 9 and has an open end positioned outside the building cover 19 that forms the engine compartment 7, and is made of metal. An outflow side that is provided integrally with an inflow side extension pipe 24 that leads to the cooler 9 and a lower portion of the oil cooler 9, has an open end located outside the building cover, and is made of metal and flows out the cooled working oil An extension tube 25 is provided. Moreover, the 1st joint 22 which connects the opening end of the inflow side extension pipe 24 and the inflow side piping 20 extended along the building cover 19, the opening end of the outflow side extension pipe 25, and a building A second joint 23 is provided to connect the outflow side pipe 21 extending along the cover 19. That is, the first joint 22 and the second joint 23 are located in the vicinity of the building cover 19 on the cab 6 side that forms the engine compartment 7.

  In the present embodiment, the building cover 19 is formed with an opening 26 that allows insertion of at least one of the inflow side extension pipe 24 and the outflow side extension pipe 25, for example, the outflow side extension pipe 25. It is. The shape of the opening 26 is set to a size that allows the oil cooler 9 disposed in the engine chamber 7 to be removed from the engine chamber 7. In addition, a clogging member 27 is provided to block a gap formed in the opening 26, that is, a gap formed around the outflow side extension pipe 25 inserted through the opening 26. The closing member 27 is formed in a sheet shape having a slit 28 that allows the outflow side extension pipe 25 to be inserted, and is made of an elastic member made of, for example, a synthetic resin, and is formed inside the building cover 19 in the engine compartment 7. Affixed.

  For example, hydraulic oil that has been used to drive the hydraulic actuator and has reached a high temperature is guided to the oil cooler 9 via the inflow side pipe 20, the first joint 22, and the inflow side extension pipe 24. Cooling is performed by cooling air introduced into the engine compartment 7 from the air introduction portion 18 shown in FIG. The cooled hydraulic oil is returned from the oil cooler 9 to the tank, for example, through the outflow side extension pipe 25, the second joint 23, and the outflow side pipe 21.

  In the present embodiment, an inflow side extension pipe 24 provided integrally with the oil cooler 9, a first joint 22 connecting the inflow side pipe 20 of hydraulic oil, and an outflow side extension provided integrally with the oil cooler 9. Since the second joint 23 connecting the pipe 25 and the hydraulic oil outflow side pipe 21 is located outside the building cover 19 of the engine compartment 7 in which the oil cooler 9, the cooling fan 17, and the engine 16 are accommodated, respectively. If the hydraulic fluid leaks from the first joint 22 or the second joint 23 for some reason, the first joint 22 or the second joint outside the building cover 19 of the engine compartment 7 is caused by the leaked hydraulic fluid. Although the vicinity of the joint 23 is contaminated, the cooling fan 17 disposed in the engine room 7 and the engine 16 can be prevented from being contaminated by the leaked hydraulic oil. It is possible to maintain the fine engine 16 portion in a clean state without attachment of hydraulic oil. Therefore, the complicated removal operation | work which removes the hydraulic oil adhering to the cooling fan 17 and the engine 16 part can be made unnecessary.

  As described above, in the operation of removing the hydraulic oil when the periphery of the first joint 22 and the second joint 23 is contaminated by the hydraulic oil leaked from the first joint 22 or the second joint 23, mainly, Since the building cover 19, the inflow side pipe 20, the outflow side pipe 21, the frame portion of the revolving structure 2, etc. may be performed in a simple part, the cooling fan 17 disposed in the engine room 7 having a complicated structure, the engine Compared to the operation of removing 16 parts of hydraulic oil, it is simple.

  Further, in the present embodiment, since the first joint 22 and the second joint 23 are located in the vicinity of the building cover 19 of the engine room 7, the inflow side pipe 20 and the outflow side pipe 21 are extended along the building cover 19. It is possible to set the pipe length to the tank or the like relatively short.

  Further, in the present embodiment, a corresponding one of the inflow side extension pipe 24 and the outflow side extension pipe 25, for example, the outflow side extension pipe 25 is placed outside the building cover 19 through the opening 26 of the building cover 19. It can project, and the pipe line length of this outflow side extension pipe 25 can be set up comparatively short.

  In the present embodiment, when the oil cooler 9 is taken out of the engine chamber 7 for cleaning or the like, for example, the upper plate portion of the fan shroud 13 shown in FIG. And the second joint 23 that has connected the outflow side extension pipe 25 and the outflow side pipe 21, and the second joint 23 that has connected the outflow side extension pipe 25 and the outflow side pipe 21. Loosen. The oil cooler 9 can be taken out from the engine chamber 7 by lifting the entire oil cooler 9 while pulling out the outflow side extension pipe 24 inserted through the opening 26 to the inside of the engine chamber 7. When the oil cooler 9 is accommodated in the engine compartment 7, it can be easily accommodated in the reverse procedure.

  Further, in the present embodiment, since the gap between the opening 26 formed in the building cover 19 and the inflow side extension pipe 24 inserted through the opening 26 is blocked by the closing member 27, the engine chamber 7 is sealed. It is possible to prevent the cooling air in the engine chamber 7 from leaking to the outside, which contributes to an improvement in cooling efficiency.

It is a side view which shows the hydraulic excavator mentioned as an example of the construction machine with which one Embodiment of the oil cooler piping structure which concerns on this invention is provided. It is A arrow enlarged view of FIG. It is the figure seen from the B direction of FIG.

Explanation of symbols

2 Revolving body 6 Cab 7 Engine room (cooling air passage room)
DESCRIPTION OF SYMBOLS 9 Oil cooler 15 Engine storage part 16 Engine 17 Cooling fan 18 Air introduction part 19 Building cover 20 Inflow side piping 21 Outflow side piping 22 1st joint 23 2nd joint 24 Inflow side extension pipe 25 Outflow side extension pipe 26 Opening part 27 Closing member 28 Slit

Claims (5)

A cooling fan that is provided in the cooling air passage chamber and induces the cooling air, and an oil cooler that is disposed on the upstream side of the engine that drives the cooling fan, an inflow side pipe that guides the working oil is provided via the first joint, Also, in the oil cooler piping structure of the construction machine that connects the outflow side piping through which the cooled hydraulic oil flows out via the second joint,
Integrated with the oil cooler, each of the open ends is positioned outside the cooling air passage chamber, and is provided with an inflow side extension pipe that is made of metal and guides hydraulic oil, and an outflow side extension pipe that discharges the hydraulic oil,
The open end of the inflow side extension pipe and the inflow side pipe are connected via the first joint, and the open end of the outflow side extension pipe and the outflow side pipe are connected via the second joint. An oil cooler piping structure for a construction machine. In the invention of claim 1,
An oil cooler piping structure for a construction machine, wherein the first joint and the second joint are positioned in the vicinity of a building cover that forms the cooling air passage chamber. In the invention of claim 2,
An oil cooler piping structure for a construction machine, wherein an opening that allows insertion of at least one of the inflow side extension pipe and the outflow side extension pipe is formed in the building cover. In the invention of claim 3,
An oil cooler piping structure for a construction machine, wherein the opening is set to a size that allows the oil cooler disposed in the cooling air passage chamber to be taken out from the cooling air passage chamber. In the invention of claim 4,
An oil cooler piping structure for a construction machine, comprising a closing member that closes a gap formed in the opening.

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