JP2014185423A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction machine in which heat balance is improved.SOLUTION: A construction machine includes an engine 20 that has a cooling fan 23 for generating cooling air 39, and an engine oil filter 40 that filters engine oil circulating in the engine 20. An engine oil cooler 50 for cooling the engine oil is provided in the middle of engine oil piping 41 that is provided between the engine 20 and the engine oil filter 40 and through which the engine oil flows, and in the middle of a flow channel of the cooling air 39.

Description

  The present invention relates to a construction machine that performs engine lubrication using engine oil.

  In general, an engine provided in a construction machine has a large number of drive parts such as pistons and crankshafts, and the drive parts are lubricated using engine oil so that the drive parts do not wear. (Patent Document 1).

JP 2008-196150 A

  Since engine oil circulates in the engine, its temperature rises with circulation. The engine oil is cooled by cooling water flowing through the engine.

  That is, conventionally, the temperature of the engine oil has only been dependent on the temperature of the cooling water. Therefore, when the temperature of the engine oil rises due to the driving state of the engine or the like, there is a problem that the cooling water alone is not enough to cool, and the heat balance may be lowered.

  This invention is made | formed in view of said point, and aims at providing the construction machine aiming at the improvement of heat balance.

From the first point of view, the above problem is
An engine having a cooling fan for generating cooling air;
A construction machine having an oil filter for filtering engine oil circulating in the engine,
The problem is solved by a construction machine characterized in that an oil cooler for cooling the engine oil is provided in the middle of the flow path of engine oil between the engine and the oil filter and in the middle of the flow path of the cooling air. Can do.

  According to the disclosed invention, the engine oil is cooled not only by the cooling water but also by the oil cooler, so that the heat balance performance can be improved.

FIG. 1 is an overall configuration diagram of a construction machine according to an embodiment of the present invention. FIG. 2 is a cross-sectional view schematically showing an engine room of a construction machine according to an embodiment of the present invention. FIG. 3 is a cross-sectional view schematically showing an engine room of a construction machine according to another embodiment.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a construction machine according to an embodiment of the present invention. In the present embodiment, a hydraulic excavator 1 will be described as an example of a construction machine.

  The hydraulic excavator 1 includes a crawler-type lower traveling body 2 capable of self-propelling, and an upper revolving body 3 that is rotatably mounted on the lower traveling body 2. A work attachment 4 is provided on the front side of the upper swing body 3.

  The work attachment 4 includes a boom 6, an arm 9, a bucket 10, and the like. The boom 6 is attached to the revolving frame 5 so as to be able to move up and down. The arm 9 is rotatably attached to the tip end side of the boom 6. Moreover, the bucket 10 is attached to the front end side of the arm 9 so that rotation is possible.

  The boom cylinder 12 is disposed between the turning frame 5 and the boom 6. The boom 6 moves up and down with respect to the revolving frame 5 by the boom cylinder 12. The arm cylinder 13 is disposed between the boom 6 and the arm 9. The arm 9 rotates with respect to the boom 6 by the arm cylinder 13. Further, the bucket cylinder 14 is disposed between the bucket 10 and the arm 9. The bucket 10 is rotated with respect to the arm 9 by the bucket cylinder 14.

  The upper revolving unit 3 is installed on the lower traveling unit 2 through a revolving mechanism 16 so as to be able to revolve. As shown in FIG. 2 in addition to FIG. 1, the upper swing body 3 includes a swing frame 5, a cab 8, a counterweight 15, an exterior cover (exterior body) 18, an engine 20, a heat exchange device 24, and an exhaust gas treatment device. 30, an engine oil filter 40, an engine oil cooler 50, and the like are disposed.

  The cab 8 is provided on the revolving frame 5, and a driver's seat (not shown) is provided therein. The operator sits on the driver's seat in the cab 8 and operates the hydraulic excavator 1.

  The counterweight 15 has a function of balancing the weight with the work attachment 4. The exterior cover 18 and the engine hood 17a cover the engine 20, the heat exchange device 24, the exhaust gas processing device 30 and the like disposed in the engine chamber 17.

  Next, the configuration inside the engine chamber 17 will be described.

  FIG. 2 is a schematic configuration diagram showing the internal configuration of the engine chamber 17. In the engine chamber 17, an engine 20, a heat exchange device 24, an exhaust gas treatment device 30, an engine oil filter 40, an engine oil cooler 50, and the like are disposed.

  The engine 20 is supported on an upper part of an engine mounting seat 21 disposed on the revolving frame 5 via a mount 22. The mount 22 is an anti-vibration mount and prevents vibration generated by the engine 20 from being transmitted to the turning frame 5.

  A cooling fan 23 is disposed on the X1 direction side (left side in the figure) of the engine 20. A heat exchange device 24 is disposed on the X1 direction side of the cooling fan 23.

  The cooling fan 23 is rotationally driven by the engine 20. When the cooling fan 23 is driven to rotate, outside air is taken into the engine chamber 17 as cooling air 39. The heat exchange device 24 performs heat exchange processing with the cooling air 39 taken into the engine chamber 17.

  The cooling air 39 flows in the right direction in the figure as indicated by the broken arrow in FIG. Therefore, the arrow X1 direction side in the figure is the cooling air upstream side, and the arrow X2 direction in the figure is the cooling air downstream side.

  The heat exchange device 24 has a configuration in which a radiator unit 24A, a fuel cooler 24B, a condenser 24C, and the like are integrated into a unit.

  The radiator unit 24 </ b> A is a radiator that cools cooling water flowing in the engine 20, an operating oil cooler that radiates operating oil from hydraulic equipment such as the various cylinders 12, 13, and 14, and a supercharge supplied to the engine 20. An intercooler for cooling the air is provided side by side. The fuel cooler 24B cools excess fuel that returns to a fuel tank (not shown). The capacitor 24 </ b> C is for generating cold air with an air conditioner mounted on the cab 8.

  Cooling water, hydraulic oil, supercharged air, surplus fuel, and the like flowing into the heat exchange device 24 are cooled by the cooling air 39. The engine 20 has a large number of drive parts such as pistons and crankshafts, and a lubrication device is provided so that these drive parts do not wear out (this will be described later).

  On the other hand, a hydraulic pump 27 is integrally attached to the X2 direction side of the engine 20. The hydraulic pump 27 is a hydraulic source such as the boom cylinder 12, the arm cylinder 13, and the bucket cylinder 14 that drive the work attachment 4. This hydraulic pump 27 is also driven by the engine 20.

  Exhaust gas discharged from the engine 20 is purified by the exhaust gas processing device 30. The exhaust gas discharged from the engine 20 may contain harmful substances such as nitrogen oxides (NOx), and an exhaust gas processing device 30 is connected to the engine 20 to purify them.

  The exhaust gas treatment device 30 includes a diesel particulate filter 31 (DPF) that collects particulate matter (PM) contained in exhaust gas, and a selective reducing agent (for example, reducing and removing nitrogen oxide (NOx)). , Urea or the like) and a selective reduction catalyst 32 (SCR) or the like that is reduced and removed.

  Further, the DPF 31 includes a front-stage oxidation catalyst on the upstream side, and the SCR 32 includes a rear-stage oxidation catalyst on the downstream side. The DPF 31 can be an oxidation catalyst-carrying filter (CSF).

  The exhaust gas treatment device 30 having the above-described configuration is supported by a house frame 35 having a frame body 36, a support 37, a firewall 42, and the like.

  Next, the lubrication apparatus will be described with reference to FIG.

  As described above, the lubrication device circulates engine oil in the engine 20 to lubricate the driving components disposed inside the engine. This lubricating device is constituted by an oil pan 38, an engine oil pump, an engine oil filter 40, an engine oil cooler 50, and the like.

  The oil pan 38 is disposed in the lower part of the engine 20. Engine oil is filled in the oil pan 38.

  The engine oil pump pumps the engine oil filled in the oil pan 38 to each drive component constituting the engine 20. Note that a strainer for removing dust may be provided at the engine oil suction port from the oil pan 38 of the engine oil pump.

  The engine oil filter 40 is an oil filter that filters engine oil, and removes abrasion powder and the like of driving parts mixed in the engine oil while circulating in the engine 20. Therefore, a filter member for removing abrasion powder and the like is provided inside the engine oil filter 40.

  Since the engine oil filter 40 is configured to remove the abrasion powder mixed in the engine oil in this way by filtering with a filter, it needs to be regularly maintained. For this reason, the engine oil filter 40 is provided in the vicinity of the maintenance door 19 provided on the exterior cover 18 and opened during maintenance.

  In general, the engine 20 and the maintenance door 19 are separated from each other. For this reason, the engine 20 and the engine oil filter 40 are connected using the engine oil pipe 41.

  Specifically, the engine 20 is provided with an oil outflow port 28 through which engine oil flows out toward the engine oil filter 40 and an oil inflow port 29 through which engine oil filtered by the engine oil filter 40 flows. ing. The engine oil pipe 41 is disposed between the ports 28 and 29 and the engine oil filter 40.

  By the way, the engine oil circulates in the engine 20 and lubricates the driving components, and is heated by the heat of the engine 20. If the engine oil is heated to a predetermined temperature or higher, it may not be possible to properly perform the lubrication function.

  The engine oil is cooled by cooling water that circulates in the engine 20 and is cooled by the radiator 24A. Therefore, when the engine oil is cooled below the predetermined temperature by the cooling water, the heat balance is achieved and good lubrication can be performed.

  However, as described above, when the temperature of the engine oil and the cooling water rises due to the driving state of the engine or the like, the engine oil is not sufficiently cooled, and this may reduce the heat balance.

  Therefore, in the present embodiment, the engine oil cooler 50 that cools the engine oil is disposed between the engine 20 and the engine oil filter 40 and in the middle of the flow path of the cooling air 39.

  As the engine oil cooler 50, a general air-cooled oil cooler including, for example, a tube, a core unit, and a pair of plate members can be used.

  The tube is configured to allow engine oil to flow inside, and has an inner fin. The core unit has a configuration in which a plurality of tubes are stacked and an outer fin is disposed between the stacked tubes. In addition, through holes for flowing engine oil between the stacked tubes are formed at both ends of each tube. Further, the pair of plate members are disposed so as to sandwich the core unit from above and below.

  The engine oil cooler 50 is cooled by the cooling air 39 generated by the cooling fan 23. By configuring the engine oil cooler 50 as described above, the contact area with the cooling air can be increased, and the cooling efficiency can be improved. it can.

  As described above, the arrangement position of the engine oil cooler 50 is set in the middle of the flow path of the cooling air 39. Therefore, when the engine oil flows through the engine oil cooler 50, the heat of the engine oil is radiated to the cooling air. As a result, the engine oil is cooled by the engine oil cooler 50.

  The engine oil cooler 50 configured as described above is disposed on the side of the engine 20 in the present embodiment. That is, the engine oil cooler 50 is disposed on the downstream side of the radiator 24 </ b> A with respect to the flow of the cooling air 39.

  It is conceivable that the engine oil cooler 50 is disposed on the upstream side of the radiator 24 </ b> A with respect to the flow of the cooling air 39 by being incorporated in the heat exchange device 24. Even with this configuration, the cooling air 39 flows into the engine oil cooler 50 and the engine oil can be cooled.

  However, the engine oil cooler 50 into which engine oil heated by the engine 20 flows is considered as a kind of heat source. Therefore, it is not desirable to arrange the engine oil cooler 50 serving as the heat source in front of the radiator 24A for cooling the cooling water from the viewpoint of maintaining the heat balance. Therefore, it is desirable that the engine oil cooler 50 is disposed on the downstream side of the radiator 24 </ b> A with respect to the flow of the cooling air 39.

  When the cooling air 39 flowing into the heat exchange device 24 (radiator 24A) is compared with the cooling air 39 that has passed through the heat exchange device 24, the temperature of the cooling air 39 that has passed through the heat exchange device 24 is higher. .

  However, the temperature of the engine oil flowing out from the oil outflow port 28 of the engine 20 is higher than the temperature of the cooling air 39 that has passed through the heat exchange device 24. For this reason, even with the cooling air 39 that has passed through the heat exchange device 24, the engine oil cooler 50 can sufficiently cool the engine oil.

  As described above, the engine oil cooler 50 is disposed outside the engine 20. Therefore, the engine oil cooler 50 is disposed in an engine oil pipe 41 that connects the engine 20 and the engine oil filter 40.

  The engine oil pipe 41 includes a first pipe 41A, a second pipe 41B, and a third pipe 41C.

  The first pipe 41 </ b> A connects the oil outflow port 28 provided in the engine 20 and the engine oil cooler 50. The second pipe 41 </ b> B connects the engine oil cooler 50 and the engine oil filter 40. Further, the third pipe 41 </ b> C connects the engine oil filter 40 and the oil inflow port 29.

  Therefore, the high temperature engine oil flowing out from the oil outflow port 28 of the engine 20 flows into the engine oil cooler 50 via the first pipe 41A, and the cooling process is performed. The engine oil cooled by the engine oil cooler 50 flows into the engine oil filter 40 through the engine oil pipe 41 and is filtered. The engine oil that has been filtered by the engine oil filter 40 flows again into the engine 20 via the third pipe 41C and the oil inflow port 29.

  As described above, in this embodiment, the engine oil is cooled by the cooling water in the engine 20 and is also cooled by the engine oil cooler 50. Therefore, it can prevent that the temperature of engine oil becomes more than the predetermined temperature which can perform an appropriate lubrication process, and can maintain heat balance appropriately.

  In addition, since the engine oil temperature is maintained at an appropriate temperature by providing the engine oil cooler 50, the temperature rise of the cooling water due to the increase in engine oil is also suppressed. Therefore, the heat balance can be properly maintained also by this.

  Next, another embodiment of the construction machine will be described with reference to FIG.

  In the present embodiment, the engine oil cooler 50 is provided with different positions, and FIG. 3 shows only a cross section of the engine chamber 17. In FIG. 3, the same reference numerals are given to the components corresponding to those shown in FIGS. 1 and 2, and the description thereof is omitted. Further, in FIG. 3, only the cooling air 39 that flows into the engine oil cooler 50 is shown.

  The engine oil filter 40 needs to be regularly maintained as described above. Therefore, the engine oil filter 40 is disposed in the vicinity of the maintenance door 19 that is opened during maintenance.

  On the other hand, the engine oil cooler 50 may also be maintained. The engine oil cooler 50 is provided in an engine oil pipe 41 that connects the engine 20 and the engine oil filter 40, and the arrangement position of the engine oil cooler 50 is relatively within the arrangement range of the engine oil pipe 41. It is possible to select freely. Further, the maintenance door 19 is generally disposed on the downstream side of the radiator 24 </ b> A with respect to the flow of the cooling air 39.

  Therefore, in this embodiment, the engine oil cooler 50 is disposed in the vicinity of the maintenance door 19 that is opened during maintenance. By adopting this configuration, it is possible to improve the maintainability of the engine oil cooler 50 while maintaining the heat balance.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific embodiments described above, and various modifications are possible within the scope of the gist of the present invention described in the claims. It can be modified and changed.

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Lower traveling body 3 Upper turning body 4 Attachment 5 Turning frame 6 Lower boom 8 Cab 15 Counterweight 16 Turning mechanism 17 Engine chamber 17a Engine hood 18 Exterior cover 19 Maintenance door 20 Engine 23 Cooling fan 24 Heat exchanger 24A Radiator 24B Fuel cooler 24C Condenser 27 Hydraulic pump 28 Oil outflow port 29 Oil inflow port 30 Exhaust gas treatment device 31 DOC
32 SCR
39 Cooling air 40 Engine oil filter 41 Engine oil piping 41A First piping 41B Second piping 41C Third piping 50 Engine oil cooler

Claims (3)

An engine having a cooling fan for generating cooling air;
A construction machine having an oil filter for filtering engine oil circulating in the engine,
A construction machine characterized in that an oil cooler for cooling the engine oil is provided in the middle of the flow path of engine oil between the engine and the oil filter and in the middle of the flow path of the cooling air.   The construction machine according to claim 1, wherein the oil cooler is disposed in the vicinity of a maintenance door that is opened during maintenance.   The construction machine according to claim 1 or 2, wherein the oil cooler is disposed downstream of a radiator cooled by the cooling fan with respect to the flow of the cooling air.

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