JP2019167775A - Construction machine - Google Patents

Abstract

To improve the air intake efficiency of an engine by supplying clean and cool air to an air cleaner.SOLUTION: An engine air intake chamber 21 is provided for a partition 7 so as to be positioned opposite to a counterweight 6 and next to an engine storage chamber 9. A left surface plate 14A of an external cover 14 is provided with a cool air inlet 14E that is positioned behind the position of the partition 7 and into which cool air for a heat exchanger 12 flows toward the engine storage chamber 9. The left surface plate 14A is provided with an outside air inlet 14F for engine that is positioned ahead of the position of the partition 7 and into which outside air for an engine 10 flows toward the engine air intake chamber 21. The partition 7 is provided with a suction opening 22 that opens to the engine air intake chamber 21 and that is connected to the suction side of an air cleaner 15. In addition, the partition 7 is provided with an air guiding plate 23 that guides outside air that flows from the outside air inlet 14F for engine from the engine air intake chamber 21 to the suction opening 22.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a construction machine such as a hydraulic excavator provided with an air cleaner for supplying clean outside air to an engine.

  In general, a hydraulic excavator as a typical example of a construction machine includes a lower traveling body capable of self-propelling and an upper revolving body provided on the upper side of the lower traveling body. The device is provided so as to be able to move up and down.

  The upper swing body includes a swing frame provided extending in the front, rear direction, left and right directions perpendicular to the front and rear directions with respect to the center of rotation, and a counterweight provided at a rear position of the swing frame, A partition plate provided on the swivel frame with a space on the front side of the counterweight and extending in the left and right directions of the swivel frame; an engine storage chamber formed between the counterweight and the partition plate; An engine installed in a horizontal position on the swivel frame located in the room, a heat exchanger located in the engine storage room on one side of the left and right sides of the engine, and cooling sucked from the outside Of the left and right side plates facing the heat exchanger, the suction type cooling fan that circulates the wind through the heat exchanger, the left and right side plates and the top plate that cover the engine compartment An air cleaner that is located between the side plate on one side and the heat exchanger and is disposed in the engine storage chamber and connected to the engine via an intake pipe (see, for example, Patent Document 1) ).

JP 2004-352036 A

  According to Patent Document 1, the air cleaner sucks air that has been heated by heat generated by the heat exchanger or the engine by disposing the air intake for cooling the engine and the outside air intake for intake of the air cleaner. I am trying not to. However, the heat generated by the heat exchanger and engine warms not only the surrounding air but also the entire air inside the exterior cover, and the air cleaner sucks this warmed air, reducing the intake efficiency of the engine. There's a problem.

  Therefore, in order to supply cold outside air to the air cleaner, it is conceivable to directly open the air cleaner intake port to the side plate of the exterior cover. However, with this configuration, there is a problem that the risk of sucking in foreign matter and rainwater together with the outside air increases.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a construction machine capable of improving the intake efficiency of an engine by supplying clean and cooled air to an air cleaner. There is.

  The present invention includes a self-propelled lower traveling body and an upper revolving body provided on the upper side of the lower traveling body so as to be able to swivel. , A swivel frame extending in the left and right directions orthogonal to the rear direction, a counterweight provided at a rear position of the swivel frame, and a space on the swivel frame on the front side of the counterweight. A partition plate extending upright in the left and right directions of the swing frame, an engine storage chamber formed between the counterweight and the partition plate, and the swing frame positioned in the engine storage chamber An engine installed horizontally, a heat exchanger located in one of the left and right directions with respect to the engine and disposed in the engine storage chamber, and cooling air sucked from outside A suction-type cooling fan that circulates in the heat exchanger, an outer cover having left and right side plates and an upper surface plate that covers the engine storage chamber, and the left and right side plates facing the heat exchanger. A construction comprising an air cleaner disposed between the side plate located on the one side and the heat exchanger and disposed in the engine storage chamber and connected to the engine via an intake pipe In the machine, an engine intake chamber that is positioned opposite to the counterweight with respect to the partition plate and adjacent to the engine storage chamber is provided, and the side plate on the one side that forms the exterior cover includes A cooling air inlet is provided on the rear side of the position of the partition plate and into which the cooling air for the heat exchanger flows toward the engine storage chamber, and is positioned on the front side of the position of the partition plate and For engine An engine external airflow inlet through which the outside air for the engine flows into the air chamber is provided, and the partition plate is provided with a suction port that opens to the engine air intake chamber and is connected to a suction side of the air cleaner. The partition plate is provided with an air guide plate that guides outside air that has flowed into the engine intake chamber from the engine outside airflow inlet toward the suction port.

  According to the present invention, clean and cool air can be supplied to the air cleaner, and the intake efficiency of the engine can be improved.

1 is a front view showing a hydraulic excavator according to an embodiment of the present invention. FIG. 2 is an enlarged plan view showing an upper swing body of the hydraulic excavator in FIG. 1 with a part of an exterior cover omitted. It is a perspective view of the principal part expansion which shows the left rear part of an upper turning body in the state which omitted the counterweight, the cab, and the exterior cover. It is sectional drawing which expanded and looked at the left rear part of the upper turning body from the arrow IV-IV direction in FIG. It is a perspective view shown in the state where a part of partition plate, a suction inlet, and an air guide plate were assembled. It is the disassembled perspective view which looked at the state which isolate | separated the baffle plate from a part of partition plate from the same position as FIG.

  Hereinafter, as a representative example of the construction machine according to the embodiment of the present invention, a rear super-swivel hydraulic excavator will be described as an example, and will be described in detail with reference to FIGS. In the present embodiment, with respect to the front and rear directions of the upper swing body, the horizontal directions orthogonal to the front and rear directions are the left and right directions, and the configuration, arrangement, and air flow direction of each device and member explain.

  1 and 2, a hydraulic excavator 1 as a construction machine includes a self-propelled crawler type lower traveling body 2 and an upper revolving body provided on the lower traveling body 2 so as to be pivotable about a pivot center O. 3 and a front device 4 provided at the front part of the upper swing body 3 so as to be capable of raising and lowering. The front device 4 performs excavation work of earth and sand.

  Here, the upper swing body 3 of the rear ultra-small swing excavator 1 is within a predetermined range with respect to the left and right width dimensions (full width) of the lower traveling body 2 with respect to the swing center O. It is comprised so that it may turn. Specifically, the predetermined range for the entire width of the lower traveling body 2 indicates a range within 130% of the entire width of the lower traveling body 2. The upper swing body 3 of the rear ultra-small swing excavator 1 is set so that the arc-shaped trajectory drawn by the rear surface of the counterweight 6 to be described later falls within the range of 130% of the full width described above.

  The turning frame 5 constitutes a support structure for the upper turning body 3. As shown in FIG. 2, the swivel frame 5 is erected on a flat bottom plate 5A made of a thick steel plate or the like extending forward and rearward (as a reference) with respect to the swivel center O, and the bottom plate 5A. The left vertical plate 5B, the right vertical plate 5C, the bottom plate 5A, and the vertical plates 5B, 5C extending leftward and rightward from the turning center O at predetermined intervals in the left and right directions. A plurality of overhanging beams 5D (only one is shown) provided with an interval in the front and rear directions and the vertical plates 5B and 5C extending in the front and rear directions with an interval in the left and right directions. It includes a left side frame 5E and a right side frame 5F attached to the distal end side of the beam 5D.

  A foot portion of the front device 4 is rotatably supported at front positions of the left vertical plate 5B and the right vertical plate 5C. On the other hand, counterweights 6 to be described later are attached to the rear positions of the left vertical plate 5B and the right vertical plate 5C.

  The counterweight 6 balances the weight with the front device 4, and is provided at the rear position of the turning frame 5. Here, the counterweight 6 is disposed at a position close to the turning center O of the upper swing body 3, and the rear surface of the counterweight 6 is formed in an arc shape centering on the swing center O of the upper swing body 3.

  The partition plate 7 has a space on the revolving frame 5 on the front side of the counterweight 6 and extends in the left and right directions of the revolving frame 5. Specifically, the partition plate 7 is formed as a front wall that is positioned between the left side plate 14A of the exterior cover 14 described later and the hydraulic oil tank 26 and covers the front side of the engine 10 and the heat exchanger 12 described later. Yes. Thereby, the partition plate 7 forms the engine storage chamber 9 in which the engine 10, the heat exchanger 12, etc. are arrange | positioned between the counterweights 6 below.

  Here, among the partition plates 7 extending in the left and right directions, the outside in the left and right directions from the heat exchanger 12, that is, the front side of the air cleaner 15 described later is the front side of the cooling air inflow chamber 9A of the engine housing chamber 9. The inflow chamber front blocking plate 7A is covered. As shown in FIGS. 3 to 6, the inlet chamber front blocking plate 7 </ b> A constituting the partition plate 7 is provided with a suction port 22, which will be described later, located in the upper blocking portion 7 </ b> A <b> 1 at the upper position. The inflow chamber front blocking plate 7A partitions the cooling air inflow chamber 9A and an engine intake chamber 21 described later.

  As shown in FIG. 4, the upper closing part 7A1 is provided with a duct connection part 7A2 so as to bulge toward the cooling air inflow chamber 9A. The duct connecting portion 7A2 bulges greatly on the left side plate 14A side so that the connecting portion of the duct 18 is inclined with respect to the upper closing portion 7A1. Thereby, the duct connection portion 7A2 can open the duct 18 at an obtuse angle with respect to the air flow flowing in from the engine external airflow inlet 14F of the left side plate 14A. With this configuration, air flowing in from the engine external airflow inlet 14 </ b> F can flow smoothly toward the duct 18.

  Further, an intake pipe insertion hole 7A3 is formed in the inflow chamber pre-occlusion plate 7A so as to be positioned below the upper closing part 7A1. An intake pipe 17 that connects the air cleaner 15 to the engine 10 is inserted through the intake pipe insertion hole 7A3.

  As shown in FIG. 2, the rear closing plate 8 is erected so as to extend in the left and right directions at the rear position of the revolving frame 5 so as to extend along the front surface of the counterweight 6. The rear closing plate 8 closes the rear side of the engine housing chamber 9 together with the front surface of the counterweight 6.

  The engine storage chamber 9 is formed between the counterweight 6 (rear closing plate 8) and the partition plate 7. The engine storage chamber 9 is covered with an exterior cover 14 described later on both the left and right sides and the upper side. Thereby, the engine storage chamber 9 is formed over the entire length of the upper swing body 3 in the left and right directions. The engine housing chamber 9 houses the engine 10, the hydraulic pump 11, the heat exchanger 12, and the air cleaner 15 therein.

  Of the engine storage chamber 9 that is elongated in the left and right directions with respect to the turning center O, the left side position that is one side in the left and right directions is upstream in the flow direction of the cooling air for the heat exchanger 12. The cooling air inflow chamber 9A is located on the side. The cooling air inflow chamber 9A is surrounded by the partition plate 7, the rear closing plate 8, the heat exchanger 12, and the left side plate 14A and the top plate 14C of the outer cover 14. External air flows into the cooling air inflow chamber 9A through a main inlet 14D and a cooling air inlet 14E provided on the left side plate 14A of the exterior cover 14.

  The engine 10 is located in the engine storage chamber 9 and is provided in a horizontally placed state extending leftward and rightward on the revolving frame 5. A suction-type cooling fan 13 which will be described later is provided at a left side position which is one side of the left and right direction of the engine 10, and a hydraulic pump 11 which will be described later is provided at a right side position which is the other side of the left and right direction. It has been.

  On the other hand, for example, an exhaust manifold 10A is provided on the front side of the engine 10, and a turbocharger 10B that forcibly sends air into each cylinder of the engine 10 using exhaust gas is provided in the exhaust manifold 10A. It has been. A later-described intake pipe 17 is connected to the air supply port of the supercharger 10B. Further, a water jacket (not shown) through which cooling water flows is provided inside the engine 10, and this cooling water is cooled by the radiator 12 </ b> B of the heat exchanger 12.

  The hydraulic pump 11 is provided on the right side of the engine 10. The hydraulic pump 11 is driven by the engine 10 to boost (pressurize) hydraulic oil supplied from a hydraulic oil tank 26 described later and supply the hydraulic oil to various actuators such as the front device 4. The hydraulic oil that has driven the various actuators is cooled by an oil cooler 12 </ b> C of the heat exchanger 12 described later, and then circulates in the hydraulic oil tank 26.

  The heat exchanger 12 is disposed in the engine storage chamber 9 so as to be located on the left side in the left and right directions with respect to the engine 10. The heat exchanger 12 is provided on the rear side of the revolving frame 5 so as to face a cooling fan 13 described later. The heat exchanger 12 cools various fluids whose temperature has risen with cooling air.

  Specifically, the heat exchanger 12 includes a rectangular frame 12A arranged in such a manner that the front and rear directions perpendicular to the flow direction of the cooling air are the horizontal width direction, and the frame 12A is arranged in parallel. The radiator 12B, the oil cooler 12C, and the intercooler 12D are arranged in the forward and rearward directions.

  Here, the radiator 12B cools the cooling water whose temperature has risen by cooling the engine 10. The oil cooler 12 </ b> C cools the hydraulic oil supplied to the various actuators of the excavator 1 and whose temperature has risen and returns it to the hydraulic oil tank 26. Further, the intercooler 12D cools the intake air whose temperature has been increased by the supercharger 10B of the engine 10 and supplies it to each cylinder of the engine 10.

  The cooling fan 13 is provided between the engine 10 and the heat exchanger 12, and is rotated by the engine 10, for example. This cooling fan 13 is arranged in a straight line with the engine 10 and the heat exchanger 12 in the left and right directions, and sucks the cooling air sucked from the outside of the exterior cover 14 described later to the heat exchanger 12. It is configured as. The cooling fan 13 can supply the cooling air to the heat exchanger 12 by sucking the cooling air from the outside. The cooling fan 13 may be separated from the engine 10 and rotated using an electric motor or a hydraulic motor.

  The exterior cover 14 is provided on the revolving frame 5 between the counterweight 6 and a cab 25 described later. The outer cover 14 covers equipment mounted on the revolving frame 5 including the engine 10, the hydraulic pump 11, and the heat exchanger 12. The exterior cover 14 includes a left side plate 14A, a right side plate 14B, and an upper plate 14C that cover the engine storage chamber 9.

  Specifically, the exterior cover 14 has a left side plate 14 </ b> A standing on the left side frame 5 </ b> E of the revolving frame 5 so as to cover the left side of the heat exchanger 12, and the right side so as to cover the right side of the hydraulic pump 11. A right side plate 14B erected on the frame 5F and an upper side plate 14C (which extends to the left and right directions over the upper portions of the side plates 14A and 14B and covers the upper side of the engine 10, the hydraulic pump 11 and the heat exchanger 12) (See FIG. 1).

  Here, a main inflow port 14D is provided in the left side plate 14A on the upstream side in the flow direction of the cooling air so as to be located in a wide range from the intermediate portion in the upper and lower directions to the lower portion. The main inflow port 14 </ b> D is for the cooling air for the heat exchanger 12 to flow mainly toward the engine storage chamber 9. A cooling air inlet 14E is provided at an upper position of the left side plate 14A above the main inlet 14D and positioned rearward of the partition plate 7. The cooling air inlet 14 </ b> E is a dedicated opening for the heat exchanger 12 through which the cooling air for the heat exchanger 12 flows into the engine storage chamber 9.

  On the other hand, an engine external air flow inlet 14F is provided at an upper position of the left side plate 14A and is located in front of the position of the partition plate 7. The engine external airflow inlet 14F is a dedicated opening through which air (outside air) for the engine 10 to inhale flows into an engine intake chamber 21 described later. Since the engine external airflow inlet 14F is arranged facing the air guide plate 23 described later in the left and right directions, the external air flowing in from the engine external airflow inlet 14F is actively directed toward the air guide plate 23. Is flowing.

  The air cleaner 15 faces the heat exchanger 12, and is disposed between the left side plate 14 </ b> A of the outer cover 14 and the heat exchanger 12 and is disposed in the engine storage chamber 9. That is, the air cleaner 15 is mounted on the mounting base 16 in the cooling air inflow chamber 9 </ b> A of the engine storage chamber 9. The mounting base 16 is provided, for example, extending in the front and rear directions across the inflow chamber front blocking plate 7A and the rear blocking plate 8 of the partition plate 7.

  The air cleaner 15 purifies the air that the engine 10 inhales, and is configured as a centrifugal air cleaner that removes foreign matters such as dust using centrifugal force. The air cleaner 15 cleans the air (outside air) sucked through a wind guide plate 23, a suction port 22, and a duct 18, which will be described later, and supplies the air to the supercharger 10B of the engine 10 through the intake pipe 17. The air cleaner 15 incorporates a filter element (not shown) in a cylindrical container extending in the front and rear directions, and an intake port 15A (see FIG. 4) is provided near the upper front side. The downstream side of the duct 18 is connected to the intake port 15A. On the other hand, the upstream side of the duct 18 is connected to the suction port 22 via a duct connection portion 7A2 provided on the front inflow chamber blocking plate 7A of the partition plate 7.

  Here, the air cleaner 15 opens the air guide plate 23 toward the engine outer airflow inlet 14F of the left side plate 14A, thereby sucking in cold air that has just flowed into the engine intake chamber 21 described later, The engine 10 can be supplied.

  The front closing plate 19 is erected on the revolving frame 5 so as to face the front side of the inflow chamber front closing plate 7A of the partition plate 7 with a gap. A rear closing plate 20 extending rearward toward the partition plate 7 is provided at the right end which is the inner portion of the front closing plate 19. As a result, a range surrounded by the partition plate 7, the left side plate 14 </ b> A of the exterior cover 14, the front closing plate 19 and the back closing plate 20 is an engine intake chamber 21 which will be described later.

  The engine intake chamber 21 is located on the front side opposite to the counterweight 6 with respect to the partition plate 7 and is provided adjacent to the engine storage chamber 9. The engine intake chamber 21 is provided separately from the engine storage chamber 9 at a position in front of the partition plate 7. The engine intake chamber 21 is surrounded by the partition plate 7, the left side plate 14 </ b> A of the exterior cover 14, the front closing plate 19 and the back closing plate 20. The engine intake chamber 21 is externally introduced through an engine external airflow inlet 14 </ b> F provided on the left side plate 14 </ b> A of the exterior cover 14. The engine intake chamber 21 is provided with a wind guide plate 23 described later.

  The suction port 22 is provided in the upper closing portion 7A1 that forms the inflow chamber front closing plate 7A of the partition plate 7. The suction port 22 is formed as, for example, a rectangular opening that is long in the left and right directions, and is connected to the duct connection portion 7A2. The suction port 22 is connected to the duct 18 on the suction side of the air cleaner 15 by opening into the engine intake chamber 21. The suction port 22 is covered with an air guide plate 23 on the engine 10 and heat exchanger 12 side (left, right side in the right direction) serving as a heat source.

  Next, the configuration and function of the air guide plate 23 that is a characteristic part of the present embodiment will be described in detail.

  The air guide plate 23 is provided on the partition plate 7 in order to guide the outside air flowing into the engine intake chamber 21 from the engine external air flow inlet 14F provided on the left side plate 14A of the exterior cover 14 toward the intake port 22. Yes. The air guide plate 23 is formed so that the surface facing the engine external airflow inlet 14 </ b> F, that is, the left surface opens into the engine intake chamber 21.

  Specifically, as shown in FIGS. 5 and 6, the air guide plate 23 has a rectangular side surface portion 23 </ b> A that faces the suction port 22 with a gap and is directed from the upper edge portion of the side surface portion 23 </ b> A toward the partition plate 7. And a triangular or trapezoidal upper surface portion 23B. Further, a deep bottom surface portion 23C is provided at the right edge portion of the side surface portion 23A so as to close the opening of the air guide plate 23 on the engine 10 side. The air guide plate 23 has an upper surface portion 23 </ b> B and a back bottom surface portion 23 </ b> C attached to the partition plate 7. The air guide plate 23 can also be formed integrally with the partition plate 7 by bending a part of the plate body forming the partition plate 7.

  The air guide plate 23 is provided so as to cover about half of the right side in which the engine 10 and the heat exchanger 12 serving as the heat source are arranged, out of the total length of the suction port 22 in the left and right directions. In this case, the upper surface portion 23B of the air guide plate 23 is fixed to the upper closing portion 7A1 of the inflow chamber front closing plate 7A with the rear edge portion on the partition plate 7 side positioned in the vicinity of the upper side of the suction port 22. ing. Further, the rear bottom surface portion 23C of the air guide plate 23 is fixed to the upper closing portion 7A1 with the rear edge portion positioned in the vicinity of the right side of the suction port 22. When the right end of the side surface portion 23A is fixed to the upper closing portion 7A1, the back bottom surface portion 23C can be omitted.

  As a result, the air guide plate 23 has an inflow opening 23 </ b> D on the left side facing the engine external airflow inlet 14 </ b> F provided on the left side plate 14 </ b> A of the exterior cover 14. Thereby, the air guide plate 23 can guide the outside air flowing into the engine intake chamber 21 from the engine outside air flow inlet 14F from the inflow opening 23D to the intake port 22.

  On the other hand, between the side surface portion 23A and the partition plate 7 (upper closing portion 7A1), a lower opening than the suction port 22 opens downward, thereby forming a discharge opening 23E. The discharge opening 23E is indicated by an arrow B when foreign matter or rainwater in the air is about to fall by its own weight when air flows in the direction of the arrow A toward the suction port 22 through the air guide plate 23. Thus, by permitting the fall, foreign matter and rainwater are prevented from entering the suction port 22.

  The lower side of the side surface portion 23 </ b> A of the air guide plate 23 extends beyond the suction port 22. The distance between the side surface portion 23A and the partition plate 7 is large at the left side position 23A1 close to the engine external air flow inlet 14F of the exterior cover 14. On the other hand, the distance between the side surface portion 23A and the partition plate 7 is small at the right position 23A2 away from the engine external airflow inlet 14F. Thus, the side surface portion 23A is formed as an inclined plate having a large opening on the engine external airflow inlet 14F side. In this way, by inclining the side surface portion 23A, as indicated by an arrow C in FIG. 4, the outside air that has flowed into the engine intake chamber 21 from the engine outside air flow inlet 14F passes through a large opening inflow opening 23D. By flowing into the air guide plate 23 and flowing along the inclined side surface portion 23A, the air guide plate 23 is smoothly guided toward the suction port 22.

  Further, the air guide plate 23 is provided at a position away from the engine external airflow inlet 14 </ b> F of the exterior cover 14. Therefore, a foreign matter exclusion space 24 is provided between the engine external airflow inlet 14 </ b> F and the air guide plate 23. When the air (outside air) flowing into the engine intake chamber 21 from the engine external airflow inlet 14F flows toward the suction port 22, the foreign object exclusion space 24 is configured to include foreign substances (dust, plant pieces, A space where rainwater can fall under its own weight is formed. Thereby, the foreign substance exclusion space part 24 can exclude foreign substances from the air flowing toward the suction port 22 from the engine external airflow inlet 14F.

  As shown in FIGS. 1 and 2, the cab 25 is provided on the left front side of the revolving frame 5. The cab 25 is to be boarded by an operator, and a driver's seat on which the operator is seated, an operation lever for traveling, an operation lever for work, and the like (all not shown) are arranged. The hydraulic oil tank 26 stores hydraulic oil and is provided on the revolving frame 5 so as to be positioned on the front side of the hydraulic pump 11. The fuel tank 27 stores fuel supplied to the engine 10 and is provided on the revolving frame 5 adjacent to the right side of the hydraulic oil tank 26.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  The operator of the excavator 1 gets on the cab 25 of the upper swing body 3, starts the engine 10, and drives the hydraulic pump 11. Thereby, pressure oil is discharged from the hydraulic pump 11, and this pressure oil is supplied to various hydraulic actuators via a control valve device (not shown).

  When an operator who has boarded the cab 25 operates an operation lever (not shown) for traveling, the vehicle can be moved forward or backward by the lower traveling body 2. On the other hand, when an operator in the cab 25 operates an operation lever (not shown) for work, the front device 4 can be moved up and down to perform excavation work of earth and sand.

  The exterior cover 14 is provided with a left side plate 14A located on the left side in the left and right directions with respect to the turning center O. The left side plate 14A is provided with a main inlet 14D and a cooling air inlet 14E. . Therefore, when the hydraulic excavator 1 is operating, the cooling fan 13 sucks outside air into the cooling air inflow chamber 9A of the engine housing chamber 9 through the main inlet 14D and the cooling air inlet 14E, and enters the heat exchanger 12 as cooling air. Supply. Thereby, in the heat exchanger 12, engine cooling water and hydraulic fluid can be cooled.

  On the other hand, air (outside air) that flows into the engine intake chamber 21 from the engine external airflow inlet 14F of the exterior cover 14 flows into the air cleaner 15 through the suction port 22 and the duct 18, and foreign matter is removed by the air cleaner 15. To be cleaned. The purified air is supplied to the engine 10 through the intake pipe 17.

  Thus, according to the present embodiment, the engine housing chamber 9 (cooling air inflow chamber 9A) is located on the front side opposite to the counterweight 6 with respect to the partition plate 7, that is, on the front side of the partition plate 7. ) Is provided adjacent to the engine intake chamber 21. The left side plate 14A of the exterior cover 14 is provided with a cooling air inlet 14E that is located behind the position of the partition plate 7 and into which the cooling air for the heat exchanger 12 flows toward the engine storage chamber 9, An engine external airflow inlet 14 </ b> F is provided which is located in front of the position of the partition plate 7 and into which the external air for the engine 10 flows toward the engine intake chamber 21. Further, the partition plate 7 is provided with a suction port 22 that opens into the engine intake chamber 21 and is connected to the suction side of the air cleaner 15. In addition, the partition plate 7 is provided with an air guide plate 23 that guides the outside air that has flowed into the engine intake chamber 21 from the engine outside air flow inlet 14 </ b> F toward the suction port 22.

  Therefore, the air guide plate 23 can guide the outside air flowing into the engine intake chamber 21 from the engine external airflow inlet 14 </ b> F of the exterior cover 14 to the suction port 22. Thereby, even if ambient air rises in temperature by the engine 10 or the heat exchanger 12, the air guide plate 23 can guide only the cooled outside air flowing from the engine outside air flow inlet 14F to the suction port 22. . As a result, cold air can be supplied to the air cleaner 15 and the intake efficiency of the engine can be improved.

  The air guide plate 23 is formed so that the surface facing the engine external airflow inlet 14 </ b> F opens into the engine intake chamber 21. Thereby, the outside air that has flowed into the engine intake chamber 21 from the engine outside airflow inlet 14F can be actively guided to the wind guide plate 23 by the inflow opening 23D that opens to the engine airflow inlet 14F side.

  The air guide plate 23 is provided at a position separated from the engine external airflow inlet 14F. Therefore, a foreign matter exclusion space 24 is provided between the engine external airflow inlet 14F and the air guide plate 23 to exclude foreign matters flowing from the engine external airflow inlet 14F. Thereby, in the foreign material exclusion space part 24, the foreign material contained in the air can be allowed to fall by its own weight. Thereby, the foreign substance exclusion space part 24 can exclude foreign substances from the air flowing toward the suction port 22 from the engine external airflow inlet 14F. As a result, clean air can be supplied to the air cleaner 15 and the cleaning operation of the air cleaner 15 can be simplified.

  The air guide plate 23 has a side surface portion 23A that faces the suction port 22 with a space, and an upper surface portion 23B that extends from the upper portion of the side surface portion 23A toward the partition plate 7 and is attached to the partition plate 7. Between the side surface portion 23 </ b> A and the partition plate 7, a lower side than the suction port 22 serves as a discharge opening 23 </ b> E and opens downward. Thereby, when the air flows through the air guide plate 23 toward the suction port 22, the discharge opening 23 </ b> E can drop foreign matter and rainwater in the air by its own weight, and the foreign matter enters the suction port 22. Can be prevented.

  Further, the distance between the side surface portion 23A of the air guide plate 23 and the partition plate 7 increases at a position close to the engine external airflow inlet 14F, and the distance between the side plate 23A and the partition plate 7 at a position away from the engine external airflow inlet 14F. It is formed as an inclined plate with a small distance dimension. Accordingly, the side surface portion 23A is formed as an inclined plate having a large opening on the engine external airflow inlet 14F side. As a result, the outside air that has flowed into the engine intake chamber 21 from the engine external airflow inlet 14F can flow into the air guide plate 23 through the large inflow opening 23D, and the suction port 22 along the inclined side surface portion 23A. Can be distributed smoothly.

  In the embodiment, the case where the side surface portion 23A of the air guide plate 23 is formed as a flat inclined plate has been described as an example. However, the present invention is not limited to this, and for example, the side surface portion may be formed as an arcuate curved surface. Moreover, you may form a side part as a plate body parallel to a partition plate.

  In the embodiment, the case where the discharge opening 23E is formed by opening the lower side below the suction port 22 between the side surface portion 23A and the partition plate 7 is illustrated. However, the present invention is not limited to this, and a configuration may be adopted in which a lower surface portion is provided between the lower portion of the side surface portion 23 </ b> A and the partition plate 7 to close it.

  In the embodiment, the crawler hydraulic excavator 1 of the rear super-swirl type is described as an example of the construction machine. However, the present invention is not limited to this, and for example, the micro-swivel hydraulic excavator and the wheel-type hydraulic excavator are used. It can be widely applied to other construction machines such as excavators, hydraulic cranes, wheel loaders and the like.

1 Excavator (construction machine)
DESCRIPTION OF SYMBOLS 2 Lower traveling body 3 Upper revolving body 5 Revolving frame 6 Counterweight 7 Partition plate 9 Engine storage chamber 10 Engine 12 Heat exchanger 13 Cooling fan 14 Exterior cover 14A Left side plate (one side plate)
14B Right side plate 14C Top plate 14E Cooling air inlet 14F Engine external airflow inlet 15 Air cleaner 17 Intake pipe 21 Engine intake chamber 22 Suction port 23 Air guide plate 23A Side surface portion 23B Upper surface portion 23D Inflow opening 23E Exhaust opening 24 Foreign matter exclusion space portion O Turning center

Claims (5)

A self-propelled lower traveling body, and an upper revolving body provided on the upper side of the lower traveling body so as to be pivotable,
The upper swing body is
A swivel frame provided to extend to the front, rear and front, left and right directions orthogonal to the swivel center,
A counterweight provided at a rear position of the swivel frame;
A partition plate provided on the swivel frame with a space on the front side of the counterweight and extending in the left and right directions of the swivel frame;
An engine storage chamber formed between the counterweight and the partition plate;
An engine positioned in the engine housing chamber and installed horizontally on the revolving frame;
A heat exchanger located in one side of the left and right directions with respect to the engine and disposed in the engine storage chamber;
A suction-type cooling fan that circulates cooling air sucked from outside through the heat exchanger;
An exterior cover having left and right side plates and a top plate covering the engine storage chamber;
The engine is disposed between the heat exchanger and the one side plate located on the one side of the left and right side plates facing the heat exchanger and disposed in the engine storage chamber. In a construction machine having an air cleaner connected to an air pipe via an intake pipe,
An engine intake chamber that is located opposite to the counterweight with respect to the partition plate and is adjacent to the engine storage chamber is provided,
The side plate on one side forming the exterior cover is provided with a cooling air inlet that is located rearward of the partition plate and into which the cooling air for the heat exchanger flows toward the engine storage chamber. And an outside air inlet for the engine through which the outside air for the engine flows into the intake chamber for the engine located in front of the position of the partition plate is provided,
The partition plate is provided with a suction port that opens into the engine intake chamber and is connected to a suction side of the air cleaner,
The construction machine according to claim 1, wherein the partition plate is provided with an air guide plate that guides the outside air that has flowed into the engine intake chamber from the engine outside air flow inlet toward the suction port.   2. The construction machine according to claim 1, wherein the air guide plate is formed such that a surface facing the external air flow inlet for the engine is open to the intake chamber for the engine. The air guide plate is provided at a position separated from the engine external airflow inlet,
2. A foreign matter exclusion space for removing foreign matter flowing from the engine external airflow inlet is provided between the engine external airflow inlet and the wind guide plate. The construction machine described. The air guide plate has a side surface facing the suction port with an interval, and an upper surface portion extending from the upper portion of the side surface toward the partition plate and attached to the partition plate.
2. The construction machine according to claim 1, wherein a lower side of the suction port is opened downward between the side surface portion and the partition plate.   The side surface portion of the air guide plate has a large distance dimension with the partition plate at a position close to the engine external airflow inlet, and a distance dimension with the partition plate at a position away from the engine external airflow inlet. The construction machine according to claim 4, wherein the construction machine is formed as an inclined plate that decreases the height of the construction machine.

Images