JP6285840B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine such as a hydraulic excavator provided with a vent for circulating air through an engine cover, for example.

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

  The upper revolving structure includes a revolving frame having a support structure and a work device attached to the front side, a counterweight provided on the rear side of the revolving frame, and a front side of the counterweight on the revolving frame. An engine provided in a horizontal state extending in the left and right directions, a hydraulic pump provided on the right side in the longitudinal direction of the engine, and provided on the turning frame located on the left side in the longitudinal direction of the engine And a building cover comprising a left and right side plate and a top plate arranged at the upper end of each side plate and having an opening for performing maintenance on the mounted equipment including the engine, and the building And an engine cover that closes the opening of the cover.

  The engine cover is provided with a vent for discharging cooling air used for cooling by the heat exchange device or for releasing heat generated by the engine or the like to the outside. In this case, the engine cover is provided with a cover member that partially covers the vent hole in order to prevent the intrusion of rainwater and dust from the outside while ensuring air permeability (for example, Patent Document 1). reference).

JP 2014-80828 A

  However, according to the above-described prior art, a configuration is shown in which rainwater is guided and captured at the opening on the upper surface of the engine cover. For example, when parked on an inclined land, the rainwater is discharged to the outside of the engine cover. May not be enough.

  An object of the present invention is to be configured so that drainage of rainwater is promoted to the outside of the engine cover even when rainwater or the like enters the engine cover opening regardless of the parking state on an inclined land or the like.

Construction machine according to the invention, the front-side working device is attached to, the vehicle body frame without a support structure, a counterweight disposed on a rear side of the body frame, wherein the located on the front side of the counterweight An engine provided in a horizontally placed state extending left and right on a vehicle body frame, a hydraulic pump provided on one side of the length direction of the engine, and the vehicle body positioned on the other side of the length direction of the engine A building cover comprising a heat exchange device provided on a frame, and a left and right side plate and an upper plate arranged at the upper end of each side plate and having an opening for performing maintenance on a mounted device including the engine When sucks outside air, and a cooling fan for supplying to the heat exchanger as cooling air, the upper end of the peripheral surface plate and peripheral surface plate surrounding the opening to close the opening of the housing cover Comprising an engine cover made top plate provided on the location.

In order to solve the above-described problems, a feature of the configuration adopted by the present invention is that the peripheral surface plate of the engine cover is provided with an inclined surface portion inclined inward from below to above, and the peripheral surface plate The inclined surface portion is provided with a plurality of openings arranged in the upward and downward directions, and the plurality of openings are provided at positions facing the ventilation holes on the inner surface of the inclined surface portion. Surrounded by a rainwater / dust discharge box, the rainwater / dust discharge box is disposed facing the upper positions of the plurality of openings, and the cooling air is supplied from the inside of the engine cover to the outside. The rainwater / dust discharge box is provided with an internal vent for discharging , and the rainwater / dust discharge box faces the lower position of the plurality of openings and receives rainwater / dust that has entered the rainwater / dust discharge box from the vent. In the lower position Discharge guide surface for guiding to discharge from the opening to the outside is that provided that.

  According to the present invention, rainwater can be discharged to the outside of the engine cover even when rainwater or the like enters the engine cover opening regardless of the parking state on an inclined land or the like.

1 is a front view showing a hydraulic excavator according to a first embodiment of the present invention. It is an enlarged plan view showing a hydraulic excavator in a state where a part of the working device is omitted. It is the expanded sectional view which looked at the rear side of the upper revolving body from the arrow III-III direction in FIG. It is the perspective view which looked at the outer side cover of the cover member for post-processing apparatuses which comprises an engine cover from upper direction. It is the perspective view which looked at the outer side cover of FIG. 4 from the downward direction. It is a perspective view which expands and shows a rainwater / dust discharge box with the vent of a virtual line. It is sectional drawing which expands and shows the (VII) part in FIG. It is the perspective view which looked at the vent hole and rainwater / dust discharge box by 2nd Embodiment from the same position as FIG. 5 with the outer cover. It is a perspective view which shows the rainwater / dust discharge box by the 1st modification. It is a perspective view which shows the rainwater / dust discharge box by the 2nd modification. It is sectional drawing which looked at the outer side cover provided with the vent hole by the 3rd modification from the same position as FIG.

  Hereinafter, as a typical example of a construction machine according to an embodiment of the present invention, a crawler type hydraulic excavator will be described as an example, and will be described in detail with reference to the accompanying drawings.

  First, FIG. 1 to FIG. 7 show a first embodiment of the present invention. 1 and 2, a hydraulic excavator 1 constitutes a crawler type construction machine. The hydraulic excavator 1 is a self-propelled lower traveling body 2, is mounted on the lower traveling body 2 so as to be able to turn, and an upper revolving body 3 that constitutes a vehicle body together with the lower traveling body 2, and the upper revolving body 3 It is provided on the front side so as to be able to move up and down, and includes a working device 4 that performs soil excavation work and the like.

  The turning frame 5 constitutes a vehicle body frame that becomes a part of the upper turning body 3 and is formed as a support structure. As shown in FIG. 3, the swivel frame 5 is provided with a bottom plate 5A made of a thick steel plate or the like extending in the front and rear directions, and standing on the bottom plate 5A, with a predetermined interval at a position near the center in the left and right directions. A left vertical plate 5B and a right vertical plate 5C that extend in the front and rear directions, and a plurality of extended beams 5D that extend outward from the bottom plate 5A and the vertical plates 5B and 5C in the left and right directions. A left side frame 5E, a right side frame 5F, which extends forward and rearward with a space to the left and right of the vertical plates 5B and 5C, and is attached to the distal end of each overhang beam 5D, and the bottom plate 5A, For example, it includes four engine brackets 5G provided on the rear side of the right vertical plate 5C, and a plurality of undercovers 5H provided between the bottom plate 5A and the side frames 5E and 5F. As shown in FIG. 2, the working device 4 is attached to the front side of the left and right vertical plates 5B and 5C so as to be able to move up and down.

  The cab 6 is mounted on the left front side of the revolving frame 5, and the cab 6 is formed as a box body extending upward and downward. The cab 6 is carried 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 disposed.

  The counterweight 7 is provided on the rear side of the turning frame 5. The counterweight 7 is for weight balance with the work device 4 and is formed as a heavy object having a circular arc on the rear surface side.

  As shown in FIG. 3, the engine 8 is mounted on the turning frame 5 so as to be positioned on the front side of the counterweight 7. The engine 8 is provided in a horizontal state extending in the left and right directions, and a cooling fan 8A for sucking cooling air from the outside is provided on the left side thereof. Further, the engine 8 has an exhaust pipe 8B for discharging exhaust gas connected to an exhaust gas aftertreatment device 11 described later. The engine 8 is attached to each engine bracket 5G of the revolving frame 5 via a vibration isolation mount 8C.

  The cooling fan 8A is rotationally driven by using the engine 8 as a power source, thereby sucking outside air from an intake port 16A of the left side door 16 described later into the machine room 15 and using the outside air as cooling air to be described later. To supply. The cooling fan can be provided separately from the engine and can be driven to rotate by an electric motor or the like.

  The hydraulic pump 9 is provided on one side in the length direction of the engine 8, that is, on the right side of the engine 8. The hydraulic pump 9 discharges pressure oil (operating oil) for operating each hydraulic actuator provided in the lower traveling body 2, the working device 4, and the like.

  The heat exchange device 10 is located on the other side of the engine 8 in the longitudinal direction, that is, on the left side of the engine 8, and is provided on the revolving frame 5 so as to face the cooling fan 8 </ b> A. The heat exchanging device 10 is configured, for example, by arranging a radiator, an oil cooler, and the like in parallel to the flow direction of the cooling air, that is, arranged side by side in front and rear of the swivel frame 5. The heat exchanging device 10 cools fluids such as engine cooling water and hydraulic oil by outside air (cooling air) taken in by the cooling fan 8A.

  Here, as described above, the heat exchanging device 10 has the radiator, the oil cooler, and the like arranged in parallel to the flow direction of the cooling air. It is long in the direction.

  The exhaust gas aftertreatment device 11 is provided above the hydraulic pump 9 on the right side of the engine 8. The exhaust gas aftertreatment device 11 removes harmful substances in the exhaust gas discharged from the engine 8 and reduces the noise of the exhaust gas. The exhaust gas aftertreatment device 11 is located on the engine 8 side and extends in the front and rear directions of the revolving frame 5 and has a cylindrical container-like first cylindrical case 11A, and on the downstream side of the first cylindrical case 11A. A connecting pipe 11B extending in substantially parallel to the cylindrical case 11A while being communicated, and a cylinder arranged adjacent to the lower right position of the first cylindrical case 11A, the upstream side being connected to the connecting pipe 11B The container-shaped second cylindrical case 11C and a processing apparatus main body (not shown) provided in each of the cases 11A, 11C and the like are configured.

  The upstream side of the first cylindrical case 11 </ b> A is connected to the exhaust pipe 8 </ b> B of the engine 8. On the other hand, an outlet pipe 11D is provided on the downstream side of the second cylindrical case 11C so as to protrude upward. The outlet pipe 11D is connected to a tail pipe 26 provided on an outer cover 23 of a post-processing apparatus cover member 21 described later.

  Here, the processing apparatus main body provided in each case 11A, 11C, etc. will be described. As this processing apparatus main body, an oxidation catalyst or the like is used to collect and remove particulate matter (PM) contained in the exhaust gas. Known are particulate matter removal devices composed of filters, NOx purification devices that purify nitrogen oxides (NOx) contained in exhaust gas using an aqueous urea solution, and silencers (exhaust mufflers) that reduce exhaust gas noise. It has been. These processing apparatus main bodies can be used alone or in combination.

  The hydraulic oil tank 12 is positioned on the front side of the hydraulic pump 9 and provided on the turning frame 5 (see FIG. 2). The hydraulic oil tank 12 stores hydraulic oil supplied to a hydraulic actuator mounted on the hydraulic excavator 1. The fuel tank 13 stores fuel to be supplied to the engine 8, and is provided on the revolving frame 5 so as to be positioned on the front side of the hydraulic oil tank 12.

  The building cover 14 is provided between the cab 6 and the counterweight 7 and is provided on the revolving frame 5. The building cover 14 covers mounted devices such as the engine 8, the hydraulic pump 9, the heat exchange device 10, and the exhaust gas aftertreatment device 11, and forms a machine room 15 that accommodates the mounted devices. . The building cover 14 includes a left side door 16, a right side door 17, a top plate 18 and the like which will be described later.

  The left side door 16 forms a left side plate and is erected on the left side frame 5E of the revolving frame 5 so as to extend forward from the left edge position of the counterweight 7. The left side door 16 faces the heat exchanging device 10 and can open and close the front side with the rear end portion as a rotation fulcrum, for example. On the upper side of the left side door 16, there is provided an air inlet 16 </ b> A composed of a plurality of slits for communicating the inside of the machine room 15 with the outside. The intake port 16 </ b> A is for sucking air (outside air) for cooling the heat exchange device 10.

  The right side door 17 forms a right side plate, and is erected on the right side frame 5F of the revolving frame 5 so as to extend from the right end edge position of the counterweight 7 to the front side. As with the left side door 16, the right side door 17 can open and close the front side with the rear end as a pivot.

  The top plate 18 is disposed at the upper ends of the left and right side doors 16 and 17 and is formed as a flat plate elongated in the left and right directions. The top plate 18 has an opening 18 </ b> A (see FIG. 3) for performing maintenance on the mounted equipment including the engine 8. Here, the upper surface plate 18 is formed, for example, by connecting a plurality of plate materials in the left and right directions. Further, on the left side of the top plate 18, another intake port 18 </ b> B is provided in the vicinity of the intake port 16 </ b> A of the left side door 16.

  Next, the configuration of the engine cover 19 which is a characteristic part of the present invention will be described in detail with reference to FIGS.

  The engine cover 19 according to the first embodiment is provided to close the opening 18 </ b> A of the upper surface plate 18 constituting the building cover 14. The engine cover 19 is composed of an engine cover member 20 that covers the engine 8, the heat exchange device 10, and the like, and an aftertreatment device cover member 21 that covers the exhaust gas aftertreatment device 11. In addition, the engine cover 19 can also be comprised by one member, without dividing | segmenting into an engine cover member and a cover member for post-processing apparatuses.

  As shown in FIG. 2, the engine cover member 20 includes a front peripheral surface plate 20A that surrounds the opening 18A of the upper surface plate 18 from the front side, a rear peripheral surface plate 20B that surrounds the opening 18A from the rear side, and the opening. The left peripheral plate 20C that surrounds the portion 18A from the left side and the top plate 20D provided at the upper end position of each of the peripheral plates 20A to 20C are configured in a flat box shape with the right side and the lower side open.

  The top plate 20D is provided with a plurality of, for example, two, for example, two exhaust ports 20E for discharging the cooling air that has passed through the heat exchange device 10 and has risen in temperature to the outside. In the engine cover member 20, for example, the lower part of the rear peripheral surface plate 20 </ b> B located on the counterweight 7 side is attached to the upper surface plate 18 of the building cover 14 as a rotation fulcrum. Thereby, the front side of the engine cover member 20 can be opened and closed. The engine cover member 20 may be divided into a plurality of parts in the left and right directions in consideration of workability, operability during opening and closing, maintainability, and the like.

  The aftertreatment device cover member 21 covers the upper portion of the exhaust gas aftertreatment device 11 and is disposed adjacent to the right side of the engine cover member 20. Here, the aftertreatment device cover member 21 covers the exhaust gas aftertreatment device 11 disposed at a position higher than the engine 8, and is thus formed to protrude upward from the engine cover member 20. .

  The aftertreatment device cover member 21 is disposed on the engine cover member 20 side (in the left and right directions), and includes an inner cover 22 that covers the first cylindrical case 11A of the exhaust gas aftertreatment device 11; The inner cover 22 is configured to include an outer cover 23 that is positioned on the left and right outer sides (right side) of the inner cover 22 and covers the second cylindrical case 11C.

  As shown in FIGS. 2 and 3, the inner cover 22 is formed as a box-like body that is long in the front and rear directions. Specifically, the inner cover 22 is disposed so as to be continuous with the front peripheral surface plate 20A of the engine cover member 20, and includes a front peripheral surface plate 22A surrounding the front side of the opening 18A of the upper surface plate 18, and an engine cover member. The rear peripheral surface plate 22B is arranged so as to be continuous with the rear peripheral surface plate 20B and surrounds the rear side of the opening 18A, and the rising edge is formed so as to rise from the right end of the top surface plate 20D of the engine cover member 20. The plate 22C is constituted by the peripheral plates 20A and 20B and the top plate 22D provided at the upper end position of the rising plate 22C.

  The top plate 22D is provided with a plurality of exhaust ports 22E for discharging the cooling air whose temperature has risen to the outside, for example, two in the front and rear directions. And the inner side cover 22 is attached with respect to the upper surface board 18 of the building cover 14 so that opening and closing is possible or detachable.

  Next, the configuration of the outer cover 23 of the post-processing apparatus cover member 21 will be described. The outer cover 23 constitutes a part of the engine cover 19 and includes a vent 24 and a rainwater / dust discharge box 25 described later.

  The outer cover 23 is formed as a box-like body that is long in the front and rear directions facing the inner cover 22 in the left and right directions. Specifically, the outer cover 23 is arranged to be continuous with the front peripheral surface plate 22 </ b> A of the inner cover 22 and surrounds the front peripheral surface plate 23 </ b> A surrounding the front side of the opening 18 </ b> A of the upper surface plate 18. A rear peripheral plate 23B that is arranged so as to be continuous with the face plate 22B and surrounds the rear side of the opening 18A, a right peripheral plate 23C that surrounds the opening 18A from the right side, and upper ends of the peripheral plates 23A to 23C It is comprised by the top plate 23D provided in the position.

  As shown in FIGS. 4 and 5, among the front peripheral surface plate 23 </ b> A of the outer cover 23, the upper and lower portions from the middle portion to the upper portion are inclined surface portions 23 </ b> A <b> 1 inclined inward (rearward) from the bottom to the top. It has become. Further, in the right peripheral surface plate 23C, the upper portion from the middle portion in the upper and lower directions is an inclined surface portion 23C1 that is inclined inward (leftward) from the lower portion to the upper portion. The inclined surface portions 23A1 and 23C1 are provided with a vent 24 and a rainwater / dust discharge box 25 which will be described later.

  Here, the inclined surface portion 23A1 provided on the front peripheral surface plate 23A and the inclined surface portion 23C1 provided on the right peripheral surface plate 23C will be described. The inclined surface portions 23A1 and 23C1 have a function of reducing the size of the engine cover 19 and widening the rear view of the operator riding on the cab 6 by inclining the upper portions of the front peripheral surface plate 23A and the right peripheral surface plate 23C inward. doing.

  In the right peripheral surface plate 23C, a plurality of, for example, five exhaust ports 23E are provided continuously from the middle portion in the upper and lower directions to the lower portion in the front and rear directions. On the other hand, the top plate 23D is provided with an attachment opening 23F for attaching a tail tube 26 to be described later. Furthermore, a rainwater / dust discharge box 25 described later is integrally attached to the inner side surfaces 23A2 and 23C2 of the inclined surface portions 23A1 and 23C1. The outer cover 23 is attached to the upper surface plate 18 of the building cover 14 so that the outer cover 23 can be opened and closed or detached.

  Next, the structure of each vent 24 provided in the outer cover 23 and the rainwater / dust discharge box 25 will be described.

  For example, the vent 24 is provided at one place on the inclined face portion 23A1 of the front peripheral face plate 23A provided on the outer cover 23 of the cover member 21 for the post-processing device constituting the engine cover 19, and at two places on the inclined face portion 23C1 of the right peripheral face plate 23C. Are provided in a total of three locations. Since the three vent holes 24 have the same basic shape (structure), in this embodiment, the vent holes 24 arranged on the front side of the inclined surface portion 23C1 of the right peripheral surface plate 23C are representatively described. It shall be.

  The vent hole 24 is formed by a plurality of, for example, three openings 24A, 24B, 24C arranged in the upward and downward directions. Here, the three openings 24A, 24B, 24C are formed as horizontally long openings in the left and right directions (horizontal direction), and the three horizontally long openings 24A, 24B, 24C are directed upward and downward. The ventilation holes 24 are formed by arranging in multiple stages. That is, the vent 24 is formed by the upper opening 24A, the middle opening 24B, and the lower opening 24C.

  The upper and lower clearance dimensions of the openings 24A, 24B, 24C are dimensions that allow sufficient circulation of air, hot air, etc. while preventing intrusion of flying stones or the like that damage the rainwater / dust discharge box 25 described below, for example. Is set to

  As shown in FIG. 5, the rainwater / dust discharge box 25 is provided so as to surround the three openings 24 </ b> A to 24 </ b> C at a position facing the vent 24 on the inner surface 23 </ b> C <b> 2 of the inclined surface portion 23 </ b> C <b> 1 of the right peripheral surface plate 23 </ b> C. ing. The rainwater / dust discharge box 25 allows air, hot air, etc. to circulate between the machine room 15 and the outside of the engine cover 19 and prevents rainwater and dust from entering the machine room 15. is there.

  As shown in FIGS. 6 and 7, the rainwater / dust discharge box 25 is attached to the inner side surface 23C2 of the inclined surface portion 23C1 of the right peripheral surface plate 23C, and is positioned vertically above and extending vertically. A rectangular vertical surface 25A, a rectangular discharge guide surface 25B extending obliquely downward from the lower end of the vertical surface 25A toward the inclined surface portion 23C1, and the vertical surface 25A and the discharge guide surface 25B are provided therebetween. The triangular side surface 25C is formed as a box body having a mountain-shaped internal space.

  Although the vertical surface 25A has been described as extending vertically in the upward and downward directions, the vertical in the present embodiment represents a shape extending in the upward and downward directions. That is, the vertical surface 25A has only to have a shape (angle) that makes it difficult for falling rainwater or dust to enter the internal vent 25D described later, that is, slightly inclined toward the vent 24 from the upper side to the lower side. It includes a shape or a shape slightly inclined to the side opposite to the vent hole 24.

  The rainwater / dust discharge box 25 is disposed so as to surround each of the openings 24A to 24C of the vent 24 with respect to the inner surface 23C2 of the inclined surface portion 23C1 of the right peripheral surface plate 23C. Used to be fixed integrally with the outer cover 23. The rainwater / dust discharge box 25 fixed in this manner has a vertical surface 25A facing the upper opening 24A located at the upper part of the three openings 24A to 24C. On the other hand, the discharge guide surface 25B is inclined downward from the lower end of the vertical surface 25A toward the lower opening 24C located at the lower portion.

  Here, an internal vent 25D having a large rectangular opening is formed on the vertical surface 25A facing the upper opening 24A. The internal vent 25D allows air to flow between the inside (machine room 15) of the engine cover 19 and the outside. Further, the vertical surface 25A is provided with a porous steel plate 25E (generally called punching metal) as a mesh member at a position covering the internal vent 25D. The perforated steel plate 25E is fixed to the vertical surface 25A by welding means or the like. Thereby, the porous steel plate 25E can regulate the intrusion of earth and sand from the internal vent 25D.

  In the rainwater / dust discharge box 25 configured in this way, as indicated by the dotted arrows in FIG. 7, cooling air, engine 8, exhaust gas aftertreatment device 11, etc. are generated by cooling each part. Hot air or the like can be discharged to the outside through the internal vent 25D (porous steel plate 25E), the upper opening 24A of the vent 24, and the like.

  On the other hand, as shown by solid line arrows in FIG. 7, rainwater and dust enter from the openings 24 </ b> A to 24 </ b> C of the vent 24. In this case, since rainwater and dust fall from the upper side toward the lower side, they do not reach the internal vent 25D provided on the vertical surface 25A and fall on the discharge guide surface 25B. Rainwater and dust that have fallen on the discharge guide surface 25B are guided toward the lower opening 24C along the inclination of the discharge guide surface 25B, and are discharged to the outside from the lower opening 24C.

  The outer cover 23 has a tail pipe 26 attached to an attachment opening 23F formed in the top plate 23D. The tail pipe 26 is connected to the outlet pipe 11D of the exhaust gas aftertreatment device 11 when the outer cover 23 is closed (or attached to the top plate 18 of the building cover 14).

  The hydraulic excavator 1 according to the first embodiment has the above-described configuration. Next, the operation of the hydraulic excavator 1 will be described.

  First, the operator gets on the cab 6 and sits on the driver's seat. By operating the traveling lever in this state, the lower traveling body 2 can be driven to move the excavator 1 to the work site. The operator seated in the driver's seat can operate the working device 4 and the like to perform excavation work of soil and the like by operating the working lever.

  When the hydraulic excavator 1 is in operation, the cooling fan 8A is rotationally driven by the engine 8, and external air flows into the machine chamber 15 from the intake port 16A of the left side door 16 and the other intake port 18B of the top plate 18. To do. The inflowing outside air is supplied to the heat exchange device 10 as cooling air, and cools fluid such as engine cooling water and hydraulic oil. On the other hand, the cooling air whose temperature has risen after passing through the heat exchange device 10 has an exhaust port 20E provided in the engine cover member 20, an exhaust port 22E provided in the inner cover 22 of the post-processing device cover member 21, and an outer side. It is discharged to the outside through an exhaust port 23E provided in the cover 23.

  At this time, as shown in FIG. 7, a part of the cooling air whose temperature has risen and a part of the hot air generated by the exhaust gas aftertreatment device 11 are the internal vent 25D of each rainwater / dust discharge box 25, the outer cover. The air can be discharged to the outside through the respective vent holes 24 provided in 23.

  On the other hand, at the work site of the hydraulic excavator 1, it is raining and dust is flying. When these rainwater and dust enter the engine cover 19 through the vents 24, not only the inside of the machine room 15 is soiled but also the engine 8, the exhaust gas aftertreatment device 11 and the like may be defective.

  However, according to the first embodiment, the front peripheral surface plate 23A of the outer cover 23 constituting the cover member 21 for the aftertreatment device of the engine cover 19 is inclined inward (rearward) from below to above. The inclined surface portion 23A1 is provided, and the right peripheral surface plate 23C is provided with the inclined surface portion 23C1 inclined inwardly (leftward) from below to above. In addition, the inclined surface portions 23A1 and 23C1 of the peripheral plates 23A and 23C are provided with vent holes 24 each having a plurality of openings 24A to 24C arranged in the upward and downward directions. Further, the rain water / dust discharge box 25 is provided so as to surround the three openings 24A to 24C at positions facing the vent holes 24 on the inner side surfaces 23A2 and 23C2 of the inclined surface portions 23A1 and 23C1.

  The rainwater / dust discharge box 25 is provided with an internal vent 25D that faces the upper position of the opening, for example, the upper opening 24A and allows air to flow between the inside of the engine cover 19 (machine room 15) and the outside. Yes. Further, the rainwater / dust discharge box 25 faces the lower position of the opening, for example, the lower opening 24C, and drains rainwater and dust that has entered the rainwater / dust discharge box 25 from the vent 24 to the outside through the lower opening 24C. Thus, a discharge guide surface 25B for guiding is provided.

  Accordingly, the cooling air used for cooling the engine 8 and the like and the hot air generated by the engine 8 and the exhaust gas aftertreatment device 11 and the like are caused to flow out of the engine cover 19 through the internal vent 25D of the rainwater / dust discharge box 25. Can do. Moreover, since rainwater and dust that has entered from the upper opening 24A and the like forming the vent 24 fall downward, it is difficult for rainwater and dust to enter the internal vent 25D disposed at the upper position. Yes. Further, rainwater or dust that has entered the rainwater / dust discharge box 25 falls onto the discharge guide surface 25B at the lower position and is discharged to the outside through the lower opening 24C by being guided by the discharge guide surface 25B. Can do.

  As a result, when the hydraulic excavator 1 is parked on an inclined ground or the like and rainwater or dust enters the vent 24 of the engine cover 19, the rainwater / dust discharge box 25 does not collect rainwater or dust on the outside of the engine cover 19. Can be discharged.

  Moreover, the rainwater / dust discharge box 25 having the above-described function is integrated with the inner side surfaces 23A2 and 23C2 of the outer cover 23 constituting the post-processing device cover member 21 of the engine cover 19 by using welding means. Can be installed on. As a result, when the engine cover 19 is assembled to the building cover 14, the engine cover 19 to which the rainwater / dust discharge box 25 is attached in advance can be assembled. Thereby, the number of parts regarding assembly can be reduced and assembly workability can be improved.

  The rainwater / dust discharge box 25 includes a vertical surface 25A that is located on the upper side and provided with an internal vent 25D, and a discharge guide surface 25B that is inclined downward from the lower end of the vertical surface 25A toward the lower opening 24C. It is configured. Accordingly, since the internal vent 25D located at the upper part of the rainwater / dust discharge box 25 is provided on the vertical surface 25A, rainwater and dust falling from above can hardly enter the internal vent 25D. it can. Furthermore, the rainwater / dust discharge box 25 can be easily manufactured, for example, by bending a plate to form a vertical surface 25A and a discharge guide surface 25B and providing each side surface 25C thereto.

  On the other hand, the rainwater / dust discharge box 25 is provided with a porous steel plate 25E as a mesh member at a position covering the internal vent 25D. Thereby, even if earth and sand enter from each opening 24A-24C of vent 24, invasion of earth and sand from internal vent 25D can be controlled by perforated steel plate 25E, and the inside of engine cover 19 (machine room 15) can be controlled. Can be kept clean.

  The openings 24A to 24C of the vent hole 24 are formed as horizontally long openings in the left and right directions, and the horizontally long openings 24A to 24C are arranged in multiple stages in the upward and downward directions. Accordingly, each of the openings 24A to 24C forming the vent hole 24 can prevent intrusion of pebbles and the like while ensuring an opening area for ventilation.

  Further, in the configuration in which the exhaust gas aftertreatment device 11 for treating the exhaust gas discharged from the engine 8 is provided above the hydraulic pump 9, the outer cover 23 constituting the aftertreatment device cover member 21 of the engine cover 19. The vents 24 provided in the inclined surface portions 23A1 and 23C1 of the peripheral surface plates 23A and 23C can discharge heat generated by the exhaust gas aftertreatment device 11 to the outside.

  Next, FIG. 8 shows a second embodiment of the present invention. A feature of the present embodiment is that a single rainwater / dust discharge box is provided over both the front peripheral surface plate and the right peripheral surface plate with respect to the corner positions of the front peripheral surface plate and the right peripheral surface plate of the outer cover. It is to have done. In the second embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  In FIG. 8, the vent 31 according to the second embodiment is provided on the inner surface 23A2 of the inclined surface portion 23A1 of the front peripheral surface plate 23A, and the vent 32 is formed on the inner surface 23C2 of the inclined surface portion 23C1 of the right peripheral surface plate 23C. It is provided at the front position. The vents 31 and 32 have three openings 31A to 31C and 32A to 32C in substantially the same manner as the vent 24 according to the first embodiment. However, in the vents 31 and 32 according to the second embodiment, the openings 31A to 31C and 32A to 32C are formed longer than the respective openings 24A to 24C of the vent 24 according to the first embodiment. Is different.

  The rainwater / dust discharge box 33 according to the second embodiment is bent in an L shape so as to conform to the shape of the corner, and has a size surrounding the two vent holes 31 and 32. Have. That is, the rainwater / dust discharge box 33 is bent from the first vertical surface 33A, the first discharge guide surface 33B, the first vertical surface 33A, and the first discharge guide surface 33B facing the vent 31. The second vertical surface 33C, the first discharge guide surface 33D, and the side surface provided at the left end of the first vertical surface 33A and the first discharge guide surface 33B that extend rearward and face the vent hole 32. 33E, and a second vertical surface 33C and a side surface 33F provided at the rear end of the second discharge guide surface 33D. Further, a porous steel plate 33G is attached to the first vertical surface 33A so as to cover the internal vent (not shown), and the second vertical surface 33C is covered to the internal vent (not shown). A perforated steel plate 33H is attached.

  Thus, also in the second embodiment configured as described above, substantially the same operations and effects as those of the first embodiment described above can be obtained. In particular, in the second embodiment, it is only necessary to attach one rainwater / dust discharge box 33 to the two vent holes 31, 32, so that the assembly workability can be further improved.

  In the first embodiment, the vertical surface 25A of the rainwater / dust discharge box 25 is provided with a porous steel plate 25E (punching metal) as a mesh member at a position covering the internal vent 25D. Explained. However, the present invention is not limited to this. For example, the present invention may be configured as a first modification shown in FIG. That is, the rainwater / dust discharge box 41 according to the first modification is formed of a vertical surface 41A, a discharge guide surface 41B, and a side surface 41C, and a large number of slits 41D are formed on the vertical surface 41A. The slit 41D may be used as a mesh member. In this case, a circular hole may be formed instead of the slit.

  For example, you may comprise like the 2nd modification shown in FIG. That is, the rainwater / dust discharge box 51 according to the second modification is formed of a vertical surface 51A, a discharge guide surface 51B, a side surface 51C, and an internal vent (not shown), and the vertical vent 51A covers the internal vent. By attaching the wire mesh member 51D as described above, the wire mesh member 51D may be used as a mesh member. These configurations can be similarly applied to the second embodiment.

  In 1st Embodiment, the case where the vent hole 24 is formed of three opening 24A-24C is illustrated. However, the present invention is not limited to this. For example, the present invention may be configured as a third modified example shown in FIG. In other words, the vent 61 according to the third modified example has a configuration in which slit-like openings 61A are arranged in four or more stages in the upward and downward directions (in this third modified example, eight (eight) are illustrated). Also good. This configuration can be similarly applied to the second embodiment.

  Furthermore, in each embodiment, the crawler type hydraulic excavator 1 was described as an example of the construction machine. However, the present invention is not limited to this, and may be applied to, for example, a hydraulic excavator provided with a wheel-type lower traveling body. Furthermore, it can be widely applied to other construction machines equipped with an engine such as a hydraulic crane.

1 Excavator (construction machine)
4 Working device 5 Turning frame (body frame)
7 Counterweight 8 Engine 9 Hydraulic pump 10 Heat exchanger 14 Building cover 16 Left side door (left side plate)
17 Right side door (right side plate)
18 Upper surface plate 18A Opening 19 Engine cover 20 Engine cover member 20A, 22A, 23A Front peripheral surface plate 20B, 22B, 23B Rear peripheral surface plate 20C Left peripheral surface plate 20D, 22D, 23D Top surface plate 21 Post processing device cover member 22 Inside Cover 23 Outer cover 23A1, 23C1 Inclined surface portion 23A2, 23C2 Inner side surface 23C Right peripheral plate 24, 31, 61 Ventilation holes 24A-24C, 31A-31C, 32A-32C, 61A Openings 25, 33, 41, 51 Rainwater / dust discharge Box 25A, 41A, 51A Vertical surface 25B, 41B, 51B Discharge guide surface 25D Internal vent 25E, 33G, 33H Perforated steel sheet (network member)
33A First vertical surface 33B First discharge guide surface 33C Second vertical surface 33D Second discharge guide surface 41D Slit (net-like member)
51D Wire mesh member (net-like member)

Claims (5)

Working device is mounted on the front side, and the body frame that forms a support structure,
A counterweight provided on the rear side of the vehicle body frame;
An engine that is positioned in front of the counterweight and that extends horizontally on the vehicle body frame in the left and right directions;
A hydraulic pump provided on one side in the longitudinal direction of the engine;
A heat exchange device provided on the vehicle body frame and located on the other side in the longitudinal direction of the engine;
A building cover comprising left and right side plates and a top plate having an opening for performing maintenance on the mounted equipment including the engine, which is arranged at the upper end of each side plate;
A cooling fan that sucks outside air and supplies it to the heat exchange device as cooling air;
In a construction machine comprising a peripheral plate surrounding the opening to close the opening of the building cover and an engine cover including a top plate provided at the upper end position of the peripheral plate,
The peripheral surface plate of the engine cover is provided with an inclined surface portion inclined inward from the lower side to the upper side,
The inclined surface portion of the peripheral surface plate is provided with a ventilation port composed of a plurality of openings arranged in the upward and downward directions,
A rainwater / dust discharge box is provided surrounding the plurality of openings at a position facing the vent on the inner surface of the inclined surface portion,
The rainwater / dust discharge box is disposed so as to face the upper positions of the plurality of openings , and is provided with an internal vent for discharging the cooling air from the inside of the engine cover to the outside , and
The rainwater / dust discharge box faces the lower position of the plurality of openings and discharges rainwater and dust that has entered the rainwater / dust discharge box from the vent to the outside through the opening at the lower position. A construction machine characterized in that a discharge guide surface for guiding is provided. The rainwater / dust discharge box includes a vertical surface provided on the upper side and provided with the internal vent, and the discharge guide surface inclined downward from the lower end of the vertical surface toward the opening at the lower position. construction machine according to claim 1 it, characterized in that is provided. Wherein the rainwater, dust discharge box, the inner vent covers position mesh member is provided to, claim 1 you, characterized in that to regulate the entry of sediment from the inner vent by net-like member Or the construction machine of 2. Each opening of the vent is formed as a horizontally long opening extending in the left and right directions,
The vents on the Horizontal opening, the construction machine according to claim 1, 2 or 3 characterized in that it is formed by being arranged in multiple stages in the downward direction. Above the hydraulic pump, an exhaust gas aftertreatment device for treating exhaust gas exhausted from the engine,
The engine cover is construction machine according to claim 1, 2, 3 or 4 you, characterized in that it Tsu covering the said engine exhaust gas after-treatment device.

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