Work machine

Abstract

To provide a work machine allowing discharged air from an engine room to be efficiently guided upward outside of a machine body from a vent hole.SOLUTION: A discharged air duct 80 arranged between a radiator 61 mounted on an engine room 11 and a right cover 14 in which a vent hole is formed is configured to include an upper plate part 81, a front side plate part 82, and a lower plate part 83 so as to make an outer shape of the radiator 61 form a generally cylindrical frame extending toward the right cover 14, and is provided with a partition plate 91 separating a discharging passage for air in a duct vertically to a lower first passage 93 and an upper second passage 94.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a work machine having a ventilation hole in an exterior cover. [Background technology]

[0002] Conventionally, some working machines, such as excavators, are configured with a lower traveling body having a pair of left and right crawler-type traveling parts, an upper rotating body rotatably connected to the lower traveling body, and a working device provided on the rotating frame of the upper rotating body so as to be movable up and down. The rotating frame of the upper rotating body is provided with a driver's seat and a driving section where an operator operates the working device, etc., and an engine room in which various devices including an engine are arranged, and the engine room is covered with an exterior cover.

[0003] Furthermore, in such a work machine, in order to cool the engine, etc., an exterior cover is provided with an air vent, and the air within the engine room is discharged to the outside.

[0004] For example, Patent Document 1 proposes a work machine in which a cooling fan is placed between the engine and a heat exchanger (radiator) in the engine room, and an exhaust duct is formed between the radiator and an air vent provided in an exterior cover facing the radiator. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2004-352089 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the work machine disclosed in Patent Document 1, in an air vent configured by fitting a grill into an opening of an exterior cover, plate-shaped fins arranged in parallel with the top and bottom of the grill in the front-rear direction are arranged diagonally so that the outside of the machine body is upward. That is, by adjusting the inclination angle of the plate-shaped fins of the grill, air containing heat that passes through the radiator by the operation of the cooling fan is discharged diagonally upward from the air vent. However, simply changing the inclination angle of the grill fins was not able to efficiently guide the exhaust air upward. For this reason, for example, during excavation work on the side of the road, the exhaust air containing heat discharged from the air vent is blown onto low roadside trees and / or flowers in flowerbeds that are at the same height as or lower than the exhaust port, causing a problem that these plants may wither due to the heat.

[0007] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a working machine that is capable of efficiently directing exhaust air from the engine room to the upper outside of the machine body through an air vent. [Means for solving the problem]

[0008] The working machine according to the present invention is a working machine in which an exterior cover is provided with an air vent that communicates with an engine room, and an air exhaust flow path is formed between a heat exchanger arranged in a position opposite the air vent and the exterior cover in which the air vent is provided, and a partition plate that separates the exhaust flow path into upper and lower parts is arranged at an incline upward from the inside of the engine room toward the air vent.

[0009] In a working machine according to another aspect of the present invention, the partition plate separates the exhaust flow path into a first flow path below the partition plate and having a flow path cross-sectional area that widens from the inside of the engine room toward the vent, and a second flow path above the partition plate and having a flow path cross-sectional area that narrows from the inside of the engine room toward the vent.

[0010] A work machine according to another aspect of the present invention is the work machine, wherein a flow path cross-sectional area of ​​the second flow path on the heat exchanger side is larger than a flow path cross-sectional area of ​​the first flow path on the heat exchanger side.

[0011] A work machine according to another aspect of the present invention is the work machine, wherein the second flow path is configured so that the flow of air is faster than the flow of air discharged from the first flow path.

[0012] A work machine according to another aspect of the present invention is a work machine in which the first flow path is configured so that a flow of air discharged from the first flow path is formed toward the flow of air discharged from the second flow path.

[0013] A work machine according to another aspect of the present invention is the work machine described above, wherein a lower surface portion forming a lower surface of the first flow path is disposed below the partition plate and inclined upward toward the ventilation opening.

[0014] A work machine according to another aspect of the present invention is the work machine described above, wherein the partition plate is provided so that the inclination angle thereof is changeable.

[0015] A working machine according to another aspect of the present invention is a working machine in which the partition plate is pivotally mounted to a support member forming a side wall of the discharge flow path and has a fixing portion that fixes the inclination of the partition plate relative to the support member. Effect of the Invention

[0016] According to the present invention, in a configuration in which an exterior cover is provided with a vent hole, it is possible to efficiently guide the exhaust air discharged from the vent hole to the upper outside of the aircraft body. [Brief description of the drawings]

[0017] [Figure 1] 1 is a left side view of an excavation machine according to an embodiment of the present invention. FIG. [Diagram 2] 1 is a right side view of an upper rotating body of an excavation machine according to an embodiment of the present invention. FIG. [Diagram 3] 1 is a schematic plan view showing an arrangement of equipment within an upper rotating body of an excavation work machine according to an embodiment of the present invention. FIG. [Figure 4] 4 is a partial perspective view showing the configuration of an exhaust duct and its surroundings disposed inside the exterior cover of the excavation machine according to one embodiment of the present invention. FIG. [Diagram 5] FIG. 2 is an exploded perspective view of an exhaust duct of an excavation machine according to an embodiment of the present invention. [Figure 6] FIG. 4 is a schematic cross-sectional view showing exhaust air through an exhaust duct of the excavation machine according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] The present invention relates to a configuration in which an exterior cover is provided with a vent hole, and by devising an exhaust duct configuration, air is efficiently guided from the vent hole to the upper outside of the aircraft body. Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0019] In the embodiment of the present invention, an excavating machine (shovel) which is a slewing work vehicle will be described as an example of the working machine according to the present invention. However, the working machine according to the present invention is not limited to excavating machines, and can be widely applied to other working machines such as bulldozers, crane working machines, compact track loaders, skid steer loaders, wheel loaders, etc.

[0020] The configuration of the excavation machine 1 according to this embodiment will be described with reference to the drawings. In the following, unless a particular viewing direction is specified, the following will be referred to as the "front side," "rear side," "left and right sides," "flat side," "upper side," "bottom side," or "lower side" based on the position of an operator seated in the driver's seat of the excavation machine 1.

[0021] Fig. 1 is a left side view of an excavation work machine 1 according to the present invention. Fig. 2 is a right side view of an upper rotating body 20B. Note that in Fig. 2, the excavation device 3 and the driving section 10 are omitted.

[0022] As shown in Fig. 1, the excavation work machine 1 comprises a self-propelled traveling body (machine body) 2, and an excavation device 3 and an earth removal device 4 as work machines attached to the traveling body 2. The traveling body 2 comprises a lower traveling body 20A equipped with a traveling section 5, and an upper rotating body 20B rotatably provided on the upper part of the lower traveling body 20A. The earth removal device 4 is attached to the lower traveling body 20A side. The excavation device 3 is attached to the upper rotating body 20B side.

[0023] The lower traveling body 20A has a pair of left and right crawler-type traveling parts 5,5 and a machine frame 6 interposed between the left and right traveling parts 5,5 as a base.

[0024] The traveling unit 5 has a configuration in which a crawler belt is wound around a sprocket, an idler, and a plurality of rollers supported by the machine frame 6. The traveling unit 5 has a drive sprocket 5a, which is a drive wheel, at its rear end.

[0025] The soil discharge device 4 is attached to the front side of the machine frame 6. The soil discharge device 4 is provided so as to be vertically rotatable with respect to the lower traveling body 20A. The soil discharge device 4 includes a pair of left and right arms 4b and a blade 4a, which is a blade, provided at the tip of the pair of left and right arms 4b.

[0026] The left and right arms 4b are provided between the left and right running portions 5, 5, extending in the front-rear direction. The left and right arms 4b have their base ends supported by arm support brackets (not shown) provided at the front of the machine frame 6, with the left and right direction being the rotation axis direction. The left and right arms 4b rotate up and down by the expansion and contraction of a blade cylinder (not shown). In other words, the expansion and contraction of the blade cylinder causes the blade 4a to rotate up and down via the left and right arms 4b.

[0027] The upper rotating body 20B has a rotating frame 7 mounted so as to be rotatable with respect to the traveling part 5. The rotating frame 7 is connected to the machine body frame 6 via a rotating bearing 6a, and is provided so as to be rotatable in either the left or right direction around a rotating axis whose axial direction is in the up-down direction with respect to the machine body frame 6 by driving a rotating motor (not shown).

[0028] The revolving frame 7 has a generally circular shape in a plan view, and serves as a base for the upper revolving body 20B. A support bracket 41 is provided on the front side of a base plate 7a (see FIG. 3) of the revolving frame 7. A base end of the support bracket 41 is fixed to the base plate 7a by welding or the like. The support bracket 41 supports a swing bracket 42 that supports the excavation device 3 so that it can rotate freely in the front-rear direction.

[0029] The excavation device 3 has a boom 21 that constitutes its base side portion, an arm 22 connected to the tip side of the boom 21, and a bucket 23 attached to the tip of the arm 22. The excavation device 3 also has a boom cylinder 26 that rotates the boom 21, an arm cylinder 27 that rotates the arm 22, and a bucket cylinder 28 that rotates the bucket 23.

[0030] The base end of the boom 21 is supported by a swing bracket 42. The swing bracket 42 is supported by a support bracket 41 so as to be swingable in the left-right direction. More specifically, the swing bracket 42 is supported by the support bracket 41 protruding from the revolving frame 7 via a connecting shaft whose rotation axis is in the up-down direction.

[0031] The swing bracket 42 rotatably supports the base end of the boom 21 with the left-right direction as the rotation axis direction, and also supports the lower end of the boom cylinder 26. The swing bracket 42 is also provided with a portion for connecting the tip of the rod of a swing cylinder (not shown). Therefore, the operation of the swing cylinder causes the swing bracket 42 to rotate about the connecting shaft, causing the excavation device 3 to swing left-right.

[0032] The boom cylinder 26, arm cylinder 27, bucket cylinder 28 and swing cylinder are all double-acting hydraulic cylinders that are operated by pressure oil discharged from a hydraulic pump (not shown). Hydraulic pipes for hydraulic supply and hydraulic discharge are connected to each hydraulic cylinder. In addition, in the excavation device 3, the bucket 23 is detachably attached as a work attachment, and other attachments such as a clamping machine (fork) or a crusher (breaker) are attached in place of the bucket 23 depending on the work content.

[0033] The rotating frame 7 is provided with a driving section 10 where an operator drives and operates the traveling section 5 and the work equipment, and an engine room 11 that houses an engine 12, a battery 54, a fuel tank 51 for the engine, and a hydraulic oil tank 52 for the hydraulic cylinders (see FIG. 3). The engine room 11 is provided on the rotating frame 7 from the right side of the driving section 10 to the rear.

[0034] The revolving frame 7 has an exterior cover that forms the outer shape of the upper revolving body 20B. The exterior cover is a member that surrounds the devices arranged on the base plate 7a of the revolving frame 7 to form the engine room 11. The exterior cover is composed of a plurality of members of different shapes and sizes according to the shape of the revolving frame 7 and the arrangement of the components of the revolving frame 7. That is, the exterior cover is composed of a rear cover 13 that is above the counterweight 9 and covers the rear of the engine room 11, a right cover 14 that covers the right side of the engine room 11 on the right side of the revolving frame 7, a lower right cover 15 that covers the lower right side of the engine room 11, a right front cover 16 that covers the front right side of the engine room 11, and a left rear cover 19 that covers the rear left side of the engine room 11.

[0035] The right cover 14 is provided with a plurality of vents that communicate the engine room 11, which is a space surrounded by the exterior cover, with the outside. By operating a cooling fan 65 (see FIG. 3) provided in the engine room 11, high-temperature air in the engine room 11 is exhausted through the plurality of vents.

[0036] The counterweight 9 is for balancing the weight with the excavation equipment 3. The counterweight 9 is attached to, for example, a stay (not shown) erected on the base plate 7a of the revolving frame 7 so as to cover the rear of the engine room 11 below the rear cover 13.

[0037] The driving section 10 is used to drive and operate the traveling body 2 and the excavation device 3, and has a flat floor 8. The floor 8 is provided on the left part of the front half on the rotating frame 7, and the left side of the rotating frame 7 is the boarding entrance for the operator. A canopy 30 is provided for the driving section 10. The canopy 30 has a pair of left and right support sections 31, 31 erected above the engine room 11 behind the driving section 10, and a canopy roof section 32 supported by the pair of left and right support sections 31, 31. The canopy roof section 32 covers the driving section 10 from directly above.

[0038] In the driver's unit 10, a driver's seat support base 34 is provided on the rear side of the floor 8, and a driver's seat 35 is provided on the driver's seat support base 34. A pair of left and right travel levers 36 are provided in front of the driver's seat 35, extending upward from the floor 8. A plurality of operation pedals 37 for work are arranged on both the left and right sides of the travel levers 36 on the floor 8. In the driver's unit 10, an operation panel unit is provided around the driver's seat 35, which has various operation units such as work operation levers and switches for operating work machines such as the excavator 3.

[0039] In the excavator 1 having the above-mentioned configuration, the desired motion and work are performed by an operator seated in the driver's seat 35 appropriately operating the travel lever 36 and / or the work operation lever, etc. For example, operation of the travel lever 36 causes the traveling section 5 to travel forward and backward in a straight line or to turn left and right, and operation of the work operation lever causes the excavation device 3 to perform excavation work, or the soil removal device 4 to perform soil removal and / or ground leveling work.

[0040] The configuration relating to cooling of the engine 12 and the hydraulic oil in the engine room 11 in the excavator 1 according to this embodiment will be further described.

[0041] Fig. 3 is a schematic plan view showing the arrangement of the equipment in the upper rotating body 20B. In Fig. 3, the left part of the upper rotating body 20B is cut away to show the arrangement of the equipment in the engine room 11 from the right side to the rear on the rotating frame 7.

[0042] The engine room 11 is formed as a space with the base plate 7a of the revolving frame 7 as the floor, the right side covered by a right cover 14, and the rear covered by a rear cover 13 and a counterweight 9. A fuel tank 51, a hydraulic oil tank 52, a battery 54, and a heat exchange unit 60 are arranged on the right side of the revolving frame 7 in the engine room 11. The engine 12 is arranged rearward of the center of the revolving frame 7. The engine 12 is, for example, a diesel engine.

[0043] The right cover 14 has an arc shape in plan view that follows the outer shape of the revolving frame 7. In a side view, the right cover 14 has a substantially rectangular shape with the long sides in the front-rear direction, and two openings 72a, 72b are provided at the top and bottom that penetrate the right cover 14. Each opening 72a, 72b is provided with an inclination such that the front side of the long side is slightly lowered. Each opening 72a, 72b is fitted with a grill 74 made of a lattice-shaped frame that allows air to flow while preventing foreign objects such as sand and stones from passing through. In addition, a plurality of slits 73 that penetrate the right cover 14 are formed above the upper opening 72a and below the lower opening 72b. The two openings 72a, 72b to which the grill 74 is attached and the plurality of slits 73 function as vents that communicate the inside and outside of the upper revolving body 20B.

[0044] The heat exchange unit 60 includes a radiator 61 and an oil cooler 62 .

[0045] The radiator 61 has a rectangular plate shape. The radiator 61 is a heat exchanger for cooling engine coolant, and includes a flow passage through which the coolant flows and a heat dissipation portion (fins).

[0046] The oil cooler 62 has a rectangular plate shape smaller than the radiator 61, and is disposed to the left (inside) of the radiator 61 so that it overlaps with approximately half of the surface area of ​​the radiator 61. The oil cooler 62 is a heat exchanger for cooling the hydraulic oil that operates the hydraulic cylinders and the like, and includes a flow passage through which the hydraulic oil flows and a heat dissipation section. The oil cooler 62 cools the hydraulic oil returning to the hydraulic oil tank 52 by dissipating heat of the return oil from each hydraulic cylinder in the heat dissipation section.

[0047] The cooling fan 65 is disposed facing the heat exchange unit 60. The cooling fan 65 is, for example, an axial flow fan having a plurality of blades attached to a cylindrical hub 65a. A fan shroud 68 is provided around the cooling fan 65. The fan shroud 68 is formed in a box shape so as to surround the outer periphery of the cooling fan 65.

[0048] The cooling fan 65 is configured to operate in conjunction with the driving of the engine 12 by connecting a boss portion provided in the center of the hub 65a to the output shaft of the engine 12. That is, the cooling fan 65 starts rotating when the engine 12 starts, and stops rotating when the engine 12 stops. In other words, while the engine 12 is running, the cooling fan 65 rotates and is configured to exhaust air inside the engine room 11 to the outside through each vent hole formed in the right cover 14.

[0049] In the engine room 11, the engine 12, the cooling fan 65, the fan shroud 68, the oil cooler 62, and the radiator 61 are arranged in this order from the inside toward the right cover 14. That is, the radiator 61 constituting the heat exchange unit 60 is arranged to face the right cover 14. Note that the arrangement of the oil cooler 62 and the radiator 61 may be reversed.

[0050] Between the radiator 61 and the right cover 14, there is provided an exhaust duct 80 that forms an exhaust flow path through which the exhaust air blown out through the fins of the radiator 61 by the operation of the cooling fan 65 reaches the openings 72a and 72b. Note that in the present embodiment, the right cover 14 is provided with the openings 72a and 72b formed substantially at the top and bottom, but the shape of the openings that serve as the vents is not limited thereto. For example, a single opening larger than the openings 72a and 72b may be provided.

[0051] The exhaust duct 80 will be further described with reference to Fig. 4 to Fig. 6. Fig. 4 shows an enlarged view of the exhaust duct 80 with the right cover 14 removed. Fig. 5 shows the arrangement of the partition plate 91 attached to the exhaust duct 80 with a two-dot chain line, and the partition plate 91 removed from the exhaust duct 80 with a solid line, and an enlarged view of part A of the partition plate 91 in the removed state surrounded by a dashed line circle is shown at the lower right of the page. Fig. 6 omits the illustration of the fan shroud 68, the oil cooler 62, and the part separating the openings 72a, 72b formed in the right cover 14, and the flow of air through the exhaust duct 80 is shown by arrows.

[0052] 4, the exhaust duct 80 includes an upper plate portion 81, a front side plate portion 82, and a lower plate portion 83 so as to form a generally rectangular cylindrical frame in which the rectangular outer shape of the radiator 61 extends toward the right cover 14. Furthermore, the exhaust duct 80 of this embodiment includes a partition plate 91 that separates the exhaust flow path in the duct into upper and lower portions.

[0053] In this embodiment, due to the arrangement of the radiator 61 and the shape of the right cover 14, an air exhaust flow path is formed by a duct structure substantially consisting of three plate members, an upper plate 81, a front side plate 82, and a lower plate 83, and the arc-shaped inner wall of the right cover 14 is located in an opposing position to the rear of the front side plate 82. Note that in cases where the excavator 1 is a machine capable of leaving a wide space between the radiator 61 and the right cover 14 compared to the size of the radiator 61, a rear side plate may be disposed opposite to the rear of the front side plate 82 to form a substantially rectangular tubular duct structure.

[0054] In a plan view, the upper plate portion 81 has a substantially right-angled triangular shape, with the hypotenuse portion conforming to the arc shape of the right cover 14. Of the two sides of the upper plate portion 81 that sandwich the right angle, the longer side having a length corresponding to the length of the radiator 61 in the front-to-rear direction is provided with mounting pieces 81a, 81a that can be mounted on a support member on the radiator 61 side. The upper plate portion 81 is disposed with its plate surface horizontal so as to cover the space between the radiator 61 and the right cover 14 from above.

[0055] The front side plate portion 82 is a portion formed integrally with the upper plate portion 81 by bending a metal plate at a substantially right angle so as to have a plate surface perpendicular to the upper plate portion 81. The front side plate portion 82 is suspended downward from the upper plate portion 81, and thereby also functions as a bulkhead that separates the space in the engine room 11 in which the hydraulic oil tank 52 and the like are disposed from the inside of the exhaust duct 80.

[0056] A lower plate portion 83 is provided at a position facing the upper plate portion 81. The lower plate portion 83 has an approximately right-angled triangular shape like the upper plate portion 81, and is composed of a support portion 85 and a movable plate portion 86 that is connected to the support portion 85 via a hinge 84 and is provided rotatably relative to the support portion 85. The support portion 85 is extended from the lower end of the front side plate portion 82 so as to protrude rearward. The support portion 85 is a plate body having an approximately L-shape in a plan view, and is connected to the front side plate portion 82 with the bottom of the L-shape as the connection side with the front side plate portion 82. The movable plate portion 86 has an approximately right-angled triangular shape with two sides surrounded by the L-shape of the support portion 85. The oblique side of the approximately right-angled triangular movable plate portion 86 also serves as the oblique side of the approximately right-angled triangular shape of the lower plate portion 83 together with the edge of the support portion 85. In addition, an engagement piece 86a that engages with the upper surface of the support portion 85 is provided on the edge of the movable plate portion 86 on the front side plate portion 82 side. This prevents the movable plate portion 86 from rotating downward from the support portion 85.

[0057] Of the two sides of the L-shaped corner of the support portion 85 of the lower plate portion 83, the longer side 83a along the radiator 61 side is provided with mounting pieces 85a, 85a for mounting to the support member 67 on the lower end side of the radiator 61.

[0058] The exhaust duct 80 is disposed between the radiator 61 and the right cover 14 by attaching the mounting pieces 85a, 85a of the lower plate portion 83 and the mounting pieces 81a, 81a of the upper plate portion 81 to a support member on the radiator 61 side by screw fastening.

[0059] Further, the battery 54 is disposed in the space below the lower plate portion 83, the upper part of which is covered with a battery cover 55 made of an insulating material such as rubber. During maintenance such as replacement of the battery 54, the upper part of the battery 54 can be opened by rotating the lower plate portion 83 upward about the hinge shaft. Furthermore, the lower plate portion 83, which is made up of the support portion 85 and the movable plate portion 86, is provided with a tilt upward in the direction toward the ventilation port.

[0060] In this embodiment, the upper plate portion 81 is arranged so that the plate surface is horizontal, but like the lower plate portion 83, the upper plate portion 81 may also be arranged so that the direction toward the ventilation port is inclined upward.

[0061] As shown in FIG. 5, the partition plate 91 has a substantially right-angled triangular shape similar to the upper plate portion 81, and of the two sides sandwiching the right angle, the long side 91a is disposed along the radiator 61 side. An engagement protrusion 92a is provided near the rear end of the long side 91a, and an engagement protrusion 92b is provided near the corner formed by the long side 91a and the short side 91b. The engagement protrusion 92b is inserted into a hole 82b as an engagement receiving portion provided in the front side plate portion 82, and the engagement protrusion 92a is engaged with an engagement receiving portion (not shown), such as a recess or a hole, provided in the support plate 69 that supports the rear side end surface of the radiator 61, so that the partition plate 91 is provided in the exhaust duct 80 so as to be rotatable about a straight line connecting the engagement protrusion 92a and the engagement protrusion 92b of the partition plate 91 as a rotation axis. That is, the front side plate portion 82 and the support plate 69 of the radiator 61 become support members that form the side walls of the exhaust flow passage. The support plate 69 is provided so as to cover the entire rear portion of the radiator 61 .

[0062] In addition, the hole 82b in the front side plate portion 82 is provided at a height position that is approximately one-third of the height of the front side plate portion 82. In this embodiment, as shown in Fig. 4, the engagement receiving portion for engaging the engagement protrusion 92a with the support plate 69 is provided at a height position equivalent to that of the hole 82b, but by making the height positions of the engagement receiving portion on the support plate 69 and the hole 82b of the front side plate portion 82 different, for example, the partition plate 91 may be provided with an inclination low at the front and high at the rear in the front-rear direction.

[0063] In addition, an engaging protrusion 92c that fits into a hole 82c provided in the front side plate 82 is provided near the end of the short side 91b of the partition plate 91 opposite to the engaging protrusion 92b side. The hole 82c is provided at a position higher than the hole 82b. Therefore, by fitting the engaging protrusion 92b into the hole 82b and the engaging protrusion 92c into the hole 82c, the position of the partition plate 91 is fixed in the exhaust duct 80 with the direction toward the vent opening tilted upward. That is, the engaging protrusion 92c of the partition plate 91 functions as a fixing part that fixes the inclination angle and position of the partition plate 91 with respect to the corresponding hole 82c. That is, the engaging protrusion 92c serves as a locking part for locking and fixing the partition plate 91, which is supported by the engaging protrusion 92a and the engaging protrusion 92b to be rotatable with the rotation axis direction being approximately the front-rear direction, to the front side plate 82.

[0064] In the front side plate portion 82, a plurality of holes 82c are provided at positions along a circular arc-shaped locus that is the movement locus of the engaging protrusion 92c when the partition plate 91 is rotated. In this embodiment, three holes 82c are arranged at a predetermined interval (for example, at intervals of 5 degrees around a circumference centered on the rotation axis of the partition plate 91). With this configuration, it is possible to easily change the inclination angle of the partition plate 91 in the direction from the radiator 61 toward the vent by changing the height position at which the engaging protrusion 92c is fitted. The inclination angle of the partition plate 91 is set to be larger than the inclination angle of the lower plate portion 83.

[0065] 6, by providing the partition plate 91 in the exhaust duct 80, the air exhaust flow path is separated into a first flow path 93 below the partition plate 91 and a second flow path 94 above the partition plate 91. The lower surface of the first flow path 93 is formed by the lower plate portion 83, and the upper surface of the first flow path 93 is formed by the partition plate 91. The lower surface of the second flow path 94 is formed by the partition plate 91, and the upper surface of the second flow path 94 is formed by the upper plate portion 81.

[0066] In addition, by arranging the partition plate 91 so as to be inclined upward in the direction toward the ventilation opening, the flow path cross-sectional area of ​​the first flow path 93 gradually becomes wider toward the ventilation opening, and the flow path cross-sectional area of ​​the second flow path 94 gradually becomes narrower toward the ventilation opening.

[0067] In this embodiment, the engagement height of the engagement protrusions 92a and 92b of the partition plate 91 is set so that the opening area of ​​the second flow passage 94 on the radiator 61 side is larger than that of the first flow passage 93.

[0068] In the configuration provided with the exhaust duct 80 as described above, a substantially rectangular outlet opening is formed as an opening on the outlet side of the exhaust air by the outer edges of the upper plate portion 81, the front side plate portion 82, the lower plate portion 83, and the support plate 69. This outlet opening is closed by the right cover 14 having an air vent. A seal member (not shown) made of rubber or the like is provided along the edge of the outlet opening, and the right cover 14 is in close contact with the outlet opening via the seal member.

[0069] In an excavator 1 equipped with exhaust duct 80 configured as described above, air is blown towards radiator 61 by rotation of cooling fan 65, as shown by the outline arrow in Fig. 6. Air passing between the fins of radiator 61 absorbs heat from radiator 61, becomes a flow of heated air, passes through exhaust duct 80, and is exhausted to the outside of the machine body mainly through upper and lower openings 72a, 72b into which grill 74 is fitted.

[0070] In the exhaust duct 80, in the second flow passage 94 above the partition plate 91, the flow passage cross-sectional area opening to the right cover 14 side, which is the air outlet, is smaller than the flow passage cross-sectional area opening to the radiator 61 side, which is the air inlet, so the flow speed of the exhaust air increases toward the outlet. Note that the amount of air moving inside the exhaust duct 80 per unit time [air volume Q (m 3 / min)] is Q=V×A×60 [V is the air speed in the duct (m / s), A is the cross-sectional area of ​​the duct (m 2 ) can be obtained from the above equation. From this, if the amount of air moved by the cooling fan 65 rotating at a predetermined rotation speed is constant and half of the amount of air passes through the first flow path 93 and the second flow path 94, respectively, the air discharged to the outside of the aircraft from the second flow path 94, whose flow path cross-sectional area is smaller on the vent side, will have a high wind speed, and the air discharged to the outside of the aircraft from the first flow path 93, whose flow path cross-sectional area is larger on the vent side, will have a low wind speed. In other words, such an inclined arrangement of the partition plate 91 makes the flow of air discharged from the second flow path 94 faster than the flow of air discharged from the first flow path 93.

[0071] Since the flow of air discharged from the second flow passage 94 is faster than the flow of air discharged from the first flow passage 93, the air discharged from the first flow passage 93 is attracted to the flow velocity of the air discharged from the second flow passage as shown in Fig. 6, and flows upward to join the flow of air from the second flow passage 94. In other words, the flow of air discharged from the first flow passage 93 is formed toward the flow of air discharged from the second flow passage 94. Therefore, it is possible to efficiently guide the exhaust air discharged outside the aircraft body upward.

[0072] By arranging the partition plate 91 at an angle within the exhaust duct 80, the exhaust air from the machine body is directed upward rather than horizontally, so that while the excavation machine 1 is operating, the hot exhaust air does not directly hit the low road trees and / or flowers in the flower beds that are located at the same height as the lower opening 72b of the right cover 14, preventing these plants from withering due to the heat.

[0073] In this embodiment, the front side plate 82 is disposed so that its plate surface is approximately perpendicular to the air blowing surface of the radiator 61, but in order to blow the exhaust air further rearward in the aircraft body, the front side plate 82 may be disposed so as to be inclined at an acute angle to the air blowing surface of the radiator 61 in a plan view. In such a case, the shape of the partition plate 91 is of course changed according to the inclination of the front side plate 82 of the exhaust duct 80.

[0074] The excavation machine 1 of this embodiment having the above-mentioned configuration can be said to have the following configuration: That is, the excavation machine 1 is a work machine in which an exterior cover (right cover 14) is provided with vent holes (openings 72a, 72b, slits 73) communicating with the engine room 11, and a partition plate 91 that separates an air exhaust flow path (exhaust duct 80) into upper and lower portions is arranged at an angle upward from the inside of the engine room 11 toward the vent hole between a heat exchanger (heat exchange unit 60, radiator 61, oil cooler 62) arranged at a position facing the vent holes (openings 72a, 72b, slits 73) and the exterior cover (right cover 14) in which the vent hole is provided.

[0075] According to the excavation machine 1 of this embodiment, the partition plate 91 is arranged inclined upward from the inside of the engine room 11 toward the vent, so that the exhaust air flow path from the engine room 11 is separated into upper and lower parts, and the exhaust air from the lower flow path is mixed with the exhaust air from the upper flow path, so that the exhaust air can be guided upward. In this way, by directing the air flow from the engine room toward the vent upward, the air exhausted from the vent to the outside of the machine body can be discharged from the vent as an upward flow, and the exhaust air from the engine, etc., discharged from the engine room is prevented from being blown onto the plants around the excavation machine 1 during excavation work. In addition, the exhaust air can be prevented from being blown onto workers, pedestrians, etc. passing by the side of the excavation machine 1.

[0076] In the excavation machine 1, the partition plate 91 separates the exhaust flow path (air exhaust duct 80) into a first flow path 93 below the partition plate 91, the flow path cross-sectional area of ​​which gradually increases from the radiator 61 side toward the vent, and a second flow path 94 above the partition plate 91, the flow path cross-sectional area of ​​which gradually decreases from the radiator 61 side toward the vent. In other words, the partition plate 91 is disposed so that the flow of air exhausted from the second flow path 94 above the partition plate 91 is faster than the flow of air exhausted from the first flow path 93 below the partition plate 91. In the excavation machine 1, the flow of air exhausted from the first flow path 93 is formed toward the flow of air exhausted from the second flow path 94.

[0077] According to the excavator 1 configured as described above, the second flow passage 94 formed in the exhaust flow passage (air exhaust duct 80) is formed with a narrower outlet on the vent side than the inlet of the second flow passage 94 on the engine room 11 side for the air flow from the engine room 11 toward the vent, so that the flow rate of the exhaust air is faster at the air outlet side. In other words, the air flows faster in the second flow passage 94, whose flow passage cross-sectional area gradually narrows toward the vent, than in the first flow passage 93, whose flow passage cross-sectional area gradually widens toward the vent. Therefore, the air flow discharged from the first flow passage 93, whose flow rate is slower than the air flow discharged from the second flow passage 94, is attracted to the air flow discharged from the second flow passage 94. In this way, the exhaust air from the lower first flow passage 93 is more likely to be caught in the exhaust air from the upper second flow passage 94, so that the exhaust air can be guided upward more efficiently.

[0078] In the excavator 1, the cross-sectional area of ​​the first flow passage 93 on the heat exchanger (heat exchange unit 60, radiator 61, oil cooler 62) side is larger than the cross-sectional area of ​​the second flow passage 94 on the heat exchanger side.

[0079] With the excavator 1 configured in this manner, the amount of air discharged from the second flow passage 94 above the partition plate 91 is greater than the amount of air discharged from the first flow passage 93. That is, the amount of air discharged from the first flow passage 93 can be reduced. In addition, because the air inlet of the second flow passage 94 is larger, the speed of the air discharged from the second flow passage 94 can be increased. Therefore, the air discharged from the lower first flow passage 93 is more likely to be caught in the air discharged from the upper second flow passage 94, so the air discharged can be guided upward more efficiently.

[0080] Further, in the excavator 1, a lower plate portion 83 serving as a lower surface portion forming the lower surface of the first flow passage 93 is disposed below the partition plate 91 and inclined upwards towards the ventilation opening.

[0081] With the excavator 1 configured in this manner, the flow of air discharged from the first flow path 93 can be guided further upward by the lower plate portion 83. Note that in this embodiment, since the battery 54 is disposed below the exhaust flow path (air exhaust duct 80), the battery cover 55 that covers the upper surface of the battery 54 may be shaped in a way that replaces the lower plate portion 83, for example.

[0082] Furthermore, in the excavation machine 1, the partition plate 91 is provided so that the inclination angle thereof can be changed.

[0083] With the excavation machine 1 configured in this way, the inclination angle of the partition plate 91 can be changed as appropriate according to the specifications of the excavation machine 1 and the arrangement of the devices on the rotating frame 7. This makes it possible to easily adjust the discharge direction of the exhaust air from each of the exhaust flow passages above and below the partition plate 91 according to the specifications (size) of the excavation machine 1.

[0084] In addition, in the present embodiment, the configuration for changing the inclination angle of the partition plate 91 is configured to provide three holes 82c as a plurality of holes for adjusting the angle, so that the inclination angle of the partition plate 91 can be changed in three stages: upper, middle, and lower. The number of holes 82c is not limited. In addition, it is preferable to close the holes 82c (open holes 82c) among the plurality of holes 82c that are not used to support the partition plate 91 with a closing member such as a clip such as a tree clip or a screw. By closing the holes 82c with a closing member, it is possible to prevent the air flowing into the exhaust duct 80 by the rotating cooling fan 65 from leaking into the inside of the machine body through the holes 82c, and the cooling effect of the cooling fan 65 can be maintained.

[0085] The partition plate 91 is pivotally mounted to a support member (front side plate portion 82, support plate 69) that forms the side wall of the discharge flow path, and has a fixing portion (engagement protrusion 92c) that fixes the inclination of the partition plate 91 relative to the support member.

[0086] With an excavation machine 1 configured in this way, it is easy to adjust the direction of the exhaust air by changing the inclination angle of the partition plate 91 and to fix the partition plate 91. Furthermore, even in a small excavation machine 1, the partition plate 91 can be easily installed.

[0087] The above-mentioned embodiment is an example of the present invention, and the working machine according to the present invention is not limited to the above-mentioned embodiment. Therefore, even if it is an embodiment other than the above-mentioned, various modifications are possible according to the design, etc., as long as they do not deviate from the technical idea of ​​the present invention. Furthermore, the effects described in this disclosure are merely examples and are not limited, and other effects may be obtained.

[0088] The present invention can take the following forms. (1) A working machine having an exterior cover provided with a vent communicating with an engine room, an air exhaust flow passage is formed between a heat exchanger arranged at a position facing the vent hole and an exterior cover provided with the vent hole, and a partition plate dividing the exhaust flow passage into upper and lower portions is arranged in the exhaust flow passage at an incline upward from the engine room side toward the vent hole. Working machinery. (2) The partition plate separates the discharge flow path into a first flow path which is located below the partition plate and has a flow path cross-sectional area which gradually becomes wider from the engine room side toward the vent port, and a second flow path which is located above the partition plate and has a flow path cross-sectional area which gradually becomes narrower from the engine room side toward the vent port. The work machine described in (1) above. (3) a cross-sectional area of ​​the second flow path on the heat exchanger side is larger than a cross-sectional area of ​​the first flow path on the heat exchanger side; The work machine described in (2) above. (4) The second flow path is configured so that the flow of air is faster than the flow of air discharged from the first flow path. The working machine according to (2) or (3) above. (5) The first flow path is configured such that a flow of air discharged from the first flow path is formed toward a flow of air discharged from the second flow path. A work machine according to any one of (2) to (4). (6) A lower surface portion forming a lower surface of the first flow path is disposed below the partition plate and inclined upward toward the vent port. A work machine according to any one of (2) to (5). (7) The partition plate is provided so that the inclination angle can be changed. A work machine according to any one of (1) to (6). (8) The partition plate is pivotally mounted on a support member that forms a side wall of the discharge flow path, and has a fixing portion that fixes an inclination of the partition plate with respect to the support member. The work machine according to (7) above. [Explanation of symbols]

[0089] 1 Excavation machine (work machine) 2 Running vehicle 5 Running part 7 Swivel Frame 10 Driving section 11. Engine Room 12 Engine 14 Right cover (exterior cover) 20A Undercarriage 20B Upper rotating body 52 Hydraulic Oil Tank 54 Battery 55 Battery cover 60 Heat exchange unit (heat exchanger) 61 Radiator (heat exchanger) 62 Oil cooler (heat exchanger) 65 Cooling Fan 68 Fan shroud 69 Support plate (support member) 72a Opening (vent) 72b Opening (vent) 73 Slit (vent) 74 Grill 80 Exhaust duct (exhaust flow path) 81 Upper plate 82 Front side plate portion (support member) 83 Lower plate part (lower surface part) 86 Movable plate part 91 Partition 92c Engagement convex part (fixed part) 93 First Stream 94 Second Stream

Claims

1. A working machine having an exterior cover provided with a vent communicating with an engine room, an air exhaust flow passage is formed between a heat exchanger arranged at a position facing the vent hole and an exterior cover provided with the vent hole, and a partition plate dividing the exhaust flow passage into upper and lower portions is arranged in the exhaust flow passage at an upward incline from the engine room side toward the vent hole; Working machinery.

2. the partition plate separates the discharge flow path into a first flow path which is located below the partition plate and has a flow path cross-sectional area which becomes wider from the engine room side toward the vent port, and a second flow path which is located above the partition plate and has a flow path cross-sectional area which becomes narrower from the engine room side toward the vent port.

2. The work machine of claim 1.

3. a cross-sectional area of ​​the second flow path on the heat exchanger side is larger than a cross-sectional area of ​​the first flow path on the heat exchanger side; 3. A work machine according to claim 2.

4. The second flow path is configured so that the flow of air is faster than the flow of air discharged from the first flow path.

4. A work machine according to claim 3.

5. The first flow path is configured such that a flow of air discharged from the first flow path is formed toward a flow of air discharged from the second flow path.

5. A work machine according to claim 4.

6. A lower surface portion forming a lower surface of the first flow path is disposed below the partition plate and inclined upward toward the vent port.

3. A work machine according to claim 2.

7. The partition plate is provided so that the inclination angle can be changed. A work machine according to any one of claims 1 to 6.

8. The partition plate is pivotally mounted on a support member that forms a side wall of the discharge flow path, and has a fixing portion that fixes an inclination of the partition plate with respect to the support member.

8. A work machine according to claim 7.

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