Work machine

Abstract

The invention provides a work machine capable of efficiently guiding exhaust air from an engine room to the upper part of the outside of a machine body from a ventilation opening. An exhaust passage (80) provided between a radiator (61) disposed in an engine compartment (11) and a right cover (14) in which a vent is formed is configured to include an upper plate portion (81), a front side plate portion (82), and a lower plate portion (83) so that the radiator (61) is formed as a substantially square cylindrical frame extending and protruding toward the right cover (14). And a partition plate (91) for vertically partitioning an air discharge flow path in the passage into a first flow path (93) on the lower side and a second flow path (94) on the upper side.

Description

Technical Field

[0001] The present invention relates to a working machine having a ventilating opening in an outer cover. Background Art

[0002] In the past, some working machines, such as excavators, consisted of a lower traveling body, an upper rotating body, and a working device. The lower traveling body had a pair of left and right crawler-type traveling parts, the upper rotating body was rotatably connected to the lower traveling body, and the working device was arranged on the rotating frame of the upper rotating body so as to be able to pitch and fall. The rotating frame of the upper rotating body was provided with a driving part and an engine room. The driving part was provided with a driving seat for an operator to operate the working device, etc., and the engine room was provided with various equipment including an engine, and the engine room was covered by an outer cover.

[0003] In addition, in such a working machine, a vent is provided in the outer cover for cooling the engine and the like, so that the air in the engine room is discharged to the outside.

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

[0005] Patent Document 1: Japanese Patent Application Publication No. 2004-352089

[0006] In the operating machine disclosed in Patent Document 1, in a vent having a structure in which a grille is embedded in the opening of the outer cover, the plate-like fins of the grille which are arranged horizontally in the front-rear direction in parallel with each other are arranged in an inclined manner so that the outer side of the machine body is upward. That is, by adjusting the inclination angle of the plate-like fins of the grille, the air containing heat which passes through the radiator due to the action of the cooling fan is ejected obliquely upward from the vent. However, it is not possible to efficiently guide the exhaust air upward by simply changing the inclination angle of the fins of the grille. Therefore, for example, the following problem arises: during excavation work beside the road, the exhaust air containing heat ejected from the vent is blown toward the shrubs, roadside trees, and / or flowers and plants in the flower bed which are at the same height or lower than the exhaust port, and these plants sometimes wither due to the heat. Summary of the invention

[0007] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a working machine capable of efficiently guiding exhaust air from an engine room through a ventilator toward the outside and upward of a machine body.

[0008] The working machine involved in the present invention is a working machine with a vent connected to the engine room provided on the outer cover, wherein an air exhaust flow path is formed between a heat exchanger arranged at a position opposite to the above-mentioned vent and the outer cover provided with the above-mentioned vent, and a partition plate that separates the above-mentioned exhaust flow path from top to bottom is arranged to be inclined upward from the inside of the above-mentioned engine room toward the above-mentioned vent.

[0009] Another aspect of the present invention relates to a working machine: in the above-mentioned working machine, the above-mentioned partition plate separates the above-mentioned exhaust flow path into a first flow path and a second flow path, the above-mentioned first flow path is on the lower side of the above-mentioned partition plate and the flow path cross-sectional area increases from the inside of the above-mentioned engine room toward the above-mentioned vent, and the above-mentioned second flow path is on the upper side of the above-mentioned partition plate and the flow path cross-sectional area decreases from the inside of the above-mentioned engine room toward the above-mentioned vent.

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

[0011] A working machine according to still another aspect of the present invention is the working machine described above, wherein the second flow path is configured so that a flow of air is faster than a flow of air exhausted from the first flow path.

[0012] A working machine according to still another aspect of the present invention is the working machine described above, wherein the first flow path is configured to form a flow of the air exhausted from the first flow path toward a flow of the air exhausted from the second flow path.

[0013] A working machine according to still another aspect of the present invention is the working machine described above, wherein a lower surface portion of a lower surface forming the first flow path is disposed below the partition plate so as to be inclined upward toward the ventilating port.

[0014] A working machine according to still another aspect of the present invention is the working machine described above, wherein the partition plate is provided so as to be able to change its inclination angle.

[0015] A working machine according to another aspect of the present invention is the working machine described above, wherein the partition plate is pivotally mounted on a support member forming a side wall of the discharge flow path, and includes a fixing portion that fixes the partition plate at an inclination relative to the support member.

[0016] According to the present invention, in the structure in which the outer cover has the vents, the exhaust air discharged from the vents can be efficiently guided upward to the outside of the machine body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a left side view of the excavator according to one embodiment of the present invention.

[0018] Figure 2 It is a right side view of the upper swing body of the excavator according to the embodiment of the present invention.

[0019] Figure 3 It is a schematic plan view showing the arrangement of equipment in the upper revolving body of the excavator according to one embodiment of the present invention.

[0020] Figure 4 It is a partial perspective view showing the structure of the periphery of an exhaust duct arranged inside the outer cover of an excavator according to an embodiment of the present invention.

[0021] Figure 5 It is an exploded perspective view of an exhaust duct of an excavator according to an embodiment of the present invention.

[0022] Figure 6 It is a schematic cross-sectional view schematically showing exhaust air through an exhaust duct of an excavator according to an embodiment of the present invention.

[0023] Description of Reference Numerals

[0024] 1…excavator (working machine); 2…traveling body; 5…traveling part; 7…slewing frame; 10…driving part; 11…engine room; 12…engine; 14…right cover (outer cover); 20A…lower travelling body; 20B…upper slewing body; 52…working oil tank; 54…battery; 55…battery cover; 60…heat exchange unit (heat exchanger); 61…radiator (heat exchanger); 62…oil cooler (heat exchanger); 65…cooling air Fan; 68…fan cover; 69…support plate (support component); 72a…opening (vent); 72b…opening (vent); 73…slit (vent); 74…grille; 80…exhaust passage (exhaust flow path); 81…upper plate portion; 82…front side plate portion (support component); 83…lower plate portion (lower portion); 86…movable plate portion; 91…partition plate; 92c…engaging protrusion (fixing portion); 93…first flow path; 94…second flow path. DETAILED DESCRIPTION

[0025] The present invention studies the structure of the exhaust passage in view of the structure in which the outer cover has a vent, so as to efficiently guide the air from the vent to the upper part outside the machine body.

[0026] In the embodiment of the present invention, as the working machine involved in the present invention, an excavator (excavator) as a rotary working vehicle is used as an example for description. However, the working machine involved in the present invention is not limited to the excavator, and can also be widely applied to other working machines such as bulldozers, cranes, small truck loaders, slide loaders, and wheel loaders.

[0027] The structure of the excavator 1 according to the present embodiment will be described using the accompanying drawings. In addition, hereinafter, the "front side", "rear side", "left and right sides", "plane side" or "upper side", "bottom side" or "lower side" are referred to based on the position of the operator sitting in the driver's seat of the excavator 1, unless a direction view is specifically specified.

[0028] Figure 1 It is a left side view of the excavator 1 according to the present invention. Figure 2 It is a right side view of the upper rotating body 20B. Figure 2 In the figure, the excavating device 3 and the driving unit 10 are omitted.

[0029] like Figure 1 As shown, the excavator 1 includes a self-propelled traveling body (machine body) 2, and an excavating device 3 and a soil-discharging device 4 as a working machine mounted on the traveling body 2. The traveling body 2 is composed of a lower traveling body 20A having a traveling portion 5, and an upper revolving body 20B rotatably provided on the upper part of the lower traveling body 20A. The soil-discharging device 4 is mounted on the lower traveling body 20A side. In addition, the excavating device 3 is mounted on the upper revolving body 20B side.

[0030] The lower traveling structure 20A includes a pair of left and right crawler-type traveling sections 5 , 5 , and a machine frame 6 as a base interposed between the left and right traveling sections 5 , 5 .

[0031] The traveling section 5 has a structure in which a crawler belt is wound around a sprocket, an idler wheel, and a plurality of rollers supported by a machine frame 6. The traveling section 5 has a driving sprocket 5a, which is a driving wheel, at its rear end.

[0032] The earthmoving device 4 is mounted on the front side of the machine frame 6. The earthmoving device 4 is provided to be able to rotate up and down relative to the lower traveling body 20A. The earthmoving device 4 includes a pair of left and right arms 4b and an earthmoving blade or bulldozer 4a provided at the front ends of the pair of left and right arms 4b.

[0033] The left and right arms 4b are provided to extend in the front-rear direction between the left and right traveling parts 5, 5. The base ends of the left and right arms 4b are supported by an arm support bracket (not shown) provided at the front of the machine frame 6 with the left and right directions as the rotation axis directions. Moreover, the left and right arms 4b are rotated up and down by the extension and contraction of the bulldozer cylinder (not shown). That is, the bulldozer 4a is rotated up and down via the left and right arms 4b by the extension and contraction of the bulldozer cylinder.

[0034] The upper revolving body 20B has a revolving frame 7 rotatably mounted on the travel section 5. The revolving frame 7 is connected to the machine frame 6 via a revolving bearing 6a, and is configured to be rotatable in either direction of the left or right relative to the machine frame 6 around a revolving axis with the up-down direction as the axial direction by a revolving motor (not shown).

[0035] The revolving frame 7 has a substantially circular shape when viewed from above, and is a structure that serves as a base for the upper revolving body 20B. Figure 3 ) is provided on the front side of the support bracket 41. The 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 excavating device 3 so as to be rotatable in the front-rear direction.

[0036] The excavating device 3 includes a boom 21 constituting a portion on the base side thereof, an arm 22 connected to the front end side of the boom 21, and a bucket 23 attached to the front end of the arm 22. In addition, the excavating device 3 includes a boom cylinder 26 for rotating the boom 21, an arm cylinder 27 for rotating the arm 22, and a bucket cylinder 28 for rotating the bucket 23.

[0037] The base end of the boom 21 is supported by a swing bracket 42. The swing bracket 42 is swingably supported in the left-right direction by the support bracket 41. More specifically, the swing bracket 42 is supported by the support bracket 41 protruding from the revolving frame 7 via a connecting shaft having a vertical direction as a rotation axis direction.

[0038] The swing bracket 42 supports the base end of the boom 21 so that it can rotate with the left-right direction as the rotation axis direction, and supports the lower end of the boom cylinder 26. In addition, a portion of the front end of a rod connected to a swing cylinder (not shown) is provided on the swing bracket 42. Therefore, the swing bracket 42 rotates around the connecting axis by the operation of the swing cylinder, so that the excavating device 3 swings in the left-right direction.

[0039] The boom cylinder 26, the arm cylinder 27, the bucket cylinder 28, and the swing cylinder are all double-acting hydraulic cylinders that are actuated by the pressure oil ejected from the hydraulic pump (not shown). Hydraulic pipes for hydraulic supply and hydraulic discharge are connected to each hydraulic cylinder. In addition, in the excavating device 3, the bucket 23 can be detachably mounted as an attachment for operation, and other attachments such as a gripper (fork) or a crusher (crusher) can be mounted to replace the bucket 23 according to the operation content.

[0040] The revolving frame 7 is provided with: a driving portion 10 for an operator to drive and operate the travel portion 5 and the working machine; and an engine room 11 (reference) which accommodates an engine 12, a battery 54, a fuel tank 51 for the engine, and a working oil tank 52 for the hydraulic cylinder Figure 3The engine room 11 is provided on the revolving frame 7 from the right side to the rear of the cab 10 .

[0041] The revolving frame 7 has an outer cover that forms the outer shape of the upper revolving body 20B. The outer cover is a component that surrounds the equipment arranged on the base plate 7a of the revolving frame 7 and forms the engine room 11. The outer cover is composed of a plurality of components of different shapes and sizes according to the shape of the revolving frame 7 and the structural configuration of the revolving frame 7. That is, the outer cover is configured to include: a rear cover 13 on the upper side of the counterweight 9 and covering the rear of the engine room 11; a right cover 14 covering the right side surface of the engine room 11 which becomes the right side of the revolving frame 7; a right lower cover 15 covering the lower right side of the engine room 11; a right front cover 16 covering the right front of the engine room 11; and a left rear cover 19 covering the left rear of the engine room 11.

[0042] The right cover 14 is provided with a plurality of vents for connecting the engine room 11, which is a space enclosed by the outer cover, with the outside. Figure 3 ) action, the high-temperature air in the engine room 11 passes through multiple vents and is discharged.

[0043] The counterweight 9 is used to achieve weight balance with the excavating device 3. The counterweight 9 is attached to a stay (not shown) erected on the base plate 7a of the revolving frame 7, for example, so as to cover the rear of the engine room 11 below the rear cover 13.

[0044] The driving section 10 is used to drive and operate the traveling vehicle body 2 and the excavating device 3, and has a flat floor section 8. The floor section 8 is provided on the left side of the front half of the revolving frame 7, and the left side of the revolving frame 7 serves as a boarding port for operators. In addition, a canopy 30 is provided on the driving section 10. The canopy 30 has: a pair of left and right pillars 31, 31 erected above the engine room 11 behind the driving section 10; and a canopy top 32 supported by the pair of left and right pillars 31, 31. The canopy top 32 covers the driving section 10 from directly above.

[0045] In the driving part 10, a driver's seat support platform 34 is provided on the rear side of the floor part 8, and a driver's seat 35 is provided on the driver's seat support platform 34. In front of the driver's seat 35, a pair of left and right travel levers 36 are provided in a state of extending upward from the floor part 8. A plurality of operating pedals 37 for operation are arranged on the left and right sides of the travel levers 36 on the floor part 8. In addition, in the driving part 10, an operation operating lever for operating an operating machine such as the excavator 3 and an operation panel having various operating parts such as switches are provided around the driver's seat 35.

[0046] In the excavator 1 having the above-described structure, the operator sitting in the driver's seat 35 appropriately operates the travel lever 36 and / or the work operating lever, etc., to perform desired actions and operations. For example, by operating the travel lever 36, the travel unit 5 is driven to travel straight forward or left and right, and by operating the work operating lever, an excavation operation using the excavating device 3, or a soil removal operation and / or a land leveling operation using the soil removal device 4 is performed.

[0047] The structure related to cooling of the engine 12 and the hydraulic oil in the engine room 11 of the excavator 1 according to the present embodiment will be further described.

[0048] Figure 3 20B is a schematic plan view showing the arrangement of equipment and the like in the upper slewing body 20B. Figure 3 , the left portion of the upper revolving body 20B is broken away, and the arrangement of the equipment and the like in the engine room 11 is shown from the right side to the rear on the revolving frame 7 .

[0049] The engine room 11 is formed as a space with the base plate 7a of the revolving frame 7 as a floor, the right side surface covered by the right cover 14, and the rear portion covered by the rear cover 13 and the counterweight 9. The fuel tank 51, the hydraulic oil tank 52, the battery 54, and the heat exchange unit 60 are arranged at a position on the right side of the revolving frame 7 of the engine room 11. The engine 12 is arranged at a position on the rear side of the revolving frame 7 than the center. The engine 12 is, for example, a diesel engine.

[0050] The right cover 14 has an arc shape along the outer shape of the revolving frame 7 when viewed from above. Two openings 72a and 72b are provided above and below the right cover 14. The openings 72a and 72b have a substantially rectangular shape with the long side in the front-to-back direction when viewed from the side, and penetrate the right cover 14. Each opening 72a and 72b is inclined so that the front side of the long side is slightly lowered. A grille 74 composed of a lattice-shaped frame body that allows air circulation but prevents foreign matter such as sand and stone from passing is installed in each opening 72a and 72b. 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 and 72b to which the grille 74 is installed and the plurality of slits 73 function as a vent that connects the inside and the outside of the upper revolving body 20B.

[0051] The heat exchange unit 60 is configured to include a radiator 61 and an oil cooler 62 .

[0052] The radiator 61 has a rectangular plate shape. The radiator 61 is a heat exchanger for cooling engine cooling water, and includes a flow path through which the cooling water flows and a heat dissipation portion (fins).

[0053] The oil cooler 62 has a rectangular plate shape that is smaller than the radiator 61, and is arranged on the left side (inside) of the radiator 61 in a manner that overlaps approximately half of the surface area of ​​the radiator 61. The oil cooler 62 is a heat exchanger for cooling the working oil that operates the hydraulic cylinders, etc., and has a flow path for the working oil to flow and a heat dissipation portion. The oil cooler 62 cools the working oil that is returned to the working oil tank 52 by dissipating the heat of the return oil from each hydraulic cylinder in the heat dissipation portion.

[0054] The cooling fan 65 is disposed opposite to the heat exchange unit 60. The cooling fan 65 is, for example, an axial flow fan having a plurality of blades mounted on a cylindrical hub 65a. A fan cover 68 is provided around the cooling fan 65. The fan cover 68 is formed in a box shape so as to surround the outer periphery of the cooling fan 65.

[0055] The cooling fan 65 is configured to operate in conjunction with the driving of the engine 12 by connecting a protrusion provided at 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 is started, and stops rotating when the engine 12 is stopped. That is, the cooling fan 65 rotates during the driving of the engine 12, and the air in the engine room 11 is discharged to the outside through the vents formed in the right cover 14.

[0056] In the engine room 11, the engine 12, the cooling fan 65, the fan cover 68, the oil cooler 62, and the radiator 61 are arranged in order from the inside toward the right cover 14. That is, the radiator 61 constituting the heat exchange unit 60 is arranged opposite to the right cover 14. In addition, the arrangement of the oil cooler 62 and the radiator 61 may be reversed.

[0057] An exhaust passage 80 is provided between the radiator 61 and the right cover 14, and the exhaust passage 80 forms an exhaust flow path for the exhaust air that passes between the fins of the radiator 61 and is blown out by the operation of the cooling fan 65 to reach the openings 72a and 72b. In addition, in the present embodiment, the right cover 14 having the openings 72a and 72b formed roughly vertically is taken as an example, but the shape of the opening that serves as the vent is not limited thereto. For example, an opening larger than the openings 72a and 72b may be provided.

[0058] Reference Figures 4 to 6 The exhaust passage 80 is further described. Figure 4 In FIG. 1 , the periphery of the exhaust duct 80 after the right cover 14 is removed is shown in an enlarged manner. Figure 5 In the figure, the configuration of the partition plate 91 in the state of being installed in the exhaust duct 80 is shown by double-dashed lines, and the partition plate 91 in the state of being removed from the exhaust duct 80 is shown by solid lines, and an enlarged view of the A portion of the partition plate 91 in the removed state surrounded by a dotted circle is shown in the lower right of the paper. Figure 6In the figure, the fan cover 68, the oil cooler 62, and the portion separating the openings 72a and 72b formed in the right cover 14 are omitted, and the flow of air through the exhaust passage 80 is schematically shown by arrows.

[0059] like Figure 4 As shown, the exhaust duct 80 is configured to include an upper plate portion 81, a front side plate portion 82, and a lower plate portion 83, so as to form a substantially square cylindrical frame that extends the rectangular outer shape of the radiator 61 toward the right cover 14. In addition, the exhaust duct 80 of the present embodiment is provided with a partition plate 91 that separates the exhaust air flow path in the duct from top to bottom.

[0060] According to the arrangement of the radiator 61 and the shape of the right cover 14, in the present embodiment, the air exhaust passage is substantially formed by the passage structure composed of three plate members, namely the upper plate portion 81, the front side plate portion 82 and the lower plate portion 83, and the arc-shaped inner wall of the right cover 14 is located at a position opposite to the rear side of the front side plate portion 82. In addition, in the case of a body in which the excavator 1 can obtain a larger space between the radiator 61 and the right cover 14 than the size of the radiator 61, the rear side plate portion may be arranged opposite to the rear of the front side plate portion 82 to form a substantially square tube-shaped passage structure.

[0061] The upper plate portion 81 has a substantially right triangle shape in a plan view, and the hypotenuse portion is a shape along the arc shape of the right cover 14. The upper plate portion 81 has mounting pieces 81a, 81a that can be mounted on the support member on the radiator 61 side, provided on the long side of the two sides sandwiching the right angle and having a length corresponding to the length of the radiator 61 in the front-rear direction. The upper plate portion 81 is configured so that the plate surface is horizontal and covers the space between the radiator 61 and the right cover 14 from the upper side.

[0062] 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 orthogonal to the upper plate portion 81. The front side plate portion 82 is vertically arranged downward from the upper plate portion 81, and functions as a partition wall that separates the space where the hydraulic oil tank 52 and the like are arranged from the interior of the exhaust duct 80 in the engine room 11.

[0063] A lower plate portion 83 is provided at a position opposite to the upper plate portion 81. The lower plate portion 83 has a substantially right-angled triangle shape similar to the upper plate portion 81, and is composed of a support portion 85 and a movable plate portion 86 connected to the support portion 85 via a hinge 84 and arranged to be rotatable relative to the support portion 85. The support portion 85 is configured so that the lower end of the front side plate portion 82 is extended and protruded rearward. The support portion 85 is a plate body having a substantially L-shaped shape when viewed from above, and is connected to the front side plate portion 82 with the bottom of the L-shaped letter as the connection side with the front side plate portion 82. The movable plate portion 86 has a substantially right-angled triangle shape with two sides surrounded by the L-shaped letter of the support portion 85. In addition, the hypotenuse of the substantially right-angled triangle-shaped movable plate portion 86, together with the end edge of the support portion 85, also serves as the hypotenuse portion of the substantially right-angled triangle shape of the lower plate portion 83. In addition, the movable plate portion 86 is provided with an engagement piece 86a that engages with the upper surface of the support portion 85 at the end edge on the front side plate portion 82. Thus, the movable plate portion 86 is prohibited from rotating to a position below the support portion 85.

[0064] On two sides of the lower plate 83 sandwiching the L-shaped corner of the support portion 85 , along a long side 83 a on the radiator 61 side, mounting pieces 85 a , 85 a for mounting to the support member 67 on the lower end side of the radiator 61 are provided.

[0065] The mounting pieces 85 a , 85 a of the lower plate 83 and the mounting pieces 81 a , 81 a of the upper plate 81 are mounted to the support member on the radiator 61 side by screw fastening, so that the exhaust duct 80 is arranged between the radiator 61 and the right cover 14 .

[0066] In addition, the battery 54 whose upper part is covered by the battery cover 55 made of insulating material such as rubber is arranged in the space below the lower plate portion 83. When performing maintenance such as replacing the battery 54, the upper part of the battery 54 can be opened by rotating the lower plate portion 83 upward around the hinge axis. In addition, the lower plate portion 83 composed of the support portion 85 and the movable plate portion 86 is arranged to be inclined upward in the direction toward the vent.

[0067] In the present embodiment, the upper plate portion 81 is provided so that the plate surface becomes horizontal, but the upper plate portion 81 may be provided so as to be inclined upward in the direction toward the ventilation opening similarly to the lower plate portion 83 .

[0068] like Figure 5As shown, the partition plate 91 has a substantially right triangle shape similarly to the upper plate portion 81, and of the two sides sandwiching the right angle, the long side 91a is arranged along the radiator 61 side. In addition, a snap-fitting protrusion 92a is provided near the end of the rear side of the long side 91a, and a snap-fitting protrusion 92b is provided near the corner formed by the long side 91a and the short side 91b. The snap-fitting protrusion 92b is inserted into the hole portion 82b as the snap-fitting receiving portion provided in the front side plate portion 82, and the snap-fitting protrusion 92a is snap-fitted to the snap-fitting receiving portion (not shown) such as a recessed portion or a hole portion provided in the support plate 69 supporting the rear side end surface of the radiator 61, so that the partition plate 91 is rotatably provided in the exhaust duct 80 with the straight line formed by connecting the snap-fitting protrusion 92a and the snap-fitting protrusion 92b of the partition plate 91 as the rotation axis. That is, the front side plate portion 82 and the support plate 69 of the radiator 61 become supporting members that form the side wall of the exhaust flow path. The support plate 69 is provided to cover the rear surface portion of the heat sink 61 as a whole.

[0069] In addition, in the front side plate portion 82, the hole portion 82b is provided at a height position of approximately one third of the length in the height direction of the front side plate portion 82. Figure 4 As shown, the engaging portion that enables the engaging protrusion 92a to engage with the supporting plate 69 is set at the same height position as the hole portion 82b, but the height positions of the engaging portion on the supporting plate 69 side and the hole portion 82b of the front side plate portion 82 can also be different, and for example, the partition plate 91 can be set to be inclined in the front-to-back direction with the front lower and the rear higher.

[0070] In addition, an engaging convex portion 92c that is engaged with the hole portion 82c provided in the front side plate portion 82 is provided near the end of the short side 91b of the partition plate 91 on the opposite side to the engaging convex portion 92b side. The hole portion 82c is provided at a position higher than the hole portion 82b. Therefore, by engaging the engaging convex portion 92b to engage with the hole portion 82b, engaging the engaging convex portion 92c to engage with the hole portion 82c, and in the exhaust passage 80, the partition plate 91 is fixed in a state of being tilted upward in the direction toward the vent. That is, the engaging convex portion 92c of the partition plate 91 functions as a fixing portion that fixes the inclination angle and position of the partition plate 91 relative to the corresponding hole portion 82c. That is, the engaging convex portion 92c is a fixing portion that is used to fix the partition plate 91 supported by the engaging convex portion 92a and the engaging convex portion 92b to be able to rotate in the direction of the rotation axis in the approximately front-back direction relative to the front side plate portion 82.

[0071] In the front side plate portion 82, a plurality of holes 82c are provided at positions along the arc-shaped trajectory that becomes the moving trajectory of the engaging protrusion 92c when the partition plate 91 is rotated. In the present embodiment, three holes 82c are arranged at a predetermined interval (for example, at 5 degree intervals with respect to the circumference centered on the rotation axis of the partition plate 91). According to such a structure, by changing the height position of the engaging protrusion 92c, the inclination angle of the partition plate 91 in the direction from the radiator 61 to the vent can be easily changed. In addition, the inclination angle of the partition plate 91 is set larger than the inclination angle of the lower plate portion 83.

[0072] In the exhaust passage 80, by setting a partition plate 91, as shown in FIG. Figure 6 As shown, the exhaust flow path of the air is separated into a first flow path 93 on the lower side of the partition plate 91 and a second flow path 94 on the upper side of 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.

[0073] Furthermore, by providing the partition plate 91 to be inclined upward in the direction toward the vent, the flow path cross-sectional area of ​​the first flow path 93 gradually increases toward the vent, and the flow path cross-sectional area of ​​the second flow path 94 gradually decreases toward the vent.

[0074] In the present embodiment, the engagement heights of the engagement projections 92 a and 92 b of the partition plate 91 are set so that the opening area of ​​the second flow path 94 on the heat sink 61 side is larger than the opening area of ​​the first flow path 93 on the heat sink 61 side.

[0075] In the structure provided with the exhaust passage 80 as described above, a substantially rectangular outlet opening is formed as an outlet opening of the exhaust air by the outer edges of the upper plate 81, the front side plate 82, the lower plate 83, and the support plate 69. The outlet opening is blocked by the right cover 14 having a vent. A sealing member (not shown) made of rubber or the like is provided along the edge of the opening, and the right cover 14 is in close contact with the outlet opening via the sealing member.

[0076] In the excavator 1 having the exhaust duct 80 structured as described above, the cooling fan 65 rotates to cool the exhaust duct 80. Figure 6 As shown by the hollow arrow in the figure, air is sent toward the radiator 61. The air passing between the multiple fins of the radiator 61 absorbs the heat of the radiator 61, becomes a flow of hot air, passes through the exhaust duct 80, and is mainly discharged to the outside of the body from the upper and lower openings 72a, 72b in which the grille 74 is embedded.

[0077] In the exhaust duct 80, the second flow path 94 on the upper side of the partition plate 91 has a smaller flow path cross-sectional area at the right cover 14 side, which is the air outlet, than the flow path cross-sectional area at the radiator 61 side, which is the air inlet. Therefore, the flow velocity of the exhaust air increases toward the outlet. In addition, the amount of air moving in the exhaust duct 80 per unit time [air volume Q (m 3 / min)] According to Q = V × A × 60 [V is the wind speed in the channel (m / s), A is the flow path cross-sectional area of ​​the channel (m 2 )] is obtained. Thus, when the amount of air moved by the cooling fan 65 rotating at a predetermined speed is constant and half of the air volume passes through the first flow path 93 and the second flow path 94 respectively, the wind speed of the air discharged to the outside of the machine body from the second flow path 94 whose flow path cross-sectional area becomes smaller on the vent side becomes higher, and the wind speed of the air discharged to the outside of the machine body from the first flow path 93 whose flow path cross-sectional area becomes larger on the vent side becomes lower. That is, by such an inclined configuration of the partition plate 91, the flow of the air discharged from the second flow path 94 is faster than the flow of the air discharged from the first flow path 93.

[0078] The flow of the air exhausted from the second flow path 94 is faster than the flow of the air exhausted from the first flow path 93, so that the air exhausted from the first flow path 93 is as follows: Figure 6 As shown, the air discharged from the second flow path is sucked by the flow rate of the air discharged from the second flow path, and flows upward in a manner of merging with the flow of the air from the second flow path 94. That is, the flow of the air discharged from the first flow path 93 is formed toward the flow of the air discharged from the second flow path 94. Therefore, the exhaust air discharged outside the machine body can be efficiently guided upward.

[0079] By slanting the partition plate 91 in the exhaust duct 80, the exhaust air from the machine body is guided upward rather than horizontally, so that during operation with the aid of the excavator 1, the hot exhaust air will not be blown directly onto the shrubs and roadside trees and / or the flowers and plants in the flower bed at the same height as the opening 72b on the lower side of the right cover 14, thereby preventing these plants from withering due to the heat.

[0080] In addition, in the present embodiment, the front side plate 82 is configured so that its plate surface is substantially perpendicular to the air outlet surface of the radiator 61. However, in order to make the exhaust air blow out further to the rear of the machine body, the front side plate 82 may be configured to be inclined at an acute angle relative to the air outlet surface of the radiator 61 when viewed from above. In this case, of course, the shape of the partition plate 91 is also deformed according to the inclination of the front side plate 82 of the exhaust duct 80.

[0081] The excavator 1 of the present embodiment having the above-described structure can be said to have the following structure. That is, the excavator 1 is an operating machine in which a vent (openings 72a, 72b, slit 73) communicating with the engine room 11 is provided on the outer cover (right cover 14), wherein a partition plate 91 for separating the exhaust flow path (exhaust passage 80) of air from top to bottom is arranged to be inclined upward from the inside of the engine room 11 toward the vent between the heat exchanger (heat exchange unit 60, radiator 61, oil cooler 62) arranged at a position opposite to the vent (openings 72a, 72b, slit 73) and the outer cover (right cover 14) provided with the vent.

[0082] According to the excavator 1 involved in this embodiment, by arranging the partition plate 91 to tilt upward from the inside of the engine room 11 toward the vent, the exhaust flow path of the air from the engine room 11 is separated from the upper and lower parts, and the exhaust air from the lower flow path is drawn into the exhaust air from the upper flow path, so that the exhaust air can be guided upward. In this way, by guiding the flow of air from the engine room toward the vent upward, the air discharged from the vent to the outside of the machine body can be discharged from the vent as an upward airflow, and the exhaust air of the engine, etc. discharged from the engine room can be prevented from blowing to the trees, etc. around the excavator 1 in the excavation operation. In addition, it is also possible to prevent the exhaust air from blowing to the operator, pedestrians, etc. passing by the side of the excavator 1.

[0083] In addition, in the excavator 1, the partition plate 91 separates the exhaust flow path (exhaust passage 80) into a first flow path 93 and a second flow path 94, the first flow path 93 is on the lower side of the partition plate 91 and the flow path cross-sectional area gradually increases from the radiator 61 side toward the vent, and the second flow path 94 is on the upper side of the partition plate 91 and gradually decreases from the radiator 61 side toward the vent. In other words, the partition plate 91 is configured so that the flow of air exhausted from the second flow path 94 on the upper side of the partition plate 91 is faster than the flow of air exhausted from the first flow path 93 on the lower side of the partition plate 91. In addition, in the excavator 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.

[0084] According to the excavator 1 of such a structure, in the second flow path 94 formed in the exhaust flow path (exhaust passage 80), due to the configuration of the partition plate 91, for the flow of air from the engine room 11 toward the vent, the outlet on the vent side is narrower than the inlet of the second flow path 94 on the engine room 11 side, so the flow rate of the exhaust air becomes faster on the outlet side of the air. That is, the flow of the air in the second flow path 94, whose flow path cross-sectional area gradually decreases toward the vent, is faster than the flow of the first flow path 93, whose flow path cross-sectional area gradually increases toward the vent. Therefore, the flow of the air discharged from the first flow path 93, which has a slower flow rate than the flow of the air discharged from the second flow path 94, is sucked by the flow of the air discharged from the second flow path 94. In this way, the exhaust air of the first flow path 93 below is easily drawn into the exhaust air from the second flow path 94 above, so that the exhaust air can be guided upward more efficiently.

[0085] In the excavator 1 , the flow path cross-sectional area of ​​the second flow path 94 on the heat exchanger side is larger than the flow path cross-sectional area of ​​the first flow path 93 on the heat exchanger (heat exchange unit 60 , radiator 61 , oil cooler 62 ) side.

[0086] According to the excavator 1 of such a structure, the amount of air exhausted from the second flow path 94 on the upper side of the partition plate 91 is greater than the amount of air exhausted from the first flow path 93. That is, the exhaust air from the first flow path 93 can be reduced. In addition, the air inlet of the second flow path 94 becomes larger, so the speed of the exhaust air exhausted from the second flow path 94 can be further increased. Therefore, it is easy to draw the exhaust air from the first flow path 93 below into the exhaust air from the second flow path 94 above, and the exhaust air can be guided upward more efficiently.

[0087] In addition, in the excavator 1 , the lower plate portion 83 , which is the lower surface portion forming the first flow path 93 , is disposed below the partition plate 91 so as to be inclined upward toward the ventilating port.

[0088] According to the excavator 1 of such a structure, the flow of air exhausted from the first flow path 93 can be further guided upward by the lower plate 83. In addition, in the present embodiment, the battery 54 is arranged below the exhaust flow path (exhaust passage 80), so the lower plate 83 can be replaced by studying the shape of the battery cover 55 covering the upper surface of the battery 54, for example.

[0089] Furthermore, in the excavator 1 , the partition plate 91 is provided so that the inclination angle can be changed.

[0090] According to the excavator 1 of such a structure, the inclination angle of the partition plate 91 can be appropriately changed according to the specifications of the excavator 1 and the arrangement of the equipment on the revolving frame 7. Thus, the exhaust direction of the exhaust air from each exhaust flow path on the upper side and the lower side of the partition plate 91 can be easily adjusted according to the specifications (size) of the excavator 1.

[0091] In addition, regarding the structure for changing the inclination angle of the partition plate 91, in the present embodiment, by providing three holes 82c as a structure of multiple holes for angle adjustment, the inclination angle of the partition plate 91 can be changed in three levels: upper, middle, and lower. In addition, the number of holes 82c is not limited. In addition, for the hole portions 82c (hole portions 82c in an open state) that are not used for supporting the partition plate 91 among the multiple holes 82c, for example, it is preferred to use a clamp such as a tree clamp (Japanese: ツリークリップ), a screw, etc. as a blocking member to block the hole portion 82c. By blocking the hole portion 82c with the blocking member, it is possible to suppress the air that flows into the exhaust duct 80 through the rotating cooling fan 65 from leaking to the inner side of the body through the hole portion 82c, and the cooling effect generated by the cooling fan 65 can be maintained.

[0092] The partition plate 91 is pivotally mounted on a support member (front side plate portion 82, support plate 69) forming a side wall of the discharge flow path, and has a fixing portion (engaging protrusion 92c) for fixing the partition plate 91 relative to the inclination of the support member.

[0093] According to the excavator 1 having such a structure, the direction of exhaust air can be easily adjusted by changing the inclination angle of the partition plate 91 and the partition plate 91 can be easily fixed. In addition, even a small excavator 1 can be easily provided with the partition plate 91.

[0094] The description of the above-mentioned embodiment is an example of the present invention, and the working machine involved in the present invention is not limited to the above-mentioned embodiment. Therefore, even outside the above-mentioned embodiment, various changes can be made according to the design, etc. as long as they do not deviate from the scope of the technical idea involved in the present invention. In addition, the effects described in the present disclosure are only illustrative and not restrictive, and other effects may also be present.

[0095] Furthermore, the present invention can take the following aspects. (1)

[0097] A working machine has a ventilating port connected to an engine room provided on an outer cover, wherein:

[0098] An air exhaust passage is formed between a heat exchanger disposed at a position opposite to the vent and a cover provided with the vent, and a partition plate separating the exhaust passage from top to bottom is disposed in the exhaust passage to be inclined upward from the inside of the engine room toward the vent. (2)

[0100] The working machine according to (1) above, wherein:

[0101] The partition plate separates the exhaust flow path into a first flow path and a second flow path. The first flow path is on the lower side of the partition plate and the flow path cross-sectional area gradually increases from the inner side of the engine room toward the vent. The second flow path is on the upper side of the partition plate and the flow path cross-sectional area gradually decreases from the inner side of the engine room toward the vent. (3)

[0103] The working machine according to (2) above, wherein:

[0104] 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. (4)

[0106] The working machine according to (2) or (3) above, wherein:

[0107] The second flow path is configured so that a flow of air is faster than a flow of air exhausted from the first flow path. (5)

[0109] The working machine according to any one of (2) to (4) above, wherein:

[0110] The first flow path is configured to form a flow of the air exhausted from the first flow path toward a flow of the air exhausted from the second flow path. (6)

[0112] The working machine according to any one of (2) to (5) above, wherein:

[0113] The lower surface portion of the lower surface forming the first flow path is arranged below the partition plate so as to be inclined upward toward the vent. (7)

[0115] The working machine according to any one of (1) to (6) above, wherein:

[0116] The partition plate is provided so that an inclination angle can be changed. (8)

[0118] The working machine according to (7) above, wherein:

[0119] The partition plate is pivotally mounted on a support member forming a side wall of the discharge flow path, and includes a fixing portion for fixing the partition plate at an inclination relative to the support member.

Claims

1. A working machine, wherein a ventilating port communicating with an engine room is provided on an outer cover, wherein: An air exhaust passage is formed between a heat exchanger disposed at a position opposite to the vent and a cover provided with the vent, and a partition plate that separates the exhaust passage into upper and lower parts is disposed in the exhaust passage so as to be inclined upward from the inner side of the engine room toward the vent.

2. The working machine according to claim 1, characterized in that: The partition plate separates the exhaust flow path into a first flow path and a second flow path, wherein the first flow path is located at the lower side of the partition plate and the flow path cross-sectional area increases from the inner side of the engine room toward the vent, and the second flow path is located at the upper side of the partition plate and the flow path cross-sectional area decreases from the inner side of the engine room toward the vent.

3. The working machine according to claim 2, characterized in that: 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.

4. The working machine according to claim 3, characterized in that: The second flow path is configured so that a flow of air is faster than a flow of air exhausted from the first flow path.

5. The working machine according to claim 4, characterized in that: The first flow path is configured to form a flow of the air exhausted from the first flow path toward the flow of the air exhausted from the second flow path.

6. The working machine according to claim 2, characterized in that: The lower surface portion of the lower surface forming the first flow path is arranged below the partition plate so as to be inclined upward toward the vent.

7. The working machine according to any one of claims 1 to 6, characterized in that: The partition plate is configured to be able to change its inclination angle.

8. The working machine according to claim 7, characterized in that: The partition plate is pivotally mounted on a support member forming a side wall of the discharge flow path, and includes a fixing portion for fixing the partition plate at an inclination relative to the support member.

9. The working machine according to claim 1, characterized in that: A hydraulic oil tank is disposed on the side of the discharge flow path, and the discharge flow path is disposed so as to be isolated from the hydraulic oil tank.

10. The working machine according to claim 9, characterized in that: The side surface of the discharge flow passage faces the hydraulic oil tank. The partition plate is formed along the side surface.

11. A working machine, wherein a ventilating port communicating with an engine room is provided on an outer cover, wherein: The air is discharged from the working machine body through the vents in a manner that the air is separated into upper and lower parts.

12. The working machine according to claim 11, characterized in that: The vent is formed by an upper opening at the top and a lower opening at the bottom. The area of ​​the upper opening is smaller than the area of ​​the opening.

13. A working machine, characterized in that: The invention comprises: a discharge flow path communicating with the vent hole, and a partition plate partitioning the discharge flow path into upper and lower parts.

14. The working machine according to claim 13, characterized in that: The partition plate is inclined upward toward the vent.

15. The working machine according to claim 14, characterized in that: The discharge flow path includes a first flow path communicating with the lower opening and having the partition plate as an upper surface, and a second flow path communicating with the upper opening and having the partition plate as a lower surface.

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