Construction machinery

Abstract

This prevents foreign matter from accumulating around the exhaust port formed in the outer cover. [Solution] The hydraulic excavator 1 comprises an outer cover 12 that covers a machine room 11 in which an engine 8 is located, an exhaust port 19 provided on the outer cover 12 for discharging air from inside the machine room 11 to the outside, and a muffler 20 that protrudes above the outer cover 12 and discharges gas (exhaust from the engine 8) discharged from the engine 8 to the outside of the machine room 11 through an open end 20A. The outer cover 12 is provided with an exhaust port cover 23 adjacent to the muffler 20 that covers the exhaust port 19, and the exhaust port cover 23 is positioned in the direction of discharge of the exhaust from the engine 8 that is discharged through the open end 20A of the muffler 20.

Description

Technical Field

[0001] The present disclosure relates to construction machinery such as a hydraulic excavator equipped with an engine.

Background Art

[0002] A hydraulic excavator, which is representative of construction machinery, includes a self-propelled lower traveling body, an upper revolving body that is rotatably provided on the lower traveling body, and a working device provided on the front side of the upper revolving body. An engine is mounted on the upper revolving body, and a hydraulic pump is driven by the engine. Thus, pressure oil for operation is supplied from the hydraulic pump to various hydraulic actuators mounted on the hydraulic excavator, and the hydraulic excavator operates. A muffler for discharging the exhaust of the engine to the outside of the vehicle body is attached to the upper revolving body of the hydraulic excavator.

[0003] The hydraulic excavator is applied to various operations by exchanging an attachment attached to the tip of the working device, such as tree felling operations at forestry sites and industrial waste treatment operations. At forestry sites and industrial waste treatment sites, a large amount of foreign matter such as dead leaves, tree branches, and dust always occurs, and this foreign matter adheres to the surface of the vehicle body of the hydraulic excavator, the surface of the muffler, etc. Since the muffler becomes hot during the operation of the hydraulic excavator, it is necessary to quickly remove the foreign matter adhering to the surface of the muffler.

[0004] On the other hand, a hydraulic excavator has been proposed in which an exhaust port is provided in an exterior cover that covers a machine room in which an engine and the like are arranged. During the operation of this hydraulic excavator, the air (hot air) in the machine room heated by the engine and the like can be discharged to the outside through the exhaust port. According to this hydraulic excavator, the foreign matter adhering to the muffler can be removed by using the air discharged to the outside through the exhaust port of the exterior cover (Patent Document 1).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] However, in the hydraulic excavator described in Patent Document 1, if foreign matter adheres to or accumulates around the exhaust port formed in the outer cover, the exhaust port can become blocked by the foreign matter. As a result, it becomes difficult for hot air inside the machine room to be discharged to the outside through the exhaust port, and the heat exchangers and other components used to cool the engine and other mounted equipment inside the machine room overheat, causing serious damage to the equipment.

[0007] This invention has been made in view of the problems of the prior art described above, and the object of this invention is to provide a construction machine that can prevent foreign matter from accumulating around an exhaust port formed in the outer cover. [Means for solving the problem]

[0008] The present invention relates to a construction machine comprising: a vehicle body on which an engine is mounted; an exterior cover provided on the vehicle body that covers a machine room in which the engine is located; an exhaust port provided on the exterior cover for discharging air from the machine room to the outside; and a muffler that protrudes above the exterior cover and discharges gas discharged from the engine to the outside of the machine room through its open end, wherein the exterior cover is provided with an exhaust port cover adjacent to the muffler that covers the exhaust port, and the exhaust port cover is positioned in the direction of discharge of the gas discharged through the open end of the muffler. [Effects of the Invention]

[0009] According to the present invention, by covering the exhaust port with an exhaust port cover and removing any foreign matter adhering to the exhaust port cover with gas (engine exhaust) discharged from the muffler, it is possible to prevent foreign matter from accumulating around the exhaust port. [Brief explanation of the drawing]

[0010] [Figure 1] This is a right side view showing a hydraulic excavator according to an embodiment of the present invention. [Figure 2] This is a perspective view of a hydraulic excavator from the right rear. [Figure 3] This is a plan view of the upper rotating body as seen from above. [Figure 4] This is a magnified plan view of the upper right side cover, muffler, exhaust port cover, etc., shown in Figure 3. [Figure 5] This is an exploded perspective view showing the upper right side cover and exhaust vent cover. [Figure 6] This is a perspective view showing the exhaust vent cover fixed to the upper right side cover. [Figure 7] This is a cross-sectional view taken from the direction indicated by arrow VII-VII in Figure 3, schematically showing the flow of cooling air inside the machine room. [Figure 8] The arrows in Figure 4 show the upper right side cover, muffler, exhaust port cover, etc., viewed from the direction indicated by arrow VIII-VIII. [Figure 9] The arrow in Figure 4 shows the upper right side cover, muffler, exhaust port cover, work light, surveillance camera, etc., viewed from the direction indicated by arrow IX-IX. [Modes for carrying out the invention]

[0011] Hereinafter, embodiments of the present invention will be described in detail, using a hydraulic excavator as an example, with reference to Figures 1 to 9. In these embodiments, the direction of travel of the hydraulic excavator will be described as the front-rear direction, and the direction perpendicular to the direction of travel will be described as the left-right direction.

[0012] A hydraulic excavator 1, a representative construction machine, is equipped with a self-propelled lower vehicle 2 and an upper slewing vehicle 3 that is rotatably mounted on the lower vehicle 2. The lower vehicle 2 and the upper slewing vehicle 3 constitute the vehicle body. The lower vehicle 2 has crawlers (tracks) on both sides, allowing it to travel stably on unpaved work sites. A working device 4 is rotatably mounted on the front of the upper slewing vehicle 3, and excavation work such as soil digging is performed using the working device 4.

[0013] The upper revolving body 3 has a revolving frame 5 as a base. The revolving frame 5 is rotatably attached to the lower traveling body 2 and is equipped with various mounted devices such as an engine 8, a hydraulic pump 9, and a heat exchanger 10 (see Fig. 7). A working device 4 is rotatably attached to the front end side of the revolving frame 5, and a counterweight 6 for balancing the weight with the working device 4 is attached to the rear end of the revolving frame 5.

[0014] As shown in Fig. 2, the counterweight 6 has a base weight portion 6A, a left weight portion 6B protruding upward from the left side of the base weight portion 6A, and a right weight portion 6C protruding upward from the right side of the base weight portion 6A, and is integrally formed as, for example, a casting. The base weight portion 6A has a height dimension lower than that of the left weight portion 6B and the right weight portion 6C and extends in the left-right direction. The base weight portion 6A is attached to the rear end portion of the revolving frame 5 using a plurality of bolts.

[0015] The cab 7 is arranged on the front left side of the revolving frame 5 and forms a driver's cab for the operator to get on and off. Inside the cab 7, a driver's seat for the operator to sit on, a travel lever and pedal device operated by the operator, an operation lever device, etc. (none of which are shown) are arranged.

[0016] The engine 8 is located in front of the counterweight 6 and is mounted on the revolving frame 5. As shown in Fig. 7, the engine 8 is attached to the revolving frame 5 in a horizontally placed state with its crankshaft extending in the left-right direction. A hydraulic pump 9 is attached to the right side of the engine 8, and the hydraulic pump 9 is driven by the engine 8 to supply hydraulic oil for operation to various hydraulic actuators mounted on the hydraulic excavator 1. A heat exchanger 10 is arranged on the left side of the engine 8. The heat exchanger 10 includes a radiator for cooling the engine cooling water, an oil cooler for cooling the hydraulic oil, etc. These mounted devices such as the engine 8, the hydraulic pump 9, and the heat exchanger 10 are arranged in a machine room 11 covered by an exterior cover 12.

[0017] The exterior cover 12 is located on the front side of the counterweight 6 and is provided on the swing frame 5. The exterior cover 12 covers the machine room 11 where the mounted devices such as the engine 8, the hydraulic pump 9, and the heat exchanger 10 are arranged. As shown in FIGS. 2 and 3, the exterior cover 12 is composed of an engine cover 13, a left rear cover 14, a right rear cover 15, a left upper cover 16, a right upper cover 17, a right front cover 18, etc.

[0018] The engine cover 13 is arranged between the left weight portion 6B and the right weight portion 6C of the counterweight 6 and mainly covers the engine 8 in an openable and closable manner. The engine cover 13 is bent in an L-shaped cross section and has a rear cover portion extending vertically between the left weight portion 6B and the right weight portion 6C, and an upper cover portion extending forward from the upper end of the rear cover portion. The engine cover 13 is attached to, for example, a support member provided on the swing frame 5 via a hinge mechanism (both not shown) and rotates around the hinge mechanism. Thereby, the engine cover 13 covers the engine 8 from the rear and above.

[0019] The left rear cover 14 is arranged adjacent to the left side of the counterweight 6 and covers the machine room 11 from the left rear side. The left rear cover 14 extends vertically along the base weight portion 6A and the left weight portion 6B of the counterweight 6. The left rear cover 14 is attached to, for example, a support member provided on the swing frame 5 via a hinge mechanism (both not shown) and rotates around the hinge mechanism to cover the machine room 11 from the left rear side in an openable and closable manner. The upper end surface of the left rear cover 14 is arranged at the same height position as the upper end surface of the left weight portion 6B.

[0020] A vent 14A is provided in the left rear cover 14. As shown in Figure 7, when the engine 8 is operating, the cooling fan 8A rotates, introducing outside air (cooling air) into the machine room 11, which is covered by the outer cover 12, through the vent 14A. This cooling air is supplied to the heat exchanger 10, engine 8, hydraulic pump 9, etc., as indicated by arrow F in Figure 7, and is then discharged to the outside of the machine room 11 through the exhaust port 19 of the upper right front cover 17, which will be described later. In this way, the cooling air circulates within the machine room 11, cooling the engine cooling water, hydraulic oil, etc., by the heat exchanger 10, and discharging the hot air inside the machine room 11 to the outside.

[0021] The right rear cover 15 is positioned adjacent to the right side of the counterweight 6 and covers the machine room 11 from the right rear. The right rear cover 15 extends vertically along the base weight portion 6A and the right weight portion 6C of the counterweight 6. The right rear cover 15 is attached to a support member provided on, for example, the slewing frame 5 via a hinge mechanism (neither of which is shown), and by rotating around the hinge mechanism, it covers the machine room 11 so that it can be opened and closed from the right rear. The upper end surface of the right rear cover 15 is positioned at the same height as the upper end surface of the right weight portion 6C.

[0022] The left upper cover 16 is positioned adjacent to the left side of the upper end surface of the engine cover 13. The left upper cover 16 is formed as a flat plate extending horizontally and covers the machine room 11 from the upper left while being positioned in the same plane as the upper end surface of the left rear cover 14 and the upper end surface of the engine cover 13.

[0023] The upper right side cover 17 is positioned adjacent to the right side of the upper end surface of the engine cover 13. The upper right side cover 17 covers the machine room 11 from the upper right. As shown in Figures 4 and 5, the upper right side cover 17 has a left flat surface 17A located on the left side in the longitudinal direction (left-right direction), a right flat surface 17B located on the right side in the longitudinal direction, and an intermediate inclined surface 17C located between the left flat surface 17A and the right flat surface 17B. The left flat surface 17A is located in the same plane as the upper end surface of the engine cover 13. The right flat surface 17B is located at a lower position than the left flat surface 17A and is located in the same plane as the upper end surface of the right front cover 18, which will be described later. The intermediate inclined surface 17C is inclined diagonally downward from the right end of the left flat surface 17A to the left end of the right flat surface 17B.

[0024] The right front cover 18 is positioned adjacent to the front of the right rear cover 15 and the right upper surface cover 17, and faces the cab 7 in the left-right direction with the working device 4 in between. The right front cover 18 houses a fuel tank and a hydraulic oil tank, etc. (neither of which are shown). The upper end surface of the right front cover 18 is in the same plane as the right flat surface 17B of the right upper surface cover 17.

[0025] The exhaust port 19 is located on the upper right side cover 17 of the outer cover 12, connecting the machine room 11 to the outside. The exhaust port 19 is composed of a total of four rectangular holes, two each formed on the right flat surface 17B and the intermediate inclined surface 17C of the upper right side cover 17 (see Figure 5). When the cooling fan 8A rotates during engine operation, outside air flows into the machine room 11 through the vent 14A of the left rear cover 14. This outside air becomes cooling air, passes through the heat exchanger 10, etc., and is then discharged to the outside through the exhaust port 19. A dustproof net 19A is attached to the exhaust port 19 to prevent foreign matter such as fallen leaves and branches generated during logging operations in forestry sites from entering the machine room 11 through the exhaust port 19.

[0026] A cylindrical muffler 20, which protrudes upward from the outer cover 12, is positioned on the front side of the upper right cover 17. The muffler 20 is located at the downstream end of the exhaust pipe through which the exhaust from the engine 8 flows, and discharges the exhaust from the engine 8 to the outside of the machine room 11 while reducing exhaust noise. As shown in Figure 4, the open end 20A of the muffler 20 that discharges the exhaust from the engine 8 is inclined to the right with respect to the front-rear direction, and the exhaust from the engine 8 is guided by the muffler 20 and discharged over the upper right cover 17 in the direction of arrow A, that is, to the right rear of the upper rotating body 3.

[0027] On the right end of the right front cover 18, which is adjacent to the front of the upper right front cover 17, are the electrical components: a surveillance camera 21 and a work light 22. These surveillance camera 21 and work light 22 are mounted side by side in the front-to-back direction on the right front cover 18 and are positioned in front of the exhaust port 19 of the upper right front cover 17. The surveillance camera 21 captures an image of the right side of the upper rotating body 3 and displays this image on a monitor (not shown) inside the cab 7. The work light 22 illuminates the right side of the upper rotating body 3 during nighttime work, etc. Here, the surveillance camera 21 and work light 22 are positioned outside the range of the exhaust discharged from the muffler 20. In addition, a surveillance camera 21 and a work light 22 are also positioned side by side in the front-to-back direction on the left end of the left rear cover 14.

[0028] Next, the exhaust port cover 23 used in this embodiment will be described.

[0029] The exhaust port cover 23 is provided on the exterior cover 12 adjacent to the right rear side of the opening end 20A of the muffler 20. Specifically, the exhaust port cover 23 is fixed to the upper right surface cover 17 of the exterior cover 12, covering the exhaust port 19 from above. As shown in Figures 5 and 6, the exhaust port cover 23 is formed using, for example, a steel plate, and has an upper surface 23A, a front surface 23B, and a rear leg portion 23C. The exhaust port cover 23 is positioned in the direction of exhaust discharge of the engine 8 discharged through the opening end 20A of the muffler 20.

[0030] The upper surface 23A of the exhaust port cover 23 is formed as a flat plate with a nearly triangular shape when viewed from above, and has a left edge 23D, a front edge 23E, and a right edge 23F. The left edge 23D of the upper surface 23A faces the open end 20A of the muffler 20 in the direction of exhaust discharge of the engine 8 discharged from the muffler 20 (direction of arrow A in Figure 4). The left edge 23D of the upper surface 23A abuts against the intermediate inclined surface 17C of the upper right upper surface cover 17 and is welded to its surface.

[0031] The front surface 23B of the exhaust port cover 23 extends downward from the front edge 23E of the upper surface 23A. The front surface 23B faces the open end 20A of the muffler 20 in the direction of exhaust discharge (direction of arrow A) from the muffler 20. The lower end of the front surface 23B abuts against the right flat surface 17B and the intermediate inclined surface 17C of the upper right cover 17, and is welded to the surfaces of these right flat surface 17B and intermediate inclined surface 17C.

[0032] The rear leg portion 23C extends downward from the middle of the right edge 23F in the longitudinal direction of the upper surface 23A. The width dimension of the rear leg portion 23C is set to be smaller than the length dimension of the right edge 23F of the upper surface 23A. The lower end of the rear leg portion 23C abuts against the boundary between the right flat surface 17B and the intermediate inclined surface 17C of the upper right surface cover 17 and is welded to this boundary. The exhaust port cover 23 maintains the width of the opening 26, which will be described later, formed between it and the upper right surface cover 17 by the rear leg portion 23C.

[0033] Thus, the welded joint between the left edge 23D of the exhaust port cover 23 (upper surface 23A) and the intermediate inclined surface 17C of the upper right surface cover 17 faces the open end 20A of the muffler 20 and forms a left-side partition 24 that separates the exhaust port cover 23 and the upper right surface cover 17 from the exhaust discharged from the open end 20A. Furthermore, the welded joint between the front surface 23B of the exhaust port cover 23 and the right-side flat surface 17B and intermediate inclined surface 17C of the upper right surface cover 17 faces the open end 20A of the muffler 20 and forms a front-side partition 25 that separates the exhaust port cover 23 and the upper right surface cover 17 from the exhaust discharged from the open end 20A. Here, the front-side partition 25 faces the electrical components, the surveillance camera 21 and the work light 22, in the front-rear direction.

[0034] On the other hand, the right edge 23F of the exhaust port cover 23 (upper surface 23A) is located on the opposite side from the opening end 20A of the muffler 20, with the left partition 24 and the front partition 25 in between. The portion of the right edge 23F excluding the rear leg portion 23C forms an opening 26 that separates the exhaust port cover 23 from the upper right cover 17. Therefore, the air (hot air) inside the machine room 11 that is discharged to the outside of the outer cover 12 through the exhaust port 19 does not pass through the left partition 24 and the front partition 25, but is discharged through the opening 26 to the right rear of the upper rotating body 3, in the same direction as the exhaust discharge from the muffler 20 (direction of arrow A).

[0035] In this way, the front partition portion 25 of the exhaust port cover 23 shields electrical components such as the work light 22 and surveillance camera 21, which are located in front of the exhaust port cover 23, from the hot air discharged from the exhaust port 19. As a result, even if the air inside the machine room 11 is heated when the hydraulic excavator 1 is in operation and hot air is discharged from the exhaust port 19, the electrical components are prevented from being exposed to the hot air, and their lifespan can be extended.

[0036] Furthermore, the portion of the exhaust port cover 23 facing the open end 20A of the muffler 20 is divided into a left partition portion 24 and a front partition portion 25, which close off the space between it and the upper right side cover 17. As a result, exhaust gas from the engine 8 discharged from the muffler 20 does not flow between the exhaust port cover 23 and the upper right side cover 17, thereby preventing exhaust gas from flowing into the machine room 11 from the exhaust port 19.

[0037] Furthermore, the left edge 23D of the exhaust port cover 23 is welded to the intermediate inclined surface 17C of the upper right surface cover 17 at a higher position than the right edge 23F. As a result, the upper surface 23A of the exhaust port cover 23 is gently inclined downward from the left edge 23D to the right edge 23F. That is, the upper surface 23A is inclined downward toward the outside of the upper rotating body 3 with respect to the horizontal direction. By making the upper surface 23A of the exhaust port cover 23 an inclined surface that is inclined downward toward the outside of the upper rotating body 3 with respect to the horizontal direction, it is possible to prevent rain, washing water, etc. from remaining on the exhaust port cover 23, and the structure is designed to prevent the accumulation of foreign matter such as fallen leaves and dust.

[0038] The hydraulic excavator 1 according to this embodiment has the configuration described above. When using the hydraulic excavator 1 to perform excavation work on earth and sand, the operator boards the cab 7 and operates the engine 8, which supplies pressurized oil discharged from the hydraulic pump 9 to various hydraulic actuators. In this state, the operator can move the hydraulic excavator 1 toward the work site by operating the travel lever and pedal device, and can perform excavation work using the work device 4 while rotating the upper slewing body 3 by operating the control lever device.

[0039] When the engine 8 is operating, the cooling fan 8A rotates, drawing outside air into the machine room 11, which is covered by the outer cover 12, through the vent 14A of the left rear cover 14, etc. The outside air introduced into the machine room 11 becomes cooling air and passes through the heat exchanger 10, engine 8, hydraulic pump 9, etc., before becoming hot air and being discharged to the outside of the machine room 11 through the exhaust port 19 of the upper right side cover 17, etc. The heat exchanger 10 cools the engine coolant with a radiator and cools the hydraulic oil with an oil cooler.

[0040] For example, when performing tree felling work using a hydraulic excavator 1 in a forestry site, a large amount of foreign matter such as dead leaves, branches, and dust is generated. If this foreign matter adheres to and accumulates on the surface of the upper right cover 17 in which the exhaust port 19 is formed, the exhaust port 19 will be blocked by the foreign matter. In this case, the hot air inside the machine room 11 will have difficulty being discharged to the outside through the exhaust port 19, and the heat exchanger 10 and other components may overheat, potentially damaging the onboard equipment such as the engine 8 and hydraulic pump 9.

[0041] In contrast, the hydraulic excavator 1 according to this embodiment is provided with an exhaust port cover 23 adjacent to the muffler 20 on the upper right surface cover 17, which covers the exhaust port 19, and the exhaust port cover 23 is positioned opposite the open end 20A of the muffler 20. This prevents foreign matter from accumulating around the exhaust port 19 with the exhaust port cover 23, and foreign matter adhering to the exhaust port cover 23 can be removed using the exhaust discharged from the open end 20A of the muffler 20. As a result, the exhaust port 19 is prevented from being blocked by foreign matter, and the hot air generated in the machine room 11 is smoothly discharged to the outside through the exhaust port 19, thereby suppressing the temperature rise inside the machine room 11 and preventing overheating of various mounted equipment located inside the machine room 11.

[0042] In this case, an opening 26 is formed between the upper right cover 17 and the exhaust port cover 23, which guides the air (hot air) that has passed through the exhaust port 19 to the outside. Therefore, the hot air inside the machine room 11 that has passed through the exhaust port 19 is not obstructed by the exhaust port cover 23 and is smoothly discharged to the outside of the outer cover 12 through the opening 26.

[0043] Furthermore, the exhaust port cover 23 has a left partition portion 24 and a front partition portion 25 that separate the upper right surface cover 17 from the exhaust port cover 23 in the area facing the open end 20A of the muffler 20, and the area on the opposite side of the muffler 20 from the open end 20A, sandwiching these left partition portion 24 and front partition portion 25, becomes an opening 26, which opens the space between the exhaust port cover 23 and the upper right surface cover 17. As a result, the exhaust from the engine 8 discharged from the muffler 20 can be prevented from flowing between the exhaust port cover 23 and the upper right surface cover 17 by the left partition portion 24 and the front partition portion 25. Consequently, the exhaust from the engine 8 discharged from the muffler 20 can be prevented from flowing into the machine room 11 through the exhaust port 19.

[0044] Furthermore, the air (hot air) inside the machine room 11 that is discharged to the outside of the outer cover 12 through the exhaust port 19 is discharged to the right rear of the upper rotating body 3 through the opening 26 without passing through the left partition 24 and the front partition 25. In this way, the front partition 25 of the exhaust port cover 23 shields electrical components such as the work light 22 and surveillance camera 21, which are located in front of the exhaust port cover 23, from the hot air discharged from the exhaust port 19. As a result, electrical components such as the work light 22 and surveillance camera 21 are prevented from being exposed to the hot air discharged from the exhaust port 19, and their lifespan can be extended.

[0045] Thus, according to the embodiment, in a hydraulic excavator 1 comprising a vehicle body on which an engine 8 is mounted, an exterior cover 12 provided on the vehicle body and covering a machine room 11 in which the engine 8 is located, an exhaust port 19 provided on the exterior cover 12 for discharging air from inside the machine room 11 to the outside, and a muffler 20 protruding above the exterior cover 12 and discharging gas (exhaust from the engine 8) discharged from the engine 8 to the outside of the machine room 11 through an open end 20A, the exterior cover 12 is provided with an exhaust port cover 23 adjacent to the muffler 20 and covering the exhaust port 19, and the exhaust port cover 23 is positioned in the direction of discharge of the exhaust from the engine 8 discharged through the open end 20A of the muffler 20.

[0046] With this configuration, the exhaust port cover 23 prevents foreign matter from accumulating around the exhaust port 19, and any foreign matter adhering to the exhaust port cover 23 can be removed using the exhaust gas discharged from the open end 20A of the muffler 20. As a result, the exhaust port 19 is prevented from being blocked by foreign matter, and the hot air generated in the machine room 11 is discharged to the outside through the exhaust port 19, thereby suppressing the temperature rise inside the machine room 11 and preventing overheating of the various mounted equipment located inside the machine room 11.

[0047] In this embodiment, the outer cover 12 has an upper right side cover 17 that covers the machine room 11 from above and is provided with an exhaust port 19. The exhaust port cover 23 is attached to the upper right side cover 17 while covering the exhaust port 19, and an opening 26 is formed between the upper right side cover 17 and the exhaust port cover 23 to guide the air that has passed through the exhaust port 19 to the outside. With this configuration, the hot air inside the machine room 11 that has passed through the exhaust port 19 can be smoothly discharged to the outside of the outer cover 12 through the opening 26 without being obstructed by the exhaust port cover 23.

[0048] In this embodiment, the exhaust port cover 23 has a left partition portion 24 and a front partition portion 25 that separate the exhaust port 19 of the upper right surface cover 17 from the open end 20A of the muffler 20, in the area facing the open end 20A of the muffler 20. Between the exhaust port cover 23 and the upper right surface cover 17, an opening 26 is formed in the area opposite to the open end 20A of the muffler 20, with the left partition portion 24 and the front partition portion 25 in between. With this configuration, the exhaust from the engine 8 discharged from the muffler 20 can be prevented from flowing between the exhaust port cover 23 and the upper right surface cover 17 by the left partition portion 24 and the front partition portion 25. As a result, it is possible to prevent the exhaust from the engine 8 discharged from the muffler 20 from flowing into the machine room 11 through the exhaust port 19.

[0049] In this embodiment, electrical components (a surveillance camera 21 and a work light 22) are positioned adjacent to the exhaust port 19 of the upper right side cover 17 on the outer cover 12, and the front partition portion 25 of the exhaust port cover 23 is provided between the electrical components and the exhaust port 19 of the upper right side cover 17. With this configuration, the front partition portion 25 shields the electrical components such as the work light 22 and surveillance camera 21, which are positioned in front of the exhaust port cover 23, from the hot air discharged from the exhaust port 19. As a result, the electrical components are prevented from being exposed to the hot air discharged from the exhaust port 19, and their lifespan can be extended.

[0050] In this embodiment, the exhaust port cover 23 has an upper surface 23A that covers the exhaust port 19 from above, and the upper surface 23A is formed as an inclined surface that slopes downward toward the outside of the upper rotating body 3 with respect to the horizontal direction. With this configuration, it is possible to prevent rain, washing water, etc. from remaining on the exhaust port cover 23, and it is possible to easily remove foreign matter such as fallen leaves and dust.

[0051] In this embodiment, an example is shown in which an exhaust port 19 is formed in the upper right surface cover 17 that constitutes the exterior cover 12, and an exhaust port cover 23 is provided to cover this exhaust port 19. However, the present invention is not limited to this, and for example, an exhaust port may be formed in the upper cover portion of the engine cover 13, and this exhaust port may be covered by an exhaust port cover.

[0052] Furthermore, although the embodiment illustrates a case where the exhaust port cover 23 is fixed to the upper right surface cover 17 by welding, the exhaust port cover may also be detachably attached using bolts or the like. [Explanation of symbols]

[0053] 2. Lower running body (vehicle body) 3. Upper rotating body (vehicle body) 8 engines 11 Machine room 12 Exterior Cover 17. Upper right side cover (top cover) 19 Exhaust vent 20 mufflers 20A open end 21. Surveillance cameras (electrical components) 22 Work lights (electrical components) 23 Exhaust vent cover 23A Top 24 Left side partition (partition) 25 Front partition section (partition section) 26 Opening

Claims

1. In a construction machine comprising: a vehicle body on which an engine is mounted; an exterior cover provided on the vehicle body that covers a machine room in which the engine is located; an exhaust port provided on the exterior cover that discharges air from the machine room to the outside; and a muffler that protrudes above the exterior cover and discharges gases discharged from the engine to the outside of the machine room through its open end, The exterior cover is provided with an exhaust port cover adjacent to the muffler and covering the exhaust port. The construction machine is characterized in that the exhaust port cover is positioned in the direction of discharge of the gas discharged through the open end of the muffler.

2. The exterior cover has an upper cover that covers the machine room from above and is provided with the exhaust port. The exhaust port cover is attached to the top cover while covering the exhaust port. The construction machine according to claim 1, characterized in that an opening is formed between the top cover and the exhaust port cover to guide the air that has passed through the exhaust port to the outside.

3. The exhaust port cover has a partition portion in the area facing the open end of the muffler that separates the exhaust port of the upper cover from the open end of the muffler. The construction machine according to claim 2, characterized in that the opening is formed between the exhaust port cover and the upper cover in a range opposite to the open end of the muffler, with the partition in between.

4. The exterior cover has electrical components arranged adjacent to the exhaust port of the top cover. The construction machine according to claim 3, characterized in that the partition portion of the exhaust port cover is provided between the electrical components and the exhaust port of the upper cover.

5. The exhaust port cover has an upper surface that covers the exhaust port from above, The construction machine according to claim 1, characterized in that the upper surface is formed as an inclined surface that slopes downward toward the outside of the vehicle body with respect to the horizontal direction.

Images