JP7847438B2 - Construction machinery - Google Patents

Description

This invention relates to construction machinery.

Patent Document 1 describes a construction machine having a diffuser that discharges exhaust gas from an engine to the outside.

Japanese Patent Publication No. 2021-143614

The conventional exhaust gas discharge structure described above had a problem in that the diffuser on the housing could become extremely hot due to the heat of the exhaust gas.

The present invention aims to prevent the outer surface of the exhaust gas discharge cover in construction machinery from becoming excessively hot.

The construction machinery according to the present invention is
Internal combustion engines and
The first exhaust port cover forms the outer enclosure of the exhaust port of the internal combustion engine and the exhaust passage,
A second exhaust port cover surrounds the outside of the first exhaust port cover,
Equipped with ,
The second exhaust port cover includes a cover exhaust port, a drain port for discharging water that has entered through the cover exhaust port, and a wall surface located below the lower end of the opening of the first exhaust port cover, which guides the exhaust coming out of the opening upward.
It has,
The drain outlet is capable of discharging water that has traveled down the wall surface .

According to this invention, the effect is obtained that the outer surface of the cover that discharges exhaust gas to the outside of construction machinery becomes less prone to high temperatures.

These are a side view (A) and a top view (B) showing a construction machine according to an embodiment of the present invention. Figure 1 shows a perspective view (A) of the exhaust port cover and a longitudinal cross-sectional view (B) of the internal structure. This is an explanatory diagram comparing the size of the exhaust vent hole and the size of the drain vent hole. Figure 2 is a separated perspective view showing the components of the exhaust port cover in separate parts. This is an explanatory diagram showing the exhaust port cover of modified example 1. This is an explanatory diagram showing the exhaust port cover of modified example 2. These are a perspective view (A) and a longitudinal section view (B) showing the exhaust port cover of the modified example 3.

The embodiments of the present invention will be described in detail below with reference to the drawings.

Figure 1 shows a side view (A) and a top view (B) of a construction machine according to an embodiment of the present invention. Figure 2 shows a perspective view (A) of the exhaust port cover of Figure 1 and a longitudinal cross-sectional view (B) of the internal structure. Figure 2(B) shows a cross-section of the exhaust port cover 20 of Figure 2(A) when cut through a vertical plane that passes through the center of the exhaust port X110 of the internal combustion engine 110 and extends in the front-rear direction.

In this specification, the Z direction is described as vertically upward, the X direction as forward, the -X direction as backward, and the ±Y directions as left-right. The X-Y direction is horizontal. The forward direction, in a plan view, is along the pipe centerline A21b (Figure 2(B)) of the exhaust outlet portion 21h of the first exhaust port cover 21, and corresponds to the direction toward the outside air from the opening 21x.

As shown in Figures 1(A) and 1(B), the construction machine 100 according to an embodiment of the present invention comprises an internal combustion engine 110, a housing 120a in which the internal combustion engine 110 is housed, and an exhaust port cover 20 positioned outside the housing 120a. The housing 120a may be the housing of a machine room 120 in which the internal combustion engine 110 is housed.

In the example shown in Figure 1, the construction machine 100 is a mobile crane comprising a lower traveling body 102, an upper slewing body 104 that rotates relative to the lower traveling body 102, a boom 106 (not shown in Figure 1(B)) that is arrangable on the upper slewing body 104, and a hook 107 that can be raised and lowered. The upper slewing body 104 is equipped with a machine room 120 housing an internal combustion engine 110, a cab 112, and a winch 114 for raising and lowering the boom 106 and the hook 107. The internal combustion engine 110 generates the driving power for the lower traveling body 102, the slewing power for the upper slewing body 104, and the rotational power for the winch 114. The internal combustion engine 110 outputs power to a hydraulic power generator, and one or more of the lower traveling body 102, upper slewing body 104, and winch 114 may be driven by the hydraulic pressure of the hydraulic power generator.

The exhaust port cover 20 is provided on the upper side of the housing 120a, as shown in Figures 2(A) and 2(B). The exhaust port cover 20 has a first exhaust port cover 21 that surrounds the outside of the exhaust port X110 of the internal combustion engine 110 and forms an exhaust passage, and a second exhaust port cover 22 that surrounds the outside of the first exhaust port cover 21. The first exhaust port cover 21 and the exhaust port X110 are separate components. A gap may be provided between the first exhaust port cover 21 and the exhaust port X110. This gap allows heat from inside the internal combustion engine 110 to be introduced to the first exhaust port cover 21 through the gap, and the heat can be released to the outside of the housing 120a.

The exhaust port X110 of the internal combustion engine 110 is the end of the exhaust pipe 111 of the internal combustion engine 110. The exhaust pipe 111 may be a muffler. The exhaust pipe 111 may be connected to the crankcase of the internal combustion engine 110. The exhaust port X110 protrudes outward from an opening 120h provided in the top plate of the housing 120a. Alternatively, the exhaust port X110 may be positioned substantially flush with the opening 120h, or it may be positioned inside the opening 120h. The exhaust port X110 faces vertically upward.

The first exhaust port cover 21 is a curved pipe having an exhaust inlet portion 21v and an exhaust outlet portion 21h, and discharges the exhaust that is discharged upward from the exhaust port X110 forward. The pipe centerline A21a of the exhaust inlet portion 21v points upward, while the pipe centerline A21b of the exhaust outlet portion 21h points forward.

The opening 21x of the first exhaust port cover 21, which serves as the exhaust outlet, is inclined such that its upper part protrudes further forward than its lower part. This inclination is steeper (closer to vertical) than the inclination of the inclined surface 221, which will be described later.

The exhaust port cover 20 has a base plate 23 that is fastened to the upper surface of the housing 120a, and the first exhaust port cover 21 is joined to the base plate 23. Specifically, the base plate 23 has an opening 23h that overlaps with the opening 120h of the housing 120a. The introduction portion 21v of the first exhaust port cover 21 and the base plate 23 are joined (e.g., by welding) so that the introduction portion 21v of the first exhaust port cover 21 and the opening 23h of the base plate 23 communicate without any gaps.

The second exhaust port cover 22 surrounds the first exhaust port cover 21 from all four sides (front, back, left, and right) and from above. The front inner surface of the second exhaust port cover 22 has an inclined surface 221 that is angled to deflect forward-directed exhaust upwards, and a vertical surface 222 that extends vertically upwards above the inclined surface 221. The vertical surface 222 corresponds to an example of a wall surface for guiding exhaust upwards. The vertical surface 222 extends along an inclination of less than 5 degrees, but the vertical surface 222 only needs to be an inner wall surface that is angled upwards. "Upwards" may refer to an inclined direction within a range of less than 45 degrees. Preferably, the vertical surface 222 is an inner wall surface that is angled vertically upwards. "Vertically upwards" may refer to an inclined direction within a range of less than 30 degrees.

The second exhaust port cover 22 has a cover exhaust port X20. The cover exhaust port X20 faces upward and is exposed upward. "Exposed upward" means that the exposed portion is visible when viewed from above, and the cover exhaust port X20 may be angled from the horizontal. The cover exhaust port X20 is located above the inclined surface 221 and adjacent to the vertical surface 222. The cover exhaust port X20 is provided with a mesh screen 224 to prevent foreign matter from entering. The mesh screen 224 has slits that allow exhaust to pass through. The slits may be replaced with a mesh.

The arrangement of the vertical plane 222 and the cover exhaust port X20 allows the exhaust from the internal combustion engine 110 to be discharged upward from the cover exhaust port X20. If the exhaust is discharged horizontally, or diagonally upward including a horizontal component, from the exhaust port cover 20, the following problems arise. For example, if the exhaust is discharged in the Y direction (towards the center of the upper rotating body 104) in Figure 1(B), the wire rope will be heated by the exhaust. If the exhaust is discharged in the X direction in Figure 1(B), there is a risk that the exhaust will enter the cab 112. If the exhaust is discharged in the -Y direction in Figure 1(B), the exhaust is more likely to flow near workers moving along the walkway 109 next to the machine room 120. If the exhaust is discharged in the -X direction in Figure 1(B), there is a risk that the exhaust will flow into the intake port of the internal combustion engine 110. In this embodiment, the above problems can be solved by discharging the exhaust upward.

A gap e is provided between the second exhaust port cover 22 and the first exhaust port cover 21 (more specifically, between the outer surface of the first exhaust port cover 21 and the inner surface of the second exhaust port cover 22). The gap e is provided in the front, back, left, right, top, and bottom portions of the first exhaust port cover 21. The second exhaust port cover 22 may not be in complete contact with the first exhaust port cover 21, or it may be in partial contact via a small area, such as the end surface of a partition plate. With this configuration, even if the first exhaust port cover 21 becomes hot due to exhaust, the conduction of heat from the first exhaust port cover 21 to the second exhaust port cover 22 can be suppressed, preventing the second exhaust port cover 22 from becoming hot.

A drain port (opening) 22z is provided at the bottom of the second exhaust port cover 22. The drain port 22z may be an opening for taking in air with low drainage function. The drain port 22z is connected to a gap e, and the drain port 22z is in communication with the cover exhaust port X20 through the gap e. With this configuration, when the exhaust gas discharged from the first exhaust port cover 21 is discharged to the outside from the cover exhaust port X20, the exhaust gas carries the gas in the gap e with it as it is discharged from the cover exhaust port X20. Therefore, when the exhaust gas is discharged, outside air flows in from the drain port 22z, and outside air flows into the gap e. Consequently, even if the first exhaust port cover 21 becomes hot due to the exhaust gas, the gap e between the first exhaust port cover 21 and the second exhaust port cover 22 is cooled by the outside air, and the second exhaust port cover 22 can be prevented from becoming hot. Having a gap e closer to the opening 21x in the X direction than the opening 21x allows for a better draw of gas from the gap e by exhaust. Therefore, it is preferable that the gap e be included at least in the X direction beyond the opening 21x.

The drain port 22z, which serves as an opening for outside air to enter, is located in front of the base of the exhaust port cover 20. The drain port 22z may be positioned in the X direction relative to the exhaust pipe 111. The drain port 22z may also be positioned in the X direction relative to the exhaust inlet portion 21v of the first exhaust port cover 21. The drain port 22z may also be located below the exhaust outlet portion 21h of the first exhaust port cover 21 in the Z direction. The drain port 22z may also be located at a height close to the top surface of the housing 120a. With this arrangement, the drain port 22z is positioned in a recessed area, reducing the risk of foreign matter entering the second exhaust port cover 22 through the drain port 22z. If drainage is not required and only outside air intake is needed, the opening may be provided at various locations on the second exhaust port cover.

A backflow prevention wall 225 (shielding portion) is provided between the first exhaust port cover 21 and the second exhaust port cover 22 to block the gap e. At least a portion of the backflow prevention wall 225 (e.g., the upper and lower parts) is provided with through holes h225a and h225b, and communication between the drain port 22z and the cover exhaust port X20 may be established through these through holes h225a and h225b. The backflow prevention wall 225 prevents, in the event of an exceptional flow in a portion of the exhaust, the exhaust from entering the base side of the exhaust port cover 20 through the gap e, thus preventing the hot exhaust from accumulating inside the exhaust port cover 20.

As described above, the second exhaust port cover 22 is provided with a drain port 22z for discharging water (rainwater, etc.) that has entered the gap e from the cover exhaust port X20. One of the through-holes h225a in the backflow prevention wall 225 is located at the lower part of the backflow prevention wall 225 and also functions as a drain port. The drain port 22z is located at the lower front of the second exhaust port cover 22. With this configuration, water that has entered from the cover exhaust port X20 can be discharged to the outside of the exhaust port cover 20 via the inclined surface 221, the through-hole h225a, and the drain port 22z.

Figure 3 is an explanatory diagram comparing the size of the exhaust vent hole and the size of the drain vent hole.

The size of the hole in the exhaust cover outlet X20 (the size of the hole in the drain cover 224) W1 is smaller than the size of the hole in the drain outlet 22z W2. Here, the size of the hole is defined as the maximum diameter of a sphere that can pass through the hole. Specifically, the hole in 22z can accommodate a sphere with a diameter of W2, and the hole in X20 can accommodate a sphere with a diameter of W1. The size of the through-hole h225a in the backflow prevention wall 225, which functions as a drain, is also larger than the size of the hole in the cover exhaust outlet X20 W1.

This configuration reduces the likelihood of foreign matter entering through the cover exhaust port X20 and clogging the drain port 22z. The size of the drain port 22z may be the same as the size of the cover exhaust port X20; even in this case, foreign matter entering through the cover exhaust port X20 is discharged through the drain port 22z, preventing it from clogging the second exhaust port cover 22. A larger drain port 22z than the cover exhaust port X20 further reduces the likelihood of foreign matter clogging the second exhaust port cover 22.

Figure 4 is a separate perspective view showing the components of the exhaust port cover.

The second exhaust port cover 22 includes multiple components (22A to 22C). Specifically, the second exhaust port cover 22 includes a frame 22A that rises from the base plate 23 and is spaced apart from the first exhaust port cover 21; a first component 22B that covers the left, right, rear, and top of the first exhaust port cover 21; and a second component 22C that connects to the first component 22B and covers the front of the first exhaust port cover 21 and the left, right, and bottom of the outlet portion 21h. The drain cover 224 is attached to the second component 22C.

The frame 22A has members a to c that stand vertically on the left, right, and rear of the base of the first exhaust port cover 21, and a front member d that stands upright in front.

The first component 22B is connected to the frame 22A such that the lower part of the first component 22B is in close contact with members a to c of the frame 22A.

The second component 22C has the aforementioned backflow prevention wall 225. Furthermore, the second component 22C has a front wall 226 with the aforementioned inclined surface 221 and vertical surface 222 (Figure 2(B)) on its front inner surface. The backflow prevention wall 225 has a through hole O225 into which the lead portion 21h of the first exhaust port cover 21 is loosely fitted. The second component 22C is connected to the first component 22B by passing the lead portion 21h of the first exhaust port cover 21 through the through hole O225 of the backflow prevention wall 225, so that the lower end surface of the front wall 226 is in close contact with the front member d of the frame 22A. Note that the backflow prevention wall 225 is connected to the second component 22C and not to the first exhaust port cover 21. However, the backflow prevention wall 225 may be connected to the first exhaust port cover 21, or it may not be connected to the second component 22C.

With this configuration, the second exhaust port cover 22 almost completely covers the perimeter of the first exhaust port cover 21, except for the cover exhaust port X20 and the drain port 22z.

The drain port 22z is provided so that a portion of the front member d of the frame 22A passes through it. As mentioned above, the drain port 22z plays the role of discharging foreign matter that has entered through the cover exhaust port X20. Therefore, the drain port 22z should be formed so that there is no step at the lower end of the drain port 22z so as not to resist the passage of foreign matter. Similarly, the through hole h225a at the bottom of the backflow prevention wall 225 should be provided so that there is no step between it and the inner surface of the second component 22C so as not to resist the passage of foreign matter.

The inclined surface 221 of the second component 22C is the part that guides water from the cover exhaust port X20 to the drain port 22z. The inclined surface 221 is located on the underside of the cover exhaust port X20 when viewed from above in the Z direction, and is visible through the opening of the cover exhaust port X20. The inclined surface 221 and its surrounding area are prone to dirt buildup due to the flow of rainwater, etc. However, with the second exhaust port cover 22 configured as described above, the second component 22C having the inclined surface 221 is removable. Furthermore, when the second component 22C is removed, it is possible to approach the inclined surface 221. Therefore, with the above configuration, the area of the second exhaust port cover 22 where rainwater flows can be easily cleaned.

(Variation 1)
Figure 5 is an explanatory diagram showing the structure of the exhaust port cover of Modified Example 1. Figure 5 shows the cross-sectional portion when the exhaust port cover 20A of Modified Example 1 is cut along a vertical plane that passes through the center of the exhaust port X110 and extends in the front-rear direction. In Modified Example 1, the same reference numerals are used for components that are the same as those in the previously described embodiment, and detailed explanations are omitted.

The exhaust port cover 20A of the modified example 1 has a removable debris collection section 25 and a drain port 22zA that guides water entering from the cover exhaust port X20 to the debris collection section 25.

The drain port 22zA is a through-hole located in the center of the left-right direction at the point where the backflow prevention wall 225 and the front wall 226 of the second exhaust port cover 22 meet. The size of the drain port 22zA is larger than the size of the cover exhaust port X20. However, the size of the drain port 22zA may be the same as the size of the cover exhaust port X20. Even in this case, the effect of preventing foreign matter entering from the cover exhaust port X20 from clogging the second exhaust port cover 22 is achieved by discharging it through the drain port 22zA. A larger drain port 22zA size than the cover exhaust port X20 size further prevents foreign matter from clogging the second exhaust port cover 22.

The waste collection section 25 may have a storage section 25a for containing foreign matter, a discharge hole 25b such as a slit or mesh provided in a part of the storage section 25a for discharging water, and a knob 25c. The storage section 25a is a box-like structure without a top panel. The discharge hole 25b is preferably provided on the side wall of the storage section 25a that is exposed to the outside (the front wall in Figure 5). The knob 25c is exposed to the outside, and it may be possible for an operator to pull out the waste collection section 25 from the second exhaust port cover 22 by pulling the knob 25c. In Figure 5, the state in which the waste collection section 25 has been pulled out is shown by a dashed line.

According to the exhaust port cover 20A of the modified example 1, foreign matter entering through the cover exhaust port X20 is guided to the debris collection section 25, preventing it from becoming clogged within the second exhaust port cover 22. Furthermore, the debris collection section 25 can be removed, allowing the accumulated foreign matter to be transferred elsewhere.

(Variation 2)
Figure 6 is an explanatory diagram showing the structure of the exhaust port cover of Modification 2, where (A) shows the adjustment window fully open and (B) shows the adjustment window closed. Figures 6(A) and 6(B) show the cross-sectional portion when the exhaust port cover 20A of Modification 2 is cut through a vertical plane that passes through the center of the exhaust port X110 and extends in the front-rear direction. In Modification 2, the same reference numerals are used for components that are the same as those in the previously described embodiment, and detailed explanations are omitted.

The exhaust port cover 20B of the modified example has a drain port 22zB for discharging water that has entered through the cover exhaust port X20, and an adjustment window 227 that allows the size of the hole in the drain port 22zB to be changed.

The drain port 22zB is a through-hole provided in the front member d of the frame 22A. The drain port 22zB is, for example, located in the center of the front member d in the left-right direction. With the adjustment window 227 fully open, the size of the drain port 22zB is larger than the size of the cover exhaust port X20. Note that the size of the drain port 22zB may be the same as the size of the cover exhaust port X20. Even in this case, the effect of preventing foreign matter entering from the cover exhaust port X20 from clogging the second exhaust port cover 22 is achieved by discharging it through the drain port 22zB. A larger drain port 22zB than the cover exhaust port X20 further prevents foreign matter from clogging the second exhaust port cover 22.

The adjustment window 227 is, for example, supported in a slidable manner, and by sliding, it blocks a portion of the drain port 22zB. Therefore, by changing the sliding position, the size of the drain port 22zB can be made smaller than the size of the cover exhaust port X20.

According to the exhaust port cover 20B of the modified example 2, if foreign matter enters through the cover exhaust port X20, the drain port 22zB can be opened wider by adjusting the adjustment window 227, thereby suppressing the accumulation of foreign matter inside the second exhaust port cover 22. Furthermore, in environments where the possibility of foreign matter entering through the cover exhaust port X20 is low, the drain port 22zB can be opened smaller by adjusting the adjustment window 227, further suppressing the backflow of exhaust into the gap e.

(Variation 3)
Figure 7 shows a perspective view (A) and a longitudinal section view (B) of the exhaust port cover of Modification 3. In Modification 3, components similar to those in the previously described embodiment are given the same reference numerals as in the embodiment, and detailed descriptions are omitted.

In the modified version 3, the exhaust port cover 20C has drain ports 22zC1 and 22zC2 that connect to the drain hose 120p in the machine room 120 via a passage 23Cf beneath the base plate 23C. Drain port 22zC1 is a through-hole located at the bottom of the backflow prevention wall 225. Drain port 22zC2 is a through-hole located inside the frame 22A in the base plate 23C.

The passage 23Cf is located below the drain outlet 22zC2. The passage 23Cf is a space for accumulating foreign matter and may be removable. The passage 23Cf is bent forward in a hook shape, and foreign matter may accumulate in the hook-shaped, curved horizontal passage portion. The lower front portion of the passage 23Cf has a pipe 23Cp to which the drain hose 120p is connected.

The size of the holes in the drain ports 22zC1 and 22zC2, and the size of the holes in the passage 23Cf, should be larger than the size of the holes in the cover exhaust port X20. This configuration allows foreign matter entering through the cover exhaust port X20 to pass through the drain ports 22zC1 and 22zC2 and accumulate in the space of the passage 23Cf. Therefore, the likelihood of the foreign matter becoming clogged in the exhaust port cover 20C can be reduced.

In addition, the size of the holes in the passages for the piping 23Cp and the drain hose 120p may be larger than the size of the holes in the cover exhaust port X20. The definition of the size of the pipe passage holes is the same as the definition of the size of the holes in the drain ports 22zC1, 22zC1. With this configuration, foreign matter entering through the cover exhaust port X20 can pass through the drain ports 22zC1, 22zC2, the passage 23Cf, and the drain hose 120p, and be discharged to the outside.

Furthermore, the base plate 23C in Modification 3 may have a different shape (circular in plan view) from the base plate 23 in the above embodiment.

The embodiments of the present invention have been described above. However, the present invention is not limited to the embodiments described above. For example, although the above embodiments showed an example where the construction machine was a crawler crane, the present invention is applicable to all other mobile cranes such as wheel cranes, truck cranes, rough terrain cranes, and all-terrain cranes, as well as all other cranes such as tower cranes, overhead cranes, jib cranes, retractable cranes, stacker cranes, gantry cranes, and unloaders. Furthermore, the present invention is applicable to other construction machines such as hydraulic excavators, wheel loaders, drilling machines, and foundation machines. Also, although the above embodiments showed an example where the second exhaust port cover was a pipe made of plate material, the second exhaust port cover may be configured to surround the first exhaust port cover with insulating material. Also, although the above embodiments showed a configuration in which the exhaust port cover had a curved exhaust passage, it may also have a configuration mainly with an upward-facing exhaust passage. In addition, the details shown in the embodiments can be appropriately modified without departing from the spirit of the invention.

100 Construction machine 102 Lower traveling body 104 Upper slewing body 106 Boom 107 Hook 109 Walkway 110 Internal combustion engine 111 Exhaust pipe 112 Cab 114 Winch 120 Machine room 120a Housing 120p Drain hose 20, 20A, 20B, 20C Exhaust port cover 21 First exhaust port cover 22 Second exhaust port cover 221 Inclined surface 222 Vertical surface (inner wall surface)
224 Drain cover 225 Backflow prevention wall 227 Adjustment window 22A Frame 22B First part 22C Second part 22z, 22zA, 22zB, 22zC1, 22zC2 Drain port 23, 23C Base plate 23Cf Passageway 23Cp Piping 25 Garbage collection area 25a Storage area 25c Knob e Gap h225a, h225b Through hole O225 Through hole W1, W2 Hole size X110 Exhaust port X20 Cover exhaust port

Claims (8)

Internal combustion engines and
A first exhaust port cover encloses the outside of the exhaust port of the internal combustion engine and forms an exhaust passage,
A second exhaust port cover surrounds the outside of the first exhaust port cover,
Equipped with,
The second exhaust port cover includes a cover exhaust port, a drain port for discharging water that has entered through the cover exhaust port, and a wall surface located below the lower end of the opening of the first exhaust port cover, which guides the exhaust coming out of the opening upward.
It has,
The aforementioned drain is a construction machine capable of discharging water that has flowed down the wall surface. It has a housing that accommodates the internal combustion engine,
The first exhaust port cover is provided on the outside of the housing.
The construction machine according to claim 1. The aforementioned wall surface has an inclined surface that is tilted in a direction that reflects the exhaust upward, and a vertical surface that extends upward from the inclined surface.
The construction machine according to claim 1 or claim 2. The second exhaust port cover includes at least a first component that covers the top and sides of the first exhaust port cover, and a second component that includes the wall surface and is separate from the first component.
A construction machine according to any one of claims 1 to 3. A gap is provided between the outer surface of the first exhaust port cover and the inner surface of the second exhaust port cover.
A shielding portion is provided between the first exhaust port cover and the second exhaust port cover to block a part of the gap.
The construction machine according to claim 4. The size of the hole in the cover exhaust port is less than or equal to the size of the hole in the drain port.
A construction machine according to any one of claims 1 to 5. Internal combustion engines and
A first exhaust port cover encloses the outside of the exhaust port of the internal combustion engine and forms an exhaust passage,
A second exhaust port cover surrounds the outside of the first exhaust port cover,
Equipped with,
The second exhaust port cover has a cover exhaust port and a drain port for discharging water that has entered through the cover exhaust port.
The size of the hole in the cover exhaust port is less than or equal to the size of the hole in the drain port.
The aforementioned drain port is a construction machine that guides foreign matter that has entered through the cover exhaust port to the outside, or guides the foreign matter to a removable waste collection area. Internal combustion engines and
A first exhaust port cover encloses the outside of the exhaust port of the internal combustion engine and forms an exhaust passage,
A second exhaust port cover surrounds the outside of the first exhaust port cover,
Equipped with,
The second exhaust port cover has a cover exhaust port and a drain port for discharging water that has entered through the cover exhaust port.
The size of the hole in the cover exhaust port is less than or equal to the size of the hole in the drain port.
Furthermore, the construction machine is configured such that the portion of the second exhaust port cover that guides water from the cover exhaust port to the drain port is removable.