1. A working machine, characterized by comprising:

a machine room in which an engine is housed;

a cooler disposed inside the machine chamber to cool the engine;

an air passage forming member that forms an air passage from an air inlet to the machine chamber and has a curved portion having a curved shape in a middle of the air passage;

a cooling fan capable of generating a normal wind blown from the air inlet to the cooler through the air passage and a reverse wind blown from the cooler to the air inlet through the air passage, the cooling fan being located downstream of the cooler in a normal wind direction which is a direction in which the normal wind flows;

a dust filter provided between the air passage and the cooler, the dust filter capturing foreign matter contained in the positive air;

a dust collecting section provided at a position shifted to a downstream side in the normal wind direction along the normal wind direction from an inner wall surface of an outer corner section of the curved section, the dust collecting section having an opening section that opens to an upstream side in the normal wind direction and a bottom section that is closed at the downstream side in the normal wind direction, the dust collecting section being configured to collect the foreign matter separated by inertia of the foreign matter at the curved section by introducing the foreign matter into the dust collecting section through the opening section; and the number of the first and second groups,

a rotating member including a lid portion capable of receiving the opening portion, the rotating member being provided in the air path forming member so as to be movable between a closed position and an open position by rotating about a rotating shaft in a direction intersecting the normal wind direction,

the lid section opens the opening section when the rotating member is in the open position, and blocks the opening section when the rotating member is in the closed position,

the rotating member rotates to the open position when receiving the normal wind, and rotates to the closed position when receiving the headwind.

2. The work machine of claim 1,

the dust collecting part is defined by the inner wall surface of the air path forming member and a partition wall positioned at the inner side of the inner wall surface,

the rotating member is rotatably supported by an upper portion of the partition wall.

3. The work machine of claim 2,

the rotating member further includes a windward portion that receives the normal wind and the headwind wind at a position away from the cover portion in a rotating direction of the rotating member,

the rotating member is configured to move to the open position by rotating the windward portion toward the downstream side in the windward direction upon receiving the headwind, and to move to the closed position by rotating the windward portion toward the upstream side in the windward direction upon receiving the headwind.

4. The work machine of claim 3,

a turning direction angle, which is an angle formed by the cover and the windward portion in the turning direction, is set such that both resistance to the positive wind by the cover and resistance to the headwind by the windward portion become smaller than in a case where the turning direction angle is 180 °.

5. The work machine of claim 3,

the windward portion has a curved portion located more inward than a distal end of the windward portion in a rotational radius direction of the rotating member, the curved portion being shaped such that a distal end side portion of the windward portion, which is a portion located more distal end side than the curved portion, is located more upstream of the positive wind than other portions in the closed position.

6. A working machine according to any of claims 3-5,

the rotating member further comprises a closed position stop and an open position stop,

the closed position stopper projects from the pivot shaft by a size smaller than the cover, rotates together with the cover and the windward portion around the pivot shaft, and positions the rotating member at the closed position before the cover abuts against the inner side surface of the partition wall as the rotating member rotates from the open position to the closed position,

the open position stopper protrudes from the pivot shaft by a size smaller than the cover portion and the windward portion, rotates together with the cover portion and the windward portion about the pivot shaft, and positions the rotating member at the open position before the windward portion comes into contact with the outer side surface of the partition wall as the rotating member rotates from the closed position to the open position.

7. The working machine according to any of claims 1 to 5,

the dust collector is provided with a vent hole that communicates the air path with the air path forming member and the outside of the machine room, thereby reducing the pressure inside the dust collector.

8. The work machine of claim 6,

the dust collector is provided with a vent hole that communicates the air path with the air path forming member and the outside of the machine room, thereby reducing the pressure inside the dust collector.

Background

Conventionally, a construction machine including a machine room is known. The machine chamber is disposed at a rear portion of an upper revolving structure of the construction machine, and houses an engine, a cooler and a cooling fan for cooling the engine, and a dust filter. The cooling fan generates a positive wind (cooling wind) which is a positive wind flowing from an intake port to the cooler. The dust filter is attached to the cooler so as to be positioned on the upstream side of the normal wind, and captures and collects foreign matter such as dust in the normal wind.

The foreign matter is accumulated in the dust-proof filter, and blocks the mesh of the dust-proof filter, thereby blocking the passage of air. This will result in overheating. Therefore, cleaning is required to remove foreign matter from the dust filter. In particular, when the construction machine is used in an environment where a large amount of dust or the like floats, such as an industrial waste site and a demolition site, the cleaning is frequently performed. This results in a reduction in the work efficiency of the construction machine.

Patent document 1 (japanese patent application laid-open No. 2020 and 121676) discloses a construction machine provided with a dust-proof filter, which is capable of suppressing a reduction in work efficiency due to cleaning of the dust-proof filter. The engineering machinery specifically comprises an air inlet cylinder and a dust collecting part. The intake cylinder extends from the intake port to the intake chamber and has a bent portion in the middle. The dust collecting part is located on the downstream side of the inner wall surface of the outer corner part of the bending part. In the curved portion, a part or all of large foreign matters which may cause clogging among the foreign matters contained in the intake air are separated by inertia thereof and collected in the dust collecting portion.

Patent document 2 (japanese patent application laid-open No. 2007-307464) discloses a circulation machine provided with a cooling fan and a dust-proof filter (dust-proof screen). The cooling fan can rotate in both forward and reverse directions. When the cooling fan rotates in the reverse direction, foreign matter such as dust adhering to the dust filter can be discharged without manual operation. Specifically, the rotation of the cooling fan in the opposite direction causes an air flow in the opposite direction to the normal cooling air, that is, an upwind flow from the downstream side to the upstream side of the cooling air, and the upwind blows off and drops the dust and the like adhering to and accumulated on the dust-proof filter. The dust and the like are discharged to the outside of the machine room through the discharge port opened by opening the lid.

However, the construction machine described in patent document 1 does not contemplate generation of headwind by the reverse rotation of the cooling fan. If the cooling fan of the construction machine rotates in the reverse direction to generate a reverse wind, the reverse wind may cause the foreign matter collected by the dust collecting unit to fly and scatter to the outside of the dust collecting unit.

On the other hand, the circulation machine described in patent document 2 cannot separate and collect the dust and the like from the cooling air, and can simply blow and discharge the dust and the like from the dust screen. Therefore, the dust or the like may be attached to the dust-proof filter again by the headwind.

Disclosure of Invention

The invention aims to provide a construction machine which can reliably clean a dust filter and recover foreign matters.

The invention provides a construction machine comprising: a machine chamber for housing an engine; a cooler disposed inside the machine chamber and cooling the engine; an air passage forming member; a cooling fan; a dust-proof filter; a dust collecting part; and a rotating member. The air passage forming member forms an air passage from an air inlet to the machine room. The cooling fan is capable of generating a normal wind that flows from the air inlet to the cooler through the air passage, and a counter wind that flows from the cooler to the air inlet through the air passage. The cooling fan is located downstream of the cooler in a direction of the positive wind, which is a direction in which the positive wind flows, and blows off foreign matter adhering to the dust filter by the headwind. The air path forming member has a curved portion curved in the middle of the air path, and the curved portion has a shape capable of separating foreign matter from the cooling air by using inertia of the foreign matter passing through the curved portion. The dust filter is provided between the air path forming member and the cooler, and traps foreign matter contained in the positive air. The dust collecting portion is located at a position shifted to a downstream side in the normal wind direction from an inner wall surface of an outer corner portion of the curved portion along the normal wind direction. The dust collecting part has an opening part which is opened to the upstream side in the positive wind direction and a bottom part which is closed at the downstream side in the positive wind direction, and the foreign matters separated at the bending part are introduced into the dust collecting part through the opening part and collected. The rotating member includes a lid portion capable of receiving the opening portion, is provided in the air path forming member, and is movable between an open position and a closed position by rotating about a rotating shaft in a direction intersecting the normal wind direction. The lid opens the opening in the open position, and blocks the opening in the closed position. The wind turbine is rotated to the open position when the wind is subjected to the normal wind, and is rotated to the closed position when the wind is subjected to the upwind.

Drawings

Fig. 1 is a side view of a construction machine according to each embodiment of the present invention.

Fig. 2 is a sectional rear view showing a main part of the construction machine.

Fig. 3 is a sectional rear view of the positive wind passing through the air passage of the construction machine according to embodiment 1 of the present invention.

Fig. 4 is a sectional rear view showing a counter wind passing through the wind path according to embodiment 1.

Fig. 5 is a sectional rear view showing a state where the dust box is taken out of the air path forming member according to embodiment 1.

Fig. 6 is a sectional rear view of the normal wind passing through the wind path according to embodiment 2 of the present invention.

Fig. 7 is a sectional rear view showing a counter wind passing through the wind path according to embodiment 2.

Fig. 8 is a sectional rear view of the normal wind passing through the wind path according to embodiment 3 of the present invention.

Fig. 9 is a sectional rear view showing a counter wind passing through the wind path according to embodiment 3.

Fig. 10 is a sectional rear view of the normal wind passing through the wind path according to embodiment 4 of the present invention.

Fig. 11 is a sectional rear view showing a counter wind passing through the wind path according to embodiment 4.

Detailed Description

Preferred embodiments will be described below with reference to the accompanying drawings.

Fig. 1 is a side view of a construction machine 10 according to each embodiment, and fig. 2 is a sectional rear view showing a main part of the construction machine.

The construction machine 10 is, for example, a hydraulic excavator, and includes a crawler-type lower traveling structure 11, an upper revolving structure 20 that is rotatably mounted on the lower traveling structure 11, and an attachment 13. The upper slewing body 20 includes a cab 14, a machine room 15, an upper frame 21, and a counterweight 22. The working machine 10 is, for example, a small swing type hydraulic excavator, and the upper swing body 20 has a small swing radius.

The upper frame 21 constitutes a lower portion of the upper slewing body 20. The cab 14 and the machine room 15 are provided on the upper frame 21. The cab 14 defines a rectangular box-shaped cab, for example, and is provided on the upper frame 21 adjacent to the attachment 13.

The machine chamber 15 is located at the rear of the upper slewing body 20. The machine chamber 15 has a storage space defined by the counterweight 22 and the machine chamber cover 16. The counterweight 22 has a shape along the outer peripheral edge of the rear portion of the upper slewing body 20. The machine chamber cover 16 covers the housing space from above.

The machine chamber 15 houses an engine 31, a hydraulic pump 32, and a cooling device for cooling the engine 31. The cooling device includes a cooler 35, a cooling fan 33, a fan shroud 34, and an intake duct 40. The cooling fan 33 is capable of generating a positive wind X as described in detail later. The intake duct 40, the cooler 35, the cooling fan 33, the engine 31, and the hydraulic pump 32 are arranged in parallel in this order from the upstream side in the normal wind direction, which is the flow direction of the normal wind X.

The machine chamber 15 is provided with a wall 17 inside. The wall portion 17 extends in the vertical direction to divide the storage space of the machine room 15 into an engine room 15a and an intake chamber 15 b. The engine room 15a is located upstream of the wall portion 17 in the normal wind direction, and houses the cooler 35, the cooling fan 33, and the engine 31. The intake chamber 15b is located downstream of the wall portion 17 in the normal wind direction, and accommodates the intake pipe 40 therein.

The construction machine 10 further includes an intake duct 50 shown in fig. 3 to 5. The air inlet tube 50 is a cylindrical body surrounding the air passage 50d, and is connected to the machine chamber 15. The intake cylinder 50 has both open ends. One of the two end portions surrounds an air inlet 50a opening to the outside of the machine chamber 15, and the other end portion constitutes a connecting portion 50b connected to the machine chamber 15. That is, the intake duct 50 corresponds to an air passage forming member that forms the air passage 50d that is a passage from the intake port 50a to the positive air X in the machine room 15. The connection portion 50b is connected to the machine chamber cover 16 so as to be connected to an air intake opening formed in the machine chamber cover 16. The opening is provided in the upper left side of the portion of the machine chamber cover 16 that forms the ceiling wall of the intake chamber 15 b. On the other hand, an exhaust port 16a is provided in the upper right side of the portion of the machine room cover 16 constituting the ceiling wall of the engine room 15a, and air can be discharged to the outside of the machine room 15 through the exhaust port 16 a.

The cooler 35 is constituted by a heat exchanger, such as a radiator, for cooling the engine 31. The cooler 35 has a core surface disposed to face in the vehicle lateral direction.

The cooling fan 33 is rotatable in both a forward rotation direction and a reverse rotation direction opposite thereto. The cooling fan 33 generates the normal wind X when rotating in the normal rotation direction and generates the counter wind Y when rotating in the reverse rotation direction. The positive air X is cooling air that flows from the air inlet 50a of the air intake duct 50 through the air passage 50d and the air intake duct 40 in a direction toward the cooler 35. The headwind Y is a wind that flows from the cooler 35 through the intake duct 40 and the air duct 50d of the intake duct 50 in a direction toward the intake port 50a, i.e., a wind in a direction opposite to the normal wind X. Both the positive wind X and the negative wind Y pass through the air passage 50 d.

The motor 31 has a drive shaft extending in the horizontal direction. The cooling fan 33 is connected to one of both end portions of the drive shaft (left end portion in fig. 2), and is rotated by the motor 31. The cooling fan 33 is located downstream of the cooler 35 in the normal wind direction, specifically, between the engine 31 and the cooler 35. The fan shroud 34 is disposed so as to surround the cooling fan 33, and guides the air having passed through the cooler 35 to the engine 31. The hydraulic pump 32 is connected to the other end (right end in fig. 2) of both end portions of the drive shaft of the engine 31.

The intake duct 40 is positioned between the air passage 50d and the cooler 35. The intake duct 40 is a duct that hermetically surrounds the intake side space of the cooler 35. The dust filter 44 is disposed to block the air inlet of the air intake duct 40, and to allow the positive wind X to pass therethrough and to capture foreign matter D having a large diameter. The foreign matter D having a large diameter is dust or the like having a size enough to block the cooler 35 or the like.

In the construction machine 10, when the engine 31 drives the cooling fan 33 in the forward rotation direction, the positive wind X, which is an air flow flowing from the left side to the right side in fig. 2, is generated inside the machine chamber 15. The positive wind X acts as cooling wind. Specifically, heat exchange is performed between the air forming the positive wind X and the refrigerant flowing through the cooler 35, and the refrigerant cooled by the heat exchange cools the engine 31 and the like. Specifically, when the cooling fan 33 rotates in the forward rotation direction, external air is drawn through the air inlet 50a of the air intake duct 50, and the forward wind X flowing through the inside of the machine room 15 is generated. The air forming the positive wind X passes through the air passage 50d in the intake duct 50, the intake chamber 15b, the dust filter 44, and the intake duct 40, and enters the engine room 15 a. When passing through the cooler 35, the air absorbs heat of the refrigerant flowing through the cooler 35 to become hot air, and is discharged to the outside of the machine room 15 through the exhaust port 16 a.

The cooling fan 33 is driven to rotate in the reverse rotation direction to clean the dust filter 44. The cooling fan 33 rotating in the reverse rotation direction in this way generates the headwind Y, which is an air flow from the cooling fan 33 to the intake port 15a (from the right to the left in fig. 2) through the dust filter 44. The headwind blows off foreign matter adhering to the upstream side surface of the dust filter 44, that is, the surface of the two surfaces of the dust filter 44 positioned on the upstream side in the normal wind direction, and can clean the dust filter 44.

The construction machine 10 according to the present embodiment includes a mechanism for collecting foreign matter contained in intake air sucked from the outside, in addition to the dust-proof filter 44. Specifically, the intake duct 50 includes a curved portion 50c, and the construction machine 1 further includes a dust collecting portion 51 and a rotating member 60.

The curved portion 50c has a shape curved at a middle portion between the air inlet 50a and the connection portion 50 b. Specifically, the bent portion 50c according to the present embodiment is bent substantially at a right angle such that a portion including the connecting portion 50b, which is a portion on the downstream side of the bent portion 50c in the normal wind direction, extends in the vertical direction, and a portion including the air inlet 50a, which is a portion on the upstream side of the bent portion 50c, faces in the horizontal direction (the horizontal direction in fig. 2 and 3).

As shown by the broken-line arrows in fig. 2 and 3, some or all of the large-diameter foreign matter D among the foreign matter contained in the normal wind X passing through the air passage 50D turns at the curved portion 50c and constantly hits against the inner wall surface of the outer corner portion 50f by the inertia and centrifugal force of the large-diameter foreign matter D. The outer corner portion 50f is a portion of the cylinder wall of the air intake tube 50 constituting the curved portion 50c, which is located outside the air passage 50d in the bending radius direction. Accordingly, the foreign matter D separated from the normal wind X and hitting the inner wall surface travels from the inner wall surface to the downstream side (downward in fig. 3) in the normal wind direction along the normal wind direction, and is collected by the dust collecting unit 51 in front.

The dust collecting unit 51 is provided at a position capable of receiving the foreign matters D as described above. Specifically, as shown in fig. 3, the dust collecting part 51 is partitioned by a downstream side inner wall surface 50e of the intake cylinder 50 and a partition wall 51 a. The downstream side inner wall surface 50e is an inner wall surface of the intake duct 50 at a position shifted to a downstream side in the normal wind direction along the normal wind direction from an inner wall surface of the outer corner portion 50f of the bent portion 50 c. The partition wall 51a has a shape surrounding a dust collecting part space at a position inside the downstream side inner wall surface 50 e. The dust collecting part 51 has an opening 51b that opens to the upstream side (upper side in fig. 3) in the normal wind direction, and a bottom 51c that is closed to the downstream side (lower side in fig. 3) in the normal wind direction.

The pivot member 60 includes a pivot shaft 64, a cover 61, and a windward portion 62. The cover 61 and the windward portion 62 are plate-shaped members and extend in opposite directions from the support shaft 64.

The support shaft 64 extends in a direction intersecting the normal wind direction (vertical direction in fig. 3), in the present embodiment, in a direction orthogonal to the normal wind direction (front-rear direction; depth direction in fig. 3). The rotating member 60 is supported above the dust collecting unit 51 and can rotate about a rotating shaft that is the central axis of the support shaft 64. The rotary member 60 is preferably supported by an upper portion of the partition wall 51 a.

The cover 61 extends in a direction perpendicular to the support shaft 64 from the support shaft 64 toward the upper side of the dust collecting part 51, that is, in a direction of a rotation radius of the rotating member 60. The lid 61 has a size capable of covering the opening 51 b.

The rotary member 60 is movable between a closed position shown by a two-dot chain line and an open position shown by a solid line in fig. 3 by rotating about the support shaft 64. In the open position, the cover 61 extends upward from the support shaft 64 to open the opening 51 b. In the closed position, the cover 61 extends horizontally from the support shaft 64 to cover the opening 51 b.

The windward portion 62 blocks the positive wind X and the negative wind Y in the intake tube 50, and rotates the entire rotary member 60 between the open position and the closed position. The windward portion 62 is located at a position separated from the cover portion 61 in the rotational direction. The rotational direction is a direction in which the rotational member 60 rotates. The windward portion 62 is integrally connected to the cover portion 61 via the support shaft 64. For example, the cover 61 and the windward portion 62 are positioned substantially on the same line with the support shaft 64 therebetween.

In fig. 3, when the windward portion 62 extends in the horizontal direction as indicated by the two-dot chain line and the wind path 50d is cut off and the positive wind X flows through the wind path 50s, the windward portion 62 receives a downward biasing force applied by the positive wind X, and the rotating member 60 rotates so that the windward portion 62 moves from the upstream side to the downstream side in the positive wind direction (moves downward in fig. 3). Then, as shown by the solid line, the rotating member 60 is held at the open position, which is the position where the windward portion 62 is close to the outer side surface of the partition wall 51a, and at this open position, the cover portion 61 opens the opening portion 51b of the dust collection portion 51 upward.

On the other hand, when a headwind Y flows in the air passage 50s with the rotary member 60 in the open position, the windward portion 62 receives an upward biasing force from the headwind Y, and the rotary member 60 rotates such that the windward portion 62 moves from the downstream side to the upstream side in the windward direction (upward movement in fig. 3). Then, as shown by the two-dot chain line, the rotating member 60 is held at the closed position, which is a position where the distal end portion of the lid portion 61 is close to the downstream side inner wall surface 50e, and at the closed position, the lid portion 61 covers the opening portion 51b of the dust collecting portion 51 from above.

A specific portion of the wall of the intake pipe 50 according to the present embodiment constitutes a door 53 shown in fig. 3. The specific portion is a portion including the downstream side inner wall surface 50e, that is, a portion including a portion defining the dust collecting part 51. The door 53 is rotatable outward with respect to a main portion of the wall of the intake duct 50, i.e., a portion other than the door 53, and is movable between a door closed position shown in fig. 3 and 4 and a door open position shown in fig. 5. In the example shown in fig. 3 to 5, the lower end of the door 53 is connected to the connecting portion 50b so as to be rotatable about a support shaft 55 extending in the horizontal direction (the front-rear direction; the depth direction in fig. 3). Further, a lock mechanism 58 is provided at an upper end portion of the door 53, and the lock mechanism 58 is detachably engaged with the main body portion to lock the door 53 at the door closing position.

In a state where the door 53 is located at the door closing position shown in fig. 3 and 4, the door 53 is in a substantially upright posture, and the dust collecting part 51 can exert its original function in the intake duct 50. That is, the dust collecting part 51 can receive and collect the foreign matter D separated from the positive wind X and falling at the curved part 50 c.

On the other hand, in a state where the door 53 is positioned at the door-open position shown in fig. 5, the door 53 is tilted outward, and the dust collecting part 51 is exposed to the outside of the air intake duct 50. Therefore, the foreign matters D remaining in the dust collecting part 51 can be easily collected. The dust collecting unit 51 according to the present embodiment has a double structure, and includes a dust box 57 provided further inside the partition wall 51 a. The dust box 57 is detachably attached to the downstream side inner wall surface 50e in a posture of being opened upward through the opening 51b, and receives the foreign matter D falling through the opening 51 b. Therefore, when the dust box 57 is taken out from the dust collecting part 51 in a state where the door 53 is positioned at the door opening position, the foreign matters D accumulated in the dust box 57 in the dust collecting part 51 can be easily collected together with the dust box 57.

According to the construction machine 10 of embodiment 1 configured as described above, as the cooling fan 33 generates the positive wind X, a part or all of the foreign matter contained in the outside air introduced into the air passage 50d from the air inlet 50a is separated from the outside air at the bent portion 50c in the middle of the air passage 50d by the inertia of the foreign matter. The foreign matter thus separated can be collected by the dust collecting part 51 located at a position shifted from the outer corner part 50f of the curved part 50c toward the downstream side in the normal wind direction along the normal wind direction.

In the construction machine 10, as the normal wind X and the headwind Y pass through the air passage 50D, the rotating member 60 rotates to switch between an open position in which the cover 61 opens the opening 51b of the dust collection part 51 and a closed position in which the cover 61 covers the opening 51b, and therefore, the foreign matter D can be collected in the dust collection part 51, and the foreign matter D collected in the dust collection part 51 can be prevented from scattering to the outside of the dust collection part 51. Specifically, the rotating member 60 opens the opening 51b when the normal wind X passes through the air passage 50D, so that the foreign matter D can be introduced into the dust collector 51 through the opening 51b, and blocks the opening 51b when the reverse wind Y passes through the air passage 50D, so that the foreign matter D can be prevented from scattering from the opening 51b to the outside of the dust collector 51. This prevents the foreign matter D collected in the dust collection part 51 from flying and scattering outside the dust collection part 51. The opening and closing of the opening 51b by the lid 61 is automatically performed in conjunction with the generation of the normal wind Y and the headwind Y.

Fig. 6 and 7 show the interior of an intake pipe 50 of a construction machine 10 according to embodiment 2 of the present invention. In embodiment 2, as in embodiment 1, the dust collecting part 51 and the rotary member 160 having the lid part 161 and the windward part 162 are provided in the intake duct 50, and the rotational direction angle, which is the angle formed by the lid part 161 and the windward part 162, is different from that in embodiment 1 in the rotational direction. In the embodiments described below, the same reference numerals are given to the same portions as those shown in fig. 3 and 4, and detailed description thereof is omitted.

In embodiment 1, the cover portion 61 and the windward portion 62 of the rotating member 60 are arranged so as to extend substantially on a straight line, that is, the rotational direction angle formed by the cover portion 61 and the windward portion 62 in the rotational direction is 180 °, whereas in embodiment 2, the rotational direction angle formed by the cover portion 161 and the windward portion 162 is an angle smaller than 180 °. The turning direction angle is set to an angle at which the cover 61 and the windward portion 62 exert less resistance to the positive wind X and the negative wind Y, respectively, than in embodiment 1.

Specifically, as shown in fig. 6, when the opening 51b is opened by the lid 161 as the normal wind X flows through the air passage 50d defined by the intake duct 50, the rotational direction angle is set so that the distal end portion of the lid 161 faces the obliquely upward intake port 50a, that is, the lid 61 extends obliquely upward from the support shaft 64 of the rotary member 160. In this state, the cover 161 extends in substantially the same direction as the direction in which the normal wind X flows around the cover 161, and therefore the cover 161 exerts a small resistance to the normal wind X.

On the other hand, as shown in fig. 7, in a state where the headwind Y flows in the air passage 50d and the cover 161 covers the opening 51b, the turning direction angle is set such that the distal end portion of the windward portion 162 faces the air inlet 50a obliquely upward, that is, the windward portion 62 extends obliquely upward from the support shaft 64 of the turning member 160. In this state, the windward portion 162 extends in substantially the same direction as the direction in which the headwind Y flows around the windward portion 162, and therefore the resistance applied by the windward portion 162 to the headwind Y is also small.

Thus, according to the construction machine 10 of embodiment 2, the resistance applied to the positive wind X and the counter wind Y by the cover 161 and the windward portion 162 can be effectively reduced compared to embodiment 1 in which the rotational direction angle formed in the rotational direction by the cover 61 and the windward portion 62 is 180 °.

The dust collecting part 51 is preferably provided with a vent hole 51d as shown in fig. 6 and 7. The vent hole 51d communicates the air passage 50d, the intake cylinder 50, and the outside of the machine chamber 15 with each other, thereby reducing the pressure inside the dust collector 51. The vent hole 51d allows the inside of the dust collecting part 51 to communicate with the outside even when the lid part 161 closes the opening part 51 b. The pressure reduction in the dust collecting part 51 allowed by the ventilation hole 51D helps the lid part 161 to close the opening 51b of the dust collecting part 51 when the headwind Y flows, thereby improving the effect of preventing the foreign matter D collected in the dust collecting part 51 when the headwind X is generated from being pushed out of the dust collecting part 51 by the wind pressure of the headwind Y.

Fig. 8 and 9 show the interior of an intake pipe 50 of a construction machine 10 according to embodiment 3 of the present invention. In embodiment 3, as in embodiment 1, the dust collecting part 51 and the rotary member 260 having the cover part 261 and the windward part 262 are provided in the intake cylinder 50, but the shape of the windward part 262 is different from the shape of the windward part 62 in embodiment 1.

Specifically, the windward portion 262 according to embodiment 3 includes a curved portion 262 a. The curved portion 262a is located more inward in the turning radius direction than the distal end of the windward portion 262 (preferably, slightly closer to the distal end). The windward portion 262 is bent at the bent portion 262a to form an obtuse angle. Specifically, as shown by the two-dot chain line in fig. 8, in the closed position where the cover portion 61 of the rotating member 260 closes the opening portion 51b of the dust collecting portion 51, the bending direction and angle at the bent portion 262a are set so that the distal end portion 262b of the windward portion 262, that is, the portion on the distal end side of the bent portion 262a, is directed upstream in the normal wind direction (upward in fig. 8) from the other portions.

As shown in fig. 8, the curved portion 262a assists the opening of the opening 51b of the cover 61 by the distal end portion 262b of the windward portion 262 being easily biased from above by the positive wind X. On the other hand, as shown by the two-dot chain line in fig. 9, in a state where the opening 51b is open, the distal end side portion 262b of the windward portion 262 is easily subjected to a force applied from below by the headwind Y, and assists the lid portion 61 to close the opening 51 b.

Fig. 10 and 11 show the interior of an intake pipe 50 of a construction machine 10 according to embodiment 4 of the present invention. In embodiment 4, the dust collecting part 51 and the rotary member 360 are provided in the air intake duct 50, and the rotary member 360 has the cover part 61 and the windward part 262, as in embodiment 1, but the rotary member 360 further includes the closed position stopper 71 and the open position stopper 72, which is different from the rotary member 60 in embodiment 1.

The closed position stopper 71 protrudes from the support shaft 64 of the pivot member 360 to a size smaller than the cover 61 and the windward portion 62, and pivots about the support shaft 64 together with the cover 61 and the windward portion 62. The position of the closed position stopper 71 is set as shown in fig. 11, and as the rotating member 360 rotates from the open position to the closed position, the closed position stopper 71 abuts against the inner side surface of the partition wall 51a before the lid portion 61 abuts against the inner side surface, thereby determining the closed position of the rotating member 360.

The open position stopper 72 protrudes from the support shaft 64 of the pivot member 360 to a size smaller than the cover 61 and the windward portion 62, and pivots about the support shaft 64 together with the cover 61 and the windward portion 62. The position of the open position stopper 72 is set as shown in fig. 10, and as the turning member 360 is turned from the closed position to the open position, the open position stopper 72 abuts against the outer side surface of the partition wall 51a prior to the windward portion 62, thereby determining the open position of the turning member 360.

The closed position stopper 71 abuts against the inner side surface of the partition wall 51a at a closed position where the cover 61 closes the opening 51b, thereby positioning the rotary member 360 at the closed position and preventing the cover 61 from hitting the partition wall 51 a. The open position stopper 72 is configured to abut against the outside of the partition wall 51a prior to the windward portion 62 at a position where the opening 51b is opened by the lid portion 61, thereby positioning the pivot member 360 at the open position and preventing the windward portion 62 from striking against the partition wall 51 a.

The closed position stopper 71 and the open position stopper 72 have a size smaller than the size of the cover 61 and the windward portion 62 in the rotation radius direction, and therefore, the cover 61 and the windward portion 62 can be prevented from hitting the partition wall 51a while suppressing an increase in the moment of inertia of the entire rotary member 360.

The material of the turning member 360 is not limited, but the closed position stopper 71 and the open position stopper 72 are preferably made of a material having a specific gravity smaller than that of the material of the lid portion 61 and the windward portion 62. Accordingly, the moment of inertia of the entire rotary member 360 can be further suppressed.

The construction machine according to the present invention is not limited to the crawler type hydraulic excavator shown in fig. 1, and may be other construction machines such as a tire type hydraulic excavator and a mobile crane.

The cooling fan of the present invention is only required to be capable of generating both the normal wind and the headwind, and is not limited to a cooling fan that generates the normal wind by rotating in the normal rotation direction and generates the headwind Y by rotating in the reverse rotation direction, as in the cooling fan 33 described above. For example, the headwind and the headwind may be switched by changing the angle of the blades constituting the cooling fan.

All points described in the above embodiments are only examples and should not be construed as limitations. Further, changes and modifications within the equivalent scope of the claims are included in the scope of the claims of the present invention.

As described above, the present invention provides a construction machine capable of reliably cleaning a dust filter and collecting foreign matter. Provided is a construction machine including: a machine room in which an engine is housed; a cooler that is disposed inside the machine chamber and cools the engine; an air passage forming member forming an air passage from an air inlet to the machine room; a cooling fan; a dust-proof filter; a dust collecting part; and a rotating member. The cooling fan is capable of generating a normal wind blowing from the air inlet to the cooler through the air passage and a reverse wind blowing from the cooler to the air inlet through the air passage, and is located downstream of the cooler in a normal wind direction which is a direction in which the normal wind flows, and blows off foreign matters adhering to the dust filter by the reverse wind. The air path forming member has a curved portion having a curved shape in a middle of the air path, and the curved portion has a shape capable of separating foreign matter passing through the curved portion from the cooling air by using inertia of the foreign matter. The dust filter is disposed between the air passage and the cooler, and is configured to capture foreign matter contained in the positive air. The dust collecting part is provided at a position shifted to the downstream side in the normal wind direction from the inner wall surface of the outer corner part of the curved part along the normal wind direction. The dust collecting section has an opening portion that opens to an upstream side in the normal wind direction and a bottom portion that is closed at a downstream side in the normal wind direction, and the foreign matter separated by inertia of the foreign matter at the bent portion is introduced into the dust collecting section through the opening portion and collected. The rotating member includes a lid portion capable of receiving the opening portion, and is provided in the air path forming member so as to be movable between a closed position and an open position by rotating about a rotating shaft in a direction intersecting the normal wind direction. The cover opens the opening when the rotating member is in the open position, and blocks the opening when the rotating member is in the closed position. The rotating member rotates to the open position when receiving the normal wind, and rotates to the closed position when receiving the headwind.

In the above construction machine, the curved portion of the air path forming member may separate a part or all of large foreign matter contained in the outside air introduced from the intake port with the positive wind from the outside air by inertia of the foreign matter. Specifically, as described above, since a part or all of the large foreign matter has a significantly large inertia compared to the outside air sucked in from the intake port, the direction of the large foreign matter cannot be smoothly changed at the bent portion, and the large foreign matter is separated from the air and collides against the inner wall surface of the outer corner of the bent portion. The foreign matter can move from the inner wall surface to the downstream side in the normal wind direction along the normal wind direction, and can be collected by the dust collecting part arranged at the front.

In the construction machine, the rotation of the rotating member caused by the normal wind and the counter wind generated by the cooling fan can collect the foreign matters in the dust collecting unit and prevent the collected foreign matters from scattering. Specifically, when the rotating member rotates to the open position when the positive wind is received, the cover opens the opening, and the dust collecting unit can collect the foreign matter. On the other hand, the rotating member rotates to the closed position when the headwind is received, and the cover portion covers the opening portion, so that the foreign matter collected in the dust collecting portion can be effectively prevented from scattering from the opening portion to the outside of the dust collecting portion.

More specifically, the dust collecting unit is preferably defined by an inner wall surface of the air passage forming member and a partition wall located inward of the inner wall surface. In this aspect, it is preferable that the rotating member is rotatably supported by an upper portion of the partition wall. Since the partition wall is located more inward than the inner wall surface of the air path forming member and is more likely to be subjected to the positive wind and the negative wind, the rotating member supported at the upper portion of the partition wall can more effectively receive the positive wind and the negative wind and rotate.

Specifically, it is preferable that the turning member further includes a windward portion that receives the normal wind and the headwind at a position away from the cover portion in a turning direction of the turning member, and the turning member is configured such that the turning member moves to the open position by turning the windward portion to a downstream side in the normal wind direction by receiving the normal wind, and the turning member moves to the closed position by turning the windward portion to an upstream side in the normal wind direction by receiving the headwind. The rotating member can efficiently receive the normal wind and the headwind and automatically and reliably open and close the opening portion only with a simple structure including the cover portion and the windward portion.

Preferably, a turning direction angle, which is an angle formed by the cover and the windward portion in the turning direction, is smaller in both resistance to the positive wind and resistance to the counter wind by the windward portion than in a case where the turning direction angle is 180 °. This reduces the resistance applied to the positive wind and the negative wind by the cover and the windward portion, respectively, and suppresses a decrease in the suction efficiency of the positive wind and the cleaning efficiency of the dust filter by the negative wind.

Preferably, the windward portion has a curved portion located further inward than a distal end of the windward portion in a rotational radius direction of the rotary member, and the curved portion is shaped such that a distal end side portion of the windward portion is located further toward an upstream side of the positive wind than other portions in the closed position. The distal end portion is a portion closer to the distal end side than the bent portion. With such a shape, the windward portion can easily catch the positive wind and the negative wind, and thus the rotating member can be rotated more reliably.

Preferably, the rotating member further comprises a closed position stop and an open position stop. The closed position stopper projects from the pivot shaft by a size smaller than the cover, rotates together with the cover and the windward portion about the pivot shaft, and positions the rotating member at the closed position before the cover abuts against the inner side surface of the partition wall as the rotating member rotates from the open position to the closed position. The open position stopper protrudes from the pivot shaft by a size smaller than the cover portion and the windward portion, rotates together with the cover portion and the windward portion about the pivot shaft, and positions the rotating member at the open position before the windward portion comes into contact with the outer side surface of the partition wall as the rotating member rotates from the closed position to the open position. The closed position stopper and the open position stopper can reliably position the rotating member at the closed position and the open position while suppressing an increase in the moment of inertia of the entire rotating member, and prevent the cover and the windward portion from hitting the partition wall.

Preferably, the dust collecting part is provided with a vent hole. The vent hole communicates the air path with the air path forming member and the outside of the machine chamber, and allows the inside of the dust collector to be depressurized. This decompression is assisted the lid utilizes the headwind to seal the opening of dust collecting part to, can improve prevent to scatter the effect, prevent to utilize the forewind to be retrieved the foreign matter in the dust collecting part temporarily because of the wind pressure of headwind is extruded the effect outside the dust collecting part.

Although the present invention has been fully described with reference to the accompanying drawings and examples, it is to be understood that various changes and modifications will be apparent to those skilled in the art. Accordingly, unless such changes and modifications depart from the scope of the present invention as defined herein, they should be construed as being included therein.