JP2016205117A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to inhibit overcooling of a coolant of a heat exchanger, with a relatively simple structure.SOLUTION: A shield member 55 is detachably attached to an air filter 50. The shield member 55 includes: a tabular shield part 56 for shielding at least part of a filter surface of the air filter 50; an engagement part 57 that is integrally formed by bending the shield part 56's upper edge part and engages with the air filter 50's filter frame 51's upper edge part; and a contact unit 58 that is integrally formed by bending the shield part 56's side edge part on the vehicle rear side and contacts with the air filter 50's filter frame 51's side wall surface on the vehicle rear side.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a construction machine.

  When working with a construction machine in a cold region where the outside air temperature is below freezing, the cooling water of the radiator and the oil oil of the oil cooler that exchange heat with the outside air may be supercooled. In order to prevent this overcooling, a configuration is known in which the amount of cooling air passing through a radiator or oil cooler can be adjusted (see, for example, Patent Documents 1 and 2).

  Patent Document 1 discloses a configuration including a radiator grill device having a louver attached to a radiator opening so as to be openable and closable, and a driving means for opening and closing the louver. When the water temperature and the oil temperature are lower than the respective set temperatures, the louver is positioned at the closed position, and when both are higher than the set temperature, the louver is positioned at the open position.

  Patent Document 2 discloses a configuration including a shutter device having a plurality of vanes that can be opened and closed in a fully open state or a fully closed state, and a cylinder that drives the vanes. And the air volume which passes a radiator is adjusted by opening and closing the vane of a shutter apparatus according to the cooling water temperature of an engine.

JP 2008-37343 A Japanese Utility Model Publication No. 4-82318

  However, in the inventions of Patent Documents 1 and 2, it is necessary to mount a radiator grill device and a shutter device in order to adjust the amount of cooling air passing through a heat exchanger such as a radiator. Therefore, there exists a problem that an apparatus will enlarge.

  Further, there is a problem that it is difficult to secure a mounting space even if the radiator grill device of Patent Literature 1 and the shutter device of Patent Literature 2 are retrofitted to, for example, an existing small turning construction machine.

  This invention is made | formed in view of this point, The objective is to enable it to suppress that the refrigerant | coolant of a heat exchanger becomes overcooling with a comparatively simple structure.

  The present invention is directed to a construction machine including a lower traveling body, an upper revolving body mounted on the lower traveling body, and a machine room cover that covers a machine room provided on the upper revolving body. The solution was taken.

That is, the first invention is a fan for taking outside air into the machine room,
An air filter for collecting dust contained in the outside air taken into the machine room;
A heat exchanger disposed downstream of the air filter in the air flow direction from the air filter;
An air filter holding part that holds the air filter in a detachable manner in a posture in which the filter surface of the air filter faces the core surface of the heat exchanger;
And a shielding member that is detachably attached to the air filter and shields at least a part of a filter surface of the air filter.

  In the first invention, the shielding member is detachably attached to the air filter so as to shield at least a part of the filter surface of the air filter. With such a configuration, since the flow area of the outside air in the air filter is reduced, the amount of air passing through the heat exchanger can be reduced, and the refrigerant in the heat exchanger is prevented from being overcooled in a cold region. be able to.

  Further, when retrofitting a shielding member to an existing construction machine, it is only necessary to detachably attach the shielding member to the air filter removed for maintenance, so that the attaching operation can be easily performed. In addition, it is not necessary to secure a separate installation space for the shielding member.

  In addition, a plurality of shielding members having different areas that shield the filter surface of the air filter are prepared, and the shielding member is replaced according to the outside air temperature in a cold region, so that the outside air circulation area in the air filter can be appropriately changed. Thus, the cooling performance of the heat exchanger can be adjusted.

According to a second invention, in the first invention,
The shielding member includes a shielding portion that shields at least a part of a filter surface of the air filter, and an engaging portion that is integrally provided on the shielding portion and detachably engages with an outer peripheral edge portion of the air filter. It is characterized by having.

  In the second invention, the shielding member can be detachably attached to the air filter simply by hooking and engaging the engaging portion of the shielding member with the upper edge of the air filter, for example. That is, it is possible to easily attach the shielding member to the existing air filter without additional processing such as forming a screw hole on the air filter side.

According to a third invention, in the first invention,
The shielding member has a shielding part that shields at least a part of a filter surface of the air filter, and an engaging part that is detachable from the shielding part and engages with an outer peripheral edge of the air filter. It is characterized by.

  In 3rd invention, when attaching a shielding member to an air filter, after setting a shielding part to the air filter side, an engaging part is inserted so that an air filter and a shielding part may be inserted, and a shielding member is made into an air filter. The assembly workability is improved.

4th invention is 2nd or 3rd invention,
The shielding member has an abutting portion that abuts against a wall surface perpendicular to a surface with which the engaging portion is engaged in an outer peripheral edge portion of the air filter.

  In 4th invention, if it is the structure which engages the engaging part of a shielding member with the upper edge part of an air filter, for example, it is set as the structure which abuts a contact part on the side wall surface of an air filter. Thereby, it can restrict | limit that a shielding member moves to the width direction of an air filter, and can position the shielding member with respect to an air filter.

A fifth invention is the fourth invention,
The contact portion is in contact with the side wall surface in the width direction of the air filter,
The air filter holding part is
A clamping member that contacts the side wall surface on one end side in the width direction of the air filter;
A lock position where the air filter abuts against the side wall surface of the other end in the width direction of the air filter and clamps the air filter with the clamping member, and the air filter is released and the air filter is taken out. A lock member that can be opened and closed between possible unlock positions,
The shielding member is characterized in that, when the lock member is in the lock position, the contact portion is sandwiched between the clamping member and the lock member together with the air filter.

  In the fifth invention, when the lock member is in the lock position, the contact portion of the shielding member is held between the clamping member and the lock member together with the air filter, so that the shielding member is fixed to the air filter. There is no need to provide a separate fixture.

According to a sixth invention, in any one of the second to fifth inventions,
The shielding part of the shielding member is arranged on the upstream side of the air filter in the air flow direction.

  In the sixth aspect of the invention, since the shielding portion of the shielding member is disposed on the upstream side in the air flow direction of the air filter, the shielding portion is pressed against the air filter side by the outside air flowing toward the air filter, thereby shielding the air filter. The part comes into close contact with the air filter. Thereby, the clearance gap between a shielding part and an air filter can be plugged up.

In a seventh aspect based on any one of the second to sixth aspects,
A plurality of the heat exchangers are provided so as to be arranged in the width direction of the heat exchanger, and one of them is constituted by an intercooler for cooling the compressed air,
The shielding portion of the shielding member overlaps at least the core surface of the intercooler when viewed from the air flow direction.

  In 7th invention, since the shielding part of a shielding member has overlapped with the core surface of the intercooler seeing from the air circulation direction, it can suppress that the compressed air of an intercooler becomes overcooling. Thereby, for example, in a construction machine equipped with a diesel particulate filter (Diesel Particulate Filter), the temperature of the exhaust gas can be suppressed from decreasing, and the DPF regeneration can be performed normally.

According to an eighth invention, in any one of the second to seventh inventions,
The shielding part has at least one shutter part movable between a closed position for shielding a filter surface of the air filter and an open position for exposing the filter surface of the air filter. is there.

  In the eighth invention, it is possible to selectively switch whether or not the heat exchanger is cooled by the outside air by moving the shutter portion between the closed position and the open position. In other words, in cold regions, the shutter unit is positioned in the closed position, thereby blocking the outside air and suppressing overcooling of the heat exchanger, while the shutter unit is in the open position in a normal working environment that is not in a cold region. By positioning, the outside air can be taken in and the heat exchanger can be cooled.

In a ninth aspect based on the eighth aspect,
The shielding member includes a switching unit that switches the shutter unit between the closed position and the open position in conjunction with a predetermined switching operation.

  In the ninth invention, when a plurality of shutter portions are provided, the plurality of shutter portions can be opened and closed simultaneously in conjunction with the switching operation of the switching portion. Thereby, since it is not necessary to open and close a some shutter part separately, workability | operativity improves.

In a tenth aspect based on the eighth or ninth aspect,
The shutter unit includes a regulating member that regulates movement of the shutter portion between an open position and a closed position.

  In the tenth invention, the shutter member at the open position is regulated by the regulating member so as not to move to the closed position. Thereby, the malfunction that a shutter part closes unintentionally by vibration etc., and a heat exchanger cannot be cooled can be avoided. In addition, if the shutter member in the closed position is regulated by the regulating member so as not to move to the open position, the shutter part can be prevented from unintentionally opening and being overcooled.

  According to the present invention, since the shielding member is detachably attached to the air filter so as to shield at least a part of the filter surface of the air filter, the outside air circulation area in the air filter is reduced and heat exchange is performed. The amount of air passing through the vessel can be reduced. As a result, it is possible to prevent the refrigerant in the heat exchanger from being supercooled in a cold region.

1 is a perspective view showing an overall configuration of a construction machine according to Embodiment 1 of the present invention. It is a top view which shows the internal structure of an upper revolving body. It is a rear view which shows the internal structure of an upper turning body. It is a perspective view which shows the attachment structure of an air filter. It is a perspective view which shows the structure of a shielding member. It is a perspective view which shows the state which attached the shielding member to the air filter when it sees from the upstream of an air distribution direction. It is a perspective view which shows the state which attached the shielding member to the air filter when it sees from the downstream of an air distribution direction. It is a top view which shows the positional relationship of an air filter and a shielding member. It is a perspective view which shows the structure of the projection plate of an air filter. It is a perspective view which shows the state which moved the lock member to the lock position. It is a perspective view which shows the state which moved the lock member to the lock release position. It is a perspective view when the shutter part of the shielding member concerning this Embodiment 2 exists in an open position. It is a perspective view when a shutter part exists in a closed position. It is a perspective view which shows the attachment state of the control member when a shutter part exists in a closed position. It is a perspective view which shows the attachment state of the control member when a shutter part exists in an open position. It is a perspective view when the shutter part of the shielding member concerning this Embodiment 3 exists in a closed position. It is a perspective view which shows the state which attached / detached the engaging part from the shielding part. It is side surface sectional drawing which shows the state which inserted | pinched the air filter and the shielding member between a pair of guide plates. It is a side view which shows the structure of a control member. It is a perspective view which shows the attachment state of the control member when a shutter part exists in a closed position. It is a perspective view which shows the attachment state of the control member when a shutter part exists in an open position.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature and is not intended to limit the present invention, its application, or its use.

Embodiment 1
FIG. 1 is a perspective view showing an overall configuration of a construction machine according to Embodiment 1 of the present invention. In FIG. 1, up and down and front and rear, left and right directions are indicated by arrows. Unless stated otherwise, the vertical direction will be described according to the directions indicated by these arrows.

  As shown in FIG. 1, the construction machine 10 includes a crawler type lower traveling body 11 and an upper revolving body 20 that is rotatably mounted on the lower traveling body 11. The upper swing body 20 includes an attachment 13, a cab 14, a machine room 15, an upper frame 21, and the like.

  Note that the construction machine 10 of the present embodiment is a small turning type, and the upper turning body 20 is configured to be relatively small so that the turning radius is small, and the outline of the rear part of the upper turning body 20 is viewed from above. It is formed in an arc shape.

  The attachment 13 is installed in the front part of the upper turning body 20, and is composed of a boom 13a, an arm 13b, a bucket 13c, and the like. Each of the booms 13a and the like operates in conjunction with the expansion and contraction of the hydraulic cylinder 13d that is hydraulically controlled, and performs operations such as excavation. The operation of the boom 13a and the like is performed in the cab 14.

  The cab 14 is a rectangular box-shaped cab, and is installed adjacent to the attachment 13 at the left front portion of the upper swing body 20. The machine room 15 is provided at the rear part of the upper swing body 20. The periphery of the machine room 15 is covered with a machine room cover 16. Inside the machine room 15, an engine 35 (see FIG. 2), hydraulic equipment, and the like are housed in a dense state. In the construction machine 10, a part of the machine room cover 16 that covers the rear part of the machine room 15 is configured by a counterweight that secures a front-rear balance with the attachment 13.

  A maintenance hole 17 is formed in the left rear portion of the machine room cover 16. An openable / closable door 18 is attached to the maintenance hole 17. The maintenance hole 17 is an opening for performing maintenance of various devices arranged in the machine room 15, and an air filter 50 to be described later is inserted through the maintenance hole 17 to the vehicle rear side so that the air filter 50 Can be replaced.

  As shown in FIG. 2, the upper frame 21 is installed at the lower part of the upper swing body 20, and the cab 14, the machine room 15, and the like are arranged on the upper frame 21. The upper frame 21 is provided with a bottom plate 22, a pair of vertical plates 23, a cross beam 24, a pedestal 25, and the like.

  A cab 14 is installed at the left corner on the front side of the bottom plate 22. Although illustration is omitted, a turning mechanism is provided at a front portion in the middle of the width direction of the bottom plate 22, and the bottom plate 22 is supported by the lower traveling body 11 so as to be turnable by this turning mechanism.

  The pair of vertical plates 23 extend in parallel in the front-rear direction from the front end portion to the rear end portion of the bottom plate 22 in the middle portion of the bottom plate 22 in the left-right width direction. The vertical plate 23 is erected so as to be welded to the bottom plate 22 and orthogonal to the bottom plate 22. Between the pair of vertical plates 23, the boom 13a of the attachment 13 is rotatably supported. The vertical plate 23 is provided with a pedestal 25 for the engine 35.

  The cross beam 24 is disposed so as to extend in the width direction from the left end portion to the right end portion of the bottom plate 22 in the middle portion of the bottom plate 22 in the front-rear direction, and is integrally joined to the bottom plate 22 and each vertical plate 23.

  As shown in FIG. 3, the engine 35 is installed on the pedestal 25 via a vibration isolator 35a. The engine 35 is accommodated in the machine room 15 so that the drive shaft thereof faces in the left-right direction of the bottom plate 22. An intake port 16 a for taking outside air into the machine room 15 is formed in the upper left part of the machine room cover 16. An exhaust port 16 b for exhausting the taken-in outside air is formed in the upper right portion of the machine room cover 16.

  Inside the machine room 15, in addition to the engine 35, a hydraulic pump 36, first to third heat exchangers 31, 32, 33 arranged in the longitudinal direction of the vehicle, a fan 34, an intake duct 40, and the like are accommodated. ing. In this construction machine 10, an intake duct 40, first to third heat exchangers 31, 32, 33, a fan 34, an engine 35, and a hydraulic pump 36 are arranged side by side in order from the upstream side in the air flow direction. ing.

  The first to third heat exchangers 31, 32, and 33 are formed in a vertically long rectangular shape, and are arranged in parallel in the width direction. Since the first to third heat exchangers 31, 32, and 33 are disposed such that the core surfaces face the vehicle width direction, the first to third heat exchangers 31, 32, and 33 They are arranged in the front-rear direction.

  The first heat exchanger 31 is an engine cooling radiator. The cooling water flowing into the first heat exchanger 31 is heat-exchanged with the outside air taken in from the intake port 16a.

  The second heat exchanger 32 is an oil cooler for cooling the hydraulic oil, and is arranged in front of the vehicle with respect to the first heat exchanger 31. The hydraulic oil that has flowed into the second heat exchanger 32 is heat-exchanged with the outside air taken in from the intake port 16a.

  The third heat exchanger 33 is a turbocharger intercooler, and is arranged in parallel to the rear of the vehicle with respect to the first heat exchanger 31. Compressed air compressed by a supercharger (not shown) flows into the third heat exchanger 33. The compressed air that has flowed into the third heat exchanger 33 is heat-exchanged with the outside air taken in from the intake port 16a.

  The fan 34 is connected to the left end of the drive shaft of the engine 35 and is disposed between the engine 35 and the first to third heat exchangers 31, 32, 33. The hydraulic pump 36 is connected to the right end portion of the drive shaft of the engine 35 and is located on the right side portion of the machine room 15.

  The fan 34 sucks outside air from the intake port 16a and circulates it into the machine room 15 as cooling air. The cooling air sucked by the fan 34 passes through the first to third heat exchangers 31, 32, and 33, and at this time, the cooling water and the hydraulic oil are cooled. The cooling air after heat exchange is exhausted to the outside through the exhaust port 16b after cooling the engine 35 and the like.

  As shown by the arrow line in FIG. 3, in the construction machine 10, when the engine 35 is driven, an air flow from the left side to the right side is formed inside the machine room 15, and the first to third heat exchangers 31 are formed. 32, 33, the engine 35 and the like are cooled by the refrigerant that exchanges heat with the air. Specifically, air is taken into the machine chamber 15 from the intake port 16 a by the rotation of the fan 34. The taken-in air passes through the first to third heat exchangers 31, 32, 33 and absorbs the heat of the refrigerant flowing through the first to third heat exchangers 31, 32, 33 to become hot air. It is discharged out of the machine room 15 through the port 16b.

  As shown in FIG. 4, the intake duct 40 includes a box-shaped duct body 41 that opens from the upstream side to the downstream side in the air flow direction. The duct main body 41 is provided with an air filter holding portion 42 that detachably holds the air filter 50. The air filter holding unit 42 detachably holds the air filter 50 in a posture in which the filter surface of the air filter 50 faces the core surfaces of the first to third heat exchangers 31, 32, and 33.

  The air filter 50 collects dust contained in the outside air taken into the machine room 15, and includes a filter frame 51 formed in a horizontally long rectangular shape, and a filter provided in the frame of the filter frame 51. Part 52. The air filter 50 is disposed so that the filter surface of the filter portion 52 faces the vehicle width direction. The filter portion 52 is bent in a zigzag shape in the vehicle width direction, thereby forming a bellows shape in which a plurality of triangles are continuous in the width direction of the air filter 50 (vehicle longitudinal direction) in plan view (see FIG. 8).

  The air filter holding part 42 is provided in the opening part of the upstream side of the duct main body 41, and the air filter 50 is attached detachably. Specifically, the air filter holding part 42 includes a pair of guide plates 43 disposed along the upper and lower surfaces of the air filter 50, a sandwiching plate 44 (a sandwiching member) disposed on the front side of the vehicle, and a vehicle. And a locking member 60 disposed on the rear side.

  The pair of guide plates 43 accommodates the air filter 50 therebetween. Further, the pair of guide plates 43 function as guides when the air filter 50 is inserted through the maintenance hole 17 of the machine room cover 16. Further, the guide plate 43 is configured in an L shape with a plate portion protruding toward the filter side on the downstream side, and the plate portion indicates that the air filter 50 moves to the heat exchanger side when the air filter 50 is inserted. Suppress.

  The clamping plate 44 contacts the side wall surface of the air filter 50 on the vehicle front side, so that the air filter 50 is positioned in the depth direction. Further, the vehicle left end of the sandwiching plate 44 is bent toward the vehicle rear side, and the bent portion comes into contact with the vehicle left surface of the air filter 50, whereby the air filter 50 is positioned in the thickness direction.

  The lock member 60 abuts against the side wall surface of the air filter 50 on the vehicle rear side, thereby releasing the lock position where the air filter 50 is pinched between the holding plate 44 and the air filter 50 from being held. The filter 50 can be opened and closed with an unlock position where the filter 50 can be taken out. The specific configuration of the lock member 60 will be described later.

  By the way, when working with the construction machine 10 in a cold region where the outside air temperature is below freezing point, the refrigerant of the first to third heat exchangers 31, 32, 33 that exchanges heat with the outside air, that is, the radiator Cooling water, hydraulic oil of the oil cooler, and compressed air of the intercooler may be overcooled.

  Therefore, in the present embodiment, a part of the filter surface of the air filter 50 is shielded to adjust the air volume of the outside air that passes through the first to third heat exchangers 31, 32, 33, and to perform supercooling. I try to suppress it.

  Specifically, as shown in FIGS. 5 to 7, a shielding member 55 is detachably attached to the air filter 50. The shielding member 55 includes a plate-like shielding portion 56 that shields at least a part of the filter surface of the air filter 50, an engaging portion 57 that is integrally formed by bending the upper edge portion of the shielding portion 56, and the shielding portion 56. And a contact portion 58 integrally formed by bending the side edge portion on the vehicle rear side.

  The shielding portion 56 is disposed on the upstream side of the air filter 50 in the air flow direction, and extends in the vertical direction to a position where it abuts on the upper end portion and the lower end portion of the filter frame 51 of the air filter 50. As a result, the shielding portion 56 is pressed against the air filter 50 by the outside air flowing toward the air filter 50 and is in close contact with the filter frame 51.

  Moreover, in this embodiment, the shielding part 56 sees from the air distribution | circulation direction, all the core surfaces of the 3rd heat exchanger 33 which is an intercooler, and the core surface of the 1st heat exchanger 31 which is a radiator. The vehicle extends in the vehicle longitudinal direction so as to overlap a part of the vehicle (see FIG. 8). Thereby, the air volume of the external air which goes to the 3rd heat exchanger 33 which is an intercooler decreases, and it can suppress that the compressed air of the 3rd heat exchanger 33 overcools in a cold region.

  The engaging portion 57 is formed in a concave cross-section that opens downward by bending the upper edge portion of the shielding portion 56 toward the right side of the vehicle and then bending downward. The horizontal surface of the engaging portion 57 has substantially the same length as the thickness of the filter frame 51 of the air filter 50, and the engaging portion 57 can be fitted into the upper edge portion of the filter frame 51 of the air filter 50.

  With such a configuration, when the shielding member 55 is retrofitted to the existing construction machine 10, the engaging portion 57 is connected to the filter frame 51 of the air filter 50 with respect to the air filter 50 removed for maintenance. Simply hook it onto the upper edge and engage. Therefore, attachment work can be easily performed without performing additional processing such as forming a screw hole on the air filter 50 side. Further, it is not necessary to secure a separate installation space for the shielding member 55 in the machine room 15.

  The contact portion 58 is formed by bending the side edge portion of the shielding portion 56 on the vehicle rear side toward the vehicle right side. The abutment portion 58 abuts against the side wall surface of the filter frame 51 of the air filter 50 on the vehicle rear side, thereby restricting the shielding member 55 from moving forward in the width direction of the air filter 50. . Thereby, positioning of the shielding member 55 with respect to the air filter 50 can be performed.

  Here, as shown in FIG. 4, when the air filter 50 is accommodated between the pair of guide plates 43 in a state where the shielding member 55 is detachably attached to the air filter 50, the upper guide plate 43 and the air filter 50. The horizontal plane of the engaging portion 57 is sandwiched between the filter frame 51 and the filter frame 51. Further, when the lock member 60 is in the lock position, the contact portion 58 is sandwiched between the clamping plate 44 and the lock member 60 together with the air filter 50. Thereby, shakiness of the shielding member 55 can be suppressed, and there is no need to separately provide a fixture for fixing the shielding member 55 to the air filter 50.

  As shown in FIG. 9, the upper guide plate 43 is formed with a cutout hole 43a that opens to the vehicle rear side. On the upper surface of the air filter 50, a protruding plate 50a that is bent so as to protrude upward is attached. When the air filter 50 is accommodated between the pair of guide plates 43, the air filter 50 is positioned in the thickness direction by fitting the protruding plate 50 a into the notch hole 43 a of the guide plate 43.

  FIG. 10 is a perspective view showing a state where the lock member is moved to the lock position. As shown in FIG. 10, the lock member 60 includes a movable member 61 that comes into contact with the air filter 50, a shaft member 65 that is the rotation center of the movable member 61, and a holding member 68 that holds the shaft member 65. Yes.

  The movable member 61 includes a lock plate 62 that is bent so as to contact the side wall surface of the air filter 50 on the vehicle rear side and the upstream surface in the air flow direction, and an arm plate 63 that is integrally formed with the lock plate 62. Have The lock plate 62 and the arm plate 63 are formed by bending a single plate material. Specifically, the arm plate 63 includes a pair of upper and lower plate-like portions bent outward from both upper and lower edges of the surface of the lock plate 62 that contacts the side wall surface of the air filter 50.

  The lock plate 62 holds the air filter 50 between the holding plate 44 and fixes the air filter 50 by contacting the side wall surface of the air filter 50 on the vehicle rear side and the upstream surface in the air flow direction. The lock plate 62 rotates together with the arm plate 63 around a later-described center shaft portion 65a of the shaft member 65, thereby locking the air filter 50 and a lock release position for releasing the lock state of the air filter 50. It is possible to move between.

  The arm plate 63 is formed with a center shaft insertion hole 63a through which a later-described center shaft portion 65a of the shaft member 65 is inserted, and an engagement shaft insertion hole 63b through which an engagement shaft portion 65b described later is inserted. The central shaft insertion hole 63 a is formed so as to penetrate a pair of upper and lower plate-like portions of the arm plate 63. The engagement shaft insertion hole 63 b is formed in the plate-like portion on the upper side of the arm plate 63. A holding member 68 is disposed between a pair of upper and lower plate-like portions of the arm plate 63. A spacer member 69 is disposed between the upper plate-like portion of the arm plate 63 and the upper surface of the holding member 68.

  The shaft member 65 includes a central shaft portion 65a that is a rotation center of the movable member 61, and an engagement shaft portion 65b that extends in parallel with the central shaft portion 65a. The central shaft portion 65a and the engagement shaft portion 65b are formed by bending one shaft member, and the total length of the central shaft portion 65a is longer than the total length of the engagement shaft portion 65b. Stopper plates 66 are attached to the central shaft portion 65a above and below the arm plate 63, respectively. A force is applied between the lower stopper plate 66 and the lower surface of the arm plate 63 so that the upper stopper plate 66 contacts the upper surface of the arm plate 63, that is, the central shaft portion 65a moves downward. A compression spring 67 is provided.

  The holding member 68 is formed by bending a single plate material into a U-shape. The holding member 68 is formed with a holding hole 68a penetrating a pair of upper and lower plate-like portions formed by bending and an engagement hole 68b formed by cutting out the upper plate-like portion. The central shaft portion 65a of the shaft member 65 is held in the holding hole 68a so as to be movable in the axial direction. Here, when the central shaft portion 65a is moved in the axial direction, the engagement shaft portion 65b is moved in the axial direction in conjunction with it. By this advance / retreat operation, the engagement shaft portion 65b is freely engageable with the engagement hole 68b.

-Locking or unlocking procedure of locking member-
Next, a procedure for locking or unlocking the lock member 60 will be described with reference to FIGS. 10 and 11. As shown in FIG. 10, the lock plate 62 of the movable member 61 is in contact with the side wall surface on the vehicle rear side and the upstream surface of the air filter 50. Thereby, the air filter 50 is clamped between the clamping plate 44 and the lock plate 62. At this time, the contact portion 58 of the shielding member 55 is clamped between the clamping plate 44 and the lock plate 62 together with the air filter 50.

  Then, in this locked position, the engaging shaft portion 65 b of the shaft member 65 is engaged with the engaging hole 68 b of the holding member 68, thereby restricting the rotation operation of the movable member 61. At this time, since the engagement shaft portion 65b is biased so as to move downward by the biasing force of the compression spring 67, the engagement shaft portion 65b does not unintentionally come out of the engagement hole 68b. . Accordingly, the movable member 61 can be fixed at the lock position, and the air filter 50 can be attached to the air filter holding portion 42 of the intake duct 40.

  On the other hand, when removing the air filter 50 from the air filter holding portion 42, first, as shown in FIG. 11, the engagement shaft portion 65 b of the shaft member 65 is moved upward against the urging force of the compression spring 67. . That is, the lower end portion of the engagement shaft portion 65b is pulled up to a position above the upper surface of the holding member 68, and the engagement state between the engagement shaft portion 65b and the engagement hole 68b is released. Thereby, the rotation operation of the movable member 61 is allowed. Then, by rotating the movable member 61 about the central shaft portion 65a and moving it to the unlock position, the contact state between the lock plate 62 of the movable member 61 and the side wall surface of the air filter 50 on the vehicle rear side is changed. To release.

  As a result, the vehicle rear side of the air filter holding portion 42 opens, so that the air filter 50 can be pulled out along the pair of guide plates 43 to the vehicle rear side and smoothly taken out from the maintenance hole 17.

<< Embodiment 2 >>
As shown in FIGS. 12 and 13, the shielding member 75 is integrally formed by bending the shielding portion 76 that shields the filter surface of the air filter 50 and the upper edge portion of the frame portion 81 of the shielding portion 76. Part 77 and a contact part 78 formed integrally by bending the side edge part of the frame part 81 of the shielding part 76 on the vehicle rear side.

  The shielding part 76 includes a frame part 81 extending along the filter frame 51 of the air filter 50 and a shutter part 80 that covers the opening of the frame part 81 so as to be opened and closed.

  Support frames 82 are provided on the upper and lower edge portions of the frame portion 81 so as to project toward the upstream side in the air flow direction. The upper and lower support frames 82 are connected to each other by connecting frames 83 erected on both ends in the vehicle front-rear direction.

  The shutter portion 80 is formed of a plate-like member extending in the vertical direction, and a plurality of shutter portions 80 are disposed between the upper and lower support frames 82 and spaced in the vehicle front-rear direction. The shutter portion 80 is attached so as to be rotatable about a central axis 84 extending over the upper and lower support frames 82. Thereby, the shutter part 80 becomes movable between the closed position (see FIG. 13) that shields the filter surface of the air filter 50 and the open position (see FIG. 12) that exposes the filter surface of the air filter 50. ing.

  The shielding member 75 is provided with a switching unit 70 that switches the shutter unit 80 between a closed position and an open position. The switching unit 70 includes a switching lever 71 that extends in the vehicle front-rear direction and a link shaft 72 that moves the shutter unit 80 in conjunction with the switching operation of the switching lever 71.

  The switching lever 71 is formed of a plate-like member bent into an L-shaped cross section. At a position near the vehicle rear side (right side in FIG. 12) in the switching lever 71, a gripping portion 71 a that partially protrudes upward is provided. The grip portion 71a is a portion that the operator grips when the switching lever 71 is slid in the vehicle front-rear direction.

  A link shaft support portion 73 is provided at a substantially central position in the vertical direction of the shutter portion 80. The link shaft support part 73 is formed of a plate-like member bent into an L-shaped cross section. The standing surface of the link shaft support portion 73 is attached to the plate surface of the shutter portion 80. A link shaft 72 is provided on the horizontal plane of the link shaft support portion 73.

  The switching lever 71 is supported by the link shaft 72, and the shutter unit 80 opens and closes via the link shaft 72 in conjunction with the switching operation of sliding the switching lever 71 in the vehicle front-rear direction. Specifically, when the switching lever 71 is slid rearward of the vehicle, the shutter unit 80 moves to the open position (see FIG. 12). On the other hand, when the switching lever 71 is slid forward of the vehicle, the shutter unit 80 moves to the closed position (see FIG. 13).

  Thus, by configuring the shielding member 75 with the shutter unit 80 that can be opened and closed, it is possible to selectively switch whether or not the first to third heat exchangers 31, 32, and 33 are cooled by the outside air. . That is, in a cold region, by positioning the shutter unit 80 in the closed position, it is possible to block outside air and suppress overcooling of the first to third heat exchangers 31, 32, and 33. On the other hand, in a normal working environment that is not a cold region, the first to third heat exchangers 31, 32, and 33 can be cooled by taking in outside air by positioning the shutter unit 80 in the open position.

  Further, since the link shafts 72 are respectively provided for the plurality of shutter portions 80, the plurality of shutter portions 80 can be simultaneously opened and closed by sliding the switching lever 71 in the vehicle front-rear direction.

  As shown in FIG. 14, two insertion holes 82 a are formed at a position closer to the rear side of the vehicle in the lower support frame 82 with an interval in the vehicle front-rear direction. A regulating member 85 is inserted through the insertion hole 82a. The restriction member 85 is formed by bending a rod-like member into a U-shaped cross section, and two shaft portions of the restriction member 85 are inserted from above into the insertion hole 82a.

  Accordingly, when the shutter unit 80 is in the closed position, the shutter unit 80 interferes with the regulating member 85, and thus the shutter unit 80 is regulated so as not to open. Here, since the plurality of shutter portions 80 are connected to each other by the switching lever 71, the other shutter portions 80 are not opened unless one shutter portion 80 is opened.

  As shown in FIG. 15, the shutter portion 80 disposed in the vicinity of the insertion hole 82 a is provided with an overhang portion 86 that projects in the horizontal direction at the lower end portion of the shutter portion 80. An engagement hole 86 a is formed in the overhang portion 86. When the shutter portion 80 is in the open position, the two shaft portions of the restriction member 85 are inserted through the insertion hole 82a and the engagement hole 86a from above. Thereby, the shutter part 80 is regulated so as not to close. Here, since the plurality of shutter portions 80 are connected to each other by the switching lever 71, the other shutter portions 80 are not closed unless one shutter portion 80 is closed.

  Accordingly, it is possible to avoid the problem that the shutter unit 80 is unintentionally opened and closed due to vibration or the like, and the first to third heat exchangers 31, 32, and 33 are not cooled or overcooled. it can.

<< Embodiment 3 >>
FIG. 16 is a perspective view when the shutter portion of the shielding member according to the third embodiment is in the closed position. Hereinafter, the same parts as those of the second embodiment are denoted by the same reference numerals, and only differences will be described.

  As shown in FIG. 16, the shielding member 75 includes a shielding part 76 that shields the filter surface of the air filter 50, an engaging part 77 that can be attached to and detached from the upper edge part of the frame part 81 of the shielding part 76, and a shield. The contact portion 78 formed integrally by bending the side edge portion of the frame portion 81 of the portion 76 on the vehicle rear side, and the support portion 79 formed integrally by bending the lower edge portion of the frame portion 81 of the shielding portion 76. And have. The right edge portion of the support portion 79 is bent upward, and the lower edge portion of the air filter 50 can be fitted between the frame portion 81 (see FIG. 18).

  As shown also in FIG. 17, the engaging part 77 is formed of a plate material bent into a concave cross section so that the lower part is opened. Two claw holes 77a are formed at the corner of the bent portion on the left side of the vehicle in the engaging portion 77 with a space in the vehicle front-rear direction.

  Two claw portions 81 a that protrude upward and can be fitted into the claw holes 77 a are formed on the upper edge portion of the frame portion 81 of the shielding portion 76. Then, the engaging portion 77 is detachably attached to the shielding portion 76 by fitting the claw hole 77a of the engaging portion 77 into the claw portion 81a. At this time, since the engaging portion 77 is fitted to the upper edge portion of the air filter 50, the air filter 50 is sandwiched by the engaging portion 77 and the support portion 79, and the air filter 50 can be reliably held. it can. The claw portion 81a is preferably set to a height that does not protrude from the horizontal plane of the engaging portion 77 when fitted into the claw hole 77a.

  By the way, when the engaging part 77 is fixed to the frame part 81 of the shielding part 76 by, for example, a bolt, the bolt is loosened when the shielding member 75 is removed from the air filter 50 when the air filter 50 is maintained. For this purpose, a separate tool is required, which is troublesome.

  Therefore, in the present embodiment, in order to easily attach and detach the shielding member 75 from the air filter 50, a configuration in which the claw hole 77a is simply fitted into the claw portion 81a is employed. However, in this configuration, since the engaging portion 77 moves upward and is easily detached from the claw portion 81a, the air filter 50 is connected to the engaging portion 77 and the supporting portion of the shielding member 75 as shown in FIG. In a state of being sandwiched by 79, it is accommodated between a pair of upper and lower guide plates 43. As a result, the upper guide plate 43 can restrict the engaging portion 77 from moving upward, thereby preventing the engaging portion 77 from coming off the frame portion 81.

  As shown in FIGS. 19 and 20, a regulating member 90 is provided at a position closer to the rear side of the vehicle in the lower support frame 82. The regulating member 90 includes a pressing portion 91 that presses the shutter portion 80, a supporting portion 92 that supports the pressing portion 91, a hinge portion 93 that rotates the pressing portion 91 and the supporting portion 92 around the hinge shaft 93a, and a pressing portion. And a biasing spring 94 that biases the portion 91 toward the shielding member 75.

  The pressing portion 91 is formed of an elastic body such as a rubber material. At the left end of the pressing portion 91 in FIG. 19, a grip portion 91 a is provided for the operator to grip. The support portion 92 is formed of a plate-like member that is bent so as to be inclined obliquely upward to the right in FIG. A pressing portion 91 is placed on the inclined surface of the support portion 92. The pressing portion 91 and the support portion 92 are fastened together with a fastening bolt 95 and a fastening nut 96.

  The hinge portion 93 includes a hinge shaft 93a extending in the vehicle front-rear direction and a pair of hinge plates 93b that can rotate around the hinge shaft 93a. The lower end part of the support part 92 is attached to one hinge board 93b. The other hinge plate 93 b is fixed to the lower surface of the support frame 82. Thereby, the pressing part 91 and the support part 92 can be rotated in the left-right direction in FIG. 19 around the hinge shaft 93a together with the hinge plate 93b.

  An urging spring 94 is inserted through the hinge shaft 93a. One end of the urging spring 94 is in contact with the left side surface of the hinge plate 93b to which the support 92 is attached in FIG. The other end of the urging spring 94 is in contact with the lower surface of the hinge plate 93 b fixed to the lower surface of the support frame 82. Accordingly, the hinge plate 93b to which the support portion 92 is attached is urged toward the shielding member 75 by the urging spring 94.

  As shown in FIG. 20, when the shutter unit 80 is in the closed position, the plate surface of the shutter unit 80 is pressed by the pressing unit 91 of the regulating member 90, and the shutter unit 80 is regulated so as not to open. Here, since the plurality of shutter portions 80 are connected to each other by the switching lever 71, the other shutter portions 80 are not opened unless one shutter portion 80 is opened.

  As shown in FIG. 21, when the shutter portion 80 is in the open position, the pressing portion 91 of the regulating member 90 is fitted between the adjacent shutter portions 80. As a result, the plate surface of the shutter unit 80 is in contact with the side surface of the pressing unit 91, and the shutter unit 80 is restricted from closing. Here, since the plurality of shutter portions 80 are connected to each other by the switching lever 71, the other shutter portions 80 are not closed unless one shutter portion 80 is closed.

  When the shutter 80 is opened and closed, the switching lever is released in a state where the restriction is released by pulling the pressing portion 91 of the restricting member 90 against the urging force of the urging spring 94 to the side opposite to the shielding member 75. 71 may be slid.

<< Other Embodiments >>
About the said embodiment, it is good also as following structures.

  In the first embodiment, in order to reduce the air volume of the outside air that flows toward the third heat exchanger 33 that is an intercooler, the third heat when the shielding portion 56 of the shielding member 55 is viewed from the air circulation direction. Although it arrange | positions so that it may overlap with the core surface of the exchanger 33, it is not limited to this form. For example, not only the third heat exchanger 33 but also the core surface of the second heat exchanger 32 that is an oil cooler may be overlapped, or the first to third heat exchangers 31, 32, and 33 may be overlapped. It may be made to overlap all the core surfaces.

  As described above, a plurality of shielding members 55 having different areas for shielding the filter surface of the air filter 50 are prepared, and the shielding member 55 is replaced according to the outside air temperature in the cold region, so that the outside air in the air filter 50 can be exchanged. If the distribution area is appropriately changed, the cooling performance of the heat exchanger can be adjusted.

  When the air filters 50 are arranged in two upper and lower stages, the shielding members 55 may be detachably attached to the two upper and lower air filters 50, respectively. At this time, the area of the shielding part 56 of the shielding member 55 may be the same in both the upper and lower stages, or the cooling performance may be adjusted by using different areas.

  Further, in the first embodiment, the shielding member 55 is detachably attached to the air filter 50 by engaging the engaging portion 57 of the shielding member 55 with the upper edge portion of the filter frame 51 of the air filter 50. However, for example, a fitting portion corresponding to the bellows shape of the filter portion 52 of the air filter 50 is provided in the shielding portion 56 of the shielding member 55, and the fitting portion is fitted into the bellows portion of the filter portion 52. The shielding member 55 may be detachably attached to the air filter 50.

  In the first and second embodiments, the engagement portion 57 of the shielding member 55 is engaged with the upper edge portion of the filter frame 51 of the air filter 50, and the contact portion 58 is the side wall surface of the filter frame 51 on the vehicle rear side. However, the present invention is not limited to this form. For example, the engaging portion 57 is integrally formed with the shielding portion 56 so as to engage with the side wall surface of the filter frame 51 on the vehicle rear side, and the contact portion 58 is orthogonal to the surface with which the engaging portion 57 is engaged. You may integrally form in the shielding part 56 so that it may contact | abut on a wall surface, ie, the upper surface of the filter frame 51. FIG. In this case, the contact member 58 can restrict the movement of the shielding member 55 downward.

  In the second embodiment, the entire filter surface of the air filter 50 is covered so as to be openable / closable, but at least a part of the filter surface of the air filter 50 may be covered so as to be openable / closable.

  As described above, the present invention is extremely useful and industrial because it provides a highly practical effect that the refrigerant of the heat exchanger can be prevented from being supercooled with a relatively simple configuration. The availability of is high.

DESCRIPTION OF SYMBOLS 10 Construction machine 11 Lower traveling body 15 Machine room 16 Machine room cover 20 Upper turning body 31 1st heat exchanger 32 2nd heat exchanger 33 3rd heat exchanger 34 Fan 42 Air filter holding | maintenance part 44 Clamping plate ( Clamping member)
DESCRIPTION OF SYMBOLS 50 Air filter 55 Shield member 56 Shield part 57 Engagement part 58 Contact part 60 Lock member 70 Switching part 75 Shield member 76 Shield part 77 Engagement part 80 Shutter part 85 Restriction member 90 Restriction member

Claims (10)

A construction machine comprising a lower traveling body, an upper swing body mounted on the lower traveling body, and a machine room cover covering a machine room provided on the upper swing body,
A fan for taking outside air into the machine room;
An air filter for collecting dust contained in the outside air taken into the machine room;
A heat exchanger disposed downstream of the air filter in the air flow direction from the air filter;
An air filter holding part that holds the air filter in a detachable manner in a posture in which the filter surface of the air filter faces the core surface of the heat exchanger;
A construction machine comprising: a shielding member that is detachably attached to the air filter and shields at least a part of a filter surface of the air filter. In claim 1,
The shielding member includes a shielding portion that shields at least a part of a filter surface of the air filter, and an engaging portion that is integrally provided on the shielding portion and detachably engages with an outer peripheral edge portion of the air filter. Construction machine characterized by having. In claim 1,
The shielding member has a shielding part that shields at least a part of a filter surface of the air filter, and an engaging part that is detachable from the shielding part and engages with an outer peripheral edge of the air filter. Construction machine characterized by. In claim 2 or 3,
The construction machine according to claim 1, wherein the shielding member has an abutting portion that abuts against a wall surface orthogonal to a surface with which the engaging portion is engaged in an outer peripheral edge portion of the air filter. In claim 4,
The contact portion is in contact with the side wall surface in the width direction of the air filter,
The air filter holding part is
A clamping member that contacts the side wall surface on one end side in the width direction of the air filter;
A lock position where the air filter abuts against the side wall surface of the other end in the width direction of the air filter and clamps the air filter with the clamping member, and the air filter is released and the air filter is taken out. A lock member that can be opened and closed between possible unlock positions,
The construction machine according to claim 1, wherein, when the lock member is in the lock position, the abutting portion is sandwiched between the clamping member and the lock member together with the air filter. In any one of claims 2-5,
The construction machine according to claim 1, wherein the shielding portion of the shielding member is disposed upstream of the air filter in an air flow direction. In any one of claims 2 to 6,
A plurality of the heat exchangers are provided so as to be arranged in the width direction of the heat exchanger, and one of them is constituted by an intercooler for cooling the compressed air,
The construction machine characterized in that the shielding part of the shielding member overlaps at least the core surface of the intercooler when viewed from the air flow direction. In any one of claims 2-7,
The said shielding part has at least 1 shutter part movable between the closed position which shields the filter surface of the said air filter, and the open position which exposes the filter surface of this air filter, The construction machine characterized by the above-mentioned. . In claim 8,
The construction machine, wherein the shielding member includes a switching unit that switches the shutter unit between the closed position and the open position in conjunction with a predetermined switching operation. In claim 8 or 9,
A construction machine comprising a regulating member that regulates movement of the shutter portion between an open position and a closed position.

Images