Construction machinery

Abstract

To provide a construction machine capable of improving cooling efficiency of a heat exchanger and reducing noise for a configuration where an engine and the heat exchanger are placed in an engine room and surrounded with an external cover.SOLUTION: An excavation machine 1 is provided with: a revolving frame 7; an engine room 11 in which equipment including an engine 53 arranged in the revolving frame 7, a heat exchange unit 60, and a cooling fan 70 are accommodated; and an external cover covering the engine room 11. A vent part 80 is provided in a right external cover 14 forming a part of a side wall of the engine room 11 of the external cover, the vent part comprising a central plate part 81 placed to face a hub 72 of the cooling fan 70 at an opposite side of the cooling fan 70 over the heat exchange unit 60, and a plurality of vent openings arranged at an edge part of the central plate part 81 to communicate an internal part and an external part of the engine room 11.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a construction machine provided with an engine room in which a prime mover is disposed inside an exterior cover.

Background Art

[0002] Conventionally, in construction machines, an engine room for housing a prime mover is covered with a bonnet and an exterior cover. Further, a heat exchanger for cooling fluids such as engine cooling water and hydraulic oil is disposed in the engine room, and a ventilation port for taking in cooling air passing through the heat exchanger from the outside is provided in the exterior cover.

[0003] Patent Document 1 discloses an example in which a plurality of louver plates are provided at a ventilation port for cooling air provided in an exterior cover of a vehicle body. Such louver plates are for preventing objects such as dead leaves from entering the engine room.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the construction machine disclosed in Patent Document 1, as a configuration for cooling a prime mover, a heat exchanger and a cooling fan for drawing outside air passing through the heat exchanger into the engine room are disposed. The operating sounds of the prime mover and the cooling fan are blocked by the exterior cover. However, if the intervals between a plurality of louver plates provided in the exterior cover are large, the sound in the engine room leaks to the outside, and the noise during the operation of the construction machine becomes a problem. On the other hand, if the intervals between a plurality of louver plates provided in the exterior cover are small, the amount of outside air taken into the engine room becomes insufficient, and there arises a problem that the cooling efficiency of the heat exchanger decreases.

[0006] The present invention has been made in view of the above problems, and in a configuration where a prime mover and a heat exchanger are arranged in an engine room and surrounded by an exterior cover, an object thereof is to provide a construction machine capable of improving the cooling efficiency of the heat exchanger and reducing noise.

Means for Solving the Problems

[0007] The construction machine according to the present invention includes a vehicle body frame, an engine room provided on the vehicle body frame and housing equipment including a prime mover, a heat exchanger, and a cooling fan that supplies cooling air to the heat exchanger, and an exterior cover that covers the engine room. In a side cover that forms a side wall of the engine room among the exterior covers, a shielding plate portion is disposed so as to face the central portion of the cooling fan on the opposite side of the cooling fan with the heat exchanger interposed therebetween, and a plurality of ventilation openings that are provided adjacent to the shielding plate portion and communicate the inside and outside of the engine room are provided. A ventilation portion having these is provided.

[0008] In the construction machine according to another aspect of the present invention, in the ventilation portion, each of the plurality of ventilation openings is provided so as to surround the shielding plate portion.

[0009] In the construction machine according to another aspect of the present invention, at least one of the plurality of ventilation openings is arranged along the outer edge of the side cover.

[0010] In the construction machine according to another aspect of the present invention, each of the plurality of ventilation openings is a vertically long vertical opening and / or a horizontally long horizontal opening that is long in the front-rear direction.

[0011] In the construction machine according to another aspect of the present invention, the ventilation portion is provided with an adjustment plate that adjusts the flow of outside air flowing in from the ventilation opening in at least one of the plurality of ventilation openings.

[0012] The construction machine according to another aspect of the present invention, wherein the plurality of ventilation openings include upper ventilation openings provided above the shielding plate portion, and the adjustment plate is provided on the inner wall side of the side cover and at the upper edge of the opening of the upper ventilation openings, and is a wind guiding plate that adjusts the flow direction of outside air and guides the outside air to the heat exchanger.

[0013] The construction machine according to another aspect of the present invention, wherein the plurality of ventilation openings include lower ventilation openings provided below the shielding plate portion, front ventilation openings provided in front of the shielding plate portion, and rear ventilation openings provided behind the shielding plate portion, and the adjustment plate is provided on the inner wall side of the side cover and for at least one of the lower ventilation openings, the front ventilation openings, and the rear ventilation openings, and is a regulating plate that adjusts the opening area of the ventilation opening to adjust the amount of outside air flowing and restricts the air flow.

[0014] The construction machine according to another aspect of the present invention further includes a cooling fan provided between the prime mover and the heat exchanger, facing the heat exchanger, and drawing outside air from the plurality of ventilation openings into the engine room.

Advantages of the Invention

[0015] According to the present invention, in a configuration where the engine room in which the prime mover and the heat exchanger are arranged is surrounded by an exterior cover, it is possible to improve the cooling efficiency of the heat exchanger and reduce noise.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0017] The present invention is configured to surround the engine room with an exterior cover, aiming to improve the cooling efficiency and sound insulation of the heat exchanger arranged in the engine room. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0018] In an embodiment of the present invention, as a construction machine according to the present invention, an excavation work machine (excavator), which is a swing work vehicle, will be described as an example. However, the construction machine according to the present invention is not limited to the excavation work machine, and can be widely applied to other construction machines such as bulldozers, crane work machines, compact track loaders, skid steer loaders, wheel loaders, etc.

[0019] The overall configuration of the excavation work machine 1 according to this embodiment will be described with reference to FIGS. 1 and 2. As shown in FIGS. 1 and 2, the excavation work machine 1 includes a self - propelled traveling vehicle body (machine body) 2, an excavation device 3 and an earth - discharging device 4 as working devices attached to the traveling vehicle body 2.

[0020] The traveling vehicle body 2 has a pair of left - and - right crawler - type traveling parts 5, 5 and a body frame 6 as a base provided between the left - and - right traveling parts 5, 5.

[0021] The traveling part 5 has a configuration in which a crawler is wound around a sprocket, an idler, and a plurality of rollers supported by the body frame 6. The traveling part 5 has a drive sprocket 5a, which is a drive wheel, at its rear end.

[0022] An earth - discharging device 4 is attached to the front side of the body frame 6. The earth - discharging device 4 includes a support frame 40 and a blade 41, which is an earth - discharging plate supported by the support frame 40. The earth - discharging device 4 including these components is configured to be substantially left - right symmetric as a whole.

[0023] The support frame 40 is supported so as to be vertically rotatable with respect to the traveling vehicle body 2, and includes left and right arms 43 extending in the front-rear direction between the left and right traveling units 5, 5. The left and right arms 43 are supported such that the axial direction of rotation is the left-right direction with respect to a support bracket 42 provided at the front portion of the body frame 6 at their base ends. The support frame 40 rotates vertically by the expansion and contraction of the blade cylinder 44. That is, when the blade cylinder 44 expands and contracts, the blade 41 rotates vertically via the support frame 40.

[0024] The traveling vehicle body 2 has a slewing frame 7 mounted so as to be slewing rotatable with respect to the traveling unit 5. The slewing frame 7 is connected to the body frame 6 via a slewing bearing 8, and is provided so as to be slewing rotatable in either the left or right direction about a vertical axis with respect to the body frame 6 by the drive of a slewing motor (not shown).

[0025] An excavation device 3 is attached to the front side of the slewing frame 7. The excavation device 3 has a boom 32 constituting a base side portion thereof, an arm 33 connected to the tip side of the boom 32, and a bucket 34 attached to the tip end portion of the arm 33. Further, the excavation device 3 has a boom cylinder 35 that rotates the boom 32, an arm cylinder 36 that rotates the arm 33, and a bucket cylinder 37 that rotates the bucket 34.

[0026] The base end portion of the boom 32 is supported by a boom support bracket 31. The boom support bracket 31 is supported by a bracket attachment portion 28 protruding from the slewing frame 7 via a swing axis whose axial direction of rotation is the vertical direction.

[0027] The boom support bracket 31 has a boom support portion 22 that rotatably supports the base end of the boom 32 with the left - right direction as the rotation axis direction, a boom cylinder support portion 23 that supports the lower end of the boom cylinder 35, and a swing cylinder connection portion 25 that connects the tip of the rod of the swing cylinder 38. When the boom support bracket 31 rotates around the swing axis due to the operation of the swing cylinder 38, the excavation device 3 rotates left and right.

[0028] The boom cylinder 35, the arm cylinder 36, the bucket cylinder 37, and the swing cylinder 38 are all hydraulic cylinders that operate by the pressure oil discharged from a hydraulic pump (not shown). In the excavation device 3, the bucket 34 is detachably attached as a working attachment, and other attachments such as a clamping machine (fork) or a crusher (breaker) can be attached in place of the bucket 34 according to the work content.

[0029] The slewing frame 7 is provided with a cabin 10 that houses the driving part for the operator to drive and operate the traveling part 5 and the working machine, and an engine room 11 that houses the engine 53, the battery 54, the fuel tank 51 for the engine, and the hydraulic oil tank 52 for the hydraulic cylinders.

[0030] The engine room 11 is provided on the slewing frame 7 from the right side to the rear of the cabin 10. The cabin 10 and the engine room 11 arranged in the front - left of the slewing frame 7 are partitioned by the rear wall 19 (see Figure 3) of the cabin 10 that slopes forward - low and rear - high at the rear of the slewing frame 7. The engine room 11 is covered by an exterior cover.

[0031] The exterior cover is composed of a plurality of members with different shapes and sizes according to the shape of the slewing frame 7 and the arrangement of the components on the slewing frame 7. Above the engine room 11 on the right side of the slewing frame 7 is covered by a bonnet 12 configured to be openable and closable. The rear of the engine room 11 is covered by a counterweight 9 for balancing the weight with the rear cover 13 and the excavating device 3. The right side surface of the engine room 11 on the slewing frame 7 is covered by a right exterior cover 14. The lower right part of the engine room 11 is covered by a lower right cover 15. The front right side of the engine room 11 is covered by a right front exterior cover 16. The lower left part of the cabin 10 is covered by a lower left exterior cover 17. The lower front side of the cabin 10 is covered by a front cover 18.

[0032] Inside the cabin 10, a driver's seat is provided, and around the driver's seat, a travel lever for driving the travel unit 5, a plurality of operation pedals for slewing the slewing frame 7 and operating the work machine, a work operation lever, and an operation panel section, etc. are provided.

[0033] In the excavating work machine 1 having the above configuration, by appropriately operating the travel lever and / or the work operation lever, etc. by the operator boarding the cabin 10, a desired operation / work is performed. For example, by operating the travel lever, the front - rear straight - ahead travel or the left - right slewing travel of the travel unit 5 is performed, and by operating the work operation lever, the excavating work by the excavating device 3, or the earth - discharging work and / or the leveling work by the earth - discharging device 4 are performed.

[0034] In the excavating work machine 1 according to the present embodiment, the arrangement of the configuration particularly related to the cooling mechanism in the engine room 11 on the slewing frame 7 will be described with reference to FIGS. 3 and 4. In FIG. 3, the illustration of the cabin 10, the excavating device 3, the attachment structure of the excavating device 3 to the slewing frame 7, the fuel tank, the hydraulic oil tank, the hydraulic hoses, and the wiring, etc. is omitted. In the plan view shown in FIG. 4, the main configurations arranged on the slewing frame 7 are shown in a simplified manner.

[0035] The engine room 11 is formed as a space that uses the bottom plate of the slewing frame 7 as the floor, with its right side covered by a right exterior cover 14 whose right side is the side cover of the slewing frame 7, and its upper part covered by a bonnet 12 and its rear part covered by a rear cover 13. In the engine room 11, a fuel tank 51, a hydraulic oil tank 52, an engine 53, a battery 54, a heat exchange unit 60, and a cooling fan 70 are arranged. The fuel tank 51 and the hydraulic oil tank 52 are arranged at the front right side of the slewing frame 7.

[0036] The engine 53 is a diesel engine that receives fuel supply from the fuel tank 51 and is arranged horizontally on the rear side of the slewing frame 7. The combustion gas generated in the combustion chamber of the engine 53 is discharged outside the engine room 11 through an exhaust device 55 and a muffler 56.

[0037] The heat exchange unit 60 and the cooling fan 70 are arranged on the right side of the engine 53 and at the rear right side of the slewing frame 7. As shown in FIG. 4, on the slewing frame 7, the engine 53, the cooling fan 70, and the heat exchange unit 60 are arranged in this order from the inside of the engine room 11 toward the right side. That is, the heat exchange unit 60 is arranged on the suction side of the air of the cooling fan 70, and the engine 53 is arranged on the discharge side of the air of the cooling fan 70. The battery 54 that stores electric power supplied to the electrical components mounted on the excavation work machine 1 is fixed to the bottom plate at the rear right side of the slewing frame 7 and to the right of the heat exchange unit 60.

[0038] The heat exchange unit 60 is composed of a radiator 61, an oil cooler 62, and a condenser 63.

[0039] The radiator 61 is a heat exchanger for cooling the engine cooling water, and includes a flow passage through which the cooling water flows and a heat radiation section. The radiator 61 is connected to a reserve tank 64 that stores the cooling water temporarily overflowing from the flow passage in the radiator 61. The oil cooler 62 is a heat exchanger for cooling the hydraulic oil that operates hydraulic cylinders and the like, and includes a flow passage through which the hydraulic oil flows and a heat radiation section. The oil cooler 62 cools the hydraulic oil returning to the hydraulic oil tank 52 by radiating the heat of the return oil from each hydraulic cylinder at the heat radiation section. Further, the condenser 63 is a heat exchanger for cooling the high-pressure refrigerant of an air conditioner (not shown) that conditions the air in the cabin 10, and is connected to a compressor (not shown).

[0040] The radiator 61 and the oil cooler 62 are arranged in series in a substantially front-rear direction. The condenser 63 is located on the right side of the radiator 61 and the oil cooler 62 and is arranged at a position facing the radiator 61 and the oil cooler 62.

[0041] The cooling fan 70 is arranged facing the heat exchange unit 60 and supplies cooling air to the heat exchangers that make up the heat exchange unit 60. The cooling fan 70 is an axial flow fan in which a plurality of blade portions 71 are attached to a cylindrical hub 72, and has a boss portion that is fitted into the rotating shaft of the electric motor at the center of the hub 72. The hub 72 forms the center of the cooling fan 70. The cooling fan 70 is attached, for example, by fitting the boss portion of the cooling fan 70 to one end side of the crankshaft of the engine 53 and attaching the hub 72 via a locking device, so that it rotates as the crankshaft rotates. By rotating the cooling fan 70, outside air for cooling is taken into the engine room 11 from each ventilation port 82, 83, 84, 85 formed in the right exterior cover 14, and the outside air is made to flow to the heat exchange unit 60.

[0042] Also, a fan shroud 73 is provided between the cooling fan 70 and the heat exchange unit 60. The fan shroud 73 is formed in a box shape that protrudes leftward from the radiator 61 and the oil cooler 62 of the heat exchange unit 60 and surrounds the cooling fan 70 from the outer peripheral side.

[0043] The right exterior cover 14 will be further described with reference to FIGS. 5 and 6. FIG. 5 is a front view of the right exterior cover 14, and FIG. 6 is a rear view thereof. In FIG. 5, the cooling fan 70 is shown by a phantom line.

[0044] The right exterior cover 14 is a side cover that covers the right side surface among the exterior covers that cover the engine room 11, and forms the side wall of the engine room 11. Further, the right exterior cover 14 has a rectangular shape in which the upper end portion inclines from the rear side toward the front side when viewed from the right side surface of the aircraft body. Furthermore, the right exterior cover 14 has an arcuate surface along the substantially circular outer shape of the swivel frame 7 (see FIG. 3). The arcuate surface of the right exterior cover 14 is provided with a ventilation portion 80 having a plurality of ventilation openings for allowing outside air to pass into the engine room 11.

[0045] The ventilation portion 80 is a region that occupies approximately one-half to two-thirds of the area on the rear side of the right exterior cover 14, and is provided at a position substantially opposite to the heat exchange unit 60 disposed in the engine room 11. The ventilation portion 80 is provided with a central plate portion 81 as a shielding plate portion that is provided on the opposite side of the cooling fan 70 with the heat exchange unit 60 interposed therebetween and is arranged to face the hub 72 that is the central portion of the cooling fan 70. Furthermore, the ventilation portion 80 is provided with a front ventilation opening 82, a rear ventilation opening 83, an upper ventilation opening 84, a lower ventilation opening 85, and an intermediate ventilation opening 86 that are provided so as to surround the substantially square central plate portion 81, and a partition portion 89 that is continuously provided on the central plate portion 81 and partitions each ventilation opening. The partition portion 89 extends substantially radially outward from the edge portion of the central plate portion 81 as shown in FIG. 5. Also, the outer edge portions of each ventilation opening are in contact with the frame portion 88, and the partition portion 89 connects the central plate portion 81 and the frame portion 88.

[0046] The central plate portion 81, the frame portion 88, and the partition portion 89 are integrally formed. The front vent 82 and the rear vent 83 are provided as openings on both sides in the front-rear direction of the central plate portion 81, respectively. The upper vent 84 and the lower vent 85 are provided as openings on both sides in the vertical direction of the central plate portion 81, respectively. That is, vents are provided at the upper edge portion, the lower edge portion, the right edge portion, and the left edge portion of the central plate portion 81, respectively. The space between the front vent 82 and the lower vent 85 is partitioned by a partition portion 89a. The space between the lower vent 85 and the rear vent 83 is partitioned by a partition portion 89b. The space between the rear vent 83 and the upper vent 84 is partitioned by a partition portion 89c.

[0047] The central plate portion 81 is arranged so as to substantially face the heat exchange unit 60 disposed in the engine room 11 in the right exterior cover 14. It is a shielding plate portion that hides the components in the engine room 11 (for example, the heat exchange unit 60 and the cooling fan 70) from the outside and shields the noise in the engine room 11. The central plate portion 81 has an area covering at least the cylindrical hub 72 to which the blades 71 of the cooling fan 70 are attached (see FIG. 5). Also, regarding the positional relationship between the central plate portion 81 and the cooling fan 70, the rotation axis of the cooling fan 70 is provided so as to be substantially orthogonal to the plate surface of the central plate portion 81. In other words, a part of the hub 72 and the blades 71, which are the central part of the cooling fan 70, are arranged so as to face the central plate portion 81, which is the shielding plate portion. In the case of the axial flow fan 70, the outer peripheral side can suck in outside air more efficiently than the vicinity of the rotation center of the fan. As shown in FIG. 5, most of the cooling fan 70 is arranged so as to be hidden by the central plate portion 81. For this reason, the central plate portion 81 also functions as a flow straightening plate that accelerates the wind speed of the outside air sucked in from each vent surrounding the central plate portion 81 in relation to the cooling fan 70.

[0048] The front vent 82 is a vertically long rectangular opening provided on the front side of the central plate portion 81, and has a substantially rectangular shape with the vertical direction being the longitudinal direction. The upper vent 84 is a horizontally long rectangular opening provided on the upper side of the central plate portion 81, and has a substantially rectangular shape with the front-rear direction being the longitudinal direction. One end on the short side of the front vent 82 and the upper vent 84 is continuously provided with the intermediate vent 86 therebetween. A reinforcing portion 87a is provided between the front vent 82 and the intermediate vent 86 for reinforcing the structure of the right exterior cover 14. Similarly, a reinforcing portion 87b is provided between the upper vent 84 and the intermediate vent 86. The front vent 82 and the intermediate vent 86 are separated from each other by the reinforcing portion 87a, and the upper vent 84 and the intermediate vent 86 are separated from each other by the reinforcing portion 87b. Thus, the front vent 82, the intermediate vent 86, and the upper vent 84 have a configuration in which the openings continuously provided in a substantially inverted L shape as a whole in a right side view are partitioned by the reinforcing portions 87a and 87b. The reinforcing portions 87a and 87b are partition portions that partition two adjacent vents, and are connected so as to bridge the central plate portion 81 and the frame portion 88.

[0049] The lower vent 85 is a vertically long rectangular opening provided on the lower side of the central plate portion 81, and has a substantially rectangular shape with the front-rear direction being the longitudinal direction. The rear vent 83 is a vertically long rectangular opening provided on the rear side of the central plate portion 81, and has a substantially rectangular shape with the vertical direction being the longitudinal direction. The rear vent 83 is separated into a first rear vent 83a and a second rear vent 83b by a reinforcing portion 87c. The lower vent 85 and the rear vent 83 have a configuration in which the openings continuously provided in a substantially L shape as a whole in a right side view are partitioned by a partition portion 89 that connects the central plate portion 81 and the frame portion 88 in the right exterior cover 14.

[0050] Each of the ventilation openings 82, 83, 84, 85, 86 has a different opening shape, and the substantially rectangular shape of each of the ventilation openings 82, 83, 84, 85, 86 includes a rhombus and / or a trapezoid. That is, the opening areas of the ventilation openings 82, 83, 84, 85, 86 do not necessarily have the same area. For a ventilation opening with an opening area wider than that of other ventilation openings, the opening area is adjusted by an adjustment plate described later.

[0051] Thus, the right exterior cover 14 is provided with a ventilation portion 80 having a plurality of ventilation openings 82, 83, 84, 85, 86. The ventilation portion 80 includes a central plate portion 81 provided via the plurality of ventilation openings 82, 83, 84, 85, 86 with respect to a cover main body portion 14a which is the main body portion of the right exterior cover 14, and a plurality of partition portions 89 which are installed between the central plate portion 81 and the cover main body portion 14a and form the plurality of ventilation openings 82, 83, 84, 85, 86 together with the central plate portion 81 and the cover main body portion 14a. Here, the cover main body portion 14a is the main body portion of the right exterior cover 14 including a frame portion 88.

[0052] The ventilation portion 80 has a plurality of adjustment plates for adjusting the air volume or direction of the outside air flowing into the engine room 11. As the adjustment plates, a first adjustment plate 91 is provided for the upper ventilation opening 84, a second adjustment plate 92 is provided for the rear ventilation opening 83, and a third adjustment plate 93 is provided for the lower ventilation opening 85, respectively.

[0053] The first adjustment plate 91 has a plate portion 94 and a fixing portion 95 that supports the plate portion 94 in an inclined manner and is fixed by screw fastening at a position that becomes the outer edge of the upper vent 84. The first adjustment plate 91 is provided on the inner wall side of the right exterior cover 14 and is fixed to the upper edge portion of the upper vent 84 via the fixing portion 95. The plate portion 94 has an area that can cover not only the upper vent 84 but also the intermediate vent 86, and the plate portion 94 is provided in a roof-like shape with respect to the openings of the upper vent 84 and the intermediate vent 86. Further, the first adjustment plate 91 adjusts the wind direction of the outside air mainly flowing in from the upper vent 84 and the intermediate vent 86 by adjusting the support inclination angle of the plate portion 94 with respect to the fixing portion 95. That is, the first adjustment plate 91 functions as a wind guide plate that guides the flow of the outside air to the heat exchange unit 60. By such wind direction adjustment, the outside air is efficiently sent into the heat exchange unit 60. Also, by making the inclination angle of the plate portion 94 with respect to the fixing portion 95 more obtuse, the opening area of the upper vent 84 and / or the intermediate vent 86 will also be restricted. Therefore, the first adjustment plate 91 also functions as a regulating plate that restricts the air flow by adjusting the opening area of the upper vent 84 in order to adjust the amount of the outside air flowing.

[0054] The second adjustment plate 92 is a long, substantially rectangular plate material, and is fixed by screw fastening to the central plate portion 81 side inside the right exterior cover 14 so as to cover the front side of the rear vent 83 with the vertical direction as the long direction. The second adjustment plate 92 adjusts the opening area of the rear vent 83 to about half. That is, the second adjustment plate 92 functions as a regulating plate that restricts the air flow by adjusting the opening area of the rear vent 83 in order to adjust the air volume of the outside air taken in from the rear vent 83.

[0055] The third adjustment plate 93 is a long, substantially rectangular plate material, and is fixed by screw fastening to the central plate portion 81 side inside the right exterior cover 14 so as to cover the upper side of the lower vent 83 with the front-rear direction as the long direction. The third adjustment plate 93 restricts the opening area of the lower vent 83 to about half. That is, the third adjustment plate 93 functions as a regulating plate that restricts the air flow by adjusting the opening area of the lower vent 83 in order to adjust the air volume of the outside air taken in from the lower vent 83.

[0056] The sizes and arrangements of the second adjusting plate 92 and the third adjusting plate 93 are adjusted so that the opening areas of the front vent 82, the lower vent 85, and the rear vent 83 are equal, allowing outside air to be taken in from any direction, i.e., up, down, front, or rear, of the central plate portion 81.

[0057] In addition, by providing the front vent 82, the rear vent 83, the upper vent 84, the lower vent 85, and the intermediate vent 86 so as to surround the central plate portion 81, the openings adjusted by the adjusting plates are provided approximately evenly at positions corresponding to the outer peripheral side of the cooling fan 70 that generates an air current for drawing in outside air. When the cooling fan 70 is driven, it is possible to efficiently take in outside air through each vent from the up, down, front, and rear directions of the cooling fan 70.

[0058] The first adjusting plate 91, the second adjusting plate 92, and the third adjusting plate 93 also function as sound insulation plates that block the noise generated by the driving of the engine 53 and the cooling fan 70 in the engine room 11. That is, by providing the adjusting plates 91, 92, and 93 at each vent to reduce the opening area, the noise leaking from the engine room 11 to the outside of the vehicle body is reduced.

[0059] Since the first adjusting plate 91, the second adjusting plate 92, and the third adjusting plate 93 are attached to the inner wall of the right exterior cover 14, they do not protrude outside the vehicle body like the louver plates attached to the exterior covers of conventional construction machinery. Therefore, the first adjusting plate 91, the second adjusting plate 92, and the third adjusting plate 93 are not damaged by external forces.

[0060] The excavation work machine 1 of the present embodiment having the above-described configuration can be said to have the following configuration. That is, the excavation work machine 1 includes a vehicle body frame (swivel frame 7), an engine room 11 provided on the vehicle body frame (swivel frame 7) and accommodating equipment including a prime mover (engine 53), a heat exchanger (heat exchange unit 60), and a cooling fan 70 that supplies cooling air to the heat exchanger, and an exterior cover that covers the engine room 11. On a side cover (right exterior cover 14) that forms a side wall of the engine room 11 among the exterior covers, a shielding plate portion (central plate portion 81) is disposed so as to face the central portion (hub 72) of the cooling fan 70 on the opposite side of the cooling fan 70 with the heat exchange unit 60 interposed therebetween, and a ventilation portion 80 having a plurality of ventilation openings (ventilation openings 82, 83, 84, 85) that are provided adjacent to the shielding plate portion (central plate portion 81) and communicate the inside and the outside of the engine room 11 is provided.

[0061] Further, the ventilation portion 80 is provided with a plurality of partition portions 89 that are continuously provided at the edge of the shielding plate portion (central plate portion 81) and partition between the plurality of ventilation openings.

[0062] Also, the right exterior cover 14 can be said to have the following configuration. That is, in the ventilation portion 80, each of the plurality of ventilation openings is provided so as to surround the shielding plate portion (central plate portion 81).

[0063] Further, at least one (rear ventilation opening 83) of the plurality of ventilation openings is arranged along the outer edge of the side cover (right exterior cover 14).

[0064] Each of the plurality of ventilation openings is a vertically long opening that is long in the vertical direction and / or a horizontally long opening that is long in the front-rear direction. That is, among the plurality of ventilation openings, the upper ventilation opening 84 and the lower ventilation opening 85 are horizontally long openings that are long in the front-rear direction, and the front ventilation opening 82 and the rear ventilation opening 83 are vertically long openings that are long in the vertical direction. Note that the number of ventilation openings is not limited to four, and at least two are sufficient. When two ventilation openings are provided, any of the following forms can be adopted: a form in which vertically long openings are combined, such as the upper ventilation opening 84 and the lower ventilation opening 85, the front ventilation opening 82 and the rear ventilation opening 83, the upper ventilation opening 84 and the front ventilation opening 82, the upper ventilation opening 84 and the rear ventilation opening 83, the rear ventilation opening 83 and the lower ventilation opening 85; a form in which horizontally long openings are combined; or a form in which a vertically long opening and a horizontally long opening are combined.

[0065] According to the above configuration, while the central plate portion 81 blocks the noise in the engine room 11, outside air can be efficiently introduced into the engine room 11 from the plurality of ventilation openings, and the heat exchanger can be sufficiently cooled.

[0066] Further, the ventilation portion 80 is provided with adjustment plates (first adjustment plate 91, second adjustment plate 92, third adjustment plate 93) for adjusting the intake state of the outside air flowing into at least one of the plurality of ventilation openings from the ventilation opening. The flow of the outside air adjusted by the first adjustment plate 91, the second adjustment plate 92, and the third adjustment plate 93 includes at least the direction (wind direction) in which the outside air flows and the amount (air volume) of the outside air flowing. The upper ventilation opening 84 provided above the central plate portion 81 is provided with the first adjustment plate 91 as a wind guide plate that mainly adjusts the wind direction of the outside air and guides the outside air in a predetermined direction. The lower ventilation opening 85 provided below the central plate portion 81 is provided with the second adjustment plate 92 as a regulating plate mainly for regulating the opening area of each ventilation opening, and the rear ventilation opening 83 is provided with the third adjustment plate 93 as a regulating plate in the same manner.

[0067] With such an arrangement of the plurality of ventilation openings and the first adjustment plate 91, the second adjustment plate 92, and the third adjustment plate 93, it is possible to efficiently send outside air to the heat exchange unit 60 arranged in the engine room 11, prevent the noise from the engine 53 from leaking outside the machine body, and realize a reduction in the noise of the excavation work machine 1.

[0068] Further, the excavation work machine 1 of the present embodiment has an axial flow fan in which the cooling fan 70 draws outside air into the engine room 11 from a plurality of ventilation ports, and is provided between the prime mover (engine 53) and the heat exchanger (heat exchange unit 60) and faces the heat exchanger (heat exchange unit 60).

[0069] The ventilation part 80 is provided in a region facing the heat exchange unit 60 of the right exterior cover 14. Between the heat exchange unit 60 and the engine 53, the cooling fan 70 is provided facing the heat exchange unit 60. Therefore, the cooling fan 70 is arranged to face the ventilation part 80 with the heat exchange unit 60 interposed therebetween. Further, the shielding plate part (central plate part 81) of the ventilation part 80 is arranged to face the central part (hub 72) of the cooling fan 70. For this reason, by driving the cooling fan 70, outside air can be efficiently sent into the heat exchange unit 60 arranged in the engine room 11 from each ventilation port, and the driving noise of the cooling fan 70 can be blocked by the central plate part 81. Therefore, the excavation work machine 1 can be made quieter.

[0070] The description of the above-described embodiment is an example of the present invention, and the construction machine according to the present invention is not limited to the above-described embodiment. Therefore, even outside the above-described embodiment, various modifications can be made according to the design and the like as long as the technical idea according to the present invention is not deviated from. Also, the effects described in the present disclosure are merely examples and are not limited, and there may be other effects.

[0071] In the above-described embodiment, the second adjusting plate 92 and the third adjusting plate 93 are provided as regulating plates for regulating the opening areas of the lower vent 85 and the rear vent 83, but the present invention is not limited thereto. Construction machines such as the excavation work machine 1 can be equipped with engines having different rated outputs in order to achieve an output according to the content of the work. Therefore, when it is desired to reduce the total opening area (total opening area) of each vent according to the rated output of the engine 53, the second adjusting plate 92 and the third adjusting plate 93 can be made even larger to reduce the opening area of each of the lower vent 85 and the rear vent 83, and a fourth adjusting plate may also be provided at the front vent 82. Further, when it is desired to increase the total opening area (total opening area) of each vent according to the rated output of the engine 53, the third adjusting plate 93 can be removed, and the opening area of each of the lower vent and the rear vent can be increased by replacing the second adjusting plate 92 with a smaller one. That is, the size and arrangement of the regulating plate are appropriately changed according to the rated output of the engine 53 and the like.

[0072] In the above-described embodiment, a plurality of vents are provided so as to surround the central plate portion 81. However, for example, the front vent 82 may be closed. A plurality of vents may be arranged in a positional relationship that can create an air flow inside and outside the engine room 11. From the viewpoints of ventilation efficiency and sound insulation of the engine room 11, the number and arrangement of the vents can be appropriately changed.

[0073] In the above-described embodiment, a diesel engine is adopted as the prime mover, but the present invention is not limited thereto. As the prime mover, it is also possible to adopt an electric motor that is driven by receiving power supply from a commercial power source or a storage battery mounted on the vehicle body frame.

Explanation of Reference Numerals

[0074] 1 Excavation work machine (construction machine) 2 Traveling vehicle body 5 Traveling section 7 Swing frame (vehicle body frame) 10 Cabin 11 Engine room 12 Bonnet 14 Right exterior cover (side cover) 53 Engine (prime mover) 60 Heat exchange unit (heat exchanger) 61 Radiator (heat exchanger) 62 Oil cooler (heat exchanger) 70 Cooling fan 72 Hub (central part) 80 Ventilation part 81 Central plate part (shielding plate part) 82 Front ventilation port 83 Rear ventilation port 84 Upper ventilation port 85 Lower ventilation port 87 Reinforcement part 88 Frame part 89 Partition part 91 First adjustment plate (air guide plate) 92 Second adjustment plate (restricting plate) 93 Third adjustment plate (restricting plate)

Claims

1. A vehicle body frame, An engine room provided on the vehicle body frame and containing equipment including a prime mover, a heat exchanger, and a cooling fan for supplying cooling air to the heat exchanger, An exterior cover covering the engine room, and on a side surface cover forming a part of a side wall of the engine room among the exterior covers, a shielding plate portion arranged to face the central portion of the cooling fan on the side opposite to the cooling fan with the heat exchanger interposed therebetween, a plurality of ventilation openings provided so as to surround the shielding plate portion and the cooling fan and arranged to face the heat exchanger, and a ventilation portion having the same is provided. A construction machine characterized by the above.

2. The cooling fan is arranged so as to overlap with the shielding plate portion with the heat exchanger interposed therebetween in a left - right direction view of the vehicle body frame. The construction machine according to Claim 1.

3. The cooling fan has a plurality of blade portions, and at least one end of the plurality of blade portions is arranged so as to overlap with any one of the plurality of ventilation openings with the heat exchanger interposed therebetween. The construction machine according to Claim 1 or Claim 2.

4. Each of the plurality of ventilation openings is a vertically long vertical opening and / or a horizontally long horizontal opening long in the front - rear direction. The construction machine according to any one of Claims 1 to 3.

5. The ventilation portion is provided with an adjustment plate for adjusting the flow of outside air flowing in from the ventilation opening in at least one of the plurality of ventilation openings. The construction machine according to any one of Claims 1 to 4.

6. The plurality of ventilation openings include upper ventilation openings provided above the shielding plate portion, The adjustment plate is provided on the inner wall side of the side cover at the upper edge of the opening of the upper vent, and is a wind guide plate that adjusts the flow direction of the outside air and guides the outside air to the heat exchanger. The construction machine according to claim 5.

7. The plurality of vents include a lower vent provided below the shielding plate portion, a front vent provided in front of the shielding plate portion, and a rear vent provided behind the shielding plate portion. The adjustment plate is provided on the inner wall side of the side cover with respect to at least one of the lower vent, the front vent, and the rear vent, and is a restricting plate that adjusts the opening area of the vent to restrict the air flow. The construction machine according to claim 5 or claim 6.

Images