WO2022176432A1

WO2022176432A1 - Construction machine

Info

Publication number: WO2022176432A1
Application number: PCT/JP2022/000501
Authority: WO
Inventors: 講介中嶋; 覚郎大塚; 章平鈴木
Original assignee: 日立建機株式会社
Priority date: 2021-02-22
Filing date: 2022-01-11
Publication date: 2022-08-25
Also published as: JPWO2022176432A1

Abstract

An upper cover part (24) is provided with a first air guide plate (33) that guides cooling air flowing in from a first inflow port (27) toward an oil cooler (15) on a first stage, and a second air guide plate (34) that guides cooling air flowing in from a second inflow port (28) toward an intercooler (16) on a second stage. In this case, the first air guide plate (33) is attached at an upper portion thereof to a right side of the upper cover part (24) relative to the first inflow port (27), and is inclined to the left toward a gap (17). The second air guide plate (34) is attached at an upper portion thereof to an intermediate portion of the upper cover part (24) between the first inflow port (27) and the second inflow port (28), and is inclined to the right toward the intercooler (16).

Description

construction machinery

The present invention relates to, for example, construction machinery such as a hydraulic excavator equipped with a heat exchanger for cooling fluid.

A hydraulic excavator, which is a representative example of construction machinery, includes a self-propelled undercarriage, an upper revolving body rotatably provided on the lower carriage, and a rotatable front portion of the upper revolving body. a working device;

The upper revolving structure includes a revolving frame extending in the longitudinal direction, an engine mounted on the revolving frame as a power source, and a cooling fan provided near the engine for circulating cooling air in the lateral direction of the revolving frame. , a first-stage heat exchanger that is provided on the revolving frame and extends in the front-rear direction and cools the fluid by passing the cooling air therethrough; A second-stage heat exchanger that is stacked on the outer side of the first-stage heat exchanger in the left-right direction and cools the fluid by passing cooling air; , an exterior cover having an upper cover portion covering the upper sides of the first stage heat exchanger and the second stage heat exchanger, and an upper cover positioned above the first stage heat exchanger a first inlet provided in the upper cover portion for allowing external air to flow into the exterior cover as cooling air; and a second inflow port for inflowing into the exterior cover as cooling air (Patent Document 1).

For example, as the first-stage heat exchanger, a radiator that cools engine cooling water and an oil cooler that cools hydraulic oil are arranged in parallel. Also, an intercooler for cooling the intake air of the engine is arranged as the second-stage heat exchanger.

And the cooling fan rotates when the hydraulic excavator is running or working. As a result, external air flows into the exterior cover as cooling air through the first inlet, the second inlet, and the like, and this cooling air is supplied to each heat exchanger.

In addition, in the hydraulic excavator, in the laterally outer side of the first stage heat exchanger and the second stage heat exchanger, that is, in the space between the second stage heat exchanger and the exterior cover, An air cleaner, a battery, etc. are arranged (Patent Documents 2 and 3). Furthermore, some hydraulic excavators have an aqueous urea tank for storing an aqueous urea solution used for cleaning engine exhaust gas in the space between the second-stage heat exchanger and the exterior cover.

JP-A-2001-341533 WO2013/099519 JP-A-2001-159152

By the way, in the invention of Patent Document 1, the first-stage heat exchanger and the second-stage heat exchanger are arranged so as to overlap each other. Therefore, the air warmed by the second-stage heat exchanger is supplied to the first-stage heat exchanger positioned downstream in the cooling air flow direction. Further, in the inventions of

Patent Documents

2 and 3, members such as an air cleaner and a battery are arranged in the space between each heat exchanger and the exterior cover. Therefore, these members become obstacles when cooling air is supplied to each heat exchanger.

As a result, the cold cooling air cannot be sufficiently supplied to the first stage heat exchanger and the second stage heat exchanger, so the fluid cannot be efficiently cooled. In other words, there is a problem that the first stage heat exchanger and the second stage heat exchanger are enlarged in order to obtain a predetermined cooling performance.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the prior art. To provide a construction machine capable of increasing the cooling efficiency and reducing the size of a first-stage heat exchanger and a second-stage heat exchanger.

The present invention comprises a vehicle body frame extending in the longitudinal direction, a power source mounted on the vehicle body frame, and a cooling fan provided in the vicinity of the power source for circulating cooling air in the lateral direction of the vehicle body frame. a first-stage heat exchanger provided on the vehicle body frame extending in the front-rear direction for cooling the fluid by passing the cooling air therethrough; and a gap between the first-stage heat exchanger and the a second-stage heat exchanger that is provided outside the first-stage heat exchanger in the left-right direction and cools the fluid by passing the cooling air therethrough; and is provided on the vehicle body frame, an exterior cover having an upper cover portion covering the power source, the cooling fan, the first-stage heat exchanger, and the second-stage heat exchanger; and the first-stage heat exchanger. a first inlet located above the exchanger and provided in the upper cover portion for allowing external air to flow into the exterior cover as the cooling air; and a laterally outer side of the first inlet. and a second inlet provided in the upper cover portion for allowing external air to flow into the exterior cover as the cooling air, wherein the upper cover portion includes the a first baffle plate that guides the cooling air flowing in from the first inlet toward the first-stage heat exchanger; and a second baffle plate for guiding toward the second heat exchanger, wherein the upper part of the first baffle plate is located inside the first inlet in the upper cover portion in the left-right direction. The second baffle plate is attached and inclined outward in the left-right direction toward the gap, and the upper portion of the second baffle plate is between the first inlet and the second inlet in the upper cover portion. mounted and inclined inward in the left-right direction toward the second stage heat exchanger.

According to the present invention, the cooling efficiency can be increased by efficiently supplying cold cooling air to the first-stage heat exchanger and the second-stage heat exchanger. The size of the heat exchanger and the second-stage heat exchanger can be reduced.

1 is a left side view showing a hydraulic excavator applied to a first embodiment of the present invention; FIG. Fig. 3 is a perspective view of the upper revolving body, omitting the cab, part of the exterior cover, and the like, as seen from the front left side; Fig. 3 is a perspective view of the upper revolving body with the cab, part of the exterior cover, etc. omitted, as seen from the front right side; Fig. 2 is a perspective view of the upper revolving body with the cab and the like omitted, as seen from below; FIG. 4 is a plan view showing the upper revolving body with the cab, part of the exterior cover, etc. omitted. Fig. 3 is a perspective view of the upper revolving body omitting a cab, an exterior cover, etc., as seen from the front left side; FIG. 4 is a perspective view showing the rear portion of the upper rotating body in a state in which the opening/closing portion of the exterior cover is seen through; FIG. 4 is an enlarged plan view showing the left rear part of the upper rotating body in a state in which the opening/closing part of the exterior cover is seen through; FIG. 4 is an enlarged plan view showing the left rear portion of the upper rotating body with the opening/closing portion of the exterior cover omitted; FIG. 9 is a cross-sectional view of the left rear portion of the upper rotating body as seen from the direction of arrows XX in FIG. 8; FIG. 9 is a plan view of the left rear portion of the upper rotating body provided with the first inlet and the first baffle plate according to the second embodiment of the present invention, viewed from the same position as in FIG. 8 ;

A wheel-type hydraulic excavator will be described below in detail with reference to the accompanying drawings as a representative example of the construction machine according to the embodiment of the present invention. In this embodiment, in order to clearly show the internal structure of the exterior cover, a part of the exterior cover and the like is shown as a transparent view using dotted lines.

1 to 10 show the first embodiment of the present invention. In FIG. 1, a hydraulic excavator 1 is a wheeled hydraulic excavator provided with a self-propellable wheeled undercarriage 2 having left and right front wheels 2A and left and right rear wheels 2B (only the left side is shown). The hydraulic excavator 1 includes an upper revolving body 3 rotatably mounted on a lower traveling body 2 and a work device 4 rotatably provided in front of the upper revolving body 3 . The lower traveling body 2 and the upper revolving body 3 constitute the vehicle body of the hydraulic excavator 1 .

As shown in FIGS. 2 to 6, the revolving frame 5 constitutes a vehicle body frame and extends in the front-rear direction. The revolving frame 5 includes a thick bottom plate 5A extending in the front-rear direction, a left vertical plate 5B, a right vertical plate 5C standing on the bottom plate 5A and extending in the front-rear direction with a predetermined interval in the left-right direction, the bottom plate 5A and the bottom plate 5A. A plurality of left extension beams 5D extending leftward from the left vertical plate 5B, a plurality of right extension beams 5E extending rightward from the bottom plate 5A and the right vertical plate 5C, and front and rear at the tips of the plurality of left extension beams 5D. A support structure includes a left side frame 5F provided extending in the direction of the right side, and a right side frame 5G provided extending in the front-rear direction at the tip of a plurality of right overhanging beams 5E. A work device 4 is rotatably attached to the front portions of the left vertical plate 5B and the right vertical plate 5C.

The cab 6 is provided on the front left side of the revolving frame 5 (see Fig. 1). The cab 6 forms a cab in which an operator boards. Inside the cab 6, there are arranged a driver's seat in which an operator sits, a steering wheel for traveling, an operation lever for working, etc. (none of them are shown).

The counterweight 7 is provided at the rear portion of the revolving frame 5. The counterweight 7 is configured as a weight that balances the weight with the working device 4 . The counterweight 7 closes the rear side of an engine chamber 10 and an inflow chamber 11, which will be described later.

As shown in FIGS. 2 and 3, the partition plate 8 and the partition plate 9 are arranged on the front side of the counterweight 7 with a space therebetween. For example, the

partition plates

8 and 9 are erected on the revolving frame 5 at the rear surface of the cab 6 so as to extend in the left-right direction. A central partition plate 8 covers the front side of the engine room 10 . The left partition plate 9 covers the front side of the inflow chamber 11 .

As shown in FIGS. 5 and 6, the engine compartment 10 is provided on the front side of the counterweight. The engine compartment 10 has a front side closed by a partition plate 8, a rear side closed by a counterweight 7, an upper side closed by an upper cover portion 24 of an exterior cover 21 described later, and a lower side closed by a revolving frame 5 and an undercover 31 described later. , 32, the left side is closed by a radiator 14 and an oil cooler 15, which will be described later, and the right side is closed by a right cover portion 23 of the exterior cover 21. The space extends in the left-right direction. An engine 12, a hydraulic pump (not shown), and the like are arranged in the engine room 10 .

The inflow chamber 11 is provided on the left side of the engine room 10 . In this case, the left side is the upstream side in the flow direction of the cooling air or the outer side in the left-right direction. The inflow chamber 11 has a front side closed by the partition plate 9, a rear side closed by the counterweight 7, an upper side closed by the upper cover portion 24 of the exterior cover 21, and a lower side closed by the revolving frame 5 and the undercover 31, The left side is closed by the left cover portion 22 of the exterior cover 21 and the right side is closed by the radiator 14 and the oil cooler 15 to form a quadrangular prism-shaped space. The inflow chamber 11 is separated from the engine chamber 10 by a radiator 14, an oil cooler 15, and the like. In the inflow chamber 11, members such as an air cleaner 18, a battery 19, a urea water tank 20, and the like, which will be described later, are arranged.

The engine 12 as a power source is located inside the engine room 10 and provided on the revolving frame 5 . The engine 12 is configured, for example, as an internal combustion engine with a water jacket (not shown). In addition, the engine 12 is mounted on the revolving frame 5 in a horizontal position extending in the left-right direction. A hydraulic pump (not shown) is attached to the right side of the engine 12 . The hydraulic pump is driven by the engine 12 to discharge hydraulic oil from a hydraulic oil tank 35, which will be described later, as pressure oil. On the left side of the engine 12, a cooling fan 13, which will be described later, is provided facing the radiator 14 and the oil cooler 15. As shown in FIG.

The cooling fan 13 is provided on the left side of the engine 12. The cooling fan 13 is formed as a suction fan that circulates cooling air in the horizontal direction of the revolving frame 5, specifically from the left side to the right side. As a result, the cooling fan 13 is rotated by the engine 12 to suck the external air as cooling air into the outer cover 21 and supply it to the radiator 14 , the oil cooler 15 and the intercooler 16 . The cooling fan 13 may be separated from the engine 12 and rotated by an electric motor or a hydraulic motor.

A radiator 14 as a first-stage heat exchanger is provided on the revolving frame 5 so as to face the left side of the cooling fan 13 with a gap. The radiator 14 is provided between the counterweight 7 and the partition plate 8 and is positioned closer to the front side on the partition plate 8 side and extends in the front-rear direction. The radiator 14 is also connected to the water jacket of the engine 12 via a radiator hose (not shown). Thereby, the radiator 14 can cool the engine cooling water by passing the cooling air.

The oil cooler 15 as a first-stage heat exchanger is located on the rear side of the radiator 14 and is provided on the revolving frame 5 so as to face the left side of the cooling fan 13 with a gap. The oil cooler 15 is arranged in parallel (side by side) with the radiator 14 with respect to the flow direction of the cooling air. Thus, the oil cooler 15 partitions the engine chamber 10 and the inflow chamber 11 together with the radiator 14 . Also, the oil cooler 15 is connected to various hydraulic actuators and a hydraulic oil tank 35 via oil pipes (not shown). As a result, the oil cooler 15 can cool the working oil returned to the working oil tank 35 from various hydraulic actuators by passing the cooling air.

Here, the longitudinal length of the radiator 14 and the oil cooler 15 that constitute the first stage heat exchanger is the length between the front surface of the counterweight 7 and the partition plate 8 in the longitudinal direction. The dimensions are set slightly smaller than the dimensions. In addition, the gap between the radiator 14 and the partition plate 8 and the gap between the oil cooler 15 and the counterweight 7 are filled with a frame surrounding the radiator 14 and the oil cooler 15 or a sealing material made of a foamed resin material or the like. not shown).

The intercooler 16 as a second-stage heat exchanger is stacked on the left side of the radiator 14 and the oil cooler 15, which are outside in the left-right direction, with a gap 17, which will be described later, between the radiator 14 and the oil cooler 15. are provided. As shown in FIGS. 6 and 10, the intercooler 16 overlaps only the upper portions of the radiator 14 and the oil cooler 15 . The intercooler 16 is connected to a supercharger and an air intake device (both not shown) of the engine 12 via air lines. As a result, the intercooler 16 can cool the air pressurized by the supercharger and supply it to the air intake device by passing the cooling air.

Here, the upper portion of the intercooler 16 faces the second inlet 28 of the opening/closing portion 26 that constitutes the upper cover portion 24 of the exterior cover 21, which will be described later. A lower portion of the intercooler 16 is arranged at a position lower than the opening/closing portion 26 and faces a main inlet 22A provided in the left cover portion 22 of the exterior cover 21, which will be described later.

A gap 17 is provided between the first stage radiator 14 and oil cooler 15 and the second stage intercooler 16 . The upper part of the radiator 14 and the oil cooler 15 overlaps the intercooler 16 on the upstream side in the flow direction of the cooling air. is set. That is, cooling air is supplied through the gap 17 to the upper portions of the radiator 14 and the oil cooler 15 .

The air cleaner 18 , the battery 19 and the urea water tank 20 are provided inside the inflow chamber 11 . The air cleaner 18 is positioned above the inflow chamber 11 and fixed between the intercooler 16 and the left cover portion 22 of the exterior cover 21 . Air cleaner 18 cleans the air supplied to engine 12 . The battery 19 is located below the inflow chamber 11 and arranged between the radiator 14 , the oil cooler 15 and the left cover portion 22 of the exterior cover 21 . A battery 19 stores power to be supplied to various electrical components (not shown). Battery 19 is formed in a rectangular parallelepiped shape. The urea water tank 20 stores the urea water solution used for cleaning the exhaust gas of the engine 12 . The urea water tank 20 is formed as a closed container and arranged between the radiator 14 , the oil cooler 15 and the left cover portion 22 of the exterior cover 21 .

As shown in FIG. 10, the air cleaner 18, the battery 19 and the urea water tank 20 are arranged between the main inlet 22A of the left cover portion 22 and the radiator 14, the oil cooler 15 and the intercooler 16. For this reason, the air cleaner 18, the battery 19, and the urea water tank 20 obstruct the flow of the air that has flowed into the inflow chamber 11 from the main inflow port 22A of the left cover portion 22 toward the radiator 14, the oil cooler 15, and the intercooler 16. is an obstacle to

The exterior cover 21 is provided on the revolving frame 5. The exterior cover 21 is positioned between the cab 6 and the counterweight 7 and formed over the entire width of the revolving frame 5 . The exterior cover 21 covers the engine 12, hydraulic pump, cooling fan 13, radiator 14, oil cooler 15, intercooler 16, and the like. The exterior cover 21 has a left cover portion 22 , a right cover portion 23 and an upper cover portion 24 .

The left cover portion 22 of the exterior cover 21 is formed as a vertical plate extending upward from the left side frame 5F of the revolving frame 5. The left cover portion 22 covers the left side of the inflow chamber 11 . As shown in FIG. 7, a main inlet 22A is formed on the upper side of the left cover portion 22 and is composed of a plurality of slits extending in the front-rear direction and arranged in the vertical direction. The main inlet 22A serves as an opening for allowing air to flow into the inlet chamber 11 to supply the radiator 14, the oil cooler 15, and the intercooler 16, as indicated by an arrow A in FIG. The main inlet 22A may have other shapes such as a vertically extending slit, an opening covered with a mesh, or the like. On the other hand, as shown in FIG. 5, the right cover portion 23 is formed as a vertical plate extending upward from the right side frame 5G of the revolving frame 5. As shown in FIG. The right cover portion 23 covers the right side of the engine room 10 .

The upper cover portion 24 covers the upper sides of the engine 12, the hydraulic pump, the cooling fan 13, the radiator 14, the oil cooler 15, and the intercooler 16. The upper cover portion 24 is composed of an upper plate portion 25 and an opening/closing portion 26 which will be described later.

The upper plate portion 25 is provided so as to extend in the left-right direction at a height position equivalent to the upper surface of the counterweight 7 . For example, the upper plate portion 25 is composed of a plurality of plates horizontally extending over the upper end portion of the left cover portion 22 and the upper end portion of the right cover portion 23 (the plate member located on the right side is not shown). On the other hand, the upper plate portion 25 can also be formed as a single plate.

The upper plate portion 25 also has openings 25A at positions corresponding to the engine 12, the cooling fan 13, the radiator 14, the oil cooler 15, and the intercooler 16. As shown in FIG. 10, the left side position of the opening 25A is set at a position away from the intercooler 16. As shown in FIG. As a result, the cooling air that has flowed in from the second inlet 28 can flow to a position below the intercooler 16 through the gap between the left side position of the opening 25A and the intercooler 16 .

The opening/closing part 26 is provided on the upper plate part 25 so as to be able to be opened and closed so as to cover the opening 25A. The opening/closing unit 26 has a left panel 26A, a right panel 26B, a front panel 26C, and a rear panel 26D arranged in a rectangular frame shape elongated in the left-right direction, and a rectangular upper panel 26E that closes the upper side. It is designed as an open box body. The left face plate 26A faces the upper part of the intercooler 16 with a space therebetween. Further, the left plate 26A is provided with a second inlet 28, which will be described later.

The upper plate 26E is arranged at a position higher than the upper ends of the radiator 14, the oil cooler 15, and the intercooler 16. Thereby, an upper space is formed between the radiator 14, the oil cooler 15, the intercooler 16 and the top plate 26E. A first baffle plate 33, which will be described later, is disposed in this upper space. The top plate 26E is provided with a first inlet 27 and an upper outlet 29, which will be described later.

The first inlet 27 is located above the first-stage heat exchanger, for example, above the oil cooler 15 and is provided on the top plate 26E of the opening/closing section 26 . The first inlet 27 allows outside air to flow into the exterior cover 21 as cooling air. The first inlet 27 is provided in a range in the front-rear direction that is slightly smaller than the front-rear dimension (width) of the oil cooler 15 . For example, the first inlet 27 is formed as a plurality of slits extending in the left-right direction and arranged in the front-rear direction. The first inlet 27 can also have other shapes, such as a longitudinally extending slit, an opening covered with a mesh, or the like. Here, the first inlet 27 can be formed to be large in the left-right direction by a first baffle plate 33, which will be described later.

The second inlet 28 is provided on the left side plate 26A of the opening/closing section 26, positioned on the left side of the first inlet 27 and outside in the left-right direction. The second inlet 28 allows external air to flow into the exterior cover 21 as cooling air. The second inlet 28 is provided in a longitudinal range equivalent to the longitudinal dimension (width dimension) of the intercooler 16 . As shown in FIGS. 2 and 7, for example, the second inlet 28 is formed by arranging a plurality of rectangular openings. The second inlet 28 can also have other shapes, such as a single large opening, a slit, or the like. Here, the second inlet 28 can be formed large in the vertical direction by a second baffle plate 34, which will be described later.

The upper outlet port 29 is located above the engine 12 and provided on the upper plate 26E of the opening/closing portion 26 . The upper outlet port 29 allows the cooling air that has flowed into the engine room 10 in a warm state after passing through the radiator 14, the oil cooler 15, and the intercooler 16 to flow outside as indicated by an arrow B in FIG.

The partition member 30 is provided between the radiator 14 , the oil cooler 15 and the opening/closing portion 26 . The partition member 30 is formed as a plate extending across the front plate 26C and the rear plate 26D of the opening/closing portion 26. As shown in FIG. As a result, the partition member 30 prevents warmed air in the engine chamber 10 from flowing back to the inflow chamber 11 side through the space between the radiator 14 , the oil cooler 15 and the opening/closing portion 26 .

The undercover 31 and the undercover 32 are provided on the revolving frame 5 so as to cover the lower sides of the engine room 10 and the inflow room 11 (see FIGS. 4 and 10). The undercover 31 on the left side (on the side of the inflow chamber 11) is provided with a lower inflow port 31A positioned on the inflow chamber 11 side. Further, the left undercover 31 is provided with a first lower outlet 31B located on the engine room 10 side. As indicated by arrow C, the lower inlet 31A allows external air to flow into the inlet chamber 11 as cooling air. Also, the first lower outlet 31B, as indicated by arrow D, allows the cooling air warmed in the engine room 10 to flow out.

A second lower outlet 32A is provided in the undercover 32 on the right side (engine room 10 side). 32 A of 2nd lower side outflow ports let the cooling air which was warmed in the engine room 10 flow outside, as shown by the arrow E.

Here, the lower inlet 31A, the first lower outlet 31B, and the second lower outlet 32A are formed by slits extending in the front-rear direction and arranged in the left-right direction. The lower inlet 31A, the first lower outlet 31B and the second lower outlet 32A may be formed by a plurality of holes or the like.

Next, the configuration, function, etc. of the first baffle plate 33 and the second baffle plate 34, which are characteristic parts of this embodiment, will be described. In this embodiment, the first baffle plate 33 and the second baffle plate 34 are arranged on the left side of the upper rotating body 3 . Therefore, the laterally outer side is the left side, and the laterally inner side is the right side. On the other hand, when the first baffle plate and the second baffle plate are arranged on the right side of the upper rotating body, the laterally outer side is the right side, and the laterally inner side is the left side.

The first baffle plate 33 is provided on the upper surface plate 26E of the opening/closing portion 26 that constitutes the upper cover portion 24 . The first baffle plate 33 directs the cooling air that has flowed into the inflow chamber 11 from the first inlet 27 to the left side of the oil cooler 15 (upstream side in the flow direction of the cooling air), that is, between the oil cooler 15 and the intercooler. 16 to the gap 17. The first baffle plate 33 is formed to have a longitudinal length smaller than the longitudinal length of the radiator 14 and oil cooler 15 serving as the first-stage heat exchangers. It is

The first baffle plate 33 is formed by an inclined plate 33A and two side plates 33B. 33 A of inclined plates consist of a rectangular-shaped plate elongated in the front-back direction. The inclined plate 33A is inclined from the upper side toward the lower side toward the left side (the outer side in the left-right direction, the upstream side in the flow direction of the cooling air). Thus, the upper portion of the inclined plate 33A is attached to the right side of the first inlet 27 in the upper plate 26E, and is inclined leftward toward the gap 17. As shown in FIG.

The two side plates 33B are formed as triangular plates extending from both ends of the inclined plate 33A in the front-rear direction toward the top plate 26E. The two side plates 33B guide the cooling air guided by the inclined plate 33A so that it does not spill from the front and rear positions of the inclined plate 33A.

As indicated by arrow F in FIG. A large amount of cooling air, including cooling air flowing in from directly above, can be guided toward the gap 17 between the oil cooler 15 and the intercooler 16 . In other words, even if the first air inlet 27 is enlarged to the right side (downstream side in the cooling air flow direction) of the gap 17 serving as the inlet portion of the cooling air of the oil cooler 15, the first air guide plate 33 , the cooling air flowing in from the first inlet 27 can be guided to the gap 17 . As a result, the first baffle plate 33 can increase the size of the first inlet 27 and increase the amount of inflow of the cooling air.

The second baffle plate 34 is provided on the left plate 26A of the opening/closing portion 26 that constitutes the upper cover portion 24. As shown in FIG. The second baffle plate 34 guides the cooling air that has flowed into the inflow chamber 11 from the second inlet 28 toward the intercooler 16 . The second baffle plate 34 is formed to have the same length dimension in the front-rear direction as that of the intercooler 16 in the front-rear direction.

The second baffle plate 34 is formed of a rectangular plate elongated in the front-rear direction, and is slanted from top to bottom toward the right side (the inner side in the left-right direction, the downstream side in the flow direction of the cooling air). is doing. As a result, the upper part of the second baffle plate 34 is located between the first inlet 27 and the second inlet 28 in the upper cover part 24, that is, at the corner between the left plate 26A and the upper plate 26E. mounted and slanted to the right toward the intercooler 16. The second baffle plate 34 may be provided with a side plate like the first baffle plate 33 .

As indicated by arrow G, the second baffle plate 34 configured in this way allows the cooling air flowing into the inflow chamber 11 from the second inflow port 28 to flow in from a position higher than the intercooler 16 . A large amount of cooling air can be directed toward the intercooler 16, including the cooling air that cools the air. In other words, even if the second inlet 28 is enlarged to a position higher than the intercooler 16, the second baffle plate 34 can guide the cooling air flowing in from the second inlet 28 to the intercooler 16. . As a result, the second baffle plate 34 can increase the size of the second inlet 28 and increase the inflow of the cooling air.

The hydraulic excavator 1 according to this embodiment has the configuration as described above, and the operation thereof will be described next.

The operator gets on the cab 6, sits in the driver's seat, and starts the engine 12. In this state, the operator can cause the lower traveling body 2 to travel by operating the handle for traveling. On the other hand, the operator can perform the revolving motion of the upper revolving body 3, the earth and sand excavation work by the work device 4, and the like by operating the operation lever for work and the like.

When the hydraulic excavator 1 is in operation, the cooling fan 13 is driven by the engine 12 to supply cooling air to the radiator 14, oil cooler 15, and intercooler 16. Therefore, how the cooling air flows to the radiator 14, the oil cooler 15, and the intercooler 16 will be described with reference to FIG. 10 and the like.

When the cooling fan 13 rotates, the inside of the inflow chamber 11 becomes negative pressure, and outside air is sucked in as cooling air. First, as indicated by an arrow A, the cooling air that has flowed in from the main inlet 22A of the left cover portion 22 that constitutes the exterior cover 21 flows through the inflow chamber 11 toward the radiator 14, the oil cooler 15, and the intercooler 16. . Further, as indicated by an arrow F, the cooling air flowing in from the first inlet 27 provided in the upper surface plate 26E of the opening/closing portion 26 constituting the upper cover portion 24 of the exterior cover 21 is directed to the first air guide. Guided by the plate 33, it flows toward the oil cooler 15 (gap 17). As indicated by the arrow G, the cooling air flowing in from the second inlet 28 provided in the left side plate 26A of the opening/closing portion 26 constituting the upper cover portion 24 of the exterior cover 21 flows through the second air guide plate 34. and flows toward the intercooler 16. Furthermore, as indicated by arrow C, the cooling air that has flowed in from the lower side inlet 31A of the undercover 31 flows through the inflow chamber 11 toward the radiator 14 and the oil cooler 15 .

As a result, cooling air can be supplied toward the radiator 14, the oil cooler 15, and the intercooler 16, and fluids such as engine cooling water, hydraulic oil, and air sucked by the engine 12 can be cooled.

On the other hand, the cooling air that has passed through the radiator 14, the oil cooler 15, and the intercooler 16 and flowed into the engine room 10 in a warm state is discharged to the outside from the upper outlet 29 indicated by the arrow B, and is discharged to the outside as indicated by the arrow D. It is discharged to the outside from one lower outlet 31B, and is discharged to the outside from the second lower outlet 32A indicated by the arrow E.

By the way, in the inflow chamber 11, an air cleaner 18, a battery 19, a urea water tank 20, etc. are arranged. For this reason, the cooling air flowing in from the main inlet 22A of the left cover portion 22 may not be efficiently supplied to the radiator 14, the oil cooler 15, and the intercooler 16 because of these obstacles.

However, according to the present embodiment, the upper cover portion 24 has the first air guide for guiding the cooling air that has flowed in from the first inlet 27 toward the oil cooler 15 as the first-stage heat exchanger. A plate 33 and a second baffle plate 34 are provided to guide the cooling air flowing in from the second inlet 28 toward the intercooler 16 as a second-stage heat exchanger. Above this, the first baffle plate 33 is mounted on the right side of the upper cover portion 24 so that the upper portion is inside the first inlet port 27 in the left-right direction. slopes to the left. The second baffle plate 34 has an upper portion attached between the first inlet 27 and the second inlet 28 in the upper cover portion 24 and is located inside the intercooler 16 in the left-right direction. sloping to the right.

Accordingly, since the first baffle plate 33 is inclined to the left, which is the side opposite to the flow direction of the cooling air, most of the cooling air flowing into the inflow chamber 11 from the first inlet 27 is It can be directed towards cooler 15 . Further, since the second baffle plate 34 is inclined to the right toward the intercooler 16, most of the cooling air flowing into the inflow chamber 11 from the second inlet 28 is guided toward the intercooler 16. be able to.

As a result, the oil cooler 15 and the intercooler 16 can be sufficiently supplied with cold cooling air, and the cooling efficiency of the working oil and the intake air of the engine 12 can be increased. As a result, the oil cooler 15 and the intercooler 16 can be formed small while maintaining the cooling performance, and the hydraulic excavator 1 can be miniaturized.

In addition, even if the first air guide plate 33 is inclined leftward, which is the opposite side to the flow direction of the cooling air, even if the first inlet 27 is formed to be large just above the oil cooler 15, Cooling air flowing in from the inlet 27 can be guided to the oil cooler 15 through the gap 17 . As a result, the first inlet 27 can be made large, the amount of cooling air flowing in can be increased, and the cooling efficiency of the hydraulic oil by the oil cooler 15 can be enhanced.

Similarly, the second baffle plate 34 inclined to the right in the flow direction of the cooling air does not allow the second inlet 28 to be enlarged to a position higher than the intercooler 16. Cooling air flowing from 28 can be guided to intercooler 16 . As a result, the second inlet 28 can be made larger to increase the amount of cooling air flowing in, and the cooling efficiency of the intake air of the engine 12 by the intercooler 16 can be enhanced.

The first baffle plate 33 is provided with side plates 33B extending from both ends in the front-rear direction, that is, both ends of the inclined plate 33A toward the upper surface plate 26E as the upper cover portion 24. As shown in FIG. As a result, the side plate 33B can guide the cooling air guided by the inclined plate 33A so as not to spill from the front and rear positions of the inclined plate 33A. can be supplied to

Furthermore, the first baffle plate 33 has a longitudinal length smaller than the longitudinal length of the radiator 14 and the oil cooler 15 serving as the first-stage heat exchangers. is formed with As a result, the first baffle plate 33 can be arranged at an arbitrary position with respect to the radiator 14 and the oil cooler 15, and the supply points of the cooling air can be finely set.

Next, FIG. 11 shows a second embodiment of the present invention. A feature of the second embodiment is that the first heat exchanger consists of two heat exchangers arranged in the front-rear direction, and the first baffle plate corresponds to the two heat exchangers. It is that two are provided. In addition, in the second embodiment, the same reference numerals are given to the same constituent elements as in the first embodiment described above, and the description thereof will be omitted.

In FIG. 11, the first inlets 41 according to the second embodiment are located at two positions above the radiator 14 and the oil cooler 15 that constitute the first-stage heat exchanger. is provided on the upper surface plate 26E.

Two first baffle plates 42 according to the second embodiment are provided corresponding to the two heat exchangers, that is, the radiator 14 and the oil cooler 15 . The first baffle plate 42 located on the front side is arranged above the radiator 14 and can guide the cooling air flowing in from the first inlet 41 located on the front side toward the radiator 14 . On the other hand, the first baffle plate 42 located on the rear side is arranged above the oil cooler 15 and is located on the rear side, similarly to the first baffle plate 33 according to the first embodiment. The cooling air flowing in from one inlet 41 can be guided toward the oil cooler 15 . Since the two first baffle plates 42 are configured in the same manner as the first baffle plate 33 according to the first embodiment, detailed description thereof will be omitted.

Thus, also in the second embodiment configured in this manner, the same effects as those of the first embodiment described above can be obtained. In particular, according to the second embodiment, cooling air can be efficiently supplied to both the radiator 14 and the oil cooler 15 . Also, the two first baffle plates 42 can supply optimum cooling air according to the heat exchanger by making the shapes different.

It should be noted that each embodiment has been described with the engine 12 as an example of the power source. However, the present invention is not limited to this, and for example, an engine and an electric motor (hybrid type), or an electric motor alone may be used as a power source.

In each embodiment, the radiator 14 and the oil cooler 15 arranged in the front-rear direction are exemplified as the first stage heat exchanger, and the intercooler 16 is exemplified as the second stage heat exchanger. However, the present invention is not limited to this, and may be configured to use a condenser for cooling the refrigerant used in the air conditioner, a fuel cooler for cooling the fuel, or the like as the first stage heat exchanger or the second stage heat exchanger. good.

Alternatively, a radiator, an oil cooler, and an intercooler may be arranged side by side in the front-rear direction as the first-stage heat exchanger, and a condenser may be arranged as the second-stage heat exchanger. That is, as long as the first-stage heat exchanger and the second-stage heat exchanger are stacked in the cooling air flow direction, the radiator, oil cooler, intercooler, etc. can be freely combined. can.

In each embodiment, the case where the upper cover portion 24 of the exterior cover 21 is formed by the upper plate portion 25 and the box-shaped opening/closing portion 26 has been described as an example. However, the present invention is not limited to this. For example, the upper cover portion of the exterior cover may be formed flat.

Furthermore, in the embodiment, the wheel-type hydraulic excavator 1 is taken as an example of the construction machine. However, the present invention is not limited to this, and can be widely applied to other construction machines such as crawler hydraulic excavators, hydraulic cranes, and wheel loaders.

1 Hydraulic excavator (construction machinery)
2 Undercarriage (body)
3 Upper revolving body (body)
5 Revolving frame (body frame)
12 engine (power source)
13 cooling fan 14 radiator (first stage heat exchanger)
15 Oil cooler (first stage heat exchanger)
16 intercooler (second stage heat exchanger)
17 Gap 21 Exterior cover 24

Upper cover part

27, 41 First inlet 28

Second inlet

33, 42 First air guide plate 33B Side plate 34 Second air guide plate

Claims

a vehicle body frame extending in the longitudinal direction;
a power source mounted on the vehicle body frame;
a cooling fan provided near the power source for circulating cooling air in the lateral direction of the vehicle body frame;
a first-stage heat exchanger provided on the vehicle body frame to extend in the front-rear direction and cooling a fluid through passage of the cooling air;
A second stage which is provided outside the first stage heat exchanger in the lateral direction with a gap from the first stage heat exchanger and cools the fluid by passing the cooling air therethrough. a heat exchanger of
an exterior cover provided on the vehicle body frame and having an upper cover portion that covers the upper sides of the power source, the cooling fan, the first stage heat exchanger, and the second stage heat exchanger; ,
a first inlet located above the first-stage heat exchanger and provided in the upper cover portion for allowing external air to flow into the exterior cover as the cooling air;
a second inlet located outside the first inlet in the left-right direction and provided in the upper cover portion for allowing external air to flow into the exterior cover as the cooling air;
In a construction machine comprising
The upper cover portion includes a first baffle plate that guides the cooling air that has flowed in from the first inlet toward the first-stage heat exchanger, and the cooling air that has flowed in from the second inlet. a second baffle plate that guides the cooling air toward the second-stage heat exchanger;
the first baffle plate has an upper portion attached to the inside of the first inlet in the upper cover portion in the left-right direction, and is inclined outward in the left-right direction toward the gap;
The second baffle plate has an upper portion attached between the first inlet and the second inlet in the upper cover portion, and is mounted on the left and right toward the second-stage heat exchanger. A construction machine characterized by being slanted inward in a direction.
In the construction machine according to claim 1,
At least one of the first baffle plate and the second baffle plate is provided with side plates extending from both ends in the front-rear direction toward the upper cover portion. and construction machinery.
In the construction machine according to claim 1,
The first baffle plate is formed with a length dimension in the front-rear direction smaller than the length dimension in the front-rear direction of the first stage heat exchanger. construction machinery.
In the construction machine according to claim 1,
The first-stage heat exchanger consists of two heat exchangers arranged in the front-rear direction,
The construction machine, wherein two of the first baffle plates are provided corresponding to the two heat exchangers.