JP7133413B2 - construction machinery - Google Patents

Description

The present invention relates to construction machinery.

Patent Document 1 discloses an electric hydraulic excavator as an example of construction machinery. An electric hydraulic excavator has an electric motor driven by electric power stored in a battery instead of the engine of a conventional hydraulic excavator.
A battery unit having a large number of batteries is provided at the rear portion of the upper revolving body of the electric hydraulic excavator. The battery unit is covered by a rear cover.

A cooling unit, an inverter, an electric motor, and a hydraulic pump are provided in the inner side region of the side cover of the electric hydraulic excavator. The cooling unit has a cooling fan that blows air toward an exhaust port formed on the side surface of the side cover, and a heat exchange section that faces the upstream side of the cooling fan.

By driving the cooling fan, the air introduced from the side and front intake holes of the side cover and the air passing through the battery unit are guided into the side cover. After passing through the inverter, the electric motor, the hydraulic pump and the oil tank, the air passes through the heat exchanger and is discharged to the outside of the side cover through the exhaust port.

WO2011/102042

By the way, in the electric hydraulic excavator of Patent Document 1, the cooling fan blows air toward the outside of the side surface of the side cover, that is, toward the outside in the width direction of the upper rotating body. Therefore, the flow direction of the air introduced from the air intake holes on the side surface of the side cover is greatly changed. Therefore, it is necessary to secure a large air circulation path around the cooling unit by the amount of the air turning.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a construction machine capable of reducing the size of the cooling device and improving the cooling efficiency.

A construction machine according to one aspect of the present invention includes a horizontally extending base plate, a first opening and a front side of the first opening that covers a predetermined space area on the base plate from the outside in the width direction. an exterior cover having an exterior wall panel in which a second opening is formed; and a cooling device provided on the interior of the exterior cover in the width direction of the base plate along the exterior wall panel, wherein the cooling device comprises the first a cooling fan provided between the first opening and the second opening for blowing air from the rear side to the front side; a cooling unit having a heat exchange portion through which air can flow in the front-rear direction; a first air guide member extending toward the cooling unit from the first opening toward the inside in the width direction; a second air guide member extending toward the cooling unit as it goes inward in the width direction, the oil tank being provided on the front side of the second air guide member on the base plate and storing hydraulic oil. further provide.

According to the construction machine of the aspect described above, the cooling device can be made compact and the cooling efficiency can be improved.

1 is a side view of an electric hydraulic excavator according to an embodiment of the present invention; FIG. FIG. 2 is a schematic plan view showing the internal structure of the upper revolving body of the electric hydraulic excavator according to the embodiment of the present invention; FIG. 2 is a schematic left side view showing the internal structure of the upper revolving body of the electric hydraulic excavator according to the embodiment of the present invention; FIG. 2 is a schematic right side view showing the internal structure of the upper revolving body of the electric hydraulic excavator according to the embodiment of the present invention; FIG. 4 is a right side view of the upper rotating body of the electric hydraulic excavator according to the embodiment of the present invention; 1 is a schematic cross-sectional view of a cooling device for an electric hydraulic excavator according to an embodiment of the present invention; FIG.

Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 6. FIG.
<Electric hydraulic excavator (electric construction machine)>
As shown in FIG. 1 , an electric hydraulic excavator 200 as an example of an electric construction machine includes a lower traveling body 210 and an upper swing body 220 . Hereinafter, the direction in which gravity acts when the electric hydraulic excavator 200 is installed on a horizontal plane is referred to as the vertical direction.

<Lower running body>
Undercarriage 210 has a pair of crawler belts 211 . These crawler belts 211 are driven by a traveling hydraulic motor (not shown) to cause the lower traveling body 210 to travel. The running direction of the lower running body 210 is referred to as the front-rear direction, the forward side in the running direction (the normal forward direction, the side where the blade 212 described below is provided) is referred to as the front, and the rear in the running direction, which is the opposite side to the front, is referred to as the rear. In addition, when viewed in the forward direction, the right side is called "right", and the left side is called "left". A pair of crawler belts 211 are provided on the left and right sides.
A blade 212 is provided on the front portion of the lower traveling body 210 as a blade plate extending in the vehicle width direction of the lower traveling body 210 (hereinafter simply referred to as the width direction). The blade 212 is adjustable in height position by being driven by a hydraulic cylinder.

<Upper revolving body>
The upper swing body 220 is provided on the lower traveling body 210 . The upper revolving structure 220 is connected to the lower running structure 210 via a swing circle 215 . The swing circle 215 has an annular shape centered on the pivot axis extending in the vertical direction. The swing circle 215 allows the upper swing body 220 to swing about the swing axis with respect to the lower travel body 210 .

As shown in FIGS. 1 to 5, the upper revolving body 220 includes a work machine 221, a revolving frame 10, a portal frame 20, a battery unit 31, an inverter 36, a power delivery unit 37, a charging connector connection section 38, and an electric motor 39. , a hydraulic pump 51 , a hydraulic valve 52 , an operation pattern switching unit 53 , a swing motor 70 , an auxiliary battery 64 , an oil tank 65 , an operating space 80 , a protector 95 , an exterior cover 100 , and a cooling device 150 .

<Work machine>
The working machine 221 has a boom 222, an arm 223 and a bucket 224, as shown in FIG. The work machine 221 performs various works such as excavation by driving the boom 222, the arm 223, and the bucket 224 by respective hydraulic cylinders. Hereinafter, the width direction of the upper revolving body 220 when the work implement 221 faces the front of the electric hydraulic excavator 200 is simply referred to as the "width direction." Further, the direction toward the center in the width direction is referred to as the "inner side in the width direction", and the direction toward the left side (one side in the width direction) or the right side (the other side in the width direction) from the center in the width direction is referred to as the "outer side in the width direction".

<Rotating frame>
The swing frame 10 has a base plate 11 , a horizontal partition plate 12 , a front vertical partition plate 13 , a front reinforcing plate 14 , a bracket 15 and a rear vertical partition plate 16 .

<Base plate>
As shown in FIGS. 2 to 4, the base plate 11 is a horizontally extending plate-like member. That is, the base plate 11 extends in the front-rear direction and width direction. The base plate 11 may be configured by a single steel plate, or may be configured by combining a plurality of steel plates. The lower surface of base plate 11 is fixed on swing circle 215 . Thereby, the swing frame 10 is supported by the swing circle 215 from below.

<Horizontal partition plate>
The horizontal partition plate 12 is a plate-shaped member that protrudes upward from the upper surface of the base plate 11 and extends in the width direction. The horizontal partition plate 12 extends with the width direction as its longitudinal direction. The lateral partition plate 12 is arranged in a portion on the front side of the center of the base plate 11 in the front-rear direction. The horizontal partition plate 12 extends over both widthwise end portions of the base plate 11, that is, over both left and right end portions.

<Front vertical partition plate>
The front vertical partition plate 13 is a plate-shaped member that protrudes from the upper surface of the base plate 11 and extends in the front-rear direction. A pair of front vertical partition plates 13 are provided in front of the horizontal partition plate 12 on the upper surface of the base plate 11 and are spaced apart from each other in the width direction. That is, a pair of front vertical partition plates 13 are provided with an interval left and right. The pair of front vertical partition plates 13 are arranged on the inner side in the width direction of both ends of the base plate 11 in the width direction.

The front vertical partition plate 13 is connected to the front-facing surface of the horizontal partition plate 12 at its rear end. That is, the front vertical partition plate 13 is provided so as to extend forward from the horizontal partition plate 12 . As shown in FIG. 2, the pair of front vertical partition plates 13 are provided so as to approach each other as they go forward from the rear end portion where they are connected to the horizontal partition plate 12 .

<Front reinforcement plate>
The front reinforcement plate 14 is integrally fixed to the pair of front vertical partition plates 13 at the front of the pair of front vertical partition plates 13 . The front reinforcement plate 14 has a shape in which the distance in the width direction decreases toward the front in plan view according to the arrangement of the pair of front vertical partition plates 13 .

<Bracket>
Brackets 15 are fixed to the front ends of the pair of front vertical partition plates 13 and front reinforcement plates 14 . The bracket 15 is a cylindrical member penetrating vertically. Front ends of a pair of front vertical partition plate 13 and front reinforcing plate 14 are integrally fixed to the cylindrical outer peripheral surface. A working machine 221 is supported by the base plate 11 via the bracket 15 .

<Rear vertical partition plate>
The rear vertical partition plate 16 is a plate-shaped member that protrudes from the upper surface of the base plate 11 and extends in the front-rear direction. A pair of rear vertical partition plates 16 are provided behind the horizontal partition plate 12 on the upper surface of the base plate 11 and are spaced apart from each other in the width direction. That is, a pair of rear vertical partition plates 16 are provided on the left and right. The widthwise interval between the pair of rear vertical partition plates 16 is greater than the widthwise interval between the pair of front vertical partition plates 13 at their rear ends.

<gate type frame>
As shown in FIGS. 2 to 4, the portal frame 20 has a pair of pillars 21 and beams 22 .

The pair of pillars 21 are provided behind the lateral partition plate 12 on the base plate 11 and spaced apart in the width direction. The column portion 21 extends vertically and has its lower end fixed to the base plate 11 .
The beam portion 22 extends across the upper ends of the pair of column portions 21 in the width direction. The beam portion 22 is provided above the upper surface of the base plate 11 with a space therebetween. A pair of column portion 21 and beam portion 22 are integrally fixed. The portal frame 20 has an inverted U shape when viewed from the front-rear direction.

<Battery unit>
The battery unit 31 is a power source for the electric hydraulic excavator 200 . As shown in FIGS. 2 to 4, the battery unit 31 is provided near the center of the rear part on the base plate 11. As shown in FIGS. As shown in FIGS. 3 and 4, the battery unit 31 of this embodiment is assembled by vertically stacking a plurality of (four in this embodiment) battery modules 32 .

Each battery module 32 accommodates a plurality of battery bodies therein. A battery circuit is configured by electrically connecting the battery main body to the entire battery unit 31 . A sensor box 34 is provided at the rear of each battery module 32 . Various sensors, contactors, and the like are housed inside the sensor box 34 . A service plug 35 is provided in the uppermost sensor box 34 so as to protrude backward from the sensor box 34 . By pulling out the service plug 35, the battery circuit of the battery unit 31 is cut off.

The uppermost battery module 32 has a shorter front-to-rear dimension than the other battery modules 32 . Therefore, the front portion of the upper surface of the second battery module 32 from the top is exposed upward without the uppermost battery module 32 being stacked thereon. The portion is closed by the first lid portion 31f. The upper surface of the uppermost battery module 32 is closed by a second lid portion 31g.

As shown in FIG. 2, a pair of battery fans 140 (not shown in FIGS. 3 and 4) are provided on each of the first lid portion 31f and the second lid portion 31g at intervals in the width direction. . Battery fan 140 blows the air inside battery unit 31 upward. As a result, in the battery unit 31, the air flowing from below the lowermost battery module 32 flows upward while cooling the battery body. Then, the air is discharged to the outside of the battery unit 31 through the battery fan 140 provided on the first lid portion 31f and the second lid portion 31g.

The battery unit 31 is fixed on the rear vertical partition plate 16 at both left and right ends of the lower surface. The battery unit 31 is configured such that only the front portion of the battery unit 31, which is composed of the front portions of a plurality of battery modules 32 excluding the uppermost battery module 32, is inserted through the inside of the gate-shaped frame 20 forming an inverted U shape. It is arranged on the front side of the portal frame 20 .

<Inverter>
As shown in FIGS. 2 to 4, the inverter 36 is provided on the second lid portion 31g of the battery unit 31 via a frame-shaped carrier 36a. The inverter 36 converts the DC power supplied from the battery unit 31 into AC power.

<Power delivery unit>
The power delivery unit 37 is provided on the right side of the battery unit 31 on the base plate 11, as shown in FIGS. The power delivery unit 37 supplies DC power charged in the battery unit 31 to the inverter 36 . That is, the inverter 36 is supplied with DC power from the battery unit 31 via the power delivery unit 37 . The power delivery unit 37 is provided with various electric devices such as a contactor, a DC-DC converter, and an onboard charger.

<Charging connector connection>
The charging connector connecting portion 38 is provided on the battery unit 31 as shown in FIGS. 2 to 4 . Like the inverter 36, the charging connector connecting portion 38 is fixed to a carrier 36a (not shown in FIG. 2) fixed on the second cover portion 31g of the battery unit 31. As shown in FIG. The charging connector connecting portion 38 is arranged directly above the sensor box 34 . The charging connector connecting portion 38 has a normal charging port and a quick charging port.
The power delivery unit 37 electrically connects the battery unit 31 , the inverter 36 and the charging connector connecting portion 38 .

<Electric motor>
The electric motor 39 is driven by AC power supplied from the inverter 36 . As shown in FIGS. 2 and 3 , the electric motor 39 is provided on the left side of the battery unit 31 . The electric motor 39 is provided such that its drive shaft extends in the front-rear direction.

<Hydraulic pump>
The hydraulic pump 51 is driven by the rotation of the drive shaft of the electric motor 39 to discharge hydraulic oil. The hydraulic pump 51 is provided in front of the electric motor 39 on the base plate 11 and near the front and rear positions of the lateral partition plate 12, as shown in FIG. The hydraulic pump 51 is arranged such that its rotating shaft extends in the front-rear direction. An electric motor 39 is provided behind the hydraulic pump 51 via a partition wall 24 .

As shown in FIG. 3, the hydraulic pump 51 is provided above the base plate 11 with a space therebetween by being supported by a support portion (not shown). The axis of the rotary shaft of the hydraulic pump 51 extends in the front-rear direction so as to coincide with the rotary axis of the drive shaft of the electric motor 39 . A rotary shaft of the hydraulic pump 51 is connected to a drive shaft of the electric motor 39 .

<Hydraulic valve>
The hydraulic valve 52 is provided on the base plate 11 on the left side of the front vertical partition plate 13 and on the front side of the horizontal partition plate 12, as shown in FIG. The hydraulic valve 52 is connected to the hydraulic pump 51 . The hydraulic valve 52 distributes hydraulic fluid discharged from the hydraulic pump 51 to hydraulic equipment such as various hydraulic cylinders.

<Operation pattern switching part>
The operation pattern switching unit 53 is connected to the hydraulic valve 52 and changes the distribution destination of the hydraulic oil by the hydraulic valve 52 by changing the setting by the maintenance worker. As a result, the hydraulic cylinder that is moved by the driver's manipulation of various levers is changed. As a result, the operation pattern of various lever operations by the driver can be switched.
As shown in FIG. 2, the operation pattern switching unit 53 is arranged on the left side (outside in the width direction) of the hydraulic valve 52 in plan view.

<Swivel motor>
The swing motor 70 is a hydraulically driven motor rotationally driven by hydraulic oil supplied from the hydraulic valve 52 . The swing motor 70 is provided so as to pass through the base plate 11 at a position between the pair of front vertical partition plates 13 on the base plate 11 . The rotating motor 70 has the axis of the rotating shaft aligned in the vertical direction. By hydraulically driving the swing motor 70, the driving force of the swing motor 70 is transmitted to the swing circle 215 via a swing pinion (not shown). As a result, the upper rotating body 220 is driven to rotate with respect to the lower traveling body.

<Auxiliary Battery 64>
The auxiliary battery 64 is provided in the side region S of the right front portion of the base plate 11, as shown in FIG. The auxiliary battery 64 is provided on the front side of the horizontal partition plate and on the right side of the right front vertical partition plate. The auxiliary battery 64 is fixed on the base plate 11 as shown in FIG. The auxiliary battery 64 supplies power to auxiliary equipment such as lights and various controllers. The auxiliary battery 64 is charged via the DC-DC converter of the power delivery unit 37 .

<Oil tank>
The oil tank 65 is provided in front of the side region S on the base plate 11, as shown in FIG. The oil tank 65 is provided in front of and above the auxiliary battery 64, as shown in FIG. The oil tank 65 is provided above the base plate 11 via a support portion (not shown). The oil tank 65 stores hydraulic oil to be supplied to each hydraulic cylinder and each hydraulic motor.

<Driving space>
The operating space 80 is a portion where an operator rides and the electric hydraulic excavator 200 is operated by the operator. As shown in FIG. 2, the operating space 80 is provided in the leftward portion of the upper front portion of the upper revolving body 220 .

The operating space 80 has a floor panel 81 . The floor panel 81 forms the floor surface of the operating space 80 . The floor panel 81 covers the hydraulic valve 52 , the operation pattern switching unit 53 and the swing motor 70 from above. The operator can enter the operating space 80 from the left side of the opened floor panel 81 .

As shown in FIGS. 3 and 4 , the operating space 80 is partitioned above and forward of the front portion of the battery unit 31 by an operating space partition panel 82 . The operating space partition panel 82 has a horizontal panel 82a and upper and lower panels 82b.

The horizontal panel 82a has a plate-like shape extending in the front-rear direction and width direction with a space above the first lid portion 31f of the battery unit 31 . A rear end of the horizontal panel 82a is fixed to the beam portion 22 of the portal frame 20 across the width direction. The front end of the horizontal panel 82 a is located forward of the front surface of the front portion of the battery unit 31 .

The upper and lower panels 82b are plate-shaped and extend in the vertical and width directions. The upper ends of the upper and lower panels 82b are connected to the front ends of the horizontal panels 82a. The lower ends of the upper and lower panels 82 b are positioned at the height of the pair of front vertical partition plates 13 . Various controllers may be accommodated in the space on the rear side of the upper and lower panels 82b.

The operating space 80 is partitioned from the right side by a side partition panel 83, as shown in FIGS. The side partition panel 83 is a panel extending in the front-rear direction and the up-down direction.
As shown in FIG. 1, a driver's seat 84 is provided in the operating space 80 . An operator who operates the electric hydraulic excavator 200 sits in the driver's seat 84 . A driver's seat 84 is fixed on a horizontal panel 82a of the driver's space partition panel 82 shown in FIGS.
A console box (not shown) is provided on each of the left and right sides of the driver's seat 84 . Various controllers and the like are accommodated in the console box. An operation lever is provided in front of the console box and the driver's seat 84 . The operation patterns of these operation levers are switched by the operation pattern switching unit 53 described above. The operating space 80 is covered with a canopy 90 from above. A rear portion of the canopy 90 is supported by the portal frame 20 .

<Protector>
As shown in FIGS. 1 and 6, a pair of protectors 95 are provided at both rear and lower corners of the upper revolving body 220 at intervals in the width direction. The protector 95 is made of a high-strength member such as steel. The protectors 95 are integrally fixed to both corners of the rear end of the base plate 11 and extend upward. The protector 95 protects the upper revolving body 220 from an impact when the rear portion of the upper revolving body 220 collides during revolving.

<Exterior cover>
The exterior cover 100 is a cover that forms the outer shape of the upper revolving body 220, as shown in FIGS. Various devices of the upper revolving body 220 are accommodated inside the exterior cover 100 . The exterior cover 100 has a rear cover 110 , a left cover 120 and a right cover 130 .

<Rear cover>
As shown in FIGS. 1 and 5 , the rear cover 110 forms the rear portion of the exterior cover 100 . The rear cover 110, as shown in FIGS. It is covered from above and from both sides in the width direction.

<Left cover>
As shown in FIG. 1, left cover 120 forms the left portion of exterior cover 100 . The left cover 120 covers the hydraulic pump 51, the hydraulic valve 52, and the operation pattern switching section 53 from the left, as shown in FIG.

<Right cover>
The right cover forms the right portion of the exterior cover 100, as shown in FIG. The right cover 130 has an outer wall panel 131 and an opening/closing panel 132 .

As shown in FIG. 2, the outer wall panel 131 covers the side area S on the base plate 11 where the auxiliary battery 64 and the oil tank 65 are arranged from the right side. The outer wall panel 131 extends longitudinally and vertically. The rear end of the outer wall panel 131 is connected to the front end of the rear cover 110 . The side region S is partitioned from the left and right by the outer wall panel 131 and the side partition panel 83 .

As shown in FIGS. 5 and 6, the outer wall panel 131 is formed with a first opening 131a and a second opening 131b communicating with the outer wall panel 131 in the width direction. The first opening 131 a is formed in the rear portion of the outer wall panel 131 . The second opening 131b is formed in the front portion of the outer wall panel 131 on the front side of the first opening 131a. The opening area of the first opening 131a is larger than the opening area of the second opening 131b. The first opening 131a and the second opening 131b are each formed by arranging a plurality of slits extending in the front-rear direction side by side in the vertical direction.

As shown in FIG. 5, the lower part of the outer wall panel 131 is provided with a door portion 131c that can be opened and closed. By opening the door portion 131c, the auxiliary battery 64 can be accessed from the outside.

The opening/closing panel 132 covers the base plate 11 from above and from the front. As shown in FIG. 5, the opening/closing panel 132 is provided rotatably around an axis extending in the width direction at the lower portion of the front end of the right cover 130 . By rotating the opening/closing panel 132, the side area S is opened. This allows the inside of the side area S to be accessed from the outside.

<Cooling device>
Next, the cooling device 150 of this embodiment will be described. The cooling device 150 cools each device of the electric hydraulic excavator 200 . The cooling device 150 is provided in the side region S on the base plate 11, as shown in FIG. As shown in FIG. 4, the cooling device 150 is provided above the base plate 11 and the auxiliary battery 64 via a support portion (not shown).
The cooling device 150 has a cooling unit 151, a first air guide member 180 and a second air guide member 190, as shown in FIG.

<Cooling unit>
The cooling unit 151 is provided at a position in the front-rear direction between the first opening 131a and the second opening 131b in the side region S on the base plate 11 . Cooling unit 151 is provided along the inner surface of outer wall panel 131 in right cover 130 . In this embodiment, the widthwise outer surface of the cooling unit 151 is in contact with the inner surface of the outer wall panel 131 .
The cooling unit 151 has a cooling fan 160 and a heat exchange section 170 .

<Cooling fan>
Cooling fan 160 blows air in the front-rear direction. The cooling fan 160 has a fan body 161 and a casing 162 .
The fan main body 161 has a plurality of blades that rotate around the axis. The fan main body 161 is arranged with its axis aligned in the front-rear direction. The fan main body 161 is driven by a fan motor (not shown) to blow air in the front-rear direction. The cooling fan 160 of this embodiment blows air from the rear side toward the front side.
The casing 162 has a frame shape surrounding the fan main body 161 from the outer peripheral side. A fan main body 161 is accommodated in the casing 162 . The casing 162 is provided with a shroud (not shown) whose inner peripheral surface faces the outer peripheral surface of the fan body 161 .

The cooling fan 160 is arranged at a position close to the second opening 131b on the side region S on the base plate 11 . The cooling fan 160 is provided at a front-rear position along the rear edge of the second opening 131b. An oil tank 65 is arranged on the front side of the cooling fan 160 with a space therebetween. The cooling fan 160 has a rectangular shape with the front-rear direction as the lateral direction and the width direction as the longitudinal direction in a plan view.

<Heat exchange part>
Heat exchange unit 170 cools the heat exchange medium by exchanging heat between the heat exchange medium flowing inside and the air blown by cooling fan 160 .
Heat exchanging portion 170 is provided so as to face the rear side of cooling fan 160 . The heat exchange portion 170 is integrally provided on the rear side of the cooling fan 160 . The heat exchange portion 170 has dimensions in the width direction and the vertical direction corresponding to the cooling fan 160 . The heat exchange portion 170 is formed with a large number of communication portions through which air can flow in the front-rear direction. The air blown by driving the cooling fan 160 circulates through the communicating portion of the heat exchanging portion 170, and heat exchange is performed between the air and the heat exchanging medium.

The heat exchange section 170 has a plurality of heat exchangers. In this embodiment, a radiator 171, a second oil cooler 172 and a first oil cooler 173 are provided as a plurality of heat exchangers.
<Radiator>
Cooling water flows inside the radiator 171 as a heat exchange medium. The radiator 171 is connected to the inverter 36 and the power delivery unit 37 via piping. The cooling water circulates through the radiator 171 , the inverter 36 and the power delivery unit 37 through piping by driving the pump, thereby cooling the inverter 36 and the power delivery unit 37 .

<Second oil cooler>
Cooling oil flows inside the second oil cooler 172 as a heat exchange medium. The second oil cooler 172 is connected to the electric motor 39 via piping. The cooling oil circulates through the second oil cooler 172 and the electric motor 39 through piping by driving the pump. As a result, the lubricating property of the sliding portion of the electric motor 39 is ensured and the electric motor 39 is cooled with oil.

<First oil cooler>
Hydraulic oil flows through the first oil cooler 173 as a heat exchange medium. That is, hydraulic oil that flows through the oil tank 65, the hydraulic pump 51, and the hydraulic valve 52 is introduced into the first oil cooler 173 via the pipe.
In this embodiment, the temperature of the cooling oil supplied to the second oil cooler 172 is higher than that of the cooling water supplied to the radiator 171 . The temperature of the hydraulic oil supplied to the first oil cooler 173 is higher than that of the cooling oil supplied to the second oil cooler 172 . The temperatures of these cooling water, cooling oil, and hydraulic oil are determined by the equipment to be cooled by these heat exchange media.

Air flows through the radiator 171, the second oil cooler 172, and the first oil cooler 173 so as to pass through them in the front-rear direction. The radiator 171, the second oil cooler 172, and the first oil cooler 173 have a rectangular shape extending in the width direction and the up-down direction when viewed from the front-rear direction. The radiator 171, the second oil cooler 172 and the first oil cooler 173 may be surrounded by a frame from the outer peripheral side.

The radiator 171, the second oil cooler 172, and the first oil cooler 173 are fixed and integrated so as to be sequentially stacked in the front-rear direction. In the heat exchange section 170 of the present embodiment, the radiator 171, the second oil cooler 172, and the first oil cooler 173 are arranged in this order from the rear side to the front side, that is, in the direction in which air is circulated by the cooling fan 160. are placed.

<First wind guide member>
As shown in FIG. 6 , the first air guide member 180 is provided on the rear side of the heat exchanging portion 170 on the side region S of the base plate 11 . The first air guiding member 180 has a plate shape extending toward the front side, which is the heat exchanging portion 170 side, as it goes inward in the width direction from the first opening portion 131a. That is, the first air guide member 180 extends forward so as to be inclined with respect to the width direction as it goes inward in the width direction. A first guide surface 181 is a surface of the first air guide member 180 facing forward and outward in the width direction.

The first air guide member 180 is provided at a position in the front-rear direction corresponding to the first opening 131a. A rear end and widthwise outer end of the first air guide member 180 is connected to the rear edge of the first opening 131 a on the inner surface of the outer wall panel 131 . The front end and widthwise inner end portion of the first air guide member 180 is connected to the widthwise inner end portion of the rear end surface of the heat exchanging portion 170 (inlet 152 of the cooling unit 151). As a result, the first air guide member 180 has an inlet-side flow path F1 in the side region S on the base plate 11 that allows the first opening 131a to communicate with the rear end surface serving as the air inlet 152 of the cooling unit 151. forming In a plan view, the inlet-side flow path F1 has, for example, a right triangle shape with the first guide surface 181 as the oblique side and the first opening 131a and the rear end surface of the cooling unit 151 as two sides. No device that generates heat is provided in the inlet-side flow path F1. That is, the inlet-side flow path F1 directly connects the first opening 131a and the inlet 152 of the cooling unit 151 without any device.

<Second wind guide member>
The first air guide member 180 is provided on the side region S of the base plate 11 on the rear side of the cooling fan 160, as shown in FIG. The second air guide member 190 has a plate shape extending toward the rear side, which is the side of the cooling fan 160, toward the inner side in the width direction from the second opening 131b. That is, the second air guide member 190 extends rearward so as to be inclined with respect to the width direction as it goes inward in the width direction. A second guide surface 191 is a surface of the second air guide member 190 facing rearward and outward in the width direction.

The second air guide member 190 is provided at a position in the front-rear direction corresponding to the second opening 131b. The front end of the second air guide member 190 and the widthwise outer end are connected to the front edge of the second opening 131b on the inner surface of the outer wall panel 131 . The rear end and widthwise inner end portion of the second air guide member 190 is connected to the widthwise inner end portion of the front end surface of the cooling fan 160 (outlet 153 of the cooling unit 151). As a result, the second air guide member 190 is provided in the side region S on the base plate 11, and the second opening 131b and the front end surface serving as the air outlet 153 of the cooling unit 151 are communicated with each other. forming In plan view, the outlet-side flow path F2 has, for example, a right triangle shape with the second guide surface 191 as the oblique side and the second opening 131b and the front end surface of the cooling unit 151 as two sides. No equipment that serves as a heat source is provided in the outlet-side channel F2. That is, the outlet-side channel F2 directly connects the second opening 131b and the outlet 153 of the cooling unit 151 without any device.

A blocking plate may be provided to block the inlet-side flow path F1 and the outlet-side flow path F2 from above and below. The longitudinal dimension D2 of the second air guide member 190 is shorter than the longitudinal dimension D1 of the first air guide member 180 . As a result, the volume of the outlet-side channel F2 formed by the second air guide member 190 is smaller than the volume of the inlet-side channel F1 formed by the first air guide member 180 . An oil tank 65 is arranged on the front side of the second air guide member 190 .

<Effect>
When the electric hydraulic excavator 200 is in operation, the heat exchange section 170 of the cooling unit 151 is supplied with a heat exchange medium heated to a high temperature by cooling various devices. As the cooling fan 160 is driven, air flows from the rear to the front so as to pass through the heat exchange section 170, thereby cooling the heat exchange medium.

That is, when the cooling fan 160 is driven around the longitudinal axis, air flows from the rear to the front within the side regions S on the base plate 11, as shown in FIG. As a result, air is introduced into the inlet-side flow path F1 partitioned by the first air guide member 180 through the first opening 131a of the outer wall panel 131. In accordance with the inclination of the first guide surface 181 of the wind member 180, the wind member 180 is guided inward in the width direction and forward.

The air guided to the front end face of the heat exchanging portion 170 exchanges heat with the heat exchanging medium when flowing forward through the heat exchanging portion 170, thereby cooling the heat exchanging medium. The cooled heat exchange medium is supplied to each device again. The air heated by passing through the heat exchange section 170 is pumped further forward by the cooling fan 160 . As a result, the air is introduced into the outlet-side channel F2 partitioned by the second air guide member 190 . The air in the outlet-side flow path F2 flows forward and outward in the width direction according to the inclination of the second guide surface 191 of the second air guide member 190 . Then, the air is discharged to the outside of the outer wall panel 131 through the second opening 131b.

Here, for example, in the case where a turning area is formed in either the front or the rear of the cooling unit 151 so as to reverse the direction of air flow, in order to achieve smooth air flow while suppressing pressure loss of the air, a large capacity is required. It is necessary to secure a turning area. Therefore, it becomes difficult to achieve both securing of cooling efficiency and space saving.

On the other hand, in the cooling device 150 of the present embodiment, the first air guide member 180 and the first air guide member 180 extending from the outer wall panel 131 at an angle inward in the width direction and in the front-rear direction with respect to the cooling unit 151 through which air flows in the front-rear direction. Air is introduced and discharged via the second air guide member 190 . As a result, the air diverting area in the side area S inside the outer cover 100 is divided into two parts (the inlet side channel F1 and the outlet side channel F2) on the upstream side and the downstream side of the cooling unit 151. . Therefore, since the turning angle can be suppressed in each of the inlet-side flow path F1 and the outlet-side flow path F2, there is no need to inadvertently secure a large volume for these inlet-side flow path F1 and the outlet-side flow path F2. In addition, since the turning angle of the air is suppressed, the air can be smoothly circulated, and the heat exchange efficiency can be improved.

Furthermore, in the cooling device 150 of the present embodiment, the inlet-side flow path F1 and the outlet-side flow path F2 formed by the first baffle member 180 and the second baffle member 190 are triangular in plan view. . Therefore, in the inlet-side channel F1 and the outlet-side channel F2, the volume can be suppressed while ensuring the channel cross-sectional area. Therefore, a compact configuration can be realized while ensuring smooth air circulation.

In this embodiment, the cooling fan 160 blows air from the rear side toward the front side. As a result, air flows in from the first opening 131a formed on the rear side, and air flows out from the second opening 131b formed on the front side.
Here, in the electric hydraulic excavator 200, since the work machine 221 is provided in the front part of the upper revolving body 220, the area on the front side of the upper revolving body 220 is prone to dust and dirt, and the cleanliness of the air is low. is low.
In this embodiment, since the air flows in from the first opening 131a on the rear side, which has relatively high air cleanliness, it is possible to prevent dust from entering the cooling unit 151. FIG. Therefore, it is possible to suppress adhesion of dust and dirt to the cooling unit 151, and it is possible to maintain the cooling efficiency. Therefore, maintenance frequency can be suppressed.

The second air guide member 190 is provided between the outlet 153 of the cooling unit 151 and the oil tank 65 . If the second air guide member 190 were not provided, the air flowing out from the cooling unit 151 would continue forward and collide with the oil tank 65 . The air that hits the oil tank 65 and soars up enters the operating space 80 through a gap or the like in the side partition panel 83 that separates the operating space 80 from the operating space 80 . In this case, the operator in the driver's seat 84 and the devices such as the controller housed in the console box are exposed to high temperatures, which is not preferable.
In this embodiment, the second air guide member 190 also functions as a shield plate between the oil tank 65 and the cooling unit 151, so the above inconvenience can be resolved.

The heat exchange section 170 of this embodiment has a radiator 171, a second oil cooler 172, and a first oil cooler 173 that are sequentially arranged from rear to front. As a result, the cooling water, the cooling oil, and the working oil can be efficiently cooled collectively.
Also, generally, the temperature increases in the order of cooling water, cooling oil, and hydraulic oil. In this embodiment, since the heat exchanger with a low temperature of the heat exchange medium is arranged on the rear side, which is the upstream side of the air, heat exchange of each of the radiator 171, the second oil cooler 172, and the first oil cooler 173 The medium can be properly cooled.

Furthermore, in this embodiment, devices such as the inverter 36 , the power delivery unit 37 , the electric motor 39 , the hydraulic pump 51 , the hydraulic valves 52 and the like are arranged in a region different from the cooling device 150 on the base plate 11 . Therefore, these devices are not arranged in the air circulation path of the cooling device 150 . Therefore, air heated by other equipment is not introduced into the cooling unit 151, and the cooling performance of the cooling unit 151 can be ensured.

Further, in this embodiment, the battery unit 31 is cooled separately from the cooling device 150 by the battery fan 140 provided in the battery unit 31 . Therefore, the air that has cooled the battery body in the battery unit 31 is not introduced into the cooling unit 151 . Therefore, in the same manner as described above, only air that has not been heated by other devices can be introduced into the cooling unit 151, and the cooling performance of the cooling unit 151 can be ensured.

<Other embodiments>
Although the embodiment of the present invention has been described above, the present invention is not limited to this and can be modified as appropriate without departing from the technical idea of the invention.

In the embodiment, it has been described that the heat exchange section 170 is composed of three heat exchangers, the radiator 171 , the second oil cooler 172 and the first oil cooler 173 . However, it is not limited to this, and the heat exchange section 170 may be composed of only one heat exchanger, or may be composed of two or four or more heat exchangers. Also, a heat exchanger may be provided to cool a heat exchange medium other than cooling water, cooling oil, and hydraulic oil.

The side region S may be arranged on the left side of the base plate 11 . In this case, the cooling device 150 is provided along the left cover 120, and a pair of openings are formed in the driver's seat 84 for sucking and discharging air.

Although the electric hydraulic excavator 200 has been described as an example of the electric construction machine in the embodiment, the construction machine is not limited to this. For example, the present invention may be applied to an electric excavator in which the work machine 221 and the like are all electrically driven, and further to an electric hydraulic excavator to which electric power is supplied from the outside via a cable. The present invention may also be applied to other construction machines such as hydraulic excavators equipped with engines.

DESCRIPTION OF SYMBOLS 10... Revolving frame 11... Base plate 12... Horizontal partition plate 13... Front vertical partition plate 14... Front reinforcing plate 15... Bracket 16... Rear vertical partition plate 20... Portal frame 21... Column Part 22 Beam 31 Battery unit 31f First cover 31g Second cover 32 Battery module 34 Sensor box 35 Service plug 36 Inverter 36a Carrier 37 Power delivery unit 38 Charging connector connection part 39 Electric motor 51 Hydraulic pump 52 Hydraulic valve 53 Operation pattern switching part 64 Auxiliary battery 65 Oil tank 70 Turning motor 80... Operating space 81... Floor panel 82... Operating space partition panel 82a... Horizontal panel 82b... Upper and lower panel 83... Side partition panel 84... Driver's seat 90... Canopy 95... Protector 100... Exterior Cover 110... Rear cover 120... Left cover 130... Right cover 131... Outer wall panel 131a... First opening 131b... Second opening 131c... Door part 132... Open/close panel 140... Battery fan , 150... Cooling device, 151... Cooling unit, 152... Inlet, 153... Outlet, 160... Cooling fan, 161... Fan body, 162... Casing, 170... Heat exchanging part, 171... Radiator, 172... Second oil cooler, DESCRIPTION OF SYMBOLS 173... First oil cooler, 180... First air guide member, 181... First guide surface, 190... Second air guide member, 191... Second guide surface, 200... Electric hydraulic excavator, 210... Undercarriage, 211... Crawler track, 212... Blade, 215... Swing circle, 220... Upper revolving body, 221... Work machine, 222... Boom, 223... Arm, 224... Bucket, S... Side area, F1... Entrance side flow path, F2 …Outlet flow path

Claims (5)

a horizontally extending base plate;
an exterior cover covering a region of the predetermined space on the base plate from the outside in the width direction and having an outer wall panel formed with a first opening and a second opening on the front side of the first opening;
a cooling device provided along the outer wall panel on the inner side of the base plate in the exterior cover in the width direction,
The cooling device is
A cooling fan provided between the first opening and the second opening to blow air from the rear side to the front side, and a heat exchange medium circulating inside facing the cooling fan. and a cooling unit having a heat exchange portion through which air can flow in the front-rear direction;
a first air guide member extending toward the cooling unit from the first opening toward the inner side in the width direction;
a second air guide member extending toward the cooling unit from the second opening toward the inner side in the width direction;
has
The construction machine further comprising an oil tank that is provided on the base plate in front of the second air guide member and stores hydraulic oil. The heat exchange part is
Having a plurality of heat exchangers arranged in the front-rear direction,
In the heat exchangers, the temperature of the heat exchange medium heat-exchanged by the heat exchange medium circulating therein is lower in the heat exchangers located upstream of the air blown by the cooling fan. Construction equipment as described. The plurality of heat exchangers are
a radiator through which cooling water flows as the heat exchange medium;
a second oil cooler through which cooling oil flows as the heat exchange medium;
a first oil cooler through which hydraulic oil flows as the heat exchange medium;
including
The construction machine according to claim 2, wherein the radiator, the second oil cooler, and the first oil cooler are arranged in this order toward the downstream side of the air blown by the cooling fan. an inverter that converts power supplied from a power source;
an electric motor driven by the power converted by the inverter;
a hydraulic pump that discharges the hydraulic oil by being driven by the electric motor;
with
4. The construction machine according to claim 3, wherein said inverter, said electric motor and said hydraulic pump are provided on said base plate in a region different from said cooling device. further comprising a battery unit as a power supply provided in a region different from the cooling device on the base plate;
The construction machine according to any one of claims 1 to 3, wherein the battery unit has a battery fan that causes air to flow in from below the battery unit and flow out upward.

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