JP2016138403A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction machine capable of preventing water droplets generated in an evaporator from flowing toward an electrical storage device, allowing the electrical storage device to be easily replaced.SOLUTION: A revolving super structure 4 is provided with an electrical storage unit 22 for storing the power to drive a generator/motor 11 for assisting and a generator/motor 19 for revolving. The electrical storage unit 22 includes a cooling device 23 which generates cooling wind and an electrical storage device 30 which is disposed separately from the cooling device 23 and cooled by cooling wind supplied from the cooling device 23. The electrical storage device 30 is detachably fitted to the cooling device 23.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a construction machine such as a hydraulic excavator or a wheel loader, and more particularly to a construction machine provided with a generator / motor as a power source.

  In general, a hydraulic excavator as a typical example of a construction machine has a vehicle body that includes a lower traveling body that can be self-propelled and an upper revolving body that is rotatably mounted on the lower traveling body. In addition, a work device for performing excavation work or the like is provided on the front side of the upper swing body.

  Here, some hydraulic excavators use an engine and a generator / motor together to drive a hydraulic pump that supplies pressure oil to various actuators. This hybrid hydraulic excavator is equipped with a power storage device that stores electrical energy for driving an assisting generator / motor.

  Here, the hydraulic excavator often works outdoors, and depending on the outdoor work environment, the work may be performed while being exposed to a high temperature state due to temperature or sunlight. On the other hand, the power storage device is easily deteriorated under a high temperature environment and its life is shortened.

  Thus, some hybrid hydraulic excavators include a cooling device for cooling the power storage device. The cooling device has an arrangement in which an evaporator through which a refrigerant flows is arranged in a cooling passage in which the power storage device is arranged, and a cooling air cooled by the evaporator is made to flow through the cooling passage toward the power storage device by a fan. (For example, refer to Patent Document 1).

JP 2002-31441 A

  Here, since the cooling device by patent document 1 is provided with the evaporator cooled with a refrigerant | coolant, since this evaporator is cooled below to external temperature, a water droplet generate | occur | produces in a cooling channel | path by dew condensation. In this case, water droplets generated by the evaporator may flow to the power storage device side through the cooling passage, and if attached to the power storage device, a dielectric breakdown or a short circuit may occur.

  On the other hand, a hydraulic excavator has a severe usage environment and work contents, and even if the power storage device is sufficiently cooled, the power storage device may deteriorate and need to be replaced. In this case, in Patent Document 1, the power storage device, the evaporator, and the fan are accommodated in a case that is internally a cooling passage. In addition, the case is equipped with a power cut-off mechanism for protecting the power storage device, a control mechanism for feeding and receiving power, etc. Exchange is desired.

  However, in the replacement work for each case, in order to disconnect the refrigerant pipe connected to the evaporator, it is necessary to carry out the refrigerant extraction work and the filling work, which requires a lot of labor for the replacement work. There is a problem.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to prevent water droplets generated by an evaporator from flowing to the power storage device side and to easily perform a replacement operation of the power storage device. It is to provide a construction machine that can be used.

  A construction machine according to the present invention includes a self-propelled vehicle body, a generator / motor mounted on the vehicle body, and a power storage unit that is mounted on the vehicle body and stores electric power for driving the generator / motor.

  In order to solve the above-described problems, the configuration of the invention of claim 1 is characterized in that the power storage unit is provided separately from the cooling device that generates cooling air and the cooling device, and is supplied from the cooling device. The power storage device is configured to be attached to the cooling device and detachably attached to the cooling device.

  The invention of claim 2 is that the power storage device of the power storage unit is configured to be stacked on the upper side of the cooling device.

  According to a third aspect of the present invention, the cooling case constituting the cooling device is provided with a pair of upward fitting cylinders located on the upper surface side thereof, and the electricity storage case constituting the power storage device is located on the lower surface side thereof. A pair of downward fitting cylinders to be fitted to the respective upward fitting cylinders, and the power storage device is attached so that the downward fitting cylinder is attached to the upward fitting cylinder of the cooling device and can be removed. It is in the structure which matches.

  According to a fourth aspect of the present invention, of the pair of upward fitting cylinders of the cooling case, one upward fitting cylinder has a cooling air return duct opened upward, and the other upward fitting cylinder has a cooling duct. The wind supply duct is opened upward, and one of the pair of downward fitting cylinders of the electricity storage case has one of the downward fitting cylinders having an outlet duct connected to the return duct opened downward and the other downward In the fitting cylinder, an inflow duct connected to the supply duct is opened downward.

  According to a fifth aspect of the present invention, the cooling device for the power storage unit includes a cooling case attached to the vehicle body side, an evaporator provided in the cooling case to cool the cooling air by circulating a refrigerant, and the cooling case A return duct that cools the power storage device and is heated to return to the evaporator and returns to the inside of the cooling case, and is provided in the cooling case on the opposite side of the return duct across the evaporator. A supply duct that supplies cooling air to the power storage device, and a fan that is provided in the cooling case and blows the cooling air that has passed through the evaporator and is cooled toward the supply duct. The power storage device stores power in a power storage case provided separately from the cooling case so as to face the cooling case of the cooling device. For this purpose, an electricity storage member provided in the electricity storage case and cooled by the cooling air, an inflow duct provided in the electricity storage case and connected to the supply duct to allow cooling air to flow into the electricity storage member, and the electricity storage member And an outflow duct that is located on the opposite side of the inflow duct with respect to the inflow duct, is provided in the power storage case, is connected to the return duct, and flows out the cooling air after passing through the power storage member.

  According to a sixth aspect of the present invention, the power storage member of the power storage device includes a storage box in which the inflow duct and the outflow duct are connected at a position facing the length of the storage space, and a storage space in the storage box. It is composed of a plurality of power storage units arranged side by side, and the connection port between the storage box and the inflow duct and the connection port between the storage box and the outflow duct are each formed as a wide opening extending like a slit. It is to have done.

  According to the first aspect of the present invention, the power storage device cooled by the cooling air is configured to be attached to and removable from the cooling device that generates the cooling air. Therefore, even if water droplets due to condensation occur in the cooling device, since the power storage device is provided separately from the cooling device, it is possible to prevent the water droplets from flowing to the power storage device side. On the other hand, when replacing the power storage device, only the power storage device can be removed while the cooling device remains on the vehicle body side.

  As a result, the power storage device can be protected from water droplets, and durability and life can be improved. On the other hand, in the replacement operation of the power storage device, it is not necessary to disconnect the refrigerant pipe connected to the evaporator that is generally used as a cooling means, and therefore the replacement operation of the power storage device can be easily performed.

  According to the second aspect of the present invention, since the power storage devices are stacked on the upper side of the cooling device, even if water droplets due to condensation occur in the cooling device located on the lower side, the water droplets are located on the upper side. It cannot flow into the power storage device. As a result, the life of the power storage device can be extended, and the power storage device can be attached to and detached from the cooling device simply by moving the power storage device upward and downward, and the workability during replacement can be improved.

  According to the invention of claim 3, by fitting the upward fitting cylinder of the cooling case and the downward fitting cylinder of the electricity storage case, the electricity storage case can be attached to the cooling case and detachably positioned. .

  According to the invention of claim 4, the cooling air supplied from the cooling case is stored through the supply duct and the inflow duct by connecting the return duct and the outflow duct and connecting the supply duct and the inflow duct. The cooling air that flows into the case and warms in the electricity storage case is returned to the cooling case through the outflow duct and the return duct. Thereby, the cooling air can be circulated and circulated between the cooling device and the power storage device.

  According to the invention of claim 5, when the cooling air heated by cooling the power storage device is returned into the cooling case through the return duct, the cooling device for the power storage unit cools the cooling air by the evaporator. Then, the cooling air cooled by the evaporator is blown to the supply duct side by the fan, and is supplied to the power storage device side through the supply duct.

  On the other hand, when the cooling power is supplied from the cooling device to the power storage device of the power storage unit, the cooling air flows into the power storage case through the inflow duct connected to the supply duct and cools the power storage member. The cooling air warmed by cooling the power storage member is discharged through the outflow duct to the return duct connected to the outflow duct.

  Therefore, in a state where the power storage device is attached to the cooling device, the power storage member can be constantly cooled by the cooling air cooled by the evaporator by circulating the cooling air through each duct. Also, by separating the supply duct, the return duct, the inflow duct, and the outflow duct, the power storage device can be separated from the cooling device, and only the power storage device can be replaced while the cooling device remains on the vehicle body side. it can.

  According to the invention of claim 6, the connection port between the storage box and the inflow duct and the connection port between the storage box and the outflow duct are each formed as a wide opening extending in a slit shape. Thus, the cooling air flowing into the storage box from the inflow duct of the power storage device can be circulated in a wide range within the storage space of the storage box by the wide connection port located on the upstream side, and a plurality of power storage units can be connected. It can be cooled efficiently. On the other hand, the cooling air that has spread by cooling each power storage unit in the storage space of the storage box can be smoothly discharged to the outflow duct side by the wide connection port located on the downstream side. It can be cooled efficiently.

1 is a front view showing a hydraulic excavator according to an embodiment of the present invention. It is a top view which expands and shows the upper turning body which abbreviate | omitted the exterior cover. It is sectional drawing which expands and shows the electrical storage unit arrange | positioned in the utility chamber of an upper revolving structure. It is sectional drawing which looked at the electrical storage unit from the arrow IV-IV direction in FIG. FIG. 4 is an exploded cross-sectional view showing a state where the power storage unit of FIG. 3 is separated into a cooling device and a power storage device. It is a disassembled perspective view which expands and shows the supply duct of a cooling device, the inflow duct of an electrical storage apparatus, and the electrical storage member in the isolate | separated state. It is a system circuit diagram of hydraulic equipment and electric equipment. It is a circuit block diagram which shows the flow of the refrigerant | coolant with respect to an air conditioner and an electrical storage unit.

  Hereinafter, as a construction machine according to an embodiment of the present invention, a hybrid hydraulic excavator using an engine and an assisting generator / motor in combination among hybrid hydraulic excavators and electric hydraulic excavators will be described as an example. This will be described in detail with reference to FIG.

  In the embodiment, the configuration in which the power generator / motor for turning is driven by the power generated by the power generator / motor for assist is exemplified, but the present invention is not limited to this, and other motors such as a traveling motor are used. It may be driven. In the case of an electric hydraulic excavator, only an electric motor may be used instead of the engine.

  In FIG. 1, reference numeral 1 denotes a hybrid hydraulic excavator as a construction machine. The hydraulic excavator 1 includes a self-propelled crawler-type lower traveling body 2, and a swing bearing device 3 provided on the lower traveling body 2. The upper swing body 4 is mounted on the lower traveling body 2 so as to be swingable via the swing bearing device 3, and is provided on the front side of the upper swing body 4 so as to be able to move up and down to perform excavation work of earth and sand. It is comprised with the working apparatus 5. FIG. The lower traveling body 2 and the upper swing body 4 constitute a vehicle body.

  The lower traveling body 2 includes a track frame 2A, drive wheels 2B provided on the left and right sides of the track frame 2A, and the front and rear sides of the drive wheel 2B. It includes an idler wheel 2C provided on both the left and right sides, and a crawler belt 2D wound around the drive wheel 2B and the idler wheel 2C (both shown only on the left side). The left and right drive wheels 2B are rotationally driven by left and right traveling motors 2E and 2F (see FIG. 7), which are hydraulic motors. On the other hand, a cylindrical body 2G is provided on the upper side of the central portion of the track frame 2A, and the slewing bearing device 3 is mounted on the cylindrical body 2G.

  The working device 5 includes a boom 5A attached to a revolving frame 6 to be described later so as to be able to move up and down, an arm 5B attached to the tip of the boom 5A so as to be able to move up and down, and rotatable to the tip of the arm 5B. And a boom cylinder 5D, an arm cylinder 5E, and a bucket cylinder 5F that are hydraulic cylinders that drive the bucket 5C.

  The upper swing body 4 has a swing frame 6 rotatably mounted on the lower traveling body 2 via the swing bearing device 3, and a cab 7, a counterweight 8, an engine 9, a hydraulic pressure, which will be described later, are mounted on the swing frame 6. A pump 10, an assisting generator / motor 11, a heat exchanger 12, a turning generator / motor 19, a power storage unit 22, and the like are provided.

  Reference numeral 6 denotes a revolving frame that forms a support structure for the upper revolving structure 4. As shown in FIG. 2, the swivel frame 6 is formed in a thick flat plate shape and extends in the front and rear directions, and extends in the front and rear directions with a spacing left and right on the bottom plate 6A. A left vertical plate 6B, a right vertical plate 6C, and a plurality of left-extending beams 6D extending from the left vertical plate 6B to the left, and a right extension from the right vertical plate 6C. A plurality of provided right overhanging beams 6E, a left side frame 6F extending in the rearward direction and fixed to the front end side of each left overhanging beam 6D, and a front side fixed to the front end side of each of the right overhanging beams 6E. , And a right side frame 6G extending rearward.

  Here, a slewing bearing device 3 is provided between the left and right vertical plates 6B and 6C at an intermediate portion in the front and rear directions of the bottom plate 6A. On the other hand, a working device 5 is attached to the front side of the left and right vertical plates 6B and 6C, and a counterweight 8 described later is attached to the rear of the left and right vertical plates 6B and 6C.

  Reference numeral 7 denotes a cab provided on the left side of the front portion of the revolving frame 6, and the cab 7 defines a cab in which an operator is boarded. Reference numeral 8 is a counterweight provided on the rear end side of the revolving frame 6, and the counterweight 8 balances the weight with the work device 5.

  Reference numeral 9 denotes an engine as a prime mover located on the front side of the counterweight 8 and disposed on the rear side of the turning frame 6. The engine 9 is disposed in an engine chamber 17 to be described later, and is mounted on the left and right vertical plates 6B and 6C of the revolving frame 6 in a horizontally placed state extending in the left and right directions. A cooling fan 9 </ b> A is attached to the left side of the engine 9, and a hydraulic pump 10 (described later) and an assisting generator / motor 11 are connected to the right side of the engine 9.

  On the other hand, the engine 9 is provided with an intake pipe 9B for sucking outside air, and the front end side of the intake pipe 9B extends to a utility chamber 18 which will be described later. An air cleaner 9C for cleaning is attached. Further, the engine 9 is provided with a compressor 13 </ b> A that forms a part of the outdoor unit of the air conditioner 13.

  Reference numeral 10 denotes a hydraulic pump provided on the right side of the engine 9. The hydraulic pump 10 pressurizes and discharges hydraulic oil as a power source for driving the traveling motors 2E, 2F of the lower traveling body 2 and the cylinders 5D, 5E, 5F of the work device 5. .

  Reference numeral 11 denotes an assisting generator / motor that drives the hydraulic pump 10 in cooperation with the engine 9. The assist generator / motor 11 generates electric power by being rotated by the engine 9 and stores the electric power in a power storage device 30 to be described later. Alternatively, the assist generator / motor 11 is rotated by electric power from the power storage device 30 to be added to the engine 9 and the hydraulic pump 10. Is assisted.

  Reference numeral 12 denotes a heat exchanger mounted on the revolving frame 6 on the left side of the engine 9. The heat exchanger 12 includes a support frame 12A, a radiator supported by the support frame 12A, an oil cooler, and the like (none of which are shown).

  Reference numeral 13 denotes an air conditioner (hereinafter referred to as an air conditioner 13) provided between the engine 9 and the cab 7. The air conditioner 13 supplies conditioned air according to the operator's preference into the cab 7. is there. As shown in FIG. 8, the air conditioner 13 is classified into an outdoor unit and an indoor unit. The outdoor unit is provided in the engine 9 and compresses and liquefies the vaporized refrigerant, and downstream of the compressor 13A. A condenser 13B which is disposed on the side of the heat exchanger 12 and cools the refrigerant liquefied by the compressor 13A, and a liquefied refrigerant and a non-liquefied refrigerant provided on the downstream side of the condenser 13B. The receiver 13C to be separated.

  The indoor unit of the air conditioner 13 is located on the downstream side of the receiver 13C and is provided in the cab 7 to inject the liquefied refrigerant in a mist form, and in the vicinity of the downstream side of the expansion valve 13D in a mist form. The refrigerant for the air conditioner 13E that cools by taking away the ambient heat by evaporating the refrigerant in the passage, the fan for sending air to pass through the evaporator 13E, and at least the evaporator 13E for the air conditioner are removed. An enclosing case (both not shown) is configured. The air conditioner 13 connects the evaporator 13E and the compressor 13A by the return side refrigerant pipe 13F, and the evaporator from the compressor 13A through the condenser 13B, the receiver 13C, and the expansion valve 13D by the feed side refrigerant pipe 13G. Up to 13E is connected.

  Here, in each of the refrigerant pipes 13F and 13G of the air conditioner 13, an electric storage unit evaporator 25 and an expansion valve 26 for generating cooling air by the electric storage unit 22 described later are provided via the bypass refrigerant pipe 25A. It is connected.

  A hydraulic oil tank 14 is located on the front side of the hydraulic pump 10 and mounted on the right side of the swivel frame 6. The hydraulic oil tank 14 stores hydraulic oil supplied to the hydraulic pump 10. A fuel tank 15 is located on the front side of the hydraulic oil tank 14 and is mounted on the revolving frame 6. The fuel tank 15 stores fuel supplied to the engine 9.

  Reference numeral 16 denotes a building cover provided on the revolving frame 6 located on the front side of the counterweight 8. The building cover 16 covers the engine 9, the hydraulic pump 10, the assist generator / motor 11, the heat exchanger 12, and the like mounted on the revolving frame 6. Here, the building cover 16 is located between the cab 7 and the counterweight 8 and covers the upper surface plate 16A covering the upper side of the engine 9 and the like, and from the left end of the upper surface plate 16A so as to face the heat exchanger 12. A left rear door 16B provided in a standing manner, a right door (not shown) provided in a standing manner from the right end of the top plate 16A so as to face the hydraulic pump 10, and the left rear door 16B A left front door 16 </ b> C provided between the cab 7 and the cab 7 is included.

  On the other hand, in the building cover 16, the front position of the heat exchanger 12 is extended to the left and right, and the rear partition plate 16 </ b> D is erected, and the cab 7 is positioned near the rear side of the left and right. A front partition plate 16 </ b> E extending in the direction and standing is provided. Thereby, in the building cover 16, an engine chamber 17 located on the rear side and surrounded by the counterweight 8, the hydraulic oil tank 14, the upper surface plate 16A, the left rear door 16B, the rear partition plate 16D, and the like, A utility chamber 18 surrounded by the upper surface plate 16A, the left front door 16C, the rear partition plate 16D, the front partition plate 16E, and the like is defined.

  The engine chamber 17 houses the engine 9, the hydraulic pump 10, the assisting generator / motor 11, the heat exchanger 12, and the like, and the utility chamber 18 houses the air cleaner 9C of the engine 9, the power storage unit 22 described later, and the like. ing. A mounting plate 18A is provided in the utility chamber 18 so as to be positioned above the left overhanging beam 6D and the left side frame 6F of the swivel frame 6. For example, the cooling device 23 of the power storage unit 22 described later includes a mounting plate 18A. Installed on top.

  Reference numeral 19 denotes a turning generator / motor that constitutes a power source of the slewing bearing device 3. The turning generator / motor 19 is composed of an electric motor mounted near the center of the bottom plate 6A of the turning frame 6, and has a gear (not shown) that meshes with the turning bearing device 3 via a speed reduction mechanism 19A. Yes. The turning generator / motor 19 turns the upper turning body 4 on the lower traveling body 2 via the turning bearing device 3 by rotationally driving the gears by feeding power from a power storage device 30 of a power storage unit 22 to be described later. It is something to be made. On the other hand, the turning generator / motor 19 can store the regenerative energy generated when the turning operation is decelerated in the power storage device 30.

  Reference numeral 20 denotes a turning inverter electrically connected to the generator / motor 19 for controlling the generator / motor 19 for turning (see FIG. 7). The turning inverter 20 is configured by combining a plurality of switching elements (not shown) and the like. Thus, the turning inverter 20 converts the AC regenerative power generated by the turning power generation / motor 19 into DC power and supplies it to the power storage device 30 when the turning power generation / motor 19 is regenerated. On the other hand, when the turning generator / motor 19 is driven to turn, the DC power from the power storage device 30 is converted into AC driving power and supplied to the turning generator / motor 19.

  Reference numeral 21 denotes an assist inverter that is electrically connected to the generator / motor 11 in order to control the assist generator / motor 11. As with the turning inverter 20, the assist inverter 21 is configured by combining a plurality of switching elements (not shown). The assist inverter 21 converts AC generated power generated by the assist generator / motor 11 into DC power and supplies it to the power storage device 30 when the assist generator / motor 11 generates power. On the other hand, when the assist generator / motor 11 is driven, the DC power from the power storage device 30 is converted into AC drive power and supplied to the assist generator / motor 11.

  Next, the power storage unit 22, which is a characteristic part of the present invention, will be described by taking as an example the case where the power storage unit 22 is provided in the utility chamber 18.

  Reference numeral 22 denotes a power storage unit mounted on the upper swing body 4. The power storage unit 22 stores electric power for rotationally driving the assist generator / motor 11 and the turning generator / motor 19. The power storage unit 22 is disposed in the utility chamber 18 together with the air cleaner 9C of the engine 9 and the like, for example. The power storage unit 22 includes a cooling device 23 and a power storage device 30, which will be described later. The power storage device 30 is attached to the upper side of the cooling device 23 and is detachably attached.

  Reference numeral 23 denotes a cooling device that constitutes a mounting base of the power storage unit 22, and the cooling device 23 generates cooling air to be supplied to the power storage device 30. As shown in FIGS. 3 to 5, the cooling device 23 includes a cooling case 24, a power storage unit evaporator 25, a return duct 27, a supply duct 28, and a fan 29. In this case, the cooling device 23 can be provided with a simple configuration and at a low cost by using an outdoor unit of the air conditioner 13 provided for cooling the inside of the cab 7.

  Reference numeral 24 denotes a cooling case provided on the revolving frame 6, and the cooling case 24 accommodates the power storage unit evaporator 25, the fan 29, and the like. Further, the cooling case 24 is formed as a box body that is flat in the upward and downward directions so that a power storage device 30 described later can be stably placed on the upper side thereof. An example of the shape of the cooling case 24 will be described. The cooling case 24 includes a rectangular upper surface plate 24A extending in the lateral direction (horizontal direction), and a lower surface plate 24B facing the lower surface of the upper surface plate 24A with a gap. A rectangular frame-shaped container is formed by a square frame-shaped peripheral surface plate 24C surrounding the upper surface plate 24A and the lower surface plate 24B. The rectangular parallelepiped cooling case 24 is fixedly attached to the mounting plate 18A of the utility chamber 18 by legs 24D provided at the four corners.

  Upward fitting cylinders 24E and 24F are provided on both end sides in the length direction of the upper surface plate 24A so as to protrude upward. The two upward fitting cylinders 24E and 24F serve as insertion holes through which a return duct 27 and a supply duct 28 described later are inserted. Further, the upward fitting cylinders 24 </ b> E and 24 </ b> F can be positioned in the horizontal direction with respect to the cooling case 24 by fitting with downward fitting cylinders 31 </ b> E and 31 </ b> F of the electricity storage case 31 described later. Furthermore, each upward fitting cylinder 24E, 24F protrudes upward from the upper surface plate 24A, thereby making it difficult for external dust or the like to enter the cooling case 24.

  On the other hand, the lower surface plate 24B of the cooling case 24 is provided with a drain hole 24G located below the power storage unit evaporator 25. Therefore, even when dew condensation occurs on the evaporator 25 cooled by the refrigerant, water droplets dripped from the evaporator 25 can be discharged to the outside through the water drain hole 24G.

  Reference numeral 25 denotes a power storage unit evaporator provided in the cooling case 24, and the evaporator 25 cools the cooling air supplied to the power storage device 30. As shown in FIG. 8, the evaporator 25 is connected to each refrigerant pipe 13 </ b> F, 13 </ b> G via a bypass refrigerant pipe 25 </ b> A so as to be in parallel with the air conditioner evaporator 13 </ b> E provided in the air conditioner 13. Yes. Thereby, the evaporator 25 for electrical storage units can cool by taking the heat of the cooling air which passes by vaporizing a refrigerant | coolant in a channel | path. On the other hand, the evaporator 25 is disposed so as to be greatly inclined with respect to the flow direction of the cooling air. Thereby, the evaporator 25 can arrange | position a large thing with good cooling efficiency also in the cooling case 24 where the height dimension of the up and down direction was restricted.

  Further, an expansion valve 26 is provided on the upstream side of the power storage unit evaporator 25, which is located in the middle of the bypass refrigerant pipe 25 </ b> A and injects the liquefied refrigerant toward the evaporator 25 in the form of a mist.

  Reference numeral 27 denotes a return duct provided in the cooling case 24. The return duct 27 is for returning the cooling air heated by cooling the power storage device 30 to the power storage unit evaporator 25 and returning it to the cooling case 24. As shown in FIG. 5, one end of the return duct 27 is a return opening 27A extending upward through an insertion hole in an upward fitting cylinder 24E disposed on the upstream side of the cooling air. On the other hand, the other end of the return duct 27 is located in the cooling case 24 and opens laterally toward the evaporator 25. The return duct 27 has a return opening 27 </ b> A that fits into an insertion portion 37 </ b> B of an outflow duct 37 described later. For example, the other end side is attached to the lower side of the upper surface plate 24 </ b> A of the cooling case 24.

  A supply duct 28 is provided on the cooling case 24 on the opposite side of the return duct 27 with the power storage unit evaporator 25 interposed therebetween. The supply duct 28 supplies cooling air to the power storage device 30. One end of the supply duct 28 is located in the cooling case 24 and opens laterally toward the fan 29. On the other hand, the other end of the supply duct 28 is a supply opening 28A extending upward through an insertion hole in the upward fitting cylinder 24F arranged on the downstream side of the cooling air. The supply duct 28 has a supply opening 28 </ b> A that fits into an insertion portion 35 </ b> B of an inflow duct 35 to be described later. For example, one end side is attached to the lower side of the upper surface plate 24 </ b> A of the cooling case 24.

  A cooling air supply fan 29 is provided in the cooling case 24. The fan 29 blows the cooling air that has passed through the evaporator 25 and is cooled toward the supply duct 28. The fan 29 is configured, for example, as a sirocco fan (centrifugal fan) that blows air by centrifugal force by rotationally driving a cylindrical impeller 29A by an electric motor (not shown). One end is connected.

  The cooling device 23 configured in this manner cools the warm cooling air returned from the return duct 27 by the evaporator 25 by driving the fan 29 in a state where the refrigerant is circulated through the energy storage unit evaporator 25. The cooled cooling air can be supplied from the supply duct 28 to the power storage device 30 side.

  Reference numeral 30 denotes a power storage device provided separately from the cooling device 23, and the power storage device 30 is cooled by cooling air supplied from the cooling device 23. Here, the power storage device 30 is attached to the cooling device 23 so as to be stacked on the upper side, and is detachably attached. The power storage device 30 includes a power storage case 31, a power storage member 32, an inflow duct 35, and an outflow duct 37.

  A power storage case 31 is provided separately from the cooling case 24 so as to face the cooling case 24 of the cooling device 23. The power storage case 31 accommodates a plurality of power storage members 32 and the like, and is formed as a box body having substantially the same size as the cooling case 24 in plan view. Thereby, the electrical storage case 31 can be stably placed on the upper side of the cooling case 24. An example of the shape of the electricity storage case 31 will be described. The electricity storage case 31 includes a rectangular upper surface plate 31A extending in a lateral direction, a lower surface plate 31B facing the lower surface of the upper surface plate 31A with a gap, and the upper surface plate. It is formed as a rectangular parallelepiped container by a square frame-shaped peripheral surface plate 31C surrounding between 31A and the lower surface plate 31B. The rectangular parallelepiped storage case 31 is placed on the cooling case 24 by leg portions 31D provided at the four corners of the lower surface plate 31B, for example.

  Downward fitting cylinders 31E and 31F are provided at both ends in the length direction of the lower surface plate 31B so as to protrude downward and correspond to the upward fitting cylinders 24E and 24F of the cooling case 24, respectively. The two downward fitting cylinders 31E and 31F serve as insertion holes through which the ducts 27 and 28 are inserted. Further, the downward fitting cylinders 31E and 31F can be stably supported on the cooling case 24 by being externally fitted to the upward fitting cylinders 24E and 24F of the cooling case 24. , 28, 35, 37 can be reduced. Further, a control device 38 to be described later is attached to the upper side of the upper surface plate 31 </ b> A, and this control device 38 is attached to and detached from the cooling device 23 together with the power storage device 30.

  Reference numeral 32 denotes a plurality of, for example, two power storage members provided in the power storage case 31 for storing electric power. The power storage members 32 are arranged in two stages so as to overlap in the upward and downward directions. In this case, the power storage member 32 can be set to one stage or three or more stages (one or three or more) according to the required power. Thus, the power storage device 30 can cope with the problem by adjusting the height dimension of the power storage case 31 according to the number of stages of the power storage member 32. Each power storage member 32 includes a storage box 33 (described later) and a plurality of power storage units 34.

  Reference numeral 33 denotes a storage box that forms the outer shell of the power storage member 32. The storage box 33 is formed as a rectangular parallelepiped box that is elongated in the flow direction of the cooling air. Specifically, the storage box 33 is located on a rectangular upper surface portion 33A, a rectangular lower surface portion 33B facing the lower surface 33A below the upper surface portion 33A, and one side (upstream side) in the length direction. An upstream surface portion 33C provided across an edge of the upper surface portion 33A and an edge of the lower surface portion 33B, and an edge and a lower surface of the upper surface portion 33A at positions facing the upstream surface portion 33C in the length direction. A downstream surface portion 33D provided across the edge of the portion 33B, and side surface portions 33E and 33F arranged so as to sandwich the upper surface portion 33A and the lower surface portion 33B. Thereby, the inside of the storage box 33 is a storage space 33G for storing the power storage unit 34.

  Furthermore, as shown in FIGS. 4 and 6, the upstream surface portion 33 </ b> C of the storage box 33 is provided with a wide opening 33 </ b> H that is positioned near the lower side in the upper and lower directions and extends in a slit shape in the lateral direction. The wide opening 33H on the upstream side constitutes a connection port to which an outlet 35E of an inflow duct 35 described later is connected. On the other hand, on the lower side of the downstream surface portion 33D of the storage box 33, similarly to the wide opening 33H, a wide opening 33J extending in a slit shape in the lateral direction is provided, and the downstream wide opening 33J will be described later. A connection port to which the inlet 37E of the outlet duct 37 is connected is configured.

  Here, the slit-shaped wide opening 33H can circulate the cooling air flowing into the storage box 33 over a wide range in the storage space 33G, and the slit-shaped wide opening 33J expands after cooling each power storage unit 34. The cooled cooling air can be smoothly discharged to the outflow duct 37 side.

  The wide opening 33H is provided on the lower side of the upstream surface portion 33C, and the wide opening 33J is provided on the lower side of the downstream surface portion 33D. However, the shape, arrangement, etc. of the power storage unit 34 to be cooled are not limited. Depending on the conditions, the wide openings 33H and 33J can be provided at an intermediate position or an upper position in the upper and lower directions.

  Reference numeral 34 denotes a plurality of power storage units arranged side by side in the accommodation space 33G in the accommodation box 33. The plurality of power storage bodies 34 are called cells, and are composed of, for example, a lithium ion battery. Here, each power storage unit 34 is easily deteriorated at a high temperature and its life is shortened. Therefore, the power storage unit 34 is constantly cooled by cooling air supplied from the cooling device 23 in a high temperature environment.

  Reference numeral 35 denotes an inflow duct provided in the electricity storage case 31. The inflow duct 35 is connected to the supply duct 28 on the cooling device 23 side so that cooling air flows into the electricity storage member 32 (electric storage body 34). It is. As shown in FIG. 6, the inflow duct 35 includes a rectangular tube-shaped vertical tube 35 </ b> A that extends upward and downward, an insertion portion 35 </ b> B that extends from the lower portion of the vertical tube 35 </ b> A, and the vertical tube 35 </ b> A. And two horizontal cylinders 35C and 35D which are provided at the upper and lower intermediate parts and the upper part and which are bent from the vertical cylinder 35A and extend toward the power storage member 32.

  The insertion part 35B can be removably inserted into the supply opening 28A of the supply duct 28 from above. In this case, by attaching a seal member 36 such as an O-ring around the insertion portion 35B, it is possible to prevent the cooling air from leaking from the connection portion between the inflow duct 35 and the supply duct 28. Conversely, entry of dust and the like from the outside can also be prevented.

  On the other hand, the two horizontal cylinders 35 </ b> C and 35 </ b> D extend toward the storage box 33 of the power storage member 32 disposed above and below. Each of the horizontal cylinders 35C and 35D has a wide outlet 35E that extends in a slit shape in the horizontal direction at almost the same as the wide opening 33H of the storage box 33 at the tip end portion serving as a connection port. The outlet 35E of each horizontal cylinder 35C, 35D is fixed to the upstream surface portion 33C of the storage box 33 so as to correspond to the wide opening 33H of the storage box 33, as shown in FIGS. . As described above, in a state where the wide outlet 35E is connected to the wide opening 33H of the storage box 33, the cooling air is circulated in a wide range in the storage space 33G of the storage box 33 through the wide outlet 35E and the wide opening 33H. The plurality of power storage units 34 can be efficiently cooled.

  Reference numeral 37 denotes an outflow duct provided on the opposite side of the inflow duct 35 across the storage box 33 of the power storage member 32. The outflow duct 37 is connected to the return duct 27 on the cooling device 23 side, and causes the warmed cooling air after passing through the power storage member 32 (power storage unit 34) to flow out. Like the inflow duct 35 described above, the outflow duct 37 includes a vertical cylinder 37A, an insertion portion 37B, and two horizontal cylinders 37C and 37D. A seal member 36 is attached around the insertion portion 37B. Yes.

  Furthermore, the two horizontal cylinders 37C and 37D are wide inflow ports 37E in which the front end portions serving as connection ports extend in a slit shape in the horizontal direction. The inlet 37E of each horizontal cylinder 37C, 37D is fixed to the downstream surface portion 33D of the storage box 33 so as to correspond to the wide opening 33J of the storage box 33, as shown in FIG. In this way, in a state where the wide inlet 37E is connected to the wide opening 33J of the storage box 33, the cooling air that has spread by cooling each power storage unit 34 in the storage space 33G of the storage box 33 is expanded with the wide opening 33J. It is possible to smoothly flow out to the outflow duct 37 side by the inflow port 37E, and also in this respect, each power storage unit 34 can be efficiently cooled.

  Reference numeral 38 denotes a control device provided on the upper side of the power storage device 30. The control device 38 controls the current and voltage of each power storage member 32 of the power storage member 32. The control device 38 includes a box-shaped control case 38A attached on the upper surface plate 31A of the power storage case 31, and a control unit main body 38B provided in the control case 38A. The control device 38 is electrically connected to each power storage member 32 of the power storage device 30 and a main controller (not shown).

  Here, the power storage device 30 and the control device 38 are integrally assembled. When the power storage device 30 is replaced, the power storage device 30 and the control device 38 are attached or detached together. Will do.

  Reference numeral 39 denotes a control valve (see FIG. 7) provided on the revolving frame 6. The control valve 39 is formed by a plurality of hydraulic control valves that control the traveling motors 2E, 2F of the lower traveling body 2 and the cylinders 5D, 5E, 5F of the work device 5. The control valve 39 supplies the pressure oil supplied from the hydraulic pump 10 to the actuator corresponding to this operation according to the operation of the operation lever for work.

  Next, an operation when the power storage device 30 (the control device 38) is attached to and removed from the cooling device 23 and a flow of cooling air when the power storage device 30 is cooled by the cooling device 23 will be described.

  First, the attaching / detaching operation of the power storage device 30 with respect to the cooling device 23 will be described. In this case, the power storage device 30 to which the control device 38 is attached approaches the cooling device 23 installed in the utility chamber 18 from above, and the power storage device 30 flows into the return opening 27A of the return duct 27 of the cooling device 23. The insertion part 37B of the duct 37 is inserted and fitted. At the same time, the insertion portion 35B of the inflow duct 35 of the power storage device 30 is inserted and fitted into the supply opening 28A of the supply duct 28 of the cooling device 23. Further, the downward fitting cylinders 31E and 31F provided in the power storage case 31 are fitted into the upward fitting cylinders 24E and 24F provided in the cooling case 24. In this state, each leg 31 </ b> D of the electricity storage case 31 is placed on the upper surface plate 24 </ b> A of the cooling case 24.

  As a result, the power storage device 30 can be attached so as to overlap the upper side of the cooling device 23, and the cooling device 23 is fitted with the ducts 27 and 28 of the cooling device 23 and the ducts 37 and 35 of the power storage device 30. Cooling air can be circulated between the power storage device 30 and the power storage device 30. Further, by fitting the downward fitting cylinders 31 </ b> E and 31 </ b> F of the storage case 31 to the upward fitting cylinders 24 </ b> E and 24 </ b> F of the cooling case 24, the storage case 31 can be positioned in the horizontal direction with respect to the cooling case 24. it can.

  As described above, when the power storage device 30 is mounted on the upper side of the cooling device 23, the cooling device 23 and the power storage device 30 are integrated with each other by using a screw member, a connecting bracket, a binding tool or the like (all not shown). The controller 38 is connected to the controller via a connector (not shown).

  On the other hand, when a failure occurs in power storage device 30 or when power storage device 30 (power storage unit 34) reaches the end of life, control device 38 is disconnected from the controller, and power storage device 30 is connected to cooling device 23. Remove the screw member. In this state, the power storage device 30 (the control device 38) can be lifted and removed from the cooling device 23.

  Next, the flow of cooling air when the power storage device 30 is cooled by the cooling device 23 will be described.

  In this case, the refrigerant flowing through the refrigerant pipes 13F and 13G of the air conditioner 13 is supplied to the power storage unit evaporator 25 via the bypass refrigerant pipe 25A. In this state, by rotating and driving the impeller 29 </ b> A of the fan 29, the cooling air warmed by cooling each power storage member 32 of the power storage device 30 is returned into the cooling case 24 through the outflow duct 37 and the return duct 27. The warm cooling air is cooled by passing through the power storage unit evaporator 25 and is blown to the supply duct 28 side by the fan 29.

  The cooling air supplied to the supply duct 28 passes through the vertical cylinder 35 </ b> A of the inflow duct 35 and is supplied from the horizontal cylinders 35 </ b> C and 35 </ b> D into the storage box 33 of each power storage member 32. In this case, since the outlet 35E of each horizontal cylinder 35C, 35D and the wide opening 33H of each storage box 33 are formed wide, the cooling air is supplied in a wide range in the storage space 33G of the storage box 33. Can do. As a result, the cooling air supplied into the accommodation space 33G flows around each power storage unit (cell) 34 and cools each power storage unit 34.

  Then, the cooling air warmed by cooling each power storage unit 34 is discharged to the return duct 27 side through the outflow duct 37. Also in this case, since the wide opening 33J of each storage box 33 and the inflow port 37E of each horizontal cylinder 37C, 37D are formed wide, the cooling air spread over a wide area in the storage space 33G is smoothly supplied to the outflow duct 37 side. Can be drained into.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. Next, the operation of the hydraulic excavator 1 will be described.

  First, the operator gets on the cab 7 and sits on the driver's seat. In this state, by operating a travel operation lever (both not shown), pressure oil is supplied from the control valve 39 to the travel motors 2E and 2F of the lower travel body 2, and the left and right drive wheels 2B. To drive the hydraulic excavator 1 forward or backward. The operator seated in the driver's seat operates the operation lever (not shown) for operation to turn the upper swing body 4 by the swing bearing device 3 or to move the working device 5 up and down. Sediment excavation work can be performed.

  When the hydraulic excavator 1 is operated, the power stored in the power storage unit 22 is supplied to the assist generator / motor 11 and the turning generator / motor 19 so as to be driven to rotate.

  Here, depending on the working environment of the hydraulic excavator 1, the power storage unit 22 may be exposed to a high temperature. In such a case, the power storage device 30 may be deteriorated and the life may be shortened. However, the power storage device 30 can be easily replaced by being disconnected from the cooling device 23.

  Thus, according to the present embodiment, the power storage unit 22 includes the cooling device 23 that generates cooling air, and the power storage device that is provided separately from the cooling device 23 and is cooled by the cooling air supplied from the cooling device 23. 30, the power storage device 30 is attached to the cooling device 23 and is detachably attached.

  Therefore, even if water droplets due to condensation occur in the power storage unit evaporator 25 of the cooling device 23, the power storage device 30 is provided separately from the cooling device 23, so that the water droplets are prevented from flowing to the power storage device 30 side. can do. On the other hand, when the power storage device 30 is replaced, only the power storage device 30 can be removed with the cooling device 23 left on the revolving frame 6 side.

  As a result, the power storage device 30 can be protected from water droplets due to condensation, and the durability and life of the power storage device 30 can be improved. In addition, in the replacement work of the power storage device 30, the cooling device 23 can be left on the revolving frame 6, so that the work of disconnecting the refrigerant pipe, the work of extracting the refrigerant, etc. can be omitted, and the replacement work of the power storage device 30 is performed. Can be easily performed.

  The power storage device 30 of the power storage unit 22 is configured to be stacked on the upper side of the cooling device 23. Therefore, even if water droplets due to condensation are generated in the cooling device 23 located on the lower side, the water droplets can be prevented from flowing into the power storage device 30 located on the upper side. As a result, the life of each power storage member 32 provided in the power storage device 30 can be extended, and the power storage device 30 can be easily attached to and detached from the cooling device 23 simply by moving the power storage device 30 upward or downward. The workability at the time of replacement can be improved.

  The cooling case 24 constituting the cooling device 23 is provided with a pair of upward fitting cylinders 24E and 24F located on the upper surface plate 24A side, and the electricity storage case 31 constituting the electricity storage device 30 is provided on the lower surface plate 31B side. A pair of downward fitting cylinders 31E, 31F which are located at the positions and are fitted to the upward fitting cylinders 24E, 24F are provided. In addition, the power storage device 30 can attach and detach the downward fitting cylinders 31 </ b> E and 31 </ b> F to the upward fitting cylinders 24 </ b> E and 24 </ b> F of the cooling device 23. Thereby, the electrical storage case 31 can be positioned in the horizontal direction with respect to the cooling case 24.

  Further, a cooling air return duct 27 is opened upward in the upward fitting cylinder 24E of the cooling case 24, and a cooling air supply duct 28 is opened upward in the upward fitting cylinder 24F. On the other hand, an outlet duct 37 connected to the return duct 27 is opened downward in the downward fitting cylinder 31E of the electricity storage case 31, and an inlet duct 35 connected to the supply duct 28 in the downward fitting cylinder 31F. Is configured to open downward.

  Therefore, the cooled cooling air supplied from the cooling case 24 flows into the power storage case 31 through the supply duct 28 and the inflow duct 35, and the cooling air warmed in the power storage case 31 passes through the outflow duct 37 and the return duct 27. It can be returned to the cooling case 24. Thereby, the cooling air can be circulated and circulated between the cooling device 23 and the power storage device 30.

  On the other hand, the cooling device 23 for the power storage unit 22 includes a cooling case 24 attached to the revolving frame 6 (utility chamber 18), and a power storage unit evaporator 25 that is provided in the cooling case 24 and cools the cooling air by circulating a refrigerant. A return duct 27 that is provided in the cooling case 24 and cools the power storage device 30 and warms it toward the evaporator 25 and returns the cooling air to the inside of the cooling case 24, and is opposite to the return duct 27 with the evaporator 25 interposed therebetween. A supply duct 28 provided on the cooling case 24 for supplying cooling air to the power storage device 30 and a cooling air which is provided in the cooling case 24 and passed through the evaporator 25 are supplied. A fan 29 that blows air toward the duct 28 is used.

  The power storage device 30 of the power storage unit 22 is provided in the power storage case 31 for storing power, and a power storage case 31 provided separately from the cooling case 24 so as to face the cooling case 24 of the cooling device 23. A power storage member 32 that is cooled by cooling air from the cooling device 23, an inflow duct 35 that is provided in the power storage case 31 and is connected to the supply duct 28 to allow cooling air to flow toward the power storage member 32, and the power storage An outlet duct 37 that is provided on the electricity storage case 31 and is connected to the return duct 27 so as to flow out the cooling air after passing through the electricity storage member 32 is located on the opposite side of the inlet duct 35 with the member 32 interposed therebetween. It is composed.

  Therefore, the cooling device 23 of the power storage unit 22 cools the cooling air by the power storage unit evaporator 25 when the cooling air warmed by cooling the power storage device 30 is returned into the cooling case 24 through the return duct 27. The cooling air cooled by the evaporator 25 is blown to the supply duct 28 side by the fan 29 and can be supplied to the power storage device 30 side through the supply duct 28.

  On the other hand, when the cooling power is supplied from the cooling device 23 to the power storage device 30 of the power storage unit 22, the cooling air flows into the power storage case 31 through the inflow duct 35 connected to the supply duct 28. Cool 32. Then, the cooling air warmed by cooling each power storage member 32 can be discharged through the outflow duct 37 to the return duct 27 side connected to the outflow duct 37.

  Thus, in a state where the power storage device 30 is attached to the cooling device 23, each power storage member is circulated by the cooling air cooled by the power storage unit evaporator 25 by circulating the cooling air through the ducts 27, 28, 35, and 37. 32 can be constantly cooled. Further, by separating the supply duct 28, the return duct 27, the inflow duct 35, and the outflow duct 37, the power storage device 30 can be separated from the cooling device 23, and the cooling device 23 is left on the upper swing body 4 side. Only the power storage device can be replaced.

  In addition, each power storage member 32 provided in the power storage device 30 includes a storage box 33 in which the inflow duct 35 and the outflow duct 37 are connected at a position facing the storage space 33 </ b> G in the length direction, and in the storage box 33. It is comprised with the some electrical storage body 34 arrange | positioned along with the accommodation space 33G. In addition, the connection port between the storage box 33 and the inflow duct 35, that is, the wide opening 33H of the storage box 33 and the outlet 35E of the inflow duct 35 are formed as a wide opening extending in a slit shape. Similarly, the connection port between the storage box 33 and the outflow duct 37, that is, the wide opening 33J of the storage box 33 and the inflow port 37E of the outflow duct 37 are formed as wide openings extending in a slit shape.

  Accordingly, the cooling air flowing into the storage box 33 from the inflow duct 35 of the power storage device 30 is circulated in a wide range in the storage space 33G of the storage box 33 by the wide outlet 35E and the wide opening 33H located on the upstream side. It is possible to cool the plurality of power storage units 34 efficiently. On the other hand, the cooling air that has spread by cooling each power storage unit 34 in the accommodation space 33G of the accommodation box 33 can be smoothly discharged to the outflow duct 37 side by the wide wide opening 33J and the inflow port 37E located on the downstream side. In this respect, each power storage unit 34 can be efficiently cooled.

  A seal member 36 is provided at each of the connection part between the return duct 27 and the outflow duct 37 and the connection part between the supply duct 28 and the inflow duct 35. Thereby, leakage of cooling air can be prevented and the cooling efficiency of each power storage member 32 can be increased. In addition, entry of dust from the outside can be prevented.

  Further, the upper fitting plates 24E and 24F are provided on the upper surface plate 24A of the cooling case 24 so as to protrude upward, and the lower fitting plate 24B of the power storage case 31 is fitted with the upward fitting tubes 24E and 24F. The downward fitting cylinders 31E and 31F are provided. Therefore, when the power storage device 30 is attached to the cooling device 23, the downward fitting cylinders 31 </ b> E and 31 </ b> F of the power storage case 31 are fitted into the upward fitting cylinders 24 </ b> E and 24 </ b> F of the cooling case 24, thereby Thus, the storage case 31 can be positioned in the horizontal direction. Further, each of the upward fitting cylinders 24E and 24F protrudes upward from the upper surface plate 24A, so that external dust or the like can hardly enter the cooling case 24.

  In the embodiment, a case where the control device 38 is mounted on the upper side of the power storage device 30 is illustrated. However, the present invention is not limited to this. For example, the control device 38 may be built in the power storage case 31 of the power storage device 30.

  In the embodiment, the hybrid hydraulic excavator 1 including the engine 9 and the assist generator / motor 11 has been described as an example. However, the present invention is not limited to this, and may be configured to be applied to, for example, an electric hydraulic excavator that abolishes the prime mover and drives the hydraulic pump only by the electric motor.

1 Excavator (construction machine)
2 Lower traveling body (car body)
4 Upper swing body (car body)
6 Revolving frame 22 Power storage unit 23 Cooling device 24 Cooling case 24E, 24F Upward fitting cylinder 25 Storage unit evaporator 27 Return duct 28 Supply duct 29 Fan 30 Power storage device 31 Storage case 31E, 31F Downward fitting cylinder 32 Power storage member 33 Box 33G Storage space 33H, 33J Wide opening (connection port)
34 Power storage unit 35 Inflow duct 35E Outlet (connection port)
37 Outflow duct 37E Inlet (connection port)

Claims (6)

In a construction machine comprising a self-propelled vehicle body, a generator / motor mounted on the vehicle body, and a power storage unit mounted on the vehicle body and storing electric power for driving the generator / motor,
The power storage unit includes a cooling device that generates cooling air, and a power storage device that is provided separately from the cooling device and is cooled by cooling air supplied from the cooling device,
The construction machine, wherein the power storage device is attached to the cooling device and is detachably attached.   The construction machine according to claim 1, wherein the power storage device of the power storage unit is configured to be stacked on the upper side of the cooling device. The cooling case constituting the cooling device is provided with a pair of upward fitting cylinders located on the upper surface side thereof,
The power storage case that constitutes the power storage device is provided with a pair of downward fitting cylinders that are positioned on the lower surface side thereof and are fitted with the upward fitting cylinders,
The construction machine according to claim 1 or 2, wherein the power storage device is configured such that the downward fitting cylinder is attached to the upward fitting cylinder of the cooling device and is detachably fitted. Of the pair of upward fitting cylinders of the cooling case, one upward fitting cylinder has a cooling air return duct opened upward, and the other upward fitting cylinder has a cooling air supply duct facing upward. Open
Of the pair of downward fitting cylinders of the electricity storage case, one downward fitting cylinder has an outlet duct connected to the return duct opened downward, and the other downward fitting cylinder has the supply duct. The construction machine according to claim 3, wherein the inflow duct to be connected is opened downward. The cooling device of the power storage unit includes a cooling case attached to the vehicle body side, an evaporator provided in the cooling case to cool the cooling air by circulating a refrigerant, and the power storage device provided in the cooling case. A return duct that returns the cooled and heated cooling air to the evaporator and returns to the evaporator, and a cooling air that is provided on the opposite side of the return duct across the evaporator and that is provided in the cooling case. A supply duct to be supplied, and a fan that is provided in the cooling case and blows cooling air that has passed through the evaporator and is cooled toward the supply duct,
The power storage device of the power storage unit is provided with a power storage case provided separately from the cooling case so as to face the cooling case of the cooling device, and is cooled by the cooling air provided in the power storage case to store electric power. An electricity storage member that is connected to the supply duct provided in the electricity storage case and allows cooling air to flow into the electricity storage member, and is located on the opposite side of the inflow duct across the electricity storage member The construction machine according to claim 1, further comprising an outflow duct that is provided in a storage case and is connected to the return duct to allow cooling air to flow out after passing through the storage member. The power storage member of the power storage device includes a storage box in which the inflow duct and the outflow duct are connected to a position facing the storage space in the length direction, and a plurality of the storage members arranged side by side in the storage space in the storage box. Consists of a power storage unit,
The construction machine according to claim 5, wherein the connection port between the storage box and the inflow duct and the connection port between the storage box and the outflow duct are formed as wide openings extending in a slit shape.

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