Construction machinery

Abstract

To provide a construction machine that ensures weight balance even when an engine, a post-processing device, an inverter and converter are all mounted, and reduces the effect of heat on the inverter and converter in the engine.SOLUTION: A construction machine is provided with an engine cover installed on a vehicle body frame from above vertically on the rear side of a traveling vehicle body with respect to a turning axis of a revolving body, and an engine arranged in an engine room inside the engine cover. A post-processing device is arranged side by side with respect to the engine on one side in the width direction of the traveling vehicle body. An inverter and a converter are installed on the vehicle body frame from above vertically outside the engine room and on the side opposite to the side where the post-processing device is located with respect to the engine in the width direction of the traveling vehicle body. The inverter performs power conversion between DC power and AC power, and the converter performs voltage conversion of the DC power.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a construction machine. [Background technology]

[0002] Patent Document 1 discloses a crane as a construction machine that includes a traveling body and a rotating body connected to the traveling body from above in the vertical direction. In this crane, the rotating body can rotate relative to the traveling body around a vertical rotation axis. The crane is also equipped with an engine, and power generated by starting the engine is used to perform the traveling motion of the traveling body, the rotating motion of the rotating body, and the raising and lowering motion of the boom. In addition, in the crane, DC power from a battery, which serves as a power source, is converted to AC power by an inverter, and the converted AC power is supplied to a motor (electric motor), which generates power. In the crane, the power generated by the motor is also used to perform the traveling motion of the traveling body, etc. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-289983 Summary of the Invention [Problem to be solved by the invention]

[0004] Construction machinery equipped with an engine, such as that described in Patent Document 1, may be equipped with an aftertreatment device that after-treats exhaust gas from the engine and releases it into the atmosphere. Construction machinery may also be equipped with electrical components that operate at a voltage different from that of the battery. In this case, it becomes necessary to equip the construction machinery with a converter (DC / DC converter) that converts the voltage of direct current power. The engine, aftertreatment device, inverter, and converter each have a certain weight. For this reason, construction machinery equipped with all of the engine, aftertreatment device, inverter, and converter is required to ensure a weight balance in the traveling vehicle body, etc. Furthermore, it is required to reduce the impact of heat generated by the engine on the inverter and converter.

[0005] The present invention has been made to solve the above-mentioned problems, and its object is to provide a construction machine in which weight balance is ensured even when an engine, aftertreatment device, inverter, and converter are all installed, and in which the effect of heat from the engine on the inverter and converter is reduced. [Means for solving the problem]

[0006] In order to achieve the above object, a construction machine according to one aspect of the present invention comprises a traveling vehicle body having a body frame, a rotating body connected to the body frame of the traveling vehicle body from above in the vertical direction and rotatable relative to the traveling vehicle body around a rotating shaft along the vertical direction, an engine cover installed on the body frame from above in the vertical direction on the rear side of the traveling vehicle body with respect to the rotating shaft of the rotating body and forming an engine room inside, an engine arranged in the engine room and generating power when started, and a power generating mechanism arranged on one side of the traveling vehicle body in the width direction, the power generating mechanism being arranged in parallel with the engine ... The vehicle comprises an aftertreatment device that after-treats exhaust gas from an engine and releases it into the atmosphere; an inverter that is installed on the body frame from the vertically upper side outside the engine compartment and on the opposite side of the width direction of the traveling vehicle body from the side on which the aftertreatment device is located relative to the engine, and that converts power between DC power and AC power; and a converter that is installed on the body frame from the vertically upper side outside the engine compartment and on the opposite side of the width direction of the traveling vehicle body from the side on which the aftertreatment device is located relative to the engine, and that converts the DC power into voltage. [Effects of the Invention]

[0007] According to the present invention, a construction machine can be provided in which weight balance is ensured even when an engine, aftertreatment device, inverter, and converter are all installed, and the effect of heat from the engine on the inverter and converter is reduced. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a side view showing a crane, which is an example of a construction machine according to an embodiment, with the traveling vehicle body viewed from one side in the width direction. [Figure 2] FIG. 2 is a rear view of a crane, which is an example of a construction machine according to the embodiment, with the traveling vehicle body viewed from the rear side. [Figure 3] FIG. 3 is a perspective view showing a traveling vehicle body of the crane according to the embodiment. [Figure 4]FIG. 4 is a perspective view showing the traveling body of the crane according to the embodiment with the engine cover and the cover member removed. [Figure 5] FIG. 5 is a perspective view showing the internal configuration of an engine room and an accommodating cavity in the traveling body of the crane according to the embodiment. [Figure 6] FIG. 6 is a top view showing the internal configuration of the accommodation cavity in the traveling body of the crane according to the embodiment, as viewed from vertically above. [Figure 7] FIG. 7 is a side view showing the internal configuration of the accommodation cavity in the traveling vehicle body of the crane according to the embodiment, as viewed from the outside in the width direction of the traveling vehicle body. [Figure 8] FIG. 8 is a side view showing the internal configuration of the accommodation cavity in the traveling body of the crane according to the embodiment, with the radiator and oil cooler removed, as viewed from the outside in the width direction of the traveling body. [Figure 9] FIG. 9 is a side view showing the internal configuration of the accommodation cavity in the traveling body of the crane according to the embodiment, with the radiator, oil cooler, and fan removed, as viewed from the outside in the width direction of the traveling body. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments will be described with reference to the drawings.

[0010] 1 and 2 show a crane 1 as an example of a construction machine according to an embodiment. As shown in FIGS. 1 and 2, the crane 1 includes a traveling body 2 and a rotating body 3. The traveling body 2 has a front-to-rear direction (direction indicated by arrows X1 and X2) that intersects (is perpendicular or substantially perpendicular to) the vertical direction (direction indicated by arrows Z1 and Z2), and a width direction (direction indicated by arrows W1 and W2) that intersects (is perpendicular or substantially perpendicular to) both the vertical direction and the front-to-rear direction. In FIG. 1, the traveling body 2 is shown as viewed from one side in the width direction, i.e., the right side (arrow W1 side), and in FIG. 2, the traveling body 2 is shown as viewed from the rear side (arrow X2 side).

[0011] The traveling vehicle body 2 includes a vehicle body frame 5. The vehicle body frame 5 includes a frame upper surface 6 facing vertically upward. The rotating unit 3 is connected to the vehicle body frame 5 from the vertical upper side and is installed on the frame upper surface 6. The rotating unit 3 is capable of rotating relative to the traveling vehicle body 2 around a rotation axis P along the vertical direction. The rotating unit 3 also defines a fore-aft direction that intersects the vertical direction (perpendicular or approximately perpendicular) and a width direction that intersects both the vertical direction and the fore-aft direction (perpendicular or approximately perpendicular). FIGS. 1 and 2 show a state in which the fore-aft direction of the traveling vehicle body 2 coincides or approximately coincides with the fore-aft direction of the rotating unit 3, and the width direction of the traveling vehicle body 2 coincides or approximately coincides with the width direction of the rotating unit 3. Also, FIGS. 1 and 2 show the crane 1 in a state in which the front side of the traveling vehicle body 2 (the side indicated by the arrow X1) coincides or approximately coincides with the front side of the rotating unit 3.

[0012] The rotating structure 3 is equipped with a cab (operator's compartment) 7. In the cab 7, an operator operates the crane 1, etc. The operation of the crane 1 includes operations related to the travel of the crane 1 and operations for work using the crane 1, etc. The rear end of a boom 8 is connected to the rotating structure 3. The boom 8 extends in the longitudinal direction from the rear end to the front end. The boom 8 extends from the connection position to the rotating structure 3 toward the front side of the rotating structure 3. The boom 8 can be raised and lowered relative to the rotating structure 3. The boom 8 can also be rotated together with the rotating structure 3 relative to the traveling vehicle body 2. In this embodiment, the boom 8 can be extended and retracted in the longitudinal direction. In the rotating structure 3, the cab 7 is located on one side of the boom 8 in the width direction. In the example shown in Figures 1 and 2, the cab 7 is located on the right side of the rotating structure 3 with respect to the boom 8.

[0013] 3 and 4 show the traveling vehicle body 2. As shown in FIGS. 1, 3, 4, etc., the traveling vehicle body 2 includes a front axle 11A and a rear axle 11B. The front axle 11A and the rear axle 11B are disposed vertically below the body frame 5 and extend along the width direction of the traveling vehicle body 2. The front axle 11A and the rear axle 11B are disposed apart from each other in the front-to-rear direction of the traveling vehicle body 2, with the front axle 11A disposed at a front position and the rear axle 11B disposed at a rear position of the traveling vehicle body 2. A pivot axis P of the rotating unit 3 passes between the front axle 11A and the rear axle 11B in the front-to-rear direction of the traveling vehicle body 2. The front axle 11A includes a pair of front wheels 12A, and the rear axle 11B includes a pair of rear wheels 12B. On the front axle 11A, one of the front wheels 12A is provided at each of both ends in the width direction of the traveling body 2, and on the rear axle 11B, one of the rear wheels 12B is provided at each of both ends in the width direction of the traveling body 2.

[0014] The traveling body 2 also includes a pair of front outriggers 13A and a pair of rear outriggers 13B. In the traveling body 2, each of the front outriggers 13A is disposed forward of the front axle 11A, and each of the rear outriggers 13B is disposed rearward of the rear axle 11B. Therefore, in the traveling body 2, the pair of front outriggers 13A is disposed forward of the rotation axis P, and the pair of rear outriggers 13B is disposed rearward of the rotation axis P. When the crane 1 is operating, each of the front outriggers 13A and the rear outriggers 13B is extended outward in the width direction of the traveling body 2 and is in contact with the ground.

[0015] As shown in Figures 1 to 3, etc., in the traveling vehicle body 2, the engine cover 15 and the cover member 16 are installed vertically from above on the body frame 5. The engine cover 15 and the cover member 16 are arranged on the frame upper surface 6 of the body frame 5, rearward of the traveling vehicle body 2 with respect to the pivot axis P. Furthermore, on the frame upper surface 6 of the body frame 5, the cover member 16 is arranged adjacent to the engine cover 15 on one side in the width direction of the traveling vehicle body 2. In the example shown in Figures 1 to 3, etc., the cover member 16 is arranged adjacent to the engine cover 15 on the right side of the traveling vehicle body 2. An engine room 17 is formed inside the engine cover 15, and an accommodation cavity 18 is formed inside the cover member 16. Note that Figure 4 shows a state in which the engine cover 15 and the cover member 16 have been removed, and shows the internal configuration of the engine room 17 and the accommodation cavity 18.

[0016] The engine cover 15 covers the engine room 17 from each of the vertically upper side, the front side of the traveling body 2, the rear side of the traveling body 2, and the side opposite to the side where the storage cavity 18 is located in the width direction of the traveling body 2. The cover member 16 covers the storage cavity 18 from each of the vertically upper side, the front side of the traveling body 2, the rear side of the traveling body 2, and the side opposite to the side where the engine room 17 is located in the width direction of the traveling body 2. The body frame 5 is adjacent to the engine room 17 and the storage cavity 18 from the vertically lower side, and covers the engine room 17 and the storage cavity 18 from the vertically lower side.

[0017] Furthermore, the engine room 17 and the storage cavity 18 are separated in the width direction of the traveling vehicle body 2 by at least one of the engine cover 15 and the cover member 16. Therefore, at least one of the engine cover 15 and the cover member 16 covers the engine room 17 from the side where the storage cavity 18 is located in the width direction of the traveling vehicle body 2 (the right side of the traveling vehicle body 2). Since at least one of the engine cover 15 and the cover member 16 separates the engine room 17 and the storage cavity 18, the cover member 16 is installed on the body frame 5 outside the engine room 17, and the storage cavity 18 is formed outside the engine room 17.

[0018] FIG. 5 shows the internal configuration of the engine compartment 17 and the internal configuration of the accommodation cavity 18. FIG. 5 shows an enlarged view of the rear portion of the traveling vehicle body 2 shown in FIG. 4. As shown in FIGS. 4 and 5, etc., an engine 21 is disposed in the engine compartment 17. The engine 21 is mounted vertically above the body frame 5 inside the engine compartment 17. The engine 21 is located on the rear side of the traveling vehicle body 2 with respect to the pivot axis P. An aftertreatment device 22 is also mounted vertically above the body frame 5. The aftertreatment device 22 is disposed adjacent to the engine 21 on one side in the width direction of the traveling vehicle body 2. In the example shown in FIGS. 4 and 5, etc., the aftertreatment device 22 is disposed adjacent to the engine 21 on the left side (the side of the arrow W2) of the traveling vehicle body 2. The engine 21 and the aftertreatment device 22 are connected via an exhaust pipe 23. An imaginary central plane of the traveling vehicle body 2 in the width direction passes through the engine 21. 3 to 5, the engine 21 and the after-treatment device 22 are separated by an engine cover 15 or the like, and the after-treatment device 22 is disposed outside the engine compartment 17. However, in one example, the after-treatment device 22 may be disposed inside the engine compartment 17.

[0019] Furthermore, a torque converter 25, which is a fluid coupling, is installed in front of the engine 21 in the traveling vehicle body 2. The torque converter 25 is arranged on the rear side of the traveling vehicle body 2 with respect to the pivot axis P. The engine 21, which is a prime mover, generates power when started. The power generated by the engine 21 is transmitted to the torque converter 25. The torque converter 25 transmits the power from the engine 21 to a transmission (not shown) using oil or the like. The power transmitted to the transmission is then transmitted to at least one of the front axle 11A and the rear axle 11B. When the power from the engine 21 is transmitted to the front axle 11A and / or the rear axle 11B, the front wheels 12A and / or the rear wheels 12B rotate. This causes the traveling vehicle body 2 (crane 1) to perform a traveling operation.

[0020] The torque converter 25 can also be switched to a state in which power from the engine 21 is not transmitted to the transmission. When power from the engine 21 is not transmitted to the transmission, the traveling vehicle body 2 stops without traveling even if the engine 21 is running. The power generated by the engine 21 can also be transmitted to a hydraulic pump (not shown) via the torque converter 25. The hydraulic pump is operated by the power transmitted from the engine 21, which allows hydraulic oil to be supplied to a hydraulic motor and a hydraulic cylinder (neither of which are shown) provided in the crane 1, thereby enabling the hydraulic motor and the hydraulic cylinder to be operated. For example, the operation of a swing motor (not shown), which is one of the hydraulic motors, causes the swing body 3 to perform a swing operation, and the operation of a boom hoisting cylinder (not shown), which is one of the hydraulic cylinders, causes the boom 8 to perform a hoisting operation.

[0021] The engine 21 also generates exhaust gas. The exhaust gas generated by the engine 21 is discharged to the aftertreatment device 22 through the inside of the exhaust pipe 23. The aftertreatment device 22 performs aftertreatment, such as detoxifying the exhaust gas from the engine 21. The aftertreatment device 22 performs treatment on nitrogen oxides, particulate matter, and the like contained in the exhaust gas. For example, the aftertreatment device 22 reacts nitrogen oxides (NOx) contained in the exhaust gas with urea water to generate nitrogen and water, thereby removing the nitrogen oxides from the exhaust gas. The aftertreatment device also traps particulate matter (PM) contained in the exhaust gas using a diesel particulate filter (DPF), removing the particulate matter from the exhaust gas. The exhaust gas is after-treated by the aftertreatment device 22 and then discharged into the atmosphere. At this time, the after-treated exhaust gas is discharged outside the engine compartment 17.

[0022] Furthermore, in the traveling vehicle body 2, a motor generator 26 is installed between the engine 21 and the torque converter 25 in the longitudinal direction. The motor generator 26 generates power when supplied with AC power. For this reason, the crane 1 is provided with two power sources: the engine 21 and the motor generator 26. The motor generator 26 is connected to the engine 21 via a clutch (not shown). The clutch is switched between a state in which power can be transmitted between the engine 21 and the motor generator 26 and a state in which power cannot be transmitted between the engine 21 and the motor generator 26.

[0023] The torque converter 25 can transmit power generated by the motor generator 26 to at least one of the front axle 11A and the rear axle 11B via a transmission (not shown). When the power from the motor generator 26 is transmitted to the front axle 11A and / or the rear axle 11B, the front wheels 12A and / or the rear wheels 12B rotate, causing the traveling body 2 (crane 1) to perform a traveling operation. Therefore, the traveling body 2 can travel using the power generated by the engine 21, and can also travel using the power generated by the motor generator 26.

[0024] Furthermore, when the traveling vehicle body 2 is decelerating while traveling, kinetic energy due to traveling, including driving force for rotating the front wheels 12A and the rear wheels 12B, is transmitted to the motor generator 26. The motor generator 26 generates AC power by converting the kinetic energy due to traveling into electrical energy. Therefore, the motor generator 26 can generate regenerative energy (regenerative power).

[0025] Furthermore, when the engine 21 is stopped, the engine 21 is started by power transmitted from the motor generator 26. Therefore, the motor generator 26 functions as a starter for the engine 21. The motor generator 26 also converts the power transmitted from the engine 21 into AC power. Therefore, the motor generator 26 also functions as an alternator. Furthermore, in a state where power cannot be transmitted between the engine 21 and the motor generator 26, the power generated by the motor generator 26 can be transmitted to the aforementioned hydraulic pump via the torque converter 25. Even when the hydraulic pump is operated by power transmitted from the motor generator 26, it becomes possible to supply hydraulic oil to the hydraulic motor and the hydraulic cylinder, as described above, and to operate the hydraulic motor and the hydraulic cylinder.

[0026] Furthermore, in the traveling vehicle body 2, a cooling unit 27 is disposed in the engine compartment 17. The cooling unit 27 is located on the rear side of the traveling vehicle body 2 with respect to the engine 21. The cooling unit 27 is integrally provided with a radiator (not shown) that cools the engine 21, an intercooler that cools the air, an oil cooler that cools the hydraulic oil, and the like. As shown in Figures 4 and 5, etc., an inverter 31, a converter 32, a radiator 33, and an oil cooler 35 are disposed in the accommodation cavity 18 inside the cover member 16. The inverter 31, the converter 32, the radiator 33, and the oil cooler 35 are each installed on the vehicle body frame 5 from above, outside the engine compartment 17.

[0027] On the frame upper surface 6 of the body frame 5, the inverter 31, the converter 32, the radiator 33, and the oil cooler 35 are disposed on the rear side of the traveling vehicle body 2 with respect to the pivot axis P. Furthermore, the inverter 31, the converter 32, the radiator 33, and the oil cooler 35 are disposed on the opposite side of the engine 21 from the side on which the aftertreatment device 22 is disposed in the width direction of the traveling vehicle body 2. In one example shown in FIGS. 4 and 5 , the inverter 31, the converter 32, the radiator 33, and the oil cooler 35 are disposed on the right side of the traveling vehicle body 2 with respect to the engine 21. Furthermore, the inverter 31, the converter 32, the radiator 33, and the oil cooler 35 are disposed on the outer side with respect to the engine 21 in the width direction of the traveling vehicle body 2.

[0028] 6 to 9 show the configuration of the accommodation cavity 18 inside the cover member 16. FIG. 6 shows a state as viewed from above vertically, and FIGS. 7 to 9 show a state as viewed from the outside in the width direction of the traveling body 2. FIG. 8 shows a state in which the radiator 33 and the oil cooler 35 have been removed, and FIG. 9 shows a state in which the radiator 33, the oil cooler 35, and a fan 48 (described later) have been removed. As shown in FIGS. 4 to 9, etc., a cable 37 is connected to the converter 32 disposed in the accommodation cavity 18. As shown in FIG. 4, etc., a battery pack 36 is installed as a power source on one side of the traveling body 2 in the width direction. In the example shown in FIG. 4, etc., the battery pack 36 is installed on the right side of the traveling body 2 and is located between the front axle 11A and the rear axle 11B in the longitudinal direction of the traveling body 2. The battery pack 36 is electrically connected to the converter 32 via the cable 37.

[0029] 4 to 9, a cable 38 is connected to the inverter 31. The cable 38 is also connected to the motor generator 26. Therefore, the inverter 31 is electrically connected to the motor generator 26 via the cable 38. The inverter 31 is also electrically connected to the converter 32 via a cable 51. The inverter 31 converts power between DC power and AC power. The converter 32 converts the voltage of the DC power.

[0030] The battery pack 36 outputs DC power of a voltage (first voltage) V1 via a cable 37. The DC power output from the battery pack 36 is supplied to the converter 32. The DC power from the battery pack 36 is also supplied to the inverter 31 via cables 37 and 51. The DC power supplied from the battery pack 36 to the inverter 31 is not voltage converted in the converter 32, and the DC power of the voltage V1 is supplied to the inverter 31. The inverter 31 converts the DC power of the voltage V1 into AC power and supplies the converted AC power to the motor generator 26 via a cable 38. The motor generator 26 generates power by receiving AC power from the inverter 31.

[0031] Furthermore, motor generator 26 supplies the AC power generated as described above to inverter 31 via cable 38. Inverter 31 converts the AC power from motor generator 26 into DC power of voltage V1. Then, inverter 31 supplies the converted DC power to battery pack 36 via cables 37 and 51 to charge battery pack 36. The DC power supplied from inverter 31 to battery pack 36 is not voltage-converted in converter 32, and DC power of voltage V1 is supplied to battery pack 36. Furthermore, inverter 31 supplies the DC power converted from the AC power to converter 32 via cable 51.

[0032] The converter 32 performs voltage conversion on the DC power from the battery pack 36 and the DC power converted from the AC power by the inverter 31. In one example shown in FIGS. 4 to 9 , the converter 32 converts the DC power of voltage V1 into DC power of voltage V2 (second voltage) lower than voltage V1 by stepping it down. The converter 32 then outputs the DC power converted to voltage V2 via a cable (not shown). Here, for example, voltage V1 is 288 V and voltage V2 is 24 V.

[0033] The crane 1 is provided with electrical components operated by DC power of voltage V2. The electrical components operated by DC power of voltage V2 include controllers such as an engine controller, a hybrid controller, and a vehicle controller, as well as solenoids, relay circuits, and lighting fixtures. A pump (electric pump) 46 is also disposed in the accommodation cavity 18, and the pump 46 is also operated by DC power of voltage V2. The DC power of voltage V2 converted by the converter 32 is output to the aforementioned electrical components, including the pump 46, via a cable (not shown). Since the pump 46 is disposed in the accommodation cavity 18, it is installed vertically above the body frame 5, outside the engine compartment 17, and on the opposite side of the engine 21 in the width direction of the traveling body 2 from the side where the aftertreatment device 22 is located. The pump 46 is disposed on the rear side of the traveling body 2 with respect to the rotation axis P.

[0034] A battery 41 is also installed in the traveling vehicle body 2. The battery 41 is arranged on the opposite side of the engine 21 from the side on which the aftertreatment device 22 is located in the width direction of the traveling vehicle body 2. The battery 41 is also arranged adjacent to the cover member 16 from the rear side of the traveling vehicle body 2. The battery 41 is capable of outputting DC power of a voltage V2. In the traveling vehicle body 2, a storage case 55 is attached to the body frame 5 from the vertically lower side, and a relay circuit (not shown) is housed inside the storage case 55. The storage case 55 is adjacent to the storage cavity 18 from the vertically lower side, and the body frame 5 is interposed between the storage case 55 and the storage cavity 18.

[0035] Converter 32 can supply DC power of voltage V2 to battery 41 via a relay circuit inside housing case 55. Battery 41 is charged by the DC power of voltage V2 supplied from converter 32. Furthermore, when engine 21 and motor generator 26 are not in operation, battery 41 can supply DC power of voltage V2 to the aforementioned electrical components via a relay circuit inside housing case 55. Therefore, the aforementioned electrical components are also operated by DC power of voltage V2 from battery 41.

[0036] Furthermore, in the accommodation cavity 18, the radiator 33 and the oil cooler 35 are positioned outward in the width direction of the traveling vehicle body 2 relative to the inverter 31, the converter 32, and the pump 46. Therefore, the radiator 33 and the oil cooler 35 are positioned farther from the engine 21 than the inverter 31 and the converter 32. The radiator 33 and the oil cooler 35 are attached together to a single frame 45, and are installed on the vehicle frame 5 via the frame 45. Furthermore, in the accommodation cavity 18, a fan (electric fan) 48 is installed between the frame 45 and the pump 46 in the width direction of the traveling vehicle body 2. The fan 48 is adjacent to the radiator 33 and the oil cooler 35 from the inside in the width direction of the traveling vehicle body 2.

[0037] In addition, in the accommodation cavity 18, a tank 47 is installed on the inner side of the pump 46 in the width direction of the traveling vehicle body 2. The tank 47 is connected to the radiator 33 via a tube 43 and to the inverter 31 via a tube 53. The tank 47 stores water (cooling water) as a refrigerant. When the pump 46 is driven by a supply of DC power at voltage V2, the water stored in the tank 47 circulates through the inverter 31, the converter 32, the radiator 33, the pump 46, and the tank 47. A portion of the circulation path of the water as a refrigerant is formed by the tubes 43, 53, etc. When the temperature of the water circulating through the inverter 31, the converter 32, and the radiator 33 rises to a certain level, the fan 48 is driven. When the fan 48 is driven, a flow of air is generated that flows from outside the accommodation cavity 18 through the radiator 33 and the oil cooler 35 and into the fan 48. At this time, air flows into the fan 48 from the outside in the width direction of the traveling vehicle body 2, passing through the radiator 33 and the oil cooler 35. As a result, the water is cooled in the radiator 33 by the air flow from the radiator 33 and the oil cooler 35 toward the fan 48. Then, the cooled water (refrigerant) is circulated through the inverter 31 and the converter 32, thereby cooling the inverter 31 and the converter 32.

[0038] Further, tubes 42 are connected to the oil cooler 35. In the traveling vehicle body 2, oil serving as a refrigerant circulates through the oil cooler 35 and the motor generator 26. A portion of the circulation path of the oil serving as a refrigerant is formed by the tubes 42 and the like. When the fan 48 is driven as described above, a flow of air is generated that flows from the outside of the accommodation cavity 18 through the radiator 33 and the oil cooler 35 and into the fan 48. As a result, the oil is cooled in the oil cooler 35 by the air flow from the radiator 33 and the oil cooler 35 toward the fan 48. The cooled oil (refrigerant) is then circulated through the motor generator 26, thereby cooling the motor generator 26.

[0039] As described above, in this embodiment, the aftertreatment device 22 is disposed next to the engine 21 on one side in the width direction of the traveling vehicle body 2. The inverter 31 and the converter 32 are installed on the vehicle body frame 5 from above, outside the engine compartment 17, on the opposite side of the traveling vehicle body 2 width direction from the side on which the aftertreatment device 22 is located relative to the engine 21. Here, the weight of each of the engine 21, the aftertreatment device 22, the inverter 31, and the converter 32 is relatively large. In this embodiment, because the engine 21, the aftertreatment device 22, the inverter 31, and the converter 32 are disposed as described above, the weight balance of the traveling vehicle body 2 is appropriately ensured, and the weight balance of the crane 1 is also appropriately ensured. In particular, in this embodiment, the imaginary center plane of the traveling vehicle body 2 in the width direction passes through the engine 21. Therefore, the weight balance, particularly in the width direction of the traveling vehicle body 2, is appropriately ensured.

[0040] Furthermore, in this embodiment, the inverter 31 and the converter 32 are disposed outside the engine compartment 17. This reduces the effect of heat generated by the engine 21 on the inverter 31 and the converter 32. That is, excessive temperature increases in the inverter 31 and the converter 32 due to heat from the engine 21 are effectively suppressed. This prevents the radiator 33 and other mechanisms for cooling the inverter 31 and the converter 32 from becoming larger. This reduces the power consumption of the fan 48 that cools the water serving as a coolant in the radiator 33 and the pump 46 that circulates the water serving as a coolant. Furthermore, because the inverter 31 and the converter 32 are disposed outside the engine compartment 17, this prevents the engine cover 15, which defines the engine compartment 17 within, from becoming larger. This prevents the engine cover 15 from becoming larger, effectively preventing the revolving unit 3 from interfering with the engine cover 15.

[0041] The inverter 31 and the converter 32 are installed vertically from above on the body frame 5 and housed in the housing cavity 18 inside the cover member 16. This makes it difficult for the inverter 31 and the converter 32 to be exposed to water, etc., and effectively prevents the inverter 31 and the converter 32 from being damaged by water, etc.

[0042] Furthermore, the converter 32 is disposed on the side of the engine 21 where the inverter 31 is located in the width direction of the traveling vehicle body 2, and is disposed in the vicinity of the inverter 31. This allows the inverter 31 and the converter 32 to be cooled using a common radiator 33, pump 46, and fan 48. Furthermore, because the inverter 31 and the converter 32 are disposed in close proximity to each other, it is possible to shorten the piping, such as tubes, that forms a path for circulating water as a refrigerant. By shortening the piping, etc. that forms the path for circulating water, pressure loss of the water refrigerant in the mechanism for cooling the inverter 31 and the converter 32 is suppressed, and it is possible to reduce the weight of the mechanism for cooling the inverter 31 and the converter 32.

[0043] Furthermore, by arranging the inverter 31 and the converter 32 as described above, it is possible to arrange the inverter 31 near the motor generator 26. By arranging the inverter 31 near the motor generator 26, it is possible to shorten the cable 38 between the inverter 31 and the motor generator 26, and power loss between the inverter 31 and the motor generator 26 is effectively suppressed. This ensures even more appropriate performance of the motor generator.

[0044] The above-described arrangement of the engine 21, post-treatment device 22, inverter 31, converter 32, etc. can also be applied to construction machines other than the crane 1. In other words, as long as the construction machine has a traveling body 2 and a revolving body 3, the engine 21, post-treatment device 22, inverter 31, converter 32, etc. can be installed as described above.

[0045] The present invention is not limited to the above-described embodiments, and various modifications can be made in the implementation stage without departing from the spirit of the invention. Furthermore, the embodiments may be implemented in combination as appropriate as possible, and in such cases, the combined effects can be obtained. Furthermore, the above-described embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining the disclosed multiple constituent elements. [Explanation of symbols]

[0046] 1...crane, 2...running body, 3...swivel body, 5...body frame, 15...engine cover, 16...cover member, 17...engine room, 18...accommodation cavity, 21...engine, 22...aftertreatment device, 25...torque converter, 26...motor generator, 31...inverter, 32...converter, 33...radiator, 46...pump, 48...fan

Claims

1. a traveling vehicle body having a vehicle body frame; a rotating body connected to the body frame of the traveling vehicle body from a vertically upper side and rotatable relative to the traveling vehicle body around a rotation axis along a vertical direction; an engine cover that is installed on the body frame from the vertically upper side at a rear side of the traveling vehicle body with respect to the rotation axis of the rotating body and forms an engine room therein; an engine that is disposed in the engine room and generates power when started; an aftertreatment device that is arranged alongside the engine on one side in the width direction of the traveling vehicle body and that aftertreatments exhaust gas from the engine and discharges the gas into the atmosphere; an inverter that is installed on the vehicle body frame from the vertically upper side outside the engine compartment and on the opposite side of the vehicle body width direction from the side on which the aftertreatment device is located with respect to the engine, and that converts power between DC power and AC power; a converter that is installed on the vehicle body frame from the vertically upper side outside the engine compartment and on the opposite side of the vehicle body width direction from the side on which the aftertreatment device is located with respect to the engine, and that converts DC power into a voltage; Construction machinery equipped with:

2. a cover member that is installed on the vehicle body frame from above outside the engine compartment and that defines an accommodation cavity therein for accommodating the inverter and the converter; At least one of the engine cover and the cover member separates the engine compartment from the accommodation cavity. The construction machine of claim 1.

3. a motor generator that generates power by being supplied with the AC power converted from the DC power in the inverter, and that converts kinetic energy due to the traveling of the traveling vehicle body into electrical energy to generate AC power and supplies the AC power to the inverter; a power supply that supplies the DC power converted into the AC power in the inverter to the inverter and also supplies the DC power to the converter; Further comprising: the converter performs voltage conversion on the DC power from the power supply and the DC power converted from the AC power by the inverter, and outputs the voltage-converted DC power.

3. The construction machine according to claim 1 or 2.

4. a pump that is installed on the vehicle body frame from the vertically upper side outside the engine compartment and on the opposite side of the vehicle body width direction from the side on which the aftertreatment device is located with respect to the engine, and that is operated to circulate the refrigerant through the inverter and the converter; a radiator that is installed on the vehicle body frame from the vertically upper side outside the engine compartment and on the opposite side of the vehicle body in the width direction from the side where the aftertreatment device is located, and that dissipates heat from the circulating refrigerant; The construction machine according to any one of claims 1 to 3, further comprising:

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