crane

Abstract

To provide a crane which can travel by electric power.SOLUTION: The crane comprises: a slewing upper structure supporting a boom; and a running vehicle body which supports the slewing upper structure and runs on the basis of electric power of a power source portion. The running vehicle body has: high-voltage equipment which is the power source portion or a device connected to the power source portion; a cooling device which is arranged above the high-voltage equipment, has an air exhaust port with an opened upper portion and cools the power source portion; and a dewatering tray which is provided between the high-voltage equipment and the cooling device, wastes water ingressed into the cooling device from the air exhaust port.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a crane.

Background Art

[0002] Patent Document 1 discloses a mobile crane including a lower traveling body having a traveling function and an upper slewing body provided rotatably above the lower traveling body. The lower traveling body has an engine and travels based on the power of the engine.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, from the viewpoints of environmental protection and the like, electrification of the above-described crane has been demanded.

[0005] An object of the present invention is to provide a crane capable of traveling by electric power.

Means for Solving the Problems

[0006] One aspect of the crane according to the present invention is an upper slewing body that supports a boom, a traveling vehicle body that supports the upper slewing body and travels based on the power of a power supply unit, and the traveling vehicle body includes a high-voltage device that is a device connected to the power supply unit or the power supply unit, a cooling device that is disposed above the high-voltage device, has an exhaust port that is open upward, and cools the power supply unit, and a drainage tray that is provided between the high-voltage device and the cooling device and drains water that has entered the cooling device from the exhaust port.

Effects of the Invention

[0007] According to the present invention, a crane that can be driven by electricity can be provided. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a schematic diagram of a mobile crane according to an embodiment. [Figure 2] Figure 2 is a block diagram schematically showing the system configuration of a mobile crane. [Figure 3] Figure 3 is a perspective view of a crane with some components omitted. [Figure 4] Figure 4 is a schematic diagram showing the area around the battery as viewed from above. [Figure 5] Figure 5 is a schematic diagram showing the area around the battery as viewed from the side. [Figure 6] Figure 6 is a cross-sectional view taken along the line C1-C1 in Figure 4. [Figure 7] Figure 7 is a perspective view of the support. [Figure 8] Figure 8 is a schematic plan view illustrating the positional relationship between the cooling device and the drainage tray of the cooling system. [Figure 9] Figure 9 is a schematic plan view illustrating the positional relationship between the drainage tray and the junction box. [Figure 10] Figure 10 is a diagram that shows a modified example of the support configuration of the junction box, and corresponds to the C1-C1 cross-sectional view in Figure 4. [Modes for carrying out the invention]

[0009] Hereinafter, an example of an embodiment of the crane according to the present invention will be described in detail with reference to the drawings. Note that the crane according to the embodiment described later is just one example of the crane according to the present invention, and the present invention is not limited to the embodiments described later.

[0010] [Embodiment] FIG. 1 is a schematic diagram of a mobile crane 1 (in the illustrated case, a rough terrain crane) according to the present embodiment. The mobile crane is, for example, an all terrain crane, a truck crane, or a loading type truck crane (also referred to as a cargo crane). However, the crane according to the present invention may be various cranes.

[0011] The mobile crane 1 has a lower traveling body 2 and an upper slewing body 3. The mobile crane 1 is an electric crane provided with a high-voltage battery 50 (see FIG. 2). The mobile crane 1 travels based on the power supplied from the high-voltage battery 50. That is, the mobile crane 1 does not have an engine.

[0012] Further, the mobile crane 1 executes operations other than traveling (for example, crane work, air conditioning, and / or heating) based on the power supplied from the high-voltage battery 50. The crane work is, for example, a slewing operation and / or a winch operation in a cargo transportation operation. Hereinafter, the specific configuration of the mobile crane 1 will be described.

[0013] First, referring to FIG. 1, the configuration of the upper slewing body 3 will be described. FIG. 1 is a schematic diagram of the mobile crane 1. The upper slewing body 3 is provided above the lower traveling body 2 and can slew around a slewing center axis α with respect to the lower traveling body 2. The upper slewing body 3 has a turntable 31, a telescopic boom 32, and a cab 33.

[0014] The turntable 31 is supported above the lower traveling body 2 via a bearing (not shown). The turntable 31 slews based on the power generated by a slewing actuator (not shown) provided in the upper slewing body 3.

[0015] In the case of the present embodiment, the slewing actuator is a hydraulic motor. This motor operates based on the supply and discharge of hydraulic oil. The hydraulic oil is supplied from the lower traveling body 2. Note that the slewing actuator may be an electric motor. In this case, the slewing electric motor is driven based on the power supplied from the high-voltage battery 50 described later.

[0016] The telescopic boom 32 is supported by the slewing platform 31 and has a plurality of booms that are telescopically combined. The telescopic boom 32 can change (pitch) its pitch angle based on the power generated by the pitching cylinder 34.

[0017] The pitching cylinder 34 is a telescopic hydraulic cylinder and is provided on the upper slewing body 3. The pitching cylinder 34 operates based on the supply and discharge of hydraulic oil. The hydraulic oil is supplied by a hydraulic oil supply device (not shown) provided on the lower traveling body 2.

[0018] Also, the telescopic boom 32 expands and contracts based on the power generated by the telescopic cylinder 35. The telescopic cylinder 35 is a hydraulic cylinder and is provided inside the telescopic boom 32. The telescopic cylinder 35 operates based on the supply and discharge of hydraulic oil. The hydraulic oil is supplied by a hydraulic oil supply device (not shown) provided on the lower traveling body 2.

[0019] Also, the telescopic boom 32 supports a wire rope 36. The wire rope 36 hangs down from the tip of the telescopic boom 32, and a hook 37 is provided at the tip. A part of the wire rope 36 is wound around a winch 38.

[0020] The winch 38 is driven (rotates) based on the power generated by a winch actuator (not shown). In the case of this embodiment, the winch actuator is provided on the slewing platform 31 and is a hydraulic motor. This motor operates based on the supply and discharge of hydraulic oil. The hydraulic oil is supplied by a hydraulic oil supply device (not shown) provided on the lower traveling body 2.

[0021] When the winch 38 rotates, the wire rope 36 is wound up or paid out according to the rotation direction of the winch 38. The winch motor may be an electric motor. In this case, the winch electric motor is driven based on the power supplied from a later-described high-voltage battery 50.

[0022] Next, the lower vehicle 2 will be described with reference to Figures 1 to 9. In describing the structure of the lower vehicle 2, the Cartesian coordinate system (X, Y, Z) shown in each figure will be used. The X direction corresponds to the front-to-back direction of the lower vehicle 2. The X-direction + side corresponds to the front side of the lower vehicle 2. The X-direction - side corresponds to the rear side of the lower vehicle 2. The Y direction corresponds to the left-to-right direction of the lower vehicle 2. The Y-direction + side corresponds to the left side when viewing the lower vehicle 2 from the rear to the front. The Y-direction - side corresponds to the right side when viewing the lower vehicle 2 from the rear to the front. The Z direction corresponds to the up-and-down direction of the lower vehicle 2. The Z-direction + side corresponds to the upper side of the lower vehicle 2. The Z-direction - side corresponds to the lower side of the lower vehicle 2.

[0023] The lower running body 2 is an example of a running vehicle body and is powered by electricity. Specifically, as shown in Figures 1 and 3, the lower running body 2 has a frame 20, a body 21, a front axle 22, a rear axle 23, a front tire 24, a rear tire 25, and outriggers 26.

[0024] The frame 20 extends in the front-rear direction and is, for example, a box-shaped member with a rectangular cross-section, and constitutes the skeleton of the lower running body 2. The frame 20 has an upper plate portion 20a, a lower plate portion 20b, a left plate portion 20c, a right plate portion 20d, a front plate portion 20e, and a rear plate portion 20f.

[0025] Furthermore, the frame 20 has a transmission member housing space 200 formed by through holes that penetrate the frame 20 in the vertical direction. The transmission member housing space 200 is located in the frame 20 at the central position between the front axle 22 and the rear axle 23.

[0026] Furthermore, the frame 20 has a battery housing space 201 formed by a through-hole that penetrates the frame 20 in the vertical direction. The battery housing space 201 is open at least at the top and is an example of a frame opening. The battery housing space 201 is located in the frame 20, extending from above the rear axle 23 to the rear end.

[0027] In other words, the battery housing space 201 can be considered to be located at the rear of the frame 20. The cross-sectional shape of the portion of the frame 20 in which the battery housing space 201 is formed is a closed cross-section composed of multiple continuous plate sections. Note that the cross-section of the frame 20 refers to the cross-section obtained when the frame 20 is cut along the YZ plane.

[0028] The location of the battery housing space is not limited to the illustrated example. The battery housing space may be located in the frame 20, extending from above the front axle 22 to the front end. In this case as well, the battery housing space may be formed by a through-hole that penetrates the frame 20 in the vertical direction.

[0029] The frame 20 has a pair of front outrigger support parts 202 at its front end. The frame 20 has a pair of rear outrigger support parts 203 at its rear end.

[0030] The front outrigger support section 202 is a frame for supporting the front outrigger 26a. The rear outrigger support section 203 is a frame for supporting the rear outrigger 26b.

[0031] The rear outrigger support section 203 is an example of an outrigger support frame and is located in the frame 20 at a position that overlaps vertically with a part of the battery housing space 201 (specifically, the rear end). Of the portion of the frame 20 where the battery housing space 201 is located, the portion corresponding to the rear outrigger support section 203 has higher rigidity compared to other portions.

[0032] The body 21 (see Figure 1) is a component that forms the outer shape of the lower running body 2 and is supported by the frame 20.

[0033] The front axle 22 is an axle member that extends in the left-right direction and is supported by the front end portion of the lower plate portion 20b of the frame 20. Front tires 24 are rotatably supported at both ends of the front axle 22 in the left-right direction.

[0034] The rear axle 23 is an axle member that extends in the left-right direction and is supported by the rear end portion of the lower plate portion 20b of the frame 20. Rear tires 25 are rotatably supported at both ends of the rear axle 23 in the left-right direction.

[0035] The outrigger 26 has a pair of front outriggers 26a and a pair of rear outriggers 26b. Each pair of front outriggers 26a is supported by a pair of front outrigger support parts 202 on the frame 20. Each pair of rear outriggers 26b is supported by a pair of rear outrigger support parts 203 on the frame 20.

[0036] Furthermore, the mobile crane 1 has a transmission member 4 provided between the lower traveling body 2 and the upper slewing body 3. Specifically, the transmission member 4 is located in the transmission member housing space 200 of the frame 20. Such a transmission member 4 is a member for transmitting electricity, fluids (hydraulic oil and / or compressed air), and signals between the lower traveling body 2 and the upper slewing body 3, which rotate relative to each other.

[0037] Furthermore, as shown in Figure 2, the mobile crane 1 has a high-voltage system 5. The configuration of the high-voltage system 5 will be described below.

[0038] The high-voltage system 5 is a system that operates the lower traveling body 2 and other operations (e.g., crane operation, air conditioning, and / or heating) based on power supplied from the high-voltage battery 50.

[0039] The high-voltage system 5 includes, as its main elements, a high-voltage battery 50, a junction box 51, a traction inverter 52, a traction motor 53, a transmission member 4, and an upper electric device 54. The elements constituting the high-voltage system 5 are connected by electrical circuits.

[0040] The high-voltage battery 50 is an example of a power supply unit and, as shown in Figures 4 and 5, has multiple batteries 501a, 501b, 502a, and 502b. Note that in Figure 4, the junction box 51, cooling device 80, and drain tray 9, which will be described later, are omitted. Batteries 501a and 501b are located in the battery housing space 201 of the frame 20.

[0041] Specifically, the front battery 501a and the rear battery 501b are arranged side by side in the battery housing space 201.

[0042] Batteries 501a and 501b are each fixed to the frame 20 using double-sided support. Now, referring to Figure 6, the manner in which the rear battery 501b is fixed to the frame 20 will be described.

[0043] Figure 6 is a cross-sectional view taken along the line C1-C1 in Figure 4. In other words, Figure 6 is a schematic diagram showing the area around the rear battery 501b as seen from the front. In the frame 20, the portion located to the left of the battery housing space 201 is the left frame 204. The left frame 204 is an example of the left frame section.

[0044] In frame 20, the portion located to the right of the battery housing space 201 is the right frame 205. The right frame 205 is an example of the right frame section. The battery housing space 201 is sandwiched between the left frame 204 and the right frame 205 in the left-right direction.

[0045] As shown in Figure 6, the rear battery 501b is fixed at its left and right ends to the left frame 204 and right frame 205. Specifically, the left end of the rear battery 501b is fixed to the lower end of the left frame 204 via a vibration-damping support member 503 such as a rubber mount.

[0046] Furthermore, the right end of the rear battery 501b is fixed to the lower end of the right frame 205 via a vibration-suppressing support member 504 such as a rubber mount.

[0047] The vibration-suppressing support members 503 and 504 suppress the transmission of twisting and vibration of the left frame 204 and the right frame 205 to the rear battery 501b, respectively. The manner in which the front battery 501b is fixed to the frame 20 is the same as the manner in which the rear battery 501b is fixed to the frame 20.

[0048] Thus, in this embodiment, the dead space of the frame 20 can be effectively utilized, allowing the high-voltage battery 50 to be compactly arranged and reducing damage to the high-voltage battery 50 due to impacts, etc. Furthermore, batteries 502a and 502b are located outside the frame 20 and above batteries 501a and 501b.

[0049] Furthermore, as described above, batteries 501a and 501b are fixed to the lower end of the frame 20, where the amount of deformation when the frame 20 twists is relatively small. Moreover, batteries 501a and 501b are fixed to the frame 20 via vibration-suppressing support members 503 and 504. Therefore, damage to batteries 501a and 501b caused by twisting of the frame 20 can be suppressed.

[0050] The junction box 51 is an example of high-voltage equipment and is installed on the lower traveling body 2. The junction box 51 is used to integrate or distribute the power supplied from the high-voltage battery 50. The junction box 51 is connected to the high-voltage battery 50 and the travel inverter 52.

[0051] Now, with reference to Figures 5 to 7, the junction box 51 will be described. The junction box 51 is located above the rear battery 501b in the battery housing space 201.

[0052] As shown in Figure 5, the lower half of the junction box 51 is positioned in the battery housing space 201. On the other hand, the upper half of the junction box 51 is positioned above the battery housing space 201. Note that the support 6, which will be described later, is omitted in Figure 5.

[0053] In this embodiment, the junction box 51 is cantilevered to the frame 20. Specifically, the junction box 51 is cantilevered to the left frame 204 of the frame 20 via a support 6 (see Figure 6).

[0054] In this embodiment, the junction box 51 is supported above a pair of rear outrigger support portions 203 on the frame 20. In other words, the junction box 51 is supported in a relatively rigid part of the frame 20. Therefore, the torsional influence from the frame 20 on the junction box 51 can be further suppressed in the rear of the vehicle, where it is greatly affected by torsion. Note that the position in which the junction box 51 is fixed is not limited to the position in this embodiment. The junction box 51 can be cantilevered and fixed around the battery housing space 201 on the frame 20.

[0055] Now, with reference to Figures 6 and 7, support 6 will be described. Support 6 is a component for cantilever-fixing the junction box 51 to the frame 20.

[0056] As shown in Figure 7, the support 6 has a front plate portion 60, a rear plate portion 61, a lower plate portion 62, and a fixing plate portion 63. In Figure 7, the shapes of each plate portion constituting the support 6 are shown schematically. The shape of each plate portion is not limited to the shape shown in Figure 7. For example, each plate portion may have a portion that has been cut out to reduce weight.

[0057] The front plate portion 60 is plate-shaped and parallel to the YZ plane (left-right and up-down directions). The front plate portion 60 has its longitudinal direction coincide with the left-right direction and its short direction coincide with the up-down direction. The front plate portion 60 faces the front side surface of the junction box 51 in the front-rear direction.

[0058] The rear plate portion 61 is plate-shaped and parallel to the YZ plane (left-right and up-down directions). In other words, the rear plate portion 61 is plate-shaped and parallel to the front plate portion 60. The rear plate portion 61 faces the front plate portion 60 in the front-rear direction.

[0059] The rear plate portion 61 has its longitudinal direction aligned with the left-right direction and its short direction aligned with the up-down direction. The rear plate portion 61 faces the rear side of the junction box 51 in the front-rear direction.

[0060] The lower plate portion 62 is plate-shaped and parallel to the XY plane (front-to-back and left-to-right directions). The lower plate portion 62 connects the lower end of the front plate portion 60 and the lower end of the rear plate portion 61 in the front-to-back direction. The lower plate portion 62 supports the junction box 51 from below.

[0061] For example, the junction box 51 is fixed to the lower plate portion 62 via a support member (not shown). The junction box 51 may also be fixed to the front plate portion 60 and the rear plate portion 61 via a support member (not shown).

[0062] The fixing plate portion 63 is plate-shaped and parallel to the XY plane (front-to-back and left-to-right directions). The fixing plate portion 63 connects the left end of the front plate portion 60 and the left end of the rear plate portion 61 in the front-to-back direction.

[0063] The fixing plate portion 63 is positioned above the lower plate portion 62. The fixing plate portion 63 is fixed to the upper surface of the frame 20 (specifically, the left frame 204) by fastening components such as bolts. The support 6 is fixed to the frame 20 by the fixing plate portion 63 being fixed to the frame 20.

[0064] Furthermore, the left end of support 6 (specifically, the fixing plate portion 63) is fixed to the frame 20, while the right end is not fixed to the frame 20. In other words, the left end of junction box 51 is fixed to the frame 20, while the right end is not fixed to the frame 20.

[0065] The rightmost end of support 6 is not in contact with frame 20 (specifically, the right frame 205). In other words, the rightmost end of support 6 (or junction box 51) is located to the left of the right frame 205.

[0066] Although not shown in the diagram, the right end of support 6 may be supported by the right frame 205 via, for example, a sliding plate. In this case, the right end of support 6 is movable relative to the right frame 205.

[0067] Furthermore, the shape of the support for fixing the junction box to the frame is not limited to the shape of support 6 in this embodiment. In this embodiment, support 6 fixes the junction box 51 to the left frame 204. However, the support may also fix the junction box 51 to the right frame 205.

[0068] In this embodiment, the support 6 fixes the junction box 51 to the upper surface of the frame 20 (specifically, the left frame 204). However, the support 6 may also fix the junction box 51 to the side of the frame 20 (specifically, the left frame 204) (i.e., the right side of the left frame 204).

[0069] The junction box 51 is fixed to the support 6. Specifically, the junction box 51 is located in the space enclosed by the front plate portion 60, the rear plate portion 61, and the lower plate portion 62. The junction box 51 is fixed to the support 6 via a support member (not shown).

[0070] As described above, in this embodiment, the junction box 51 is cantilevered to the left frame 204. This configuration prevents the twisting of the left frame 204 and the right frame 205 from being transmitted to the junction box 51, even if they twist during crane operation. As a result, damage to the junction box 51 caused by the twisting of the frame 20 can be suppressed.

[0071] Specifically, the twisting of the left frame 204 and the right frame 205 described above is caused by the rotation of the telescopic boom 32. For example, when the telescopic boom 32 rotates to the right of the mobile crane 1, the vertical reaction force acting on the right front outrigger 26a becomes greater than the vertical reaction force acting on the left front outrigger 26a.

[0072] Based on the difference in reaction forces acting on these outriggers, a moment acts on the frame 20 in a predetermined direction. This moment then causes the left frame 204 and the right frame 205 to twist.

[0073] For example, if the junction box 51 is fixed to both the left frame 204 and the right frame 205, twisting of the left frame 204 and the right frame 205 may be transmitted to the junction box 51 (support 6 in this embodiment), potentially damaging the junction box 51 (support 6 in this embodiment).

[0074] On the other hand, in this embodiment, since the junction box 51 is fixed in the manner described above, damage to the junction box 51 caused by twisting of the frame 20 can be suppressed.

[0075] Furthermore, the mobile crane 1 of this embodiment, having the configuration described above, is equipped with a cooling system 8 and a drainage tray 9, as shown in Figures 2 and 6. The configurations of the cooling system 8 and the drainage tray 9 will be described below.

[0076] The cooling system 8 is a device for cooling the high-voltage batteries 50 (specifically, batteries 501a, 501b, 502a, and 502b). As shown in Figure 2, the cooling system 8 has a cooling device 80 and a cooling pipe 81.

[0077] The cooling device 80 is a device that supplies cooling water to the cooling pipe 81. The cooling pipe 81 is configured in an annular shape. The first end (inlet end) of the cooling pipe 81 is connected to the supply port of the cooling device 80. The second end (outlet end) of the cooling pipe 81 is connected to the return port of the cooling device 80. The cooling pipe 81 is arranged to surround the high-voltage battery 50.

[0078] Cooling water supplied from the supply port of the cooling device 80 passes through the cooling pipe 81 and returns to the cooling device 80 via the return port of the cooling device 80. As the cooling water passes through the cooling pipe 81, it cools the high-voltage battery 50. The cooling water that returns to the cooling device 80 is cooled by a fan (not shown) inside the cooling device 80 and then supplied to the cooling pipe 81 from the supply port.

[0079] The housing 800 houses a fan (not shown) for cooling the cooling water. The housing 800 also has intake holes (not shown) on its side for drawing air into the housing 800. The fan cools the cooling water by blowing the air drawn in through the intake holes onto the pipe through which the cooling water flows.

[0080] Furthermore, as shown in Figure 8, the housing 800 has an exhaust port 802 on its top surface 801 for discharging the air cooled by the cooling water to the outside of the housing 800. The housing 800 also has a plurality of drainage holes 803 on its bottom surface. In Figure 8, the drainage holes 803 are indicated by hatched lines.

[0081] The cooling device 80, having the configuration described above, is installed above the junction box 51, as shown in Figure 6. The cooling device 80 is fixed to the frame 20 by a support (not shown).

[0082] Furthermore, the area where the junction box 51 and the cooling device 80 are located is covered by the rear vehicle cover 210 (see Figure 6) of the body 21. The rear vehicle cover 210 is a plate-shaped member that covers a predetermined area at the rear of the frame 20.

[0083] The upper surface 801 of the housing 800 in the cooling device 80 faces the inner surface (in other words, the lower surface) of the rear vehicle cover 210 in the vertical direction. The rear vehicle cover 210 has an exhaust section 211 (see Figure 6) at a position facing the exhaust port 802 of the housing 800 in the vertical direction. The exhaust section 211 is composed of, for example, a plurality of through holes that penetrate the rear vehicle cover 210 in the vertical direction.

[0084] The exhaust section 211 is the part through which the air discharged from the exhaust port 802 of the housing 800 passes. The air that passes through the exhaust section 211 is discharged to the outside of the rear vehicle cover 210.

[0085] As described above, since the exhaust section 211 is provided in the rear vehicle cover 210 at a position corresponding to the exhaust port 802 of the housing 800, the exhaust port 802 of the housing 800 can be considered to be exposed to the outside of the rear vehicle cover 210.

[0086] Therefore, for example, in rainy weather, water that enters from the exhaust section 211 enters the housing 800 through the exhaust port 802. The water that enters the housing 800 is then discharged downwards through the drain hole 803 provided on the bottom surface of the housing 800.

[0087] In this embodiment, a junction box 51, which is a high-voltage device, is located below the cooling device 80 (housing 800). Therefore, it is undesirable for water discharged below the housing 800 to come into contact with the terminals 510 (see Figure 9) of the junction box 51.

[0088] Therefore, in this embodiment, a drain tray 9 (see Figure 6) is provided between the junction box 51 and the cooling device 80 (housing 800).

[0089] In other words, the drain tray 9 is located above the junction box 51 and below the cooling device 80 (housing 800).

[0090] The drain tray 9 is tray-shaped and has a bottom portion 90 and a peripheral wall portion 91. The drain tray 9 is supported by the junction box 51 via a support member (not shown). In other words, the drain tray 9 is cantilevered to the frame 20 (specifically, the left frame 204) via the junction box 51. Since the junction box 51 is cantilevered to the frame 20 (specifically, the left frame 204) via a support 6, it can also be considered that the drain tray 9 is supported by the support 6.

[0091] The bottom surface 90 is plate-shaped. The peripheral wall 91 is provided along the outer edge of the bottom surface 90. The peripheral wall 91 is plate-shaped perpendicular to the bottom surface 90 and is continuous around the entire circumference of the bottom surface 90. In this embodiment, the height of the peripheral wall 91 is the same around the entire circumference. However, the height of the peripheral wall 91 may differ in parts.

[0092] The drain tray 9 collects the water discharged downward from the cooling device 80 (housing 800) and drains it in a predetermined direction.

[0093] In this embodiment, the drain tray 9 is tilted at a predetermined angle with respect to the horizontal direction such that the right rear is the lowest point. The drain tray 9 has a drain opening (not shown) at its right rear end. The drain tray 9 guides the collected water to the right rear for drainage.

[0094] The drain tray 9 has a drain hose 92 (see Figures 8 and 9) at its right rear end. The drain hose 92 is connected to a drain port (not shown) of the drain tray 9. The drain hose 92 guides the water drained from the drain port of the drain tray 9 to a predetermined position on the mobile crane 1. Specifically, the drain hose 92 discharges the water into the space below the rear end of the mobile crane 1.

[0095] The drain hose 92 may be omitted. In this case, the drain hose 92 may drain water to a position on the upper surface of the frame 20 that is behind the battery housing space 201. In this configuration, the water drained from the drain hose 92 can wash away sand and dust adhering to the upper surface of the frame 20.

[0096] Here, the positional relationship between the junction box 51, the drain hose 92, and the cooling device 80 (housing 800) will be explained with reference to Figures 8 and 9.

[0097] Figure 8 is a schematic plan view illustrating the positional relationship between the cooling device 80 (housing 800) and the drain tray 9 of the cooling system 8. A plan view refers to a diagram showing the junction box 51, drain hose 92, and cooling device 80 (housing 800) as viewed from above. A plan view means viewing the components from above.

[0098] In Figure 8, the solid line represents the cooling device 80 (housing 800). Also, the dashed-dot line in Figure 8 represents the drain tray 9.

[0099] Furthermore, in Figure 8, the areas with diagonal hatching indicate the exhaust port 802 of the cooling device 80 (housing 800). In addition, in Figure 8, the areas with hatched lines indicate the drainage holes 803 provided on the bottom surface of the cooling device 80 (housing 800).

[0100] Figure 9 is a schematic plan view illustrating the positional relationship between the drain tray 9 and the junction box 51.

[0101] In Figure 9, the area indicated by the dashed line corresponds to the drain tray 9. In Figure 9, the area indicated by the dotted line corresponds to the junction box 51.

[0102] First, as shown in Figure 8, the drain tray 9 is positioned so as to overlap vertically with a part of the cooling device 80 (housing 800). Specifically, the drain tray 9 is positioned so as to overlap vertically with the exhaust port 802 of the cooling device 80 (housing 800).

[0103] Furthermore, the drain tray 9 is positioned so as to overlap the drain holes 803 of the cooling device 80 (housing 800) in the vertical direction. Preferably, the drain tray 9 overlaps all of the drain holes 803 in the vertical direction.

[0104] However, the drain tray 9 does not need to overlap all of the drain holes 803 in the vertical direction. In this case, the drain tray 9 may be positioned so as to overlap, for example, the drain holes 803 that overlap the junction box 51 (specifically, the terminals 510) in the vertical direction.

[0105] Next, as shown in Figure 9, the drain tray 9 is positioned so as to overlap a portion of the junction box 51 in the vertical direction. Specifically, the drain tray 9 is positioned so as to overlap at least the terminals 510 of the junction box 51 in the vertical direction.

[0106] In summary, the drain tray 9 is positioned so as to overlap vertically with the exhaust port 802 of the cooling device 80 (housing 800), the drain hole 803 of the cooling device 80 (housing 800), and the terminal 510 of the junction box 51, in the vertical direction between the cooling device 80 and the junction box 51.

[0107] As described above, the mobile crane 1 according to this embodiment is equipped with a drainage tray 9, which prevents water discharged downward from the cooling device 80 (housing 800) from coming into contact with the terminals 510 of the junction box 51, etc.

[0108] <Operation and Effects of This Embodiment> According to this embodiment having the above configuration, a mobile crane 1 that can travel based on the power of a high-voltage battery 50 can be realized.

[0109] In particular, in this embodiment, since the junction box 51 is cantilevered to the frame 20, damage to the junction box 51 caused by twisting of the frame 20 can be suppressed. The reason for this is as described above.

[0110] Furthermore, in this embodiment, a drain tray 9 is provided between the junction box 51 and the cooling device 80 (housing 800) in the vertical direction. This prevents water discharged downward from the cooling device 80 (housing 800) from coming into contact with the terminals 510 of the junction box 51. Other functions and effects that can be obtained from the configuration of the mobile crane 1 according to this embodiment are as described above.

[0111] <Note> In the embodiment described above, the junction box 51 is fixed to the upper surface of the frame 20 (specifically, the left frame 204). In this state, the upper half of the junction box 51 is positioned above the battery housing space 201. In other words, the upper half of the junction box 51 is positioned above the upper surface of the frame 20.

[0112] The vertical position of the junction box 51 is determined to satisfy the constraints imposed by the arrangement of the junction box 51 and the devices positioned above and below it (for example, the rear battery 501b and the cooling device 80).

[0113] For example, if the constraint requires that the vertical position of the junction box 51 be lower than the vertical position of the junction box 51 in this embodiment, the junction box 51 may be cantilevered to the side of the frame 20 (for example, the right side of the left frame 204), as shown in Figure 10.

[0114] In the modified example shown in Figure 10, the junction box 51 is also fixed to the frame 20 (specifically, the left frame 204) via the support 6A. Alternatively, the junction box 51 may be cantilevered to the left side of the right frame 205.

[0115] Furthermore, in the above-described embodiment, the batteries 501a, 501b, 502a, and 502b of the high-voltage battery 50 are located at the rear of the frame 20. However, the battery (hereinafter referred to as the front battery) may be located at the front of the frame 20.

[0116] In this case, the front battery may be located in a battery housing space provided at the front of the frame 20. A junction box corresponding to the front battery (hereinafter referred to as the front junction box) may also be provided at the front of the frame 20.

[0117] In this case as well, the front junction box may be cantilevered to the frame 20 by a structure similar to the support structure of the junction box 51 in the above-described embodiment, or the support structure of the junction box 51 in the modified example shown in Figure 10.

[0118] Furthermore, in the above-described embodiment, the junction box 51 is an example of high-voltage equipment. However, high-voltage equipment is not limited to the junction box. For example, the high-voltage equipment may be the high-voltage battery 50 (specifically, the rear battery 501b). Alternatively, the high-voltage equipment may be various devices connected to the high-voltage battery 50.

[0119] Furthermore, in the above-described embodiment, the drain tray 9 is tilted at a predetermined angle with respect to the horizontal direction such that the right rear is the lowest point. However, the direction of inclination of the drain tray is not limited to the above-described embodiment. For example, the drain tray may be tilted at a predetermined angle with respect to the horizontal direction such that the left rear is the lowest point. In this case, the drain tray may have a drain opening (not shown) at the left rear end. The drain tray may then drain the collected water to the left rear. [Industrial applicability]

[0120] The crane according to the present invention is not limited to rough terrain cranes, but may be various types of mobile cranes, such as all-terrain cranes. [Explanation of symbols]

[0121] 1 Mobile crane 2 Lower running body 20 frames 20a Upper plate section 20b Lower plate part 20c Left side plate 20d Right side plate 20e Front panel 20f Rear plate part 200 Transmission member housing space 201 Battery housing space 202 Front outrigger support section 203 Rear outrigger support section 204 Left side frame 205 Right side frame 21 Body 210 Rear vehicle cover 211 Exhaust section 22 Front axle 23 Rear axle 24 Front tire 25 Rear tire 26 Outriggers 26a Front outrigger 26b Rear outrigger 3. Upper rotating body 31 Turntable 32 Telescopic Boom 33 Cab 34. Cylinder for raising and lowering 35 Telescopic Cylinder 36 Wire rope 37 hooks 38 winches 4. Transmission member 5. High-voltage electrical systems 50 High-voltage batteries 501a, 501b Battery 502a, 502b Battery 503, 504 Vibration suppression support members 51 Junction Box 510 terminal 52 Inverter for driving 53. Motor for driving 54 Upper motorized devices 6, 6A support 60 Front plate section 61 Rear plate section 62 Lower plate section 63 Fixing plate section 8 Cooling System 80 Cooling device 800 Housing 801 Top surface 802 Exhaust port 803 Drain hole 81 Cooling pipe 9 Drain tray 90 Bottom part 91 Peripheral wall section 92 Drain hose

Claims

1. The upper rotating body that supports the boom, The vehicle comprises a vehicle body that supports the aforementioned upper rotating body and moves based on the power of the power supply unit, The aforementioned vehicle body is The power supply unit or a high-voltage device connected to the power supply unit, A cooling device is provided, positioned above the aforementioned high-voltage equipment, having an exhaust port with an open top, and for cooling the power supply unit. The device includes a drain tray provided between the high-voltage equipment and the cooling device, for draining water that has entered the cooling device through the exhaust port. crane.

2. The high-voltage equipment, which is a device connected to the power supply unit, is a junction box that distributes the power from the power supply unit to the electric devices. The crane according to claim 1.

3. The drain tray guides the water to the right rear or left rear for drainage. The crane according to claim 1.

4. The drainage tray, in a plan view of the crane, overlaps with the exhaust port and also overlaps with the terminals of the high-voltage equipment. The crane according to claim 1.

5. The drain tray has a hose for guiding the water. The crane according to claim 1.

6. The aforementioned vehicle body has a frame on which the power supply unit is located and which has a frame opening that is open at least at the top. The high-voltage equipment is cantilevered and fixed above the power supply unit to one of the frame sections, the left frame section and the right frame section, which sandwich the frame opening. The crane according to claim 1.

7. The drain tray is supported by the high-voltage equipment. The crane according to claim 1.

8. The drain tray drains the water to the upper surface of the frame behind the frame opening. The crane according to claim 6.

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