crane truck

Abstract

This crane truck comprises: a travelling device; a revolving frame that is supported by the travelling device; a main power apparatus that is provided to the travelling device and that is for travelling and for crane operation; and an auxiliary power apparatus that is supported by the revolving frame and that supplies power to an electronic device which is supported by the revolving frame.

Description

[Technical Field]

[0001] The present invention relates to a mobile crane. [Background technology]

[0002] A rough terrain crane, an example of a crane vehicle, is self-propelled and comprises a traveling gear, a swivel, and a boom (including a jib). The traveling gear is a vehicle body equipped with equipment for traveling. The traveling gear also comprises a carrier frame that serves as a skeleton, an engine that serves as a power source for traveling and for crane operation using the boom, traveling wheels that transmit the engine's power to the road surface, and outriggers to improve stability during operation. The swivel is located above the traveling gear. The swivel is rotatable in a horizontal plane relative to the traveling gear. The swivel is driven by the engine provided on the traveling gear.

[0003] The boom is mounted on a swivel base and rotates together with the swivel base relative to the traveling device. The boom also lifts and lowers loads and moves them to another location by extending and retracting, raising and lowering relative to the swivel base, and rotating the swivel base. With rough terrain cranes, an operator operates the crane while traveling and performs crane work using the boom from a control room (cabin) mounted on the swivel base (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-208959 Summary of the Invention [Problem to be solved by the invention]

[0005] In order to reduce engine fuel consumption, it is necessary to shut off the engine when the vehicle is not moving or when the crane is not in operation. Also, in order to reduce the environmental impact, it is necessary to shut off the engine to reduce emissions of greenhouse gases such as carbon dioxide (CO2).

[0006] However, if the engine is stopped when the crane is not in operation, the electrical systems powered by the engine cannot be used. For example, the air conditioning unit in the rough terrain crane's cabin and other accessory power sources (such as power supplied to USB (Universal Serial Bus; registered trademark) terminals) cannot be powered and cannot be used when the engine is stopped.

[0007] For this reason, for example, during the daytime in midsummer, when the outdoor temperature is extremely high, the temperature inside the cabin also becomes extremely high, and an appropriate air-conditioning environment is required for the health of the workers inside the cabin.In addition, even when the engine is stopped, it may be necessary to use accessory power supplies, etc.

[0008] The present invention has been made in consideration of the above circumstances, and aims to provide a crane truck that can supply the necessary power even when the engines for traveling and crane operation are stopped, while reducing fuel consumption and environmental load. [Means for solving the problem]

[0009] One aspect of the crane vehicle according to the present invention is: Running gear and a swivel base supported by the traveling device; On the swivel One side in the left / right direction a cockpit supported by a main power unit for traveling and crane operation provided on the traveling device; an auxiliary power unit provided on the swivel base for supplying power to electronic equipment in the cockpit while the main power unit is stopped; The auxiliary power unit is On the swivel Other side in left and right direction and generates the power to power electronic devices. Sub-engine and, On the swivel Other side in left and right direction Supported by And, the sub-engine is disposed behind the sub-engine. and a tank storing fuel for driving the vehicle. [Effects of the Invention]

[0010] The crane truck of the present invention can reduce fuel consumption and environmental impact, while allowing the auxiliary power unit to supply the necessary power to the equipment installed on the swivel base even when the engines for driving and crane operation are stopped. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view of a rough terrain crane as seen from the front right. [Figure 2] FIG. 2 is a perspective view of the rough terrain crane as seen from the left rear. [Figure 3A] FIG. 3A is a right side view showing the state in which the jib of the boom is deployed. [Figure 3B] FIG. 3B is a right side view showing the boom with the jib stored. [Figure 3C] FIG. 3C is a left side view showing a state in which the jib of the boom is stored. [Figure 4A] FIG. 4A is a plan view of the boom in a deployed state, corresponding to FIG. 3A, with the jib deployed. [Figure 4B] FIG. 4B is a plan view of the boom in a retracted state in which the jib is retracted, corresponding to FIGS. 3B and 3C. [Figure 5] FIG. 5 is a partial view of the right side of the crane showing the location of the auxiliary power unit (APU). [Figure 6] FIG. 6 is a view of a portion of the left side of the crane showing the placement of the APU. [Figure 7] Figure 7 is a plan view of the crane showing the placement of the APUs. [Figure 8] FIG. 8 is a cross-sectional view taken along the line AA in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] An embodiment of a mobile crane according to the present invention will be described below with reference to the drawings. Fig. 1 is a perspective view of a rough terrain crane 100 as seen from the front right. Fig. 2 is a perspective view of the rough terrain crane 100 as seen from the rear left. The rough terrain crane 100 shown in the drawings is one embodiment of a mobile crane according to the present invention.

[0013] (composition) As shown in Figure 1, a rough terrain crane 100 (hereinafter simply referred to as crane 100) comprises a traveling device 10, a swivel base 20, a boom 30, and a control room (cabin) 40. The crane 100 also comprises an auxiliary power unit 80 (APU) that is separate from an engine 13 provided on the traveling device 10 for traveling and crane operation.

[0014] The traveling device 10 is a vehicle body equipped with equipment for traveling on the ground such as a road. The traveling device 10 is equipped with a carrier frame 11, which forms the skeleton of the vehicle body, an engine 13, which is a power source for traveling and for crane operation using the boom 30, traveling wheels 14, which transmit the power of the engine 13 to the ground, and outriggers 12, which improve stability during operation.

[0015] The engine 13 is an example of a main power unit and is provided at the rear of the carrier frame 11. The engine 13 is a power source for driving the crane 100 and for performing crane work using the boom 30. When the engine 13 is operating, a generator attached to the engine 13 operates to generate electricity, for example, at a voltage of 48 V. This generated electricity is used to operate an air conditioning system (air conditioner) in the cabin 40 and to supply power to accessory components such as a USB (registered trademark) terminal provided in the cabin 40. The engine 13 and the generator may be considered an example of a main power unit. In this case, the electricity generated by the generator is an example of main power.

[0016] The outriggers 12 are made up of a front outrigger 12a provided near the front wheels 14 and a rear outrigger 12b provided near the rear wheels 14, and during crane operation, they extend outward in the vehicle width direction W and touch the ground, stabilizing the posture of the crane 100. The outriggers 12 are also extended and retracted using power generated by the engine 13.

[0017] The wheels 14 for traveling are provided on the left and right sides in the vehicle width direction W of the traveling device 10 and on the front and rear sides in the front-rear direction L, between the front and rear outriggers 12, respectively.

[0018] The swivel base 20 is disposed above the traveling device 10, approximately in the center in the front-to-rear direction L and in the center in the vehicle width direction W. The swivel base 20 is disposed so that the center of the traveling device 10 in the vehicle width direction W coincides with the center of rotation C (see Figures 7 and 8), and is disposed so as to be rotatable around the center of rotation C in a horizontal plane relative to the traveling device 10. The swivel base 20 is driven by the engine 13 provided on the traveling device 10 to rotate.

[0019] Fig. 3A is a right side view showing a state in which the jib 32 of the boom 30 is deployed. Fig. 3B is a right side view showing a state in which the jib 32 of the boom 30 is stored. Fig. 3C is a left side view showing a state in which the jib 32 of the boom 30 is stored. Fig. 4A is a plan view of the boom 30 in an deployed state corresponding to Fig. 3A, in which the jib 32 of the boom 30 is deployed. Fig. 4B is a plan view of the boom 30 in a stored state corresponding to Figs. 3B and 3C, in which the jib 32 of the boom 30 is stored.

[0020] The boom 30 and the cabin 40 are provided on the swivel base 20 and rotate integrally with the swivel base 20 relative to the traveling device 10. As shown in Figures 3A, 3B, 3C, 4A, and 4B, the boom 30 includes a telescopic boom 31 (basic boom) and a jib 32.

[0021] The base end 31b of the telescopic boom 31 is supported by a base bracket 25 attached to the swivel base 20 so that it can be raised and lowered freely. The base bracket 25 is an example of a bracket. The basic boom of the boom in the crane vehicle according to the present invention is not limited to a telescopic boom and may be a non-telescopic boom. The telescopic boom 31 is located approximately in the center of the vehicle width direction W of the crane 100. The cabin 40 is located on the left side of the boom 30 in the vehicle width direction W. The cabin 40 may also be located on the right side of the boom 30 in the vehicle width direction W.

[0022] The telescopic boom 31 telescopes between a contracted state in which multiple booms are nested inside one another and an extended state in which each boom protrudes axially from the other booms.

[0023] The jib 32 comprises a base end jib 321 and a tip end jib 322. The base end 321b of the base end jib 321 is attached to the tip end 31a of the tip boom of the telescopic boom 31. The base end 322b of the tip end jib 322 is attached to the tip end 321a of the base end jib 321. The jib of the boom in the crane vehicle according to the present invention is not limited to being composed of two base end jibs 321 and a tip end jib 322, as in the jib 32 of this embodiment, but may be one jib or three or more jibs.

[0024] The jib 32 is folded from the unfolded state shown in Figures 3A and 4A so that it lies along the right side of the base-end jib 321 by rotating the tip-end jib 322 clockwise in a plan view, as shown by the arrow in Figure 4A, around the part where it is attached to the base-end jib 321.

[0025] In addition, when the tip jib 322 is folded, the jib 32 rotates clockwise in a plan view as shown by the arrow in Figure 4A around the part where the base jib 321 is attached to the telescopic boom 31, thereby reaching a stored state in which the tip jib 322 is sandwiched between the jib 322 and is folded along the right side of the telescopic boom 31, as shown in Figures 4B, 3B, and 3C.

[0026] In a crane vehicle in which the cabin 40 is provided on the right side of the boom 30, the jib 32 is folded along the left side of the basic boom in the stored state. In other words, in the stored state, the jib is arranged along the side of the basic boom opposite the side where the operator's cabin is provided in the vehicle width direction. In other words, in the stored state, the jib 32 is arranged in the half opposite the cabin 40 and to the side of the boom 30.

[0027] The jib 32 is in the stored state shown in Figures 3B, 3C, and 4B, and is deployed as shown in Figures 3A and 4A by swinging the base end jib 321 counterclockwise to the right in a plan view and then swinging the tip end jib 322 counterclockwise to the right in a plan view. With the jib 32 in the deployed state, the boom 30 can be further extended from the state shown in Figures 3A and 4A by extending the telescopic boom 31.

[0028] (APU) Fig. 5 is a diagram showing a portion of the right side of the crane 100, showing the arrangement of the APU 80. Fig. 6 is a diagram showing a portion of the left side of the crane 100, showing the arrangement of the APU 80. Fig. 7 is a plan view of the crane 100, showing the arrangement of the APU 80. Fig. 8 is a cross-sectional view taken along line AA in Fig. 5.

[0029] The engine 13 provided on the traveling device 10 is stopped when the crane 100 is not traveling and when no crane operation is being performed, and this stopping reduces the fuel consumption of the engine 13 and the carbon dioxide emissions from the engine 13. The operation of the engine 13 may be automatically controlled by a control unit or may be manually controlled by the work vehicle.

[0030] The APU 80 mainly provides the power used in the cabin 40 while the engine 13 is stopped, and supplies power to, for example, the air conditioning in the cabin 40 and accessory parts such as a USB (registered trademark) terminal provided in the cabin 40. Therefore, the APU 80 is not provided on the traveling device 10, but on the swivel base 20, or on the base bracket 25 that rotates together with the swivel base 20, the cabin 40, or the like.

[0031] The APU 80 includes, for example, a main body 81, an electric system component 82 including a battery and a DC-DC converter, a fuel tank 83, an APU controller 84, an evaporator 85, and a capacitor 86.

[0032] The main body 81 corresponds to an example of an auxiliary power source. Although the main body 81 is an engine as an example, it is not limited to an engine as long as it is a power source that generates electric power. In addition to an engine, the main body 81 may specifically be a storage battery, a power receiving and output unit that receives electric power from an external source and outputs it, etc. The engine serving as the main body 81 (hereinafter referred to as a sub-engine) is smaller than the engine 13 provided in the traveling device 10, consumes less fuel (for example, fuel consumption per unit output), and is more fuel-efficient (good fuel economy) than the engine 13. In other words, the main body 81 is a device different from the engine 13 provided in the traveling device 10.

[0033] The fuel tank 83 is a tank that stores fuel for driving the sub-engine. Therefore, if the main body 81 is not an engine and does not require fuel, the fuel tank 83 may be omitted. Also, a tank that stores fuel for driving the engine 13 provided in the traveling device 10 is provided in the traveling device 10 separately from the fuel tank 83. If the sub-engine is driven by supplying fuel from a fuel tank provided in the traveling device 10, the fuel tank 83 may be omitted.

[0034] The battery in the electrical system component 82 starts the engine (hereinafter referred to as the sub-engine) serving as the main body 81, and charges and stores the electricity generated while the sub-engine is running. The DC-DC converter in the electrical system component 82 boosts the voltage of the power generated by the sub-engine to the voltage of the power generated by the engine 13. The DC-DC converter is an example of a boost device. The voltage of the power generated by the sub-engine is an example of auxiliary power.

[0035] The voltage of the power generated by the engine 13 provided in the traveling device 10 is set to 24 V, for example, and therefore the air conditioning system, USB (registered trademark) power supply, and other electrical equipment installed in the cabin 40 are set to operate at a voltage of 24 V. On the other hand, the voltage of the power generated by the sub-engine is set to 12 V, for example, and therefore this 12 V power cannot be used as is by the electrical equipment installed in the cabin 40.

[0036] The DC-DC converter in the electrical system component 82 boosts the voltage of the power generated by the sub-engine to the voltage of the power generated by the engine 13. Therefore, if the voltage of the power generated by the sub-engine is the same as the voltage of the power generated by the engine 13, the DC-DC converter in the electrical system component 82 cannot be provided.

[0037] 5 and 7, the above-mentioned main body 81, electrical system components 82, and fuel tank 83 are fixed to the swivel bed 20 directly or via a base bracket 25 that rotates together with the swivel bed 20 on the right side of the telescopic boom 31 in the vehicle width direction W. The main body 81, electrical system components 82, and fuel tank 83 are each disposed while being covered with a cover to protect them from wind and rain. The main body 81, which is a main component of the APU 80 (an essential component that is not omitted), is disposed below the jib 32 when the boom 30 is in a retracted state (the telescopic boom 31 is in a retracted state and the jib 32 is in a retracted state), in a space that overlaps with the jib 32 in a plan view, as shown in FIGS.

[0038] Here, as shown in FIG. 8 , the main body 81 is mounted on the swivel base 20 via a support bracket 81a. In the plan view shown in FIG. 8 , the main body 81 is disposed outside the swivel base 20. Therefore, in plan view, the main body 81 does not overlap the swivel base 20. As a result, the main body 81 does not overlap the inspection cover 23, which covers an inspection hatch formed on the top surface 20a of the swivel base 20 for maintenance purposes, from the top surface 20a side in plan view. The inspection hatch is a window through which a work vehicle can inspect and retighten bolts (plural bolts are arranged circumferentially along the outer periphery of the swivel base) that secure the swivel base 20. With this configuration, maintenance work, such as retightening bolts from above the swivel base 20 by attaching and detaching the inspection cover 23, is not impaired.

[0039] On the other hand, since the main body 81 does not overlap the swivel base 20 in a plan view, the bottom of the main body 81 is not blocked by the swivel base 20, as shown in Fig. 5, and a predetermined space is secured between the bottom surface of the main body 81 and the carrier frame 11 of the traveling device 10. As a result, maintenance of the main body 81 can be performed from the space secured below the main body 81 (for example, attaching and detaching a filter of the sub-engine), and the maintainability of the main body 81 is not impaired.

[0040] In this embodiment, electrical components 82, which are not a main component of the APU 80, are also disposed below the jib 32 in the stowed state, in a space overlapping the jib 32 in a plan view. Furthermore, in this embodiment, a fuel tank 83, which is not a main component of the APU 80, is also disposed below the jib 32 in the stowed state, in a space overlapping the jib 32 in a plan view.

[0041] 7, the electrical system components 82 and the fuel tank 83 overlap the swivel bed 20 in a plan view. On the other hand, the electrical system components 82 are provided above the swivel bed 20 at a distance, as shown in FIG. 5. Therefore, a space is provided above the inspection cover 23 (see FIG. 8) where maintenance can be performed by attaching and detaching the inspection cover 23. Therefore, the electrical system components 82 and the fuel tank 83 do not impair the ease of maintenance by attaching and detaching the inspection cover 23. In other words, the APU 80 is provided above the inspection cover 23, with the space for maintenance of the swivel bed 20 interposed therebetween.

[0042] 5, a space is provided on the right side, in the vehicle width direction W, of the support pin 38, which supports the hoisting cylinder 39 that hoists the boom 30 on the base bracket 25, where maintenance of the support pin 38 (such as supplying grease to the support pin 38) can be performed. Therefore, the arrangement of the electrical system components 82 does not impair the maintainability of the support pin 38.

[0043] The APU controller 84, evaporator 85, and condenser 86 constitute an air conditioning system for the cabin 40 powered by the sub-engine. An air conditioning system for the cabin 40 powered by the engine 13 provided on the traveling device 10 is provided separately. In other words, the crane 100 is equipped with an air conditioning system (main air conditioner) powered by the engine 13 provided on the traveling device 10, and an air conditioning system (sub-air conditioner; APU controller 84, evaporator 85, and condenser 86) powered by the sub-engine. The air conditioning system powered by the engine 13 is an example of a main electronic device. The air conditioning system powered by the sub-engine (in other words, the APU 80) is an example of an auxiliary electronic device.

[0044] The air conditioning system for the cabin 40 (specifically, the APU controller 84) selects the main air conditioner when the engine 13 is running. On the other hand, the air conditioning system for the cabin 40 (specifically, the APU controller 84) selects the sub-air conditioner when the engine 13 is stopped. The selected air conditioning system then performs air conditioning inside the cabin 40. This switching of the air conditioning system selection is performed by the APU controller 84. The APU controller 84 corresponds to an example of a control unit. The APU controller 84 selects a power unit that supplies power to electronic equipment (specifically, the air conditioning system) from the main power unit (specifically, the engine 13) and the auxiliary power unit (specifically, the APU 80) depending on the state of the engine 13. Specifically, when the engine 13 is running, the APU controller 84 selects the main power unit (specifically, the engine 13) as the power unit that supplies power to the air conditioning system. On the other hand, when the engine 13 is stopped, the APU controller 84 selects the auxiliary power unit (specifically, the APU 80) as the power unit that supplies power to the air conditioning system.

[0045] In this embodiment, the APU controller 84, evaporator 85, and condenser 86, which are not the main components of the APU 80, are arranged on the left side of the boom 30, the same side as the cabin 40. In other words, the APU controller 84, evaporator 85, and condenser 86 are not arranged in the space below the jib 32 in the stowed state.

[0046] As described above, the APU controller 84, the evaporator 85, and the condenser 86 are preferably disposed near the cabin 40 in order to condition the air inside the cabin 40. In particular, the evaporator 85 is a heat exchanger inside the cabin 40, and is therefore disposed inside the cabin 40, as shown in Figures 6 and 7. Furthermore, the APU controller 84 includes electronic components, and therefore needs to be protected from exposure to moisture such as rainwater or snow, and from exposure to high-temperature outside air, and is therefore disposed inside the cabin 40, just like the evaporator 85.

[0047] The APU controller 84 switches the selection of the air conditioning unit described above, controls the operation of the main body 81, controls the operation of the pump in the fuel tank 83, controls the operation of electrical components (DC-DC converter, battery) 82, and controls the supply of power (accessory power supply) to accessory components such as a USB (registered trademark) terminal provided in the cabin 40.

[0048] The condenser 86 should be located outside the cabin 40 in order to perform heat exchange opposite to that required within the cabin 40, and in this embodiment, is fixed to the base bracket 25 at the rear of the cabin 40, as shown in Figures 6 and 7.

[0049] As described above in detail, the crane 100 of this embodiment can supply the necessary power to the air conditioning system and accessory power source in the cabin 40 mounted on the swivel base 20 by the APU 80 when the engine 13 provided on the traveling device 10 is stopped.

[0050] Therefore, according to the crane 100 of this embodiment, fuel consumption and environmental load can be reduced, and the equipment provided on the swivel base can be used even when the engines for traveling and crane operation are stopped.

[0051] Furthermore, when the crane 100 of this embodiment has the jib 32, which swings out laterally, stored, the crane 100 has the main body 81, which is at least the main component of the APU 80, in the space below the jib 32 and on the swivel base 20 or in a portion that rotates integrally with the swivel base 20. Because the crane 100 has the APU 80 installed in an existing dead space, there is no need to newly provide space for arranging the APU 80.

[0052] In addition, in the crane 100 of this embodiment, in addition to the main body 81, which is the main component of the APU 80, the electrical system components 82 and fuel tank 83, which are not main components, are also arranged in the space below the jib 32 when the jib 32 is stored as described above, on the rotating base 20 or in a part that rotates integrally with the rotating base 20. However, in the crane vehicle according to the present invention, it is sufficient that at least the main component (power source) of the auxiliary power unit is arranged below the jib when the jib is stored in a lateral swing-out type, on the rotating base or in a part that rotates integrally with the rotating base.

[0053] The crane 100 of this embodiment is provided with electrical components 82 and a fuel tank 83 in addition to the main body 81 in the space below the jib 32 when the jib 32 is stored, and on the rotating base 20 or in a portion that rotates integrally with the rotating base 20. Therefore, at least some of the components of the APU 80 can be concentrated and arranged in one place.

[0054] In the crane 100 of this embodiment, the APU 80 does not overlap the inspection cover 23 of the rotating base 20 in a plan view, which prevents the inspection cover 23 from being attached or detached, thereby preventing the maintenance work, such as the above-mentioned retightening work, from being impaired.

[0055] Furthermore, in the crane 100 of this embodiment, the main body 81 of the APU 80 does not overlap the rotating base 20 in a plan view, and a predetermined space is formed below the main body 81, thereby preventing the maintenance of the main body 81 from being impaired.

[0056] Furthermore, in the crane 100 of this embodiment, a predetermined space is secured for the electrical system components 82 to the right of the support pin 38 of the hoisting cylinder 39 in the vehicle width direction W, thereby preventing the maintenance of the support pin 38 from being impaired.

[0057] The crane 100 of this embodiment is an example in which at least the main body 81 is arranged in a space below the jib 32 in the stored state, overlapping with the jib 32 in a planar view, but at least the main body 81 may also be arranged in a space on an extension of the jib 32 in the stored state or in a below space overlapping with an extension of the jib 32 in the stored state in a planar view.

[0058] In other words, when the jib 32 is considerably shorter than the telescopic boom 31, there is space to the side of the telescopic boom 31, on the extension line of the jib 32, or below that extension line, where the main body 81, etc. can be placed. Therefore, the crane vehicle according to the present invention includes those in which the main body 81, etc. is placed in the space on the extension line of the jib 32 or the space below the extension line of the jib 32.

[0059] In practice, from the viewpoint of ensuring lateral visibility from the cabin 40, it is preferable that the main body 81, etc. be placed in the space below the extension line of the jib 32, below the line of the lower end of the side window of the cabin 40.

[0060] The crane 100 of this embodiment has a jib 32 that swings out laterally, and the main components of the APU 80 are arranged in the space below the jib 32 when the jib 32 is in the stored state, but the crane vehicle of the present invention is not limited to one equipped with a jib that swings out laterally.

[0061] In other words, if the crane vehicle of the present invention does not have a jib that swings out laterally as a boom, but is equipped with a structure such as a hose reel on the side of the basic boom opposite the side on which the cabin 40 is provided in the vehicle width direction W, the main body 81 etc. may be arranged below the structure such as the hose reel in a space that overlaps the structure in a plan view.

[0062] In this case too, from the viewpoint of ensuring lateral visibility from the cabin 40, it is preferable that the main body 81 etc. be placed in the space below the structure, below the line of the lower edge of the side window of the cabin 40.

[0063] The disclosures of the specification, drawings, and abstract contained in Japanese Patent Application No. 2022-192928, filed December 1, 2022, are incorporated herein by reference in their entirety. [Industrial Applicability]

[0064] The present invention can be applied to various types of crane vehicles. [Explanation of symbols]

[0065] 10 Running gear 11 Carrier Frame 12 Outrigger 12a Front outrigger 12b Rear outrigger 13 Engine 14 wheels 20 Swivel 20a top surface 23 Inspection cover 25 Base bracket 30 Boom 31 Telescopic boom 31a Tip 31b End of the air 32 Jib 38 Support pin 39 Elevating Cylinder 40 Cabin 80 Auxiliary Power Unit (APU) 81 Main Unit 81a Support bracket 82 Electrical parts 83 Fuel Tank 84 APU controller 85 Evaporator 86 Capacitor 100 Rough terrain crane (crane truck) 321 Base end jib 321a Tip 321b Proximal end 322 Tip side jib 322b Proximal end C Rotation center L Anteroposterior direction W Vehicle width direction

Claims

1. Running gear and a swivel base supported by the traveling device; a control room supported on one side of the swivel base in the left-right direction; a main power unit for traveling and crane operation provided on the traveling device; an auxiliary power unit provided on the swivel base for supplying power to electronic devices in the cockpit while the main power unit is stopped; The auxiliary power unit is a sub-engine supported on the other side of the swivel base in the left-right direction and configured to generate electric power to be supplied to the electronic device; a tank supported on the other side of the swivel base in the left-right direction, disposed behind the sub-engine, and storing fuel for driving the sub-engine; Crane truck.

2. the sub-engine is supported on the swivel base via a support bracket and is disposed forward of the swivel base in a plan view; With the sub-engine supported on the swivel base via the support bracket, maintenance of the sub-engine can be performed from below the sub-engine. The crane truck according to claim 1.

3. The auxiliary power unit has a space for maintenance between a lower surface of the auxiliary power unit and the traveling device. The crane truck according to claim 2.

4. the main power unit has an engine and supplies power to the electronic device when the engine is running; the auxiliary power unit supplies power to the electronic equipment when the engine is stopped; The crane truck according to claim 1.

5. a control unit that selects a power unit that supplies power to the electronic device from the main power unit and the auxiliary power unit in accordance with a state of the engine; The crane truck according to claim 4.

6. The voltage of the power output by the auxiliary power unit is equal to the voltage of the power output by the main power unit. The crane truck according to claim 4.

7. the voltage of the auxiliary power output by the auxiliary power unit is lower than the voltage of the main power output by the main power unit; the auxiliary power unit has a booster device that boosts the voltage of the auxiliary power to the same value as the voltage of the main power. The crane truck according to claim 4.

8. The electronic device includes: a main electronic device powered by the main power output from the main power unit; and an auxiliary electronic device powered by auxiliary power output from the auxiliary power unit. The crane truck according to claim 5.

9. a boom supported on the swivel base; Further provided is a jib that is arranged in a half portion opposite to the cockpit in the left-right direction and to the side of the boom in a stored state, The sub-engine is disposed below the jib in the stored state. The crane truck according to claim 1.

10. a boom supported on the swivel base; Further provided is a jib that is arranged in a half portion opposite to the cockpit in the left-right direction and to the side of the boom in a stored state, The sub-engine is disposed in a space on an extension line of the jib in the stored state, or in a space below the jib in the stored state and overlapping with an extension line of the jib in the stored state in a plan view. The crane truck according to claim 1.

11. The swivel base has an inspection cover on its top surface, The auxiliary power unit is provided above the inspection cover via a space for maintenance of the swivel base. The crane truck according to claim 1.

12. a boom supported on the swivel base; a bracket that supports the boom on the swivel base; a boom lifting cylinder for lifting the boom; a support pin that supports the elevation cylinder on the bracket, the auxiliary power unit is provided on the side of the support pin via a space for maintenance of the support pin. The crane truck according to claim 1.

13. the sub-engine is disposed outside the swivel base and does not overlap the swivel base in a plan view, A space for maintenance of the sub-engine is provided below the sub-engine. The crane truck according to claim 1.

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