Work equipment

Abstract

The present invention prevents fan noise with a simple fan control.　A turning work machine (1) comprises: a radiator fan (94a) (first cooling fan); an oil cooler fan (97a) (second cooling fan); a temperature detection unit (TD) that detects the temperature of a cooling target; a storage unit (121) that stores first data defining a correspondence relationship between a detected temperature from the temperature detection unit (TD) and a first target rotation speed, which is the target rotation speed of the radiator fan (94a), and second data defining a correspondence relationship between the detected temperature from the temperature detection unit (TD) and a second target rotation speed, which is the target rotation speed of the oil cooler fan (97a); and a control device (120) that controls the rotation speed of the radiator fan (94a) to the first target rotation speed corresponding to the detected temperature from the temperature detection unit (TD), and controls the rotation speed of the oil cooler fan (97a) to the second target rotation speed corresponding to the detected temperature from the temperature detection unit (TD). The second target rotation speed is set such that the difference with respect to the first target rotation speed is at least a prescribed difference, regardless of the detected temperature from the temperature detection unit (TD).

Description

[Technical Field]

[0001] The present invention relates to a work machine such as a backhoe. [Background technology]

[0002] The rotating work machine disclosed in Patent Document 1 includes a first cooling fan for cooling a first cooling object, a second cooling fan for cooling a second cooling object, and a controller, and the controller rotates the first cooling fan at a target rotation speed corresponding to the temperature of the first cooling object, and rotates the second cooling fan at a target rotation speed corresponding to the temperature of the second cooling object. For example, when two cooling fans rotate at similar rotation speeds (i.e., rotation speeds less than a predetermined difference), the vibrations of both cooling fans combine to produce a humming noise.

[0003] Therefore, in the rotating work machine disclosed in Patent Document 1, the controller determines whether the difference between the target rotation speeds of the first and second cooling fans is less than a predetermined difference, and if it determines that the difference is less than the predetermined difference, the controller changes the target rotation speeds of the first and second cooling fans so that the target rotation speeds of the first and second cooling fans become equal to or greater than the target rotation speeds and so that the difference between the target rotation speeds of the first and second cooling fans becomes equal to or greater than the predetermined difference, thereby preventing the generation of a humming noise. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2016-50428 Summary of the Invention [Problem to be solved by the invention]

[0005] In the rotating work machine of Patent Document 1, the control of changing the target rotation speeds of the first and second cooling fans to prevent humming noise is complicated, and there is a problem in that the change control places a burden on the controller.

[0006] The present invention has been made to solve the problems of the prior art, and has an object to provide a work machine that can prevent humming noise with simple fan control. [Means for solving the problem]

[0007] A work machine according to one aspect of the present invention includes a first cooling fan, a second cooling fan, The cooling device cools the cooling water or hydraulic oil. The cooling system comprises a temperature detection unit that detects the temperature of an object to be cooled, a memory unit that stores first data that defines a correspondence relationship between the temperature detected by the temperature detection unit and a first target rotation speed that is a target rotation speed of the first cooling fan, and second data that defines a correspondence relationship between the temperature detected by the temperature detection unit and a second target rotation speed that is a target rotation speed of the second cooling fan, and a control device that controls the rotation speed of the first cooling fan to the first target rotation speed that corresponds to the temperature detected by the temperature detection unit and controls the rotation speed of the second cooling fan to the second target rotation speed that corresponds to the temperature detected by the temperature detection unit, wherein the first data defines the first target rotation speed for each of a plurality of first temperature divisions, and the second data defines the second target rotation speed for each of a plurality of second temperature divisions, and the second target rotation speeds corresponding to all of the second temperature divisions are set so that the difference between the second target rotation speeds corresponding to all of the first temperature divisions and the first target rotation speeds corresponding to all of the first temperature divisions is equal to or greater than a predetermined difference, except when the second target rotation speed is zero.

[0008] The cooling device includes a radiator that cools the cooling water and an oil cooler that cools the hydraulic oil, The first cooling fan , the radiator The second cooling fan is provided to cool the , the oil cooler The temperature detecting unit is provided to cool the Coolant cooled by the radiator a first temperature detection unit for detecting the temperature of the Hydraulic oil cooled by an oil cooler and a second temperature detection unit that detects the temperature of the first temperature detection unit, wherein the first data defines a correspondence relationship between the temperature detected by the first temperature detection unit and the first target rotation speed, and the second data defines a correspondence relationship between the temperature detected by the second temperature detection unit and the second target rotation speed.

[0009] The first data is radiator The first target rotation speed is a storage table or an arithmetic expression in which the first target rotation speed is predefined for each of the plurality of first temperature ranges, and the second data is Oil cooler A storage table in which second target rotation speeds are predefined for each of the plurality of second temperature ranges. and the control device is radiator identifying the first temperature section to which the detected temperature of the first temperature detection unit belongs among the plurality of first temperature sections, and rotating the first cooling fan at the first target rotation speed corresponding to the identified first temperature section; Oil cooler The second temperature category to which the detected temperature of the second temperature detection unit belongs may be identified from among the plurality of second temperature categories, and the second cooling fan may be rotated at the second target rotation speed corresponding to the identified second temperature category.

[0010] The second data includes a second target rotation speed that is greater than the maximum value of the first target rotation speed. Oil cooler The second temperature section may be defined so that the second target rotation speed increases continuously as the temperature detected by the second temperature detection section increases.

[0011] The first cooling fan and the second cooling fan the radiator or the oil cooler The cooling device may be provided to cool the

[0012] The work machine may include a battery unit and a detection unit that detects whether the battery unit is in a charged state or a discharged state, and when the detection unit detects the charged state of the battery unit, the control device may rotate the first cooling fan at a predetermined first specified rotation speed and rotate the second cooling fan at a predetermined second specified rotation speed that is equal to or greater than a predetermined difference from the first specified rotation speed.

[0013] The work machine is equipped with a temperature detection unit that detects the temperature of the battery unit, and when the detection unit detects the state of charge of the battery unit, the control device may rotate the first cooling fan at the first specified rotation speed and rotate the second cooling fan at the second specified rotation speed if the temperature of the battery unit detected by the temperature detection unit is equal to or higher than a set temperature, and may not drive the first cooling fan and the second cooling fan if the temperature of the battery unit is lower than the set temperature.

[0014] The work machine may be provided with a cooling unit that is an integrated unit of a frame body, the first cooling fan and the second cooling fan that are attached side by side to one side of the frame body, and a shroud that surrounds the first cooling fan and the second cooling fan.

[0015] The shroud may include a first elastic support that supports the first cooling fan and a second elastic support that supports the second cooling fan.

[0016] The shroud is a rectangular tube that surrounds both the first cooling fan and the second cooling fan, and includes a fixed portion having an upper side, a left side, a lower side, and a right side, and a guide portion that extends from the fixed portion outward toward the exhaust side and guides the cooling air generated by driving the first cooling fan and the cooling air generated by driving the second cooling fan, and the lower side has a first notch at a location that supports the first cooling fan and a second notch at a location that supports the second cooling fan, and the first elastic support is provided in the first notch, and the second elastic support is provided in the second notch.

[0017] The work machine may be provided with a reception unit that receives an instruction to change the specified difference, and the control device may change at least one of the first data and the second data stored in the memory unit in accordance with the change instruction received by the reception unit.

[0018] The work machine may include a hydraulically driven work device and a water cooling path that cools the equipment to be cooled by circulating cooling water, and the first cooling fan may be a radiator fan for cooling the cooling water, and the second cooling fan may be an oil cooler fan for cooling hydraulic oil for driving the work device. [Effects of the Invention]

[0019] According to the above-described working machine, the humming noise can be prevented by simple fan control. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 2 is a schematic side view showing the swing work machine. [Figure 2] FIG. 2 is a schematic plan view showing the swing work machine. [Figure 3] FIG. 2 is a schematic rear view showing the swing work machine. [Figure 4] FIG. 2 is a block diagram showing a system of a swing work machine. [Figure 5] FIG. 2 is a right rear perspective view showing the swivel base, the battery unit, the electrical equipment, and the cooling unit. [Figure 6] FIG. 2 is a right rear perspective view showing the swivel base, the protection mechanism, and the exterior cover. [Figure 7] FIG. [Figure 8] FIG. 2 is a view of the cooling unit as seen from the exhaust side. [Figure 9] FIG. 2 is a plan view of the cooling unit. [Figure 10] FIG. 2 is a view of the cooling unit as seen from the intake side. [Figure 11] FIG. 2 is a perspective view showing the oil cooler and the radiator attached to the frame of the cooling unit. [Figure 12] FIG. 4 is a diagram showing a control map showing how the radiator fan is rotated at a first target rotation speed determined in advance in accordance with the temperature of the coolant. [Figure 13]FIG. 4 is a diagram showing a control map indicating that the oil cooler fan is rotated at a second target rotation speed that is a predetermined difference or more from a first target rotation speed, the second target rotation speed being determined in advance according to the temperature of the hydraulic oil. [Figure 14] 3A to 3C are diagrams illustrating storage tables stored in a storage unit. [Figure 15] FIG. [Figure 16] FIG. [Figure 17] FIG. 2 is a diagram showing a water-cooling path using a radiator. [Figure 18] 4 is a flowchart showing a control process for a radiator fan and an oil cooler fan. [Figure 19] 10 is a flowchart showing a control process of a first modified example. [Figure 20] FIG. 10 is a diagram showing an example of a screen for changing a predetermined difference. [Figure 21] 10A and 10B are diagrams illustrating respective storage tables stored in a storage unit after changes. DETAILED DESCRIPTION OF THE INVENTION

[0021] An embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a schematic side view of a swivel work machine 1. Fig. 2 is a schematic plan view of the swivel work machine 1. Fig. 3 is a schematic rear view of the swivel work machine 1. First, the overall configuration of the swivel work machine 1 will be described. As shown in Fig. 1, the swivel work machine 1 (work machine) is a backhoe or the like that includes a swivel base (machine body) 2, a lower traveling body 10, and a work device 20. The swivel work machine 1 is also an electrically driven work machine. A driver's seat 8 in which an operator sits is provided on the swivel base 2. The driver's seat 8 is surrounded by a protective mechanism 80, such as a cabin.

[0022] In this embodiment, the direction toward which the driver seated in the driver's seat 8 of the swivel work machine 1 faces (the direction of arrow A1 in Figures 1, 2, etc.) is referred to as the forward direction, the opposite direction (the direction of arrow A2 in Figures 1, 2, etc.) as the rearward direction, the driver's left side (the near side in Figure 1, the direction of arrow B1 in Figures 2 and 3, etc.) as the left side, and the driver's right side (the far side in Figure 1, the direction of arrow B2 in Figures 2 and 3, etc.) as the right side. Also, the horizontal direction perpendicular to the fore-and-aft direction A3 will be referred to as the width direction B3 (see Figures 2 and 3). The direction from the center of the width direction B3 of the swivel base 2 toward the right or left side will be referred to as the outward width direction. Operable operating devices 5 are provided around the driver's seat 8, and the swivel work machine 1 is operated by operating the operating devices 5.

[0023] The swivel base 2 is rotatable about a rotation axis (vertical axis) X that extends in the vertical direction. Specifically, the swivel base 2 is supported on the undercarriage 10 via a rotation bearing 3 so as to be rotatable about the rotation axis X (rotatable to the left and right). The center of the rotation bearing 3 is the rotation axis X (rotation center), and a rotation motor (not shown), which will be described later, is attached to the swivel base 2. This rotation motor is a hydraulic device M driven by hydraulic oil discharged from a hydraulic pump P, and is a motor that rotates the swivel base 2 about the rotation axis X. The swivel base 2 is provided with an exterior cover (cover) 70, brackets, stays, etc. The exterior cover 70 forms a space (rear room R) at the rear of the swivel base 2 in which equipment, tanks, other parts, etc. are arranged. The brackets, stays, etc. are members for attaching the above-mentioned parts, etc.

[0024] 1 and 2, the lower traveling body 10 has a traveling frame 11 and a traveling mechanism 12. The traveling frame (track frame) 11 is a structure to which the traveling mechanism 12 is attached and which supports the swivel base 2 on its upper portion.

[0025] The traveling mechanism 12 is, for example, a crawler type. The traveling mechanism 12 has an idler 13, drive wheels 14, a plurality of rollers 15, an endless crawler belt 16, and hydraulic equipment M (travel motors ML, MR) of the traveling system that is driven by hydraulic oil discharged from a hydraulic pump P. The traveling motors ML, MR are composed of hydraulic motors, and drive the drive wheels 14 to cause the crawler belt 16 to circulate in the circumferential direction. A dozer device 18 is attached to the front of the lower traveling body 10 and is driven up and down by the extension and contraction of a dozer cylinder C5 (M), which is a hydraulic cylinder (hydraulic actuator).

[0026] As shown in Figures 1 and 2, the working device 20 is provided on the front side of the swivel base 2. As shown in Figure 1, the working device 20 has a boom 21, an arm 22, and a bucket (working implement) 23. The base end of the boom 21 is pivotally attached to a swing bracket 24 so as to be rotatable about a horizontal axis (an axis extending in the width direction B3), allowing the boom 21 to swing up and down (vertically). The arm 22 is pivotally attached to the tip of the boom 21 so as to be rotatable about the horizontal axis, allowing the arm 22 to swing back and forth or up and down. The bucket 23 is attached to the tip of the arm 22 so as to be able to perform scooping and dumping operations. Instead of or in addition to the bucket 23, the swivel working machine 1 can be equipped with another working implement (hydraulic attachment) that can be driven by hydraulic oil. Other working tools include hydraulic breakers, hydraulic crushers, angle brooms, earth augers, pallet forks, sweepers, mowers, and snow blowers.

[0027] As shown in FIG. 1, the swivel work machine 1 is equipped with working hydraulic equipment M that operates using hydraulic oil discharged from a hydraulic pump P, and the work device 20 is driven by the operation of the working hydraulic equipment M. In this embodiment, the hydraulic equipment M includes a swing cylinder C1, a boom cylinder C2, an arm cylinder C3, and a bucket cylinder C4. The swing cylinder C1, the boom cylinder C2, the arm cylinder C3, and the bucket cylinder C4 are configured as hydraulic cylinders (hydraulic actuators). As shown in FIG. 1, the swing bracket 24 is capable of swinging by extension and retraction of the swing cylinder C1 provided on the right side of the swivel base 2. The boom 21 is capable of swinging by extension and retraction of the boom cylinder C2. The arm 22 is capable of swinging by extension and retraction of the arm cylinder C3. The bucket 23 is capable of scooping and dumping by extension and retraction of the bucket cylinder C4.

[0028] Therefore, the hydraulic equipment M provided in the swing work machine 1 includes the swing motor, travel motors ML and MR, swing cylinder C1, boom cylinder C2, arm cylinder C3, and bucket cylinder C4. The hydraulic equipment M also includes a control valve V that controls the above-mentioned hydraulic cylinders, and a hydraulic oil tank T. As shown in FIG. 2, the hydraulic oil tank T and the control valve V are disposed forward of the hydraulic pump P.

[0029] Fig. 4 is a block diagram showing the system of the swivel work machine 1. Fig. 5 is a right rear perspective view showing the swivel base 2, battery unit 90, electrical equipment 92, and cooling unit CU. As shown in Fig. 4, the swivel work machine 1 is equipped with the battery unit 90, an electric motor 91, electrical equipment 92, a charging port 93, and the cooling unit CU. As shown in Fig. 5, the battery unit 90, electric motor 91, electrical equipment 92, charging port 93, and cooling unit CU are provided on the swivel base 2.

[0030] The battery unit 90 is an electric device that can store electricity and output the stored electricity.

[0031] The electric motor 91 is a drive source driven by the power output from the battery unit 90. The electric motor 91 is a three-phase AC synchronous motor with embedded permanent magnets. The rotation speed of the electric motor 91 is controlled, for example, by a rotation speed control device 5c. The rotation speed control device 5c can set a range of the motor rotation speed of the electric motor 91 when setting the motor rotation speed of the electric motor 91 according to a current value that changes in response to operation of the operating device 5. The rotation speed control device 5c is, for example, a dial-like switch such as a selector switch having multiple switching positions, and target rotation speed values ​​of the electric motor 91 are assigned to the multiple switching positions. The rotation speed control device 5c can set a range of the target rotation speed of the electric motor 91, for example, within a range of 1500 to 2600 rpm / min. The electric motor 91 may be another type of synchronous motor, or may be an AC motor or a DC motor. The rotation speed of the electric motor 91 may also be controlled based on a preset table in response to the amount of operation of the operating device 5.

[0032] The electric motor 91 rotates a drive shaft using power supplied from the battery unit 90, and transmits driving force from the drive shaft to the hydraulic pump P. The hydraulic pump P is connected to the drive shaft of the electric motor 91 and is driven by the driving force transmitted from the drive shaft. In other words, the hydraulic pump P is driven by the driving of the electric motor 91 and discharges hydraulic oil.

[0033] 2, the electric motor 91 and the hydraulic pump P are arranged side by side in the front-to-rear direction A3 on the other side (right side) of the center line Y in the width direction B3 of the swivel base 2, and on the side of the battery unit 90 as shown in FIGS. 6 and 7. Specifically, the electric motor 91 and the hydraulic pump P are arranged below and to the side (right side) of the battery unit 90.

[0034] As shown in Fig. 5, the electrical components 92 are arranged side by side in the width direction B3 above the battery unit 90. As shown in Fig. 4, the electrical components 92 are directly or indirectly connected to the battery unit 90 and are devices that transmit power supplied by the battery unit 90 or are operated by the power. The electrical components 92 are, for example, a junction box 92a, an inverter 92b, and a DC / DC converter 92c. The junction box 92a is connected to the battery unit 90 and other devices including the inverter 92b, and transmits power supplied from the battery unit 90 to the other devices.

[0035] The inverter 92b is provided in a power supply path 132 from the battery unit 90 to the electric motor 91, and adjusts the power output to the electric motor 91. In this embodiment, the inverter 92b is connected to the junction box 92a and the electric motor 91. The inverter 92b is a device that drives the electric motor 91, and converts DC power into three-phase AC power and supplies the three-phase AC power to the electric motor 91. The inverter 92b can arbitrarily change the current and voltage of the power supplied to the electric motor 91.

[0036] The DC / DC converter 92c converts the voltage of the input direct current into a different voltage. In this embodiment, the DC / DC converter 92c is a step-down converter that converts the input voltage into a lower voltage. The DC / DC converter 92c is provided, for example, in the swing work machine 1, and supplies power to an on-board battery 96 that supplies power to electronic devices.

[0037] FIG. 6 is a right-rear perspective view showing the swivel base 2, the protection mechanism 80, and the exterior cover 70. As shown in FIG. 6, the exterior cover 70 includes an upper hood 71, a rear hood 72, a left hood 73, a right hood 74, and a right front hood 75. The upper hood 71 is a cover member that forms the upper portion of the rear room R and is removably attached to the support frame 35 while covering the battery unit 90 and electrical components 92. The rear hood 72 is a cover member that forms the rear portion of the rear room R and is attached to the support frame 35. The left hood 73 is a cover member that forms the left side of the rear room R and is formed with the air intake 73a shown in FIG. 1. The air intake 73a is, for example, configured by multiple horizontally elongated openings arranged vertically, but is not limited to this configuration. The right hood 74 is a cover member that forms the right rear portion of the rear room R. An inspection door 76 is provided on the right hood 74. The inspection door 76 can be opened and closed relative to the right hood 74, and is provided with an exhaust section 77 for exhausting air from inside the exterior cover 70. The right front hood 75 is located in front of the right hood 74, and is a cover member that forms the right front section of the rear room R.

[0038] Charging port 93 is a socket to which a cable that stores electricity in battery unit 90 is connected, and power is supplied from an external source. As shown in Figures 3 and 6, when connecting charging port 93 to a cable that supplies power from an external source, charging lid (lid member) 72a attached to rear hood 72 is opened, and charging port 93 is exposed from exterior cover 70. Charging lid 72a is swingably connected to rear hood 72 by a hinge or the like, and can be opened and closed around the swing axis of the hinge.

[0039] 7 is an exploded perspective view of the cooling unit CU. The cooling unit CU is an assembly that integrates a frame 98, a cooling device CA, a fan unit FU, and a shroud 110. The cooling device CA is a device that cools equipment and is attached to one side of the frame 98 (i.e., the side facing the exterior cover 70). The fan unit FU is attached to one side of the frame 98 adjacent to the cooling device CA, with its intake side facing the cooling device CA. The fan unit FU has fans F (a radiator fan 94a and an oil cooler fan 97a). The shroud 110 is attached to the fan unit FU.

[0040] Fig. 8 is a view of the cooling unit CU as seen from the exhaust side. Fig. 9 is a plan view of the cooling unit CU. Fig. 10 is a view of the cooling unit CU as seen from the intake side. Fig. 11 is a perspective view showing the oil cooler 97 and the radiator attached to the frame of the cooling unit CU.

[0041] 7 and 11, a cooling device CA is attached to one surface of the frame body 98. Specifically, a radiator 94 (first cooling target) and an oil cooler 97 (second cooling target) are attached to one surface of the frame body 98 and arranged side by side in the longitudinal direction of the frame body 98.

[0042] The cooling device CA includes a radiator 94 that cools the electric devices and an oil cooler 97 that cools the hydraulic oil that drives the working device 20. The radiator 94 is a device that cools the cooling water (refrigerant) that cools the electric motor 91, the electrical components 92, etc. The radiator 94 has a water supply section 94c at its top that is supplied with the cooling water. The radiator 94 is cooled (heat removed) by a radiator fan 94a (described later). The radiator fan 94a generates cooling air by rotating and removes heat from the radiator 94. The radiator fan 94a draws in air around the radiator 94 and discharges it from the inside of the rear room R to the outside of the rear room R through an opening in the exterior cover 70. As a result, the cooling air, which has been heated by heat exchange with the radiator 94, is discharged to the outside. Note that although the outer surface of the radiator 94 is flat in FIGS. 7 and 11, this is not limiting. The outer surface of the radiator 94 may have an uneven shape, a corrugated shape, a shape with multiple fins, or the like, in order to enhance heat dissipation.

[0043] The oil cooler 97 is a device that cools the hydraulic oil discharged from the hydraulic pump P. The oil cooler 97 is cooled by an oil cooler fan 97a, which will be described later. The oil cooler fan 97a generates cooling air by rotating, draws in air around the oil cooler 97, and discharges the drawn air from the inside of the rear room R formed by the exterior cover 70 to the outside.

[0044] 3, the radiator 94 and the oil cooler 97 are disposed above the hydraulic pump P and the electric motor 91. As a result, the radiator fan 94a and the oil cooler fan 97a suck in the air around the battery unit 90, including the air from which the battery unit 90 has radiated heat, and the air that has radiated heat from the hydraulic pump P and the electric motor 91 and moved upward, and discharges the air to the outside of the aircraft.

[0045] As shown in Fig. 10, the frame 98 is a steel plate having a substantially rectangular shape when viewed in the direction of arrow B1, and has a bottom surface portion 98f whose lower end is bent and extended in the direction of arrow B2 as shown in Fig. 11. The frame 98 also has openings 98d and 98e formed at locations where the radiator 94 and oil cooler 97 that constitute the cooling unit CU face each other. That is, the openings 98d and 98e of the frame 98 are arranged side by side (in the front-to-rear direction A3). One opening 98d is approximately the same size as the radiator 94. The other opening 98e is approximately the same size as the oil cooler 97.

[0046] As shown in FIG. 7 , a fan unit FU is attached to one side of the frame 98. The fan unit FU includes a radiator fan 94a (first cooling fan) that cools the radiator 94, an oil cooler fan 97a (second cooling fan) that cools the oil cooler 97, and a mounting frame 99 to which the radiator fan 94a and the oil cooler fan 97a are attached side by side. The mounting frame 99 is a generally gate-shaped frame having a mounting plate 99a and legs 99b that bend and extend from both ends of the mounting plate 99a toward the frame 98. The oil cooler fan 97a and the radiator fan 94a are attached to the mounting plate 99a side by side in the longitudinal direction of the fan unit FU (front-rear direction A3). A circular opening facing the oil cooler 97 is formed in the mounting plate 99a at a location where the oil cooler fan 97a is located. Furthermore, a circular opening facing the radiator 94 is formed in the mounting plate portion 99a at a location where the radiator fan 94a is located. As described above, the fan unit FU is attached to one surface of the frame body 98 with the intake side of the radiator fan 94a facing the radiator 94 and the intake side of the oil cooler fan 97a facing the oil cooler 97.

[0047] 7 to 9, the shroud 110 is attached to the mounting frame 99 of the fan unit FU so as to surround both the radiator fan 94a and the oil cooler fan 97a. The shroud 110 guides the cooling air generated by the radiator fan 94a and the cooling air generated by the oil cooler fan 97a.

[0048] The shroud 110 includes a square cylindrical fixed portion 111 that surrounds both the radiator fan 94a and the oil cooler fan 97a, and a guide portion 112 that extends outward from the fixed portion 111 on the exhaust side and guides the cooling air generated by driving the radiator fan 94a and the cooling air generated by driving the oil cooler fan 97a.

[0049] Fig. 15 is a perspective view showing the shroud. Fig. 16 is a cross-sectional view of the shroud. As shown in Figs. 7, 15, etc., the fixing part 111 is a rectangular cylindrical frame having an upper side 111a, a left side 111b, a lower side 111d, and a right side 111c. Both the radiator fan 94a and the oil cooler fan 97a are surrounded by this rectangular cylindrical frame (fixing part 111).

[0050] 7, 8, 16, etc., the lower side portion 111d is provided with a first elastic support 113 that supports the lower part of the case of the radiator fan 94a and a second elastic support 114 that supports the lower part of the case of the oil cooler fan 97a. Specifically, as shown in Fig. 15, the lower side portion 111d has a first notch 115 at a location corresponding to the lower part of the case of the radiator fan 94a and a second notch 116 at a location corresponding to the lower part of the case of the oil cooler fan 97a. The first elastic support 113 is provided in the first notch 115, and the second elastic support 114 is provided in the second notch 116.

[0051] The guide portion 112 has a downwardly inclined extending portion 112a extending diagonally downward outward from an end portion of a lower side portion 111d of the fixed portion 111, and a right-side bent extending portion 112b bending and extending from an end portion of a right side portion 111c of the fixed portion 111 toward the opening side of the fixed portion 111. As shown in Fig. 16, the protruding length L11 of the right-side bent extending portion 112b from the fixed portion 111 is shorter than the protruding length L12 of the downwardly inclined extending portion 112a from the fixed portion 111.

[0052] 9 and 10, the frame 98 has an air filter 100 and an attachment portion 105 on the other side opposite to the one side (i.e., the side opposite to the side facing the exterior cover 70) to which the air filter 100 is attached. The air filter 100 includes a first air filter 100A for the radiator 94 and a second air filter 100B for the oil cooler 97.

[0053] In the mounting portion 105, the first air filter 100A and the second air filter 100B are arranged side by side in the longitudinal direction of the frame 98 (front-rear direction A3).

[0054] Here, the water-cooling path 95 through the radiator 94 will be described. FIG. 17 is a diagram showing the water-cooling path 95 through the radiator 94. As shown in FIG. 17, the rotating work machine 1 is provided with a water-cooling path 95 that connects the radiator 94, the electric motor 91, and electrical components 92 (for example, an inverter 92b and a DC / DC converter 92c), and through which refrigerant cooled by the radiator 94 and refrigerant that has undergone heat exchange in the electric motor 91 and the electrical components 92 flow. The water-cooling path 95 is provided with a cooling pump 95a that discharges cooling water and circulates the cooling water as a refrigerant. In this embodiment, the water-cooling path 95 circulates cooling water from the radiator 94 through the cooling pump 95a, the inverter 92b, the DC / DC converter 92c, and the electric motor 91 to the radiator 94. Specifically, the water-cooling path 95 includes a feed water passage 95b, a return water passage 95c, a first water passage 95d, a second water passage 95e, and a third water passage 95f.

[0055] 12, the feed water passage 95b is a water passage that sends refrigerant from the electric motor 91 etc. to the radiator 94, more specifically, the feed water passage 95b connects the electric motor 91 and the radiator 94 and allows the refrigerant to flow from the electric motor 91 to the radiator 94. The return water passage 95c is a water passage that returns the refrigerant from the radiator 94 to the cooling pump 95a, more specifically, it connects the radiator 94 and the cooling pump 95a and allows the refrigerant to flow from the radiator 94 to the cooling pump 95a.

[0056] The first water passage 95d connects the cooling pump 95a and the inverter 92b and allows the refrigerant to flow from the cooling pump 95a to the inverter 92b. The second water passage 95e connects the inverter 92b and the DC / DC converter 92c and allows the refrigerant to flow from the inverter 92b to the DC / DC converter 92c. The third water passage 95f connects the DC / DC converter 92c and the electric motor 91 and allows the refrigerant to flow from the DC / DC converter 92c to the electric motor 91. That is, the cooling water cooled by the radiator 94 flows from the radiator 94 through the return water passage 95c, the cooling pump 95a, the first water passage 95d, the inverter 92b, the second water passage 95e, the DC / DC converter 92c, the third water passage 95f, the electric motor 91, and the feed water passage 95b, before returning to the radiator 94.

[0057] As shown in Fig. 4, the swivel working machine 1 is equipped with a control device 120 and a storage unit 121. The control device 120 is a device configured from electric and electronic circuits, programs stored in a CPU, etc., and controls various devices of the swivel working machine 1. For example, the control device 120 controls the rotation speed of the electric motor 91 based on the operation of a rotation speed operating device 5c that is provided around the driver's seat 8 and can be operated. The control device 120 also controls the start of the swivel working machine 1 based on the operation of a starter switch 7 that is provided around the driver's seat 8 and can be operated to start the swivel working machine 1.

[0058] The storage unit 121 is a non-volatile memory or the like, and stores various information related to the control of the control device 120. For example, the storage unit 121 stores information such as a table related to the rotation speed of the electric motor 91 in relation to the operation amount of the rotation speed operation device 5c.

[0059] As shown in FIG. 4, the battery unit 90 includes a plurality of batteries 90a. The plurality of batteries 90a are connected in parallel to one another. The batteries 90a are capable of storing electricity and are secondary batteries such as lithium-ion batteries or lead-acid batteries. The battery 90a has a plurality of cells therein, and the plurality of cells are electrically connected in series and / or parallel. In this embodiment, the battery unit 90 has two batteries 90a. Note that the number of batteries 90a included in the battery unit 90 does not have to be a plurality and is not limited to two.

[0060] As shown in FIG. 4, the slewing work machine 1 includes a connection switching unit 131. The connection switching unit 131 switches a power supply path 132 from a battery 90a to an electric motor 91 between a connected state and a cut-off state for each battery 90a. The connection switching unit 131 switches between the connected state and the cut-off state, for example, by performing a relay opening / closing operation on at least a portion of the power supply path 132. As a result, the battery unit 90 outputs power from the batteries 90a in the connected state among the multiple batteries 90a, and stops the output of power from the other batteries 90a in the cut-off state. The control of the connection switching unit 131, i.e., the setting of the batteries 90a that output power from the battery unit 90, is performed by the control device 120.

[0061] Each battery 90a has a BMU (battery management unit) 123 that monitors and controls the battery 90a. The BMU 123 acquires the voltage, temperature, current, terminal voltage of the internal cells, etc. of the battery 90a, and calculates the remaining capacity of the battery 90a. The BMU 123 can also control the opening and closing of relays inside the battery 90a, and can control the start and stop of power supply to the battery 90a. The BMU 123 (detection unit) can also determine whether the battery unit 90 is in a charging state (i.e., charging) or a discharging state (i.e., in use) by acquiring the voltage, current, etc. of the battery 90a. The BMU 123 may be built into each battery 90a or installed externally to each battery 90a.

[0062] The control device 120 sets one of the plurality of batteries 90a in a connected state as an output battery that outputs power from the battery unit 90, and sets the other batteries 90a in a cutoff state as stopped batteries that do not output power. The control device 120 has a battery control unit 120a that controls the switching of the output battery.

[0063] The battery control unit 120a is connected to the connection switching unit 131 via wire or wireless communication and controls the connection switching unit 131 by transmitting signals. As a result, the battery control unit 120a switches between the connected state and the cut-off state of the multiple batteries 90a, and performs switching control (switching process) of the output battery and the stopped battery.

[0064] The battery control unit 120a controls switching between the output battery and the stopped battery based on predetermined conditions. Specifically, when the driving of the working device 20 is prohibited or limited, the battery control unit 120a sets the output battery and the stopped battery based on the selector 122 communicably connected to the control device 120 and the remaining capacity of each of the multiple batteries 90a.

[0065] The battery control unit 120a sets the battery 90a selected via the selector 122 as the output battery. On the other hand, the battery control unit 120a sets the battery 90a not selected via the selector 122 as the stopped battery. The selector 122 selects one battery 90a from the multiple batteries 90a based on the operator's operation. That is, the selector 122 receives an instruction from the operator to select the battery 90a to be used as the output battery. For example, the selector 122 is a plurality of operation switches that are arranged around the driver's seat 8 and can be pressed. Each of the multiple operation switches is associated with a battery 90a, and operating one operation switch selects the battery 90a associated with that operation switch.

[0066] 4, the rotating work machine 1 is equipped with a first drive motor 30b that drives the oil cooler fan 97a and a second drive motor 94b that drives the radiator fan 94a. The oil cooler fan 97a and the radiator fan 94a can be driven independently of the electric motor 91. Control of the oil cooler fan 97a and the radiator fan 94a will be described below.

[0067] The first drive motor 30b and the second drive motor 94b are each connected to a control device 120. The control device 120 has a fan control unit 120b that controls the driving of the first drive motor 30b and the second drive motor 94b. The fan control unit 120b independently controls the first drive motor 30b (radiator fan 94a) and the second drive motor 94b (oil cooler fan 97a).

[0068] As shown in Fig. 4, the rotating work machine 1 is equipped with a water temperature detection unit 126 (first temperature detection unit) and an oil temperature detection unit 127 (second temperature detection unit) as temperature detection units TD that detect the temperature of the object to be cooled. The water temperature detection unit 126 is a sensor that detects the temperature of the coolant (refrigerant) as a voltage value. The water temperature detection unit 126 is provided, for example, in the feed water passage 95b, and detects the temperature RT of the coolant heading to the radiator 94. The water temperature detection unit 126 is connected to the control device 120 by wire or wirelessly, and outputs detected coolant temperature information to the control device 120 as a signal.

[0069] The oil temperature detection unit 127 is a sensor that detects the temperature OT of the hydraulic oil as a voltage value. The oil temperature detection unit 127 is provided, for example, in a pipe connected to the oil cooler 97, and detects the temperature OT of the hydraulic oil heading to the oil cooler 97. The oil temperature detection unit 127 is connected to the control device 120 by wire or wirelessly, and outputs detected temperature information of the hydraulic oil to the control device 120 as a signal.

[0070] When the BMU 123 detects that the battery unit 90 is in a discharging state (battery output, i.e., in use), the fan control unit 120b (control device 120) rotates the radiator fan 94a at a first target rotation speed that is predetermined in accordance with the coolant temperature RT detected by the water temperature detection unit 126. Fig. 12 is a diagram showing a control map CM1 that defines the relationship between the coolant temperature RT and the first target rotation speed. The control map CM1 shown in Fig. 12 has a characteristic that the first target rotation speed of the radiator fan 94a changes in a stepwise manner as the coolant temperature RT increases.

[0071] 12, the fan control unit 120b does not drive the radiator fan 94a if the coolant temperature RT is 0° C.≦RT<50° C. The fan control unit 120b rotates the radiator fan 94a at a predetermined first target rotation speed (1200 rpm) if the coolant temperature RT is 50° C.≦RT<60° C., at the predetermined first target rotation speed (1600 rpm) if 60° C.≦RT<70° C., and at the predetermined first target rotation speed (2000 rpm) if 70° C.≦RT.

[0072] When the BMU 123 detects that the battery unit 90 is in a discharged state (battery output, i.e., in use), the fan control unit 120b (control device 120) rotates the oil cooler fan 97a at a second target rotation speed that is predetermined in accordance with the hydraulic oil temperature OT detected by the oil temperature detection unit 127. The second target rotation speed is set to be different from the first target rotation speed by a predetermined difference (e.g., 200 rpm) or more, regardless of the coolant temperature and the hydraulic oil temperature. FIG. 13 is a diagram showing a control map CM2 that defines the relationship between the hydraulic oil temperature OT and the second target rotation speed. The control map CM2 shown in FIG. 13 has a characteristic that the second target rotation speed of the oil cooler fan 97a changes in a stepwise manner as the hydraulic oil temperature OT increases.

[0073] 13, the fan control unit 120b does not drive the oil cooler fan 97a if the hydraulic oil temperature OT detected by the oil temperature detection unit 127 is 0° C.≦OT<40° C. The fan control unit 120b rotates the oil cooler fan 97a at a predetermined second target rotation speed (1000 rpm) if the hydraulic oil temperature OT is 40° C.≦OT<50° C. The fan control unit 120b rotates the oil cooler fan 97a at a predetermined second target rotation speed (1400 rpm) if 50° C.≦OT<60° C. The fan control unit 120b rotates the oil cooler fan 97a at a predetermined second target rotation speed (1800 rpm) if 60° C.≦OT<70° C. The fan control unit 120b rotates the oil cooler fan 97a at a predetermined second target rotation speed (2200 rpm) if 70° C.≦OT.

[0074] 14 is a diagram showing memory tables DT1, DT2, and DT3 stored in memory unit 121. Memory unit 121 (storage device) stores memory table DT1 (first data) in which first target rotation speeds are predefined for each of a plurality of temperature ranges of radiator 94 (first cooling target), and memory table DT2 (second data) in which second target rotation speeds that always have a difference of at least a predetermined value (for example, 200 rpm) from the first target rotation speed are predefined for each of a plurality of temperature ranges of oil cooler 97 (second cooling target).

[0075] As described above, the fan control unit 120b changes the first target rotation speed of the radiator fan 94a and the second target rotation speed of the oil cooler fan 97a in stages, and sets the target rotation speeds to have a difference of at least a predetermined difference (for example, 200 rpm). In this way, the fan control unit 120b can set the rotation speed of the radiator fan 94a and the rotation speed of the oil cooler fan 97a to rotation speeds that differ by at least a predetermined difference simply by setting the target rotation speeds using the storage tables DT1 and DT2, so that the whine noise can be easily prevented without performing any determination control regarding the difference in rotation speed between these two fans.

[0076] 13, the fan control unit 120b may use a control map CM3. For example, the control map CM3 has the same characteristics as the control map CM2 when the hydraulic oil temperature OT is below 70°C, but has different characteristics from the control map CM2 when the hydraulic oil temperature OT is 70°C or higher. Specifically, if the hydraulic oil temperature OT detected by the oil temperature detection unit 127 is 70°C≦OT<90°C, the fan control unit 120b rotates the fan so as to continuously increase the second target rotation speed as the hydraulic oil temperature OT increases. For the temperature category "70°C≦OT<90°C" of the oil cooler 97, which includes a second target rotation speed (2200 rpm) that is higher than the first target rotation speed (2000 rpm) indicated by "70°C≦RT," the highest temperature category among the multiple temperature categories of the radiator 94, the fan control section 120b continuously increases the second target rotation speed as the detected temperature of the oil temperature detection section 127 increases, based on the memory table DT3 (see FIG. 14) pre-stored in the memory section 121.

[0077] Instead of storing memory table DT1 and memory table DT2 (or memory table DT3), memory unit 121 may also store in advance a first arithmetic expression (arithmetic expression) in which a first target rotation speed is predefined for each of a plurality of temperature ranges of radiator 94 (first cooling target), and a second arithmetic expression (arithmetic expression) in which a second target rotation speed that is a predetermined difference or more from the first target rotation speed is predefined for each of a plurality of temperature ranges of oil cooler 97 (second cooling target).

[0078] The slewing work machine 1 also has an alarm device 124 that is installed around the driver's seat 8 and that notifies the worker or manager. The alarm device 124 has a display device 124a, such as a monitor, that displays images, and an audio output device 124b (speaker) that notifies by voice. The alarm device 124 notifies the remaining capacity of the multiple batteries 90a calculated by the BMU 123. The alarm device 124 also notifies the battery unit 90 of the charging state, such as that charging is in progress, and that the radiator fan 94a and oil cooler fan 97a are operating.

[0079] Furthermore, when the driving of the working device 20 is prohibited or restricted, the battery control unit 120a charges the battery unit if the worker issues a charging start instruction to the selector 122.

[0080] Furthermore, when the BMU 123 detects the state of charge (charging) of the battery unit 90, the fan control unit 120b rotates the radiator fan 94a at a predetermined first specified rotation speed (e.g., 800 rpm) and rotates the oil cooler fan 97a at a predetermined second specified rotation speed (e.g., 600 rpm) that is equal to or greater than a predetermined difference (e.g., 200 rpm) from the first specified rotation speed. Specifically, when the BMU 123 detects the state of charge of the battery unit 90, if the temperature of the battery unit 90 detected by the BMU 123 is equal to or greater than a set temperature, the control device 120 rotates the radiator fan 94a at the first specified rotation speed (e.g., 800 rpm) and rotates the oil cooler fan 97a at the second specified rotation speed (e.g., 600 rpm), and does not drive the radiator fan 94a and the oil cooler fan 97a if the temperature of the battery unit 90 is less than the set temperature. The first and second specified rotation speeds are lower than the first target rotation speed of the radiator fan 94a and the second target rotation speed of the oil cooler fan 97a when the battery unit 90 is in a discharging state (during battery output).

[0081] The control process by the fan control unit 120b will be described below with reference to FIG. 18. FIG. 18 is a flowchart showing the control process for the radiator fan and the oil cooler fan. First, the fan control unit 120b determines whether the BMU 123 has detected the charging state (charging) of the battery unit 90 (S11). If the battery unit 90 is charging (charging) (S11, Yes), the fan control unit 120b determines whether the temperature of the battery unit 90 detected by the BMU 123 is equal to or higher than a set temperature (S12). If the temperature of the battery unit 90 is equal to or higher than the set temperature (S12, Yes), the fan control unit 120b drives the radiator fan 94a at a first specified rotation speed (e.g., 800 rpm) and drives the oil cooler fan 97a at a second specified rotation speed (e.g., 600 rpm) (S13). Note that in S13, only one of the radiator fan 94a and the oil cooler fan 97a may be driven.

[0082] In S12, if the temperature of the battery unit 90 is not equal to or higher than the set temperature (S12, No), that is, if the temperature of the battery unit 90 is lower than the set temperature, the fan control unit 120b does not drive the radiator fan 94a and the oil cooler fan 97a (S14).

[0083] If the fan control unit 120b determines in S11 that the battery unit 90 is not in a charged state (charging) (S11, No), it determines whether the battery unit 90 is in a discharged state (in use) (S15). If the battery unit 90 is in a discharged state (in use) (S15, Yes), the fan control unit 120b drives the oil cooler fan 97a at a second target rotation speed based on the hydraulic oil temperature OT detected by the oil temperature detection unit 127 and the storage table DT2 (or storage table DT3) stored in the storage unit 121 (S16). The fan control unit 120b drives the radiator fan 94a at a first target rotation speed based on the coolant temperature RT detected by the water temperature detection unit 126 and the storage table DT1 stored in the storage unit 121 (S17).

[0084] After S13, S14, or S17, the fan control unit 120b returns to the process of S11.

[0085] In S15, if the fan control unit 120b determines that the battery unit 90 is not in a discharging state (not in use) (S15, No), the process ends.

[0086] The above-mentioned rotating work machine 1 comprises a radiator fan 94a, an oil cooler fan 97a, a temperature detection unit TD that detects the temperature of the object to be cooled, a memory unit 121 that stores first data that defines the correspondence between the detected temperature of the temperature detection unit TD and a first target rotation speed that is the target rotation speed of the radiator fan 94a, and second data that defines the correspondence between the detected temperature of the temperature detection unit TD and a second target rotation speed that is the target rotation speed of the oil cooler fan 97a, and a control device 120 that controls the rotation speed of the radiator fan 94a to the first target rotation speed that corresponds to the detected temperature of the temperature detection unit TD and controls the rotation speed of the oil cooler fan 97a to the second target rotation speed that corresponds to the detected temperature of the temperature detection unit TD, and the second target rotation speed is set so that the difference between the second target rotation speed and the first target rotation speed is greater than a predetermined difference regardless of the detected temperature of the temperature detection unit TD.

[0087] According to this configuration, the control device 120 does not need to determine the difference between the target rotation speeds, and rotates the radiator fan 94a at a first target rotation speed and the oil cooler fan 97a at a second target rotation speed that is equal to or greater than a predetermined difference from the first target rotation speed, thereby making it possible to prevent whirring noise with simple fan control.

[0088] In addition, the radiator fan 94a (first cooling fan) is configured to cool the radiator 94 (first cooling target), and the oil cooler fan 97a (second cooling fan) is configured to cool an oil cooler 97 (second cooling target) different from the radiator 94. The temperature detection unit TD includes a water temperature detection unit 126 that detects the temperature RT of the cooling water in the radiator 94, and an oil temperature detection unit 127 that detects the temperature OT of the hydraulic oil in the oil cooler fan 97a. The first data defines the correspondence between the temperature detected by the water temperature detection unit 126 and the first target rotation speed, and the second data defines the correspondence between the temperature detected by the oil temperature detection unit 127 and the second target rotation speed.

[0089] This configuration eliminates the need for the control device 120 to determine whether the difference between the target rotation speeds of the radiator fan 94a and the oil cooler fan 97a is less than a predetermined difference. Furthermore, if the control device 120 determines that the difference is less than the predetermined difference, it eliminates the need for control to change the target rotation speeds of the radiator fan 94a and the oil cooler fan 97a so that the target rotation speeds of the radiator fan 94a and the oil cooler fan 97a are equal to or greater than the target rotation speeds and so that the difference between the target rotation speeds of the radiator fan 94a and the oil cooler fan 97a is equal to or greater than the predetermined difference. This simplifies fan control. Furthermore, the same fan can be used for the radiator fan 94a and the oil cooler fan 97a, allowing for component sharing and reducing costs. Furthermore, because the fan rotation speeds are controlled independently of each other, they are not affected by the operation of other fans, resulting in stable control.

[0090] Moreover, the first data is a memory table DT1 or an arithmetic formula in which a first target rotation speed is predefined for each of a plurality of temperature divisions of the radiator 94, and the second data is a memory table DT2 (or DT3) or an arithmetic formula in which a second target rotation speed is predefined for each of a plurality of temperature divisions of the oil cooler 97, and the control device 120 identifies the temperature division to which the detected temperature of the water temperature detection unit 126 belongs among the plurality of temperature divisions of the radiator 94, rotates the radiator fan 94a at the first target rotation speed corresponding to this identified temperature division, and identifies the temperature division to which the detected temperature of the oil temperature detection unit 127 belongs among the plurality of temperature divisions of the oil cooler 97, and rotates the oil cooler fan 97a at the second target rotation speed corresponding to this identified temperature division.

[0091] According to this configuration, the control device 120 simply identifies the first target rotation speed indicated by the temperature category to which the temperature detected by the water temperature detection device 126 belongs, and identifies the second target rotation speed indicated by the temperature category to which the temperature detected by the oil temperature detection device 127 belongs, based on the storage tables DT1, DT2 (or DT3) or an arithmetic expression. Furthermore, since the first target rotation speed and the second target rotation speed have a relationship that is equal to or greater than a predetermined difference, the control device 120 simply rotates the radiator fan 94a at the identified first target rotation speed and the oil cooler fan 97a at the identified second target rotation speed. This allows for simple fan control.

[0092] In addition, the second data is defined so that for the temperature category of the oil cooler 97 to which the second target rotation speed, which is greater than the maximum value of the first target rotation speed, belongs, the second target rotation speed is continuously increased as the detected temperature of the oil temperature detection unit 127 increases.

[0093] According to this configuration, for the temperature category of the oil cooler 97 to which the second target rotation speed belongs, which is higher than the first target rotation speed indicated by the highest temperature category among the multiple temperature categories of the radiator 94, the second target rotation speed is continuously increased as the temperature detected by the oil temperature detection unit 127 increases. Therefore, it is possible to effectively cool the oil cooler 97 while suppressing a sudden increase in power consumption and noise, and also to prevent the generation of a humming noise.

[0094] The control device 120 also includes a battery unit 90 and a BMU 123 that detects whether the battery unit 90 is in a charged or discharged state, and when the BMU 123 detects the charged state of the battery unit 90, the control device 120 rotates the radiator fan 94a at a predetermined first specified rotation speed and rotates the oil cooler fan 97a at a predetermined second specified rotation speed that is equal to or greater than a predetermined difference from the first specified rotation speed.

[0095] According to this configuration, when the battery unit 90 is in a charged state, the radiator fan 94a is rotated at a first specified rotation speed, and the oil cooler fan 97a is rotated at a second specified rotation speed that is equal to or greater than a predetermined difference from the first specified rotation speed. This eliminates the need to determine the difference between the target rotation speeds, making it possible to prevent a whirring noise with simple fan control when the battery unit 90 is in a charged state. Furthermore, when the battery unit 90 is in a charged state, the radiator 94 and the oil cooler 97 can be cooled, and the radiator fan 94a and the oil cooler fan 97a can also be used as battery fans, allowing air around the battery unit 90 to be exhausted to the outside, thereby cooling the battery unit 90. In other words, when the battery unit 90 is in a charged state, the battery unit 90, the radiator 94, and the oil cooler 97 can be cooled.

[0096] The control device 120 is also provided with a BMU 123 that detects the temperature of the battery unit 90. When the BMU 123 detects the state of charge of the battery unit 90, if the temperature of the battery unit 90 detected by the BMU 123 is equal to or higher than a set temperature, the control device 120 rotates the radiator fan 94a at a predetermined first specified rotation speed and rotates the oil cooler fan 97a at a predetermined second specified rotation speed that is equal to or higher than a predetermined difference from the first specified rotation speed; if the temperature of the battery unit 90 is lower than the set temperature, the control device 120 does not drive the radiator fan 94a and the oil cooler fan 97a.

[0097] According to this configuration, the battery unit 90, the radiator 94, and the oil cooler 97 can be appropriately cooled according to the temperature of the battery unit 90 in a charged state.

[0098] It also includes a cooling unit CU that is an integrated unit of a frame body 98, a radiator fan 94a and an oil cooler fan 97a that are mounted side by side on one side of the frame body 98, and a shroud 110 that surrounds the radiator fan 94a and the oil cooler fan 97a.

[0099] This configuration can prevent the radiator fan 94a and oil cooler fan 97a of the cooling unit CU from generating a humming noise.

[0100] The shroud 110 also includes a first elastic support 113 that supports the radiator fan 94a and a second elastic support 114 that supports the oil cooler fan 97a. With this configuration, the vibration of the radiator fan 94a is reduced by the first elastic support 113, thereby reducing the vibration noise of the radiator fan 94a. The vibration of the oil cooler fan 97a is also reduced by the second elastic support 114, thereby reducing the vibration noise of the oil cooler fan 97a. This further reduces the humming noise caused by the radiator fan 94a and the oil cooler fan 97a.

[0101] The shroud 110 is a rectangular tube that surrounds both the radiator fan 94a and the oil cooler fan 97a, and includes a fixed portion 111 having an upper side portion 111a, a left side portion 111b, a lower side portion 111d, and a right side portion 111c, and a guide portion 112 that extends outward from the fixed portion 111 toward the exhaust side and guides the cooling air generated by driving the radiator fan 94a and the cooling air generated by driving the oil cooler fan 97a, the lower side portion 111d having a first notch portion 115 at a location that supports the radiator fan 94a and a second notch portion 116 at a location that supports the oil cooler fan 97a, a first elastic support member 113 provided in the first notch portion 115, and a second elastic support member 114 provided in the second notch portion 116. With this configuration, compared to when the first elastic support 113 and the second elastic support 114 are provided on the lower side portion 111d, the increase in the vertical dimension of the fixing portion 111 can be minimized, and the fixing portion 111 can be minimized by bringing the lower side portion 111d close enough to come into contact with the lower parts of the cases of the radiator fan 94a and the oil cooler fan 97a. Furthermore, the vibration noise of the radiator fan 94a and the oil cooler fan 97a can be reduced. Therefore, the humming noise caused by the radiator fan 94a and the oil cooler fan 97a can be further prevented.

[0102] The system also includes a hydraulically driven working implement 20 and a water-cooling path 95 that circulates cooling water to cool the equipment to be cooled, with the first cooling fan being a radiator fan 94a and the second cooling fan being an oil cooler fan 97a that cools the hydraulic oil used to drive the working implement 20. This configuration can prevent the radiator fan 94a and the oil cooler fan 97a from making a humming noise.

[0103] <First Modification> A first modified example will be described. As shown in FIG. 4, the revolving work machine 1 may be provided with a detector 128, such as a detection switch, that detects whether the inspection door 76 is open or closed. The detector 128 outputs a detection signal indicating the open state to the control device 120 when the inspection door 76 is open, and outputs a detection signal indicating the closed state when the inspection door 76 is closed. The control device 120 may control at least one of the electric motor 91, the radiator fan 94a, and the oil cooler fan 97a based on the detection signal from the detector 128. In the first modified example, when the detector 128 detects that the inspection door 76 is open, the control device 120 drives the electric motor 91 at a rotation speed lower than the rotation speed when the inspection door 76 is closed. Furthermore, when the detector 128 detects that the inspection door 76 is open, the control device 120 stops the rotation of the radiator fan 94a and the oil cooler fan 97a.

[0104] The control process by the fan control unit 120b (control device 120) will be described below with reference to Fig. 19. Fig. 19 is a flowchart showing the control process of the first modified example. First, the fan control unit 120b determines whether or not the inspection door 76 is in the open state based on the detection signal from the detection unit 128 (S41). If the detection signal indicates a closed state, the fan control unit 120b determines that the inspection door 76 is in the closed state (S41, No), and determines whether or not the BMU 123 has detected the charging state (charging) of the battery unit 90 (S42).

[0105] If the battery unit 90 is in a charging state (charging) (S42, Yes), the fan control unit 120b determines whether the temperature of the battery unit 90 detected by the BMU 123 is equal to or higher than a set temperature (S43). If the temperature of the battery unit 90 is equal to or higher than the set temperature (S43, Yes), the fan control unit 120b drives the radiator fan 94a and the oil cooler fan 97a at first and second specified rotation speeds (S44).

[0106] In S43, if the temperature of the battery unit 90 is not equal to or higher than the set temperature (S43, No), that is, if the temperature of the battery unit 90 is lower than the set temperature, the fan control unit 120b does not drive the radiator fan 94a and the oil cooler fan 97a (S27).

[0107] If it is determined in S42 that the battery unit 90 is not in a charged state (charging) (S42, No), the fan control unit 120b determines whether the battery unit 90 is in a discharged state (in use) (S46). If the battery unit 90 is in a discharged state (in use) (S46, Yes), the fan control unit 120b drives the oil cooler fan 97a at a second target rotation speed based on the hydraulic oil temperature OT detected by the oil temperature detection unit 127 and the storage table DT2 (or storage table DT3) stored in the storage unit 121 (S47). The fan control unit 120b drives the radiator fan 94a at a first target rotation speed based on the coolant temperature RT detected by the water temperature detection unit 126 and the storage table DT1 stored in the storage unit 121 (S48).

[0108] In S41, if the detection signal indicates an open state, the fan control unit 120b determines that the inspection door 76 is open (S41, Yes), and determines whether the electric motor 91 is rotating (S49). For example, if the rotation speed control unit 120c has set the rotation speed of the electric motor 91 to a value other than "zero," the fan control unit 120b determines that the electric motor 91 is rotating (S49, Yes). If the fan control unit 120b determines that the electric motor 91 is rotating (S49, Yes), it causes the electric motor 91 to rotate at a rotation speed lower than normal (for example, 500 rpm) (S50). If the fan control unit 120b determines that the electric motor 91 is not rotating (S49, No), or after the processing of S50, the fan control unit 120b proceeds to the processing of S45.

[0109] After S44, S45, or S48, the fan control unit 120b returns to the process of S41.

[0110] In S46, if the fan control unit 120b determines that the battery unit 90 is not in a discharging state (not in use) (S46, No), the fan control unit 120b ends this process.

[0111] In the rotating work machine 1 of the first modified example, when the detector 128 detects that the inspection door 76 is open, the control device 120 drives the electric motor 91 at a lower rotation speed than when the inspection door 76 is closed. With this configuration, when the inspection door 76 is open, the power consumption of the electric motor 91 can be reduced compared to when the inspection door 76 is closed, allowing for efficient use of electrical energy.

[0112] Furthermore, in the rotating work machine 1, the control device 120 stops the rotation of the radiator fan 94a and the oil cooler fan 97a when the detection unit 128 detects that the inspection door 76 is open. With this configuration, inspection can be performed with the rotation of the radiator fan 94a and the oil cooler fan 97a stopped, and the power consumption of the radiator fan 94a and the oil cooler fan 97a can be reduced to zero, allowing for efficient use of electrical energy.

[0113] <Second Modification> A second modified example will be described. The rotating work machine 1 of the second modified example is capable of changing the predetermined difference (for example, 200 rpm) between the first target rotation speed of the radiator fan 94a and the second target rotation speed of the oil cooler fan 97a. FIG. 20 is a diagram showing an example of a screen for changing the predetermined difference. FIG. 21 shows each memory table DT1 after the change stored in the memory unit. 1, DT21, and DT31. Specifically, when a setting change button displayed on the display device 124a is operated, the control device 120 causes the display device 124a to display a predetermined difference change screen shown in FIG. 20. As shown in FIG. 20, the display device 124a displays the predetermined difference change screen, which includes a display of the currently set predetermined difference value (e.g., 200 rpm), a message saying "Please input the predetermined difference," and a reception unit 125 that receives an instruction to change the predetermined difference to a value greater than the default predetermined difference (e.g., 200 rpm). The reception unit 125 accepts the input value if the input value exceeds the default predetermined difference (e.g., 200 rpm) and is within an upper limit value (e.g., 300 rpm). On the other hand, the reception unit 125 does not accept the input value if the input value is less than the default value (e.g., 200 rpm) or exceeds the upper limit value (e.g., 300 rpm). Here, it is assumed that 220 rpm, for example, is input to and accepted by the reception unit 125 as the changed predetermined difference.

[0114] The fan control unit 120b changes the first target rotation speed and the second target rotation speed to values ​​having the changed predetermined difference (e.g., 220 rpm) received by the receiving unit 125, and stores the changed DT11 (see FIG. 21) in the memory unit 121. The fan control unit 120b uses the second target rotation speed (e.g., 1000 rpm) in the hydraulic oil temperature range of 40°C≦OT<50°C as a reference, and changes the second target rotation speed and the first target rotation speed other than this reference second target rotation speed (e.g., 1000 rpm) to values ​​having the changed predetermined difference (e.g., 220 rpm), thereby creating the changed memory tables DT11 and DT21.

[0115] 21, the changed storage table DT11 is a table that stores a relationship between a coolant temperature category and a first target rotation speed of the radiator fan 94a that has been changed based on a changed predetermined difference (e.g., 220 rpm) in a predetermined correspondence. Specifically, the storage table DT11 associates the coolant temperature category "50°C≦RT<60°C" with the changed first target rotation speed (e.g., "1220 rpm"), the coolant temperature category "60°C≦RT<70°C" with the changed first target rotation speed (e.g., "1660 rpm"), and the coolant temperature category "70°C≦RT" with the changed first target rotation speed (e.g., "2100 rpm"). Note that the changed storage table DT11 does not change the coolant temperature category "0°C≦RT<50°C" because the first target rotation speed is "0 rpm."

[0116] 21, the changed storage table DT21 is a table that stores a relationship between the temperature category of the hydraulic oil and the second target rotation speed of the oil cooler fan 97a that has been changed based on the changed predetermined difference (for example, 220 rpm) in a predetermined correspondence. Specifically, in the changed storage table DT21, the hydraulic oil temperature category "50°C≦OT<60°C" is associated with the changed second target rotation speed (for example, "1440 rpm"), the hydraulic oil temperature category "60°C≦OT<70°C" is associated with the changed second target rotation speed (for example, "1880 rpm"), and the hydraulic oil temperature category "70°C≦OT" is associated with the changed second target rotation speed (for example, "2320 rpm"). In addition, in the changed memory table DT21, the second target rotation speed is "0 rpm" for the hydraulic oil temperature category "0°C≦OT<40°C", so there is no change, and the second target rotation speed (for example, "1000 rpm") is used as the basis for the hydraulic oil temperature category "40°C≦OT<50°C", so there is no change.

[0117] Although the second target rotation speed (e.g., 1000 rpm) in the hydraulic oil temperature range "40°C≦OT<50°C" in the storage table DT21 is used as the reference, the present invention is not limited to this. For example, the first target rotation speed (e.g., 1220 rpm) in the cooling water temperature range "50°C≦RT<60°C" in the storage table DT11 may be used as the reference.

[0118] As shown in FIG. 21, the fan control unit 120b determines the first target rotation speed (i.e., the changed first target rotation speed) based on the detected temperature of the water temperature detection unit 126 and the changed memory table DT11, and determines the second target rotation speed (i.e., the changed second target rotation speed) based on the detected temperature of the oil temperature detection unit 127 and the changed memory table DT21.

[0119] In addition, the fan control unit 120b may store in the memory unit 121 the modified arithmetic equations in which the first target rotation speed and the second target rotation speed are changed to values ​​having a predetermined difference (e.g., 220 rpm) received by the receiving unit 125, and determine the first target rotation speed based on the detected temperature of the water temperature detection unit 126 and the modified arithmetic equation, and determine the second target rotation speed based on the detected temperature of the oil temperature detection unit 127 and the modified arithmetic equation.

[0120] Furthermore, the fan control unit 120b changes the first specified rotation speed (e.g., 800 rpm) to a changed first specified rotation speed (e.g., 780 rpm) that has a changed predetermined difference (e.g., 220 rpm), and changes the changed second specified rotation speed (e.g., 560 rpm) that has a changed predetermined difference (e.g., 220 rpm) from the changed first specified rotation speed (e.g., 780 rpm). Therefore, when the BMU 123 detects the charging state (charging) of the battery unit 90, the fan control unit 120b rotates the radiator fan 94a at the predetermined changed first specified rotation speed (e.g., 780 rpm) and rotates the oil cooler fan 97a at the predetermined changed second specified rotation speed (e.g., 560 rpm).

[0121] In the above-described second modified example of the slewing work machine 1, the control device 120 changes at least one of the memory table DT1 (first data) and the memory table DT2 (second data) stored in the memory unit 121 in accordance with a change instruction received by the receiving unit 125, so that humming noise can be flexibly prevented.

[0122] The control device 120 also has a reception unit 125 that receives an instruction to change the predetermined difference to a value greater than the default value of the predetermined difference (for example, 200 rpm), and the control device 120 stores in the memory unit 121 the changed memory tables DT11, DT21 (or DT31) or changed arithmetic formula in which the first target rotation speed and the second target rotation speed have been changed to values ​​having the changed predetermined difference received by the reception unit 125, and determines the first target rotation speed based on the detected temperature of the water temperature detection unit 126 and the changed memory tables DT11, DT21 (or DT31) or changed arithmetic formula, and determines the second target rotation speed based on the detected temperature of the oil temperature detection unit 127 and the changed memory tables DT11, DT21 (or DT31) or changed arithmetic formula.

[0123] According to the second modified example, the predetermined difference can be changed to a value greater than the predetermined difference (e.g., 200 rpm) (e.g., 220 rpm), thereby preventing beat noise that could not be prevented with the predetermined difference (e.g., 200 rpm). Furthermore, because the predetermined difference is changed to a value greater than the predetermined difference (e.g., 200 rpm) (e.g., 220 rpm), it is possible to prevent the predetermined difference from being changed to a value less than the predetermined difference (e.g., 200 rpm), thereby preventing beat noise from being generated due to an erroneous change in the predetermined difference.

[0124] In the above-described embodiment and modified examples, an example has been described in which the present invention is applied to a swing work machine such as a backhoe, but the application of the present invention is not limited to this, and the present invention may be applied to other construction machines such as wheel loaders, compact track loaders, and skid steer loaders, as well as agricultural machines such as tractors, combine harvesters, rice transplanters, and lawn mowers. In other words, the present invention can be applied to a variety of work machines.

[0125] In the above-described embodiment and modified examples, the first object to be cooled is the radiator 94 and the second object to be cooled is the oil cooler 97, but this is not limiting. For example, the first object to be cooled may be the oil cooler 97 and the second object to be cooled may be the radiator 94, or may be something other than these. Furthermore, the number of objects to be cooled may be three or more.

[0126] In the above-described embodiment and modified example, the first cooling fan is the radiator fan 94a and the second cooling fan is the oil cooler fan 97a. However, this is not limiting. For example, the first cooling fan may be the oil cooler fan 97a and the second cooling fan may be the radiator fan 94a, or another fan may be used. Furthermore, three or more cooling fans may be set to predetermined target rotation speeds that are greater than or equal to a predetermined difference. Furthermore, the first cooling fan and the second cooling fan may be configured to cool a common cooling target, and both cooling fans may be driven at rotation speeds that are greater than or equal to a predetermined difference. Even in this case, the control device 120 does not need to determine the difference between the target rotation speeds of the two cooling fans, and can prevent whine noise with simple fan control. Furthermore, the first cooling fan and the second cooling fan may be attached to the same frame or different frames.

[0127] Although the present invention has been described above, the embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0128] 1. Rotating work machine 2 Swivel table 20 Work equipment 30 Oil cooler 30a Oil cooler fan 35 Support frame 70 Exterior cover 73a Air intake 76 Inspection door 77 Exhaust section 90 Battery Unit 91 Electric motor 92b inverter 94 Radiator (first cooling target) 94c Water supply section 94a Radiator fan (first cooling fan) 97 Oil cooler (second cooling target) 97a Oil cooler fan (second cooling fan) 98 Frame 110 Shroud 111 Fixed part 111a Upper edge 111b left side 111d bottom 111c Right side 112 Information Department 112a Downward slope extension 112b Right side bending extension 113 First elastic support 114 Second elastic support 115 1st notch 116 Second notch 120 Control device 121 Storage section 123 BMU (detection unit, temperature detection unit) 126 water temperature detection unit (first temperature detection unit) 127 Oil temperature detection unit (second temperature detection unit) 128 Detection unit CU Cooling Unit DT1, DT2, DT3 storage tables DT11, DT21, DT31 Memory table after change P Hydraulic pump

Claims

1. a first cooling fan; a second cooling fan; a temperature detection unit that detects the temperature of a cooling object, which is cooling water or hydraulic oil, cooled by the cooling device; a storage unit configured to store first data defining a correspondence relationship between the temperature detected by the temperature detection unit and a first target rotation speed that is a target rotation speed of the first cooling fan, and second data defining a correspondence relationship between the temperature detected by the temperature detection unit and a second target rotation speed that is a target rotation speed of the second cooling fan; a control device that controls the rotation speed of the first cooling fan to the first target rotation speed corresponding to the temperature detected by the temperature detection unit, and controls the rotation speed of the second cooling fan to the second target rotation speed corresponding to the temperature detected by the temperature detection unit, the first data defines the first target rotation speed for each of a plurality of first temperature ranges, The second data defines the second target rotation speed for each of a plurality of second temperature divisions, and the second target rotation speeds corresponding to all of the second temperature divisions are set so that the difference between the second target rotation speeds corresponding to all of the first temperature divisions is greater than a predetermined difference, except in the case where the second target rotation speed is zero.

2. The cooling device includes a radiator that cools cooling water and an oil cooler that cools hydraulic oil, the first cooling fan is provided to cool the radiator, and the second cooling fan is provided to cool the oil cooler, The temperature detection unit includes: a first temperature detection unit that detects the temperature of the cooling water cooled by the radiator; a second temperature detection unit that detects the temperature of the hydraulic oil cooled by the oil cooler, 2. The work machine according to claim 1, wherein the first data defines a correspondence relationship between the detected temperature of the first temperature detection unit and the first target rotation speed, and the second data defines a correspondence relationship between the detected temperature of the second temperature detection unit and the second target rotation speed.

3. The first data is a storage table or an arithmetic expression in which a first target rotation speed is predefined for each of the plurality of first temperature ranges of the radiator, and the second data is a data for the oil cooler. a storage table or an arithmetic expression in which the second target rotation speed is predefined for each of the plurality of second temperature ranges of the controller, 3. The work machine according to claim 2, wherein the control device identifies the first temperature category to which the detected temperature of the first temperature detection unit belongs among the plurality of first temperature categories of the radiator, and rotates the first cooling fan at the first target rotation speed corresponding to the identified first temperature category, and identifies the second temperature category to which the detected temperature of the second temperature detection unit belongs among the plurality of second temperature categories of the oil cooler, and rotates the second cooling fan at the second target rotation speed corresponding to the identified second temperature category.

4. 4. The work machine according to claim 3, wherein the second data is defined so that, for the second temperature category of the oil cooler to which the second target rotation speed belongs, which is greater than the maximum value of the first target rotation speed, the second target rotation speed is continuously increased as the detected temperature of the second temperature detection unit increases.

5. 2. The work machine according to claim 1, wherein the first cooling fan and the second cooling fan are provided to cool the radiator or the oil cooler.

6. A battery unit; a detection unit that detects whether the battery unit is in a charging state or a discharging state, The control device is configured to rotate the first cooling fan at a predetermined first specified rotation speed and rotate the second cooling fan at a predetermined second specified rotation speed that is equal to or greater than a predetermined difference from the first specified rotation speed when the detection unit detects the charging state of the battery unit.

7. a temperature detection unit that detects the temperature of the battery unit; 7. The work machine according to claim 6, wherein, when the detection unit detects the state of charge of the battery unit, if the temperature of the battery unit detected by the temperature detection unit is equal to or higher than a set temperature, the control device rotates the first cooling fan at the first specified rotation speed and rotates the second cooling fan at the second specified rotation speed, and does not drive the first cooling fan and the second cooling fan if the temperature of the battery unit is lower than the set temperature.

8. A work machine as described in any one of claims 1 to 5, comprising a cooling unit that is an integrated unit comprising a frame body, the first cooling fan and the second cooling fan attached side by side to one side of the frame body, and a shroud that surrounds the first cooling fan and the second cooling fan.

9. 9. The work machine according to claim 8, wherein the shroud includes a first elastic support member that supports the first cooling fan and a second elastic support member that supports the second cooling fan.

10. the shroud is a rectangular tube surrounding both the first cooling fan and the second cooling fan, and includes a fixed portion having an upper side, a left side, a lower side, and a right side, and a guide portion extending from the fixed portion outward toward the exhaust side and guiding cooling air generated by driving the first cooling fan and cooling air generated by driving the second cooling fan, the lower side portion has a first notch portion at a location where the first cooling fan is supported and a second notch portion at a location where the second cooling fan is supported; The work machine according to claim 9, wherein the first elastic support body is provided in the first notch portion, and the second elastic support body is provided in the second notch portion.

11. a receiving unit that receives an instruction to change the predetermined difference, The work machine according to any one of claims 1 to 5, wherein the control device changes at least one of the first data and the second data stored in the memory unit in accordance with a change instruction received by the reception unit.

12. a hydraulically driven working device; a water cooling path that circulates cooling water to cool the equipment to be cooled, the first cooling fan is a radiator fan for cooling the coolant, 6. The work machine according to claim 1, wherein the second cooling fan is an oil cooler fan that cools hydraulic oil for driving the work device.

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