JP2011020637A - Construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent entering of foreign matter from the outside and to appropriately air-cool a power storage means. <P>SOLUTION: Metallic meshes 72 and 71 are provided in an opening part 60A and an opening part 60B of a house part, respectively, to prevent entering of foreign matter from the opening parts 60A and 60B of the house part into a capacitor box 80. An insulation 76 is provided in a connecting part for connecting the opening part 60A and an intake duct 40 and an insulation 75 is provided in a connecting part for connecting the opening part 60B and an exhaust duct 39, and thereby heat generated in other device such as an engine stored in the house part is prevented from being transmitted to a capacitor 19 in the capacitor box 80 through the connecting part, and the capacitor 19 can be appropriately air-cooled by a cooling air flow passage formed in a casing by a fan 43, while suppressing a temperature rise of the capacitor 19. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a construction machine.

  2. Description of the Related Art Conventionally, a hybrid construction machine has been developed that includes a so-called hybrid system that includes a generator that generates electric power by driving an engine and assists the driving of the engine by using electric power generated by the generator. Such a construction machine is provided with power storage means for storing power generated by driving the engine. Specifically, for example, a capacitor module using a large-capacity capacitor is used as this power storage means, but in a construction machine that repeatedly drives and decelerates, the load on the capacitor is very large and the calorific value of the capacitor Since deterioration due to increase is fast, various techniques for suppressing deterioration by cooling the capacitor have been studied. For example, in Patent Document 1, a cooling flow path for flowing cooling water is provided on a plate to which the capacitor is attached and fixed. Thus, a configuration for cooling the capacitor is shown.

JP 2008-187047 A

  By the way, as a method for cooling power storage means such as capacitors, a method by air cooling can be used in addition to the method by water cooling described in Patent Document 1. As an example of a method for air-cooling power storage means in a construction machine, an opening is formed in the body of the construction machine, and a cooling air flow path is formed in the body by sucking outside air by a cooling means such as a fan in the body. Generally, a method of arranging power storage means in the air flow path is used.

  However, since construction machines are often left outside during operation, opening an opening in the body makes it easier for organisms such as insects and birds and foreign objects such as dust to enter the body. If the foreign matter enters, there is a risk of damage to the power storage means and the cooling means. In particular, when a construction machine is left outside for a long time, for example, when a bird builds a nest in the body, it becomes difficult to remove them.

  The present invention has been made in view of the above, and an object of the present invention is to provide a construction machine that can prevent the entry of foreign matter from the outside and suitably cool the power storage means with air.

  To achieve the above object, a construction machine according to the present invention is driven by an engine, power generation means for generating power by driving the engine, power storage means for storing power generated by the power generation means, and power from the power storage means. In a construction machine having an electric drive means for carrying out, a casing having a vent and containing a power storage means, an opening having one end communicating with the outside and the other end communicating with the vent, and containing the casing And a cooling means provided in the casing and forming a cooling air passage for allowing outside air to flow as cooling air through the opening of the body and the ventilation hole of the casing. Is provided with a net-like member through which cooling air can be ventilated, and a connecting part that connects the opening of the body and the vent of the casing is provided with a heat insulating member that insulates the connecting part hermetically. Vignetting wherein the are.

  According to the construction machine described above, the net member is provided in the opening of the body, thereby preventing foreign matter from entering the casing through the opening of the body. Furthermore, the connecting portion that connects the opening of the body and the ventilation hole of the casing is provided with a heat insulating member that hermetically insulates the connecting portion, so that other devices such as an engine accommodated in the body can be used. The generated heat is prevented from being transmitted to the power storage means in the casing through the connection between the opening of the body and the ventilation hole of the casing and the temperature rise of the power storage means is suppressed, and is formed in the casing by the cooling means. The power storage means can be suitably air-cooled by the cooling air flow path.

  Here, it is preferable that a louver is provided in each of the opening and the vent, and the louver in the opening and the louver in the vent are inclined in directions opposite to each other along the flow direction of the cooling air. .

  As described above, the louver at the opening and the louver at the vent are inclined in opposite directions along the flow direction of the cooling air, so that rain water from rain or high-pressure washing water from the car wash can Can be prevented from entering.

  Further, at least one of the louver of the opening and the louver of the vent may be configured such that the angle can be adjusted along the flow direction of the cooling air.

  As described above, by adjusting the angle of at least one of the opening louver and the vent louver, for example, the louver angle can be optimized according to changes in the weather and surrounding environment. Can do.

  ADVANTAGE OF THE INVENTION According to this invention, the construction machine which can prevent the penetration | invasion of the foreign material from the outside and can air-cool a electrical storage means suitably is provided.

It is a perspective view showing the appearance of the construction machine concerning one embodiment of the present invention. It is a block diagram which shows internal structures, such as an electric system of the construction machine shown in FIG. 1, and a hydraulic system. It is a circuit diagram which shows the internal structure of the electrical storage means in FIG. It is a perspective view which shows the house part of the turning body in FIG. It is sectional drawing which shows the state which installed the capacitor box of the electrical storage means in the house part. It is the perspective view which looked at the state which opened the door of the right front part of the house part, and the louver in FIG. 5 was exposed from the front right side of the vehicle. It is a block diagram showing internal composition, such as an electric system of a construction machine concerning another embodiment, and a hydraulic system.

  Hereinafter, preferred embodiments of a construction machine according to the present invention will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a perspective view showing an appearance of a construction machine according to an embodiment of the present invention. The construction machine of this embodiment is a so-called hybrid type construction machine, and shows a lifting magnet vehicle as an example.

  As shown in FIG. 1, the lifting magnet vehicle 1 includes a traveling mechanism 2 including an endless track, and a revolving body 4 that is rotatably mounted on an upper portion of the traveling mechanism 2 via a revolving mechanism 3. The revolving body 4 is attached with a boom 5, an arm 6 linked to the tip of the boom 5, and a lifting magnet 7 linked to the tip of the arm 6. The lifting magnet 7 is a facility for attracting and capturing a suspended load G such as a steel material by a magnetic force. The boom 5, arm 6 and lifting magnet 7 are hydraulically driven by a boom cylinder 8, an arm cylinder 9 and a bucket cylinder 10, respectively.

  Further, the revolving body 4 includes a driver's cab 4a for accommodating an operator who operates the position of the lifting magnet 7, the excitation operation and the release operation, and an engine 11 which is a power source for generating hydraulic pressure (see FIG. 2). ) Is housed (house) 4b that houses a power source and the like. The engine 11 is composed of, for example, a diesel engine.

  FIG. 2 is a block diagram showing an internal configuration of the construction machine shown in FIG. 1, such as an electrical system and a hydraulic system, and the configuration is referred to as a so-called parallel system. In FIG. 2, the mechanical power transmission system is indicated by a double line, the hydraulic system is indicated by a thick solid line, the steering system is indicated by a broken line, and the electrical system is indicated by a thin solid line. FIG. 3 is a diagram showing the internal configuration of the power storage means 120 in FIG.

  As shown in FIG. 2, the lifting magnet vehicle 1 includes a motor generator (power generation means) 12 and a transmission 13, and the rotation shafts of the engine 11 and the motor generator 12 are both connected to the input shaft of the transmission 13. Are connected to each other. When the load on the engine 11 is large, the motor generator 12 assists the driving force of the engine 11 by driving the engine 11 as a work element, and the driving force of the motor generator 12 is used as the output shaft of the transmission 13. And then transmitted to the main pump 14. On the other hand, when the load on the engine 11 is small, the driving force of the engine 11 is transmitted to the motor generator 12 via the transmission 13 so that the motor generator 12 generates power.

  The motor generator 12 is configured by, for example, an IPM (Interior Permanent Magnetic) motor in which a magnet is embedded in the rotor. Switching between driving and power generation of the motor generator 12 is performed according to the load of the engine 11 and the like by the controller 30 that controls driving of the electric system in the lifting magnet vehicle 1.

  A main pump 14 and a pilot pump 15 are connected to the output shaft of the transmission 13, and a control valve 17 is connected to the main pump 14 via a high-pressure hydraulic line 16. The control valve 17 is a device that controls the hydraulic system in the lifting magnet vehicle 1. In addition to the left and right hydraulic motors 2a and 2b for driving the traveling mechanism 2 shown in FIG. 1, a boom cylinder 8, an arm cylinder 9 and a bucket cylinder 10 are connected to the control valve 17 via a high pressure hydraulic line. The control valve 17 controls the hydraulic pressure supplied to them according to the operation input of the driver.

  The output terminal of the inverter circuit 18 </ b> A is connected to the electrical terminal of the motor generator 12. The power storage means 120 is connected to the input terminal of the inverter circuit 18A. As shown in FIG. 3, the power storage means 120 includes a DC bus 110 that is a DC bus, a step-up / down converter 100, and a capacitor 19. That is, the input terminal of the inverter circuit 18 </ b> A is connected to the input terminal of the buck-boost converter 100 via the DC bus 110. A capacitor 19 is connected to the output terminal of the buck-boost converter 100. Here, the capacitor 19 has a large number of cells. A battery may be used instead of the capacitor.

  Returning to FIG. 2, the inverter circuit 18 </ b> A controls the operation of the motor generator 12 based on a command from the controller 30. That is, when the inverter circuit 18A operates the motor generator 12 in electric (assist) operation, the necessary power is supplied from the capacitor 19 and the step-up / down converter 100 to the motor generator 12 via the DC bus 110. Further, when the motor generator 12 is caused to perform a power generation operation, the electric power generated by the motor generator 12 is charged into the capacitor 19 via the DC bus 110 and the step-up / down converter 100. The switching control between the step-up / step-down operation of the step-up / down converter 100 is performed by the controller 30 based on the DC bus voltage value, the capacitor voltage value, and the capacitor current value. As a result, the DC bus 110 can be maintained in a state of being stored at a predetermined constant voltage value.

  Further, the lifting magnet 7 shown in FIG. 1 is connected to the DC bus 110 of the power storage means 120 via an inverter circuit 20B. The lifting magnet 7 includes an electromagnet that generates a magnetic force for magnetically attracting a metal object, and power is supplied from the DC bus 110 via the inverter circuit 20B. The inverter circuit 20 </ b> B supplies the requested power to the lifting magnet 7 from the DC bus 110 when the electromagnet is turned on based on a command from the controller 30. Further, when the electromagnet is turned off, the regenerated electric power is supplied to the DC bus 110.

  Further, an inverter circuit 20A is connected to the power storage means 120. One end of the inverter circuit 20A is connected to a turning electric motor (AC motor; electric drive means) 21 as a working electric motor, and the other end of the inverter circuit 20A is connected to the DC bus 110 of the power storage means 120. The turning electric motor 21 is a power source of the turning mechanism 3 shown in FIG. A resolver 22, a mechanical brake 23, and a turning speed reducer 24 are connected to the rotating shaft 21 </ b> A of the turning electric motor 21.

  When the turning electric motor 21 performs a power running operation, the rotational force of the rotational driving force of the turning electric motor 21 is amplified by the turning speed reducer 24, and the turning body 4 is subjected to acceleration / deceleration control to perform rotational motion. Further, due to the inertial rotation of the swing body 4, the rotation speed is increased by the swing speed reducer 24 and transmitted to the swing electric motor 21 to generate regenerative power. The turning electric motor 21 is AC driven by the inverter circuit 20A by a PWM (Pulse Width Modulation) control signal. As the turning electric motor 21, for example, a magnet-embedded IPM motor is suitable.

  The resolver 22 is a sensor that detects the rotation position and rotation angle of the rotation shaft 21A of the turning electric motor 21, and mechanically connects to the turning electric motor 21 to detect the rotation angle and rotation direction of the rotation shaft 21A. When the resolver 22 detects the rotation angle of the rotation shaft 21A, the rotation angle and the rotation direction of the turning mechanism 3 are derived. The mechanical brake 23 is a braking device that generates a mechanical braking force, and mechanically stops the rotating shaft 21 </ b> A of the turning electric motor 21 according to a command from the controller 30. The turning speed reducer 24 is a speed reducer that reduces the rotational speed of the rotating shaft 21 </ b> A of the turning electric motor 21 and mechanically transmits it to the turning mechanism 3.

  In addition, since the motor generator 12, the turning motor 21, and the lifting magnet 7 are connected to the DC bus 110 via the inverter circuits 18A, 20A, and 20B, the power generated by the motor generator 12 is lifted. In some cases, the magnet 7 or the turning electric motor 21 may be directly supplied, and in some cases, the electric power regenerated by the lifting magnet 7 may be supplied to the motor generator 12 or the turning electric motor 21. In some cases, the electric power regenerated in step 1 is supplied to the motor generator 12 or the lifting magnet 7.

  An operation device 26 is connected to the pilot pump 15 via a pilot line 25. The operating device 26 is an operating device for operating the turning electric motor 21, the traveling mechanism 2, the boom 5, the arm 6, and the lifting magnet 7, and is operated by an operator. A control valve 17 is connected to the operating device 26 via a hydraulic line 27, and a pressure sensor 29 is connected via a hydraulic line 28. The operating device 26 converts the hydraulic pressure (primary hydraulic pressure) supplied through the pilot line 25 into a hydraulic pressure (secondary hydraulic pressure) corresponding to the operation amount of the operator and outputs the hydraulic pressure. The secondary hydraulic pressure output from the operating device 26 is supplied to the control valve 17 through the hydraulic line 27 and detected by the pressure sensor 29.

  When an operation for turning the turning mechanism 3 is input to the operating device 26, the pressure sensor 29 detects this operation amount as a change in the oil pressure in the hydraulic line 28. The pressure sensor 29 outputs an electrical signal indicating the hydraulic pressure in the hydraulic line 28. This electric signal is input to the controller 30 and used for driving control of the turning electric motor 21.

  The controller 30 constitutes a control circuit in the present embodiment. The controller 30 is configured by an arithmetic processing unit including a CPU and an internal memory, and is realized by the CPU executing a drive control program stored in the internal memory. The power source of the controller 30 is a battery (for example, a 24V on-vehicle battery) different from the capacitor 19. The controller 30 converts a signal representing an operation amount for turning the turning mechanism 3 among signals inputted from the pressure sensor 29 into a speed command, and performs drive control of the turning electric motor 21. Further, the controller 30 is a capacitor by controlling the operation of the motor generator 12 (switching between assist operation and power generation operation), driving control of the lifting magnet 7 (switching between excitation and demagnetization), and driving control of the buck-boost converter 100. 19 charge / discharge control is performed.

  Here, the buck-boost converter 100 in the present embodiment will be described in detail. As shown in FIG. 3, the step-up / step-down converter 100 has a step-up / step-down switching control system, and includes a reactor 101 and transistors 100B and 100C. The transistor 100B is a step-up switching element, and the transistor 100C is a step-down switching element. The transistors 100B and 100C are composed of, for example, an IGBT (Insulated Gate Bipolar Transistor) and are connected in series with each other.

  Specifically, the collector of the transistor 100B and the emitter of the transistor 100C are connected to each other, the emitter of the transistor 100B is connected to the negative terminal of the capacitor 19 and the negative wiring of the DC bus 110, and the collector of the transistor 100C is connected to the DC It is connected to the positive side wiring of the bus 110. Reactor 101 has one end connected to the collector of transistor 100B and the emitter of transistor 100C, and the other end connected to the positive terminal of capacitor 19. A PWM voltage is applied from the controller 30 to the gates of the transistors 100B and 100C.

  Note that a diode 100b, which is a rectifying element, is connected in parallel in the reverse direction between the collector and the emitter of the transistor 100B. Similarly, a diode 100c is connected in parallel in the reverse direction between the collector and emitter of the transistor 100C. A smoothing capacitor 110a is connected in the DC bus 110 between the collector of the transistor 100C and the emitter of the transistor 100B (that is, between the positive side wiring and the negative side wiring of the DC bus 110). The capacitor 110 a smoothes the output voltage from the step-up / down converter 100, the generated voltage from the motor generator 12, and the regenerative voltage from the turning electric motor 21.

  In the buck-boost converter 100 having such a configuration, when supplying DC power from the capacitor 19 to the DC bus 110, a PWM voltage is applied to the gate of the transistor 100B according to a command from the controller 30. Then, the induced electromotive force generated in the reactor 101 when the transistor 100B is turned on / off is transmitted through the diode 100c, and this power is smoothed by the capacitor 110a. When supplying DC power from the DC bus 110 to the capacitor 19, a PWM voltage is applied to the gate of the transistor 100 </ b> C according to a command from the controller 30, and the current output from the transistor 100 </ b> C is smoothed by the reactor 101. Is done.

  Next, the swivel body 4 will be described. FIG. 4 is a perspective view showing the house part (body) 4 b of the revolving structure 4. Hereinafter, in the description of the configuration of the house portion 4b, the front, rear, left and right are based on the lifting magnet vehicle 1 unless otherwise specified. As shown in FIG. 4, the house part 4b is comprised so that it may become substantially U shape in planar view, and it arrange | positions so that the open part which comprises U shape may face the front. Here, in the house portion 4b, the right front portion (the left front portion shown in FIG. 4) of the vehicle is the right front portion Rf, the right rear portion (the left back portion shown in FIG. 4) is the right rear portion Rr, and the left front portion (shown in FIG. 4). The right front portion) is referred to as the left front portion Lf, the left rear portion (the right back portion shown in FIG. 4) is referred to as the left rear portion Lr, and the portion between the right front portion Rf and the left front portion Lf is referred to as the center portion C.

  A cab 4a shown in FIG. 1 is provided corresponding to the left front portion Lf of the house portion 4b, and the base end of the boom 5 is attached to the center portion C so as to be movable up and down. The swivel body 4 having the house portion 4b is rotated about the vertical axis by the turning electric motor 21 (see FIG. 2) provided at the lower portion of the center portion C, that is, left and right along the turning direction D. Turn to. The right front portion Rf is provided with a step 31 and a handrail 32 for maintenance work.

  The power storage means 120, inverter circuits 18A, 20A, 20B, and the controller 30 shown in FIG. 2 are installed in the right front portion Rf. A window portion is formed at each of the right and left lower portions of the right front portion Rf. Between the right window portion 34 (see FIG. 5) and the left window portion 33, the capacitor 19 of the power storage means 120 is installed. Yes. That is, the left and right window portions 34 and 33 are formed as vent holes for allowing air for cooling the capacitor 19 to pass in the left-right direction. Details of the configuration of the right front portion Rf including the capacitor 19 will be described later.

  In the left rear portion Lr of FIG. 4, an engine radiator, an oil cooler, an intercooler, a fuel cooler, a hybrid system radiator (hybrid radiator), an air conditioner heat exchanger (air conditioner condenser) in the cab 4a, A cooler (not shown) is installed.

  Further, the engine 11, the transmission 13, the motor generator 12, the main pump 14, and the like shown in FIG. 2 are installed from the left rear portion Lr to the right rear portion Rr, that is, below the engine hood H constituting the top plate. ing. A fan (not shown) is connected to the engine 11. When the fan rotates as the engine rotates, air flows into the left rear portion Lr from the air vent 46 provided on the left side surface of the left front portion Lf. Flows, and each of the coolers installed in the left rear portion Lr is cooled. A pump chamber (not shown) that houses the motor generator 12 and the main pump 14 is formed in the right rear portion Rr.

  The central portion C is provided with a so-called A frame 47 that is a frame that supports the boom 5 so as to sandwich the boom 5 in a vertically movable manner, and a boom cylinder frame 48 that is a frame to which the base end of the boom cylinder 8 is attached. A turning electric motor 21 (see FIG. 2) is disposed in the vicinity of the rear of the A frame 47.

  Next, the configuration of the right front portion Rf including the capacitor 19 will be described with reference to FIGS. 5 and 6. FIG. 5 is a cross-sectional view of the capacitor 19 and the like installed at the lower part of the right front portion Rf as seen from the front. FIG. 5 shows a base frame B composed of a bottom frame Ba, which is a skeleton member that forms the bottom of the house portion 4b, and an outer peripheral frame Bb erected on the periphery (left side in FIG. 5) of the bottom frame Ba. It is shown. FIG. 6 is a perspective view of the state in which the door 61 at the right front portion of the house 4b is opened and the louver 36 in FIG. 5 is exposed as seen from the front right side of the vehicle.

  As shown in FIGS. 5 and 6, a single-open door 61 is attached to the right surface of the right front portion Rf, and a window portion 34 communicating with the outside is provided on the door 61, and the periphery of the window portion 34 is provided. A window frame 62 that extends horizontally from the inner side of the house portion 4b is provided, and a louver 36 is provided in an area surrounded by the window frame 62 and on the inner side of the window portion 34, and the right front portion Rf On the left side, a window 33 that communicates with the outside is provided on the outer wall of the house 4b, and a window frame 64 that extends horizontally from the side 63 of the peripheral edge of the window 33 toward the inside of the house 4b. The louver 35 is provided in an area surrounded by the window frame 64 and inside the window 33.

  A capacitor box 80 including the capacitor 19 is installed on the bottom frame Ba between the louvers 35 and 36 via a pedestal 155 and a vibration isolating rubber 156. The capacitor 19 is formed by arranging a large number of cells 41 in an upper stage and a lower stage, and an upper module 45 is constituted by an assembly of the upper cells 41, and a lower module 45 is constituted by an assembly of the lower cells 41. The capacitor box 80 is obtained by enclosing and reinforcing these modules 45, 45 with an outer frame so as to allow ventilation in the left-right direction.

  An intake duct (vent hole) 40 is connected to the right side (left side in FIG. 5) of the capacitor box 80, and a louver 38 is provided at the upstream end of the intake duct 40. In addition, a fan (cooling means) 43 for flowing cooling air from the left to the right in the drawing corresponds to each of the upper and lower cells 41 and 41 at the left end (right side in FIG. 5) of the capacitor box 80. 43, and an exhaust duct (vent) 39 is connected to the left side (right side in FIG. 5), and a louver 37 is provided at the downstream end of the exhaust duct 39. . The window frame 62 forms an opening 60 </ b> A connected to the intake duct 40, and the window frame 64 forms an opening 60 </ b> B connected to the exhaust duct 39. Further, the capacitor box 80, the intake duct 40, and the exhaust duct 39 constitute a casing.

  In the intake duct 40, a partition wall 44 that connects the upstream end between the upper module 45 and the lower module 45 and the downstream end of the louver 38, and partitions the interior of the intake duct 40 up and down. Is provided. The partition wall 44 also distributes the same amount of cooling air as the upper module 45 to the lower module 45 which is disposed below the louver 38 arranged side by side without being directly opposed. In order to increase the flow rate at the lower inlet than the flow rate at the upper inlet (louver 38 outlet), it is not horizontal but inclined downward with respect to the flow direction of the cooling air. Has been.

  The louver 36 on the intake side is inclined downward with respect to the flow direction of the cooling air flowing from the left to the right in the drawing, and the louver 38 in the intake duct 40 downstream thereof is inclined upward in the opposite direction to the louver 36. ing. Further, the louver 37 in the exhaust duct 39 is inclined downward with respect to the flow direction of the cooling air, and the exhaust-side louver 35 downstream thereof is inclined upward in the opposite direction to the louver 37. With such a louver configuration, the inside of the capacitor box 80 is waterproofed.

  Further, as described above, since the capacitor box 80 is installed on the bottom frame Ba, the installation position thereof is lower than the right side window 34 and the left side window 33. For this reason, the intake duct 40 and the exhaust duct 39 have a vertically asymmetric shape. That is, the intake duct 40 and the exhaust duct 39 have a shape that expands downward from the louvers 38 and 37 on both sides toward the capacitor box 80.

  A wire net (mesh member) 72 is provided between the louver 36 on the intake side and the louver 38 in the intake duct 40 at the opening 60A, and the louver 37 in the exhaust duct 39 and the louver 35 on the exhaust side. A wire mesh 71 is provided in the opening 60B. The wire nets 72 and 71 are attached to the side of the house part 4b of the openings 60A and 60B, respectively, and the size of the net is such that cooling air can be ventilated, and organisms such as insects and birds, dust, etc. From the inside of the capacitor box 80. Specifically, the wire mesh 72 on the intake side is guided to the inner surface of the window frame 62 along the rail 65 provided on the lower window frame 62 and is fixed to the window frame 62 by the fixing members 66 and 67. Thus, while being attached so as to close the window frame 62 of the window portion 34 provided on the door 61, it can be slid along the rail 65 of the window frame 62 in the direction perpendicular to the plane of FIG. The metal mesh 71 on the exhaust side can be attached to and detached from the window portion 64 of the window portion 33 provided on the side surface 63 of the house portion 4b.

  In addition, the connecting portion connecting the window frame 62 of the window portion 34 that forms the opening 60A on the upstream side and the intake duct 40 with respect to the capacitor box 80 can be opened and closed. The connection portion connecting the window frame 64 of the window portion 33 forming the downstream opening portion 60B and the exhaust duct 39 to the capacitor box 80 is airtightly attached. An insulation (heat insulation member) 75 for heat insulation is attached. The insulations 75 and 76 are made of, for example, a rubber sponge-like material and attached to the capacitor box 80 side.

  Here, the capacitor box 80, the intake duct 40, the exhaust duct 39, the window portion 34, the window portion 33, and the like are installed in the right front portion Rf, but are installed below the cab 4a in the left front portion Lf. It may be.

  According to the lifting magnet vehicle 1 having the above configuration, the outside air sucked into the house part 4b through the window part 34 and the window frame 62 of the house part 4b by the rotation of the fan 43 is used as cooling air as an intake duct. After flowing through 40 and introduced into the capacitor box 80 and contacting each cell 41 in the capacitor box 80, each cell 41 is cooled and then passed through the exhaust duct 39, the window frame 62, and the window 33 on the downstream side. It is discharged outside the house part 4b.

  In the lifting magnet vehicle 1 according to the present embodiment, the wire nets 71 and 72 are provided in the opening 60A and the opening 60B of the house portion 4b, respectively, so that the inside of the capacitor box 80 is formed from the openings 60A and 60B of the house portion 4b. It is possible to prevent foreign matter from entering. Insulation 76 is provided at the connecting portion that connects between the opening 60A of the house portion 4b and the intake duct 40, and at the connecting portion that connects between the opening 60B of the house portion 4b and the exhaust duct 39. By providing the insulation 75, heat generated in other devices such as an engine housed in the house 4b is prevented from being transmitted to the capacitor 19 in the capacitor box 80 through the connecting portion, and the temperature of the capacitor 19 is increased. Thus, the capacitor 19 can be suitably air-cooled by the cooling air flow path formed in the casing by the fan 43.

  Further, the louver 36 of the opening 60A and the louver 38 of the intake duct 40 are inclined in opposite directions along the flow direction of cooling air (the left-right direction in FIG. 5), and the louver 35 and the exhaust duct of the opening 60B. 39 louvers 37 are inclined in opposite directions along the flow direction of cooling air (the left-right direction in FIG. 5), so that rainwater due to rain or high-pressure washing water due to car washing can open openings 60A and 60B and intake ducts. Intrusion through the exhaust duct 39 can be prevented.

  FIG. 7 is a block diagram illustrating an internal configuration of an electric system, a hydraulic system, or the like of a construction machine according to still another embodiment.

  The configuration shown in FIG. 7 is a so-called series system. In the configuration of the parallel system shown in FIG. 2, instead of the configuration in which the transmission 13 and the main pump 14 are connected, the pump motor 140 and the inverter 18D are used. Are separately provided, and all the power of the engine 11 is once converted into electric energy to drive various driving elements.

  Specifically, inverter 18D is electrically connected to DC bus 110 (see FIG. 3) of power storage means 120 and controlled by controller 30. The output terminal of the inverter 18D is connected to the pump motor 140, and the pump motor 140 is driven and controlled by the inverter 18D. In addition, the electric power generated by the main pump 14 in the pump motor 140 is supplied as regenerative energy to the power storage means 120 via the inverter 18D.

  The present invention has been specifically described above based on the embodiment. However, the present invention is not limited to the above embodiment. For example, in the above embodiment, a lifting magnet type hybrid is described as being particularly suitable. Although the application to a type construction machine is described, it can also be applied to other construction machines such as an excavator, a wheel loader, and a crane.

  In the above embodiment, the wire nets 71 and 72 are described as having a mesh size that can prevent living things such as insects and birds and dirt from entering the capacitor box 80. In the case where a foreign matter different from external organisms and dust enters the capacitor box 80, a net-like member such as a dustproof net may be attached to the opening instead of the metal nets 71 and 72.

  Further, in the above embodiment, the case where the inclination angle of each of the intake-side louvers 36 and 38 and the exhaust-side louvers 35 and 37 is fixed is described, but at least one of the ventilation-side louvers 36 and 38 and The angle of at least one of the louvers 35 and 37 on the exhaust side may be adjustable. In this case, for example, the angle of these louvers can be optimized in accordance with changes in the weather and surrounding environment.

  DESCRIPTION OF SYMBOLS 1 ... Lifting magnet vehicle, 4 ... Swing body, 4b ... House part, 11 ... Engine, 12 ... Motor generator (power generation means), 13 ... Transmission, 14 ... Main pump (pump), 21 ... Electric motor for turning (electric) Drive means), 35, 36, 37, 38 ... louver, 38 ... exhaust duct, 40 ... intake duct (vent), 43 ... fan (cooling means), 60A, 60B ... opening, 71, 72 ... wire mesh (net-like) Member), 75, 76 ... insulation (heat insulating member), 80 ... capacitor box, 120 ... power storage means.

Claims (3)

In a construction machine comprising an engine, power generation means for generating power by driving the engine, power storage means for storing electric power generated by the power generation means, and electric drive means for driving with power from the power storage means,
A casing having a vent hole and containing the power storage means;
A body having one end connected to the outside and the other end connected to the vent, and containing the casing;
Cooling means provided in the casing and forming a cooling air passage for allowing outside air to flow into the casing as cooling air through the opening of the body and the vent of the casing;
With
The opening of the body is provided with a mesh member through which the cooling air can flow,
A construction machine characterized in that a heat insulation member for airtightly insulating the connection part is provided at a connection part that connects the opening of the body and the vent of the casing. The opening and the vent are each provided with a louver,
The construction machine according to claim 1, wherein the louver of the opening and the louver of the vent are inclined in directions opposite to each other along a flow direction of the cooling air. The construction machine according to claim 2, wherein an angle of at least one of the louver of the opening and the louver of the vent hole can be adjusted along a flow direction of the cooling air.

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