JP2011021430A - Construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction machine in which shortcircuit is prevented from occurring at the electric power input/output part of an electricity storage means. <P>SOLUTION: In this lifting magnet vehicle 1, a positive cable is electrically joined to a positive terminal and a negative cable is electrically joined to a negative terminal by inserting and screwing respective terminal joining screws to the terminals from the lower side upward at a terminal block which serves as the electric power input/output part of the capacitor of the electricity storage means. Since the terminal joining screws for joining the terminals and the wires are arranged so as to extend from the lower side upward, even if moisture occurs at the terminal block due to dew condensation, the moisture falls downward by itself, and does not adhere to or accumulate on the terminal joining screws. Consequently, shortcircuit is prevented from occurring. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a construction machine.

  2. Description of the Related Art Conventionally, a so-called hybrid construction machine has been proposed in which electric power is generated by driving an engine, electric power generated is stored in a power storage device, and driving of the engine or electric motor is driven by the stored electric power. As a power storage device used in such a construction machine, for example, a power storage device described in Patent Document 1 is known. This power storage device includes a module composed of a plurality of power storage cells, a cover that covers the module, a wiring box that accommodates wiring connected to the module, an attachment member for attaching external wiring to the wiring accommodated in the wiring box, and the like. I have.

JP 2008-187047 A

  However, in the power storage device described in Patent Document 1, the module, which is an assembly of cells, is covered with a cover. However, in a wiring box or a mounting member arranged outside the cover, rainwater or car washing due to rain occurs. No countermeasures have been disclosed for the infiltration of high-pressure washing water and moisture condensation due to changes in temperature. For this reason, moisture may stay in the input / output part of the power that connects the power storage device and the external wiring due to rain, washing, condensation, etc., which may cause a failure or electric shock due to a short circuit. .

  Accordingly, an object of the present invention is to provide a construction machine capable of preventing a short circuit in the power input / output unit of the power storage means.

  The construction machine of the present invention includes an engine, a power generation unit that generates power by driving the engine, a power storage unit that stores electric power generated by the power generation unit, and an electric drive unit that is driven by the power from the power storage unit. In the construction machine, the power storage means includes a terminal block provided with a positive terminal and a negative terminal for inputting / outputting electric power during power storage and driving, and a screwed state in which the terminal block is inserted from below to above in the terminal block Thus, a screw that electrically couples the positive wiring to the positive terminal and the negative wiring to the negative terminal is provided.

  According to the construction machine of the present invention, in the terminal block which is the power input / output unit of the power storage means, the screw is inserted from the lower side to the upper side to be screwed, so that the positive side wiring is connected to the positive side terminal. However, the negative wiring is electrically coupled to the negative terminal. By arranging the screw for connecting the terminal and the wiring from the bottom to the top in this way, even if moisture is generated in the terminal block due to condensation or the like, the moisture naturally falls downward. Since it does not adhere to or stay on the screw, it is possible to prevent a short circuit.

  Further, in the construction machine of the present invention, the power storage means includes a terminal block cover that covers the terminal block, and the terminal block cover has a maintenance opening formed on a lower surface thereof and covers the opening so that the opening can be opened and closed. A cover is preferably attached. According to such a configuration, since the maintenance opening is formed on the lower surface of the terminal block cover, removing the maintenance cover exposes the screw that couples the terminal and the wiring through the opening, so that Maintenance is possible, and maintenance can be easily performed to improve maintainability. Further, when maintenance is not performed, by attaching a maintenance cover, entry of moisture and dust from below is prevented, and the terminal block is protected.

  In the construction machine of the present invention, it is preferable that a packing be provided between the main body having the capacitor or battery of the power storage means and the terminal block cover. According to such a structure, the terminal block arrange | positioned on the outer side of the main-body part of an electrical storage means can be protected suitably from a water | moisture content or dust.

  In the construction machine of the present invention, it is preferable that a relay that can cut off input / output of electric power in the power storage means is disposed in the terminal block cover. According to such a configuration, the input / output of power can be disconnected by the relay at the time of key-off, so that safety is improved and the relay is arranged in the terminal block cover to protect the relay. .

  In the construction machine of the present invention, it is preferable that a partition wall is formed between the positive screw and the negative screw on the terminal block. According to such a configuration, the positive side terminal and the negative side terminal are reliably separated by the partition formed between the positive side screw and the negative side screw. Short circuit caused by tools can be prevented.

  In the construction machine of the present invention, it is preferable that the terminal block has a fuse arrangement portion for attaching a fuse, and the fuse is screwed to the fuse arrangement portion from below. According to such a configuration, the fuse can be accessed from below through the opening formed in the lower surface of the terminal block cover. Therefore, the fuse can be easily attached / detached by attaching / detaching the screw.

  Furthermore, in the construction machine of the present invention, it is preferable that the terminal block is mounted on the vehicle and disposed on the vehicle rear side with respect to the main body having the capacitor or battery of the power storage means. According to such a configuration, the terminal block can be suitably protected even when an impact is applied from the front of the vehicle.

  According to the construction machine of the present invention, a short circuit can be prevented at the power input / output portion of the power storage means.

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 a circuit diagram which shows the internal structure of a capacitor box. It is a side view which shows the right front part of the house part in FIG. It is the perspective view which looked at the capacitor box from the back side. It is a perspective view which shows the terminal block of a junction box. It is the XX sectional view taken on the line of FIG. It is the perspective view which looked at the terminal block from the bottom face side. It is the figure which looked at the junction box from the bottom side. 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). ) 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 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 driver's 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 shown in FIG. 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. Openings are formed in the lower left and right surfaces of the right front portion Rf, and the capacitor 19 of the power storage means 120 is installed between the opening 34 (see FIG. 5) on the right surface and the opening 33 on the left surface. Yes. That is, the openings 34 and 33 on the left and right surfaces are formed as vents that allow air for cooling the capacitor 19 to pass in the left and right direction.

  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.

    As shown in FIG. 5, louvers 36 and 35 are respectively provided inside the right-side opening 34 and the left-side opening 33 in the right front portion Rf. 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 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 in the intake duct 40 so as to face the louver 36. Also, fans 43, 43 for flowing cooling air from the left to the right in the figure are provided at the left end (right side in FIG. 5) of the capacitor box 80 in correspondence with the upper and lower cells 41, 41, respectively. Further, an exhaust duct 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 so as to face the louver 35.

  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, its installation position is lower than the opening 34 on the right side and the opening 33 on the left side. 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.

  Further, 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.

  Here, the capacitor box 80, the intake duct 40, the exhaust duct 39, the opening 34, the opening 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.

  Further, 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), a heat exchanger for an air conditioner of the cab 4a (an air conditioner condenser). ) (Both not shown) are 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, and the fan rotates with the rotation of the engine 11, so that the air vent 46 provided on the left side surface of the left front portion Lf is directed into the left rear portion Lr. Air 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 electrical configuration of the capacitor box 80 will be described. FIG. 6 is a circuit diagram showing the internal configuration of the capacitor box 80. The capacitor box 80 receives the electric power stored in the upper module 45 and the lower module 45 formed by the assembly of the cells 41, the safety switch 51 provided between the modules 45 and 45, and the capacitor 19 including the modules 45 and 45. And a junction box 50 which is a part for inputting / outputting to / from the buck-boost converter 100 shown in FIG.

  The junction box 50 is connected to the positive end of the upper module 45 by a positive capacitor cable 61 (see FIG. 8) and serves as a positive terminal 52 of the capacitor 19, and the upper module 45 and the positive side. A positive relay 53 and a fuse 54 provided in series with the terminal 52 are connected to the negative end of the lower module 45 by a negative capacitor cable 62 (see FIG. 8). A negative terminal 55 serving as a terminal, and a negative relay 56 provided between the lower module 45 and the negative terminal 55 are provided.

  The safety switch 51 is a switch for manually shutting off the circuit of the capacitor 19 during maintenance. The positive side relay 53 and the negative side relay 56 of the junction box 50 can cut off the input / output of electric power in the capacitor 19 by connecting / disconnecting the circuit of the capacitor 19 in conjunction with the on / off of the ignition key by the operator. It is. The fuse 54 cuts off the circuit when a current exceeding a predetermined flow rate flows through the circuit of the capacitor 19 due to a short circuit or the like.

  FIG. 7 is a side view showing the right front portion Rf of the house portion 4b. As shown in FIG. 7, on the base frame B, from the bottom to the top, the capacitor box 80 to which the intake duct 40 and the exhaust duct 39 are connected, the inverter circuits 18A, 20A, 20B, the step-up / down converter 100, and A controller 30 is mounted. The capacitor box 80 is covered with a step (step) 31 along with the intake duct 40 and the exhaust duct 39, and the inverter circuits 18A, 20A, 20B, the step-up / down converter 100, and the controller 30 The upper part and the upper part are covered with the front plate 58 constituting the step and the top plate 59 of the house part 4b, so that they are protected against loads and impacts from the front and above. In addition, a side panel that can be opened and closed is provided on the right side surface (front side in the figure) of the right front portion Rf (in an open state in FIG. 7). As described above, the right side portion of the right front portion Rf has an opening on the right surface. A portion 34 and a louver 36 (both see FIG. 5) are provided.

  Further, in the capacitor box 80 arranged in the lowermost right front portion Rf, the safety switch 51 is provided on the front side of the vehicle (right side in FIG. 7), and the junction box 50 is provided on the rear side of the vehicle (left side in FIG. 7). During vehicle maintenance, the safety switch 51 can be accessed from the right side by opening the side panel, and the junction box 50 has an under cover (not shown) provided on the lower surface of the right front portion Rf removed. Is accessible from below.

  FIG. 8 is a perspective view of the capacitor box 80 as seen from the back side, that is, the vehicle rear side. In FIG. 8, the intake duct 40 and louver 38 connected to the right side of the capacitor box 80 and the exhaust duct 39 and louver 37 connected to the left side of the capacitor box 80 are shown together with the capacitor box 80. The main body 82 of the capacitor box 80 is obtained by surrounding the capacitor 19 composed of the upper and lower modules 45 and 45 shown in FIGS. 5 and 6 with a hollow outer frame 81 having a substantially rectangular parallelepiped shape. The junction box 50 is disposed on the vehicle rear side (front side in the figure) of the main body 82, and is a junction box cover (terminal block) that covers power input / output units such as the positive terminal 52 and the negative terminal 55 shown in FIG. Cover) 60 is provided.

  FIG. 9 is a perspective view showing the terminal block 67 and the like housed in the junction box cover 60 shown in FIG. As shown in FIG. 9, in the junction box cover 60, a terminal block 67 fixed on the back side of the outer frame 81 and provided with a positive terminal 52 and a negative terminal 55 (both see FIG. 6); A positive relay 53 and a negative relay 56 that are attached to the upper portion of the terminal block 67 and connected to the positive terminal 52 and the negative terminal 55 are accommodated. The positive capacitor cable 61 from the upper module 45 (see FIGS. 5 and 6) housed in the outer frame 81 and the negative capacitor cable 62 from the lower module 45 (see FIGS. 5 and 6) are connected to the positive relay 53. Are connected to the negative relay 56.

  Further, a positive side cable 63 connected to the reactor 101 (see FIG. 3) of the buck-boost converter 100 and a negative side cable 64 that is a negative side wiring of the DC bus 110 (see FIG. 3) are inserted into the terminal block 67. Each of them is connected to a positive terminal 52 and a negative terminal 55 inside the terminal block 67 (details will be described later). Further, an upper partition wall 68 for preventing a short circuit between the connecting portions is formed between the positive side connecting portion and the negative side connecting portion.

  Further, as shown in FIGS. 8 and 9, intrusion of rain water or high-pressure washing water into the junction box cover 60 is prevented at the insertion portion of the positive side capacitor cable 61 and the negative side capacitor cable 62 in the junction box cover 60. A waterproof connector 66 is provided.

  10 is a cross-sectional view taken along line XX of FIG. FIG. 10 shows a coupling state between the negative terminal 55 and the negative cable 64. Here, an insertion portion 55 a into which the terminal coupling screw 74 can be inserted is formed in the bus bar 55 as a negative terminal provided in the terminal block 67. An insertion portion through which the terminal coupling screw 74 can be inserted is also formed in a portion corresponding to the insertion portion 55 a of the terminal block 67. The cable terminal 73 provided at the tip of the negative cable 64 is a round terminal having an insertion portion through which the terminal coupling screw 74 can be inserted. Then, in a state where the insertion portion of the cable terminal 73 is overlapped with the insertion portion of the terminal block 67, the terminal coupling screw 74 is inserted from below to above, and the male screw portion through the insertion portion 55a of the bus bar 55 is connected to the bus bar. The bus bar 55 and the negative cable 64 are electrically coupled to each other by being screwed into a female screw portion 57 provided in advance on 55.

  11 is a perspective view of the terminal block 67 as seen from the bottom surface side, and FIG. 12 is a view of the junction box 50 as seen from the bottom surface side. As shown in FIG. 11, in the positive cable 63 as well, as in the case of the negative cable 64 described above, the terminal coupling screw 72 is inserted from the lower side to the upper side and screwed into the female screw part. A positive bus bar (not shown), which is the positive terminal 52, and the positive cable 63 are electrically coupled.

  Further, the terminal block 67 has a positive partition wall protruding downward so as to surround the cable terminals 71 and 73 from both the left and right sides so as to separate the positive terminal coupling screw 72 and the negative terminal coupling screw 74 from each other. 78 and a negative-side partition wall 79 are formed.

  Below the terminal block 67, a fuse arrangement portion 75 is provided on the right side of the positive partition wall 78, and a fuse 54 is attached below the fuse arrangement portion 75. In the fuse 54, two fuse mounting screws 77 are inserted from the lower side to the upper side, and are screwed from the lower side as in the case of the terminal coupling screws 72 and 74, whereby the fuse arrangement portion 75 is fixed. Attached.

  Returning to FIG. 10, in order to waterproof the inside of the junction box 50, packing is provided between the junction box cover 60 and the outer frame 81 of the main body 82 around the entire joint surface of the junction box cover 60 to the outer frame 81. 76 is provided. Further, a waterproof O-ring 70 is provided around the portion of the negative cable 64 that is inserted through the junction box cover 60. Similarly to this, an O-ring (not shown) is also provided in a portion of the positive cable 63 that is inserted through the junction box cover 60.

  Further, as shown in FIGS. 10 and 12, openings 84 and 84 for maintenance are formed on the lower surface of the junction box cover 60 at lower positions corresponding to the terminal coupling screws 72 and 74. A maintenance cover 85 is attached to cover 84 and 84 so that they can be opened and closed from below. A waterproof packing 86 is provided between the junction box cover 60 and the maintenance cover 85.

  As shown in FIG. 12, an opening 88 is formed on the lower surface of the junction box cover 60 at a lower position corresponding to the fuse 54 on the right side of the openings 84, 84. The opening 88 can be opened and closed from below. A maintenance cover 89 is attached. A waterproof packing (not shown) is provided between the junction box cover 60 and the maintenance cover 89.

  According to the lifting magnet vehicle 1 of the present embodiment described above, the terminal coupling screws 72 and 74 are inserted from the bottom to the top in the terminal block 67 that is the power input / output unit of the capacitor 19 of the power storage means 120. By being screwed, the positive cable 63 is electrically connected to the positive terminal 52, and the negative cable 64 is electrically connected to the negative terminal 55. Even when the terminal block 67 has moisture due to dew condensation or the like by arranging the terminal coupling screws 72 and 74 for coupling the terminal and the wiring from the lower side to the upper side in this way, the moisture is generated. Naturally falls downward and does not adhere to or stay on the terminal coupling screws 72 and 74, so that a short circuit can be prevented.

  Further, according to the lifting magnet vehicle 1, the maintenance openings 84, 84 are formed on the lower surface of the junction box cover 60, so that the terminal and the wiring are connected through the openings 84, 84 by removing the maintenance cover 85. The terminal coupling screws 72 and 74 to be coupled are exposed, and maintenance from below is possible, so that maintenance can be easily performed and the maintainability can be improved. Further, when maintenance is not performed, the maintenance cover 85 is attached to prevent moisture and dust from entering from below, thereby protecting the terminal block.

  Further, since the packing 76 is provided between the outer frame 81 of the main body 82 and the junction box cover 60, the terminal block 67 disposed outside the main body 82 is suitably protected from moisture and dust. be able to.

  In addition, since the positive side relay 53 and the negative side relay 56 that can cut off the input / output of electric power in the capacitor 19 are arranged in the junction box cover 60, the electric power is supplied by the relays 53, 56 when the ignition key is turned off. Can be disconnected to improve safety, and by disposing the relays 53 and 56 in the junction box cover 60, the relays 53 and 56 can be protected.

  Further, the terminal block 67 is formed with a positive partition wall 78 and a negative partition wall 79 between the positive terminal coupling screw 72 and the negative terminal coupling screw 74, so that the positive side is formed by the partition walls 78 and 79. The terminal 52 and the negative terminal 55 are reliably separated from each other, and a short circuit due to moisture or a short circuit due to a tool during operation can be prevented.

  Further, the terminal block 67 has a fuse arrangement portion 75 for attaching the fuse 54, and the fuse 54 is screwed to the fuse arrangement portion 75 from below, so that it is formed on the lower surface of the junction box cover 60. Through the opening 88, the fuse 54 can be accessed from below, and the fuse can be easily attached or detached by attaching or removing screws.

  Furthermore, since the terminal block 67 is disposed on the vehicle rear side with respect to the main body portion 82 having the capacitor 19, the terminal block 67 can be suitably protected even when an impact is applied from the front of the vehicle.

  FIG. 13 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. 13 is called a so-called series system. In the parallel system configuration 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.

  DESCRIPTION OF SYMBOLS 1 ... Lifting magnet vehicle (construction machine), 11 ... Engine, 12 ... Motor generator (power generation means), 19 ... Capacitor, 21 ... Electric motor for turning (electric drive means), 52 ... Positive side terminal, 53 ... Positive side relay 54 ... fuse, 55 ... negative terminal, 56 ... negative relay, 60 ... junction box cover (terminal block cover), 63 ... positive cable (positive wiring), 64 ... negative cable (negative wiring), 67 ... Terminal block, 72, 74 ... Terminal coupling screw (screw), 75 ... Fuse placement portion, 76 ... Packing, 77 ... Fuse mounting screw, 78 ... Positive side partition (partition), 79 ... Negative side partition (partition), 82... Main body, 84, 88... Opening, 85, 89... Maintenance cover, 120.

Claims (7)

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,
The power storage means includes a terminal block provided with a positive side terminal and a negative side terminal for inputting and outputting power in power storage and driving, and
A screw for electrically connecting a positive side wiring to the positive side terminal and a negative side wiring to the negative side terminal by being inserted from below to above in the terminal block and being screwed,
Construction machine characterized by comprising. The power storage means includes a terminal block cover that covers the terminal block,
2. The construction machine according to claim 1, wherein a maintenance opening is formed on a lower surface of the terminal block cover, and a maintenance cover that covers the opening so as to be opened and closed is attached.   The construction machine according to claim 2, wherein a packing is provided between a main body having a capacitor or battery of the power storage means and the terminal block cover.   The construction machine according to claim 2 or 3, wherein a relay capable of cutting off input / output of electric power in the power storage means is disposed in the terminal block cover.   The construction machine according to any one of claims 1 to 4, wherein a partition wall is formed between a positive screw and a negative screw on the terminal block.   The said terminal block has a fuse arrangement | positioning part for attaching a fuse, and the said fuse is screwed from the lower side with respect to the said fuse arrangement | positioning part, It is any one of Claims 2-4 The construction machine described.   The construction machine according to any one of claims 1 to 6, wherein the terminal block is mounted on a vehicle and disposed on a vehicle rear side with respect to a main body having a capacitor or a battery of the power storage means. .

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