Patent Abstract:
Disclosed is construction machine with improved safety. A high voltage cable ( 63 ( 53 )) for supplying power that connects a storage means to an electric drive means ( 21 ) that drives by means of power from a power generation means ( 12 ), which generates power by means of the drive of an engine, or from the storage means, which stores the power generated by the power generation means ( 12 ), is wired along the sides of a frame structural member ( 47 ) that protrudes in a vertical direction, whereby said frame structural member ( 47 ) serves as an upright wall to adequately protect the high voltage cable ( 63 ); and even in cases in which, for example, the construction machine strikes an obstruction, or the like, the high voltage cable ( 63 ) is adequately protected by said frame structural member ( 47 ).

Full Description:
TECHNICAL FIELD 
       [0001]    The present invention relates to a construction machine. 
       BACKGROUND ART 
       [0002]    In the past, there has been proposed a so-called hybrid construction machine that generates power by the drive of an engine, stores the generated power in an electrical storage device, and assists the drive of the engine using the stored power. For example, a generator, an electrical storage device, and an inverter, which controls charge and power supply between these, are closely disposed in a centralized configuration in a construction machine disclosed in the following PTL 1, so that the lengths of wires connecting electrical devices are short. 
       CITATION LIST 
     Patent Literature 
       [0000]    
       
         [PTL 1] JP-A-2004-169466 
       
     
       SUMMARY OF INVENTION 
     Technical Problem 
       [0004]    However, actually, there is a case where the respective electrical devices cannot be closely disposed in a centralized configuration. For this reason, it is hoped that wires for connecting electrical devices, which cannot be closely disposed in a centralized configuration as described above, can be safely disposed. 
         [0005]    Accordingly, an object of the invention is to provide a construction machine where the safety of wires is improved. 
       Solution to Problem 
       [0006]    A construction machine of the invention includes an engine, power generation means for generating power by the drive of the engine, storage means for storing the power generated by the power generation means, and electric drive means that is driven by the power from the storage means. High voltage cables, which connect the power generation means or the electric drive means to the storage means and through which power is supplied, are wired along a side surface of a frame structural member that protrudes in a vertical direction. 
         [0007]    According to the construction machine of the invention, since the high voltage cables are wired along the side surface of the frame structural member protruding in the vertical direction, the frame structural member becomes an upright wall, so that the high voltage cables are adequately protected. Accordingly, for example, even when the construction machine collides with an obstruction or the like, the high voltage cables are adequately protected by the frame structural member. As a result, safety is improved. 
         [0008]    Here, the high voltage cables, which are wired along the side surface of the frame structural member, may be specifically high voltage cables between the power generation means and an inverter that is connected to the storage means and controls the power generation means or high voltage cables between the electric drive means and an inverter that is connected to the storage means and controls the electric drive means. 
         [0009]    Further, the frame structural member may be an A-frame that supports a boom for work so as to allow the boom for work to be capable of moving up and down, and the high voltage cables may be wired along an inner side surface of the A-frame. When this structure is employed, the high voltage cables are adequately protected by the A-frame having high rigidity, so that it is possible to improve safety. In addition, for example, even when the construction machine collides with an obstruction or the like, the A-frame is separated from a collision portion since it is disposed at a central portion. Accordingly, the high voltage cables are more adequately protected. 
         [0010]    Moreover, the frame structural member may be a side frame that forms an end portion of a base frame and forms a closed cross-sectional space, and the high voltage cables may be wired so as to pass through the side frame. Since the high voltage cables pass through the side frame that has high rigidity and forms a closed cross-section when this structure is employed, the high voltage cables are adequately protected, so that safety can be improved. Further, since the side frame surrounding the high voltage cables blocks electromagnetic waves as described above, electromagnetic shielding performance can be improved. 
       Advantageous Effects of Invention 
       [0011]    According to the construction machine of the invention, it is possible to adequately protect high voltage cables and to improve safety. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0012]      FIG. 1  is a perspective view showing the appearance of a construction machine according to a first embodiment of the invention. 
           [0013]      FIG. 2  is a block diagram showing the internal structure of an electrical system, a hydraulic system, and the like of the construction machine shown in  FIG. 1 . 
           [0014]      FIG. 3  is a circuit diagram showing the internal structure of storage means shown in  FIG. 2 . 
           [0015]      FIG. 4  is a perspective view showing a house portion of a revolving body shown in  FIG. 1 . 
           [0016]      FIG. 5  is a cross-sectional view showing a state where a capacitor box of storage means is installed in the house portion. 
           [0017]      FIG. 6  is a perspective view showing wires of high voltage cables, which connect a revolving electric motor to an inverter circuit thereof, together with a base frame, an A-frame, and components in a right front portion of the house portion, and is a perspective view as seen from the rear upper side of a left portion of a vehicle. 
           [0018]      FIG. 7  is a perspective view of  FIG. 6  as seen from the rear upper side of a right portion of a vehicle. 
           [0019]      FIG. 8  is a plan view of  FIGS. 6 and 7 . 
           [0020]      FIG. 9  is a perspective view showing wires of high voltage cables, which connect an electric generator to an inverter circuit thereof, together with a base frame, an A-frame, and components in a right front portion of the house portion, and is a perspective view as seen from the rear upper side of a left portion of a vehicle. 
           [0021]      FIG. 10  is a perspective view of  FIG. 9  as seen from the rear upper side of a right portion of a vehicle. 
           [0022]      FIG. 11  is a plan view of  FIGS. 9 and 10 . 
           [0023]      FIG. 12  is a view taken along line XII-XII of  FIG. 11 . 
           [0024]      FIG. 13  is a perspective view showing main portions of a construction machine according to a second embodiment of the invention, is a perspective view showing wires of high voltage cables, which connect an electric generator to an inverter circuit thereof, together with a base frame, A-frames, and components in a right front portion of a house portion, and is a perspective view as seen from the rear upper side of a left portion of a vehicle. 
           [0025]      FIG. 14  is a perspective view of  FIG. 13  as seen from the rear upper side of a right portion of a vehicle. 
           [0026]      FIG. 15  is a plan view of  FIGS. 13 and 14 . 
           [0027]      FIG. 16  is a block diagram showing the internal structure of an electrical system, a hydraulic system, and the like of a construction machine according to another embodiment. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0028]    Preferred embodiments of a construction machine according to the invention will be described below with reference to the drawings. Meanwhile, the same elements in the description of the drawings are denoted by the same reference numerals, and repeated description thereof will be omitted. 
         [0029]      FIG. 1  is a perspective view showing the appearance of a construction machine according to a first embodiment of the invention. The construction machine of this embodiment is a so-called hybrid construction machine, and a lifting magnet vehicle as an example of the construction machine is shown. 
         [0030]    As shown in  FIG. 1 , a lifting magnet vehicle  1  includes a traveling mechanism  2  that includes caterpillar tracks and a revolving body  4  that is rotatably mounted on the traveling mechanism  2  with a revolving mechanism  3  interposed therebetween. A boom  5  for work, an arm  6  link-connected to an end of the boom  5 , and a lifting magnet  7  link-connected to an end of the arm  6  are mounted on the revolving body  4 . The lifting magnet  7  is apiece of equipment that attracts a load G such as steel material by a magnetic force so as to catch the load. The boom  5 , the arm  6 , and the lifting magnet  7  are hydraulically driven by a boom cylinder  8 , an arm cylinder  9 , and a bucket cylinder  10 , respectively. 
         [0031]    Further, the revolving body  4  is provided with an operator&#39;s cab  4   a  and a house portion  4   b . The operator&#39;s cab  4   a  accommodates an operator who adjusts the position of the lifting magnet  7  and performs an exitation operation and a release operation of the lifting magnet. The house portion  4   b  accommodates a power source, that is, an engine  11  (see  FIG. 2 ) that is a power source for generating hydraulic pressure, and the like. The engine  11  is formed of, for example, a diesel engine. 
         [0032]      FIG. 2  is a block diagram showing the internal structure of an electrical system, a hydraulic system, and the like of the construction machine shown in  FIG. 1 , and the structure is a so-called parallel type. Meanwhile, in  FIG. 2 , systems mechanically transmitting power are shown by double lines, a hydraulic system is shown by a thick solid line, a control system is shown by a broken line, and an electrical system is shown by a thin solid line. Further,  FIG. 3  is a diagram showing the internal structure of storage means  120  shown in  FIG. 2 . 
         [0033]    As shown in  FIG. 2 , the lifting magnet vehicle  1  includes an electric generator (power generation means)  12  and a transmission  13 , and rotating shafts of the engine  11  and the electric generator  12  are connected together to an input shaft of the transmission  13 , so that the engine  11  and the electric generator  12  are connected to each other. When a load of the engine  11  is large, the electric 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 electric generator  12  is transmitted to a main pump  14  through an output shaft of the transmission  13 . Meanwhile, when the load of the engine  11  is small, the driving force of the engine  11  is transmitted to the electric generator  12  through the transmission  13 . Accordingly, the electric generator  12  generates power. 
         [0034]    The electric generator  12  is formed of, for example, an IPM (Interior Permanent Magnetic) motor where magnets are embedded in a rotor. Switching between the drive and power generation of the electric generator  12  is performed by a controller  30 , which controls the drive of the electrical system of the lifting magnet vehicle  1 , according to the load of the engine  11  and the like. 
         [0035]    The 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  through a high-pressure hydraulic line  16 . The control valve  17  is a unit that controls the hydraulic system of the lifting magnet vehicle  1 . In addition to left and right hydraulic motors  2   a  and  2   b  that drive the traveling mechanism  2  shown in  FIG. 1 , the boom cylinder  8 , the arm cylinder  9 , and the bucket cylinder  10  are connected to the control valve  17  through hydraulic lines, and the control valve  17  controls hydraulic pressure, which is supplied to these cylinders and motors, according to driver&#39;s operation input. 
         [0036]    An output end of an inverter circuit (inverter)  18 A is connected to an electrical terminal of the electric generator  12 . The storage means  120  is connected to an input end of the inverter circuit  18 A. As shown in  FIG. 3 , the storage means  120  includes a DC bus  110  that is a DC bus bar, a step-up/down converter  100 , and a capacitor  19 . That is, an input end of the inverter circuit  18 A is connected to an input end of the step-up/down converter  100  through the DC bus  110 . The capacitor  19  is connected to an output end of the step-up/down converter  100 . Here, the capacitor  19  includes a plurality of cells. Meanwhile, a battery may be used instead of the capacitor. 
         [0037]    Returning to  FIG. 2 , the inverter circuit  18 A controls the operation of the electric generator  12  on the basis of an instruction from the controller  30 . That is, when electrically operating (assisting) the electric generator  12 , the inverter circuit  18 A supplies required power to the electric generator  12  from the capacitor  19  and the step-up/down converter  100  through the DC bus  110 . Further, when the electric generator  12  is operated so as to generate power, power generated by the electric generator  12  is stored in the capacitor  19  through the DC bus  110  and the step-up/down converter  100 . Meanwhile, switching between the step-up operation and step-down operation of the step-up/down converter  100  is controlled by the controller  30  on the basis of a voltage value of the DC bus, a voltage value of the capacitor, and a current value of the capacitor. Accordingly, it is possible to maintain the DC bus  110  in a state where the DC bus is charged at a predetermined constant voltage value. 
         [0038]    Furthermore, the lifting magnet  7  shown in  FIG. 1  is connected to the DC bus  110  of the storage means  120  through an inverter circuit  20 B. The lifting magnet  7  includes an electromagnet that generates a magnetic force for magnetically attracting metal materials, and is supplied with power from the DC bus  110  through the inverter circuit  20 B. The inverter circuit  20 B supplies required power to the lifting magnet  7  from the DC bus  110  when turning on the electromagnet on the basis of an instruction from the controller  30 . Moreover, the inverter circuit  20 B supplies regenerated power to the DC bus  110  when turning off the electromagnet. 
         [0039]    In addition, an inverter circuit (inverter)  20 A is connected to the storage means  120 . A revolving electric motor (AC electric motor; electric drive means)  21  as an electric motor for work is connected to one end of the inverter circuit  20 A, and the other end of the inverter circuit  20 A is connected to the DC bus  110  of the storage means  120 . The revolving electric motor  21  is a power source of the revolving mechanism  3  shown in  FIG. 1  that revolves the revolving body  4 . A resolver  22 , a mechanical brake  23 , and a revolving reduction gear  24  are connected to a rotating shaft  21 A of the revolving electric motor  21 . 
         [0040]    When the revolving electric motor  21  performs a power running operation, the torque of a rotational driving force of the revolving electric motor  21  is amplified at the revolving reduction gear  24 . Accordingly, the acceleration and deceleration of the revolving body  4  are controlled and the revolving body  4  is operated so as to rotate. Further, rotation speed is increased at the revolving reduction gear  24  by the inertial rotation of the revolving body  4  and is transmitted to the revolving electric motor  21 , so that the regenerated power is generated. The revolving electric motor  21  is AC-driven according to a PWM (Pulse Width Modulation) control signal by the inverter circuit  20 A. For example, a magnet embedded type IPM motor is preferred as the revolving electric motor  21 . 
         [0041]    The resolver  22  is a sensor that detects the rotational position and the rotation angle of the rotating shaft  21 A of the revolving electric motor  21 , and detects the rotation angle and the rotating direction of the rotating shaft  21 A by being mechanically connected to the revolving electric motor  21 . The resolver  22  derives the rotation angle and the rotating direction of the revolving mechanism  3  by detecting the rotation angle of the rotating shaft  21 A. The mechanical brake  23  is a braking device that generates a mechanical braking force, and mechanically stops the rotating shaft  21 A of the revolving electric motor  21  according to an instruction from the controller  30 . The revolving reduction gear  24  is a reduction gear that reduces the rotating speed of the rotating shaft  21 A of the revolving electric motor  21  and mechanically transmits the rotating speed to the revolving mechanism  3 . 
         [0042]    Meanwhile, since the electric generator  12 , the revolving electric motor  21 , and the lifting magnet  7  are connected to the DC bus  110  through the inverter circuits  18 A,  20 A, and  20 B, the power generated by the electric generator  12  may be directly supplied to the lifting magnet  7  or the revolving electric motor  21 , the power regenerated by the lifting magnet  7  may be supplied to the electric generator  12  or the revolving electric motor  21 , and the power regenerated by the revolving electric motor  21  may be supplied to the electric generator  12  or the lifting magnet  7 . 
         [0043]    An operating device  26  is connected to the pilot pump  15  through a pilot line  25 . The operating device  26  is an operating device that operates the revolving electric motor  21 , the traveling mechanism  2 , the boom  5 , the arm  6 , and the lifting magnet  7 . The operating device  26  is operated by an operator. The control valve  17  is connected to the operating device  26  through a hydraulic line  27 , and a pressure sensor  29  is connected to the operating device  26  through a hydraulic line  28 . The operating device  26  converts hydraulic pressure (primary-side hydraulic pressure), which is supplied through the pilot line  25 , into hydraulic pressure (secondary-side hydraulic pressure), which corresponds to the amount of work performed by an operator, and outputs the converted hydraulic pressure. The secondary-side hydraulic pressure, which is output from the operating device  26 , is supplied to the control valve  17  through the hydraulic line  27  and is detected by the pressure sensor  29 . 
         [0044]    When an operation for revolving the revolving mechanism  3  is input to the operating device  26 , the pressure sensor  29  detects the amount of operation as the change of hydraulic pressure in the hydraulic line  28 . The pressure sensor  29  outputs an electrical signal that represents hydraulic pressure in the hydraulic line  28 . This electrical signal is input to the controller  30 , and is used to control the drive of the revolving electric motor  21 . 
         [0045]    The controller  30  forms a control circuit of this embodiment. The controller  30  is formed of a processing unit that includes a CPU and an internal memory. The CPU executes a drive control program stored in the internal memory, so that the controller  30  is realized. Further, a power supply of the controller  30  is a battery (for example, 24V in-vehicle battery) that is separate from the capacitor  19 . The controller  30  converts a signal, which represents the amount of operation required for revolving the revolving mechanism  3 , among signals input from the pressure sensor  29  into a speed instruction, and controls the drive of the revolving electric motor  21 . Further, the controller  30  controls the charge and discharge of the capacitor  19  that is performed by the control of the operation of the electric generator  12  (switching between an assist operation and a power generating operation), the control of the drive of the lifting magnet  7  (switching between excitation and demagnetization), and the control of the drive of the step-up/down converter  100 . 
         [0046]    Here, the step-up/down converter  100  of this embodiment will be described in detail. As shown in  FIG. 3 , the step-up/down converter  100  has a step-up/down switching control system, and includes a reactor  101  and transistors  100 B and  100 C. The transistor  100 B is a step-up switching element, and the transistor  100 C is a step-down switching element. The transistors  100 B and  100 C are formed of, for example, IGBTs (Insulated Gate Bipolar Transistors), and are connected in series to each other. 
         [0047]    Specifically, a collector of the transistor  100 B and an emitter of the transistor  100 C are connected to each other, an emitter of the transistor  100 B is connected to a negative-side terminal of the capacitor  19  and a negative-side wire of the DC bus  110 , and a collector of the transistor  100 C is connected to a positive-side wire of the DC bus  110 . Further, one end of the reactor  101  is connected to the collector of the transistor  100 B and the emitter of the transistor  100 C, and the other end of the reactor  101  is connected to a positive-side terminal of the capacitor  19 . A PWM voltage is applied to gates of the transistors  100 B and  100 C from the controller  30 . 
         [0048]    Meanwhile, a diode  100   b , which is a rectifying element, is connected in parallel in an opposite direction between the collector and the emitter of the transistor  100 B. Likewise, a diode  100   c  is connected in parallel in an opposite direction between the collector and the emitter of the transistor  100 C. A smoothing capacitor  110   a  of the DC bus  110  is connected between the collector of the transistor  100 C and the emitter of the transistor  100 B (that is, between the positive-side wire and the negative-side wire of the DC bus  110 ). The capacitor  110   a  smoothes a voltage that is output from the step-up/down converter  100 , a voltage that is generated from the electric generator  12 , and a voltage that is regenerated from the revolving electric motor  21 . 
         [0049]    In the step-up/down converter  100  having the above-mentioned structure, a PWM voltage is applied to the gate of the transistor  100 B according to an instruction from the controller  30  when DC power is supplied to the DC bus  110  from the capacitor  19 . Further, an induced electromotive force generated at the reactor  101  is transmitted through the diode  100   c  according to the turning-on/off of the transistor  100 B, and this power is smoothed by the capacitor  110   a . Furthermore, when DC power is supplied to the capacitor  19  from the DC bus  110 , a PWM voltage is applied to a gate of the transistor  100 C according to an instruction from the controller  30  and current output from the transistor  100 C is smoothed by the reactor  101 . 
         [0050]    Subsequently, the revolving body  4  will be described.  FIG. 4  is a perspective view showing the house portion  4   b  of the revolving body  4 . Hereinafter, in the description of the structure of the house portion  4   b , the front, the rear, the left, and the right means the front, the rear, the left, and the right of the lifting magnet vehicle  1  unless otherwise particularly mentioned. As shown in  FIG. 4 , the house portion  4   b  is formed so as to have a substantially U-shape in plan view, and is disposed so that an opened portion of the U-shape faces forward. Here, in the house portion  4   b , a right front portion (a left front portion shown in  FIG. 4 ) of a vehicle is referred to as a right front portion Rf, a right rear portion (a left back portion shown in  FIG. 4 ) is referred to as a right rear portion Rr, a left front portion (a right front portion shown in  FIG. 4 ) is referred to as a left front portion Lf, a left rear portion (a right back portion shown in  FIG. 4 ) is referred to as a left rear portion Lr, and a portion between the right front portion Rf and the left front portion Lf is referred to as a central portion C. 
         [0051]    The operator&#39;s cab  4   a  shown in  FIG. 1  is provided so as to correspond to the left front portion Lf of the house portion  4   b , and a base end of the boom  5  is mounted on the central portion C so as to be capable of moving up and down. Further, the revolving body  4  including the house portion  4   b  is rotated about an axis extending in a vertical direction, that is, is revolved to left and right in a revolving direction D by the revolving electric motor  21  (see  FIG. 2 ) that is provided below the central portion C. The right front portion Rf is provided with steps  31  for maintenance and a handrail  32 . 
         [0052]    The storage means  120 , the inverter circuits  18 A,  20 A, and  20 B, and the controller  30 , which are shown in  FIG. 2 , are installed in the right front portion Rf. Opening portions are formed at the lower portions of the left and right surfaces of the right front portion Rf, respectively, and the capacitor  19  of the storage means  120  is installed between the right opening portion  34  (see  FIG. 5 ) and the left opening portion  33 . That is, the left and right opening portions  34  and  33  are formed as vents through which air for cooling the capacitor  19  flows to the left and right. 
         [0053]      FIG. 5  is a cross-sectional view of a capacitor  19  and the like installed in the lower portion of the right front portion Rf as seen from the front side. A base frame B, which includes a bottom frame Ba and an outer peripheral frame Bb, is shown in  FIG. 5 . The bottom frame Ba is a frame member that forms the bottom of the house portion  4   b . The outer peripheral frame Bb is erected at the peripheral edge (the left side in  FIG. 5 ) of the bottom frame Ba. 
         [0054]    As shown in  FIG. 5 , louvers  36  and  35  are provided at the right front portion Rf inside the right and left opening portions  34  and  33 , respectively. Further, a capacitor box  80  including the capacitor  19  is provided between the louvers  35  and  36 , and is installed on the bottom frame Ba with seats  155  and vibration-proof rubbers  156  interposed therebetween. A plurality of cells  41  is arranged side by side on upper and lower stages and assembled, so that the capacitor  19  is formed. The assembly of the cells  41  of the upper stage forms an upper-stage module  45 , and the assembly of the cells  41  of the lower stage forms a lower-stage module  45 . These modules  45  and  45  are surrounded and reinforced by an outer frame so as to allow air to flow to the left and right, so that the capacitor box  80  is formed. 
         [0055]    An air intake duct  40  is connected to the right side (the left side in  FIG. 5 ) of the capacitor box  80 , and louvers  38  are provided at the upstream end portion in the air intake duct  40  so as to face the louvers  36 . Further, fans  43  and  43 , which make cooling air flow to the right from the left in  FIG. 5 , are provided at the left (right in  FIG. 5 ) end portion of the capacitor box  80  so as to correspond to the cells  41  and  41  of the upper and lower stages, respectively. Furthermore, an exhaust duct  39  is connected to the left side (the right side in  FIG. 5 ), and louvers  37  are provided at the downstream end portion in the exhaust duct  39  so as to face the louvers  35 . 
         [0056]    The louvers  36  corresponding to the air intake side are inclined downward relative to the flow direction of cooling air that flows to the right from the left in  FIG. 5 , and the louvers  38  provided in the air intake duct  40  on the downstream side of the louvers  36  are inclined upward so as to be opposite to the louvers  36 . In addition, the louvers  37  provided in the exhaust duct  39  are inclined downward relative to the flow direction of cooling air, and the louvers  35 , which correspond to the exhaust side and are provided on the downstream side of the louvers  37 , are inclined upward so as to be opposite to the louvers  37 . The capacitor box  80  is intended to be made waterproof by the above-mentioned structure of the louvers. 
         [0057]    Further, since the capacitor box  80  is installed on the bottom frame Ba as described above, the position where the capacitor box is installed is lower than the right and left opening portions  34  and  33 . For this reason, the air intake duct  40  and the exhaust duct  39  have an asymmetric shape in the vertical direction. That is, the air intake duct  40  and the exhaust duct  39  have a shape that extends downward from both the louvers  38  and  37  toward the capacitor box  80 . 
         [0058]    Furthermore, a partition wall  44 , which connects an upstream end portion formed between the upper-stage module  45  and the lower-stage module  45  to the downstream end portion of the louver  38  and partitions the inner space of the air intake duct  40  into upper and lower spaces, is provided in the air intake duct  40 . The partition wall  44  distributes the same amount of cooling air as the amount of cooling air, which is to be supplied to the upper-stage module  45 , to the lower-stage module  45  that is disposed so as to be shifted downward without exactly facing the louvers  38  arranged side by side in the vertical direction. The partition wall  44  is inclined downward relative to the flow direction of cooling air without being horizontal so that the flow rate of cooling air at a lower inlet is larger than the rate of cooling air at an upper inlet (an outlet of the louvers  38 ). 
         [0059]    Meanwhile, the capacitor box  80 , the air intake duct  40 , the exhaust duct  39 , the opening portion  34 , the opening portion  33 , and the like are installed at the right front portion Rf here, but may be installed at the left front portion Lf below the operator&#39;s cab  4   a.    
         [0060]    Further, coolers, such as a radiator for an engine, an oil cooler, an intercooler, a fuel cooler, a radiator for a hybrid system (a radiator for hybrid), and a heat exchanger for an air conditioner of the operator&#39;s cab  4   a  (a capacitor for an air conditioner) (none of which are shown), are installed in the left rear portion Lr of  FIG. 4 . 
         [0061]    Furthermore, the engine  11 , the transmission  13 , the electric 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 an engine hood H forming a top panel. A fan (not shown) is connected to the engine  11 . Accordingly, the fan is rotated by the rotation of the engine  11 , so that air flows into the left rear portion Lr from a vent  46  formed at the left side of the left front portion Lf. As a result, the above-mentioned respective coolers installed in the left rear portion Lr are cooled. 
         [0062]    So-called A-frames  47  that are frames where the boom  5  is supported and interposed so as to be capable of moving up and down, and a boom cylinder frame  48  that is a frame on which the base end of the boom cylinder  8  is mounted are provided at the central portion C. 
         [0063]    Next, a structure related to wires of high voltage cables of the electric generator  12  and the revolving electric motor  21  will be described in detail. 
         [0064]      FIG. 6  is a perspective view showing wires of high voltage cables  63 , which connect the revolving electric motor  21  to the inverter circuit  20 A thereof, together with the base frame B, the A-frames  47 , and components in the right front portion Rf of the house portion, and is a perspective view as seen from the rear upper side of the left portion of the vehicle;  FIG. 7  is a perspective view of  FIG. 6  as seen from the rear upper side of the right portion of the vehicle;  FIG. 8  is a plan view of  FIGS. 6 and 7 ;  FIG. 9  is a perspective view showing wires of high voltage cables  53 , which connect the electric generator  12  to the inverter circuit  18 A thereof, together with the base frame B, the A-frames  47 , and components in the right front portion Rf of the house portion, and is a perspective view as seen from the rear upper side of the left portion of the vehicle;  FIG. 10  is a perspective view of  FIG. 9  as seen from the rear upper side of the right portion of the vehicle;  FIG. 11  is a plan view of  FIGS. 9 and 10 ; and  FIG. 12  is a view taken along line XII-XII of  FIG. 11 . 
         [0065]    As shown in  FIGS. 6 and 7 , the capacitor box  80  to which the air intake duct  40  and the exhaust duct  39  are connected, the inverter circuits  18 A,  20 A, and  20 B, and the controller  30  are mounted on the bottom frame Ba in the right front portion Rf of the house portion from the lower side to the upper side. 
         [0066]    Further, a pump chamber (not shown) is formed in the house portion  4   b  on the base frame B at the right rear portion Rr and the transmission  13 , the electric generator  12 , and the main pump  14  are provided in the pump chamber. 
         [0067]    Furthermore, the A-frames (frame structural members)  47  and  47 , which support the boom  5 , are formed at the central portion C so as to protrude in the vertical direction and face each other, and the revolving electric motor  21  is provided near the rear portion of the boom  5  at the middle position interposed between the A-frames  47  and  47  so as to be substantially erected on the bottom frame Ba. 
         [0068]    Moreover, outer peripheral frames (side frames; frame structural members) Bb forming the base frame B are provided at both left and right end portions of the base frame B so as to extend in a longitudinal direction. As shown in  FIG. 12 , the outer peripheral frame Bb is formed in the shape of a rectangular tube that extends in the vertical direction, and a closed cross-sectional space S having a substantially rectangular cross-section is formed in the outer peripheral frame Bb. 
         [0069]    Here, as shown in  FIGS. 6 to 8 , the high voltage cables  63 , which connect the revolving electric motor  21  to the inverter circuit  20 A thereof and through which power is supplied, are wired along the inner side surface of the A-frame  47 . 
         [0070]    Specifically, an opening  88   a  through which the high voltage cables  63  corresponding to three phases (U, V, and W) pass is formed at the lower portion of the A-frame  47  facing the capacitor box  80  at a position close to the capacitor box  80 . The high voltage cables  63  extending from the revolving electric motor  21  are laid along the inner surface of the lower portion of the A-frame  47  that protrudes in the vertical direction on the side close to the capacitor box  80 , are led to the outside of the A-frame  47  through the opening  88   a , and are connected to three-phase terminals  64  of the inverter circuit  20 A, respectively. 
         [0071]    Further, as shown in  FIGS. 9 to 12 , the high voltage cables  53 , which connect the electric generator  12  to the inverter circuit  18 A thereof and through which power is supplied, are wired so as to pass through the outer peripheral frame Bb. 
         [0072]    Specifically, openings  89   a  and  89   b  through which the high voltage cables  53  corresponding to three phases (U, V, and W) pass are formed at the outer peripheral frame Bb, which faces the electric generator  12  and the capacitor box  80 , at a position corresponding to the side of the electric generator  12  and a position close to the capacitor box  80 , respectively. The high voltage cables  53  extending from the electric generator  12  are introduced into the outer peripheral frame Bb through the opening  89   a , pass through the closed cross-sectional space S formed in the outer peripheral frame, are laid along the side surfaces of inner and outer walls of the outer peripheral frame Bb protruding in the vertical direction, are led to the outside of the outer peripheral frame Bb through the opening  89   b , and are connected to three-phase terminals  54  of the inverter circuit  18 A, respectively. 
         [0073]    Since the high voltage cables  53  and  63  are wired along the side surfaces of the frame structural members Bb and  47  protruding in the vertical direction in this embodiment as described above, the frame structural members Bb and  47  become upright walls, so that the high voltage cables  53  and  63  are adequately protected. Accordingly, for example, even when the lifting magnet vehicle  1  collides with an obstruction or the like, the high voltage cables  53  and  63  are adequately protected by the frame structural members Bb and  47 . As a result, safety is improved. 
         [0074]    Further, since the high voltage cables  63  forming the frame structural member are wired along the inner side surface of the A-frame  47 , the high voltage cables  63  are adequately protected by the A-frame  47  having high rigidity. Accordingly, safety is improved. In addition, even when the lifting magnet vehicle  1  collides with an obstruction or the like, the A-frame  47  is separated from a collision portion since being disposed at the central portion. Accordingly, the high voltage cables  63  are more adequately protected. 
         [0075]    Moreover, since the high voltage cables  53  forming the frame structural member pass through the outer peripheral frame Bb that has high rigidity and forms a closed cross-section, the high voltage cables  53  are adequately protected, so that safety is improved. Further, the outer peripheral frame Bb surrounding the high voltage cables  53  is made of metal, so that the outer peripheral frame Bb blocks electromagnetic waves. Accordingly, electromagnetic shielding performance is also improved. 
         [0076]    In addition, the high voltage cables  53  and  63  can be wired separately from a control harness having a low voltage (for example, 24 V) connected to the controller  30  or the like, it is possible to reduce noise that is generated on the harness by the high voltage cables  53  and  63 . 
         [0077]    Meanwhile, a waterproof cap (not shown) is provided at portions of the high voltage cables  63  penetrating a frame of the revolving electric motor  21  and a waterproof cap (not shown) is provided at portions of the high voltage cables  53  penetrating a frame of the electric generator  12  so that the frames are sufficiently intended to be made waterproof. For example, a waterproof cap, which is made of a fluororesin and has heat resistance, may be used as these waterproof caps. 
         [0078]      FIG. 13  is a perspective view showing main portions of a construction machine according to a second embodiment of the invention; is a perspective view showing wires of high voltage cables  53 , which connect an electric generator  12  to an inverter circuit  18 A thereof, together with a base frame B, A-frames  47 , and components in a right front portion Rf of a house portion; and is a perspective view as seen from the rear upper side of a left portion of a vehicle.  FIG. 14  is a perspective view of  FIG. 13  as seen from the rear upper side of a right portion of a vehicle, and  FIG. 15  is a plan view of  FIGS. 13 and 14 . 
         [0079]    This second embodiment is different from the first embodiment in that the wires of high voltage cables  53  are wired along the inner side surface of the A-frame  47 . 
         [0080]    Specifically, an opening  88   b  through which the high voltage cables  53  pass is formed at the lower portion of the A-frame  47  facing the electric generator  12  at a position corresponding to the side of the electric generator  12 . The high voltage cables  53  extending from the electric generator  12  are led to the inside of the A-frame  47  facing the electric generator  12  through the opening  88   b , are laid along the inner surface of the lower portion of the A-frame  47 , are led to the outside of the A-frame  47  through the above-mentioned opening  88   a , and are connected to terminals  54  of the inverter circuit  18 A, respectively. 
         [0081]    It goes without saying that the same operation and effect as the operation and effect of the high voltage cables  63  described in the first embodiment are obtained even in this second embodiment. 
         [0082]    Meanwhile, although not described here, high voltage cables  63 , which connect a revolving electric motor  21  to an inverter circuit  20 A, may be wired so as to pass through an outer peripheral frame Bb. 
         [0083]    Further, in the above-mentioned first and second embodiments, the high voltage cables  53  between the electric generator  12  and the inverter circuit  18 A thereof or the high voltage cables  63  between the revolving electric motor  21  and the inverter circuit  20 A thereof are wired along the inner side surface of the A-frame  47  or are wired so as to pass through the outer peripheral frame Bb. However, in the cases of an electric generator with an inverter and a revolving electric motor with an inverter that are obtained by attaching the inverter circuits  18 A and  20 A to the electric generator  12  and the revolving electric motor  21 , respectively, high voltage cables connecting the inverter circuit  18 A to the storage means  120  and high voltage cables connecting the inverter circuit  20 A to the storage means  120  are wired along the inner side surface of the A-frame  47  or are wired so as to pass through the outer peripheral frame Bb. 
         [0084]      FIG. 16  is a block diagram showing the internal structure of an electrical system, a hydraulic system, and the like of a construction machine according to another embodiment. 
         [0085]    A structure shown in  FIG. 16  is a so-called series type, is separately provided with an electric motor  140  for a pump and an inverter  18 D instead of the structure, which connects the transmission  13  to the main pump  14 , in the parallel type structure shown in  FIG. 2 ; converts the entire power of the engine  11  into electrical energy once; and drives various drive elements. 
         [0086]    Specifically, the inverter  18 D is electrically connected to the DC bus  110  (see  FIG. 3 ) of the storage means  120  and is controlled by the controller  30 . Further, an output end of the inverter  18 D is connected to the electric motor  140  for a pump, and the electric motor  140  for a pump is driven and controlled by the inverter  18 D. Furthermore, power, which is generated by the main pump  14  in the electric motor  140  for a pump, is supplied to the storage means  120  through the inverter  18 D as regenerated energy. 
         [0087]    The invention has been specifically described above with reference to the embodiments thereof, but the invention is not limited to the above-mentioned embodiments. For example, in the above-mentioned embodiments, the invention has been applied to a lifting magnet type hybrid construction machine as a particularly preferred example. However, the invention may be applied to other construction machines such as a shovel, a wheel loader, or a crane. 
       INDUSTRIAL APPLICABILITY 
       [0088]    According to the invention, it is possible to improve the safety of wires in a construction machine. 
       REFERENCE SIGNS LIST 
       [0000]    
       
         
           
               1 : lifting magnet vehicle (construction machine) 
               5 : boom 
               11 : engine 
               12 : electric generator (power generation means) 
               18 A,  20 A: inverter 
               21 : revolving electric motor (electric drive means) 
               47 : A-frame (frame structural member) 
               53 ,  63 : high voltage cable 
               120 : storage means 
             B: base frame 
             Bb: outer peripheral frame (side frame; frame structural member) 
             S: closed cross-sectional space

Technology Classification (CPC): 4