Hybrid-type working machine

A hybrid-type working machine, comprising:

• an automotive vehicle body provided with a working mechanism in a front side of said vehicle body;
• a counterweight that is provided in a rear side of said vehicle body to act as a weight balance to said working mechanism;
• an engine that is arranged at a front side of said counterweight to drive a hydraulic pump;
• an electric motor including a first electric motor that is driven by said engine to generate power or assists in a drive of said engine by supply of power thereto and a second electric motor that is driven by power supplied from said electricity storage device aside from said first electric motor or stores regeneration power generated by a regeneration operation in said electricity storage device;
• a heat exchanger for cooling a fluid including engine cooling water and/or hydraulic oil;
• a cooling fan for supplying cooling air to said heat exchanger;
• an electricity storage device that is arranged in a heat exchanger upstream room upstream of said heat exchanger in a flow direction of the cooling air supplied to said heat exchanger and stores power or discharges the power therein;
• an inverter device having a first inverter for controlling an operation of said first electric motor and a second inverter for controlling an operation of said second electric motor;
• a radiator for the electricity storage device that cools said electricity storage device;
• and
• a radiator for the inverter that is provided aside from said radiator for the electricity storage device to cool said inverter device, wherein
• said radiator for the electricity storage device and said radiator for the inverter are positioned between said heat exchanger and said electricity storage device in said heat exchanger upstream room, and are arranged in parallel in the flow direction of said cooling air,
• a connecting box is provided on an upper surface side of said electricity storage device for connection between a first cable extending from said first inverter, a second cable extending from said second inverter, and a terminal of said electricity storage device, respectively,
• a first cable connecting port to which said first cable is connected and a second cable connecting port to which said second cable is connected, are provided on a front side surface of the connecting box aligned in a left-right direction,
• a signal line connecting port to which a signal line from a control device for controlling charge or discharge by said electricity storage device is connected is provided on a rear side surface of said connecting box opposite said front side surface,
• said radiator for the inverter and said radiator for the electricity storage device include upper tanks which receive a coolant to be cooled, lower tanks which receive cooled coolant, and heat radiation parts provided between said upper tanks and said lower tanks to release heat of the coolant into the cooling air, and
• a lower end part of said heat radiation part in said radiator for the inverter and a lower end part of said heat radiation part in said radiator for the electricity storage device are arranged in a height equal to or higher than a height of an upper surface of said connecting box.