Cargo handling apparatus of cargo handling industrial vehicle

A cargo handling apparatus of a cargo handling industrial vehicle, comprising:

• an engine;
• a generator-motor;
• a clutch for connecting/disconnecting a transmission of power between the engine and the generator-motor;
• electric storage means connected to the generator-motor;
• cargo handling means for performing cargo handling work;
• load detection means for detecting an amount of a cargo handling load;
• and
• a controller,
• wherein the generator-motor is driven in one of:
• a generator mode of generating electric power by being driven by power of the engine transmitted through the clutch and storing the electric power in the electric storage means;
• and a motor mode of being driven as a motor by receiving a supply of electric power from the electric storage means,
• when the load detected by the load detection means is smaller than a predetermined value, the controller sets the engine in a stopped or idle state, disconnects the transmission of the power between the engine and the generator-motor by the clutch, and drives the cargo handling means by the generator-motor in the motor mode, thereby performing the cargo handling work;
• when the load detected by the load detection means becomes the predetermined value or more during the cargo handling work in a state where the transmission of the power between the engine and the generator-motor is disconnected by the clutch, the controller starts an increase of the number of revolution of the engine while increasing an output of the generator-motor in the motor mode, and when the number of revolution of the engine is made equal to the number of revolution of the generator-motor, the controller connects the transmission of the power between the engine and the generator-motor by the clutch, and drives the cargo handling means by both of the power of the engine and the power of the generator-motor, thereby performing the cargo handling work.