Hybrid industrial vehicle

A hybrid industrial vehicle, comprising:

• an engine;
• a battery;
• a first electric motor actuated when supplied with electric power from the battery;
• a first gear train configured to transmit power of the first electric motor and power of the engine to a drive wheel through the first gear train;
• a second electric motor actuated when supplied with electric power from the battery;
• a first hydraulic pump supplying pressure oil to a cargo-handling hydraulic system;
• a second gear train interposed among the engine, the second electric motor and the first hydraulic pump and mutually transmits power among the engine, the second electric motor and the first hydraulic pump;
• a second hydraulic pump supplying pressure oil to a steering hydraulic system;
• and
• a third electric motor actuated to drive the second hydraulic pump when supplied with electric power from the battery,
• wherein an accumulator is provided to a hydraulic line through which pressure oil is supplied from the second hydraulic pump to the steering hydraulic system.

A hybrid industrial, comprising:

• an engine;
• a battery;
• a first electric motor actuated when supplied with electric power from the battery;
• a first gear train configured to transmit power of the first electric motor and power of the engine to a drive wheel through the first gear train;
• a second electric motor actuated when supplied with electric power from the battery;
• a first hydraulic pump supplying pressure oil to a cargo-handling hydraulic system;
• a second gear train interposed among the engine, the second electric motor and the first hydraulic pump and mutually transmits power among the engine, the second electric motor and the first hydraulic pump;
• a second hydraulic pump supplying pressure oil to a steering hydraulic system;
• and
• a third electric motor actuated to drive the second hydraulic pump when supplied with electric power from the battery,
• wherein
• a first hydraulic line through which pressure oil is supplied from the first hydraulic pump to the cargo-handling hydraulic system and a second hydraulic line through which pressure oil is supplied from the second hydraulic pump to the steering hydraulic system are connected to each other by a third hydraulic line, and
• the third hydraulic line is provided with a directional control valve switchable between a first state of allowing the first hydraulic line to communicate with the second hydraulic line, and a second state of allowing the first hydraulic line to communicate with a fourth hydraulic line communicating with an oil tank.

A hybrid industrial vehicle, comprising:

• an engine;
• a battery;
• a first electric motor actuated when supplied with electric power from the battery;
• a first gear train configured to transmit power of the first electric motor and power of the engine to a drive wheel through the first gear train;
• a second electric motor actuated when supplied with electric power from the battery;
• a first hydraulic pump supplying pressure oil to a cargo-handling hydraulic system;
• a second gear train interposed among the engine, the second electric motor and the first hydraulic pump and mutually transmits power among the engine, the second electric motor and the first hydraulic pump;
• a second hydraulic pump supplying pressure oil to a steering hydraulic system;
• and
• a third electric motor actuated to drive the second hydraulic pump when supplied with electric power from the battery,
• wherein
• a first hydraulic line and a second hydraulic line are connected to each other through a directional control valve, so that pressure oil, which is discharged from the first hydraulic pump to the first hydraulic line, and pressure oil, which is discharged from the second hydraulic pump to the second hydraulic line, are merged and then supplied to the cargo-handling hydraulic system and the steering hydraulic system, and
• the directional control valve is switchable between a first state of allowing the first hydraulic line to communicate with the second hydraulic line and a second state of allowing the first hydraulic line to communicate with a third hydraulic line communicating with an oil tank.