Hybrid system and working machine including hybrid system

A hybrid system comprising:

• an engine;
• a generator to be driven by the engine;
• an electric actuator to be driven by electricity generated by the generator;
• a transmission to transmit power from the engine;
• a hydraulic pump to receive power from the engine through the transmission to deliver hydraulic fluid;
• and
• a hydraulic actuator to be driven by hydraulic fluid delivered by the hydraulic pump;
• wherein
• the transmission includes:
• a first transmission path to transmit power from the engine to the hydraulic pump when a rotational speed of the engine is a first rotational speed;
• and
• a second transmission path to transmit power from the engine to the hydraulic pump at a speed change ratio at which a rotational speed is increased to a greater degree than at a speed change ratio of the first transmission path when the rotational speed of the engine is a second rotational speed that is lower than the first rotational speed;
• and
• a third transmission path to transmit power from the engine to the generator;
• the first transmission path and the second transmission path are connected to the third transmission path, and the generator and the hydraulic pump are connected in series to the engine;
• the third transmission path includes:
• a transmission assembly to transmit power from an output shaft of the engine to an input shaft of the generator, the transmission assembly being connected to the output shaft;
• and
• a transmission shaft to transmit power from the output shaft to the first transmission path and the second transmission path, the transmission shaft being connected to the output shaft;
• and
• the input shaft is hollow, and the transmission shaft extends through an interior of the input shaft.