Power train system for hybrid electric vehicle

A power train system for a hybrid electric vehicle, the power train system comprising:

• an engine;
• a first motor operating as a motor for driving the vehicle or operating as an electric generator by an engine power;
• a first power transmission mechanism connected between the engine and the first motor and transmitting the engine power to the first motor;
• a second power transmission mechanism connected between the first motor and a driving shaft of traveling wheels and transmitting the engine power transmitted to the first motor or the engine power and power from the first motor to the driving shaft of the traveling wheels, or blocking power from being transmitted between the first motor and the driving shaft of the traveling wheels;
• and
• a second motor connected to the second power transmission mechanism by a third power transmission mechanism to transmit power to the second power transmission mechanism, the second motor outputting power for driving the vehicle and transmitting the power to the driving shaft of the traveling wheels through the third power transmission mechanism and the second power transmission mechanism,
• wherein the first power transmission mechanism includes:
• an engine side gear installed on an output shaft of the engine;
• a first intermediate gear installed on a first power transmission shaft and meshed with the engine side gear;
• a second intermediate gear installed on the first power transmission shaft coaxially with the first intermediate gear;
• and
• a power transmission gear for the first motor installed on a rotating shaft of the first motor and meshed with the second intermediate gear.