Power transmission device for hybrid vehicle

A power transmission device for a hybrid vehicle comprising:

• an engine configured to generate power;
• an input connected with the engine and configured to provide power with different gear ratios;
• a first motor generator driven when power is applied;
• a first transmission connected with the first motor generator, positioned parallel to the input, and configured to transmit power to the input;
• an output engaged with the input;
• a second motor generator driven when power is applied;
• a second transmission connected with the second motor generator, positioned parallel to the output, and configured to transmit power to the output;
• and
• a differential engaged with the output and configured to provide power to wheels,
• wherein the input comprises:
• an input shaft connected with the engine;
• a constant input gear constantly connected with the input shaft and engaged with the first transmission;
• and
• at least one optional input gear connected with the input shaft and engaged with the output,
• wherein the at least one optional input gear comprises:
• a first optional gear concentrically positioned with the input shaft and engaged with the output;
• a second optional gear connected with the first optional gear, engaged with the output, and configured to have a different gear ratio than the first optional gear;
• a third optional gear concentrically positioned with the input shaft, engaged with the output, and configured to have a different gear ratio than the first optional gear and the second optional gear;
• and
• a fourth optional shift provided on the input shaft and engaged with the second optional gear and the third optional gear, and
• wherein the output comprises:
• an output shaft positioned between the input and the second transmission;
• a first output transmission gear concentrically positioned with the output shaft and connected with the first optional gear;
• a second output transmission gear concentrically positioned with the output shaft and connected with the second optional gear;
• a third output transmission gear provided on the output shaft and configured to connect the third optional gear and the second transmission;
• a fourth output shift provided on the output shaft and engaged with the first output transmission gear and the second output transmission gear;
• and
• an output differential gear provided on the output shaft and connected with the differential.