Patent ID: 7034481

Claim:
A power transmission device for a hybrid vehicle, comprising: a first power distributor and a second power distributor, each of the first and second power distributors which receives, at an input shaft, a rotational driving force from an engine; a power output shaft for receiving the rotational driving force from a first output shaft of two output shafts of said first power distributor and a first output shaft of two output shafts of said second power distributor and outputting the received rotational driving force to driving wheels of the vehicle; a first motor for supplying a driving torque or regenerative torque to a second output shaft of said first power distributor; and a second motor for supplying a driving torque or regenerative torque to a second output shaft of said second power distributor; and a first rotation transmission system from said engine to said power output shaft via said first power distributor and a second rotation transmission system from said engine to said power output shaft via said second power distributor wherein the first rotation transmission system from said engine to the first output shaft of the first power distributor via the input shaft thereof and the second rotation transmission system from said engine to the first output shaft of the second power distributor via the input shaft thereof are configured with different speed reduction ratio values, a first speed change unit for switching the speed reduction ratio from the first output shaft of the first power distributor to the power output shaft at a plurality of stages is provided with at least a the first rotation transmission system on the side of the first power distributor of the rotation transmission system from the first output shaft of the first power distributor to the power output shaft and the second rotation transmission system from the first output shaft of the second power distributor to the power output shaft, and the second rotation transmission system from the first output shaft of the second power distributor to the power output shaft achieves rotation transmission from the first output shaft of the second power distributor to the power output shaft via a rotational member of at least one of rotation transmission mechanisms for the stages of the first speed change unit, the rotational member being arranged concentrically with the power output shaft.