Patent ID: 7081060
Filing Date: 2006-07-25
Classification: B60K,B60L,B60W,F16H,Y02T

Abstract:
1. A power transmission system, comprising: an engine; an electric motor; a power synthesizing mechanism for synthesizing powers outputted from the engine and the electric motor, which includes a first planetary gear mechanism having a first sun gear, a first ring gear arranged on the outer side of said first sun gear, and a first carrier for holding a first pinion gear meshing with said first sun gear and said first ring gear; a power generator having a fixed stator and an output portion connected to an input portion of the synthesizing mechanism; a speed change mechanism for changing the rotating speed of said electric motor to transmit a torque of the electric motor to said power synthesizing mechanism, which includes a second planetary gear mechanism having a second sun gear, a second ring gear arranged on the outer side of said second sun gear, and a second carrier for holding a second pinion gear meshing with said second sun gear and said second ring gear; an arranging region for said electric motor and an arranging region for said power generator in the axial directions of the output shaft of said electric motor and the rotary shaft of said power generator, a fixing mechanism for increasing the torque of said electric motor by fixing any of said second sun gear, said second ring gear and said second carrier, to transmit the increased torque to said power synthesizing mechanism; wherein said arranging regions do not overlap on each other; the first carrier of said first planetary gear mechanism and the engine are connected to each other; said electric motor and the second sun gear of said second planetary gear mechanism are connected to each other; the second carrier of said second planetary gear mechanism is fixed, and the first ring gear of said first planetary gear mechanism and the second ring gear of said second planetary gear mechanism are connected to each other.