Power transmission apparatus for a hybrid vehicle and a method for controlling the apparatus

Abstract

The object of the present invention is to provide a power transmission apparatus which enables a shifting with high efficiency and small shock. A power transmission apparatus for a hybrid vehicle having two driving means; an engine and a motor generator, including; a planetary gear unit including at least a sun gear, a carrier and a ring gear; and a counter shaft for transmitting power to driving wheels of a vehicle, wherein the rotor of the motor generator is connected to the sun gear, an engine output shaft and a first main shaft which is capable of transmitting torque to the counter shaft through gears in a plurality of transmission gear ratios are connected to the carrier, and torque of the ring gear can be transmitted through gears to a second main shaft which is capable of transmitting torque to the counter shaft through gears in a plurality of transmission gear ratios.

Dependencies are inferred from the claim text.