Power transmission mechanism

A power transmission mechanism that connects at least one of an engine and an electric motor to drive wheels, thereby transmitting a driving force from the at least one of the engine and the electric motor to the drive wheels,

• the power transmission mechanism comprising:
• a multi-stage transmission including an input shaft connected to the engine and an output shaft connected to the drive wheels, said input shaft and said output shaft having a plurality of change gears arranged thereon which are selectively caused to mesh with each other, thereby transmitting the driving force from the engine to the drive wheels, such that a transmission gear ratio can be stepwise changed and at the same time said input shaft and said output shaft can be disconnected from each other, said multi-stage transmission having an input shaft gear and an output shaft gear on said input shaft and said output shaft, respectively;
• a drive shaft driven by the electric motor;
• a first gear and a second gear arranged on said drive shaft;
• and
• a switching mechanism for selectively switching a connection mode of the electric motor between an output shaft connection mode in which the electric motor is connected to said output shaft by meshing of said first gear with said output shaft gear, and an input shaft connection mode in which the electric motor is connected to said input shaft by meshing of said second gear with said input shaft gear.