Power transmission apparatus

A power transmission apparatus being characterized in that it comprises:

• an input shaft into which rotary powers are input;
• a first output shaft and a second output shaft into which said rotary powers are input by way of said input shaft, and whose axial directions are put in place parallelly to an axial direction of said input shaft;
• a first gear set having two change-speed stages with distinct change gear ratios, and a change-speed stage selector device;
• the two change-speed stages comprising:
• two first-input-shaft gears being capable of rotating integrally with respect to said input shaft, and being disposed adjacently to each other axially;
• and two first-output-shaft gears being disposed so as to be capable of rotating idly with respect to said first output shaft so that they always mesh with each of said two first-input-shaft gears;
• the change-speed stage selector device being capable of rotating integrally with respect to said first output shaft and being positioned between said two first-output-shaft gears, the change-speed stage selector device comprising:
• a change-speed stage selection state in which it is connected to either one of said two first-output-shaft gears to be capable of rotating integrally therewith;
• and a neutral state in which it is not connected to any one of said two first-output-shaft gears to be capable of rotating integrally therewith;
• a second gear set having two change-speed stages with distinct change gear ratios, and a change-speed stage selector device:
• the two change-speed stages comprising:
• two second-input-shaft gears being capable of rotating integrally with respect to said input shaft, and being disposed adjacently to each other axially;
• and two second-output-shaft gears being disposed so as to be capable of rotating idly with respect to said second output shaft so that they always mesh with each of said two second-input-shaft gears;
• the change-speed stage selector device being capable of rotating integrally with respect to said second output shaft and being positioned between said two second-output- shaft gears, the change-speed stage selector device comprising:
• a change-speed stage selection state in which it is connected to either one of said two second-output-shaft gears to be capable of rotating integrally therewith;
• and a neutral state in which it is not connected to any one of said two second-output-shaft gears to be capable of rotating integrally therewith;
• and
• one of said first-input-shaft gears for said change-speed stages of said first gear set is positioned between said two second-input-shaft gears of said second gear set in the axial direction of said input shaft.