| 摘要 |
[Assignment] To provide a power transmission apparatus for hybrid vehicle, power transmission apparatus which can not only carry out change-speed operations smoothly without ever interrupting the transmission of rotary power while making use of the merit of using a plurality of motors combinedly, and which is but also smaller in size, lighter in weight and more inexpensive than conventional ones; and then to provide a method of change-speed operation for the same. [Means for Solution] It is equipped with: a power switcher mechanism 2 for selectively transmitting a rotary power of a primary motor (e.g., engine 91; a first input shaft 3, and a second input shaft 4, the first input shaft 3 and the second input shaft 4 that are coupled to the power switcher mechanism 2 selectively, the first input shaft 3 being further connected with a secondary motor (e.g., electric motor 94), the second input shaft 4 being not connected with the secondary motor 94; a plurality of gear trains 51-55 and 5R being placed so that the first input shaft 3 or the second input shaft 4 makes the origin, and making engagements selectively, thereby not only transmitting the rotary power but also exhibiting change-speed ratios that differ one another; an output shaft 6 for outputting the rotary power that the gear trains 51-55 and 5R transmit; and an operation controller unit 7 for not only controlling a revolving speed of the primary motor 91 and that of the secondary motor 94 but also operating to switch the power switcher mechanism 2.
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