| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a motor output gear ratio decision method of a transmission for a hybrid vehicle which eliminates a risk of a resonance phenomenon of an input shaft by deciding a proper gear ratio of a motor gear row, and contributes to the size reduction and cost reduction of a motor.SOLUTION: A method decides a gear ratio I which is obtained by dividing a tooth number of a motor-side driven gear with a tooth number of a motor-side drive gear in a transmission for a hybrid vehicle which comprises an input shaft 2, an output shaft 3, a plurality of gear change gear rows which are arranged correspondingly to a plurality of gear change stages, and a motor gear row arranged at the motor-side drive gear which is rotationally driven to the motor 8, and the input shaft 2, and formed of the motor-side driven gear which is engaged with the motor-side driven gear directly or via the other gear. The gear ratio I is decided so that a resonance rotation number of a rotating shaft of an engine 7 calculated from a resonance frequency of the input shaft 2 which changes depending on the inertia (engine-side inertial J1) of the engine 7 and the inertia J2 of the motor 8 reaches an idling rotation number or smaller.</p> |
