| 摘要 |
There is provided a power transmission system which is capable of positively preventing a feeling of inertia travel from being caused by torque transmission interruption which conventionally occurred when a dog clutch is engaged in shifting the speed position of a transmission, without increasing the axial length of a transmission, thereby improving the speed position-shifting performance of the transmission. The transmission of the power transmission system includes a plurality of gear pairs for three or more speed positions, formed by input gears arranged on an input shaft, and output gears arranged on an output shaft, respectively, and synchromeshes of a dog clutch type for connecting the plurality of gear pairs to the input shaft or the output shaft. A driving force assist mechanism for supplying the driving force of a prime mover to the output shaft during a shift in speed position as a supplemental driving force has an auxiliary shaft arranged in parallel with the input shaft and the output shaft, an intermediate gear connected to the input shaft and integrally formed with the auxiliary shaft, auxiliary gears connected to the output shaft and rotatably arranged on the auxiliary shaft, and an assist clutch for fastening one of the auxiliary gears to the auxiliary shaft during the shift in speed position, thereby transmitting the driving force to the output shaft via the auxiliary shaft and the fastened auxiliary gear. |
