| 摘要 |
PURPOSE: To improve the safety and acceleration on a slippery road by giving predetermined difference in speed between two driven output members when front and rear wheels rotate at the same speed and engaging a clutch immediately after this difference in speed ends. CONSTITUTION: An output shaft 86 drives by making a front wheel follow a rear wheel. A hub member 92 of this output shaft 86 and a second gear part 74 of a sun gear element 44 are connected with a force transmission device 94 to constitute in such a way that the sun gear element 44 overruns relative to an output member. That is, when front and rear wheels rotate at the same speed, the sun gear element 64 rotates faster by several % than the rotation of an output element 64. When a difference in speed between the output members of a gear set disappears, a two directional overrunning clutch of a drive device 42 is operated and engaged immediately to complete a second torque transmission system. Consequently, it is possible to ensure the acceleration and safety on a slippery road due to this configuration.
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