| 摘要 |
The toroidal continuous variable transmission has a viscous clutch installed between the output disks to allow their rotation difference even when there is a difference in the transmission ratio between the two toroidal speed change units. If the transmission ratio difference increases, the viscous clutch causes the two units to synchronize with each other, thus preventing the two speed change units from remaining unequal in the transmission ratio. Further, when the transmission ratio difference between the two toroidal speed change units is small, the toroidal continuous variable transmission has a function to self-synchronize the two units. When the transmission ratio difference becomes large, the differential mechanism is activated to prevent seizure due to interlocking or slippage. With this toroidal speed change unit, when an electrical failure occurs, it is possible to fix the transmission ratio to a predetermined value on the low-speed side according to the driver's selection of gearshift position so as to ensure safe driving while running with a heavy load on a descending slope by preventing sudden application of engine braking while traveling at high speed.
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