Toroidal continuously variable transmission

摘要

In a toroidal continuously variable transmission, a secondary oil pump (22) is provided in addition to a primary oil pump (21) driven by an engine. The secondary oil pump (22) is driven in response to rotation of a road wheel. A hydraulic servo mechanism (13) is connected to a trunnion (12) to create an offset of the power roller from a neutral position for a tilting motion of the power roller. A feedback device is provided for feeding a degree of progress for ratio changing back to the hydraulic servo mechanism so that the power roller returns to the neutral position when a desired transmission ratio has been reached. When the road wheel is rotated in a stopped state of the engine, hydraulic pressure from the secondary oil pump is supplied to the hydraulic servo mechanism so that an actual transmission ratio is brought closer to a desired transmission ratio.