Toroidal continuously variable transmission
First Claim
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1. A toroidal continuously variable transmission, comprising:
- an input disk having a rotation axis;
an output disk having the same rotation axis as said input disk;
a power roller in contact with said input disk and output disk for transmitting a rotational torque between the disks;
a trunnion for supporting said power roller, said trunnion having a trunnion axis perpendicular to said rotation axis;
an oil pressure drive device for varying a contact point between said power roller and said input disk and output disk by displacing said trunnion within a predetermined range along the trunnion axis; and
a limiting member for limiting the displacement of said trunnion in the direction of said trunnion axis, when a rotation torque is input from said output disk to said power roller,wherein said limiting member produces an elastic resistance against a direction of the displacement of said trunnion when there is no oil pressure from the oil pressure drive device and the rotation torque is input from said output disk to said power roller.
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Abstract
When a vehicle comprising a toroidal continuously variable transmission is pulled or run under its own inertia when the engine has stopped, the rotation torque of the drive wheels varies a gyration angle of a power roller (44FR, 44FL, 44RR, 44RL) via an output disk (18, 20) in a direction so as to reduce a speed ratio. This decrease of speed ratio reduces starting performance when the vehicle is restarted by the engine. This invention suppresses the variation of gyration angle by a spring (100) which limits the displacement of a trunnion (46FR, 46FL, 46RR, 46RL) supporting the power roller (44FR, 44FL, 44RR, 44RL).
224 Citations
8 Claims
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1. A toroidal continuously variable transmission, comprising:
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an input disk having a rotation axis; an output disk having the same rotation axis as said input disk; a power roller in contact with said input disk and output disk for transmitting a rotational torque between the disks; a trunnion for supporting said power roller, said trunnion having a trunnion axis perpendicular to said rotation axis; an oil pressure drive device for varying a contact point between said power roller and said input disk and output disk by displacing said trunnion within a predetermined range along the trunnion axis; and a limiting member for limiting the displacement of said trunnion in the direction of said trunnion axis, when a rotation torque is input from said output disk to said power roller, wherein said limiting member produces an elastic resistance against a direction of the displacement of said trunnion when there is no oil pressure from the oil pressure drive device and the rotation torque is input from said output disk to said power roller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification