Continuously variable transmission
First Claim
Patent Images
1. A force generator for a continuously variable transmission, the force generator comprising:
- a first disc having a threaded bore;
a first set of ramps coupled to the first disc near an outer diameter of the first disc;
a plurality of bearings adapted to engage the first set of ramps;
a second set of ramps, the second set of ramps operably coupled to an outer diameter of a power transfer disc of the transmission and adapted to engage the bearings;
a rotatable screw adapted to engage the threaded bore;
a third set of ramps, the third set of ramps operably coupled to the screw; and
a fourth set of ramps, the fourth set of ramps operably coupled to the power transfer disc and adapted to engage the third set of ramps.
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Abstract
A variable speed transmission having a plurality of tilting balls and opposing input and output discs is illustrated and described that provides an infinite number of speed combinations over its transmission ratio range. The use of a planetary gear set allows minimum speeds to be in reverse and the unique geometry of the transmission allows all of the power paths to be coaxial, thereby reducing overall size and complexity of the transmission in comparison to transmissions achieving similar transmission ratio ranges.
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Citations
20 Claims
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1. A force generator for a continuously variable transmission, the force generator comprising:
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a first disc having a threaded bore; a first set of ramps coupled to the first disc near an outer diameter of the first disc; a plurality of bearings adapted to engage the first set of ramps; a second set of ramps, the second set of ramps operably coupled to an outer diameter of a power transfer disc of the transmission and adapted to engage the bearings; a rotatable screw adapted to engage the threaded bore; a third set of ramps, the third set of ramps operably coupled to the screw; and a fourth set of ramps, the fourth set of ramps operably coupled to the power transfer disc and adapted to engage the third set of ramps. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of generating axial force in a continuously variable transmission, the method comprising:
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providing a first disc having a threaded bore; coupling a first set of ramps to the first disc near an outer diameter of the first disc; providing a plurality of bearings adapted to engage the first set of ramps; coupling a second set of ramps to an outer diameter of a power transfer disc of the transmission, wherein the second set of ramps is adapted to engage the bearings; providing a rotatable screw adapted to engage the threaded bore; coupling a third set of ramps to the screw; and coupling a fourth set of ramps to the power transfer disc, wherein the fourth set of ramps are adapted to engage the third set of ramps. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification