Continuously variable transmission
First Claim
Patent Images
1. A shift guide for a continuously variable transmission (CVT), the shift guide comprising:
- a disc-shaped body;
a side on the disc-shaped body having a curve defined at least in part by a radius of a power adjuster ball of the CVT.
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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
19 Claims
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1. A shift guide for a continuously variable transmission (CVT), the shift guide comprising:
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a disc-shaped body; a side on the disc-shaped body having a curve defined at least in part by a radius of a power adjuster ball of the CVT. - View Dependent Claims (2, 3, 4, 5)
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6. A method of determining a curve for a shift guide of a continuously variable transmission (CVT), the method comprising the steps of:
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storing information associated with a radius of a power adjuster ball of the CVT; and determining x-, y-coordinates of the curve based at least in part on the stored radius of the power adjuster ball. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A method of determining a convex curve of a shift guide used in a shifting mechanism having a power adjuster ball, a tiltable axis about which the power adjuster ball rotates, an idler in contact with the power adjuster ball, a guide wheel in contact with the shift guide, and a leg operably coupling the guide wheel and the power adjuster ball, the method comprising the steps of:
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storing information associated with at least a radius of the ball, a radius of the idler, and a width of the idler; defining a center of the ball as a fixed location; determining x-, y-coordinates of the convex curve based at least in part on the fixed location, the radius of the ball, the radius of the idler, and the width of the idler. - View Dependent Claims (13, 14, 15)
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16. A method of determining a convex curve for a shift guide used in a shifting mechanism having a power adjuster ball, a tiltable axis about which the power adjuster ball rotates, an idler in contact with the power adjuster ball, and a guide wheel in contact with the shift guide, the method comprising the steps of:
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defining a two-dimensional coordinate system with an origin located at a center of the idler; defining a center of the ball as a fixed location in the two-dimensional system; and defining variables in the two-dimensional coordinate system for characterizing physical dimensions of the shifting mechanism, the variables including at least a radius of the power adjuster ball and a width of the idler. - View Dependent Claims (17, 18, 19)
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Specification