Continuously variable transmission
First Claim
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1. A tractor comprising:
- a tractor chassis;
a plurality of wheels operationally coupled to the tractor chassis;
a power train operationally coupled to the wheels, the power train comprising;
a planetary gearset mounted on a shaft, the shaft defining a longitudinal axis;
a variator comprising;
a plurality of balls, each ball having a tiltable axis about which it rotates;
a first disc in contact with the balls;
a second disc in contact with the balls; and
an idler in contact with the balls;
wherein the variator is mounted coaxially with the planetary gearset along the longitudinal axis; and
wherein the planetary gearset is operationally coupled to the variator.
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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 tractor comprising:
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a tractor chassis; a plurality of wheels operationally coupled to the tractor chassis; a power train operationally coupled to the wheels, the power train comprising; a planetary gearset mounted on a shaft, the shaft defining a longitudinal axis; a variator comprising; a plurality of balls, each ball having a tiltable axis about which it rotates; a first disc in contact with the balls; a second disc in contact with the balls; and an idler in contact with the balls; wherein the variator is mounted coaxially with the planetary gearset along the longitudinal axis; and wherein the planetary gearset is operationally coupled to the variator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification