3-mode front wheel drive and rear wheel drive continuously variable planetary transmission
First Claim
1. A continuously variable transmission comprising:
- a stationary housing;
an input shaft;
an output shaft;
a gearset having a first rotating element, a second rotating element, a third rotating element, and a fourth rotating element;
a variator assembly having a first ring assembly and a second ring assembly;
a first clutch capable of engaging the fourth rotating element to the stationary housing;
a second clutch capable of engaging the input shaft to the second rotating element; and
a third clutch capable of engaging the second rotating element to the stationary housing;
whereinthe input shaft is fixedly connected with the first ring assembly, the second ring assembly is fixedly connected with the first rotating element,the output shaft is fixedly connected with the third rotating element, engagement of the first clutch establishes a first forward variable range within an overall transmission speed ratio,engagement of the second clutch establishes a second forward variable range within the overall transmission speed ratio,engagement of the third clutch establishes a reverse variable range within the overall transmission speed ratio, andthe variator controls a variable speed ratio between speeds of the first ring assembly and the second ring assembly, thereby adjusting the overall transmission speed ratio within any of the first forward variable range, the second forward variable range or the reverse variable range.
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Accused Products
Abstract
A front wheel drive or rear wheel drive continuously variable transmission is provided having an input shaft, an output shaft, a continuously variable tilting ball planetary variator, a compound planetary gearset assembly having first, second, third, and fourth rotating elements, and a plurality of torque transmitting devices. The compound planetary gearset assembly has a simple single pinion gearset and a compound double pinion gearset, having fixedly connected planetary carriers and fixedly connected ring gears, creating a joint planetary gear carrier and joint ring gear. The outer planetary gears engage the ring gear which drives the output shaft. Selective torque transmitting devices include clutches and braking clutches.
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Citations
14 Claims
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1. A continuously variable transmission comprising:
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a stationary housing; an input shaft; an output shaft; a gearset having a first rotating element, a second rotating element, a third rotating element, and a fourth rotating element; a variator assembly having a first ring assembly and a second ring assembly; a first clutch capable of engaging the fourth rotating element to the stationary housing; a second clutch capable of engaging the input shaft to the second rotating element; and a third clutch capable of engaging the second rotating element to the stationary housing; wherein the input shaft is fixedly connected with the first ring assembly, the second ring assembly is fixedly connected with the first rotating element, the output shaft is fixedly connected with the third rotating element, engagement of the first clutch establishes a first forward variable range within an overall transmission speed ratio, engagement of the second clutch establishes a second forward variable range within the overall transmission speed ratio, engagement of the third clutch establishes a reverse variable range within the overall transmission speed ratio, and the variator controls a variable speed ratio between speeds of the first ring assembly and the second ring assembly, thereby adjusting the overall transmission speed ratio within any of the first forward variable range, the second forward variable range or the reverse variable range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification