Infinite variable transmission with planetary gear set
First Claim
1. A continuously variable planetary transmission comprising:
- an input shaft;
a first planetary gear set comprising a first carrier drivingly engaged to the input shaft, a first sun gear drivingly engaged to a first set of planet gears which are engaged to a first ring gear, wherein the first ring gear is fixed to a first casing of the first planetary gear set, and wherein a first ring assembly of a variator is drivingly engaged to the first sun of the first planetary gear set;
the variator comprising a plurality of variator balls mounted on axes, themselves held in a cage or variator carrier allowing changing of an input or output ratio by tilting the variator balls'"'"' axes, the first ring assembly and a second ring assembly that is drivingly engaged to a second sun gear of a second planetary gear set; and
the second planetary gear set comprising the second sun that is drivingly engaged to a second set of planet gears, and a second carrier coupled to the input shaft, wherein the second set of planet gears is drivingly engaged to a second ring gear of the second planetary gear set, and wherein said second ring gear is mechanically coupled to a differential.
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Accused Products
Abstract
A variable transmission includes various powerpath layouts consisting in either; a single mode with approximately symmetrical reverse and forward speeds and includes an input shaft, one or two planetary gear sets, or a planetary gear set and a compound gear set when the RTS (ring-to-sun) ratio of the planetary gear set is not physically possible; or a dual mode with each mode being selected by closing a clutch/brake and releasing the other. A first up-speed planetary gear set on the input side of a variator, and a second planetary gear set on the output side of the variator, both configured to split the torque when drivingly engaged with a variator comprising, a first ring assembly, and a second ring assembly. Various up-speed ratio arrangements are shown that tend to increase the speeds and decrease the torque acting on the CVP, allowing a decrease in the variator size.
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Citations
16 Claims
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1. A continuously variable planetary transmission comprising:
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an input shaft; a first planetary gear set comprising a first carrier drivingly engaged to the input shaft, a first sun gear drivingly engaged to a first set of planet gears which are engaged to a first ring gear, wherein the first ring gear is fixed to a first casing of the first planetary gear set, and wherein a first ring assembly of a variator is drivingly engaged to the first sun of the first planetary gear set; the variator comprising a plurality of variator balls mounted on axes, themselves held in a cage or variator carrier allowing changing of an input or output ratio by tilting the variator balls'"'"' axes, the first ring assembly and a second ring assembly that is drivingly engaged to a second sun gear of a second planetary gear set; and the second planetary gear set comprising the second sun that is drivingly engaged to a second set of planet gears, and a second carrier coupled to the input shaft, wherein the second set of planet gears is drivingly engaged to a second ring gear of the second planetary gear set, and wherein said second ring gear is mechanically coupled to a differential. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification