Electric traction drives
First Claim
1. An electric traction drive having a longitudinal axis, the drive comprising:
- a plurality of traction planets distributed radially about the longitudinal axis, each traction planet configured to rotate about a tiltable axis;
a first traction ring in contact with each of the traction planets;
a traction sun rotatable about the longitudinal axis and positioned radially inward of and in contact with each of the traction planets, the traction sun capable of transferring power;
a second traction ring in contact with each of the traction planets; and
an electricity producing generator comprising;
a plurality of non-rotating field windings coupled to a non-rotating component of the drive;
a plurality of rotating permanent magnets coupled to a rotating component of the drive;
a ratio control device operably coupled to the traction sun; and
a carrier operably coupled to each of the traction planets, the carrier operably coupled to the ratio control device.
12 Assignments
0 Petitions
Accused Products
Abstract
Inventive embodiments are directed to components, subassemblies, systems, and/or methods for electric traction drives employing a continuously variable transmission (CVT) having a variator provided with a plurality of tilting traction planets and opposing traction rings. In one embodiment, an electric traction drive is provided with an electromotive device configured to transfer power to or from a traction sun of a CVT, In other embodiments, an electric traction drive is provided with an electromotive device that couples to certain components of a CVT such as a traction ring, a carrier assembly, and a main axle. Various inventive shifting assemblies having shift cams and shift cam cages can be used to facilitate adjusting the transmission speed ratio of a CVT. Various related devices include embodiments of, for example, a power input apparatus, a speed ratio shifter, a shift cam actuator, a shift nut, and a carrier assembly configured to support the tilting traction planets.
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Citations
19 Claims
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1. An electric traction drive having a longitudinal axis, the drive comprising:
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a plurality of traction planets distributed radially about the longitudinal axis, each traction planet configured to rotate about a tiltable axis; a first traction ring in contact with each of the traction planets; a traction sun rotatable about the longitudinal axis and positioned radially inward of and in contact with each of the traction planets, the traction sun capable of transferring power; a second traction ring in contact with each of the traction planets; and an electricity producing generator comprising; a plurality of non-rotating field windings coupled to a non-rotating component of the drive; a plurality of rotating permanent magnets coupled to a rotating component of the drive; a ratio control device operably coupled to the traction sun; and a carrier operably coupled to each of the traction planets, the carrier operably coupled to the ratio control device. - View Dependent Claims (2, 3, 4, 5)
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6. An electric traction drive having a longitudinal axis, the drive comprising:
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a plurality of traction planets distributed radially about the longitudinal axis, each traction planet configured to rotate about a tiltable axis; a first traction ring in contact with the traction planets; a rotatable traction sun coaxial about the longitudinal axis and positioned radially inward of and in contact with each of the traction planets; a second traction ring in contact with the traction planets; a ratio control device operably coupled to the traction sun; a carrier operably coupled to each of the traction planets, the carrier operably coupled to the ratio control device; and an electromotive device operably coupled to the second traction ring, the electromotive device comprising an electric motor winding and an electric rotor, wherein the electric motor winding and the electric rotor are configured to rotate in opposite directions on axes coincident with the longitudinal axis. - View Dependent Claims (7, 8, 9)
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10. An electric traction drive having a longitudinal axis, the drive comprising:
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a plurality of traction planets distributed radially about the longitudinal axis, each traction planet configured to rotate about a tiltable axis; a first traction ring in contact with the traction planets; means for delivering an input power to the first traction ring; a second traction ring in contact with the traction planets; a rotatable traction sun coaxial about the longitudinal axis and positioned radially inward of and in contact with each of the traction planets; a ratio control device operably coupled to the traction sun; a carrier operably coupled to each of the traction planets, the carrier operably coupled to the ratio control device; and an alternator/generator operably coupled to the second traction ring. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An electric traction drive having a longitudinal axis, the drive comprising:
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a plurality of traction planets distributed radially about the longitudinal axis, each traction planet configured to rotate about a tiltable axis; a first traction ring in contact with the traction planets; a drive shaft operably coupled to the first traction ring, the drive shaft adapted to transfer power to and/or from an external power source to the first traction ring; a rotatable traction sun coaxial about the longitudinal axis and positioned radially inward of and in contact with each of the traction planets; a traction sun drive shaft coupled to the traction sun; a ratio control device operably coupled to the traction sun; a carrier operably coupled to each of the traction planets, the carrier operably coupled to the ratio control device; an electric rotor assembly coupled to the traction sun drive shaft; a second traction ring in contact with the traction planets; a main shaft arranged along the longitudinal axis and radially inward of the traction sun drive shaft, the main shaft configured to transfer power to and/or from the second traction ring. - View Dependent Claims (17, 18, 19)
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Specification