Electric traction drives
First Claim
1. An electric traction drive comprising:
- a main axle defining a longitudinal axis;
a plurality of traction planets distributed radially about the main axle, each traction planet configured to rotate about a planet axle, each planet axle providing a tiltable axis of rotation, wherein an adjustment of a tilt angle of the planet axle adjusts a speed ratio of a continuously variable variator;
a first traction ring positioned on a first side of the plurality of traction planets;
a second traction ring positioned on a second side of the plurality of traction planets;
a traction sun rotatable about the main axle and positioned radially inward of the plurality of traction planets, the traction sun capable of transferring power to or from the plurality of traction planets;
a housing rotatable about the longitudinal axis;
a carrier coupled to the main axle;
a set of electrical cables routed through a portion of the continuously variable variator;
a set of non-rotatable field windings coupled to the set of electrical cables; and
a set of magnets located radially outward of the set of field windings, the set of magnets being rotatable relative to the main axle, wherein the first traction ring, the plurality of traction planets, and the second traction ring form a first power path to the housing, and wherein the electrical cables, the set of non-rotatable field windings, the set of magnets, and the carrier form a second power path.
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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 comprising:
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a main axle defining a longitudinal axis; a plurality of traction planets distributed radially about the main axle, each traction planet configured to rotate about a planet axle, each planet axle providing a tiltable axis of rotation, wherein an adjustment of a tilt angle of the planet axle adjusts a speed ratio of a continuously variable variator; a first traction ring positioned on a first side of the plurality of traction planets; a second traction ring positioned on a second side of the plurality of traction planets; a traction sun rotatable about the main axle and positioned radially inward of the plurality of traction planets, the traction sun capable of transferring power to or from the plurality of traction planets; a housing rotatable about the longitudinal axis; a carrier coupled to the main axle; a set of electrical cables routed through a portion of the continuously variable variator; a set of non-rotatable field windings coupled to the set of electrical cables; and a set of magnets located radially outward of the set of field windings, the set of magnets being rotatable relative to the main axle, wherein the first traction ring, the plurality of traction planets, and the second traction ring form a first power path to the housing, and wherein the electrical cables, the set of non-rotatable field windings, the set of magnets, and the carrier form a second power path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A vehicle comprising:
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a mechanical power source; an electric power source; an electric traction drive for transferring power from the mechanical power source and the electric power source into a single output power source, the electric traction device comprising; a main axle defining a longitudinal axis; a plurality of traction planets distributed radially about the main axle, each traction planet configured to rotate about a planet axle, each planet axle providing a tiltable axis of rotation, wherein an adjustment of a tilt angle of the planet axle adjusts a speed ratio of a continuously variable variator; a first traction ring positioned on a first side of the plurality of traction planets; a second traction ring positioned on a second side of the plurality of traction planets; a traction sun rotatable about the main axle and positioned radially inward of the plurality of traction planets, the traction sun capable of transferring power to or from the plurality of traction planets; a housing rotatable about the longitudinal axis; a carrier coupled to the main axle; a set of electrical cables routed through a portion of the continuously variable variator; a set of non-rotatable field windings coupled to the set of electrical cables; and a set of magnets located radially outward of the set of field windings, the set of magnets being rotatable relative to the main axle, wherein the first traction ring, the plurality of traction planets, and the second traction ring form a first power path to the housing, and wherein the electrical cables, the set of non-rotatable field windings, the set of magnets, and the carrier form a second power path. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification