Electromotive drives
View Patent ↗A transmission having a plurality of tilting balls and opposing input and output discs provides an infinite number of speed combinations over its transmission ratio range. The transmission provides multiple powerpaths and can be combined with electrical components to provide motor/generator functionality, which reduces the overall size and complexity of the motor and transmission compared to when they are constructed separately. In one embodiment, rotatable components of a continuously variable transmission are coupled separately to an electrical rotor and to an electrical stator so that the rotor and stator rotate simultaneously in opposite directions relative to one another. In other embodiments, an electrical rotor is configured to transfer torque to or from a disc that is in contact with a plurality of speed adjusters, while an electrical stator is configured to transfer torque to a shaft that is operationally coupled to the speed adjusters via an idler.
1. A variable speed transmission having a longitudinal axis, the transmission comprising:
a plurality of balls distributed radially about the longitudinal axis, each ball having a tiltable axis about which it rotates;
an input disc in contact with each of the balls;
an idler rotatable about the longitudinal axis and positioned radially inward of and in contact with each of the balls, the idler capable of transferring power;
an output disc in contact with each of the balls; and
an electricity-producing generator comprising:
a non-rotating electrical stator coupled to a nonrotating component of the transmission; and
a rotating electrical rotor coupled to a rotating component of the transmission.
2. The transmission of claim 1 , further comprising a non-rotating cage, the cage configured to position the balls radially and axially relative to the longitudinal axis.
3. The transmission of claim 2 , wherein the non-rotating electrical stator is rigidly attached to the non-rotating cage.
4. The transmission of claim 3 , further comprising a hub shell rotatable about the longitudinal axis.
5. The transmission of claim 4 , wherein the electrical rotor is rigidly attached to the rotatable hub shell.
6. The transmission of claim 5 , further comprising a non-rotating shaft extending along at least a portion of the longitudinal axis, wherein at least one wire is routed outside of the transmission from the electrical stator through the non-rotating shaft.
7. A variable speed transmission having a longitudinal axis, the transmission comprising:
a plurality of balls distributed radially about the longitudinal axis, each ball having a tiltable axis about which it rotates;
an input disc in contact with each of the balls;
an output disc in contact with each of the balls;
an idler rotatable about the longitudinal axis and positioned radially inward of and in contact with each of the balls;
an electrical stator coupled to a component of the transmission; and
a rotating electrical rotor coupled to a component of the transmission.
8. The transmission of claim 7 , wherein the electrical stator is operably attached to the idler and receives power from the idler.
9. The transmission of claim 8 , wherein the electrical rotor is operably attached to the output disc and receives power from the output disc.
10. The transmission of claim 9 , wherein the electrical stator and the electrical rotor rotate in opposite directions relative to one another.
11. The transmission of claim 10 , wherein a speed differential between the electrical stator and the electrical rotor creates a speed increase relative to the transmission input speed in all ratios.
12. A variable speed transmission having a longitudinal axis, the transmission comprising:
a plurality of balls distributed radially about the longitudinal axis, each ball having a tiltable axis about which it rotates;
an input disc in contact with each of the balls;
an output disc in contact with each of the balls;
a cage configured to position the balls radially and axially relative to the longitudinal axis;
an idler rotatable about the longitudinal axis and positioned radially inward of and in contact with each of the balls; and
an electrical stator coaxial with the longitudinal axis and configured to receive electricity.
13. The transmission of claim 12 , wherein the electrical stator is operably attached to the cage.
14. The transmission of claim 13 , further comprising an electrical rotor rotatable about the longitudinal axis.
15. The transmission of claim 14 , wherein the electrical rotor is operably attached to the input disc and configured to transfer power to the input disc.
16. The transmission of claim 15 , further comprising a non-rotating shaft extending along at least a portion of the longitudinal axis, wherein at least one wire is routed outside of the transmission from the electrical stator through the non-rotating shaft.
17. The transmission of claim 16 , wherein a speed differential between the electrical stator and the electrical rotor creates a speed reduction through the transmission so that the output disc rotates more slowly in all ratios than a speed differential between the electrical stator and the electrical rotor.
18. The transmission of claim 14 , wherein the cage is rotatable about the longitudinal axis.
19. The transmission of claim 18 , wherein the electrical rotor is operably attached to the cage.
20. The transmission of claim 19 , wherein the electrical stator and the electrical rotor are rotatable in the same direction.