Vehicle propulsion system having a continuously variable transmission and method of making same
First Claim
Patent Images
1. A vehicle propulsion system comprising:
- an electric machine (EM) configured to generate an unconditioned output;
a continuously variable transmission (CVT) having an input shaft and an output shaft, the input shaft mechanically coupled to the EM and configured to receive the unconditioned output from the EM and output a conditioned output on the output shaft; and
a fixed-ratio transmission mechanically coupled to the output shaft of the CVT and configured to;
receive the conditioned output from the CVT; and
produce a reconditioned output; and
wherein the fixed-ratio transmission is coupled to the CVT absent a geared connection between the CVT and the fixed-ratio transmission that bypasses the output shaft of the CVT.
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Abstract
A vehicle propulsion system includes an electric machine (EM) configured to generate an unconditioned output. The vehicle propulsion system also includes a continuously variable transmission (CVT) having an input side and an output side, the input side mechanically coupled to the EM and configured to receive the unconditioned output from the EM and produce a conditioned output on the output side. A fixed-ratio transmission is mechanically coupled to the output side of the CVT and configured to receive the conditioned output from the CVT and produce a reconditioned output.
95 Citations
26 Claims
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1. A vehicle propulsion system comprising:
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an electric machine (EM) configured to generate an unconditioned output; a continuously variable transmission (CVT) having an input shaft and an output shaft, the input shaft mechanically coupled to the EM and configured to receive the unconditioned output from the EM and output a conditioned output on the output shaft; and a fixed-ratio transmission mechanically coupled to the output shaft of the CVT and configured to; receive the conditioned output from the CVT; and produce a reconditioned output; and wherein the fixed-ratio transmission is coupled to the CVT absent a geared connection between the CVT and the fixed-ratio transmission that bypasses the output shaft of the CVT. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A vehicle having a vehicle propulsion system, the vehicle comprising:
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a vehicle traction system; an electro-mechanical device configured to produce an unconditioned output; a continuously variable transmission (CVT) having an input shaft and an output shaft, the input shaft directly coupled to an output of the electro-mechanical device and configured to receive the unconditioned output, condition the unconditioned output by transmitting the unconditioned output from a first pair of sheaves of the CVT to a second pair of sheaves of the CVT, and output a conditioned output on the output shaft; and a fixed-ratio transmission directly coupled to the output shaft of the CVT and configured to; receive the conditioned output from the CVT; and deliver a desired vehicle propulsion system output to the vehicle traction system; and wherein a distance between respective sheaves of the first and second pair of sheaves defines a gear ratio of the CVT. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of fabricating a vehicle power system comprising:
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coupling an output of an electric motor (EM) to a continuously variable transmission (CVT) having an input shaft and an output shaft; coupling a fixed transmission to the output shaft of the CVT and absent a geared connection between the fixed transmission and the input shaft of the CVT that bypasses the output shaft of the CVT; and coupling the fixed transmission to a vehicle traction system, the fixed transmission configured to modify an output of the CVT and deliver the modified CVT output to the vehicle traction system. - View Dependent Claims (24, 25, 26)
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Specification