Electromechanical variable transmission
First Claim
1. A drive train for a vehicle, comprising:
- a first gear set comprising a sun gear, a ring gear and planetary gears coupling the sun gear to the ring gear;
a second gear set comprising a sun gear, a ring gear and planetary gears coupling the sun gear to the ring gear, wherein the planetary gears of both sets are rotatably supported by respective planetary gear carriers which are coupled to each other;
an engine having an output shaft;
a first clutch which selectively engages the output shaft of the engine with the first gear set;
a first motor/generator coupled to the first gear set;
a second motor/generator coupled to the second gear set and electrically coupled to the first motor/generator;
a second clutch which selectively engages the output shaft of the engine with the second motor/generator; and
a third clutch and a third gear set which operate to selectively engage at least one of the sun gear and the ring gear of the second gear set with the planetary gear carriers of the first and second gear sets.
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Accused Products
Abstract
A vehicle drive includes a first gear set and a second gear set both having a sun gear, a ring gear and planetary gears which couple the sun gear to the ring gear. The planetary gears of both sets are rotatably supported by respective planetary gear carriers which are coupled to each other. The vehicle drive also includes an engine, a first clutch which selectively engages the engine to the ring gear of the first gear set, a first motor/generator coupled to the sun gear of the first gear set and a second motor/generator coupled to the sun gear of the second gear set and electrically coupled to the first motor/generator, a second clutch which selectively engages the engine to the second motor/generator, and a third clutch and a third gear set which operate to selectively engage the ring gear of the second gear set to the planetary gear carriers.
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Citations
17 Claims
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1. A drive train for a vehicle, comprising:
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a first gear set comprising a sun gear, a ring gear and planetary gears coupling the sun gear to the ring gear; a second gear set comprising a sun gear, a ring gear and planetary gears coupling the sun gear to the ring gear, wherein the planetary gears of both sets are rotatably supported by respective planetary gear carriers which are coupled to each other; an engine having an output shaft; a first clutch which selectively engages the output shaft of the engine with the first gear set; a first motor/generator coupled to the first gear set; a second motor/generator coupled to the second gear set and electrically coupled to the first motor/generator; a second clutch which selectively engages the output shaft of the engine with the second motor/generator; and a third clutch and a third gear set which operate to selectively engage at least one of the sun gear and the ring gear of the second gear set with the planetary gear carriers of the first and second gear sets. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A drive train for a vehicle, comprising:
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a first planetary gear set; a second planetary gear set directly coupled to the first planetary gear set; an output shaft selectively coupled to at least one of the first and the second planetary gear sets, wherein the output shaft is radially offset from the first and second planetary gear sets; an engine rotationally engaged with the first planetary gear set; a first electromagnetic device rotationally coupled to the first planetary gear set; and a second electromagnetic device directly coupled to the second planetary gear set and selectively rotationally engaged with the engine. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A vehicle, comprising:
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a dual-mode transmission comprising a first gear set having a first planetary gear carrier and a second gear set having a second planetary gear carrier, wherein the first planetary gear carrier and the second planetary gear carrier are rotatably coupled; an engine coupled to the first gear set; a first motor/generator coupled to the first gear set; a second motor/generator coupled to the second gear set; and a drive axle coupled to the dual-mode transmission; wherein during a first mode of operation of the vehicle the second motor/generator is coupled to the drive axle and decoupled from the engine, and wherein during a second mode of operation of the vehicle the second motor/generator is selectively coupled to the engine and decoupled from the drive axle. - View Dependent Claims (15, 16, 17)
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Specification