Electromechanical variable transmission
First Claim
1. A vehicle drive comprising:
- a first gear set including a sun gear, a ring gear and planetary gears which couple the sun gear to the ring gear;
a second gear set including a sun gear, a ring gear and planetary gears which couple 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;
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;
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 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.
348 Citations
12 Claims
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1. A vehicle drive comprising:
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a first gear set including a sun gear, a ring gear and planetary gears which couple the sun gear to the ring gear; a second gear set including a sun gear, a ring gear and planetary gears which couple 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; 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; 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 of the first and second gear sets. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A vehicle transmission, comprising:
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a first planetary gear set having planetary gears; a second planetary gear set having planetary gears directly coupled to the planetary gears of the first planetary gear set; a third planetary gear set coupled to both the first and second planetary gear sets, wherein the third planetary gear set is radially offset from the first and second planetary gear sets; an engine selectively rotationally engaged to the first planetary gear set; a first electromagnetic device rotationally coupled to the first planetary gear set; and a second electromagnetic device rotationally coupled to the second planetary gear set and selectively rotationally engaged with the engine. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification