Multiple-speed automatic transmission having a two-speed input and a Simpson gearset
First Claim
1. A multi-speed automatic transmission comprising:
- an input;
an output;
a first clutch, a second clutch, and a third clutch;
a first power path producing a first speed ratio and including the first clutch and the second clutch;
a second power path producing a second speed ratio, higher than said first fixed speed ratio, and including the third clutch;
a first brake associated with the first power path;
a second brake associated with the second power path;
a planetary gear system comprising a first and second gear units, each gear unit including a sun gear, a ring gear, planet pinions meshing with the sun gear and the ring gear, and a carrier rotatably supporting the planet pinions, the sun gear of the first gear unit being secured to the sun gear of the second gear unit, a first ring gear of the first gear unit being secured to the output, a second ring gear of the first gear unit being secured to the carrier of the second gear unit;
the first clutch being operable to connect the ring gear of the second gear unit to the input through said first power path, the second clutch being operable to couple the sun gears to the input through said first power path, the third clutch being operable to couple the carrier of the first gear unit to the input through the second power path, the first brake being operable to hold the carrier of the first gear unit against rotation, and the second brake being operable to hold the sun gears against rotation.
2 Assignments
0 Petitions
Accused Products
Abstract
A multi-speed automatic transmission includes an input and output, first, second and three planetary gear units, each gear unit including a sun gear, a ring gear, planet pinions meshing with the sun gear and the ring gear, and a carrier rotatably supporting the planet pinions. A first brake alternately holds against rotation and releases the sun gear of the second gear unit and the sun gear of the third gear unit. A second brake alternately holds and releases the carrier of the second gear unit. A first clutch alternately connects and disconnects the carrier of the first gear unit and the ring gear of the third gear unit. A second clutch alternately disconnects and connects the carrier of the first gear unit to the sun gears of the second gear unit and third gear unit. A third clutch alternately releases and connects the input and ring gear of the first gear unit to the carrier of the second gear unit.
14 Citations
14 Claims
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1. A multi-speed automatic transmission comprising:
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an input; an output; a first clutch, a second clutch, and a third clutch; a first power path producing a first speed ratio and including the first clutch and the second clutch; a second power path producing a second speed ratio, higher than said first fixed speed ratio, and including the third clutch; a first brake associated with the first power path; a second brake associated with the second power path; a planetary gear system comprising a first and second gear units, each gear unit including a sun gear, a ring gear, planet pinions meshing with the sun gear and the ring gear, and a carrier rotatably supporting the planet pinions, the sun gear of the first gear unit being secured to the sun gear of the second gear unit, a first ring gear of the first gear unit being secured to the output, a second ring gear of the first gear unit being secured to the carrier of the second gear unit; the first clutch being operable to connect the ring gear of the second gear unit to the input through said first power path, the second clutch being operable to couple the sun gears to the input through said first power path, the third clutch being operable to couple the carrier of the first gear unit to the input through the second power path, the first brake being operable to hold the carrier of the first gear unit against rotation, and the second brake being operable to hold the sun gears against rotation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14)
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9. A multiple-speed transmission comprising:
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an input; an output; a gear system comprising a first, second and third planetary gear units, each gear unit including a sun gear, a ring gear, planet pinions meshing with the sun gear and the ring gear, and a carrier rotatably supporting the planet pinions, the carrier of the third gear unit being secured to a sun gear the second gear unit for rotation therewith, the output being secured to a sun gear of the second gear unit for rotation therewith; a first brake for alternately holding against rotation and releasing the carrier of the second gear unit; a second brake for alternately holding against rotation and releasing the sun gear of the second gear unit and the sun gear of the third gear unit; a first clutch for alternately driveably connecting and disconnecting the carrier of the first gear unit and the ring gear of the third gear unit; a second clutch for alternately driveably disconnecting and connecting the carrier of the first gear unit to the sun gears of the second gear unit and third gear unit; and a third clutch for alternately releasing and driveably connecting the input and ring gear of the first gear unit to the carrier of the second gear unit.
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Specification