Multiple speed automatic transmission
First Claim
1. A multiple-speed automatic transmission comprising:
- an input;
an output;
a Ravigneaux gearset including a first sun gear secured to a first rotating member;
a second sun gear secured to a second rotating member, a fourth rotating member and a fifth rotating member;
a first ring gear secured to the output;
a first carrier secured to a third and a sixth rotating members;
first planet pinions rotatably supported on the first carrier and meshing with the first sun gear;
second planet pinions rotatably supported on the first carrier and meshing with the second sun gear, first planet pinions and a first ring gear;
a first clutch being operable to connect the first gear unit output and the first rotating member;
a second clutch being operable to connect the first gear unit output and the second rotating member;
a third clutch being operable to connect the third rotating member and the input;
fourth clutch being operable to connect the fourth rotating member and the input;
a first brake being operable to hold the fifth rotating member against rotation;
a second brake being operable to hold the sixth rotating member against rotation;
a first gear unit producing a gear ratio greater than unity and including a third sun gear secured to the input, the third clutch and the fourth clutch;
a second ring gear secured to the first and second clutches;
a second carrier grounded against rotation and secured to the first brake;
third planet pinions supported on the second carrier and meshing with the third sun gear; and
fourth planet pinions supported on the second carrier and meshing with the third planet pinions, and the second ring gear.
1 Assignment
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Accused Products
Abstract
A multiple-speed automatic transmission includes an input, output, a first gear unit drivable connected to the input and including a component rotating at the speed of the input and a first gear unit output, the first gear unit producing a gear ratio of a speed of the input and a speed of a first gear unit output, the gear ratio being greater than unity, and a Ravigneaux gear unit for producing multiple ratios of the speed of the input and a speed of the output, the Ravigneaux gear unit being driveably connected to first, second, third, fourth, fifth and sixth rotating members and the output. A first clutch connects the first gear unit output and the first rotating member; a second clutch connects the first gear unit output and the second rotating member; a third clutch connects the third rotating member and one of the input and the rotating component, a fourth clutch connects the fourth rotating member and one of the input and the component; a first brake holds the fifth rotating member against rotation; and a second brake holds the sixth rotating member against rotation.
15 Citations
14 Claims
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1. A multiple-speed automatic transmission comprising:
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an input; an output; a Ravigneaux gearset including a first sun gear secured to a first rotating member;
a second sun gear secured to a second rotating member, a fourth rotating member and a fifth rotating member;
a first ring gear secured to the output;
a first carrier secured to a third and a sixth rotating members;
first planet pinions rotatably supported on the first carrier and meshing with the first sun gear;
second planet pinions rotatably supported on the first carrier and meshing with the second sun gear, first planet pinions and a first ring gear;a first clutch being operable to connect the first gear unit output and the first rotating member; a second clutch being operable to connect the first gear unit output and the second rotating member; a third clutch being operable to connect the third rotating member and the input; fourth clutch being operable to connect the fourth rotating member and the input; a first brake being operable to hold the fifth rotating member against rotation; a second brake being operable to hold the sixth rotating member against rotation; a first gear unit producing a gear ratio greater than unity and including a third sun gear secured to the input, the third clutch and the fourth clutch;
a second ring gear secured to the first and second clutches;
a second carrier grounded against rotation and secured to the first brake;
third planet pinions supported on the second carrier and meshing with the third sun gear; and
fourth planet pinions supported on the second carrier and meshing with the third planet pinions, and the second ring gear. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A multiple-speed automatic transmission comprising:
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an input; an output; a Ravigneaux gearset including a first sun gear;
a second sun gear;
a first ring gear secured to the output;
a first carrier;
first planet pinions rotatably supported on the first carrier and meshing with the first sun gear;
second planet pinions rotatably supported on the first carrier and meshing with the second sun gear, the first planet pinions and the first ring gear;a first gear unit including a third sun gear;
a second ring gear;
a second carrier grounded against rotation;
third planet pinions supported on the second carrier and meshing with the third sun gear; and
fourth planet pinions supported on the second carrier and meshing with the third planet pinions and the second ring gear;a first clutch being operable to connect the second ring gear and the first sun gear; a second clutch being operable to connect the second ring gear and the second sun gear; a third clutch being operable to connect the first carrier and the input; a fourth clutch being operable to connect the second sun gear and the input; a first brake being operable to hold the second sun gear against rotation; and a second brake being operable to hold the first carrier against rotation; a low-reverse gear producing a second reverse gear ratio less than a first reverse gear ratio when the fourth clutch and second brake are engaged. - View Dependent Claims (14)
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Specification