Multiple speed automatic transmission
First Claim
1. A multi-speed automatic transmission comprising:
- an input;
an 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 the first gear unit output, the gear ratio being greater than unity;
a planetary gear unit including a modified Simpson gearset, the gear unit being secured to first, second, third, fourth and fifth rotating members, the fifth rotating member being secured to the output for rotation therewith,a first clutch being operable to connect the first rotating member and the first gear unit output;
a second clutch being operable to connect the second rotating member and the first gear unit output;
a third clutch being operable to connect the third rotating member and an element rotating at a speed of the input;
a fourth clutch being operable to connect the fourth rotating member and said element rotating at the speed of the input;
a first brake being operable to hold the fourth rotating member against rotation; and
a second brake being operable to hold the third rotating member against rotation.
1 Assignment
0 Petitions
Accused Products
Abstract
A multi-speed automatic transmission includes an input, an 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 the first gear unit output, a planetary gear unit including a modified Simpson gearset, the gear unit being secured to first, second, third, fourth and fifth rotating members, the fifth member being secured to the output for rotation therewith, a first clutch being operable to connect the first rotating member and the first gear unit output, a second clutch being operable to connect the second rotating member and the first gear unit output, a third clutch being operable to connect the third rotating member and an element rotating at a speed of the input, a fourth clutch being operable to connect the fourth rotating member and said element rotating at the speed of the input, a first brake being operable to hold the fourth rotating member against rotation, and a second brake being operable to hold the third rotating member against rotation.
14 Citations
19 Claims
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1. A multi-speed automatic transmission comprising:
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an input; an 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 the first gear unit output, the gear ratio being greater than unity; a planetary gear unit including a modified Simpson gearset, the gear unit being secured to first, second, third, fourth and fifth rotating members, the fifth rotating member being secured to the output for rotation therewith, a first clutch being operable to connect the first rotating member and the first gear unit output; a second clutch being operable to connect the second rotating member and the first gear unit output; a third clutch being operable to connect the third rotating member and an element rotating at a speed of the input; a fourth clutch being operable to connect the fourth rotating member and said element rotating at the speed of the input; a first brake being operable to hold the fourth rotating member against rotation; and a second brake being operable to hold the third rotating member against rotation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A multi-speed automatic transmission comprising:
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an input; an 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 the first gear unit output, the gear ratio being greater than unity; a second gear unit including first and second sun gears, a first ring gear, a first carrier, and first planet pinions supported on the first carrier and engaged with the first sun gear, second sun gear and first ring gear; a third gear unit including a third sun gear, a second ring gear, a second carrier, and second planet pinions supported on the second carrier and engaged with the third sun gear and second ring gear; the second carrier and first ring gear being driveably connected to the output, the second sun gear and third sun gear being mutually driveably connected; a first clutch being operable alternately to connect and disconnect the first gear unit output and the second ring gear; a second clutch being operable alternately to connect and disconnect the first gear unit output to the second and third sun gears; a third clutch being operable alternately to connect and disconnect the input and the first carrier; a fourth clutch being operable alternately to connect and disconnect the input and the first sun gear; a first brake being operable alternately to release and to hold the first sun gear against rotation; and a second brake being operable alternately to release and to hold the first carrier against rotation. - View Dependent Claims (15, 16)
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17. A multi-speed automatic transmission comprising:
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an input; an 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 the first gear unit output, the gear ratio being greater than unity; a second gear unit including first and second sun gears, a first ring gear, a first carrier, and first planet pinions supported on the first carrier and engaged with the first sun gear, second sun gear and first ring gear; a third gear unit including a third sun gear secured to the second sun gear, a second ring gear secured to the output, a third ring gear secured to the first carrier, a second carrier, and second planet pinions supported on the second carrier and engaged with the third sun gear, the second ring gear and the third ring gear; a first clutch being operable alternately to connect and disconnect the first gear unit output and the first ring gear; a second clutch being operable alternately to connect and disconnect the first gear unit output to the second sun gear and third sun gear; a third clutch being operable alternately to connect and disconnect the input and the second carrier; a fourth clutch being operable alternately to connect and disconnect the input and the first sun gear; a first brake being operable alternately to release and to hold the second sun gear and third sun gear against rotation; and a second brake being operable alternately to release and to hold the second carrier against rotation. - View Dependent Claims (18, 19)
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Specification