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 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.
1 Assignment
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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.
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Citations
3 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 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 (2, 3)
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Specification