Multiple speed transmission
AssigneeFord Global Technologies, LLC
InventorGregory Daniel Goleski
Life of this patent
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Abstract
A family of transmissions produces at least eight forward and one reverse speed ratio by selective engagement of various combinations of three clutches or brakes. Each transmission includes two fixed gearing arrangements that establish fixed speed relationships between an input shaft, and output shaft, and four other elements. Specifically, the input shaft is constrained to rotate at a speed between that of the first and second elements while the output shaft is constrained to rotate at a speed between that of the third and fourth elements. Additional gearing, clutches, and brakes establish specified selective speed relationships among these elements.
Claims22
A transmission comprising:
- an input shaft;
- an output shaft;
- a transmission case;
- and
- first, second, third, and fourth simple planetary gear sets, each simple planetary gear set having a sun gear, a planet carrier, a ring gear, and a plurality of planet gears supported for rotation relative to the planet carrier and in continuous meshing engagement with both the sun gear and the ring gear wherein
- the input shaft is fixedly coupled to the second planet carrier and selectively coupled to the fourth sun gear;
- the output shaft is fixedly coupled to the fourth planet carrier and coupled to the third planet carrier;
- the second sun gear is selectively coupled to the transmission case and coupled to the first sun gear;
- the first ring gear is coupled to the transmission case;
- the fourth ring gear is coupled to the first planet carrier and selectively directly coupled to the second ring gear;
- the second ring gear is coupled to the third sun gear and selectively coupled to the fourth sun gear;
- and
- the third ring gear is coupled to the fourth sun gear.
A transmission comprising:
- an input shaft;
- an output shaft;
- a first fixed gearing arrangement configured to fixedly constrain the input shaft to rotate at a speed between speeds of a first element and a second element;
- a second fixed gearing arrangement configured to fixedly constrain the output shaft to rotate at a speed between speeds of a third element and a fourth element and fixedly constrain the fourth element to rotate at a speed between speeds of the third element and a fifth element;
- a first shiftable gearing arrangement configured to selectively constrain the fourth element to rotate at a speed between zero and a speed of the second element;
- and
- a first clutch selectively coupling the first element to the fourth element.
A transmission comprising:
- an input shaft;
- an output shaft;
- a first fixed gearing arrangement configured to fixedly constrain the input shaft to rotate at a speed between speeds of a first element and a second element;
- a second fixed gearing arrangement configured to fixedly constrain the output shaft to rotate at a speed between speeds of a third element and a fourth element;
- a third fixed gearing arrangement configured to fixedly constrain the output shaft to rotate at a speed between speeds of a seventh element and an eighth element, wherein the seventh element is coupled to the third element and the eighth element is coupled to the first element;
- a first shiftable gearing arrangement configured to selectively constrain the fourth element to rotate at a speed between zero and a speed of the second element;
- and
- a first clutch selectively directly coupling the first element to the fourth element.
Dependencies are inferred from the claim text.