Multiple speed transmission
AssigneeFord Global Technologies, LLC
InventorsGregory Daniel Goleski, Steven Gerald Thomas
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.
Claims27
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 a fifth element to rotate at a speed between zero and a speed of a sixth element, wherein the fifth element is coupled to the fourth element and the sixth element is coupled to the second element;
- and
- a first shiftable gearing arrangement configured to selectively constrain the fourth element to rotate at a speed between speeds of the first element and the third 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 fourth element to rotate at a speed between speeds of a fifth element and a sixth element, wherein the fifth element is coupled to the first element and the sixth element is coupled to the third element;
- and
- 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.
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 a seventh element to rotate at a speed between speeds of a fifth element and a sixth element, wherein the fifth element is coupled to the first element, the seventh element is coupled to the fourth element, and the sixth element is coupled to the third 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;
- a first brake selectively holding the second element against rotation;
- a first clutch selectively coupling the third element to the input shaft;
- a third clutch selectively coupling the first element to the third element;
- and
- a fourth clutch selectively coupling the first element to the fourth element.
Dependencies are inferred from the claim text.