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US 8,574,114 B2Granted
10-gear automatic transmission
AssigneeZF Friedrichshafen AG
InventorsMartin Brehmer, Gabor Diosi, Josef Haupt
Life of this patent
Estimating the term…
Abstract
The invention concerns an automatic transmission of planetary structure, comprising a drive input shaft (AN), a drive output shaft (AB), first, second, third and fourth planetary gear sets (RS1, RS2, RS3, RS4) and six shifting element (A, B, C, D, E, F). By the selective engagement of three of a total of six shifting elements (A to F), ten forward gears and up to two reverse gears can be engaged without range shifts.
Claims14
Automatic transmission of planetary structure, for a motor vehicle, comprising:
- a drive input shaft;
- a drive output shaft;
- first, second, third and fourth planetary gear sets, and each of the first, the second, the third and the fourth planetary gear sets comprising three elements;
- six shifting elements for achieving ten forward speed ratios and at least one reverse speed ratio,
- wherein the output shaft is permanently connected with one of the elements of the third planetary gear set;
- the input shaft is permanently connected with one of the elements of the fourth planetary gear set;
- a first one of the elements of the first planetary gear set is connectable to the transmission housing by engaging a first one of the six shifting elements;
- a second one of the elements of the first planetary gear set is connectable to the transmission housing by engaging a second one of the six shifting elements;
- one of the elements of the fourth planetary gear set is connectable to the transmission housing;
- a first interconnecting shaft permanently connects one of the elements of the first planetary gear set with one of the elements of the fourth planetary gear set;
- a second interconnecting shaft permanently connects one of the elements of the first planetary gear set with one of the elements of the third planetary gear set;
- and
- a third interconnecting shaft permanently connects one of the elements of the second planetary gear set with one of the elements of the fourth planetary gear set.
10 more elements
Dependencies are inferred from the claim text.