| US 7,549,943 B2 | ||
| Multi-speed transmission | ||
| Gerhard Gumpoltsberger, Friedrichshafen (Germany) | ||
| Assigned to ZF Friedrichshafen AG, Friedrichshafen (Germany) | ||
| Filed on Feb. 09, 2007, as Appl. No. 11/704,879. | ||
| Claims priority of application No. 10 2006 006 642 (DE), filed on Feb. 14, 2006. | ||
| Prior Publication US 2008/0103014 A1, May 01, 2008 | ||
| Int. Cl. F16H 3/44 (2006.01); F16H 3/62 (2006.01); F16H 37/06 (2006.01) | ||
| U.S. Cl. 475—284 [475/330] | 23 Claims |
| 1. A multi-speed automatic transmission of a planetary design for a motor vehicle, the transmission comprising:
an input shaft (1) and an output shaft (2) arranged in a housing (G);
first, second and third planetary gearsets (P1, P2, P3), and each of the first, the second and the third planetary gearsets (P1, P2, P3) comprising a sun gear, a carrier and a ring gear;
at least third, fourth, fifth and sixth rotatable shafts (3, 4, 5, 6) as well as at least six shifting elements (03, 04, 13, 14, 34, 35, 36, 56), comprising first and second brakes (03, 04) and first, second, third and fourth clutches (13, 14, 34, 35, 36, 56), whose selective engagement creates different gear ratios between the input shaft (1) and the output shaft (2) so that at least seven forward gears and one reverse gear can be implemented;
wherein the input shaft (1) is permanently connected to the sun gear of the second planetary gearset (P2), and the input shaft (1) is detachably connected, via the first clutch (13), to the third shaft (3) and, via the second clutch (14), to the fourth shaft (4);
the output shaft (2) is permanently connected to the carrier of the second planetary gearset (P2) and to the ring gear of the third planetary gearset (P3);
the third shaft (3) is permanently connected to the carrier of the first planetary gearset (P1), and the third shaft (3) is detachably connected, via the first brake (03), to the housing (G) and, via the third clutch (36), to the sixth shaft (6);
the fourth shaft (4) is permanently connected to the sun gear of the first planetary gearset (P1), and the fourth shaft (4) is detachably connected, via the second brake (04), to the housing (G);
the fifth shaft (5) is permanently connected to the ring gear of the first planetary gearset (P1) and to the carrier of the third planetary gearset (P3);
the sixth shaft (6) is permanently connected to the ring gear of the second planetary gearset (P2);
the sun gear of the third planetary gearset (P3) is connected to the housing (G); and
one of:
the fifth shaft (5) is detachably connected, via the fourth clutch (56), to the sixth shaft (6),
the fifth shaft (5) is detachably connected, via the fourth clutch (35), to the third shaft (3), and
the third shaft (3) is detachably connected, via the fourth clutch (34), to the fourth shaft (4).
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