Multiple gear stage automatic transmission
AssigneeZF Friedrichshafen AG
InventorsPeter Tiesler, Gerhard Gumpoltsberger
Life of this patent
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Abstract
A multiple stage transmission of a planetary design having first, second and third planetary gear sets (P1, P2, P3), at least first, second, third, fourth, fifth and sixth rotatable shafts (1, 2, 3, 4, 5, 6), first and second brakes (03, 04) and first, second third and fourth clutches (14, 15, 36, 56). Selective engagement of the planetary gear sets (P1, P2, P3), the rotatable shafts (1, 2, 3, 4, 5, 6), the brakes (03, 04) and the clutches (14, 15, 36, 56) produces different reduction ratios between the drive shaft and the driven shaft such that seven or eight forward gears and at least one reverse gear is achieved.
Claims29
A multiple stage transmission of a planetary design for an automatic transmission of a motor vehicle, the multiple stage transmission comprising:
- a housing (G) accommodating:
- a drive shaft (1) and a driven shaft (2);
- a first planetary gear set (P1);
- a second planetary gear set (P2);
- a third planetary gear set (P3);
- at least third, fourth, fifth, and sixth rotatable shafts (3, 4, 5, 6) and a fixed shaft (0);
- at least first, second, third, fourth, fifth and sixth shifting elements (03, 04, 14, 15, 36, 56) including first and second brakes (03, 04) and first, second, third and fourth clutches (14, 15, 36, 56) which are selectively engageable to produce different gear ratios between the drive shaft (1) and the driven shaft (2) such that the transmission implements at least first, second, third, fourth, fifth, sixth and seventh forward gears and at least one reverse gear;
- the drive shaft (1) being permanently connected with a ring gear of the first planetary gear set (P1) and, via a second clutch (15), with the fifth shaft (5) supporting a sun gear of the second planetary gear set (P2) and a sun gear of the third planetary gear set (P3), and the fifth shaft (5) being connectable, via the fourth clutch (56), with the sixth shaft (6);
- the sixth shaft (6), adjacent a first end, being connected with a spider of the first planetary gear set (P1) and, adjacent a second end, being connectable, via the third clutch (36), with the third shaft (3) which is permanently connected with a ring gear of the second planetary gear set (P2) and being connectable, via the first brake (03), to the housing (G);
- the driven shaft (2) being connected with a ring gear of the third planetary gear set (P3) and a spider of the second planetary gear set (P2);
- the fourth shaft (4) being permanently connected with a spider of the third planetary gear set (P3) and being connectable, via the first clutch (14), with the drive shaft (1) and being connectable, via the second brake (04), to the housing (G);
- and
- a sun gear of the first planetary gear set (P1) being non-rotatably connected with the housing (G) via a seventh shaft (0).
A multiple stage transmission of a planetary design for an automatic transmission of a motor vehicle, the multiple stage transmission comprising:
- a housing (G) accommodating:
- a drive shaft (1) and a driven shaft (2);
- a first planetary gear set (P1);
- a second planetary gear set (P2);
- a third planetary gear set (P3);
- at least third, fourth, fifth, and sixth rotatable shafts (3, 4, 5, 6) and a fixed shaft (0);
- at least first, second, third, fourth, fifth and sixth shifting elements (03, 04, 14, 15, 36, 56) including first and second brakes (03, 04) and first, second, third and fourth clutches (14, 15, 36, 56) which are selectively engageable to produce different gear ratios between the drive shaft (1) and the driven shaft (2) such that the transmission implements at least first, second, third, fourth, fifth, sixth, seventh and eighth forward gears and at least one reverse gear;
- the drive shaft (1) being permanently connected with a ring gear of the first planetary gear set (P1) and, via a second clutch (15), with the fifth shaft (5) supporting a sun gear of the second planetary gear set (P2) and a sun gear of the third planetary gear set (P3), and the fifth shaft (5) being connectable, via the fourth clutch (56), with the sixth shaft (6);
- the sixth shaft (6), adjacent a first end, being connected with a spider of the first planetary gear set (P1) and, adjacent a second end, being connectable, via the third clutch (36), with the third shaft (3) which is permanently connected with a ring gear of the second planetary gear set (P2) and being connectable, via the first brake (03), to the housing (G);
- the driven shaft (2) being connected with a ring gear of the third planetary gear set (P3) and a spider of the second planetary gear set (P2);
- the fourth shaft (4) being permanently connected with a spider of the third planetary gear set (P3) and being connectable, via the first clutch (14), with the drive shaft (1) and being connectable, via the second brake (04), to the housing (G);
- and
- a sun gear of the first planetary gear set (P1) being non-rotatably connected with the housing (G) via a seventh shaft (0).
Dependencies are inferred from the claim text.