Transmission
AssigneeZF Friedrichshafen AG
InventorsStefan Beck, Christian Sibla, Martin Brehmer, Josef Haupt
Life of this patent
Estimating the term…
Abstract
A transmission (G) is provided with four planetary gear sets (P1, P2, P3, P4), several shafts (W1-W8) and a first, second, third, fourth and fifth shift element (B1, B2, K1, K2, K3), the selective meshing of which brings about different transmission ratio relationships between a transmission input shaft (GW1) and a transmission output shaft (GW2). The second shift element (B2) and/or the fifth shift element (K3) is arranged, in a series at a sixth shift element (K4), in the power flow between the fifth shaft (W5) and a sun gear (So-P4) of the fourth planetary gear set (P4).
Claims18
A transmission (G), comprising:
- four planetary gear sets (P1, P2, P3, P4), a plurality of shafts (W1-W8), and a first, second, third, fourth and fifth shift element (B1, B2, K1, K2, K3), wherein the selective meshing of the shift elements brings about different transmission ratio relationships between a transmission input shaft (GW1) and a transmission output shaft (GW2);
- a first one of the shafts (W1) constantly connected to the transmission input shaft (GW1) and to a bar (St-P3) of the third planetary gear set (P3);
- a second one of the shafts (W2) constantly connected to the transmission output shaft (GW2) and to a bar (St-P1) of the first planetary gear set (P1);
- a third one of the shafts (W3) constantly connected to a sun gear (So-P3) of the third planetary gear set (P3) and fixable in a torque-proof manner through the first shift element (B1);
- a fifth one of the shafts (W5) constantly connected to a ring gear (Ho-P2) of the second planetary gear set (P2);
- a sixth one of the shafts (W6) constantly connected to a ring gear (Ho-P1) of the first planetary gear set (P1);
- a ring gear (Ho-P3) of the third planetary gear set (P3) constantly connected to a sun gear (So-P2) of the second planetary gear set (P2) and forming a component of a seventh one of the shafts (W7);
- an eighth one of the shafts (W8) constantly connected to a bar (St-P2) of the second planetary gear set (P2);
- two elements of the second planetary gear set (P2) connected to each other through the fourth shift element (K2), such that, with a locked fourth shift element (K2), the ring gear (Ho-P2), the bar (St-P2) and the sun gear (So-P2) have the same rotational speed;
- and
- one of the second shift element (B2) or the fifth shift element (K3) arranged in series with a sixth shift element (K4) in the power flow between the fifth shaft (W5) and a sun gear (So-P4) of the fourth planetary gear set (P4).
Dependencies are inferred from the claim text.