Power-shift multi-speed transmission
AssigneeRobert Bosch GmbH
InventorsTobias Schlittenbauer, Ianislav Krastev, Wael Mohamed
Life of this patent
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Abstract
The invention relates to a power-shift multi-speed transmission (10), comprising at least one stepped planet gear (20), which revolves around a first sun gear (18) and in a first ring gear (26). The first ring gear (26) is held on a lockable freewheel (28). A first planet gear step (22) of the stepped planet gear (20) revolves in the first ring gear (26), while a second planet gear step (24) revolves in a second ring gear (36), with which at least one brake (34) is associated.
Claims9
A power-shift multi-speed transmission (10), having at least one stepped planet gear (20), which revolves around a first sun gear (18) and in a first ring gear (26), characterized in that the first ring gear (26) revolves in and is directly connected to a latchable freewheel (28), and a first planet gear step (22) of the at least one stepped planet gear (20) revolves in the first ring gear (26), while a second planet gear step (24) of the at least one stepped planet gear (20) revolves in a second ring gear (36) and revolves around a second sun gear (38), wherein a first brake (34) is configured to act on the second ring gear (36) and a second brake (40) is configured to act on the second sun gear (38),
- characterized in that, with the first brake (34) closed and the freewheel (28) released, said transmission forms a first transmission ratio i_1, which is given by:
- i_1=1 ((z_h2/z_p2) (z_p1/z_s1))
- where
- z_h2:
- number of teeth of second ring gear (36)
- z_p2:
- number of teeth of second planet gear step (24)
- z_p1:
- number of teeth of first planet gear step (22)
- z_s1:
- number of teeth of first sun gear (18).
A power-shift multi-speed transmission (10), having at least one stepped planet gear (20), which revolves around a first sun gear (18) and in a first ring gear (26), characterized in that the first ring gear (26) revolves in and is directly connected to a latchable freewheel (28), and a first planet gear step (22) of the at least one stepped planet gear (20) revolves in the first ring gear (26), while a second planet gear step (24) of the at least one stepped planet gear (20) revolves in a second ring gear (36) and revolves around a second sun gear (38), wherein a first brake (34) is configured to act on the second ring gear (36) and a second brake (40) is configured to act on the second sun gear (38) characterized in that, with the first brake (34) opened and the freewheel (28) locked by a latching device (30), said transmission forms a second transmission ratio i_2, which is given by:
- i_2=1 −(z_h1/z_s1)
- where
- z_h1:
- number of teeth of first ring gear (26)
- z_s1:
- number of teeth of first sun gear (18).
A power-shift multi-speed transmission (10), having at least one stepped planet gear (20), which revolves around a first sun gear (18) and in a first ring gear (26), characterized in that the first ring gear (26) revolves in and is directly connected to a latchable freewheel (28), and a first planet gear step (22) of the at least one stepped planet gear (20) revolves in the first ring gear (26), while a second planet gear step (24) of the at least one stepped planet gear (20) revolves in a second ring gear (36) and revolves around a second sun gear (38), wherein a first brake (34) is configured to act on the second ring gear (36) and a second brake (40) is configured to act on the second sun gear (38), characterized in that, with the first brake (34) opened, the second brake (40) closed and the freewheel (28) released, said transmission forms a reverse gear in the transmission ratio i_R, which is given by:
- i_R=1 −((z_s2/z_p2) (z_p1/z_s1))
- where
- z_s2:
- number of teeth of second sun gear (38)
- z_p2:
- number of teeth of second planet gear step (24)
- z_p1:
- number of teeth of first planet gear step (22)
- z_s1:
- number of teeth of first sun gear (18).
A power-shift multi-speed transmission (10), having at least one stepped planet gear (20), which revolves around a first sun gear (18) and in a first ring gear (26), characterized in that the first ring gear (26) revolves in and is directly connected to a latchable freewheel (28), and a first planet gear step (22) of the at least one stepped planet gear (20) revolves in the first ring gear (26), while a second planet gear step (24) of the at least one stepped planet gear (20) revolves in a second ring gear (36) and revolves around a second sun gear (38), wherein a first brake (34) is configured to act on the second ring gear (36) and a second brake (40) is configured to act on the second sun gear (38), characterized in that, with the first brake (34) closed and the second brake (40) closed or with the first brake (34) closed and the freewheel (28) locked by means of a latching device (30), the power-shift multi-speed transmission (10) performs a parking lock function.
Dependencies are inferred from the claim text.