MULTI-SPEED GEARBOX
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Accused Products
Abstract
The multi-stage transmission comprises four planetary gear sets, eight rotatable shafts and six shift elements. Sun of first set is connected to fifth shaft which is couplable, via third brake, to housing. Drive shaft is connectable, via first clutch, to fourth shaft connected to ring of first set and carrier of second set and which is couplable, via second brake, to housing. Drive shaft is connectable, via second clutch, to seventh shaft connected to carrier of fourth set and ring of third set and is connectable, via third clutch, to eighth shaft connected to sun of second set. Sixth shaft is connected to carrier of first set, ring of second set and ring of fourth set. Third shaft is connected to sun of third set and sun of fourth set and is couplable, via first brake, to housing. Drive shaft is connected to carrier of third set.
22 Citations
23 Claims
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1-7. -7. (canceled)
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8. A multi-stage transmission of a planetary design comprising:
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a drive shaft (1), an output shaft (2), first, second, third and fourth planetary gear sets (P1, P2, P3, P4) which are disposed in a housing (G), third, fourth, fifth, sixth, seventh and eight rotatable shafts (3, 4, 5, 6, 7, 8), six shift elements (03, 04, 05, 14, 17, 18), comprising brakes (03, 04, 05) and clutches (14, 17, 18), whose selective engagement producing different transmission ratios between the drive shaft (1) and the output shaft (2) so that nine forward gears and a reverse gear can be implemented, wherein the sun gear of the first planetary gear set (P1) is connected to the fifth shaft (5), and the fifth shaft (5) is couplable, via a third brake (05), to the housing (G), the drive shaft (1) is detachably connectable, via a first clutch (14), to the fourth shaft (4), to the fourth shaft (4) is connected to both the ring gear of the first planetary gear set (P1) and the carrier of the second planetary gear set (P2), and to the fourth shaft (4) which can be coupled, via a second brake (04), to the housing (G), the drive shaft (1) is detachably connectable, via a second clutch (17), to the seventh shaft (7), the seventh shaft (7) is connected to both the carrier of the fourth planetary gear set (P4) and the ring gear of the third planetary gear set (P3), and the seventh shaft (7) is detachably connectable, via a third clutch (18), to the eighth shaft (8), the eighth shaft (8) is connected to the sun gear of the second planetary gear set (P2), the sixth shaft (6) is connected to each of the carrier of the first planetary gear set (P1), the ring gear of the second planetary gear set (P2) and the ring gear of the fourth planetary gear set (P4), the third shaft (3) is connected to both the sun gear of the third planetary gear set (P3) and the sun gear of the fourth planetary gear set (P4) and the third shaft (3) is couplable, via a first brake (03), to the housing (G), and the output shaft (2) of the transmission is connected to the carrier of the third planetary gear set (P3). - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A multi-stage transmission of a planetary design comprising:
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a drive shaft, an output shaft, first, second, third and fourth planetary gear sets which are disposed in a housing, and each of the first, the second, the third and the fourth planetary gear sets comprising a sun gear, planet gears and a ring gear, third, fourth, fifth, sixth, seventh and eight rotatable shafts, six shift elements, comprising brakes and clutches whose selective engagement producing different transmission ratios between the drive shaft and the output shaft so that nine forward gears and a reverse gear can be implemented, wherein the sun gear of the first planetary gear set is connected to the fifth shaft, and the fifth shaft is couplable, via a third brake, to the housing, the drive shaft is detachably connectable, via a first clutch, to the fourth shaft, to the fourth shaft is connected to both the ring gear of the first planetary gear set and the carrier of the second planetary gear set, and to the fourth shaft which can be coupled, via a second brake, to the housing, the drive shaft is detachably connectable, via a second clutch, to the seventh shaft, the seventh shaft is connected to both the carrier of the fourth planetary gear set and the ring gear of the third planetary gear set, and the seventh shaft is detachably connectable, via a third clutch, to the eighth shaft, the eighth shaft is connected to the sun gear of the second planetary gear set, the sixth shaft is connected to each of the carrier of the first planetary gear set, the ring gear of the second planetary gear set and the ring gear of the fourth planetary gear set, the third shaft is connected to both the sun gear of the third planetary gear set and the sun gear of the fourth planetary gear set and the third shaft is couplable, via a first brake, to the housing, and the output shaft of the transmission is directly connected to the carrier of the third planetary gear set. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification