Multi-speed gearbox
First Claim
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1. A multi-stage transmission of a planetary design comprising:
- 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, six, seventh and eighth rotatable shafts (3, 4, 5, 6, 7, 8), andsix shift elements (03, 04, 05, 15, 17, 18) comprising brakes (03, 04, 05) and clutches (15, 17, 18) whose selective engagement produces 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) can be detachably connected, via a first clutch (15), to the drive shaft (1), and the fifth shaft (5) can be coupled, via a third brake (05), to the housing (G),the drive shaft (1) can be detachably connected, 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) can be detachably connected, via a third clutch (18), to the eighth shaft (8), and the eighth shaft (8) is connected to the sun gear of the second planetary gear set (P2),the sixth shaft (6) is connected to the ring gear of the first planetary gear set (P1), the carrier 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) can be coupled, via a first brake (03), to the housing (G),the fourth shaft (4) is connected to both the carrier of the first planetary gear set (P1) and the ring gear of the second planetary gear set (P2) and the fourth shaft (4) can be coupled, via a second brake (04), to the housing (G), andthe output shaft (2) is connected to the carrier of the third planetary gear set (P3).
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Abstract
Multi-stage transmission comprises four planetary gear sets, rotatable shafts and six shift elements. Sun of first set is connected to fifth shaft which is connectable, via first clutch, to drive shaft and is couplable, via third brake, to housing. Drive shaft is connectable, via second clutch, to seventh shaft which is connectable to carrier of fourth set and ring of third set and is connectable, via third clutch, to eighth shaft which is connected to sun of second. Sixth shaft is connected to ring of first set, carrier of second set and ring of fourth set. Third shaft is connected to sun of third set and sun of fourth set and can be coupled, via first brake, to housing. Fourth shaft is connected to carrier of first set and ring of second set and is couplable, via second brake, to housing. Drive shaft is connected to carrier of third set.
42 Citations
16 Claims
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1. 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, six, seventh and eighth rotatable shafts (3, 4, 5, 6, 7, 8), and six shift elements (03, 04, 05, 15, 17, 18) comprising brakes (03, 04, 05) and clutches (15, 17, 18) whose selective engagement produces 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) can be detachably connected, via a first clutch (15), to the drive shaft (1), and the fifth shaft (5) can be coupled, via a third brake (05), to the housing (G), the drive shaft (1) can be detachably connected, 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) can be detachably connected, via a third clutch (18), to the eighth shaft (8), and the eighth shaft (8) is connected to the sun gear of the second planetary gear set (P2), the sixth shaft (6) is connected to the ring gear of the first planetary gear set (P1), the carrier 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) can be coupled, via a first brake (03), to the housing (G), the fourth shaft (4) is connected to both the carrier of the first planetary gear set (P1) and the ring gear of the second planetary gear set (P2) and the fourth shaft (4) can be coupled, via a second brake (04), to the housing (G), and the output shaft (2) is connected to the carrier of the third planetary gear set (P3). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. 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, third, fourth, fifth, six, seventh and eighth rotatable shafts, and six shift elements comprising brakes and clutches whose selective engagement produces 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 can be detachably connected, via a first clutch, to the drive shaft, and the fifth shaft can be coupled, via a third brake, to the housing, the drive shaft can be detachably connected, 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 can be detachably connected, via a third clutch, to the eighth shaft, and the eighth shaft is connected to the sun gear of the second planetary gear set, the sixth shaft is connected to the ring gear of the first planetary gear set, the carrier 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 can be coupled, via a first brake, to the housing, the fourth shaft is connected to both the carrier of the first planetary gear set and the ring gear of the second planetary gear set and the fourth shaft can be coupled, via a second brake, to the housing, and the output shaft is directly connected to the carrier of the third planetary gear set. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification
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Current AssigneeZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
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Original AssigneeZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
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InventorsBeck, Stefan, Sibla, Christian, Rieger, Wolfgang
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Primary Examiner(s)Wright, Dirk
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Application NumberUS14/396,076Publication NumberTime in Patent Office1,077 DaysField of SearchNoneUS Class Current1/1CPC Class CodesF16H 2003/445 without permanent connectio...F16H 2200/0065 the gear ratios comprising ...F16H 2200/0082 characterised by the number...F16H 2200/2012 with four sets of orbital g...F16H 2200/2046 with six engaging meansF16H 2200/2094 using positive clutches, e....F16H 2200/2097 comprising an orbital gear ...F16H 3/66 composed of a number of gea...
