US 8,523,728 B2Granted

Multi-speed transmission

AssigneeZF Friedrichshafen AG

InventorsMichael Kamm, Gabor Diosi, Josef Haupt, Gerhard Gumpoltsberger, Peter Ziemer, Martin Brehmer

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Abstract

The 8-speed transmission which comprises an input shaft (AN), an output shaft (AB), four planetary gearsets (RS1, RS2, RS3, RS4), eight rotary shafts (1, 2, 3, 4, 5, 6, 7, 8), and five shifting elements (A, B, C, D, E). The input shaft is directly connected to the fourth planetary gear set while the output shaft is directly connected to the third planetary gear. A third shaft directly connects one element of the first planetary gear set with one element of the fourth planetary gear set. A fifth shaft directly connects one element of the second planetary gear set with one element of the third planetary gear set. A sixth shaft directly connects one element of the first planetary gear set with one element of the third planetary gear set. A seventh shaft directly connects one element of the fourth planetary gear set with one element of the fifth shifting element.

Claims10

Dependent claims

A multi-speed automatic transmission of a planetary design for a motor vehicle, the transmission comprising:

a transmission housing;
an input shaft;
an output shaft;
a first planetary gear set, a second planetary gear set, a third planetary gear set and a fourth planetary gear set;
each of the first, the second, the third and the fourth planetary gear sets comprising three elements;
a first shifting element for releasably connecting one element of the first planetary gear set and one element of the fourth planetary gear set to the transmission housing;
a second shifting element for releasably connecting another element of the first planetary gear set to the transmission housing;
a third shifting element at least for releasably connecting one element of the third planetary gear set to the input shaft;
a fourth shifting element for releasably connecting one element of the third planetary gear set at least to one element of the second planetary gear set;
and
a fifth shifting element for releasably connecting one element of the second planetary gear set at least to one element of the fourth planetary gear set;
wherein the input shaft is directly connected to one element of the fourth planetary gear set so as to constantly rotate in unison therewith;
the output shaft is directly connected to one element of the third planetary gear set so as to constantly rotate in unison therewith;
a third shaft directly connects one element of the first planetary gear set with one element of the fourth planetary gear set;
a fifth shaft directly connects one element of the second planetary gear set with one element of the third planetary gear set;
a sixth shaft directly connects one element of the first planetary gear set with one element of the third planetary gear set;
and
a seventh shaft directly connects one element of the fourth planetary gear set with one element of the fifth shifting element.

15 more elements

A multi-speed automatic transmission of a planetary design for a motor vehicle, the transmission comprising:

a transmission housing;
an input shaft;
an output shaft;
a first planetary gear set, a second planetary gear set, a third planetary gear set and a fourth planetary gear set;
each of the first, the second, the third and the fourth planetary gear sets comprising three elements;
a first shifting element for releasably connecting one element of the first planetary gear set and one element of the fourth planetary gear set to the transmission housing;
a second shifting element for releasably connecting another element of the first planetary gear set to the transmission housing;
a third shifting element at least for releasably connecting one element of the third planetary gear set to the input shaft;
a fourth shifting element for releasably connecting one element of the third planetary gear set at least to one element of the second planetary gear set;
and
a fifth shifting element for releasably connecting one element of the second planetary gear set at least to one element of the fourth planetary gear set;
wherein the input shaft is directly connected to one element of the fourth planetary gear set so as to constantly rotate in unison therewith;
the output shaft is directly connected to one element of the third planetary gear set so as to constantly rotate in unison therewith;
a third shaft directly connects one element of the first planetary gear set with one element of the fourth planetary gear set;
a fifth shaft directly connects one element of the second planetary gear set with one element of the third planetary gear set;
a sixth shaft directly connects one element of the first planetary gear set with one element of the third planetary gear set;
a seventh shaft directly connects one element of the fourth planetary gear set with one element of the fifth shifting element;
and
the output shaft is also directly connected to one element of the fourth shifting element.

16 more elements

A multi-speed automatic transmission of a planetary design for a motor vehicle, the transmission comprising:

a transmission housing;
an input shaft;
an output shaft;
a first planetary gear set, a second planetary gear set, a third planetary gear set and a fourth planetary gear set;
each of the first, the second, the third and the fourth planetary gear sets comprising three elements;
a first shifting element for releasably connecting one element of the first planetary gear set and one element of the fourth planetary gear set to the transmission housing;
a second shifting element for releasably connecting another element of the first planetary gear set to the transmission housing;
a third shifting element at least for releasably connecting one element of the third planetary gear set to the input shaft;
a fourth shifting element for releasably connecting one element of the third planetary gear set to one element of the second planetary gear set;
and
a fifth shifting element for releasably connecting one element of the second planetary gear set at least to one element of the fourth planetary gear set;
wherein the input shaft is directly connected to one element of the fourth planetary gear set so as to constantly rotate in unison therewith;
the output shaft is directly connected to one element of the third planetary gear set so as to constantly rotate in unison therewith;
a third shaft directly connects the one element of the first planetary gear set with the one element of the fourth planetary gear set;
a fifth shaft directly connects one element of the second planetary gear set with one element of the third planetary gear set;
a sixth shaft directly connects one element of the first planetary gear set with one element of the third planetary gear set;
and
a seventh shaft directly connects one element of the fourth planetary gear set with one element of the fifth shifting element.

15 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/709,674Filed 10 Dec 2012 · division
Priority: DE 10 2006 031 2346 Jul 2006
Published: US 2013/0123060 A116 May 2013
Granted: 3 Sep 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

F16H 3/62
Using gears having orbital motion: gearings having three or more central gears
F16H 3/666
Composed of a number of gear trains without drive passing from one train to another: with intermeshing orbital gears
F16H 2200/006
Characterised by the number of forward speeds: the gear ratios comprising eight forward speeds
F16H 2200/2012
Characterised by the number of sets of orbital gears: with four sets of orbital gears

Family

Application11/773,640Parent of this division · filed 5 Jul 2007
Application12/959,976Parent of this division · filed 3 Dec 2010
Application13/179,922Parent of this division · filed 11 Jul 2011
Application13/565,242Parent of this division · filed 2 Aug 2012
US 2013/0123060 A1Pre-grant publication · published 16 May 2013
US 8,257,218 B2Parent of this division
US 7,980,986 B2Parent of this division
US 7,892,137 B2Parent of this division
US 2008/0015081 A1Published application
US 2011/0077119 A1Published application
US 2011/0263376 A1Published application
US 2012/0295755 A1Published application
US 8,506,444 B2Related patent
US 8,523,728 B2This patent

From the US filing history. Foreign family members aren’t listed.