Transmission for a motor vehicle

Patent metadata

Field	Value
Publication number	US-9334930-B2
Application number	US-201414260864-A
Country	US
Kind code	B2
Filing date	Apr 24, 2014
Priority date	Jun 6, 2013
Publication date	May 10, 2016
Grant date	May 10, 2016

Abstract

A transmission having input and output shafts, shifting elements and planetary gearsets including sun and ring gears, planetary gearwheels and a carrier. The carrier of the first gearset is fixed to the input. The ring gear of the second gearset can be connected by a first shifting element to the housing and by a second shifting element to the carrier of the second gearset. The ring gear of the first gearset is fixed to the sun gear of the second gearset. The sun gear of the first gearset can be connected by a third shifting element to the housing, or is fixed to the sun gear of the second gearset and the ring gear of the first gearset can be connected by a third shifting element fixed to the housing. The shifting elements are arranged within the housing and accessible from outside the housing.

First claim

The invention claimed is:

1. A transmission ( 1 ), for a motor vehicle, the transmission ( 1 ) comprising;
a housing (G),
a drive input shaft (AN),
a drive output shaft (AW),
a plurality of shifting elements (A to Y) including at least a first shifting element (E), a second shifting element (F), and a third shifting element (B, K 1 ),
a first partial transmission (TG 1 ) being formed by at least first and second planetary gearsets (PG 1 , PG 4 ),
a third planetary gearset (PG 2 ) and a fourth planetary gearset (PG 3 ),
a second partial transmission (TG 2 ),
being formed by at least the second planetary gearset (PG 4 ) together with at least one further planetary gearset or one intermediate gear system such that the second planetary gearset (PG 4 ) acts as a range group used in common by both of the first and the second partial transmissions (TG 1 ,TG 2 ),
the first arid the second planetary gearsets (PG 1 , PG 4 ) each comprise a sun gear ( 101 , 104 ), at least one planetary gearwheel ( 111 , 114 ), a planetary carrier ( 121 , 124 ) and a ring gear ( 131 , 134 ),
the carrier ( 121 ) of the first planetary gearset (PG 1 ) being connected in a rotationally fixed manner to the drive input shaft (GW 1 , AN),
the carrier ( 124 ) of the second planetary gearset (PG 4 ) being directly connected to the drive output shaft (AW),
the ring gear ( 134 ) of the second planetary gearset (PG 4 ) being directly connectable to the housing (G) by the first shifting element (E),
the ring gear ( 134 ) of the second planetary gearset (PG 4 ) being directly connectable to the carrier ( 124 ) of the second planetary gearset (PG 4 ) and the drive output shaft (AW) solely by engagement of only the second shifting element (F),
the transmission further comprising either:
a first combination in which the ring gear ( 131 ) of the first planetary gearset (PG 1 ) being rotationally fixedly connected to the sun gear ( 104 ) of the second planetary gearset (PG 4 ) and the sun gear ( 101 ) of the first planetary gearset (PG 1 ) being connectable by at least the third shifting element (B, K 1 ) to the housing (G), or
a second combination in which the sun gear ( 101 ) of the first planetary gearset (PG 1 ) being rotationally fixedly connected to the sun gear ( 104 ) of the second planetary gearset (PG 4 ) and the ring gear ( 131 ) of the first planetary gearset (PG 1 ) being connectable by at least the third shifting element (B, K 1 ) fixed to the housing (G), and

a majority of the plurality of shifting elements (A, V, R, E, F, B, KO, K 1 ) are arranged in the housing (G) so as to be accessible from outside the transmission.

2. The transmission according to claim 1 , wherein the transmission has the first combination, and the transmission further comprises at least one further planetary gearset (PG 2 , PG 3 , PG 5 , PG 6 ) such that the transmission further comprises at least one of:
a first arrangement in which at least two of the first, the second and
the third planetary gearsets (PG 1 , PG 2 , PG 3 , PG 4 , PG 5 , PG 6 ) are geometrically arranged, one behind another, in the transmission ( 1 ), and
a second arrangement in which at least two of the second, the third, the fourth, a fifth and a sixth planetary gearsets (PG 3 , PG 4 ; PG 5 , PG 6 ) are arranged, nested one inside another, such that either:
the second planetary gearset (PG 4 ) is arranged inside the fourth planetary gearset (PG 3 ), or
the fifth planetary gearset (PG 5 ) is arranged inside the sixth planetary gearset (PG 6 ).

3. The transmission according to claim 1 , wherein the transmission has the first combination,
the third planetary gearset (PG 2 ) is arranged either between the first and the second planetary gearsets (PG 1 , PG 4 ) or between the first and the fourth planetary gearsets (PG 1 , PG 3 ), and
a sun gear ( 102 ) of the third planetary gearset (PG 2 ) is either connected to the housing (G) or is connectable to the housing (G) by a fourth shifting element (B 2 , C).

4. The transmission according to claim 1 , wherein the transmission has the first combination, and the transmission further includes a fourth shifting element (B 2 , C) which is either a frictional brake (B 2 ) or an interlocking shifting element (C).

5. The transmission according to claim 2 , wherein a carrier ( 122 ) of the third planetary gearset (PG 2 ) is either connected to the carrier ( 121 ) of the first planetary gearset (PG 1 ) in a rotationally fixed manner, or is connectable to the carrier ( 121 ) of the first planetary gearset (PG 1 ) by at least a fourth shifting element (K 2 , X, Y, D).

6. The transmission according to claim 5 , wherein the transmission further comprises an electric machine (EM) for actuating the fifth shifting element (K 2 , X, Y, D).

7. The transmission according to claim 2 , wherein a sun gear ( 103 ) of the fourth planetary gearset (PG 3 ) is at least one of:
either fixedly connected to the housing (G) or is fixedly connectable relative to the housing (G) by a fourth shifting element (K, D, C), and
either connectable by a fifth shifting element (J) to a ring gear ( 133 ) of the fourth planetary gearset (PG 3 ) or is rotationally fixedly connected to a ring gear ( 132 ) of the third planetary gearset (PG 2 ).

8. The transmission according to claim 2 , wherein a carrier ( 123 ) of the fourth planetary gearset (PG 3 ) is at least one of:
either rotationally fixedly connected to the carrier ( 124 ) of the second planetary gearset (PG 4 ) or connectable to the carrier ( 124 ) of the second planetary gearset (PG 4 ) by a fourth shifting element (D), and
connectable to the carrier ( 121 ) of the first planetary gearset (PG 1 ) by an additional shifting element (K 2 ).

9. The transmission according to claim 2 , wherein the fifth planetary gearset (PG 5 ) and the sixth planetary gearset (PG 6 ) are arranged in a nested manner and form a reversing gear group for provision of at least one reversing gear (R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 ),
the reversing gear group is arranged at an output of the transmission ( 1 ),
a sun gear ( 105 ) of the fifth planetary gearset (PG 5 ) is connected in a rotationally fixed manner to the carrier ( 124 ) of the second planetary gearset (PG 4 ) and a carrier ( 125 ) of the fifth planetary gearset (PG 5 ) is fixedly connectable to the housing (G) by a shifting element (R) for a first reversing gear, and
a sun gear ( 106 ) of the sixth planetary gearset (PG 6 ) is fixedly connectable to the housing (G) by another shifting element (L) and is connectable to the carrier ( 125 ) of the fifth planetary gearset (PG 5 ) by a further shifting element (H).

10. The transmission according to claim 2 , wherein the fifth planetary gearset (PG 5 ) is arranged at an input of the transmission ( 1 ) and a sun gear ( 105 ) of the fifth planetary gearset (PG 5 ) is connected, in a rotationally fixed manner, to the drive input shaft (AN), and a carrier ( 125 ) of the fifth planetary gearset (PG 5 ) is either:
fixedly connectably to the housing (G) by an additional shifting element (R) to provide at least one reversing gear (R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 ), or
connectable to the drive input shaft (AN) by a further shifting element (V) to provide at least one forward gear (V 1 , V 2 , V 3 , V 4 , V 5 , V 6 , V 7 , V 8 , V 9 , V 10 , V 11 , V 12 , V 13 , V 14 ).

11. The transmission according to claim 1 , wherein an intermediate gear system (VG 3 ) forms a part of the second partial transmission (TG 2 ), and the intermediate gear system (VG 3 ) comprises at least one countershaft (VW 1 ) and at least two wheel planes (I, II, III).

12. The transmission according to claim 1

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Kaltenbach Johannes

Classifications

• F16H2200/0078

  the gear ratio comprising twelve or more forward speeds · CPC title

• F16H3/66 Primary

  composed of a number of gear trains without drive passing from one train to another · CPC title

• F16H2200/2094

  using positive clutches, e.g. dog clutches · CPC title

• F16H2200/2051

  with eight engaging means · CPC title

• F16H2200/2064

  using at least one positive clutch, e.g. dog clutch · CPC title