EP2841802A1

EP2841802A1 - Multi-speed gearbox

Info

Publication number: EP2841802A1
Application number: EP13709419.9A
Authority: EP
Inventors: Stefan Beck; Christian Sibla; Wolfgang Rieger
Original assignee: ZF Friedrichshafen AG
Current assignee: ZF Friedrichshafen AG
Priority date: 2012-04-27
Filing date: 2013-03-13
Publication date: 2015-03-04
Also published as: US9194464B2; CN104204611A; US20150094185A1; CN104204611B; DE102012207081A1; DE102012207081B4; WO2013159989A1

Abstract

The invention relates a four-speed multi-speed gearbox in which a ring gear (13) of a first planetary gear set (1) is connected to a sun gear (41) of a fourth planetary gear set (4), a ring gear (43) of the fourth planetary gear set (4) is connected to the output shaft (71), a sun gear (11) of the first planetary gear set (1) and a planet carrier (22) of a second planetary gear set (2) can be coupled to the housing (72) by means of a first brake (51), a planet carrier (12) of the first planetary gear set (1) can be coupled to the housing (72) by means of a second brake (52), and the drive shaft (70) can be coupled to the planet carrier (42) of the fourth planetary gear set (4) by means of a first clutch (61) and a ring gear (43) can be coupled to the sun gear (41) of the fourth planetary gear set (4) by means of a first clutch (62). By varying other clutches within the multi-speed gearbox, a set of gearboxes which have similar characteristics are provided.

Description

Mehrstufenqetriebe

The invention relates to a multi-speed planetary gear, in particular for a motor vehicle.

Such multistage transmissions are preferably used as automatic transmissions of motor vehicles, wherein the power flow which is effective in the respective gear ratio within the planetary gear sets is defined by a specific actuation of the shifting elements. The planetary gear sets are usually also connected in an automatic transmission with a slipping action underlying and optionally provided with a lock-up clutch starting element, such as about a hydrodynamic torque converter or a fluid coupling.

From DE 10 2008 000 428 A1 a multi-speed transmission in planetary construction is known, in which four planetary gear sets, and a total of eight rotatable shafts are arranged, one of which represents the drive shaft and another the output shaft of the multi-speed transmission. Furthermore, at least six switching elements are provided in the region of the shafts, by means of whose targeted actuation the power flow within the four planetary gear sets varies and thus different gear ratios between the input and output shafts can be defined. Altogether this means nine forward gears and one reverse gear can be engaged.

The object of the invention is to provide an alternative multi-step transmission, preferably with improved efficiency and sufficiently large and sufficiently uniformly distributed translation series.

The object of the invention is achieved by a multistage transmission according to claim 1. In particular, by a multi-stage transmission, comprising at least four planetary gear sets, a housing, a drive shaft and an output shaft, wherein a ring gear of a first planetary gear set with a sun gear of a four-wheel drive th planetary gear set is constantly connected,

a ring gear of the fourth planetary gear set is continuously connected to the output shaft,

a sun gear of the first planetary gear set and a web of a second planetary gear set can be coupled to the housing via a first brake,

a web of the first planetary gear set can be coupled to the housing via a second brake,

the web with the sun gear, the ring gear with the sun gear or the ring gear with the web of each of the third planetary gear set or the drive shaft with the web of the fourth planetary gear set can be coupled via a first clutch, a ring gear with the sun gear or the ring gear with the web or Sun gear to the web of each of the fourth planetary gear set can be coupled via a second clutch and three of the following five compounds constantly and two of said compounds by means of at least one switching element are designed to be detachable:

Connection of the drive shaft with a sun gear of the second planetary gear set,

Connecting the drive shaft to a sun gear of a third planetary gear set,

Connection of a ring gear of the third planetary gear set with the web of the second planetary gear set,

Connection of a web of the third planetary gear set with the web of the fourth planetary gear and

Connecting a ring gear of the first planetary gear set with a ring gear of the second planetary gear set.

A planetary gear set is understood to mean, in particular, a wheel set which comprises at least one sun gear, in that one or more planetary gears mesh, a web which determines the axes of the planetary gears and a ring gear in which the planetary gears mesh. Preferably, the ring gear has an internal toothing and the sun gear has an external toothing. An advantage of the invention may be that the switching elements of the multi-speed transmission, so the gearbox-side brakes and clutches, are easily accessible from the outside. Thus, the actuators such as electric motors, hydraulic valves, hydraulic pumps and the like may be disposed in the vicinity of the switching elements, whereby mechanical and / or hydraulic losses are reduced and a lower energy for the actuation of the switching element may be necessary. Also, less energy may be necessary to keep the switching element in its respective current operating state, ie open or closed, for example, because short lines and the pressure losses are lower. It is also possible to arrange switching elements on the housing and thus at least partially against rotation, whereby seals which connect a stationary line with a rotating line, can be avoided in whole or in part.

Also, the spatial arrangement of the easily accessible switching elements simplifies the replacement of the usual hydraulically actuated multi-plate clutches or - brakes by, for example, electro-mechanical or electro-hydraulically actuated brakes and clutches, which are comparatively easy to use driven. Well achievable switching elements are on the one hand brakes, which rotatably couple a shaft with the housing, but also switching elements on outer shafts of the multi-speed transmission, preferably on input or output shaft, which can be supplied comparatively easy to operate hydraulic fluid.

In addition to this property, the multi-speed transmission also has a good toothing efficiency, only small loads on the components, in particular low Planetenensatz- and switching element moments, low absolute and relative speeds and / or low construction costs. The latter allows the realization of the multi-speed transmission with only low weight and low cost. Finally, the multi-speed transmission also allows a good translation series, so a well usable gradation of the gears.

Generally, a preferred embodiment of the multi-speed transmission includes four planetary gear sets, four clutches, two brakes, and no fixed housing coupling. By pressing two switching elements (brakes and / or clutches), nine forward gears and one reverse gear can be shifted, with another alternative shift position being available for the fifth gear. In addition, the transmission allows the circuit of an additional forward gear and an additional reverse gear.

As starting elements, a hydrodynamic torque converter, a hydrodynamic clutch, an additional starting clutch, an integrated starting clutch or brake and / or an additional electric motor can be used.

In principle, an electric motor or another power / power source can be arranged on each shaft. Desweitern can be arranged on each shaft in principle a freewheel to the housing or to another shaft.

Preferably, the multi-speed transmission is realized as a standard drive, but also conceivable is a front-transverse construction.

All switching elements can act frictionally or positively. Preferably, however, the second clutch and / or the fourth clutch (in other transmission variants, the fifth or sixth clutch instead of the fourth clutch) as positive clutches, in particular as jaw clutches executed, resulting in a significantly improved efficiency and thus significant fuel consumption.

It was recognized that the second and the fourth clutch (fifth or sixth clutch) must be actuated only once when switching from the first to the ninth gear and therefore that these switching elements are particularly suitable to be designed as a dog clutch. It has thus been further recognized that the advantage of better efficiency outweighs the disadvantage of more difficult handling in these switching elements due to their comparatively rare operation. The geometric position (order) of the individual wheelsets and switching elements is freely selectable, as long as it allows the bindability of the elements. Thus, individual elements can be moved arbitrarily in their position.

Further advantageous variants of the multi-speed transmission result from the subclaims and from the description in conjunction with the figures. These all have the same functional properties as the main system, in particular similar efficiency, similar gradation, etc.

For a better understanding of the invention, this will be explained in more detail with reference to the following figures.

Each shows in a highly schematically simplified representation:

1 shows a first schematically illustrated exemplary variant of a multi-speed transmission according to the invention;

FIG. 2 shows a second schematically illustrated exemplary variant of a multistage transmission according to the invention; FIG.

3 shows a third schematically illustrated exemplary variant of a multistage transmission according to the invention;

4 shows a fourth schematically illustrated exemplary variant of a multistage transmission according to the invention;

5 shows a fifth schematically illustrated exemplary variant of a multistage transmission according to the invention;

6 shows a sixth exemplary illustrated variant of a multi-speed transmission according to the invention; 7 shows a seventh schematically illustrated exemplary variant of a multi-speed transmission according to the invention;

8 shows an eighth schematically illustrated exemplary variant of a multistage transmission according to the invention;

9 shows a ninth schematically illustrated exemplary variant of a multistage transmission according to the invention;

Fig. 10 shows a tenth schematically illustrated exemplary variant of a multi-speed transmission according to the invention and

Fig. 1 1 is a table which indicates the closed switching elements for the transmission variants shown in Figures 1 to 3 in each gear stage.

By way of introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numerals or the same component names, wherein the disclosures contained in the entire description can be mutatis mutandis to the same parts with the same reference numerals or component names. Also, the location information chosen in the description, such as top, bottom, side, etc. related to the immediately described and illustrated figure and are to be transferred to the new situation mutatis mutandis when a change in position. Furthermore, individual features or combinations of features from the illustrated and described different embodiments may represent for themselves, inventive or inventive solutions.

1 shows a multi-speed transmission comprising four planetary gear sets 1, 2, 3, 4, a drive shaft 70, an output shaft 71, six further rotatable shafts 73, 74, 75, 76, 77, 78, six switching elements 51, 52, 61, 62, 63, 64, of which two brakes 51, 52 and four clutches 61, 62, 63, 64. The four planetary gear sets 1, 2, 3, 4 are fourth in the order of the first planetary gear set 1, second planetary gear set 2, third planetary gear set 3 Planetary gear 4 arranged one behind the other. The first Planetary gear set 1 is a Plusplanetenradsatz, the second planetary gear set 2, the third planetary gear set 3 and the fourth planetary gear set 4 are formed as minus planetary gear set. The planetary gear sets 1, 2, 3, 4, are jointly surrounded by a housing 72. In the variant of the multi-speed transmission of Figure 1 are

a ring gear 13 of a first planetary gear set 1 is continuously connected to a sun gear 41 of a fourth planetary gear set 4,

a ring gear 43 of the fourth planetary gear set 4 is continuously connected to the output shaft 71,

a sun gear 1 1 of the first planetary gear set 1 and a web 22 of a second planetary gear set 2 can be coupled to the housing 72 via a first brake 51, a web 12 of the first planetary gear set 1 can be coupled to the housing 72 via a second brake 52,

the web 32 of the third planetary gear set 3 or the drive shaft 70 can be coupled to the web 42 of the fourth planetary gear set 4 with the output shaft 70 via a first coupling 61,

a ring gear 43 can be coupled to the sun gear 41 of the fourth planetary gearset 4 via a second clutch 62,

the drive shaft 70 can be coupled to the sun gear 21 of the second planetary gear set 2 via a third clutch 63,

the drive shaft 70 can be coupled to the sun gear 31 of the third planetary gear set 3 via a fourth clutch 64,

the ring gear 33 of the third planetary gear set 3 is permanently connected to the web 22 of the second planetary gear set 2,

the web 32 of the third planetary gear set 3 with the web 42 of the fourth planetary gear set 4 is constantly connected and

the ring gear 13 of the first planetary gear set 1 with the ring gear 23 of the second planetary gear set 2 constantly connected.

Fig. 2 shows a multi-stage transmission which is very similar to the multi-speed transmission of Fig. 1 and differs in the following points from the embodiment of Fig. 1:

the sun gear 41 of the fourth planetary gear set 4 is not connected to the hollow Rad 43 of the fourth planetary gear set 4 but with the web 42 of the fourth planetary gear set 4 via a second clutch 62 coupled.

3 shows a multi-stage transmission, which is very similar to the multi-stage transmission of FIG. 1 and differs from the embodiment of FIG. 1 in the following points:

the ring gear 43 of the fourth planetary gear 4 is not coupled to the sun gear 41 of the fourth planetary gear 4 but with the web 42 of the fourth planetary gear set 4 via a second clutch 62.

It should be noted at this point that the variants shown in FIGS. 2 and 3 with regard to the position of the second clutch 62 are also applicable to the following transmission variants. That is, the second clutch 62 is not necessarily arranged between the ring gear 43 and the sun gear 41 in the following transmission variants, but may also be arranged between the sun gear 41 and the web 42 or between the ring gear 43 and the web 41.

4 shows a multistage transmission, which is very similar to the multistage transmission of FIG. 1 and differs from the embodiment of FIG. 1 in the following points:

the drive shaft 70 is permanently connected to the sun gear 31 of the third planetary gear set 3 and

the ring gear 33 of the third planetary gear set 3 can be coupled to the web 22 of the second planetary gear set 2 via a fifth clutch 65.

FIG. 5 shows a multistage transmission, which is very similar to the multistage transmission of FIG. 4 and differs from the embodiment of FIG. 4 in the following points:

the sun gear 31 of the third planetary gear set 3 can not be coupled to the web 32 of the third planetary gear set 3 but to the ring gear 33 of the third planetary gear set 3 via a first clutch 61.

Fig. 6 shows a multi-speed transmission, which is the multi-speed transmission 4 is very similar and differs from the embodiment of FIG. 4 in the following points:

the web 32 of the third planetary gear set 3 can not be coupled to the sun gear 31 of the third planetary gear set 3 but to the ring gear 33 of the third planetary gear set 3 via a first clutch 61.

It should be noted at this point that the variants shown in FIGS. 5 and 6 with regard to the position of the first clutch 61 can also be applied to the transmission variant illustrated in FIG. 9. That is, the first clutch 61 is not necessarily arranged in this transmission variant between the sun gear 31 and the web 32, but may also be arranged between the sun gear 31 and the ring gear 33 or between the ring gear 33 and the web 32.

Fig. 7 shows a multi-stage transmission, which is very similar to the multi-stage transmission of Fig. 1 and differs in the following points from the embodiment of Fig. 1:

the web 32 of the third planetary gear set 3 can be coupled to the web 42 of the fourth planetary gear set 4 and the shaft 78 via a sixth clutch 66.

FIG. 8 shows a multistage transmission comprising four planetary gear sets 1, 2, 3, 4, a drive shaft 70, an output shaft 71, three further rotatable shafts 73, 74, 75, six shift elements 51, 52, 61, 62, 63, 64 thereof two brakes 51, 52 and four clutches 61, 62, 63, 64. The four planetary gear sets 1, 2, 3, 4 are arranged one behind the other in the order of the first planetary gear set 1, second planetary gear set 2, third planetary gear set 3, fourth planetary gear set 4. The first planetary gear set 1 is a plus planetary gear set, the second planetary gear set 2, the third planetary gear set 3 and the fourth planetary gear set 4 are designed as a minus planetary gearset. The planetary gear sets 1, 2, 3, 4, are jointly surrounded by a housing 72. In the variant of the multi-speed transmission of Figure 1 are

a ring gear 13 of a first planetary gear set 1 is continuously connected to a sun gear 41 of a fourth planetary gear set 4, a ring gear 43 of the fourth planetary gear set 4 is continuously connected to the output shaft 71,

the web 32 with the sun gear 31, the ring gear 33 with the sun gear 31 or the ring gear 33 with the web 32 of each of the third planetary gear set 3 or the drive shaft 70 with the web 42 of the fourth planetary gear set 4 via a first clutch 61 coupled

a ring gear 43 with the sun gear 41 or the ring gear 43 with the web 42 or the sun gear 41 with the web 42 of each of the fourth planetary gear 4 via a second clutch 62 coupled,

the drive shaft 70 is continuously connected to the sun gear 21 of the second planetary gear set 2,

the ring gear 13 of the first planetary gear set 1 can be coupled to the ring gear 23 of the second planetary gear set 2 via a seventh clutch 67.

9 shows a multistage transmission, which is very similar to the multistage transmission of FIG. 8 and differs from the embodiment of FIG. 8 in the following points:

the ring gear 33 of the third planetary gear set 3 can be coupled to the web 22 of the second planetary gear set 2 via a fifth clutch 65. 10 shows a multistage transmission, which is very similar to the multistage transmission of FIG. 8 and differs from the embodiment of FIG. 8 in the following points:

In all multi-speed transmissions illustrated in FIGS. 1, 2 and 3, the following gears may be shiftable:

A first gear can be realized by the closed first brake 51, the closed second clutch 62 and the closed fourth clutch 64.

A second gear can be realized by the closed first brake 51, the closed second brake 52 and the closed fourth clutch 64.

A third gear can be realized by the closed first brake 51, the closed third clutch 63 and the closed fourth clutch 64.

A fourth gear can be realized by the closed second brake 52, the closed third clutch 63 and the closed fourth clutch 64.

A fifth gear is through the closed first clutch 61, the closed third clutch 63 and the closed fourth clutch 64, or

by the closed first clutch 61, the closed second clutch 62 and the closed fourth clutch 64 can be realized.

A sixth gear can be realized by the closed second brake 52, the closed first clutch 61 and the closed fourth clutch 64.

A seventh gear can be realized by the closed second brake 52, the closed first clutch 61 and the closed third clutch 63.

An eighth gear can be realized by the closed first brake 51, the closed second brake 52 and the closed first clutch 61.

A ninth gear can be realized by the closed first brake 51, the closed first clutch 61 and the closed third clutch 63.

A reverse gear can be realized by the closed first brake 51, the closed second clutch 62 and the closed third clutch 63.

An additional forward gear is provided by the closed second brake 52, which is closed. second clutch 62 and the closed third clutch 63 feasible. An additional return gear can be realized by the closed second brake 52, the closed second clutch 62 and the closed fourth clutch 64.

The switching elements not mentioned in each case are opened.

This is also shown in the table in Figure 1 1, which also represents the ratios of the respective gear stages.

The switching positions of the multi-speed transmission illustrated in FIGS. 4 to 6 are quite similar to those of the multi-speed transmission shown in FIGS. 1 to 3, but the fifth clutch 65 takes the place of the fourth clutch 64.

The shift positions of the multi-speed transmission illustrated in FIG. 7 are similar to those of the multi-speed transmission shown in FIGS. 1 to 3, but the sixth clutch 66 takes the place of the fourth clutch 64.

The shift positions of the multi-speed transmission illustrated in FIG. 8 are similar to those of the multi-speed transmission shown in FIGS. 1 to 3, but the seventh clutch 67 replaces the third clutch 63.

The shift positions of the multi-speed transmission illustrated in FIG. 9 are similar to those of the multi-speed transmission shown in FIG. 8, but the fifth clutch 65 replaces the fourth clutch 64.

The shift positions of the multi-speed transmission shown in FIG. 10 are quite similar to those of the multi-speed transmission shown in FIG. 8, but the sixth clutch 66 takes the place of the fourth clutch 64.

Preferably, in the multi-speed transmissions shown, the first wheel set 1 is designed as a plus wheel set and the remaining wheel sets 2, 3, 4 as minus wheel sets.

In an advantageous variant, the transmission ratio is:

of the first set of wheels 1 between sun gear 1 1 and ring gear 13 +1, 600th and or

of the second set of wheels 2 between sun gear 21 and ring gear 23 -3,200 and / or

of the third set of wheels 3 between sun gear 31 and ring gear 33 -3,700 and / or

of the fourth gear 4 between the sun gear 41 and ring gear 43 -1, 600 is.

In general, instead of a first mentioned connection / coupling to a web 12, 22, 32, 42 of a wheel set 1, 2, 3, 4 and a second mentioned connection / coupling to a ring gear 13, 23, 33, 43 of this wheelset 1, 2nd , 3, 4 the first mentioned connection / coupling to said ring gear 13, 23, 33, 43 of this wheel set 1, 2, 3, 4 and the second said connection / coupling to said web 12, 22, 32, 42 of this wheel set 1, 2, 3, 4 executed, this wheelset 1, 2, 3, 4 instead of a minus wheel as a plus wheel or instead as plus wheel as a negative wheel is executed. In other words, the connections / couplings to the web 12, 22, 32, 42 and the ring gear 13, 23, 33, 43 of a wheelset 1, 2, 3, 4 exchanged and the direction of rotation between the sun gear 1 1, 21, 31, 41 and ring gear 13, 23, 33, 43 of this wheel 1, 2, 3, 4 vice versa. In the design of the multi-speed transmission is in addition to ensure that the amount of stationary translation of this wheelset is increased by 1 or decreased by 1, if the switchable ratios between drive 70 and output 71 otherwise remain the same. By said variation of the wheelsets 1, 2, 3, 4 so the connection / coupling between the individual transmission elements can be changed without changing the characteristics of the transmission. This is a variety of structural configurations available, which can simplify the realization of the transmission in an individual case. The mentioned permutation of the connection / coupling is not limited to a wheelset 1, 2, 3, 4, but can also be applied to several wheelsets 1, 2, 3, 4 at the same time.

The embodiments show possible embodiments of a multi-speed transmission according to the invention, it being noted at this point that the Invention is not limited to the specifically illustrated embodiments thereof, but also various combinations of the individual embodiments are mutually possible and this variation possibility due to the doctrine of technical action by objective invention in the skill of working in this technical field expert. In particular, the possibilities resulting from the combinatorics and the patent claim 1, but not explicitly illustrated in the figures, are also included in the scope of protection. In addition, all conceivable embodiments, which are possible by combinations of individual details of the embodiment variant shown and described, are also included in the scope of protection.

For the sake of order, it should finally be pointed out that for a better understanding of the construction of the multi-speed transmission this is shown schematically in the figures and in reality therefore more components than shown, fewer components than shown or may include other components. In general, the concrete constructive design lies within the scope of expert knowledge.

The task underlying the independent inventive solutions can be taken from the description.

First transmission gear set

second gear wheel set

third gear wheel set

fourth gear wheel set

Sun gear of the first gear wheel set

Bridge of the first gear wheel set

Ring gear of the first gear wheel set

Sun gear of the second gear wheel set

Bridge of the second gear wheel set

Ring gear of the second gear wheel set

Sun gear of the third gear wheel set

Bridge of the third gear wheel set

Ring gear of the third gear wheel set

Sun gear of the fourth gear wheel set

Bridge of the fourth gear wheel set

Ring gear of the fourth gear wheel set first brake

second brake

first clutch

second clutch

third clutch

fourth clutch

fifth clutch

sixth clutch

seventh clutch

drive

output

casing

, 76, 77, 78 wave

Claims

claims

1 . Multi-speed transmission,

comprising at least four planetary gear sets (1, 2, 3, 4), a housing (72), a drive shaft (70) and an output shaft (71)

a ring gear (13) of a first planetary gear set (1) is continuously connected to a sun gear (41) of a fourth planetary gear set (4),

a ring gear (43) of the fourth planetary gear set (4) is permanently connected to the output shaft (71),

a sun gear (1 1) of the first planetary gear set (1) and a web (22) of a second planetary gear set (2) can be coupled to the housing (72) via a first brake (51),

a web (12) of the first planetary gear set (1) can be coupled to the housing (72) via a second brake (52),

the web (32) with the sun gear (31), the ring gear (33) with the sun gear (31) or the ring gear (33) with the web (32) respectively of the third planetary gear set (3) or the drive shaft (70) with the Web (42) of the fourth planetary gear set (4) via a first coupling (61) can be coupled,

a ring gear (43) with the sun gear (41) or the ring gear (43) with the web (42) or the sun gear (41) with the web (42) respectively of the fourth planetary gear set (4) via a second clutch (62) coupled and three of the following five compounds are permanently and two of the said compounds by means of at least one switching element releasably executed:

Connection of the drive shaft (70) with a sun gear (21) of the second planetary gear set (2),

Connecting the drive shaft (70) with a sun gear (31) of a third planetary gear set (3),

Connecting a ring gear (33) of the third planetary gear set (3) with the web (22) of the second planetary gear set (2),

Connection of a web (32) of the third planetary gear set (3) with the web (42) of the fourth planetary gear set (4) and Connection of a ring gear (13) of the first planetary gear set (1) with a ring gear (23) of the second planetary gear set (2).

2. Multi-speed transmission according to claim 1, characterized in that, the drive shaft (70) with the sun gear (21) of the second planetary gear set

(2) via a third clutch (63) is coupled and

the ring gear (13) of the first planetary gear set (1) is permanently connected to the ring gear (23) of the second planetary gear set (2).

3. Multi-speed transmission according to claim 2, characterized in that, the drive shaft (70) with the sun gear (31) of the third planetary gear set

(3) via a fourth clutch (64) can be coupled,

the ring gear (33) of the third planetary gear set (3) is permanently connected to the web (22) of the second planetary gear set (2) and

the web (32) of the third planetary gear set (3) is permanently connected to the web (42) of the fourth planetary gear set (4).

4. Multi-step transmission according to claim 2, characterized in that, the drive shaft (70) with the sun gear (31) of the third planetary gear set

(3) is constantly connected,

the ring gear (33) of the third planetary gear set (3) can be coupled to the web (22) of the second planetary gear set (2) via a fifth clutch (65) and

5. Multi-step transmission according to claim 2, characterized in that, the drive shaft (70) with the sun gear (31) of the third planetary gear set

(3) is constantly connected,

the web (32) of the third planetary gear set (3) can be coupled to the web (42) of the fourth planetary gear set (4) via a sixth clutch (66).

6. Multi-step transmission according to claim 1, characterized in that, the drive shaft (70) with the sun gear (21) of the second planetary gear set

(2) is constantly connected and

the ring gear (13) of the first planetary gear set (1) can be coupled to the ring gear (23) of the second planetary gear set (2) via a seventh clutch (67).

7. Multi-step transmission according to claim 6, characterized in that, the drive shaft (70) with the sun gear (31) of the third planetary gear set

(3) via a fourth clutch (64) can be coupled,

8. Multi-step transmission according to claim 6, characterized in that, the drive shaft (70) with the sun gear (31) of the third planetary gear set

(3) is constantly connected,

9. Multi-step transmission according to claim 6, characterized in that, the drive shaft (70) with the sun gear (31) of the third planetary gear set

(3) is constantly connected,

the web (32) of the third planetary gear set (3) with the web (42) of the fourth planetary gear set (4) and the shaft 78 via a sixth clutch (66) can be coupled.

10. Multi-step transmission according to claim 3, 4, 5, 7, 8 or 9, characterized in that the following courses by closing the specified elements are switchable :,

a first gear through first brake (51), second clutch (62) and fourth clutch (64) / fifth clutch (65) / sixth clutch (66),

a second gear through first brake (51), second brake (52) and fourth clutch (64) / fifth clutch (65) / sixth clutch (66),

a third gear through first brake (51), third clutch (63) / seventh clutch (67) and fourth clutch (64) / fifth clutch (65) / sixth clutch (66),

a fourth gear through second brake (52), third clutch (63) / seventh clutch (67) and fourth clutch (64) / fifth clutch (65) / sixth clutch (66),

a fifth gear through first clutch (61), third clutch (63) / seventh clutch (67) and fourth clutch (64) / fifth clutch (65) / sixth clutch (66), or through first clutch (61), second clutch (62) and fourth clutch

(64) / fifth clutch (65) / sixth clutch (66),

a sixth gear through second brake (52), first clutch (61) and fourth clutch (64) / fifth clutch (65) / sixth clutch (66),

a seventh gear through second brake (52), first clutch (61) and third clutch (63) / seventh clutch (67),

an eighth gear through first brake (51), second brake (52) and first clutch (61),

a ninth gear through first brake (51), first clutch (61) and third clutch (63) / seventh clutch (67),

a reverse gear through first brake (51), second clutch (62) and third clutch (63) / seventh clutch (67),

an additional forward gear by second brake (52), second clutch (62) and third clutch (63) / seventh clutch (67) and

an additional reverse gear through second brake (52), second clutch (62) and fourth clutch (64) / fifth clutch (65) / sixth clutch (66),

wherein the respective elements not mentioned are unactuated or opened.

1 1. Multi-speed transmission according to claim 7, 8 or 9, characterized in that the following gears are switchable by closing the specified elements :, a first gear through first brake (51), second clutch (62) and fourth clutch (64) / fifth clutch (65) / sixth clutch (66),

a third gear through first brake (51), seventh clutch (67) and fourth clutch (64) / fifth clutch (65) / sixth clutch (66),

a fourth gear through second brake (52), seventh clutch (67) and fourth clutch (64) / fifth clutch (65) / sixth clutch (66),

a fifth gear through first clutch (61), seventh clutch (67) and fourth clutch (64) / fifth clutch (65) / sixth clutch (66), or

by first clutch (61), second clutch (62) and fourth clutch

(64) / fifth clutch (65) / sixth clutch (66),

a seventh gear by second brake (52), first clutch (61) and seventh clutch (67),

a ninth gear through first brake (51), first clutch (61) and seventh clutch (67),

a reverse gear through first brake (51), second clutch (62) and seventh clutch (67),

an additional forward gear by second brake (52), second clutch (62) and seventh clutch (67) and

wherein the respective elements not mentioned are unactuated or opened.

12. Multi-step transmission according to one of claims 1 to 1 1, characterized in that:

the first wheel set (1) as a plus wheel set,

the second wheel set (2) as a minus wheel set, the third wheel set (3) as a minus wheel set and,

the fourth set of wheels (4) are designed as a minus wheel set.

13. Multi-speed transmission according to claim 12, characterized in that the transmission ratio :,

of the first gear set (1) between sun gear (1 1) and ring gear (12) +1, 600 and / or

of the second set of wheels (2) between sun gear (21) and ring gear (22) -3,200 and / or

of the third wheel set (3) between sun gear (31) and ring gear (32) -3,700 and / or

of the fourth gear set (4) between sun gear (41) and ring gear (42) -1, 600 is.

14. Multi-speed transmission according to one of claims 1 to 13, characterized in that instead of a first mentioned connection / coupling to a web (12, 22, 32, 42) of a wheelset (1, 2, 3, 4) and a second said connection / Coupling to a ring gear (13, 23, 33, 43) of this wheel set (1, 2, 3, 4), the first-mentioned connection / coupling to said ring gear (13, 23, 33, 43) of this wheel set (1, 2, 3, 4) and the second said connection / coupling to said web (12, 22, 32, 42) of this wheel set (1, 2, 3, 4) is executed, said wheel set (1, 2, 3 , 4) instead of a minus wheel as a plus wheel or instead of a plus wheel as a negative wheel is executed.

15. Multi-speed transmission according to one of claims 1 to 14, characterized in that the second clutch (62) and the fourth clutch (64) / fifth clutch (65) / sixth clutch (66) are designed as jaw clutches.