Automatic transmission for motor vehicles

Automatic transmission for motor vehicles
RE39960

The invention concerns a transmission (1) with automatic shifting capabilities and with three spider supported planetary sets (2, 3, 4), three brakes (5, 6, 7), and two clutches (8, 9) for the shifting of six forward moving gears and one reverse gear and having an input shaft (10) and an output shaft (11). In this way, the input shaft (10) is in continual connection with the sun gear (16) of the second planetary set (3) and the input shaft (10) is connectable to the sun gear (12) of the first planetary set (2) by means of the first clutch (8) and/or by means of the second clutch (9) is also connectable with the spider (15) of the first planetary set (2). Further, the sun gear (12) of the first planetary set (2) by means of the first brake (5) and or the spider (15) of the first planetary set (2) by means of the second brake (6) and/or the sun gear (20) of the third planetary set (4) by means of the third brake, are all connectable with the housing of the transmission.

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Patent RE39960
Priority Mar 22 1999
Filed Mar 16 2000
Issued Dec 25 2007
Expiry Mar 16 2020
Inventors Gumpoltsbe…
Assg.orig ZF Friedri…
Assg.curr ZF Friedri…
Entity Large
Referenced by 0
References 69
Maint.: all paid

FIELD OF THE INVENTI…
BACKGROUND OF THE IN…

1. A transmission (1) for a motor vehicle having a capability of automatic shifting, the transmission (1) having three spider planetary sets (2, 3, 4) in which a first planetary set (2) is on an entry side of the transmission (1) , a third planetary set (4) is on an exit side of the transmission (1) and a second planetary set (3) is located between the first planetary set (2) and the third planetary set (4), the transmission (1) possessing first, second and third brakes (5, 6, 7) and first and second clutches (8, 9) for the shifting of six forward gears and one reverse gear, and having one input shaft (10) and one output shaft (11) with the following combinations:

the input shaft (10) is connected directly with a sun gear (16) of the second planetary set (3);

the input shaft (10) is connectable by the first clutch (8) with a sun gear (12) of the first planetary set (2) and connectable with a spider (15) of the first planetary set (2) by the second clutch (9);

the sun gear (12) of the first planetary set (2) is connectable with a housing of the transmission (1) by the first brake (5); and

the spider (15) of the first planetary set (2) is connectable with the housing of the transmission by the second brake (6);

wherein a sun gear (20) of the third planetary set (4) is freely rotatable with respect to the sun, the spider and the internal gears of the first and second planetary sets and is connectable solely with the transmission housing when the third brake (7) is engaged; and

the output shaft (11) is fixedly connected with a spider (19) of the second planetary set (3) and is fixedly connected with an internal gear (14) of the first planetary set (2) .

0. 28. A transmission (1) for a motor vehicle having a capability of automatic shifting, the transmission having first, second and third spider planetary sets (2, 3, 4) in which a second planetary set (3) is located between a first planetary set (2) and a third planetary set (4), the transmission (1) possessing first, second and third brakes (5, 6, 7) and first and second clutches (8, 9) for shifting of six forward gears and a reverse gear, and having an input shaft (10) and an output shaft (11) with the following combinations:

the input shaft (10) is connected directly with a sun gear (16) of the second planetary set (3);

the input shaft (10) is connectable by the first clutch (8) with a sun gear (12) of the first planetary set (2) and connectable with a spider (15) of the first planetary set (2) by the second clutch (9);

the sun gear (12) of the first planetary set (2) is connectable with a housing of the transmission (1) by the first brake (5);

the spider (15) of the first planetary set (2) is connectable with the housing of the transmission (1) by the second brake (6);

wherein a sun gear (20) of the third planetary set (4) is connectable with the housing of the transmission (1) by the third brake (7);

the output shaft (11) is fixedly connected with a spider (23) of the third planetary set (4) and with an internal gear (14) of the first planetary set (2);

the spider (15) of the first planetary set (2) is fixedly connected to an internal gear (18) of the second planetary set (3); and

a spider (19) of the second planetary set (3) is fixedly connected to an internal gear (22) of the third planetary set (4).

8. A transmission (1) for a motor vehicle having a capability of automatic shifting, the transmission (1) having three spider planetary sets (2, 3, 4) in which a first planetary set (2) is on an entry side of the transmission (1) , a third planetary set (4) is on an exit side of the transmission (1) , and a second planetary set (3) is located between the first planetary set (2) and the third planetary set (4), the transmission (1) possessing first, second and third brakes (5, 6, 7) and first and second clutches (8, 9) for the shifting of six forward gears and one reverse gear, and having one input shaft (10) and one output shaft (11) with the following combinations:

the input shaft (10) is connected directly with a sun gear (16) of the second planetary set (3);

the sun gear (12) of the first planetary set (2) is connectable with a housing of the transmission (1) by the first brake (5);

the spider (15) of the first planetary set (2) is connectable with the housing of the transmission by the second brake (6);

wherein a sun gear (20) of the third planetary set (4) is connectable with the transmission housing by the third brake (7);

the output shaft (11) is fixedly connected with a spider (19) of the second planetary set (3) and is fixedly connected with an internal gear (14) of the first planetary set (2), and

the spider (15) of the first planetary set (2) is fixedly connected with an internal gear (22) of the third planetary set (4) and an internal gear (18) of the second planetary set (3) is fixedly connected to a spider (23) of the third planetary set (4).

2. The motor vehicle transmission with automatic shifting capability according to claim 1, wherein the spider (15) of the first planetary set (2) is continually connected with the internal gear (22) of the third planetary set (4) and the internal gear (18) of the second planetary set (3) is continually connected to the spider (23) of the third planetary set (4).

3. The motor vehicle transmission with automatic shifting capability according to claim 1 wherein the first clutch (8) is activated in a third gear and in a fifth gear, as well as in a reverse gear.

4. The motor vehicle transmission with automatic shifting capability according to claim 1, wherein the second clutch (9) is activated in a fourth gear, in a fifth gear and in a sixth gear.

5. The motor vehicle transmission with automatic shifting capability according to claim 1, wherein the first break brake (5) is activated in a second gear and in a sixth gear.

6. The motor vehicle transmission with automatic shifting capability according to claim 1, wherein the second third brake (6) (7) is activated in a first gear, in a second gear, in a third gear and in a fourth gear.

7. The motor vehicle transmission with automatic shifting capability according to claim 1, wherein the second brake (6) is activated in a first gear and in a reverse gear.

9. The motor vehicle transmission with automatic shifting capability according to claim 8, wherein the first clutch (8) is activated in a third gear and in a fifth gear, as well as in a reverse gear.

10. The motor vehicle transmission with automatic shifting capability according to claim 8, wherein the second clutch (9) is activated in a fourth gear, in a fifth gear and in a sixth gear.

11. The motor vehicle transmission with automatic shifting capability according to claim 8, wherein the first break brake (5) is activated in a second gear and in a sixth gear.

12. The motor vehicle transmission with automatic shifting capability according to claim 8, wherein the second third brake (6) (7) is activated in a first gear, in a second gear, in a third gear and in a fourth gear.

13. The motor vehicle transmission with automatic shifting capability according to claim 8, wherein the second brake (6) is activated in a first gear and in a reverse gear.

0. 14. A transmission (1) for a motor vehicle having a capability of automatic shifting, the transmission having three spider planetary sets (2, 3, 4) in which a first planetary set (2) is on an entry side of the transmission (1), a third planetary set (4) is on an exit side of the transmission (1) and a second planetary set (3) is located between the first planetary set (2) and the third planetary set (4), the transmission (1) possessing first, second and third brakes (5, 6, 7) and first and second clutches (8, 9) for the shifting of six forward gears and one reverse gear, and having one input shaft (10) and one output shaft (11) with the following combinations:

the input shaft (10) is connected directly with a sun gear (16) of the second planetary set (3);

the sun gear (12) of the first planetary set (2) is connectable with a housing of the transmission (1) by the first brake (5);

the spider (15) of the first planetary set (2) is connectable with the housing of the transmission by the second brake (6);

wherein a sun gear (20) of the third planetary set (4) is connectable with the transmission housing by the third brake (7);

the output shaft (11) is fixedly connected with a spider (19) of the second planetary set (3) and is fixedly connected with an internal gear (14) of the first planetary set (2), and

a first clutch (8) is activated in a third gear, in a fifth gear and in a reverse gear.

0. 15. The motor vehicle transmission with automatic shifting capability according to claim 14, wherein the second clutch (9) is activated in a fourth gear, in a fifth gear and in a sixth gear.

0. 16. The motor vehicle transmission with automatic shifting capability according to claim 14, wherein the first break (5) is activated in a second gear and in a sixth gear.

0. 17. The motor vehicle transmission with automatic shifting capability according to claim 14, wherein the second brake (6) is activated in a first gear, in a second gear, in a third gear and in a fourth gear.

0. 18. The motor vehicle transmission with automatic shifting capability according to claim 14, wherein the second brake (6) is activated in a first gear and in a reverse gear.

0. 19. A transmission (1) for a motor vehicle having a capability of automatic shifting, the transmission having three spider planetary sets (2, 3, 4) in which a first planetary set (2) is on an entry side of the transmission (1), a third planetary set (4) is on an exit side of the transmission (1) and a second planetary set (3) is located between the first planetary set (2) and the third planetary set (4), the transmission (1) possessing first, second and third brakes (5, 6, 7) and first and second clutches (8, 9) for the shifting of six forward gears and one reverse gear, and having one input shaft (10) and one output shaft (11) with the following combinations:

the input shaft (10) is connected directly with a sun gear (16) of the second planetary set (3);

the sun gear (12) of the first planetary set (2) is connectable with a housing of the transmission (1) by the first brake (5);

the spider (15) of the first planetary set (2) is connectable with the housing of the transmission by the second brake (6);

wherein a sun gear (20) of the third planetary set (4) is connectable with the transmission housing by the third brake (7);

the output shaft (11) is fixedly connected with a spider (19) of the second planetary set (3) and is fixedly connected with an internal gear (14) of the first planetary set (2), and

the second clutch (9) is activated in a fourth gear, in a fifth gear and in a sixth gear.

0. 20. A transmission (1) for a motor vehicle having a capability of automatic shifting, the spider having three spider planetary sets (2, 3, 4) in which a first planetary set (2) is on an entry side of the transmission (1), a third planetary set (4) is on an exit side of the transmission (1) and a second planetary set (3) is located between the first planetary set (2) and the third planetary set (4), the transmission (1) possessing first, second and third brakes (5, 6, 7) and first and second clutches (8, 9) for the shifting of six forward gears and one reverse gear, and having one input shaft (10) and one output shaft (11) with the following combinations:

the input shaft (10) is connected directly with a sun gear (16) of the second planetary set (3);

the sun gear (12) of the first planetary set (2) is connectable with a housing of the transmission (1) by the first brake (5);

the spider (15) of the first planetary set (2) is connectable with the housing of the transmission by the second brake (6);

wherein the sun gear (20) of the third planetary set (4) is connectable with the transmission housing by the third brake (7);

the output shaft (11) is fixedly connected with a spider (19) of the second planetary set (3) and is fixedly connected with an internal gear (14) of the first planetary set (2), and

the first brake (5) is activated in a second gear and in a sixth gear.

0. 21. A transmission (1) for a motor vehicle having a capability of automatic shifting, the transmission having three spider planetary sets (2, 3, 4) in which a first planetary set (2) is on an entry side of the transmission (1), a third planetary set (4) is on an exit side of the transmission (1) and a second planetary set (3) is located between the first planetary set (2) and the third planetary set (4), the transmission (1) possessing first, second and third brakes (5, 6, 7) and first and second clutches (8, 9) for the shifting of six forward gears and one reverse gear, and having one input shaft (10) and one output shaft (11) with the following combinations:

the input shaft (10) is connected directly with a sun gear (16) of the second planetary set (3);

the sun gear (12) of the first planetary set (2) is connectable with a housing of the transmission (1) by the first brake (5);

the spider (15) of the first planetary set (2) is connectable with the housing of the transmission by the second brake (6);

wherein a sun gear (20) of the third planetary set (4) is connectable with the transmission housing by the third brake (7);

the output shaft (11) is fixedly connected with a spider (19) of the second planetary set (3) and is fixedly connected with an internal gear (14) of the first planetary set (2), and

the third brake (7) is activated in a first gear, in a second gear, in a third gear and in a fourth gear.

0. 22. The motor vehicle transmission with automatic shifting capability according to claim 1, wherein the input shaft (10) and the output shaft (11) are both located on the same side of the transmission.

0. 23. The motor vehicle transmission with automatic shifting capability according to claim 1, wherein the input shaft (10) supplies drive input:

to the sun gear (16) of the second planetary set (3);

to the sun gear (12) of the first planetary set (2) via the first clutch (8); and

to the spider (15) of the first planetary set (2) which is connected to the internal gear (18) of the second planetary set (3) via the second clutch (9); and

an output of the output shaft (11) is located between the first, second and third planetary sets (2, 3 and 4) and the first and second clutches (8 and 9).

0. 24. The motor vehicle transmission with automatic shifting capability according to claim 1, wherein the input shaft (10) includes a torque converter (24) and a turbine wheel of the torque converter (24) is connected directly with the sun gear (16) of the second planetary set (3).

0. 25. The motor vehicle transmission with automatic shifting capability according to claim 1, wherein a vibration damper (26) is located between the input shaft (10) an internal combustion engine (25).

0. 26. The motor vehicle transmission with automatic shifting capability according to claim 1, wherein the input shaft (10) and the output shaft (11) are both located on the same side of the transmission; and

a vibration damper (26) is located between the input shaft (10) an internal combustion engine (25).

0. 27. The motor vehicle transmission with automatic shifting capability according to claim 1, wherein drive is supplied by the output shaft (11) to the drive wheels (28 and 29) by an additional gear ratio stage and a differential (27).

0. 29. The motor vehicle transmission with automatic shifting capability according to claim 28, wherein the first clutch (8) is activated in a third gear and in a fifth gear, as well as in a reverse gear.

0. 30. The motor vehicle transmission with automatic shifting capability according to claim 28, wherein the second clutch (9) is activated in a fourth gear, in a fifth gear and in a sixth gear.

0. 31. The motor vehicle transmission with automatic shifting capability according to claim 28, wherein the first brake (5) is activated in a second gear and in a sixth gear.

0. 32. The motor vehicle transmission with automatic shifting capability according to claim 28, wherein the third brake (7) is activated in a first gear, in a second gear, in a third gear and in a fourth gear.

0. 33. The motor vehicle transmission with automatic shifting capability according to claim 28, wherein the second brake (6) is activated in a first gear and in a reverse gear.

FIELD OF THE INVENTION

The present invention concerns a motor vehicle transmission capable of automatic shifting, with three spider mounted, planetary sets, three braking mechanisms, two couplings for six forward gear changes and one reverse gear change as well as one input drive shaft and one output drive shaft.

BACKGROUND OF THE INVENTION

A planetary transmission of this nature has been made known by U.S. Pat. No. 4,070,927, wherein the number of the forward gears is respectively greater by one than the numbers of the frictional elements. At each gear change between the forward gears, one of the provided frictional elements is shifted in or out.

Thus, the purpose of the invention is to make available a new and improved transmission, which avoids the known faults and yet fulfills the above mentioned advantages. Further the purpose will include a desirable construction and arrangement of a start-up element as well as make possible a desirable design of the input and output of power.

In accord with the invention, this purpose will be achieved by a transmission for a motor vehicle with automatic shifting capabilities of the type mentioned in the introductory passages for For a transmission in accord with FIG. 2, the two examples of gear ratio series (FIGS. 10, 11), exhibit a ratio i in the first gear between 3.83 or 3.87 at an entire stage range φ_gesof 0.48 4.88 to 5.06. The ratio i in the fifth gear shows likewise 1.00. The fifth gear is, in all ratio series, is designed advantageously as a direct gear.

From the flow diagram of shifting in accord with the presentation of FIG. 12, it may be seen that in the case of sequential shifting, double shifting is avoided, since two neighboring gear stages always employ one switching element in common. From this flow diagram in FIG. 12, one can also see, that in the case of any optional shifting between the first and fourth gears, as well as between the fourth and sixth gears, at any time, only switching element is activated. The shift position of a braked neutral is possible through the activation of the brakes B1 and B2, whereby a blockage of the output drive is made and a simultaneous, defined speed of rotation can be achieved in the transmission, possibly useful for a hill-holding function.

At the same time, free wheeling at each position of the transmission can be brought about, thus, for instance, between the shaft and the housing, or between two shafts, in order to divide one shaft into two. A neutral position can be effected by the closure of one shifting element and the opening of another, for instance, by closing the first brake 5, B1 and opening the second brake 6, B2 for a neutral position forwards.

Further, the input drive shaft 10 can be separated from the motor by a clutch element, whereby the clutch element, for instance, can be designed as a dry or wet start-up clutch, a magnetic powder clutch, a centrifugal, a hydrodynamic clutch or a similar clutch device. Further, the input drive shaft 10 can also be separated from the motor by means of a conversion element, wherein this may be designed as a hydrodynamic converter, as a differential converter, as a start-up retarder, as a hydrostatic transmission, or an electrical transmission or again as an electrodynamic clutch.

Further, the input drive shaft 10 can also be separated from the motor by a conversion element, wherein this could be designed as a hydrodynamic converter, as a differential converter, as a start-up retarder, as a hydrostatic transmission, as an electrical transmission or as an electro-mechanical transmission or the like. This means, that between the motor and the drive, an additional ratio stage with a constant or even a variable ratio which was equal to or greater than one.

Alternatively, a start-up element can also be placed behind the drive, so that the input shaft 10 is firmly bond with the clutch shaft of a motor. In such a case, the start-up is carried out by a shifting element of the transmission, for instance, by means of the second brake 6.

In addition a slip-free brake, for instance a hydraulic or electrical retarder or the like, can be placed on each shaft, preferably on the input shaft 10 or the output shaft 11.

Also a power takeoff shaft can be provided for the input power from additional components on each shaft, preferably, however, on the input shaft 10 and the output shaft 11.

The shifting elements themselves comprise powershift clutches or brakes, such as lamellar clutches, band brakes, conic clutches or the like.

The shifting elements can, however, be made of form-fit clutches or brakes, for instance dog clutches or synchronization.

INVENTORS:

Gumpoltsberger, Gerhard, Kuhn, Walter, Domian, Hans-Jorg, Korkmaz, Bülent, Drerup, Bernhard

THIS PATENT IS REFERENCED BY THESE PATENTS:

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Executed on	Assignor	Assignee	Conveyance	Frame	Reel	Doc
Mar 16 2000		ZF Friedrichshafen AG	(assignment on the face of the patent)

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