Transmission Arrangement and Motor Vehicle

Abstract

A transmission arrangement for a motor vehicle includes a first planetary gear set and a second planetary gear set. A first dog element is axially between the second and third dog elements and is rotationally fixed to the first ring gear. A first shift element shiftable to rotationally fix the first dog element to one or both of the first sun gear and the first planet gear carrier and a second shift element shiftable to rotationally fix the first shift element to one of the rotary elements of the second planetary gear set. A second dog element is rotationally fixed to the second sun gear and is rotationally fixable by the first shift element to one or both of the first sun gear and the first planet gear carrier. A third dog element is rotationally fixed to the second sun gear and connectable to the first ring gear by the second shift element.

Claims

1-15. (canceled)

16. A transmission arrangement (10) for a motor vehicle, comprising: a first planetary gear set (14) having rotary elements including a first ring gear (18), a first sun gear (22), and a first planet gear carrier (20); a second planetary gear set (16) having rotary elements including a second ring gear (24), a second sun gear (28), and a second planet gear carrier (26); a first dog element (36) rotationally fixed to the first ring gear (18); a first shift element (32) shiftable to rotationally fix the first dog element (36) to one or both of the first sun gear (22) and the first planet gear carrier (20); a second shift element (50) shiftable to rotationally fix the first shift element (32) to one of the rotary elements of the second planetary gear set (16); a second dog element (42) rotationally fixed to the second sun gear (28) and rotationally fixable by the first shift element (32) to one or both of the first sun gear (22) and the first planet gear carrier (20); and a third dog element (60) rotationally fixed to the second sun gear (28) and connectable to the first ring gear (18) by the second shift element (50), wherein the first dog element (36) is axially between the second dog element (42) and the third dog element (60).

17. The transmission arrangement (10) of claim 16, wherein the first dog element (36) and the second dog element (42) are alternately connectable to the first planet gear carrier (20) by the first shift element (32).

18. The transmission arrangement (10) of claim 16, wherein the third dog element (60) and the second planet gear carrier (26) are alternately connectable to the first dog element (36) by the second shift element (50).

19. The transmission arrangement (10) of claim 16, wherein the second shift element (50) is axially movably mounted at recesses of particular finger elements (52) of the first dog element (36).

20. The transmission arrangement (10) of claim 16, wherein the first shift element (32) is arranged within a cavity (46) defined by the first ring gear (18).

21. The transmission arrangement (10) of claim 16, wherein the second dog element (42) is arranged at least partially within a cavity (46) defined by the first ring gear (18).

22. The transmission arrangement (10) of claim 16, wherein the third dog element (60) is arranged outside a cavity (46) defined by the first ring gear (18).

23. The transmission arrangement (10) of claim 16, wherein one or both of the second dog element (42) and the third dog element (60) is axially movably mounted on a shaft of the second sun gear (28).

24. The transmission arrangement (10) of claim 16, wherein the first dog element (36) is axially movably connected to the first ring gear (18), wherein the first dog element (36) has a collar (64) against which the first ring gear (18) at least selectively abuts.

25. The transmission arrangement (10) of claim 16, wherein the first and second planetary gear sets (14, 16) are coaxial, and wherein the first and second planetary gear sets (14, 16) are one or both of directly adjacent and at least partially radially nested.

26. The transmission arrangement (10) of claim 16, wherein the first dog element (36) is an annular body.

27. The transmission arrangement (10) of claim 26, wherein an inner passage opening of the first dog element (36) has a larger diameter than at least part of one or more of the second dog element (42), the third dog element (60), the second sun gear (28), and a shaft of the second sun gear (28).

28. The transmission arrangement (10) of claim 27, wherein the first dog element (36) at least partially radially overlaps with one or more of the second dog element (42), the third dog element (60), the second sun gear (28), and the shaft of the second sun gear (28).

29. The transmission arrangement (10) of claim 26, wherein the annular body has a radially inwardly projecting ridge (66) extending at least partially circumferentially, the ridge (66) at least partially axially overlapping with the second dog element (42) and the third dog element (60), the ridge (66) mounting the first dog element (36) at the second dog element (42) and the third dog element (60).

30. A motor vehicle, comprising the transmission arrangement (10) of claim 16.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0031] The FIGURE illustrates a partial, schematic sectional view of a transmission arrangement for a motor vehicle.

DETAILED DESCRIPTION

[0032] Reference will now be made to embodiments of the invention, one or more examples of which are shown in the drawings. Each embodiment is provided by way of explanation of the invention, and not as a limitation of the invention. For example, features illustrated or described as part of one embodiment can be combined with another embodiment to yield still another embodiment. It is intended that the present invention include these and other modifications and variations to the embodiments described herein.

[0033] The FIGURE shows a partial, schematic section view of a transmission arrangement 10 of a motor vehicle. The transmission arrangement 10 has a central axis 12, to which all essential elements of the transmission arrangement 10 are coaxial and about which all essential elements of the transmission arrangement 10 are rotationally symmetrical. The central axis 12 defines an axial direction, with respect to which a radial direction is orthogonal.

[0034] The transmission arrangement 10 includes a first planetary gear set 14 arranged on the left in the FIGURE and a second planetary gear set 16 arranged on the right in the FIGURE. The two planetary gear sets 14, 16 are therefore arranged essentially axially adjacent, next to one another. Via the second planetary gear set 16, drive forces of an electric machine (not shown) connected thereto are guided into a drive train of the motor vehicle. Via the first planetary gear set 14, by comparison, drive forces of an internal combustion engine (not shown) connected thereto are introduced into the drive train. The internal combustion engine and the electric machine are arranged axially to the left and the right of the transmission arrangement 10, respectively, whereby a particular suitability for a front-mounted transverse installation is given.

[0035] The first planetary gear set 14 includes a first ring gear carrier 18, which is also referred to simply as a first ring gear 18, a first planet carrier 20, and a first sun gear 22, which are considered to be rotary elements of the first planetary gear set 14. The second planetary gear set 16 includes, correspondingly, a second ring gear 24, a second planet gear carrier 26, and a second sun gear 28, which are considered to be rotary elements of the second planetary gear set 16. The particular rotary elements of each planetary gear set 14, 16 are rotationally fixed differently to one another and to particular rotary elements of the other planetary gear set in order to provide different gear stages and gears for the electric machine and the internal combustion engine separately in order to introduce their drive forces at particular driven wheels.

[0036] In the FIGURE, a planet gear 30 is shown, which is rotatably mounted at the second planet gear carrier 26. Each planet gear carrier 20, 26 includes multiple planet gears distributed over the circumference. Each rotary element includes one or multiple dog element(s) and/or shaft(s) permanently rotationally fixed thereto. These dog elements and/or shafts are therefore also considered to be part of these rotary elements.

[0037] In the present case, the electric machine is connected, with its rotor, to the second sun gear 28. The internal combustion engine is connected, with its output shaft, to the first sun gear 22. The first ring gear 18 functions, in the transmission arrangement, as a common output shaft for transmitting the drive force and a driving torque.

[0038] The transmission arrangement 10 includes at least a first shift element 32, which is permanently rotationally fixed to the first planet gear carrier 20 at the dog toothing 34. In addition, a first dog element 36, which has a radially upward pointing dog toothing 38 on the left side, is permanently rotationally fixed to the first ring gear 18. By axially moving or displacing the first shift element 32 to the right, the first shift element 32 is rotationally fixed to the first dog element 36 with a corresponding toothing, whereby a rotationally fixed connection between the first ring gear 18 and the first planet carrier 20 and, thereby, an appropriate ratio and an appropriate gear is selected. The shift element 32 is also moved axially to the left, whereby an engagement at a dog toothing 40 of a second dog element 42 is established. The second dog element 42 is rotationally fixed via a driving toothing 44 to the second sun gear 28, although it is attached in an axially easily moveable manner in order to avoid an overdetermination of particular mountings of the transmission arrangement 10 and/or its components by redundant features. Therefore, the first planet gear carrier 20 is rotationally fixable to the second sun gear 28. In addition, when the first shift element 32 is moved into the position shown in the FIGURE, it does not couple the first planet gear carrier 20 to a further rotary element and which is also referred to as free-wheeling.

[0039] The first shift element 32 therefore already enables three shift conditions, as the result of which the transmission is compact despite having a high number of different gears. The first shift element 32 is completely accommodated in a cavity 46 formed by the first ring gear 18 and its first dog element 36, as the result of which the transmission arrangement 10 is particularly compact and nested. The first shift element 32 is moved from the outside by a shift rail 48, which is also axially guided through the cavity 46. As a result, an outer accessibility in combination with a compact design is ensured.

[0040] In addition, the transmission arrangement 10 includes a second shift element 50, which is, in the present case, a slidable sleeve. The second shift element 50 is axially guided with particular recesses at finger elements 52, wherein the finger elements 52 are formed at an end surface of the first dog element 36. As a result, the second shift element 50 remains accessible radially from the outside for displacement and/or movement, without a separate mounting being necessary. This also enables the transmission arrangement to be particularly compact. The second shift element 50 has, for example, in the present case, a groove 54 that is circumferential on the outer side, into which a selector fork or a shift rail engages radially from the outside.

[0041] In the FIGURE, a position of the second shift element 50 is shown, in which the second shift element 50 is not in engagement with a further rotary element. A free-wheeling position is therefore shown. If the second shift element 50 according to the FIGURE is displaced axially toward the right, an outer dog toothing 56 comes into engagement with a corresponding toothing of the second planet gear carrier 26. As a result, the first ring gear 18 is rotationally fixable to the second planet carrier 26. If the second shift element 50 is moved axially toward the left, an inner dog toothing 58 comes into engagement with a corresponding toothing of a third dog element 60. The third dog element 60—similarly to the second dog element 42—is connected to the second sun gear 28 by a driving toothing 62 in a permanently rotationally fixed but axially easily displaceable manner. Correspondingly, in a shift position of this type, the ring gear 18 is rotationally fixed to the second sun gear 28 by the second shift element 50. The second shift element 50 therefore also enables three shift conditions, wherein the second shift element 50 is easily accessible from the outside for displacement. This also enables the transmission to be compact and simple despite having a high number of different gears.

[0042] In the present case, the first dog element 36 is axially supported only on one side, on the left, against the first ring gear 18 by a collar 64. As a result, an overdetermined mounting is avoided. Alternatively, the first dog element 36 is connected to the first ring gear 18 not only in a rotationally fixed manner but also in an axially fixed manner.

[0043] The first dog element 36 also includes a radially inwardly projecting, circumferential ridge 66. This ridge 66 projects radially inward up to mutually facing end surfaces of the second dog element 42 and of the third dog element 60. By this ridge 66, the first dog element 36 is mounted axially between the second dog element 42 and the third dog element 60. In the present case, an axial needle bearing 68 is provided at each end surface for this purpose.

[0044] In this way, the first dog element 36 and, thereby, also at least one side of the first ring gear 18 are integrated into an axial mounting and an axial power flow of the transmission arrangement 10. In particular, these are then axially supported at the second sun gear 28. The second sun gear 28 is axially mounted at a housing wall, if necessary indirectly via the second planet gear carrier 26 and/or the second ring gear 24. An axial load from both planetary gear sets 14, 16 is also easily compensated for with respect to one another in this way, and so the transmission arrangement 10 remains largely free from axial loads toward the outside.

[0045] In the present case, the first dog element 36 is also utilized for limiting the cavity 46 of the ring gear 18. In addition, the first dog element 36 at least partially occupies the same axial installation space as the second dog element 42 and the third dog element 60, which is achieved due to the thin radial ridge 66. This enables a radial offset of the remainder of the first dog element 36 in combination with an axial mounting. As a result, in addition, an arrangement is achieved for the second shift element 50, in which the second shift element 50 is accessible radially from the outside in order to be moved. Overall, in this way, an extreme nesting and, thereby, in particular, an axially compact design is achieved, in which the two shift elements 32, 50 are nevertheless moved with little complexity using mechanical means, such as shift rails or selector forks.

[0046] Modifications and variations can be made to the embodiments illustrated or described herein without departing from the scope and spirit of the invention as set forth in the appended claims. In the claims, reference characters corresponding to elements recited in the detailed description and the drawings may be recited. Such reference characters are enclosed within parentheses and are provided as an aid for reference to example embodiments described in the detailed description and the drawings. Such reference characters are provided for convenience only and have no effect on the scope of the claims. In particular, such reference characters are not intended to limit the claims to the particular example embodiments described in the detailed description and the drawings.

REFERENCE CHARACTERS

[0047] 10 transmission arrangement

[0048] 12 central axis

[0049] 14 first planetary gear set

[0050] 16 second planetary gear set

[0051] 18 first ring gear

[0052] 20 first planet gear carrier

[0053] 22 first sun gear

[0054] 24 second ring gear

[0055] 26 second planet gear carrier

[0056] 28 second sun gear

[0057] 30 planet gear

[0058] 32 first shift element

[0059] 34 dog toothing

[0060] 36 first dog element

[0061] 38 dog toothing

[0062] 40 dog toothing

[0063] 42 second dog element

[0064] 44 driving toothing

[0065] 46 cavity

[0066] 48 shift rail

[0067] 50 second shift element

[0068] 52 finger elements

[0069] 54 groove

[0070] 56 dog toothing

[0071] 58 dog toothing

[0072] 60 third dog element

[0073] 62 driving toothing

[0074] 64 collar

[0075] 66 ridge

[0076] 68 axial needle bearing