Transmission for a Motor Vehicle, and Composite Consisting of Such a Transmission and a Powertrain Side Shaft

Abstract

A transmission (G) for a motor vehicle includes an input shaft (GW1), an output shaft (GW2), a differential gear (AG), an interface (IF) to a transmission-external drive unit, an electric machine (EM) with a rotationally fixed stator (S) and a rotary rotor (R), a plurality of planetary gear sets (PS, PV), and a plurality of shift elements (A, B, C, D, E). The electric machine (EM) is arranged at an axial end of the transmission (G) which is positioned opposite the interface (IF) to the transmission-external drive unit. An area (X) directly adjacent to the differential gear (AG) is configured for accommodating a joint (GL) of a motor vehicle side shaft (DS) and is arranged completely or at least in part in an installation space radially outside the electric machine (EM).

Claims

1-6: (canceled)

7. A transmission (G) for a motor vehicle, comprising: an input shaft (GW1); an output shaft (GW2); a differential gear (AG); an interface (IF) to a transmission-external drive unit; an electric machine (EM) with a rotationally fixed stator (S) and a rotary rotor (R); a plurality of planetary gear sets (PS, PV); and a plurality of shift elements (A, B, C, D, E), wherein, via the planetary gear sets (PS, PV), various gears ratios between the input shaft (GW1) and the output shaft (GW2) are implementable by selectively engaging the shift elements (A, B, C, D, E), wherein the output shaft (GW2) is permanently operatively connected to at least one element of one of the planetary gear sets (PS, PV), the output shaft (GW2) comprises a tooth system at an interface (GW2-A) that intermeshes with a tooth system of a shaft (GW22), and the shaft (GW22) is axially parallel to the output shaft (GW2), wherein the shaft (GW 22) is permanently operatively connected to an element of the differential gear (AG), the rotor (R) is connected to an element of the planetary gear sets (PS, PV) or to the input shaft (GW1) such that the electric machine (EM) is configured for outputting power to the output shaft (GW2) in one or more of the various gear ratios, wherein the electric machine (EM) is arranged at an axial end of the transmission (G) which is positioned opposite the interface (IF) to the transmission-external drive unit, wherein the interface (GW2-A) of the output shaft (GW2) is arranged axially between the interface (IF) to the transmission-external drive unit and the electric machine (EM), and wherein an area (X) directly adjacent the differential gear (AG) is configured for accommodating a side shaft joint (GL), and the area (X) is arranged completely or at least in part in an installation space radially outside the electric machine (EM).

8. The transmission (G) of claim 7, wherein the area (X) for accommodating the side shaft joint (GL) directly abuts an outer wall of a transmission housing section (GG1) while forming an air gap between the side shaft joint (GL) and the outer wall of the transmission housing section (GG1), and the electric machine (EM) is arranged inside of the outer wall of the transmission housing section (GG1).

9. The transmission (G) of claim 7, wherein the planetary gear sets (PS, PV) are arranged axially between the interface (GW2-A) of the output shaft (GW) and the axial end of the transmission (G) at which the electric machine (EM) is arranged.

10. The transmission (G) of claim 9, wherein at least one of the shift elements (A, B, C, D, E) is a friction-locking brake, the friction-locking brake is arranged axially between the interface (GW2-A) of the output shaft (GW) and the electric machine (EM), and the friction-locking brake is arranged radially outside the planetary gear sets (PS, PV).

11. An assembly comprising the transmission (G) of claim 7 and a side shaft (DS) connected to the differential gear (AG) of the transmission (G), the differential gear (AG) configured for transmitting torque between an element of the differential gear (AG) and a driving wheel of a motor vehicle through the side shaft (DS), wherein the side shaft joint (GL) of the side shaft (DS) is arranged completely or at least in part radially outside the electric machine (EM) of the transmission (G).

12. The assembly of claim 11, wherein the side shaft joint (GL) of the side shaft (DS) directly abuts the outer wall of a transmission housing section (GG1) while forming an air gap between the side shaft joint (GL) and the outer wall of the transmission housing section (GG1), and the electric machine (EM) of the transmission (G) is arranged inside of the outer wall of the transmission housing section (GG1).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] One exemplary embodiment of the invention is described in detail in the following with reference to the attached figures. Wherein:

[0020] FIG. 1 and FIG. 2 show schematic sections of a transmission according to the exemplary embodiment of the invention; and

[0021] FIG. 3 shows a cutaway view of one structural exemplary embodiment of the transmission.

DETAILED DESCRIPTION

[0022] 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.

[0023] FIG. 1 shows a schematic view of a transmission G according to one exemplary embodiment of the invention. The representation selected in FIG. 1 is to be considered merely as a schematic, and acts as an overview of the basic design of the transmission G. The transmission G includes an input shaft GW1, an output shaft GW2, and planetary gear sets PS, PV, each of which includes two radially nested single planetary gear sets. Furthermore, the transmission G includes a first shift element C, a second shift element A, a third shift element B, a fourth shift element E, and a fifth shift element D. Via the planetary gear set PS and the further planetary gear set PV, various transmission ratios between the input shaft GW1 and the output shaft GW2 can be implemented by selectively engaging the shift elements A, B, C, D, E. The shift element marked as C operates as a brake, and is designed as a friction-locking shift element. By engaging the shift element C, a rotationally fixed connection is established between a sun gear of the planetary gear set PS and a transmission housing GG. The shift element C is arranged radially outside the planetary gear set PS in this case.

[0024] The transmission G further includes an electric machine EM which includes a rotationally fixed stator S and a rotary rotor R. The rotor R is permanently connected to a sun gear of the planetary gear set PV. The electric machine EM is designed as a so-called external rotor, whereby the rotor R is arranged radially outside the stator S. The electric machine EM is arranged at that axial end of the transmission G which is positioned opposite an interface IF to a transmission-external drive unit.

[0025] The transmission G further includes a connecting shaft AN, a torsional vibration damper TS, and a separating clutch K0. The connecting shaft AN acts as a torque-transmitting connection to the transmission-external drive unit in the area of the interface IF. The connecting shaft AN can be connected to the input shaft GW1 by engaging the separating clutch K0. The connecting shaft AN includes two sections in this case, wherein a first section is associated with the interface IF and a second section is associated with the separating clutch K0. The two sections are connected to each other by the torsional vibration damper TS.

[0026] The transmission G is designed, in particular, for use in a motor vehicle, the drive train of which is aligned transversely to the direction of travel of the motor vehicle. For this purpose, the output shaft GW2 includes a tooth system at an interface GW2-A. This tooth system intermeshes with a tooth system of a shaft GW22 aligned axially parallel to the output shaft GW2. Formed on the axially parallel shaft GW22 is yet another tooth system which intermeshes with a tooth system which is formed on a differential gear AG. By way of the differential gear AG, the power present at the output shaft GW2 can be distributed via side shafts DS to wheels (not represented) of the motor vehicle. Every side shaft DS includes two joints GL, wherein the joints GL associated with the differential gear AG are schematically represented in FIG. 1. One of the joints GL is arranged in an area X which abuts the differential gear AG and is arranged radially outside the electric machine EM. The transmission G and the side shaft DS, the joint GL of which is arranged in the area X, form an assembly according to example aspects of the invention.

[0027] FIG. 2 shows a schematic cutaway view of the transmission G, wherein the selected cutting plane is normal to the input shaft axis. Therein, it is apparent that the side shaft joint GL is arranged centrally with respect to the differential gear AG, wherein only a small air gap is formed between the outer diameter of the side shaft joint GL and a section GG1 of the transmission housing GG. The electric machine EM is arranged on the inside of this transmission housing section GG1.

[0028] FIG. 3 shows a cutaway view of a structural embodiment of the transmission G. For the sake of greater clarity, parts of the transmission G are hidden in FIG. 3, for example, the power path between the output shaft GW2 and the differential gear AG, and the upper section half of the planetary gear sets PS, PV and of the shift elements A, B, C. The cutting plane was selected in such a way that the arrangement of the side shaft joint GL close to the transmission housing section GG1 is apparent. In FIG. 2, it is clearly apparent that the area X for accommodating the side shaft joint GL directly abuts the differential gear AG and is arranged radially outside the electric machine EM. The transmission G and the side shaft DS, the joint GL of which is arranged in the area X, form an assembly according to example aspects of the invention.

[0029] 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.

REFERENCE CHARACTERS

[0030] G transmission [0031] GG transmission housing [0032] GG1 transmission housing section [0033] GW1 input shaft [0034] GW2 output shaft [0035] GW2-A interface of the output shaft [0036] GW22 axially parallel shaft [0037] AG differential gear [0038] IF interface [0039] EM electric machine [0040] S stator [0041] R rotor [0042] A shift element [0043] B shift element [0044] C shift element [0045] D shift element [0046] E shift element [0047] PS planetary gear set [0048] PV planetary gear set [0049] X area [0050] DS side shaft [0051] GL joint [0052] AN connecting shaft