Transmission device for a motor vehicle

Abstract

A transmission device for a motor vehicle includes a planetary gearset and a spur gear differential. The planetary gearset includes a drive sun gear, a ring gear fixed to the housing, and multiple stepped planetary gears. Each stepped planetary gear has a first gear meshing with the drive sun gear and a second gear meshing with the ring gear. The spur gear differential includes multiple first and second compensation gears. Each first compensation gear meshes with a first output sun gear, each second compensation gear meshes with a second output sun gear, and the first and second compensation gears mesh with each other in pairs. One compensation gear of each compensation gear pair is arranged in phase with a respective stepped planetary gear. The other compensation gear of each compensation gear pair overlaps axially and contactlessly with the second gear.

Claims

1. A transmission device for a motor vehicle, comprising: a planetary gearset having a drive sun gear, a ring gear fixed to a housing, and multiple stepped planetary gears, each stepped planetary gear having a first and a second gear that are rotationally fixed to each other, wherein the first gear meshes with the drive sun gear and wherein the second gear meshes with the ring gear; and a spur gear differential having a first and a second output sun gear and multiple first and second compensation gears, wherein the first compensation gears mesh with the first output sun gear, wherein the second compensation gears mesh with the second output sun gear, and wherein each of the first compensation gears meshes with one of the second compensation gears; wherein all of the stepped planetary gears and all of the compensation gears are rotatably mounted at least indirectly on a common planet carrier; wherein each first compensation gear is arranged in phase with a respective stepped planetary gear; wherein each second compensation gear overlaps axially and contactlessly with one of the second gears; and wherein each first compensation gear is coaxial with the respective stepped planetary gear and is arranged together with the respective stepped planetary gear on a common bearing element.

2. The transmission device according to claim 1, wherein each second compensation gear is mounted on the common planet carrier via pins formed thereon.

3. The transmission device according to claim 1, wherein the first and second output sun gears have a same number of teeth.

4. The transmission device according to claim 1, wherein the first compensation gears have different numbers of teeth compared to the second compensation gears.

5. The transmission device according to claim 1, wherein the first and second compensation gears have straight teeth.

6. The transmission device according to claim 1, wherein a number of first compensation gears is equal to a number of second compensation gears and equal to a number of stepped planetary gears, wherein the number of stepped planetary gears is at least three.

7. A drive device for a motor vehicle, comprising an electric drive machine and a transmission device operatively connected therewith according to claim 1.

8. A transmission device for a motor vehicle, comprising: a drive sun gear; a ring gear fixed to a housing; a carrier; a plurality of stepped planetary gears supported for rotation with respect to the carrier, each stepped planetary gear having a first gear meshing with the drive sun gear and having a second gear meshing with the ring gear; a first output sun gear; a second output sun gear; a plurality of first compensation gears, each first compensation gear supported for rotation with respect to the carrier, in phase with a respective planetary gear, and meshing with the first output sun gear; and a plurality of second compensation gears, each second compensation gear supported for rotation with respect to the carrier, overlaps axially and contactlessly with the second gears, and meshing with the second output sun gear and one of the first compensation gears, wherein each first compensation gear is coaxial with the respective stepped planetary gear and is supported together with the respective stepped planetary gear on a common bearing element.

9. The transmission device according to claim 8, wherein each second compensation gear is mounted on the carrier via pins formed thereon.

10. The transmission device according to claim 8, wherein the first and second output sun gears have a same number of teeth.

11. The transmission device according to claim 8, wherein the first compensation gears have a greater number of teeth than the second compensation gears.

12. The transmission device according to claim 8, wherein the first and second compensation gears have straight teeth.

13. The transmission device according to claim 8, wherein a number of first compensation gears is equal to a number of second compensation gears and equal to a number of stepped planetary gears, and wherein the number of stepped planetary gears is at least three.

14. A drive device for a motor vehicle, comprising: a transmission device according to claim 8; and a motor having a rotor drivably connected to the drive sun gear.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further measures are shown in more detail below together with the description of an exemplary embodiment. In the figures,

(2) FIG. 1 shows a schematic perspective view to illustrate the structure of a transmission device,

(3) FIG. 2 shows a schematic side view of the transmission device according to FIG. 1,

(4) FIG. 3 shows a schematic cross-sectional view of the transmission device according to FIGS. 1 and 2,

(5) FIG. 4 shows a further schematic sectional view of the transmission device according to FIGS. 1 to 3, and

(6) FIG. 5 shows a greatly simplified schematic view to illustrate the structure of a drive device with the transmission device according to FIGS. 1 to 4.

DETAILED DESCRIPTION

(7) In FIGS. 1, 2, 3 and 4, a transmission device 1 for a motor vehicle is shown. FIG. 5 shows a drive device with an electric drive machine 12 and the transmission device 1 according to FIGS. 1 to 4. Depending on the respective perspective and the respective section, not all components of the transmission device 1 are shown in each figure.

(8) According to FIGS. 1 to 5, the transmission device 1 has a planetary gearset 2 and a spur gear differential transmission 6. The planetary gearset 2 comprises a drive sun gear 3, a ring gear 4 fixed to the housing and multiple stepped planetary gears 5, each of which has a first and a second gear 5a, 5b that are rotationally fixed to each other. The first gear 5a meshes with the drive sun gear 3, and the second gear 5b meshes with the ring gear 4. The ring gear 4 is connected in a rotationally fixed manner to a housing 13 of the transmission device 1. The housing 13 is only shown in a simplified manner in FIG. 5. In the FIGS. 1 to 4, a plug-in gearing 14 is shown on the outer circumferential surface of the ring gear 4. The ring gear 4 is connected in a rotationally fixed manner to the housing 13 via the plug-in gearing 14.

(9) The spur gear differential transmission 6 comprises a first and second output sun gear 7a, 7b and multiple first and second compensation gears 8a, 8b. The first compensation gears 8a mesh with the first output sun gear 7a. The second compensation gears 8b mesh with the second output sun gear 7b. Furthermore, each first and second compensation gear 8a, 8b mesh with one another in pairs and thereby form a compensation gear pair 8a, 8b. All of the stepped planetary gears 5 and all of the compensation gears 8a, 8b are rotatably mounted at least indirectly on a common planet carrier 9, wherein the planet carrier has a first and a second planet carrier half 9a, 9b, that are rotationally fixed to each other. In FIG. 2, the second planet carrier half 9b is not shown for an improved plan view of the compensation gear pairs 8a, 8b. The first compensation gear 8a of a respective compensation gear pair 8a, 8b is arranged in phase with a respective stepped planetary gear 5. The respective compensation gear 8a which is arranged in phase with the respective stepped planetary gear 5 is formed coaxially with the respective stepped planetary gear 5 and is arranged together with the respective stepped planetary gear 5 on a common bearing element 10, in this case designed as a hollow bolt.

(10) In the present case, the two output sun gears 7a, 7b have the same number of teeth. The two output sun gears 7a, 7b have the same outside diameter and the same widths. The spur gear differential transmission 6 is thus symmetrical. Furthermore, the first compensation gears 8a have a higher number of teeth than the second compensation gears 8b. All compensation gears 8a, 8b are designed with straight teeth. In contrast, the gears 5a, 5b of the stepped planetary gears 5 are designed with helical teeth. The number of first compensation gears 8a is equal to the number of second compensation gears 8b and equal to the number of stepped planetary gears 5, wherein in this case three stepped planetary gears 5 are provided.

(11) The respective second compensation gear 8b which is not arranged in phase with a respective stepped planetary gear 5 overlaps axially and contactlessly with the second gear 5b. The axial overlap of the second compensation gear 8b with the second gear 5b and in particular also the ring gear 4, which meshes with the second gear 5b, is shown particularly clearly in FIGS. 3 and 4. It should be noted that FIG. 5 is shown in a greatly simplified manner, wherein an axial overlap of the second compensation gear 8b with the second gear 5b from FIG. 5 is not evident due to the simplified view. The respective second compensation gear 8b which is not arranged in phase with the respective stepped planetary gear 5 is mounted on the common planet carrier 9 via two pins 11a, 11b formed thereon. These pins 11a, 11b are shown particularly clearly in FIGS. 4 and 5.

(12) According to FIG. 5, the electric drive machine 12 comprises a stator 15 and a rotor 16, wherein the rotor 16 is connected in a rotationally fixed manner with the drive shaft 17. Furthermore, the drive shaft 17 is connected to the drive sun gear 3 in a rotationally fixed manner. The respective output sun gear 7a, 7b is connected in a rotationally fixed manner to a respective output shaft 18a, 18b. The drive shaft 17 is arranged coaxially to the two output shafts 18a, 18b, wherein the drive shaft 17 is designed as a hollow shaft.

LIST OF REFERENCE SYMBOLS

(13) 1 Transmission device

(14) 2 Planetary gearset

(15) 3 Drive sun gear

(16) 4 Ring gear

(17) 5 Stepped planetary gear

(18) 5a, 5b Gear

(19) 6 Spur gear differential transmission

(20) 7a, 7b Output sun gear

(21) 8a, 8b Compensation gear

(22) 9 Planetary carrier

(23) 9a, 9b Planetary carrier half

(24) 10 Bearing element

(25) 11a, 11b Pins

(26) 12 Drive machine

(27) 13 Housing

(28) 14 Plug-in gearing

(29) 15 Stator

(30) 16 Rotor

(31) 17 Drive shaft

(32) 18a, 18b Output shaft