Axle gear arrangement

Abstract

Axle transmission arrangement (1) for branching a drive power introduced via a power input (2) by a drive unit (3) to a first power output (4) and to a second power output (5), comprising a central first planetary gear (6) having a first sun gear (7), a first planetary gear set (8), a first planetary carrier (9), and a first ring gear (10), a second planetary gear (11) having a second sun gear (12), a second planetary gear set (13), a second planetary carrier (14), and a second ring gear (15), and a third planetary gear (16) having a third sun gear (17), a third planetary gear set (18), a third planetary carrier (19), and a third ring gear (20), wherein the first sun gear (7) forms the power input (2), the second ring gear (15) forms the first power output (4), and the third planetary carrier (19) forms the second power output (5).

Description

Field of the invention

[0001] The present invention relates to an axle transmission arrangement for branching a drive power introduced via a power input from a drive unit to a first power output and to a second power output. State of the art

[0002] Axle gear arrangements of the above-mentioned type are used in motor vehicles to transmit a drive torque from a drive unit to two output shafts, in particular to a left and a right half-shaft of a motor vehicle axle of the motor vehicle and ultimately to driven wheels.

[0003] The axle gear arrangement can be used to increase or decrease the input speed of the drive unit to a desired output speed.

[0004] It is known that axle drive arrangements may include a differential to allow a speed difference between the first and second output shafts.

[0005] Furthermore, it is known that such axle drive arrangements can utilize a planetary gear to distribute the drive torque to the output shafts. Solutions already exist that utilize multiple planetary gears, which typically require a larger axial installation space. Such gears are known, for example, from DE 10 2014 201 245 A1 or DE 10 2011 102 749 A1. Summary of the invention

[0006] It is an object of the invention to provide an axle transmission arrangement which, in addition to a compact design, is characterized by a design which is advantageous with regard to its mechanical operating behavior, in particular with regard to the speed ratio.

[0007] This need can be met by the subject matter of the present invention according to independent claim 1. Advantageous embodiments of the present invention are described in the dependent claims.

[0008] The axle drive arrangement according to the invention serves to branch a drive power introduced via a power input from a drive unit to a first power output and to a second power output

[0009] According to the invention, the axle drive arrangement comprises three planetary gears, namely a central first planetary gear, a second planetary gear and a third planetary gear.

[0010] According to the invention, the central first planetary gear comprises a first sun gear, a first planetary gear set, a first planetary carrier and a first ring gear.

[0011] According to the invention, the second planetary gear comprises a second sun gear, a second planetary set, a second planet carrier and a second ring gear.

[0012] According to the invention, the third planetary gear comprises a third sun gear, a third planetary set, a third planet carrier and a third ring gear.

[0013] According to the present invention, the first sun gear forms the power input, the second ring gear forms the first power output and the third planet carrier forms the second power output of the axle drive arrangement.

[0014] In a particularly preferred embodiment, the first planet carrier is fixedly connected to the second sun gear in a rotationally fixed manner, the second planet carrier is fixedly connected to a stationary component of the axle drive arrangement and is fixedly connected to the third ring gear in a rotationally fixed manner, and the first ring gear is fixedly connected to the third sun gear.

[0015] In this context, the term “rotatably connected” can be understood as both a one-piece design of the non-rotatably connected components and a fixed drive-effective connection between the non-rotatably connected components.

[0016] Particularly preferably, the first sun gear is or can be connected in a drive-effective manner to a drive shaft driven by the drive unit. In this context, the term "drive-effectively connected" can be understood to mean both a one-piece design of the components and a fixed drive-effective connection between the components.

[0017] Furthermore, the second ring gear is particularly preferably connected or connectable in a driving manner to a first half-shaft of a motor vehicle axle and the third planet carrier is connected or connectable in a driving manner to a first half-shaft of a motor vehicle axle.

[0018] The axle drive arrangement is preferably designed such that it is arranged entirely on one side, namely essentially next to the drive unit.

[0019] Furthermore, the axle gear arrangement and the drive unit are preferably arranged coaxially.

[0020] Preferably, the drive unit is designed as an electric machine.

[0021] The inventive design of the axle drive arrangement enables a high speed ratio to be realized in addition to a differential function. Brief description of the drawings

[0022] The invention is described below by way of example with reference to the drawings. Fig. 1 shows a schematic representation of an axle drive arrangement. Detailed description of the invention

[0023] In Fig. Figure 1 shows an axle drive assembly 1 according to the invention. The axle drive assembly 1 has a power input 2 and two power outputs, namely a first power output 4 and a second power output 5.

[0024] Furthermore, the axle drive arrangement 1 has three nested planetary gears, namely a central first planetary gear 6, a second planetary gear 11 (with respect to Fig. 1 to the right of the central first planetary gear 6) and a third planetary gear 16 (with respect to Fig. 1 left of the central first planetary gear 6).

[0025] The central first planetary gear 6 has a first sun gear 7, a first planetary gear set 8, a first planet carrier 9 and a first ring gear 10.

[0026] The second planetary gear 11 has a second sun gear 12, a second planetary set 13, a second planet carrier 14 and a second ring gear 15.

[0027] The third planetary gear 16 has a third sun gear 17, a third planetary set 18, a third planet carrier 19 and a third ring gear 20.

[0028] The first sun gear 7 forms the power input 2 of the axle transmission arrangement 1 by being drive-effectively connected to a drive shaft 22 of a drive unit 3, namely an electric machine.

[0029] The second ring gear 15 forms the first power output 4 of the axle drive arrangement 1 by being connected to a first half-shaft 23 of a motor vehicle axle (with respect to Fig. 1 the left half-shaft) is connected to the drive.

[0030] The third planet carrier 18 forms the second power output 5 of the axle drive arrangement 1 by being connected to a second half-shaft 24 of the motor vehicle axle (with respect to Fig. 1 the right half-shaft) is connected to the drive.

[0031] The nesting of the individual planetary gears 6, 11, 16 results from the first planet carrier 9 being fixed in a rotationally fixed manner to the second sun gear 12, the second planet carrier 14 being fixed to a stationary component 21 of the axle drive arrangement 1 and being fixed in a rotationally fixed manner to the third ring gear 20, and the first ring gear 10 being fixed in a rotationally fixed manner to the third sun gear 17.

[0032] The axle drive arrangement 1 and the electric machine 3 are arranged coaxially and the axle drive arrangement 1 is also designed such that it is arranged entirely on one side of the drive unit 3, namely essentially next to the drive unit 3 (with respect to Fig. 1 to the left of the drive unit 3). List of reference symbols 1 axle drive arrangement 2 power input 3 Drive unit 4 First power output 5 Second power output 6 Central first planetary gear 7 First sun gear 8 First planetary set 9 First planet carrier 10 First ring gear 11 Second planetary gear 12 Second sun gear 13 Second planetary gear set 14 Second planet carrier 15 Second ring gear 16 Third planetary gear 17 Third sun gear 18 Third planetary gear set 19 Third planet carrier 20 Third ring gear 21 Fixed component 22 Drive shaft 23 First half-wave 24 Second half-wave QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2014 201 245 A1

[0005] DE 10 2011 102 749 A1

[0005]

Claims

[1] Axle gear arrangement (1) for branching a drive power introduced via a power input (2) by a drive unit (3) to a first power output (4) and to a second power output (5), comprising - a central first planetary gear (6) comprising a first sun gear (7), a first planetary gear set (8), a first planetary carrier (9) and a first ring gear (10), - a second planetary gear (11) comprising a second sun gear (12), a second planetary gear set (13), a second planetary carrier (14) and a second ring gear (15), and - a third planetary gear (16) having a third sun gear (17), a third planetary set (18), a third planetary carrier (19) and a third ring gear (20), wherein the first sun gear (7) forms the power input (2), the second ring gear (15) forms the first power output (4) and the third planetary carrier (19) forms the second power output (5). [2] Axle gear arrangement (1) according to claim 1, characterized by that the first planet carrier (9) is connected in a rotationally fixed manner to the second sun gear (12), the second planet carrier (14) is fixed to a stationary component (21) of the axle transmission arrangement (1) and is connected in a rotationally fixed manner to the third ring gear (20), and the first ring gear (10) is connected in a rotationally fixed manner to the third sun gear (17). [3] Axle gear arrangement (1) according to claim 1 or 2, characterized in that the first sun gear (7) is or can be connected in a drivingly effective manner to a drive shaft (22) drivable by the drive unit (3). [4] Axle gear arrangement (1) according to claim 1, 2 or 3, characterized by that the second ring gear (15) is or can be connected in a driving manner to a first half-shaft (23) of a motor vehicle axle. [5] Axle gear arrangement (1) according to one of claims 1 to 4, characterized bythat the third planet carrier (19) is or can be connected in a driving manner to a first half-shaft (23) of a motor vehicle axle. [6] Axle gear arrangement (1) according to one of the preceding claims, characterized by that the axle drive arrangement (1) is designed such that it is arranged entirely on one side of the drive unit (3), namely substantially next to the drive unit (3). [7] Axle gear arrangement (1) according to one of the preceding claims, characterized by that the axle gear arrangement (1) and the drive unit (3) are arranged coaxially. [8] Axle drive arrangement (1) according to one of the preceding claims, characterized by that the drive unit (3) is designed as an electrical machine.

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