PLUG-IN SHAFT ARRANGEMENT AND HUB-REDUCTION AXLE FOR A MOTOR VEHICLE

Abstract

A stub shaft assembly for an outer planetary axle (1) of a motor vehicle includes an inner shaft (9) and an outer shaft (10) comprising a helically toothed sun gear (4). A pair of toothings (11) with a first helical toothing and a second helical toothing is effective between the inner shaft (9) and the outer shaft (10). Also disclosed is an outer planetary axle (1) for a motor vehicle comprising at least one such stub shaft assembly.

Claims

1. A stub shaft assembly for an outer planetary axle (1) of a motor vehicle, comprising: an inner shaft; an outer shaft (10) comprising a helically toothed sun gear (4); and a pair of toothings (11) comprising a first helical toothing and a second helical toothing between the inner shaft (9) and the outer shaft (10).

2. The stub shaft assembly according to claim 1, wherein the first helical toothing is implemented as an outer toothing and the second helical toothing is implemented as an inner toothing.

3. The stub shaft assembly according to claim 2, wherein the helically toothed sun gear has a helix direction that is the same as a helix direction of the first helical toothing and/or a helix direction of the second helical toothing.

4. The stub shaft assembly according to claim 3, characterized in that a helix angle of the first helical toothing and/or a helix angle of the second helical toothing is at least approximately equal in slope to a helix angle of toothing of the sun gear.

5. The stub shaft assembly according to claim 4, comprising a releasable axial securing means (14) between the inner shaft (9) and the outer shaft (10).

6. The stub shaft assembly according to claim 5, wherein the releasable axial securing means (14) comprises a resiliently releasable securing element (15).

7. The stub shaft assembly according to claim 6, wherein the axial securing means (14) comprises a ramp element (18) for releasing the releasable securing element (15).

8. An outer planetary axle (1) for a motor vehicle, wherein the axle (1) comprises at least one stub shaft assembly according to claim 1.

9. The axle (1) according to claim 8, wherein the axle (1) includes a differential gear and at least one helically toothed planetary gear train (2) comprising a sun gear (4), planetary gears (5), a planet carrier (6), and a ring gear (7), wherein the at least one stub shaft assembly is between the differential gear and the at least one planetary gear train (2).

10. The axle (1) according to claim 9, wherein the pair of toothings (11) between the inner shaft (9) and the outer shaft, and a pair of toothings between the sun gear (4) and the planetary gears (5), are configured such that an axial load (12) of the pair of toothings (11) between the inner shaft (9) and the outer shaft (10) and such that an axial load (13) of a pair of toothings between the sun gear (4) and the planetary gears (5) at least approximately offset one another.

11. A stub shaft assembly for an outer planetary axle (1) of a motor vehicle, comprising: an inner shaft (9); an outer shaft (10) comprising a helically toothed sun gear (4); a pair of toothings (11) comprising a first helical toothing and a second helical toothing between the inner shaft (9) and the outer shaft (10); and a releasable axial securing means (14) between the inner shaft (9) and the outer shaft (10).

12. The stub shaft assembly according to claim 11, wherein the releasable axial securing means (14) comprises a resiliently releasable securing element (15).

13. The stub shaft assembly according to claim 12, wherein the axial securing means (14) comprises a ramp element (18) for releasing the releasable securing element (15).

14. The stub shaft assembly according to claim 11, wherein the pair of toothings (11) between the inner shaft (9) and the outer shaft are configured such that an axial load (12) of the pair of toothings (11) between the inner shaft (9) and the outer shaft (10) at least approximately offset one another.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] A design example of the invention is described in more detail in the following with reference to figures. The figures schematically and by way of example show:

[0023] FIG. 1: an outer planetary axle comprising a split axial load-free stub shaft and

[0024] FIG. 2: a releasable axial securing means of a split axial load-free stub shaft.

DETAILED DESCRIPTION

[0025] FIG. 1 shows a section of an outer planetary axle 1. The outer planetary axle 1 comprises a differential gear (not visible here), two planetary gear trains, such as the planetary gear train 2, and a split stub shaft, such as the stub shaft 3, disposed between the differential gear and the planetary gear train 2.

[0026] The planetary gear train 2 is and comprises a helically toothed sun gear 4, helically toothed planetary gears, such as the planetary gear 5, a planet carrier 6 and a fixed helically toothed ring gear 7. The planet carrier 6 forms a vehicle wheel hub 8 for receiving a vehicle wheel. The sun gear 4 is drive-connected to the stub shaft 3. The drive of the vehicle wheel is provided from the differential gear over the stub shaft 3, the sun gear 4, the planetary gear trains 5, the planet carrier 6 and the vehicle wheel hub 8.

[0027] The stub shaft 3 is split and comprises an inner shaft 9 and an outer shaft 10. A pair of toothings 11 comprising an inner helical toothing disposed on the inner shaft 9 and an outer helical toothing disposed on the outer shaft 10 is effective between the inner shaft 9 and the outer shaft 10.

[0028] The pair of toothings 11 and the helically toothed sun gear 4 have the same helix directions and helix angles which comprise the same slopes, so that an axial load 12 of the pair of toothings 11 and an axial load 13 of the pair of toothings between the sun gear 4 and the planetary gears 5 offset one another. Furthermore, when the outer shaft 10 rotates about the shaft axle 12 relative to the inner shaft 9 and the planetary gears 5, the same axial displacements occur at the pair of toothings 11 and at the sun gear 4, so that the outer shaft 10 can be axially disassembled.

[0029] A releasable axial securing means 14, which is shown in detail in FIG. 2, is effective between the inner shaft 9 and the outer shaft 10. The axial securing means 14 comprises a securing element 15 implemented as a locking spring ring, which is received in an axially form-locking manner in a groove 16 on the inner shaft 9 on the one hand and in a groove 17 on the outer shaft 10 on the other hand. The groove 17 is beveled on one side, whereby the beveled flank of the groove 17 serves as a ramp element 18, so that, when the outer shaft 10 is axially displaced, the securing element 15 is deformed radially against a spring force and the axial securing means 14 is released.

[0030] The word “can” refers in particular to optional features of the invention. There are therefore also further developments and/or design examples of the invention which additionally or alternatively comprise the respective feature or features.

[0031] If necessary, isolated features can also be selected from the combinations of features disclosed here and can be used in combination with other features to delimit the subject matter of the claim, while resolving a structural and/or functional relationship that may exist between the features.

LIST OF REFERENCE NUMERALS

[0032] 1 Outer planetary axle

[0033] 2 Planetary gear train

[0034] 3 Stub shaft

[0035] 4 Sun gear

[0036] 5 Planetary gear

[0037] 6 Planet carrier

[0038] 7 Ring gear

[0039] 8 Vehicle wheel hub

[0040] 9 Inner shaft

[0041] 10 Outer shaft

[0042] 11 Pair of toothings

[0043] 12 Axial load

[0044] 13 Axial load

[0045] 14 Axial securing means

[0046] 15 Securing element

[0047] 16 Groove

[0048] 17 Groove

[0049] 18 Ramp element