SLIDING SLEEVE

Abstract

A sliding sleeve (1) of a vehicle transmission synchronization, wherein the tooth flanks (10) of the toothing (2) of the sliding sleeve (1) are surface-treated for enhanced friction.

Claims

1. A sliding sleeve for a vehicle transmission synchronization with a toothing, wherein the toothing of the sliding sleeve is surface-treated for enhanced friction.

2. The sliding sleeve according to claim 1, wherein the toothing is surface-treated on its tooth flanks which engage in a shifted state.

3. (canceled)

4. The sliding sleeve according to claim 1, wherein the toothing is nitrided.

5. The sliding sleeve according to claim 1, wherein the toothing is strength-blasted or cured.

6. The sliding sleeve according to claim 1, wherein the toothing is coated.

7. The sliding sleeve according to claim 1, wherein the toothing is microstructured.

8. The sliding sleeve according claim 1, wherein the toothing has tooth flanks facing in a circumferential direction and end-face roof tips, wherein a surface structure of the tooth flanks differs from a surface structure of the end-face roof tips.

9. A sliding sleeve for a vehicle transmission, the sliding sleeve having toothing, wherein the toothing has tooth flanks facing in a circumferential direction and end-face roof tips, wherein a surface structure of the tooth flanks differs from a tooth structure of the end-face roof tips.

10. The sliding sleeve according to claim 9, wherein the tooth flanks are surface-treated for enhanced friction.

11. The sliding sleeve according claim 10, wherein the toothing is nitrided.

12. The sliding sleeve according to claim 10, wherein the toothing is strength-blasted or cured.

13. The sliding sleeve according to claim 10, wherein the toothing is coated.

14. The sliding sleeve according to claim 10, wherein the toothing is microstructured.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In the figures:

[0018] FIG. 1 shows a partial view of a first sliding sleeve with internal toothing and

[0019] FIG. 2 shows a perspective view of a further sliding sleeve.

DETAILED DESCRIPTION

[0020] The schematic illustration of FIG. 1 shows a partial view of a sliding sleeve 1 with a toothing 2 designed as internal toothing. The toothing 2 is designed in a known manner as straight toothing. The individual teeth 3, 5 of the toothing each have a flattened cross-section 4 with inclined tooth flanks 10 tapering upwards. Some of the teeth 5 have a flattened cross-section on the end side as a roof pitch 6, which can serve in particular for improved presynchronization when the sliding sleeve 1 is axially displaced in the direction of a gear wheel with external toothing (not shown). In addition to the toothing 2, the annular sliding sleeve 1 comprises a closed toothing ring 7, which carries the toothing 2, and a groove-like engagement 9 for a shifting element (not shown), in particular for a shift fork, is attached to its outer jacket 8 in a rotationally fixed manner.

[0021] The toothing 2 has tooth flanks 10 which are oriented in the circumferential direction. On the end side, the tooth flanks 10 merge into the roof pitches 6, which in turn open into V-shaped end faces 13, 14. Together with the roof pitches 6, the end faces 13, 14 form roof tips. The entire sliding sleeve 1 of FIG. 2 is nitrided, wherein the tooth flanks 10 are surface-treated in such a way that their friction with the counter-toothing is greater than it would be in the untreated state. Their surface structure and thus their coefficient of friction also differs in the present case from that of the tooth roofs 12, the tooth bases 11 and that of the roof pitches 6 and end faces 13, 14 due to the duration and conditions of the nitriding process.

LIST OF REFERENCE SYMBOLS

[0022] 1 Sliding sleeve [0023] 2 Internal toothing [0024] 3 Tooth [0025] 4 Flattened cross-section [0026] 5 Tooth [0027] 6 Roof pitch [0028] 7 Toothing ring [0029] 8 Outer jacket [0030] 9 Engagement [0031] 10 Tooth flank [0032] 11 Tooth base [0033] 12 Tooth roof [0034] 13 End face [0035] 14 End face