Method for Manufacturing a Synchronizer Ring and Synchronizer Ring for Synchronized Manual Transmissions

• US 20170146074A1
• Filed: 01/15/2016
• Published: 05/25/2017
• Est. Priority Date: 01/21/2015
• Status: Active Grant

• Current Assignee: Hoerbiger Antriebstechnik Holding GmbH (Hoerbiger-Stiftung)
• Original Assignee: Hoerbiger Antriebstechnik Holding GmbH (Hoerbiger-Stiftung)
• Inventors: FUERGUTH, Werner
• Granted Patent: US 9,909,627 B2
• Time in Patent Office: Days
• CPC Class Codes: B24B 1/04 subjecting the grinding or polishing tools, the abrading or polishing medium or work to vibration, e.g. grinding with ultrasonic frequency polishing or abrading surfaces on work by means of tumbling apparatus B24B31/00, involving oscillating or vibrating containers B24B31/06; superfinishing surfaces on work, e.g. by means of abrading blocks reciprocating with high frequency, B24B35/00
• CPC Class Codes: F16D 2069/004 Profiled friction surfaces, e.g. grooves, dimples
• CPC Class Codes: F16D 2250/00 Manufacturing; Assembly
• CPC Class Codes: F16D 2250/0023 Shaping by pressure
• CPC Class Codes: F16D 2250/0053 Hardening
• CPC Class Codes: F16D 23/025 Synchro rings
• CPC Class Codes: F16D 2300/10 Surface characteristics; Details related to material surfaces

Abstract

A synchronizer ring (10) for synchronized manual transmissions is manufactured by forming or reshaping a flat material of metal, wherein a conical friction surface (20) is produced, into which axial grooves (24) are incorporated by chipless machining, wherein a tool is axially shifted relative to the friction surface (20) to produce the final friction surface (20). At least the friction surface (20) is vibration-ground and subsequently hardened.

Claims

1. A method for manufacturing a synchronizer ring for synchronized manual transmissions, characterized by the following steps:

a) producing a conical friction surface;

b) incorporating axial grooves having edges and a depth into the friction surface by chipless machining wherein a tool is axially shifted relative to the friction surface to produce a final friction surface;

c) vibratory grinding of at least the friction surface; and

d) subsequent hardening of at least the friction surface.

2. The method according to claim 1, wherein hardening in achieved by nitriding.

3. The method according to claim 1, wherein producing a conical friction surface is achieved by reshaping a flat material of metal

4. The method according to claim 1, wherein at least one groove extends only axially when viewed in the axial direction.

5. The method according to claim 4, wherein all grooves only extend axially as when viewed in the axial direction.

6. The method according to claim 1, wherein the friction surface is produced by deep-drawing wherein the grooves are incorporated into the friction surface by using a correspondingly profiled deep-drawing tool for deep-drawing.

7. The method according to claim 1, wherein the grooves each include two side walls which extend obliquely to each other as as seen in radial section.

8. The method according to claim 1, wherein during vibratory grinding the edges of the grooves are rounded.

9. The method according to claim 8, wherein after vibratory grinding the edges have an edge radius in the range from 0.01 mm to 0.20 mm.

10. The method according to claim 9, wherein after vibratory grinding the edges have an edge radius in the range from 0.02 mm to 0.10 mm, as seen in radial section.

11. The method according to claim 1, wherein an oblong axial depression is incorporated into the friction surface between two adjacent grooves, whose depth is smaller than the depth of the grooves.

12. The method according to claim 11, wherein an oblong axial depression is incorporated into the friction surface between all adjacent grooves.

13. The method according to claim 11, wherein the depth of the depressions amounts to maximally 20% of the depth of the grooves.

14. The method according to claim 11, wherein the depressions have a substantially trapezoidal cross-section as seen in radial section.

15. The method according to claim 11, wherein the depressions are produced directly when incorporating the grooves into the friction surface.

16. The method according to claim 15, wherein the depressions are produced directly when incorporating the grooves into the friction surface by upsetting the wall portion forming the friction surface.

17. A synchronizer ring for synchronized manual transmissions, which includes at least one conical friction surface with axially extending grooves incorporated by chipless forming and is hardened at least in the region of the friction surface, wherein the grooves have edges that are rounded by vibratory grinding before hardening the friction surface.

18. The synchronizer ring according to claim 17, wherein the friction surface includes an oblong axial depression between two adjacent grooves each, whose depth amounts to maximally 20% of the depth of the grooves.

19. The synchronizer ring according to claim 18, wherein the friction surface includes an oblong axial between all adjacent grooves

20. The synchronizer ring according to claim 17, wherein the synchronizer ring is a blocker ring with radially protruding blocking teeth.