Synchronizer ring for a synchronization unit of a manual transmission and method for manufacturing such synchronizer ring

Patent metadata

Field	Value
Publication number	US-9605717-B2
Application number	US-201514731301-A
Country	US
Kind code	B2
Filing date	Jun 4, 2015
Priority date	Jun 5, 2014
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

A synchronizer ring for a synchronization unit of a manual transmission has a ring axis and is formed of a ring-shaped sheet-metal cone with a substantially constant sheet thickness. The ring-shaped sheet-metal cone has a cone-shaped radial outer side and an opposite radial inner side with a cone-shaped friction surface, wherein on its radial outer side the sheet-metal cone includes an integrally molded centering collar for radially centering the synchronizer ring relative to a synchronizer hub of the synchronization unit. The sheet-metal cone is deformed in the region of the centering collar and includes a first sheet portion with a residual thickness reduced as compared to the sheet thickness and axially adjacent a second sheet portion with a collar thickness which at least corresponds to the sheet thickness. The residual thickness of the sheet-metal cone is substantially constant in the first sheet portion.

First claim

The invention claimed is:

1. A synchronizer ring for a synchronization unit of a manual transmission, comprising:
a ring-shaped cone having a first axial end, a second axial end, a radial outer side, and a radial inner side,
wherein the ring-shaped cone tapers radially inward from the first axial end toward the second axial end,
wherein the radial outer side includes a protrusion extending radially outward and having a curved surface and configured for radially centering the synchronizer ring relative to a synchronizer hub,
wherein the ring-shaped cone has a groove extending axially from the protrusion toward the second axial end and defining an area, and
wherein the ring-shaped cone has a constant radial thickness in the area of the groove.

2. The synchronizer ring according to claim 1 , wherein the ring-shaped cone extends radially outward at its first axial end and includes locking teeth.

3. The synchronizer ring according to claim 1 , wherein the protrusion has a radial abutment surface configured for engaging the synchronizer hub.

4. The synchronizer ring according to claim 1 , wherein the radial outer side includes a plurality of protrusions spaced circumferentially.

5. The synchronizer ring according to claim 4 , wherein a radial outer side includes at least three protrusions.

6. The synchronizer ring according to claim 4 , wherein the protrusions are uniformly distributed around the circumference of the ring-shaped cone.

7. The synchronizer ring according to claim 1 , wherein the area of the groove defines a first sheet portion of the ring-shaped cone, and the ring-shaped cone further comprises a second sheet portion including the protrusion and extending axially from the first sheet portion to the first axial end, wherein the first sheet portion has a radial thickness that is less than a radial thickness of the ring-shaped cone at a location circumferentially adjacent the first sheet portion, and wherein the second sheet portion has a radial thickness that is greater than or equal to a radial thickness of the ring-shaped cone at a location circumferentially adjacent the second sheet portion.

8. The synchronizer ring according to claim 1 , wherein the ring-shaped cone is formed from sheet-metal.

9. The synchronizer ring according to claim 1 , wherein the radial outer side and the radial inner side are cone-shaped.

10. The synchronizer ring according to claim 1 , wherein the protrusion and the groove are formed by deforming the radial outer side of the ring-shaped cone.

11. The synchronizer ring according to claim 1 , wherein the protrusion and the groove are circumferentially aligned.

12. The synchronizer ring according to claim 1 , wherein the curved surface of the radial outer side is spaced from the second axial end of the ring-shaped cone.

13. The synchronizer ring according to claim 2 , wherein the locking teeth extend circumferentially around the entire ring-shaped cone.

14. A method of manufacturing the synchronization ring according to claim 1 , comprising:
adjusting a tool for integrally shaping the protrusion of the ring-shaped cone to a desired radial position relative to the second axial end of the ring-shaped cone; and
axially moving the tool relative to the ring-shaped cone substantially parallel to the radial inner side of the ring-shaped cone from the second axial end toward the first axial end, thereby deforming the radial outer side of the ring-shaped cone and forming the protrusion.

Assignees

• Hoerbiger Antriebstechnik Hold

Inventors

• Negele Berthold

Classifications

• F16D23/025 Primary

  Synchro rings · CPC title

• F16D2250/0023

  Shaping by pressure · CPC title

• B21J5/12

  Forming profiles on internal or external surfaces (making screw-thread by forging, pressing, or hammering B21K) · CPC title

• B21D53/16

  rings, e.g. barrel hoops · CPC title

• B21D53/26

  wheels or the like · CPC title