Synchronizing ring and gear changing transmission for a vehicle

1. A synchronizing ring for a synchronization device ( 2 ) of a gear changing transmission, including a conical ring body ( 3 ) with an inner friction surface ( 4 ) and an outer installation surface ( 5 ) bounding the ring body ( 3 ) in a radial circumferential direction (U), extending perpendicular to an axial synchronizing ring axis ( 6 ) and extending conically at a predefinable angle of friction about the axial synchronizing ring axis ( 6 ) of the synchronizing ring, wherein the ring body ( 3 ) is bounded in the axial direction at a largest cone diameter by a gear wheel surface ( 7 ) with a gear wheel ( 71 ) extending substantially perpendicularly to the synchronizing ring axis ( 6 ) and at a smallest cone diameter by a hub surface ( 8 ) and wherein, for the fixing of the synchronizing ring in a cylindrical cavity ( 9 ) of a synchronizing ring hub ( 10 ) in an installed state, means providing security against rotation ( 11 ) is provided, which is integrally connected to the ring body ( 3 ) and extends in a direction away from the gear wheel surface ( 7 ) of the ring body ( 3 ), characterized in that for the guidance of the installation surface ( 5 ) in the cylindrical cavity ( 9 ) a guiding element ( 12 ) is provided at the means providing security against rotation ( 11 ), and wherein the guiding element ( 12 ) extends starting from the means providing security against rotation ( 11 ) in the circumferential direction (U); and wherein the guiding element ( 12 ) extends in the circumferential direction (U) in a region between an outer surface of the means providing security against rotation ( 11 ) and the outer installation surface ( 5 ) with respect to a distance from the axial synchronizing ring axis ( 6 ); wherein the radially outer surface of the means providing security against rotation ( 11 ) has a greater radial distance from the axial synchronizing ring axis ( 6 ) than the guiding element ( 12 ).

2. A synchronizing ring in accordance with claim 1 , wherein the guiding element ( 12 ) is an integral part of the means providing security against rotation ( 11 ).

3. A synchronizing ring in accordance with claim 1 , wherein the guiding element ( 12 ) extends starting from the means providing security against rotation ( 11 ) in the circumferential direction (U), with in particular three means providing security against rotation ( 11 ) being provided, each with a respective guiding element ( 12 ).

4. A synchronizing ring in accordance with claim 1 , wherein the guiding element ( 12 ) extends at a side of the means providing security against rotation ( 11 ) remote from the gear wheel surface ( 7 ) along the means providing security against rotation ( 11 ) in the circumferential direction (U).

5. A synchronizing ring in accordance with claim 1 , wherein the means providing security against rotation ( 11 ) with the guiding element ( 12 ) is provided via a bridge ( 14 ) at a holding lug ( 15 ).

6. A synchronizing ring in accordance with claim 1 , wherein the gear wheel surface ( 7 ) is interrupted by a recess ( 13 ), in particular by one, or two or three, or more than three recesses ( 13 ) and for the means providing security against rotation ( 11 ) is connected in the recess ( 13 ) to the ring body.

7. A synchronizing ring in accordance with claim 1 , wherein as many means providing security against rotation ( 11 ) as recesses ( 13 ) are provided in the gear wheel surface ( 7 ).

8. A synchronizing ring in accordance with claim 1 , wherein the means providing security against rotation ( 11 ) is formed as a securing lug ( 111 ), which extends on the outer side of the ring body ( 3 ) remote from the synchronizing ring axis ( 6 ) in substantially the same direction parallel to the installation surface ( 5 ).

9. A synchronizing ring in accordance with claim 8 , wherein the securing lug ( 111 ) is a securing lug ( 1110 ) with a pocket like recess.

10. A synchronizing ring in accordance with claim 1 , wherein no friction coating ( 41 ) is provided on the friction surface ( 4 ) and the synchronizing ring is in particular a part of a multi-cone synchronization device.

11. A synchronizing ring in accordance with claim 1 wherein a wear reducing and or a friction optimized friction medium ( 41 ), in particular a friction coating ( 41 ), specifically a molybdenum coating ( 41 ) and/or a friction layer ( 41 ), in particular a carbon friction layer ( 41 ) and/or a different friction medium ( 41 ) is provided on the friction surface ( 4 ).

12. A synchronizing ring in accordance with claim 1 , wherein the synchronizing ring is a shaped sheet metal part formed from a deep drawing quality metal sheet.

13. A gear changing transmission for a vehicle, in particular for an automobile, a van or a heavy goods vehicle with a synchronizing ring ( 1 ) in accordance with claim 1 .

14. A synchronizing ring in accordance with claim 12 , wherein the metal sheet is steel.

15. A synchronizing ring in accordance with claim 14 , wherein the steel is at least one of C35 steel, C45 steel, C55 steel, C80 steel and C80M steel.