Friction element for a frictional shifting element for a vehicle transmission

Patent metadata

Field	Value
Publication number	US-10514072-B2
Application number	US-201615741597-A
Country	US
Kind code	B2
Filing date	Jun 7, 2016
Priority date	Jul 7, 2015
Publication date	Dec 24, 2019
Grant date	Dec 24, 2019

Abstract

A friction element (1, 3) for a frictional shift element for a transmission of a vehicle, the friction element having an annular base body with a plurality of friction surface elements (5), the plurality of friction surface elements (5) protruding radially inwardly or radially outwardly and are distributed over a periphery of the annular base body. The friction element (1, 3) and the plurality of friction surface elements (5) are each formed as one piece.

First claim

The invention claimed is:

1. A friction element ( 1 , 3 ) for a frictional shift element for a transmission of a vehicle, comprising:
an annular base body defining a plurality of recesses ( 16 ) distributed over a periphery of the annular base body; and
a plurality of friction surface elements ( 5 ), each of the plurality of friction surface elements ( 5 ) being received in a respective one of the plurality of recesses ( 16 ) such that the plurality of friction surface elements ( 5 ) protrude radially inwardly or radially outwardly from the annular base body,
wherein the annular base body and the plurality of friction surface elements ( 5 ) are each formed as one piece, and
wherein each of the plurality of friction surface elements ( 5 ) is fixed to the annular base body.

2. The friction element ( 1 , 3 ) of claim 1 , wherein the plurality of recesses ( 16 ) are distributed on the annular base body along an inner circumference of the annular base body or an outer circumference of the annular base body.

3. The friction element ( 1 , 3 ) of claim 1 , further comprising:
a plurality of friction surface element zones ( 25 ); and
a plurality of intermediate zones ( 22 ),
wherein each of the plurality of friction surface element zones ( 25 ) is defined by one of the plurality of recesses ( 16 ),
wherein each of the plurality of intermediate zones ( 22 ) is arranged between a pair of circumferentially adjacent friction surface element zones of the plurality of friction surface element zones ( 25 ),
wherein each of the plurality of intermediate zones ( 22 ) has a central zone ( 24 ) between two transition zones ( 23 ), the central zone ( 24 ) has a first radius R 3 , each of the two transition zones ( 23 ) has a radius R 4 , and each of the two transition zones ( 23 ) is tangential to the central zone ( 24 ) and a respective one of the plurality of friction surface element zones ( 25 ).

4. The friction element ( 1 , 3 ) of claim 1 , wherein each of the plurality of friction surface elements ( 5 ) is fixed by a respective fixing means to the annular base body.

5. The friction element ( 1 , 3 ) of claim 1 , wherein each of the plurality of friction surface elements ( 5 ) is fixed to the annular base body at least point by point along a respective joint line ( 17 ).

6. The friction element ( 1 , 3 ) of claim 1 , wherein the plurality of friction surface elements ( 5 ) is welded to the annular base body.

7. The friction element ( 1 , 3 ) of claim 1 , wherein the annular base body has a first thickness (D 1 ) in an axial direction, and each of the plurality of friction surface elements ( 5 ) has a second thickness (D 2 ) in the axial direction, wherein the first thickness (D 1 ) is different from the second thickness (D 2 ).

8. The friction element ( 1 , 3 ) of claim 1 , wherein each of the plurality of friction surface elements ( 5 ) has chamfers.

9. The friction element ( 1 , 3 ) of claim 1 , wherein each of the plurality of friction surface elements ( 5 ) has grooves.

10. The friction element ( 1 , 3 ) of claim 1 , wherein each of the plurality of friction surface elements ( 5 ) is beveled or conical in an axial direction.

11. A friction surface element ( 5 ) for the friction element ( 1 , 3 ) of claim 1 .

12. A method for producing a friction element ( 1 , 3 ) for a frictional shift element for a transmission of a vehicle, the friction element ( 1 , 3 ) having an annular base body and a plurality of friction surface elements ( 5 ), the plurality of friction surface elements ( 5 ) being distributed over a periphery of the annular base body and protruding radially inwardly or radially outwardly from the periphery, said method comprising:
manufacturing the annular base body from a first material in a first step ( 110 );
manufacturing a plurality of recesses ( 16 ) in a second step ( 120 ), the plurality of recesses ( 16 ) distributed on the annular base body along an inner circumference or an outer circumference of the annular base body;
manufacturing the plurality of friction surface elements ( 5 ) in a third step ( 130 ), each of the plurality of friction surface elements ( 5 ) being formed as one piece from the first material or a second material in the third step ( 130 ), each of the plurality of friction surface elements ( 5 ) being receivable within a respective one of the plurality of recesses ( 16 ); and
joining each of the plurality of friction surface elements ( 5 ) to the annular base body at the respective one of the plurality of recesses ( 16 ) in a fourth step.

13. The method of claim 12 , wherein joining the plurality of friction surface elements ( 5 ) to the annular base body comprises performing a forming process, wherein the forming process is carried out at each of the plurality of friction surface elements ( 5 ) and at the annular base body at least point by point along a respective joint line ( 17 ).

14. The method of claim 12 , wherein joining the plurality of friction surface elements ( 5 ) to the annular base body comprises performing a forming process, wherein the forming process is carried out at each of the plurality of friction surface elements ( 5 ) or at the annular base body at least point by point along a respective joint line ( 17 ).

15. The method of claim 12 , wherein joining the plurality of friction surface elements ( 5 ) to the annular base body comprises welding the plurality of friction surface elements ( 5 ) to the annular base body.

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Reisch Matthias
• Sibla Christian

Classifications

• F16D2200/0021

  Steel · CPC title

• F16D13/648 Primary

  for clutches with multiple lamellae · CPC title

• F16D13/69

  Arrangements for spreading lamellae in the released state · CPC title

• F16D2250/0076

  Welding, brazing · CPC title

• F16D2023/0643

  Synchro friction clutches with flat plates, discs or lamellae · CPC title