Torque converter with turbine mass absorber

1. A torque converter comprising:

a first damper stage;

a second damper stage;

a floating flange torsionally connecting said first and second damper stages;

an inertia element; and

a tuned torsion damper, wherein said torsion damper connects said inertia element and said flange.

2. The torque converter of claim 1 , wherein said inertia element is a turbine.

3. The torque converter of claim 1 , wherein said first damper stage is a radially outer damper stage and said second damper stage is a radially inner damper stage.

4. The torque converter of claim 1 , wherein said torsion damper generates a friction torque when rotated.

5. The torque converter of claim 1 , wherein said torsion damper comprises an elastic member with a linear zero torque transition.

6. The torque converter of claim 5 , wherein said elastic member comprises a torsionally elastic plate.

7. The torque converter of claim 6 , wherein said plate is rigidly connected to said flange and said turbine element.

8. The torque converter of claim 6 , wherein said plate further comprises an axial offset, said flange further comprises an axial offset, and said plate offset is less than said flange offset.

9. The torque converter of claim 5 , wherein said elastic member comprises a coil spring.

10. The torque converter of claim 1 , wherein a total rotational travel of said torsion damper is between 2 degrees and 20 degrees.

11. The torque converter of claim 10 , wherein said travel is between 6 degrees and 10 degrees.

12. The torque converter of claim 11 , wherein the total rotational travel of said torsion damper is limited by a connection with lash between said inertial element and said flange.

13. The torque converter of claim 12 , wherein said lash connection comprises a rivet disposed in a slot in said flange.

14. The torque converter of claim 12 , wherein said lash connection comprises a spline connection.

15. A torque converter comprising:

a radially outer first damper stage;

a radially inner second damper stage;

a floating flange with a first axially offset portion, said flange torsionally connecting said first and second damper stages;

a turbine; and

a torsionally elastic plate with a linear zero torque transition and a second axially offset portion rigidly connected to said turbine and said flange, wherein said first offset portion is more axially offset than said second offset portion and wherein contact between said first and second offset portions generates a friction torque when said torsion damper is rotated.

16. A method of operating a torque converter comprising the steps of:

receiving a torque into a first damper stage;

transmitting said torque from said first damper stage to a floating flange;

transmitting said torque from said floating flange to a second damper stage; and,

connecting an inertia element to the flange through a tuned torsion damper to suppress a resonance of said flange.

17. The method of claim 16 , further comprising the step of tuning said torsion damper to reduce a high frequency peak by adjusting a spring rate and a friction of said damper with the flange.

18. The method of claim 17 , wherein said friction is between 5 Nm and 20 Nm.

19. The method of claim 17 , wherein said spring rate is calculated to move a resonance of said inertia element to a point below a lugging limit.

20. The method of claim 16 , wherein said inertia element is a turbine of said torque converter.

21. The method of claim 16 , wherein a total rotational travel of said torsion damper is between 2 degrees and 20 degrees.

22. The method of claim 19 , wherein said travel is between 6 degrees and 10 degrees.