Torque converter with parallel torsional vibration dampers

1. A torque converter, comprising:

a cover arranged to receive torque;

a pump;

a turbine hydraulically coupled to the pump and including a turbine shell;

a turbine clutch including a radially outermost portion of the turbine shell;

a first torsional vibration damper with:

a first input plate non-rotatably connected to the turbine shell;

an output flange arranged to non-rotatably connect to an input shaft for a transmission; and,

a plurality of springs engaged with the first input plate or the output flange;

a second torsional vibration damper including:

a second input plate;

an output plate arranged to non-rotatably connect to the input shaft for the transmission; and,

at least one first spring engaged with the second input plate and the output plate;

a lock-up clutch including an axially displaceable piston plate arranged to non-rotatably connect the cover and the second input plate;

a first fluid circuit arranged to supply first pressurized fluid to open the turbine clutch;

a second fluid circuit arranged to supply second pressurized fluid to close the turbine clutch or open the lock-up clutch; and,

a third fluid circuit arranged to supply third pressurized fluid to close the lock-up clutch.

2. The torque converter of claim 1 , wherein the first, second, and third fluid circuits are controllable to:

close the turbine clutch while keeping the lock-up clutch open or closed; or,

open the turbine clutch while keeping the lock-up clutch open or closed.

3. The torque converter of claim 1 , wherein the first, second, and third fluid circuits are controllable to:

close the lock-up clutch while keeping the turbine clutch open; or,

open the lock-up clutch while keeping the turbine clutch closed.

4. The torque converter of claim 1 , wherein the first, second, and third fluid circuits are controllable to:

close the turbine clutch while closing the lock-up clutch or opening the lock-up clutch; or,

open the turbine clutch while closing the lock-up clutch or opening the lock-up clutch.

5. The torque converter of claim 1 , wherein the first, second, and third fluid circuits are controllable to:

close the lock-up clutch while closing the turbine clutch or opening the turbine clutch; or,

open the lock-up clutch while closing the turbine clutch or opening the turbine clutch.

6. The torque converter of claim 1 , wherein the first, second, and third fluid circuits are controllable to:

simultaneously open or close the turbine clutch and the lock-up clutch; or,

keep the turbine clutch and the lock-up clutch simultaneously open or closed.

7. The torque converter of claim 1 , wherein:

the first, second, and third fluid circuits are controllable to create a torque path from the cover to the output flange while isolating the second input plate from the cover; or,

the first, second, and third fluid circuits are controllable to create a torque path from the cover to the output plate while enabling relative rotation between the turbine shell and the cover.

8. The torque converter of claim 1 , wherein the first, second, and third fluid circuits are controllable to simultaneously create:

a first torque path from the cover to the output flange through the turbine clutch; and,

a second torque path, separate from the first torque path, from the cover to the output plate through the lock-up clutch.

9. The torque converter of claim 1 , further comprising:

a first chamber at least partially formed by the pump and the turbine; and,

a second chamber at least partially formed by the cover and the turbine shell, wherein:

the first fluid circuit is arranged to provide the first pressurized fluid to the first chamber; and,

the second fluid circuit is arranged to provide the second pressurized fluid to the second chamber.

10. The torque converter of claim 1 , further comprising:

a first chamber at least partially formed by the cover and the turbine shell; and,

a second chamber at least partially formed by the cover and the axially displaceable piston plate, wherein:

the second fluid circuit is arranged to provide the second pressurized fluid to the first chamber; and,

the third fluid circuit is arranged to provide the third pressurized fluid to the second chamber.

11. The torque converter of claim 10 , wherein the second chamber is sealed from the first chamber.

12. The torque converter of claim 1 , wherein:

the first torsional vibration damper includes a first cover plate;

the plurality of springs includes second and third springs;

first input plate and the first cover plate are engaged with the second spring; and,

the first cover plate and the output flange are engaged with the third spring.

13. The torque converter of claim 1 , wherein:

the second torsional vibration damper includes a pressure plate non-rotatably connected to the cover; and,

at least a portion of the first input plate is axially located between the axially displaceable piston plate and the pressure plate.

14. A torque converter, comprising:

a cover arranged to receive torque;

a pump non-rotatably connected to the cover;

a turbine including a turbine shell;

a turbine clutch including a radially outermost portion of the turbine shell;

a first torsional vibration damper including:

a first input plate non-rotatably connected to the turbine shell;

a first cover plate;

an output flange arranged to non-rotatably connect to an input shaft for a transmission; and,

a plurality of springs, each first spring in the plurality of springs engaged with at least one of the first input plate, the first cover plate, or the output flange;

a second torsional vibration damper including:

a second input plate;

an output plate arranged to non-rotatably connect to the input shaft for the transmission; and,

a second spring engaged with the second input plate and the output plate; and,

a lock-up clutch including an axially displaceable piston plate arranged to non-rotatably connect the cover and the second input plate, wherein:

operation of the turbine clutch is independent of operation of the lock-up clutch; and,

operation of the lock-up clutch is independent of operation of the turbine clutch.

15. The clutch of claim 14 , further comprising:

a first fluid circuit arranged to supply first pressurized fluid to open the turbine clutch;

a second fluid circuit arranged to supply second pressurized fluid to close the turbine clutch or open the lock-up clutch; and,

a third fluid circuit arranged to supply third pressurized fluid to close the lock-up clutch.

16. The torque converter of claim 15 , wherein the first, second, and third fluid circuits are controllable to:

create a first torque path from the cover to the output flange while isolating the second input plate from the cover; or,

create a second torque path from the cover to the output plate while enabling relative rotation between the turbine shell and the cover; or,

simultaneously create:

the first torque path from the cover to the output flange through the first vibration damper; and,

the second torque path from the cover to the output plate through the second vibration damper.

17. The torque converter of claim 15 , further comprising:

a first chamber at least partially formed by the pump and the turbine and connected to the first fluid circuit;

a second chamber at least partially formed by the cover and the turbine shell and connected to the second fluid circuit; and,

a third chamber at least partially formed by the cover and the axially displaceable piston plate and connected to the third fluid circuit.

18. A torque converter, comprising:

a cover arranged to receive torque;

a pump non-rotatably connected to the cover;

a turbine including a turbine shell;

a turbine clutch;

a first torsional vibration damper including a plurality of springs and an output flange arranged to non-rotatably connect to an input shaft for a transmission;

a second torsional vibration damper including at least one spring and an output plate arranged to non-rotatably connect to the input shaft;

a lock-up clutch;

when the turbine clutch is closed, a first torque path from the turbine shell to the output flange through the first vibration damper; and,

when the lock-up clutch is closed, a second torque path, separate from the first torque path, from the cover to the output plate through the second vibration damper.

19. The torque converter of claim 18 , wherein:

the turbine clutch and the lock-up clutch are arranged to be simultaneously open or simultaneously closed; or,

the turbine clutch is arranged to be opened or closed while the lock-up clutch is open or closed; or,

the lock-up clutch is arranged to be opened or closed while the turbine clutch is open or closed.