Hub assembly for a torque converter and related method

1. A hub assembly for a torque converter comprising:

a turbine hub including an inner radial surface, an outer radial surface and a channel for providing fluid from the inner radial surface to the outer radial surface, the turbine hub including a first seal and a second seal on the outer radial surface and a plenum groove in the outer radial surface axially between the first seal and the second seal, the channel extending radially into the plenum groove, the plenum groove being defined by a first plenum groove wall extending radially inward from a first outer surface wall, a second plenum groove wall extending radially inward from a second outer surface wall and a third plenum groove wall connecting the first plenum groove wall and the second plenum groove wall by extending axially from the first plenum groove wall to the second plenum groove wall, at least one of the first plenum groove wall and the second plenum groove wall being inclined with respect to a center axis about which the hub assembly is configured to rotate such that the at least one of the first plenum groove wall and the second plenum groove wall extends axially away from the third plenum groove wall, the third plenum groove wall being inclined with respect to the center axis.

2. The hub assembly as recited in claim 1 wherein the turbine hub further includes a radially extending flange for connecting to a turbine shell.

3. The hub assembly as recited in claim 1 wherein the outer radial surface of the turbine hub includes a first portion and a second portion, the first seal being imbedded in a first groove in the first portion, the second seal being imbedded in a second groove in the second portion.

4. The hub assembly as recited in claim 3 wherein the plenum groove extends from the first portion to the second portion of the outer radial surface.

5. The hub assembly as recited in claim 3 wherein the first portion has a first radial height and the second portion has a second radial height greater than the first radial height.

6. The hub assembly as recited in claim 1 further comprising a further hub concentrically outside of the turbine hub, the first seal and second seal contacting an inner radial surface of the further hub.

7. The hub assembly as recited in claim 6 wherein the further hub is configured for fixing to a torque converter front cover.

8. The hub assembly as recited in claim 6 wherein the further hub includes a further hub channel for fluidly connecting with the channel in the turbine hub via a pressure chamber formed radially between the turbine hub and the further hub and axially between the first and second seals.

9. A torque converter comprising:

a turbine; and

the hub assembly as recited in claim 1 fixed to the turbine for transmitting torque from the turbine to a transmission input shaft.

10. The torque converter as recited in claim 9 wherein the hub assembly further comprises a further hub concentrically outside of the turbine hub, the first seal and second seal contacting an inner radial surface of the further hub, the torque converter further comprising a piston axially slidable with respect to the further hub.

11. The torque converter as recited in claim 10 further comprising a front cover, the further hub being fixed to the front cover.

12. The hub assembly as recited in claim 1 wherein both of the first plenum groove wall and the second plenum groove wall are inclined with respect to the center axis such that both the first plenum groove wall and the second plenum groove wall extend axially away from the third plenum groove wall in opposite directions.

13. A method of forming a hub assembly for a torque converter comprising:

forming a plenum groove in an outer radial surface of a turbine hub;

forming a channel in the turbine hub extending radially from an inner radial surface of the turbine hub to the outer radial surface, the channel being axially aligned with the plenum groove;

providing a first seal on the outer radial surface of the turbine hub on a first axial side of the plenum groove and providing a second seal on the outer radial surface of the turbine hub on a second axial side of the plenum groove; and

sliding the turbine hub into a further hub such that the first and second seals contact an inner radial surface of the further hub and a chamber is formed radially between the turbine hub and the further hub and axially between the first and second seals,

the plenum groove being defined by a first plenum groove wall extending radially inward from a first outer surface wall, a second plenum groove wall extending radially inward from a second outer surface wall and a third plenum groove wall connecting the first plenum groove wall and the second plenum groove wall by extending axially from the first plenum groove wall to the second plenum groove wall, at least one of the first plenum groove wall and the second plenum groove wall being inclined with respect to a center axis about which the hub assembly is configured to rotate such that the at least one of the first plenum groove wall and the second plenum groove wall extends axially away from the third plenum groove wall, the third plenum groove wall being inclined with respect to the center axis.

14. The method as recited in claim 13 further comprising forming a first seal groove in the outer radial surface of the turbine hub and forming a second seal groove in the outer radial surface of the turbine hub, the first seal being provided in the first seal groove, the second seal being provided in the second seal groove.

15. The method as recited in claim 13 wherein the further hub includes a further hub channel extending from the inner radial surface thereof to an outer radial surface thereof, the further hub channel being aligned for fluid communication with the channel of the turbine hub via the chamber.