Oil cooled runner
An oil cooled runner, for a rotary seal between an engine case and a shaft rotationally mounted to the case, includes an annular runner ring having a platform with a radially outer seal engagement surface and a radially inner surface, and an oil distributor having a radially inner portion in communication with a source of liquid lubricant and an outer lubricant casting cone with a rim disposed radially inwardly from the inner surface of the platform.
1. An oil cooled runner, for a rotary seal between an engine case and a shaft rotationally mounted to the case, the runner comprising:
an annular runner ring having a platform with a radially outer seal engagement surface and a radially inner surface; and
an oil distributor having a radially inner portion in communication with a source of liquid lubricant and an outer lubricant casting cone with a rim disposed radially inwardly from the inner surface of the platform.
2. The oil cooled runner of claim 1 , wherein the inner portion of the oil distributor includes axially extending oil passages.
3. The oil cooled runner of claim 2 , wherein the oil passages comprise axial grooves in an inner shaft engagement surface.
4. The oil cooled runner of claim 1 , wherein the runner ring includes an inner hub abutting the inner portion of the oil distributor, and at least one of the hub and inner portion includes radially extending oil passages.
5. The oil cooled runner of claim 4 , wherein the radially extending oil passages comprise radial grooves in an abutting surface of the hub.
6. The oil cooled runner of claim 4 , wherein the runner ring includes an annular web between the hub and the platform.
7. The oil cooled runner of claim 6 , wherein the hub, web and platform define a concave annular recess.
8. The oil cooled runner of claim 7 , wherein the rim of the cone extends into the recess.
9. A method of controlling a radial clearance gap between a runner and a carbon seal over an operating temperature range of a gas turbine engine, the method comprising the steps of:
selecting a desired temperature of the runner relative to an engine temperature within said operating temperature range, the desired temperature of the runner causing the predetermined radial clearance gap in view of thermal growth differential between the runner and the carbon seal; and
maintaining the desired temperature of the runner by directing a flow of liquid lubricant against a surface of the runner, whereby maintaining the desired temperature of the runner controls the radial clearance gap.
10. The method of claim 9 , wherein the step of maintaining includes varying at least one of a quantity and impingement location of the liquid lubricant directed against the runner.
11. The method of claim 9 , wherein the step of maintaining includes at least one of increasing the flow of the liquid lubricant directed against the runner, to increase the radial clearance gap, and decreasing the flow of the liquid lubricant, to reduce the radial clearance gap.
12. The method of claim 9 , wherein the step of directing includes directing the flow of liquid lubricant against a radially inner surface of the runner, the inner surface being opposite a radially outer seal engagement surface facing the carbon seal.
13. The method of claim 12 , wherein the step of directing includes directing a conical layer of liquid lubricant against the radially inner surface of the runner.
14. The method of claim 9 , wherein the step of maintaining includes providing a substantially uniform layer of said liquid lubricant on said surface of the runner.