Oil capture and bypass system
An assembly for capturing lubricating liquid from a fan drive gear system of a gas turbine engine includes a gutter and an auxiliary reservoir. The gutter is positioned radially outward from a centerline axis of the gear system for capturing lubricating liquid slung from the gear system. The auxiliary reservoir is fluidically connected to the gutter for receiving and storing the lubricating liquid from the gutter. A portion of the auxiliary reservoir and a portion of the gutter have a same radial distance from the centerline axis of the gear system.
1. An assembly for capturing lubricating liquid from a fan drive gear system of a gas turbine engine, the assembly comprising:
a gutter extending circumferentially around and positioned radially outward from a centerline axis of the fan drive gear system for capturing lubricating liquid slung from the fan drive gear system; and
an auxiliary reservoir fluidically connected to the gutter for receiving and storing the lubricating liquid from the gutter, wherein a portion of the auxiliary reservoir and a portion of the gutter that is positioned to face the fan drive gear system for capturing lubricating liquid slung from the fan drive gear system have a same radial distance from the centerline axis of the fan drive gear system.
2. The assembly of claim 1 , and further comprising:
a bypass passage, fluidically connecting the auxiliary reservoir to a main scavenge passage, for discharging excess lubricating liquid from the auxiliary reservoir; and
a main reservoir fluidically connected to the main scavenge passage.
3. The assembly of claim 2 , wherein the gutter and the bypass passage are integrally formed.
4. The assembly of claim 2 , wherein the gutter and the bypass passage are cast as a single piece.
5. The assembly of claim 2 , wherein the bypass passage is positioned radially outward from the gutter.
6. The assembly of claim 2 , wherein the bypass passage shares a wall with the gutter.
7. The assembly of claim 2 , wherein the portion of the gutter and a first portion of the bypass passage have a same radial distance from the axis of the fan drive gear system.
8. The assembly of claim 7 , wherein a second portion of the bypass passage is positioned radially outward from the portion of the gutter.
9. The assembly of claim 2 , and further comprising:
an auxiliary pump fluidically connected to the auxiliary reservoir for supplying lubricating liquid from the auxiliary reservoir to bearings of the fan drive gear system; and
a main pump fluidically connected to the main reservoir for supplying lubricating liquid from the auxiliary reservoir to bearings of the fan drive gear system.
10. The assembly of claim 1 , wherein the gutter is fluidically connected to the auxiliary reservoir without a separate intervening connector pipe.
11. The assembly of claim 1 , wherein the auxiliary reservoir is positioned inside a bearing support structure.
12. The assembly of claim 1 , wherein the centerline axis of the fan drive gear system is also a centerline axis of the gas turbine engine.
13. The assembly of claim 1 , wherein the gutter, the auxiliary reservoir, and the bypass passage combine to define a flow path having each turn angle less than or equal to 60 degrees.
14. The assembly of claim 1 , wherein the gutter, the auxiliary reservoir, and the bypass passage combine to define a flow path having each turn angle less than or equal to 40 degrees.
15. The assembly of claim 1 , and further comprising a gutter exit channel angled axially and connecting the gutter to the auxiliary reservoir.
16. An assembly comprising:
a gas turbine engine having a spool connected to a fan shaft via a gear system;
a gutter extending circumferentially around the gear system for capturing lubricating liquid slung from the gear system; and
an auxiliary reservoir fluidically connected to the gutter for receiving and storing the lubricating liquid from the gutter, wherein a portion of the auxiliary reservoir and a portion of the gutter that is positioned to face the gear system for catching lubricating liquid slung from the gear system have the same radial distance from a centerline axis of the gear system.
17. The assembly of claim 16 , wherein an outer wall of the auxiliary reservoir has a radial distance from the centerline axis of the gear system that is about equal to or less than a radial distance from an outer wall of the gutter to the centerline axis of the gear system.
18. The assembly of claim 16 , and further comprising:
a bypass passage fluidically connected to the auxiliary reservoir, wherein the gutter, the auxiliary reservoir, and the bypass passage combine to define a flow path having each turn angle less than or equal to 60 degrees.
19. A method for capturing lubricating liquid from a fan drive gear system of a gas turbine engine, the method comprising:
catching lubricating liquid slung from the fan drive gear system with a gutter spaced circumferentially around the fan drive gear system;
delivering the lubricating liquid from the gutter to an auxiliary reservoir along a first flow path having each turn angle less than or equal to 60 degrees, wherein a portion of the auxiliary reservoir and a portion of the gutter that is positioned to face the fan drive gear system for capturing lubricating liquid slung from the fan drive gear system have a same radial distance from a centerline axis of the fan drive gear system; and
delivering excess lubricating liquid from the auxiliary reservoir to a bypass passage along a second flow path having each turn angle less than or equal to 60 degrees.
20. The method of claim 19 , wherein the lubricating liquid flows axially forward with respect to a centerline axis of the gas turbine engine when the lubricating liquid is delivered from the gutter to the auxiliary reservoir along the first flow path.