Geared architecture gas turbine engine with planetary gear oil scavenge
A fan drive gear system for a turbofan engine according to an exemplary embodiment of this disclosure, among other possible things includes a sun gear that is rotatable about an axis, a plurality of intermediate gears driven by the sun gear, and a baffle that is disposed between at least two of the plurality of intermediate gears for defining a lubricant flow path from an interface between the sun gear and at least one of the plurality of intermediate gears. The baffle includes a channel with at least one ramp portion directing lubricant.
1. A fan drive gear system for a turbofan engine comprising:
a sun gear rotatable about an axis;
a plurality of intermediate gears driven by the sun gear; and
a baffle disposed between at least two of the plurality of intermediate gears for defining a lubricant flow path from an interface between the sun gear and at least one of the plurality of intermediate gears, the baffle including a channel with a first ramp portion and a second ramp portion configured for directing lubricant and a flow splitter disposed within the channel for splitting lubricant between the first ramp portion and the second ramp portion, wherein the flow splitter is spaced apart from a midway point of an axial width of the channel such that incoming lubricant flow is unequally distributed forward and aft of the baffle.
2. The fan drive gear system as recited in claim 1 , wherein the first ramp portion directs lubricant forward and the second ramp portion directs lubricant aft.
3. The fan drive gear system as recited in claim 2 , including a carrier supporting the intermediate gears and a ring gear circumscribing the intermediate gears, wherein the baffle is attached to the carrier and the carrier rotates about the axis.
4. The fan drive gear system as recited in claim 3 , including a forward gutter forward of the carrier and an aft gutter aft of the carrier, wherein the first ramp portion directs lubricant toward the forward gutter and the second ramp portion directs lubricant toward the aft gutter.
5. The fan drive gear system as recited in claim 4 , wherein the baffle includes an inlet opening into the channel, the inlet disposed radially inward of the first ramp portion and the second ramp portion.
6. The fan drive gear system as recited in claim 5 , wherein the flow splitter includes a splitter portion at the inlet and a support portion extending radially within the channel from the splitter portion toward the first ramp portion and the second ramp portion.
7. The fan drive gear system as recited in claim 1 , wherein the baffle includes a wedge extending into a circumferential cavity between oppositely facing helical gear regions of the sun gear.
8. A turbofan engine comprising:
a fan section rotatable about an axis;
a core engine section disposed about the axis;
a primary lubrication system including a sump for gathering lubricant;
an auxiliary lubrication system configured to supply a lubricant flow in an absence of a lubricant flow from the primary lubricant system;
a fan drive gear system driven by the core engine section for rotating fan of the fan section about the axis, the fan drive gear system including:
a sun gear rotatable about the axis, the sun gear including a circumferential cavity disposed between a first gear region and a second gear region;
a plurality of intermediate gears driven by the sun gear;
a baffle disposed between at least two of the plurality of intermediate gears for defining a lubricant flow path from an interface between the sun gear and at least one of the plurality of intermediate gears, the baffle including a channel with a first ramp portion directing lubricant to the auxiliary lubrication system, a second ramp portion directing lubricant toward the sump and a flow splitter disposed within the channel for splitting lubricant between the first ramp portion and the second ramp portion, wherein the flow splitter is spaced apart from a midway point of an axial width of the channel such that incoming lubricant flow is unequally distributed between the auxiliary lubrication system and the sump.
9. The turbofan engine as recited in claim 8 , including a carrier supporting the intermediate gears and a ring gear circumscribing the intermediate gears, wherein the baffle is attached to the carrier and the carrier rotates about the axis.
10. The turbofan engine as recited in claim 9 , including a forward gutter forward of the carrier and an aft gutter aft of the carrier, wherein the first ramp portion directs lubricant toward the forward gutter and the second ramp portion directs lubricant toward the aft gutter and the forward gutter directs lubricant to the auxiliary lubrication system and the aft gutter directs lubricant to the sump.
11. The turbofan engine as recited in claim 10 , wherein the baffle directs more lubricant to the forward gutter and the auxiliary lubrication system than lubricant directed to the aft gutter and the sump.
12. The turbofan engine as recited in claim 8 , wherein the baffle includes a wedge extending into the circumferential cavity.