Oil baffles in carrier for a fan drive gear system
A gearbox assembly for a gas turbofan engine includes a sun gear rotatable about an axis and a plurality of intermediate gears driven by the sun gear. A baffle disposed between at least two of the plurality of intermediate gears includes a first gap distance within a first gap portion and a second gap distance within a second gap portion. The first gap portion is disposed between the baffle and one of the intermediate gears away from the meshed interface with the sun gear and the second gap portion is disposed near the interface with the sun gear. The first gap distance within the first gap portion is different than the second gap distance within the second gap portion to define a desired lubricant flow path.
1. A fan drive gear system for a gas turbofan engine comprising:
a sun gear rotatable about an 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 first 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 first baffle including a wedge extending into the circumferential cavity of the sun gear, a first portion and a second portion disposed between the first portion and the wedge, wherein a first gap distance between the first portion and one of the at least two intermediate gears is less than a second gap distance between the second portion and the one of the at least two intermediate gears.
2. The fan drive gear system as recited in claim 1 , wherein the second gap distance is between 1.5 and 2.5 times greater than the first gap distance.
3. The fan drive gear system as recited in claim 1 , including a carrier supporting the intermediate gears relative to the sun gear and a ring gear circumscribing the intermediate gears, wherein a ring gear baffle is supported on the carrier.
4. The fan drive gear system as recited in claim 3 wherein the first baffle is supported between sides of the carrier.
5. The fan drive gear system as recited in claim 4 , wherein side baffles are attached to each of the sides of the carrier for maintaining lubricant within the lubricant flow path.
6. The fan drive gear system as recited in claim 3 , wherein the ring gear baffle includes a wedge extending into the cavity defined on the sun gear.
7. The fan drive gear system as recited in claim 1 , wherein the first baffle defines the lubricant flow path around the at least two intermediate gears, wherein the lubricant flow path narrows in a radially outward direction from the wedge of the sun gear toward the first portion.
8. The fan drive gear system as recited in claim 1 , including a third gap portion including a spacing between the wedge and the circumferential cavity of the sun gear, the third gap portion being smaller than the second gap distance.
9. The fan drive gear system as recited in claim 1 , wherein the sun gear and the intermediate gears include oppositely facing helical gear regions.
10. A turbofan engine comprising:
a fan rotatable about an axis;
a core engine section disposed about the axis; and
a fan drive gear system driven by the core engine section for rotating the fan 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 first 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 first baffle including a wedge extending into the circumferential cavity of the sun gear, a first portion and a second portion disposed between the first portion and the wedge, wherein a first gap distance between the first portion and one of the at least two intermediate gears is less than a second gap distance between the second portion and the one of the at least two intermediate gears.
11. The turbofan engine as recited in claim 10 , wherein the second gap distance is between 1.5 and 2.5 times greater than the first gap distance.
12. The turbofan engine as recited in claim 10 , including a carrier supporting the intermediate gears relative to the sun gear and a ring gear circumscribing the intermediate gears, wherein a ring gear baffle is supported on the carrier and the first baffle is supported between sides of the carrier.
13. The turbofan engine as recited in claim 12 , including side baffles attached to the sides of the carrier for maintaining lubricant within the lubricant flow path.
14. The turbofan engine as recited in claim 12 , wherein the ring gear baffle includes a wedge extending into the cavity defined on the sun gear.
15. The turbofan engine as recited in claim 14 , wherein the first baffle defines the lubricant flow around the at least two intermediate gears and the lubricant flow path narrows in a radially outward direction from the wedge of the sun gear toward the first portion.