Journal pin oil supply for gear system

A turbomachine epicyclic gear system comprising:

• a sun gear rotatable around an axis;
• a ring gear radially outward of the sun gear;
• a plurality of intermediate gears meshed with the sun gear and the ring gear;
• and
• a plurality of journal pins each configured to support one of the plurality of intermediate gears, at least one of the plurality of journal pins has a generally cylindrical body disposed about an axis, wherein the body has a supply passage in fluid communication with a recess disposed on the outer circumference of the journal pin through at least one chamber disposed in the journal pin,
• wherein the at least one chamber is radially outward of the supply passage and has an outlet to the recess, wherein a ratio of an axial length of the recess to an axial length of the body is less than about 0.5:1.

A method of designing an epicyclic gear system for a turbomachine comprising:

• configuring a ring gear radially outward of a sun gear;
• configuring at least one intermediate gear for meshed engagement with the sun gear and the ring gear;
• and
• defining a plurality of journal pins to support a corresponding plurality of intermediate gears, at least one of the journal pins to have a generally cylindrical body disposed about an axis, wherein the body has a supply passage configured to be in fluid communication with a recess disposed on the outer circumference of the journal pin through at least one chamber disposed in the journal pin, wherein the at least one chamber is radially outward of the supply passage and has an outlet to the recess, wherein a ratio of an axial length of the recess to an axial length of the body is less than about 0.5:1.