LUBRICATION OF JOURNAL BEARING DURING CLOCKWISE AND COUNTER-CLOCKWISE ROTATION

摘要

The present disclosure is applicable to all gear trains using a journal bearing as a means of supporting gear shaft rotation. It is related in some embodiments to a system and method for supplying lubricant to the journal bearings of a gear-turbofan engine gear train when the fan rotor is subjected to a wind-milling condition in both directions, either clockwise or counterclockwise.

主权项

1. A lubrication system for a gear-turbo fan engine,
the lubrication system comprising:
a gear including a gear bearing surface, the gear operatively coupled to a shaft; anda bi-directional auxiliary pump operatively coupled to the gear, the bi-directional auxiliary pump including a first pump port and a second pump port; wherein rotation of the gear below a predetermined operational speed range in a first direction causes the bi-directional auxiliary pump to transfer lubricant outwardly from the first pump port to the gear bearing surface and wherein rotation of the gear below the predetermined operational speed range in a second direction, which is opposite to the first direction, causes the bi-directional auxiliary pump to transfer lubricant outwardly from the second pump port to the gear bearing surface.