Lubrication mechanism design for aircraft landing gear bearings

An aircraft landing gear comprising:

• a ground-engaging carriage;
• a strut comprising a shock absorber having a piston and a cylinder configured to receive the piston, wherein the piston is operatively connected to the carriage and further comprising a deployable stay configured to attach the cylinder to an airframe;
• wherein the shock absorber further comprises:
• a lubricated upper bearing fixed to the piston and configured to slidably engage an inner surface of the cylinder;
• and
• a lubricated lower bearing extending inwardly from a lower portion of the cylinder, the lower bearing having a center axis and defining an annular bearing surface configured to slidably engage the piston outer surface;
• wherein the annular bearing surface comprises a first portion extending circumferentially more than one hundred eighty degrees about the center axis at a constant radius such that the first portion defines a circular annular segment, and a second portion closing the circular annular segment defining a shallow channel or pocket in the annular bearing surface.