Hydrodynamic bearing

A hydrodynamic bearing comprising:

• an axially extending sleeve defining a central bore, the sleeve having a radial bearing surface forming a periphery of the central bore, the radial bearing surface defining:
• a plurality of circumferentially spaced oil channels extending axially through a portion of the sleeve, each of the oil channels having an open end configured to receive oil and a closed end having a dam configured to retain the oil within the oil channels,
• a plurality of circumferentially spaced lands, each being circumferentially disposed between a pair of the channels,
• a plurality of first ramps, each extending from a corresponding one of the channels to a corresponding one of the lands of the radial bearing surface, wherein each of the first ramps of the radial bearing surface slopes outwardly from the corresponding one of the channels to the corresponding one of the land of the radial bearing surface, and
• a plurality of second ramps, each extending from a corresponding one of the channels to a corresponding one of the land of the radial bearing surface, wherein each of the second ramps slopes outwardly from the corresponding one of the channels to the corresponding one of the land of the radial bearing surface;
• and
• an annular washer extending radially outward from the sleeve, the washer having an annular bearing face defining:
• a plurality of circumferentially spaced oil grooves extending between inner and outer diameters of the face and in fluid communication with the oil channels,
• a plurality of circumferentially spaced lands, each being circumferentially disposed between a pair of the grooves,
• a plurality of first ramps, each extending from a corresponding one of the grooves to a corresponding one of the lands, wherein each of the first ramps slopes outwardly from the corresponding one of the grooves to the corresponding one of the lands, and
• a plurality of second ramps, each extending from a corresponding one of the grooves to a corresponding one of the lands, wherein each of the second ramps slopes outwardly from the corresponding one of the grooves to the corresponding one of the lands.

A hydrodynamic bearing comprising:

• an axially extending sleeve defining a central bore;
• and
• an annular washer extending radially outward from the sleeve, the washer having an annular hydrodynamic bearing face defining a plurality of circumferentially spaced oil grooves each having opposing first and second lips extending between inner and outer diameters of the washer, and plurality of circumferentially spaced thrust segments arranged about the washer in alternating arrangement with the grooves such that each of the thrust segments is disposed between an associated pair of the grooves, the thrust segments being bi-directionally ramped and configured carry a wedge-shaped thrust-load oil film;
• wherein
• the sleeve has a hydrodynamic bearing surface forming a periphery of the central bore, the bearing a surface defining a plurality of circumferentially paced oil channels having opposing first and second axially extending lips and being aligned with the oil grooves of the washer, each of the oil channels having an open end configured to receive oil from a corresponding one of the oil grooves and a closed end defining a dam configured to retain the oil, the bearing surface further defining a plurality of circumferentially spaced radial-bearing segments alternating with the channels such that each of the radial-bearing segments is disposed between an associated pair of the channels, the radial-bearing segments being bi-directionally ramped and configured carry a wedge-shaped radial-load oil film.