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An apparatus for rotatably mounting and axially fixing a gear on a shaft comprises a bushing fixed within a bore of the gear. A sleeve is received on and fixed relative to the shaft. The sleeve is surrounded by and journalled for rotation within the bushing. A thrust ring is fixed relative to and pr

An apparatus for rotatably mounting and axially fixing a gear on a shaft comprises a bushing fixed within a bore of the gear. A sleeve is received on and fixed relative to the shaft. The sleeve is surrounded by and journalled for rotation within the bushing. A thrust ring is fixed relative to and projects radially from the shaft on one side of the gear. A retainer on the one side of the gear defines a circular channel within which the annular thrust ring is axially confined.

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1. Apparatus for rotatably mounting and axially fixing a gear on a shaft said apparatus comprising:a bushing fixed within a bore of said gear;a sleeve received on and fixed relative to said shaft, said sleeve being surrounded by and journalled for rotation within said bushing;a thrust ring fixed rel

1. Apparatus for rotatably mounting and axially fixing a gear on a shaft said apparatus comprising:a bushing fixed within a bore of said gear;a sleeve received on and fixed relative to said shaft, said sleeve being surrounded by and journalled for rotation within said bushing;a thrust ring fixed relative to and projecting radially from said shaft on one side of said gear; andretainer means on the said one side of said gear for defining a circular channel within which said annular thrust ring is axially confined.2. The apparatus of claim 1 further comprising means for introducing a liquid lubricant between said sleeve and said bushing, and into the circular channel defined by said retainer means.3. The apparatus of claims 1 or 2 wherein said retainer means comprises confronting axially spaced annular plates configured and arranged to contact opposite faces of said thrust ring, one of said annular plates being secured to the said one side of said gear, and the other of said annular plates being carried on a circular collar secured to the said one side of said gear.4. The apparatus of claim 1 wherein said thrust ring has oppositely facing annular first bearing surfaces axially confined between annular second bearing surfaces on said retainer means.5. The apparatus of claim 4 further comprising means for introducing a liquid lubricant between said first and second bearing surfaces.6. The apparatus of claim 5 wherein said first and second bearing surfaces are configured and arranged to respond to relative rotation between said thrust ring and retainer means by distributing the liquid lubricant introduced between said first and second bearing surfaces into a plurality of angularly spaced zones of elevated pressure.7. The apparatus of claim 5 wherein said first and second bearing surfaces are annular and arranged in confronting pairs, and wherein one of the bearing surfaces of each pair is configured with a plurality of circumferentially spaced ramps arranged to coact with the other bearing surface of each pair in defining circumferentially spaced wedge-shaped pockets therebetween.8. The apparatus of claim 7 wherein each of said ramps extends circumferentially from a recess at one end to a flat land at the opposite end, with successive ramps being separated one from the other by adjacently disposed recesses and lands.9. The apparatus of claim 7 wherein each of said ramps extends circumferentially from a flat land at one end to a recess at the opposite end.10. The apparatus of claim 9 wherein successive ramps are oppositely inclined, each extending downwardly from a flat land to a recess.11. The apparatus of claim 1 wherein the interior of said bushing is internally configured with circumferentially spaced lobes.12. The apparatus of claim 1 wherein said sleeve has an external journal surface subdivided by a circular groove into two axially spaced sections, and conduit means for delivering lubricant through said shaft into said groove for distribution to the interfaces between the axially spaced sections of said journal surface and the interior of said bushing.13. The apparatus of claim 12 wherein said conduit means is additionally operative to deliver lubricant from one of said interfaces to said circular channel.