US 4,491,374 AGranted

Screw pump lubrication system

AssigneeSundstrand Corporation

InventorsBehzad Hagshenas, Donald W. Butler, Anson S. Coolidge

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Abstract

This invention relates to a self-priming screw pump lubrication system. The system 10 includes a central feed tube which communicates at one end with lubricant in a reservoir or sump and at the other end to the central region of an assembly that includes a horizontally disposed rotating shaft. The shaft having thereon threaded portions of opposite pitch mounted within a pair of mating sleeves which sleeves are biased away from each other at the central region of the assembly. The other ends of the sleeves are in abutting relationship with the outer races of a pair of angular contact bearings to be lubricated. Each of the inner races of the bearings are mounted on the rotary shaft. Lubricant slingers are mounted on the rotating shaft at a point remote from the bearings and cooperate with the lubricant that has been drawn upward through the central feed tube and delivered to and past the bearings, whereupon the slingers propel the lubricant back to the reservoir for reuse.

A self-priming high speed screw pump lubrication assembly, including in combination, a rotary shaft mounted in the inner races of a pair of spaced apart bearings to be lubricated, the outer races of said bearing pair positioned against the inner surface of a tubular member fitted in a housing, a source of lubricant stored within said housing, a pair of rotary seal means positioned on said tubular member and between said tubular member and said rotary shaft, such that said rotary shaft passes therethrough, said pair of bearings located between said rotary seal means,

first and second concentric sleeves positioned on said rotary shaft and between said bearings, said sleeves spaced apart thereby creating a lubrication chamber formed by said rotary shaft said sleeves and said tubular member, said sleeves each have a portion formed such that said sleeve only contacts said outer race of said bearings to be lubricated,
biasing means positioned between said sleeves to thereby force said sleeves against said outer bearing races,
a conduit coupled to and through said tubular member having one end in communication with said lubrication chamber and another end in communication with said source of lubricant,
said rotary shaft having oppositely threaded surfaces thereon in the region of said sleeves, said threaded portions in cooperation with said sleeves upon rotation of said rotary shaft acting as a screw pump to thereby draw lubricant from said source of lubricant through said conduit into said lubrication chamber and thence cause said lubricant to flow in a direction between said rotary shaft and said sleeves to be delivered toward said bearings to be lubricated and thereafter returned to said source of lubricant in said housing,
the diameter of said rotary shaft having said threaded portions being greater than the diameter of said rotary shaft passing through said inner races of said pair of bearings,
said rotary shaft having position thereon a pair of bladed oil slingers at a point adjacent to said bearings and on a side opposite to the direction of said lubricant flow,
said oil slingers being located within said tubular member and concentrically mounted in respect to said rotary shaft.

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Abstract

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