Low pressure differential compensator

Details Low pressure differential compensator Low pressure differential compensator

1984-02-21

1985-11-12

Novosad, Stephen J.

Boring or penetrating the earth

With storage means for bit lubricant carried by bit or shaft

With fluid pressure-actuated feed means

175339, E21B 1024

Patent

active

045522286

ABSTRACT:
A low pressure differential compensator for use in a lubrication system having a lubricant reservoir is provided, the reservoir providing lubricant to a bearing area between relatively rotatable elements having a seal therebetween. In particular, the low pressure differential compensator includes a flexible elongated diaphragm having a plurality of longitudinally-extending ribs which expand radially with respect to the longitudinal axis of the reservoir in response to the pressure differential across the seal. The radially collapsing and expanding flexible diaphragm is free operating and has no inherent restrictions which require increased pressure to overcome. Therefore, the pressure differential across the seal is minimized, increasing the effective life of the seal.

REFERENCES:
patent: 3721306 (1973-03-01), Sartor
patent: 4161223 (1979-07-01), Oelke
patent: 4276946 (1981-07-01), Millsapps, Jr.
patent: 4358384 (1982-11-01), Newcomb
patent: 4407375 (1983-10-01), Nakamura
patent: 4448268 (1984-05-01), Fuller

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