US 6,746,018 B2Granted

Shaft seal

AssigneeEmerson Power Transmission Manufacturing, L.P.

InventorsMichael L. Lewis, Christopher A. Carrigan, Erwin R. Carrigan, Steven H. Griggs

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Abstract

A multiple shaft seal arrangement positioned between a shaft and an inside diameter surface of an aperture in a wall. The multiple shaft seal arrangement has a flinger attached to the shaft with a face seal mounted to the flinger. A double lip oil seal is mounted to the inside diameter of the aperture. The flinger is positioned such that the face seal is pressed against the double lip oil seal. Accordingly, rotation of the shaft causes rotation of the flinger and face seal. This centrifugally throws contaminants, such as particulate matter, away from the aperture. The void between the face seal and the inside diameter of the aperture is filled with grease or similar substance. The combination of these elements greatly prohibits debris, moisture, particulate matter or other environmental elements from passing from one side of the multiple shaft seal arrangement to the other.

Claims6

Dependent claims

A speed reducer comprising:

a housing having an aperture, an outside of the housing defining an external environment and an inside of the housing defining an internal environment, the aperture passing from the external environment to the internal environment;
a shaft passing through the aperture;
a multiple shaft seal arrangement positioned between an outer diameter of the shaft and an inside diameter of the aperture, the multiple shaft seal arrangement comprising:
a disc mounted and rotatably affixed to the outer diameter of the shaft such that the disc rotates with the shaft, the disc extending radially from the shaft to a terminating position spaced from the inside diameter of the aperture, the disc having a first side facing the external environment and a second side oppositely disposed from the first side;
a face seal having a face seal lip and being mounted and rotatably affixed to the second side of the disc, wherein the face seal rotates with the disc and wherein the face seal lip is radially spaced further from the inside diameter of the aperture than the terminating position;
a second disc mounted to the inside diameter of the aperture and extending radially toward the shaft, the second disc spaced from the outside diameter of the shaft, the face seal pressed against the second disc;
and
an oil seal mounted to the second disc which is pressed against the outer diameter of the shaft.

5 more elements

Dependencies are inferred from the claim text.