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US 6,270,082 B1Granted
Coextruded valve stem seal
AssigneeDana Corporation
InventorTimothy A. Hegemier
Life of this patent
Estimating the term…
Abstract
A coextruded valve stem seal is provided that includes a sleeve having an upper and lower portion, a central vertical axis, and a generally concentric aperture. The sleeve includes an inner layer an inner layer of a resilient sealing material, such as a rubber, and an outer layer of a coextrudable rigid material, such as a plastic material. The lower portion of a preferred embodiment of the sleeve may include a radially extending flange. A method for making the valve stem seal in accordance with the principles of the invention is also disclosed.
Claims10
A valve stem having a valve stem seal, the valve stem seal comprising:
- a coextruded sleeve having a central vertical axis, a substantially concentric aperture, and an upper portion and a lower portion, the upper and lower portions including an inner layer made of a first material, and an outer layer made of a second material coextruded with the first material, the upper portion forming an upper seal with the valve stem, the lower portion including an outwardly-extending radial flange having top and bottom surfaces, the bottom surface forming a lower seal with an engine block head.
Dependencies are inferred from the claim text.