Dana Corporation

J. Dudley Binford

Philip L. Bond

Ivan J. Bruns

David F. Fiedler

David F Fiedler

J Dudley Binford

Philip L Bond

Ivan J Bruns

A valve stem seal assembly includes a rigid cylindrical shell and an annular resilient seal body contained entirely within the shell. Integral to the seal body is a frustoconical sealing element adapted to engage a valve guide of an internal combustion engine. The sealing element converges radially inwardly, and upon installation of the assembly on a valve guide the outer surface of the sealing element bends further radially inwardly to effectively seal the top surface of the guide. The seal body includes a stem sealing aperture, which in one preferred embodiment is designed to engage the valve stem without a spring. In a same or similar embodiment, the shell contains a circumferential array of tangs for retention of the assembly on the guide.

Frustoconical valve stem sealing element

A piston comprises a piston pin bore adapted to at least partially contain a piston pin. The bore is finished by a roll burnishing process which substantially simultaneously prestresses, smooths and distorts the bore into a predetermined hourglass configuration.

Piston pin bore and method of finishing

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Richmond, IN, United States of America

David F Fiedler