Eaton Corporation

David M Groh

Martin W Uitvlugt

Steven L Worthington

Scott C Johnson

Chris P Kaniut

Gary Lynn Janowiak

Jon T Barrett

A biasing device for a free rocker arm in an engine valve actuating system wherein driven rocker arms are selectively engaged with the free rocker arm to provide variable valve operating characteristics. The biasing device includes interfitting, cold-formed cup-shaped members within which a compression spring is received in interference fit at one end with the body and at the other end with the plunger. In a preferred embodiment, at least two coils of the spring are in interference fit with the body to provide spring damping.

Biasing assembly for a variable valve timing mechanism

A method for making a direct acting tappet in which an oil groove and interior structure defining a weld interface are formed in a cupshaped body by a rolling process, the body is heat treated, a web and hub structure is positioned against the weld interface and the resulting assembly is subjected to a localized, capacitive discharge welding process in the weld interface area. The weld interface is formed to a specific shape to enhance the integrity of the weld. Further, a baffle member can be assembled to the web and hub structure prior to its positioning within the body member.

Method for manufacturing a direct acting hydraulic tappet

A direct acting hydraulic tappet and a method for making same in which an oil groove and interior structure defining a weld interface are formed in a cup-shaped body by a rolling process, the body is heat treated, a web and hub structure is positioned against the weld interface and the resulting assembly is subjected to a localized, capacitive discharge welding process in the weld interface area. In accordance with the invention, the weld interface is formed to a specific shape to enhance the integrity of the weld. In accordance with a further aspect of the invention, a baffle member can be assembled to the web and hub structure prior to its positioning within the body member.

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Battle Creek, MI, United States of America

David M Groh