Lightweight engine poppet valve
AssigneeEaton Corporation
InventorsMajo Cecur, Marco Querio, Sinharoy Shubhayu, Sundaram L. Narasimhan, Jose F. Masello
Life of this patent
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Abstract
A lightweight engine poppet valve that has a valve head portion made from a lightweight, heat resistant material is attached to a hollow tube stem portion. The attachment is made with a mechanically locking interfitting joint on an extending portion of the valve head at a preselected distance. Preferably, the mechanically locking interfitting joint is a hydroformed joint.
Claims20
An engine poppet valve comprising a valve head portion, a stem portion, a tip portion, and a flared fillet portion of said valve head portion defining a transition region between said valve head portion and said stem portion, said flared fillet portion of said valve head portion including an extending portion, said valve head portion being a substantially lightweight, heat resistant material, said stem portion being a hollow tube constructed for a mechanically locking interfitting joint with said extending portion of said flared fillet portion.
An engine poppet valve, comprising:
- a valve head made of an intermetallic compound, said valve head having a fillet portion with an extending portion having a preselected length;
- and
- a valve stem, said valve stem being a hollow tube and having one end constructed to slidably receive the extending portion of said valve head and be mechanically locked thereto with an interfitting joint, said valve stem further having a tip portion at an opposite end from said valve head.
A method for making a lightweight engine poppet valve, comprising the steps of:
- forming a valve head from an intermetallic material;
- providing the valve head with a fillet having an extending portion with a preselected length;
- providing a tubular stem portion;
- positioning the extending portion of the valve head inside one end of the tubular stem portion;
- and
- compressing the tubular stem portion around the extending portion of the valve head for forming a mechanically locking interfitting joint between the extending portion of the valve head and the tubular stem portion.
Dependencies are inferred from the claim text.