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US 5,293,684 AGranted
Reduced material crankshaft fabrication
AssigneeTecumseh Products Company
InventorEmanuel D. Fry
Life of this patent
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Abstract
A crankshaft having a high stress portion including a crankpin and an eccentric. The high stress portion is formed of a forged steel material having a first axial end. A reduced stress portion is formed from an unforged steel material and generally comprises a tubular cylindrical portion having a second axial end. The first axial end is secured to the second axial end by friction welding. A separate counterweight is attached to either the high stress portion or the reduced stress portion.
Claims3
A method for making a crankshaft, comprising the steps of:
- forming a high stress portion having a crankpin and an eccentric by forging a blank of steel material to a desired shape;
- forming a reduced stress portion having a tubular cylindrical portion from an unforged steel material;
- securely joining together a first axial end of said high stress portion to a second axial end of said reduced stress portion;
- and
- attaching a separate counterweight to one of said high stress portion and said reduced stress portion.
2 more elements
Dependencies are inferred from the claim text.