Piston for water pump and related method
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United States of America Patent
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-
Apr 6, 1999
Grant Date -
N/A
app pub date -
Jan 8, 1997
filing date -
Jan 8, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed is a piston for a water pump, e.g., a pressure washer pump. The piston includes a piston body and a piston head and in the improvement, the piston body is solid, homogeneous ceramic. That is, the piston body has a generally cylindrical surface and the body is circumscribed by the surface and is homogeneous ceramic. A method for making a piston for a water pump includes the steps of providing a piston body made of a ceramic material, and making a piston head of steel and having a pocket formed therein. The head is heated, the pocket and the body are engaged in overlapping relationship and the head is allowed to cool and 'shrink-fit' to the piston body. The piston head is formed to have a relief groove circumscribing the pocket for reducing compression forces resulting from such cooling.
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