초록 ▼

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 a

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.

대표청구항 ▼

[ What is claimed is:] [1.] In a piston for a water pump and wherein the piston includes a cylindrical piston body extending along a long axis and a piston head, the improvement wherein:the piston body has a substantially uniform diameter along its entire length;the piston body is ceramic and the bo

[ What is claimed is:] [1.] In a piston for a water pump and wherein the piston includes a cylindrical piston body extending along a long axis and a piston head, the improvement wherein:the piston body has a substantially uniform diameter along its entire length;the piston body is ceramic and the body diameter is significantly less than the body length along the long axis;the piston body has a proximal end and the head is around the proximal end and thereby secured to the body;the head is metal and includes a wall contacting the proximal end along the length of the wall, such wall defining a cylindrical pocket receiving the proximal end;the head includes a rounded protruding nose portion configured to be fitted to a shoe contacting the nose portions; andthe piston head has a retainer flange extending parallel to the long axis and includes an annular relief groove between the wall and the flange.