PISTON COOLANT GALLERY

摘要

A cast piston (15), for an internal combustion engine or pump, has an integral coolant ring gallery (21), with localised extensions (22), to achieve a coolant interchange with the gallery upon piston reciprocation; to that end at least a portion of an extension lies generally parallel to the longitudinal piston axis, and towards an upper end of the piston adjacent the working fluid; affording an attendant increase in surface area exposed to coolant, allowing either a decrease in operational piston temperature, or an increase in allowable heat flow into the piston from a working fluid.