Pistons for use in fluid displacement apparatus such as swash plate-type compressors has a head portion with a aperture formed through it's surface

摘要

The piston comprises a head portion with a cylindrical shape and a hollow structure and a connecting portion extending from an end surface of the head portion and couples the piston to a moving source. An aperture is formed through the end surface of the head portion adjacent to the connecting portion and a rib is formed adjacent to the aperture.