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A piston-type fluid displacement apparatus includes a housing enclosing a crank chamber, a suction chamber, a suction chamber, and a discharge chamber. The housing includes a cylinder block wherein a plurality of cylinder bores formed, a drive shaft rotatably supported in the cylinder block and a pl

A piston-type fluid displacement apparatus includes a housing enclosing a crank chamber, a suction chamber, a suction chamber, and a discharge chamber. The housing includes a cylinder block wherein a plurality of cylinder bores formed, a drive shaft rotatably supported in the cylinder block and a plurality of pistons each of which is slidably disposed within one of the cylinder bores. Each of the pistons includes a cylindrical body and an arm portion axially extending from a first axial end of the cylindrical body and a pair of engaging portions formed the first axial end of the cylindrical body and the arm portion. The cylindrical body of the pistons includes an hollow portion therein. The housing further includes a plate having an angle of tilt and titably connected to the drive shaft and bearing coupling devices coupling the plate to each of the pistons, so that the pistons reciprocates within the cylinder bores upon rotation of the plate. A plurality of apertures are formed on the first axial end of the cylindrical body of the piston and fluidly communicated with the hollow portion of the piston. At least two of the apertures have respectively a rectangular shape.

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[ What is claimed is:] [1.] A piston-type fluid displacement apparatus comprising:a housing enclosing a crank chamber, a suction chamber, and a discharge chamber, said housing including a cylinder block wherein a plurality of cylinder bores are formed:a drive shaft rotatably supported in said cylind

[ What is claimed is:] [1.] A piston-type fluid displacement apparatus comprising:a housing enclosing a crank chamber, a suction chamber, and a discharge chamber, said housing including a cylinder block wherein a plurality of cylinder bores are formed:a drive shaft rotatably supported in said cylinder block;a plurality of pistons, each said pistons slidably disposed within one of said cylinder bores, each of said pistons includinga cylindrical body and an arm portion axially extending from a first axial end of said cylindrical body, anda pair of engaging portions formed said first axial end of said cylindrical body and said arm portion, said cylindrical body of said pistons including an hollow portion therein;a plate having an angle of tilt and tiltably connected to said drive shaft;a bearing coupling said plate to each of said pistons, such that said pistons reciprocates within said cylinder bores upon rotation of said plate; andat least two apertures formed on said first axial end of said cylindrical body of said piston and fluidly communicates with said hollow portion of said piston, said at least two apertures have a rectangular shape and radially extend along said cylindrical body of said piston.