Piston apparatus composed of metal piston ring without kerf

#1. Field of the Invention

#The present invention concerns a piston apparatus.

#2. Detailed Description of the Prior Art

#FIG. 1 is a side portion of a piston apparatus having a metal cylindrical piston ring without kerf.

#FIG. 2 is a front view of FIG. 1.

#FIG. 3 is an enlarged side portion of main parts of a slap prevention dish spring ring used for the piston apparatus of the present invention.

#First, the application was made to a piston pump for refrigerator where experiment results can be obtained easily based on FIG. 1 and for the vacuum action of a difficult problem has been obtained outstandingly excellent performances, and a refrigeration unit of extremely low heat generation was obtained. 1 Specifications of experimental refrigeration unit Diameter of metal cylindrical piston ring without kerf 35 mm Width of metal cylindrical piston ring without kerf 25 mm Thickness of metal cylindrical piston ring without kerf 1.2 mm Stroke of piston apparatus 20 mm Rotation speed of refrigeration unit 1500 rpm O-ring is used for slap prevention ring Specification of experimental internal-combustion engine Mitsubishi agricultural Ricardo type single cylinder air-cooling gasoline engine Inside diameter of cylinder 75.15 mm Stroke of piston 65 mm Diameter of metal cylindrical piston ring without kerf 75.05 mm Width of metal cylindrical piston ring without kerf 15 mm Thickness of metal cylindrical piston ring without kerf 1.7 mm Diameter of head of conventional piston body 74.5 mm Diameter or skirt part of conventional piston body 74.9 mm (Conditions of air-tightness test of internal-combustion engine)

#The cylinder head is remove, a cover having a separately prepared O-ring is set on the upper part of the cylinder wall face, and compression pressure test and vacuum pressure test were performed in manual operation. 2 Manually obtained maximum pressure about 12 atmospheric pressures Manually obtained maximum 76 cm Hg vacuum pressure

#Time necessary for reducing from 76 cm Hg to about 50 cm Hg was about 20 min. Thereafter, time until a complete disappearance of vacuum pressure was about 1 hour. A slap prevention ring is not used for skirt part. A readymade piston was modified and used for the piston body.