PISTON PROVIDED TO HYDRAULIC ROTATOR, AND HYDRAULIC ROTATOR

A piston 61 is included in a liquid-pressure rotating device 72 in which a plurality of pistons 61 including the piston 61 are arranged at a cylinder block 9 in a circumferential direction of the cylinder block 9, the cylinder block 9 being configured to rotate together with a rotating shaft 5, the...

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Bibliographische Detailangaben
Hauptverfasser:	SHIRATSUCHI, Toru, TAMASHIMA, Hideki, OTSUDA, Kenta
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BLASTING ENGINE PLANTS IN GENERAL HEATING LIGHTING MACHINES OR ENGINES FOR LIQUIDS MACHINES OR ENGINES IN GENERAL MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENTTYPE, e.g. STEAM ENGINES MECHANICAL ENGINEERING OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS PRODUCING MECHANICAL POWER PUMPS PUMPS FOR LIQUIDS OR ELASTIC FLUIDS STEAM ENGINES WEAPONS WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS
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Beschreibung
Zusammenfassung:	A piston 61 is included in a liquid-pressure rotating device 72 in which a plurality of pistons 61 including the piston 61 are arranged at a cylinder block 9 in a circumferential direction of the cylinder block 9, the cylinder block 9 being configured to rotate together with a rotating shaft 5, the liquid-pressure rotating device 72 being used as a pump or a motor. The piston 61 includes: a cylindrical peripheral wall main body portion 62 including a hollow portion 62b, an opening portion 64 being formed at one end of the peripheral wall main body portion 62 and communicating with the hollow portion 62b; a lid portion 63 welded to an inner peripheral surface of the opening portion 64 to seal the hollow portion 62b and including an outer surface formed as a pressure receiving surface 63 a which receives liquid pressure; and a stress reducing portion 65 provided on an inner peripheral surface of the peripheral wall main body portion 62, the inner peripheral surface being in contact with or close to an end portion 68a of a welded portion 68 formed between the opening portion 64 and the lid portion 63, the end portion being located at the hollow portion 62b side, the stress reducing portion being configured to reduce stress acting on the end portion 68a of the welded portion 68.