Patent ID: 6422831
Filing Date: 2002-07-23
Classification: F04B

Abstract:
In a variable displacement piston pump/motor disposed in a cylindrical housing, said cylindrical housing having an opening at one end, said cylindrical housing mounting input/output shafts passing through said cylindrical housing one end opening, an opposite end of said cylindrical housing being covered by a side cover,a cylinder block, an end of said cylinder block facing said shafts, an opposite end of said cylinder block facing an inner surface of said side cover with a valve plate intervening said cylinder block opposite end and said side cover inner surface, a drive pin interposed between and connecting said cylinder block and said shafts, a plurality of concentrically arrayed pistons disposed about said drive pin for providing a rotation output or hydraulic discharge force, said pistons including spherical heads pivotably supported by an end surface of said shaft, and said input/output shaft being pivotably supported in a shaft support cylinder, the shaft support cylinder having a spherical outer surface at an end thereof engaging with a spherical inner surface of the cylindrical housing at said one end of said cylindrical housing, said housing being tiltable on said support cylinder to thereby be pivotable about hydraulic intake/discharge path-forming tubes fixed on lines connecting centers of the spherical heads of said pistons.