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US 5,129,797 AGranted
Equal velocity universal joint and axial piston pump motor device using the joint
AssigneeHitachi, Ltd.
InventorHisanobu Kanamaru
Life of this patent
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AssigneeHitachi, Ltd.
InventorHisanobu Kanamaru
Estimating the term…
An equal velocity universal joint is suitable for coupling shafts, driving and driven shafts, of mutual machines and for use in an axial piston pump motor device. One ends driving pins of the equal velocity universal joint rotate along a predetermined locus on a concentric circle while rotating and sliding by themselves in the cylinder bores of the driving or driven shaft. Spherical head portions of the other ends perform rotating motion in cylinder bores or ball receiving bores of the driving or driven shaft. Accordingly, the respective drving pins continue linear sliding motion in response to the rotation of the driving or driven shaft and thereby the spherical head portions of the other ends are held at the concentric circle on the driving or driven shaft so as to keep the driving center in floating state. As a result, the respective pistons are driven on a concentric circle, thereby an equal velocity universal joint is realized and the mechanical vibration thereof is substantially eliminated.
An axial piston pump-motor device comprising a cylinder barrel accommodated in a housing and rotating in unison with a driving shaft, a plurality of piston units accommodated in said cylinder barrel along an outer concentric circle thereon, an inclined turn plate fixed on a side face of said housing, a piston support rotatably received on said inclined turn plate, one ends of pistons of said piston units being held in respective cylinder bores formed in said cylinder barrel while permitting free rotation and axial movement thereof, and the other ends thereof having spherical head portions that are held on the end face of said piston support while permitting free rotation thereof, and a plurality of driving pins disposed between said cylinder barrel and said piston support and mechanically coupling the same, said driving pins being arranged on an inner concentric circle on said cylinder barrel wherein said one ends of the driving pins are columnar bodies which are inserted into respective bores formed in said cylindrical barrel via compression means while permitting free rotation and axial movement thereof and the other ends thereof having spherical head portions that are held on the end face of said piston support while permitting free rotation and axial movement thereof.
An axial piston pump-motor device comprising a cylinder barrel arranged with a predetermined inclined turn angle with respect to a driving shaft and rotated in synchronism with the rotation of said driving shaft, a plurality of piston units accommodated in said cylinder barrel along an outer concentric circle thereon, a piston support formed at the end of said driving shaft, one ends of pistons of said piston units are held in respective cylinder bores formed in said cylinder barrel while permitting free rotation and axial movement thereof and the other ends thereof having spherical head portions which are held on the end face of said piston support while permitting free rotation thereof, and a plurality of driving pins which are arranged on an inner concentric circle on said cylinder barrel, one ends of said driving pins are columnar bodies and inserted into respective cylinder bores formed in said cylinder barrel via compression means while permitting free rotation and axial movement thereof and the other ends thereof having spherical head portions are held on the end face of said piston support while permitting free rotation and axial movement thereof.
An equal velocity universal joint comprising driving pins disposed between a driving shaft and a driven shaft and mechanically coupling the shaft, said pair of driving shaft and driven shaft are formed of cylindrical bores located at the corresponding commom circles with an equal distance and extending parallel to their axes, and the respective driving pins have columnar body portions inserted and disposed in the cylindrical bores of one of said driving shaft and driven shaft via compression springs and spherical head portions formed at one ends of said columnar body portions are inserted and disposed in the cylindrical bores of the other shaft via compression springs.
An equal velocity universal joint comprising driving pins disposed between a driving member and a driven member and mechanically coupling the members, said pair of driving member and driven member are coupled by said plurality of driving pins arranged at a concentric circle on the facing surfaces of the members, one ends of said driving pins are slidably supported and the other ends thereof are supported so as to permit motion through spherical head portions thereof and slidable motion, and further comprising stopper means at the center of the members so as to limit the axial movement thereof.
An equal velocity universal joint comprising driving pins disposed between a driving member and a driven member and mechanically coupling the members, wherein said pair of driving member and driven member are coupled by a plurality of said driving pins arranged at a concentric circle thereof, one ends of the driving pins are slidably supported and the other ends thereof are supported so as to permit motion through spherical head portions of the driving pins and slidable motion, wherein said one ends of the driving pins are columnar bodies which are inserted into respective cylindrical bores formed in said driving member via compression means.
Dependencies are inferred from the claim text.