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US 5,628,626 AGranted
Hydraulic Machine
AssigneeDanfoss A/S
InventorGunnar L. Hansen
Life of this patent
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AssigneeDanfoss A/S
InventorGunnar L. Hansen
Estimating the term…
A hydraulic machine is disclosed, with a gearwheel, which has a midpoint (6) and a predetermined number of external teeth, and an annular gear, which has a midpoint (7) offset by an eccentricity (E) with respect to the midpoint (6) of the gearwheel and a number of internal teeth which exceeds by one the number of external teeth, the gearwheel and annular gear orbiting and/or rotating relative to one another and at least the form of the external teeth being created using a set of circles (30, 30'; 35, 35') lying with their midpoints (P1-P6; P1'-P6') on a trochoid (36, 37). It is desirable for the efficiency, service life and noise properties of such a machine to be improved. To that end, at least two trochoids (36, 37), displaced relative to one another in the circumferential direction, are provided for generating a tooth profile, the rolling circles (28, 33) of which and the base circles (27, 32) of which differ from one another.
In a hydraulic machine with a gearwheel having a midpoint and a predetermined number of external teeth with tooth tips and tooth flanks separated by tooth spaces, and an annular gear having a midpoint offset by an eccentricity with respect to the midpoint of the gearwheel and having a number of internal teeth with tooth tips and tooth flanks separated by tooth spaces which exceed by one the number of said external teeth, the gearwheel and annular gear orbiting or rotating relative to one another and at least the external teeth being created from a form using a set of circles lying with their midpoints on a trochoid, the improvement comprising at least two trochoids, displaced relative to one another in a circumferential direction, for generating a tooth profile, each trochoid being formed by a rolling circle and a base circle, the rolling circles of the trochoids and the base circles of the trochoids differing from one another.
Dependencies are inferred from the claim text.