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US 4,538,977 AGranted
Roller vane pump with angular ranges of approximate concentric circular paths for the rollers
AssigneeRobert Bosch GmbH
InventorsKarl Ruhl, Ulrich Kemmner
Life of this patent
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AssigneeRobert Bosch GmbH
InventorsKarl Ruhl, Ulrich Kemmner
Estimating the term…
A fluid supply pump such as a roller cell pump which includes a multiplicity of individual pumping bodies or rollers held in the grooves of a driven rotor in contact with an eccentrically disposed roller path which, in a certain angular range around the narrowest and widest gap, it is, at each location, virtually identical with a concentric circular path which is drawn around the rotor center point, the path preferably formed by two ellipse halves, for the elliptic shape can be virtually exactly approximated around the apex points of the ellipse by means of its primary circles of curvature to thereby improve the dynamic sequence of operations, for example to increase the sealing effect of the radial gap and to adapt the expansion and compression phases to the opening and closing conditions of the intake and pressure grooves.
A supply unit for fluids, in particular a fuel supply pump in the form of a roller cell or vane cell pump which is disposed in a common housing with a driving electromotor comprising, in combination, a driven rotor disc having a plurality of grooves, a plurality of individual pumping rollers disposed in said rotor disc grooves, a roller path formed by two ellipse halves having the same geometrical center Me disposed eccentrically to said disc for contact by said rollers, the major semi-axis of one ellipse half being identical to the minor semi-axis of the other ellipse half, whereby the ellipse shape about the apex points WS and ES of said ellipse halves approximate circular arcs of curvature with centers coinciding with said rotor disc, said roller path within an angular range of .+-.20.degree. about the narrowest and widest gap distances at the apex of said ellipical halves being substantially identical in each area with a concentric circular path about the center of said rotor path.
Dependencies are inferred from the claim text.