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US 3,973,881 AGranted
Vane-type pump or motor with undervane fluid bias
AssigneeDaimler-Benz Aktiengesellschaft
InventorWilhelm Melchinger
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AssigneeDaimler-Benz Aktiengesellschaft
InventorWilhelm Melchinger
Estimating the term…
A vane-pump or motor which includes a rotor equipped with vanes slidable within at least approximately radial slots and with an endless cam surface which surrounds the rotor and together with the same forms a sickle-shaped working space; the cam surface is so shaped that it includes a radially outwardly directed inclination with respect to a circular cam concentric to the center of rotation of the rotor which forms the suction area and in other circumferential areas, it includes a radially inwardly directed inclination, forming the discharge area; two base plates are provided which axially sealingly enclose the rotor together with the vanes and the cam ring and which axially delimit the working space or spaces; internal channels connect the suction or inlet area of the working space with the feed line and the discharge area of the working space with the discharge channel; an unobstructed working medium supply is also provided out of the channel subjected to the higher pressure level which leads to the slot bottoms of the rotor disposed in the suction or inlet area by way of flooding channels while a throttled working medium discharge exists out of the slot bottoms of the vanes disposed in the discharge area which leads to the high pressure side of the installation by way of emptying channels, which includes at least in part a by-pass by way of at least some of the slot bottoms disposed in the suction or inlet area while the flooding channels to these slot bottoms terminate in the slot bottoms in an axial location disposed downstream with respect to the connecting place of the discharge channels as viewed in the flow direction of the working medium discharge.
A vane cell installation for liquid flow media which comprises a rotor means provided with at least approximately radial slot means, vane means slidable within said slot means, an endless cam surface means surrounding the rotor means and radially enclosing together with the rotor means at least one sickle-shaped working space means, the cam surface means having a radially outwardly directed inclination with respect to a circular surface concentric to the center of rotation of the rotor means which forms an inlet area during transversal of the cam surface means in a predetermined direction corresponding to the operating direction, and a corresponding radially inwardly directed inclination in at least one other circumferential area of the cam surface means forming a discharge area, two essentially plane base plate means axially sealingly enclosing on both sides the rotor means together with the vane means and the cam surface means and axially delimiting the working space means, internal connecting channel means connecting the inlet area of the working space means with a feed channel means and connecting the discharge area of the working space means with a discharge channel means, a working medium supply means from a part of the system which is subjected to the higher pressure level, to bottoms of the slot means of the rotor means disposed in the inlet area by way of flooding channel means and a working medium discharge means out of the bottom of the slot means of the rotor means disposed in the discharge area toward the high pressure side of the installation by way of emptying channel means, characterized in that the working medium discharge means takes place exclusively by way of a by-pass means including at least a partial area of the axial extent of the bottoms of the slot means of the rotor means disposed in the inlet area, and in that the flooding channel means to said last-mentioned bottoms of the slot means terminates in said slot bottoms at an axial position thereof disposed downstream with respect to the connecting place of the emptying channel means, as viewed in the flow direction of the working medium discharge.
Dependencies are inferred from the claim text.