Vacuum producing rotary vane pump with shaft lubrication
AssigneeVolkswagenwerk Aktiengesellschaft
InventorsPeter Buchholz, Rolf Warnecke, Alfred Beier
Life of this patent
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Abstract
A rotary vacuum pump is provided with a housing having a cylindrical chamber. A rotor having a plurality of slideably mounted vanes is mounted within the chamber by a shaft extending through an eccentric bore. Hydraulic oil delivered to the rotor under pressure urges the vanes against the chamber walls. Escaping oil lubricates and seals the vanes and also lubricate the rotor shaft.
Claims16
A rotary pump for producing vacuum pressure comprising an integral housing including a cast member having a cylindrical chamber, a rotor in said chamber having a case-hardened cylindrical shaft pivoted without bearing members in a bore in said cast member parallel and eccentric to said chamber, said rotor having a plurality of vanes mounted slideably in outwardly extending slots of the rotor and resting against the cylindrical walls of said chambers and forming variable volume pump chambers, said vanes being urged against said walls by the pressure of hydraulic oil supplied to said slots behind each of said vanes, a part of said hydraulic oil escaping into said cylindrical chamber and promoting sealing between said vanes and the walls of each cylindrical chamber, and an axially extending groove in said housing along said bore and opening into said cylindrical chamber for the flow off of said escaped oil and for providing said oil to said shaft, wherein said rotor and said vanes have approximately the same axial length as said cylindrical chamber, wherein said housing is provided with a cover axially bounding and sealing said pump chambers from each other, said cover being provided with a suction opening, communicating with one of said pump chambers, and wherein said rotor is provided with a blind hole at its end adjacent said cover, said blind hole permanently communicating with all of said slots and with an oil delivery opening.
A rotary pump for producing vacuum pressure comprising an integral housing including a cast member having a cylindrical chamber, a rotor in said chamber having a case hardened cylindrical shaft pivoted without bearing members in a bore in said cast member parallel and eccentric to said chamber, said rotor having a plurality of vanes mounted slideably in outwardly extending slots of the rotor and resting against the cylindrical walls of said chamber and forming variable volume pumps chambers, and vanes being urged against said walls by the pressure of hydraulic oil supplied to said slots behind each of said vanes, a part of said hydraulic oil escaping into said cylindrical chamber and promoting sealing between said vanes and the walls of said cylindrical chamber, a passage for removal of said escaped oil from said chamber and a pocket-shaped depression at one end of said cylindrical chamber communicating with said bore, for providing said oil to said shaft wherein said rotor and said vanes have approximately the same radial length as said cylindrical chamber, wherein said housing is provided with a cover axially bounding and sealing said pump chambers from each other, said cover being provided with a suction opening communicating with one of said pump chambers and wherein said rotor is provided with a blind hole at its end adjacent said cover, said blind hole permanently communicating with all of said slots and with an oil delivery opening.
Dependencies are inferred from the claim text.