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A rotary vane suction pump that includes a housing that defines a pump chamber. A shaft is rotatably mounted to the housing. A rotor is fixed to the front end of the shaft to rotate in unison with the vanes. The vanes that form the fluid cavities, into which the fluid is drawn into and discharged fr

A rotary vane suction pump that includes a housing that defines a pump chamber. A shaft is rotatably mounted to the housing. A rotor is fixed to the front end of the shaft to rotate in unison with the vanes. The vanes that form the fluid cavities, into which the fluid is drawn into and discharged from, are seated in radially directed slots that extend longitudinally, end-to-end along the length of the rotor. Discs located at the opposed inboard and outboard ends of the rotor are mounted to the shaft and rotor to turn in unison with the rotor. The discs have diameters greater than that of the rotor and the pump chamber. The discs thus close the ends of the pump chamber and the ends of the slots in which the vanes are seated.

대표청구항 ▼

What is claimed is: 1. A suction pump comprising: a drive housing having a front end; a shaft rotatably disposed in said drive housing, said shaft having a front face located adjacent the front end of said drive housing; a pump casing disposed over the front end of said drive housing, said pump c

What is claimed is: 1. A suction pump comprising: a drive housing having a front end; a shaft rotatably disposed in said drive housing, said shaft having a front face located adjacent the front end of said drive housing; a pump casing disposed over the front end of said drive housing, said pump casing defining a pump chamber that extends forward from the back face, the pump chamber having a diameter wherein, collectively the front end of said drive housing and said pump casing are shaped to define an inboard disc chamber that surrounds said pump chamber and has a diameter larger than the diameter of the pump chamber; a rotor integrally attached to the front face of said shaft to rotate with said shaft, said rotor positioned in said pump chamber, said rotor having a plurality of circumferentially spaced apart radially directed slots, and a diameter; a plurality of vanes disposed in said pump chamber, each said vane being disposed in a separate one of the slots formed in said rotor; and an inboard disc located between said shaft and said rotor so as to be located against the open end of said slots and secured to said shaft so as to rotate with said shaft and said rotor, said inboard disc having a diameter that is greater than the diameter of said rotor and being disposed in the inboard disc chamber, wherein, said disc is positioned to be spaced away from surfaces of said drive housing and said pump casing that define the inboard disc chamber. 2. The pump of claim 1, wherein said shaft is shaped to have: a stem section located distal to said pump casing, the stem section having a diameter; and a head section located adjacent said pump casing, the head section having a diameter that is greater than the diameter of said stem section and wherein said inboard disc is disposed against the head section. 3. The pump of claim 2, further including a bearing assembly for rotatably holding said shaft in said drive housing, said bearing assembly extending from the head section of said shaft to said drive housing. 4. The pump of claim 1, wherein: said shaft, said rotor and said inboard disc are separate components; and a fastener urges said rotor towards said shaft so that said inboard disc is compression secured between said shaft and said rotor. 5. The pump of claim 4, wherein: said shaft is shaped to have a boss that extends forward from the front face of said shaft; and said rotor and said shaft are seated on said shaft boss. 6. The pump of claim 1, wherein: said pump casing is shaped to define an outboard disc chamber that is located forward of said pump chamber and that has a diameter greater than the diameter of said pump chamber; and an outboard disc is secured to a forward end of said rotor to rotate in unison with said rotor and is located in the outboard disc chamber, wherein said outboard disc has a diameter, the diameter of said outboard disc being greater than the diameter of said rotor and said outboard disc is positioned in said outboard disc chamber to be spaced away from surfaces of said pump casing that define the outboard disc chamber. 7. The pump of claim 1, wherein a liner is disposed in said cap and said liner is formed with an interior wall that defines the pump chamber. 8. The pump of claim 1, wherein said rotor and said liner have the same height. 9. The pump of claim 1, wherein: an inboard housing is disposed in said drive housing; and said shaft is rotatably mounted to said inboard housing. 10. The pump of claim 1, wherein said drive housing and said pump casing are separate components. 11. A suction pump, said suction pump comprising: a housing, said housing shaped to have: first and second ends; an inboard disc chamber in the first end that has a diameter; a pump chamber in the first end that is located outboard of the inboard disc chamber that is in fluid communication with the inboard disc chamber and that has a diameter less than the diameter of the inboard disc chamber; and inlet and outlet ports in the first end that are in fluid communication with the pump chamber; an elongated shaft, said shaft being rotatably fitted in the second end of said housing and having a front end adjacent the first end of said housing; an inboard disc integral with said shaft and located forward of the front of said shaft and the inboard end of said rotor where said inboard disc is disposed in the inboard disc chamber; a rotor located over the outwardly directed face of said inboard disc and being integral with said shaft and said inboard disc to rotate in unison with said shaft and said inboard disc, said rotor having an inboard and an outboard end, a plurality of outwardly directed slots that extend between the ends of said rotor so said inboard disc closes the inboard ends of the slots and said rotor is located in said pump chamber; and a plurality of vanes, each said vane being located in one of the slots of said rotor so as to rotate in the pump chamber with said rotor. 12. The pump of claim 11, wherein said shaft is shaped to have: a stem section located distal to said pump casing, the stem section having a diameter; and a head section located adjacent said pump casing, the head section having a diameter that is greater than the diameter of said stem section and wherein said inboard disc is disposed against the head section. 13. The pump of claim 12, further including a bearing assembly for rotatably holding said shaft in said drive housing, said bearing assembly extending from the head section of said shaft to said housing. 14. The pump of claim 11, wherein: said shaft, said rotor and said inboard disc are separate components; and a fastener urges said rotor towards said shaft so that said inboard disc is compression secured between said shaft and said rotor. 15. The pump of claim 14, wherein: said shaft is shaped to have a boss that extends forward from the front face of said shaft; and said rotor and said shaft are seated on said shaft boss. 16. The pump of claim 11, wherein: said housing is shaped to define an outboard disc chamber that is located forward of said pump chamber and that has a diameter greater than the diameter of said pump chamber; and an outboard disc is integral with the outboard end of said rotor to rotate in unison with said rotor and is located in the outboard disc chamber, wherein said outboard disc has a diameter, the diameter of said outboard disc being greater than the diameter of said rotor, the outboard closes the outboard ends of the slots located in the rotor at the outboard end of said rotor and said outboard disc is positioned in said outboard disc chamber to be spaced away from surfaces of said housing that define the outboard disc chamber. 17. A liquid pressure vane pump comprising: a housing and a pump chamber extending forward from said housing; a shaft and a bearing assembly rotatably supporting said shaft in said housing; a rotor in said pump chamber and rotatably supported by said shaft; said pump chamber having a peripheral wall, said rotor including projectingly movable vanes, said vanes having chamber peripheral wall tracking outer edges, said shaft having a front end face facing forward from said bearing assembly, said rotor being fixed to said shaft for rotation therewith, and located in front of said front end face of said shaft, in which said shaft front end face carries a nose, said rotor having a recess receiving said nose, a fastener extending through said rotor and fixing same with respect to said nose. 18. A liquid pressure vane pump comprising: a housing and a pump chamber extending forward from said housing; a shaft and a bearing assembly rotatably supporting said shaft in said housing; a rotor in said pump chamber and rotatably supported by said shaft; said pump chamber having a peripheral wall, said rotor including projectingly movable vanes, said vanes having chamber peripheral wall tracking outer edges, said shaft having a front end face facing forward from said bearing assembly, said rotor being fixed to said shaft for rotation therewith, and located in front of said front end face of said shaft; a casing bounding said pump chamber and in which said housing includes a front portion behind said casing, said shaft has a front end, a disc fixed between said rotor and shaft front end and rotatable with said shaft, said disc being disposed between said housing front portion and casing an axial shaft position adjuster operatively interposed between said shaft and housing for shifting the axial position of said shaft in said housing assembly, said shaft having a first axial position abutting said disc against said casing and a second axial position rearward of said first axial position and spacing said disc between and from said housing front portion and said casing. 19. A liquid pressure vane pump comprising: a housing and a pump chamber extending forward from said housing; a shaft and a bearing assembly rotatably supporting said shaft in said housing; a rotor in said pump chamber and rotatably supported by said shaft; said pump chamber having a peripheral wall, said rotor including projectingly movable vanes, said vanes having chamber peripheral wall tracking outer edges, said shaft having a front end face facing forward from said bearing assembly, said rotor being fixed to said shaft for rotation therewith, said rotor being located in front of said front end face of said shaft and cantilevered therefrom. 20. The apparatus of claim 19 wherein said housing includes a front bearing assembly, said pump chamber extending forward from said front bearing, said shaft having a motor drivable rear portion and a front portion rotatably supported in said housing assembly by said front bearing assembly, wherein the distance diametrically between opposite sides of said pump chamber peripheral wall approximates the outside diameter of the shaft front portion at said front bearing assembly. 21. The apparatus of claim 19, wherein said bearing assembly comprises a front bearing assembly and including a rear bearing assembly therebehind, said pump chamber extending forward from said front bearing assembly, said rotor having an outer peripheral surface, said rotor having longitudinal slots opening outward through said peripheral surface, said slots having radially inner ends, said rotor having a central portion at said radially inner ends of said slots and from which said slots outwardly extend, said vanes being slidably in said slots and circumferentially along said pump chamber peripheral wall, said rotor being cantilvered forward fron said front bearing assembly, the diameter of said rotor central portion being substantially less than the diameter of said shaft at said front bearing.