Abstract: A vane pump has a rotor and a control slide mounted within an internal chamber of a housing. The rotor has a number of vane mounting openings and vanes. Rotation of the rotor generates a pressure differential between inlet and outlet ports of the pump to draw fluid in and output the fluid out. Both the vane mounting openings and vanes are arranged in pairs that are diametrically opposed to one another with respect to the rotor axis. The vanes in each said pair have an intermediate transfer member extending therebetween that shifts with one vane of each said pair retracting radially inwardly by engagement with the internal surface of the rotor receiving space for extension of the opposing vane of each said pair radially outwardly toward the internal surface of the rotor receiving space. The intermediate transfer member may be a pin provided between the vanes of the pair.

Abstract: An epitrochoidal vacuum pump includes a housing having a chamber, a rotor rotatably received within the internal space of the chamber, and a drive shaft configured to rotate the rotor eccentrically about an axis within the chamber in an epitrochoidal manner. An externally toothed guide sprocket meshes with and guides movement of a guide gear of the rotor as it is driven by the drive shaft. A chamber inlet draws air under negative pressure into the housing, and an outlet is provided to expulse air under positive pressure from the housing. Further, a fluid inlet is provided to input lubricant along the drive shaft and into the internal space of the chamber. The fluid inlet is communicated by channel(s) in an interior of the housing. The lubricant is drawn into the housing via a pressure differential.

Abstract: A pump assembly that has a first pump and a second pump for pumping lubricant, both pumps being integrated into a single housing. A drive shaft is provided that drives both pumps. Both the first pump and the second pump have a gear or rotor that is rotated by the drive shaft. Each of the pumps have an inlet provided on the housing to receive input from a source outside the housing and an outlet. The housing has a wall that is common to both pumps. The first pump is provided on a first side of the wall and the second pump is provided on the second, opposite side. The gears or rotors of the pumps may be provided in pockets provided on the first and second sides of the wall. The drive shaft extends through the wall and connects to each of the drive gears or rotors.

Abstract: An epitrochoidal vacuum pump includes a housing having a chamber, a rotor rotatably received within the internal space of the chamber, and a drive shaft configured to rotate the rotor eccentrically about an axis within the chamber in an epitrochoidal manner. An externally toothed guide sprocket meshes with and guides movement of a guide gear of the rotor as it is driven by the drive shaft. A chamber inlet draws air under negative pressure into the housing, and an outlet is provided to expulse air under positive pressure from the housing. Further, a fluid inlet is provided to input lubricant along the drive shaft and into the internal space of the chamber. The fluid inlet is communicated by channel(s) in an interior of the housing. The lubricant is drawn into the housing via a pressure differential.