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US 8,007,264 B2Granted
Positive displacement pump apparatus and method
AssigneeSPX Corporation
InventorsVan Norman J. Drew, Hagen Curt
Life of this patent
Estimating the term…
Abstract
An improved positive displacement rotary pump apparatus and method is provided. The pump may include a front cover, a rotor body forming a chamber with the front cover, a gear case supporting a pair of hollow drive shafts, and a pair of rotors disposed in the chambers and each detachably mounted to one end of a respective hollow drive shaft via a stud that extends from the rotor through the hollow shaft to a fastener.
Claims17
A pump, comprising:
- a front cover;
- a pump body forming a chamber with the front cover;
- a pair of hollow drive shafts, each drive shaft having a first end and a second end;
- a gear case supporting the pair of hollow drive shafts;
- a pair of mounting studs;
- a pair of fasteners;
- a pair of rotors disposed in the chamber and each detachably mounted to the first end of a respective hollow drive shaft via a respective mounting stud that extends from the rotor through the respective hollow drive shaft to a respective fastener at the second end of the hollow drive shaft;
- and
- an oil pump to circulate oil or other lubricant inside the gear case,
- wherein the oil pump is a reciprocating pump driven by a cam disposed on one of the drive shafts.
7 more elements
A pump, comprising:
- a front cover;
- a pair of drive shafts;
- a pump body forming a chamber with the front cover;
- a gear case supporting the hollow drive shafts;
- a pair of rotors disposed in the chambers, wherein each rotor is driven by a respective drive shaft and each drive shaft is mounted to the gear case by a pair of bearings that rotatably support the shaft in the gear case, with each bearing being located relative to the gear case by a respective locating ring that is axially movable relative to the gear case, so that each bearing is axially adjustable relative to the gear case;
- and
- an oil pump to circulate oil or other lubricant inside the gear case,
- wherein the oil pump is a reciprocating oil pump driven by a cam on one of the drive shafts.
5 more elements
A pump, comprising:
- a front cover;
- a pair of drive shafts;
- a pump body forming a chamber with the front cover;
- a gear case supporting the hollow drive shafts;
- a pair of rotors disposed in the chambers, wherein each rotor is driven by a respective drive shaft and each drive shaft is mounted to the gear case by a pair of tapered bearings to rotatably support the shaft in the gear case, with each bearing being located relative to the gear case by a respective locating ring that is axially movable relative to the gear case, so that an internal clearance of each bearing is adjustable by adjusting the distance between the locating rings, and
- an oil pump to circulate oil or other lubricant inside the gear case,
- wherein the oil pump is a reciprocating oil pump driven by a cam on one of the drive shafts.
4 more elements
Dependencies are inferred from the claim text.