POSITIVE DISPLACEMENT PUMP AND THRUST BEARING ASSEMBLY

摘要

A positive displacement pump and thrust bearing assembly having a housi ng defining an internal fluid chamber having front and rear inner walls. A roto r having a front face and a rear face is positioned in the fluid chamber. Each of the faces of the rotor is spaced apart from a corresponding inner wall of the fluid chamber t o define predetermined clearances therebetween. A shaft is connected at a first end t o the rotor to effect rotation thereof. The shaft extends through a bore in the housing. The thrust bearing assembly includes an adjusting collar and a thrust bushing. The adjusting collar is attachable to the shaft and includes a central bore through which the shaft extends. The thrust bushing is secured within the bore of the housing by a locking ring that prevents longitudinal movement of the thrust bushing toward the fluid chamber. The adjusting collar is rotatable with the shaft and is in relative rotatabl e engagement with the thrust bushing. The adjusting collar and the thrust bushing prevent movement of the shaft and the rotor in a direction away from the adjusting sleeve and toward the rear inner wall of the fluid chamber such that the predetermined clearances between the faces of the rotor and the internal walls of the housing are substantial ly uniformly maintained as the rotor rotates.