Vacuum pump/ air and gas compressor

Abstract

A pump housing for a pump/compressor includes a front portion and a back portion. The front portion includes an opening forming a motor bearing pocket for seating a motor bearing and through which a motor shaft extends towards the back portion, at least one vent hole radially outwardly spaced from the opening for cooling, and a protrusion extending outward from the front portion, wherein the protrusion is configured to locate a motor housing. A pump/compressor includes the described pump housing and a motor. The front portion of the pump housing is configured as a motor endbell, such that the motor does not include a separate front endbell. The pump/compressor further may include a piston assembly having an integral piston and connecting rod member operable within the pump/compressor. Exhaust air is directed through valve porting in the piston and out of a bottom of the connecting rod.

What is claimed is: 
     
         1 . A pump housing comprising:
 a front portion and a back portion, wherein the front portion comprises:   an opening forming a motor bearing pocket for seating a motor bearing and through which a motor shaft extends towards the back portion;   at least one vent hole radially outwardly spaced from the opening for cooling; and   a protrusion extending outward from the front portion, wherein the protrusion is configured to locate a motor housing.   
     
     
         2 . A pump housing according to  claim 1 , wherein the protrusion is a circular protrusion. 
     
     
         3 . A pump housing according to  claim 1 , wherein the opening and the at least one vent hole are provided in the protrusion. 
     
     
         4 . A pump housing according to  claim 1 , wherein the pump housing includes four vent holes that are circumferentially spaced about the opening. 
     
     
         5 . A pump housing according to  claim 1 , wherein the front portion of the housing is configured as a motor endbell. 
     
     
         6 . A pump/compressor comprising:
 a pump housing comprising a front portion and a back portion; and   a motor configured to be coupled to the front portion of the pump housing;   wherein the front portion of the pump housing comprises:   an opening forming a motor bearing pocket for seating a motor bearing and through which the motor shaft extends towards the back portion;   at least one vent hole radially outwardly spaced from the opening for cooling; and   a protrusion extending outward from the front portion, wherein the protrusion is configured to locate a motor housing of the motor.   
     
     
         7 . A pump/compressor according to  claim 6 , wherein the front portion of the housing is configured as a motor endbell, and the motor does not include a separate front endbell. 
     
     
         8 . A pump/compressor according to  claim 6 , wherein the motor includes a bearing seating by the opening in the pump housing. 
     
     
         9 . A pump/compressor according to  claim 6 , wherein the motor includes a shaft that extends through the opening towards the back portion of the pump housing. 
     
     
         10 . A pump/compressor according to  claim 6 , wherein the protrusion is a circular protrusion that locates the motor housing. 
     
     
         11 . A pump/compressor according to  claim 6 , further comprising a pump housing cover, wherein the pump housing cover includes an integral gasket. 
     
     
         12 . A pump/compressor according to  claim 11 , wherein the integral gasket is over molded onto a cover portion of the pump housing cover. 
     
     
         13 . A pump/compressor according to  claim 6 , further comprising first and second cylinders and heads respectively coupled to a top and a bottom portion of the pump housing. 
     
     
         14 . A pump/compressor according to  claim 13 , further comprising first and second integral pumping chambers and heads respectively coupled to the first and second cylinders. 
     
     
         15 . A pump/compressor according to  claim 14 , wherein each of the first and second integral pumping chambers and head includes a cover plate and gasket for sealing a compression chamber in the integral pumping chamber and head. 
     
     
         16 . A pump/compressor according to  6 , further comprising a piston assembly including an integral piston and connecting rod member operable within the pump/compressor. 
     
     
         17 . A pump/compressor according to  claim 16 , wherein the piston assembly further comprises:
 a bearing receiving portion;   a bearing disposed in the bearing receiving portion; and   an eccentric disposed in an eccentric receiving portion of the bearing.   
     
     
         18 . A pump/compressor according to  claim 17 , wherein the eccentric includes an offset opening configured to receive the motor shaft. 
     
     
         19 . A pump/compressor according to  claim 16 , wherein the piston assembly further comprises a piston cup held against the piston by a retainer washer, wherein exhaust air from a top of the washer is directed through valve porting in the piston and out of a bottom of the connecting rod.