Patent ID: 6792968
Filing Date: 2004-09-21
Classification: F02M,F04B,Y10T

Abstract:
A pump assembly including a body; a piston pump in the body; said pump including a piston bore in the body, the bore having an outer end at a side of the body; a piston in the bore; an eccentric; a drive connection between the eccentric and the piston so that rotation of the eccentric moves the piston along pumping and return strokes in the bore, said bore and piston defining a variable volume pumping chamber; a pumping chamber inlet valve; a plug assembly closing the outer end of the piston bore, the plug assembly including a sleeve having an outer end and an inner end, the inner end of the sleeve having a tapered interior wall, the sleeve located in the outer end of the bore so that the sleeve inner end and tapered inner wall are within the piston bore and the sleeve has a tight fit in the piston bore; a tapered surface on the inner wall of the inner end of the sleeve; a valve seat having a tapered outer wall engaging the sleeve tapered surface to form an interference fit between the seat and the sleeve whereby the sleeve is deformed against the wall of the bore; a poppet member engaging a side of the valve seat away from the pumping chamber; a spring biasing the poppet member toward the seat; a plug driven into the sleeve and into the piston bore to form a joint between the plug and sleeve and strengthen the joint between the sleeve and the wall of the piston bore; an opening in the sleeve between the seat and the plug; and a high-pressure outlet passage in the body communicating with the opening in the sleeve.