The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 19, 2000
Filed:
Aug. 10, 1999
Charles H Tuckey, Sand Point, MI (US);
Edward J Talaski, Caro, MI (US);
Walbro Corporation, Cass City, MI (US);
Abstract
A lateral channel fuel pump with a stator having a pumping channel and a second channel each of which cooperates with vanes in a rotor driven to rotate by an electric motor to generate pressure within both the pumping channel and the second channel. The second channel and preferably cavities communicating with it are disposed so that the fuel pressure generated within the channel and any cavities produces forces which, when combined with the forces generated in the pumping channel, provide net forces which are substantially equal or uniform across the lower face of the rotor so that the forces produced by outlet fuel acting across the upper face of the rotor do not tend to cock or tilt the rotor relative to the stator. Further, the second channel and any cavities increase the total force acting upwardly on the lower face to reduce the magnitude of the net force on the rotor urging the rotor towards the stator and hence, to reduce the frictional forces between the rotor and stator. Alternatively, the pump may have dual pumping channels about 180.degree. out of phase with each other to balance the forces across the rotor. Reducing the frictional forces between the rotor and the stator and balancing the forces across the rotor so that it is not cocked or tilted relative to the stator increases the efficiency of the pump, decreases the wear between the rotor and the stator to increase the life of the fuel pump, and increases the output capacity and pressure generated by the pump.