Walbro Corporation

Ti Group Automotive Systems Corporation

Wayne T Lipinski

Charles H Tuckey

Kirk D Fournier

George H Bucci

Daniel A Gilmour

Joseph M Ross

David E Mroczka

A fluid pump includes a motor, an inner gear rotor and an outer gear rotor. The inner gear rotor is driven for rotation about an axis by the motor and has a plurality of outwardly extending teeth. The outer gear rotor has a plurality of inwardly extending teeth that are engaged by the teeth of the inner gear rotor so that the outer gear rotor is driven for rotation about a second axis when the inner gear rotor rotates. At least one of the inner gear rotor and the outer gear rotor is formed from a plastic material.

Positive displacement fluid pump

An engine fuel delivery system and method, and for use therein, an in-tank fuel pump and reservoir canister module assembly having a primary fuel filter mounted in a base subassembly adjacent the bottom of the tank and defining a filter chamber in the base having an outlet connected to the inlet of an electric fuel pump received directly in the tank exteriorly alongside of an upright open top reserve fuel canister. The pump outlet is connected to a bypass pressure regulator which discharges fuel in excess of engine demand into the canister. The canister has a bottom outlet mounted on the base subassembly and closed by a flow controlling valve and/or by a restricted orifice communicating the canister outlet with the filter chamber for returning bypassed reserve fuel from the canister reservoir to the pump inlet, either continuously and/or when a low level supply of fuel in the tank to the primary filter is interrupted, such as during cornering or going up or down a steep hill or incline. The valve is formed integrally on or mounted in contact with a secondary filter diaphragm base mounted between the canister outlet and filter chamber and also communicating with the tank. The valve opens with canister outflow downwardly against the bias of a coil spring in response to pump suction acting on a capillary seal formed on the diaphragm filter material to thereby allow reserve fuel to wash over and flow through it into the filter chamber. At system shut-down a filter backwash flow can occur from the canister reservoir.

In-tank fuel pump and reservoir

An in-tank fuel pump and reservoir canister module having a fuel filter mounted in the module base adjacent the bottom of the tank and defining a filter chamber having an outlet connected to the inlet of an electric fuel pump received directly in the tank exteriorly alongside of an upright overflow-type reserve fuel canister. A canister bottom outlet is closed by a flow controlling valve and/or by an always-open restricted orifice communicating with the filter chamber for returning engine bypassed reserve fuel from the canister reservoir to the pump inlet, either continuously and/or only when a low level supply of fuel in the tank to the filter is interrupted. The valve is operated by a diaphragm portion of the filter, base-mounted between the canister outlet and filter chamber and also communicating directly with the tank, the valve opening against the bias of a coil spring in response to pump suction acting on a capillary seal formed on the diaphragm filter to thereby allow reserve fuel to flow into the filter chamber. At system shut-down a filter backwash flow can occur from the canister reservoir. The pump rotary vane impeller chamber has an internal vapor purging passageway communicating at its outlet directly with the interior of the tank so as not to be subjected to any anti-purging gravity pressure head differential existing between the fuel level in the canister reservoir versus that of the main body of fuel in the tank.

Growing community of inventors

Essexville, MI, United States of America

Wayne T Lipinski