Electric fuel pump device

Patent · Tue May 06 04:00:00 EDT 1986

OSTI ID:5543101

Wantanabe, K; Hattori, Y; Matsui, K; Takei, T; Nakamura, T; Ohnishi, S

An electric fuel pump is described having a regeneratve pump section and an electric motor section for driving the regenerative pump section. The regenerative pump section includes: a pump casing having a suction and a discharge port; a first inner surface and a second inner surface which are opposing to each other and spaced axially from each other to form therebetween a pump chamber; a substantially annular pump passage surrounding the first and second inner surfaces and connected at its ends with the suction and discharge ports, respectively; and an impeller accommodated by the pump chamber and mounted on a rotor shaft for rotation as unit therewith but axially movably relatively thereto, the impeller having one axial end surface opposing to the first inner surface of the pump casing with a first gap left therebetween and another axial end surface opposing to the second inner surface of the pump casing with a second gap left therebetween, the first inner surface and the second inner surface of the pump casing being provided with at least one axial thrust force generating surface which is so shaped as to gradually decrease the first gap and the second gap towards the downstream sides as viewed in a direction of flow of fuel introduced into the gaps, respectively, one end of the axial thrust force generating sufface terminating at the pump passage adjacent to the discharge port, so that the fuel may flow from the pump passage in a direction to the suction port along the axial thrust force generating surface thereby to minimize the chance of contact between the impeller and the first inner surface and the second inner surface of the pump casing during a running of the impeller.

• Assignee: Nippondenso Co., Ltd., Kariya
• Patent Number(s): US 4586877
• OSTI ID: 5543101
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330603* -- Vehicle Design Factors-- Engine System
DESIGN
ELECTRIC MOTORS
ENGINES
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
MACHINE PARTS
MOTION
MOTORS
PUMPS
REGENERATION
ROTATION
ROTORS
SHAFTS
SPACE DEPENDENCE
VEHICLES