US 2016/0238016 A1Published application

Fuel pump

AssigneeDenso Corporation

InventorsHiromi SAKAI, Yuuji HIDAKA

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Abstract

An engaging hole-of an impeller, which receives a shaft, is formed by an impeller first planar surface, which is contactable with a shaft first planar surface, an impeller second planar surface, which is contactable with a shaft second planar surface, and an impeller first curves surface-and an impeller second curved surface, which connect between the shaft first planar surface-and the shaft second planar surface. A first groove and a second groove, which are communicated with the engaging hole, are formed in the impeller first curved surface and the impeller second curved surface, respectively. When the shaft first planar surface contacts the impeller first planar surface upon rotation of the shaft in one direction, the first groove is deformed by an applied force. Thereby, the shaft second planar surface and the impeller second planar surface contact with each other.

Claims12

Dependent claims

A fuel pump comprising:

a pump case that includes a suction port, through which fuel is drawn into the pump case, and a discharge port, through which the fuel is discharged from the pump case;
a stator, around which a plurality of windings is wound, wherein the stator is configured into a tubular form and is received in the pump case;
a rotor that is rotatably placed on a radially inner side of the stator;
a shaft that is coaxial with the rotor and rotates integrally with the rotor;
and
an impeller that includes an engaging hole, which receives one end portion of the shaft, wherein:
when the impeller is rotated integrally with the shaft, the impeller pressurizes the fuel drawn through the suction port and discharges the pressurized fuel through the discharge port;
the one end portion of the shaft includes a shaft side first contact surface, which is contactable with the impeller, and a shaft side second contact surface, which is parallel to the shaft side first contact surface and is contactable with the impeller;
the engaging hole includes an impeller side contact surface, which opposes one of the shaft side first contact surface and the shaft side second contact surface and is contactable with the one of the shaft side first contact surface and the shaft side second contact surface;
and
the impeller includes at least one deformation enabling space that is deformed when the one of the shaft side first contact surface and the shaft side second contact surface contact the impeller side contact surface.

8 more elements

Dependencies are inferred from the claim text.