Fuel pump

Patent metadata

Field	Value
Publication number	US-2016201679-A1
Application number	US-201414912485-A
Country	US
Kind code	A1
Filing date	Sep 3, 2014
Priority date	Sep 17, 2013
Publication date	Jul 14, 2016
Grant date	—

Abstract

Partitioned chambers of an electric connector, which receive connection terminals electrically connected to windings of a stator, are communicated with an outside of the electric connector through primary communication holes. The primary communication holes are formed to direct at least one of perpendicular directions, each of which is perpendicular to a corresponding one of opening planes of outside openings of the primary communication holes, toward a downside when a central axis of a fuel pump is tilted relative to a vertical direction. In this way, a foreign object, which is accumulated in any of the portioned chambers, can be outputted to the outside through the primary communication hole even when the fuel pump is tilted in any direction.

First claim

1 . A fuel pump comprising:
a pump case that includes a suction port, through which fuel is drawn into an inside of the pump case, and a discharge port, through which the fuel is discharged to an outside of the pump case; a stator, around which a plurality of windings ( 161 , 163 ) is wound, wherein the stator is configured into a tubular form and is received in the inside of 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 is provided to one end portion of the shaft, wherein when the impeller is rotated together with the shaft, the impeller pressurizes the fuel drawn through the suction port and discharges the pressurized fuel through the discharge port; and an electric connector that is provided to the pump case and includes:
a receiving chamber, which receives a plurality of connection terminals that receive an electric power to be supplied to the plurality of windings; and
a plurality of primary communication holes, each of which communicates between an inside and an outside of the receiving chamber, wherein:
the plurality of primary communication holes is formed to direct at least one of perpendicular directions, each of which is perpendicular to a corresponding one of opening planes of outside openings of the plurality of primary communication holes, toward a downside when a central axis of the pump case is tilted relative to a vertical direction.

2 . The fuel pump according to claim 1 , wherein the plurality of primary communication holes is formed at a downside portion of the electric connector.

3 . The fuel pump according to claim 1 , wherein a downside bottom wall of the receiving chamber is formed to decline from an upside to the downside from a location of each of the plurality of connection terminals toward at least one of the plurality of primary communication holes.

4 . The fuel pump according to claim 1 , wherein a plurality of side walls, which form at least two of the plurality of primary communication holes, is formed to be parallel to each other.

5 . The fuel pump according to claim 1 , wherein:
the electric connector includes at least one partition wall, which partitions the receiving chamber into a plurality of partitioned chambers; and the at least one partition wall includes a secondary communication hole, which communicates between corresponding adjacent two of the plurality of partitioned chambers.

6 . The fuel pump according to claim 1 , wherein at least one of the plurality of primary communication holes opens inwardly in a radial direction toward the central axis of the pump case, and at least another one of the plurality of primary communication holes opens outwardly in the radial direction away from the central axis of the pump case.

Assignees

• Denso Corp

Inventors

• Ootake Masaya
• Hayakawa Tetsuo
• Nagata Kiyoshi

Classifications

• F04D13/06 Primary

  the pump being electrically driven · CPC title

• F04D29/528

  especially adapted for liquid pumps · CPC title

• F04D3/00

  Axial-flow pumps (priming or boosting F04D9/00) · CPC title

• F02M2037/082

  Details of the entry of the current supply lines into the pump housing, e.g. wire connectors, grommets, plugs or sockets · CPC title

• F05D2260/602

  Drainage · CPC title