Fuel pump

a fuel pump and pump body technology, applied in the direction of pump, positive displacement liquid engine, machine/engine, etc., can solve the problems of terminal damage, difficult fuel discharge from the opening,

Inactive Publication Date: 2012-03-01
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]According to the present invention, there is also provided a fuel pump including a pump part, a motor part, a motor casing, a motor cover, a terminal, and an electric connector part. The pump part includes a rotation member configured to suction and pressurize fuel. The motor part includes a rotor coupled with a rotating shaft of the rotation member to be capable of rotating the rotation member, a commutator rotated together with the rotor to rectify an electric current supplied to the rotor, and a housing accommodating the rotor and the commutator. The motor casing supports one end of the rotating shaft of the rotation member. The motor cover is disposed at one end of the motor part in an axial direction thereof and is fitted together with the housing so as to fix the motor casing. The terminal is disposed at an end portion of the motor cover located on an opposite side from a fitted end of the motor cover, which is fitted with the housing. The terminal is electrically connectable to an external connector for electricity supply. The electric connector part is disposed at the end portion of the motor cover located on the opposite side from the fitted end of the motor cover, and includes a side surface which is slidably in contact with the external connector to determine a fitting position of the electric connector part relative to the external connector, a bottom face from which the terminal rises up, and an opening which is formed on the side surface to communicate between inside and outside of the electric connector part. The bottom face includes a groove in a direction from generally a center of the motor cover toward the opening, the groove connecting to the opening.

Problems solved by technology

However, if fuel remains away from the opening, or if the residual fuel becomes high-viscosity liquid as a result of the evaporation of its volatile matter content, the discharge of fuel from the opening becomes difficult, and they remain inside the electric connector part.
Particularly, because the liquid, whose impure substance has been condensed due to the evaporation of volatile matter content, exhibits high conductivity, the terminal corrodes by a leak current between both poles, and eventually damage of the terminal is caused.

Method used

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first embodiment

[0023]A fuel pump 10 of a first embodiment of the invention is illustrated in FIG. 1. This fuel pump 10 is an in-tank pump that is disposed in a fuel tank (not shown) of a vehicle. The fuel pump 10 supplies fuel inside the fuel tank to an engine. The fuel pump 10 includes a pump part 12 that pressurizes the suctioned fuel, and a motor part 14 that drives the pump part 12. The motor part 14 is a direct-current motor with a brush. The fuel pump 10 includes a housing 16 having a generally cylindrical shape. A permanent magnet 18 is disposed annularly in the circumferential direction on an inner wall surface of the housing 16. A rotor 20 is disposed radially inward of the permanent magnet 18 concentrically with the annular permanent magnet 18.

[0024]The pump part 12 includes a casing main body 31, a casing cover 32, and an impeller 33 which is a rotation member. The casing main body 31 and the casing cover 32 define a generally C-shaped pump passage 34. The impeller 33 is accommodated ro...

second embodiment

[0039]A second embodiment of the invention will be described with reference to FIGS. 5A to 7. The second embodiment is different from the first embodiment in part of a shape of a communication part bottom face that defines a communication part, which communicates with a terminal part of an electric connector part. The same numerals are used for indicating substantially the same components as the first embodiment, and their descriptions are omitted. In the second embodiment, communication part bottom faces 64, 66 defining communication parts 63, 65 include grooves respectively. Specifically, as illustrated in FIG. 7, V-shaped grooves are formed on the communication part bottom faces 64, 66 such that their recessed ridgelines 643, 663 are located in a downward direction. The communication part bottom faces 64, 66 respectively include two bottom faces, i.e., communication part center side bottom faces 641, 661 that are formed on a terminal part 51-side of the recessed ridgelines 643, 6...

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Abstract

A fuel pump includes a pump part, a motor part, a motor casing, a motor cover, a terminal, and an electric connector part. The terminal is electrically connectable to an external connector for electricity supply. The electric connector part is disposed at an end portion of the motor cover located on the opposite side from a fitted end of the motor cover which is fitted with a housing, and includes a side surface which is slidably in contact with the external connector to determine a fitting position of the electric connector part relative to the external connector, a bottom face from which the terminal rises up, and an opening which is formed on the side surface to communicate between inside and outside of the electric connector part. The bottom face is an inclined surface whose height becomes lower in a direction from generally a center of the motor cover toward the opening.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is based on and incorporates herein by reference Japanese Patent Application No. 2010-194456 filed on Aug. 31, 2010.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a fuel pump that drives its pump part by driving force of its motor part to suction and pressurize fuel.[0004]2. Description of Related Art[0005]A fuel pump that supplies fuel to an internal combustion engine is known. The fuel pump pressurizes fuel suctioned from a fuel tank by its pump part, and supplies the fuel to the engine. In the fuel pump, an electric current supplied via its electric connector part flows through a coil, so that a rotor, around which the coil is wound, rotates to drive the pump part. In JP-A-2008-243569, by changing a shape of a resin member that supports a terminal of an electric connector part, a corrosion or short circuit of the terminal which is caused due to the residue of fuel inside...

Claims

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Application Information

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IPC IPC(8): F04B35/04
CPCF02M37/048H02K5/225H02K5/148H02K5/12
InventorASAI, RIHITOWAKAMATSU, YOSHITAKAKOYAMA, HIDEKIITO, MOTOYAYAURA, TOSHITAKE
OwnerDENSO CORP