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Fuel pump

A technology for fuel pumps and pump boxes, which is applied to pumps, liquid fuel feeders, liquid fuel engines, etc., and can solve problems such as damage to sliding bearings

Active Publication Date: 2018-08-03
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the wall thickness of the sliding bearing becomes thinner due to the above-mentioned increase in the inner diameter, so there is a possibility of damage to the sliding bearing.

Method used

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  • Fuel pump
  • Fuel pump
  • Fuel pump

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Experimental program
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Effect test

no. 1 Embodiment approach

[0020] The fuel pump 100 according to the first embodiment of the present invention is figure 1 Shown is a positive displacement trochoid pump. Further, the fuel pump 100 is mounted on a vehicle, and is a diesel pump used to pressure-feed fuel used for combustion of an internal combustion engine, that is, light oil having a higher viscosity than gasoline. The fuel pump 100 includes an electric motor 3 housed in an annular pump body 2 , a pump main body 10 , and a side cover 5 protruding outward from the opposite side of the pump main body 10 across the electric motor 3 in the axial direction Da. constituted for the subject.

[0021] In such a fuel pump 100 , the rotary shaft 3 a coupled to the electric motor 3 is rotationally driven by energization from an external circuit via the electrical connector 5 a of the side cover 5 . The external gear 30 and the internal gear 20 of the pump main body 10 are rotated by the driving force of the rotating shaft 3a. Thus, the fuel suck...

no. 2 Embodiment approach

[0066] Such as Figure 6 As shown, the second embodiment of the present invention is a modified example of the first embodiment. About 2nd Embodiment, it demonstrates centering on the point which differs from 1st Embodiment.

[0067] The outer peripheral side stepped portion 256 of the second embodiment is formed on the outer peripheral wall of the sliding bearing 250 similarly to the first embodiment. The outer peripheral side stepped portion 256 is provided on the motor side in the axial direction Da relative to the housing bearing surface 82 .

[0068] Here, the outer peripheral side step portion 256 is configured in a curved shape in which the outer diameter Do increases toward the motor side in a vertical cross section, and has a curved surface 256 a curved in a concave shape.

[0069] According to such second embodiment, since the outer peripheral side stepped portion 256 has the concavely curved curved surface 256a, the stress applied to the outer peripheral side step...

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Abstract

This fuel pump is provided with: an outer gear; an inner gear; a housing that houses both the gears; a rotary shaft (3a) driven to rotate by an electric motor; and a cylindrical sliding bearing (50) that radially bears the rotary shaft (3a) from the outer circumferential side, and radially bears the inner gear from the inner circumferential side. The fuel pump suctions / discharges fuel as a resultof both the gears rotating in response to the rotary shaft (3a) while increasing / decreasing the volume of a gear chamber (40). A casing (80) of the housing has a shaft bearing surface (82) through which the sliding bearing (50) penetrates and which bears the inner gear (20) in a shaft direction (Da) from the side of the motor. The sliding bearing (50) has: an inner circumferential side step section (52) formed into a stepped shape by increasing the inner diameter (Di) on the opposite side of the motor in the shaft direction (Da); and an outer circumferential side step section (56) formed intoa stepped shape by increasing the outer diameter (Do) of the side of the motor in the shaft direction (Da) more than on the shaft bearing surface (82).

Description

[0001] This application claims priority based on Japanese Patent Application No. 2015-244538 filed on December 15, 2015, the entire contents of which are incorporated herein. technical field [0002] The present invention relates to a fuel pump which sucks fuel into a gear housing chamber and then discharges it. Background technique [0003] Conventionally, there is known a fuel pump that sucks fuel into a gear housing chamber and then discharges it. The fuel pump disclosed in Patent Document 1 includes: an external gear having a plurality of internal teeth; an internal gear having a plurality of external teeth meshing eccentrically with respect to the external gear; The gear storage chamber accommodates; the rotating shaft is connected to the driving source and is driven to rotate by the driving source; the cylindrical sliding bearing supports the rotating shaft in the radial direction from the outer peripheral side, and the internal gear in the radial direction from the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C2/10F02M37/08F04C15/00
CPCF02M37/08F04C13/008F04C15/06F04C2210/203F04C2240/54F04C2/102F04C2240/30F04C2/10F04C15/00F04C2240/40F04C2240/50F04C2240/60
Inventor 古桥代司酒井博美早川哲生
Owner DENSO CORP