fuel pump

A fuel pump and fuel technology, which is applied in the direction of fuel injection pump, pump, fuel injection device, etc., can solve problems such as adverse effects of pump efficiency and unbalanced fuel pressure.

Active Publication Date: 2019-01-11
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this structure is applied to a fuel pump, the fuel pressure in the fuel chamber between the recesses is unbalanced due to the difference in the amount of fuel leakage on both sides in the axial direction. Friction, which adversely affects pump efficiency

Method used

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  • fuel pump
  • fuel pump
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] Hereinafter, one embodiment will be described based on the drawings.

[0024] like figure 1 As shown, the fuel pump 100 according to one embodiment is a positive displacement trochoidal pump mounted on a vehicle. The fuel pump 100 includes a pump main body 3 and an electric motor 4 housed in a cylindrical pump body 2 . At the same time, the fuel pump 100 includes a side cover 5 protruding to the outside from the end opposite to the pump main body 3 , sandwiching the electric motor 4 in the pump body 2 in the axial direction. Here, the side cover 5 includes an electrical connector 5a for supplying electricity to the electric motor, and a discharge port 5b for discharging fuel. In such a fuel pump 100 , the electric motor 4 is rotationally driven by energization from an external circuit via the electrical connector 5 a. As a result, the fuel sucked and pressurized by the pump main body 3 by the rotational force of the rotary shaft 4 a of the electric motor 4 is discha...

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PUM

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Abstract

A fuel pump, comprising an internal gear (20), the internal gear (20) has: a sliding surface (25), on both sides of the internal gear (20) in the axial direction, respectively arranged in a ring shape including external teeth (24a) On the outer peripheral part (24) of the pump box (10), it slides with respect to the pump box (10). The fuel chamber (58); the communication hole (27), which communicates between the recesses (26); the inclined portion (29), which communicates with the edge portion of the opening that communicates with the recess (26) in the communication hole (27). In the edge portion (28), the edge portion on the side of the rotation of the internal gear (20) avoids the adjacent parts (28a, 28b, 28c) adjacent to the inner peripheral edge portion (25a) of the sliding surface (25). Set, the more towards the central part of the communication hole (27), the more inclined to the inner side.

Description

[0001] This application is based on Japanese Patent Application No. 2015-6177 filed on January 15, 2015, the entire content of which is incorporated herein. technical field [0002] The present invention relates to a fuel pump that sequentially sucks fuel into each pump chamber and then discharges it. Background technique [0003] Conventionally, Patent Document 1 discloses a pump that can be applied to a fuel pump that sequentially sucks and discharges fuel into a pump chamber. This pump includes: an external gear having a plurality of internal teeth; an internal gear having a plurality of external teeth meshing with the external gear eccentrically in an eccentric direction; and a pump case rotatably accommodating the external gear and the internal gear. The external gear and the internal gear rotate while expanding and contracting the volume of a plurality of pump chambers formed between the two gears, and sequentially suck oil into each pump chamber and then discharge it....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C2/10F02M37/10F04C15/00
CPCF02M37/10F04C2/102F04C11/008F04C15/008F04C15/06F04C2210/203F02M59/12F04C2/10F04C15/00F04C2/084F04C2/086F04C15/0065F04C15/0088F04C2240/30F04C2240/40F04C2240/60
Inventor 酒井博美古桥代司
Owner DENSO CORP
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