Electromagnetic fuel pump

a fuel pump and electromagnetic technology, applied in the direction of pump components, positive displacement liquid engines, pump parts, etc., can solve the problems of increasing the cost of electromagnetic fuel pumps, achieve excellent fuel delivery efficiency, avoid chip generation, and reduce a number of parts

US20080044301A1Inactive Publication Date: 2008-02-21NIKKI CO LTD
6 Cites 3 Cited by

Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
Publication Date
2008-02-21
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

In a plunger type electromagnetic fuel pump, a cost reduction is achieved by reducing a number of parts in conjunction with a layout of a check valve and making a cleaning step after assembling unnecessary. In an electromagnetic fuel pump (1) which pressure-feeds a fuel from a pressurizing chamber (6) formed on the front side of a plunger (3) by controlling a current application to an electromagnetic coil (5) and repeating generation and elimination of a magnetic force so as to slidably reciprocate the plunger (3) arranged in a cylinder (4), spring retaining members (36) provided with spring guides (361) retaining proximal end sides of return springs (33) urging valve members (32, 32) of check valves (30, 70) forming the pressurizing chamber (6) integrally has fixing structures for fixing them to mounting positions, and are fixed without using the other fixing means.
Need to check novelty before this filing date? Find Prior Art

Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to an electromagnetic fuel pump used for delivering a liquid fuel reserved in a fuel tank to a combustion apparatus, more particularly to a plunger type electromagnetic fuel pump.

[0003] 2. Description of Related Art

[0004] Conventionally, a fuel pump has been employed as a fuel delivery means of a combustion apparatus such as an oil heater, an engine or the like, and as described in Japanese Unexamined Patent Publication No. 5-79452 and Japanese Unexamined Patent Publication No. 2002-39067, there has been generally widely spread a plunger type electromagnetic fuel pump which can achieve a stable fuel delivery and an accurate flow rate control by repeating generation and elimination of a magnetic force to slidably reciprocate a plunger urged by a return spring for pressurizing a fuel in a fuel passage.

[0005] In the plunger type electromagnetic fuel pump, for example, as shown in a longitudinal c...

Examples

Embodiment Construction

[0022]The description will be given below of a best mode for carrying out the present invention with reference to the accompanying drawings.

[0023]FIG. 1 shows a longitudinal cross sectional view of an electromagnetic fuel pump 1, for example, in the case that the present invention is used in a fuel supply system of a gasoline engine. The electromagnetic fuel pump 1 delivers a fuel corresponding to a gasoline reserved in a fuel tank (not shown) so as to supply it to an engine via a fuel piping by an injector, and is called as a so-called cylinder type electromagnetic fuel pump.

[0024]The electromagnetic fuel pump 1 is structured such that an electromagnetic coil 5 is provided around a cylinder 4, and a plunger 3 is slidably arranged in the cylinder 4 so as to be slidable in a horizontal direction in the drawing. A return spring 41 is arranged on a rear end side of the plunger 3 in a compressed state, and urges the plunger 3 toward the downward side, i.e., toward the left in the drawin...