US20080044301A1 - Electromagnetic fuel pump - Google Patents

Electromagnetic fuel pump Download PDF

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Publication number
US20080044301A1
US20080044301A1 US11/604,328 US60432806A US2008044301A1 US 20080044301 A1 US20080044301 A1 US 20080044301A1 US 60432806 A US60432806 A US 60432806A US 2008044301 A1 US2008044301 A1 US 2008044301A1
Authority
US
United States
Prior art keywords
plunger
fuel pump
spring
retaining member
cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/604,328
Other languages
English (en)
Inventor
Kousuke Ohnishi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nikki Co Ltd
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Assigned to NIKKI CO., LTD. reassignment NIKKI CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OHNISHI, KOUSUKE
Publication of US20080044301A1 publication Critical patent/US20080044301A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • F04B17/046—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the fluid flowing through the moving part of the motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/12—Valves; Arrangement of valves arranged in or on pistons
    • F04B53/125—Reciprocating valves
    • F04B53/127—Disc valves

Definitions

  • 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.
  • 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.
  • a plunger 3 constituted by a magnetic material and arranged slidably in a cylinder 4 is moved backward on the basis of a magnetomotive force caused by a current application to an electromagnetic coil 5 against an urging force of a return spring 41 , and a check valve 30 provided in a leading end side of the plunger 3 is opened so as to introduce the fuel into a pressurizing chamber 6 formed in a front side of the plunger 3 from an intake port 44 formed in a proximal end of the cylinder 4 .
  • the urging force of the return spring 41 overcomes the magnetic force by reducing or stopping the current to the electromagnetic coil 5 , and the plunger 3 is moved forward, thereby pressurizing the fuel in the pressurizing chamber 6 and a check valve 70 arranged on the downstream side of the pressurizing chamber 6 is opened.
  • the fuel is delivered toward the engine from a discharge port 42 formed in the leading end of the cylinder 4 by repeating the operation mentioned above.
  • the structure is such that the check valve 30 is provided in a leading end side (a discharge side) of a fuel passage 38 passing through the plunger 3 , a valve member 32 , a return spring 33 and a spring guide 34 are inserted, and the spring guide 34 is fixed to the plunger 3 by a fastening clip 35 corresponding to a fixing means having a repulsion force of a spring steel.
  • the check valve 70 having a check valve structure similar to the check valve 30 is provided in the cylinder 4 on the downstream side, and the pressurizing chamber 6 is formed between the check valves 30 and 70 .
  • the spring guide 34 and the fastening clip 35 for fixing the spring guide 34 are formed as separate parts, thereby causing an increase in a number of the parts of the electromagnetic fuel pump.
  • the fastening clip 35 is inserted in the plunger 3 so as to be fixed, when manufacturing the electromagnetic fuel pump 2 , there is a case that an inner peripheral surface of the mounting position of the plunger 3 is scraped by the fastening clip 35 and a chip is generated. Since there is a case that this causes a seat failure of the valve member 32 , a cleaning step for removing the chip after assembling is necessary. Accordingly, these matters cause a cost increase of the electromagnetic fuel pump.
  • the present invention intends to solve the problem mentioned above, and an object of the present invention is to achieve a cost saving by reducing a number of parts relating to a layout of a check valve and making a cleaning step after assembling unnecessary, in a plunger type electromagnetic fuel pump.
  • an electromagnetic fuel pump comprising: a cylinder having a discharge port provided with a check valve and an intake port on a proximal end side thereof; a plunger slidably fitted in the cylinder, the plunger having a fuel passage formed along an axis thereof and provided with a check valve therein on a leading end side thereof; a return spring arranged on the proximal end side between the plunger and the cylinder for urging the plunder in a leading end side direction; and an electromagnetic coil arranged on the outside of the cylinder, a current application to the electromagnetic coil being controlled so as to repeat generation and elimination of a magnetic force to cause the plunger to slidably reciprocate for delivering a fuel under pressure; wherein at least the check valve provided in the plunger has a spring retaining member having a spring guide retaining a discharge side of the return spring urging a valve member thereof in a valve closing direction, and a fixing structure to the discharge port of the plunger or the cylinder.
  • any fastening clip constituted by an independent part is not necessary as the fixing member, so that it is possible to avoid generation of a chip caused by an installation of the fastening clip as well as it is possible to reduce a number of the parts, thereby making a cleaning work after assembling unnecessary.
  • the check valves provided with the spring retaining members are provided at two positions on an upstream side and on a downstream side of the pressurizing chamber, a delivery efficiency of the fuel is excellent and the parts reduction can be achieved at two positions.
  • the fixing structure of the spring retaining member comprises an outer peripheral side extending from the proximal end side of the spring guide in a centrifugal direction with respect to a center axis of the fuel passage, the outer peripheral side of the spring retaining member being fitted in an inner peripheral surface of the mounted position in close contact therewith, the spring retaining member being fixed on the basis of an elastic repulsion force of the fixing structure itself, it is possible to easily form by a comparatively simple structure.
  • the spring retaining member is made of a synthetic resin having an appropriate elasticity, it is easy to have a suitable elastic deformable performance as well as it is easier to form, and it is possible to easily and securely fix without requiring any high-level molding precision.
  • the return spring guide retaining the check valve via the return spring is integrally provided with the fixing structure for fixing it to the mounting position, it is possible to omit the cleaning step after assembling as well as it is possible to reduce the number of the parts necessary in conjunction with the layout of the check valve, and it is possible to easily achieve the cost saving.
  • FIG. 1 is a longitudinal cross sectional view showing an embodiment in accordance with the present invention
  • FIG. 2 is an enlarged partial view of the leading end side of the plunger in FIG. 1 ;
  • FIG. 4 is a longitudinal cross sectional view showing a prior art
  • 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 drawing.
  • the spring retaining member 36 having a spring guide 361 retaining the proximal end side (left side in the drawing) of the return spring 33 integrally has a fixing structure formed by molding of a synthetic resin having an appropriate elasticity and fitted in the mounting position for fixing, and is fitted in the inner peripheral surface of the fuel passage 38 passing through the plunger 3 on the leading end side so as to be fixed, without using any fixing means as a separate part such as the fastening clip or the like as in the prior art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Electromagnetic Pumps, Or The Like (AREA)
  • Fuel-Injection Apparatus (AREA)
US11/604,328 2006-08-18 2006-11-27 Electromagnetic fuel pump Abandoned US20080044301A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006-222891 2006-08-18
JP2006222891A JP2008045507A (ja) 2006-08-18 2006-08-18 電磁燃料ポンプ

Publications (1)

Publication Number Publication Date
US20080044301A1 true US20080044301A1 (en) 2008-02-21

Family

ID=39101562

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/604,328 Abandoned US20080044301A1 (en) 2006-08-18 2006-11-27 Electromagnetic fuel pump

Country Status (2)

Country Link
US (1) US20080044301A1 (ja)
JP (1) JP2008045507A (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102758755A (zh) * 2012-07-27 2012-10-31 徐荣兰 一种电磁式直线活塞泵
US20220001841A1 (en) * 2018-11-28 2022-01-06 Bayerische Motoren Werke Aktiengesellschaft Cleaning Unit

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5346372A (en) * 1991-07-18 1994-09-13 Aisin Seiki Kabushiki Kaisha Fluid flow regulating device
US6662253B1 (en) * 2000-09-13 2003-12-09 Stmicroelectronics, Inc. Shared peripheral architecture
US20040022651A1 (en) * 2000-10-18 2004-02-05 Shogo Hashimoto Electromagnetic drive type plunger pump
US20050080967A1 (en) * 2003-10-14 2005-04-14 Stmicroelectronics Sa Method for arbitrating access to a shared resource
US20050130507A1 (en) * 2003-12-16 2005-06-16 Yokowo Co., Ltd. Spring connector
US6931470B2 (en) * 2002-02-11 2005-08-16 Motorola, Inc. Dual access serial peripheral interface

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4168711B2 (ja) * 2002-09-11 2008-10-22 株式会社アドヴィックス チェックバルブ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5346372A (en) * 1991-07-18 1994-09-13 Aisin Seiki Kabushiki Kaisha Fluid flow regulating device
US6662253B1 (en) * 2000-09-13 2003-12-09 Stmicroelectronics, Inc. Shared peripheral architecture
US20040022651A1 (en) * 2000-10-18 2004-02-05 Shogo Hashimoto Electromagnetic drive type plunger pump
US6931470B2 (en) * 2002-02-11 2005-08-16 Motorola, Inc. Dual access serial peripheral interface
US20050080967A1 (en) * 2003-10-14 2005-04-14 Stmicroelectronics Sa Method for arbitrating access to a shared resource
US20050130507A1 (en) * 2003-12-16 2005-06-16 Yokowo Co., Ltd. Spring connector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102758755A (zh) * 2012-07-27 2012-10-31 徐荣兰 一种电磁式直线活塞泵
US20220001841A1 (en) * 2018-11-28 2022-01-06 Bayerische Motoren Werke Aktiengesellschaft Cleaning Unit

Also Published As

Publication number Publication date
JP2008045507A (ja) 2008-02-28

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Legal Events

Date Code Title Description
AS Assignment

Owner name: NIKKI CO., LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:OHNISHI, KOUSUKE;REEL/FRAME:018897/0019

Effective date: 20070118

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION