EP0006769B1 - Electromagnetic valve and its use as a fuel injector valve - Google Patents

Electromagnetic valve and its use as a fuel injector valve Download PDF

Info

Publication number
EP0006769B1
EP0006769B1 EP19790301297 EP79301297A EP0006769B1 EP 0006769 B1 EP0006769 B1 EP 0006769B1 EP 19790301297 EP19790301297 EP 19790301297 EP 79301297 A EP79301297 A EP 79301297A EP 0006769 B1 EP0006769 B1 EP 0006769B1
Authority
EP
European Patent Office
Prior art keywords
valve
magnetic pole
pole member
valve seat
main magnetic
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.)
Expired
Application number
EP19790301297
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0006769A1 (en
Inventor
Masaaki Saito
Hirotsugu Yamaguchi
Shinsaku Hirai
Satoru Edo
Yoshihiro Yamashita
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.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Publication of EP0006769A1 publication Critical patent/EP0006769A1/en
Application granted granted Critical
Publication of EP0006769B1 publication Critical patent/EP0006769B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/14—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel having cyclically-operated valves connecting injection nozzles to a source of fuel under pressure during the injection period
    • F02M69/145—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel having cyclically-operated valves connecting injection nozzles to a source of fuel under pressure during the injection period the valves being actuated electrically

Definitions

  • This invention relates to an electromagnetic valve for controlling the amount of a fluid flow, and more particularly to an improvement of such an electromagnetic valve for controlling the amount of fuel flow supplied to an internal combustion engine used in automotive vehicle.
  • a fuel injector of the fuel injection system is provided with an electromagnetic valve continuously repeating the opening and closing operation to control the flow amount of the fuel to be injected.
  • an electromagnetic valve is composed of a valve member which is elongate in its direction of movement and slidable in an elongate guide member, and requires to be produced by high precision machining, for the purpose of maintaining an adequate fluid seal between the valve member and the guide member.
  • an electromagnetic valve of the type wherein a spherical valve member seatable on a valve seat is used to control the flow amount of fuel supplied to an engine.
  • the electromagnetic valve of this type has a significant advantage in that an adequate fluid seal can be maintained even if the valve seat is produced by press working. Therefore, such an electromagnetic valve does not require high precision machining and accordingly is advantageous in this regard as compared with the electromagnetic valve of the type using the elongate valve member slidably disposed in the elongate guide member.
  • Fig. 4 shows a known electromagnetic valve 50, for the purpose of comparing with that in accordance with the present invention.
  • a spherical valve member 52 disposed in a fluid chamber F 3 is biased by a spring 56 disposed at a central bore (no numeral) of a main magnetic pole 58, so that the valve member 52 can effectively be seated on a valve seat member 54.
  • a spring 56 disposed at a central bore (no numeral) of a main magnetic pole 58, so that the valve member 52 can effectively be seated on a valve seat member 54.
  • a side magnetic pole 64 is located spaced from the spherical valve member 52 and beyond the valve seat member 54. Accordingly, a magnetic field formed between the main magnetic pole 58 and the side magnetic pole 64 cannot effectively act on the spherical valve member 52 since the magnetic force of the main magnetic pole 58 is concentrated on the side magnetic pole 64 as indicaterd by the lines b of magnetic force in Fig. 4.
  • the electromagnetic valve of this type encounters the problem discussed in Background of the Invention due to the fact that the spherical valve member 52 is biased downward also by the action of the biasing force of the spring 56, in addition to the above-mentioned problem due to the location of the side magnetic pole 64.
  • DD-A-97026 discloses an electromagnetic valve comprising a fluid chamber into which a fluid is admitted, a magnetic spherical valve member disposed and movable within said fluid chamber, a valve seat member on which the spherical valve member is seatable, the fluid within the fluid chamber being dischargeable out of the electromagnetic valve through a clearance formed between the valve seat member and the spherical valve member, a main magnetic pole member disposed opposite the valve seat member and in close proximity to the spherical valve member, the spherical valve member being able to be attracted to the main magnetic pole members, a side member disposed around and in close proximity to the spherical valve member, this side member being spaced from and between the level of the extreme end of the main magnetic pole member and the level of the extreme end of the valve seat member.
  • DE-A-2 300 458 discloses an electromagnetic valve comprising a fluid chamber, a magnetic spherical valve member, a main magnetic pole member and a non-magnetic valve seat member, provisions being made in a magnetic member to guide the spherical valve member during its movements.
  • DE-A-2 262 488 discloses an electromagnetic valve comprising a 3)ve seat member forming a main magnetic pole member, a spherical valve member and a side magnetic pole member which guides the spherical valve member preventing thereby lateral movement of the latter and concentrating the magnetic field so that it acts in an improved manner on the spherical valve member.
  • the present invention contemplates overcoming problems encountered in conventional and already proposed electromagnetic valves, by provided guide means associated with said valve seat and the end of said main magnetic pole member for maintaining a second clearance between said valve member and said side magnetic pole member so that said spherical valve member is prevented from contacting said side magnetic pole member.
  • the main magnetic pole and valve seat are so formed that the lateral movement of a spherical valve member is restricted and the valve member is guided to be correctly seated on the contact surfaces therefor.
  • FIG. 1 and 2 of the drawings there is shown a preferred embodiment of an electromagnetic valve 10 in accordance with the present invention, which is usable for controlling the amount of fuel flow supplied to an internal combustion engine for an automotive vehicle, though not shown.
  • the electromagnetic valve 10 is composed of a base member 12 which is formed with a fluid inlet passage 14 into which a fluid is introduced through an inlet pipe 16.
  • the base member 12 is further formed with a fluid outlet passage 17 from which the fluid is discharged out of the valve 10 through an outlet pipe 18.
  • a spherical valve member 20 made of magnetic material is seatable on a valve seat member 22.
  • the valve seat member 22 is made of non-magnetic material and disposed such that a lower portion (no numeral) thereof is embedded in the base member 12 and an upper portion (no numeral) thereof projects into a recess 24 formed in the top section of the base member 12.
  • the valve seat member 22 is generally cylindrical and formed with a passage 22a which forms part of the fuel outlet passage 17.
  • a generally cylindrical casing 26 is secured to the base member 12 in such a manner that a bottom section 26a thereof is securely and sealingly disposed in the recess 24.
  • a magnetic core 28 is disposed in the casing 26 and integrally provided with a lid section 30 which closes an opening formed in the top section of the casing 26.
  • An electromagnetic coil'32 is disposed around the outer periphery of the magnetic core 28 through a bobbin 34.
  • the magnetic core 28 is formed with a tip portion 28a which serves as a main magnetic pole when electric current is supplied to the magnetic coil 32 and the magnetic core 28 is energized.
  • the axis of the magnetic core 28 is aligned with that of the valve seat member 22.
  • the core 28 is provided at its tip portion 28a with a valve contact surface S i which is located opposite to a valve contact surface S 2 of the valve seat member 22. It is to be noted that the valve member 20 is movably located between the contact surfaces S, and S 2 and the stroke of the valve member 20 in the upward and downward directions is restricted by the contacting surfaces S, and S 2 .
  • the casing 26 is formed with a radial annular portion 26b which surrounds the valve member 20.
  • the inner peripheral portion P of the annular portion 26b is spaced from and between the level of the extreme end of the tip portion 28a of the magnetic core 28 and the level of the extreme end of the tip portion of the valve seat member 22. Additionally, the inner peripheral portion P lies as near as possible to the valve member, but never contacts the valve member 20.
  • the radial annular portion 26b is so arranged that the axes of the magnetic core 28 and the valve seat member 22 are perpendicular to the flat surface (no numeral) of the radial annular portion 26b.
  • the inner peripheral portion P of the annular portion 26b is made of magnetic material and serves as a side magnetic pole, so that magnetic field is formed between the tip portion 28a of the core 28 and the inner peripheral portion P.
  • the valve contacting surfaces S1 and S 2 are frusto-conical or part-spherical. Accordingly, the lateral movement or movement in the direction of the side magnetic pole P of the valve member is restricted as seen from one indicated in phantom in Fig. 2. Furthermore, by virtue of the shapes of the contacting surfaces S i and S 2 . the valve member 20 can be correctly seated on the contacting surfaces S, and S 2 . As clearly seen from Fig. 2, the tip portion 28a of the magnetic core 28 is formed with a hollow 36 and accordingly the tip portion 28a is formed in cylindrical shape.
  • the hollow 36 communicates through a passage 38 with an upper fuel chamber F 1 which communicates with a lower fuel chamber F 2 through an annular opening (no numeral) defined between the side magnetic pole P and the spherical valve member 20.
  • the lower fuel chamber F 2 is defined between the recessed surface of the base member 12 and the surface of the bottom section 26a of the casing 26. It will be understood that the fuel in the fuel chambers F, and F 2 is admitted into the fuel outlet passage 17 through the passage 22a of the valve seat member 22 when the valve member 20 separates from the valve contacting surface S 2 of the valve seat member 22.
  • valve member 20 When electric current is not passed through the magnetic coil 32 and the magnetic core 28 is not energized, magnetic force does not act on the spherical valve member 20. At this time, the valve member 20 receives the pressure of the fluid introduced into the hollow 36 through the passage 38 in addition to the pressure of the fluid in the fluid chambers F 1 and F 2 . Accordingly, the valve member 20 is pushed downward in the drawing to be firmly seated on the surface S 2 of the valve seat member 22. As a result, the fluid in the fluid chambers F 1 and F 2 cannot flow to the fluid outlet passage 17.
  • the valve member 20 By the action of thus generated magnetic force, the valve member 20 is moved upward in the drawing to be attracted to the main magnetic pole 28a. Then, the spherical valve member 20 is guided to the frusto-conical of part-spherical surfaces S,, and the lateral movement of the valve member 20 is effectively restricted by the co-operation of the surface S, and the surface 5 2 , Accordingly, the spherical valve member 20 is correctly seated on the surface S 1 of the main magnetic pole 28a, preventing the vibration of the valve member 20 in the lateral direction or the direction of the side magnetic pole P.
  • the fluid admitted to the fluid chambers F 1 and F 2 flows into the fluid outlet passage 17 through a first clearance formed between the surface of the spherical valve member 20 and the contact surface S 2 of the valve seat member 22.
  • the fluid introduced into the outlet passage 17 is supplied through the pipe 18 into a required position though not shown.
  • the pressure differential is generated between the upstream and downstream sides relative to the valve member 20 since the pressure at the first clearance between the valve member 20 and the valve seat member 22 lowers by the fluid flow through the clearance. Accordingly, the spherical valve member 20 receives the force to be pulled downward in the drawing due to the above-mentioned pressure differential whenever the fluid flows.
  • the closing action of the valve member 20 can be achieved by the pressure differential generated due to the fluid flow through the first clearance between the valve member 20 and the surface S 2 of the valve seat member 22 in addition to the pressure for admitting fluid, although such closing action of the valve member may be achieved by the action of a spring as in conventional cases. Therefore, the arrangement described above can effectively prevent unstable behaviour of the spherical valve member 20 due to the inclined location of the valve member 20 and the vibration to the valve member 20, which greatly contributes to the improvement in response time and stability in the opening and closing actions of the spherical valve member 20.
  • the fluid adjacent the surface of the valve member 20 is easily introduced into the hollow 36 since the latter communicates through the passage 38 with the fluid chamber F i l
  • This can effectively prevent a disadvantageous damping effect on the valve member 20 due to the fluid adjacent the surface of the valve member which damping effect is liable to rise when the valve member 20 is seated on the surface S, of the main magnetic pole 28a at the beginning of the opening action of the valve member 20.
  • the adhesion of the valve member 20 onto the contact surface S, of the main magnetic member 28a is effectively prevented by the fluid supply from the hollow 36 and the passage 38.
  • the sticking of the valve member 20 is liable to occur at the beginning of the closing action of the valve member 20, i.e., at the beginning of the downward movement of the valve member in the drawing. This can improve the response characteristics of the spherical valve member 20, contributing to the omission of a spring for forcing the valve member 20 downward.
  • the hollow 36 formed at the main magnetic pole 28a is replaceable with a plurality of grooves 40 formed on the contact surface S 1 1 of the main magnetic pole 28a.
  • the fluid is present in the grooves 40 which communicate with the fluid chamber F, though not shown. It will be understood that, also with these grooves 40, the same effect as with the hollow 36 in Figs. 1 and 2 can be obtained.
  • the contact surface S 1 of the main magnetic pole 28a may be flat as the distance between the surfaces S 1 and S 2 is within a range that the lateral movement of the spherical valve member 20 is restricted by the frusto-conical or part-spherical surface S 2 of the valve seat member 22.
  • the stroke of the valve member 20 in the axial direction of the main magnetic pole 28 and the valve seat member 22 is preferably about 0.05 to 0.1 mm from the point of view of response characteristics and durability.
  • the stroke of the valve member 20 is about 0.075 mm when the diameter of the valve member 20 is 5 mm; the shortest distance between the side magnetic pole P and the valve member 20 which is correctly seated on the valve seat member is about 0.1 to 0.25 mm; the angle of the contacting surface S, (in cross- section in Fig. 2) with respect to a horizontal plane (not shown) is about 45 degrees; and the angle of the contacting surface S 2 (in cross- section in Fig. 2) with respect to the horizontal plane is about 35 to 45 degrees. It will be appreciated that the stroke of the valve member 20 may be so determined that a sufficient opening area can be obtained to attain the amount of fuel flow suitable for use.
  • the side magnetic pole P is located in close proximity to the spherical valve member 20 and therefore an effective magnetic field is formed relative to the spherical valve member 20, which improves the response characteristics and the stability in the opening and closing actions of the spherical valve member 20.
  • a spring for biasing the valve member 20 toward the valve seat member 22 is not used, inclination of the valve member 20 is prevented to improve the sealing ability of the valve member 20 and the stability of the action of the valve member 20, further improving the response characteristics of the opening action of the valve member 20.
  • Such omission of the spring further contributes to an improvement in the durability of the electromagnetic valve, since the breakage of the spring does not occur.
  • the spherical valve member 20 is not provided with a slidable portion it becomes possible to carry out the opening and closing actions of the valve member 20 at a very high frequency, greatly contributing to an improvement in the durability of the electromagnetic valve.
  • the electromagnetic valve according to the present invention is advantageous in productivity as compared with a conventional electronically controlled fuel injection system which is provided with an electromagnetic valve using a slidable elongate valve member and operated in response to the amount, intake air due to the fact such an elongate valve member and its guide member require high precision machining in its production.
  • the electromagnetic valve according to the present invention makes it possible to inject fuel at the rate of a plurality of times per engine revolution, improving the mixing of fuel and intake air.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetically Actuated Valves (AREA)
  • Fuel-Injection Apparatus (AREA)
EP19790301297 1978-07-05 1979-07-05 Electromagnetic valve and its use as a fuel injector valve Expired EP0006769B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP9179678U JPS603425Y2 (ja) 1978-07-05 1978-07-05 流量制御用電磁弁
JP91796/78 1978-07-05

Publications (2)

Publication Number Publication Date
EP0006769A1 EP0006769A1 (en) 1980-01-09
EP0006769B1 true EP0006769B1 (en) 1981-11-11

Family

ID=14036567

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19790301297 Expired EP0006769B1 (en) 1978-07-05 1979-07-05 Electromagnetic valve and its use as a fuel injector valve

Country Status (3)

Country Link
EP (1) EP0006769B1 (enrdf_load_stackoverflow)
JP (1) JPS603425Y2 (enrdf_load_stackoverflow)
DE (1) DE2961313D1 (enrdf_load_stackoverflow)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE17883T1 (de) * 1981-04-29 1986-02-15 Solex Uk Ltd Eine elektromagnetische f luessigkeitseinspritzvorrichtung und ein einzelpunktkraftstoffeinspritzsystem fuer eine verbrennungskraftmaschine.
US4454713A (en) * 1981-06-04 1984-06-19 Chandler Evans Inc. Pulse width modulated fuel metering system
DE3336010A1 (de) * 1983-10-04 1985-04-18 Robert Bosch Gmbh, 7000 Stuttgart Elektromagnetisch betaetigbares ventil
DE3916459A1 (de) * 1989-05-20 1990-11-22 Bosch Gmbh Robert Elektromagnetisch betaetigtes ventil
DE19537382A1 (de) * 1995-10-07 1997-04-10 Bosch Gmbh Robert Elektromagnetisch betätigbares Ventil, insbesondere Brennstoffeinspritzventil
CN111658247B (zh) * 2020-07-09 2023-11-10 郭振宇 尿道置入式尿控系统及其安装组件

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1330181A (en) * 1970-09-25 1973-09-12 Petrol Injection Ltd Fuel injection nozzles
US3865312A (en) * 1972-01-06 1975-02-11 Renault Electromagnetically operated ball-type injectors
GB1516939A (en) * 1976-05-04 1978-07-05 Plessey Co Ltd Liquid injection device

Also Published As

Publication number Publication date
JPS559902U (enrdf_load_stackoverflow) 1980-01-22
JPS603425Y2 (ja) 1985-01-30
EP0006769A1 (en) 1980-01-09
DE2961313D1 (en) 1982-01-14

Similar Documents

Publication Publication Date Title
EP0007724B1 (en) Fuel injector valve
US6076802A (en) Fuel injection valve
EP1236888B1 (en) Fluid injection nozzle
EP0117603B1 (en) Fuel injection valve
US4057190A (en) Fuel break-up disc for injection valve
US4101074A (en) Fuel inlet assembly for a fuel injection valve
JPH02211267A (ja) 噴射弁
JPH01247761A (ja) 燃料噴射弁
US5820032A (en) Electromagnetically activated valve, particularly a fuel injection valve
US4354640A (en) Electromagnetically actuatable valve
US5044561A (en) Injection valve for fuel injection systems
JP2002500308A (ja) 加圧渦流型燃料噴射器の平頭ニードル
KR20020072292A (ko) 연료 분사 밸브
KR20040093064A (ko) 내연 기관용 연료 분사 밸브
US20040011896A1 (en) Contaminant tolerant compressed natural gas injector and method of directing gaseous fuel therethrough
EP0006769B1 (en) Electromagnetic valve and its use as a fuel injector valve
KR20070103077A (ko) 연료 분사 밸브
US20040195388A1 (en) Fuel-injection valve
US5285969A (en) Electromagnetically operated fuel injection valve
JPH08232812A (ja) 流体噴射ノズル
AU635785B2 (en) Electromagnetically operated fuel-injection valve
US6824085B2 (en) Fuel injector
US7017839B2 (en) Fuel injection valve
JP2006509139A (ja) 燃料噴射弁
JP2003003934A (ja) 燃料噴射弁

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB

17P Request for examination filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): DE FR GB

REF Corresponds to:

Ref document number: 2961313

Country of ref document: DE

Date of ref document: 19820114

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19840621

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19880331

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19920508

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19920727

Year of fee payment: 14

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19930705

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19930705

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19940401

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT