GB1582910A - Fuel injection valve for an internal combustion engine - Google Patents

Fuel injection valve for an internal combustion engine Download PDF

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Publication number
GB1582910A
GB1582910A GB16866/78A GB1686678A GB1582910A GB 1582910 A GB1582910 A GB 1582910A GB 16866/78 A GB16866/78 A GB 16866/78A GB 1686678 A GB1686678 A GB 1686678A GB 1582910 A GB1582910 A GB 1582910A
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GB
United Kingdom
Prior art keywords
nozzle
valve
bore
fuel
fuel injection
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
GB16866/78A
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB1582910A publication Critical patent/GB1582910A/en
Expired legal-status Critical Current

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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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F02M51/0675—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the valve body having cylindrical guiding or metering portions, e.g. with fuel passages
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/08—Injectors peculiar thereto with means directly operating the valve needle specially for low-pressure fuel-injection
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/06—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves being furnished at seated ends with pintle or plug shaped extensions
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/166—Selection of particular materials
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

(54) IMPROVED FUEL INJECTION VALVE FOR AN INTERNAL COMBUSTION ENGINE (71) We, ROBERT BOSCH GMBH, a German company of Postfach 50, 7 Stuttgart 1, Federal Republic of Germany. do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to fuel injection valves for internal combustion engines, particularly but not exclusively for vehicle engines having petrol injection.
In known fuel injection valves, a pintle on the valve closure member extends through a nozzle bore formed directly in a valve body on which the valve seat is formed and which is generally in the form of an elongate hollow body having the valve seat incorporated at the bottom and guiding the valve closure member. In this construction, the valve body cannot meet, to an optimum extent, the wide variety of demands which its multiple function makes on the material from which it is made. In the case of a deposit which is difficult to remove, the entire injection valve might have to be changed when the valve body is unreleasably fitted in a valve housing by means of, example, a flange.
In accordance with this invention there is provided a fuel injection valve for an internal combustion engine having a closure member which cooperates with a valve seat on a valve body and whose end face has a pintle which extends through a nozzle bore, a clearance being formed therebetween which acts as a metering gap, the nozzle bore being contiguous to the valve seat and being formed in a nozzle body which is inserted into the valve body.
In contrast to the prior construction therefore, an injection valve in accordance with this invention has an advantage in that, when choosing the material for the nozzle body, other demands made on the valve body do not have to be taken into account.
Thus, the nozzle body can be made from a material which meets, to an optimum extent, the demands with respect to surface quality and chemical resistance. The nozzle body used has the further advantage that, in mass production, it permits the number of types of valve bodies to be reduced,-and hence permits standardization of the valve body.
A particularly advantageous material for constructing-the nozzle body is synthetic precious stone, on which surfaces of the highest quality can be produced and which is virtually fully resistant to corrosion. Furthermore, when the nozzle body has a portion which projects from the valve body and which has an annular drip edge, the fuel rapidly flows out of the nozzle bore when the engine is stationary, whereby the risk of corrosion is further reduced.
The invention is further described hereinafter, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a longitudinal section through an injection valve in accordance with the invention; and Figure 2 shows a detail of Figure 1, drawn to a larger scale.
The electro-magnetically operable fuel injection valve illustrated is intended for use in a low pressure fuel injection system of an internal combustion engine. Its steel housing 1 has a central bore 2, which accommodates a coil former 3 carrying solenoid windings 4, and which continues in the form of a substantially smaller coaxial bore 5. A soft iron core 6, fitted in the coil former 3, extends coaxially of the bore 5 and its portion remaining outside the housing 1 is in the form of a connection nipple 7 for a fuel feed line indicated at 8. The soft iron core 6 also has a flange 9 which is secured in the housing by means of a flanged rim 10 and which acts as a member for con ducting magnetic flux to the housing 1.
At the end of the soft iron core 6 which extends into the bore of the coil former 3, there is a plurality of longitudinal slots 11 which suppress the formation of eddy cur rents therein. The slotted end is located opposite the armature 12 which is also slotted and which is screwed onto a nozzle valve closure member 15. The nozzle valve member is longitudinally displaceably guided in a valve body 17, which is secured in the reduced end portion of the housing by means of a flanged rim 16. Incorporated in the valve member is a longitudinal bore 18, (indicated by broken lines) which intersects a transverse bore 19 from which fuel, fed through the longitudinal bore, can radially emerge into the chamber of the nozzle body.From there, the fuel can flow into the annular chamber 21, which is directly up stream of the valve seat 23 of the nozzle needle, by way of longitudinal grooves 20 incorporated in the nozzle valve member 15.
To prevent fuel from leaving the valve when the solenoid is de-energized, the nozzle valve member 15 is pressed against the valve seat 23 by a closure spring 24 which abuts against a setscrew 25. The setscrew 25 has a central bore 26 for the ingress of fuel and its end portion which is remote from the armature 12, and which carries a screw-thread 27, is provided with a transverse slot for receiving an adjusting tool.
The valve seat 23 is formed in a frusto conical bore portion 30 (see Figure 2) in the bottom 31 of the valve body 17. a cylindrical bore portion 32 being contiguous to the bore portion 30. A nozzle body 34 in the form of a separate part is pressed into the bore portion 32, and a pintle 36 on the end face of the nozzle valve member 15 extends, with clearance, through the nozzle bore 35 in the nozzle body 34. The nozzle body 34 is made from synthetic precious stone so that the nozzle bore 35 has a very smooth surface which cannot be obtained in steel members or which can be obtained therein but only at very great expense.The clearance 38 be tween the wall of the nozzle bore 35 and the pintle 36 of the nozzle valve member 15, forms, the metering gap of the valve whose magnitude determines, m conjunction with the fuel supply pressure, the quantity of fuel injected each time the valve is operated.
An end 40 of the nozzle body 34, which extends out of the bore portion b:!, torms an annular drip edge 41 which merges into the nozzle bore 35 by way of a frusto-conical surface 42.
When the solenoid is energized, the arma ture 12 is pulled towards the magnet core 6, whereby the nozzle valve member 15 is lifted from the valve seat 23 and the fuel can flow through the metering gap 38 into an intake pipe of the internal combustion engine. Owing to the smooth surface of the nozzle bore 35 and the resistance of the precious stone to chemical attack from the fuel and the atmosphere in the intake pipe, the metering gap 8 remains virtually free from deposits even after a long time in operation, so that, with a constant pressure system, the quantity of fuel injected remains constant. In many cases, it may be advantageous to secure the valve body 17 in the housing 1 in a releasable manner, so that the nozzle body 34 can also be changed if required.Such an eventuality might occur after a long time in operation when a petrol having particularly high residues and corrosive properties is used in vehicles having exhaust gas feedback.
The drip edge 41 ensures that, when fuel condenses on the nozzle wall, or when the engine is not running, the fuel can rapidly flow away. This measures assists, in an advantageous manner, the endeavour to avoid deposits in the metering gap of the valve from the outset.
WHAT WE CLAIM IS: 1. A fuel injection valve for an internal combustion engine having a closure member which cooperates with a valve seat on a valve body and whose end face has a pintle which extends through a nozzle bore, a clearance being formed therebetween which acts as a metering gap, the nozzle bore being continguous to the valve seat and being formed in a nozzle body which is inserted into the valve body.
2. A fuel injection valve as claimed in claim 1 in which the nozzle body is made from synthetic precious stone.
3. A fuel injection valve as claimed in claim 1 or 2 in which the nozzle body has a portion which projects out of the valve body to form a drip edge.
4. A fuel injection valve as claimed in claim 3 in which the drip edge is substantially annular.
5. A fuel injection valve as claimed in claim 3 or 4 in which the drip edge merges into the nozzle bore by way of a substantially frusto-conical surface.
6. A fuel injection valve substantially as hereinbefore described with reference to, and as illustrated in, the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    10 and which acts as a member for con ducting magnetic flux to the housing 1.
    At the end of the soft iron core 6 which extends into the bore of the coil former 3, there is a plurality of longitudinal slots 11 which suppress the formation of eddy cur rents therein. The slotted end is located opposite the armature 12 which is also slotted and which is screwed onto a nozzle valve closure member 15. The nozzle valve member is longitudinally displaceably guided in a valve body 17, which is secured in the reduced end portion of the housing by means of a flanged rim 16. Incorporated in the valve member is a longitudinal bore 18, (indicated by broken lines) which intersects a transverse bore 19 from which fuel, fed through the longitudinal bore, can radially emerge into the chamber of the nozzle body.From there, the fuel can flow into the annular chamber 21, which is directly up stream of the valve seat 23 of the nozzle needle, by way of longitudinal grooves 20 incorporated in the nozzle valve member 15.
    To prevent fuel from leaving the valve when the solenoid is de-energized, the nozzle valve member 15 is pressed against the valve seat 23 by a closure spring 24 which abuts against a setscrew 25. The setscrew 25 has a central bore 26 for the ingress of fuel and its end portion which is remote from the armature 12, and which carries a screw-thread 27, is provided with a transverse slot for receiving an adjusting tool.
    The valve seat 23 is formed in a frusto conical bore portion 30 (see Figure 2) in the bottom 31 of the valve body 17. a cylindrical bore portion 32 being contiguous to the bore portion 30. A nozzle body 34 in the form of a separate part is pressed into the bore portion 32, and a pintle 36 on the end face of the nozzle valve member 15 extends, with clearance, through the nozzle bore 35 in the nozzle body 34. The nozzle body 34 is made from synthetic precious stone so that the nozzle bore 35 has a very smooth surface which cannot be obtained in steel members or which can be obtained therein but only at very great expense.The clearance 38 be tween the wall of the nozzle bore 35 and the pintle 36 of the nozzle valve member 15, forms, the metering gap of the valve whose magnitude determines, m conjunction with the fuel supply pressure, the quantity of fuel injected each time the valve is operated.
    An end 40 of the nozzle body 34, which extends out of the bore portion b:!, torms an annular drip edge 41 which merges into the nozzle bore 35 by way of a frusto-conical surface 42.
    When the solenoid is energized, the arma ture 12 is pulled towards the magnet core 6, whereby the nozzle valve member 15 is lifted from the valve seat 23 and the fuel can flow through the metering gap 38 into an intake pipe of the internal combustion engine. Owing to the smooth surface of the nozzle bore 35 and the resistance of the precious stone to chemical attack from the fuel and the atmosphere in the intake pipe, the metering gap 8 remains virtually free from deposits even after a long time in operation, so that, with a constant pressure system, the quantity of fuel injected remains constant. In many cases, it may be advantageous to secure the valve body 17 in the housing 1 in a releasable manner, so that the nozzle body 34 can also be changed if required.Such an eventuality might occur after a long time in operation when a petrol having particularly high residues and corrosive properties is used in vehicles having exhaust gas feedback.
    The drip edge 41 ensures that, when fuel condenses on the nozzle wall, or when the engine is not running, the fuel can rapidly flow away. This measures assists, in an advantageous manner, the endeavour to avoid deposits in the metering gap of the valve from the outset.
    WHAT WE CLAIM IS: 1. A fuel injection valve for an internal combustion engine having a closure member which cooperates with a valve seat on a valve body and whose end face has a pintle which extends through a nozzle bore, a clearance being formed therebetween which acts as a metering gap, the nozzle bore being continguous to the valve seat and being formed in a nozzle body which is inserted into the valve body.
  2. 2. A fuel injection valve as claimed in claim 1 in which the nozzle body is made from synthetic precious stone.
  3. 3. A fuel injection valve as claimed in claim 1 or 2 in which the nozzle body has a portion which projects out of the valve body to form a drip edge.
  4. 4. A fuel injection valve as claimed in claim 3 in which the drip edge is substantially annular.
  5. 5. A fuel injection valve as claimed in claim 3 or 4 in which the drip edge merges into the nozzle bore by way of a substantially frusto-conical surface.
  6. 6. A fuel injection valve substantially as hereinbefore described with reference to, and as illustrated in, the accompanying drawings.
GB16866/78A 1977-04-29 1978-04-28 Fuel injection valve for an internal combustion engine Expired GB1582910A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19777713528U DE7713528U1 (en) 1977-04-29 1977-04-29 FUEL INJECTION VALVE FOR COMBUSTION MACHINES

Publications (1)

Publication Number Publication Date
GB1582910A true GB1582910A (en) 1981-01-14

Family

ID=6678315

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16866/78A Expired GB1582910A (en) 1977-04-29 1978-04-28 Fuel injection valve for an internal combustion engine

Country Status (3)

Country Link
JP (1) JPS53136124A (en)
DE (1) DE7713528U1 (en)
GB (1) GB1582910A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2445896A1 (en) * 1979-01-04 1980-08-01 Bosch Gmbh Robert INJECTION VALVE FOR FUEL INJECTION PLANTS OF INTERNAL COMBUSTION ENGINES
FR2533971A1 (en) * 1982-09-30 1984-04-06 Bendix Corp FUEL INJECTOR
US4634055A (en) * 1984-05-19 1987-01-06 Robert Bosch Gmbh Injection valve with upstream internal metering

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01131867U (en) * 1988-02-25 1989-09-07
AT1622U1 (en) * 1995-02-28 1997-08-25 Avl Verbrennungskraft Messtech INJECTION SYSTEM WITH AN INJECTION VALVE FOR A SELF-IGNITING INTERNAL COMBUSTION ENGINE

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5233730B2 (en) * 1972-05-04 1977-08-30

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2445896A1 (en) * 1979-01-04 1980-08-01 Bosch Gmbh Robert INJECTION VALVE FOR FUEL INJECTION PLANTS OF INTERNAL COMBUSTION ENGINES
FR2533971A1 (en) * 1982-09-30 1984-04-06 Bendix Corp FUEL INJECTOR
US4634055A (en) * 1984-05-19 1987-01-06 Robert Bosch Gmbh Injection valve with upstream internal metering

Also Published As

Publication number Publication date
JPS53136124A (en) 1978-11-28
DE7713528U1 (en) 1978-10-19

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee