EP0215527A1 - Electro-injecteur d'alimentation de combustible pour moteurs à combustion interne et son procédé de fabrication - Google Patents
Electro-injecteur d'alimentation de combustible pour moteurs à combustion interne et son procédé de fabrication Download PDFInfo
- Publication number
- EP0215527A1 EP0215527A1 EP86201589A EP86201589A EP0215527A1 EP 0215527 A1 EP0215527 A1 EP 0215527A1 EP 86201589 A EP86201589 A EP 86201589A EP 86201589 A EP86201589 A EP 86201589A EP 0215527 A1 EP0215527 A1 EP 0215527A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- core
- annular
- annular element
- armature
- centre core
- 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.)
- Granted
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims description 9
- 238000002485 combustion reaction Methods 0.000 title claims description 3
- 238000004519 manufacturing process Methods 0.000 title description 10
- 239000004033 plastic Substances 0.000 claims abstract description 13
- 229920003023 plastic Polymers 0.000 claims abstract description 13
- 238000002347 injection Methods 0.000 claims abstract description 8
- 239000007924 injection Substances 0.000 claims abstract description 8
- 239000007787 solid Substances 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 7
- 239000003302 ferromagnetic material Substances 0.000 claims description 6
- 230000000284 resting effect Effects 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910052729 chemical element Inorganic materials 0.000 claims description 2
- 230000001276 controlling effect Effects 0.000 claims 1
- 230000000875 corresponding effect Effects 0.000 claims 1
- 229940090044 injection Drugs 0.000 abstract description 6
- 238000003754 machining Methods 0.000 abstract description 5
- 230000005294 ferromagnetic effect Effects 0.000 abstract 1
- 230000005291 magnetic effect Effects 0.000 description 3
- 230000036961 partial effect Effects 0.000 description 3
- 208000036366 Sensation of pressure Diseases 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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
- 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
- F02M51/0667—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 acting as a valve or having a short valve body attached thereto
Definitions
- the present invention relates to an electroinjector for the feed of fuel to an internal combustion engine, and to a process for the manufacturing thereof.
- the invention relates to an electroinjector of the type comprising an encasing body, inside which a centre core is positioned of ferromagnetic material, at least partly surrounded by an actuator coil; a movable armature of ferromagnetic material, of substantially hollow cylindrical shape, and bearing at one of its ends a closure element suitable to interrupt, in one position of said armature, the passage of fuel through an injection nozzle under the action of a return spring; and an annular shoulder element impact-resistant and at least partly amagnetic, solid with the core and suitable to act as stop shoulder for an opposite end of said armature in another position of said armature in which the closure element leaves open the fuel passage through the injection nozzle, the armature being guided by a small tube inserted in the centre core and protruding therefrom.
- the annular shoulder element coaxially driven on the outer wall or on the inner wall of the centre core and fastened by diametral interference, protrudes axially from the core end, so that in the position of end lift of the armature, when this latter rests against the annular element, a small clearance remains between the armature and the core.
- This clearance together with the nature of the material of the annular element, avoids the occurrence of phenomena of magnetic sticking between the arma ture and the core, phenomena which on the contrary occur in case of direct contact, due to the progressive leveling of the contact surfaces, and hence of the increase of actual contact area, which over time generates considerable adhesion forces.
- the purpose of the present invention is now to provide an electroinjector of the type mentioned in the introduction, which can be obtained in a mass-production at competitive costs, while guaranteeing the observance of particularly precise dimensions, but without requiring the observance of severe tolerances for the dimensions of the individual components, but allowing on the contrary medium-precision processes to be adopted for components machining.
- the above mentioned purpose is achieved in that in an electroinjector of the type mentioned in the introduction, the annular shoulder element fastened by driving on the centre core is affixed in position with deformation or plastic yielding, in an essentially axial direction, of a portion of the centre core or of a component interposed between the annular element and the centre core.
- said deformation or plastic yielding is accomplished in the step of assembly of the annular element on the centre core, by means of an action of impulsive driving of the annular element previously pressure-slided on the core.
- the core portion which undergoes the plastic defor mation can be a substantially conical portion radiusing the diametrically narrower core portion receiving the annular element, to the subsequent diametrically larger portion provided on fuel feed side.
- the component elements (the core and the annular element) manufactured with medium-precision processes, which would allow a dimensional variability of the clearance of, e.g., 150 ⁇ m, are made assume, in the assembly step, mutual positions securing the observance of the dimensions required for the correct operating of the electroinjector.
- the low ratio existing between the fitting length and the diameter of the annular element secures, in the driving step, also the parallelism and the normality of the two elements being assembled.
- the portion between the annular element and the core which undergoes the plastic deformation can also be a separate element of high-plasticity material, interposed between the annular element and the core, such as, e.g., advantageously, a copper washer, interposed between the annular element and a flat stop shoulder provided on the core, perpendicular to core axis.
- a separate element of high-plasticity material interposed between the annular element and the core, such as, e.g., advantageously, a copper washer, interposed between the annular element and a flat stop shoulder provided on the core, perpendicular to core axis.
- the deformation is undergone to exclusively by the washer.
- an electroinjector of the type being the object of the present invention comprises a cylindrical centre core 10 of ferromagnetic material, housed inside an encasing body 11, it too of ferromagnetic material, and extending to the outside of the body 11 to form a fitting 10a to connect the injector to the fuel feed.
- a movable armature 12 of ferromagnetic material is coaxially associated, which, together with the core 10 and the body 11, forms a magnetic circuit.
- the core 10 is at least partly surrounded by a coil 13, wound around a bobbin 14, which is electrically fed, in a per se known way, with intermittent drive, by means of conductors 15 partly embedded in a cap of plastics 16.
- the movable armature 12 bears a closure element 17 with the interposition of a washer 18, and is guided by a tube 19 inserted in the core 10, but protruding out of it.
- a spring 20 keeps the closure element 17 normally pressed against the shoulder of an injection nozzle 21, provided, in a per se known way, with a calibrated bore for the outlet of the fuel.
- the spring 20 reacts against a sleeve 22 inserted with interference inside the core 10 and centrally open to allow the flow of the fuel.
- annular spacer 23 is placed, substantially defining the stroke of the armature 12, which on its side facing towards the core 10 comes to stop against an annular shoulder element 24, of impact-resistance material, and at least partly amagnetic, mounted on the core 10 so as to axially protrude from the end of core 10, leaving a small clearance T, fig. 2, between the armature 12 and the core 10 in the armature lift end position, in correspondence of which the closure element 17 leaves open the passage through the nozzle 21.
- the annular shoulder element 24 guarantees that phenomena of magnetic and/or hydraulic sticking, detrimental to the purpose of a quick closure of the injector may not occur.
- the hydraulic tightness is secured by seal rings 25, 26 and 36.
- the fuel fed through the sleeve 22, arrives, in a per se known way, to the bores 27 of the core 10 and then to the bores 28 of the armature 12, from which the fuel flows to the outside of the nozzle 21.
- the annular element 24, manufactured with medium precision, is driven on the core 10, it too manufactured with medium precision, by diametrical interference up to a certain axial position, and is then fixed in position by plastic deformation of a portion of the core 10 in an essentially axial direction, or by plastic deformation of an element interposed in axial direction between the annular element 24 and the core 10.
- the core 10 is provided, in correspondence of its end portion on which the annular element 24 is to be driven, with an annular groove 29 between a shorter-diameter portion 30 and a longer-diameter portion 31, this latter being radiused to the main cylindrical portion of the core 10.
- the conical radiusing section between the groove 29 and the portion 31 represents in this form of embodiment the portion which on the end assemblage of the annular element 24 undergoes the plastic deformation, as it can be observed by comparing figs 3 and 4.
- the affixing in the end position is carried out by means of an impulsive action on the annular element 24 with the interposition of a pusher 32, the stem of which is driven inside the core 10, and the head od which rests against the front end of the annular element 24.
- the head of the pusher 32 is advantageously provided, on its face facing the stem, with a step 44 of height H and of diameter slightly shorter than the inner diameter of the annular element 24, which step 44, by coming to rest against the front surface of the core 10, determines the end of the axial stroke of pusher 32 and, consequently, the value of the end protrusion, or clearance T of fig. 2, of the annular element 24 from the front surface of said core.
- the dimension H of the step 44 is slightly different from the dimension T of desired clearance. Even in the complete absence of the step 44, a clearance T shall hence be formed, even if of the order of a few hundredths of millimeter only.
- a tool which can be advantageously used to exert the impulsive action is illustrated in figs. 7 and 8. It comprises a stationary support 33, on the upper part of which a mass 35 is hinged, in the nearby of 34, through a supporting rod 37. To the lower portion of the support 33, the core 10 is fixed in a correspondingly shaped seat 38, in such a way that the front end of the core 10, on which the annular element 24 has to be mounted, protrudes from the side facing towards the mass 35 on the trajectory of the same mass 35.
- the core 10 is fixed by means of a ring nut 39 screwed down in a sleeve 40 fastened on the support 33.
- a pin 41 is centrally fastened, suitable to act on the pusher 32 inserted in the core 10.
- the arrangement is such that the axis of the core 10 and of the annular element 24 coincides with the tangent to the trajectory of the centre of the pin 41 in the lowermost point of the same trajectory.
- the annular element 24 can be driven on the core 10 by means of static pre-driving by press with a force of 90 - 100 kg, and the dynamic end driving can be obtained with a work of 0.07 kgm.
- the plastic deformation is envisaged to occur on a washer 42, e.g., a copper washer, axially interposed between the annular element 24 and a flat stop shoulder 43 provided on the core 10, extending crosswise relatively to the axis of core 10.
- the end driving can be carried out in this case in a way analog to that described for the foregoing form of embodiment.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT2220685 | 1985-09-19 | ||
| IT22206/85A IT1185353B (it) | 1985-09-19 | 1985-09-19 | Elettroiniettore per l'alimentazione di combustibile ad un motore a combustione interna e procedimento per la sua realizzazione |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0215527A1 true EP0215527A1 (fr) | 1987-03-25 |
| EP0215527B1 EP0215527B1 (fr) | 1990-08-29 |
Family
ID=11193034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP86201589A Expired - Lifetime EP0215527B1 (fr) | 1985-09-19 | 1986-09-16 | Electro-injecteur d'alimentation de combustible pour moteurs à combustion interne et son procédé de fabrication |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0215527B1 (fr) |
| DE (1) | DE3673731D1 (fr) |
| IT (1) | IT1185353B (fr) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996041947A1 (fr) * | 1995-06-08 | 1996-12-27 | Siemens Automotive Corporation | Procede d'ajustage d'un entrefer d'un electro-aimant |
| EP0781915A1 (fr) * | 1995-12-26 | 1997-07-02 | General Motors Corporation | Injecteur de carburant |
| WO1999032785A1 (fr) * | 1997-12-23 | 1999-07-01 | Siemens Automotive Corporation | Injecteur de carburant a soupape a bille |
| RU2142062C1 (ru) * | 1997-12-23 | 1999-11-27 | ООО "Прецизика-сервис", Сухан Федор Федорович | Электромагнитная форсунка для двигателя внутреннего сгорания |
| RU2161722C2 (ru) * | 1999-01-05 | 2001-01-10 | ООО "Прецизика-сервис" | Электромагнитная форсунка для двигателя внутреннего сгорания |
| RU2187686C2 (ru) * | 2000-05-17 | 2002-08-20 | ООО "Прецизика-сервис" | Электромагнитная форсунка для двигателя внутреннего сгорания |
| DE102005015409B4 (de) | 2005-04-04 | 2019-01-03 | Continental Automotive Gmbh | Verfahren und Vorrichtung zur Vorgabe eines Abstands zwischen einem vorgegebenen ersten Bezugspunkt auf einem ersten Körper und einem vorgegebenen zweiten Bezugspunkt auf einem zweiten Körper und Körpervorrichtung |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2123145A1 (de) * | 1970-05-12 | 1971-11-25 | Vyzk Ustav Automatizacznich Pr | Elektrischer, aus Solenoidventilen bestehender Umschalter für pneumatische Signale |
| FR2241008A1 (en) * | 1973-08-17 | 1975-03-14 | Tech Haute Precision | Electro-magnetic petrol injector with rapid action - has accurately controlled annular fuel passage |
| FR2409818A1 (fr) * | 1977-11-29 | 1979-06-22 | Itt | Procede pour lier deux elements en forme de bague |
| US4311280A (en) * | 1980-07-21 | 1982-01-19 | General Motors Corporation | Electromagnetic fuel injector with adjustable armature spring |
| FR2532005A1 (fr) * | 1982-08-18 | 1984-02-24 | Alfa Romeo Auto Spa | Electro-injecteur pour moteurs a combustion interne |
| EP0172591A1 (fr) * | 1984-07-12 | 1986-02-26 | WEBER S.r.l. | Electro-injecteur pour l'alimentation en combustible d'une machine à combustion interne |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4423841A (en) * | 1982-01-28 | 1984-01-03 | General Motors Corporation | Electromagnetic fuel injector with pivotable armature stop |
-
1985
- 1985-09-19 IT IT22206/85A patent/IT1185353B/it active
-
1986
- 1986-09-16 DE DE8686201589T patent/DE3673731D1/de not_active Expired - Fee Related
- 1986-09-16 EP EP86201589A patent/EP0215527B1/fr not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2123145A1 (de) * | 1970-05-12 | 1971-11-25 | Vyzk Ustav Automatizacznich Pr | Elektrischer, aus Solenoidventilen bestehender Umschalter für pneumatische Signale |
| FR2241008A1 (en) * | 1973-08-17 | 1975-03-14 | Tech Haute Precision | Electro-magnetic petrol injector with rapid action - has accurately controlled annular fuel passage |
| FR2409818A1 (fr) * | 1977-11-29 | 1979-06-22 | Itt | Procede pour lier deux elements en forme de bague |
| US4311280A (en) * | 1980-07-21 | 1982-01-19 | General Motors Corporation | Electromagnetic fuel injector with adjustable armature spring |
| FR2532005A1 (fr) * | 1982-08-18 | 1984-02-24 | Alfa Romeo Auto Spa | Electro-injecteur pour moteurs a combustion interne |
| EP0172591A1 (fr) * | 1984-07-12 | 1986-02-26 | WEBER S.r.l. | Electro-injecteur pour l'alimentation en combustible d'une machine à combustion interne |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996041947A1 (fr) * | 1995-06-08 | 1996-12-27 | Siemens Automotive Corporation | Procede d'ajustage d'un entrefer d'un electro-aimant |
| EP0781915A1 (fr) * | 1995-12-26 | 1997-07-02 | General Motors Corporation | Injecteur de carburant |
| WO1999032785A1 (fr) * | 1997-12-23 | 1999-07-01 | Siemens Automotive Corporation | Injecteur de carburant a soupape a bille |
| RU2142062C1 (ru) * | 1997-12-23 | 1999-11-27 | ООО "Прецизика-сервис", Сухан Федор Федорович | Электромагнитная форсунка для двигателя внутреннего сгорания |
| US6047907A (en) * | 1997-12-23 | 2000-04-11 | Siemens Automotive Corporation | Ball valve fuel injector |
| US6655608B2 (en) * | 1997-12-23 | 2003-12-02 | Siemens Automotive Corporation | Ball valve fuel injector |
| RU2161722C2 (ru) * | 1999-01-05 | 2001-01-10 | ООО "Прецизика-сервис" | Электромагнитная форсунка для двигателя внутреннего сгорания |
| RU2187686C2 (ru) * | 2000-05-17 | 2002-08-20 | ООО "Прецизика-сервис" | Электромагнитная форсунка для двигателя внутреннего сгорания |
| DE102005015409B4 (de) | 2005-04-04 | 2019-01-03 | Continental Automotive Gmbh | Verfahren und Vorrichtung zur Vorgabe eines Abstands zwischen einem vorgegebenen ersten Bezugspunkt auf einem ersten Körper und einem vorgegebenen zweiten Bezugspunkt auf einem zweiten Körper und Körpervorrichtung |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0215527B1 (fr) | 1990-08-29 |
| IT1185353B (it) | 1987-11-12 |
| DE3673731D1 (de) | 1990-10-04 |
| IT8522206A0 (it) | 1985-09-19 |
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