WO2002044546A1 - Control chamber and control plunger for an injection valve of an internal combustion engine - Google Patents
Control chamber and control plunger for an injection valve of an internal combustion engine Download PDFInfo
- Publication number
- WO2002044546A1 WO2002044546A1 PCT/DE2001/004160 DE0104160W WO0244546A1 WO 2002044546 A1 WO2002044546 A1 WO 2002044546A1 DE 0104160 W DE0104160 W DE 0104160W WO 0244546 A1 WO0244546 A1 WO 0244546A1
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- WO
- WIPO (PCT)
- Prior art keywords
- control piston
- control
- injector
- recess
- bore
- Prior art date
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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
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
-
- 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
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
Definitions
- the present invention relates to an injector for an internal combustion engine with direct injection according to the preamble of claim 1.
- Such an injector is known for example from EP 0 548 916 B1.
- an inlet throttle above the control piston (if the control piston is in its lowest position in the axial direction) or at the transition outer circumference / end face of the control piston (if the control piston is in its highest position in the axial direction) opens into one above the control piston control space.
- the inlet throttle is arranged in such a way that it opens into a central bore in the injector body that receives the control piston in every position of the control piston in the area of the outer surface of the control piston.
- the opening and closing of the nozzle needle coupled to the control piston is controlled via the control chamber by means of the fuel pressure acting on the control piston.
- the control room includes an inlet and an outlet throttle as standard. The opening and closing characteristics of the nozzle needle are determined by the design of these throttles. In order to avoid dead times and delays when controlling the nozzle needle, the control chamber must be kept small with regard to the fuel oil volume.
- Influence injector characteristics This has an effect above all in the case of manufacturing tolerance-related scattering of the throttling very unfavorable for the spread of the injection quantity when comparing two identical injectors.
- Figure 1 a fuel injector with a leakage connection
- FIG 2 an enlargement of the section designated by A in Figure 1 in section;
- Figure 2a a section corresponding to Figure 2;
- Figure 3 a section corresponding to Figure 2
- annular groove 160 on the outer circumference of the control piston 90 a circumferential recess, for example in the form of an annular groove 160 ′, can be formed in the injector body 50, as shown in FIG. 2a.
- the annular groove 160 ' is arranged in such a way that the inlet throttle 150 opens into it.
- the fuel entering through the inlet throttle 150 can flow around the full control piston circumference via the annular groove 160 and then to the full control piston circumference via the annular gap 130 between the wall 120 of the bore 80 and the control piston outer circumference into the control chamber 140 and further to one Drain throttle 170 flow into which drain throttle 170 the control chamber 140 opens.
- the control room volume can be designed in such a way that only a slight unintentional throttling occurs.
- one or more longitudinal grooves 180 can be formed on the control piston periphery in the region between the annular groove 160 and the end face of the control piston 90 his.
- FIG. 4 shows, there is also the possibility of providing a central bore 190 in the control piston 90, which is connected to the annular groove 160 at the level of the annular groove 160 via one or more transverse bores 200.
- These bores 190, 200 can be provided in addition or as an alternative to the longitudinal grooves 180 in FIG. 3.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention relates to an injector (10) for an internal combustion engine with direct injection. The injector (10) comprises an injector housing (50) with a central bore (80) that extends axially, a control plunger (90) that can be axially displaced in said central bore (80), a nozzle needle that extends through the axial bore (80) and is connected to the control plunger (90), an actuator, a control chamber (140), which is located above the control plunger (90) and defined by the injector housing (50) and said control plunger (90) and input (150) and output throttles (170), which open into the axial bore (80), for supplying and discharging fuel to and from the control chamber (140). The injector (10) is characterised in that a circumferential recess (160;160') is provided in the outer peripheral area of the control plunger (90).
Description
Beschreibung description
STEUERRAUM UND STEUERKOLBEN FÜR EIN EINSPRITZVENTIL EINER BRENNKRAFTMASCHINΞCONTROL SPACE AND CONTROL PISTON FOR AN INJECTION VALVE OF AN INTERNAL COMBUSTION ENGINE
Die vorliegende Erfindung betrifft einen Injektor für eine Brennkraftmaschine mit Direkteinspritzung gemäß, dem Oberbegriff von Patentanspruch 1.The present invention relates to an injector for an internal combustion engine with direct injection according to the preamble of claim 1.
Ein derartiger Injektor ist beispielsweise aus der EP 0 548 916 Bl bekannt. Bei diesem Injektor mündet eine Zulaufdrossel oberhalb des Steuerkolbens (wenn der Steuerkolben in seiner in Achsrichtung untersten Position ist) bzw. am Ü- bergang Außenumfang/Stirnfläche des Steuerkolbens (wenn der Steuerkolben in seiner in Achsrichtung obersten Position ist) in einen oberhalb des Steuerkolbens angeordneten Steuerraum. Bei einem anderen bekannten Injektor ist die Zulaufdrossel derart angeordnet, dass sie in jeder Position des Steuerkolbens im Bereich der Mantelfläche des Steuerkolbens in eine den Steuerkolben aufnehmende, zentrale Bohrung im Injektor- körper mündet.Such an injector is known for example from EP 0 548 916 B1. In this injector, an inlet throttle above the control piston (if the control piston is in its lowest position in the axial direction) or at the transition outer circumference / end face of the control piston (if the control piston is in its highest position in the axial direction) opens into one above the control piston control space. In another known injector, the inlet throttle is arranged in such a way that it opens into a central bore in the injector body that receives the control piston in every position of the control piston in the area of the outer surface of the control piston.
Bei den bekannten Injektoren für Common-Rail-Diesel- Einspritzsysteme wird das Öffnen und Schließen der mit dem Steuerkolben gekoppelten Düsennadel über den Steuerraum mit- tels des Kraftstoffdrucks, der auf den Steuerkolben wirkt, gesteuert . Der Steuerraum beinhaltet standardmäßig eine Zu- und eine Ablaufdrossel . Durch die Auslegung dieser Drosseln wird die Öffnungs- und Schließcharakteristik der Düsennadel bestimmt. Um Tod- und Verzögerungszeiten bei der Steuerung der Düsennadel zu vermeiden, muss der Steuerraum bezüglich des Kraftstoff olumens klein gehalten werden.In the known injectors for common-rail diesel injection systems, the opening and closing of the nozzle needle coupled to the control piston is controlled via the control chamber by means of the fuel pressure acting on the control piston. The control room includes an inlet and an outlet throttle as standard. The opening and closing characteristics of the nozzle needle are determined by the design of these throttles. In order to avoid dead times and delays when controlling the nozzle needle, the control chamber must be kept small with regard to the fuel oil volume.
Bei der Verfolgung des Ziels eines kleinen Steuerraumvolumens ist darauf zu achten, dass neben Zu- und Ablaufdrosseln keine zusätzlichen ungewollten Drosselstellen entstehen, die dieWhen pursuing the goal of a small control room volume, care must be taken to ensure that, in addition to inlet and outlet throttles, there are no additional undesired throttle points which
Injektorcharakteristik beeinflussen. Dies wirkt sich vor allem bei Fertigungstoleranz bedingter Streuung der Drosselung
sehr ungünstig auf die Streuung der Einspritzmenge beim Vergleich zweier baugleicher Injektoren aus.Influence injector characteristics. This has an effect above all in the case of manufacturing tolerance-related scattering of the throttling very unfavorable for the spread of the injection quantity when comparing two identical injectors.
Es ist deshalb Aufgabe der vorliegenden Erfindung eine unge- wollte Drosselung, speziell, wenn Bauraum bedingt der Kraftstoff über die Zulaufdrossel im Bereich der Mantelfläche des Steuerkolbens in den Steuerraum eintritt, zu vermeiden.It is therefore an object of the present invention to avoid undesired throttling, especially if the fuel enters the control space via the inlet throttle in the region of the outer surface of the control piston, due to installation space.
Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichen des Patentanspruchs 1 genannten Merkmale gelöst. Der Kraftstoff trifft in die Ausnehmung am Steuerkolben, wird um den Steuerkolben herum verteilt und kann auf diese Weise ungehindert den Steuerkolben umströmen, um dann entlang des gesamten Steuerkolbenaußenumfangs herum in den Steuerraum und an- schließend zur Ablaufdrossel zu strömen.This object is achieved by the features mentioned in the characterizing part of patent claim 1. The fuel hits the recess on the control piston, is distributed around the control piston and can flow around the control piston unhindered in order to then flow along the entire outer circumference of the control piston into the control chamber and then to the discharge throttle.
Auf diese Weise ist die Gefahr einer schwer bestimmbaren zusätzlichen Drosselung, die zudem stark abhängig von den Fertigungstoleranzen des Ringspaltes zwischen dem Steuerkolben- außenumfang und der Wand der den Steuerkolben aufnehmenden Bohrung ist, verringert werden.In this way, the risk of an additional throttling that is difficult to determine, which is also strongly dependent on the manufacturing tolerances of the annular gap between the outer circumference of the control piston and the wall of the bore receiving the control piston, is reduced.
Bevorzugte Ausführungsformen der Erfindung sind in den abhängigen Ansprüchen angegeben.Preferred embodiments of the invention are specified in the dependent claims.
Im folgenden wird die Erfindung anhand der beigefügten Zeichnungen näher erläutert. Es zeigen:The invention is explained in more detail below with reference to the accompanying drawings. Show it:
Figur 1: einen KraftstoffInjektor mit Leckageanschluss;Figure 1: a fuel injector with a leakage connection;
Figur 2 : eine Vergrößerung des in der Figur 1 mit A bezeichneten Ausschnitts im Schnitt;Figure 2: an enlargement of the section designated by A in Figure 1 in section;
Figur 2a: ein der Figur 2 entsprechender Ausschnitt;Figure 2a: a section corresponding to Figure 2;
Figur 3: einen Ausschnitt entsprechend Figur 2, und
Figure 3: a section corresponding to Figure 2, and
Alternativ zu der Ringnut 160 am Außenumfang des Steuerkol- bens 90 kann eine umlaufende Ausnehmung, beispielsweise in Form einer Ringnut 160' im Injektorkörper 50 ausgebildet sein, wie Fig. 2a zeigt. Die Ringnut 160' ist dabei derart angeordnet, dass die Zulaufdrossel 150 in sie mündet.As an alternative to the annular groove 160 on the outer circumference of the control piston 90, a circumferential recess, for example in the form of an annular groove 160 ′, can be formed in the injector body 50, as shown in FIG. 2a. The annular groove 160 'is arranged in such a way that the inlet throttle 150 opens into it.
Durch diese Anordnung kann der durch die Zulaufdrossel 150 eintretende Kraftstoff über die Ringnut 160 den vollen Steu- erkolbenumfang umströmen und anschließend auf vollen Steuer- kolbenumfang über den Ringspalt 130 zwischen der Wand 120 der Bohrung 80 und dem Steuerkolbenaußenumfang in den Steuerraum 140 und weiter zu einer Ablaufdrossel 170 strömen, in welche Ablaufdrossel 170 der Steuerraum 140 mündet. Dadurch wird die Gefahr einer schwer bestimmbaren zusätzlichen Drosselung aufgrund von Fertigungstoleranzen des Ringspaltes 130 zwischen dem Steuerkolben 90 und dem Steuerraum 140 verringert. Das Steuerraumvolumen kann dabei derart gestaltet werden, dass nur eine geringe unbeabsichtigte Drosselung auftritt .With this arrangement, the fuel entering through the inlet throttle 150 can flow around the full control piston circumference via the annular groove 160 and then to the full control piston circumference via the annular gap 130 between the wall 120 of the bore 80 and the control piston outer circumference into the control chamber 140 and further to one Drain throttle 170 flow into which drain throttle 170 the control chamber 140 opens. This reduces the risk of additional throttling that is difficult to determine due to manufacturing tolerances of the annular gap 130 between the control piston 90 and the control chamber 140. The control room volume can be designed in such a way that only a slight unintentional throttling occurs.
Im Falle, dass trotz der Ringnut 160 die Drosselung noch zu stark ist, können zusätzlich zu der Ringnut 160, wie in der Figur 3 zu erkennen, am Steuerkolbenumfang eine oder mehrere Längsnuten 180 im Bereich zwischen der Ringnut 160 und der Stirnfläche des Steuerkolbens 90 ausgebildet sein.In the event that the throttling is still too strong despite the annular groove 160, in addition to the annular groove 160, as can be seen in FIG. 3, one or more longitudinal grooves 180 can be formed on the control piston periphery in the region between the annular groove 160 and the end face of the control piston 90 his.
Überdies besteht weiterhin die Möglichkeit, wie die Figur 4 zeigt, im Steuerkolben 90 eine zentrale Bohrung 190 vorzusehen, die in Höhe der Ringnut 160 über eine oder mehrere Quer- bohrungen 200 mit der Ringnut 160 in Verbindung steht. Diese Bohrungen 190,200 können zusätzlich oder alternativ zu den Längsnuten 180 der Figur 3 vorgesehen sein.Furthermore, as FIG. 4 shows, there is also the possibility of providing a central bore 190 in the control piston 90, which is connected to the annular groove 160 at the level of the annular groove 160 via one or more transverse bores 200. These bores 190, 200 can be provided in addition or as an alternative to the longitudinal grooves 180 in FIG. 3.
Eine weitere Variante, die in den Figuren nicht dargestellt ist, um eine zu starke Drosselung zwischen der Zu- 150 und der Ablaufdrossel 170 zu verhindern, besteht darin, die Position von Zu- und Ablaufdrossel zu vertauschen.
Another variant, which is not shown in the figures, in order to prevent excessive throttling between inlet 150 and outlet throttle 170, is to interchange the position of inlet and outlet throttles.
Claims
1. Injektor für eine Brennkraftmaschine mit Direkteinsprit- zung, umfassend ein Injektorgehäuse (50) mit einer zentralen, sich axial erstreckenden Bohrung, einen in der zentralen Bohrung (80) axial verschiebbaren Steuerkolben (90) , eine sich durch die axiale Bohrung (80) erstreckende, mit dem Steuerkolben (90) in Verbindung stehende Düsennadel, einen Aktor, einen oberhalb des Steuerkolbens (90) angeordneten, durch das Injektorgehäuse (50) und den Steuerkolben (90) festgelegten Steuerraum (140) , Zu- (150) und Ablaufdrosseln (170) zum Zu- bzw. Abführen von Kraftstoff in bzw. aus dem Steuerraum (140) , die in die axiale Bohrung (80) münden, dadurch gekennzeichnet, dass im Bereich des Außenumfangs des Steuerkolbens (90) eine umlaufende Ausnehmung (160; 160') vorgesehen ist.1. Injector for an internal combustion engine with direct injection, comprising an injector housing (50) with a central, axially extending bore, a control piston (90) axially displaceable in the central bore (80), a through the axial bore (80) Extending nozzle needle connected to the control piston (90), an actuator, a control chamber (140), inlet (150) and outlet throttles arranged above the control piston (90) and defined by the injector housing (50) and the control piston (90) (170) for supplying and discharging fuel into and out of the control chamber (140) which open into the axial bore (80), characterized in that in the area of the outer circumference of the control piston (90) a circumferential recess (160; 160 ') is provided.
2. Injektor nach Anspruch 1, dadurch gekennzeichnet, dass die Ausnehmung (160') im Injektorgehäuse (50) ausgebildet ist.2. Injector according to claim 1, characterized in that the recess (160 ') is formed in the injector housing (50).
3. Injektor nach Anspruch 1, dadurch gekennzeichnet, dass die Ausnehmung (160) am Außenumfang des Steuerkolbens (90) ausgebildet ist.3. Injector according to claim 1, characterized in that the recess (160) is formed on the outer circumference of the control piston (90).
4. Injektor nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Ausnehmung ein Ringnut (160; 160') ist.4. Injector according to one of claims 1 to 3, characterized in that the recess is an annular groove (160; 160 ').
5. Injektor nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass in einem Bereich zwischen der Ausnehmung (160; 160') und der oberen Stirnfläche des Steuerkolbens (90) wenigstens eine Längsnut (180) am Außenumfang des Steuerkol- bens (90) ausgebildet ist. 5. Injector according to one of claims 1 to 4, characterized in that in a region between the recess (160; 160 ') and the upper end face of the control piston (90) at least one longitudinal groove (180) on the outer circumference of the control piston (90 ) is trained.
6. Injektor nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass eine zentrale Bohrung (80) im Steuerkolben (90) vorgesehen ist, an die sich wenigsten eine Querbohrung (200) anschließt, die in die Ausnehmung (160;160') mündet, derart dass eine Verbindung zwischen der Ausnehmung (160;160') und dem Steuerraum (140) ausgebildet ist.6. Injector according to one of claims 1 to 5, characterized in that a central bore (80) is provided in the control piston (90), to which at least one transverse bore (200) adjoins, which in the recess (160; 160 ') opens in such a way that a connection is formed between the recess (160; 160 ') and the control chamber (140).
7. Injektor nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Zulaufdrossel (150) im Bereich der Ausneh- mung (160; 160') in die zentrale Bohrung (80) mündet, wenn sich der Steuerkolben (90) in seiner obersten Axialposition befindet . 7. Injector according to one of claims 1 to 6, characterized in that the inlet throttle (150) in the region of the recess (160; 160 ') opens into the central bore (80) when the control piston (90) is in its top axial position.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10058989 | 2000-11-28 | ||
| DE10058989.8 | 2000-11-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2002044546A1 true WO2002044546A1 (en) | 2002-06-06 |
Family
ID=7664931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DE2001/004160 WO2002044546A1 (en) | 2000-11-28 | 2001-11-06 | Control chamber and control plunger for an injection valve of an internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2002044546A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2843617A1 (en) * | 2002-08-13 | 2004-02-20 | Bosch Gmbh Robert | I.C. engine fuel injector comprises needle sliding longitudinally in drilling, needle has piston shaped segment and conical end located at combustion chamber side through which needle engages valve seat to open ejection orifice |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5803369A (en) * | 1995-07-26 | 1998-09-08 | Nippondenso Co., Ltd. | Accumulator fuel injection device |
| US5826562A (en) * | 1994-07-29 | 1998-10-27 | Caterpillar Inc. | Piston and barrell assembly with stepped top and hydraulically-actuated fuel injector utilizing same |
| DE19826795A1 (en) * | 1998-06-16 | 1999-12-23 | Bosch Gmbh Robert | Valve control unit for a fuel injector |
| DE19826719A1 (en) * | 1998-06-16 | 1999-12-23 | Bosch Gmbh Robert | Valve control unit for a fuel injector |
| WO2001011222A1 (en) * | 1999-08-04 | 2001-02-15 | Robert Bosch Gmbh | Common rail injector |
-
2001
- 2001-11-06 WO PCT/DE2001/004160 patent/WO2002044546A1/en not_active Application Discontinuation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5826562A (en) * | 1994-07-29 | 1998-10-27 | Caterpillar Inc. | Piston and barrell assembly with stepped top and hydraulically-actuated fuel injector utilizing same |
| US5803369A (en) * | 1995-07-26 | 1998-09-08 | Nippondenso Co., Ltd. | Accumulator fuel injection device |
| DE19826795A1 (en) * | 1998-06-16 | 1999-12-23 | Bosch Gmbh Robert | Valve control unit for a fuel injector |
| DE19826719A1 (en) * | 1998-06-16 | 1999-12-23 | Bosch Gmbh Robert | Valve control unit for a fuel injector |
| WO2001011222A1 (en) * | 1999-08-04 | 2001-02-15 | Robert Bosch Gmbh | Common rail injector |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2843617A1 (en) * | 2002-08-13 | 2004-02-20 | Bosch Gmbh Robert | I.C. engine fuel injector comprises needle sliding longitudinally in drilling, needle has piston shaped segment and conical end located at combustion chamber side through which needle engages valve seat to open ejection orifice |
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