EP0279267A1 - Valve control device - Google Patents

Valve control device Download PDF

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Publication number
EP0279267A1
EP0279267A1 EP19880101417 EP88101417A EP0279267A1 EP 0279267 A1 EP0279267 A1 EP 0279267A1 EP 19880101417 EP19880101417 EP 19880101417 EP 88101417 A EP88101417 A EP 88101417A EP 0279267 A1 EP0279267 A1 EP 0279267A1
Authority
EP
European Patent Office
Prior art keywords
valve
piston
control device
housing
valve body
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
Application number
EP19880101417
Other languages
German (de)
French (fr)
Other versions
EP0279267B1 (en
Inventor
Michael Dipl.-Ing. Zipprath
Dieter Schmidt
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.)
INA Waelzlager Schaeffler OHG
Original Assignee
INA Waelzlager Schaeffler OHG
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Publication date
Application filed by INA Waelzlager Schaeffler OHG filed Critical INA Waelzlager Schaeffler OHG
Publication of EP0279267A1 publication Critical patent/EP0279267A1/en
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Publication of EP0279267B1 publication Critical patent/EP0279267B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/245—Hydraulic tappets
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • F02M59/468—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means using piezoelectric operating means
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7771—Bi-directional flow valves
    • Y10T137/7772—One head and seat carried by head of another
    • Y10T137/7774—Supporting valve spring carried by supporting valve

Definitions

  • the invention relates to a control device for a valve arranged on a fuel injection line of an internal combustion engine, which valve is closed in order to build up an injection pressure at an injection nozzle, wherein a play compensation element is arranged between a valve body of the valve and a drive member.
  • the drive element for example electronically controlled, emits a force-displacement pulse.
  • the valve which is located in a fuel return line, is closed.
  • the play compensation element is provided for play-free power transmission between the drive member and the valve body.
  • the object of the invention is to propose a control device of the type mentioned at the outset, in which the compensating element has high rigidity and low moving masses, without being filled with fuel.
  • the above object is achieved in a control device of the type mentioned at the outset in that the compensating element has two pistons guided in a housing, that the first piston is acted upon by the drive member and the second piston acts on the valve body and that an oil-filled pressure chamber is located between the pistons in the housing is formed, which is sealed against the valve and in which a pressure spring acting on the piston is arranged.
  • the compression spring presses the first piston against the drive member without play and the second piston against the valve body in the open position.
  • the drive member presses on the first piston.
  • the second piston which acts on the valve body in such a way that the valve closes, is moved over the oil filling.
  • the oil filling ensures high rigidity of the drive.
  • the oil filling of the pressure chamber can be selected independently of the diesel fuel according to the necessary properties with regard to the viscosity and the temperature behavior.
  • the pistons have a low mass compared to the housing. This improves the dynamic properties of the overall system.
  • an oil reservoir is formed in the housing, to which the leak gaps between the pistons and their guides in the housing are open, and a check valve is arranged between the oil reservoir and the pressure chamber oil enters the pressure chamber when the pressure is released. This ensures that the pressure chamber remains oil-filled despite oil losses through the leakage gaps.
  • FIG. 1 shows a compensating element arranged on a valve in partial section.
  • a valve body (2) is slidably mounted in a valve housing (1).
  • a valve seat (3) is formed between the valve body (2) and the valve housing (1).
  • the valve body (2) is shown in its open position, in which it is pressed against a stop ring (5) by means of a compression spring (4).
  • the valve seat (3) forms a liquid passage.
  • the stroke of the valve body (2) is less than 1 mm.
  • the valve body (2) has a cylindrical guide surface (6), the diameter of which is approximately the same as the diameter of the valve seat (3).
  • a circumferential recess (7) is formed on the valve body (2) between the guide surface (6) and the valve seat (3) and is open to an annular channel (8) of the valve housing (1).
  • a bore (9) opens into the annular channel (8).
  • An outlet (10) is provided on the side of the valve seat (3) facing away from the annular channel (8).
  • the bore (9) is connected to a fuel injection line leading from an injection pump to the injection nozzle of a cylinder of an internal combustion engine.
  • the outlet (10) leads back to the suction side of the injection pump.
  • the valve body (2) has a pressure compensation bore (12) that is open to the interior (11) of the stop ring (5). Fuel can collect in the interior (11).
  • a housing (13) of a compensating element (14) is attached to the stop ring (5) opposite the valve housing (1).
  • a first piston (15) is guided in the housing (13).
  • a non-return valve (16) consisting of a retaining cap (17) and a valve ball (19) which is supported thereon by a closing spring (18), is arranged on this.
  • a ball seat (20) of a hollow (21) of the first piston (15) is assigned to the valve ball (lg).
  • a second piston (22) is also made, which consists of solid material and is formed by a ground needle, as is known from needle bearings.
  • An oil-filled pressure chamber (23) is formed between the first piston (15) and the second piston (22).
  • a pressure spring (24) is arranged in the pressure chamber (23) and is supported on the one hand by the edge of the retaining cap (17) on the first piston (15) and on the other hand by an intermediate plate (25) on the second piston (22).
  • the diameter of the first piston (15) is larger than the diameter of the second piston (22).
  • the leak gap (26) is open to an annular space (28) which is connected to the cavity (21) via a passage (29).
  • the leakage gap (27) is open to an annular space (30) which is connected to the through at least one bore (31) Annulus (28) is connected.
  • the cavity (21), the annular spaces (28,30) and the bore (31) together form an oil-filled oil storage space.
  • the pistons (15, 22) are designed to be as long as possible in relation to the available installation space.
  • the length of the second piston (22) is greater than its diameter.
  • the annular space (30) is sealed off from the interior (11) by means of a membrane arrangement (32).
  • the membrane arrangement (32) has a plate (33) which lies between the second piston (22) and the valve body (2).
  • the plate (33) is provided on its circumference with a groove (34) which is partially circular in cross section.
  • An elastic ring (36) made of rubber is vulcanized to the groove (34) and its edges (35). A comparatively large connecting area between the plate (33) and the ring (36) is achieved.
  • the elastic ring (36) is vulcanized on its outer circumference to a sleeve (37). This sits in a press fit in a bore (38) of the housing (13).
  • the annular space (28) is sealed off from the environment with a similar membrane arrangement (39).
  • the membrane arrangement (39) has a plate (40) with a groove (41) which is semicircular in cross section.
  • An elastic ring (43) made of rubber is vulcanized to these and their edges (42).
  • the outer circumference of the ring (43) is vulcanized to a sleeve (44) which is press-fitted into a bore (45) in the housing (13).
  • the plate (40) is provided with a filling opening (46) for oil, which is closed with a stopper (47).
  • the plate (40) abuts the first piston (15). On its side facing away from this lies the drive member, not shown.
  • the elastic rings (36, 43) can also be formed from plastic parts or sheet metal parts.
  • the injection pump pumps fuel through the bore (9), the annular channel (8), the circumferential recess (7), the valve seat (3) and the outlet (10).
  • the associated injector is closed.
  • the compression spring (4) keeps the valve seat (3) open.
  • the pressure chamber (23) and the oil reservoir are filled with oil.
  • the first piston (15) is free of play via the plate (40) to the drive member and the second piston (22) is free of play via the plate (33) pressed against the valve body (2).
  • the drive member If the drive member is now actuated, it moves the first piston (15) over the plate (40). This displaces the oil in the pressure chamber (23). As a result, the second piston (22) is offset in accordance with the translation. He presses against the force of the compression spring (4) on the plate (33) so that the valve seat (3) closes. As a result, the desired pressure builds up in the ring channel (8) and thus also at the injection nozzle.
  • the locking force to be transmitted for the valve seat (3) via the first piston (15), the oil filling of the pressure chamber (23) and the second piston (22) is comparatively low, since the diameter of the valve seat (3) on the one hand of the ring channel (8) and the diameter of the guide surface (6) on the other hand of the ring channel (8) are substantially the same size.
  • valve body (2) As long as the valve body (2) is kept in the closed position is, oil leaks from the pressure chamber (23) into the annular spaces (28, 30) via the leakage gaps (26, 27). However, the closed position of the valve seat (3) is maintained.
  • the compression spring (4) can press back the second piston (22) and thereby the first piston (15) with the plate (40) via the plate (33).
  • the plate (40) remains in contact with the drive member.
  • the compression spring (24) can relax further, which is associated with an increase in volume of the pressure chamber (23). This creates a negative pressure in relation to the oil reservoir.
  • the valve ball (19) lifts off the ball seat (20) so that oil is refilled into the pressure chamber (23).

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

Abstract

Eine Steuereinrichtung für ein an einer Kraftstoff-Einspritzleitung eines Verbrennungsmotors angeordnetes Ventil weist ein zwischen einem Ventilkörper (2) und einem Antriebsglied angeordnetes Ausgleichselement(14) zum Spielausgleich und zur Kraftubertragung auf. Im Gehäuse(13) des Ausgleichselements sind zwei Kolben(15,22) geführt. Der erste Kolben(15) ist vom Antriebsglied beaufschlagt. Der zweite Kolben(22) beaufschlagt den Ventilkörper(2). Zwischen den Kolben (15,22) ist eine gegenuber dem Ventil abgedichtete, ölgefüllte Druckkammer(23) vorgesehen, in der eine Druckfeder(24) angeordnet ist.A control device for a valve arranged on a fuel injection line of an internal combustion engine has a compensating element (14) arranged between a valve body (2) and a drive element for compensating play and for transmitting power. Two pistons (15, 22) are guided in the housing (13) of the compensating element. The first piston (15) is acted upon by the drive member. The second piston (22) acts on the valve body (2). Between the pistons (15, 22) there is an oil-filled pressure chamber (23) which is sealed off from the valve and in which a compression spring (24) is arranged.

Description

Die Erfindung betrifft eine Steuereinrichtung für ein an einer Kraftstoff-Einspritzleitung eines Verbrennungsmotors angeordnetes Ventil, welches geschlossen wird, um an einer Einspritzdüse einen Einspritzdruck aufzubauen, wobei zwischen einem Ventilkörper des Ventils und einem Antriebsglied ein Spiel-Ausgleichselement angeordnet ist.The invention relates to a control device for a valve arranged on a fuel injection line of an internal combustion engine, which valve is closed in order to build up an injection pressure at an injection nozzle, wherein a play compensation element is arranged between a valve body of the valve and a drive member.

Bei einer derartigen Steuereinrichtung gibt das Antriebsglied, beispielsweise elektronisch gesteuert, einen Kraft-Weg-Impuls ab. Mit diesem Impuls wird das Ventil, das in einer Kraftstoff-Rückführungsleitung liegt, geschlossen. Dadurch baut sich an der Einspritzdüse des betreffenden Zylinders des Verbrennungsmotors ein gewünschter, hoher Einspritzdruck auf. Zur spielfreien Kraftübertragung zwischen dem Antriebsglied und dem Ventilkörper ist das Spiel-Ausgleichselement vorgesehen.In such a control device, the drive element, for example electronically controlled, emits a force-displacement pulse. With this pulse, the valve, which is located in a fuel return line, is closed. As a result, a desired, high injection pressure builds up on the injection nozzle of the relevant cylinder of the internal combustion engine. The play compensation element is provided for play-free power transmission between the drive member and the valve body.

Aufgabe der Erfindung ist es, eine Steuereinrichtung der eingangs genannten Art vorzuschlagen, bei der das Ausgleichselement eine hohe Steifigkeit und geringe bewegte Massen aufweist, ohne mit Kraftstoff gefüllt zu sein.The object of the invention is to propose a control device of the type mentioned at the outset, in which the compensating element has high rigidity and low moving masses, without being filled with fuel.

Erfindungsgemäß ist obige Aufgabe bei einer Steuereinrichtung der eingangs genannten Art dadurch gelöst, daß das Ausgleichselement zwei in einem Gehäuse geführte Kolben aufweist, daß der erste Kolben vom Antriebsglied beaufschlagt ist und der zweite Kolben den Ventilkörper beaufschlagt und daß zwischen den Kolben im Gehäuse eine ölgefüllte Druckkammer ausgebildet ist, die gegenüber dem Ventil abgedichtet ist und in der eine auf die Kolben wirkende Druckfeder angeordnet ist.According to the invention, the above object is achieved in a control device of the type mentioned at the outset in that the compensating element has two pistons guided in a housing, that the first piston is acted upon by the drive member and the second piston acts on the valve body and that an oil-filled pressure chamber is located between the pistons in the housing is formed, which is sealed against the valve and in which a pressure spring acting on the piston is arranged.

Die Druckfeder drückt den ersten Kolben spielfrei gegen das Antriebsglied und den zweiten Kolben gegen den in Öffnungsstellung stehenden Ventilkörper. Zum Schließen des Ventils drückt das Antriebsglied auf den ersten Kolben. Über die Ölfüllung wird dadurch der zweite Kolben verschoben, der den Ventilkörper so beaufschlagt, daß das Ventil schließt. Durch die Ölfüllung ist eine hohe Steifigkeit des Antriebs gewährleistet. Insbesondere ist günstig, daß die Ölfüllung der Druckkammer unabhängig vom Dieselkraftstoff nach den notwendigen Eigenschaften hinsichtlich der Viskosität und dem Temperaturverhalten ausgewählt werden kann.The compression spring presses the first piston against the drive member without play and the second piston against the valve body in the open position. To close the valve, the drive member presses on the first piston. As a result, the second piston, which acts on the valve body in such a way that the valve closes, is moved over the oil filling. The oil filling ensures high rigidity of the drive. In particular, it is favorable that the oil filling of the pressure chamber can be selected independently of the diesel fuel according to the necessary properties with regard to the viscosity and the temperature behavior.

Die Kolben weisen eine im Vergleich zum Gehäuse geringe Masse auf. Dies verbessert die dynamischen Eigenschaften des Gesamtsystems.The pistons have a low mass compared to the housing. This improves the dynamic properties of the overall system.

Durch eine unterschiedliche Gestaltung der Durchmesser der beiden Kolben ist es möglich, eine Übersetzung oder eine Untersetzung des Hubs des Antriebsgliedes zu erreichen.By designing the diameters of the two pistons differently, it is possible to achieve a translation or a reduction in the stroke of the drive member.

In bevorzugter Ausgestaltung der Erfindung ist im Gehäuse ein Ölvorratsraum ausgebildet, zu dem die zwischen den Kolben und deren Führungen im Gehäuse bestehenden Leckspalte offen sind, und zwischen dem Ölvorratsraum und dem Druckraum ist ein Rückschlagventil angeordnet, durch das bei einer Entspannung Öl in den Druckraum eintritt. Dadurch ist gewährleistet, daß trotz Ölverlusten über die Leckspalte der Druckraum ölgefüllt bleibt.In a preferred embodiment of the invention, an oil reservoir is formed in the housing, to which the leak gaps between the pistons and their guides in the housing are open, and a check valve is arranged between the oil reservoir and the pressure chamber oil enters the pressure chamber when the pressure is released. This ensures that the pressure chamber remains oil-filled despite oil losses through the leakage gaps.

Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen und der folgenden Beschreibung eines Ausführungsbeispiels. Die Figur zeigt ein an einem Ventil angeordnetes Ausgleichselement im Teilschnitt.Further advantageous refinements of the invention result from the subclaims and the following description of an exemplary embodiment. The figure shows a compensating element arranged on a valve in partial section.

In einem Ventilgehäuse(1) ist ein Ventilkörper(2) verschieblich gelagert. Zwischen dem Ventilkörper(2) und dem Ventilgehäuse(1) ist ein Ventilsitz(3) ausgebildet. In der Figur ist der Ventilkörper(2) in seiner Öffnungsstellung gezeigt, in der er mittels einer Druckfeder(4) gegen einen Anschlagring(5) gedrückt ist. Der Ventilsitz(3) bildet dabei einen Flüssigkeitsdurchlaß. Der Hub des Ventilkörpers(2) ist kleiner als 1 mm.A valve body (2) is slidably mounted in a valve housing (1). A valve seat (3) is formed between the valve body (2) and the valve housing (1). In the figure, the valve body (2) is shown in its open position, in which it is pressed against a stop ring (5) by means of a compression spring (4). The valve seat (3) forms a liquid passage. The stroke of the valve body (2) is less than 1 mm.

Der Ventilkörper(2) weist eine zylindrische Führungsfläche(6) auf, deren Durchmesser etwa dem Durchmesser des Ventilsitzes(3) gleich ist. Zwischen der Führungsfläche(6) und dem Ventilsitz(3) ist am Ventilkörper(2) eine Umfangsausnehmung(7) ausgebildet, die zu einem Ringkanal(8) des Ventilgehäuses(1) offen ist. In den Ringkanal(8) mündet eine Bohrung(9). An der dem Ringkanal(8) abgewandten Seite des Ventilsitzes(3) ist ein Auslaß(10) vorgesehen.The valve body (2) has a cylindrical guide surface (6), the diameter of which is approximately the same as the diameter of the valve seat (3). A circumferential recess (7) is formed on the valve body (2) between the guide surface (6) and the valve seat (3) and is open to an annular channel (8) of the valve housing (1). A bore (9) opens into the annular channel (8). An outlet (10) is provided on the side of the valve seat (3) facing away from the annular channel (8).

Die Bohrung(9) ist an eine von einer Einspritzpumpe zur Einspritzdüse eines Zylinders eines Verbrennungsmotors führende Kraftstoff-Einspritzleitung angeschlossen. Der Auslaß(10) führt zur Ansaugseite der Einspritzpumpe zurück. Solange der Ventilkörper(2) in seiner Öffnungsstellung steht, besteht an der Einspritzdüse kein zum Einspritzen hinreichender Druck. Wird der Ventilkörper(2) in seine Schließstellung gebracht, dann baut sich an der Einspritzdüse ein gewünschter, hoher Einspritzdruck, von beispielsweise 1000 bar auf.The bore (9) is connected to a fuel injection line leading from an injection pump to the injection nozzle of a cylinder of an internal combustion engine. The outlet (10) leads back to the suction side of the injection pump. As long as the valve body (2) is in its open position, there is no sufficient pressure at the injection nozzle to inject. Will the When the valve body (2) is brought into its closed position, a desired, high injection pressure of, for example, 1000 bar builds up on the injection nozzle.

Der Ventilkörper(2) weist eine zum Innenraum(11) des Anschlagrings(5) offene Druckausgleichsbohrung(12) auf. In dem Innenraum(11) kann sich Kraftstoff sammeln.The valve body (2) has a pressure compensation bore (12) that is open to the interior (11) of the stop ring (5). Fuel can collect in the interior (11).

An den Anschlagring(5) ist gegenüber dem Ventilgehäuse(1) ein Gehäuse(13) eines Ausgleichselements(14) angesetzt. In dem Gehäuse(13) ist ein erster Kolben(15) geführt. An diesem ist ein Rückschlagventil(l6), bestehend aus einer Haltekappe(17) und einer sich an dieser über eine Schließfeder(18) abstützenden Ventilkugel(19) angeordnet. Der Ventilkugel(lg) ist ein Kugelsitz(20) einer Höhlung(21) des ersten Kolbens(15) zugeordnet.A housing (13) of a compensating element (14) is attached to the stop ring (5) opposite the valve housing (1). A first piston (15) is guided in the housing (13). A non-return valve (16), consisting of a retaining cap (17) and a valve ball (19) which is supported thereon by a closing spring (18), is arranged on this. A ball seat (20) of a hollow (21) of the first piston (15) is assigned to the valve ball (lg).

Im Gehäuse(13) ist außerdem ein zweiter Kolben(22) geführt, der aus Vollmaterial besteht und von einer geschliffenen Nadel, wie sie von Nadellagern bekannt ist, gebildet ist.In the housing (13) a second piston (22) is also made, which consists of solid material and is formed by a ground needle, as is known from needle bearings.

Zwischen dem ersten Kolben(15) und dem zweiten Kolben(22) ist eine ölgefüllte Druckkammer(23) ausgebildet. In der Druckkammer(23) ist eine Druckfeder(24) angeordnet, die sich einerseits über den Rand der Haltekappe(17) am ersten Kolben(15) und andererseits über eine Zwischenplatte(25) am zweiten Kolben(22) abstützt. Der Durchmesser des ersten Kolbens(15) ist größer als der Durchmesser des zweiten Kolbens(22).An oil-filled pressure chamber (23) is formed between the first piston (15) and the second piston (22). A pressure spring (24) is arranged in the pressure chamber (23) and is supported on the one hand by the edge of the retaining cap (17) on the first piston (15) and on the other hand by an intermediate plate (25) on the second piston (22). The diameter of the first piston (15) is larger than the diameter of the second piston (22).

Zwischen dem ersten Kolben(15) und dem Gehäuse(13) besteht ein Leckspalt(26). Zwischen dem zweiten Kolben(22) und dem Gehäuse(13) besteht ein Leckspalt (27). Der Leckspalt(26) ist zu einem Ringraum(28) offen, der über einen Durchgang(29) mit der Höhlung(21) verbunden ist. Der Leckspalt(27) ist zu einem Ringraum(30) hin offen, der über wenigstens eine Bohrung(31) mit dem Ringraum(28) in Verbindung steht. Die Höhlung(21), die Ringräume(28,30) und die Bohrung(31) bilden gemeinsam einen ölgefüllten Ölvorratsraum.There is a leakage gap (26) between the first piston (15) and the housing (13). There is a leakage gap (27) between the second piston (22) and the housing (13). The leak gap (26) is open to an annular space (28) which is connected to the cavity (21) via a passage (29). The leakage gap (27) is open to an annular space (30) which is connected to the through at least one bore (31) Annulus (28) is connected. The cavity (21), the annular spaces (28,30) and the bore (31) together form an oil-filled oil storage space.

Um den Öldurchtritt durch die Leckspalte(26,27) möglichst gering zu halten, sind einerseits enge Passungen vorgesehen. Andererseits sind die Kolben(15,22) bezogen auf den zur Verfügung stehenden Bauraum möglichst lang ausgelegt. Die Länge des zweiten Kolbens(22) ist größer als dessen Durchmesser.In order to keep the oil passage through the leakage gaps (26, 27) as low as possible, close fits are provided on the one hand. On the other hand, the pistons (15, 22) are designed to be as long as possible in relation to the available installation space. The length of the second piston (22) is greater than its diameter.

Der Ringraum(30) ist gegenüber dem Innenraum(11) mittels einer Membrananordnung(32) abgedichtet. Die Membrananordnung(32) weist eine Platte(33) auf, die zwischen dem zweiten Kolben(22) und dem Ventilkörper(2) liegt. Die Platte(33) ist an ihrem Umfang mit einer im Querschnitt teilkreisförmigen Rille(34) versehen. An die Rille(34) und deren Ränder(35) ist ein elastischer Ring(36) aus Gummi vulkanisiert. Es ist dabei eine vergleichsweise große Verbindungsfläche zwischen der Platte(33) und dem Ring(36) erreicht. Der elastische Ring(36) ist an seinem Außenumfang an eine Hülse(37) vulkanisiert. Diese sitzt in Preßpassung in einer Bohrung(38) des Gehäuses(13).The annular space (30) is sealed off from the interior (11) by means of a membrane arrangement (32). The membrane arrangement (32) has a plate (33) which lies between the second piston (22) and the valve body (2). The plate (33) is provided on its circumference with a groove (34) which is partially circular in cross section. An elastic ring (36) made of rubber is vulcanized to the groove (34) and its edges (35). A comparatively large connecting area between the plate (33) and the ring (36) is achieved. The elastic ring (36) is vulcanized on its outer circumference to a sleeve (37). This sits in a press fit in a bore (38) of the housing (13).

Der Ringraum(28) ist mit einer ähnlichen Membrananordnung(39) gegenüber der Umgebung abgedichtet. Die Membrananordnung(39) weist eine Platte(40) mit einer im Querschnitt halbkreisförmigen Rille(41) auf. An diese und deren Ränder(42) ist ein elastischer Ring(43) aus Gummi vulkanisiert. Der Außenumfang des Rings(43) ist an eine Hülse(44) vulkanisiert, die in Preßpassung in eine Bohrung(45) des Gehäuses(13) eingesetzt ist. Die Platte(40) ist mit einer Einfüllöffnung(46) für Öl versehen, die mit einem Stopfen(47) verschlossen ist. Die Platte(40) liegt an dem ersten Kolben(15) an. An ihrer diesem abgewandten Seite liegt das nicht näher dargestellte Antriebsglied an.The annular space (28) is sealed off from the environment with a similar membrane arrangement (39). The membrane arrangement (39) has a plate (40) with a groove (41) which is semicircular in cross section. An elastic ring (43) made of rubber is vulcanized to these and their edges (42). The outer circumference of the ring (43) is vulcanized to a sleeve (44) which is press-fitted into a bore (45) in the housing (13). The plate (40) is provided with a filling opening (46) for oil, which is closed with a stopper (47). The plate (40) abuts the first piston (15). On its side facing away from this lies the drive member, not shown.

Die elastischen Ringe(36,43) können auch von Kunststoffteilen oder Blechteilen gebildet sein.The elastic rings (36, 43) can also be formed from plastic parts or sheet metal parts.

Die Funktionsweise der beschriebenen Einrichtung ist ausgehend von der in der Figur dargestellten Stellung etwa folgende:Starting from the position shown in the figure, the functioning of the described device is approximately as follows:

Durch die Bohrung(9), den Ringkanal(8), die Umfangsausnehmung(7), den Ventilsitz(3) und den Auslaß(10) wird von der Einspritzpumpe Kraftstoff gepumpt. Die zugehörige Einspritzdüse ist dabei geschlossen. Die Druckfeder(4) hält den Ventilsitz(3) offen. Die Druckkammer(23) und der Ölvorratsraum sind ölgefüllt. Unter der Wirkung der Druckfeder(24), die schwächer ist als die Druckfeder(4), ist der erste Kolben(15) über die Platte(40) spielfrei an das Antriebsglied und der zweite Kolben(22) spielfrei über die Platte(33) an den Ventilkörper(2) gedrückt.The injection pump pumps fuel through the bore (9), the annular channel (8), the circumferential recess (7), the valve seat (3) and the outlet (10). The associated injector is closed. The compression spring (4) keeps the valve seat (3) open. The pressure chamber (23) and the oil reservoir are filled with oil. Under the action of the compression spring (24), which is weaker than the compression spring (4), the first piston (15) is free of play via the plate (40) to the drive member and the second piston (22) is free of play via the plate (33) pressed against the valve body (2).

Wird nun das Antriebsglied betätigt, dann verschiebt es über die Platte(40) den ersten Kolben(15). Dieser verdrängt das Öl der Druckkammer(23). Dadurch wird der zweite Kolben(22) der Übersetzung entsprechend versetzt. Er drückt entgegen der Kraft der Druckfeder(4) so auf die Platte(33), daß der Ventilsitz(3) schließt. Dadurch baut sich im Ringkanal(8) und damit auch an der Einspritzdüse der gewünschte Druck auf.If the drive member is now actuated, it moves the first piston (15) over the plate (40). This displaces the oil in the pressure chamber (23). As a result, the second piston (22) is offset in accordance with the translation. He presses against the force of the compression spring (4) on the plate (33) so that the valve seat (3) closes. As a result, the desired pressure builds up in the ring channel (8) and thus also at the injection nozzle.

Die über den ersten Kolben(15), die Ölfüllung der Druckkammer(23) und den zweiten Kolben(22) zu übertragende Zuhaltekraft für den Ventilsitz(3) ist vergleichsweise gering, da der Durchmesser des Ventilsitzes(3) einerseits des Ringkanals(8) und der Durchmesser der Führungsfläche(6) andererseits des Ringkanals(8) im wesentlichen gleich groß sind.The locking force to be transmitted for the valve seat (3) via the first piston (15), the oil filling of the pressure chamber (23) and the second piston (22) is comparatively low, since the diameter of the valve seat (3) on the one hand of the ring channel (8) and the diameter of the guide surface (6) on the other hand of the ring channel (8) are substantially the same size.

Solange der Ventilkörper(2) in Schließstellung gehalten ist, tritt über die Leckspalte(26,27) Öl aus der Druckkammer(23) in die Ringräume(28,30). Die Schließstellung des Ventilsitzes(3) bleibt jedoch aufrechterhalten.As long as the valve body (2) is kept in the closed position is, oil leaks from the pressure chamber (23) into the annular spaces (28, 30) via the leakage gaps (26, 27). However, the closed position of the valve seat (3) is maintained.

Schaltet das Antriebsglied ab, dann kann die Druckfeder(4) über die Platte(33) den zweiten Kolben(22) und dadurch den ersten Kolben(15) mit der Platte(40) zurückdrücken. Die Platte(40) bleibt dabei in Anlage am Antriebsglied.If the drive element switches off, the compression spring (4) can press back the second piston (22) and thereby the first piston (15) with the plate (40) via the plate (33). The plate (40) remains in contact with the drive member.

Sobald der Ventilkörper(2) am Anschlagring(5) anschlägt, kann sich die Druckfeder(24) weiter entspannen, was mit einer Volumenvergrößerung der Druckkammer(23) verbunden ist. Dadurch entsteht in dieser ein Unterdruck gegenüber dem Ölvorratsraum. Die Ventilkugel (19) hebt dabei vom Kugelsitz(20) ab, so daß in die Druckkammer(23) Öl nachgefüllt wird.As soon as the valve body (2) strikes the stop ring (5), the compression spring (24) can relax further, which is associated with an increase in volume of the pressure chamber (23). This creates a negative pressure in relation to the oil reservoir. The valve ball (19) lifts off the ball seat (20) so that oil is refilled into the pressure chamber (23).

Claims (8)

1. Steuereinrichtung für ein an einer Kraftstoff­Einspritzleitung eines Verbrennungsmotors angeordnetes Ventil, welches geschlossen wird, um an einer Einspritzdüse einen Einspritzdruck aufzubauen, wobei zwischen einem Ventilkörper des Ventils und einem Antriebsglied ein Spiel-Ausgleichselement angeordnet ist, dadurch gekennzeichnet, daß das Ausgleichselement(14) zwei in einem Gehäuse(13) geführte Kolben(15,22) aufweist, daß der erste Kolben(15) vom Antriebsglied beaufschlagt ist und der zweite Kolben(22) den Ventilkörper beaufschlagt und daß zwischen den Kolben(15,22) im Gehäuse(13) eine ölgefüllte Druckkammer(23) ausgebildet ist, die gegenüber dem Ventil(1,2) abgedichtet ist und in der eine auf die Kolben(15,22) wirkende Druckfeder(24) angeordnet ist.1. Control device for a valve arranged on a fuel injection line of an internal combustion engine, which is closed in order to build up an injection pressure at an injection nozzle, wherein a play compensation element is arranged between a valve body of the valve and a drive member, characterized in that the compensation element (14) has two pistons (15, 22) guided in a housing (13), that the first piston (15) is acted upon by the drive member and the second piston (22) acts on the valve body and that between the pistons (15, 22) in the housing ( 13) an oil-filled pressure chamber (23) is formed, which is sealed off from the valve (1, 2) and in which a compression spring (24) acting on the pistons (15, 22) is arranged. 2. Steuereinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß im Gehäuse(13) ein Ölvorratsraum(28,30,31) ausgebildet ist, zu dem die zwischen den Kolben(15,22) und deren Führungen im Gehäuse(13) bestehenden Leckspalte(26,27) offen sind, und daß zwischen dem Ölvorratsraum(28,30,31) und der Druckkammer(23) ein Rückschlagventil(16) angeordnet ist, durch das bei einer Entspannung der Druckfeder(24) Öl in die Druckkammer(23) eintritt.2. Control device according to claim 1, characterized in that in the housing (13) an oil reservoir (28,30,31) is formed, to which the existing between the pistons (15,22) and their guides in the housing (13) existing leakage gaps ( 26, 27) are open, and that a check valve (16) is arranged between the oil reservoir (28, 30, 31) and the pressure chamber (23), through which oil is released into the pressure chamber (23) when the pressure spring (24) is released. entry. 3. Steuereinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Druckfeder(24) schwächer ausgebildet ist als eine den Ventilkörper(2) in seine Öffnungsstellung verschiebende Feder(4).3. Control device according to claim 1 or 2, characterized in that the compression spring (24) is weaker than a valve body (2) in its open position shifting spring (4). 4. Steuereinrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Ventilkörper(2) in seiner Öffnungsstellung so anschlägt, daß für die Druckfeder(24) ein Resthub zur Entspannung verbleibt.4. Control device according to one of the preceding claims, characterized in that the Valve body (2) strikes in its open position so that a residual stroke remains for relaxation for the compression spring (24). 5. Steuereinrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Rückschlagventil (16) am ersten Kolben(15) angeordnet ist.5. Control device according to one of the preceding claims, characterized in that the check valve (16) is arranged on the first piston (15). 6. Steuereinrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Länge des zweiten Kolbens(22) größer als dessen Durchmesser ist.6. Control device according to one of the preceding claims, characterized in that the length of the second piston (22) is greater than its diameter. 7. Steuereinrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Ölvorratsraum(28,30,31) gegen das Ventil(1,2) abgedichtet ist.7. Control device according to one of the preceding claims, characterized in that the oil reservoir (28,30,31) is sealed against the valve (1,2). 8. Steuereinrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Ölvorratsraum(28,30,31) beidseitig mit einer Membrananordnung(32,39) abgeschlossen ist, die eine an dem ersten bzw zweiten Kolben(15,22) anliegende Platte(33,40) aufweist, die von einem elastischen Ring(36,43) umschlossen ist, der an einer Hülse(37,44) befestigt ist, die in Preßpassung im Gehäuse(13) sitzt.8. Control device according to one of the preceding claims, characterized in that the oil reservoir (28, 30, 31) is closed on both sides with a membrane arrangement (32, 39), which rests on the first or second piston (15, 22) plate ( 33, 40), which is enclosed by an elastic ring (36, 43), which is fastened to a sleeve (37, 44) which is press-fitted in the housing (13).
EP19880101417 1987-02-14 1988-02-02 Valve control device Expired - Lifetime EP0279267B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3704743 1987-02-14
DE19873704743 DE3704743A1 (en) 1987-02-14 1987-02-14 CONTROL VALVE FOR A VALVE

Publications (2)

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EP0279267A1 true EP0279267A1 (en) 1988-08-24
EP0279267B1 EP0279267B1 (en) 1991-07-03

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EP19880101417 Expired - Lifetime EP0279267B1 (en) 1987-02-14 1988-02-02 Valve control device

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US (1) US4840160A (en)
EP (1) EP0279267B1 (en)
JP (1) JPS63201367A (en)
DE (2) DE3704743A1 (en)
ES (1) ES2022930B3 (en)

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US5463996A (en) * 1994-07-29 1995-11-07 Caterpillar Inc. Hydraulically-actuated fluid injector having pre-injection pressurizable fluid storage chamber and direct-operated check
US6082332A (en) * 1994-07-29 2000-07-04 Caterpillar Inc. Hydraulically-actuated fuel injector with direct control needle valve
US5687693A (en) * 1994-07-29 1997-11-18 Caterpillar Inc. Hydraulically-actuated fuel injector with direct control needle valve
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Also Published As

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EP0279267B1 (en) 1991-07-03
JPS63201367A (en) 1988-08-19
DE3863439D1 (en) 1991-08-08
DE3704743A1 (en) 1988-08-25
ES2022930B3 (en) 1991-12-16
US4840160A (en) 1989-06-20

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