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WO2006106024A1 - Injecteur de carburant pour moteurs a combustion interne - Google Patents

Injecteur de carburant pour moteurs a combustion interne Download PDF

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Publication number
WO2006106024A1
WO2006106024A1 PCT/EP2006/060622 EP2006060622W WO2006106024A1 WO 2006106024 A1 WO2006106024 A1 WO 2006106024A1 EP 2006060622 W EP2006060622 W EP 2006060622W WO 2006106024 A1 WO2006106024 A1 WO 2006106024A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve needle
valve
coupler piston
recess
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.)
Ceased
Application number
PCT/EP2006/060622
Other languages
German (de)
English (en)
Inventor
Andreas Kerst
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 WO2006106024A1 publication Critical patent/WO2006106024A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/004—Actuating devices; Operating means; Releasing devices actuated by piezoelectric means
    • F16K31/007—Piezoelectric stacks
    • 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
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive 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
    • 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
    • F02M61/161—Means for adjusting injection-valve lift
    • 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
    • F02M2200/701—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger mechanical

Definitions

  • the invention is based on a fuel injection valve according to the preamble of patent claim 1.
  • a fuel injection valve is known, for example, from European Patent Application EP 1 174 615 A2 and comprises a valve needle which cooperates with a valve seat for controlling at least one injection opening.
  • the valve needle is in this case arranged to be longitudinally displaceable, so that depending on the longitudinal position of the valve needle, the injection openings are released or closed by installation of the valve needle on the valve seat.
  • an actuator is present, which is formed, for example, as a piezoelectric actuator.
  • the piezoelectric actuator acts at least indirectly on a coupler piston, through which an operative connection between the actuator and the valve needle is made.
  • the fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage over that a simple mechanical coupler is provided between the coupler piston and the valve needle, which allows lifting of the valve needle at the beginning of the opening stroke with the desired precision.
  • the coupler piston on a bolt which projects into a recess of the valve needle.
  • the recess in the valve needle is in this case oriented so that the bolt abuts the valve seat facing away from the upper end of the recess when the valve needle is in contact with the valve seat and the coupler piston has taken its appropriate position at the beginning of the opening stroke.
  • valve needle By moving the coupler piston away from the valve seat, the valve needle is moved until the hydraulic forces, which additionally act on the valve needle by lifting off the valve seat, determine the further opening dynamics of the valve needle. Since the recess allows movement of the bolt within the recess, the further opening stroke of the valve needle is not hindered by the coupler piston, even though the latter has now reached its end position. This can be controlled by a relatively small stroke of the actuator and thus the coupler piston, a large longitudinal movement of the valve needle.
  • the bolt also has the advantage that the valve needle is rotationally fixed, ie that their valve sealing surface always has the same position to the valve seat. This can promote the wear between valve sealing surface 8 and valve seat 11, so that the life of the fuel injection valve increases significantly.
  • the coupler piston has a central recess in which the valve needle is guided with its valve seat facing away from the end.
  • a control space is formed between the coupler piston and the valve seat facing away from the end face of the valve needle, through which a hydraulic coupling between the coupler piston and valve needle is possible in a simple manner.
  • a receiving bore is formed in the coupler piston, in which the bolt is arranged and protrudes through the slot formed as a slot of the valve needle.
  • Particularly advantageous construction of the invention operates when the actuator that moves the coupler piston is designed as a piezoelectric actuator, so that a fast movement of the coupler piston is possible.
  • FIG. 1 shows a longitudinal section through a fuel injection valve according to the invention
  • Figure 2 is an enlarged view of Figure 1 in the region of the coupler piston
  • Figure 3 is a comparison with Figure 2 rotated by 90 ° view of the valve needle in
  • Figure 4 in the same representation as Figure 3 shows a further embodiment of the valve needle with a modified recess.
  • the fuel injection valve has a valve body 1, an intermediate disc 3 and a holding body 5, which are pressed against each other by a mechanical tensioning device, not shown in the drawing.
  • a bore 9 is formed, which is delimited at the combustion chamber end by a substantially conical valve seat 11. From the valve seat 11 go from a plurality of injection openings 14, which open into the installation position of the fuel injection valve in the combustion chamber of the internal combustion engine.
  • a longitudinal axis 13 having a valve needle 7 is arranged, which is piston-shaped and has at its valve seat side end a valve sealing surface 8, with which it cooperates with the valve seat 11.
  • valve needle 7 is guided on the one hand in a lower guide portion 10 in the bore 9 and the other in a guide bore 25 which is formed in the washer 3. Between the valve needle 7 and the wall of the bore 9, a pressure chamber 16 is formed, the valve seat facing away from expanded into a spring chamber 116 which is bounded by the washer 3. The inflow of fuel from the pressure chamber 16 to the injection openings 14 is ensured here by bevels 12 at the lower guide portion 10.
  • an inlet passage 30 runs through the fuel from a formed in the holding body 5 high pressure chamber 27 in the
  • Pressure chamber 16 can be introduced.
  • the high-pressure chamber 27 is in this case connected to a high-pressure accumulator, not shown in the drawing, in which compressed fuel is made available under high pressure.
  • a closing spring 20 is arranged, which surrounds the valve needle 7 and which is supported at one end to the intermediate disc 3. At the other End is the closing spring 20 against a support ring 22, which in turn rests against the valve needle 7, so that by the closing spring 20 acting in the direction of the valve seat 11 longitudinal force is exerted, which presses the valve needle 7 against the valve seat 11.
  • a pressure shoulder 18 is formed, which is acted upon by the fuel pressure in the pressure chamber 16. The pressurization of this pressure shoulder 18 results in a hydraulic, directed away from the valve seat 11 opening force, which is opposite to the force of the closing spring 20.
  • an actuator in the form of a piezoelectric actuator 32 is arranged and a coupler piston 34 fixedly connected to the piezoactuator 32.
  • the coupler piston 34 has a central recess 36 in which the valve needle 7 protrudes with its end remote from the valve seat.
  • a control chamber 14 is limited, which is connected via an inlet throttle 44 to the high-pressure chamber 27.
  • a coupler volume 38 is formed between the coupler piston 34 and the washer 3, which surrounds the valve needle 7.
  • the coupler volume 38 is connected via the annular gap, which remains between the coupler piston 34 and the wall of the high-pressure chamber 27, with the high-pressure chamber 27, which is filled with fuel under high pressure.
  • Figure 2 shows an enlarged view in the region of the coupler piston 34.
  • a receiving bore 46 is formed, which penetrates the coupler piston 34 in the region of the central recess 36 from one side to the other.
  • a bolt 42 is arranged, which has a
  • Longitudinal axis 142 has and beyond the receiving bore 46 also protrudes through a recess 48 which is formed in the valve needle 7 and which here has the shape of a slot 148.
  • the bolt 42 is located on the valve seat facing away from the upper end of the slot 148, when the valve needle 7 is in its closed position and the coupler piston 34 through the
  • Piezoactuator 32 is in a valve seat near position gefehren.
  • the position of the bolt 42 in the slot 148 is shown again in detail in Figure 3, wherein the valve needle 7 with respect to FIG. 2 is shown rotated by 90 °.
  • the elongated hole 148 has its greatest width b in the direction of a first transverse axis 50, while it has a smaller width a perpendicular thereto, that is to say in the direction of a second transverse axis 52.
  • the smaller width a is in this case slightly larger than the outer diameter of the bolt 42, so that it is displaceable within the oblong hole 148 in the direction of the transverse axis 50.
  • the slot 148 shows in cross-section a shape which is composed of two mutually opposite semicircles 100, 101, which are connected by straight, mutually parallel stretches 102 with each other.
  • the diameter of the semicircles 100 and 101 which corresponds to the smaller width a, is only slightly larger than the diameter of the bolt 42, so that a possible flat contact of the bolt 42 is given at the end of the slot 42.
  • the fuel injector operates as follows: At the beginning of the injection cycle, the valve needle 7 is in its closed position, i. in contact with the valve seat 11. As a result, the valve needle 7 closes the Einspritzöffhungen 14 against the pressure chamber 16, is present in the fuel under injection pressure.
  • the piezoactuator 32 has reached an extent in which it presses the coupler piston 34 in the direction of the valve seat so far that the bolt 42 at the upper end of the slot 148, i. abuts the end which faces away from the valve seat 11.
  • the same pressure prevails as in the inlet channel 30 and in the pressure chamber 16, due to the inlet throttle 44 and the gap between the coupler piston 34 and the wall of the high-pressure chamber 27th
  • the piezoelectric actuator 32 is shortened. Since the piezoelectric actuator 32 is fixedly connected to the coupler piston 34, the coupler piston 34 moves away from the valve seat 11 and thereby takes through the pin 42, the valve needle 7, which lifts off from the valve seat 11 and the injection openings 14 releases. From the pressure chamber 16 now flows fuel between the valve sealing surface 8 and the valve seat 11 through to the Einspritzöffhungen 14 is injected through the latter into the combustion chamber of the internal combustion engine.
  • valve sealing surface 8 As soon as the valve needle 7 has lifted off the valve seat 11, additional parts of the valve sealing surface 8 are acted upon by the fuel pressure in the pressure chamber 16.
  • the hydraulic opening force on the valve needle 7 increases, which determines the further opening of the valve needle 7 together with the hydraulic force on the pressure shoulder 18.
  • the pressure in the control chamber 40 and also in the coupler volume 38 decreases. This reduces the closing force by the pressure in the control chamber 40 and thus accelerates the movement of the valve needle 7, so that the valve needle 7 continues its further opening stroke, even if the coupler piston 34 due to the relatively small stroke of the piezoelectric actuator 32 already after a short distance Minimum is contracted. It is not hindered because of the shape of the elongated hole 148 until it has reached its upper reversal point by the pressure conditions in the control chamber 40.
  • the piezoelectric actuator 32 is extended again, so that the coupler piston 34 is moved in the direction of the valve needle 7.
  • the valve needle 7 is pushed back in the direction of the valve seat 11 and thus again reaches its closed position, in which the injection openings 14 are closed.
  • the piezoelectric actuator 32 has a thermal drift during operation, so that its length changes over time and due to temperature fluctuations. To compensate for this, various measures are possible. One possibility is the
  • Piezoactuator 32 designed so that at its maximum extension of the bolt 42 has a distance h to the valve seat facing away from the end of the slot 148, as shown in Figure 3. This causes the bolt 42 only when the coupler piston 34 has passed through the path h. at the valve seat facing away, upper end of the slot 148 comes to rest. Since the piezoelectric actuator 32 switches very quickly, it is irrelevant for the opening time of the valve needle 7, whether the bolt 42 is applied directly to the valve needle 7 or whether first a small distance h must be passed through.
  • Piston 34 rests on the pin 42 on the valve needle 7.
  • piezoelectric actuator 32 does not act directly on the coupler piston 34, but on a further piston which is hydraulically connected to the coupler piston 34.
  • the hydraulic coupling can then compensate for changes in length of the piezoelectric actuator 32.
  • the recess 48 does not have to have the shape of a slot 148. It is also possible, for example, a triangular recess 248 with rounded corners, wherein the tip, on which the bolt 42 bears during the opening movement, is directed away from the valve seat 11. FIG. 4 shows such a triangular recess 248, wherein other shapes are also conceivable which allow a corresponding movement of the bolt 42 in the recess 48.

Landscapes

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

Abstract

L'invention concerne un injecteur de carburant pour moteurs à combustion interne, qui comporte une aiguille de soupape (7), placée de façon à pouvoir effectuer un mouvement longitudinal et coopérant avec un siège de soupape (11) pour commander au moins un orifice d'injection (14). Un piston à coupleur (34) est également placé de façon à pouvoir effectuer un mouvement longitudinal et peut être déplacé au moins indirectement par un actionneur (32). Ce piston à coupleur (34) est relié à une cheville (42) présentant un axe longitudinal (142) et faisant saillie dans un évidement (48) de l'aiguille de soupape (7), évidement (48) dans lequel un mouvement de la cheville (42) perpendiculaire à son axe longitudinal (142) est possible.
PCT/EP2006/060622 2005-04-06 2006-03-10 Injecteur de carburant pour moteurs a combustion interne Ceased WO2006106024A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005015737.8 2005-04-06
DE102005015737.8A DE102005015737B4 (de) 2005-04-06 2005-04-06 Kraftstoffeinspritzventil für Brennkraftmaschinen

Publications (1)

Publication Number Publication Date
WO2006106024A1 true WO2006106024A1 (fr) 2006-10-12

Family

ID=36374667

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/060622 Ceased WO2006106024A1 (fr) 2005-04-06 2006-03-10 Injecteur de carburant pour moteurs a combustion interne

Country Status (2)

Country Link
DE (1) DE102005015737B4 (fr)
WO (1) WO2006106024A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4546924A (en) * 1983-11-25 1985-10-15 Southwest Research Institute Fuel injector
WO1993000540A1 (fr) * 1991-06-21 1993-01-07 Lucas Industries Public Limited Company Electrovanne
EP1174615A2 (fr) 2000-07-18 2002-01-23 Delphi Technologies, Inc. Injecteur de combustible

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4546924A (en) * 1983-11-25 1985-10-15 Southwest Research Institute Fuel injector
WO1993000540A1 (fr) * 1991-06-21 1993-01-07 Lucas Industries Public Limited Company Electrovanne
EP1174615A2 (fr) 2000-07-18 2002-01-23 Delphi Technologies, Inc. Injecteur de combustible

Also Published As

Publication number Publication date
DE102005015737A1 (de) 2006-10-12
DE102005015737B4 (de) 2016-02-04

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