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
  • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
  • F02M63/0012—Valves
  • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
• • 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
  • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
  • F02M63/0012—Valves
  • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
  • F02M63/0045—Three-way valves

Definitions

• the invention relates to an Inj ector for a
• control valve for opening and closing a nozzle needle
• control valve has a valve body with a valve cone which cooperates with a valve seat of a housing of the control valve.
• Valve body pressed by a closing spring against a punch of an actuator and centered over the valve seat.
• control valve for opening and closing a nozzle needle
• the control valve comprises a housing and an actuator, wherein in the housing a stepped bore is formed with a spring chamber for receiving a valve body, wherein a portion of the stepped bore as an inlet and a portion of the stepped bore as Outlet are formed, and with a first valve seat, wherein the valve body has a valve cone cooperating with the first valve seat, and wherein the valve body arranged by a in the spring chamber Closing spring is pressed against the punch of an actuator, it is provided that the valve body is guided at least in a portion of the stepped bore, and wherein in this section one or more passages for the control amount of Inj ector are present.
• valve body is guided at least in a portion of the stepped bore, it is ensured that the valve cone of the valve body always impinges almost centric and slip arm on the valve seat of the housing. This avoids, first, local overstressing of the valve plug and valve seat, and reduces wear of the valve seat and poppet. Both effects cause the valve lift changes only slightly during operation of the internal combustion engine, so that the operating behavior of the internal combustion engine remains approximately the same over the entire life.
• the game between stepped bore and the guide portion of the valve body is so large that the valve body in the closed position of the control valve centered on the valve seat of the housing, as only then closes the control valve tight.
• an inlet of the control valve is in communication with a control chamber of the injector, while an outlet of the control valve communicates with a fuel return.
• the closing spring on the Valve body acts counter to the actuation direction of the actuator. This ensures that the valve body always occupies a defined position and the control valve is closed when the actuator is de-energized.
• the closing spring is at least indirectly supported against the housing and a spring plate of the valve member.
• the guidance of the valve body can preferably take place in the region of the outlet and / or in the region of the spring chamber. It is alternatively possible that the valve body is guided on the spring plate or that a sleeve is provided in the spring chamber and that the valve body is guided by the sleeve.
• the passages are alternatively designed as grooves, flattenings and / or longitudinal bores extending in the longitudinal direction of the valve body.
• the housing can be made in two parts.
• the control valve can be integrated both as a separate component and in the injector.
• the housing of the control valve is at the same time the housing of the Inj ector.
• the control valve can be designed as a 2/3-way control valve.
• the valve body can be actuated by a piezoactuator.
• a piezoactuator As a result, extremely fast control movements are possible.
• the seat in the housing and the valve plug on the valve body does not wear appreciably, despite the short travel of a piezoelectric actuator, the function of the control valve over the entire life of the internal combustion engine guaranteed.
• the injector according to the invention is preferably used in common rail fuel injection systems.
• Figure 1 is a schematic representation of an Inj ector and Figures 2 to 5 embodiments of inventive control valves.
• FIG. 1 shows an injector with a control valve 15 according to the invention.
• Fuel is passed through a feed channel 5 to an injection nozzle 7 and through an inlet throttle 9 into a control chamber 11 via a high-pressure port 1.
• the control chamber 11 is connected via a drain channel 12 and an outlet throttle 13 with a fuel return 17.
• a bypass 14 establishes a hydraulic connection between the inlet channel 5 and an input of the control valve 15.
• the control chamber 11 is bounded by a control piston 19.
• a nozzle needle 21 connects, which prevents the pressurized fuel flows between the injections in the combustion chamber, not shown.
• Control piston 19 and nozzle needle 21 may also be made in one piece.
• the nozzle needle 21 has a change in cross section from a larger diameter 25 to a smaller diameter 27. With its larger diameter 25, the nozzle needle 21 is guided in a sleeve 28.
• FIG. 2 shows a first embodiment of a inventive control valve 15 shown enlarged.
• the two-part housing which consists of the parts 29a and 29b, has a stepped bore 41.
• a first portion 41 a of the stepped bore forms the bypass 14 of the control valve 15.
• This bypass 14 is hydraulically connected to the inlet channel 5 of the Inj ector (not shown).
• a second portion 41b forms a spring space, while a third portion 41c of the stepped bore 41 forms the outlet of the control valve 15. This outlet is hydraulically connected to the fuel return 17 (see FIG. 1).
• Outflow channel 12 begins in the control room 11 of the Inj ector.
• a first valve seat 43 is formed between the sections 41b and 41c of the stepped bore 41.
• a valve cone 47 is formed, which cooperates with the first valve seat 43.
• a stub 49 is formed on the valve body 45, which abuts with its end face against a plunger 51 of a piezoelectric actuator (not shown).
• a piezoelectric actuator not shown below the valve cone 47.
• the piezoelectric actuator (not shown) is not energized, so that the valve cone 47 of the valve body 55 rests against the first valve seat.
• the control valve 15 closed.
• the valve body 45 is thus clamped between the punch 51 and the closing spring 55.
• the illustrated in Figure 2 embodiment of a control valve 15 according to the invention is designed as a double-switching control valve.
• formed as a flat seat second valve seat 57 is formed at the transition between the first portion 41 a and 41 b of the stepped bore 41.
• This second valve seat 57 cooperates with an end face 59 of the valve body 45.
• Valve seat 57 the outlet throttle 13 is opened.
• valve body 45 When the valve body 45 is held in this second switch position (not shown), the hydraulic connection is between the drain throttle 13 and the fuel return 17 is opened. As long as this hydraulic connection is made, the nozzle needle 21 of the Inj ector lifts from its nozzle needle seat, so that fuel is injected into the combustion chamber of the internal combustion engine.
• the spring plate 53 is tuned in diameter to the diameter of the second portion 41b of the stepped bore 41 that a very small gap "s" between the spring plate 53 and the second portion 41b of the stepped bore
• This gap s is dimensioned such that the valve body 45 is guided laterally, so that the valve cone 47 always impinges on exactly the same point of the valve seat 43 when the control valve 15 is closed, thereby preventing the slip and thus the wear on the valve cone 47 and first valve seat 43 significantly reduced.
• the gap "s" must be dimensioned so large that the valve cone 47 centers itself in the first valve seat 43.
• the guidance of the valve body 45 on the outer diameter of the spring plate 53 is merely intended to prevent the valve body 45 from being deflected appreciably laterally should happen during operation of the internal combustion engine the poppet 47 eccentrically impinge on the valve seat 43, which may result in local overstress.
• the closing spring 45 By the force of the closing spring 45, the valve body 45 would then be centered in the first valve seat 43. The resulting
• FIGS. 2b and 2c show further embodiments of passages according to the invention.
• four radially arranged grooves 63 are provided in the spring plate 53, while in the exemplary embodiment according to FIG. 2c four holes 65 are present in the spring plate 53.
• valve body 45 is guided in the third section 41 c of the stepped bore 41.
• Diameter of the stub 49 is chosen so that again sets a gap "s" between the stub 49 and the third portion 41c of the stepped bore 41. Again, it has proved to be advantageous if the gap s is less than 0.05 mm.
• FIGS. 3a and 3b show sectional views along the line B-B of two different types of stub 49 according to the invention.
• Flats 61 are provided in the exemplary embodiment according to FIG. 3a, while grooves 63 are provided in the exemplary embodiment according to FIG. 3b and extend over the entire length of the guide section between the stub 49 and the third section 41c of the stepped bore 41.
• the invention is not limited to the explicitly illustrated forms of the flats 61, the grooves 63 and the holes 65.
• FIG. 4 shows a further exemplary embodiment of a control valve 15 according to the invention.
• the valve body 45 is guided in the region of the portion 41 b of the stepped bore through a sleeve 67.
• the sleeve 67 is designed as a ring with approximately square cross section, while on the left side of the sleeve 67 has an L-shaped cross-section.
• the essential difference between these two embodiments is the overlap Hi and H 2 between the valve body 45 and the sleeve 67th
• 45 longitudinal grooves 63 are provided in the sleeve 67 and / or the valve body.
• two different shapes of cross sections of the grooves 63 are shown. Which of these forms is given preference depends on the space available and the amount of tax to be deducted.
• FIG. 5 shows a further exemplary embodiment of a control valve 15 according to the invention.
• the sleeve 67 is disposed between the spring plate 53 and the closing spring 55.
• two different forms of sleeves 67 are shown on the right and on the left side. Both embodiments have in common that the passages are designed in the form of grooves 63.
• grooves 63 are additionally provided in the valve body.
• the spring plate 53 bores 65 which also serve to discharge the control and leakage amount from the Inj ector (not shown) through the control valve 15 into the fuel return 17.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Fuel-Injection Apparatus (AREA)
• Lift Valve (AREA)
• Paper (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=35695551

Family Applications (1)

Country Status (6)

Families Citing this family (30)

Family Cites Families (18)

• 2004
  • 2004-12-22 DE DE102004061800A patent/DE102004061800A1/de not_active Withdrawn
• 2005
  • 2005-11-22 DE DE502005006773T patent/DE502005006773D1/de not_active Expired - Lifetime
  • 2005-11-22 AT AT05808118T patent/ATE424506T1/de not_active IP Right Cessation
  • 2005-11-22 WO PCT/EP2005/056138 patent/WO2006067015A1/fr not_active Ceased
  • 2005-11-22 EP EP05808118A patent/EP1831537B1/fr not_active Expired - Lifetime
  • 2005-11-22 US US11/719,424 patent/US7621258B2/en not_active Expired - Fee Related
  • 2005-11-22 CN CN2005800399453A patent/CN101061308B/zh not_active Expired - Fee Related

Non-Patent Citations (1)

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