Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
  • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
  • F02M51/0603—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
  • 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
• • 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
  • F02M61/165—Filtering elements specially adapted in fuel inlets to injector

Definitions

• the invention relates to a fuel injector according to the preamble of claim 1.
• the high-pressure fuel connection has a bore in which a rod filter is arranged, which prevents impurities from entering the injector.
• the object of the invention is to provide a fuel injector according to the preamble of claim 1, which has an improved filtering effect.
• the object is with a fuel injector with an injector housing which comprises a high-pressure fuel connection and a high-pressure actuator receiving space in which an actuator is connected. is ordered, and with a filter element, achieved in that the filter element is arranged in the injector.
• a preferred embodiment of the fuel injector is characterized in that the filter element is arranged in the radial direction between the actuator and the injector housing and has the shape of a sleeve with a plurality of small through holes, which flows through during operation of the Kraftstoffinj ector of high-pressure fuel become.
• This has the advantage that the filter element provides a large effective filter surface, without it requires a lot of space. The flow through the filter element takes place in the radial direction from the inside to the outside or from the outside inwards.
• the diameter of the through holes is 20 to 40 microns.
• the through holes are preferably formed by bores which extend substantially in the radial direction.
• the holes are preferably drilled by means of a laser device.
• the high-pressure fuel port is in communication with an annular space which extends between the filter element and the injector housing. Through the high-pressure fuel port, the fuel passes into the annulus and from there through the filter element.
• Another preferred exemplary embodiment of the fuel injector is characterized in that a further annular space extends between the filter element and the actuator. Through the further annular space of the filtered fuel passes into the interior of the injector.
• the high-pressure fuel port is connected to an annular space which extends between the actuator and the filter element. Through the high-pressure fuel port, the fuel passes into the annulus and from there through the filter element.
• a further preferred embodiment of the fuel injector is characterized in that the filter element has at one end a feed hopper into which a high-pressure fuel channel opens, which starts from the high-pressure fuel port.
• the feed hopper is preferably integrally connected to the filter element.
• a further preferred embodiment of the fuel injector is characterized in that a further annular space extends between the filter element and the injector housing. Through the further annular space of the filtered fuel passes into the interior of the injector.
• a further preferred embodiment of the fuel injector is characterized in that a guide ring is attached to at least one end of the filter element.
• the guide ring may extend radially inwardly or radially outwardly from the filter element. When the guide ring extends radially outwardly, it preferably abuts against the injector housing. When the guide ring extends radially inward, it preferably bears against an actuator piston.
• the filter element is acted upon at one end in the axial direction with the biasing force of a spring device. The other end of the filter element is preferably against the injector housing.
• a further preferred embodiment of the fuel injector is characterized in that the annular space and / or the further annular space in the radial direction has an extension of 100 to 200 microns / has.
• FIG. 1 shows a detail of a fuel injector according to a first embodiment in longitudinal section
• FIG. 2 shows a section of a fuel injector according to a second exemplary embodiment in longitudinal section
• Figure 3 is an enlarged view of a section III of Figure 2 and
• FIG. 4 shows an enlarged view of a section IV from FIG. 2.
• FIG. 1 shows a section of a fuel injector 1 with an injector housing 2 in longitudinal section.
• the injector housing 2 comprises an injector body 3, which is also referred to as a holding body.
• An arrow 5 indicates a high-pressure fuel connection, through which high-pressure fuel passes into a high-pressure fuel passage 6, which is recessed in the holding body 3.
• the high-pressure fuel channel 6 opens into an orifice region 7 in a main bore 10, which extends in the interior of the holding body 3 in the longitudinal direction.
• the main bore 10 of the injector body or holding body 3 is closed by an intermediate plate 12.
• the intermediate plate 12 is clamped by means of a clamping nut 13 between a nozzle body 14 and the holding body 3.
• the nozzle body 14 protrudes with its lower end shown cut off into the combustion chamber of an internal combustion engine to be supplied with fuel.
• an axial guide bore is omitted, in which a nozzle needle 15 is guided in an axially displaceable manner.
• At the combustion chamber near the end of the nozzle needle 15 at least one injection hole is provided in a known manner, is injected by the high-pressure fuel from the nozzle body 14 into the combustion chamber of the internal combustion engine when the nozzle needle 15 lifts with its tip from an associated nozzle needle seat.
• a control chamber limiting sleeve 16 is guided under sealing action, which limits a control chamber 18.
• the control chamber 18 is connected via a through hole 19 with an actuator pressure chamber 20 in connection.
• the actuator pressure chamber 20 is delimited by an actuator pressure chamber limiting sleeve 22, which is guided at the end of an actuator piston 24 of a piezoelectric actuator 25 close to the combustion chamber.
• the actuator pressure chamber 20 and the piezoelectric actuator 25 are subjected to high pressure. To protect the piezoelectric actuator 25, this is provided radially on the outside with an insulation 27.
• a filter element 30 is arranged, which is substantially in the form of a sleeve and therefore also referred to as a filter sleeve 30.
• the filter sleeve 30 is provided with a plurality of through holes 31, 32, the size of which is such that impurities, such as chips, do not pass through the filter element 30.
• the filter element 30 At its end remote from the combustion chamber, the filter element 30 has a collar 34 which bears against the holding body 3. At its end close to the combustion chamber, the filter element 30 has a further collar 35, which also bears against the holding body 3. In the axial direction between the collars 34, 35, which are also referred to as guide rings, and in the radial direction outside the filter element 30, an annular space 37 is formed, which is connected to the mouth region 7 of the high-pressure fuel channel 6. The annular space 37 is filled via the high-pressure fuel passage 6 with fuel, which is subjected to high pressure.
• the high pressure fuel passes through the through holes 31, 32 of the filter element 30 in a further annular space 38 which is provided in the radial direction between the piezoelectric actuator 25 and the filter element 30.
• the filtered fuel then passes from the further annular space 38 into the interior of the holding body 3, ie towards the combustion chamber.
• a coupling ring 39 At the combustion chamber near the end of the filter element 30 and the collar 35 is a coupling ring 39 at. Between the coupling ring 39, which may be formed in one piece with the filter element 30 or the collar 35, and the actuator pressure chamber limiting sleeve 22 is a screw compression spring 40 clamped. By the biasing force of the helical compression spring 40, the filter element 30 is stably held in the illustrated position.
• the limited by the main bore 10 and acted upon by high pressure Aktorfactraum is connected via two through holes 41 and 42 which are recessed in the intermediate plate 12, with the interior of the nozzle body 14 in connection.
• the filter sleeve 30 rests with the collars or guide rings 34, 35 on the holding body 3. By the biasing force of the spring 40, the filter sleeve 30 is pressed in the axial direction of the holding body 3.
• FIGS. 2 to 4 a fuel injector 51 is shown in different views, which is similar to the fuel injector 1 shown in FIG. To denote the same or similar parts, the same reference numerals are used. To avoid repetition, reference is made to the preceding description of FIG. In the following, the differences between the two embodiments are mainly discussed.
• a filter sleeve 60 is arranged in the radial direction between the piezoactuator 25 and the holding body 3.
• the filter sleeve 60 comprises, as shown enlarged in Figure 4, a plurality of through holes 61, 62.
• the filter sleeve 60 At its end remote from the combustion chamber, the filter sleeve 60 has a guide ring 64 which rests against the holding body 3.
• the filter sleeve 60 has a guide ring 65 which abuts the actuator piston 24 is applied.
• annular space 67 is provided, which communicates via the through holes 61, 62 in the filter sleeve 60 with another annular space 68 in connection, which is provided in the radial direction between the filter sleeve 60 and the holding body 3.
• a coupling ring 69 is clamped.
• the filter element 60 in the region of the mouth region 7 of the high-pressure fuel channel 6 is equipped with a feed funnel 72 which, as seen in FIG. 3, has a through-hole 73.
• the feed funnel 72 surrounds the mouth region 7 of the high-pressure fuel channel 6 so that the fuel from the high-pressure fuel passage 6 passes through the through hole 37 into the annular space 67. From the annular space 67, the fuel passes through the through holes 61, 62 in the filter element 60 in the further annular space 68, as indicated in Figure 4 by an arrow 78. From the further annular space 68 of the high-pressure fuel then passes into the interior of the nozzle body.
• the filter sleeve 60 shown in Figure 2 is flowed through radially from the inside to the outside. This provides the advantage that the third dimension is taken into account. Thus, chips that have a relatively small diameter, but are relatively long, are stopped by the filter element 60.
• the filter elements illustrated in FIGS. 1 to 4 generally provide the advantage that they have a good filtering effect, without taking advantage of pressure wave effects. The large area with the multiplicity of holes prevents wear of the filter element in its lifetime.

Landscapes

• 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)

Applications Claiming Priority (2)

Publications (2)

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ID=37983273

Family Applications (1)

Country Status (4)

Cited By (2)

Families Citing this family (1)

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• 2006
  • 2006-03-28 DE DE102006014243A patent/DE102006014243A1/de not_active Withdrawn
• 2007
  • 2007-02-12 DE DE502007005756T patent/DE502007005756D1/de active Active
  • 2007-02-12 WO PCT/EP2007/051327 patent/WO2007110268A1/fr active Application Filing
  • 2007-02-12 AT AT07726349T patent/ATE489555T1/de active
  • 2007-02-12 EP EP07726349A patent/EP2002114B1/fr not_active Not-in-force

Non-Patent Citations (1)

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