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
  • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
  • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
  • F02M55/025—Common rails
• • 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 injection device according to the preamble of claim 1.
• the DE 20 2004 019 820.7 relates to a fuel injection device for a diesel engine.
• the fuel injection device has a plurality of branch pipes, which serve to discharge fuel from a high-pressure fuel accumulator of the fuel injection device.
• a throttle is mounted, which is embodied by a support member which in turn is fixed in the region of the connection head by fixing, which are formed with the upsetting of a connection head on the branch pipe and narrow a width of the branch pipe on both sides of the support element ,
• the throttle element is embodied in the carrier element as a through-bore with a first partial bore and a second partial bore, wherein the carrier element has a substantially cylindrical lateral surface.
• DE 100 60 785 A1 relates to a fuel injection device with a high-pressure fuel accumulator.
• branch pipes are screwed, each containing a throttle for reducing pressure pulsations in the fuel injection device.
• the throttles are each formed as a pipe piece disposed at one end of the branch pipe to which a connection head is attached or inside the branch pipe near that end.
• Throttle elements in high-pressure accumulators are used for pressure wave attenuation within the high-pressure accumulator body.
• cylindrical throttle pieces in connection bores of the high-pressure accumulator which lead to the individual fuel injectors or to the high-pressure accumulator acting on the high-pressure pump, pressed.
• the throttle elements pressed into the connection bores serve to improve the damping of pressure oscillations within the fuel injection system and thereby enable an increase in the pressure resistance of the individual components.
• Object of the present invention is to provide a fuel injection system, in particular a Hochdruck umaneinspritzsy system, in which the integrated into the individual high-pressure supply lines to the fuel injectors bar filter can be omitted.
• the filter element embodied as a screen filter with the press-fit throttle element and thereby to replace the bar filter, which is currently located directly in front of the fuel injector in the high-pressure feed line according to the solutions known from the prior art.
• the inventively proposed Einpressdrosselelement with integrated filter can be designed both as a single-stage throttle and as a two-stage throttle.
• a through hole with a constant bore diameter or a stepped bore with a first throttle section and a second throttle section can be introduced into a throttle element carrier.
• connection of the components can, for example by means of a cohesive joining method, such as soldering, can be achieved.
• the carrier element in which the single-stage press-fit throttle is formed either as a through-bore or as a stepped through-bore forming two throttle sections, has a sieve filter integrated therewith Filter element is pressed into the respective connection holes of the high-pressure feed lines of the fuel injectors.
• This makes it possible to ensure that the filter element projecting into the cavity of the high pressure reservoir (common rail) optimally fulfills its filter function and, because of the depth of immersion of the filter element in the cavity of the high pressure reservoir (common rail), ensures that all of the peripheral surfaces of a
• cylindrically shaped filter element executed fine Filteröffhungen be acted upon by the fuel under extreme pressure.
• the entire peripheral surface of the filter element for filtering the fuel is available.
• the carrier body of the one- or two-stage formable press-fit throttle is preferably pressed into the wall of the high pressure storage space, whereby a frictional connection between the support body, which is also preferably cylindrical, and the bore wall of the connection bore in the wall of the high pressure storage space (common rail) is achieved.
• the connecting pieces on which the individual high-pressure feed lines leading to the fuel injectors are connected can be placed on the outer lateral surface of the high-pressure storage chamber (common rail).
• a centering surface for the connecting pieces in the region of the connecting bores, in which the Einpressdrossel is embedded with integrated filter element, are formed.
• the fittings which are also referred to as high-pressure fittings, can be welded to the outer lateral surface of the high-pressure reservoir (common rail). This makes it possible to achieve a high-pressure-tight connection of the connection bore with the high-pressure line to the individual fuel injectors.
• FIG. 1 shows a cross section through a high-pressure storage space according to the prior art
• Figure 2 shows a section according to the section line II-II in Figure 1 and 3 shows a high-pressure storage space in which the inventively proposed Einpressdrosselelement is incorporated with an integrated filter element.
• Figure 1 is a cross section of a known from the prior art high-pressure accumulator space (common rail) with connector to remove.
• a fuel injection device comprises a high-pressure storage chamber 10, which is tubular.
• a high-pressure storage chamber 10 which is tubular.
• the one cavity 12 of the high-pressure accumulator chamber 10 (common rail) acting on the high pressure pump and the individual from the high-pressure accumulator 10 (common rail) pressurize fuel injectors are not shown.
• High-pressure lines 18 connect the fuel injectors and the high-pressure pump to the high-pressure reservoir 10.
• the high-pressure storage space 10 comprises a wall 14 which delimits a hollow space 12 running perpendicular to the plane of the drawing according to FIG.
• the outer circumferential surface of the wall 14 is identified by reference numeral 16.
• In the wall 14 of the high pressure storage chamber 10 are individual connection bores 24, in which a throttle element 28 is integrated.
• the throttle element 28 protrudes with its a boundary surface 30 of the cavity 12 facing side into the cavity 12 of the high-pressure accumulator chamber 10 into it.
• connection piece 18 On the outer circumferential surface 16 are in the region of the individual connection bores 24 connecting pieces 18 added.
• the connecting piece 18 shown in FIG. 1 comprises an external thread 20, to which the high-pressure line 21, which is connected to the fuel injector, which is not shown, under high pressure, is fastened in a pressure-tight manner.
• the flow cross section within the connector 18 is indicated by reference numeral 22.
• the connecting bore 24 introduced into the wall 14 of the high-pressure storage chamber 10 passes above the throttle element 28 into a connection cone 26, to which the high-pressure line 21 is connected to the fuel injector or to the high-pressure pump.
• the flow direction of the fuel to the fuel injector, not shown in Figure 1 is indicated by reference numeral 32.
• the high-pressure line 21 has, at its end facing the high-pressure reservoir 10, a collar 23 which is pressed into the connection cone 26 in a pressure-tight manner after tightening a union nut 19, thereby producing a pressure-tight connection of the high-pressure line 21 to the high-pressure reservoir 10.
• the illustration according to FIG. 2 shows a section according to the section line II-II in FIG.
• the contact surface 34 lies in a depression 36 in the wall 14 of the high-pressure reservoir 10.
• the connection piece 18, which is also referred to as a high-pressure fitting, is fastened to the contact surface 34, for example by means of a materially bonded connection, for example by soldering or by welding. connected to the outer circumferential surface 16, or the bottom of the recess 36 in the wall 14 of the high-pressure storage space 10.
• FIG. 3 shows the press-in throttle element with integrated filter element proposed according to the invention.
• An injection throttle element 40 shown in FIG. 3 comprises a throttle element carrier 50, which is preferably cylindrical.
• a filter element 44 is integrated, which is preferably designed as a sieve filter.
• the filter element 44 comprises a lateral surface 48, which contains a multiplicity of smallest screen holes 46.
• the filter element 44 integrated into the throttle element carrier 50 protrudes into the cavity 12 of the high-pressure storage chamber 10 in an immersion depth 54. Due to the high pressure level generated in the cavity 12 of the high-pressure storage chamber 10 by the high-pressure pump, any impurities that may be contained in the fuel are forced through the very small diameter screen holes 46 on the lateral surface 48 of the filter element 44 and crushed in this way.
• the throttle element carrier 50 shown in FIG. 3 can have both a single-stage throttle and the stepped throttle shown in FIG.
• the stepped throttle within the throttle element carrier 50 is characterized by a first throttle portion 58, which connects directly to the filter element 44 and a second throttle portion 60.
• the first throttle section 58 has a smaller diameter than the second throttle section 60 in the throttle element carrier 50.
• the immersion depth 54 of the filter element 44 into the cavity 12 of the high-pressure storage chamber 10 is selected so that all sieve holes 46 on the lateral surface 48 of the filter element 44 are acted upon by the contained in the cavity 12 of the high pressure accumulator 10, under very high pressure fuel.
• the front side of the filter element 44 which projects into the cavity 12 of the high-pressure reservoir 10 (common rail), is identified by reference numeral 56.
• the arrangement of the filter element 44 which is integrated in the throttle element carrier 50 as shown in Figure 3 causes due to the prevailing in the cavity 12 of the high-pressure accumulator 10, very high pressure levels particles through the Sieblö- rather 46 in the lateral surface 48 of the filter element 44 are pressed, pass through the one or two-stage Einpressdrosselelement 40 and thus clogging of the projecting into the cavity 12 filter element 44 is effectively prevented.
• the Einpressdrosselelement 40 whether one or two stages formed, is received in the throttle element carrier 50, which is preferably cylindrical.
• connection bore 24 merges in the direction of a shoulder surface 52 on the outer circumferential surface 16 of the high-pressure reservoir 10 into the connecting cone 26.
• the trained on the outer circumferential surface 16 of the high-pressure accumulator chamber 10 approach surface 52 serves as a centering or mounting surface for the connector 18, also referred to as high-pressure fitting.
• the connecting piece 18 and the high-pressure reservoir 10 can be secured by way of a high-pressure-resistant, preferably cohesively formed connection.
• connection bore 24 Due to the non-positively introduced into the connection bore 24 throttle element support 50, the connection bore 24 is sealed against crawling of fuel between the lateral surface of the throttle element support 50 and the bore surface of the connection bore 24, so that einschmanende in the high-pressure line 21 fuel for passage of in the Einpressdrossel 40 integrated filter element 44 is forced. As a result, in turn, the entire amount of fuel entering the high-pressure line 21 is filtered.
• the integration of a rod filter in the high-pressure line leading to the fuel injector and the arrangement of this rod filter immediately before the fuel injector is dispensable.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Fuel-Injection Apparatus (AREA)
• Electric Double-Layer Capacitors Or The Like (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=36589013

Family Applications (1)

Country Status (5)

Cited By (2)

Families Citing this family (5)

Citations (7)

Family Cites Families (4)

• 2005
  • 2005-06-10 DE DE102005026992A patent/DE102005026992A1/de not_active Withdrawn
• 2006
  • 2006-05-03 JP JP2008515167A patent/JP2008542625A/ja active Pending
  • 2006-05-03 DE DE502006008445T patent/DE502006008445D1/de active Active
  • 2006-05-03 EP EP06754990A patent/EP1896720B1/de not_active Not-in-force
  • 2006-05-03 WO PCT/EP2006/062029 patent/WO2006131426A1/de active Application Filing
  • 2006-05-03 AT AT06754990T patent/ATE490402T1/de active

Patent Citations (7)

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