WO2010102850A1 - Soupape d'aspiration pour une pompe haute pression de carburant - Google Patents

Soupape d'aspiration pour une pompe haute pression de carburant Download PDF

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Publication number
WO2010102850A1
WO2010102850A1 PCT/EP2010/050565 EP2010050565W WO2010102850A1 WO 2010102850 A1 WO2010102850 A1 WO 2010102850A1 EP 2010050565 W EP2010050565 W EP 2010050565W WO 2010102850 A1 WO2010102850 A1 WO 2010102850A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter element
suction valve
intermediate piece
valve according
filter
Prior art date
Application number
PCT/EP2010/050565
Other languages
German (de)
English (en)
Inventor
Josef Guentert
Volkhard Ammon
Jochen Aleker
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
Priority to EP10700432A priority Critical patent/EP2406488A1/fr
Publication of WO2010102850A1 publication Critical patent/WO2010102850A1/fr

Links

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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • F02M37/44—Filters structurally associated with pumps
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • F02M37/48—Filters structurally associated with fuel valves
    • 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
    • F02M59/464—Inlet valves of the check valve type
    • 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
    • F02M2200/27—Fuel-injection apparatus with filters

Definitions

  • High-pressure fuel pumps in various designs whether as a radial piston pump or as a series injection pump, have been successful on the market for many years.
  • valve strokes of the suction valve depend on the flow rate and the speed of the internal combustion engine, the strokes of the suction valve are very small at low speeds and low load and when starting the engine.
  • the invention has for its object to provide a suction valve with a filter element for a high-pressure fuel pump, wherein the deposition rate of solid particles from the fuel before entering the suction valve of the high-pressure fuel pump further improved and overcome the disadvantages of the known from the prior art solutions at least partially become.
  • suction valve in particular for a Kraftstoffh och d jerk pump or a suction side controlled hydraulic pump
  • the suction valve is a valve plate having an outer contour, preferably a prismatic or cylindrical outer contour, wherein the valve plate has a central bore, and wherein at least one outer contour and the central bore connecting connecting bore is provided with a extending in the axial direction and surrounding the valve plate filter element, achieved in that the active filter surface of the filter element extends over the entire circumference of 360 ° of the filter element.
  • a particularly advantageous embodiment of the invention provides that the filter element comprises a perforated plate and / or a single-layer or multi-layer screen fabric, so that a suitable filter element can be used in accordance with the requirements of the maximum size of particles to be shut off.
  • Perforated sheets in addition to the very high precision with which the holes are can be made, the advantage that they are mechanically very resilient and even with large pressure differences on both sides of the perforated plate do not dodge.
  • the filter element When the filter element is attached to a cylindrical outer contour of the valve plate, it is usually advantageous to form the filter element cylindrical.
  • the filter element when the filter element is clamped between a shoulder of the housing in the pump and a screw plug, it is advantageous if the filter element is a simple or double frusto-conical and / or toroidal, for example, with a c-shaped profile in longitudinal section formed. Then namely length tolerances can be compensated by the elasticity of the filter element according to the invention in the axial direction readily. Also, a bypass flow of the fuel past the active filter surface is thereby effectively prevented.
  • a reinforcing ring in particular made of plastic or metal. If this reinforcing ring is made of plastic, the reinforcing ring can be sprayed onto the actual filter element. This plastic ring can also take over a sealing function in addition to the gain function. If the reinforcing ring is made of metal, it is often advisable to attach this reinforcing ring at the ends of the filter element by crimping.
  • a further, particularly advantageous embodiment of the invention provides to provide a toroidal intermediate piece between the outer contour of the valve plate and the filter element, wherein the intermediate piece is anchored in the connecting holes of the valve plate and the filter element is positively connected at its ends and / or materially connected to the intermediate piece ,
  • the intermediate piece consists of metal, preferably a thin-walled metal sheet, it is possible to push this intermediate piece onto the valve plate as a closed torus and to provide openings in the area of the connecting bores. If these openings are positioned concentrically to the connecting holes of the suction valve plate, passages are formed in a further production step at the openings, so that a positive connection between the intermediate piece and the valve plate, in particular the connecting holes, is formed.
  • the intermediate piece it is also possible to slit the intermediate piece and to install the apertures and the passages before mounting the intermediate piece on the suction valve.
  • a closed annular filter element for example, by crimping on the intermediate piece sealingly and positively secured.
  • the slot in the spacer is permanently closed.
  • the intermediate piece it is also possible to produce the intermediate piece from plastic, preferably a thermoplastic. In this case, it is advisable to spray the intermediate piece on the valve plate, so that even this results in a positive and cohesive connection between the intermediate piece and the valve plate.
  • the actual filter element is attached to the intermediate piece, for example by crimping or a forming process, such as welding or crimping with a heated tool, sealing.
  • these multilayer filter fabrics can be optimally adapted to the operating conditions in a fuel injection system of an internal combustion engine. They are also not subject to aging and are not attacked by the fuel.
  • these filter elements or filter fabric can be well formed and, if necessary in the desired shape by sintering or other joining processes permanently in this form. Welding is also possible. This may be required, for example, at the butt joint if an annular filter element is to be formed from a band-shaped filter fabric.
  • the aforementioned object is also achieved in a high-pressure fuel pump according to the independent claim 1 1, when the suction valve, which has a filter element according to one of the preceding claims, is used. It has surprisingly been found in the investigation of the suction valves and filter elements according to the invention that the filter elements according to the invention also effectively dampen the pressure fluctuations in the low pressure region of the fuel injection system. As a result, the characteristics of equipped with suction valves according to the invention high-pressure fuel pumps are much more stable, which is reflected in an improved quality of the pressure control on the delivery side of the high-pressure fuel pump and a reduced power requirement for the high-pressure fuel pump.
  • filter elements which have a certain elasticity in the axial direction, such as, for example, frusto-conical or tubular filter elements, are particularly suitable for this purpose.
  • Figure 1 shows a section through an embodiment of a high-pressure fuel pump according to the invention
  • Figure 2 is a suction valve in longitudinal section
  • Figure 3 is a section along the line A-A of Figure 2 and
  • FIG. 1 shows schematically a radial piston pump for high-pressure fuel supply in fuel injection systems, in particular common-rail fuel injection systems of internal combustion engines in section.
  • the radial piston pump shown in Figure 1 is equipped with an integrated demand quantity control.
  • the flow rate control is low pressure side via a metering unit ZME, not shown.
  • the radial piston pump shown in Figure 1 comprises a mounted in a pump housing 1 drive shaft 2 with two offset by 180 ° seconded cam 36. against the cam 36, a piston 8 is supported.
  • the invention is not limited to high-pressure fuel pumps with a pump element, as will be apparent from the further description of the invention readily.
  • the piston 8 is received in an element bore 1 1 in the radial direction movable back and forth and limited at its end remote from the drive shaft 2 a delivery chamber 12th
  • a plate 14 is provided on the piston 8. This plate 14 may either be integral with the piston 8 or detachably secured thereto.
  • a spring 17 is biased. The spring 17 presses the piston 8 against the bottom 20.
  • From the bottom 20 of the plunger 23 extends a cylindrical guide body 26 in the direction of the delivery chamber 12.
  • the guide body 26 is part of the plunger 23 and prevent tilting of the plunger 23 in a guide bore 29th
  • the plungers 23 are displaceable in a cylinder head 1.2.
  • a roller shoe 21 is provided with a half-round recess 27 which serves to support a roller 28.
  • the recess 27 and the roller 28 form a sliding bearing, while the roller 28 rolls on the cam 36 of the drive shaft 2.
  • the roller 28 is fixed in the guide body 26.
  • radial piston pump serves to pressurize fuel, which is supplied from a Vor fundamentalpumpe from a tank with high pressure.
  • the pistons 8 are moved away from the axis of rotation of the drive shaft camshaft 2 as a result of the eccentric movement of the cams 36 of the drive shaft 2.
  • the pistons 8 move radially toward the axis of the camshaft 2 in order to suck fuel into the delivery chamber 12.
  • a suction valve 51 is arranged in a filling bore 53 on the low pressure or suction side of the delivery chamber and in a high pressure line 55, a pressure-side check valve (not shown) is provided.
  • the pump housing 1 is constructed in several parts. It comprises a crankcase 1.1 and a cylinder head 1.2. In the cylinder head 1.2, the element bores 11, the delivery chamber 12 and a suction valve 51 and a high-pressure side check valve (not shown) are arranged. In connection with the claimed invention, it is of importance that a filling bore 53 opens into a likewise formed in the cylinder head 1.2 annular space 59.
  • the annular space 59 is formed as a groove-shaped depression in a stepped bore in a stepped extension of the element bore 11. At the top, this stepped bore is sealed by a closure screw 61, which has a recess for the upper part of the suction valve 51.
  • the suction valve 51 is shown greatly enlarged.
  • the suction valve 51 comprises a preferably circular valve plate 63 with a central bore 65. At the lower end of the central bore 65 in FIG. 2, a valve seat 67 is formed.
  • a valve member comprising a valve stem 69 and a valve plate 71 is slidably guided in the axial direction.
  • the valve stem 69 of the valve member protrudes beyond the valve plate 63 on the side opposite the valve seat 67.
  • a valve spring 73 is clamped between the valve plate 63 and the valve stem.
  • a sleeve 75 is pressed and / or welded to the shaft 69.
  • valve spring 73 ensures that the valve disk 71 is pressed against the valve seat 67 and the suction valve 51 is thus closed. Only when the pressure difference between the located above the valve disk part of the central bore 65 and the pressure prevailing below the valve plate 71 compressive forces overcome the bias of the valve spring 73, then opens the valve member and the valve plate 71 lifts from the valve seat 67.
  • the connecting bores 79 establish a hydraulic connection between the annular space 59 (see FIG. 2, top) and the part of the central bore 65 located above the valve disk 71.
  • FIG. 3 shows a section along the line A-A from FIG. 2. It becomes clear from FIG. 3 that the suction valve 51 is surrounded by an annular space 59, which is supplied with fuel via the filling bore 53. This fuel is conveyed by a prefeed pump (not shown).
  • the valve plate 63 is provided in the illustrated embodiment with a cylindrical outer contour 77 and has four connecting holes 79 which connect the outer contour 77 with the central bore 65. In the center of the suction valve 51, the valve stem 69 of the valve member is shown in section.
  • FIG. 4 shows a section from FIG. 1, with a first exemplary embodiment of a filter element 81 according to the invention being shown in this enlarged illustration.
  • This first embodiment of a filter element 81 according to the invention is designed as a frusto-conical perforated plate and / or filter mesh fabric.
  • At a first axial end 83.1 it is supported on the cylinder head 1.2 or a corresponding shoulder, while it is pressed down at its other axial end 83.2 by the locking screw 61 and pressed against the cylinder head 1.2.
  • the filter element 81 is clamped in the axial direction between the cylinder head 1.2 and the locking screw 61 and sealed at the same time.
  • a bypass of the fuel flowing from the filling bore 53 into the delivery chamber 12 is also effectively prevented from passing past the active surface of the filter element 81.
  • This filter element 81 can be used after insertion of the suction valve in the cylinder head 1.2 and is then fixed with the tightening of the screw plug 61 in the cylinder head 1.2.
  • FIG 5 the embodiment of a filter element 81 shown in Figure 4 is shown in a side view and partially in section. From Figure 5, the frusto-conical shape with the axial ends 83.1 and 83.2 can be clearly seen. In the right part, where the filter element is partially cut free, can also be the active filter surface 85, for example, by a perforated plate or single or multi-ply filter fabric made of metal or plastic may be formed, recognize well.
  • FIGS. 6 and 7 show further exemplary embodiments of such filter elements 81 arranged between cylinder head 1.2 and screw plug 61.
  • the filter element 81 is barrel-shaped or toroidal, so that an even greater elasticity and flexibility of the filter element 81 results in the axial direction.
  • the third embodiment according to FIG. 7 has, as shown by the longitudinal section along the line A-A (see FIG. 7c), a "C" shaped longitudinal section.
  • this embodiment of a filter element 81 according to the invention are made from a sheet metal ring or a short pipe section by forming.
  • the active filter surface 85 is disposed in the cylindrical portion of the filter element 81 and may be machined out of the blank of the filter element by, for example, punching or lasering or eroding.
  • the required elasticity is given in the axial direction, so that the compensation of length tolerances is readily possible.
  • the filter element is clamped so to speak resiliently and sealingly between the plug 61 and the cylinder head 1.2.
  • FIG 8 is greatly enlarged the structure of a multi-layer filter fabric shown. It is clear that the multi-layer filter fabric consists of different layers of wire mesh, with wire diameter and the mesh size of the individual layers differ from each other. This makes it possible to optimize the desired stability, the desired filter rate and the desired particle deposition rate. For example, when entering the filter fabric, large particles can be filtered out of the relatively large meshes of the first layer 87.1 and the second layer 87.2. The final Feinstfilterung is made by a third layer 87.3, arriving naturally only smaller particles, so that this third layer 87.3 added only very slowly.
  • FIG. 9 shows a further exemplary embodiment of a filter element 81 according to the invention.
  • This filter element 81 is an annular connecting spacer, which has a "C" -shaped profile in longitudinal section.
  • This annular spacer 91 has approximately the cross section of a "Tiefbettfelge”.
  • an annular filter fabric is crimped.
  • openings 93 are formed with molded passages 95. Number, arrangement and dimensions of the apertures 93 and the passages 95 correspond to those of the communication holes 79 in the valve plate 63 (see, for example, Figure 3 and Figure 10).
  • the intermediate piece 91 has a slot, so that the openings 93 and the passages 95 can be completed outside the suction valve 51 and then this slotted intermediate piece 91 is bent so far until the openings 95 in the connecting holes 79 of the valve plate 63rd engage. Subsequently, the filter cloth 87 is connected by crimping with the intermediate piece 91.
  • the intermediate piece 91 is also possible to form the intermediate piece 91 as a closed ring and initially to produce only the openings 93.
  • formed as a closed ring spacer 91 can be pushed onto the valve plate 63 and the openings 93 arranged concentrically to the connecting holes 69.
  • the passages 95 are now produced by forming. This results in a positive connection between the valve plate 63 and spacer 91.
  • the filter fabric 87 is fixed by crimping on the intermediate piece 91.
  • This embodiment is characterized by a very small space requirement.
  • the active filter surface can be increased again, since it is possible to increase the axial length of the filter cloth 87 significantly, and in particular in the region of the screw plug 61, if in the locking screw 61 has a corresponding recess (not shown) on the front side is trained.
  • the connector 91 serves to stabilize the filter fabric 87, so that it can be optimized only with regard to the filter properties.
  • the intermediate piece 91 can also be made of plastic. In this case, it is recommended to produce the intermediate piece 91 by injection molding on the valve plate. This means that the valve plate is inserted into this injection mold and then the intermediate piece 91 is molded. Subsequently, in a further operation, the filter fabric 87 on the intermediate piece, for example by crimping with a hot tool, which brings the intermediate piece 91 in the region of the axial ends 83 in a plastic state, are attached.
  • FIG. 11 A further exemplary embodiment of a filter element 81 according to the invention is shown in FIG. 11.
  • a circumferential plastic ring 97 is formed at the axial ends 83 of the filter fabric 87 each.
  • these plastic rings each have a detent 99 is formed, the rings a positive connection of the plastic 97 accomplished with the connecting holes 79.
  • the cylindrical filter fabric by ultrasonic welding or another cohesive joining method with the plastic rings 97 are connected.

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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)

Abstract

L'invention concerne une soupape d'aspiration (51) avec un élément filtrant (81) et une pompe haute pression avec un élément filtrant (81) de performance et de durée de vie améliorées.
PCT/EP2010/050565 2009-03-10 2010-01-19 Soupape d'aspiration pour une pompe haute pression de carburant WO2010102850A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10700432A EP2406488A1 (fr) 2009-03-10 2010-01-19 Soupape d'aspiration pour une pompe haute pression de carburant

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009001433A DE102009001433A1 (de) 2009-03-10 2009-03-10 Saugventil für eine Kraftstoffhochdruckpumpe
DE102009001433.0 2009-03-10

Publications (1)

Publication Number Publication Date
WO2010102850A1 true WO2010102850A1 (fr) 2010-09-16

Family

ID=42035814

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/050565 WO2010102850A1 (fr) 2009-03-10 2010-01-19 Soupape d'aspiration pour une pompe haute pression de carburant

Country Status (3)

Country Link
EP (1) EP2406488A1 (fr)
DE (1) DE102009001433A1 (fr)
WO (1) WO2010102850A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013151870A (ja) * 2012-01-24 2013-08-08 Nippon Soken Inc 高圧ポンプ
KR20160090899A (ko) * 2014-09-03 2016-08-01 콘티넨탈 오토모티브 게엠베하 필터를 갖는 고압 연료 펌프

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013207682A1 (de) 2013-04-26 2014-10-30 Robert Bosch Gmbh Hochdruckpumpe für ein Kraftstoffeinspritzsystem
DE102015212162A1 (de) 2015-06-30 2017-01-05 Robert Bosch Gmbh Kraftstoffhochdruckpumpe für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine
DE102015212160A1 (de) 2015-06-30 2017-01-05 Robert Bosch Gmbh Kraftstoffhochdruckpumpe für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine
DE102016202283A1 (de) 2016-02-15 2017-08-17 Robert Bosch Gmbh Filtereinrichtung, insbesondere für Kraftstoffe
DE102017217363A1 (de) * 2017-09-29 2019-04-04 Continental Automotive Gmbh Kraftstoffeinspritzsystem mit Filtration des Kraftstoffs

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB644397A (en) * 1940-04-20 1950-10-11 Int Harvester Great Britain Improvements in or relating to fuel injection pumps
JPH10141178A (ja) 1996-11-12 1998-05-26 Denso Corp 高圧燃料ポンプ
DE102007037084A1 (de) * 2007-08-06 2009-02-12 Robert Bosch Gmbh Kraftstoffhochdruckpumpe

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2567818A (en) * 1949-05-17 1951-09-11 Jet Heet Inc Liquid fuel nozzle
US4832077A (en) * 1988-03-10 1989-05-23 Sloan Valve Company Filtered stop

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB644397A (en) * 1940-04-20 1950-10-11 Int Harvester Great Britain Improvements in or relating to fuel injection pumps
JPH10141178A (ja) 1996-11-12 1998-05-26 Denso Corp 高圧燃料ポンプ
DE102007037084A1 (de) * 2007-08-06 2009-02-12 Robert Bosch Gmbh Kraftstoffhochdruckpumpe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2406488A1 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013151870A (ja) * 2012-01-24 2013-08-08 Nippon Soken Inc 高圧ポンプ
KR20160090899A (ko) * 2014-09-03 2016-08-01 콘티넨탈 오토모티브 게엠베하 필터를 갖는 고압 연료 펌프
KR101907761B1 (ko) 2014-09-03 2018-12-07 콘티넨탈 오토모티브 게엠베하 필터를 갖는 고압 연료 펌프

Also Published As

Publication number Publication date
EP2406488A1 (fr) 2012-01-18
DE102009001433A1 (de) 2010-09-16

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