EP2438287A1 - Schaltventil - Google Patents
SchaltventilInfo
- Publication number
- EP2438287A1 EP2438287A1 EP10713926A EP10713926A EP2438287A1 EP 2438287 A1 EP2438287 A1 EP 2438287A1 EP 10713926 A EP10713926 A EP 10713926A EP 10713926 A EP10713926 A EP 10713926A EP 2438287 A1 EP2438287 A1 EP 2438287A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- closing body
- seat surface
- valve closing
- piece
- 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.)
- Granted
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
- 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
- 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
- F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
-
- 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
- F02M63/0043—Two-way 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
- 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
- F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
Definitions
- the invention relates to a switching valve, in particular a pressure-balanced valve for fuel injection valves, and a fuel injection valve with such a switching valve.
- the invention relates to the field of injectors for fuel injection systems of air compressing, self-igniting internal combustion engines.
- a fuel injector with a pressure balanced control valve is known.
- an injection valve member which releases or closes the injection port is driven by a control valve, the control valve releasing or closing a connection from a control chamber into a fuel return in which a closing element is seated or released.
- the hydraulic forces are minimized via a pressure compensation.
- the spring force can be reduced with less stroke and larger cross-sectional area. As a result, short switching times and advantageous dynamics are possible.
- the switching valve according to the invention with the features of claim 1 and the fuel injection valve according to the invention with the features of claim 11 have the advantage that a behavior of the switching valve is improved. Specifically, a consistently stable opening behavior of the switching valve can be achieved over the lifetime.
- a sealing seat of the switching valve is realized with a cone pairing of different cone angle.
- an adjustment of the two cones takes place, so that the sealing seat of the valve on the aligned surface of the two cones can shift depending on the applied pressure.
- This happens a change in the opening behavior of the valve and thus, for example, to a change in the injected amount of fuel.
- a fuel injection valve of such a construction there is thus a drift of the injection amount over the lifetime.
- drift is undesirable and there is a desire to minimize such drift.
- a throttle gap in front of the sealing seat can be realized in the course of time during operation, whereby the voltage applied to the sealing seat system pressure is reduced.
- the design of the throttle gap is effected by wear between the valve closing body and the valve seat surface, which is caused at least substantially by abrasion and smoothing of the surfaces (geometric adjustment). This also reduces the range in which a displacement of the effective seat diameter can occur and / or the extent of such a displacement of the effective seat diameter. This is also the case
- the compensation edge of the valve closing body is arranged in front of the sealing seat in a flow direction. Furthermore, it is advantageous that the compensation edge is designed such that a throttle gap is formed in operation between the compensation edge of the valve closing body and the valve seat surface. It is also advantageous that the formed between the compensation edge of the valve closing body and the valve seat surface in operation throttle gap by an operational wear between the valve closing body and the
- Valve seat surface of the valve piece is formed.
- the compensation edge in operation so to speak, strikes against the valve seat surface, resulting in wear due to abrasion and smoothing of the surfaces (geometric adjustment).
- a throttle gap is formed in the region of the compensation edge of the valve closing body.
- the wear-related abrasion can be a few microns of material thickness. This creates a gap in the region of the compensation edge between the valve closing body and the valve seat surface, which acts as a throttle gap during operation.
- the length of this throttle gap can be considered in the flow direction, corresponding to the wear of a few microns.
- the throttle gap viewed in the direction of flow, is arranged in front of the sealing seat, the pressure applied to the sealing seat is reduced.
- a material of the valve closing body and a material of the valve piece are selected on the valve seat surface so that an operational wear between the valve closing body and the valve seat surface of the valve member occurs both on the valve closing body and on the valve piece.
- the valve closing body and the valve piece on the valve seat surface advantageously adjoin one another. As a result, in particular a flow-favorable throttle gap is formed.
- valve closing body has a contact surface which faces the valve seat surface of the valve piece, that the valve closing body cooperates at its contact surface with the valve seat surface to the sealing seat and that the contact surface viewed in a flow direction as a relatively narrow contact surface and / or as an annular contact surface is designed. Furthermore, it is advantageous that the contact surface of the valve closing body is limited by the compensation edge of the valve closing body. This reduces the possible range in which the sealing seat can vary from the outset.
- the compensation edge is formed by a bevel provided on the valve closing body.
- the bevel provided on the valve closing body reduces the range in which the effective seat diameter can vary by the amount of width of the chamfer. This achieves additional stabilization of the opening behavior over the service life.
- the chamfer can be configured, for example, as a ground chamfer.
- valve closing body is on a bolt-shaped
- valve piece has an annular recess, that an inner side of the valve closing body defines a fuel space formed by the puncture, and that a fuel channel guided through the valve piece opens into the fuel chamber.
- annular recess that an inner side of the valve closing body defines a fuel space formed by the puncture, and that a fuel channel guided through the valve piece opens into the fuel chamber.
- Fig. 1 is a switching valve in a partial, schematic sectional view according to an embodiment of the invention in new condition
- Fig. 2 shows the detail shown in Fig. 1 after a certain period of operation.
- Fig. 1 shows an embodiment of a switching valve 1 of a fuel injection valve in a schematic, excerpt, axial sectional view.
- the switching valve 1 is particularly suitable for fuel injection valves of fuel injection systems of air-compressing, self-igniting internal combustion engines.
- a preferred insert is for a fuel injection system having a fuel rail which stores diesel fuel under high pressure and is connected to a plurality of fuel injectors.
- the switching valve 1 according to the invention and the fuel injection valve according to the invention are also suitable for other applications.
- the switching valve 1 has a valve piece 1 and a valve closing body 3.
- the valve closing body 3 may be connected to an armature 4.
- the valve closing body 3 is designed in one piece with the armature 4.
- the valve piece 2 has a bolt-shaped guide section 5, on which the armature 4 is guided along an axis 6 of the switching valve 1.
- the armature 4 is designed axially symmetrical to the axis 6.
- the valve piece 2 is configured at least substantially axially symmetrically with respect to the axis 6.
- the valve piece 2 has an annular recess 7.
- a valve seat surface 8 on the valve piece 2 is formed by the annular recess 7.
- a surface 9 is thereby formed on the valve piece 2.
- the valve seat surface 8 is designed as a conical, annular valve seat surface 8.
- the surface 9 is designed as a conical, annular surface 9.
- the valve seat surface 8 is at least approximately facing the surface 9.
- the valve closing body 3 of the armature 4 has an inner side 10, which surrounds the valve piece 2 circumferentially.
- the inner side 10 of the valve closing body 3 defines an annular fuel formed by the recess 7 cavities 1 1.
- an axial blind bore 12 is configured, from which at least one radial bore 13 branches off.
- the blind bore 12 and the radial bore 13 form a fuel passage 14 of the switching valve 1.
- the radial bore 13 of the fuel channel 14 opens at the annular recess 7 in the fuel chamber 1 1 of the switching valve. 1
- the valve closing body 3 has a contact surface 20.
- the contact surface 20 faces the valve seat surface 8.
- the valve closing body 3 has a compensation edge 21.
- the compensation edge 21 is directed to the valve seat surface 8.
- the valve closing body 3 cooperates with the valve seat surface 8 to form a sealing seat.
- a sealing line, sealing surface or the like of the sealing seat is located in a region 22.
- the compensation edge 21 is located outside the region 22.
- the compensation edge 21 of the valve closing body 3 lies in a flow direction 23 in front of the sealing seat, which lies in the region 22.
- the flow direction 23 is in this case determined such that it at least approximately indicates the flow of the fuel when the sealing seat is open.
- the contact surface 20 is viewed in the flow direction 23 as a relatively narrow contact surface 20 configured.
- the contact surface 20 is configured as an annular contact surface 20.
- the region 22 is set relatively narrow. This favors a constant, stable opening behavior of the switching valve 1 during operation.
- the compensation edge 21 is formed in this embodiment by a provided on the valve closing body 3 chamfer 24.
- the chamfer 24 may be configured, for example, by grinding the valve closing body 3.
- the contact surface 20 is thereby limited by the compensation edge 21.
- Fig. 2 shows the switching valve 1 after a certain period of operation.
- a material of the valve closing body 3 and a material of the valve piece 2 on the valve seat surface 8 are selected so that an operational wear between the valve closing body 3 and the valve seat surface 8 of the valve member 2 occurs both on the valve closing body 3 and the valve piece 2.
- wear occurs in the region of the contact surface 20 of the valve closing body 3 wear, which forms a recess 25.
- wear occurs on the valve seat surface 8, which leads to a recess 26 on the valve seat surface 8. Further wear occurs in the area of the compensation edge 21.
- abrasion occurs during operation, as a result of which an abraded chamfer 27 forms, which is set further back relative to the chamfer 24.
- a step 28 forms in the valve seat surface 8.
- the height of the step 28 may be, for example, a few microns.
- a throttle gap 30 is thereby formed between the abraded chamfer 27 of the valve closing body 3 and the step 28 of the valve seat surface 8.
- the throttle gap 30 may in the Viewed flow direction 23, be a few microns long.
- the throttle gap 30 can be configured at least substantially annularly along the valve seat surface 8.
- the sealing seat formed between the valve closing body 3 and the valve seat surface 8 can come about in the region 22.
- the current position of the pressure in the fuel space 1 1 is dependent.
- the sealing seat is at low pressures closer to the compensation edge 21 and at high pressures closer to an outer edge 29 of the recess 26 of the valve seat 8, that is viewed in the flow direction 23 at the end of the recess 26. Since the contact surface 20 set relatively narrow is, even with the occurring wear of the region 22 in which the sealing seat comes about, relatively small. As a result, the opening behavior is relatively stable.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lift Valve (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910026778 DE102009026778A1 (de) | 2009-06-05 | 2009-06-05 | Schaltventil |
PCT/EP2010/054798 WO2010139500A1 (de) | 2009-06-05 | 2010-04-13 | Schaltventil |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2438287A1 true EP2438287A1 (de) | 2012-04-11 |
EP2438287B1 EP2438287B1 (de) | 2013-06-19 |
Family
ID=42315435
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10713926.3A Active EP2438287B1 (de) | 2009-06-05 | 2010-04-13 | Schaltventil |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2438287B1 (de) |
DE (1) | DE102009026778A1 (de) |
WO (1) | WO2010139500A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102022122501A1 (de) | 2022-09-06 | 2024-03-07 | Zf Cv Systems Europe Bv | Ventil eines Kompressors oder einer Pumpe |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006021741A1 (de) | 2006-05-10 | 2007-11-15 | Robert Bosch Gmbh | Kraftstoffinjektor mit druckausgeglichenem Steuerventil |
DE102007009168A1 (de) * | 2007-02-26 | 2008-08-28 | Robert Bosch Gmbh | Dichtsitz |
DE102007013245A1 (de) * | 2007-03-20 | 2008-09-25 | Robert Bosch Gmbh | Druckausgeglichenes Schaltventil |
DE102007044355A1 (de) * | 2007-06-21 | 2008-12-24 | Robert Bosch Gmbh | Steuerventil für einen Kraftstoffinjektor sowie Kraftstoffinjektor |
DE102008040639A1 (de) * | 2007-10-04 | 2009-04-09 | Robert Bosch Gmbh | Dichtsitz mit Sitzbegrenzung |
-
2009
- 2009-06-05 DE DE200910026778 patent/DE102009026778A1/de not_active Withdrawn
-
2010
- 2010-04-13 WO PCT/EP2010/054798 patent/WO2010139500A1/de active Application Filing
- 2010-04-13 EP EP10713926.3A patent/EP2438287B1/de active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2010139500A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102009026778A1 (de) | 2010-12-09 |
WO2010139500A1 (de) | 2010-12-09 |
EP2438287B1 (de) | 2013-06-19 |
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