EP2165069A1 - Control valve, particularly for a fuel injector of an internal combustion engine - Google Patents
Control valve, particularly for a fuel injector of an internal combustion engineInfo
- Publication number
- EP2165069A1 EP2165069A1 EP08760982A EP08760982A EP2165069A1 EP 2165069 A1 EP2165069 A1 EP 2165069A1 EP 08760982 A EP08760982 A EP 08760982A EP 08760982 A EP08760982 A EP 08760982A EP 2165069 A1 EP2165069 A1 EP 2165069A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- valve piston
- coupler
- piston spring
- notch
- 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
- 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
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
-
- 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
- F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
- F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
Definitions
- Control valve in particular for a fuel injector of an internal combustion engine
- the invention relates to a control valve, in particular for a fuel injector of an internal combustion engine according to the preamble of claim 1.
- Control valves for fuel injectors which are used as servo valves for indirectly controlling a nozzle needle of a fuel injector are known, for example from DE 103 22 672 Al.
- These servo-valves comprise a piezo-actuator, which acts via a coupler module on a valve member which blocks a fluid flow from a valve chamber to a return channel in the closed position and connects the fluid flow from a rear control chamber of the nozzle needle with the return channel by opening a valve seat.
- the coupler connected between the piezoactuator and the valve member comprises a coupler piston guided in a coupler housing and a valve piston, between which there is a coupler gap with a hydraulic cushion as a hydraulic coupler.
- an actuator head is designed with a spherical bearing geometry, which dips into an arcuate, concave depression on an adjusting piece.
- the valve piston must be preloaded by a valve piston spring with a preload of approximately 18N.
- the valve piston spring presses the valve piston against a valve element of a valve member.
- a sleeve is pressed onto the valve piston, on which the valve piston spring is supported on the valve piston side.
- the counter bearing for the valve piston spring forms an annular surface on the coupler housing.
- the object of the invention is achieved with the characterizing features of claim 1. This eliminates the pressed-on the valve piston sleeve for supporting the valve piston spring.
- a conically wound valve piston spring which is supported in a circumferential groove on the valve piston.
- the conically wound valve piston spring engages with the small winding diameter in the groove, so that the groove forms the valve piston-side support for the valve piston spring.
- the recess has an annular bearing surface which extends slightly inclined in the radial direction in the direction of the central axis of the valve piston.
- FIG. 1 shows a sectional view through a fuel injector with a coupler module according to the prior art DE 103 22 672 Al,
- Figure 2 is a sectional view through the fuel injector with a coupler module according to the invention.
- FIG. 3 shows an enlarged section X of the coupler module according to the invention in FIG. 2.
- the fuel injector illustrated in FIGS. 1 and 2 has an injector body 10, a nozzle body 11, a valve plate 12 and a throttle plate 13, which are hydraulically tightly clamped by means of a nozzle clamping nut 15.
- a receiving space 16 and a high pressure bore 17 is formed in the injector body 11.
- a piezoelectric actuator 25 with an actuator base 26 and a coupler module 30 is arranged in the receiving space 16.
- a nozzle needle pressure chamber 18 is formed, in which a nozzle needle 19 is guided axially movable.
- the nozzle needle 19 is exposed at the rear end to a control chamber 20 which is surrounded radially by a control chamber sleeve 21 which hydraulically separates the control chamber 20 from the nozzle needle pressure chamber 18.
- In the nozzle needle pressure chamber 18 performs a guided through the throttle plate 15 high-pressure bore 22 and guided through the valve plate 13 further high-pressure bore 23, which are hydraulically in communication with the high-pressure bore 17.
- About these hydraulic connections stored in the common rail fuel reaches the prevailing system pressure in the nozzle needle pressure chamber 18 to which the nozzle needle 19 is exposed to a pressure shoulder, not shown.
- the coupler module 30 comprises according to Figures 1 and 2, a coupler housing 31, a spring sleeve 32, a coupler piston 33, a valve piston 34, a Ventilkol- benfeder 35 and a shim 36.
- the coupler housing 31 rests with a collar 37 on the valve plate 12. At the collar 37 also engages the spring sleeve 32, on which the shim 36 rests.
- the coupler piston 33 is supported with a Kopplerkolbenbund 38.
- the coupler piston 33 and the valve piston 34 are guided in guides formed on the coupler housing 31, respectively.
- the coupler module 30 with the coupler gap 39 acts as a hydraulic coupler to compensate for elongations of the piezoactuator 25.
- the coupler housing 31 has at the valve member end a filling chamber 47 into which the valve piston 34 protrudes and in which the valve piston spring 35 is arranged.
- an adjusting piece 28 is arranged, on which the actuator head 26 rests with a spherical bearing 29.
- a sleeve 48 on which the valve piston spring 35 is supported on the valve piston side, is pressed against the valve member-side end section of the valve piston 34 which projects into the filling space 47.
- the counter bearing for the valve piston spring 35 forms an annular surface 49 on the coupler housing 31st
- valve member 40 is arranged with a valve element 41 according to Figures 1 and 2.
- the valve element 41 is mounted in a valve chamber 42 and is held by a valve spring 43 against a valve seat 44.
- a valve piston formed on the valve piston 34 acts 45, with which the valve element 41 can be pushed off the valve seat 44.
- the valve piston 34 is biased by the valve piston spring 35 in the direction of the valve element 41.
- valve piston 34 has a notch 50 on a valve-member-side end section.
- the indentation 50 forms on the valve piston 34 a support for the
- Valve piston spring 35 off.
- the support is performed by a circumferential recess 51 with a conical surface 52 and a support surface 53.
- the valve piston spring 35 is designed as a conically wound valve piston spring 54 with a small winding diameter d 1 and a large winding diameter d 2. leads.
- the indentation 50 or the recess 51 is preceded by a further conical section 55 on the valve element side on the valve piston 34.
- the upstream conical section 55 serves as an insertion bevel for the conically wound valve piston spring 54 during assembly of the coupler module 40, as will be described in more detail later.
- the support surface 53 forms an annular surface, the simplest
- the annular bearing surface 53 may also be slightly conical, in such a way that the bearing surface 53 is slightly tilted in the direction of the central axis of the valve piston 34 to the valve end of the Ventilkobens 34 or open to the actuator end of the valve piston 34 back is.
- the conically wound valve piston spring 54 engages better in the notch 50 or in the recess 51. It is furthermore advantageous if the axis of symmetry of the cone runs parallel to the center line of the valve piston 34, wherein the cone angle preferably has an angle of less than 180 ° and greater than 60 °.
- the conically wound valve piston spring 54 is pushed with the large winding diameter d2 ahead of the other conical portion 55, so that the small winding diameter dl of the conically wound valve piston spring 54 at the other conical section
- the conically wound valve spring 54 with the small winding diameter dl rests on the support 52 of the notch 50.
- the support 52 thus forms the valve piston-side abutment for the valve piston spring 54.
- the abutment for the large winding diameter d2 forms the valve piston spring 54, as in the prior art according to FIG. 1, the annular surface 49 formed on the coupler housing 31.
- control chamber 20 is depressurized and the opening forces acting in the opening direction on the pressure shoulder, not shown, of the nozzle needle 19 exceed the closing forces acting in the control chamber 20 so that the fuel is injected from the nozzle needle pressure chamber 18 at system pressure of the common rail.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007032219A DE102007032219A1 (en) | 2007-07-11 | 2007-07-11 | Control valve, in particular for a fuel injector of an internal combustion engine |
PCT/EP2008/057450 WO2009007195A1 (en) | 2007-07-11 | 2008-06-13 | Control valve, particularly for a fuel injector of an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2165069A1 true EP2165069A1 (en) | 2010-03-24 |
EP2165069B1 EP2165069B1 (en) | 2011-04-20 |
Family
ID=39769060
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08760982A Not-in-force EP2165069B1 (en) | 2007-07-11 | 2008-06-13 | Control valve, particularly for a fuel injector of an internal combustion engine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2165069B1 (en) |
AT (1) | ATE506531T1 (en) |
DE (2) | DE102007032219A1 (en) |
WO (1) | WO2009007195A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010029607A1 (en) | 2010-06-02 | 2011-12-08 | Robert Bosch Gmbh | Fuel injector comprises hydraulic coupling module, which has coupling piston and valve piston, which is axially guided in common coupling body, where supply of supply line is interconnected with high pressure line |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB533709A (en) * | 1938-08-13 | 1941-02-19 | Daimler Benz Ag | Improvements in liquid pumps |
DE10203655A1 (en) * | 2002-01-30 | 2004-01-22 | Robert Bosch Gmbh | Fuel injector |
DE10322672A1 (en) | 2003-05-20 | 2004-12-09 | Robert Bosch Gmbh | Valve for controlling liquids |
-
2007
- 2007-07-11 DE DE102007032219A patent/DE102007032219A1/en not_active Withdrawn
-
2008
- 2008-06-13 WO PCT/EP2008/057450 patent/WO2009007195A1/en active Application Filing
- 2008-06-13 DE DE502008003288T patent/DE502008003288D1/en active Active
- 2008-06-13 AT AT08760982T patent/ATE506531T1/en active
- 2008-06-13 EP EP08760982A patent/EP2165069B1/en not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2009007195A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102007032219A1 (en) | 2009-01-15 |
EP2165069B1 (en) | 2011-04-20 |
WO2009007195A1 (en) | 2009-01-15 |
ATE506531T1 (en) | 2011-05-15 |
DE502008003288D1 (en) | 2011-06-01 |
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