EP2596231A1 - Kraftstoffinjektor mit hydraulischer kopplereinheit - Google Patents
Kraftstoffinjektor mit hydraulischer kopplereinheitInfo
- Publication number
- EP2596231A1 EP2596231A1 EP11724414.5A EP11724414A EP2596231A1 EP 2596231 A1 EP2596231 A1 EP 2596231A1 EP 11724414 A EP11724414 A EP 11724414A EP 2596231 A1 EP2596231 A1 EP 2596231A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coupler
- piston
- valve piston
- fuel injector
- sleeve
- 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
- F02M63/0014—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
-
- 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
Definitions
- the invention relates to a fuel injector with a hydraulic coupler unit according to the preamble of claim 1.
- a fuel injector in which an injector housing, inter alia, a hydraulic coupler unit is arranged.
- the hydraulic coupler unit comprises a coupler body, in which a coupler piston and a valve piston are each guided axially displaceably, wherein both components define between them a fuel space filled with fuel, which forms a so-called coupler gap volume.
- the coupler piston is in communication with an actuator element whose operation causes a translational movement of the coupler piston in the direction of the pressure chamber against a biasing spring, which is arranged coaxially outside the coupler body and on the one hand a return movement of the coupler piston after the operation and on the other a necessary bias Actuator ensured.
- the overall length of the hydraulic coupler unit is essentially determined by the sum of the lengths of valve piston and coupler piston, d. H. from the lengths of the piston guided in the coupler body. Furthermore, upon pressurization of the coupler gap, a widening of the guide clearance or of the guide gap occurs both on the coupler piston and on the valve piston.
- the object of the present invention is to provide a coupler unit which, on the one hand, has the same functional advantages but, on the other hand, makes it possible to design the components with greater wall thicknesses, thereby reducing the requirements placed on the manufacturing technology for guiding valve pistons and coupler pistons.
- the object of the invention is achieved with the characterizing features of claim 1.
- the main advantage of the coupler unit according to the invention is that no high-precision guides on thin-walled sleeves are required, so that no increased requirements have to be made of the production technology.
- the essence of the invention is that the radial arrangement of coupler body and valve piston undergoes a kind of commutation by the valve piston has a sleeve-shaped guide portion and in the inner bore of the sleeve-shaped guide portion a housing fixedly arranged guide piston of the coupler body is arranged, on which the sleeve-shaped guide section axially is.
- the sleeve-shaped valve piston thus has an annular end surface with an outer diameter d 1 and an inner diameter d3.
- the reduced overall length of the coupler unit is achieved, in particular, by the coupler piston with the diameter d1 being guided in an axially displaceable manner on an outer circumferential surface of the sleeve-shaped guide section of the valve piston.
- the coupler piston with the diameter d1 being guided in an axially displaceable manner on an outer circumferential surface of the sleeve-shaped guide section of the valve piston.
- coupler unit requires that either coupler body or valve piston are to be formed from at least two individual components, because in a respective one-piece design of both components of the valve piston can not be pushed over the guide piston of the coupler body.
- the coupler body has a support section, which is supported on a housing-fixed component, wherein the valve piston is formed with the sleeve-shaped guide section on one side of the support section and with a pressure section on the other side of the support section.
- the head body is made in several parts, with one part forming the guide piston and at least one further part forming the support section. This alternative is carried out, for example, by the support section being designed by a transverse web and a support ring, wherein the crosspiece engages through the valve piston with an axial play.
- the valve piston is designed in several parts with at least one upper part and at least one lower part, the upper part being formed by the sleeve-shaped guide section and the lower part by the pressure section.
- coupling pin are formed between upper part and lower part, which pass through the support portion of the coupler body.
- the support portion is designed with a plate-shaped disc, are formed in the apertures through which engage the coupling pin.
- the coupling pins can be arranged on the sleeve-shaped guide section and / or on the pressure section of the valve piston.
- the coupler gap volume is limited by an inner end wall of the coupler piston, an end face of the guide piston of the coupler body and an annular surface of the sleeve-shaped guide portion of the valve piston. Furthermore, the coupler piston have a collar pointing radially outwards and the coupler body has a further collar pointing radially outwards, against which the pretensioning spring acts in each case under pretensioning.
- FIG. 1 shows a sectional view through a first embodiment of the coupler unit according to the invention
- FIG. 2 shows a sectional illustration through a second embodiment of the coupler unit according to the invention
- FIG. 3 shows a sectional view through a coupler body and a valve piston according to a first embodiment
- FIG. 4 shows a sectional view along the line IV-IV in FIG. 3,
- FIG. 5 shows a sectional view through a coupler body and a valve piston according to a second embodiment
- FIG. 6 shows a side view of the coupler body in FIG. 5
- FIG. 7 shows a view A of the coupler body in FIG. 6, 8 shows a sectional view through the valve piston along line VIII - VIII in Figure 5 and
- FIG. 9 shows a sectional view through the valve piston according to line VIII-VIII without coupler body in FIG. 5.
- the coupler unit 10 of a fuel injector shown in FIGS. 1 and 2 has a coupler body 12 fixedly connected to a housing part 11 of the fuel injector, a cup-shaped coupler piston 13 and a valve piston 14.
- the coupler unit 10 further comprises radially outside of the coupler piston 13, a biasing spring 15, which with the lower end in the drawing plane on a collar 17 of the coupler body 12 and with the opposite, in the drawing plane upper end to another, formed on the coupler piston 13 collar 18th supported, between the further collar 18 and the biasing spring 15, a shim 20 is arranged.
- the biasing spring 15 presses the Kopperkolben 13 via a transmission element, not shown, against an actuator unit, also not shown.
- the biasing spring 15 thereby provides on the one hand for a bias of the coupler piston 13 against the actuator unit and on the other hand provides indirectly for a necessary for the functioning of the controlled by a piezoelectric actuator unit injection system bias of the piezoelectric actuator unit.
- the coupler body 12 connected to the housing part 11 has a guide cylinder 21 with the diameter d3 arranged in the center of the coupler unit 10 and a support part 22 with the collar 17, with which the coupler body 12 rests on the housing part 11.
- the valve piston 14 On the guide cylinder 21 of the coupler body 12, the valve piston 14 is guided at the diameter d3 with a sleeve-shaped portion 23, wherein the sleeve-shaped portion has an outer diameter dl.
- the valve piston 14 also has a pressure section 24, which presses against a valve pin 25 of a valve element, not shown, which controls a control chamber of a nozzle needle of the fuel injector.
- the pressure section 24 is arranged within a recess 26 which is surrounded by the support part 22 of the coupler body 12.
- a compression spring 27 is still within the recess 26 arranged, which is supported on the housing-fixed coupler body 12 and with the opposite end to an annular shoulder 28 which is fixedly connected to the pressure portion 24 of the valve piston 14. By the compression spring 27, the valve piston 14 is pressed onto the valve pin 25.
- the compression spring 27 is disposed between the coupler piston 13 and the valve piston 14, wherein the annular shoulder 28 is formed for supporting the compression spring 27 on the guide portion 23 of the valve piston 14.
- the pot-shaped coupler piston 13 is designed with a cylindrical peripheral wall 31 and a solid, end-side termination 32 with an end wall 33, wherein the cylindrical peripheral wall 31 forms an inner guide surface 34.
- the pot-shaped coupler piston 13 is guided with the inner guide surface 34 at the diameter dl of the sleeve-shaped guide portion 23 of the valve piston 14.
- a pressure chamber 40 is formed, which limits a Kopplerspaltvolumen.
- Translation surface for the coupler unit with the annular surface 36 is thus TT / 4 (dl 2 - d3 2 ).
- valve piston 14 of the present coupler unit 10 The peculiarity of the valve piston 14 of the present coupler unit 10 is that the valve piston 14 with a part above the housing fixed
- FIGS 3 and 4 show an embodiment with a multi-part coupler body 12, this embodiment was used in the embodiment in Figure 1.
- the coupler body 12 in this case has an inner punch 41, a cross strut 42 and a support ring 43, wherein the inner punch 41 is the guide tion cylinder 21 and the cross member 42 and the support ring 43, the support member 22 form.
- the inner punch 41 is designed with a transverse bore 44 for receiving the transverse strut 42.
- the valve piston 14 has at the same height a further transverse bore 45. For assembly of valve piston 14 and Kopplerkör- per 12, the inner punch 41 is first in the inner bore of the valve piston
- the cross member 42 is pushed through the transverse bores 44, 45 of the valve piston 14 and inner punch 41 and firmly connected to the inner punch 41.
- This can be z. B. by performing an interference fit between inner punch 41 and cross member 42 done, or by friction welding, by locking or by gluing.
- the transverse strut 42 is received with an axial clearance 49, so that the valve piston 14 can later freely perform an axial movement.
- the crossbar 42 is finally connected to the support ring 43, for example by welding.
- Figure 5 shows an embodiment with a one-piece coupler body 12 and a multi-part valve piston 14, this embodiment was used in the embodiment in Figure 2.
- the coupler body 12 is designed substantially rotationally symmetrical, wherein on the guide cylinder 21, a plate-shaped disc 51 is formed, which merges in the outer region in a cylindrical support ring 53 see.
- the disk 51 and the support ring 53 form the support member 22.
- a detailed illustration of the coupler body 12 in Figure 5 is apparent from Figures 6 and 7.
- the plate-shaped disk 51 has a plurality of, in the present embodiment, six openings 52 through which, as will be described later, the valve piston 14 is passed.
- the valve piston 14 consists of an upper part 55 and a lower part 56.
- the upper part 55 is formed by the sleeve-shaped guide section 23, which is designed with coupling pin 57 at the end remote from the coupler gap.
- the coupling pin 57 pass through the openings 52, as shown in Figure 8.
- the lower part 56 of the valve piston 14 has a closed end face 58, which projects on a lower side 59 of the dish-shaped disk 51 Coupling pin 57 of the upper part 55 abuts ( Figure 5).
- valve force which is responsible for the refilling of the coupler gap acts on the upper part 55 of the valve piston 14 and the lower part 56 of the valve piston 14 presses in the idle state of the coupler unit 10 against the valve pin 25 of the control valve, not shown.
- the upper part 55 of the valve piston 14 has a depression 60 into which the lower part 56 of the valve piston 14 is received.
- a radial guidance of the lower part 56 on the upper part 55 of the valve piston 14 is achieved.
- a radial clearance between the outer diameter of the lower part 56 and the recess 60 may be provided. But the two diameters can also be designed so that an interference fit between the recess
- the radial guidance of the upper part 55 and the lower part 56 of the valve piston 14 to each other also be done in a different way.
- a covenant on the upper end face of the lower part 56 of the valve piston 14, which includes the upper part 55 called.
- a pin with a diameter on the upper end face of the lower part 56 of the Valve piston 14 is arranged, which is slightly smaller than the diameter d3, wherein the pin projects into the inner bore of the upper part 55 of the valve piston 14.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201010031497 DE102010031497A1 (de) | 2010-07-19 | 2010-07-19 | Kraftstoffinjektor mit hydraulischer Kopplereinheit |
PCT/EP2011/059283 WO2012010368A1 (de) | 2010-07-19 | 2011-06-06 | Kraftstoffinjektor mit hydraulischer kopplereinheit |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2596231A1 true EP2596231A1 (de) | 2013-05-29 |
EP2596231B1 EP2596231B1 (de) | 2014-11-12 |
Family
ID=44246420
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11724414.5A Not-in-force EP2596231B1 (de) | 2010-07-19 | 2011-06-06 | Kraftstoffinjektor mit hydraulischer kopplereinheit |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2596231B1 (de) |
CN (1) | CN103003559B (de) |
DE (1) | DE102010031497A1 (de) |
WO (1) | WO2012010368A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014226673A1 (de) * | 2014-12-19 | 2016-06-23 | Robert Bosch Gmbh | Hydraulische Kopplereinheit zur Steuerung eines Ventils |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4200231A (en) * | 1978-06-19 | 1980-04-29 | General Motors Corporation | Fuel injector nozzle |
DE19940300A1 (de) * | 1999-08-25 | 2001-03-01 | Bosch Gmbh Robert | Steuerventil für einen Injektor |
DE10032517A1 (de) * | 2000-07-05 | 2002-01-24 | Bosch Gmbh Robert | Injektor mit Steuerteilführung |
DE10145620B4 (de) * | 2001-09-15 | 2006-03-02 | Robert Bosch Gmbh | Ventil zum Steuern von Flüssigkeiten |
DE10322672A1 (de) | 2003-05-20 | 2004-12-09 | Robert Bosch Gmbh | Ventil zum Steuern von Flüssigkeiten |
EP1690025B1 (de) * | 2003-12-05 | 2017-05-03 | Continental Automotive GmbH | Vorrichtung, verfahren zum herstellen der vorrichtung, kammervorrichtung und bertragervorrichtung |
DE102004005456A1 (de) * | 2004-02-04 | 2005-08-25 | Robert Bosch Gmbh | Kraftstoffinjektor mit direktgesteuertem Einspritzventilglied |
JP4131251B2 (ja) * | 2004-05-13 | 2008-08-13 | 株式会社デンソー | 燃料噴射装置 |
DE102006050163A1 (de) * | 2006-10-25 | 2008-04-30 | Robert Bosch Gmbh | Injektor mit axial-druckausgeglichenem Steuerventil |
DE102007044361A1 (de) * | 2007-09-17 | 2009-03-19 | Robert Bosch Gmbh | Steuerventil für einen Kraftstoffinjektor |
-
2010
- 2010-07-19 DE DE201010031497 patent/DE102010031497A1/de not_active Withdrawn
-
2011
- 2011-06-06 WO PCT/EP2011/059283 patent/WO2012010368A1/de active Application Filing
- 2011-06-06 EP EP11724414.5A patent/EP2596231B1/de not_active Not-in-force
- 2011-06-06 CN CN201180035478.2A patent/CN103003559B/zh not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2012010368A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN103003559B (zh) | 2016-05-11 |
CN103003559A (zh) | 2013-03-27 |
EP2596231B1 (de) | 2014-11-12 |
WO2012010368A1 (de) | 2012-01-26 |
DE102010031497A1 (de) | 2012-01-19 |
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