EP3358178A1 - Coupleur hydraulique pour un actionneur piézoélectrique, actionneur piézoélectrique - Google Patents

Coupleur hydraulique pour un actionneur piézoélectrique, actionneur piézoélectrique Download PDF

Info

Publication number
EP3358178A1
EP3358178A1 EP18152051.1A EP18152051A EP3358178A1 EP 3358178 A1 EP3358178 A1 EP 3358178A1 EP 18152051 A EP18152051 A EP 18152051A EP 3358178 A1 EP3358178 A1 EP 3358178A1
Authority
EP
European Patent Office
Prior art keywords
piston
guide sleeve
coupler
hydraulic coupler
annular space
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.)
Withdrawn
Application number
EP18152051.1A
Other languages
German (de)
English (en)
Inventor
Hans-Christoph Magel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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
Publication of EP3358178A1 publication Critical patent/EP3358178A1/fr
Withdrawn legal-status Critical Current

Links

Images

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

  • the invention relates to a hydraulic coupler for a piezoelectric injector with the features of the preamble of claim 1. Furthermore, the invention relates to a piezoelectric injector with such a hydraulic coupler.
  • a hydraulic coupler for piezo injectors is known with a coupler housing, in which a first piston and a second piston are slidably disposed, so that between the piston and the coupler housing guide gaps are formed.
  • a liquid cavity is formed, via which the two pistons are hydraulically coupled.
  • the liquid present in the cavity also fills the guide gaps at least partially.
  • At least one piston is designed such that a hollow cylindrical side wall is formed, which deforms outwardly in the cavity when pressure builds up. In this way, a narrowing of the guide gap is brought about, which is intended to counteract leakage.
  • the present invention has the object to effect a reduction of the leakage by alternative measures.
  • a hydraulic coupler is to be created, which also has a long-term high reliability.
  • the hydraulic coupler should be simple and inexpensive to produce.
  • the proposed hydraulic coupler comprises a first piston and a second piston, which are at least partially accommodated in a guide sleeve and guided in a lift-movable manner via the guide sleeve.
  • the two pistons are hydraulically coupled via a coupling volume formed inside the guide sleeve and filled with a fluid.
  • the invention limited at least one piston together with the guide sleeve an annular space which is connected via a guide gap with the coupler volume and a discharge channel with a pressure chamber which is filled with the same fluid.
  • the annular space formed between the piston and the guide sleeve expands the guide gap.
  • the axial distance between a schungsspalterweiternden annulus and the coupler volume is less than 2 mm, preferably less than 1 mm.
  • the axial distance corresponds to the length of the leakage path, thus comparatively is short.
  • a short leakage path also has the advantage that the refilling of the coupler volume with fluid to compensate for the lost amount of leakage is accelerated.
  • the annular space formed between the piston and the guide sleeve divides the guide gap into a first section facing the coupler volume and a second section facing away from the coupler volume, wherein the first section is shorter than the second section.
  • the guide gap connects to the annulus on both sides. In this way, a shortening of the leakage path while maintaining optimum guidance of the piston can be achieved.
  • the annular space is formed by an outer peripheral side formed in the piston annular groove.
  • the outer circumferential side formed in the piston annular groove is easy to manufacture, so that can be realized relatively inexpensively in this way, the annulus.
  • the annular space is formed by a stepped design of the piston and / or the guide sleeve.
  • the stepped design of the piston and / or the guide sleeve leads to an annular space whose size is dependent on the stroke.
  • the dimension of the annulus in the radial direction remains the same, so that the annulus retains its gap-splitting function independent of the stroke of the piston.
  • the guide sleeve is made in several parts.
  • the several parts of the guide sleeve are connected to one another in a fluid-tight manner, so that no fluid escapes from the coupler volume and / or a guide gap in the connection region.
  • the discharge channel connecting the annular space with a pressure chamber can likewise be realized in different ways, for example by means of a longitudinal groove formed in the piston or in the guide sleeve.
  • the piston can also be provided with a polished section, so that in connection with the guide sleeve, an axially extending discharge channel is formed.
  • the discharge channel can be formed by a bore extending radially or obliquely through the guide sleeve. Since the amount of leakage escaping from the coupler volume accumulates in the upstream annular space, the relief can be effected via a single discharge channel whose angular position can be chosen arbitrarily.
  • a piezoelectric injector with a hydraulic coupler according to the invention for the hydraulic coupling of a piezoelectric actuator with a control valve is proposed, by means of which the stroke of a nozzle needle is controllable.
  • a translation of the Aktorhubs can be effected via the hydraulic coupler, so that, if necessary, a smaller actuator can be used.
  • the hydraulic coupler allows compensation of tolerances and / or thermally induced changes in length.
  • the first piston is axially biased by a spring in the direction of the piezoelectric actuator.
  • the bias voltage ensures that the deflection of the piezoelectric actuator is transmitted to the piston during energization.
  • the spring is on the one hand directly or indirectly on the first piston, on the other hand supported on the guide sleeve.
  • the guide sleeve may have a stepped outer contour for supporting the spring.
  • the support on the piston is preferably carried out indirectly via a spring plate connected to the piston and / or a pressure plate.
  • the second piston is axially biased by a spring in the direction of a valve member of the control valve.
  • the bias ensures that the deflection of the piezoelectric actuator is transmitted directly or indirectly to the valve member when energized via the first piston, the coupler volume and the second piston.
  • the transmission from the second piston to the valve member takes place indirectly, for example via a pressure rod.
  • the spring is on the one hand directly or indirectly supported on the second piston, on the other hand on the guide sleeve, which preferably has a stepped inner contour for this purpose.
  • the Support on the second piston can in turn be effected indirectly via a spring plate connected to the piston and / or a pressure plate.
  • the Indian Fig. 1 Piezoinjector 2 shown schematically comprises a nozzle body 21 with a high-pressure bore 22, in which a nozzle needle 17 is received in a liftable manner.
  • the nozzle needle 17 is acted upon in the direction of a sealing seat 32 by the spring force of a nozzle spring 23, which is supported on the one hand on the nozzle needle 17, on the other hand on a sealing sleeve 33 which surrounds the sealing seat 32 remote from the end of the nozzle needle 17.
  • the sealing sleeve 33 and the nozzle needle 17, together with an axially attached to the nozzle body 21 throttle plate 27 define a control chamber 24 which is relieved via a control valve 16.
  • the connection of the control chamber 24 with the control valve 16 via a formed in the throttle plate 27 outlet throttle 28.
  • a piezoelectric actuator 15 is provided, which is accommodated in a holding body 25, in which the pressure chambers 13, 14 are formed.
  • the holding body 25 is axially clamped to the nozzle body 21, the throttle plate 27 and another body member 34 in which the control valve 16 is formed by means of a nozzle lock nut 26.
  • the stroke of the piezoelectric actuator 15 is transmitted or translated by means of a hydraulic coupler 1 to a valve member 20 of the control valve 16.
  • the hydraulic coupler 1 comprises for this purpose a first piston 3, which is axially biased by a spring 18 in the direction of the piezoelectric actuator 15, and a second piston 4, which is axially biased by a spring 19 in the direction of the valve member 20.
  • the two pistons 3, 4 are partially received in a guide sleeve 5, which defines a fluid-filled coupler volume 6 together with the pistons 3, 4. If the piezoelectric actuator 15 is energized, it lasts, moving the first piston 3 in the direction of the second piston 4.
  • the two pistons 3, 4 of the hydraulic coupler 1 each have an outer peripheral side annular groove for forming an annular space 7, 8.
  • the annular space 7, 8 expands the respective guide gap 9, 10.
  • Via relief channels 11, 12, the annular spaces 7, 8 are connected to the pressure chambers 13, 14, so that the leakage path extends only from the coupling volume 6 to an annular space 7, 8. Since the annular spaces 7, 8 are each arranged close to the coupler volume 6, only a very small part of the guide gaps 9, 10 is subject to leakage. That is, only the part undergoes radial expansion due to a pressure increase in the coupler volume 6, so that the leakage is reduced.
  • the upper discharge channel 11 which serves to relieve the upper guide gap 9
  • a radial bore is made in the guide sleeve 5.
  • the lower discharge channel 12, which serves to relieve the lower guide gap 10 is formed by a longitudinal groove running in the piston 4. However, it could behave exactly the other way round or two relief channels 11, 12 could be formed as a radial bore or as a longitudinal groove.
  • FIG. 2 shows another modification of a hydraulic coupler 1 according to the invention or a piezo injector 2 according to the invention.
  • the lower annular space 8 is realized by a stepped embodiment of the piston 4 in conjunction with a stepped embodiment of the guide sleeve 5.
  • An annular groove formed in the piston 4 for forming the annular space 8 is therefore dispensable.
  • the discharge channel 12 is again formed by a longitudinal groove provided in the piston 4.
  • the piston 4 could also be provided with a bevel or the longitudinal groove could be formed in the guide sleeve 5.
  • the upper annular space 7 is formed by an annular groove provided in the piston 3, which is connected via a trained as a longitudinal groove relief channel 11 to the pressure chamber 13.
  • the invention is not limited to the illustrated embodiments and the modifications already discussed in connection therewith, but includes further modifications. These may differ from the illustrated embodiments, in particular with regard to the specific design of the control valve 16 and / or the piezoelectric actuator 15.
  • the connection of the hydraulic coupler 1 to the control valve 16 or to the piezoactuator 15 also depends on their design.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)
EP18152051.1A 2017-02-07 2018-01-17 Coupleur hydraulique pour un actionneur piézoélectrique, actionneur piézoélectrique Withdrawn EP3358178A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017201908.5A DE102017201908A1 (de) 2017-02-07 2017-02-07 Hydraulischer Koppler für einen Piezoinjektor, Piezoinjektor

Publications (1)

Publication Number Publication Date
EP3358178A1 true EP3358178A1 (fr) 2018-08-08

Family

ID=61005728

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18152051.1A Withdrawn EP3358178A1 (fr) 2017-02-07 2018-01-17 Coupleur hydraulique pour un actionneur piézoélectrique, actionneur piézoélectrique

Country Status (2)

Country Link
EP (1) EP3358178A1 (fr)
DE (1) DE102017201908A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999018347A1 (fr) * 1997-10-02 1999-04-15 Robert Bosch Gmbh Soupape de commande de liquides
DE10302863B3 (de) 2003-01-25 2004-09-16 Robert Bosch Gmbh Hydraulischer Koppler für Piezo-Injektoren mit verbesserter Befüllung
WO2006079425A1 (fr) * 2004-11-17 2006-08-03 Robert Bosch Gmbh Système d'injection de carburant
DE102009000833A1 (de) * 2009-02-13 2010-08-19 Robert Bosch Gmbh Kraftstoffinjektor mit Kopplermodul
DE102009029412A1 (de) * 2009-09-14 2011-03-17 Robert Bosch Gmbh Kraftstoffinjektor mit hydraulischer Kopplereinheit
WO2011160900A1 (fr) * 2010-06-23 2011-12-29 Robert Bosch Gmbh Dispositif d'injection de carburant à coupleur hydraulique

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999018347A1 (fr) * 1997-10-02 1999-04-15 Robert Bosch Gmbh Soupape de commande de liquides
DE10302863B3 (de) 2003-01-25 2004-09-16 Robert Bosch Gmbh Hydraulischer Koppler für Piezo-Injektoren mit verbesserter Befüllung
WO2006079425A1 (fr) * 2004-11-17 2006-08-03 Robert Bosch Gmbh Système d'injection de carburant
DE102009000833A1 (de) * 2009-02-13 2010-08-19 Robert Bosch Gmbh Kraftstoffinjektor mit Kopplermodul
DE102009029412A1 (de) * 2009-09-14 2011-03-17 Robert Bosch Gmbh Kraftstoffinjektor mit hydraulischer Kopplereinheit
WO2011160900A1 (fr) * 2010-06-23 2011-12-29 Robert Bosch Gmbh Dispositif d'injection de carburant à coupleur hydraulique

Also Published As

Publication number Publication date
DE102017201908A1 (de) 2018-08-09

Similar Documents

Publication Publication Date Title
EP0952333B1 (fr) Injecteur à combustible pour systèmes d'injection de combustible
EP1853813A1 (fr) Injecteur
EP2715103B1 (fr) Ensemble buse pour un injecteur de carburant et injecteur de carburant
EP3149321B1 (fr) Ensemble d'injection destiné à un injecteur de carburant et injecteur de carburant
EP1692392B1 (fr) Injecteur de carburant a commande de pointeau directe
EP3358178A1 (fr) Coupleur hydraulique pour un actionneur piézoélectrique, actionneur piézoélectrique
EP2218906B1 (fr) Injecteur de carburant
EP1972779B1 (fr) Coupleur hydraulique
EP2930344B1 (fr) Injecteur de carburant
EP2957760B1 (fr) Ensemble de buses pour un injecteur de carburant et injecteur de carburant
EP2905458B1 (fr) Ensemble de buse pour un injecteur de carburant et injecteur de carburant
EP2226490B1 (fr) Injecteur de carburant
EP2199590B1 (fr) Injecteur de carburant
EP3181888B1 (fr) Injecteur de carburant
DE19939478C1 (de) Ventil zum Steuern von Flüssigkeiten
DE102016201539A1 (de) Kraftstoffinjektor
EP2884088B1 (fr) Injecteur de carburant
DE102015218387A1 (de) Hochdruckpumpe mit integriertem Saugventil
EP2256332A2 (fr) Injecteur de carburant doté d'un piston d'amplification de pression
DE102017204644A1 (de) Hydraulische Kopplereinheit und Kraftstoffinjektor
DE102017203152A1 (de) Kraftstoffinjektor
WO2018153596A1 (fr) Injecteur de carburant destiné à injecter un carburant gazeux et/ou liquide
EP2949918A1 (fr) Injecteur de carburant
DE102014209325A1 (de) Kraftstoffinjektor
EP1522720A2 (fr) Amplificateur de pression pour injecteur de carburant comprenant un boitier en plusieurs parties

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20190208

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20190209