EP2602475A1 - Soupape d'injection avec un nouveau groupe de transmission - Google Patents

Soupape d'injection avec un nouveau groupe de transmission Download PDF

Info

Publication number
EP2602475A1
EP2602475A1 EP20120187876 EP12187876A EP2602475A1 EP 2602475 A1 EP2602475 A1 EP 2602475A1 EP 20120187876 EP20120187876 EP 20120187876 EP 12187876 A EP12187876 A EP 12187876A EP 2602475 A1 EP2602475 A1 EP 2602475A1
Authority
EP
European Patent Office
Prior art keywords
piston
region
injection valve
actuator
spring
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Withdrawn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
EP20120187876
Other languages
German (de)
English (en)
Inventor
Alp Durus
Dogan Vardar
Duygu Kandemir
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 EP2602475A1 publication Critical patent/EP2602475A1/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Withdrawn legal-status Critical Current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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • 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
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
    • 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
    • F02M2200/701—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger mechanical
    • 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 present invention relates to an injection valve utilized for spraying fuel to the combustion chamber in internal combustion engines in a controlled manner and having a piezo electric member and a piston group.
  • Said injection valves are used for spraying fuel into the combustion chamber in internal combustion engines.
  • the injection valves are classified according to different operation principles thereof.
  • the injection valves, which have piezo electric members, are called piezo injection valves.
  • Piezo injection valves are essentially described in WO 2005 050003 (A1 ).
  • Piezo injection valves have a piezo electric member which shortens and lengthens with respect to current. Piezo electric members are essentially disclosed in the patent DE 199 46 835 A1 . Said piezo electric member is called actuator in the injection valve.
  • the actuators exist in a bedded manner into the silicon inside a cylindrical bushing. This is disclosed in the patent application DE 102 009 046355 (A1 ). Shoes are placed for transferring the movement at the lower and upper parts of the actuators. The bedding of the actuators inside the shoes is essentially disclosed in the patent application EP 2 031 669 A1 . The actuators shorten and lengthen under a certain current, and movement is transferred to the pistons in order for the drive to be transferred to the needle region.
  • the piston existing in the needle region, increases the movement at a predetermined ratio and it transmits the movement to the valve piston and provides the injection valve to be opened and to begin the spraying process.
  • the pistons existing at the continuation of the actuator, receive the drive from the actuator and they transmit the drive to the needle region.
  • Two pistons which have different diameters and lengths, increase the drive produced by the actuator and they transfer axial movement to the needle region.
  • the liquid compressing characteristic is utilized.
  • the liquid which is compressed by means of pressure by the first piston, forces the second piston to move axially and thus, the second piston is moved.
  • the injection valves having this system are essentially described in the patent FR 2819021 (A1 ).
  • There is a washer at the actuator side of the first piston and said washer helps in providing the sealing.
  • the actuator Since the actuator is connected firstly to a lower shoe and since the drive, produced by the actuator, is transferred to the piston by the additional members existing between the lower shoe and the first piston, damages may occur in the lower shoe and in the additional members and this makes the injection valve useless. Since there is excessive number of members, rigidity is deteriorated during operation. The spring bearing, existing on the piston, can be broken under pressure during operation and because of this, the injection valve becomes useless. Since there are additional members between the pieces which transmit the drive inside the injection valve, the voltage requirement of the injection valve increases. Because of the abovementioned reasons, the production costs of the injection valve increase and moreover, the usage lifetime is shortened.
  • the present invention relates to an injection valve which is used for spraying fuel to the combustion chamber in internal combustion engines and which has a piezo electric member and which has a piston group, in order to eliminate the abovementioned problems and to bring new advantages to the related technical field.
  • the main object of the present invention is to provide an injection valve which has a single piece spring bearing on the piston.
  • Another object of the present invention is to provide an injection valve where the pre-tensioned spring is provided on the actuator.
  • Another object of the present invention is to provide an injection valve whose rigidity is increased and whose voltage requirement is decreased.
  • an injection valve comprising a body; an actuator region having an upper shoe provided in said body, a lower shoe which is provided at a certain distance from said upper shoe, a shell which is provided between said lower shoe and upper shoe; and a piston region having a first piston which is provided so as to receive drive from the lower shoe at the continuation of said actuator region, a second piston which is provided so as to receive drive from said first piston, a chamber which is provided on the body at a vicinity of said second piston, a piston spring which is bedded to the second piston at a vicinity of said chamber.
  • Said injection valve is characterized by comprising at least one drive member which exists in bedded form at a vicinity of said shell and which provides the actuator region to return to the initial position thereof; at least one head which is provided at the first piston and which has at least one recess where the lower shoe can seat; at least one placement part where said head can seat on the body; at least one expansion region which is provided on the head towards said placement part.
  • bearing tab which is provided on the second piston at a vicinity of the chamber and whereon said piston spring can be bedded.
  • said drive member is a spring
  • said spring is bedded in a pre-tensioned manner.
  • said sealing edge comprises a substantially smooth surface by being subject to a mechanical process.
  • an injection valve (10) which has a piezo electric member and which has a piston.
  • an injection valve (10) can be seen.
  • Said injection valve (10) essentially comprises an input region (11) through which the fuel enters into the injection valve (10); a needle region (12) where the fuel in sprayed to the combustion chamber (not illustrated in the figure) by the injection valve (10); an actuator region (20) which is provided between said needle region (12) and said input region (11); a piston region (30).
  • Said actuator region (20), said piston region (30), the needle region (12) and the input region (11) generally exist on a body (13) which has a circular cross section.
  • An upper shoe (21) exists in connected form at the continuation of the input region (11).
  • Said upper shoe (21) has a circular cross section.
  • There is a lower shoe (22) which is connected in connected form at a certain distance in +X direction from the upper shoe (21).
  • Said lower shoe (22) has a circular cross section and the upper shoe (21) and the lower shoe (22) are positioned so as to be coaxial.
  • Said piezo electric member (24) is defined as the actuator.
  • Said actuator (24) has a circular cross section and it is embodied so as to elongate and shorten in X direction under a certain electrical current.
  • the actuator (24) is positioned so as to be coaxial with the shoes (21, 22).
  • Said shell (23) has a hollow circular cross section.
  • the shell (23) is positioned at a vicinity of the outer wall of the actuator (24) so that there is a silicon layer (not illustrated in the figure) between the shell (23) and the actuator (24).
  • the electrical conduction between the actuator (24) and the shell (23) is prevented by said silicon.
  • the actuator (24) and the shell (23) are coaxial.
  • Said drive member (25) is a spring.
  • Said spring (25) is positioned so as to be adjacent to the outer wall of the shell (23).
  • the spring (25) is placed to the actuator region (20) in a pre-tensioned manner together with the welding connections (251).
  • first piston (31) which is in connected form at the continuation of the lower shoe (22). Said first piston (31) is positioned so as to be coaxial with the lower shoe (22).
  • the first piston (31) has a circular cross section with two different diameters.
  • the part where the first piston (31) is in connection with the lower shoe (22) is defined as the head (311).
  • a seating part (312) is embodied at the edge of said head (311) in the - X direction.
  • a recess (314) is embodied so as to correspond to the tab (221) of the lower shoe (22) on said seating part (312).
  • the lower part (315) of the first piston (31) is in connection at the continuation of the head (311) in +X direction.
  • Said lower part (315) is coaxial with the head (311).
  • the diameter of the lower part (315) is embodied so as to be smaller than the head (311) diameter.
  • the narrowing in the diameter is provided by means of a sealing edge (313).
  • Said sealing edge (313) has a right angle with the wall of the head (311) and with the lower part (315).
  • the sealing edge (313) is passed through the stoning process and it has a substantially smooth surface.
  • An expansion region (317) is defined in -X direction of the sealing edge (313). Moreover, the region, where the sealing edge (313) seats on the body (13), is called the placement part (316).
  • a second piston (32) which is in connection at the continuation of the first piston (31).
  • Said second piston (32) has a circular cross section.
  • the second piston (32) is positioned so as to be coaxial with the first piston (31).
  • the second piston (32) has a smaller diameter than the first piston (31).
  • There is a bearing tab (322) which is in connected form to the upper part (321) at the continuation of the second piston (32) in +X direction.
  • Said bearing tab (322) is positioned so as to be adjacent to the wall of the second piston (32), and when viewed from the cross section, it is observed as diameter expansion.
  • a chamber (33) is embodied in the piston region (30) so as to form a movement area to the piston spring (34) and to the bearing tab (322). When viewed from the cross section, said chamber (33) has a rectangular view
  • Injection valves (10) are essentially used in spraying fuel to the combustion chamber (not illustrated in the figure) in internal combustion engines (not illustrated in the figure).
  • the fuel provided by the different members (not illustrated in the figure) of the vehicle, enters into the injection valve (10) through the input region (11) and the pressurized fuel is sprayed to said combustion chamber through the needle region (12) in a controlled manner.
  • complex members (not illustrated in the figure) function together.
  • the three shoes (21) form a connection surface in order for the actuator (24) to stand in a fixed axis.
  • the upper shoe (21) forms a connection surface to the shell (23) and to the spring (25), it facilitates the interruption of the contact of the actuator (24) with the fuel through the -X region.
  • the actuator (24) elongates and shortens under a certain electrical current, and it forms the mechanical drive inside the injection valve (10).
  • the lower shoe (22) provides the drive, produced by the actuator (24), to be transmitted to the piston region (30); and at the same time, it forms a holding surface for the actuator (24), the shell (23) and the spring (25).
  • the shell (23) prevents the contact of the actuator (24) with the fuel and it provides a bearing for the actuator (24).
  • the spring (25) provides the required drive in order for the elongated actuator (24) to return to the initial position thereof.
  • the piston region (30) starts the fuel spraying process by means of the drive received by the actuator region (20) and at the same time, it increases the drive produced by the actuator (24).
  • the first piston (31) takes the drive from the lower shoe (22) from the seating part (312) side.
  • the head (311) provides sealing between itself and the lower part (315). Since the sealing edge (313) is stoned, there is no sealing problem in this part.
  • the lower part (315) provides the drive to be transmitted to the second piston (32).
  • the second piston (32) provides the movement to be transmitted to the needle region (12) and provides the spraying process to be started.
  • the bearing tab (322), existing on the second piston (32), provides bearing for the piston spring (34).
  • the piston spring (34) provides drive formation during the movement of the piston (32) and provides the piston (32) to be drawn to the initial position.
  • the chamber (33) provides the required movement area for the bearing tab (322) and for the piston spring (34) in the piston region (30).
  • the actuator (24) In cases where fuel is to be sprayed to the combustion chamber, electrical current is applied to the actuator (24). Under current, the actuator (24) extends in + X direction and it produces a mechanical drive.
  • the lower shoe (22) moves towards +X direction and it seats to the recess (314) in the seating part (312) of the first piston (31) from the tab and it moves the first piston (31) in + X direction.
  • the first piston (31) seats to the correspondent part (not illustrated in the figure) existing on the body (13) by means of the sealing edge (313).
  • the first piston (31) drives the second piston (32) in a hydraulic manner by means of the lower part (315) thereof and the second piston (32) moves in +X direction.
  • the second piston (32) transmits the drive to the needle region (12) and provides the spraying process to begin.
  • the electrical current applied to the actuator (34) is interrupted and the actuator (24) is shortened in -X direction by means of the spring (25) and it returns to the initial position thereof. Since the drive existing on the pistons (31, 32) is eliminated, the pistons (31, 32) return in -X direction and the drive existing in the needle region (12) is interrupted and the spraying process is ended.
  • the pre-tensioned spring existing in the piston region (30), is taken onto the actuator (24), and in the piston region (30), the shapes of the body (13) and of the pistons (31, 32) are simplified.
  • the spring bearing which is engaged onto the second piston (32) for the piston spring (34) by means of the nailing method in the prior art, is eliminated, and the spring bearing, which is embodied by means of the bearing tab (322) provided on the upper part (321) to the second piston (32), eliminates the rigidity problems which may occur during operation.
  • the general rigidity of the injection valve may decrease and problems may occur during operation. As the number of the pieces decreases, the rigidity of the injection valve (10) is increased and at the same time, the amount of voltage requirement is decreased.
EP20120187876 2011-10-18 2012-10-10 Soupape d'injection avec un nouveau groupe de transmission Withdrawn EP2602475A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TR201110328 2011-10-18

Publications (1)

Publication Number Publication Date
EP2602475A1 true EP2602475A1 (fr) 2013-06-12

Family

ID=47080271

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20120187876 Withdrawn EP2602475A1 (fr) 2011-10-18 2012-10-10 Soupape d'injection avec un nouveau groupe de transmission

Country Status (1)

Country Link
EP (1) EP2602475A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19946835A1 (de) 1999-09-30 2001-02-01 Bosch Gmbh Robert Piezoaktor und ein Verfahren zu dessen Herstellung
FR2819021A1 (fr) 2000-12-28 2002-07-05 Denso Corp Soupape de commande hydraulique et injecteur de carburant utilisant une telle soupape
WO2005050003A1 (fr) 2003-11-14 2005-06-02 Robert Bosch Gmbh Injecteur destine a l'injection de carburant dans les chambres de combustion de moteurs a combustion interne, notamment injecteur a pression modulee (common-rail) commande par un actionneur piezo-electrique
DE102007006942A1 (de) * 2007-02-13 2008-08-14 Robert Bosch Gmbh Injektor mit piezoelektrischem Aktuator
EP2031669A1 (fr) 2007-08-28 2009-03-04 Robert Bosch GmbH Module d'actionneur piézoélectrique comprenant une enveloppe du piézoactionneur et son procédé de fabrication
DE102009029489A1 (de) * 2009-09-16 2011-03-24 Robert Bosch Gmbh Piezoaktormodul und ein Verfahren zu dessen Herstellung
DE102009045556A1 (de) * 2009-10-12 2011-04-14 Robert Bosch Gmbh Injektor
DE102009046355A1 (de) 2009-11-03 2011-05-05 Robert Bosch Gmbh Piezoelektrische Aktor

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19946835A1 (de) 1999-09-30 2001-02-01 Bosch Gmbh Robert Piezoaktor und ein Verfahren zu dessen Herstellung
FR2819021A1 (fr) 2000-12-28 2002-07-05 Denso Corp Soupape de commande hydraulique et injecteur de carburant utilisant une telle soupape
DE10164284A1 (de) * 2000-12-28 2002-07-18 Denso Corp Hydrauliksteuerventil und Kraftstoffeinspritzeinrichtung, die dieses verwendet
WO2005050003A1 (fr) 2003-11-14 2005-06-02 Robert Bosch Gmbh Injecteur destine a l'injection de carburant dans les chambres de combustion de moteurs a combustion interne, notamment injecteur a pression modulee (common-rail) commande par un actionneur piezo-electrique
DE102007006942A1 (de) * 2007-02-13 2008-08-14 Robert Bosch Gmbh Injektor mit piezoelektrischem Aktuator
EP2031669A1 (fr) 2007-08-28 2009-03-04 Robert Bosch GmbH Module d'actionneur piézoélectrique comprenant une enveloppe du piézoactionneur et son procédé de fabrication
DE102009029489A1 (de) * 2009-09-16 2011-03-24 Robert Bosch Gmbh Piezoaktormodul und ein Verfahren zu dessen Herstellung
DE102009045556A1 (de) * 2009-10-12 2011-04-14 Robert Bosch Gmbh Injektor
DE102009046355A1 (de) 2009-11-03 2011-05-05 Robert Bosch Gmbh Piezoelektrische Aktor

Similar Documents

Publication Publication Date Title
JP4384754B2 (ja) 燃料噴射装置
US8240014B2 (en) Method of manufacturing a fuel injector having an encased piezo electric actuator
US10711754B2 (en) Valve assembly having electrical actuator with stepped armature
CN101769217A (zh) 用于内燃机的具有高操作可重复性和高操作稳定性的燃料喷射系统
US9140224B2 (en) Electromagnetic actuator and method for controlling fluid flow
JP4909971B2 (ja) 燃料ポンプの改良点
CN101619664B (zh) 内燃机的气门机构的可控的摇臂的联结装置
US7420316B2 (en) Actuator unit for a piezo-controlled fuel injection valve
CN101568716A (zh) 燃料喷射器
EP2602475A1 (fr) Soupape d'injection avec un nouveau groupe de transmission
EP2857670B1 (fr) Injecteur à carburant
EP0978650B1 (fr) Joint d'étanchéité
US20150021418A1 (en) Lever Device and a Fuel Injection Valve
JP2004515708A (ja) 内燃機関用の燃料噴射装置
WO2013045688A1 (fr) Soupape d'injection comportant un actionneur à bain d'huile et transmission hydraulique simplifiée
WO2012028507A1 (fr) Unité de pompe destinée à l'alimentation en carburant, de préférence du carburant diesel, à un moteur à combustion interne et procédé d'assemblage associé
CN101484687A (zh) 燃料喷射器控制系统和方法
EP3009660B1 (fr) Ensemble de soupape pourvu d'un élément de guidage et injecteur de fluide
CN110475950A (zh) 尤其用于调节内燃机的凸轮轴的电磁调节装置
KR20180091027A (ko) 전자기식으로 작동 가능한 흡입 밸브 및 흡입 밸브를 갖는 고압 펌프
EP3449115B1 (fr) Injecteur de carburant
JP6462546B2 (ja) 燃料噴射弁
GB2539401A (en) Hydraulic lash adjuster arranged in a servo injector
CN103189635A (zh) 燃料喷射器
US9651013B2 (en) Low leakage seat valve guide

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

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

17P Request for examination filed

Effective date: 20131212

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

17Q First examination report despatched

Effective date: 20150512

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: 20170930