DE102011088282A1 - Injector - Google Patents

Injector

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Publication number
DE102011088282A1
DE102011088282A1 DE201110088282 DE102011088282A DE102011088282A1 DE 102011088282 A1 DE102011088282 A1 DE 102011088282A1 DE 201110088282 DE201110088282 DE 201110088282 DE 102011088282 A DE102011088282 A DE 102011088282A DE 102011088282 A1 DE102011088282 A1 DE 102011088282A1
Authority
DE
Germany
Prior art keywords
actuator
opening
nozzle needle
injection valve
longitudinal axis
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Withdrawn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
DE201110088282
Other languages
German (de)
Inventor
Jignesh Jagani
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.)
Continental Automotive GmbH
Original Assignee
Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to DE201110088282 priority Critical patent/DE102011088282A1/en
Publication of DE102011088282A1 publication Critical patent/DE102011088282A1/en
Withdrawn legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603Injectors peculiar thereto with means directly operating the valve needle using piezo-electric or magnetostrictive operating means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/70Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/70Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • F02M2200/704Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with actuator and actuated element moving in different directions, e.g. in opposite directions

Abstract

An injection valve comprises: an actuator (101) designed to exert a stroke along a longitudinal axis (L), an axially movably arranged nozzle needle (103), a hydrostatic lever device (110) connected to a first end (111 ) is coupled to the actuator (101) and to a second end (112) with the nozzle needle (103) to transmit the stroke of the actuator (101) to the nozzle needle (103).

Description

  • The invention relates to an injection valve, in particular an injection valve for an internal combustion engine of a motor vehicle.
  • Injection valves for an internal combustion engine of a motor vehicle may have actuators which are designed in particular as piezoactuators. Such actuators have a piezoceramic material. The actuators may change their longitudinal extent, depending on an electric field acting in the piezoceramic material. Piezoelectric actuators, which are used as actuators, in particular in injection valves for internal combustion engines in motor vehicles, are arranged in a housing so that a lifting movement in the axial direction can be performed.
  • It is desirable to provide an injector that allows reliable operation.
  • According to one embodiment of the invention, an injection valve comprises an actuator which is designed to exert a stroke along a longitudinal axis. The injection valve further has an axially movably arranged nozzle needle. The injection valve comprises a hydrostatic lever device. The hydrostatic lever device is coupled to the actuator at a first end. The hydrostatic lever device is coupled to the nozzle needle at a second end. The hydrostatic lever device is adapted to transmit the actuator force to the nozzle needle.
  • The hydrostatic lever device is arranged in the injection valve so that it translates a stroke of the actuator. By the hydrostatic lever device, the stroke of the actuator is amplified so that the nozzle needle due to the stroke of the actuator covers a greater distance than the stroke of the actuator. Thus, a directly driven injection valve is enabled, which allows a reliable fast opening and closing of the injector. It is also possible to evaluate the actuator signal, for example, the voltage and / or capacity of the actuator, for example, to determine the opening of the injector or the time of closing. Thus, the injection valve is effectively and reliably controlled. In addition, the friction of the movement is reduced by the use of the hydrostatic lever device with a liquid as a transmission medium.
  • According to embodiments, the lever device comprises a housing, which surrounds a chamber for receiving a liquid with a first and a second opening. The lever device comprises a first pin, which is arranged axially movable in the first opening and which is coupled to the actuator. The lever device comprises a second pin, which is arranged axially movable in the second opening and which is coupled to the nozzle needle. The first pin has a larger area in cross section to the longitudinal axis than the second pin. The pins are in particular movable in each case in the direction of the longitudinal axis. The nozzle needle is movable in particular along the longitudinal axis.
  • In operation, the stroke of the actuator is transmitted to the first pin so that it moves in a first direction. The liquid is displaced from the first opening. The displaced liquid pushes the second pin out of the second opening. The movement of the second pin moves the nozzle needle. Characterized in that the first pin has a larger area transverse to the longitudinal axis than the second pin, the movement of the first pin causes a movement of the second pin over a greater distance than the first pin travels.
  • According to embodiments, the housing surrounds the chamber such that the first and second openings are spaced apart from one another elongate rectified to the longitudinal axis and between the first and second openings a connecting line is arranged which hydraulically couples the first opening to the second opening and which is aligned transversely to the longitudinal axis. Thus, it is possible that a stroke of the actuator is transmitted in the direction of the valve needle by the hydrostatic lever device so that the nozzle needle is moved in the direction opposite to the stroke. The nozzle needle is moved in the direction of the actuator.
  • The actuator is in particular a piezoelectric element, in particular a piezoceramic element. The actuator uses, for example, the piezoelectric effect to perform by applying an electrical voltage, the hub, so a mechanical movement.
  • Further advantages, features and developments emerge from the following examples explained in conjunction with the figures. The same, similar and equally acting elements may be provided in the figures with the same reference numerals. The illustrated elements and their proportions to each other are basically not to be considered as true to scale.
  • Show it:
  • 1 a schematic representation of an injection valve according to an embodiment,
  • 2 a portion of a housing of an injection valve according to an embodiment, and
  • 3 a coupling element of an injection valve according to one embodiment.
  • 1 shows a schematic cross-sectional view of a section of an injection valve 100 , The injection valve 100 is designed in particular as an injection valve for an internal combustion engine of a motor vehicle.
  • The injection valve 100 has an actuator 101 on. The actuator 101 is in particular a piezoactuator with a piezoelectric element 102 , The actuator 101 is by means of a pen 105 with a coupling element 121 coupled.
  • The coupling element 121 is in the illustrated embodiment with two pins 118 coupled. The two pens 118 are each in a first opening 116 axially in the direction of a longitudinal axis of the injection valve 100 movably arranged. The first openings 116 each of a common housing 113 surround. The first opening 116 is each part of one with a liquid 115 filled chamber 114 , The housing 113 surround the chambers 114 each so that the chambers 114 each a second opening 117 exhibit. The housing 113 surround the chambers 114 each so that between the first opening 116 and the second opening 117 a connection line 120 is arranged, which is the first opening 116 and the second opening 117 couple hydraulically.
  • In the second opening 117 is a second pen each 119 arranged axially movable in the direction of the longitudinal axis L. The second pens 119 are each with a broad expanse end 104 a nozzle needle 103 coupled. The end area 104 jumps across the main part of the nozzle needle 103 in front.
  • The injection valve 100 thus points between the actuator 101 and the nozzle needle 103 a hydrostatic lever device 110 on that a hub of the actuator 101 on the nozzle needle 103 transfers. The hydrostatic lever device 110 is with a first end 111 mechanically with the actuator 101 coupled. The hydrostatic lever device 110 is with a second end 112 mechanically with the nozzle needle 103 coupled.
  • The hydrostatic lever device 110 is designed so that the first pin 118 transverse to the longitudinal axis L has a larger area than the second pin 119 , Thus, the second pen 119 with a shift of the first pen 118 shifted by a first distance by a distance that is greater than the first distance. This makes it possible, the nozzle needle 104 to move a greater distance than the stroke of the piezoelectric element 102 , As a result, smaller and thus more cost-effective piezoelectric elements can be used and yet is a reliable operation with a sufficient valve opening by a sufficiently large movement of the nozzle needle 103 possible.
  • The liquid 115 is especially diesel or gasoline. The liquid 115 is in particular of the same type as the liquid passing through the injector 100 is injected into the internal combustion engine.
  • According to embodiments, between the housing 113 and the first pen 118 a feather 106 arranged, which is adapted to a spring force in the direction of the first pin 118 exercise. The feather 106 pushes the first pin 118 during a closing operation of the injection valve 100 in the direction of the coupling element 121 , This is also the case for the second pen 119 possible during the closing process in the direction away from the coupling element 121 to move. Thus, it is possible for the nozzle needle to move in the direction away from the coupling element in the closed position. By the spring 106 becomes the movement of the first pen 118 supported and thus is the injection valve 100 good and reliable closable. In addition, by the spring 106 the first pen 118 whenever possible in contact with the coupling element 121 ,
  • According to embodiments, between the second pin 119 and the housing 113 another spring 107 arranged, which is adapted to a spring force in the direction of the second pin 119 exercise. By the spring 107 becomes the second pen 119 whenever possible in contact with the end area 104 the nozzle needle 103 held. This is a precise and reliable operation of the injector 100 possible.
  • According to embodiments, the housing 113 from two separately manufactured parts 108 and 109 manufactured. That the actuator 101 facing item 108 surrounds the two openings 116 and 117 For example, through two holes in the item 108 are introduced. That the actuator 101 remote item 109 has a notch, so if the two items 108 and 109 are in working order in contact with each other, the connecting line 120 between the first opening 116 and the second opening 117 is trained.
  • According to embodiments, the first opening extend 116 and the second opening 117 rectified to the longitudinal axis L and the connecting line 120 transverse to the longitudinal axis L. This will cause a stroke of the actuator 101 in the direction of the nozzle needle 103 through the hydrostatic lever device 110 so on the nozzle needle 103 Transfer that to the nozzle needle 103 in the direction of the actuator 101 moved and the injector 100 For example, it opens.
  • The coupling element 121 between the actuator 101 and the first pen 118 has in the illustrated embodiment, a transversely to the longitudinal axis L area expanded body 122 on. The main body 122 is always in contact with the pen when in operation 105 , The coupling element 121 has at its spaced from the longitudinal axis L end one in each case in the direction of the nozzle needle 103 projecting area 123 on, each with the first pen 118 is coupled.
  • The coupling element 121 has a shape that allows the nozzle needle 103 in the direction of the coupling element 121 moves while the coupling element 121 simultaneously in the direction of the nozzle needle 103 emotional. In particular, between the coupling element 121 and the end area 104 the nozzle needle 103 a gap.
  • The volume of the chamber 114 is chosen to be relatively small, allowing the transmission of movement from the first pin 118 on the second pen 119 essentially happening at the same time without delay. Thus, a fast opening and closing of the injector 100 possible. This makes it possible to evaluate actuator signals such as voltage, current or capacity and, for example, for the control of the injection valve or control of the injection valve 100 to use.
  • Between the case 113 and the first pen 118 or the second pin 119 There is a narrow gap provided by the fluid from the chamber 114 can escape or into the chamber 114 can occur. However, this has no influence on the immediate transmission of the stroke of the actuator 101 on the nozzle needle 103 , The injection valve 100 has no switching leakage such as injectors with servo drive. Servo-operated injectors have a switching leak when the actuator is activated and the servo valve is open. Energy is lost through this leakage. The injection valve 100 has no valve corresponding to a servo valve and thus has no switching leakage.
  • By using the hydrostatic lever device 110 with the liquid 115 as a transmission medium friction losses are reduced compared to mechanical levers.
  • Characterized in that the coupling element 121 through the spring 106 in contact with the pen 105 is held, arises between the coupling element 121 and the pen 105 no gap. Thus, accurate and reliable operation of the injector 100 possible.
  • According to embodiments, the first pin 118 and the second pen 119 each have a cylindrical shape. According to further embodiments, the pins 118 and 119 another form, which makes it possible to displace liquid or from the liquid 115 to be displaced.
  • The shape of the openings 116 and 117 depends on the shape of the pins 118 and 119 , The cross section of the pen 118 and the first opening 116 are so matched to each other, that between the pin 118 and the housing 113 a small gap of, for example, between 3 and 4 microns is formed. The cross section of the second pen 119 and the second opening 117 are coordinated so that between the second pin 119 and the housing 113 a small gap of, for example, between 3 and 4 microns is arranged.
  • According to embodiments, the coupling element 121 and the first pen 118 separate components that are movable relative to each other. During operation of the injector 100 It is possible that a small gap between the coupling element 121 and the first pen 118 occurs, so that the coupling element 121 and the first pen 118 Do not touch for a small period of time.
  • According to further embodiments, the coupling element 121 and the first pen 118 firmly connected to each other so that they are not movable relative to each other.
  • The housing 113 is integrally formed according to embodiments.
  • On one or both of the feathers 106 and 107 is omitted according to embodiments.
  • 1 only shows elements of the injection valve 100 in particular, the hydrostatic lever device 110 to describe. In operational state, the injection valve has 100 other components not shown, such as a spring, the nozzle needle 100 towards the actuator 101 presses to the nozzle needle 100 to press into its closed position and the injection valve 100 close.
  • 2 shows by way of example a further embodiment of the embodiment of the first opening 116 and the second opening 117 , These each have a deviating from a circular shape. The first opening 116 and the second opening 117 each have a kidney shape.
  • 3 shows an example of another embodiment of the coupling element 121 with the projecting areas 123 , The projecting areas 123 are according to embodiments simultaneously the first pins 118 and for example in the first opening 116 of the item 108 of the housing 113 according to 2 arranged.

Claims (6)

  1. Injection valve, comprising: - an actuator ( 101 ), which is designed to exert a stroke along a longitudinal axis (L), - an axially movable nozzle needle ( 103 ), - a hydrostatic lever device ( 110 ) with a first end ( 111 ) with the actuator ( 101 ) and with a second end ( 112 ) with the nozzle needle ( 103 ) is coupled to the stroke of the actuator ( 101 ) on the nozzle needle ( 103 ) transferred to.
  2. Injection valve according to Claim 1, in which the hydrostatic lever device ( 110 ) comprises: - a housing ( 113 ), which has a chamber ( 114 ) for receiving a liquid ( 115 ) with a first ( 116 ) and a second ( 117 ) Opening surrounds, - a first pin ( 118 ) in the first opening ( 116 ) is arranged axially movable and with the actuator ( 101 ), - a second pin ( 119 ) located in the second opening ( 117 ) is arranged axially movable and with the nozzle needle ( 103 ), the first pen ( 118 ) has a larger area transverse to the longitudinal axis (L) than the second pin ( 119 ).
  3. Injection valve according to Claim 2, in which the housing ( 113 ) the chamber ( 114 ) surrounds so that the first ( 116 ) and the second ( 117 ) Opening spaced apart from each other elongated in the direction of the longitudinal axis (L) are formed and between the first ( 116 ) and the second ( 117 ) Opening a connecting line ( 120 ) is arranged, which the first opening ( 116 ) hydraulically with the second opening ( 117 ) and which is aligned transversely to the longitudinal axis (L).
  4. Injection valve according to claim 2 or 3, comprising: - a coupling element ( 121 ) with a transversely extended to the longitudinal axis (L) body ( 122 ) and a projecting in the direction of the longitudinal axis (L) area ( 123 ), where the basic body ( 122 ) mechanically with the actuator ( 101 ) and the projecting area ( 123 ) mechanically with the first pin ( 118 ) is coupled.
  5. Injection valve according to one of claims 2 to 4, wherein the nozzle needle ( 103 ) a transversely extended to the longitudinal axis end region ( 104 ), wherein the second pin ( 119 ) on the actuator ( 101 ) facing away from the end region ( 104 ) mechanically with the end region ( 104 ) is coupled.
  6. Injection valve according to one of claims 1 to 5, in which the actuator ( 101 ) a piezoelectric element ( 102 ) having.
DE201110088282 2011-12-12 2011-12-12 Injector Withdrawn DE102011088282A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE201110088282 DE102011088282A1 (en) 2011-12-12 2011-12-12 Injector

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE201110088282 DE102011088282A1 (en) 2011-12-12 2011-12-12 Injector
DE201211005186 DE112012005186A5 (en) 2011-12-12 2012-12-05 Injector
PCT/EP2012/074479 WO2013087475A1 (en) 2011-12-12 2012-12-05 Injection valve

Publications (1)

Publication Number Publication Date
DE102011088282A1 true DE102011088282A1 (en) 2013-06-13

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ID=47297270

Family Applications (2)

Application Number Title Priority Date Filing Date
DE201110088282 Withdrawn DE102011088282A1 (en) 2011-12-12 2011-12-12 Injector
DE201211005186 Pending DE112012005186A5 (en) 2011-12-12 2012-12-05 Injector

Family Applications After (1)

Application Number Title Priority Date Filing Date
DE201211005186 Pending DE112012005186A5 (en) 2011-12-12 2012-12-05 Injector

Country Status (2)

Country Link
DE (2) DE102011088282A1 (en)
WO (1) WO2013087475A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4858439A (en) * 1987-03-03 1989-08-22 Toyota Jidosha Kabushiki Kaisha Device for varying a stroke
EP0477400A1 (en) * 1990-09-25 1992-04-01 Siemens Aktiengesellschaft Device for compensating the tolerance in the lift direction of the displacement transformer of a piezoelectric actuator
DE19950760A1 (en) * 1999-10-21 2001-04-26 Bosch Gmbh Robert Fuel injection valve esp. for fuel injection systems of IC engines with piezo-electric or magneto-strictive actuator and valve closing body operable by valve needle working with valve
DE10162045A1 (en) * 2001-12-17 2003-06-26 Siemens Ag Actuator deflection transmission device has tensioning device in form of clamping spring between casing and second piston

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19519191C2 (en) * 1995-05-24 1997-04-10 Siemens Ag Injector
DE19709795A1 (en) * 1997-03-10 1998-09-17 Bosch Gmbh Robert Fuel injection valve for internal combustion engines
DE10100392C1 (en) * 2001-01-05 2002-06-13 Bosch Gmbh Robert Fluid control valve for IC engine fuel injection has setting piston and operating piston received in adjacent bores in valve body
WO2005026531A1 (en) * 2003-09-10 2005-03-24 Siemens Aktiengesellschaft Injection valve for injecting fuel into an internal combustion engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4858439A (en) * 1987-03-03 1989-08-22 Toyota Jidosha Kabushiki Kaisha Device for varying a stroke
EP0477400A1 (en) * 1990-09-25 1992-04-01 Siemens Aktiengesellschaft Device for compensating the tolerance in the lift direction of the displacement transformer of a piezoelectric actuator
DE19950760A1 (en) * 1999-10-21 2001-04-26 Bosch Gmbh Robert Fuel injection valve esp. for fuel injection systems of IC engines with piezo-electric or magneto-strictive actuator and valve closing body operable by valve needle working with valve
DE10162045A1 (en) * 2001-12-17 2003-06-26 Siemens Ag Actuator deflection transmission device has tensioning device in form of clamping spring between casing and second piston

Also Published As

Publication number Publication date
DE112012005186A5 (en) 2014-09-11
WO2013087475A1 (en) 2013-06-20

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Legal Events

Date Code Title Description
R012 Request for examination validly filed
R016 Response to examination communication
R118 Application deemed withdrawn due to claim for domestic priority
R118 Application deemed withdrawn due to claim for domestic priority

Effective date: 20140612