DE102004037124A1 - Common rail injector - Google Patents

Common rail injector

Info

Publication number
DE102004037124A1
DE102004037124A1 DE200410037124 DE102004037124A DE102004037124A1 DE 102004037124 A1 DE102004037124 A1 DE 102004037124A1 DE 200410037124 DE200410037124 DE 200410037124 DE 102004037124 A DE102004037124 A DE 102004037124A DE 102004037124 A1 DE102004037124 A1 DE 102004037124A1
Authority
DE
Germany
Prior art keywords
injector
combustion chamber
nozzle needle
actuator
damping
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Withdrawn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
DE200410037124
Other languages
German (de)
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
Priority to DE200410037124 priority Critical patent/DE102004037124A1/en
Publication of DE102004037124A1 publication Critical patent/DE102004037124A1/en
Withdrawn legal-status Critical Current

Links

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
    • F02M2200/30Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/304Fuel-injection apparatus having mechanical parts, the movement of which is damped using hydraulic 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
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/167Means for compensating clearance or thermal expansion
    • 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
    • F02M63/00Other 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
    • F02M63/02Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails

Abstract

The invention relates to a common rail injector with an injector housing (1) having a fuel inlet (26) with a central fuel high pressure source (28) outside of the injector (1) and with a pressure chamber (17) within the injector (1 ), from which, depending on the pressure in a coupling space (25, 39, 41), high-pressure fuel is injected into a combustion chamber of an internal combustion engine when a nozzle needle (8) lifts from its seat, wherein the coupling space is limited by a combustion chamber remote end of the nozzle needle (8) and the combustion chamber near the end of an actuator (30), in particular a piezoelectric actuator, or an attached to the combustion chamber near the end of the actuator actuator head (32). DOLLAR A To allow for a direct nozzle needle control slow opening of the nozzle needle, in the coupling chamber (25, 39, 41) a damping piston (50) is arranged, which limits a damping chamber (54), in which fuel is contained, the pressure acted upon and can escape via a throttle channel (58) in the coupling space when the combustion chamber remote end of the nozzle needle (8) moves toward the actuator (30).

Description

  • The The invention relates to a common rail injector with an injector housing, the having a fuel inlet, with a central high-pressure fuel source outside of the injector housing and communicating with a pressure space within the injector housing in dependence from the pressure in a coupling space, subjected to high pressure Fuel injected into a combustion chamber of an internal combustion engine will if a nozzle needle lifts from its seat, the coupling space of a combustion chamber remote end the nozzle needle and the combustion chamber near the end of an actuator, in particular a piezoelectric actuator, or an attached to the combustion chamber near the end of the actuator actuator head is limited.
  • State of the art
  • If the pressure in the coupling space by an actuator, in particular a Piezo actuator is controlled, it is also called a direct nozzle needle control. To achieve good emission results is a small injection rate advantageous at the beginning of the injection.
  • task The invention is a common rail Inkektor with an injector, the having a fuel inlet, with a central high-pressure fuel source outside of the injector housing and with a pressure space inside the injector housing in Compound stands, from which, depending on the pressure in one Coupling space, high-pressure fuel in a combustion chamber an internal combustion engine is injected when a nozzle needle takes off from its seat, the coupling space away from the combustion chamber End of the nozzle needle and the combustion chamber near the end of an actuator, in particular a piezoelectric actuator, or one attached to the combustion chamber near the end of the actuator actuator head limited, to create, in a direct nozzle needle control a slow opening the nozzle needle allows.
  • Advantages of invention
  • The Task is with a common rail injector, with an injector housing, the having a fuel inlet, with a central high-pressure fuel source outside of the injector housing and communicating with a pressure space within the injector housing in dependence from the pressure in a coupling space, subjected to high pressure Fuel injected into a combustion chamber of an internal combustion engine will if a nozzle needle takes off from its seat, the coupling space away from the combustion chamber End of the nozzle needle and the combustion chamber near the end of an actuator, in particular a piezoelectric actuator, or an attached to the combustion chamber near the end of the actuator actuator head is limited, solved by that arranged in the coupling space a damping piston is that a muffling room limited in which fuel is contained, which pressurizes and over a throttle channel can escape into the coupling space, if the combustion chamber remote end of the nozzle needle moved towards the actuator. In the context of the present invention becomes under direct control of the pressure in the coupling space generating a pressure drop and / or a pressure increase due a volume change, in particular a change in length, understood by the actor. The coupling space is defined by an end face of the Actuator or one coupled to the actuator or on the Actuator attached actuator head limited. That in the coupling room contained fuel volume allows the compensation of thermal expansion and can force / displacement ratio be used. When opening the nozzle needle will fuel over the throttle channel from the damping chamber displaced, thereby a slow opening movement the nozzle needle is reached.
  • One preferred embodiment of the injector is characterized in that the damping piston a filling channel that when closing the nozzle needle an unthrottled connection between the coupling space and the damping chamber allows which is interrupted when the combustion chamber remote end of the nozzle needle moved towards the actuator. The unthrottled connection between the Coupling room and the damping room allows a quick reset of the damper piston. This allows a good injection performance even with several tight successive injections are ensured.
  • One Another preferred embodiment of the injector is characterized in that the throttle channel and the filling channel in the damping piston are formed. As a result, the production of the injector according to the invention is simplified.
  • One Another preferred embodiment of the injector is characterized in that the filling channel is formed by a central through hole in the damping piston. Of the Throttling channel is preferably arranged off-center and runs parallel to the filling channel.
  • Another preferred embodiment of the injector is characterized in that the projecting into the damping chamber end face of the damping piston in the mouth region of the filling channel in the damping chamber spherically ausgebil it is. This ensures that the filling channel is sealed when the mouth area comes to rest on a flat surface.
  • One Another preferred embodiment of the injector is characterized in that in the combustion chamber near End of the actuator or one at the combustion chamber near the end of the actuator attached actuator head a blind hole is recessed, in which the combustion chamber remote end of the damping piston guided is that the damping room limited. The combustion chamber near the end of the damping piston is preferably ge biased the combustion chamber remote end of the nozzle needle.
  • One Another preferred embodiment of the injector is characterized in that remote in the combustion chamber End of the nozzle needle a blind hole is recessed, in which the combustion chamber near the end of the damping piston guided is that the damping room limited. The combustion chamber remote end is preferably located the injector housing in Appendix. The combustion chamber remote end of the damping piston but can also in contact with the actuator or at the end close to the combustion chamber Actuator mounted actuator head are located.
  • One Another preferred embodiment of the injector is characterized in that in the coupling space arranged a damping sleeve is, in which one end of the damping piston is guided, that the damping room limited. Preferably, the damping sleeve has the Shape of a straight circular cylinder shell closed at one end is trained. The closed end of the damping sleeve is preferably located near the combustion chamber End of the actuator or one at the combustion chamber near the end of the actuator attached actuator head on. The combustion chamber near the end of the damping piston is preferably against the combustion chamber remote end of the nozzle needle biased.
  • One Another preferred embodiment of the injector is characterized in that the damping piston is acted upon by a spring device with a spring force, which acts in the axial direction to the combustion chamber. By the spring device is guaranteed that the damping piston can be quickly returned to its original position.
  • One Another preferred embodiment of the injector is characterized in that the spring device in the damping room is arranged. The spring device can also be outside of the damping chamber be arranged.
  • One Another preferred embodiment of the injector is characterized in that the damping piston has a collar on which the spring device is supported. The Spring device can be arranged for example in the coupling space.
  • One Another preferred embodiment of the injector is characterized in that the damping piston a stroke stop for the nozzle needle forms. about the length of the damping piston the stroke stop can be adjusted.
  • One Another preferred embodiment the injector is characterized in that the injector housing a Nozzle body, in the nozzle needle is received, and includes an injector body in which the actuator is received, wherein between the injector body and the nozzle body a intermediate body is arranged. As a result, the production of the injector according to the invention is simplified.
  • One Another preferred embodiment of the injector is characterized in that the coupling space comprises a nozzle needle control chamber, the radially outside bounded by a nozzle needle control chamber limiting sleeve is that at the combustion chamber remote end of the nozzle needle movable back and forth guided is. The limited in the radial direction of the nozzle needle control chamber limiting sleeve Nozzle needle control chamber is in the axial direction through the combustion chamber remote end face of the nozzle needle limited.
  • One Another preferred embodiment of the injector is characterized in that the coupling space comprises an actuator pressure chamber which defines radially outward by a Aktordruckraumbegrenzungshülse is, which at the combustion chamber near the end of the actuator movable back and forth is guided. Preferably, the actuator pressure chamber is connected via a connecting channel, provided in the intermediate body is with the nozzle needle control room in connection. The Aktordruckraum, the connecting channel in the intermediate body and the nozzle needle control room together form the coupling room. Preferably, the piezoelectric actuator constantly energized. If the piezo actuator is relieved, then it sinks the pressure in the actuator pressure space and the nozzle needle control space communicating therewith, so the nozzle needle lifts off from its seat and releases at least one spray hole through the high pressure fuel is injected into the combustion chamber. In a preferred embodiment has the actuator or at the combustion chamber near end Actuator mounted actuator head has a larger outer diameter than the Nozzle needle, so that is a way of translation between actuator and nozzle needle results and the actuator performs less work than the nozzle needle.
  • Other advantages, features and details The invention will become apparent from the following description in which, with reference to the drawings, various embodiments are described in detail. The features mentioned in the claims and in the description may each be essential to the invention individually or in any desired combination.
  • drawing
  • It demonstrate:
  • 1 a first embodiment of a common rail injector according to the invention in longitudinal section;
  • 2 A second embodiment of a common rail injector according to the invention in longitudinal section and
  • 3 a third embodiment of a common rail injector according to the invention in longitudinal section.
  • description the embodiments
  • In 1 a first embodiment of a common rail injector according to the invention is shown in longitudinal section. The illustrated common rail injector has a total of 1 designated injector on. The injector housing 1 includes a nozzle body 2 , which projects with its lower free end into the combustion chamber of the internal combustion engine to be supplied. With its upper, combustion chamber remote end face is the nozzle body 2 by means of a (not shown) clamping nut axially against an intermediate body 3 and an injector body 4 braced.
  • In the nozzle body 2 is an axial guide hole 6 spared. In the guide hole 6 is a nozzle needle 8th guided axially displaceable. At the top 9 the nozzle needle 8th is a sealing edge 10 formed, which with a sealing seat or with a sealing surface 11 cooperates, the or on the nozzle body 3 is trained. If the tip 9 the nozzle needle 8th with its sealing edge 10 in contact with the sealing seat 11 There are spray holes 13 and 14 in the nozzle body 2 locked. If the nozzle needle tip 9 with the sealing edge 10 lifts off from their sealing seat, then high-pressure fuel through the spray holes 13 and 14 injected into the combustion chamber of the internal combustion engine.
  • Starting from the top 9 has the nozzle needle 8th a pressure space section 15 on, which is formed substantially circular cylindrical. On the pressure chamber section 15 follows a truncated cone widening section 16 which is also known as a pressure shoulder. The sections 15 and 16 are, at least partially, in a pressure room 17 arranged between the nozzle needle 8th and the nozzle body 2 is trained. On the truncated cone widening section 16 follows a substantially circular cylindrical guide section 18 , The guide section 18 is in the axial guide hole 6 of the nozzle body 2 guided back and forth. By flattening 19 . 20 at the guide section 18 are formed, a fluid connection between the pressure chamber 17 and a nozzle spring chamber 22 created at the combustion chamber remote end of the nozzle body 2 is provided.
  • The nozzle spring chamber 22 is via a connection channel 24 which is in the intermediate body 3 is formed, with an actuator room 25 in connection. The actuator room 25 In turn, there is an inlet channel 26 with a high-pressure fuel storage 28 in conjunction, which is also referred to as common rail.
  • In the actor room 25 is a piezoelectric actuator 30 arranged at the combustion chamber remote end of an actuator foot 31 attached in sealing manner to the injector body 4 is applied. The injector body 4 is preferably formed in several parts.
  • At its end close to the combustion chamber is on the piezoelectric actuator 30 a piezo actuator head 32 attached, which is also referred to as a coupler piston. The piezo actuator head 32 has essentially the shape of a straight circular cylinder, at its end close to the combustion chamber a Aktordruckraumbegrenzungshülse 34 is guided back and forth movable. Between the Aktordruckraumbegrenzungshülse 34 and the actuator head 32 is sufficient clearance provided so that high-pressure fuel in a Aktordruckraum 35 passes, in the radial direction through the Aktordruckraumbegrenzungshülse 34 is limited.
  • At the combustion chamber remote end of the piezo head 32 is a covenant 36 educated. Between the bunch 36 and the combustion chamber remote end of Aktordruckraumbegrenzungshülse 34 is a helical compression spring 37 biased by the one at the combustion chamber near the end of Aktordruckraumbegrenzungshülse 34 trained biting edge 38 in a sealing manner against the intermediate body 3 is pressed. In the axial direction of the actuator pressure chamber 35 through the piezoelectric actuator 32 and the intermediate body 3 limited.
  • In the intermediate body 3 is a through hole 39 recessed, which the Aktordruckraum 35 with a nozzle needle control chamber 41 which connects in the radial direction of a nozzle needle control chamber limiting sleeve 42 is limited. The Nozzle needle control chamber limiting sleeve 42 has at its combustion chamber remote end a biting edge 43 on and is at a combustion chamber remote end portion 45 the nozzle needle 8th guided. Between the end section 45 and the guide section 18 is at the nozzle needle 8th A bunch 46 educated. Between the bunch 46 and the combustion chamber near the end of the Düsennadelsteuerraumbegrenzungshülse 42 is a nozzle needle spring 47 clamped, the biasing force causes the nozzle needle control chamber limiting sleeve 42 with its biting edge 43 in contact with the intermediate body 3 is held.
  • The actuator pressure room 35 , the through hole 39 and the nozzle needle control room 41 together form a coupler space in which a damping piston 50 is included. The damping piston 50 has essentially the shape of a circular cylinder, at its end remote from the combustion chamber a covenant 51 is trained. The Bund 51 is in a blind hole 52 guided in the axial direction to and fro, in the combustion chamber near the end of the piezoelectric actuator head 32 is provided. The combustion chamber remote end face of the damping piston 50 limited in the blind hole 52 a damping room 54 , In the muffling room 54 is a helical compression spring 56 between the piezo actuator head 32 and the combustion chamber remote end of the damping piston 50 biased.
  • Radially outside the damping piston 50 is in the covenant 51 a throttle channel 58 formed, the a throttled connection between the damping chamber 54 and the actuator pressure room 35 creates. In addition, the damping piston has 50 in the covenant 51 a central filling channel 59 on, which runs in the axial direction. The combustion chamber remote end of the filling channel 58 flows into the damping chamber 54 , The combustion chamber near mouth region of the filling channel 59 is formed spherical and is in contact with the combustion chamber remote end of the nozzle needle 8th ,
  • The piezo actuator 30 is in the actor room 25 surrounded by the rail pressure. At rest of the injector prevails in the damping chamber 54 , the actuator pressure chamber 35 and the nozzle needle control room 41 also rail pressure. The nozzle needle 8th is closed. The piezo actuator 30 is charged at rest and has its maximum longitudinal extent. To control the injector to the piezoelectric actuator 30 discharged and thereby pulls the piezoelectric actuator head 32 back. As a result, the pressure in the coupling space, that of the actuator pressure chamber, decreases 35 , the through hole 39 and the nozzle needle control room 41 is formed. The lowering of the pressure in the coupling space causes the nozzle needle 8th with her tip 9 from the sealing seat 11 takes off and opens. During the opening movement of the nozzle needle 8th gets fuel from the damping chamber 54 over the throttle channel 58 repressed. As a result, a slow needle opening is achieved, which over the cross section of the throttle channel 58 is adjustable. When opening the nozzle needle 8th is the combustion chamber remote end of the nozzle needle 8th in a sealing manner on the combustion chamber near, crowned end face of the damping piston 50 so on, that the fill channel 59 in the damping piston 50 is closed.
  • To close the nozzle needle 8th becomes the piezoelectric actuator 30 loaded again, where it expands. The expansion causes an overpressure to be created in the coupling space which points to the end of the nozzle needle remote from the combustion chamber 8th acts. The overpressure causes the combustion chamber remote end of the nozzle needle 8th from the damping piston 50 separates to close quickly. By the separation between nozzle needle 8th and damping pistons 50 becomes the filling channel 59 released so that the damping chamber 54 over the filling channel 59 can be filled quickly. The damping piston 50 is by the helical compression spring 56 quickly returned to its original position.
  • In a preferred embodiment, the piezoelectric actuator head 32 a larger outer diameter than the end portion 45 the nozzle needle 8th , As a result, a path translation between the piezoelectric actuator 30 and the nozzle needle 8th realized. The piezo actuator 30 performs a lower stroke than the nozzle needle 8th , When retracting the piezo actuator head 32 initially results in an increase in volume in the damping chamber 54 , Eventually raises the damping piston 50 something from the nozzle needle 8th from. This results in a small partial stroke, in which the nozzle needle 8th Performs a rapid opening movement until the damping is effective and dampens the opening speed. Thus, a preferred needle movement is achieved, which leads to the achievement of minimal emissions.
  • In the 2 and 3 Further embodiments of an injector according to the invention are shown in longitudinal section. To designate the same parts, the same reference numerals as in 1 used. To avoid repetition, the preceding description of the 1 directed. In the following, only the differences between the two embodiments will be discussed.
  • At the in 2 illustrated embodiment is a damping piston 60 with its end close to the combustion chamber in a blind hole 62 out in the combustion chamber remote end of the nozzle needle 8th is trained. The damping piston 60 limited in the blind hole 62 a damping room 64 , At the combustion chamber remote end of the damping piston 60 is a covenant 61 educated. Between the bunch 61 and the combustion chamber remote end of the nozzle needle 8th is a helical compression spring 66 biased. The damping piston 60 has an eccentrically arranged and extending in the axial direction throttle channel 68 on, the damper room 64 with the nozzle needle control chamber 41 combines. In addition, the damping piston has 60 a central, in the axial direction extending filling channel 69 on, the mouth region at the combustion chamber remote end of the damping piston 60 is formed spherical. The spherically formed region is close to the intermediate body 3 at. The in 2 shown injector works in the same way as in 1 illustrated injector.
  • At the in 3 illustrated embodiment has a damper piston 70 a covenant 71 on that in a damping sleeve 72 is guided back and forth movable. The damping sleeve 72 has essentially the shape of a circular cylinder, which is closed at one end. The closed end of the circular cylinder is located at the end of the piezoelectric actuator near the combustion chamber 32 at. The damper piston 70 limited in the damping sleeve 72 a damping room 74 , In the muffling room 74 is a helical compression spring 66 between the damping sleeve 72 and the damping piston 70 biased in the axial direction. The damping piston 70 has an eccentrically arranged and extending in the axial direction throttle channel 78 on, the damper room 74 with the through hole 39 in the intermediate body 3 connects, which has a diameter-expanded section 40 having. In the expanded section 40 is the damping sleeve 72 arranged. In addition, the damping piston has 70 a centrally disposed and extending in the axial direction of the filling channel 79 on, the combustion chamber near mouth region is formed spherical. The in 3 shown injector works in the same way as in 1 illustrated injector.

Claims (15)

  1. Common rail injector with an injector housing ( 1 ), which has a fuel feed ( 26 ) provided with a central high-pressure fuel source ( 28 ) outside of the injector housing ( 1 ) and with a pressure chamber ( 17 ) within the injector housing ( 1 ), from which, depending on the pressure in a coupling space ( 25 . 39 . 41 ) is injected with high-pressure fuel into a combustion chamber of an internal combustion engine when a nozzle needle ( 8th ) lifts off its seat, wherein the coupling space of a combustion chamber distal end of the nozzle needle ( 8th ) and the end of an actuator close to the combustion chamber ( 30 ), in particular a piezoelectric actuator, or an actuator head attached to the end of the actuator close to the combustion chamber (( 32 ) is limited, characterized in that in the coupling space ( 25 . 39 . 41 ) a damping piston ( 50 ; 60 ; 70 ) is arranged, the one damping space ( 54 ; 64 ; 74 ), in which fuel is contained, which is pressurized and via a throttle channel ( 58 ; 68 ; 78 ) can escape into the coupling space when the combustion chamber remote end of the nozzle needle ( 8th ) on the actuator ( 30 ) to move.
  2. Injector according to claim 1, characterized in that the damping piston ( 50 ; 60 ; 70 ) a filling channel ( 59 ; 69 ; 70 ), which when closing the nozzle needle ( 8th ) an unthrottled connection between the coupling space ( 25 . 39 . 41 ) and the damping chamber ( 54 ; 64 ; 74 ), which is interrupted when the combustion chamber remote end of the nozzle needle ( 8th ) on the actuator ( 30 ) to move.
  3. Injector according to claim 2, characterized in that the throttle channel ( 58 ; 58 ; 78 ) and the filling channel ( 59 ; 69 ; 79 ) in the damping piston ( 50 ; 60 ; 70 ) are formed.
  4. Injector according to claim 2 or 3, characterized in that the filling channel ( 59 . 69 ; 79 ) from a central through hole in the damping piston (FIG. 50 ; 60 ; 70 ) is formed.
  5. Injector according to one of claims 2 to 4, characterized in that in the damping chamber ( 54 ; 64 ; 74 ) projecting end face of the damping piston ( 50 ; 60 ; 70 ) in the mouth region of the filling channel ( 59 ; 69 ; 79 ) is formed spherically in the damping chamber.
  6. Injector according to one of the preceding claims, characterized in that in the combustion chamber near the end of the actuator ( 30 ) or one attached to the combustion chamber near the end of the actuator actuator head ( 32 ) a blind hole ( 52 ) is recessed in which the combustion chamber remote end of the damping piston ( 50 ) is guided, the damping space ( 54 ) limited.
  7. Injector according to one of claims 1 to 5, characterized in that in the combustion chamber remote end of the nozzle needle ( 8th ) a blind hole ( 62 ) is recessed, in which the combustion chamber near the end of Dämp fungskolbens ( 60 ) is guided, the damping space ( 64 ) limited.
  8. Injector according to one of claims 1 to 5, characterized in that in the coupling space a damping sleeve ( 72 ) is arranged, in which one end of the damping piston ( 70 ) is guided, the damping space ( 74 ) limited.
  9. Injector according to one of the preceding claims, characterized in that the damping piston ( 50 ; 60 ; 70 ) by a spring device ( 56 ; 66 ; 76 ) is acted upon by a spring force which acts in the axial direction towards the combustion chamber.
  10. Injector according to claim 9, characterized in that the spring device ( 56 ; 76 ) in the damping chamber ( 54 ; 74 ) is arranged.
  11. Injector according to claim 9, characterized in that the damping piston ( 60 ) a covenant ( 61 ), on which the spring device ( 66 ) is supported.
  12. Injector according to one of the preceding claims, characterized in that the damping piston ( 50 ; 60 ; 70 ) a stroke stop for the nozzle needle ( 8th ).
  13. Injector according to one of the preceding claims, characterized in that the injector housing ( 1 ) a nozzle body ( 2 ), in which the nozzle needle ( 8th ), and an injector body ( 4 ), in which the actuator ( 30 ), wherein between the injector body ( 4 ) and the nozzle body ( 2 ) an intermediate body ( 3 ) is arranged.
  14. Injector according to one of the preceding claims, characterized in that the coupling space a nozzle needle control chamber ( 41 ) which is radially outwardly through a nozzle needle control space limiting sleeve ( 42 ) is limited, which at the combustion chamber distal end of the nozzle needle ( 8th ) is guided back and forth movable.
  15. Injector according to one of the preceding claims, characterized in that the coupling space is a Aktordruckraum ( 35 ), which radially outward by an Aktordruckraumbegrenzungshülse ( 34 ) is limited, which at the combustion chamber near the end of the actuator ( 30 ) is guided back and forth movable.
DE200410037124 2004-07-30 2004-07-30 Common rail injector Withdrawn DE102004037124A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200410037124 DE102004037124A1 (en) 2004-07-30 2004-07-30 Common rail injector

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE200410037124 DE102004037124A1 (en) 2004-07-30 2004-07-30 Common rail injector
DE200550000548 DE502005000548D1 (en) 2004-07-30 2005-05-13 Common rail injector
EP20050104005 EP1624181B1 (en) 2004-07-30 2005-05-13 Common-Rail Injector

Publications (1)

Publication Number Publication Date
DE102004037124A1 true DE102004037124A1 (en) 2006-03-23

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DE200410037124 Withdrawn DE102004037124A1 (en) 2004-07-30 2004-07-30 Common rail injector
DE200550000548 Active DE502005000548D1 (en) 2004-07-30 2005-05-13 Common rail injector

Family Applications After (1)

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DE200550000548 Active DE502005000548D1 (en) 2004-07-30 2005-05-13 Common rail injector

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DE (2) DE102004037124A1 (en)

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DE102015205929A1 (en) * 2015-04-01 2016-10-06 Continental Automotive Gmbh Control method for a direct drive piezo injector

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DE102005036444A1 (en) * 2005-08-03 2007-02-08 Robert Bosch Gmbh injection
DE102006008648A1 (en) 2006-02-24 2007-08-30 Robert Bosch Gmbh Fuel e.g. diesel or petrol, injecting device for internal combustion engine, has valve unit including control piston and nozzle needle that are coupled with each other by hydraulic coupler, and guiding unit guiding fluid outlet of piston

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DE19962177A1 (en) * 1999-12-22 2001-07-12 Siemens Ag Hydraulic device for transmitting an actuator movement
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EP1555427B1 (en) * 2004-01-13 2007-10-10 Delphi Technologies, Inc. Fuel injector

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Publication number Priority date Publication date Assignee Title
DE102015205929A1 (en) * 2015-04-01 2016-10-06 Continental Automotive Gmbh Control method for a direct drive piezo injector

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Publication number Publication date
EP1624181B1 (en) 2007-04-04
EP1624181A1 (en) 2006-02-08
DE502005000548D1 (en) 2007-05-16

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