EP3141738A1 - Rattrapeur de jeu hydraulique disposé dans un servo-injecteur - Google Patents

Rattrapeur de jeu hydraulique disposé dans un servo-injecteur Download PDF

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Publication number
EP3141738A1
EP3141738A1 EP16187250.2A EP16187250A EP3141738A1 EP 3141738 A1 EP3141738 A1 EP 3141738A1 EP 16187250 A EP16187250 A EP 16187250A EP 3141738 A1 EP3141738 A1 EP 3141738A1
Authority
EP
European Patent Office
Prior art keywords
lower piston
piston
hla
cup
peripheral wall
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Withdrawn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
EP16187250.2A
Other languages
German (de)
English (en)
Inventor
Alexandre TORRESANI
Christophe Tapin
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.)
Delphi Technologies Inc
Original Assignee
Delphi Technologies Inc
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 Delphi Technologies Inc filed Critical Delphi Technologies Inc
Publication of EP3141738A1 publication Critical patent/EP3141738A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic 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
    • 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
    • F02M2200/705—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with means for filling or emptying hydraulic chamber, e.g. for compensating clearance or thermal expansion
    • 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

Definitions

  • the present invention relates to a hydraulic lash adjuster that is arranged in a servo injector.
  • Servo injectors provided with piezo or magneto restrictive actuator are provided with hydraulic lash adjuster (HLA) in order to transmit force of displacement from the actuator to a control valve, while compensating for minor dimensional variations due to wear or heat dilation. Therefore, the control valve commutes between an open position where pressure drops in a control chamber enabling injection event and, a closed position where said pressure rises forbidding fuel injection event.
  • HLA hydraulic lash adjuster
  • Application GB1420017 filed 11 Novembre 2014 discloses a compact HLA having a cup-like shape lower piston within which is slidably engaged with clearance fit an upper piston.
  • the hydraulic volume and the internal volume between the pistons at the bottom of the cup-like shape are filled with fuel, an internal spring being arranged in said volume compressed between the bottom face of the lower piston and the under face of the upper piston.
  • the internal spring is positioned at the bottom of the cup-like shape which is filled with fuel prior to engaging the upper piston and, when further engaging the upper piston, the fuel evacuates with difficulty through the small clearance between said two pistons.
  • a hydraulic lash adjuster adapted to be arranged in a hydraulic volume interposed between the actuator and the control valve assembly of a servo injector
  • the HLA comprising a cup-like shape lower piston having a cylindrical peripheral wall open at one end and closed by a bottom wall at the other end, an upper piston slidably guided with clearance fit in the cup-like shape lower piston, an internal spring compressed between the bottom face of the lower piston and the under face of the upper piston.
  • the HLA is further provided with at least one spill hole provided through the peripheral wall of the lower piston.
  • the at least one spill hole is at a distance from the bottom wall of the lower piston so that, in use, the hole is closed by the upper piston, said distance being slightly superior to the distance between the bottom wall of the lower piston and the under face of the upper piston.
  • the lower piston may be further provided with a plurality of spill holes arranged on the peripheral wall, each hole being arranged at a distance superior or equal to said minimized distance.
  • the spill holes have a diameter comprised between 1 ⁇ m and 300 ⁇ m.
  • the invention further extends to a method to assemble a HLA as described above, the method comprising the steps of:
  • Figure 1 represents a servo fuel injector 10 which extends generally along a main axis A1 from an injector head 12, arbitrarily drawn at the top of the figure, to an injector nozzle 14, drawn at the bottom of the figure.
  • the injector 10 mainly comprises an injector body 16 constituted of the assembly of several components fixed to each other and, in said body 16 are arranged, from head 12 to nozzle 14, a servo actuator 18, that is either a piezo or a magneto restrictive actuator, a hydraulic lash adjuster (hereafter HLA) 20, a control valve assembly 22 and a needle valve 24.
  • electrical links 26 are provided to energize the servo actuator 18, said electrical links extending from the actuator 18 to a connector 28 arranged on the injector head 12 of the injector 10.
  • the actuator 18 and the control valve assembly 22 extend along a second axis A2 parallel and offset for the main axis A1 that is also the axis of the needle valve 24.
  • the injector body 16 further accommodates a high pressure circuit 34, extending from an inlet 36 arranged in the injector head 12 to a plurality of spray holes 38 arranged a the tip of the nozzle 14 and, a low pressure return circuit 40 extending from the control valve 22 to an outlet 42 also arranged in the head 12 of the injector.
  • the high pressure circuit 34 and the low pressure circuit 40 interconnect in the area of the control valve 22.
  • the "high pressure” is typically superior to 2000 bars, or 2500 bars or even 3000 bars.
  • the HLA 20 is arranged in a volume V that, in use, is filled with fuel.
  • the HLA 20 is now described in reference to figure 2 where it axially extends along the second axis A2 and it comprises an upper piston 46 having a cylindrical body 48 covered by a head cap 50 radially extending beyond the peripheral edges of cylindrical body 48.
  • the upper piston 46 is axially slidably arranged in cup-like lower piston 52.
  • Said lower piston 52 has a peripheral cylindrical wall 54 defining an internal bore, and a bottom wall 58 forming the cup-like shape.
  • the spill hole 60 has a diameter D of few tens of micrometers and it is arranged at distance X from the bottom wall 58 of the piston, said distance X being a minimum distance X that will be explained below.
  • the peripheral wall 54 of the lower piston could be provided with a plurality of spill holes 60 arranged from the top of the peripheral wall down to the bottom wall 58.
  • the peripheral wall 52 downwardly extends toward a lower rest face. At the centre of the under face of the bottom wall 58 downwardly extends a protrusion that, in use, contacts the upper face of the top of the stem of the control valve 22.
  • a disc spring assembly 64 comprising a lower disc 66, an adjusting shim 68 and an upper disc 70, the leaf-spring assembly 64 being sandwiched between the bottom wall 58 of the lower piston 52 and the under face of the upper piston 46.
  • the minimum distance X at which the spill hole 60 can be arranged is chosen to be above the under face of the upper piston so that, in operation, when the upper piston 46 is in place and the disc spring 64 is compressed, the spill hole 60 is closed by the upper piston 46.
  • the HLA 20 further comprises a cylindrical cage spring 72 externally surrounding the peripheral wall 54 of the lower piston 52 and axially compressed between a transversal face of the injector body 16, said face being known by the skilled person as the upper face of the valve body and, the under face of the protruding portion of the upper piston cap-head 50.
  • Cage springs are also known by persons skilled in the art of servo fuel injectors under the name of tubular springs or sleeve springs.
  • a typical cage spring has a tubular body extending along an axis, the cylindrical wall of the body being provided with plurality of elongated transverse apertures.
  • the cage spring 72 has very high compression stiffness, much higher than the stiffness of the disc-spring assembly 64 and, the cage-spring 72 permanently solicits upwardly the upper piston 46 toward the actuator 18.
  • the actuator 18 When the actuator 18 is energized, it elongates and downwardly solicits the upper piston 46. The downward displacement of the upper piston 46 compresses the cage-spring 72. The fuel captured below the upper piston 46 at the bottom of the lower piston 52 compresses and, consequently the disc spring assembly 64 also compresses to the point that the force generated by the actuator 18 is integrally transmitted to the lower piston 52 which then, opens the valve, and consequently enables fuel spray through the nozzle 14.
  • the upper piston 46 can be made hollow its cylindrical body 48 and its cap head 50 being distinct components are fixed to each other after being machined.
  • the assembly method 100 of the HLA 20 is now described in relation to figures 3, 4 and 5 .
  • Figure 3 illustrates a presentation step 102 of the assembly method where the cup-like shape lower piston 52 is filled with fuel F and the disc spring 64 is place against the bottom wall 58.
  • the upper piston 46 is presented above the opening of the opening of the lower piston.
  • Figure 4 illustrates an engagement step 104 of the assembly method 100 where the upper piston 46 is slidably engaged in the lower piston 52; the fuel is then evacuated through the spill hole 60.
  • the lower piston would be provided with a plurality of spill holes 60 arranged along the peripheral wall, said plurality of holes 60 enabling evacuation of the fuel F, the engagement of the upper piston 46 closing the holes one by one as the upper piston further moves toward its final position.
  • Figure 5 illustrates the final stage 106 of the assembly where the upper piston 46 is totally engaged in the lower piston 52, the disc spring 64 being compressed between the two pistons.
  • the spill hole 60 is closed by the upper piston 46 which defines the minimum distance X at which the spill hole 60 is placed. Indeed, the minimum distance X is small enough so that the spill hole 60 is not closed too soon during the engagement of the upper piston 46 and, said minimum distance X is important enough so that the spill hole 60 is indeed closed when the upper piston 46 is finally in place.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP16187250.2A 2015-09-08 2016-09-05 Rattrapeur de jeu hydraulique disposé dans un servo-injecteur Withdrawn EP3141738A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB1515892.6A GB201515892D0 (en) 2015-09-08 2015-09-08 Hydraulic lash adjuster arranged in a servo injector

Publications (1)

Publication Number Publication Date
EP3141738A1 true EP3141738A1 (fr) 2017-03-15

Family

ID=54345931

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16187250.2A Withdrawn EP3141738A1 (fr) 2015-09-08 2016-09-05 Rattrapeur de jeu hydraulique disposé dans un servo-injecteur

Country Status (2)

Country Link
EP (1) EP3141738A1 (fr)
GB (1) GB201515892D0 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1314826A (en) 1970-07-23 1973-04-26 Molins Ltd Cigarette making machines
US4858439A (en) * 1987-03-03 1989-08-22 Toyota Jidosha Kabushiki Kaisha Device for varying a stroke
WO1996037698A1 (fr) * 1995-05-24 1996-11-28 Siemens Aktiengesellschaft Soupape d'injection
US6260541B1 (en) * 2000-04-26 2001-07-17 Delphi Technologies, Inc. Hydraulic lash adjuster
DE10326046A1 (de) * 2003-06-10 2004-12-30 Robert Bosch Gmbh Einspritzdüse für Brennkraftmaschinen
WO2005003550A1 (fr) * 2003-07-01 2005-01-13 Ganser-Hydromag Ag Soupape d'injection de carburant pour moteurs a combustion interne
EP2295787A1 (fr) * 2009-07-29 2011-03-16 Delphi Technologies Holding S.à.r.l. Injecteur de carburant

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1314826A (en) 1970-07-23 1973-04-26 Molins Ltd Cigarette making machines
US4858439A (en) * 1987-03-03 1989-08-22 Toyota Jidosha Kabushiki Kaisha Device for varying a stroke
WO1996037698A1 (fr) * 1995-05-24 1996-11-28 Siemens Aktiengesellschaft Soupape d'injection
US6260541B1 (en) * 2000-04-26 2001-07-17 Delphi Technologies, Inc. Hydraulic lash adjuster
DE10326046A1 (de) * 2003-06-10 2004-12-30 Robert Bosch Gmbh Einspritzdüse für Brennkraftmaschinen
US20060032940A1 (en) * 2003-06-10 2006-02-16 Friedrich Boecking Injection nozzle for internal combustion engines
WO2005003550A1 (fr) * 2003-07-01 2005-01-13 Ganser-Hydromag Ag Soupape d'injection de carburant pour moteurs a combustion interne
EP2295787A1 (fr) * 2009-07-29 2011-03-16 Delphi Technologies Holding S.à.r.l. Injecteur de carburant

Also Published As

Publication number Publication date
GB201515892D0 (en) 2015-10-21

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