EP3507482A1 - Ensemble de bobine - Google Patents
Ensemble de bobineInfo
- Publication number
- EP3507482A1 EP3507482A1 EP17752157.2A EP17752157A EP3507482A1 EP 3507482 A1 EP3507482 A1 EP 3507482A1 EP 17752157 A EP17752157 A EP 17752157A EP 3507482 A1 EP3507482 A1 EP 3507482A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hole
- coil assembly
- degassing
- section
- axial
- 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.)
- Granted
Links
- 238000007872 degassing Methods 0.000 claims abstract description 40
- 239000000446 fuel Substances 0.000 claims abstract description 18
- 238000004804 winding Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 description 7
- 230000010355 oscillation Effects 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/002—Arrangement of leakage or drain conduits in or from injectors
-
- 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/007—Venting 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
- F02M63/0017—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
- F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion
-
- 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
- F02M2200/28—Details of throttles in fuel-injection apparatus
-
- 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
- F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping 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
- F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
-
- 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
- F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
Definitions
- the present invention relates to a fuel injector and has particularly, but not exclusively, application to fuel injectors for supplying fuel under pressure to a combustion chamber of an internal combustion engine.
- Fuel injection systems for modern internal combustion engines, particularly compression ignition engines, include a plurality of fuel injectors arranged to emit an atomized jet of high pressure fuel into a combustion chamber of the engine.
- a fuel injector known to be used in such a system includes an injection needle.
- the needle is slidable within the bore formed in a nozzle body and engageable with a seat to control the dispensing of fuel through one or more exit openings.
- an actuator When at the beginning of the injection, an actuator is electrically powered to achieve the opening, which causes the movement of a frame and a valve member, also called valve stem by professionals.
- the control rod is located in the low pressure chamber, the control rod then moves up against the action of a coil spring of the actuator.
- the length of the spring is reduced and an oscillation propagates spiral turn and then propagates on the control rod and the oscillation thus goes back and forth creating disturbances of the fuel flow.
- the propagation of the oscillation disturbs the displacement of the armature integral with the body of the control rod. Oscillations occur on the forces applied to close or open the control valve. This problem is explained by a disturbed displacement of the reinforcement caused by oscillations experienced by the spring. Moreover this problem will be solved by the present invention, which will be described later.
- the present invention aims to solve the problem of displacement of the armature caused by oscillations experienced by the spring.
- the invention consists of a coil assembly of an electromagnetic actuator adapted to be in a fuel injector.
- the coil assembly includes a magnetic core extending along a major axis, a coil wound around the core, the coil being overmolded forming a cylindrical overmold and extending axially from a first transverse face to at a second surface 48.
- the overmolded coil assembly further includes an axial blind hole extending inwardly of the coil assembly from the first surface at a distal end.
- the blind hole is adapted to accommodate at least one spring to solicit a magnetic armature.
- the coil assembly is further provided with a degassing hole traversing the core and overmolding from the blind axial hole to an axial outer cylindrical surface.
- the degassing hole is formed in the magnetic core.
- the degassing hole has a restriction arranged in a first proximal section of the blind axial hole.
- the first section has a first diameter D62, a first length L62 with the following characteristics:
- the degassing hole has a second section with a second diameter D64 at a proximal end of a return circuit and a second length L64:
- the degassing hole is disposed proximal to the distal end of the axial blind hole.
- the degassing hole is proximal to the first face of the coil.
- a diameter D50b of the blind hole is smaller than a mean diameter D50a of the axial blind hole in which communicates the first section of the calibrated degassing hole.
- the degassing hole makes an angle with the main axis between 80 degrees and 120 degrees. The angle can be 90 °.
- an actuator of the fuel injector comprises the coil assembly as previously described.
- a fuel injector comprises the actuator as described above.
- a method of process fabrication of a coil assembly as previously described comprises the following steps:
- the degassing hole can be achieved by the use of an insert during overmolding of the wire.
- Figure 1 is a partial section of an injector
- Figure 2 is an isometric view of a coil subassembly.
- Figure 3 is an isometric view of a coil assembly
- Figure 4 is a section of the degassing hole DESCRIPTION OF THE PREFERRED EMBODIMENTS
- the injector 10 extends along a longitudinal axis X and comprises from bottom to top, in the conventional and nonlimiting sense of the figures, a nozzle assembly 12 comprising a valve element 14 or commonly called a needle 14 arranged in a body of nozzle 16, a control rod 34 arranged in a valve body 20, an actuator 22 arranged in an actuator body 24.
- the needle 14 is arranged axially sliding in a longitudinal cylindrical bore 26 of the nozzle body between a closed position wherein the needle 14 is in contact with a nozzle body seat (not shown) and an open position where the needle 14 is spaced from the seat (not shown).
- the injector 10 is provided with a fuel circulation circuit which makes it possible to supply high pressure fuel via a high pressure circuit from an inlet orifice arranged in an upper part of the injector. 10 to the injection holes (not shown) arranged in a lower part of the injector 10.
- the electromagnetic actuator 22 comprises a set of fixed electrical coil 28, a movable magnetic armature 30 fixed and integral with a valve element 31 is commonly called control rod 34 moving towards the coil assembly 28 when it is electrically powered and an elastic device 32 permanently pushing the magnetic armature 30 to a position remote from the coil assembly 28.
- the coil assembly 28 comprises a cylindrical overmolding 42 and a coil subassembly 43 comprising two ends 36, a core 38 and a coil 40 wound around the core 38. Both ends 36 extend along the main axis X to an upper end of the subassembly 43.
- the coil 40 is overmolded forming the cylindrical overmolding 42.
- the coil 40 extends axially from a first transverse face 46 extending axially to a second surface 48.
- overmolded coil assembly 28 further includes an axial blind hole 50 extending inwardly of the coil assembly 28 from a first end 51 to a second end 52.
- the blind hole 50 is adapted to accommodate at least two springs 54, 56 for biasing the magnetic armature 30.
- the coil assembly 28 is further provided with a degassing hole 58 passing through the overmolding 42 from the blind axial hole 50 at an axial outer cylindrical surface 60.
- the degassing hole 58 has a restriction arranged in a first section 62 proximal of the blind axial hole 50.
- the restriction is a reduction in the diameter of the hole as placed in the passage of the fluid in movement it limits its flow or changes the pressure in the first portion 62 of the degassing hole.
- the restriction also produces the necessary pressure drops of the fluid under pressure in a leakage return circuit 61.
- the degassing hole 58 has a first section 62 having a first diameter D62, a first length L62 with the following characteristics:
- the degassing hole 58 has a second section 64 with a second diameter D64 between the first section 62 and the transverse outer surface 60 of the leakage return circuit 61 and a second length L64:
- the choice of the dimensions of the two sections 62, 64 allows a less turbulent flow towards the leakage return circuit 61.
- the degassing hole 58 is disposed proximal to the distal second end 52. In other alternatives not shown the degassing hole 58 may be proximal to the first end 51 of the blind hole.
- the degassing hole 58 makes an angle of 90 ° with the main axis X. In an alternative to the embodiment not shown, the degassing hole 58 can make an angle of between 80 degrees and 120 degrees with the main axis X .
- the blind hole 50 extends along the longitudinal axis X.
- the blind hole 50 has a first diameter D50a and a second diameter D50b.
- the first diameter D50a is the average value of the diameter of the hole 50.
- the second diameter D50b is smaller than the first average diameter D50a of the hole.
- the elastic device 32 comprises two helical springs 54, 56 separated by a separator member 66 or pin 66. In other alternatives the elastic device 66 may comprise a single spring 54, 56.
- the elastic device 32 is arranged in the axial blind hole 50. According to Figure 1, the first spring 54 is compressed between a first face 68 of the pin 66 and the second end 52 of the hole. The second spring 56 is compressed between the second face 69 of the pin and the electric armature 30.
- the method of manufacturing the coil assembly 28 comprises the following steps:
- the calibrated degassing hole 58 is thus formed in the magnetic part (38).
- the degassing hole 58 may be made by laser technology or by any other means.
- the shape of the degassing hole 58 may be round, square or conical or any other shape.
- the overpressure in the axial hole 50 is suppressed by the degassing hole 58 which is fluid communication with the axial blind hole 50 through the first section 62 of the degassing hole and the second section 64 arranged in the extension of the first section 62 and between the first section 62 and a low pressure zone which communicates with the leakage return circuit 61 .
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1658148A FR3055370B1 (fr) | 2016-09-01 | 2016-09-01 | Ensemble de bobine |
PCT/EP2017/071046 WO2018041656A1 (fr) | 2016-09-01 | 2017-08-21 | Ensemble de bobine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3507482A1 true EP3507482A1 (fr) | 2019-07-10 |
EP3507482B1 EP3507482B1 (fr) | 2020-07-22 |
Family
ID=57860951
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17752157.2A Active EP3507482B1 (fr) | 2016-09-01 | 2017-08-21 | Ensemble de bobine |
Country Status (6)
Country | Link |
---|---|
US (1) | US10995715B2 (fr) |
EP (1) | EP3507482B1 (fr) |
KR (1) | KR102337017B1 (fr) |
CN (1) | CN109790805B (fr) |
FR (1) | FR3055370B1 (fr) |
WO (1) | WO2018041656A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3106161B1 (fr) * | 2020-01-09 | 2021-12-03 | Delphi Tech Ip Ltd | Actionneur électromagnétique |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60119364A (ja) * | 1983-12-02 | 1985-06-26 | Hitachi Ltd | 電磁式燃料噴射弁 |
US5044562A (en) * | 1990-07-02 | 1991-09-03 | General Motors Corporation | Dual spray director using an "H" annulus |
US5295627A (en) * | 1993-08-19 | 1994-03-22 | General Motors Corporation | Fuel injector stroke calibration through dissolving shim |
JPH08158981A (ja) * | 1994-12-02 | 1996-06-18 | Nippondenso Co Ltd | 燃料噴射装置 |
DE19859537A1 (de) * | 1998-12-22 | 2000-07-06 | Bosch Gmbh Robert | Kraftstoffeinspritzventil |
JP3790711B2 (ja) | 2002-03-15 | 2006-06-28 | ボッシュ株式会社 | 燃料インジェクタ |
JP4030529B2 (ja) * | 2004-06-21 | 2008-01-09 | 株式会社ケーヒン | 燃料噴射弁 |
US7389952B2 (en) * | 2004-08-04 | 2008-06-24 | Continental Automotive Systems Us, Inc. | Deep pocket seat assembly in modular fuel injector with unitary filter and O-ring retainer assembly and methods |
US20060157595A1 (en) * | 2005-01-14 | 2006-07-20 | Peterson William A Jr | Fuel injector for high fuel flow rate applications |
JP2007040242A (ja) | 2005-08-04 | 2007-02-15 | Denso Corp | 電磁弁およびそれを用いた燃料噴射装置、および電磁弁の製造方法 |
JP4855946B2 (ja) * | 2006-06-08 | 2012-01-18 | 株式会社デンソー | 燃料噴射弁 |
JP2009103080A (ja) * | 2007-10-24 | 2009-05-14 | Denso Corp | 燃料噴射弁 |
DE102007050819A1 (de) * | 2007-10-24 | 2009-04-30 | Robert Bosch Gmbh | Elektromagnetisch betätigbares Ventil |
JP5079643B2 (ja) * | 2007-11-02 | 2012-11-21 | 株式会社デンソー | 燃料噴射弁及び燃料噴射装置 |
JP2009257511A (ja) | 2008-04-18 | 2009-11-05 | Denso Corp | 電磁アクチュエータ |
JP2013217330A (ja) | 2012-04-11 | 2013-10-24 | Denso Corp | 燃料噴射装置 |
CN104350270B (zh) * | 2012-06-08 | 2017-03-15 | 本田技研工业株式会社 | 燃料喷射装置 |
US9404443B2 (en) * | 2013-03-15 | 2016-08-02 | Mcalister Technologies, Llc | Methods for joule-thompson cooling and heating of combustion chamber events and associated systems and apparatus |
GB201400650D0 (en) * | 2014-01-15 | 2014-03-05 | Delphi Tech Holding Sarl | Bobbin with venting conduit |
FR3024499B1 (fr) * | 2014-07-31 | 2019-05-03 | Delphi Technologies Ip Limited | Actionneur a double ressort |
-
2016
- 2016-09-01 FR FR1658148A patent/FR3055370B1/fr not_active Expired - Fee Related
-
2017
- 2017-08-21 KR KR1020197009059A patent/KR102337017B1/ko active IP Right Grant
- 2017-08-21 EP EP17752157.2A patent/EP3507482B1/fr active Active
- 2017-08-21 WO PCT/EP2017/071046 patent/WO2018041656A1/fr unknown
- 2017-08-21 CN CN201780053229.3A patent/CN109790805B/zh active Active
- 2017-08-21 US US16/329,889 patent/US10995715B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP3507482B1 (fr) | 2020-07-22 |
WO2018041656A1 (fr) | 2018-03-08 |
FR3055370A1 (fr) | 2018-03-02 |
CN109790805A (zh) | 2019-05-21 |
KR102337017B1 (ko) | 2021-12-09 |
US10995715B2 (en) | 2021-05-04 |
US20190242344A1 (en) | 2019-08-08 |
KR20190041522A (ko) | 2019-04-22 |
CN109790805B (zh) | 2021-03-16 |
FR3055370B1 (fr) | 2020-05-01 |
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