US20120067981A1 - Precision Ground Armature Assembly For Solenoid Actuator And Fuel Injector Using Same - Google Patents
Precision Ground Armature Assembly For Solenoid Actuator And Fuel Injector Using Same Download PDFInfo
- Publication number
- US20120067981A1 US20120067981A1 US13/306,264 US201113306264A US2012067981A1 US 20120067981 A1 US20120067981 A1 US 20120067981A1 US 201113306264 A US201113306264 A US 201113306264A US 2012067981 A1 US2012067981 A1 US 2012067981A1
- Authority
- US
- United States
- Prior art keywords
- piece
- guide
- assembly
- fuel injector
- armature
- 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.)
- Abandoned
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Classifications
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- 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
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- 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
- F02M63/0024—Valves characterised by the valve actuating means electrical, e.g. using solenoid in combination with permanent magnet
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/16—Rectilinearly-movable armatures
- H01F7/1607—Armatures entering the winding
- H01F7/1623—Armatures having T-form
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
- H02K33/02—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs
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- 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
- F02M2200/8069—Fuel injection apparatus manufacture, repair or assembly involving removal of material from the fuel apparatus, e.g. by punching, hydro-erosion or mechanical operation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
- F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
- F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
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- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
- F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49009—Dynamoelectric machine
Definitions
- the present disclosure relates to the field of solenoid actuators, and more particularly, to the field of solenoid air gap features in electronically controlled fuel injectors.
- Typical solenoid actuated fuel injectors include an armature connected to a valve member that controls the flow of fuel and/or pressure through the fuel injector.
- the armature By having the armature connected to the valve member, the movement of the armature within the stator assembly may be compromised. By moving the armature with the valve member coupled thereto, the armature might travel at reduced speeds due to the increased mass, and any attempts to improve parallelism with the stator assembly were also hindered due to the tolerance stack ups that invariably increase during production with more connected parts.
- some armature assemblies included a hard guide piece that was part of, or drove a fuel injection valve member, and a soft armature piece that served to enhance the magnetic forces acting on the armature. In order to improve parallelism and maintain a predetermined initial and final air gap, manufacturers used various category parts that took into account the inaccuracies that existed in the dimensions of the solenoid actuator assembly despite establishing very tight tolerances during mass production.
- the armature moves towards the stator assembly, moving the valve member, and thereby controlling the fluid flow and/or pressure in the fuel injector.
- a mechanical spring or other bias forces the armature away from the stator assembly, causing the valve member to return to its original position and thereby controlling the fluid flow and/or pressure in the fuel injector again.
- the time taken for the solenoid actuator, and hence the control valve of a fuel injector, to move from a first position to a second position and back again is a function of the highest possible forces acting on the armature over the shortest possible travel distance. It is desired by those in the art to reduce the time taken for the armature to travel from the initial air gap position to the final air gap position and back to the initial air gap position.
- the magnetic forces acting on the armature are functions of the electromagnetic properties of the armature, the initial and final air gap between the armature and the stator assembly and the parallel orientation of the armature with reference to the stator assembly, including others. It is well known in the art that a magnetic field in a solenoid has the greatest force when the armature is parallel to the stator assembly and the air gap between them is as small as possible. Having a larger initial air gap will translate to the armature having a lower initial attraction force and maybe a larger travel distance, hence increasing the time taken to travel from the initial air gap position to the final air gap position.
- the present disclosure is directed to one or more of the problems set forth above.
- a method for assembling a solenoid actuator includes the steps of attaching a soft flux piece to a hard guide piece.
- a stop surface is ground on the guide piece relative to the top surface on the flux piece so that a final air gap is at a predetermined distance when the stop surface is in contact with a stator assembly.
- a solenoid actuator assembly in another aspect, includes an armature assembly and a stator assembly.
- the armature assembly comprises a soft flux piece attached to a hard guide piece, which has a stop surface ground on it.
- the stator assembly defines a guide bore through which the guide piece is slidably received. The guide piece moves between a first position where the stop surface on the guide piece is in contact with the stator assembly, and the second position where the stop surface is out of contact with the stator assembly. Also, a final air gap is defined between a bottom surface on the stator assembly and a surface on the flux piece when the guide piece is in the first position.
- a fuel injector assembly comprises an armature assembly.
- the armature assembly is made of a soft flux piece attached to a hard guide piece, which includes a stop surface.
- the guide piece moves between a first position where the stop surface on the guide piece is in contact with the stator assembly, but the guide piece is out of contact with a valve member.
- the stop surface is out of contact with the stator assembly, but the guide piece is in contact with the valve member.
- FIG. 1 is a sectioned front view of a fuel injector according to the present disclosure
- FIG. 2 is an enlarged sectioned front view of the control valve portion of the fuel injector shown in FIG. 1 ;
- FIG. 3 is an enlarged sectioned front view of the fuel injector shown in FIG. 1 ;
- FIG. 4 is a sectioned front view of an enlarged armature assembly of the fuel injector shown in FIG. 1 .
- a fuel injector 10 includes an electronically controlled valve assembly 60 and a valve nozzle 92 that is opened and closed by a valve needle 90 .
- the electronically controlled valve assembly 60 includes a solenoid actuator assembly 20 , a valve member 61 , a first spring 56 having a first pre-load and a second spring 58 having a second pre-load.
- the solenoid actuator assembly 20 includes a stator assembly 21 and an armature assembly 40 .
- the stator assembly 21 and armature assembly 40 are both made from various assembled parts.
- Valve needle 90 includes a closing hydraulic surface 66 exposed to fluid pressure in a needle control chamber 67 . Energizing and de-energizing solenoid actuator assembly 20 moves valve member 61 to change pressure in needle control chamber 67 (via fluid connections not shown) to allow valve needle 90 to open and close valve nozzle 92 in a conventional manner.
- the stator assembly 21 includes an outer pole piece 25 attached to an inner pole piece 24 , such as via welding them together at the weld joint 30 .
- other attachment mechanisms and locations may be used to attach the inner pole piece 24 to the outer pole piece 25 .
- the pole pieces 24 and 25 may have co-planar bottom surfaces. As the pole pieces 24 and 25 are attached to each other, in this embodiment they share the same bottom surface, which is referred to as the planar bottom surface 26 .
- a coil 29 is carried on a bobbin 28 inside a cavity formed within the pole pieces 24 and 25 . The remainder of the space between the pole pieces may be filled with plastic filler 27 .
- Inner walls of the inner pole piece 24 form a pole bore 23 through which a guide sleeve 31 is attached.
- the guide sleeve 31 may be press fitted through the pole bore 23 so that it fits snugly along the inner walls of the inner pole piece 24 .
- Other embodiments may contemplate other ways of attaching the guide sleeve 31 to the inner walls of the inner pole piece 24 , such as a weak press fit accompanied by a weld.
- the guide sleeve 31 has an inner diameter surface 32 , which defines a guide bore 33 .
- the guide bore 33 has a longitudinal axis 35 that is perpendicular to the planar bottom surface on the pole piece 26 .
- the guide sleeve 31 has a stop surface 77 , which is the bottom surface on the guide sleeve 31 and in one embodiment, it may be flush with, or be considered part of the bottom surface 26 .
- the bottom surface 26 on the entire stator assembly 21 is machined to form a planar bottom surface on the entire stator assembly 21 .
- guide sleeve 31 and pole pieces 24 and 25 may be made from the same or different materials. For instance, pole pieces 24 and 25 may be chosen for their magnetic flux channeling capacities, but the guide sleeve material may be chosen more for wear characteristics in guide bore 33 and stop surface 77 .
- the armature assembly 40 includes a guide piece 43 made of a hard material which exhibits impact resistant properties and a flux piece 45 made of a soft material which exhibits high magnetic properties.
- the flux piece 45 may be attached to the guide piece 43 at a weld joint 53 .
- the pieces may be attached by welding the pieces together, press fitting them or using a combination of a light press fit and a weld, among other attachment strategies.
- the guide piece 43 includes at least one guide surface 36 and 37 , an enlarged diameter portion 44 and a stop surface 75 located on the portion 44 .
- the guide piece 43 has a first guide surface 36 , a second section or guide surface 37 and a reduced diameter section 38 .
- the armature assembly 40 By reducing the diameter on the guide piece 43 in section 38 , the armature assembly 40 has a lower mass and therefore, requires a smaller force to displace the armature assembly 40 .
- the outer surface on the guide piece including the first guide surface 36 and second guide surface 37 , may be ground after attaching the guide piece 43 to the flux piece 45 in such a manner that when the guide piece 43 is received in the guide bore 33 , the guide clearance along the inner diameter surface 32 on the guide sleeve 31 , and hence the guide sleeve 31 itself, is so small resulting in a much improved parallelism between the top surface 50 on the flux piece 45 and the planar bottom surface 26 .
- armature assembly 40 may be guided through the guide bore 33 via an interaction between the guide piece 43 and the guide sleeve 31 .
- the stop surface 75 on the guide piece 43 will not be planarly flush with a top surface 50 on the flux piece 45 in an exemplary embodiment.
- the distance between the stop surface 75 on the guide piece 43 and the top surface 50 on the flux piece 45 along the axis 35 of the guide bore 33 is a predetermined final air gap 70 .
- a final air gap of about 0.05 mm can be achieved on a consistent basis while maintaining efficient operating costs.
- the term “about” means that when the number is rounded to a like number of significant digits, the numbers are equal. Thus, both 0.045 and 0.054 are about 0.05.
- One other aspect of the disclosure teaches the step of grinding the stop surface 75 on the guide piece 43 to be performed after the flux piece 45 is attached to the guide piece 43 .
- Conventional wisdom in the art focuses on producing pieces with ever increasing tightened tolerances so that after attachment, the tolerance stack-ups would not amount to substantial variations.
- This disclosure resolves the problems faced by others in the art by allowing parts to be manufactured under less stringent tolerances, attaching the pieces together and then grinding the surfaces on the pieces in a single chucking. This produces an armature assembly 40 that compensates for the tolerance variations in the geometric dimensions of each individual piece while producing a much more accurate orientation between the guide piece 43 and the guide sleeve 31 .
- the grinding step may be performed by grinding a stop surface 75 on the shoulder of the guide piece 43 , such that the stop surface 75 is parallel to the flux piece 45 of the armature assembly 40 and is at a distance equivalent to the final air gap 70 .
- the grinding step can include grinding the guide surfaces 36 and 37 of the guide piece 43 and grinding the stop surface 75 on the guide piece 43 in a single chucking. This will allow a more improved orientation of the guide piece 43 into the guide bore 33 and also allow the guide piece 43 to have an orientation that is perpendicular to the flux piece 45 , improving the parallelism between the flux piece 45 and the bottom planar surface 26 .
- the armature assembly 20 is shown in a first position.
- the coil 29 is energized causing the solenoid actuator 20 to apply a pulling force on the armature assembly 40 bringing stop surface 75 of the armature assembly 40 in contact with the stop surface 77 , which is part of the planar bottom surface 26 of the stator assembly 21 .
- the armature assembly 40 may have a larger travel distance than the valve member 61 in order to be decoupled from the valve member 61 . In this position, armature assembly 40 is out of contact with the valve member 61 , resulting in a gap 71 between the armature assembly 40 and valve member 61 .
- the stop surface 75 on the guide piece 43 comes into contact with the stop surface 77 on the guide sleeve 31 .
- a final air gap 70 is formed between the planar bottom surface 26 and the top planar surface 50 on the flux piece 45 .
- the first spring 56 remains in contact with the guide piece 43 and exerts a first pre-load bias force on the guide piece 43 in a direction away from stator assembly 21 .
- the second spring 58 exerts a second pre-load bias on the valve member 61 forcing the valve member 61 to move from the lower valve seat 64 toward upper valve seat 65 in a conventional manner.
- the armature assembly 40 moves toward a second position when the coil 29 is de-energized.
- the stop surface 75 on the guide piece 43 moves out of contact with the stop surface 77 on the guide sleeve 31 .
- the guide piece 43 is in contact with valve member 61 and valve member 61 moves into contact with lower seat 64 under the action of first spring 56 .
- the first spring 56 now has a greater pre-load than the pre-load of the second spring 58 so that valve member 61 will move to its lower seat when coil 29 is de-energized.
- the distance between the planar bottom surface 26 and the top planar surface 50 on the flux piece 45 along the longitudinal axis 35 of the guide bore 33 is equivalent to an initial air gap.
- valve member 61 By decoupling the action of solenoid assembly 20 from valve member 61 slight misalignments between an axis of valve member 61 and guide axis 35 can be tolerated with altering performance.
- the speed of the valve member 61 moving between seats 64 and 65 are determined primarily by respective pre-loads on springs 56 and 58 , which may be set precisely with respective spacers 80 and 81 .
- Seats 64 and 65 may be considered as first and second stops for valve member 61 .
- the decoupled solenoid assembly 20 can now function with greater precision and may allow for a smaller initial and final air gap 69 and 70 .
- the armature assembly 40 will function independently of the valve member 61 as long as the armature assembly 40 travels faster than the valve member 61 . This also desensitizes the valve member 61 from any misalignments that may occur due to construction tolerance variances and any lateral shifting in the armature assembly 40 in order to improve parallelism between the armature assembly 40 and the stator assembly 21 .
- the present disclosure finds potential application in any solenoid assembly in any machine. Although this particular embodiment of the disclosure is directed towards an electronically controlled valve assembly for use in a common rail fuel injector, the disclosure is not limited to fuel injectors and could find applicability in a much broader array of industries that use solenoid actuators.
- the present disclosure finds particular application to fuel injectors used in compression ignition engines. Other fuel injector applications include, but are not limited to, cam and/or hydraulically actuated fuel injectors.
- Electronically controlled valve assemblies may be used to control the flow of fluids and/or pressure through a fuel injector. In the present disclosure, the valve assembly performs repeated cycles of movement at an extremely high rate over many millions of cycles.
- the solenoid actuator 20 has two states. An off or de-energized state, which corresponds to the second position of the armature assembly 40 and an on or energized state, which corresponds to the first position of the armature assembly 40 . In the off state, the solenoid actuator 20 is switched off and no current is passing through the coil 29 of the solenoid actuator 20 . As there is no current passing through the coil 29 , there are no magnetic forces produced within the stator assembly 21 . The first spring 56 exerts a force on the armature assembly 40 and the valve member 61 causing them to be pushed away from the stator assembly 21 to stop when valve member 61 contacts lower seat 64 .
- the second spring 58 exerts an opposite force on the valve member 61 and the armature assembly 40 towards the stator assembly 21 but the force is not great enough to overcome the force exerted by the first spring 56 . Therefore, the net resulting force from the two springs 56 and 58 causes the valve member 61 to assume a second stop position in contact with the valve seat 64 that corresponds to either an open or a closed position which in turn controls the flow of fluid and/or pressure through the fuel injector 10 depending on the configuration of the valve assembly 60 .
- the armature assembly 40 is positioned away from the planar bottom surface 26 and the distance from the planar surface 50 of the flux piece 45 to the planar bottom surface 26 of the stator assembly 21 along the longitudinal axis 35 of the guide bore 33 is the initial air gap.
- the armature assembly 40 moves from its second position to its first position. Switching the solenoid actuator 20 on energizes the coil 29 .
- the coil 29 produces a magnetic field around the stator assembly 21 and creates a magnetic force in the surrounding region. The force of the magnetic field is strong enough to pull the armature assembly 40 towards the stator assembly 21 . This force is greater than the force of the spring 56 hence causing the armature assembly 40 to move towards the stator assembly 21 .
- the armature assembly 40 may be pulled faster than the valve member 61 is pushed upward by the second spring 58 .
- the valve member 61 moves from the second stop position to a first stop position that corresponds to either an open or a closed position which in turn controls the flow of fluid and/or pressure through the fuel injector 10 depending on the fluid configuration of the valve assembly 60 .
- the guide piece 43 moves up the guide bore 33 of the stator assembly 21 maintaining a guide clearance with the guide sleeve 31 .
- the guide piece 43 stops moving when the stop surface 75 on the guide piece 43 comes in contact with the stop surface 77 on the guide sleeve 31 .
- a top surface 49 on the guide piece 43 remains in contact with the first spring 56 .
- the distance between the planar bottom surface 26 of stator assembly 21 and the top surface 50 on the flux piece 45 is at its smallest distance, corresponding to the final air gap 70 , and may be equal to the distance between the stop surface 75 on the guide piece 43 and the top surface 50 on the flux piece 45 .
- the first spring 56 exerts a bias force on the guide piece 43 .
- the magnetic force is exerted on the armature assembly 40 and the armature assembly 40 remains in the first position.
- fuel injection events may be initiated and ended by energizing and de-energizing solenoid actuator 20 in a known manner.
- the solenoid actuator 20 is turned off again and the coil 29 is de-energized.
- the coil 29 no longer provides a magnetic force therefore allowing the net resulting force of the springs 56 and 58 to force the armature assembly 40 to move from the first position to the second position again.
- the first spring 56 exerts a force on the top surface 49 on the guide piece 43 .
- the stop surface 75 on the guide piece 43 loses contact with the stop surface 77 on the guide sleeve 31 , while the bottom impact surface 48 on the guide piece 43 comes back in contact with the valve member 61 pushing the valve member 61 back to its original position, and thereby allowing the valve member 61 to control the fluid flow and/or pressure through the fuel injector 10 again.
- the armature assembly 40 finally stops when it reaches the second position, wherein the distance between the flux piece 45 and the planar bottom surface 26 is equal to the initial air gap 69 .
- the armature assembly 40 continues to move from the second position to the first position and back as long as the solenoid actuator 20 is turned on and turned off.
- This continuous process demonstrates why it may be important for the impact surfaces of the guide piece 43 to be made of a hard, impact resistant material.
- the flux piece 45 should be made of a soft material possessing superior magnetic properties in order to move between the first and second position with less force than might otherwise be needed. With the structure shown, the travel distance of valve member 61 will inherently be smaller than the travel distance of armature assembly 40 .
- This disclosure provides numerous ways to reduce the initial and final air gap of solenoid actuators and improve parallelism between the top surface 50 on the flux piece 45 and the bottom surface 26 on the stator assembly 21 .
- Grinding the stop surface 75 on the guide piece 43 , after attaching the armature assembly 40 may permit smaller geometric variations than in the past. Grinding the surface 75 after the attaching step eliminates the need to develop parts with ever increasingly tightened geometric tolerances because the grinding step after attachment allows parts with larger geometric variations to be ground to the same predetermined dimensions.
- the armature assembly 40 is ground (guide surfaces 36 , 37 and stop surface 75 ) in a single chucking, the guide piece 43 and the flux piece 45 are oriented more accurately than if ground in more than a single chucking. This produces an improved, more geometrically aligned stop surface 75 on the guide piece 43 and better parallelism between the top surface 50 on the flux piece 45 and the planar bottom surface 26 of the stator assembly 21 .
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Fluid Mechanics (AREA)
- Magnetically Actuated Valves (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
A solenoid actuator includes a hard guide piece and a soft flux piece. The hard guide piece has a stop surface ground to create a final air gap distance between the soft flux piece and a stator assembly when the stop surface on the guide piece is in contact with the stator assembly. The final air gap is set by grinding the stop surface on the guide piece so that the distance between the stop surface on the guide piece and a top surface on the soft flux piece along an axis of the guide bore is equal to the final air gap. The step of grinding the armature assembly may be done after attaching the guide piece and the flux piece together. In an exemplary embodiment, the step of grinding the stop surface and associated guide surface(s) are performed in a single chucking.
Description
- This application is a divisional of co-pending patent application Ser. No. 12/217,622 filed Jul. 8, 2008 with the same title.
- The present disclosure relates to the field of solenoid actuators, and more particularly, to the field of solenoid air gap features in electronically controlled fuel injectors.
- People skilled in the art recognize the goal to mass produce a solenoid actuator having smaller initial and final air gaps with improved parallelism between a stator assembly and an armature in a cost efficient manner. Even though it may be possible to produce a solenoid actuator assembly having a very small air gap and where the armature is parallel to the stator assembly, those in the art recognize there are significant costs involved in mass producing such assemblies.
- Typical solenoid actuated fuel injectors include an armature connected to a valve member that controls the flow of fuel and/or pressure through the fuel injector. By having the armature connected to the valve member, the movement of the armature within the stator assembly may be compromised. By moving the armature with the valve member coupled thereto, the armature might travel at reduced speeds due to the increased mass, and any attempts to improve parallelism with the stator assembly were also hindered due to the tolerance stack ups that invariably increase during production with more connected parts. Moreover, in the past, some armature assemblies included a hard guide piece that was part of, or drove a fuel injection valve member, and a soft armature piece that served to enhance the magnetic forces acting on the armature. In order to improve parallelism and maintain a predetermined initial and final air gap, manufacturers used various category parts that took into account the inaccuracies that existed in the dimensions of the solenoid actuator assembly despite establishing very tight tolerances during mass production.
- When the coil of the solenoid is energized, the armature moves towards the stator assembly, moving the valve member, and thereby controlling the fluid flow and/or pressure in the fuel injector. When the coil ceases to be energized, a mechanical spring or other bias forces the armature away from the stator assembly, causing the valve member to return to its original position and thereby controlling the fluid flow and/or pressure in the fuel injector again. It is known in the art that the time taken for the solenoid actuator, and hence the control valve of a fuel injector, to move from a first position to a second position and back again is a function of the highest possible forces acting on the armature over the shortest possible travel distance. It is desired by those in the art to reduce the time taken for the armature to travel from the initial air gap position to the final air gap position and back to the initial air gap position.
- The magnetic forces acting on the armature are functions of the electromagnetic properties of the armature, the initial and final air gap between the armature and the stator assembly and the parallel orientation of the armature with reference to the stator assembly, including others. It is well known in the art that a magnetic field in a solenoid has the greatest force when the armature is parallel to the stator assembly and the air gap between them is as small as possible. Having a larger initial air gap will translate to the armature having a lower initial attraction force and maybe a larger travel distance, hence increasing the time taken to travel from the initial air gap position to the final air gap position. Having a smaller final air gap will allow for a smaller initial air gap and also allow a stronger magnetic force to act on the armature, hence increasing the speed at which the armature travels from the final air gap position to the initial air gap position and back. A lack of parallelism can create side forces leading to imbalance and increased wear at guide interfaces.
- There has been an ongoing effort to improve parallelism in prior references, while striving to achieve the smallest final air gap. One prior art reference, U.S. Patent Application US2006/0138374 A1 teaches the use of an adjustable spacer coupled between the armature housing and the stator. The spacer is adjusted depending on the tolerance variation of the assembled parts. U.S. Pat. No. 6,550,699 teaches the use of plating a hard film layer on the armature as a spacer. The prior art, although geared towards achieving some of the goals this disclosure aims to achieve, have been met with limited success.
- The present disclosure is directed to one or more of the problems set forth above.
- In one aspect, a method for assembling a solenoid actuator includes the steps of attaching a soft flux piece to a hard guide piece. A stop surface is ground on the guide piece relative to the top surface on the flux piece so that a final air gap is at a predetermined distance when the stop surface is in contact with a stator assembly.
- In another aspect, a solenoid actuator assembly includes an armature assembly and a stator assembly. The armature assembly comprises a soft flux piece attached to a hard guide piece, which has a stop surface ground on it. The stator assembly defines a guide bore through which the guide piece is slidably received. The guide piece moves between a first position where the stop surface on the guide piece is in contact with the stator assembly, and the second position where the stop surface is out of contact with the stator assembly. Also, a final air gap is defined between a bottom surface on the stator assembly and a surface on the flux piece when the guide piece is in the first position.
- In yet another aspect, a fuel injector assembly comprises an armature assembly. The armature assembly is made of a soft flux piece attached to a hard guide piece, which includes a stop surface. The guide piece moves between a first position where the stop surface on the guide piece is in contact with the stator assembly, but the guide piece is out of contact with a valve member. When moved to a second position, the stop surface is out of contact with the stator assembly, but the guide piece is in contact with the valve member.
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FIG. 1 is a sectioned front view of a fuel injector according to the present disclosure; -
FIG. 2 is an enlarged sectioned front view of the control valve portion of the fuel injector shown inFIG. 1 ; -
FIG. 3 is an enlarged sectioned front view of the fuel injector shown inFIG. 1 ; and -
FIG. 4 is a sectioned front view of an enlarged armature assembly of the fuel injector shown inFIG. 1 . - Referring to
FIG. 1 , afuel injector 10 includes an electronically controlledvalve assembly 60 and avalve nozzle 92 that is opened and closed by avalve needle 90. The electronically controlledvalve assembly 60 includes asolenoid actuator assembly 20, avalve member 61, afirst spring 56 having a first pre-load and asecond spring 58 having a second pre-load. Thesolenoid actuator assembly 20 includes astator assembly 21 and anarmature assembly 40. Thestator assembly 21 andarmature assembly 40 are both made from various assembled parts. Valveneedle 90 includes a closinghydraulic surface 66 exposed to fluid pressure in aneedle control chamber 67. Energizing and de-energizingsolenoid actuator assembly 20 movesvalve member 61 to change pressure in needle control chamber 67 (via fluid connections not shown) to allowvalve needle 90 to open andclose valve nozzle 92 in a conventional manner. - Referring now to
FIGS. 2 and 3 , thestator assembly 21 includes anouter pole piece 25 attached to aninner pole piece 24, such as via welding them together at theweld joint 30. In other embodiments, other attachment mechanisms and locations may be used to attach theinner pole piece 24 to theouter pole piece 25. Thepole pieces pole pieces planar bottom surface 26. In one embodiment, acoil 29 is carried on abobbin 28 inside a cavity formed within thepole pieces plastic filler 27. Inner walls of theinner pole piece 24 form apole bore 23 through which aguide sleeve 31 is attached. In one embodiment, theguide sleeve 31 may be press fitted through thepole bore 23 so that it fits snugly along the inner walls of theinner pole piece 24. Other embodiments may contemplate other ways of attaching theguide sleeve 31 to the inner walls of theinner pole piece 24, such as a weak press fit accompanied by a weld. Theguide sleeve 31 has aninner diameter surface 32, which defines a guide bore 33. The guide bore 33 has alongitudinal axis 35 that is perpendicular to the planar bottom surface on thepole piece 26. Theguide sleeve 31 has astop surface 77, which is the bottom surface on theguide sleeve 31 and in one embodiment, it may be flush with, or be considered part of thebottom surface 26. In one embodiment of the disclosure, thebottom surface 26 on theentire stator assembly 21 is machined to form a planar bottom surface on theentire stator assembly 21. Those skilled in the art will recognize thatguide sleeve 31 andpole pieces pole pieces surface 77. - Referring now to
FIG. 4 , thearmature assembly 40 includes aguide piece 43 made of a hard material which exhibits impact resistant properties and aflux piece 45 made of a soft material which exhibits high magnetic properties. Theflux piece 45 may be attached to theguide piece 43 at a weld joint 53. In many embodiments, the pieces may be attached by welding the pieces together, press fitting them or using a combination of a light press fit and a weld, among other attachment strategies. Theguide piece 43 includes at least oneguide surface enlarged diameter portion 44 and astop surface 75 located on theportion 44. In the embodiment shown inFIG. 4 , theguide piece 43 has afirst guide surface 36, a second section or guidesurface 37 and a reduceddiameter section 38. By reducing the diameter on theguide piece 43 insection 38, thearmature assembly 40 has a lower mass and therefore, requires a smaller force to displace thearmature assembly 40. In one embodiment, the outer surface on the guide piece, including thefirst guide surface 36 andsecond guide surface 37, may be ground after attaching theguide piece 43 to theflux piece 45 in such a manner that when theguide piece 43 is received in the guide bore 33, the guide clearance along theinner diameter surface 32 on theguide sleeve 31, and hence theguide sleeve 31 itself, is so small resulting in a much improved parallelism between the top surface 50 on theflux piece 45 and theplanar bottom surface 26. Thus,armature assembly 40 may be guided through the guide bore 33 via an interaction between theguide piece 43 and theguide sleeve 31. Furthermore, thestop surface 75 on theguide piece 43 will not be planarly flush with a top surface 50 on theflux piece 45 in an exemplary embodiment. The distance between thestop surface 75 on theguide piece 43 and the top surface 50 on theflux piece 45 along theaxis 35 of the guide bore 33 is a predeterminedfinal air gap 70. In one embodiment of the disclosure, a final air gap of about 0.05 mm can be achieved on a consistent basis while maintaining efficient operating costs. The term “about” means that when the number is rounded to a like number of significant digits, the numbers are equal. Thus, both 0.045 and 0.054 are about 0.05. - One other aspect of the disclosure teaches the step of grinding the
stop surface 75 on theguide piece 43 to be performed after theflux piece 45 is attached to theguide piece 43. Conventional wisdom in the art focuses on producing pieces with ever increasing tightened tolerances so that after attachment, the tolerance stack-ups would not amount to substantial variations. This disclosure resolves the problems faced by others in the art by allowing parts to be manufactured under less stringent tolerances, attaching the pieces together and then grinding the surfaces on the pieces in a single chucking. This produces anarmature assembly 40 that compensates for the tolerance variations in the geometric dimensions of each individual piece while producing a much more accurate orientation between theguide piece 43 and theguide sleeve 31. The grinding step may be performed by grinding astop surface 75 on the shoulder of theguide piece 43, such that thestop surface 75 is parallel to theflux piece 45 of thearmature assembly 40 and is at a distance equivalent to thefinal air gap 70. Also, the grinding step can include grinding the guide surfaces 36 and 37 of theguide piece 43 and grinding thestop surface 75 on theguide piece 43 in a single chucking. This will allow a more improved orientation of theguide piece 43 into the guide bore 33 and also allow theguide piece 43 to have an orientation that is perpendicular to theflux piece 45, improving the parallelism between theflux piece 45 and the bottomplanar surface 26. - In
FIGS. 1 , 2 and 3, thearmature assembly 20 is shown in a first position. In the first position, thecoil 29 is energized causing thesolenoid actuator 20 to apply a pulling force on thearmature assembly 40 bringingstop surface 75 of thearmature assembly 40 in contact with thestop surface 77, which is part of theplanar bottom surface 26 of thestator assembly 21. Thearmature assembly 40 may have a larger travel distance than thevalve member 61 in order to be decoupled from thevalve member 61. In this position,armature assembly 40 is out of contact with thevalve member 61, resulting in agap 71 between thearmature assembly 40 andvalve member 61. Thestop surface 75 on theguide piece 43, however, comes into contact with thestop surface 77 on theguide sleeve 31. Afinal air gap 70 is formed between theplanar bottom surface 26 and the top planar surface 50 on theflux piece 45. Furthermore, thefirst spring 56 remains in contact with theguide piece 43 and exerts a first pre-load bias force on theguide piece 43 in a direction away fromstator assembly 21. Thesecond spring 58 exerts a second pre-load bias on thevalve member 61 forcing thevalve member 61 to move from thelower valve seat 64 towardupper valve seat 65 in a conventional manner. - The
armature assembly 40 moves toward a second position when thecoil 29 is de-energized. Thestop surface 75 on theguide piece 43 moves out of contact with thestop surface 77 on theguide sleeve 31. Theguide piece 43, however, is in contact withvalve member 61 andvalve member 61 moves into contact withlower seat 64 under the action offirst spring 56. Furthermore, thefirst spring 56 now has a greater pre-load than the pre-load of thesecond spring 58 so thatvalve member 61 will move to its lower seat whencoil 29 is de-energized. The distance between theplanar bottom surface 26 and the top planar surface 50 on theflux piece 45 along thelongitudinal axis 35 of the guide bore 33 is equivalent to an initial air gap. - By decoupling the action of
solenoid assembly 20 fromvalve member 61 slight misalignments between an axis ofvalve member 61 and guideaxis 35 can be tolerated with altering performance. In addition, the speed of thevalve member 61 moving betweenseats springs respective spacers Seats valve member 61. The decoupledsolenoid assembly 20 can now function with greater precision and may allow for a smaller initial andfinal air gap 69 and 70. Furthermore, by decoupling thearmature assembly 40 and thevalve member 61, thearmature assembly 40 will function independently of thevalve member 61 as long as thearmature assembly 40 travels faster than thevalve member 61. This also desensitizes thevalve member 61 from any misalignments that may occur due to construction tolerance variances and any lateral shifting in thearmature assembly 40 in order to improve parallelism between thearmature assembly 40 and thestator assembly 21. - The present disclosure finds potential application in any solenoid assembly in any machine. Although this particular embodiment of the disclosure is directed towards an electronically controlled valve assembly for use in a common rail fuel injector, the disclosure is not limited to fuel injectors and could find applicability in a much broader array of industries that use solenoid actuators. The present disclosure finds particular application to fuel injectors used in compression ignition engines. Other fuel injector applications include, but are not limited to, cam and/or hydraulically actuated fuel injectors. Electronically controlled valve assemblies may be used to control the flow of fluids and/or pressure through a fuel injector. In the present disclosure, the valve assembly performs repeated cycles of movement at an extremely high rate over many millions of cycles.
- The
solenoid actuator 20 has two states. An off or de-energized state, which corresponds to the second position of thearmature assembly 40 and an on or energized state, which corresponds to the first position of thearmature assembly 40. In the off state, thesolenoid actuator 20 is switched off and no current is passing through thecoil 29 of thesolenoid actuator 20. As there is no current passing through thecoil 29, there are no magnetic forces produced within thestator assembly 21. Thefirst spring 56 exerts a force on thearmature assembly 40 and thevalve member 61 causing them to be pushed away from thestator assembly 21 to stop whenvalve member 61 contactslower seat 64. Thesecond spring 58 exerts an opposite force on thevalve member 61 and thearmature assembly 40 towards thestator assembly 21 but the force is not great enough to overcome the force exerted by thefirst spring 56. Therefore, the net resulting force from the twosprings valve member 61 to assume a second stop position in contact with thevalve seat 64 that corresponds to either an open or a closed position which in turn controls the flow of fluid and/or pressure through thefuel injector 10 depending on the configuration of thevalve assembly 60. Thearmature assembly 40 is positioned away from theplanar bottom surface 26 and the distance from the planar surface 50 of theflux piece 45 to theplanar bottom surface 26 of thestator assembly 21 along thelongitudinal axis 35 of the guide bore 33 is the initial air gap. - As the
solenoid actuator 20 is switched to its on state, thearmature assembly 40 moves from its second position to its first position. Switching thesolenoid actuator 20 on energizes thecoil 29. Thecoil 29 produces a magnetic field around thestator assembly 21 and creates a magnetic force in the surrounding region. The force of the magnetic field is strong enough to pull thearmature assembly 40 towards thestator assembly 21. This force is greater than the force of thespring 56 hence causing thearmature assembly 40 to move towards thestator assembly 21. In addition, when thearmature assembly 40 is pulled towards thestator assembly 21, thearmature assembly 40 may be pulled faster than thevalve member 61 is pushed upward by thesecond spring 58. This allows thearmature assembly 40 to lose contact with thevalve member 61. Thevalve member 61 moves from the second stop position to a first stop position that corresponds to either an open or a closed position which in turn controls the flow of fluid and/or pressure through thefuel injector 10 depending on the fluid configuration of thevalve assembly 60. Theguide piece 43 moves up the guide bore 33 of thestator assembly 21 maintaining a guide clearance with theguide sleeve 31. Theguide piece 43 stops moving when thestop surface 75 on theguide piece 43 comes in contact with thestop surface 77 on theguide sleeve 31. Atop surface 49 on theguide piece 43 remains in contact with thefirst spring 56. The distance between theplanar bottom surface 26 ofstator assembly 21 and the top surface 50 on theflux piece 45 is at its smallest distance, corresponding to thefinal air gap 70, and may be equal to the distance between thestop surface 75 on theguide piece 43 and the top surface 50 on theflux piece 45. When thearmature assembly 40 is in the first position, thefirst spring 56 exerts a bias force on theguide piece 43. However, as long as thecoil 29 is energized, the magnetic force is exerted on thearmature assembly 40 and thearmature assembly 40 remains in the first position. Depending on the fluid connections, fuel injection events may be initiated and ended by energizing andde-energizing solenoid actuator 20 in a known manner. - Finally, the
solenoid actuator 20 is turned off again and thecoil 29 is de-energized. Thecoil 29 no longer provides a magnetic force therefore allowing the net resulting force of thesprings armature assembly 40 to move from the first position to the second position again. Thefirst spring 56 exerts a force on thetop surface 49 on theguide piece 43. Thestop surface 75 on theguide piece 43 loses contact with thestop surface 77 on theguide sleeve 31, while thebottom impact surface 48 on theguide piece 43 comes back in contact with thevalve member 61 pushing thevalve member 61 back to its original position, and thereby allowing thevalve member 61 to control the fluid flow and/or pressure through thefuel injector 10 again. Thearmature assembly 40 finally stops when it reaches the second position, wherein the distance between theflux piece 45 and theplanar bottom surface 26 is equal to the initial air gap 69. - The
armature assembly 40 continues to move from the second position to the first position and back as long as thesolenoid actuator 20 is turned on and turned off. This continuous process demonstrates why it may be important for the impact surfaces of theguide piece 43 to be made of a hard, impact resistant material. The continuous pounding of thebottom surface 48 and thestop surface 75 of theguide piece 43 withmember 61 and theguide sleeve 31, respectively, cause wear and tear on the surfaces on theguide piece 43 possibly requiring the impact surfaces ofguide piece 43 to be made of a material able to withstand these impacts over extended periods of use. It is known to those in the art that theflux piece 45 should be made of a soft material possessing superior magnetic properties in order to move between the first and second position with less force than might otherwise be needed. With the structure shown, the travel distance ofvalve member 61 will inherently be smaller than the travel distance ofarmature assembly 40. - This disclosure provides numerous ways to reduce the initial and final air gap of solenoid actuators and improve parallelism between the top surface 50 on the
flux piece 45 and thebottom surface 26 on thestator assembly 21. Grinding thestop surface 75 on theguide piece 43, after attaching thearmature assembly 40, may permit smaller geometric variations than in the past. Grinding thesurface 75 after the attaching step eliminates the need to develop parts with ever increasingly tightened geometric tolerances because the grinding step after attachment allows parts with larger geometric variations to be ground to the same predetermined dimensions. Furthermore, when thearmature assembly 40 is ground (guide surfaces 36, 37 and stop surface 75) in a single chucking, theguide piece 43 and theflux piece 45 are oriented more accurately than if ground in more than a single chucking. This produces an improved, more geometrically alignedstop surface 75 on theguide piece 43 and better parallelism between the top surface 50 on theflux piece 45 and theplanar bottom surface 26 of thestator assembly 21. - It should be understood that the above description is intended for illustrative purposes only, and is not intended to limit the scope of the present disclosure in any way. Thus, those skilled in the art will appreciate that other aspects of the disclosure can be obtained from a study of the drawings, the disclosure and the appended claims.
Claims (20)
1. A fuel injector comprising:
an armature assembly including a flux piece attached to a guide piece which includes a stop surface;
the guide piece being slidably movable from a first position where the guide piece is out of contact with a valve member and the stop surface on the guide piece is in contact with a stator assembly, and a second position where the guide piece is in contact with the valve member and the stop surface on the guide piece is out of contact with the stator assembly.
2. The fuel injector of claim 1 wherein:
the valve member moves a valve travel distance between a first stop and a second stop;
the armature assembly moves an armature travel distance between the first position and the second position;
the armature travel distance being greater than the valve travel distance.
3. The fuel injector of claim 1 further including:
a first spring operatively positioned to bias the armature assembly towards the second position;
a second spring operatively positioned to bias the valve member towards the second stop.
4. The fuel injector of claim 3 wherein:
the first spring has a first preload;
the second spring has a second preload;
the first preload being greater than the second preload.
5. The fuel injector of claim 3 wherein energizing the stator assembly pulls the armature assembly towards the first position against the bias of the first spring.
6. The fuel injector of claim 1 wherein energizing the stator assembly operatively moves the armature assembly and the valve member.
7. The fuel injector of claim 1 wherein:
the armature assembly being guided via an interaction between the guide piece and a guide sleeve of the stator assembly;
the guide piece having a first guide surface separated from a second guide surface by a reduced diameter section; and
an air gap being defined by a distance between a surface on the flux piece and the stop surface along an axis of a guide bore defined by the guide sleeve.
8. A fuel injector comprising:
solenoid actuator assembly, which includes an armature assembly and a stator assembly, mounted in an injector body;
the armature assembly including a flux piece attached to a guide piece;
the stator assembly includes an inner pole piece with an inner wall in contact with a guide sleeve defining a guide bore;
the guide piece being slidably received in the guide bore, and having a stop surface movable between a first position in contact with the stator assembly and a second position out of contact with the stator assembly; and
an air gap being defined between a bottom surface on the stator assembly and a top surface on the flux piece when the guide piece is in the first position.
9. The fuel injector of claim 8 wherein a distance between the top surface on the flux piece and the stop surface along an axis of the guide bore equals the air gap.
10. The fuel injector of claim 8 wherein the flux piece is welded to the guide piece.
11. The fuel injector of claim 8 wherein the flux piece is press fitted onto the guide piece.
12. The fuel injector of claim 8 wherein the air gap is about 0.05 mm.
13. The fuel injector of claim 8 wherein the armature assembly is guided via an interaction between the guide piece and the guide sleeve of the stator assembly.
14. The fuel injector of claim 13 wherein the guide piece includes a first guide surface separated from a second guide surface by a reduced diameter section; and
a valve member unattached to, but in contact with, the guide piece.
15. The fuel injector of claim 8 wherein the bottom surface, which is partially defined by the guide sleeve and the inner pole piece, is planar.
16. The fuel injector of claim 8 including a first spring that biases the armature assembly away from the stator assembly; and
a second spring that biases the armature assembly toward the stator assembly.
17. The fuel injector of claim 8 wherein the stator assembly includes a coil positioned in a cavity defined by the inner pole piece and an outer pole piece.
18. The fuel injector of claim 8 including a valve member out of contact with armature assembly at the first position, but the valve member being in contact with the armature assembly at the second position.
19. The fuel injector of claim 8 including a valve member that moves a valve travel distance between a first stop and a second stop;
the armature assembly moves an armature travel distance between the first position and the second position; and
the armature travel distance is greater than the valve travel distance.
20. A fuel injector comprising:
solenoid actuator assembly, which includes an armature assembly and a stator assembly, mounted in an injector body;
the armature assembly including a flux piece attached to a guide piece;
the stator assembly having a planar bottom surface;
the guide piece having a stop surface movable between a first position in contact with planar bottom surface of the stator assembly and a second position out of contact with the stator assembly;
the flux piece being out of contact with the stator assembly at both the first position and the second position, the flux piece being separated from the planar bottom surface of the stator assembly by an air gap at the first position; and
a distance between a top surface on the flux piece and the stop surface of the guide piece along an axis of the guide piece equals the air gap.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US13/306,264 US20120067981A1 (en) | 2008-07-08 | 2011-11-29 | Precision Ground Armature Assembly For Solenoid Actuator And Fuel Injector Using Same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/217,622 US8083206B2 (en) | 2008-07-08 | 2008-07-08 | Precision ground armature assembly for solenoid actuator and fuel injector using same |
US13/306,264 US20120067981A1 (en) | 2008-07-08 | 2011-11-29 | Precision Ground Armature Assembly For Solenoid Actuator And Fuel Injector Using Same |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/217,622 Division US8083206B2 (en) | 2008-07-08 | 2008-07-08 | Precision ground armature assembly for solenoid actuator and fuel injector using same |
Publications (1)
Publication Number | Publication Date |
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US20120067981A1 true US20120067981A1 (en) | 2012-03-22 |
Family
ID=41503810
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Application Number | Title | Priority Date | Filing Date |
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US12/217,622 Expired - Fee Related US8083206B2 (en) | 2008-07-08 | 2008-07-08 | Precision ground armature assembly for solenoid actuator and fuel injector using same |
US13/306,264 Abandoned US20120067981A1 (en) | 2008-07-08 | 2011-11-29 | Precision Ground Armature Assembly For Solenoid Actuator And Fuel Injector Using Same |
Family Applications Before (1)
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US12/217,622 Expired - Fee Related US8083206B2 (en) | 2008-07-08 | 2008-07-08 | Precision ground armature assembly for solenoid actuator and fuel injector using same |
Country Status (4)
Country | Link |
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US (2) | US8083206B2 (en) |
CN (1) | CN102089513A (en) |
DE (1) | DE112009001630T5 (en) |
WO (1) | WO2010006040A1 (en) |
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JP2014092100A (en) * | 2012-11-05 | 2014-05-19 | Keihin Corp | Electromagnetic fuel injection valve |
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DE102012209229A1 (en) * | 2012-05-31 | 2013-12-05 | Robert Bosch Gmbh | fuel injector |
US9347579B2 (en) | 2013-10-03 | 2016-05-24 | Hamilton Sundstrand Corporation | Flux bypass for solenoid actuator |
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WO2019012969A1 (en) * | 2017-07-14 | 2019-01-17 | 日立オートモティブシステムズ株式会社 | Solenoid intake valve, and high-pressure fuel pump provided therewith |
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US6793196B2 (en) * | 2002-08-05 | 2004-09-21 | Husco International, Inc. | High flow control valve for motor vehicle fuel injection systems |
US7156368B2 (en) * | 2004-04-14 | 2007-01-02 | Cummins Inc. | Solenoid actuated flow controller valve |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014092100A (en) * | 2012-11-05 | 2014-05-19 | Keihin Corp | Electromagnetic fuel injection valve |
Also Published As
Publication number | Publication date |
---|---|
US8083206B2 (en) | 2011-12-27 |
WO2010006040A1 (en) | 2010-01-14 |
DE112009001630T5 (en) | 2011-05-19 |
US20100005646A1 (en) | 2010-01-14 |
CN102089513A (en) | 2011-06-08 |
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