EP2377132A1 - Élément d'actionnement d'une unité de commande électromagnétique d'une soupape hydraulique - Google Patents

Élément d'actionnement d'une unité de commande électromagnétique d'une soupape hydraulique

Info

Publication number
EP2377132A1
EP2377132A1 EP09756294A EP09756294A EP2377132A1 EP 2377132 A1 EP2377132 A1 EP 2377132A1 EP 09756294 A EP09756294 A EP 09756294A EP 09756294 A EP09756294 A EP 09756294A EP 2377132 A1 EP2377132 A1 EP 2377132A1
Authority
EP
European Patent Office
Prior art keywords
armature
push rod
actuating element
valve
actuator
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Withdrawn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
EP09756294A
Other languages
German (de)
English (en)
Inventor
Ralf-Dieter Schroth
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.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
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 Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Publication of EP2377132A1 publication Critical patent/EP2377132A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/08—Cores, Yokes, or armatures made from powder
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
    • F01L2001/34423—Details relating to the hydraulic feeding circuit
    • F01L2001/34426—Oil control valves
    • F01L2001/3443—Solenoid driven oil control valves
    • 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
    • H01F7/081—Magnetic constructions
    • H01F2007/086—Structural details of the armature

Definitions

  • the invention relates to an actuating element of an electromagnetic actuating unit of a hydraulic valve, which has at least one armature, which is arranged longitudinally displaceable in the adjusting unit, and a push rod fixedly connected to the armature and a method for producing an actuating element.
  • Such directional control valves are used in internal combustion engines, for example for controlling hydraulic camshaft adjusters or switchable cam followers.
  • the directional control valves consist of an electromagnetic actuator and a hydraulic section. At least one inlet connection, at least one working connection and a tank connection are formed on the hydraulic section.
  • the electromagnetic actuator unit specific connections of the hydraulic section can be hydraulically connected to each other and thus the pressure medium flows are directed.
  • the hydraulic valve is normally designed as a 4/3 proportional directional control valve.
  • a proportional valve is disclosed for example in DE 199 56 160.
  • the electromagnetic actuator is fixedly connected to the valve portion.
  • the electromagnetic control unit is composed of a first magnetic yoke, a coil, a second magnetic yoke, a housing, an actuating element and a connecting element, which has an electrical plug-in connection. takes, which serves to power the coil together.
  • the actuator consists of an armature and a push rod.
  • the hydraulic section consists of a valve housing and a control piston arranged axially displaceably therein.
  • the valve housing is arranged within a receiving opening of the second magnetic yoke and fixedly connected thereto.
  • On the outer circumferential surface of the valve housing four annular grooves are formed, which serve as pressure medium connections. In the Nutchezn the annular grooves openings are formed, whereby pressure fluid can reach into the interior of the valve housing.
  • a control piston is arranged axially displaceable, wherein the outer diameter of the control piston is adapted to the inner diameter of the valve housing.
  • ring grooves are also formed on the control piston, via which adjacent pressure medium connections can be connected to one another.
  • the coil, the first and the second magnetic yoke are arranged coaxially within the housing of the electromagnetic actuator.
  • the first and the second yoke are offset from each other in the axial direction.
  • In the region between the first and the second magnetic yoke is located radially within the magnetic yokes of the armature, which is surrounded in the radial direction of the coil.
  • the armature, the housing, the first and the second magnetic yoke form a flux path for the magnetic flux lines, which are caused by energizing the coil.
  • the armature By energizing the coil, the armature is urged in the direction of the second magnetic yoke, wherein this movement is transmitted by means of the armature mounted on the push rod on the control piston. This is now moved against a spring supported on the valve housing in the axial direction.
  • the push rod is arranged in a receptacle of the armature and firmly connected thereto. This is realized in that the push rod is made with excess to the recording and pressed into it, so that a frictional connection between the armature and the push rod arises.
  • the armature and the push rod form an actuating element, which can be displaced by energizing the coil in the axial direction and actuates the control piston of the hydraulic section, ie positioned within the valve housing of the hydraulic section.
  • the hydraulic section is configured separately from the electromagnetic actuator and accommodated in a cavity of a camshaft, wherein the hydraulic section rotates with the camshaft during operation of the internal combustion engine.
  • the actuator is fixedly attached to a cylinder head cover or cylinder head.
  • the positioning is again effected by an actuating element, which comprises an armature and a push rod connected thereto.
  • the adjusting movement of the armature by means of the push rod which is pressed into a receptacle of the armature, transmitted to the control piston of the valve section.
  • Directional valves for controlling switchable cam followers are usually designed as switching valves.
  • a switching valve is, in one embodiment known as a 3/2-way valve, for example from DE 102 52 431 A1.
  • the electromagnetic actuator in turn consists of a housing, an actuating element, consisting of an armature and a push rod, a connection element, a first and a second yoke.
  • the function and the design of the electromagnetic actuator are largely analogous to those of the proportional valve.
  • an inlet connection, a working connection and a tank connection are formed on the hydraulic section.
  • the working connection communicates via a respective valve seat designed as opening with both the inlet and the tank connection.
  • a control piston is further arranged, on which two closing elements are formed. Each closing element can, depending on the position of the control piston within the valve housing, the pressure medium flow through a lock or release the valve seats. Depending on the axial position of the control piston, the working connection can thus be selectively connected to the inlet connection or to the tank connection.
  • the axial position of the control piston is in turn set via the axial position of the actuating element relative to the second magnetic yoke.
  • an armature guide sleeve is arranged within a magnetic yoke, in which an actuating element, consisting of an armature and a push rod, is received axially displaceable.
  • the armature guide sleeve is cup-shaped with a bottom and a cylindrical portion formed with a cylindrical inner circumferential surface. The cylindrical inner circumferential surface serves to guide the armature, wherein the bottom limits the axial travel of the armature in an axial direction.
  • the friction between the armature and the armature guide sleeve has a significant influence on the characteristics of the hydraulic valve, especially on the occurring hysteresis.
  • low frictional forces are provided in the prior art.
  • friction-reducing measures such as formations of the armature or bearing elements between these components, are provided in the prior art.
  • it may be provided to provide the anchor with a sliding coating, such as Teflon.
  • a closed cavity is formed between the bottom of the armature guide sleeve and the armature flush with the inner circumferential surface.
  • this cavity can act, by means of a negative pressure occurring in the latter, on the movement of the armature away from the floor. Furthermore, leaking oil entering this cavity can inhibit axial movement of the anchor to the ground.
  • DE 100 51 614 A1 proposes to solve this problem by providing the armature with axial bores or axially extending grooves on its outer peripheral surface in order to allow pressure equalization between the cavities in front of and behind the armature. Also in this embodiment, the push rod is non-positively pressed into a receptacle of the armature.
  • Disadvantages of the proposed embodiment are its high manufacturing costs, which are caused by the machining and reworking of the armature consisting of a magnetizable material in order to form, for example, the axially running grooves or bores. Furthermore, the pressing of the push rod into the receptacle of the armature is a cost and time consuming process step, which is also prone to error, so that the throughput rate is relatively low and the manufacturing cost and the rejection rate are relatively high. In addition, the connection between the armature and the push rod during the operation of the internal combustion engine can loosen, whereby the characteristic curve is adversely affected. Another disadvantage is the high manufacturing cost of the anchor usually produced in a machining process.
  • the invention is therefore based on the object to avoid these disadvantages and thus to provide an actuating element of an electromagnetic actuator of a directional control valve, wherein minimizes its Stanfordsauf- to increase process reliability and thus its production costs should be reduced.
  • the object is achieved in that the anchor is made of sintered steel.
  • the armature has a receptacle into which a push rod engages at least partially, wherein at least one recess and at the other surface at least one recess are formed on an outer surface of the push rod or the boundary surface of the receptacle the bulge engages in the recess such that a positive connection between the armature and the push rod is formed.
  • the pushrod solid ie not hollow, be formed.
  • the armature has at least a longitudinal channel which extends in the direction of displacement and is open at both lying in the direction of displacement of the armature side surfaces.
  • the longitudinal channel may be formed, for example, as a groove on an outer circumferential surface of the armature.
  • longitudinal channels can be represented that lie completely within the armature.
  • Anchors in sintered construction are considerably less expensive to produce than anchors which are produced by means of machining operations.
  • further structures can be realized on the armature during the shaping process, so that no post-processing steps are necessary.
  • longitudinal channels in the form of grooves or completely enclosed by the anchor channels can be realized without additional steps.
  • connection between the armature and the push rod can also be made during the sintering process.
  • the push rod is inserted into the sintered mold so that it partially engages in the starting material of the armature, for example steel powder. Subsequently, the sintering process is carried out, whereby at the same time a frictional connection between the armature and the push rod is made without the need for a further assembly step.
  • a positive connection between the two components can be realized.
  • the push rod is provided with at least one bulge or depression. During the sintering process, the material of the armature adapts to the shape of the push rod, whereby a recess or bulge is formed on this, which produces a positive connection with the bulge or depression of the push rod. The positive connection strengthens the connection between the armature and the push rod, so that it is not released during operation of the internal combustion engine.
  • the object is further achieved by a method for producing an actuating element of an electromagnetic actuating unit of a hydraulic dissolved, wherein the actuating element comprises at least one anchor, and a fixedly connected to the anchor push rod, wherein according to the invention the anchor is made by means of a sintering process.
  • the anchor forming material is introduced and a push rod is inserted such that it is partially disposed in the material, in which case the anchor is formed sintering technology and during this formation of the anchor, the push rod fixed, such as non-positive or non-positively and in addition positively, is connected to the anchor.
  • FIG. 1 shows an electromagnetic actuating unit of a hydraulic valve with an actuating element according to the invention
  • FIG. 2 shows a longitudinal section through the actuating element on FIG. 1,
  • FIG. 3 shows a longitudinal section through a second embodiment of an actuating element according to the invention
  • FIG. 4 shows a longitudinal section through a third embodiment of an actuating element according to the invention.
  • FIG. 1 shows an electromagnetic actuating unit 1 of a hydraulic valve with a first embodiment according to the invention of an actuating element 22 in longitudinal section.
  • the electromagnetic actuating unit 1 has a coil body 2 and a connecting element formed integrally therewith 3 on.
  • the bobbin 2 carries a coil 4 consisting of a plurality of turns of a suitable wire and is at least partially surrounded by an encapsulation 5 of non-magnetizable material.
  • a first magnetic yoke 6 is arranged, which in the illustrated embodiment has a disc-like and a sleeve-like section 6a, 6b.
  • the sleeve-like portion 6b engages in a cavity radially within the encapsulation 5 of the coil 4, wherein the outer diameter of the inner diameter of the encapsulation 5 is adjusted.
  • the disk-like section 6a abuts the encapsulation 5 in the axial direction and thus determines the axial position of the first magnetic yoke 6.
  • the bobbin 2 is further arranged in a cup-shaped housing 7, in the bottom of a receiving opening 8 is provided.
  • a second magnetic yoke 9 is received, which projects in the axial direction in the extrusion coating 5 in.
  • the open ends 10 of the first and second magnetic yoke 6, 9 are axially opposite one another via an air gap 11.
  • the first and second yoke 6, 9 define an armature space 12, in which an axially displaceable actuating element 22 is arranged.
  • the actuator 22 includes an armature 13 and a fixedly connected to the armature 13 push rod 14.
  • the push rod 14 is partially disposed in a receptacle 23 of the armature 13 and extends through an opening formed on the second magnetic yoke 9 15, wherein one end of the push rod 14th in the mounted state of the actuating unit 1 rests against a control piston, not shown, of the hydraulic section, not shown, of the hydraulic valve.
  • the actuating element 22 is displaced and thus actuates the control piston of the directional control valve.
  • a sliding sleeve 16 is provided in order to minimize friction losses at this point.
  • the energization of the control unit 1 is regulated, whereby a magnetic field within the control unit 1 is generated.
  • the first Magnetic yoke 6, the housing 7, the second magnetic yoke 9 and the armature 13, which consist of magnetizable materials, serve as a flow path, which is completed by the air gap 11 between the armature 13 and the first and second magnetic yoke 6, 9.
  • longitudinal channel 18 On the outer circumferential surface 17 of the armature 13 is formed longitudinal channel 18 which extends in its axial direction and is formed open on both axial side surfaces of the armature 13.
  • the longitudinal channel 18 thus connects two cavities 19, which are arranged in the axial direction of the armature 13 and separated from it.
  • pressure compensation between the cavities 19 can take place via the longitudinal channel 18 and lubricant present in the actuating unit 1 can be exchanged.
  • the friction between the armature 13 and the first yoke 6 and the hysteresis of the current-path characteristic of the actuator 1 is reduced.
  • FIG. 2 shows a first embodiment of an actuating element 22 according to the invention in an enlarged view.
  • the armature 13 consists of a magnetizable sintered material, for example a suitable sintered steel.
  • the push rod 14 is made separately from the armature 13, solid, i. not hollow, formed and advantageously consists of a non-magnetizable material.
  • the starting material of the armature 13, for example steel powder, and the prefabricated push rod 14 are introduced into a suitable sintering mold.
  • the push rod 14 partially immersed in the starting material.
  • the sintering process is performed. This creates the armature 13 and at the same time a frictional connection between the border surface of the receptacle 23 of the armature 13 and the outer surface of the part of the push rod 14 which engages in the armature 13.
  • additional structures such as longitudinal channels 18, may be formed during the molding process. For this purpose, only the sintered form needs to be adjusted accordingly.
  • connection to the push rod 14 can also be made during the molding process.
  • no measures must be taken to form the receptacle 23, since this is automatically formed by the insertion of the push rod 14 in the sintering mold. This eliminates complex work steps and additional structures can be realized simply and cost-neutral by adapting the sintered form.
  • FIG. 3 shows a second embodiment of an actuating element 22 according to the invention.
  • the push rod 14 is not completely cylindrical.
  • a recesses 20 in the illustrated embodiment, an annular groove formed, into which a bulge 21 of the boundary surface of the receptacle 23 engages.
  • FIG. 4 shows a further embodiment of an actuating element 22 according to the invention.
  • the bulge 21 in the form of an annular bead is formed on the outer surface of the push rod 14.
  • This bulge 21 engages in a recess 20 (annular groove), which is formed on the boundary surface of the receptacle 23.
  • a bulge 21 or depression 20 a plurality of bulges 21 or depressions 20 can also be provided.
  • only local bulges 21 or depressions 20 may be provided which deviate from the shape of an annular groove or annular bead.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

L'invention concerne un élément d'actionnement (22) d'une unité de commande électromagnétique (1) d'une soupape hydraulique, qui présente au moins un induit (13) constitué d'acier fritté, qui est disposé dans l'unité de commande (1) de manière déplaçable longitudinalement, et une tige poussoir (14) connectée fixement à l'induit (13).
EP09756294A 2008-12-12 2009-11-13 Élément d'actionnement d'une unité de commande électromagnétique d'une soupape hydraulique Withdrawn EP2377132A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810061949 DE102008061949A1 (de) 2008-12-12 2008-12-12 Betätigungselement einer elektromagnetischen Stelleinheit eines Hydraulikventils
PCT/EP2009/065153 WO2010066536A1 (fr) 2008-12-12 2009-11-13 Élément d'actionnement d'une unité de commande électromagnétique d'une soupape hydraulique

Publications (1)

Publication Number Publication Date
EP2377132A1 true EP2377132A1 (fr) 2011-10-19

Family

ID=41511060

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09756294A Withdrawn EP2377132A1 (fr) 2008-12-12 2009-11-13 Élément d'actionnement d'une unité de commande électromagnétique d'une soupape hydraulique

Country Status (3)

Country Link
EP (1) EP2377132A1 (fr)
DE (1) DE102008061949A1 (fr)
WO (1) WO2010066536A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011077179A1 (de) * 2011-06-08 2012-12-13 Robert Bosch Gmbh Anker für ein Magnetventil und Verfahren zur Herstellung eines Ankers
IT201800004063A1 (it) * 2018-03-29 2019-09-29 Electroil S R L Procedimento per la realizzazione di una bobina a doppio solenoide per elettromagnete e bobina a doppio solenoide per elettromagnete.
FR3125573B1 (fr) * 2021-07-20 2023-07-21 Valeo Systemes De Controle Moteur Actionneur pour un système de transmission de véhicule automobile
US20250336630A1 (en) * 2024-04-26 2025-10-30 Sensata Technologies, Inc. Actuator assembly for electrical devices and methods of making

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Publication number Priority date Publication date Assignee Title
US6065495A (en) * 1999-02-04 2000-05-23 General Motors Corporation Two-position, three-way solenoid-actuated valve
JP4474626B2 (ja) 1999-10-19 2010-06-09 株式会社デンソー 電磁弁
DE19956160A1 (de) 1999-11-23 2001-05-31 Schaeffler Waelzlager Ohg Magnetventil, insbesondere hydraulisches Proportionalventil
DE10252431A1 (de) 2002-11-12 2004-05-27 Ina-Schaeffler Kg Elektromagnetisches Hydraulikventil, insbesondere 3/2-Wegeschaltventil zur Steuerung eines variablen Ventiltriebes einer Brennkraftmaschine
JP2005036929A (ja) * 2003-07-17 2005-02-10 Advics:Kk 電磁弁の弁軸付可動鉄心及びその製造方法
JP4062221B2 (ja) * 2003-09-17 2008-03-19 株式会社デンソー 電磁アクチュエータ、電磁アクチュエータの製造方法、および燃料噴射弁
DE102006031517A1 (de) 2006-07-07 2008-01-10 Schaeffler Kg Schalteinrichtung für eine druckölbetätigte Nockenwellenstellvorrichtung, sowie Montageverfahren zum Einbau derselben in eine Brennkraftmaschine

Non-Patent Citations (1)

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Title
See references of WO2010066536A1 *

Also Published As

Publication number Publication date
DE102008061949A1 (de) 2010-06-17
WO2010066536A1 (fr) 2010-06-17

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