WO2010066533A1 - Élément d'actionnement d'une unité de réglage électromagnétique de soupape hydraulique - Google Patents

Élément d'actionnement d'une unité de réglage électromagnétique de soupape hydraulique Download PDF

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Publication number
WO2010066533A1
WO2010066533A1 PCT/EP2009/065150 EP2009065150W WO2010066533A1 WO 2010066533 A1 WO2010066533 A1 WO 2010066533A1 EP 2009065150 W EP2009065150 W EP 2009065150W WO 2010066533 A1 WO2010066533 A1 WO 2010066533A1
Authority
WO
WIPO (PCT)
Prior art keywords
push rod
armature
actuating element
actuator
valve
Prior art date
Application number
PCT/EP2009/065150
Other languages
German (de)
English (en)
Inventor
Jens Hoppe
Ali Bayrakdar
Original Assignee
Schaeffler 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 Kg filed Critical Schaeffler Kg
Publication of WO2010066533A1 publication Critical patent/WO2010066533A1/fr

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Classifications

    • 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
    • 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 displaceably arranged in the adjusting unit, and a push rod fixedly connected to the armature.
  • 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 A1.
  • the electromagnetic actuator is fixedly connected to the valve portion.
  • the electromagnetic actuator is composed in this case of a first magnetic yoke, a coil, a second magnetic yoke, a housing, an actuator and a connection element which receives an electrical connector, 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 displaceable 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.
  • 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 likewise 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 anchor rod attached to 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 is formed.
  • the armature and the push rod form an actuating element, which can be displaced by energizing the coil in the axial direction and the control piston of the hydraulic section is actuated, that is 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 fixed in place on 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 design of the electromagnetic actuator are largely analogous to that 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, block or release the pressure medium flow through one of the valve seats.
  • the working port can selectively with the inlet port or connected 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 pot-shaped with a bottom and a cylindrical see section with a cylindrical inner 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 hysteresis occurring.
  • 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.
  • Teflon a sliding coating
  • This cavity can on the one hand, act by a negative pressure occurring in this, inhibiting movement of the armature away from the ground.
  • leaking oil entering this cavity can inhibit axial movement of the anchor to the ground.
  • DE 100 51 614 A1 is proposed to solve this problem to provide the anchor with axial holes or axially extending grooves on the outer circumferential surface to allow pressure equalization between the cavities before and behind the anchor. Also in this embodiment, the push rod is force-fit pressed into a receptacle of the armature.
  • 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, whereby the production cost is minimized and its manufacturing costs to be reduced.
  • the push rod consists of a metal or a metal alloy, wherein the push rod is at least partially cured by means of a work hardening process.
  • the actuating element of an electromagnetic actuating unit of a hydraulic valve comprises at least one armature and a push rod.
  • the armature moves under the influence of a magnetic field, which is caused by energizing a coil of the actuator.
  • the push rod is firmly connected to the armature, so that they move these components as a unit.
  • the push rod bears against a control piston of the hydraulic section of the hydraulic valve.
  • the actuator is moved relative to this when changing the energization of the coil, wherein the push rod transmits this movement to the control piston.
  • the push rod is usually fitted in a receptacle of the armature, which is made with excess to the receptacle and pressed into it, whereby a non-positive connection between the two components is produced.
  • the push rod may be partially hollow. From the resulting mass reduction of the actuator, the response of the actuator can be significantly improved.
  • the push rod can also be solid, ie formed without cavities.
  • the push rod can for example, consist of a light metal, such as aluminum.
  • the weight of the actuator is significantly reduced.
  • the push rod is made of a non-magnetizable material, such as a non-magnetizable steel or aluminum.
  • the material of the push rod is briefly applied to the desired locations with a force, so that a cold deformation, that is, a deformation significantly below the recrystallization takes place.
  • the plastic deformation increases the dislocation density (number of lattice defects) within the material, thus increasing the hardness of the sites applied with the force.
  • one end of the push rod engages a control piston and the surface of the push rod is hardened in this contact region by means of the work hardening process.
  • the end of the push rod is formed hemispherical during the work hardening process, whereby lateral forces from the frictional contact with the control piston, axial offsets and tilting can be compensated.
  • the push rod is mounted displaceably in the setting unit and that the bearing surface of the push rod is hardened by means of the work hardening process.
  • the outer surface By hardening the outer surface, at least the portions of the outer surface that are highly stressed, the life of the actuator is significantly increased. Furthermore, the wear is reduced, so that there is no danger that peeled off by the push rod parts within the actuator affect their functionality.
  • This projection can serve as a stop, for example, which limits the press-in path of the push rod into the receptacle of the armature.
  • this projection can also serve as a stop with respect to one of the magnetic yokes.
  • the projection in this case limits the displacement of the actuating element during operation of the electromagnetic actuator in that it comes to rest on the magnetic yoke.
  • measures for curing the anchor can be dispensed with.
  • the projection may be formed, for example, as a circumferential in the direction of the push rod rotating disk.
  • FIG. 1 shows an electromagnetic actuating unit of a hydraulic valve with a first actuating element according to the invention in longitudinal section
  • FIG. 2 shows an electromagnetic actuator of a hydraulic valve with a second actuator according to the invention in longitudinal section.
  • FIG. 1 shows an electromagnetic actuating unit 1 of a hydraulic valve with a first embodiment according to the invention of an actuating element 20 in longitudinal section.
  • the electromagnetic actuator 1 has a bobbin 2, which carries a coil 4 consisting of several turns of a suitable wire, which is at least partially surrounded by an encapsulation 5 of non-magnetizable material.
  • a first magnetic yoke 6 has a disk-shaped and a sleeve-shaped section 6a, 6b, wherein the sleeve-shaped section in FIG. 6b extends into the interior of the bobbin 2.
  • the sleeve-shaped portion 6b engages in a cavity radially inside the bobbin 2, wherein the outer diameter is adapted to the inner diameter of the bobbin 2.
  • the disc-shaped section 6a abuts the coil body 2 or 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 into the coil body 2 in the axial direction.
  • 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 magnetic yokes 6, 9 delimit an armature space 12, in which an axially displaceable actuating element 20 is arranged.
  • the actuating element 20 comprises an armature 13 and a push rod 14 fixedly connected to the armature 13.
  • the push rod 14 is partially disposed in a receptacle 21 of the armature 13 and extends through an opening 15 formed on the second magnetic yoke 9, one end of the push rod 14 in the assembled state of the actuating unit 1 rests against a partially shown control piston 3 of the hydraulic section of the hydraulic valve, not shown otherwise.
  • the actuating element 20 is displaced and thus the control piston 3 of the directional control valve is actuated.
  • 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.
  • current flows through the coil 4 acts on the armature 13, a force in the direction of the second magnetic yoke 9, which is dependent on the amount of current to the coil 4.
  • the armature 13 is provided with axially extending bores 18 which are open on both axial side surfaces of the armature 13.
  • the holes 18 thus connect two cavities 19 which are arranged in the axial direction of the armature 13 and are separated from it.
  • a pressure equalization between the cavities 19 can take place via the bores 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.
  • the push rod 14 is in the embodiment shown in Figure 1 solid, ie not hollow, formed.
  • the push rod 14 is frictionally secured in the receptacle 21 of the armature 13. This can be achieved, for example, by making the push rod 14 slightly oversized with the receptacle 21 and pressing it into it.
  • the projection 17 serves as a travel limit during the pressing of the push rod 14 in the receptacle 21.
  • the projection 17 serves as a stop against the second magnetic yoke 9 during operation of the actuator 1.
  • FIG. 2 shows push rod 14 of a second embodiment of an actuating element 20 according to the invention in longitudinal section.
  • this push rod 14 is hollow, like a blind hole, formed, whereby the weight of the actuating element 20 is reduced. Furthermore, no projection 17 is formed on the lateral surface of the push rod 14, which leads to a further reduction of the weight of the push rod 14.
  • the push rod 14 is advantageously made of a Vietnamesemagnetisierba- ren material on the one hand not to disturb the magnetic field generated by the coil 4 and on the other hand to prevent magnetizable particles collected from the lubricating / pressure fluid of the internal combustion engine and introduced into the actuator 1 whereby the sliding surfaces of the sliding sleeve 16, the push rod 14, the armature 13 or the first and second magnetic yoke 6, 9 can be damaged.
  • the push rod 14 is made of a suitable metal or a suitable metal alloy.
  • a suitable metal or a suitable metal alloy for example, non-magnetizable steels can be used, as a result of which a high resistance force of the push rod 14 can be achieved with respect to forces acting on it.
  • light metals may be provided, for example aluminum or magnesium, whereby the weight of the push rod 14 is reduced and thus the response speed of the actuator 1 or its hysteresis behavior is positively influenced.

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

Abstract

Élément d'actionnement (22) d'une unité de réglage électromagnétique (1) de soupape hydraulique, qui comporte au moins un induit (13) disposé de manière à coulisser longitudinalement dans l'unité de réglage (1) et une tige de poussoir (14) reliée fixement à l'induit (13). La tige de poussoir, qui est constituée d'un métal ou d'un alliage métallique, est durcie au moins en partie à l'aide d'un procédé d'écrouissage.
PCT/EP2009/065150 2008-12-10 2009-11-13 Élément d'actionnement d'une unité de réglage électromagnétique de soupape hydraulique WO2010066533A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810061396 DE102008061396A1 (de) 2008-12-10 2008-12-10 Betätigungselement einer elektromagnetischen Stelleinheit eines Hydraulikventils
DE102008061396.7 2008-12-10

Publications (1)

Publication Number Publication Date
WO2010066533A1 true WO2010066533A1 (fr) 2010-06-17

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ID=41558196

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/065150 WO2010066533A1 (fr) 2008-12-10 2009-11-13 Élément d'actionnement d'une unité de réglage électromagnétique de soupape hydraulique

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Country Link
DE (1) DE102008061396A1 (fr)
WO (1) WO2010066533A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015200976B4 (de) 2015-01-22 2020-07-16 Schaeffler Technologies AG & Co. KG Nockenwellenverstelleinheit mit einem Betätigungselement für ein Steuerventil
DE102017124287A1 (de) 2017-10-18 2019-04-18 Schaeffler Technologies AG & Co. KG Elektromagnetische Stellvorrichtung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4553735A (en) * 1982-01-13 1985-11-19 Brundage Robert W Solenoid controlled valve
DE102005050887B3 (de) * 2005-10-21 2007-03-08 Hydraulik-Ring Gmbh Elektromagnet für hydraulische Ansteuerungen
DE202006011905U1 (de) * 2006-08-03 2007-12-06 Eto Magnetic Kg Elektromagnetische Stellvorrichtung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE102006031517A1 (de) 2006-07-07 2008-01-10 Schaeffler Kg Schalteinrichtung für eine druckölbetätigte Nockenwellenstellvorrichtung, sowie Montageverfahren zum Einbau derselben in eine Brennkraftmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4553735A (en) * 1982-01-13 1985-11-19 Brundage Robert W Solenoid controlled valve
DE102005050887B3 (de) * 2005-10-21 2007-03-08 Hydraulik-Ring Gmbh Elektromagnet für hydraulische Ansteuerungen
DE202006011905U1 (de) * 2006-08-03 2007-12-06 Eto Magnetic Kg Elektromagnetische Stellvorrichtung

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Publication number Publication date
DE102008061396A1 (de) 2010-06-17

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