WO2019110338A1

WO2019110338A1 - Electromagnetic actuator device, actuator system and use of an actuator device or an actuator system

Info

Publication number: WO2019110338A1
Application number: PCT/EP2018/082472
Authority: WO
Inventors: Dirk FÜLLGRABE; Anthony Laval; Michael Spielmann; Jörg BÜRSSNER; Benedikt Fendrich
Original assignee: Eto Magnetic Gmbh
Priority date: 2017-12-05
Filing date: 2018-11-26
Publication date: 2019-06-13
Also published as: DE102017128912A1

Abstract

The invention relates to an electromagnetic actuator device having armature means (14), which are mounted in an actuator housing (22) so as to be able to move in an axial direction relative to static coil means (26) as a reaction to the application of a current to the same and which have permanent magnet means (16) for a repelling interaction with core means (24) enclosed at least in sections by the coil means, wherein the coil means and an armature movement space located between the armature means and the core means are enclosed at least in sections by a magnetic flux-conducting housing shell (32) of the actuator housing (22), wherein a cross-section area and/or wall thickness of the housing shell (32) is configured and dimensioned such that a magnetic flux resistance of the housing shell in a mechanically isolating operating condition effective when a current is applied with a predetermined working coil current does not permit armature movement, and the housing shell is designed for interaction with a magnetic flux-conducting flux conductor partner (40, 40') that is or can be separately and detachably provided on the jacket side and/or engaging radial outwards such that the armature is moved in a non-isolating contact, connecting and/or interactive state of the housing shell with the flux conductor partner, which state permits a partial magnetic flux via the flux conducting partner when current at the predetermined working coil current is applied.

Description

Electromagnetic actuator device,

Actuator system and use of an actuator device or an actuator system

The present invention relates to an electromagnetic

Actuator device according to the preamble of the main claim. Further, the present invention relates to an actuator system having an electromagnetic actuator device, and the present invention relates to use of an electromagnetic device

Actuator device and an electromagnetic actuator system.

An electromagnetic actuator device according to the preamble of the main claim is known from DE 102 40 774 A1 of the Applicant. Relative to stationary coil means and in response to energization of these coil means in such an apparatus in an actuator housing, an armature unit (armature means) is movably supported in an axial direction (axial longitudinal direction and movement direction), wherein, when energizing the coil means, provided on the armature unit Permanent magnet means, such as in the form of a permanent magnet disc, repulsive act against stationary core means in the actuator housing. A housing shell enclosing the coil means of the actuator housing, realized from magnetically flow-conducting material, ensures the magnetic inference in such, as generic and generally known presumed electromagnetic actuator, wherein a working air gap of the anchor means (in DE 102 40 774 A1 by means of one of the permanent magnet adjacent Flußleitscheibe) to the surrounding and in particular the armature space radially bounding housing shell is formed.

Such a device according to the preamble of the main claim is used for a variety of control applications and has both in terms of their magnetic and operating characteristics, as well as in In view of a low-priced and mass-produced manufacturability advantages. Thus, preferred fields of application of this known technology are also (but not exclusively) in the field of motor vehicle technology, whereby, for example, the actuator device known from DE 102 40 774 A1 is used for the camshaft adjustment of an internal combustion engine.

In particular, a space-constrained area of use in a motor vehicle context places special requirements on such generic electromagnetic actuator devices. Thus, there is usually a need for optimization between necessary requirements for a force and an acceleration or speed of a generic electromagnetic actuator device, wherein respective increases usually a larger design of such actuator device, in particular also concerning the

Coil means and the magnetic flux-conducting, have. At the same time an available installation space at a place of use, in particular at a parking position of a (motor) internal combustion engine is scarce and cramped, so that there is a need for more compact, nevertheless with respect to force and dynamic positioning improved or optimized electromagnetic actuator technology.

From the applicant's WO 2010/012498 A1 an electromagnetic actuator device is known, which shows a way, a

Actuator device compact design. Here, a stationary core means (including coil means) or the armature unit enclosing and thus caring for an electromagnetic return housing replaced by a longitudinally U-shaped bracket assembly, which then shows the desired electromagnetic behavior with appropriate dimensioning. However, such is one Space-saving housing design not suitable for any (tightly dimensioned) installation space, since there is a non-round cross-sectional contour and insofar as a concrete space saving then depends on an angular position of the housing used. Also, the mechanical support and protective effect of the disclosed in this document housing is limited, in particular as lying through the bracket shape outside the leg actuator sections remain unencapsulated and pollution or other negative effects are exposed. Accordingly, it is an object of the present invention to optimize an electromagnetic actuator according to the preamble of the main claim in terms of their installation-relevant dimensions, without such a more compact design of the device, in particular of the actuator, to a deterioration of Stellkraft- or dynamic properties and mechanical stability the actuator device leads.

The object is achieved by the electromagnetic actuator device having the features of the main claim; advantageous developments of the invention are described in the subclaims. Furthermore, protection is claimed within the scope of the invention for an electromagnetic actuator system comprising the electromagnetic actuator device according to the invention as well as a flux conducting magnet which is in magnetic flux conduction and which is preferably provided as a metallic and stationary motor vehicle flux guide assembly, more preferably on an internal combustion engine , is trained. Furthermore, protection is claimed in the context of the present invention for use of the actuator device according to the invention and / or the electromagnetic actuator system according to the invention for realizing a valve and / or camshaft adjustment of an internal combustion engine. The According to the actuator device according to the invention further education dependent claims apply, as far as technically feasible, as equally the system according to the invention or the use according to the invention further education.

In an advantageous manner according to the invention, the electromagnetic actuator device makes use of the installation context at an installation location, namely in that the housing shell according to the invention is designed and dimensioned such that in a mounted state at an installation location, this housing shell can cooperate with a flux-conducting partner, which in an energized state the coil means in addition to the magnetic flux inference (via the housing shell) contributes, so that in this operating state, the housing shell on the one hand and a corresponding magnetic flux conductively connected Flußleitpartner on the other hand divide a magnetic flux or jointly conduct this total magnetic flux. This leads to the advantageous effect that the actual housing shell of the electromagnetic actuator device can be made narrower or reduced with respect to a housing shell cross section or a housing shell thickness effective for a magnetic flux, which in turn advantageously leads to an overall diameter of the actuator housing and thus of the invention Actuator smaller and thus can be made cheaper for installation in confined space conditions.

In this case and for this purpose, the flow-effective cross-sectional area or wall thickness of the housing shell according to the invention is designed so that when energized the coil means with a predetermined working coil current mechanically isolated provided (ie not operated in the assembled state) device no armature movement performs, while, when energized with the same predetermined working coil current and in the assembled state, namely the flux-conducting interaction according to the invention with (flux side or radially outward attacking) Flußleitpartner by its contribution to the magnetic flux line in the housing area, the armature movement is possible.

In this case, this predetermined working coil current according to the invention is above zero and, according to the invention, preferably at least 20%, more preferably typically at least 30%, of a maximum current entered or entered in the coil means for armature movement (alternatively: one of the coil design corresponding rated current). In accordance with the invention advantageously allows the invention, the reduction of the further training cylindrical (or at least partially cylindrical) housing shell so far that a compact actuator device can be used in confined installation spaces. It has been found to be a particularly preferred use of the invention to design this used for the supplementary or additional flux line Flussleitpartner in the form of an intercept of a (valve) rocker arm of an internal combustion engine - namely, it has been found in the invention advantageous that this Aggregate or this assembly, eg by Fierstellen adapted to the present invention reduced diameter of the cylindrical housing bore, without mechanical or functional losses on the engine assembly, but can be simultaneously used magnetically optimized. The steel material usually used for the realization of such a rocker arm fulfills the proposed role of a flux-conducting partner according to the invention which conducts the partial magnetic flux according to the invention Electromagnetic (back) closing via the housing shell complementary or reinforcing. In this case, it is also claimed as being in principle encompassed by the present invention independent protection, already a generic electromagnetic actuator device within the scope of the preamble of the main claim in or on such

Use Flussleitpartner, so far as isolated and isolated protection for the special and advantageous mechanical installation and recording situation, namely realized by the pivot axis of such a rocker arm for receiving the housing shell, can be realized without necessarily having to be reduced in flow-effective cross-section.

According to the invention and structurally advantageous, the actuator device is used for valve and / or camshaft adjustment of an internal combustion engine, wherein the further education associated with the anchor means

Tappet means on a corresponding end-side engagement portion can cause the valve or camshaft adjustment in otherwise known manner. In this regard, it is then also preferred to further develop the resetting of the actuator device extended by energization (namely with armature removed from the core section) by a correspondingly suitable embodiment of an adjustment groove of such a camshaft adjusting unit as actuator of the actuator, so that, according to the invention, the coil means are only for the purpose the pushing out or repelling of the anchor means are energized by the stationary core means.

In this context and in addition, it is also advantageous to design the electromagnetic actuator device according to the invention bistable, namely the fact that on axially opposite the core means housing end portion (in the case of an armature side provided plunger then at the outlet end of this plunger) a is provided magnetically conductive housing portion, which then not only implements a corresponding tappet guide, but also, by means of permanent magnetic adhesive effect of the armature permanent magnet means in the extended or stop state for a permanent magnetic adherence ensures that this extended position is kept de-energized (as well as the retracted and by permanent magnetic adhesion to the core means enabled anchor position). In a structurally particularly preferred manner is also provided to assign the further preferred disc-shaped and axially magnetized permanent magnet means on the armature (anchor means) axially at least one, more preferably at both ends, disk-shaped flux guides, which then, by suitable design, the air gap to the surrounding inner wall of the housing shell can; Correspondingly, the actuator device according to the invention can be dimensioned in a structurally and production-technically simple manner. While in the context of the present invention the use in a motor vehicle context, and there in particular on or in an internal combustion engine unit, is preferred, the present invention is nevertheless not limited to this use. Rather, the present invention is basically suitable for any installation context, which provides a flux-conducting and mechanically suitable flux-conducting partner for attaching or inserting the housing shell in order to realize the compactness or dimension advantages according to the invention for the actuator housing. Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawings; 1 shows a schematic longitudinal sectional view of the electromagnetic actuator device according to the invention in accordance with a first exemplary embodiment of the invention in cooperation with a flux guide (shown schematically and generically in the form of a sleeve);

2: In partial representations (a) and (b) the magnetic flux or

4 (a) shows the mechanically isolated energizing state without cooperating Flußleitpartner and part figure (b) the non-isolated Bestromungszustand with magnetically flux-conductively coupled (in the sectional view of a circular arc shown). Flussleitpartner illustrates,

3 is a diagram illustrating a relationship between

Force and coil current in the simulations of Fig. 2 (a) and (b), and Fig. 4 is a schematic longitudinal sectional view similar to Fig. 1 with a concrete installation context in a rocker shaft of a motor vehicle internal combustion engine as Flußleitpartner.

Fig. 1 illustrates in the schematic longitudinal sectional view, first, an electromagnetic actuator device according to a first embodiment of the invention, designed to effect a Stellfunktionalität with a camshaft of an internal combustion engine (not shown) formed adjusting partner, wherein an engagement-side end 10 of an armature plunger 12 of the device shown in Fig. 1 in an extended, ie in the plane of FIG. 1 to the right moved state of an armature unit 14, this Engaging end drives in a camshaft adjustment causing adjustment groove.

As the longitudinal sectional view of Fig. 1 illustrates in addition, sits for the realization of the armature unit 14 (anchor means) on the plunger 12 a diameter in relation to a maximum ram diameter widened permanent magnet disc 16, which, axially magnetized, at both ends of a pair of a magnetically conductive material realized flow guide disks 18 and 20 is enclosed. In the retracted or initial state shown in FIG. 1, the armature unit 14 bears with its axially end-side flux guide disk 20 against a core unit 24 which is provided stationarily in an actuator housing 22. In the case of the radially symmetrical configuration shown in FIG. 1, this core unit 24 (core means) is enclosed by a coil unit 26 for which a coil winding 28 (which can be energized by electrical contacts, not shown) is seated on a coil carrier 30 (typically non-magnetically conductive).

A housing shell section 32 defining the cylindrical outer jacket of the housing 22 not only surrounds the coil unit 26 together with the core unit 24 recessed therein, but also forms a working air gap 34 with its (hollow cylindrical) inner wall for the flux guide disk 18 of the armature unit 14 (larger in diameter) out as soon as the coil unit 26 is energized. This makes it clear that the housing shell 24 acts as a magnetically conductive and an electromagnetic conclusion enabling assembly in the magnetic circuit of the arrangement shown. In accordance with the invention, and in this respect delimiting the state of the art according to DE 102 40 774 A1 used as generic, however, a wall thickness of the housing shell 32 (and insofar a magnetically flow-effective material cross section of this assembly made of a magnetically conductive steel material) compared to the prior art reduced, and to the extent that at a predetermined, an armature movement enabling energizing the coil winding 28, the magnetic force would not be sufficient to the anchor unit (which permanently magnetically adheres to the core 24 by means of the permanent magnet disc 16) and then by repelling in an extended ( in the figure plane of Fig. 1 axially to the right) to drive. For this purpose, in the embodiment of Fig. 1 and without first the shell side or radially vorzusehenden Flußleitpartner 40, a magnetic flow resistance of the - thin - housing shell 32 is too large (up to a possible saturation in a registered in the coil winding 28 coil current).

On the other hand, it enables exactly that in FIG. 1 generically and schematically in the form of a sleeve 22 enclosing shell side enclosing Flussleitpartner 40 that this additional (and typically provided directly to a mounting location) assembly makes a contribution to the flow conduction of the housing shell 32, namely thereby, that a further or partial magnetic flux flows in the current state along or through the partner 40, in addition to the magnetic flux through the housing shell 32nd

In a concrete installation context of the present invention, insofar as according to a preferred embodiment, the Flußleitpartner is in the form of a (in the analogous to FIG. 1 designed and corresponding to FIG. 1 and its functional components reference numerals 4 illustrates as a disk-shaped or annular unit 40 ', in which a breakthrough adapted to a cylindrical outer diameter d of the housing shell 32 is introduced so that the actuator device of FIG. 4 is held in the manner of a press fit and in particular a magnetic flux conduction between the magnetically conductive housing shell 32 and the flux-conducting partner 40 'enclosing it in the form of the (static) rocker arm axis. In addition, Fig. 4, as far as slightly different from the schematic diagram of Fig. 4 varies, nor a two-piece plunger 12, 12 ', in which a first, the assembly 12 in Fig. 2 equivalent

Plunger section of the armature unit in a ansitzenden second (and approximately at an end-side engaging portion 10 for cooperation with an external control partner in terms of material properties - such as hardness - optimized) section 12 'passes. Also, a transition between the housing shell 32 and a guidance of the plunger, in particular in the region of the portion 12 ', causing housing

End section and housing end stop 38 slightly different, without this being significant to the magnetic and

Operating characteristics.

This structural design, in particular in cooperation with the (thin) housing shell 32 and the magnetic flux conducting enclosing Flußleitpartner 40 (40 ') leads inventively advantageous that a total magnetic resistance of the magnetic yoke causing housing shell region decreases and a higher magnetic flux is enabled , again with advantageous effects on an achievable magnetic force of the illustrated actuator device and improved dynamic characteristics (such as switching speed), without the actual actuator device or the actuator housing 22 (namely, determined by a Outer diameter in the region of the shell 32) must grow in diameter, but here is the best possible compactness guaranteed.

This functionality according to the invention clarifies the juxtaposition of sub-figures 2 (a) and (b) with a flow distribution generated by simulation in a representation analogous to the embodiment of FIG. 4 (and axially limited to an upper half of the overall view of FIG. To simplify the illustration, equivalent components or components have been provided with reference numerals corresponding to FIGS. 1 and 4 respectively.

It first appears from the simulation illustration of FIG. 2 (a) with mechanically isolated and electrically controlled actuator device (ie without flux-conducting partner 40) that, due to increased magnetic resistance, in particular in the thin

Housing shell portion 32, a magnetic force decreases, as illustrated by the curve V01, which corresponds to Fig. 2 (a), in Fig. 3 is illustrated. It becomes clear that only at a minimum current of 0.6 A does the armature unit overcome the permanent magnetic attraction of the armature unit on the core unit 24 (positive force in FIG. 1 is the magnetic force of attraction) and then upon further increase in current, the armature unit retracts on the right (figure plane of FIG. 1) in the direction of the front-side housing end stop 38 can take place.

However, this motion and force curve is substantially flatter than the simulated in the drawing of Fig. 2 (b) mounting state of the actuator 22 in a Flussleitpartner, in which case the Flußleitpartner 40 ', with a circular arc contour, in the sectional view shown a pivot axis range of a combustion engine Rocker arm corresponds, in which, by a suitable, to a shell Outer diameter of the housing 22 adapted (and preferably designed to allow a press fit) bore of these flux-conducting 40 'is flux-conductively coupled. To this extent, this representation corresponds to the non-isolated state according to the invention, that is to say a magnetically flux-conducting interaction with a flux guide partner, which is in any case stationary at an assembly or installation location.

As can be seen from the representation of the simulated magnetic flux of FIG. 2 (b), in addition to the magnetic flux through the shell-side housing shell section 32, a significant flux contribution (partial magnetic flux) flows through this flux conducting partner 40 ', between one (in FIG On the left side shown) housing end and at least that housing portion, which in the region of the overlap with the permanent magnet disc 16 (together with adjacent flux guide disks 18, 20), so far as the air gap 34 is located.

An advantageous effect of this measure is the significant improvement in the current / force behavior of the magnetic conduction conductivity improved as described. It becomes clear, for example, that in the case of the energization of the circuit configured according to sub-figure 2 (b)

Actuator device according to characteristic V02 in Fig. 2 is already the armature movement causing (here in the graph negatively oriented) force contribution, while yes, as stated above, the same current (insofar according to the "predetermined working coil current" according to the invention) still causes no armature movement would have. Also, the further course of the force curve V02 shows that up to a nominal or maximum current of the current supply, here 1.5 A (in a typical actuator device according to simulation, which covers a stroke of 4.5 mm with respect to a total length of 50 mm, and where the Permanent magnet disk has a disk thickness in the range between 1 and 5 mm), which shows a significantly improved force behavior according to the invention cooperating with a Flußleitpartner device.

The present invention is not limited to the embodiment shown, and in particular, the bearing or axle region of an internal combustion engine rocker arm, which is used to implement the Flußleitpartners 40 'application, although preferred solution within a motor vehicle context, but not exhaustive and the invention limiting to understand. Rather, the present invention is suitable for interacting with a nearly arbitrarily ausgestalt- or selectable magnetically conductive or contributing to the electromagnetic flux line Flussleitpartner which contact the housing shell in a suitable manner and possibly also additionally optimized for a mechanical stop according to the invention in the diameter or. reduced actuator device can provide.

Claims

claims

1. Electromagnetic actuator device with

in an actuator housing (22) relative to stationary coil means (26) in response to energizing them in one

Axially movable anchor means (14),

have permanent magnet means (16) for repulsive interaction with at least partially enclosed by the coil means core means (24)

wherein the coil means and a between the anchoring means and the

Core means spanned anchor movement space is at least partially enclosed by a magnetically flow-conducting housing shell (32) of the actuator housing (22),

characterized in that

a cross-sectional area and / or wall thickness of the housing shell

(32) is set up and dimensioned in such a way that a magnetic flow resistance of the housing shell that is effective when energized with a predetermined working coil current does not enable the armature movement in a mechanically isolated operating state,

and that the housing shell so for cooperation with a shell side and / or radially outside attacking, separately and detachably provided or providable magnetic flux-conducting

Flux-conducting partner (40, 40 ') is formed,

in that the armature movement takes place in a non-insulated contact, connection and / or cooperative state of the housing shell with the flux conducting partner in a partial magnetic flux via the flux conducting partner during energization with the predetermined working coil current.

2. Apparatus according to claim 1, characterized in that the housing shell (32) is at least partially cylindrical and / or formed with a homogeneous and / or constant wall thickness.

3. Apparatus according to claim 1 or 2, characterized in that the cylindrical housing shell for preferably releasable insertion into a recess adapted to the housing shell diameter or an opening of the Flußleitpartners (40, 40 ') is formed.

4. Device according to one of claims 1 to 3, characterized in that the Flußleitpartner is formed as an assembly of an internal combustion engine, in particular as a rocker arm, and the housing shell in a stationary region (40 ') of the assembly, in particular an intercept of the module designed as a rocker arm , is usable.

5. Device according to one of claims 1 to 4, characterized in that the actuator device for valve and / or camshaft adjustment of an internal combustion engine is formed and the anchor means on the permanent magnet means ansitzende ram means (10) for effecting the valve or camshaft adjustment. 6. Apparatus according to claim 5, characterized in that the

Actuator device is formed electroless bistable and in the region of the core means (24) in the axial direction opposite end and / or end portion of the actuator housing stop and / or guide means (38) are provided for the anchor means.

7. Device according to one of claims 1 to 6, characterized in that the axially magnetized permanent magnet means (16) axially at least one preferably disk-shaped Flußleitbaugruppe (18, 20) is assigned so that these radially edge a working air gap (34) of the anchor means spans to an inner surface of the housing shell.

8. Actuator system comprising the electromagnetic actuator device according to the preamble of patent claim 1, preferably according to claim 1, as well as a magnetically flux-conducting and preferably releasable receptacle of the housing shell formed Flussleitbaugruppe, especially metallic and stationary provided or providable Kraftfahrzeug- Flussleitbaugruppe, as Flussleitpartner.

9. actuator system according to claim 8, characterized in that the motor vehicle flux guide assembly is an actuatable for valve control of an internal combustion engine rocker arm, in the swivel axis area, the receptacle of the housing shell is realized.

10. Use of the electromagnetic actuator device according to one of claims 1 to 7 and / or the actuator system according to one of the claims 8 or 9 for the realization of a valve and / or camshaft adjustment of an internal combustion engine.