DE102015107039B4 - Solenoid valve and safety-relevant pneumatic system - Google Patents

Abstract

Solenoid valve with an armature which can be adjusted axially within an inner channel (4) of a coil support (1) carrying the winding (2) on a winding section relative to the coil support (1), a core (7) and a valve seat (20) by energizing an electrical winding (6), wherein a guide channel (8) is formed in the armature (6) into which a guide component (13) fixed to the core (7) protrudes axially for guiding the armature (6) during its axial adjustment movement, characterized in that, that the armature (6) is designed and arranged to interact with the valve seat (20) via a sealing element (18), and that in addition to the sealing element (18), a stroke end position damping element (22) for interacting with the core (7) in the position of the valve seat ( 20) shifted away switching position is provided or that the sealing element (18) is the only stroke end position damping element (22).

Description

The invention relates to an electromagnetic valve, in particular for safety-relevant pneumatic systems in motor vehicles, according to the preamble of claim 1, with a coil carrier, which is adjustable by energizing an electrical winding axially within an inner channel of a coil carrier carrying the winding on a winding section, relative to the coil carrier, a core and a valve seat Anchor. The invention also relates to a safety-relevant pneumatic system, in particular a pneumatic brake system for motor vehicle applications, in particular for commercial vehicle applications, preferably an ABS or EBS system according to claim 16.

From the DE 93 000 39 U1 an electromagnetic valve is known, the adjustable armature of which is guided on the inner circumference of a coil support during its axial adjustment movement. The DE 41 39 670 C2 shows an alternative solenoid valve in which such an armature guide is also implemented. In addition, the document shows the one-piece design of the valve seat with the coil carrier. The disadvantage of the known electromagnetic valve, however, is the necessarily massive armature, which causes high weight and high manufacturing costs. The damping with respect to the core is also implemented in a complex manner using a spring pin placed in the armature. The sealing function with respect to the valve seat is achieved via a sealing element which is axially spaced from the spring pin.

The above designs of electromagnetic valves have not become established for safety-relevant applications, for example for ABS or EBS brake valves in commercial vehicle compressed air brakes, since their functionality is not guaranteed under all operating conditions. In extreme cases, for example, unwanted overcurrent can lead to overheating of the winding (coil), as a result of which the coil carrier reduces its inner diameter, which in the known embodiments defines the guide clearance to the armature, which entails the risk of armature jamming. This is due to the fact that the winding, which is applied with a corresponding winding tension, is responsible for the fact that the plastic of the coil carrier does not expand outwards or only to a small extent when heated, but is forced radially inwards, which to leads to the aforementioned problematic reduction in the inside diameter of the bobbin.

From the DE 10 2005 039 640 A1 an electromagnetic valve for pneumatic systems in motor vehicles is known, which has an armature which can be adjusted relative to a core and relative to a first valve seat by energizing an electrical winding within an inner channel of a coil former carrying the winding.

In the DE 10 2011 052 526 A1 the applicant is in 3 an electromagnetic valve device is shown in which axially into the armature guided exclusively on its outer circumference with a comparatively large radial play, non-elastomeric spacer means protrude in order to interact with an elastomeric sealing element for stop damping.

From the DE 102 48 125 A1 an electromagnetic adjusting device is also described in which an armature is connected to a sliding bushing and is guided on a mandrel inside without lubrication, the mandrel being fastened in a centered manner in a core of the adjusting device. As a result, transverse forces and frictional forces can be minimized and thus the service life can be increased and at the same time the size of the armature and, as a result, the size of the entire adjusting device can be reduced.

The US 2012/0 326 067 A1 further teaches an electromagnetic valve with an electromagnetic circuit that includes a coil wound on a bobbin, a core, a magnetic retractor, a valve closing member, a guide pin, and an armature that is substantially hollow. The armature is mounted so that it is movable with an inward facing surface on the guide pin. The armature acts at least indirectly on the valve closing element. The guide pin consists of a surface. The surface is arranged so that it points radially outwards so that it forms a first part directed towards the core and a second part directed towards the armature. The first part is configured so that it can be magnetized. The second part is configured so that it is not magnetized. A control edge is formed between the first part and the second part.

The further prior art dealing with electrovalves is the DE 10 2008 042 731 A1 , the US 2010/0252761 A1 , the DE 10 2008 060 483 A1 , the DE 10 2006 055 833 A1 , the DE 10 2004 001 565 A1 , the DE 102 53 769 A1 and the U.S. 4,341,241 A called.

On the basis of the aforementioned prior art, the invention is therefore based on the object of specifying an electromagnetic valve with an armature that can be adjusted to limit the axial length within an inner channel of a coil carrier, in which the risk of armature jamming is minimized, in particular around the electromagnetic valve for safety-relevant pneumatic systems Motor vehicles, especially in To be able to use commercial vehicles. Furthermore, the task consists in specifying a safety-relevant pneumatic system, in particular a braking system with at least one such electromagnetic valve.

This object is achieved with regard to the solenoid valve with the features of claim 1, i. in a generic solenoid valve in that a guide channel is formed in the armature, into which a guide component fixed to the core for guiding the armature during its axial adjustment movement protrudes axially. With regard to the safety-relevant pneumatic system, the object is achieved with the features of claim 16.

Advantageous further developments of the invention are specified in the subclaims. All combinations of at least two of the features disclosed in the description, the claims and / or the figures fall within the scope of the invention.

The invention is based on the idea of not guiding the armature, or at least not exclusively as in the prior art, on its outer circumference, or at least not exclusively, as in the prior art, on its outer circumference, in order to avoid armature clamps and at least partially receiving the armature, which is preferably designed as a stub sleeve or sleeve, within an inner channel of the coil carrier instead to realize an internal anchor guide, namely via a guide component fixed to the core, preferably directly contacting the core or directly connected to the core, on the outer circumference of which the armature is guided with an inner circumference having a guide diameter (the guide channel). As stated, the guide component to ensure good axial parallelism is fixed to the core, which is preferably received in sections in the inner channel of the coil carrier (winding carrier), and extends axially within a winding section of the coil carrier that carries the winding, the guide component preferably penetrating axially through the coil carrier. In other words, according to the invention, a guide channel (guide opening) is formed within the armature, the inner circumference of which limits a guide play with the outer circumference of a guide component fixed on the core, in particular as will be explained later, pressed into a core recess, around the armature by means of the guide component To guide the inner circumference, either in addition to a guide of the armature on its outer circumference or, alternatively, preferably without additional armature outer guide, ie exclusively by means of the guide component. In other words, it is particularly preferred if the armature is guided exclusively on its inner circumference over the guide component which guides the armature with a guide section located radially inside the winding section of the coil carrier. This makes it possible to enlarge the radial gap (air gap) between the outer armature diameter and the inner channel diameter, so that even if the inner channel diameter is reduced, there is no risk of an armature jamming as a result of overheating. The guide channel itself is sufficiently radially spaced from the critical hot area of the winding, in particular also spaced above the armature itself, so that a possible temperature-related expansion of the outer diameter of the guide component is comparatively small, with the result that the guide play between the outside diameter of the guide component and the inner circumference of the armature can be designed much smaller. This in turn has an advantageous effect on the tribological wear and thus guarantees the service life of the solenoid valve designed according to the concept of the invention while at the same time minimizing the risk of anchor clamps, which makes it ideal for use in safety-relevant automotive pneumatic systems.

In contrast to an alternatively realizable configuration in which an armature guide is formed in one piece with the coil carrier, the solution according to the invention, in which the coil carrier and guide component are designed as separate or independent components, has the advantage that the components are material-optimized with regard to their respective function can and do not necessarily have to be made of the same material. For example, as will be explained later, the coil carrier material can contain glass fiber admixtures to meet the corresponding strength requirements, while the guide component does not contain any glass fiber admixture or preferably at least a lower percentage by weight of glass fibers than the coil carrier material in order to prevent or at least minimize the effect that Glass fibers protruding at the edge have a negative effect on the friction behavior between the anchor and the guide dome. In particular with a high proportion of glass fiber by weight, an abrasive effect in the guide area between the armature and the guide component can be expected, which can have a negative effect on the amount of leakage over the running time. In general, the inventive, separate design of coil carrier and guide component, the guide component material can be optimized with regard to improved tribological and the lowest possible abrasive properties, while the coil carrier material can be optimized in particular with regard to increased strength requirements. A corresponding material optimization for the formation of the guide component in a further development of the invention can also advantageously be based on a An anchor coating that minimizes friction, in particular a PTFE coating, can be dispensed with.

Due to the fixed positioning of the guide component on, in particular in the core, and a preferably simultaneous fixed fixation of the core to a housing that surrounds the coil carrier and is firmly positioned relative to it, as well as the preferably section-wise accommodation of the core in the coil carrier inner channel, a sufficiently good axis parallelism between the coil carrier, guide component and anchors are implemented, in particular in a particularly preferred embodiment to be explained later, in which the guide component is pressed into a preferably central depression in the core, preferably designed as a blind hole opening.

It has been found to be advantageous if the guide component is designed rod-shaped at least in a guide section received in the guide channel (guide opening) of the armature, in particular with a circular cylindrical rod-shaped contour. It is particularly expedient, in particular with a view to fixing the guide component in a core recess, to be explained later, by pressing in, it is preferred if the guide component as a whole, i.e. is formed axially continuously rod-shaped, particularly preferably in the form of a cylinder having a circular base area.

As already explained above, the guide component and the coil carrier can be designed from different materials to meet different requirements. For the preferred case where the coil carrier is made of plastic, in particular by making a plastic injection-molded part, it is advantageous if it is a glass fiber reinforced plastic. For the preferred case that the guide component is also to be made of plastic, it is advantageous if the material used here does not contain any admixture of glass fibers or at least a percentage by weight of glass fibers that is lower, preferably by at least 10%, than the plastic of the bobbin.

If the guide component is made from plastic, it is preferred if the guide component material is admixed with friction-minimizing admixtures, in particular PTFE. It is also possible - regardless of the specific design of the coil carrier - to design the guide component from metal, in particular from a brass alloy. The metal should be selected so that it does not conduct the magnetic flux occurring due to the function of an electromagnetic valve according to the invention, or at least conducts it poorly. By implementing a metal guide component, even more exact roundness requirements can be met.

With regard to the concrete implementation of the fixed connection between the guide component and the core, it is preferable to provide a recess in the core, preferably designed as a blind hole opening, even more preferably stepped, and to close the preferably rod-shaped guide component by pressing it into this recess on the core fix. In other words, a press fit is formed between the inner circumference of the aforementioned recess and a fixing portion of the guide component. Most preferably, the guide component is made exclusively by being pressed into the recess, i. E. by realizing a press fit on the core, wherein, as will be explained below, other (additional or alternative) fastening measures can be implemented in addition or as an alternative. In addition or as an alternative to realizing a press fit between the guide component and the core recess, a development of the invention provides for the guide component to be fixed to the core by gluing it to the core. It is also (additionally or alternatively) possible to fix the guide component on the core, i.e. to position firmly to this, in which the guide component is or is acted upon by spring force, in particular axially against the core, in particular with a preferably provided return spring for the armature, which acts on the armature axially away from the core. For this purpose, the guide component preferably has an annular shoulder on which the pressure spring, which is preferably used as a return spring, for pressing the guide component against the core, can be supported. The guide component is preferably supported axially on the core by means of this annular shoulder. The ring shoulder, d. H. the circumferential collar of the guide component, on which a corresponding spring is preferably supported, for this purpose preferably rests on an annular shoulder of a depression in the core which is then preferably designed as a stepped recess, in particular a stepped bore, or is axially supported there.

The fixing of the guide component by pressing into the recess or the spring force loading of the guide component against the core or the gluing of the guide component to the core, in particular within a recess of the core, can, as mentioned, be carried out individually, i.e. can be implemented without any of the other measures or in any combination.

It is particularly preferred if, in the event that an adhesive solution is implemented, the guide component is additionally received in a depression in the core, in which case a press fit does not necessarily have to be implemented. It is also preferred if the guide component for the case of Realization of the aforementioned spring solution protrudes into a recess in the core or is received therein in sections, whereby a press fit does not necessarily have to be provided here, but can be provided if necessary.

In the preferred case of forming the recess as a stepped recess, in a further development of the invention, a return spring can be received in sections in a widened recess section facing the armature, in order to apply spring force to the armature in the direction of the valve seat. In a rear recess section having a smaller diameter, a press fit with the guide component can then be implemented in a preferred manner. Preferably, the return spring also serves as a pressure spring for pressing the guide component against the core in order to fix the guide component in this way on the core, i.e. to position firmly to this. In such an embodiment, gluing and / or pressing with the core recess can also be provided.

The armature is preferably guided on the guide component over at least half of its armature axial extension. If necessary, the armature can be guided on its outer circumference on the coil support in addition to the implemented armature inner guide during an axial adjustment movement, preferably, at least in sections, more preferably completely axially outside the winding section.

It is particularly useful if the radial guide play between the outer circumference of the guide dome and the inner circumference of the armature is smaller than a radial play between the outer circumference of the armature and the pipe in order to obtain a valve that is optimized with regard to a minimized armature jamming tendency. The guide play (radial play) between the inner circumference of the armature and the outer circumference of the guide dome is preferred from a range of values between 0.01mm and 0.1mm (corresponds to a diameter difference between the inner diameter of the armature and the outer diameter of the guide dome between 0.02mm and 0.2mm ) chosen. A minimum gap width (radial play) between the outer circumference of the armature and the inner circumference of the pipe is preferably greater than the aforementioned radial play, preferably greater than 0.15 mm, even more preferably greater than 0.2 mm.

In principle, it is possible for the armature to interact directly with the valve seat - however, an embodiment in which the sealing function is implemented via a sealing element is particularly preferred, more preferably via an elastomer part, with the sealing element being attached to the armature in a form-fitting manner. in that the sealing element is held in an annular groove formed in the armature or a radial recess, in particular in the area of an axial armature end region facing the valve seat, in order to be able to interact axially with the valve seat. The valve seat is preferably located on an axial side of the core facing away from the core. An advantageous, further development, form-fitting connection between the sealing element and the anchor means that the otherwise customary adhesion promoters can be dispensed with. In particular, when the sealing element, preferably on the core side, simultaneously has the function of a stop damping, this ensures a minimization of switching noises as well as a minimization of wear by avoiding hard metal stops and thus increasing the service life. It is particularly preferred if the valve seat is formed on a valve seat section of the coil carrier that is formed in one piece with the coil carrier. Preferably, the valve seat is axially spaced, i. E. outside the winding section of the bobbin.

An embodiment is particularly preferred in which the sealing element, with its axial side facing the valve seat, interacts in a sealing manner with the valve seat in a corresponding switching position and with the guide component, in particular an axially free end of the preferably rod-shaped guide component, in another switching position adjusted in the direction of the core. In such an embodiment, which will be explained below, the sealing element has a double function.

Thus, the sealing element, especially if it is designed as an elastomer part, acts on both axial sides as, preferably the only end stop damping element made of an elastomer material, so that the complex spring pin construction shown in the prior art is dispensed with and also has a Sealing function for sealing the valve seat. This advantageous embodiment of the solenoid valve is particularly easy to implement when the guide component projects axially to radially inside the winding section into the armature, whereby the respective interaction surfaces for interaction with the valve seat and the core move closer together than in the prior art. This makes it structurally advantageous to realize the double function of a sealing element explained above.

If you wanted a one-piece seal and damping in the DE 41 39 670 C2 Realize known valve, this would only be extremely complex by means of elastomer vulcanization through the armature or assembly of a very long elastomer component in the armature. In this case the length of this would be in one piece Elastomer part are in the order of magnitude of the anchor length and, due to the typical elastomer expansion coefficient between about 130 and 185 × 10 ^-6 mm / K, typically show several tenths of a millimeter temperature expansion, especially in the typical temperature range for motor vehicles between about -40 ° C and 125 ° C plus self-heating . This expansion would have to be kept in the armature stroke, but a larger armature stroke design with the same closing force would require oversizing of the magnet with a larger iron and copper content in the flux circuit and thus, in addition to an increased space requirement, would lead to increased manufacturing costs.

It is particularly preferred if the axial extent of the sealing element then interacting with both the guide component and the opposite valve seat is significantly smaller than the axial extent of the armature. The axial extent of the sealing element is preferably less than 50%, even more preferably less than 40%, very particularly preferably less than 30% of the axial extent of the armature. The axial extent of the sealing element fulfilling a double function is very particularly preferably selected from a value range between approximately 10% and 30%, even more preferably between approximately 15% and 25% of the axial armature length. In the event that the sealing element has the double function described in detail above, a stroke end position damping element separate from the sealing element for interacting with the core and / or the guide component is preferably dispensed with. Alternatively, it is possible to provide a stroke end position damping element, preferably designed as an elastomer part, in particular on an area facing away from the sealing element, in particular the core-side end area of the armature, which particularly preferably interacts radially adjacent to the guide component directly with the core for the purposes of impact damping.

In order to ensure pressure equalization when the armature is axially adjusted relative to the guide component, it is preferred if an armature interior, which is delimited at one end by the sealing element fixed to the armature and at the other end by the guide component, conducts fluid with a fluid chamber radially adjacent to the valve seat and / or to connect a working connection of the elastomer solenoid valve. The pressure level of a working connection of the solenoid valve is preferably applied in this fluid space, while a supply connection pressure is preferably applied within the valve seat.

A further essential advantage of the electromagnetic valve according to the invention is that the armature is significantly reduced in weight compared to a solid material solution. In principle, it is possible to design the armature, which is sleeve-shaped or truncated-sleeve-shaped, at least in sections, as a turned part, with inexpensive production by sintering or cold extrusion, in any case as a molded component, being preferred. The resulting weight reduction is also beneficial for the magnetic design, i.a. the copper component of the winding is advantageous, since with the same vibration resistance a return spring, which is preferably provided, more preferably axially accommodated between core and armature, against whose spring force the armature can be axially adjusted when the winding is energized, can be designed to be weaker than with a comparable solid armature.

In a further development of the invention it is advantageously provided that the guide component extends axially far within the inner channel. It is particularly preferred if the guide component protrudes axially over at least a quarter of the axial extent of the winding or the winding section into the winding section, very particularly preferably over at least a third of the axial extent of the winding section, even more preferably, at least approximately half the axial extent of the winding section , so that a minimal overall axial length with good functionality and space-optimized attachment of the core, preferably within the coil carrier, is possible. An embodiment can also be implemented in which the guide component axially completely penetrates the winding section.

It is particularly expedient, as already indicated at the beginning, if the core is arranged at least in sections within the coil carrier in order to ensure good axial parallelism of the guide component fixed on the core. An embodiment is particularly preferred in which the core is sealed against the coil carrier in the radial direction, in particular via an annular seal provided on the outer circumference of the core and / or via an annular seal provided on the inner circumference of the coil carrier, in order to prevent compressed air from escaping in an axial direction Avoid area between coil carrier and core.

It is particularly useful if the working stroke of the armature is adjustable and / or adjusted by axially adjusting and then securing the core, in particular by caulking a core section axially protruding beyond the coil carrier with a metallic flux guiding plate that conducts the magnetic flux, preferably designed as a valve housing . In this way, an optimized energy efficiency of the electromagnetic drive can be realized. In addition, such an assembly can be easily controlled given the tolerances.

The valve designed according to the concept of the invention can preferably be designed as a valve, in particular a 2/2-way valve, which is closed when the winding is energized, in which case the restoring spring preferably acts on the armature in the direction of the core.

The invention also leads to a safety-relevant pneumatic system, in particular a (pneumatic) brake system for motor vehicle applications, preferably for commercial vehicle applications. The safety-relevant system is very particularly preferably an ABS or EBS brake system in which an electromagnetic valve designed according to the concept of the invention is used, which particularly preferably takes on the function of an ABS brake valve or an EBS brake valve. The robust construction principle makes it suitable for such safety-relevant electromagnetic valves in safety-relevant pneumatic systems. Independently of this, the valve designed according to the concept of the invention, preferably designed as a pneumatic valve, can also be used for other applications that are not necessarily vehicle-specific and / or safety-relevant.

Further advantages, features and details of the invention emerge from the following description of preferred exemplary embodiments and with reference to the drawings:

• 1: eine geschnittene Darstellung eines als im unbestromten Zustand geschlossenen 2/2-Wegeventils, und
• 2 eine geschnittene Darstellung eines als im unbestromten Zustand geschlossenen 2/2-Wegeventils in einer alternativen Ausführung mit axial gegen den Kern federkraftbeaufschlagtem Führungselement.

These show in:

• 1 : a sectional representation of a closed 2/2-way valve in the de-energized state, and
• 2 a sectional view of a 2/2-way valve closed in the de-energized state in an alternative embodiment with a guide element which is axially spring-loaded against the core.

In the figures, the same elements and elements with the same function are identified by the same reference symbols.

In 1 a design of a solenoid valve designed according to the concept of the invention is shown as a 2/2-way valve in an embodiment closed in the zero position. A coil carrier made of plastic can be seen 1 , which has an energizable winding in an axial winding section 2 wearing. The energization of the winding 2 takes place via a contact pin 3 . The coil carrier 1 is preferably designed as a plastic injection molded part from a plastic material with glass fiber admixture.

Inside the bobbin 1 is an inner channel limited by this and implemented as a through channel 4th with an inner circumference 5 educated. Inside the inner channel 4th is a sleeve-shaped anchor 6th recorded with a guide channel 8th is provided on the one from the core 7th remote side is open. By energizing the winding 2 is the anchor 6th inside the inner channel 4th of the bobbin 1 axially adjustable, here in the plane of the drawing upwards towards the core 7th . To reset the anchor 6th when the winding is not energized 2 is a return spring 9 provided, which is at one end at the core 7th and the other end at anchor 6th supports.

It can be seen that the coil carrier 1 of a metallic housing that conducts the magnetic flux 10 is enclosed so that the magnetic flux is within the core 7th in the axial direction from the armature 6th away then radially outwards into the housing 10 , then again axially within the housing 10 on the winding 2 past down in the drawing plane and back inside the housing 10 can flow radially inward, via one of the coil support 1 and a radial gap 11 formed air gap in the armature 6th and in this in the axial direction to the core 7th , the magnetic flux doing one between armature 6th and core 7th formed air gap 12 must bridge. The case 10 at the same time has a yoke function.

For guiding the anchor 6th is a guide component made here, for example, as a plastic injection-molded part without glass fiber admixture or alternatively as a metal part, for example made of a brass alloy 13 provided on which a guide section 14th is trained.

The guide component 13 is with its guide section 14th axially in the guide channel 8th (Guide opening) of the anchor 6th guided in and protrudes over the winding section of the coil former in the direction of the valve seat. Between the guide component 13 , more precisely its guide section 14th and the inner circumference of the guide channel 8th is a leadership gap 15th formed, which is significantly smaller than the radial gap 11 between the inner circumference of the inner channel 4th and the outer circumference of the anchor 6th so that the anchor 6th exclusively on its inner circumference, but not on the inner circumference of the inner channel 4th is led.

Inside the core 7th is a stepped, towards anchor 6th open recess designed as a blind hole opening 16 introduced into which the axially continuous rod-shaped and circular cylinder-shaped contoured guide component in the exemplary embodiment 13 with an end fixing section 17th is pressed in. A corresponding interference fit is between the outer circumference of the fixing section and the inner circumference of the recess 16 , more accurate a reduced-diameter portion of the recess facing away from the valve seat 16 educated.

It can be seen that the spring 9 is received in a widened recess portion and is supported there axially on an annular shoulder. The return spring 9 is axially penetrated by the guide component 13 .

With de-energized winding 2 acts the anchor 6th , more precisely a form fit on the anchor 6th fixed, here elastomeric sealing element 18th , which in an inner circumferential groove 19th (Ring groove) in the anchor 6th is received or held in a form-fitting manner with a valve seat 20th together. In the direction of this first valve seat 20th becomes the anchor 6th by means of the return spring already mentioned 9 force applied. The valve seat 20th is on a valve seat section 21st formed in one piece with the coil carrier 1 is trained. In the valve seat section 21st there is also a supply channel 28 holding the valve seat 20th with a supply connection P fluidly connects.

At the core 7th According to the embodiment shown, the anchor can be equipped with an additional to the sealing element 18th provided stroke end position damping element 22nd axially support which of the guide member 13 is penetrated and which is also axially spaced from the sealing element in an inner circumferential groove of the armature 18th is fixed. However, an embodiment is preferred in which on the stroke end position damping element 22nd is dispensed with and instead the damping function with appropriate dimensioning adjustment, in particular lengthening of the guide component 13 , from the sealing element 18th is taken over, which in this respect with its from the valve seat 20th facing away from the axial face end stop damping with the free face of the guide component 13 can work together.

With the valve seat open 20th , ie when the winding is energized 2 can compressed air via a first fluid channel designed as a central channel, here the supply channel 28 in a region radially adjacent to the valve seat 20th flow and from there via a second fluid channel 26th axially back towards the working connection A. . It can be seen that an axially of the guide component 13 and the sealing element 18th and on the circumference of the anchor 6th limited anchor interior 27 via an axial channel 29 is fluidly connected to the area radially adjacent to the valve seat 20th , ie with the second fluid channel 26th or the supply connection A. , in order to thus with an adjustment of the armature relative to the guide component 13 the variable volume of the anchor interior 27 to be able to compensate with fluid, especially air.

Of course, flow can also flow through the solenoid valve in the opposite direction (then the connection designations change accordingly).

The supply connection is in the installation position P opposite the working connection A. via an O-ring seal 23 sealed axially on an annular shoulder 24 of the valve seat portion 21st supports. The supply connection is opposite the environment P sealed by another O-ring seal 25th which is supported axially on the system module.

The structure of the alternative embodiment of a solenoid valve according to 2 essentially corresponds to the structure 4th so that in order to avoid repetitions in the following essentially only the differences from the exemplary embodiment according to FIG 1 is received. With regard to the similarities, reference is made to the figure description above and to 1 referenced.

It can be seen that, in contrast to the exemplary embodiment according to FIG 2 the guide component 13 a ring shoulder 30th Has (collar or circumferential collar), on which the return spring is axially 9 supports, which thus the ring shoulder 30th and thus the guide component 13 against the core 7th axially spring-loaded and fixed in this way. If necessary, the spring force can be applied to the guide component 13 be the only axial attachment of the guide member to the core. If necessary, the guide component can also be glued 13 at the core 7th be realized and / or the realization of a press fit between the fixing section 17th and the core 7th .

It is also possible in the embodiment according to 1 to combine the implementation of a press fit with gluing or, alternatively, to dispense with the implementation of a press fit and to fix the guide component exclusively by gluing to the core, whereby it is generally preferred if the guide component is used in an adhesive solution and / or a contact force solution 13 is received in a, in particular designed as a blind hole recess in the core. A press fit can, but does not necessarily have to be implemented, since the actual fixation then preferably takes place with the aid of a suitable adhesive or by means of the pressure spring.

List of reference symbols

1

Bobbin

2

Winding

3

Contact pin

4th

Inner channel

5

Inner circumference

6th

anchor

7th

core

8th

Guide channel

9

Return spring

10

casing

11

Radial play

12

Air gap

13

Guide component

14th

Guide section

15th

Leadership gap

16

deepening

17th

Fixing section

18th

Sealing element

19th

Inner circumferential groove

20th

Valve seat

21st

Valve seat portion of the coil former

22nd

Stroke end position damping element

23

O-ring seal

24

Ring shoulder

25th

O-ring seal

26th

second fluid channel

27

Anchor interior

28

Supply channel

29

Axial channel

30th

Ring shoulder

A.

Working connection

P

Supply connection

Claims (16)

Solenoid valve with an armature which can be adjusted axially within an inner channel (4) of a coil support (1) carrying the winding (2) on a winding section relative to the coil support (1), a core (7) and a valve seat (20) by energizing an electrical winding (6), wherein a guide channel (8) is formed in the armature (6) into which a guide component (13) fixed to the core (7) protrudes axially for guiding the armature (6) during its axial adjustment movement, characterized in that, that the armature (6) is designed and arranged to interact with the valve seat (20) via a sealing element (18), and that in addition to the sealing element (18) a stroke end position damping element (22) for interacting with the core (7) in the area of the valve seat (20) shifted away switching position is provided or that the sealing element (18) is the only stroke end position damping element (22). Solenoid valve after Claim 1 , characterized in that the guide component (13) is received in sections in a recess (16) in the core (7), preferably designed as a blind hole opening. Solenoid valve after Claim 2 , characterized in that the guide component is pressed into the recess (16) and, preferably exclusively, is thereby fixed to the core (7). Electromagnetic valve according to one of the preceding claims, characterized in that the guide component (13) is fixed by gluing to the core (7) and / or that the guide component (13) is attached to the core (7) by spring force acting on the guide component (13) against the core ( 7) is set, in particular by means of a return spring (9) for the armature (6). Electromagnetic valve according to one of the preceding claims, characterized in that the guide component (13) is formed at least in a guide section (14) received in the guide channel (8) of the armature (6), preferably axially continuous, rod-shaped, preferably circular-cylindrical. Electromagnetic valve according to one of the preceding claims, characterized in that the coil carrier (1) consists of a material that is different, in particular mechanically stronger, than a material of the guide component (13). Electromagnetic valve according to one of the preceding claims, characterized in that the coil carrier (1) is made of a glass fiber reinforced plastic and the guide component (13) is made of a plastic without glass fiber admixture or at least with a, preferably at least 10%, lower weight percentage of glass fibers than the Plastic of the coil carrier (1), and / or that the material of the guide component (13), preferably in contrast to the material of the coil carrier (1), contains friction-minimizing additives, in particular PTFE, or that the guide component (13) is made of metal, in particular a brass alloy, and the coil carrier (1) is made of plastic. Electromagnetic valve according to one of the preceding claims, characterized in that the guide component (13) extends axially, in particular over at least a quarter, preferably at least the Half of the axial extent of the winding (2) extends within the winding section. Solenoid valve according to one of the preceding claims, characterized in that a radial guide play between the outer circumference of the guide component (13) and the inner circumference of the armature (6) is smaller than a radial play (11) between the outer circumference of the armature (6) and the inner circumference ( 5) of the inner channel (4). Electromagnetic valve according to one of the preceding claims, characterized in that the armature (6) is arranged via the sealing element (18), which is preferably designed as an elastomer part, with the armature (6), preferably on an axial side facing away from the core (7) Valve seat (20) is designed and arranged interacting. Solenoid valve according to one of the preceding claims, characterized in that the sealing element (18) is fixed positively to the armature (9), preferably in that it is held in an inner circumferential groove (19) of the armature (6). Solenoid valve according to one of the preceding claims, characterized in that the guide component (13) within the armature (6) together with the sealing element (18) delimits an armature interior (27) which is fluid-conducting with a fluid chamber radially adjacent to the valve seat (20) and / or a working connection (A) is connected. Solenoid valve according to one of the preceding claims, characterized in that the armature (6) is supported on the guide component (13) via the sealing element (18) in a switching position which is axially displaced away from the valve seat (20). Electromagnetic valve according to one of the preceding claims, characterized in that the stroke end position damping element (22), which is preferably fixed on the armature (6), is preferably axially penetrated by the guide component (13). Solenoid valve according to one of the preceding claims, characterized in that the valve seat (20) is arranged on a valve seat section (21) which is formed in one piece with the coil carrier (1). Safety-relevant pneumatic system for motor vehicle applications, with an electromagnetic valve designed as an ABS brake valve or EBS brake valve according to one of the preceding claims.

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