DE102019130969A1 - Bobbin with filter function, magnetic actuator and locking unit - Google Patents

Abstract

A coil body is proposed, designed to carry a winding (4) through which an electric current can flow and designed to at least partially surround an armature space (6), the coil body (2) defining a longitudinal axis (L), with at least one lead-through means, which is arranged on or in the coil body (2) in such a way that a fluid path can be guided through the lead-through means, the lead-through means being designed as a pressure relief filter means (8).

Description

The invention relates to a coil body according to the preamble of claim 1, a magnetic actuator according to the preamble of claim 9 and a locking unit according to claim 10.

Such bobbins are designed to carry a winding through which an electric current can flow and are designed to at least partially surround an armature space, the bobbin defining a longitudinal axis. A movable armature of a magnetic actuator can be arranged in an armature space.

Bobbins of this type can be part of a lifting magnet used in a mechanical device. The mechanical device can be, for example, a parking lock of a motor vehicle. By energizing the winding, an armature which can be displaced at least in sections within the coil body along the longitudinal axis can be adjusted. As a result of these and possibly other movements within the mechanical device, oil is drawn into the interior of the device and pressed out of it. There is therefore an exchange of oil between the interior of the device and the exterior of the device, with an oil sump usually being provided outside the device. For this exchange, relief openings and relief channels are provided in a device housing, through which an oil path is guided and which fluidically connect the device interior to the device exterior. These relief openings and relief channels usually have a complicated course or are arranged in locations that are difficult to access or are difficult to manufacture and can therefore only be manufactured at a very high cost.

An oil, for example an oil sump, which usually carries with it various types of contamination, such as, for example, metallic abrasion, can carry this contamination into the interior of the device via the oil path. There, the contamination can significantly disrupt the functionality of the lifting magnet and other components. Metallic contamination in particular has a noticeably negative effect in the magnetic field of the winding when the current is supplied accordingly.

The invention is therefore based on the object of creating a simply constructed bobbin for a lifting magnet which, as such, permanently and reliably prevents the entry of dirt into a device interior and allows a pressure-relieving oil path to be guided more easily from a structural point of view.

Main features of the invention are set out in claims 1, 9 and 10. Refinements are the subject of claims 2 to 8.

This object is achieved according to the invention by a bobbin, designed to carry a winding through which an electric current can flow and designed to at least partially surround an armature space, the bobbin defining a longitudinal axis, with at least one lead-through means being provided, which in such a way on or in the Coil body is arranged so that a fluid path can be passed through the lead-through means, the lead-through means being designed as a pressure relief filter means.

The pressure-relief filter means can be arranged in a pressure-relieving and / or dirt-guiding fluid path in such a way that a dirt-guiding fluid flows through or has to flow through the pressure-relief filter means. There are therefore no bypasses without pressure relief filter media. Depending on the pore size or the size of the passage openings of the pressure relief filter medium, those dirt particles of larger diameter, based on the passage openings, cannot pass through the pressure relief filter medium in the direction of flow. The pressure relief filter medium thus leads to a sieve effect. In the area behind the pressure relief filter means, viewed in the direction of flow, the fluid therefore has considerably less contamination than on the other side of the pressure relief filter means. The filtered fluid no longer restricts the functionality of a lifting magnet.

The pressure relief filter means can be designed, for example, in such a way that it forms a pressure relief channel at least in sections or forms a pressure relief channel in sections. As a result, the pressure-relieving fluid path can now be guided through the coil body, which avoids a previously complicated course of pressure relief channels, because the channel no longer has to run around the coil body.

“A” filter medium is an element with a filter function and a spatially limited filter surface. The bobbin can comprise a single or multiple pressure relief filter means.

The created pressure relief filter medium now fulfills a double function. On the one hand, it represents a pressure relief means which enables pressure relief by guiding the pressure-relieving fluid path. The pressure relief function is therefore integrated into the coil body and no longer has to be constructed in a complex manner in adjacent components. On the other hand, it is hiring Filter means which enables fluid-conveyed dirt to penetrate into a protected space, such as the interior of a device. The filter function is therefore also integrated in the coil body.

According to a preferred embodiment of the bobbin according to the invention, the pressure relief filter means can be a component that is separate from the bobbin. “Separate” means that each component has its own separate peripheral surface. The pressure relief filter means can be arranged on the coil body, but does not necessarily have to be in contact with it. In this case, “on” means in the area of influence or in the vicinity of the function. This design can be useful if, for example, due to a lack of installation space, the pressure relief filter means is arranged outside the coil body or at a distance from the coil body.

According to a further preferred embodiment of the bobbin according to the invention, it is conceivable that the pressure relief filter means is arranged in a recess of the bobbin, in particular on a flange section and / or on a winding section of the bobbin. As a result, the pressure relief filter means can be arranged on or in a region of the coil body without deviating from a proven coil body shape (flange sections on both sides of a winding section). The fluid path then also leads through the recess and the pressure relief filter means in the corresponding section of the coil body. The recess can have a function that conducts the fluid and can carry the fluid to or from the pressure relief filter means. The recess can also be a section of a channel, such as a pressure relief channel.

According to a further preferred embodiment of the coil former according to the invention, it is conceivable that the pressure relief filter means has a metal or plastic structure and / or is designed as a mesh or sieve. Depending on the desired application, a wide variety of pressure relief filter means can be provided. For example, a metal structure has a long service life with regard to metallic impurities. In addition, impurities in harder materials tend to tilt less often, which prevents clogging.

According to one embodiment of the bobbin according to the invention, the bobbin and the pressure relief filter means can, as an alternative or in addition to one of the preceding paragraphs, be designed either in one piece or monolithically with one another. The pressure relief filter means can thus be designed with the coil body either as a one-piece embodiment (for example clipped, glued, injected) or as a monolithic embodiment (made of one piece). In the one-piece design, the pressure relief filter means can be firmly connected to the coil body in a suitable manner. This leads to a bobbin that is easy to manufacture and enables a large number of possible variations between bobbin and pressure relief filter medium in order to manufacture bobbins for a wide variety of applications with lean production processes. The pressure relief filter means can be designed as a rigid component or as a fabric. With the monolithic design, a permanent and inseparable connection between the two elements can be created.

Alternatively or additionally, according to a preferred embodiment, the coil body and the pressure relief filter means can be designed as an injection molded part, preferably an injection molded part formed in an injection molding process. By means of injection molding, both a one-piece and a monolithic design can be implemented in a cost-effective manner. A subsequent connection of the pressure relief filter medium and the coil body can therefore no longer be necessary. This design also excludes loosening or detachment of the pressure relief filter medium from the coil body over its service life.

According to a further embodiment of the bobbin according to the invention, as an alternative or in addition to one of the preceding paragraphs, it is conceivable that the pressure relief filter means is arranged on a flange section and / or on a winding section of the bobbin. In this case, there is no need for a recess for the arrangement of the pressure relief filter means. The pressure relief filter means can terminate flush with at least one surface of the coil body in order to generate a harmonious surface which avoids turbulence of the fluid as far as possible.

According to one embodiment of the coil former according to the invention, the flange section and / or the winding section can comprise filter sections and filter-free wall sections as an alternative or in addition to one of the preceding paragraphs. Thus, the pressure relief filter means does not extend over the entire circumferential surface of the coil body, the filter-free wall sections enabling the fluid to be channeled through the filter sections. It is also conceivable that the coil body can thereby lead different fluid paths.

As an alternative or in addition to one of the preceding paragraphs, it is conceivable according to a further embodiment of the coil body according to the Invention that the pressure relief filter means extends along the longitudinal axis of the bobbin. This embodiment is particularly suitable for fluid paths which run parallel to the longitudinal axis at least in sections, since a large transfer area can be produced between an interior of the coil former and an exterior of the coil former. In this embodiment, the extent is greater in the longitudinal direction than in the circumferential direction. “Transfer area” means the area over which a fluid is transferred from one side of the pressure relief filter medium to the other of the pressure relief filter medium, based on the direction of flow.

As an alternative or in addition to one of the preceding paragraphs, provision can also be made for the pressure relief filter means to extend along the circumference of the coil former. This embodiment is particularly suitable for fluid paths that run at least in sections along the circumference. Here, too, a large transfer area can be produced between an interior of the coil former and an exterior of the coil former. In this embodiment, the extent is greater in the circumferential direction than in the longitudinal direction.

According to a further preferred embodiment of the coil former according to the invention, it is conceivable that the pressure relief filter means comprises web sections with passage openings arranged between them, which are cylindrical, biconical and / or conical in cross-section. Cylindrical cross-sections have an identical diameter over their entire height. Conical cross-sections are characterized by a continuous decrease in diameter. A plurality of cylinder sections of continuously increasing diameter, arranged one behind the other in the flow direction of a passage opening, are also conceivable. It is also conceivable that the opening of the passage opening facing the coil body exterior has a smaller diameter than the opening facing the coil body interior. In this way, the closure of the passage openings by dirt can be avoided. Biconical cross-sections with inlet diameters larger than a central diameter are particularly suitable for guiding the introduction and discharge of fluid into and out of the passage opening.

According to a preferred embodiment of the coil former according to the invention, it is conceivable that the passage openings have a maximum opening width of 0.5 mm and / or a minimum opening width of 0.1 mm. The maximum opening width can preferably be 0.3 mm. The minimum opening width can preferably be 0.17 mm. As a result, the entry of typical soiling, for example when used in a locking unit for the parking lock, can be reliably prevented via a fluid path into a space to be protected.

It can also be provided that the web sections or their central longitudinal axis have an orientation that is tilted by an angle with respect to a surface normal referenced in the arrangement area of the pressure relief filter means. In this way, passage openings can be formed which not only fulfill a filter function, but also a fluid-conducting and deflecting function. The direction of flow can therefore be tilted as desired with respect to the surface normal. As a result, directions of flow towards the pressure relief filter means and away from the pressure relief filter means can be influenced as far as possible in such a way that turbulence is avoided in order to achieve a high flow rate.

According to a further development, as an alternative or in addition to one of the preceding paragraphs, the size of the angle can correspond to half of an angle between the filter inlet and the filter outlet. The flow direction created in the passage opening thus represents an averaged balance between inlet and outlet. A connecting section between inlet and outlet is created that guides a fluid path as evenly as possible, the flow direction being able to reverse and therefore also the sides of inlet and outlet Swap the sequence.

As an alternative or in addition to one of the preceding paragraphs according to an embodiment of the coil former according to the invention, it is conceivable that several pressure relief filter means are arranged on the flange section and / or on the winding section in such a way that they are evenly spaced with respect to the longitudinal axis and / or are arranged diametrically opposite one another are. This allows the fluid to flow uniformly into and out of the coil body.

According to a further embodiment of the coil former according to the invention, as an alternative or in addition to one of the preceding paragraphs, the pressure relief filter means can exclusively have a simple filter coating in the direction of flow. A filter pad is defined as a pad with passage openings arranged next to one another. The use of only one pressure relief filter pad per pressure relief filter medium is an optimal compromise between filter function and flow resistance.

As an alternative or in addition to one of the preceding paragraphs, it can also be provided that the coil body is designed as a parking lock locking unit coil body. Just In this use, the advantages of the coil body according to the invention come into play, since the entry of dirt from an oil sump into the parking lock can usually lead to a defect in the parking lock and to considerable follow-up costs. The pressure relief filter means can be arranged, for example, in a fluid path between an oil sump outside the parking lock and an armature space or a parking lock interior, on the one hand to prevent the entry of dirt from the oil sump into the parking lock and on the other hand to enable pressure relief of the parking lock interior.

According to the invention, a magnetic actuator is also proposed, comprising a coil former according to the invention according to at least one of the preceding paragraphs. The magnetic actuator can be a lifting magnet, for example. The advantages described above with regard to the coil former result in the same way for the magnetic actuator, to which reference is hereby made.

A locking unit is also proposed, in particular for the parking lock of an automatic transmission, for locking the movement of a piston which can be moved by a drive, in particular can be pressurized, the locking unit comprising a coil body according to at least one of the preceding paragraphs. The advantages described above with regard to the bobbin result in the same way for the locking unit, to which reference is hereby made.

• 1 in einem vertikalen Schnitt ein erfindungsgemäßer Spulenträger in einem Hubmagneten einer Verriegelungseinheit;
• 2 einen vergrößerten Ausschnitt der Verriegelungseinheit nach 1;
• 3 in einer perspektivischen Ansicht der erfindungsgemäße Spulenträger in Alleinstellung;
• 4 in einer weiteren perspektivischen Ansicht der erfindungsgemäße Spulenträger in Alleinstellung;
• 5 in einer schematischen Draufsicht die Durchlassöffnungen des Druckentlastungs-Filtermittels;
• 6 in einer schematischen Schnittansicht eine erste Ausführungsform einer Durchlassöffnung des Druckentlastungs-Filtermittels;
• 7 in einer schematischen Schnittansicht eine zweite Ausführungsform einer Durchlassöffnung des Druckentlastungs-Filtermittels;
• 8 in einer schematischen Schnittansicht eine dritte Ausführungsform einer Durchlassöffnung des Druckentlastungs-Filtermittels und
• 9 in einer schematischen Schnittansicht eine vierte Ausführungsform einer Durchlassöffnung des Druckentlastungs-Filtermittels.

Further features, details and advantages of the invention emerge from the wording of the claims and from the following description of exemplary embodiments with reference to the drawings. Show it:

• 1 in a vertical section a coil carrier according to the invention in a lifting magnet of a locking unit;
• 2 an enlarged section of the locking unit 1 ;
• 3 in a perspective view of the coil carrier according to the invention in isolation;
• 4th in a further perspective view of the coil carrier according to the invention in isolation;
• 5 in a schematic plan view, the passage openings of the pressure relief filter means;
• 6th in a schematic sectional view a first embodiment of a passage opening of the pressure relief filter means;
• 7th in a schematic sectional view a second embodiment of a passage opening of the pressure relief filter means;
• 8th in a schematic sectional view a third embodiment of a passage opening of the pressure relief filter means and
• 9 in a schematic sectional view a fourth embodiment of a passage opening of the pressure relief filter means.

1 shows a locking unit 24 for a parking lock of an automatic transmission of a motor vehicle. The locking unit 24 has a housing 26th , at the front end of the housing 28 an opening 30th is provided from a front end 32 of a piston 34 protrudes.

At that of the opening 30th opposite end of the housing 36 closes in the axial direction on the housing 26th an electromagnet 38 as a magnetic actuator. In the case 26th is the piston 34 in the axial direction, in particular along a longitudinal axis L. , movably mounted. For the movement of the piston 34 a drive is provided, in particular the piston 34 can be acted upon with pressure, preferably with hydraulic pressure, the force component of this pressure against the direction of force of a piston spring 40 is directed. The piston spring is supported here 40 on the one hand at one at the end of the housing 28 housing section adjoining on the inside 42 of the housing 26th from. On the other hand, the piston spring is supported 40 on a flange ring 44 of the piston 34 from.

The piston 34 moves between several positions due to the pressure; in the variant shown here, for example, two defined positions are provided. The location of the piston 34 is in the respective positions by a locking unit 46 that with locking elements 48 is equipped, can be determined. For actuating the locking unit 46 , especially for their locking elements 48 , is used by the electromagnet 38 or serve its elements.

The electromagnet 38 has a bobbin 2 who made a winding 4th carries and is designed as a parking lock unit spool. This winding 4th has a wire through which an electric current can flow. The winding 4th becomes radially outward, based on the longitudinal axis L. , from a magnet housing 50 completed. By energizing the winding 4th a magnetic field is created in a known way. Inside the bobbin 2 is an anchor room 6th provided, the anchor space 6th in the present case approximately half of the interior of the coil former 2 fills out. The anchor room 6th is in the direction of the piston 34 oriented. The remaining area of the interior of the bobbin 2 is from a magnetic core 52 filled out, which, as usual, consists of soft magnetic material, which guides the magnetic field lines well. In the anchor room 6th is an anchor 54 arranged displaceably, which in the embodiment shown here is cylindrical and has a bottom surface 56 having. Between the floor area 56 and one to the anchor room 6th facing end surface 58 of the magnetic core 52 a gap forms 60 variable width.

When the winding 4th is not energized, pushes a spring 62 , arranged in a spring chamber 68 , the anchor 54 to the right so that the gap 60 has its maximum extent. Will the winding 4th when energized, it generates a magnetic field, which the armature 54 against the force of the spring 62 to the left into the anchor room 6th pulls into it so that the gap 60 is reduced in size or even closed.

The anchor 54 carries an anchor rod 64 . The anchor rod 64 is concentric to the anchor 54 oriented. anchor 54 and anchor rod 64 are in the axial direction, i.e. parallel to the longitudinal axis L. , in the anchor room 6th movably mounted. "Axial direction" means the longitudinal axis L. of the bobbin 2 .

The anchor room 6th is on one side of the magnetic core 52 limited, the magnetic core 52 that of the piston 34 remote part of the interior of the bobbin 2 fills out. The magnetic core 52 also forms the axial end of the electromagnet 38 and also the locking unit 24 together with the magnet housing 50 . On the other side of the gap 60 , the piston 34 facing is the anchor room 6th limited by a yoke part 66 , which is at least partially designed like a pot and is preferably made of soft magnetic material in order to guide the magnetic field lines well. Part of the anchor dips in the process 54 optionally in the pot-shaped yoke part 66 a.

The yoke part 66 is part of the locking unit 46 and has a penetration hole 70 who have favourited the anchor rod 64 absorbs and, if necessary, also slidably stores. The locking unit 46 is, seen in section, essentially H-shaped. The radially oriented web of the H forms the yoke part 66 . This is followed by a first axial section 72 and a second axial section 74 at. The two axial sections adjoining here on both sides of the web 72 , 74 des H are of different lengths, with the anchor space 6th facing section 74 axially is significantly shorter than that of the piston 34 facing section 72 . The larger section 72 is in the present case or in typical designs approx. 2 to 3, 3.5 or 4 times longer than the smaller section 74 .

The two sections 72 , 74 each radially close off a corresponding receiving space. The shorter second section delimits it 74 the anchor room 6th (this is the pot-like yoke part 66 ) and the larger section 72 the spring room 68 . The spring space extends here 68 in the axial direction. In the pen room 68 is also the pen 62 provided on the one hand on the second section 74 facing top of the yoke part 66 and on the other hand on a control 76 , which end on the anchor rod 64 is arranged, supports. The control 76 is fixed in position on the anchor rod 64 arranged.

The control 76 has a mounting hole 401 into which the anchor rod 64 is used. The control 76 is in a suitable manner with the anchor rod 64 pressed and held on this in the exact position. The control 76 essentially comprises two different geometric bodies, namely a cylinder section and a conical section, the conical section having a conical surface on its lateral surface 400 trains. A jacket surface 403 of the cylinder section of the control element 76 is on one of the pen space 68 radially delimiting interior wall 402 guided, possibly also stored. On the electromagnet 38 facing axial end of the control element 76 there is an annular recess 404 into which the end of the spring 62 stands in and is thus reliably guided and held. The cone surface 400 is located on that of the recess 404 opposite end of the control 76 .

In the 1 The embodiment shown is designed so that when the electromagnet is de-energized 38 , i.e. with de-energized winding 4th , the control 76 the latching elements, which are in the form of balls here 48 pushes radially outwards and so the longitudinal adjustment of the piston 34 blocked. A blockage in the movement of the piston 34 but can also when the electromagnet is energized 38 respectively.

The location of the gap 60 is also variable according to the proposal. In the in 1 The embodiment shown is the gap 60 on that of the locking unit 46 facing away from the anchor 54 , so between anchors 54 and the magnetic core 52 . Alternatively, it is also possible that the gap 60 then between the anchor 54 and the yoke part 66 , i.e. that of the locking unit 46 facing side of the anchor 54 is trained.

When the winding is energized 4th the gap closes 60 by the anchor 54 is offset to the left in the plane of the picture, which also causes the anchor rod 64 and that from the anchor rod 64 worn control 76 be offset to the left, causing the magnetic spring 62 is compressed and thus an energy store for a return movement of the unit “armature 54 - anchor rod 64 - control 76 “When switching off the current supply to the winding 4th forms.

The larger first section 72 the locking unit 46 carries on its the yoke part 66 remote end the one or more locking elements 48 . Here is the larger section 72 at least in its end region sleeve-like or cylinder-like. The locking elements 48 are provided as balls in a ball cage. The sleeve-like or cylinder-like end region of the section 72 has radial, based on the longitudinal axis L. , oriented holes 78 to accommodate the locking elements 48 or balls. Depending on the axial position of the control element 76 it is possible that the locking elements 48 radially inwards into the holes 78 can evade or not.

Inside the case 26th is an interior 200 formed, which can be understood as the housing interior and is usually filled or can be filled with a fluid, usually with oil. The interior 200 can also have a spherical space for the locking elements 48 or comprise or form spheres. The oil can get into the interior 200 via a pressure connection 202 arrive and also flow out of this again. The adjusting movement of the piston 34 and the other moving parts within the housing 26th lead to the oil in the interior due to a resulting negative pressure 200 pulled in and by a resulting overpressure from the interior 200 is squeezed out. With the interior 200 is a pressure relief port 204 in the magnet housing 50 fluidically via an outside space 84 and an equalization opening 82 connected, shown by fluid arrow 206 . The pressure relief opening 204 can also alternatively or additionally in the housing 26th be trained. The course of the fluid arrow 206 is in 2 shown enlarged. It can also be seen there that the coil body 2 over its peripheral surface of the outer wall 212 of the one flange section 10a on the inner surface of the magnet housing 50 is applied.

As the 3 and 4th clarify in more detail, the in 1 and 2 shown bobbins 2 a base body comprising a winding section 10b which the winding 4th carries, and two flange portion 10a which each is the winding 4th limit axially, each one of the flange sections 10a in an axial end region of the winding section 10b is arranged.

On one of the two flange sections 10a is a dome element 208 arranged, which for receiving the two contacts of the winding, not shown 4th serves. This flange section 10a comprises a radially extending inner wall 210 , which is coaxial with the longitudinal axis L. can run, and a radially extending outer wall 212 , which are also coaxial to the longitudinal axis L. can run. These two walls 210 and 212 form with a flange base 214 a flange space 216 from which im in the locking unit 24 installed state of the electromagnet-side end of a middle piece 218 can be completed. The middle piece 218 is by means of a seal 86 opposite the housing 26th fluid-tight sealed. The flange bottom 214 connects the two walls 210 and 212 together. A fluid connection with the flange space 216 on the one hand forms the compensation opening 82 and on the other hand, the pressure relief opening 204 .

In the outer wall 212 is a recess 220 formed, in which a lead-through is arranged through which the fluid arrow 206 visualized fluid path between the interior 200 and an exterior, for example an oil sump, not shown, is performed. The lead-through means is a pressure relief filter means 8th formed, the outer surface of which is opposite the peripheral surface of the outer wall 212 is set back. The pressure relief filter media 8th has a metal or plastic structure and is designed as a mesh or a sieve. It extends along the perimeter U of the bobbin 2 extends. The flange section 10a has filter sections 12th and filter-free wall sections 14th on. It can be seen that the pressure relief filter medium 8th in the direction of flow D. has only a simple filter pad. The direction of flow D. can reverse.

The pressure relief filter media 8th represents a pressure relief means, which a pressure relief of the interior 200 by guiding the pressure-relieving fluid path along 206. The pressure relief function is therefore in the bobbin 2 integrated. On the other hand, it provides the pressure relief filter medium 8th a filter means which prevents fluid-conveyed dirt from penetrating from the outside (eg oil sump) into the interior space to be protected 200 prevented. The filter function is therefore also in the bobbin 2 integrated.

At its wrapping section 10b shows the bobbin 2 winding notches 222 on which the winding up of a first layer of the winding 4th enable.

The 5 shows passage openings in a schematic plan view 18th of the pressure relief filter media 8th , which by means of web sections 16 are separated from each other. The web sections 16 are part of the outer wall 212 and / or formed therefrom. The passage openings 18th are elliptical in plan view, with adjacent rows of passage openings 18th are offset by half a passage opening length. The Passage openings 18th can, however, also be circular, for example in plan view.

6th forms a first embodiment of the passage opening in a schematic sectional view 18th of the pressure relief filter media 8th from. The passage opening 18th has a conical cross-section, which extends in the direction of the pressure relief opening 204 along the direction of flow D. rejuvenates. The passage opening 18th has a maximum opening width 20 at one end and a minimum opening width 22 at the other end.

7th shows a schematic sectional view of a second embodiment of the passage opening 18th of the pressure relief filter media 8th . This passage opening 18th has a biconical cross-section and has a maximum opening width 20 at one end and along the direction of flow in its central region D. a minimum opening width 22.

8th shows a third embodiment of the passage opening in a schematic sectional view 18th of the pressure relief filter media 8th , this passage opening 18th also has a biconical cross-section. The bridges 16 are therefore eye-shaped or elliptical in cross-section. In addition, the web sections 16 or their central longitudinal axes M. one with respect to one in the area of arrangement of the pressure relief filter means 8th referenced surface normals F. at an angle α tilted alignment. Several adjacent bars 16 form a plane on which the surface normals F. stands vertically.

9 shows a fourth embodiment of the passage opening in a schematic sectional view 18th of the pressure relief filter media 8th , which is a variant of 8th acts. The passage openings 18th are cylindrical or trapezoidal. Here, too, are the web sections 16 or their central longitudinal axes M. with respect to the area in which the pressure relief filter means is arranged 8th referenced surface normals F. at an angle α aligned tilted, but corresponds to the size of the angle α half from an angle β between the flow direction along the filter inlet Z and the direction of flow along the filter drain A. . So the fluid flows in the direction Z on the pressure relief filter media 8th to and towards A. from. Intake Z and expiration A. are defined by the respective direction of flow of the fluid. Depending on the direction of flow D. can filter inlet Z and filter drain A. also be swapped.

The invention is not restricted to one of the embodiments described above, but can be modified in many ways.

All of the features and advantages arising from the claims, the description and the drawing, including structural details, spatial arrangements and method steps, can be essential to the invention both individually and in a wide variety of combinations.

In the figures, elements that are the same or that correspond to one another are each designated by the same reference symbols and are therefore not described again unless expedient. The disclosures contained in the entire description can be applied mutatis mutandis to the same parts with the same reference symbols or the same component names. The position details chosen in the description, e.g. above, below, to the side, etc., refer to the figure immediately described and shown and are to be transferred accordingly to the new position in the event of a change in position. Furthermore, individual features or combinations of features from the different exemplary embodiments shown and described can also represent independent, inventive or inventive solutions.

List of reference symbols

2

Bobbin

4th

Winding

6th

Anchor room

8th

Pressure relief filter media

10a

Flange section

10b

Winding section

12th

Filter section

14th

Wall section

16

web

18th

Passage opening

24

Locking unit

26th

casing

28

Housing end

30th

opening

32

front end

34

piston

36

Housing end

38

Electromagnet

40

Piston spring

42

Housing heel

44

Flange ring

46

Locking unit

48

Locking element

50

Magnet housing

52

Magnetic core

54

anchor

56

Floor area

58

End face

60

gap

62

feather

64

Anchor rod

66

Yoke part

68

Spring room

70

Penetration hole

72

first axial section

74

second axial section

76

Control

78

drilling

82

Compensation opening

84

Outside space

86

poetry

200

inner space

202

Pressure connection

204

Pressure relief port

206

Fluid arrow

208

Dome element

210

Inner wall

212

Outer wall

214

Flange bottom

216

Flange space

218

Middle piece

220

Recess

222

Notches

400

Conical surface

401

Mounting hole

402

Interior wall

403

Outer surface

404

Recess

α

angle

β

angle

A.

Filter drain

D.

Flow direction

F.

Surface normals

L.

Longitudinal axis

M.

Central longitudinal axis

U

scope

Z

Filter inlet

Claims (10)

Coil body, designed to carry a winding (4) through which an electric current can flow and designed to at least partially surround an armature space (6), the coil body (2) defining a longitudinal axis (L), characterized by at least one lead-through means, which is designed in this way is arranged on or in the coil body (2) so that a fluid path can be guided through the lead-through means, the lead-through means being designed as a pressure relief filter means (8). Bobbin after Claim 1 , characterized in that the pressure relief filter means (8) is a component separate from the coil body (2). Bobbin according to one of the preceding claims, characterized in that the pressure relief filter means (8) are in a recess (220) of the bobbin (2), in particular on a flange section (10a) and / or on a winding section (10b) of the bobbin (2) ) is arranged. Bobbin according to one of the preceding claims, characterized in that the pressure relief filter means (8) has a metal or plastic structure and / or is designed as a mesh or sieve. Coil body according to one of the preceding claims, characterized in that the coil body (2) and the pressure relief filter means (8) are designed as an injection molded part, preferably an injection molded part formed in an injection molding process. Bobbin according to one of the preceding claims, characterized in that the pressure relief filter means (8) comprises web sections (16) with passage openings (18) arranged between them, which are cylindrical, biconical and / or conical in cross-section. Bobbin according to one of the preceding claims, characterized in that the passage openings (18) have a maximum opening width (20) of 0.5 mm and / or a minimum opening width (22) of 0.1 mm. Coil body according to one of the preceding claims, characterized in that the web sections (16) or their central longitudinal axis (M) have an orientation tilted by an angle (α) with respect to a surface normal (F) referenced in the arrangement area of the pressure relief filter means (8). Magnetic actuator, characterized by a coil body (2) according to one of the preceding claims. Locking unit, in particular for the parking lock of an automatic transmission, for locking the movement of a piston that can be moved by a drive, in particular can be pressurized, the locking unit (24) comprising a coil body (2) according to one of the preceding claims.

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