WO2017153190A1

WO2017153190A1 - Electromagnetic part for a hydraulic valve and hydraulic valve

Info

Publication number: WO2017153190A1
Application number: PCT/EP2017/054443
Authority: WO
Inventors: Eike WINZER
Original assignee: ECO Holding 1 GmbH
Priority date: 2016-03-09
Filing date: 2017-02-27
Publication date: 2017-09-14
Also published as: DE102016104307A1

Abstract

The invention relates to an electromagnetic part (14), having a magnetizable housing (16), which extends around a solenoid (22) at least at an outer periphery (50) at least in some regions, and having a pole tube (20), which is arranged within the solenoid (22) and in which an armature (26) is provided in an axially movable manner in an armature chamber (56). A sliding structure (40) is arranged between an inner surface (48) of the pole tube (20) and a radially outer surface (49) of the armature (26), which sliding structure (40) has a plurality of cut-outs (60), which are distributed in a planar manner on a surface (64) facing the armature (26). The invention further relates to a hydraulic valve (10), having an electromagnetic part (14) and a hydraulic part (12), wherein the electromagnetic part (14) has a sliding structure (40) having cut-outs (60) distributed in a planar manner.

Description

Electromagnet part for a hydraulic valve and hydraulic valve

Technical area

The invention relates to a solenoid part for a hydraulic valve, in particular a hydraulic transmission valve of a hydraulic fluid-carrying device, in particular the mechatronics of a hydraulic control of a transmission of a motor vehicle and a hydraulic valve.

State of the art

In order to nevertheless be fail-safe in the case of large gear oil change intervals, in extreme cases with so-called lifetime fillings, the gear valve must have a high degree of robustness. High robustness can indeed be achieved with a great play on the parts to be moved. However, this is at the expense of the control quality.

From DE 10 201 1 053 023 A1 a hydraulic valve is known, which has both a high robustness and a high control quality. The high degree of robustness is achieved by dirt particles in the operating medium can not get stuck to the transmission valve, since the anchor apply so high axial forces he can always tear himself away. The high control quality is achieved by means of a plurality of constructive measures, which in particular minimizes the transverse forces between the armature and a pole tube, in which the armature is movably arranged. Such a known constructive feature for reducing the transverse forces is there a very close running clearance between the armature and the pole tube. In order to achieve high magnetic forces, the aim is to achieve the thinnest possible separating layer, for example, instead of a sleeve or a thick coating. Such a very thin separation layer is usefully at a layer thickness of 10 μηι to 60 μηι.

DE 10 2006 055 796 A1 describes a pressure regulating valve, in which the bearing of an anchor part in a pole tube is represented by a thin foil which replaces a previously used coating. A designed as a glass fiber fabric film forms a support structure, which gives the friction-reducing acting PTFE or Teflon material the necessary mechanical stability. The thin film is produced as a mat-shaped glass fiber fabric on which PTFE is applied on both sides in a sintering process. The foil, which is provided with PTFE on both sides, is limp and can be rolled into a structure such as a sleeve. With such a preforming of a section of the film mat into a sleeve-shaped configuration, the film material, provided with PTFE on both sides, undergoes application-specific shaping. The thickness of the glass fiber fabric is selected in a range between 30 μιτι to 150 μιτι. With smaller thicknesses of the film material, the magnetic transverse force increases too much, with larger thicknesses, the magnetic efficiency suffers.

DISCLOSURE OF THE INVENTION An object of the invention is to provide a solenoid part for a hydraulic valve, in particular for a hydraulic transmission valve, which in the Hydraulic valve ensures the highest possible robustness with cost-effective design.

Another object of the invention is to provide a hydraulic valve, in particular a hydraulic transmission valve, which combines the highest possible robustness with cost-effective design.

The above objects are achieved with the features of the independent claims.

Favorable embodiments and advantages of the invention will become apparent from the further claims, the description and the drawings.

It is proposed an electromagnet part having a magnetizable housing, which encloses a magnetic coil at least on an outer circumference at least partially, as well as with a arranged inside the magnet coil pole tube, in which an armature is provided axially displaceably arranged in an armature space. In this case, a sliding structure is arranged between an inner surface of the pole tube and a radially outer surface of the armature, which sliding structure has a plurality of on a surface facing the armature surface distributed recesses.

The introduction of the sliding structure in the requirements adapted. possibly outwardly sealing and to be used as a guide sleeve of the pole tube can advantageously cause an increase in the robustness of the solenoid part and thus the complete hydraulic valve in which the solenoid part is used. The sliding structure can for example consist of a cylindrical plate, which has recesses through cuts, holes, etchings. Alternatively, it is also conceivable as a sliding structure calendered wire mesh or to use plastic fabric to achieve the most uniform thickness of the sliding structure.

Advantageously, the sliding structure can optimize the running properties of the armature in the pole tube by reducing the contact area due to a smaller number of support points between armature and sleeve than pole tube. Under favorable conditions can be done by a storage of the anchor in a uniform film of oil. The wear on the sleeve is reduced because the sliding structure seals the armature space to the hydraulic environment of the solenoid part. Thus, the hysteresis properties of the hydraulic valve can be improved. Conveniently, dirt particles present in the hydraulic fluid can be absorbed in the recesses distributed in the surface of the sliding structure, so that the dirt particles can have little effect on the travel of the armature in the sleeve.

The armature space of the solenoid part is filled with hydraulic fluid during use. This hydraulic fluid serves as a damping medium in the movement of the armature in the pole tube of the solenoid part. However, the hydraulic fluid can be interspersed with dirt particles of different sizes and degrees of hardness, which causes increased wear of the armature and pole tube, which can be embodied for example as a sheet metal sleeve. The dirt particles could even lead to jamming of the anchor in the pole tube. Damage to the sleeve of the pole tube could occur both due to the dirt particles and due to lateral forces. These damages could minimize the positive valve characteristics and could even result in complete failure of the hydraulic valve.

As a result of the electromagnet part according to the invention, it is achieved that contaminants which are introduced into the armature space by the hydraulic fluid or from the production of the electromagnet part can deposit in the cavities of the recesses of the sliding structure and no longer directly between sleeve and anchor remain. Therefore, these dirt particles no longer get between the friction partner armature and sleeve, or in the bearing of armature and sleeve. Due to the surface design, the sliding structure reduces the contact points between the armature and the sleeve. This, in turn, improves the friction and reduces hysteresis. This reduces the wear behavior of the solenoid part as well as the risk of failure of the hydraulic valve. The sliding structure can also act as a non-magnetic air gap of the solenoid part. According to an advantageous embodiment, the recesses may be formed as through the thickness of the sliding structure continuous openings. By forming the recesses as openings of the sliding structure, for example in a metal foil, more volume is available to receive dirt particles, which further improves the wear behavior of the solenoid part. Also, there are already prefabricated semi-finished products, for example as networks or fabric structures, which can be used inexpensively.

According to an advantageous embodiment, the sliding structure may be fabric-like. A fabric already has intrinsically due to the production existing recesses or openings, so that such a fabric can be used inexpensively for the production of a solenoid part. Also in a tissue recesses in different depth and expression already exist, which may favor the inclusion of different sized dirt particles.

According to an advantageous embodiment, the sliding structure can be formed like a net. Due to their structure, nets offer a high proportion of openings compared to their total area, which advantageously increases the absorption capacity for dirt particles. At the same time, networks are very stable and tear-resistant due to the linking of the individual strands so that networks can be used favorably as a sliding structure. According to an advantageous embodiment, the sliding structure may have an embossed surface. As a starting material for such a sliding structure may serve a solid film or a sheet in which embossing already in the production of the film or the sheet can be introduced into the surface in a favorable manner embossing in a suitable manner as recesses in the surface of the sliding structure can absorb any existing dirt particles. According to an advantageous embodiment, the sliding structure may be formed of a non-magnetizable material. The sliding structure can represent the air gap required in an electromagnet between pole tube and movable armature when the sliding structure comprises a non-magnetic material. Such a material may be for example normal steel sheet. Plastics are also very beneficial to use as a sliding structure, since they are usually non-conductive and non-magnetic. The air gap can advantageously have a precisely defined thickness due to the sliding structure, which allows the control behavior of the hydraulic valve to be represented favorably. According to an advantageous embodiment, the sliding structure may be formed hollow cylindrical. Since an armature of an electromagnetic member is usually made in a cylindrical shape which is slidably disposed in a tubular pole tube, it is expedient if the sliding structure is also mounted as a hollow cylinder as the inner lining of the pole tube between the outer radial surface of the armature and the pole tube. Thus, the sliding structure can be easily manufactured and assembled, which simplifies the construction of the solenoid part.

According to an advantageous embodiment, the sliding structure may have a closed bottom at one end face. The pole tube is formed in some embodiments of solenoid parts in a cup shape in which a Bottom, the hollow cylindrical pole tube terminates at one end face. Thus, a pot-shaped sliding structure can be arranged in the interior of the cup-shaped pole tube, wherein the sliding structure can be adapted in the case of the inner shape of the pot Polutopfes. In this case, a magnetic short circuit is expediently avoided. The bottom of the sliding structure can be attached to a hollow cylindrical sliding structure. Alternatively, however, it is also conceivable to manufacture the sliding structure with a base from a component, for example by deforming a plane sliding structure surface by deep drawing. It is also possible to produce a cup-shaped plastic part in an injection molding process as a sliding structure.

According to an advantageous embodiment, an inner side of the bottom may have an anti-adhesive structure, which faces at least one end face of the armature. The sliding structure can favorably have on the inside facing the front side of the armature a Antiklebstruktur as a spacer to avoid adhesive effects of the armature in the operation of the solenoid part. This Antiklebstruktur may be formed, for example, as nubs or as a ring on the inner surface of the bottom of the sliding structure. According to an advantageous embodiment, a thickness of the sliding structure of less than 5 μηπ, preferably less than 2 μηι, more preferably less than 0.5 μηπ, most preferably less than 0.1 μηι be. Such small thicknesses are favorable in order to keep the air gap between pole tube and armature low in order to minimize the magnetic losses through the air gap. Also, such a stable control behavior of the solenoid part can be achieved due to the uniform air gap.

According to a further aspect of the invention, a hydraulic valve, in particular a hydraulic transmission valve, is proposed, which comprises an electromagnet part with a magnetizable housing, which surrounds a magnet coil at least on an outer circumference at least in regions, and with a Inside the magnetic coil arranged pole tube, in which an armature is provided in an armature space disposed axially displaceably comprises. Further, the hydraulic valve comprises a hydraulic part with a hydraulic piston, which is guided axially displaceably in a valve sleeve, wherein the armature is provided for driving the hydraulic piston. In this case, a sliding structure is arranged between an inner surface of the pole tube and a radially outer surface of the armature, which sliding structure has a plurality of on a surface facing the armature surface distributed recesses. The introduction of the sliding structure between armature and pole tube can cause an increase in the robustness of the solenoid part and thus of the complete hydraulic valve in which the solenoid part is inserted. Advantageously, the sliding structure can optimize the running properties of the armature in the pole tube by reducing the contact area due to a smaller number of contact points between the armature and sleeve as a pole tube. Under favorable conditions can be done by a storage of the anchor in a uniform film of oil. The wear on the sleeve is reduced because the sliding structure seals the armature space to the hydraulic environment of the solenoid part. Thus, the hysteresis properties of the hydraulic valve can be improved. Conveniently, dirt particles present in the hydraulic fluid can be absorbed in the recesses which are distributed over the surface in the surface of the sliding structure, so that the dirt particles move the course of the run

The sliding structure can for example consist of a cylindrical plate, which has recesses through cuts, holes, etchings. Alternatively, it is also conceivable to use calendered wire mesh, a mesh or plastic mesh as the sliding structure.

According to an advantageous embodiment, the recesses may be formed as through the thickness of the sliding structure continuous openings and / or embossing. By forming the recesses as openings of the sliding structure, For example, in a metal foil, more volume is available to absorb dirt particles, which further improves the wear behavior of the solenoid part. Also, there are already prefabricated semi-finished products, for example as networks or fabric structures, which can be used inexpensively.

As a starting material for a sliding structure with embossed surface can serve a solid film or a sheet in which embossing already in the production of the film or the sheet can be introduced in a favorable way embossments in the surface, in a suitable manner as recesses in the surface the sliding structure can absorb any existing dirt particles.

Brief description of the drawings

Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown. The drawings, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

They show by way of example:

1 shows a longitudinal section through an electromagnetic part of a hydraulic valve according to an embodiment of the invention.

FIG. 2 is an enlarged view of a detail from FIG. 1 with focus on the sliding structure; FIG. a wire mesh as an embodiment of a sliding structure; a wire mesh with a smaller mesh size than another embodiment of a sliding structure; a plastic fabric as another embodiment of a sliding structure; an etched plate as another embodiment of a sliding structure; another etched sheet as another embodiment of a sliding structure; a sliding structure of a hollow cylinder formed as a perforated plate according to an embodiment of the invention; and a longitudinal section through an electromagnetic part of a hydraulic valve according to a further embodiment of the invention with a cup-shaped sliding structure.

Embodiments of the invention

In the figures, the same or similar components are numbered with the same reference numerals. The figures are merely examples and are not intended to be limiting.

1 shows a longitudinal section through an electromagnetic part 14 of a hydraulic valve 10 according to an embodiment of the invention, while Figure 2 is an enlarged view of a detail of Figure 1 with focus on the sliding structure 40 shows. The hydraulic valve 10, which may be in particular a hydraulic transmission valve, comprises the solenoid part 14 with the magnetizable housing 16 which surrounds the magnetic coil 22 on an outer circumference 50 in regions, and with the pole tube 20 arranged in the interior of the magnet coil 22, in which the armature 26 is provided axially displaceably arranged in the armature space 56. The magnetic coil 22 is enclosed with both end faces 52, 54 in the bobbin 24, which can be prepared for example by plastic extrusion of the magnetic coil 22. The pole tube 20 is formed as a cup-shaped closed at an end face 36 of the armature 26 sleeve. Furthermore, the hydraulic valve 10 includes the hydraulic part 12 with the hydraulic piston 30, which is guided axially displaceably in the valve sleeve 18. The hydraulic part 12 of the hydraulic valve 10 is shown only in approach with valve sleeve 18 and hydraulic piston 30. The armature 26 is provided for driving the hydraulic piston 30 and connected to the hydraulic piston via the pin 32. The pin 32 is disposed in an inner bore 58 of the armature 26, for example, pressed. At the hydraulic part 12 facing the front side of the armature 26 an anti-sticking disc 28 is arranged. In the rear armature space 57 a Antiklebstruktur 44 is arranged on the end face 36 of the armature 26. Alternatively, the Antiklebstruktur 44 also be part of the inside of the sleeve of the pole tube 20, for example in the form of characteristics, be.

Between the inner surface 48 of the pole tube 20 and the radially outer surface 49 of the armature 26, the sliding structure 40 is arranged, which sliding structure 40 has a plurality of on a side facing the armature 26 surface 64 recesses 60 distributed. The recesses 60 may be formed, for example, as through the thickness 62 of the sliding structure 40 continuous openings 66 and / or embossing 68 of the armature 26 facing surface of the sliding structure 40. The sliding structure 40 may be formed, for example, fabric-like or net-like from wire mesh, plastic fabric or etched sheets. Preferably, the sliding structure 40 may be formed of a non-magnetic material so as not to form a magnetic short circuit in the interior of the pole tube 20. Since the sliding structure 40 is arranged in the interior of the pole tube 20 and bears tightly against the surface 48 of the pole tube 20, it is expediently designed as a hollow cylinder.

The thickness 62 of the sliding structure 40, which is shown in Figure 2, may advantageously be less than 5 μηπ, preferably less than 2 μηι, more preferably less than 0.5 μηπ, and most preferably less than 0.1 μηι. With such a small thickness, a desired narrow air gap of the solenoid part is realized, which advantageously reduces small magnetic losses of the solenoid part.

In Figure 2 it can be seen that the sliding structure 40 evenly distributed over the surface of the sliding structure 40 openings 66 as recesses 60, which can accommodate low dirt particles of the hydraulic fluid by initial contamination of the hydraulic fluid and / or abrasion during operation.

FIGS. 3 to 5 show advantageous embodiments of semi-finished products. Which can be used advantageously for a sliding structure 40.

FIG. 3 shows a wire mesh as one embodiment of a sliding structure 40. The wire mesh has parallel wires and cross-connections of the wires stepped therebetween, thereby forming a plurality of large area openings 66.

Figure 4 shows a wire mesh with a smaller mesh size as another embodiment of a sliding structure. Also in this fabric wires are arranged in parallel, which are connected by transverse wires. This wire mesh has a smaller area proportion of the openings 66 compared to the total area. Figure 5 shows a plastic fabric as another embodiment of a sliding structure. Such a plastic fabric may be designed as a dense network, as shown in Figure 5. Alternatively, however, it can also be embodied by embossing the surface with recesses 60 as a stamping 68 or by using a tool as a finished injection-molded part.

FIG. 6 shows an etched sheet metal as a further exemplary embodiment of a sliding structure. In the case of an etched sheet it is possible to comply with tight tolerances with regard to the thickness of the sheet. It is also advantageously possible to adhere to the smoothest possible surface of the sliding structure, which favorably influences the running properties of the armature 26 on the surface of the sliding structure 40 and keeps the wear low. Alternatively, it is also conceivable to calender the semi-finished product of the sliding structure 40 in order to achieve the most uniform possible thickness of the sliding structure 40.

FIG. 7 shows an etched sheet with hexagonally shaped openings 66 as a further exemplary embodiment of a sliding structure 40. In this embodiment, the area fraction of the openings 66 on the total surface of the sliding structure 40 is greater than in the exemplary embodiment illustrated in FIG. As a result, contact points of the armature surface are reduced on the sliding structure 40, which can affect the running properties low. In addition, the capacity of the openings 66 for any dirt particles is relatively large.

FIG. 8 shows a sliding structure 40 made of a perforated plate shaped as a hollow cylinder according to an exemplary embodiment of the invention. Such a sliding structure 40 has, compared with the embodiments in FIGS. 6 and 7, a mean surface portion of the openings 66 on the total surface of the sliding structure on. The hollow cylinder can be advantageously applied to the inner surface of a pole tube.

9 shows a longitudinal section through an electromagnet part 14 of a hydraulic valve 10 according to a further embodiment of the invention with a cup-shaped sliding structure 40. The solenoid part 14, which corresponds in its other embodiment to the embodiment in Figure 1, has a sliding structure 40, which at the Front side 46 of the sliding structure 40 has a closed bottom 42. In order for the sliding structure 40 is adapted in shape of the cup-shaped sleeve of the pole tube 20 and can be used directly into the interior of the pole tube 20. In order to bond the armature 26 when the end face 36 of the armature 26 abuts against the sleeve of the pole tube 20, the inside 43 of the bottom 42 of the sliding structure 40 has an anti-adhesive structure 44 which faces the end face 36 of the armature 26. Alternatively, the Antiklebstruktur 44 could also be arranged on the inside of the sleeve of the pole tube 20, for example, as a survey.

The features described do not necessarily have to be combined and can also be used individually in a hydraulic valve.

Claims

claims

Electromagnet part (14) with a magnetizable housing (1 6), which surrounds a magnetic coil (22) at least on an outer circumference (50) at least partially, as well as with a inside the magnetic coil (22) arranged pole tube (20), in which an armature (26) is provided axially displaceably in an armature space (56),

wherein a sliding structure (40) is arranged between an inner surface (48) of the pole tube (20) and a radially outer surface (49) of the armature (26), said sliding structure (40) being arranged on a plurality of armatures (26). facing surface (64) distributed flat recesses (60).

An electromagnetic member according to claim 1, wherein said recesses (60) are formed as openings (66) through the thickness (62) of said sliding structure (40).

Electromagnet part according to claim 1 or 2, wherein the sliding structure (40) is formed like a fabric.

Electromagnet part according to claim 1 or 2, wherein the sliding structure (40) is formed net-like.

The solenoid part according to claim 1, wherein the sliding structure (40) has an embossed surface.

6. Electromagnet part according to one of the preceding claims, wherein the sliding structure (40) is formed of a non-magnetizable material.

7. Electromagnet part according to one of the preceding claims, wherein the sliding structure (40) is formed as a hollow cylinder.

8. The solenoid part according to claim 7, wherein the sliding structure (40) on a front side (46) has a closed bottom (42).

9. The solenoid part according to claim 8, wherein an inside (43) of the bottom (42) has an anti-corrosion structure (44) facing at least one end face (36) of the armature (26).

10. Electromagnet part according to one of the preceding claims, wherein a thickness (62) of the sliding structure (40) is less than 5 μηπ, preferably less than 2 μηπ, more preferably less than 0.5 μηπ, most preferably less than 0.1 μηι ,

1 1. Hydraulic valve (10), in particular a hydraulic transmission valve, comprising an electromagnet part (14) according to one of the preceding claims with a magnetizable housing (1 6), which at least partially surrounds a magnetic coil (22) at least on an outer circumference (50), and with a Inside the magnetic coil (22) arranged pole tube (20) in which an armature (26) in an armature space (56) is arranged axially displaceably,

a hydraulic part (12) with a hydraulic piston (30), which is guided axially displaceably in a valve bushing (18),

wherein the armature (26) is provided for driving the hydraulic piston (30),

wherein a sliding structure (40) is arranged between an inner surface (48) of the pole tube (20) and a radially outer surface (49) of the armature (26), said sliding structure (40) being arranged on a plurality of armatures (26). facing surface (64) distributed over a surface Recesses (60).

Hydraulic valve according to claim 1 1, wherein the recesses (60) as through the thickness (62) of the sliding structure (40) through openings (66) and / or embossments (68) are formed.