CN217421936U

CN217421936U - Electromagnetic hydraulic valve

Info

Publication number: CN217421936U
Application number: CN202220267198.XU
Authority: CN
Inventors: 托马斯·杰克布; 爱德华·克莱默尔
Original assignee: Eco Holding 1 GmbH
Current assignee: Eco Holding 1 GmbH
Priority date: 2021-02-09
Filing date: 2022-02-09
Publication date: 2022-09-13
Anticipated expiration: 2032-02-09
Also published as: CN217421937U; DE202022100569U1; DE202022100568U1

Abstract

The invention relates to an electromagnetic hydraulic valve, comprising an electromagnetic actuator with a magnetizable housing; the housing surrounds the electromagnetic coil on the outer circumference and on at least one end face; a pole cap arranged inside the housing, comprising a pole core and a pole tube, wherein the pole core and the pole tube are integrally connected over a connecting strip, wherein the connecting strip is connected with the pole core and/or the pole tube by a cone; an armature guided axially in the interior of the pole cap, the armature being supported in a membrane structure arranged in the interior of the pole cap, wherein the membrane structure extends at least partially over the pole core and the pole tube on the inner surface of the interior; a valve piston axially displaceable in the valve housing along the longitudinal axis by means of the actuator; the inner surface of the inner space has a plurality of relief grooves distributed at uniform distances at least in the region of the conical portion of the pole body, which serve to reduce the magnetic transverse forces.

Description

Electromagnetic hydraulic valve

Technical Field

The invention relates to an electromagnetic hydraulic valve comprising an electromagnetic actuator having a magnetizable housing, a pole cap arranged in the interior of the housing, an armature guided axially in the interior of the pole cap, and a valve piston which can be moved in the valve housing axially along the longitudinal axis by means of the actuator and which is used for opening and closing an interface of the valve housing.

Background

Hydraulic valves, in particular hydraulic valves used in automobile construction, such as cam phasers for camshafts or pressure control valves as hydraulic clutch controllers, are generally known.

In order to meet the high demands in terms of service life, the hydraulic valve must be of substantially robust construction. The greater space available on the part to be moved to achieve this robustness usually imposes a burden on the hydraulic valve to adjust the mass.

For example, in order to improve the quality of the adjustment, it is known to provide the bearing of the armature in the pole tube with a film or coating, wherein the film or coating is not magnetic, and thereby a magnetic separation can be provided between the armature and the pole tube.

For example, DE4343879a1 discloses that, in order to prevent magnetic sticking on the pole tube, the magnet armature is provided with a non-magnetic coating made of a chromium-nickel alloy or with a non-magnetic coating made of plastic.

Furthermore, DE10255740a1 discloses that the circumferential wall of the hollow space of the antipole tube is lined with a film of PTFE, which is designed as a sliding bearing for the armature.

Likewise, it is known, for example from DE102010061219a1, to provide a coated bushing between the pole cap and the armature.

SUMMERY OF THE UTILITY MODEL

The object of the present invention is therefore to provide an improved electromagnetic hydraulic valve which is constructed to be robust and which at the same time has a high regulating mass.

According to the utility model discloses, the task is through having and is given in the detailed description the utility model discloses the hydrovalve of characteristic is solved. Advantageous embodiments of the invention with the objective, unusual variants are specified in the description.

The electromagnetic hydraulic valve according to the invention comprises an electromagnetic actuator having a magnetizable housing which surrounds a magnet coil on the outer circumference and on at least one end face, and a pole cap which is arranged in the interior of the housing and which comprises a pole core and a pole tube in this order axially in the direction of the end face of the magnet coil, wherein the pole core and the pole tube are integrally connected by a connecting strip, wherein the connecting strip is connected to the pole core and/or the pole tube by a taper, and an armature which is axially guided in the interior of the pole cap and which is supported in a membrane structure which is arranged in the interior of the pole cap, wherein the membrane structure extends at least partially over the pole core and the pole tube on the inner surface of the interior, and a valve which is movable axially in the housing along the longitudinal axis by means of the actuator A piston for opening and closing an interface of the valve housing.

According to the invention, the inner surface of the inner space has a plurality of relief grooves distributed at uniform distances at least in the region of the conical portion of the pole body, said relief grooves being used to reduce the magnetic transverse force.

The relief groove reduces the magnetic transverse forces on the one hand, while on the other hand it allows sufficient radial support of the membrane structure on the inner surface, so that deformations of the membrane structure and radial relative movements between the membrane and the installation space can be avoided in particular. It is also possible to limit a large axial relative movement between the membrane and the mounting space. This makes it possible to resolve technical conflicts between the provision of a relief shoulder for reducing the magnetic transverse forces and the provision of the diaphragm support of the armature.

The relief groove is preferably provided as an annular inner groove having an inner diameter larger than the diameter of the inner surface of the inner space. The parallel relief grooves can be inserted into the pole cap simply, for example, simultaneously with the production. The depth and width of the inner groove can be adapted to the respective characteristics provided in a simple manner.

In order to better distribute the magnetic transverse forces, relief grooves are arranged in a uniformly distributed manner in the region of the cone of the pole core.

Depending on requirements, relief grooves can be provided in the region of the tapers of the pole pieces and in the region of the connecting webs.

Deformation and radial displacement of the film structure can be specifically avoided in that the film structure extends beyond the region of the relief groove in the direction of the pole core. In other words, the thin-film structure terminates in a groove-free region of the inner surface, in which no relief groove is provided. In this way, the end region is supported safely and reliably and deformation and radial displacement of the membrane structure can be avoided in a targeted manner.

The hydraulic valve according to the invention can preferably be provided for the hydraulic control of a clutch for an automatic transmission of a motor vehicle or for the hydraulic control of a camshaft adjuster.

Drawings

Further advantages, features and details of the invention are given by the following description of preferred embodiments with the aid of the drawings. The features and feature combinations mentioned in the foregoing in the description and in the following detailed description of the drawings and/or the features and feature combinations shown separately in the drawings can be used not only in the respectively given combination but also in other combinations or in isolation without departing from the framework of the invention. For the sake of overview, elements may not be labeled in all figures, but their systematicness is not lost. In the figure:

fig. 1 shows a part of an electromagnetic hydraulic valve according to the invention in longitudinal section;

fig. 2 shows an enlarged portion Y of the hydraulic valve according to fig. 1;

fig. 3 shows an enlarged section X of section Y according to fig. 2.

Detailed Description

Fig. 1 shows a part of an electromagnetic hydraulic valve 1, which has at least two switching positions and is, for example, a pressure regulating valve as a hydraulic control of a clutch for an automatic transmission of a motor vehicle, in longitudinal section. Fig. 2 and 3 show enlarged parts Y and X of the hydraulic valve 1, respectively.

The hydraulic valve 1 shown in the starting position according to fig. 1 has a valve housing 2, a valve piston, not shown, which is axially displaceable in a bore of the valve housing 2 along a longitudinal axis L of the hydraulic valve 1. The valve piston is movable by means of an electromagnetic actuator 4 of the hydraulic valve 1. The actuator 4, which is a magnet part of the hydraulic valve 1, has an armature 6, which is arranged coaxially with respect to the valve housing 2, in operative connection with the valve piston. Furthermore, the armature 6 is accommodated in a magnetizable housing 8 of the actuator 4 in a displaceable manner by means of an electromagnetic coil 7 which surrounds the armature 6, said housing surrounding the electromagnetic coil 7 on the outer circumference and on at least one end face 3.

Furthermore, the hydraulic valve 1 has a pole cap 9, which is arranged inside the housing 8 and which, in the direction of the end face 3 of the electromagnetic coil 7, comprises a pole core 10 and a pole tube 11 in this order. Pole core 10 and pole tube 11 are integrally connected by a connecting bar 12. Whereby coaxial misalignment can be eliminated. The armature 6 is supported in a membrane structure 14 arranged in the interior 13 (also referred to as armature space), wherein the membrane structure 14 extends at least partially over the pole core 10 and the pole tube 11 on the inner surface of the interior 13. The film structure 14 comprises a film, which is inserted as a cut into the interior 13 and is designed, for example, as a teflon film. Since the membrane is not magnetic, it serves for magnetic separation of the armature 6 and the pole cap 9, thereby reducing the magnetic transverse forces. At the same time, the air gap which arises between the armature 6 and the pole cap 9 is very small, so that the magnetic circuit of the magnet is disturbed as little as possible.

The pole tube 11 is locked to the end face 3 by means of an end cap 15.

The pole cap 9 is designed in the form of a hollow cylinder, wherein the connecting webs 12 are connected to a pole cone 16 on their side facing the pole core 10. The connecting strips 12 are likewise connected to the pole tube cone 17 of the pole tube 11 on their side facing the pole tube 11. It is also possible to form only one of said

conical parts

16, 17. Furthermore, the pole cap 9 and the valve housing 2 can be constructed in one piece, so that the coaxiality of the pole cap with the valve housing axis can be achieved more simply. The longitudinal axis of the valve housing 2 and the longitudinal axis of the actuator 4 are already reliably aligned during production. This ensures an advantageous design of the operation of the armature in the pole tube, as well as an advantageous design of the operation of the hydraulic piston in the valve housing and an advantageous force transmission from the armature to the hydraulic piston.

For simple assembly, the housing 8 is of hollow-cylindrical design and has, in its region facing the end of the valve piston design, a pole piece 18 which surrounds the pole core 10 and is arranged in the axial direction to be supported on a support body 19 of the solenoid coil 7 and on the housing 8. The pole piece 18 can likewise be pressed into the housing 8.

Advantageously, the housing 8 can be cap-shaped or in other words can be formed as a pot-shaped body, and the support body 19 supporting the magnet coil 7 can be simply inserted into the housing 8 and can cover the housing 8 with the pole piece 18.

The inner space 13 filled with hydraulic fluid is substantially closed off with respect to the valve piston by means of a pole plug 20. The pole plug 20 is part of a one-piece valve housing-pole cap assembly. However, other designs of the assembly which are likewise multi-part are not excluded within the framework of the invention. The pole plug 20, in addition to limiting the axial movement of the armature 6, also serves to prevent the hydraulic fluid contained in the inner space 13 from flowing out excessively.

The valve piston is axially displaceable by means of a pin 21 which is axially displaceably received and supported in the pole plug. The valve piston is moved axially by the energization of the solenoid 7, wherein a restraining element, not shown, which is arranged on the end face of the valve piston facing away from the actuator 4 exerts a restraining force on the valve piston, against which the valve piston is movable. The restraint element, which is embodied, for example, as a helical compression spring, is supported on a spring cover, which is arranged with a press fit in the region of the housing end face of the valve housing 2 facing away from the actuator 4.

In operation, the electromagnetic coil 7 excites and generates a magnetic field which magnetizes the pole piece 10, the armature 6, the pole tube 11 and the housing 8.

The housing 2 has an interface, not shown, which is connectable by means of the valve piston and depending on the position of the hydraulic valve 1. The function of the hydraulic valve 1 as a transmission valve or as a hydraulic valve for a camshaft adjuster is generally known, so that no corresponding description is given.

As can be seen further from fig. 1, the pin 21, which can be displaced relative to the armature 6, has a disk-shaped projection 22, which bears directly against an armature end face 23 of the armature 6. The pin 21 therefore rests against the armature 6 without intermediate connection of further elements and is not connected to the armature, whereby the risk of contamination of the actuator 4 is reduced. Furthermore, the armature 6 has a passage opening 24, which is formed coaxially to the pin 21 and which extends completely through the armature and has a diameter which is smaller than the outer diameter of the disk-shaped projection 22. Thereby covering the through opening 24 of the armature 6 which allows a rapid movement of the armature 6 when the armature 6 moves in the armature space 13.

It can also be seen that the pin 21 is supported in a simple manner with its smaller outer diameter in the pole plug 20, wherein sealing takes place by means of a gap seal. After assembly, the pin 21 in the pole cap 9 is furthermore in a loss-proof state by means of the first projection 22.

In order to achieve stop damping, the disk-shaped projection of the pin 21 has at least one recess 25, which is arranged so as to be able to flow through the passage opening 24 of the armature 6, so that hydraulic fluid can be guided in a simple manner out of the armature 6 or into the armature 6 in a damped manner. The recess 25 has no material boundary directed outward by the projection 22, whereby a desired baffle plate with almost no thickness can be realized. The temperature dependence of the damping, which is based on the hydraulic fluid present therein, can thereby be reduced to a minimum.

When the stroke is large, the clearance 25 of the pin 21 also automatically allows a flow around, so that the damping is also hardly dependent on the armature position.

The disk-shaped projection 22 can also function as a non-contact disk which prevents the magnetic contact of the armature 6 on the pole plug 20.

In order to improve the actuating quality of the hydraulic valve 1, the substantially cylindrical inner surface of the interior 13 has a plurality of relief grooves 26 distributed at uniform distances, at least in the region of the pole cone 16, which can be seen in particular in fig. 3. The relief groove 26 serves on the one hand to advantageously reduce magnetic transverse forces and on the other hand to allow sufficient radial support of the thin-film structure 14 on the inner surface. In other words, a plurality of strips is formed by the respective relief groove 26, by means of which the film is supported in the radial direction in the region of the relief groove 26. This makes it possible in particular to avoid deformation of the membrane and radial relative movements between the membrane and the armature space 13. A large axial relative movement between the diaphragm and the armature space 13 can likewise be limited by the axial shoulder 27 on the pole plug 20. This makes it possible to resolve technical conflicts between the provision of a basically known relief shoulder for reducing magnetic transverse forces and the provision of the diaphragm support of the armature 6.

As can be seen from fig. 3, the relief grooves 26 are provided as parallel, annular inner grooves having an inner diameter which is larger than the inner surface of the armature space 13. They can be inserted in a simple manner, for example, during the production of the pole cap 9. The depth and width of the inner groove can be adapted to the respective characteristics specified in this case in a simple manner.

Furthermore, the relief grooves 26 are arranged in a uniformly distributed manner in the region of the pole cone 16. Depending on the requirements of the hydraulic valve 1, the relief grooves can also be arranged in the region of the pole cone 10 and in the region of the connecting webs 12, distributed evenly as shown in the exemplary embodiment.

The relief groove 26 is arranged here such that an end region 28 of the film is positioned outside the relief groove 26. In other words, the film structure 14 extends in the direction of the pole body 10 in the region of the cone 16 and likewise extends outwardly beyond the region of the relief groove 26 and ends in the region of the inner surface without a recess, in which no relief groove 26 is provided. In this way, the end region 28 is supported in a secure and reliable manner and deformation and radial displacement of the membrane structure 14 can be avoided in a targeted manner.

The utility model discloses an electromagnetic hydrovalve (1), it includes

An electromagnetic actuator (4) having a magnetizable housing (8) which surrounds an electromagnetic coil (7) on the outer circumference and on at least one end face (3),

a pole cap (9) which is arranged inside the housing (8) and comprises a pole core (10) and a pole tube (11) axially in the direction of the end face (3) of the solenoid, wherein the pole core (10) and the pole tube (11) are integrally connected by a connecting strip (12), wherein the connecting strip (12) is connected to the pole core (10) and/or the pole tube (11) by means of a taper (16, 17),

an armature (6) which is guided axially in the interior (13) of the pole cap (9) and which is supported in a membrane structure (14) which is arranged in the interior (13) of the pole cap (9), wherein the membrane structure (14) extends on the inner surface of the interior (13) at least partially over the pole core (10) and the pole tube (11),

a valve piston which is movable in the valve housing (2) axially along the longitudinal axis (L) by means of the actuator (4) and which serves for opening and closing the connection of the valve housing (2),

characterized in that the inner surface of the inner space (13) has a plurality of relief grooves (26) distributed at uniform distances at least in the region of the conical section (16) of the pole body (10) for reducing magnetic transverse forces.

In the electromagnetic hydraulic valve (1) described above, the relief groove (26) is provided as an annular inner groove having an inner diameter which is greater than the diameter of the inner surface of the inner space (13).

In the electromagnetic hydraulic valve (1) described above, the relief grooves (26) are arranged in a uniformly distributed manner in the region of the cone (16) of the pole body (10).

In the case of the electromagnetic hydraulic valve (1) described above, the relief groove (26) is arranged in the region of the cone (16) of the pole body (10) and in the region of the connecting bar (12).

In the case of the electromagnetic hydraulic valve (1) described above, the relief grooves (26) are arranged in a uniformly distributed manner in the region of the cone (16) and in the region of the connecting bar (12).

In the electromagnetic hydraulic valve (1) described above, the diaphragm structure (14) extends beyond the region of the relief groove (26) in the direction of the pole body (10) in an outward manner.

In the electromagnetic hydraulic valve (1) described above, the hydraulic valve (1) is provided for the hydraulic control of a clutch for an automatic transmission of a motor vehicle.

In the electromagnetic hydraulic valve (1) described above, the hydraulic valve (1) is provided for hydraulic control of a camshaft adjuster.

List of reference numerals

1 hydraulic valve

2 valve housing

3 end face

4 actuator

5

6 armature

7 electromagnetic coil

8 casing

9 polar cap

10 pole core

11 pole tube

12 connecting strip

13 inner space

14 thin film structure

15 end cap

16 pole cone

17 polar tube conical part

18 pole piece

19 support body

20 pole plug

21 pin

22 projection

23 armature end face

24 through opening

25 concave part

26 unloading groove

27 shoulder

28 end region

L longitudinal axis

Claims

1. An electromagnetic hydraulic valve (1) comprising

2. The electromagnetic hydraulic valve (1) according to claim 1, characterised in that the relief groove (26) is provided as an annular inner groove having an inner diameter larger than the diameter of the inner surface of the inner space (13).

3. The electromagnetic hydraulic valve (1) according to claim 2, characterised in that the relief grooves (26) are arranged in a regularly distributed manner in the region of the cone (16) of the pole body (10).

4. The electromagnetic hydraulic valve (1) according to claim 2, characterized in that the relief groove (26) is arranged in the region of the cone (16) of the pole body (10) and in the region of the connecting bar (12).

5. The electromagnetic hydraulic valve (1) according to claim 4, characterised in that the relief grooves (26) are arranged in the region of the cone (16) and in the region of the connecting strip (12) in a regularly distributed manner.

6. The electromagnetic hydraulic valve (1) according to one of claims 1 to 5, characterised in that the membrane structure (14) extends beyond the region of the relief groove (26) in the direction of the pole piece (10) in an outward direction.

7. The electromagnetic hydraulic valve (1) according to one of the claims 1 to 5, characterised in that the hydraulic valve (1) is provided for hydraulic control of a clutch for an automatic transmission of a motor vehicle.

8. The electromagnetic hydraulic valve (1) according to claim 6, characterised in that the hydraulic valve (1) is provided for hydraulic control of a clutch for an automatic transmission of a motor vehicle.

9. The electromagnetic hydraulic valve (1) according to one of the preceding claims 1 to 5, characterised in that the hydraulic valve (1) is provided for hydraulic control of a camshaft adjuster.

10. The electromagnetic hydraulic valve (1) according to claim 6, characterised in that the hydraulic valve (1) is provided for hydraulic control of a camshaft adjuster.