WO2006084788A1

WO2006084788A1 - Solenoid valve

Info

Publication number: WO2006084788A1
Application number: PCT/EP2006/050384
Authority: WO
Inventors: Hans-Jörg Feigel; Christoph Voss
Original assignee: Continental Teves Ag & Co. Ohg
Priority date: 2005-02-10
Filing date: 2006-01-24
Publication date: 2006-08-17
Also published as: DE102005006228A1

Abstract

The invention relates to a solenoid valve whose armature (3) is exposed to an axial input and output of magnetic lines of force (4) in the area of the axial air gap (2) in order to better utilize the magnetic force when current flows through the solenoid (1).

Description

Solenoid valve

The invention relates to a solenoid valve according to the preamble of patent claim 1.

From EP 1 124 714 Bl, such a solenoid valve is already known, the valve housing receives a cooperating with a magnet armature valve closure member which is directed to a valve seat in the valve housing. For actuating the magnet armature, a magnet coil is provided, which generates a magnetic field during electrical energization whose lines of force axially enter via an axial air gap in the magnet armature, however, radially emerge via the armature jacket surface in the direction of the magnetic jacket surface of the valve housing. By dividing the magnetic force into an axial and radial force component, the magnetic field can not be used optimally for actuating the valve. Another disadvantage arises as a result of a resulting from the radial component of the field line course braking the armature.

Therefore, it is the object of the present invention to improve a solenoid valve of the specified type such that the aforementioned disadvantages are avoided.

This object is achieved for a solenoid valve of the type indicated with the characterizing features of claim 1. Other features, advantages and applications of the invention will become apparent from the following description of several embodiments.

Show it :

1 shows an embodiment of the subject invention in the form of a closed in the basic position solenoid valve,

FIG. 2 shows a design variant of the electromagnetic valve according to FIG. 1 with an extended armature guide,

3 shows an embodiment of the subject invention in the form of a normally open solenoid valve,

Figure 4 shows an embodiment of the subject invention of Figure 3 with one of FIG. 3 deviating arrangement of a check valve in the valve housing,

FIG. 5 shows a solenoid valve which is open in the basic position and has a passage of a pressure medium channel in the magnetic section of the valve housing;

FIG. 6 shows a solenoid valve closed in the basic position with a passage of a pressure medium channel in the magnetic section of the valve housing;

Figure 7 is a plan view of the armature with through holes in the form of radial slots, which in the solenoid valves of FIG. 5-6 apply,

Figure 8 is a designed as a two-stage valve solenoid valve in its closed position.

Before discussing all the details shown in FIGS. 1-8, the common features of the illustrated solenoid valves with regard to the essential features of the invention will be explained.

Each solenoid valve shown in longitudinal section, shown as a 2/2-way poppet valve has a valve body designed in a cartridge housing 6, which receives a cooperating with a magnet armature 3 valve closure member 14 which is directed to a valve seat 8 in the valve housing 6. For actuating the magnet armature 3, a magnetic coil 1 is advantageously integrated in the valve housing 6. An axial air gap 2 is located between a magnetic flux conducting section 5 of the valve housing 6 and the magnet armature 3, wherein according to the invention, the magnetic armature 3 is subjected to an axial entry and exit of magnetic field lines 4 when the magnetic coil 1 is current-flowed through this axial air gap 2.

To achieve the particularly advantageous for the function of the solenoid valve axial inlet and outlet of magnetic field lines 4 in or. From the magnet armature 3, one of the magnetic coil 1 facing end surface of the armature 3 covers a the outer periphery of the magnetic coil 1 enclosing, the magnetic flux conducting portion 5 of the valve housing 6, which is why the outer diameter Dl of the armature 3 is selected to be larger than the outer diameter D2 of the magnetic coil. 1 The magnetic coil 1 is inserted as shown below from the bottom in a matched to the size of the magnetic coil 1 annular groove of the magnetically conductive portion 5 fluid-tight.

The armature 3 is designed as a plate anchor, the height / width ratio specifying factor is less than one, preferably between 0, 05 to 0, 15 in order to achieve the lowest possible valve height with the best magnetic force utilization. To reduce the hydraulic Liche resistance of the armature 3 is provided with a plurality of distributed over the armature surface symmetrically to the valve longitudinal axis through holes 13 and / or if necessary on the outer circumference with symmetrically distributed recesses. The armature 3 and the through holes 13 and possibly. The recesses are made particularly simple by punching the magnet armature 3. By a favorable arrangement and design of the through holes 13, the field line course can be influenced if desired or required, for which purpose in the present embodiments according to Figures 1-4, 8, the through holes 13 preferably located immediately below the coil winding of the magnetic coil 1 in the armature 3 and in Diameter are approximately adapted to the winding thickness of the coil winding.

The magnetic flux conducting portion 5 of the valve housing 6 is in all embodiments of a preferred by cold striking or extrusion or possibly. Also manufactured by machining of free cutting steel cylinder part, which combines the previously known from the prior art individual components, consisting of a magnetic core in the magnetic coil 1 and the outer circumference of the magnetic coil 1 enclosing yoke ring, now united as a homogeneous unit extremely advantageous.

The magnetic flux conducting portion 5 of the valve housing 6 is at the same time designed as a plurality of pressure medium channels 9, 10 in a housing 11 sealing sealing plug in which the solenoid coil 1 is accommodated as an integral part fluid-tight. By this particularly clever combination of different functions of the magnetically conductive portion 5, the manufacturing effort and the valve size can be significantly reduced. Since the End plug consists of a material harder with respect to the material of the housing 11 and the outer periphery has a step with an annular groove 12, it can be easily pressed into the softer material of the housing 11 to produce a pressure-tight, permanent connection, including the material of the housing 11 in the annular groove 12 is displaced.

The valve housing 6 furthermore has a further section 7 which does not conduct the magnetic flux and adjoins the lateral surface of the magnet armature 3 in sections. The magnetic flux non-conductive further section 7 of the valve housing 6 consists of a particularly cost-effective and precisely produced by deep-drawing sleeve part, the sleeve edge is attached to the magnetic flux conducting portion 5 of the valve housing 6 pressure fluid-tight preferably by means of a welded connection. The sleeve part further has a pot contour, the bottom of the pot is provided with an opening which is delimited by a valve seat 8, which is preferably made by embossing the austenitic sheet metal part due to the execution of the thin-walled sleeve part. Another, produced by embossing opening 20 is located in the valves of Figures 1-4, 8 below the magnet armature 3 in the lateral surface of the sleeve part to the horizontally extending in the housing 11 pressure medium channel 9 with a below the valve seat 8 in the housing 11 arranged pressure medium channel 10 to connect.

As another component used identically for all of the solenoid valves shown in FIGS. 1-4, 7, 8, reference is made to the advantageous arrangement of a guide tube 15 fastened to the magnet armature 3 by a press fit, which centrally guides the disc-shaped magnet armature 3. penetrates, wherein the valve closing member 14 remote from the pipe section is guided in a centrally between the magnetic coil 1 in the magnetic portion 5 of the valve housing 6 opening blind bore 16. Between the guide tube 15 and the blind bore 16, a compression spring 17 is clamped, which holds the armature 3 to the axial gap 2 from the magnetic portion 5 of the valve housing 6 in the electrically non-energized state of the solenoid coil 1. Due to the overwhelming integration of the compression spring 17 in the stepped guide tube 15, a particularly space-saving arrangement of the long compression spring 17 in the valve housing 6 results.

On the basis of the features described so far, which in addition to avoiding the disadvantages already described in the prior art lead to a substantial simplification of the valve assembly as a result of the use of uniform components for the illustrated solenoid valves, now the apparent from Figures 1 to 8 further details and Differences of the solenoid valves explained.

The solenoid valve shown in Figure 1 has at the end facing away from the compression spring 17 end of the guide tube 15 on a spherical valve closure member 14 which is pressed under the action of the compression spring 17 against the valve seat 8. By this simple structural measure, a closed in the basic position solenoid valve is created, which performs a stroke in electromagnetic excitation according to the dimension of the A xialluftspalt 2 to allow a pressure medium connection between the two pressure medium channels 8, 9 in the housing 11, if necessary.

In contrast to FIG. 1, FIG. 2 shows the solenoid valve, which is closed in the basic position, with a guide tube 15, which is extended below the magnet armature 3 and whose tube extension extends along a tube extension. directed cylinder projection 24 of the bottom of the pot is performed. This results in a further improved leadership of the armature 3 in the axial direction. The valve closing member 14 is in this case pressed into the guide tube 15 as a press-fit pin and acted upon directly by one end of the compression spring 17. The remaining apparent from Figure 2 features can be found in the foregoing description parts.

In contrast to FIGS. 1, 2, FIG. 3 shows a solenoid valve which is open in the basic position, for which purpose only the valve seat 8 with the valve closure member 14 is displaced to the side of the cup base facing away from the magnet armature 3, so that the pressure spring 17 remains while retaining the previously described construction of the magnetic drive the guide tube 15 presses in the direction of the bottom of the pot, wherein the release of the valve seat 8 on the guide tube 15, a pressure pin 21 is arranged, which extends through the opening of the valve seat 8 with play on the spherical valve closure member 14 and keeps it away from the valve seat 8. For functionally correct arrangement of the valve closing member 14 in the vicinity of the valve seat 8, the valve closing member 14 is guided play in a ball holder 22 which is fixed to the bottom of the pot. Below this is also a hydraulically actuated check valve 27 which can be applied to a separate valve seat. The remaining apparent from Figure 3 features are shown in the foregoing description parts.

Deviating from FIG. 3, FIG. 4 shows the check valve 27 in direct contact with the ball holder 22 known from FIG. 3, for which purpose it is provided with a valve seat which can be closed by the spherical check valve 27. All further details shown correspond to the embodiment in FIG. 3. In contrast to the solenoid valves described so far, FIG. 5 shows the valve seat 8 in which the magnetic flux conducting section 5 of the valve housing 6 is integrated, for which purpose a tube having the valve seat 8 is pressed into the blind bore 16 and can be flowed through to the upper end of the blind bore 16 is, wherein in section 5 at the blind bore 16 a directed to the pressure medium channel 9 channel perpendicular to the valve axis connects, in which a blend pot 25 is pressed. In order to position the armature 3 connected to the valve closing member 14 in the normally open position about the Axialluftspalt 2 away from the section 5, the compression spring 17 is particularly space-saving between the armature 3 and the valve seat 8 within the blind bore 16. The concentrically attached to the disc-shaped magnet armature 3 by means of press-fitting valve closure member 14 is in this case directed with its push-shaped portion within the cylindrical compression spring 17 on the valve seat 8, while a stoßiförmigen portion of the valve closure member 14 facing away from tappet extension for magnet armature guidance by the armature 3 in the direction of the bottom of the pot extends. Since the tappet extension receiving opening in the bottom of the pot is designed as a tight tolerance clearance, there are more openings in the bottom of the pot for unimpeded flow through the valve housing 6 in the direction of the valve seat eighth

In order to allow a bypass of the normally via the valve seat 8 leading flow path, if necessary, is parallel to the blind bore 16, a further flow channel 26 in section 5, in which a check valve 27 is inserted. The check valve 27 ensures that only a bypass connection between the two pressure medium channels 8, 9 is possible in the electromagnetically closed position of the solenoid valve when the pressure is lowered in the pressure medium channel 9 under the pressure in the pressure medium channel 10. This measure is important, for example, for the use of the described solenoid valve in a provided with anti-lock control vehicle brake system, as on the bypass connection when stopping the brake j ederzeit by opening the check valve 27, a pressure reduction is ensured in the wheel.

FIG. 6, starting from the electromagnetic valve of FIG. 1 closed in the basic position, largely displaces the flow path for a solenoid valve closed in the basic position into the magnetic section 5. Analogous to the solenoid valve of FIG. 5 is facing away from the armature 3 end of the blind bore 16 with a channel in the magnetic portion 5 in conjunction, which is directed to the pressure medium channel 9. The flow through the solenoid valve is thus carried out in the lifted off from the valve seat 8 position of the valve closing member 14 via the through holes 13 of the armature 3 in the blind bore 16 and from there via a guide tube 15 across the magnetic portion 5 to the side of the section 5 in the housing 11 opening Pressure medium channel 9.

FIG. 7 shows a top view of the magnet armature 3 for clarification of the flower-shaped passage opening 13, which can be seen in FIGS. 5, 6 exclusively in the side view of the armature 3 as a slot. The passage opening 13 shown in FIG. 7 represents a preferred embodiment which enables a low-resistance flow through the magnet armature 3 with little outlay on manufacture.

Finally, FIG. 8 shows, based on the electromagnet netventil of Figure 2 a designed as a two-step valve, closed in the basic position solenoid valve. It differs from Figure 2 in that the valve seat 8 is not arranged in the bottom of the pot non-magnetic portion 7, but in a movable valve piston 28 which is guided below the armature 3 within the guide tube 15 known from Figure 2. The thus arranged in series with the valve closing member 14 valve piston 28 closes in the electromagnetically not energized Magnetankerstellung under the action of the compression spring 17 another arranged in the bottom of the pot valve seat 29 Further, located between the bottom of the pot and a valve piston 28 fixed spring stop 18, a further compression spring 19, the electromagnetic valve excitation of the armature 3, the valve piston 28 can remain on the valve closure member 14, provided that the valve piston 28 is hydraulically pressure balanced. The valve closing member 14 acts as a pilot stage and only gives a comparison with the other valve seat 29 comparatively small throttle area, so that the volume flow rate is largely determined by the hydraulically initiated position of the valve piston 28.

The presented electromagnetic valves are preferably used in a slip-controlled vehicle brake system for which the only partially formed block-shaped housing 11 has a plurality of valve receiving bores in a plurality of rows for receiving the illustrated two-stage valve and the illustrated normally closed and normally open solenoid valves in a surface of the Housing 11 are embedded. This results in a particularly compact braking device, the block-shaped housing 11 is particularly low due to the low height of the illustrated solenoid valves. The pictured E- lektromagnetventile fulfill the function of the Bremsdruckauf- and the brake pressure reduction in the wheel brakes in the slip rule case to influence targeted by means of a suitable control electronics, the preferred area and thus extremely compact rests on the top of the solenoid valves on the housing 11.

In summary, the result of the proposed inventive features a particularly short-built solenoid valve in various embodiments with a relation to the previously known valves approximately twice as large magnetic force. The inventively proposed solenoid valves can be completely submerged in the housing 11, which is ensured by the complete integration of the solenoid 1 in the valve housing 6 and due to the complete integration of the valve housing 6 in the channel-guiding housing 11 excellent heat dissipation for the magnetic drive.

The complete integration of the solenoid valves in the block-shaped housing 11 also facilitates the arrangement of a required for the activation of the solenoid valves control electronics, which is preferably arranged directly on the surface of the housing 11, from which the contacts 23 of the magnetic coil 1 protrude. This results in a good heat dissipation for the control electronics, since the housing 11 is preferably made of a light metal alloy and acts as a heat sink.

If, according to some embodiments shown, the channel guide is displaced into the magnetic section 5 of the valve housing 6, the valve housing 6 is shortened again since the nonmagnetic section 7 is then reduced to the projection required on the magnetic section 5 for actuation of the magnet armature 3. can be decorated

Reference sign list

1 solenoid

2 axial air gap

3 magnetic armature

4 magnetic field line

5 section

6 valve housing

7 section

8 valve seat

9 pressure medium channel

10 pressure medium channel

11 housing

12 ring groove

13 passage opening

14 valve closure member

15 guide tube

16 blind hole

17 compression spring

18 spring stop

19 compression spring

20 opening

21 push pin

22 ball holders

23 contact

24 cylinder projection

25 Blend pot

26 flow channel

27 check valve

28 valve piston

29 valve seat

30 valve receiving bore

Claims

claims

1. Solenoid valve, comprising a valve housing which receives a cooperating with a magnet armature valve closure member which is directed to a valve seat in the valve housing, with a solenoid for actuating the armature and an axial air gap between a magnetic flux conducting portion of the valve housing and the armature, wherein at current-carrying magnet coil of the armature is exposed to a Einais also leakage of magnetic field lines, characterized in that the magnetic field lines (4) on the Axialluftspalt (2) in the armature (3) as well as executable.

2. Electromagnetic valve according to claim 1, characterized in that one of the magnetic coil (1) facing the magnetic armature end face the magnetic flux conducting section

(5) of the valve housing (6) on the outer circumference of the magnetic coil (1) covered, for which the outer diameter (Dl) of the magnet armature (3) is selected to be greater than the outer diameter (D2) of the magnetic coil (1).

3. Electromagnetic valve according to claim 1 or 2, characterized in that the valve housing (6) has a magnetic flux non-conductive further portion (7), in which the magnet armature (3) is movable.

4. Electromagnetic valve according to claim 1, characterized in that the magnetic flux conducting portion (5) of the valve housing (6) consists of a made by cold striking, extrusion or by machining a machined steel cylinder part.

5. Electromagnetic valve according to claim 3, characterized in that the magnetic flux non-conductive further portion (7) of the valve housing (6) consists of a manufactured by deep-drawing sleeve part, the pressure-tight at the magnetic flux conducting portion (5) of the valve housing (6) is attached.

6. Electromagnetic valve according to claim 5, characterized in that the sleeve part has a pot contour whose provided with a valve opening pot bottom has a valve seat (8), which is preferably made in the embossing process.

7. Electromagnetic valve according to one of the preceding claims, characterized in that the magnetic flux conducting portion (5) of the valve housing (6) has the contour of a plurality of pressure medium channels (9, 10) in a housing (11) sealing sealing plug, in which as integral Part of the solenoid coil (1) is received fluid-tight.

8. Electromagnetic valve according to claim 7, characterized in that the sealing plug consists of a material which is harder relative to the material of the housing (11) and in that the sealing plug has on the outer circumference a step with an annular groove (12) into which the softer material of the housing (12) 11) is displaceable to produce a pressure-tight, non-detachable connection with the sealing plug.

9. Electromagnetic valve according to one of the preceding claims, characterized in that the magnet armature (3) is designed as a plate anchor, the height / width ratio indicating factor is less than one, preferably between 0, 05 and 0, 15.

10. Electromagnetic valve according to one of the preceding claims, characterized in that the magnet armature (3) to reduce the hydraulic resistance with a plurality of evenly over the magnet armature end face and / or on the outer circumference of the magnet armature (3) distributed through openings (13) and / or recesses is provided ,