JP4790177B2 - Especially solenoid valve for slip control type hydraulic brake device - Google Patents

Description

[0001]
The invention relates to a solenoid valve, in particular for a slip-controlled hydraulic brake device, as defined in the preamble of claim 1.
[0002]
Such publicly known valves for controlling the flow of fluid in a slip control type hydraulic brake device are actually used in various ways.
[0003]
German Patent Application No. 1980826 discloses an electromagnetic valve that opens in a basic position for a slip-controlled hydraulic brake device. The valve case of this electromagnetic valve is formed as a cartridge structure. This cartridge structure is particularly wedged in a block-shaped valve housing as a turning part made from free-cutting steel. The valve plate forming the valve seat is also relatively strong and is produced in particular from turning parts made of free-cutting steel as well. This turning part is held by caulking in the lower end region of the valve casing. The valve stem, which cooperates with the valve seat, is guided in the valve casing and is a sturdy shaft part consisting of a solid cylinder. This shaft portion is supported on the end face of the magnetic armature in association with the adjusting bush. This magnetic armature is guided in a valve sleeve section on the valve casing. In order to lift and hold the valve protruding rod from the valve seat at the basic position of the electromagnetic valve, a so-called return spring is provided coaxially with the valve protruding rod. One end of the return spring pushes the valve stem with the adjusting bush toward the magnetic armature.
[0004]
The kind of solenoid valve that closes in the basic position is already known. This solenoid valve is described, for example, in German Published Patent Application No. 19727654. Unlike the previously described valve that opens in the basic position, in the case of the valve that closes in the basic position, the valve stem made from the solid body has a magnetic armature that can be handled and operated substantially independently. A subassembly is formed. This subassembly is directed towards the valve seat by a compression spring supported on a magnetic armature, and holds the valve seat closed in the above basic position of the solenoid valve.
[0005]
The solenoid valve described above has the disadvantage that the manufacturing costs required to fabricate the details of the valve and to insert the entire functional assembly into the valve housing are relatively high.
[0006]
Therefore, an object of the present invention is to provide an embodiment or a basic position that is opened at the basic position so that the structure in which reliability is ensured and the structure can be manufactured relatively easily is maintained and the manufacturing cost is greatly reduced. It is an improvement of the solenoid valve of the embodiment that is closed with.
[0007]
This problem is solved by the features described in the characterizing part of claim 1 according to the invention in a solenoid valve of the kind mentioned at the outset.
[0008]
Suitable means are provided by the means described in the dependent claims. This embodiment will now be illustrated and described in detail based on FIGS. 1a-3 in connection with other features and advantages of the present invention.
[0009]
First, the basic overall structure of the solenoid valve opened at the basic position will be described with reference to FIG. 1a. The electromagnetic valve shown in the longitudinal section includes a bush-like valve casing 3. This valve casing is provided with guide surfaces 3a, 3b in both end ranges. Thereby, the dome-shaped valve sleeve 1 can be held, and the bowl-shaped valve seat-housing 7 can be held at the other end. Therefore, the valve casing 3 forms a central body suitable for the above parts. This central body is responsible for the function of the magnetic core 25 at the same time. In order to produce the above parts at the lowest possible cost, the valve casing 3 is formed by cold extrusion press parts, and the valve sleeve 1 and the bowl-shaped valve seat-housing 7 are formed as deep drawing parts. In this case, the valve seat-housing 7 is formed in a bowl-shaped bottom by a stamping method, and a valve seat surface for the check valve 10 and a valve seat surface for the valve closing member 9 attached to the valve projecting rod 4. It has. Another structure of technical and functional importance arises by forming the valve stem 4 as a thin-walled sleeve part. This sleeve part can be manufactured precisely and at a very low cost as a rotary aging part or in some cases as a deep drawing part. The simple contour determined by the thin-walled sleeve contour of the valve stem 4 allows a very desired arrangement of the return spring 8 according to the shape of FIG. Since this return spring is concentrically held by the valve rod 4, one winding end of the spring is supported by the funnel-shaped enlarged portion of the rod, and the other winding end is a bowl-shaped valve seat. It is supported on the bottom of the container 7. In the illustrated embodiment, the valve closing member 9 is formed by a steel ball surrounded in the form of a tongue in the end region of the valve rod 4. On the side opposite to the valve closing member 9, the check valve 10 already described is further provided at the bottom of the bowl-shaped valve seat-housing 7, which is similarly formed as a steel ball. The position of this steel ball is fixed on a bypass hole 12 at the bottom of the bowl having the second valve seat by a bowl-shaped filter 11 fitted to the valve seat-housing 7. An adjustment pin 2 is provided in the valve rod 4. The adjustment pin protrudes from the valve protrusion 4 toward the magnetic armature 13. The adjustment pin 2 is made of a polygonal shape. This profile has a triangular cross section according to the AA cross section and is slidable within the projecting rod tube to adjust the magnetic armature residual gap and forms a press fit with the projecting rod tube. .
[0010]
In addition, it should be pointed out that, of course, after the adjustment pin 2 has been completely adjusted, additional positioning of the components in the valve stem 4 is performed by means of suitable frictional connection means and / or complementary shape connection means. Can do.
[0011]
Similarly, a magnetic armature 13 produced by cold extrusion press parts contributes to producing a solenoid valve at low cost. As shown, the magnetic armature extends into the valve sleeve 1 above the valve casing 3 acting as a magnetic core 25. The magnetic armature 13 can also be manufactured as a polygonal shape. It is advantageous if the magnetic armature 13 is adjustable in the valve sleeve 1 regardless of the position of the valve stem 4. Accordingly, the magnetic armature 13 and the valve projecting rod 4 form an independent part, are connected as an axial force transmission member, and act independently of each other in the radial direction. The valve stem 4 is basically formed as a tube, and the adjustment pin 2 and possibly the magnetic armature 13 are made of a polygonal profile, so that the valve stem 4 with the lateral passage 14 and in the valve A pressure balance occurs in the sleeve 1, and this pressure reaches the hollow chambers 15, 16 on both sides of the valve casing 3. The solenoid valve thus formed as a cartridge is a wall-shaped valve with a relatively thick wall in the range of the caulking part 17 only for fixing within the block-like valve support 6. A casing 3 portion is provided. In the valve casing portion, the electromagnetic valve is almost frictionally connected within the receiving hole 18 of the valve support 6 by the caulking force in the axial direction applied to the valve support 6. The accommodation hole 18 is formed as a stepped hole. In this case, after the caulking operation is completed, the edge portion 20 of the bowl-shaped valve seat-housing body 7 does not leak liquid between the shoulder portion 5 of the valve case 3 and the step portion 19 of the valve support 6. So that it is pinched. The protrusion 31 provided with the guide surface 3b of the valve casing 3 extending into the bowl-shaped valve seat-housing body 7 supports the valve seat-housing together with the bowl-shaped filter 11 and the check valve 10 therein. Prior to being inserted into the body 6, a reliable preassembly and handling operation of the valve seat-housing body 7 on the valve casing 3 takes place. For example, the valve sleeve 1 is not only fitted on a cylindrical projection having a guide surface 3a of the valve case 3, but is also permanently fixed by a welded connection 19 after complete adjustment. Of course, instead of the welded connection 19, alternative frictional connection fixing methods and shape-complementary connection fixing methods can be used. Except for the check valve provided on the side in the valve, all other components are arranged concentrically with respect to the valve longitudinal axis.
[0012]
Unlike the above-described embodiment shown in FIG. 1a, in the next structural modification of the illustrated solenoid valve, details different from FIG. If all the details of the respective valve deformation are not explained, this detail is clear from the foregoing description, since this detail corresponds to the embodiment of FIG. 1a.
[0013]
FIG. 1b differs from FIG. 1a in that it shows a solenoid valve in which a separate sleeve body 22 with a press fit in the valve seat-housing body 7 is press-fitted into the bowl-shaped valve seat-housing body 7. . This sleeve body is provided with a spherical sealing surface acting as a valve seat on the end surface near the valve closing member 9. Further in this case, the sleeve body 22 has the function of the adjusting pin 2 shown in FIG. 1a in order to adjust the magnetic armature residual air gap. This is because, unlike FIG. 1, the tubular valve rod 4 is directly mounted on the end face of the magnetic armature 13 in FIG. 1b.
[0014]
Also in the embodiment of the solenoid valve of FIG. 1c, the sleeve body 22 described based on FIG. 1b is used. However, the difference is that this sleeve body is directly press-fitted into the valve casing 3 extending toward the filter bottom. Thereby, unlike the illustration of FIGS. 1 a, 1 b, the valve seat-housing 7 forms an integral part of the valve casing 3.
[0015]
The solenoid valve shown in FIG. 1d is very similar to the solenoid valve of the embodiment of FIG. 1b. This bowl-shaped valve seat-housing body 7 of the electromagnetic valve has a very slim sleeve-like section in the range of the solid sleeve body 22. A bowl-shaped filter 11 is fitted in the sleeve-shaped section. At the same time, a check valve and a bypass passage 12 belonging to the check valve 10 are skillfully provided in the pot-shaped filter 11. The valve seat-housing 7 in the valve casing 3 is fixed by a caulking portion in the radial direction formed on the guide surface of the thin-walled valve seat-housing 7 from the outside. This radial caulking is shown in this cross-sectional view as a projection 23 facing the projection 31 of the valve casing 3.
[0016]
All the solenoid valves described above can have the function of a pressure control valve (relief valve) in a very simple manner. This function will now be described by way of example with reference to FIG. 1e. Instead of the above-described fixed arrangement of the valve closing member 9, the valve closing member 9 is axially arranged on the valve protruding rod 4 by providing the tubular valve protruding rod 4 with a roughly hollow cylindrical chamber. It is arranged to be movable. For this purpose, the valve closing member 9 is inserted into the hollow chamber of the valve protruding rod 4 from the upper side in the form of a plunger, and its conical abutment shoulder rests on the end of the tapered protruding rod, and at the same time the valve closing member 4 The closure projecting from the open end of the sleeve is biased by a spring and faces towards the sleeve body 22 or the valve seat-housing 7. The opening pressure that affects the function of the relief valve is determined by the valve spring 24. This valve spring is compressed and inserted between the valve closing member 9 and a stopper press-fitted into the valve rod 4. Thereby, in a closed position of the electromagnetically excited valve, first as is known, the valve closing member 9 contacts the valve seat-housing 7 so as not to leak pressure. This contact is made until the hydraulic pressure generated below the valve seat-container 7 exceeds the pressure applied to the valve closing member 9 by the valve spring 24. Thereby, the valve closing member 9 moves away from its valve seat and thus achieves a relief valve function.
[0017]
The important features of the present invention will now be described clearly with reference to FIG. 2a on the basis of a solenoid valve closing in the basic position as usual. Following this description, the deformation of the valve components will be described with reference to FIGS.
[0018]
The solenoid valve shown in FIG. 2a is fixed to the valve casing 3 in the same manner as the solenoid valves shown in FIGS. 1a to 1e. The magnetic armature 13 is manufactured as a cold extrusion press part, the magnetic core 25 is manufactured from a cold extrusion press part. The bowl-shaped valve seat-container 7 is provided. When a thin-walled sleeve part is used, this sleeve part is preferably formed as a deep drawing part or in some cases as a rotary aging part, as in the previous embodiment. In this context, FIG. 2a shows a sleeve-like valve casing 3 formed as a deep drawing part. Both ends of the valve casing form guide surfaces 3a and 3b, one side of which is defined by a magnetic core 25 and the other side is defined by a bowl-shaped valve seat-housing 7. Both parts 25, 7 attached to the sleeve-like valve casing 3 are permanently fixed, in particular by means of a welded joint 19. A magnetic armature 13 is provided in the above component. This magnetic armature has a pressure balancing groove or an angular cross section on its wall, as in FIG. Thereby, the balance of hydraulic pressure in the valve is ensured without being disturbed. As already mentioned in connection with FIG. 1, the magnetic armature 13 and the magnetic core 25 are formed as cold extruded press parts. For this purpose, the material of the identification code X8Cr17 or the material of the identification code X6Cr17 instead is suitable. The sleeve-shaped valve casing 3 is in particular made of 1.43.03 class austenitic steel. The same material is used for the bowl-shaped valve seat-housing 7. This material selection also applies to the above-described sleeve component of the solenoid valve shown in FIGS. In the solenoid valve of FIG. 2a, the edge 20 of the bowl-shaped valve seat-housing 7 is directly fixed to the valve support 6 by external caulking. The bowl portion of the valve seat-container 7 includes at least one radial hole and an axial hole, as in all the previous embodiments. In this case, a hole arranged along the longitudinal axis of the valve is formed in the valve seat-housing 7 for the valve closing member 9 by a stamping method, and penetrates the valve seat-housing 7 laterally with respect thereto. The hole is generally formed as a blind hole. Thereby, in the opened valve switching position, a pressure medium connection is made between the holes of the valve support 6 below and above the valve closing member 9. As the valve closing member 9, a sphere that is caulked and fixed in the magnetic armature 13 is used. The sphere is pressed against the valve seat surface of the valve closing body 9 under the action of the return spring 8 between the magnetic armature 13 and the magnetic core 25. Sealing of the bowl-shaped valve seat-housing body 7 in the stepped hole of the valve support body 6 can be performed by an O-ring 28 disposed between the valve seat-housing body 7 and the valve support body 6. Since the ring filter 29 extends along the valve seat-housing 7 to the O-ring 28, the O-ring 28 is additionally held before the original assembly in the stepped hole of the valve support 6. Some are protected during transportation. The solenoid valve is sealed and fixed only to the outside through a simple outer crimp in the valve support 6. On the other hand, the lower seal in the valve support 6 made by the O-ring 28 consists of a passage opening into the valve support 6 below the valve closing member 9 and a transverse passage at the height of the ring filter. Prevent short circuit of the flow between. The magnetic core 25 is press-fitted into the open area of the sleeve-like valve casing 3 like a plug and is permanently fixed by a weld seam after the necessary adjustment. Protrusions between the magnetic core and the magnetic armature, which can be provided on the magnetic core 25 or the magnetic armature 13, prevent so-called magnetic armature adhesion. As shown in the figure, the magnetic armature 13 is provided with a slot for space-saving accommodation and guidance of the return spring. All the above parts are in coaxial position.
[0019]
The different details will now be described with reference to FIG. 2a. This detail is the alternative or supplement shown in FIG. 2a.
[0020]
FIG. 2b shows a detailed variant of the valve casing 3 based on the solenoid valve of FIG. 2a. The sleeve-like section of the valve casing extends below the valve closing member 9 where the bowl-shaped valve seat-housing 7 is accommodated. The valve seat-housing body is not welded to the valve casing 3 as shown in FIG. 2A, and is press-fitted to a stopper on the step portion of the valve casing 3. In this range, when the cutting edge-shaped protrusion 31 of the valve casing 3 extends into the passage connection port on the lower side of the valve support 6, the valve casing has a metallic seal if desired or necessary. Can occur. This seal is shown in the left half of the cross section according to the illustration. On the right side of the valve longitudinal axis, the O-ring 28 already shown in FIG. 2a is shown as sealing means. However, this requires additional costs. An annular portion 32 crimped to the valve support 6 is welded to the valve casing 3 to seal and secure the valve.
[0021]
FIG. 2c shows a two-part embodiment in the form of an edge bend in both sleeve portions. In this case, the outer edge 20 of the edge bend joint simultaneously forms the crimping range of the electromagnetic valve in the valve support 6. All other details are consistent with those shown in FIGS. 2a and 2b.
[0022]
FIG. 2d shows a solenoid valve that is closed in the basic position. This solenoid valve has a function expansion part in the form of a so-called two-stage valve. For this purpose, the valve closing member 9 attached to the magnetic armature 13 is not directly mounted on the valve seat-housing body 7 that is caulked to the valve support 6, but is guided so as to be movable within the valve seat-housing body 7. The second valve seat-placed on the container 7 '. A valve spring 24 is compressed between the two valve seats-housings 7 and 7 '. When the magnetic armature 13 is excited, if pressure balance occurs on both sides of the valve seat-housing body 7 ', the valve seat-housing body 7' formed as an intermediate bowl-shaped member is caused to act as the magnetic armature 13 by the action of the valve spring. Follow the movement. Thereby, the inner valve-container 7 ′ remains on the valve closing member 9 of the magnetic armature 13, so that the relatively small valve seat hole remains closed by the spherical valve closing member 9. The pressure medium connection between the vertically opened pressure medium passage and the horizontally opened pressure medium passage is forced over a relatively large valve seat cross section in the energized state of the magnetic armature 13. This valve seat cross section is provided between both valve seat-housing bodies 7, 7 '. When the hydraulic pressure generated above the valve closing member 9 is larger than the hydraulic pressure below the valve closing member 9, the sealing surface of the inner valve seat-housing body 7 ′ is also excited when the magnetic armature 13 is excited. Is pressed against the outer valve seat-housing 7. Thereby, a relatively small valve seat hole in the inner valve seat-housing 7 ′ is opened exclusively by the valve closing member 9. Since the outer and inner valve seat-housing bodies 7, 7 'are formed as cold-extrusion press parts or deep drawing parts, very small, easily and precisely manufactured parts are inserted into the housing holes of the valve support 6. Is done. Similar to the outer valve seat-housing 7, the inner valve seat-housing 7 ′ also includes a roughly sized pressure medium hole 26 and a sliding surface within the pot-shaped extension. Thereby, reliable guidance of the inner valve seat-housing 7 is ensured.
[0023]
3 differs from the most similar valve structure of FIG. 1c in that it comprises a hollow cylindrical valve casing 3 that is somewhat shortened in length. In the hollow chamber 16 at the lower end of the valve casing, a sleeve body 22 formed as a deep drawing part is press-fitted. The sleeve body is provided on the one hand with a valve seat-shaped part at the end facing the valve closing member 9 and on the other end with another valve-seat-shaped part for the check valve 10 at the opposite end. In order to hold the check valve 10 so as not to fall and position the check valve, a sleeve portion 35 is inserted into the pressure medium hole 27 that has entered the sleeve body 22 from below. This sleeve portion has the function of a fixed orifice by an open cross section that is selected to be small in this embodiment. The sleeve portion 35 has an end projecting in the axial direction and the radial direction outside the press-fitting length in the sleeve body 22. The spherical check valve 10 is held between the protruding end portion and the expanded range of the sleeve body 22 having the valve seat shape portion. In the illustrated embodiment, the radially projecting end is shown as a tongue 36 of a sleeve portion 35 formed as a deep drawn part. The sleeve portion 35 thus forms a preassembled unit with the check valve 10 and the sleeve body 22. This unit is press-fitted into the hollow chamber 16 resembling a passageway, as much as necessary to adjust the valve stroke. The bypass hole 12 shown in FIG. 1c extends as a longitudinal groove into the hollow chamber 16 along the outer periphery of the sleeve body 22 within the press-fit connection range. Since the bowl-shaped filter 11 is fitted to the end portion of the stepped sleeve body 22 protruding from the sleeve portion 35, the liquid is not leaked. All the unexplained details of the valve of FIG. 3 are consistent with the valve description of FIG. 1c or one of the variants of FIG. 1a, 1b, 1d or 1e.
[Brief description of the drawings]
FIGS. 1a to 1e show a preferred embodiment for forming a solenoid valve that opens in a basic position.
2a to 2d show various structural embodiments of a solenoid valve closing in a basic position. FIG.
FIG. 3 is a diagram showing a modification of the electromagnetic valve shown in FIGS. 1a to 1e.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Valve sleeve 2 Adjustment pin 3 Valve casing 4 Valve protruding rod 5 Shoulder part 6 Valve support body 7,7 'Valve seat-container 8 Return spring 9 Valve closing member 10 Check valve 11 Pot-shaped filter 12 Bypass hole 13 Magnetic armature 14 Transverse passage 15 Hollow chamber 16 Hollow chamber 17 Caulking portion 18 Accommodating hole 19 Step portion 20 Edge portion 21 Weld connection portion 22 Sleeve body 23 Protrusion 24 Valve spring 25 Magnetic core 26 Pressure medium hole 27 Pressure medium hole 28 O-ring 29 Ring Filter 30 Projection 31 Projection 32 Annular portion 33 Valve seat hole 34 Stopper 35 Sleeve portion 36 Tongue piece

Claims (8)

A valve projecting rod (4) guided in the valve casing (3, 25) and provided with a valve closing member (9) and facing the valve closing member (9) and independently with the valve casing (3, 25) A valve seat-container (7) forming a handleable subassembly and a magnetic armature (13) for operating the valve stem (4), the magnetic armature on the valve casing (3, 25) it is electromagnetically operable by arranged the valve coil, in particular an electromagnetic valve for slip-controlled hydraulic brake system, a magnetic armature (13) is formed as a cold extrusion pressed parts, a valve housing (3 , 25) in the solenoid valve is formed as a deep drawn part or cold extrusion pressed part, the valve housing (3) is provided with an end section having a guide surface (3b), the valve seat on the end sections - housed (7) is fitted, and the valve seat-housing body (7) is shaped like a bowl, and its edge (20) is caulked (17) by the housing hole (18) of the valve support (6). ) Is fixed to the step (19) .   2. Solenoid valve according to claim 1, characterized in that the magnetic armature (13) is made of a material with the identification code X8Cr17 or X6Cr17.   The valve seat-container (7, 7 ') is formed as a deep drawing part made of a thin-walled metal plate, and a pressure medium hole (27) is defined by a stamping method at the bottom of the bowl of the deep drawing part. 2. A solenoid valve according to claim 1, wherein a valve seat is formed.   The valve seat-housing body (7) accommodates the bowl-shaped filter (11) along its wall, and this filter covers the pressure medium hole (26, 27) formed in the valve seat-housing body (7). The solenoid valve according to claim 3, wherein the solenoid valve is provided.   2. Solenoid valve according to claim 1, characterized in that the part of the valve casing (3) forming the magnetic core (25) is formed as a cold extruded press part, in particular according to the material identification code X8Cr17 or X6Cr17.   The valve stem (4) is molded into a thin-walled pipe part as a rotary aging part or a deep drawing part, and in the end part of the pipe part facing the valve seat-housing (7), a valve closing member ( 9. The solenoid valve according to claim 1, wherein 9) is held.   The adjusting pin (2) is press-fitted into the area of the tubular valve rod (4) facing the magnetic armature (13), and the end of this adjusting pin protruding from the valve rod (4) is the magnetic armature ( The electromagnetic valve according to claim 6, which is supported by 13).   7. The solenoid valve according to claim 6, wherein a return spring (8) is compressed between the valve rod (4) and the valve seat-housing body (7).

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