KR100642022B1 - Solenoid valve, especially for hydraulic brake systems with slip control - Google Patents

Abstract

Solenoid valves, especially for hydraulic brakes with traction control

According to the present invention, the valve tappet 4 guided in the valve housings 3 and 25 while exposing the valve closing member 9 and the valve closing member 9 face to the front and the valve housing ( 3, 25 together with a valve-seat-bearing member 7 forming an independent subassembly, and a valve coil actuating the valve tappet 4 and arranged on the valve housings 3, 25 In particular, it relates to an solenoid valve for a slip-controlled wheel brake with an amateur 13, which can be employed. The armature 13 is designed as a cold extrusion molded part, and the valve housings 3 and 25 are designed as a deep drawing molded part or a cold extrusion molded part.

Description

Solenoid valves for hydraulic brakes, especially with slip control {SOLENOID VALVE, ESPECIALLY FOR HYDRAULIC BRAKE SYSTEMS WITH SLIP CONTROL}

The present invention relates to a solenoid valve for a hydraulic brake device, in particular with a traction control function, according to the known part of the claims of the present application.

The valves of this type for regulating the flow of fluid in slip-controlled hydraulic brake devices disclosed in the prior art are actually used in many places.

DE 19837207 A1 discloses a solenoid valve for a slip-controlled hydraulic brake device, which is open at the start of operation, which is manufactured by turning steel and wedges. It is provided with a cartridge type valve housing, which is preferably inserted into the block-shaped valve fitting member by way of the method. The valve plate forming the valve seat is preferably turned from a steel material and made into a relatively solid component, and is supported by the lower end of the valve housing in a wedge manner. A valve tappet operating in conjunction with the valve seat is a solid shaft shaped part consisting of a solid cylinder which is guided within the valve housing and connected to an armature. It is supported on one side of the armature, which is guided along the valve housing in the region of the valve sleeve. Along the same axis as the valve tappet axis, a so-called pull-back spring is provided, which pushes the valve tappet with an adjustable bushing on the armature side at the time of starting operation of the solenoid valve. The valve tappet is kept spaced from the valve seat.

DE 19727654 A1 also discloses a solenoid valve which is closed at the start of operation. Unlike the valve of DE 19808826 A1, the valve tappet cut from the solid body, which is not opened and closed at the start of operation, is assembled with the armature to form a basically independent sub-assembly. This subassembly is oriented in the valve seat direction by a pressure spring supported on a magnetic core to keep the valve in the closed state at the time of starting operation of the solenoid valve described above.

A disadvantage of the solenoid valve is that a relatively broad manufacturing process is required not only for the production and implementation of the entire functional unit in the valve-bearing member, but also for the production of the individual components constituting the valve.

Accordingly, the present invention provides an solenoid valve which is open or closed at the start of operation, which provides a solenoid valve which is substantially reduced in its manufacturing process while ensuring functional safety and maintaining a relatively simple and compact configuration. For the purpose of

According to the invention, this object is achieved through a solenoid valve according to the features of claim 1 herein.

1A to 1E show a suitable embodiment of the solenoid valve which is open at the start of operation.

2A to 2D show various embodiments of the solenoid valve closed at the start of operation.

FIG. 3 shows an embodiment of the solenoid valve shown in FIGS. 1A-1E.

What the display number in the drawing shows is as follows.

1.valve sleeve 2.adjustment pin 3.valve housing 4.valve tappet

5. Shoulder 6. Valve support 7, 7 'valve seat member

8. Pull-back spring 9. Valve-closing member 10. Return valve

11. Minute-shaped filter element 12. Bypass opening 13. Amateur

14. Lateral flow path 15. Hollow space 16. Hollow space

17. Wedge 18. Location hole 19. Stair 20. Tip 21. Weld seam 22. Sleeve member 23. Nose 24. Valve spring 25. Magnetic core 26. Fluid passage hole 27 Fluid through hole 28.O-ring

29. Ring-shaped filter 30. Protrusion 31. Extension 32. Annular

33. Valve-seat opening 34. Stop 35. Sleeve element 36. tongue

According to the dependent claims herein, a suitable embodiment of the present invention is provided, which will be illustrated and described in more detail in connection with the additional features and advantages of the invention shown in the various figures of FIGS. 1A-3.

With reference to FIG. 1A, the basic design specification of the solenoid valve opened at the time of operation start is demonstrated. Referring to the cross-sectional view of the solenoid valve of FIG. 1A, at both ends of the bush-shaped valve housing 3, a guide surface 3a and a minute portion for supporting a dome-shaped valve sleeve are shown. (Iii) Guide surfaces 3b for supporting the valve-seat-equipped member 7 of the shape are formed on opposite end portions thereof. Thus, the valve housing 3 becomes a proper center member for the parts, and at the same time, functions as a magnetic core 25. In order to manufacture the parts at low cost, the valve housing 3 is designed as a cold extrusion molded product, the valve sleeve 1 and the branch-shaped valve-seat fitting member 7 are designed as a deep drawing molded product, and the stamping method is used. Through a stamping process, a seating surface for the valve-closing member 9 and the return valve 10 mounted on the valve tappet 4 at the bottom of the branch-shaped valve-seat-bearing member. To form. With respect to the valve tappet 4, designing with a thin walled sleeve part, which enables precise manufacturing at low cost by means of rotary single contact or deep drawing, makes another design specification useful in terms of manufacture and function. The simple outer shape of the thin-walled valve tappet 4 particularly favors the placement of the pull-back spring 8 supported by the valve tappet about the same axis as the valve tappet 4. One end of the pullback spring winding is supported on the slope extension of the lifter shaft, and the other end of the pullback spring winding is supported on the bottom of the split-shaped valve-seat providing member 7. In the configuration shown, the actual valve-closing member 9 is a steel ball that is surrounded by the tip of the valve tappet 4 in a manner of being picked up by a forceps. Further, the above-described return valve 10 is located far from the valve-closing member 9 at the bottom of the split-shaped valve-seat-bearing member 7 and is also made of steel balls. In the bypass opening 12 which becomes the second valve-seat at the bottom of the branch-shaped valve-seat-bearing member by means of the powder-shaped filter member 11 pressed against the member 7 and extrapolated. The position is fixed. The adjustment pin 2 protrudes in the direction of the armature 13 from the inside of the valve tappet 4. The adjusting pin 2, which has a triangular cross-sectional shape in the cross-sectional view taken along the AA line, has a polygonal side shape, is pressed into a tappet pipe and moved in a lifter pipe. The residual air gap in the armature can be adjusted.

In addition, once the adjustment of the adjustment pin 2 is completed, all the parts are added to their respective positions in the valve tappet 4 in a manner that provides adequate clearance and / or no clearance at all. Note that it can be fixed.

Another factor contributing to the reduction of the manufacturing cost of the solenoid valve is that, on the drawing, the armature 13 extending in the valve sleeve 1 above the valve housing 3 functioning as a magnetic core is made into a cold-extruded molded article. will be. In addition, the amateur can also be made to have a polygonal side shape. It is desirable to make the armature adjustable in the valve sleeve 1 regardless of the position of the valve tappet 4. Thus, the armature 13 and the valve tappet 4 are formed as mutually independent parts that are connected as members that transmit force in the axial direction, but operate independently of one another in the radial direction. Since the valve tappet 4 is basically designed in a tubular shape, and the adjustment pin 2 and possibly the armature 13 also have a polygonal side shape, the lateral flow path portion The pressure compensation to the hollow spaces 15 and 16 arranged on both sides of the valve housing 3 inside the valve tappet 4 and the valve sleeve 1 with the passages is not restricted. Is done without. In fixing the solenoid valve formed by the cartridge system to the block-shaped valve support 6, the fixing means is the wedge 17 which is a part designed as the shoulder part 5 in the area | region of the valve housing 3. Since the solenoid valve is only a portion having a relatively thick wall near), the solenoid valve has a valve support 6 in a primarily playable manner by an axial wedging force acting on the valve support 6. Is coupled to the position reference hole (18). The position reference hole 18 is designed as a bore consisting of a plurality of stages, and the tip portion 20 of the branch-shaped valve seat assembly 7 is provided with a shoulder portion 3 of the valve housing 3. ) Is firmly fixed to the step portion 19 of the valve support 6 in a wedge manner (that is, to provide oil tightness). An extension 31 extending into the branch-shaped valve-seat-bearing member 7 and having a guide surface 3b on the valve housing 3 has a corresponding component associated with the branch-shaped filter member 11. And before the return valve 10 included therein is inserted into the valve support 6, first the valve-seat accommodating member 7 can be safely assembled and handled on the valve housing 3. For example, the valve sleeve 1 is not only pressed and extrapolated to the cylindrical protrusion formed with the guide surface 3a in the valve housing 3, but also permanently coupled to the valve housing by the welding seam 21 when adjustment is completed. do. Of course, it can be combined by other methods of non-free and free type, not by the said welding seam. Except for the return valve 10 arranged at the edge of the valve, all the other components described above are arranged with the longitudinal axis of the valve as a common axis.

A modified embodiment of the solenoid valve according to FIG. 1A will be described, including different parts in detail with respect to the embodiment according to FIG. 1A. Details that are not described with respect to each modified embodiment correspond to the embodiment of FIG. 1A, and refer to the foregoing.

FIG. 1B shows the solenoid valve with a separate sleeve member 22 press-fitted into the split-shaped valve-seat-bearing member 7, unlike in FIG. 1A, which sleeve-22 is valve-closed. It has a conical sealing surface that faces in front of the member 9 and acts as a valve seat. Unlike in FIG. 1A, in FIG. 1B the tubular-shaped valve tappet 4 is in direct contact with the front end face of the armature 13, so that the sleeve member 22 has an adjustment pin 2 which has been described in connection with FIG. 1A. By performing the function of Amateur, the residual air gap is adjusted.

Also in the embodiment of the solenoid valve according to FIG. 1C, the sleeve member 22 shown in FIG. 1B is used, but the sleeve member is directly press-fitted into the valve housing 3, and the bottom of the filter member in the valve housing. Is different in that direction, and therefore, unlike in FIGS. 1A and 1B, the valve-seat providing member 7 becomes part of the valve housing 3.

In close comparison with the embodiment of FIG. 1B, the embodiment of FIG. 1D is a solenoid valve in which the valve-seat-bearing member 7 is formed with a particularly narrow sleeve-shaped portion in the region of the sleeve member 22. The minute-shaped filter element 11 slides on its valve-seat-bearing member. Both the return valve 10 and the bypass flow path portion 12 associated with the return valve are exquisitely included in the filter split-shaped filter member 11. The valve-seat-bearing member 7 is a radial wedge bent toward the guide surface side of the valve-seat-bearing member 7 with a thin wall from the outside-the nose 23 directed towards the extension 31 in this cross section. Can be fixed to the valve housing (3).

All of the aforementioned solenoid valves can perform the function of the pressure control valve in a fairly simple manner, which will be described in detail with reference to FIG. 1E. Since the tubular-shaped valve tappet 4 has a dimensionally allowance including the cylindrical hollow portion, it is movable in the axial direction without fixedly arranging the valve-closing member 9 as described above. Can be placed. To that end, the valve-closing member 9, which is in the form of a plunger, is inserted into the hollow portion from the upper end of the valve tappet 4, so that the conical stopping shoulder of the valve-closing member 9 is provided. Contacting the tapered tip of the valve tappet 4 and at the same time the valve-closing member protrudes out from the open tip region of the valve tappet 4, with the sleeve member 22 or valve-seat under the pressure of the spring. Face the member 7. The opening pressure plays a decisive role in the function of the pressure control valve and is also determined by the valve spring 24, which is a stop and valve-closing member press-fit into the valve tappet 4. Forced insertion between 9). Thus, when the excited valve is in the closed position, the valve-closing member 9 is strong enough to provide oil tightness to the valve-seat-equipped member 7 in the manner disclosed in the prior art. In close contact with the valve-seat-bearing member 7 when the hydraulic pressure under the valve-seat-bearing member 7 is greater than the pressure exerted on the valve-closing member 9 by the spring 24. The function of the pressure control valve is exerted by rising from and spaced apart.

Here, with reference to FIG. 2A, the essential features of the present invention will be clearly described based on the solenoid valve being closed at the time of normal operation. Next, on the basis of Figs. 2b to 2d, a modified embodiment of such a valve is described.

Like the valve according to FIGS. 1A-1E, the solenoid valve according to FIG. 2A is coupled to an armature 13 made of a cold-extruded molded article, a magnetic core 25 made from a cold-extruded molded article, and a valve housing 3. And a branch-shaped valve-seat fitting member 7. As in the above-described embodiment, the parts that can be manufactured as thin-walled sleeve parts are designed as deep-drawn molded parts or possibly as rotatable parts. In this connection, in figure 2a a sleeve shaped valve housing 3 designed as a deep-drawn molded article is shown. When the magnetic core 25, the valve housing 3, and the valve-seat providing member 7 are manufactured as deep-drawn molded products, no other machining process is required, and thus forging can be performed in a simple manner. And when the armature 13, the valve housing 3, and the magnetic core 25 are manufactured from a cold-extruded molded product, the protrusion 30 in the manufacture of the magnetic core 25, the fluid through-hole in the manufacturing of the valve-seat-bearing member, flax When manufacturing the tour, it is possible to simplify the manufacturing step, such as manufacturing the valve closing member. This simplifies the manufacturing process and the valve assembly and eliminates the need for many manufacturing processes in the manufacturing method, making it possible to simply maintain the accuracy of the components' quality and dimensions and reduce manufacturing costs. In this way, the valve-seat-bearing member can be stable and rigid, supporting the valve continuously even at high pressures. The both ends of the valve housing 3 form guide surfaces 3a and 3b, one side of which is bounded by a magnetic core 25, and the other side of which is a split-shaped valve seat assembly. The boundary is determined by (7). The two parts 25, 7 are preferably permanently joined to the sleeve-shaped valve housing 3 by means of a welded seam 19. As described above, in order to ensure a free compensation for the hydraulic pressure in the valve, between the two parts, as shown in Fig. 1, an armature having a pressure compensation groove or an angular side in the area where the winding is wound ( 13) As described in connection with FIG. 1, the armature 13 and the magnetic core 25 are designed as cold-extruded molded parts, where such classification code is X8Cr17 (code No. of material determined by the German National Standards Institute). A material with a material or classification code of X6Cr17 (code No of the material set by the German national standards body) is suitable. The sleeve-shaped valve housing 3 is preferably made of austenitic steel according to classification code 1.43.03. The same material is also used for the branch-shaped valve-seat-bearing member 7, which is also used for the sleeve component of the solenoid valve according to FIGS. 1A to 1E, as described above. The solenoid valve according to FIG. 2a is directly coupled to the valve support 6 by an outer wedge at the tip 20 of the split-shaped valve receiving member 7. As in all the embodiments described above, the branch-shaped valve seat assembly 7 has at least one radial and axial bore, the longitudinally arranged bore of the valve being a valve closing member. It is designed to be formed by a stamping method to perform the function of the substantially valve-seat-bearing member 7 with respect to (9), and an opening penetrating the valve-seat-bearing member 7 in a direction perpendicular to the hole is provided. When the valve is in the open position, it is designed as a hole for communicating fluid between two flow path portions in the valve support 6 located above and below the valve-closing member 9. As the valve-closing member 9, the action of the pullback spring 8 arranged between the armature 13 and the magnetic core 25 using a ball inserted into the armature 13 in a wedge manner. By means of this, it is preferable to press the valve-seat surface of the valve seat seat member 7. The minute-shaped valve seat fitting member 7 is, in a stepped shape in the valve support 6, an O-ring 28 arranged between the valve seat fitting member 7 and the valve support 6. Is sealed by. The ring-shaped filter 29 extends along the valve-seat-bearing member 7 to the O-ring 28, so that the O-ring is not actually assembled into the stepped portion inside the valve support 6. Perform additional protection in supporting and / or transporting the ring. The solenoid valve is sealed and fixed in the valve support 6 by only a simple outer wedge, which is sealed against the outside, but the lower seal formed inside the valve support 6 by an O-ring 28 is provided. This prevents the occurrence of flow due to leakage between the flow passage portion leading to the lower portion of the valve-closing member 9 and the transverse flow passage portion at the top height of the ring-shaped filter. The magnetic core 25 is press-fitted into the open area of the sleeve-shaped valve housing 3 like a stop, and is completely fixed in position by the weld seam after completing the necessary adjustment work. Since the projection corresponding to one of the two components 13 and 25 is arranged between the magnetic core 25 and the armature 13, the fixation of the armature is prevented. In order to support and guide the pullback spring while saving space, the armature 13 is provided with a longitudinal opening corresponding to the shape of the pullback spring. All the parts are arranged to have a common axis.

Based on FIG. 2A, an embodiment that can be regarded as a modified embodiment or a supplemental embodiment thereof will be described.

FIG. 2b shows an embodiment in which the valve housing 3 is modified in detail on the basis of the solenoid valve according to FIG. 2a, in which the sleeve-shaped cross section extends below the valve-closing member 9. The branch-shaped valve seat assembly 7 is supported there, and the branch-shaped valve seat assembly 7 is coupled to the valve housing 3 by welding, as in FIG. 2A. Rather, it is coupled to the valve housing by press-fitting the offset stepped portion of the valve housing 3. When the blade-shaped extension 31 of the valve housing 3 extends from the engagement region to the lower flow path portion of the valve support 6, whether desired or not, as shown in the left cross section of the figure, a metallic seal is provided. Can be achieved. On the right side of the drawing centered on the longitudinal axis of the valve, the O-ring 28 previously described with respect to FIG. 2A is shown as an additional sealing element, but this incurs additional costs. An annular portion 32 inserted into the valve support 6 in a wedge manner is welded to the valve housing 3 to completely seal and fix the valve.

FIG. 2C shows an embodiment of a solenoid valve in which a flange is connected to two sleeves and at the same time the outer end 20 of the flange connection is wedge-inserted into the valve support 6. Details are as described for the embodiment of FIGS. 2A and 2B.

FIG. 2D shows a solenoid valve which is held in the closed state at the start of operation, which acts in the form of a so-called two-stage valve to perform an additional function. The valve-closing member 9 arranged thereon is not in direct contact with the valve-seat-bearing member 7 coupled to the valve support 6 in a wedge manner, but within the valve-seat-bearing member 7. It is in contact with the guided and movable second valve-seat attaching member 7 '. The valve spring 24 is disposed between the two valve seat mounting members 7 and 7 ', and when the armature 13 is excited, the valve seat mounting member 7' is provided. Pressure compensation on both sides of the valve ensures that the valve seat assembly 7 ′ in the middle part-like body moves along the behavior of the armature 13. Thus, the inner valve-seat providing member 7 'maintains contact with the valve-closing member 9 of the armature 13, and consequently, due to the ball-shaped valve-closing member 9, The opening of the small valve-seat remains closed. The communication between the fluid flow path portion in the vertical direction and the fluid flow path portion in the horizontal direction is such that when the armature 13 is in the excited state, the valve seat is arranged between the two valve-seat fitting members 7, 7 ′. Only through the large cross section. If the hydraulic pressure above the valve-closing member 9 is greater than the hydraulic pressure below the valve-closing member 9, even if the armature 13 is in the excited state, the inner valve-sheet providing member 7 'is the outer valve. -It is pressed by the seat providing member 7, but the opening of the relatively small inner valve-seat providing member 7 'is not pressurized by the valve-closing member 9. By designing the outer and inner valve-seat-bearing members 7 and 7 'as cold-extruded or deep-drawn molded articles, in particular, small parts that can be manufactured simply and precisely are inserted into the position reference hole of the valve support 6. Make it possible. As in the outer valve-seat-bearing member 7, in order to allow the inner valve-seat-bearing member 7 'to be guided safely, the sectional extension of the inner valve-seat-bearing member 7'. In the vicinity, the fluid hole 26 and the guide surface which are dimensionally relaxed are formed.

Unlike the valve specification according to FIG. 1C, the solenoid valve according to FIG. 3 has a hollow cylindrical valve housing 3 which is rather short in length. The sleeve member 22 is preferably designed as a deep-drawing molded article, the lower part of which is press-fitted into the hollow space 16, on one side of the valve-sheet facing the valve-closing member 9. A shape is formed, and on the other side, a valve seat is formed opposite the return valve 10. In order to keep the return valve 10 firmly in place without falling off, the sleeve part 35 is inserted into the fluid hole 27 passing through the sleeve member 22 from below, whose opening cross-sectional area is small and Since it is optional, as in the case of the previous embodiment, it performs the function of limiting the opening. The sleeve component 35 has, in addition to its insertion region, a tip portion projecting from the insertion region in the axial direction and the radial direction, respectively, between which the ball-shaped return valve 10 takes the form of a valve-seat. Supported by an extension of the sleeve member 22. In the illustrated embodiment, the radially protruding tip may be viewed as a tongue 36 of a sleeve part 35 of a deep-drawn molded article. Therefore, the return valve 10, the sleeve member 22, and the sleeve component 35 become one subassembly unit, and the hollow space portion 16 in the form of a narrow passage as needed for setting the valve stroke. Indented. Bypass opening 12, previously described with respect to FIG. 1C, extends into hollow space 16 along the side of sleeve member 22 as a longitudinal groove in the indentation region. The split-shaped filter element 11 is pushed toward the tip side of the sleeve part 35 protruding from the stepped portion of the sleeve member 22, whereby an immovable engagement is maintained in which oil is maintained. Details that are not described with respect to the invention according to FIG. 3 are the same as those described with respect to the valve according to FIGS. 1A, 1B, 1D or 1E, which is FIG.

Claims (9)

A valve tappet 4 which is guided in the valve housings 3 and 25 while exposing the valve-closing member 9, and faces the valve-closing member 9 in front and also the valve housings 3 and 25. Together with a valve-seat-bearing member 7 forming an independent subassembly, and the valve tappet 4 operating and also being electromagnetically excited by a valve coil arranged on the valve housings 3, 25. As an electromagnetic valve, in particular for a slip-controlled wheel brake, having an armature 13, which can be An electromagnetic valve, characterized in that said armature (13) is made of a cold-extruded molded article and the valve housing (3, 25) is made of a deep-drawn molded article or a cold-extruded molded article. The solenoid valve according to claim 1, characterized in that the armature (13) is made of a material complying with classification code X8Cr17 or X6Cr17. The guide face 3b is formed at the tip of the valve housing 3 so that the valve seat seating member 7 is pushed over and extrapolated, and the valve seat seating member 7 is divided into pieces. Iii) -shaped, wherein the tip (20) is coupled to the step (19) of the position reference hole (18) in the valve support (6) by a wedge (17). The valve seat fitting member (7, 7 ') is made of a molded article which is deep drawn from a metal coat having a thin wall, and stamped. And a valve seat for restricting the fluid hole (27) is formed at the bottom of the branch-shaped valve seat assembly. 5. A fluid hole according to claim 4, wherein a split-shaped filter member is supported along the wall of the valve-seat-bearing member 7, and the split-shaped filter member is formed in the valve-seat-bearing member 7. A solenoid valve characterized by covering (26,27). The solenoid valve according to claim 1, wherein the part of the valve housing (3) forming the magnetic core (25) is preferably made of a cold-extruded molded article according to classification code X8Cr17 or X6Cr17. 2. The valve tappet (4) according to claim 1, wherein the valve tappet (4) is molded into a tubular part having a thin wall from a rotationally welded molded article or a deep-drawn molded article, and the valve-closing member (9) is formed from the valve-sheet. The solenoid valve which is supported by the front-end | tip of the valve tappet which faces the provision member 7 in front. The valve tappet according to claim 7, wherein the adjustment pin (2) is press-fitted to the distal end of the tubular valve tappet (4) facing the armature (13) in front, and in the adjustment pin (2). The solenoid valve which protrudes from (4) is supported by the said armature (13). 8. The solenoid valve according to claim 7, wherein the pullback spring is fitted between the valve tappet and the seat seating member. 9.

Images