JP4603789B2 - Solenoid valve - Google Patents

Description

  The present invention relates to an electromagnetic valve (especially an electromagnetic valve for a hydraulic brake device of an automobile), which includes a valve member, a valve dome coupled to the valve member, and a longitudinal direction in the valve dome. An armature that is movably accommodated, a seat valve provided in a valve chamber located on the opposite side of the valve dome, and an armature that is guided in a longitudinal hole of the valve member so as to be movable in the longitudinal direction. A plunger for transmitting motion to the closing member of the seat valve, the plunger guiding the liquid coming from the seat of the seat valve and the valve dome by at least one passage of the plunger And a filter insert that belongs to the valve chamber and that is immovably disposed with respect to the casing. The filter member of the filter insert includes the valve seat and the pressure medium. Located between the exit It related to those of the formula.

  An electromagnetic valve (solenoid valve) known from DE 100 03 576 A1 is used as an outlet valve, for example in an electrohydraulic brake (EHB), the outlet valve being in a hydraulic unit. It is arranged downstream of the wheel brake cylinder provided. The valve member of the valve is connected to the armature chamber, and the armature is guided in the armature chamber so as to be movable in the vertical axis direction. The armature is coupled to the plunger, the plunger penetrates the valve member, the valve closing member is formed in the plunger, the valve closing member is disposed in the valve chamber, and the valve seat member It comes to cooperate with the valve seat. When such a valve is used as an outlet valve for an electrohydraulic brake, the problem is that when the pressure is rapidly reduced, i.e. when the brake is released rapidly, the valve is greatly swollen due to inadequate venting and is uncomfortable. Noise will be generated. In the prior art, in order to reduce noise generation, the plunger is guided in the valve member with a narrow play, and a plurality of vertical passages partitioned from each other are formed between the valve chamber and the armature chamber. This allows air present in the valve dome to be removed via the liquid flow. In the case of the known valve, a circular vortex, i.e. a circular vortex, is generated in the area of the valve seat and the closing member (valve chamber), and the vortex is trapped, i. Noise will be generated. In the prior art, the filter insert attached to the valve member in the valve chamber cannot prevent vortex generation.

Furthermore, from German Offenlegungsschrift 4,429,211 A1, an electromagnetic valve for an automotive slip-controlled hydraulic brake device is known, in which the valve seat member comprises a sleeve surrounding the valve seat. Yes. The sleeve cooperates with the end of the plunger at least over a predetermined stroke range to form a throttle, and the solenoid valve functions as a flow control valve. In this case, however, the valve chamber is not provided with a filter member for purifying the pressure medium flow.
German Patent Application Publication No. 10036576A1 German Patent Application Publication No. 4429211A1

  In order to avoid the disadvantages of the known art, in the present invention, the filter insert has a filter member and a cylindrical sleeve portion located inside the filter member, in other words, two joined at one end. It is formed as a heavy cylinder, i.e. a U-shaped ring in cross section, the sleeve part surrounding the valve seat and arranged coaxially to the valve seat, the peripheral wall section of the sleeve part being in the valve chamber It has entered. By such means according to the invention, the flow guidance in the valve chamber of the electromagnetic valve is improved and the generation of vortices in the area of the valve seat and closing member is effectively prevented, so that the bubbles are swirled. Is not trapped by the valve, assists quick venting and significantly reduces valve noise generation. Furthermore, the integration of the filter member and the sleeve portion into one component reduces manufacturing costs because there is no need for additional parts and assembly operations. Further, the constituent means of the present invention can be easily combined with conventional means for noise attenuation.

  By means of the constituent features of the dependent claims, a further advantageous construction and improvement of the electromagnetically actuated valve according to claim 1 is possible, which results in a particularly simple, easy to assemble and economical construction.

  The present invention will be described in detail with reference to the illustrated embodiments. The electromagnetically actuated valve 10 shown in FIG. 1 for a hydraulic brake system of a motor vehicle is substantially hydraulically mounted from two component units, ie in a stepped hole 11 of a valve block 12. It consists of a portion 13 and an electrical portion 14 fitted over the portion.

  The hydraulic part 13 has a valve member 16 and is provided with a vertical hole 17 through which the valve member passes. A valve dome 18 is attached to the valve member 16 on the electrical part 14 side. An armature 19 is accommodated in a valve dome (dome-shaped member) 18 so as to be movable in the vertical axis direction, and the armature (movable element) is provided with a groove 20 extending in the vertical axis direction (longitudinal direction).

  The valve seat member 22 is accommodated in the stepped hole 11 of the valve block 12, and the valve seat member is provided with a seal ring 23 disposed on the outer periphery. A seal ring separates the inflow hole 24 and the outflow hole 25 of the valve block 12. A filter disk 26 is arranged in the stepped hole 11 on the inflow hole 24 side. A valve seat member 22 having a vertical hole 27 is coupled to the valve member 16 using a sleeve 28. The sleeve 28 has a hole 29 in the peripheral wall.

  A sleeve 28 surrounds or defines a valve chamber 31 extending between the valve member 16 and the valve seat member 22. A filter insert 32 is accommodated in the valve chamber, and the filter insert (filter insert) will be described in detail later. The filter insert 32 slightly enters the large hole section 33 of the vertical hole 17 of the valve member 16. Following the hole section 33, a hollow conical transition 34 extends to the small diameter section of the longitudinal hole 17.

  A pin-shaped hollow plunger (rod or push rod) 36 is accommodated in the vertical hole 17 of the valve member 16. A plunger 36 extends from the armature 19 into the valve chamber 31. The plunger 36 is guided in the valve member so that it can move in the longitudinal direction with a narrow radial play over the entire length of the small diameter section of the longitudinal hole 17. The plunger 36 has four passages 37 separated (partitioned) from each other on the peripheral wall surface, and the passages (grooves) extend along the plunger 36 from the valve chamber 31 to the valve dome 18 (see FIG. 1 and FIG. 2). The passages 37 are arranged on the plunger 36 at a uniform pitch (indexing), and are curved concavely in cross section. The plunger 36 penetrates into the valve chamber 31, and the valve chamber 31 is based on a hollow conical transition 34, i.e. a reduced section 38 with a wedge-shaped cross section towards the plunger 36, which is good for the flow of the plunger 37. Is connected (connected).

  A closing member 40 for the seat valve 41 is arranged in the valve chamber 31 on the side opposite to the valve dome 18. The seat valve 41 has a hollow conical valve seat 42 formed in the valve seat member 22, and the valve seat communicates with the vertical hole 27 of the valve seat member 22. The closing member 40 has a cylindrical section 43 with a small diameter toward the valve seat member 22, and the section is a ball portion (sphere) arranged corresponding to the valve seat 42 via a sharp edge. (Part) 44. The closure member 40 includes a pin 45 on the opposite side of the valve seat, the pin extending coaxially with respect to the plunger 36 and engaging within the plunger with great radial play. That is, it has entered.

  A return spring 47 made of a compression coil spring is further arranged in the valve chamber 31, and the return spring is supported on the one hand by the valve seat member 22 and on the other hand by the closing member 40, so that the initial spring force (place Period stress). Under the action of the return spring 47, the closing member 40, the plunger 36, and the armature 19 support each other so as to be able to transmit force to each other, that is, come into close contact (contact) with each other. In FIG. 1, the seat valve 41 occupies the open position, and the closing member 40 causes the armature 19 to contact the valve dome 18, that is, the stopper, via the plunger 36 in the open position.

  As is clear from the enlarged sectional views of FIGS. 1 and 3 and the perspective view of FIG. 4, the filter insert 32 is formed as a U-shaped cross section (a donut-shaped member having a U-shaped cross section or a ring member having a U-shaped cross section). ing. In this case, the inner leg portion having a U-shaped cross section forms an annular sleeve portion 50, whereas the outer leg portion is formed as a ring-shaped filter member 51, and both leg portions are formed. Are rigidly connected to each other by a ring-shaped bottom plate 52 and are joined together in the illustrated embodiment. The integrally formed filter insert 32 is press-fitted to the pin-like additional portion (extension portion) 49 of the valve seat member 22 by the sleeve portion 50, whereby the sleeve portion 50 causes the valve seat 42 to be attached to the valve seat 42. Surrounds coaxially. The sleeve portion 50 is configured in the axial direction as follows: the peripheral wall section 53 coaxially surrounds the cylindrical section 43 of the closure member 40 and is funnel-shaped (hollow conical). A free end portion 54 arranged corresponding to the transition portion 34 enters the hole section 33 having a large diameter of the vertical hole 17 of the valve member 16. The diameter of the free end 54 of the sleeve portion 50 is configured to be smaller than the maximum diameter of the hollow conical transition 34 and larger than the minimum diameter of the transition. The filter member 51 has a window-like opening 56 formed between a plurality of webs (bridge portions) 55, and the opening is covered with a filter cloth 57. The filter member 51 of the filter insert 32 has a ring-shaped edge 58 on the free end side, the edge is supported by the valve member 16 in the axial direction, and the outer peripheral surface of the filter member is a sleeve. 28 is brought into liquid-tight contact. Therefore, it is reliably avoided that the liquid flows through the valve without being filtered. In this way, the filter insert 32 provides a filter function as well as a flow guiding function in the valve. Furthermore, the filter insert can be economically manufactured as an injection-molded product and can be easily incorporated into narrow spaces.

  An electrical portion 14 of the valve 10 surrounds a valve member 16 protruding from the valve block 12 as well as a valve dome 18 and an armature 19. The electrical portion 14 is composed of a winding frame 60 and an electrical winding (coil) 61, and the winding is surrounded by a casing 62 that includes a yoke ring plate 63 and guides magnetic flux. A valve member 16 is associated with the electrical portion 14 to form the magnetic pole core of the valve 10.

  The valve 10 can be operated by supplying a current to the electrical winding 61 to cause a magnetic force to act on the armature 19. The magnetic force moves the armature 19 toward the valve member 16. The movement of the armature is transmitted to the closing member 40 via the plunger 36. As a result, the seat valve 41 is switched from the open position shown in the figure to the closed position, and the ball portion 44 contacts the valve seat 42 in the closed position, or can be moved to any intermediate position by current control. When the seat valve 41 is opened, the inflow hole 24 of the valve block 12 is connected to the outflow hole 25. In this case, the liquid flows from the inflow hole 24 to the outflow hole 25 through the vertical hole 27 of the valve seat member 22, the valve seat 42, the valve chamber 31, the filter insert 32, and the hole 29 of the sleeve 28. The valve dome 18 communicates with the valve chamber 31 filled with liquid via a passage 37 of the plunger 36.

  When the brake device is filled with liquid for the first time, air is present in the valve dome 18. Such air is forced out of the valve dome 18 in the manner described below.

  When the seat valve 41 is opened from the closed position, the liquid jet flowing out from the valve seat 42 reaches the inside of the funnel-shaped contraction portion 38 of the valve chamber 31 that is positioned relative to the valve seat 42. This flow guide is aided by a tubular sleeve portion 50 surrounding the valve seat 42. From the funnel reduction 38, liquid reaches the valve dome 18 via at least one passage 37 and at least one groove 20 in the armature 19. The liquid then pushes away the air in the valve dome and entrains the air into the valve chamber 31 via another passage 37, and the mixture of liquid and air from the valve chamber passes through the outflow hole 25 to the valve. 10 is derived.

  The filter insert 32 is useful for good flow guidance based on the special shape of the tubular sleeve portion 50. That is, the peripheral wall section 53 of the sleeve portion 50 prevents vortex generation in the region of the pin-shaped section 43 of the closing member 40. A peripheral wall section 53 located concentrically with respect to the valve seat 42 limits the space around the pin-shaped closing member 40. Due to this space limitation, i.e., space reduction, the fluid flow is directed upward within the sleeve portion 50 and then toward the outside of the sleeve portion. Such a flow path avoids the generation of circular or annular vortices, i.e. circular vortexes, and in turn avoids the trapping of bubbles by vortices, so that the bubbles do not stay through the holes 29 in the sleeve 28. Quickly sent to the outside. As a result of such flow guidance, the overall tendency of the valve 10 to generate noise is significantly avoided. A sleeve portion 50 is arranged to correspond to the funnel-shaped transition 34 to achieve good air venting.

  The illustrated embodiments can be modified without departing from the spirit of the invention.

Longitudinal cross section of solenoid valve 1 is a cross-sectional view taken along line II-II in FIG. Enlarged view of the portion surrounded by the chain line circle III in FIG. 1 is an enlarged perspective view of the filter member of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Electromagnetic valve, 11 Stepped hole, 12 Valve block, 13 Hydraulic part, 14 Electrical part, 16 Valve member, 17 Vertical hole, 18 Valve dome, 19 Armature, 20 Groove, 22 Valve seat Member, 23 seal ring, 24 inflow hole, 25 outflow hole, 26 filter disc, 27 vertical hole, 28 sleeve, 29 hole, 31 valve chamber, 32 filter insert, 33 hole section, 34 transition part, 36 plunger, 37 Passage, 38 reduction part, 40 closing member, 41 seat valve, 42 valve seat, 43 section, 44 ball part, 45 pin, 47 return spring, 49 additional part, 50 sleeve part, 51 filter member, 52 bottom plate, 53 peripheral wall Division, 54 Free end, 55 web, 56 opening, 57 filter cloth, 58 edge, 60 reel, 61 winding, 62 casing, 63 yoke ring plate

Claims (8)

An electromagnetic type valve for the brake system of a motor vehicle hydraulic, valve member (16), said valve combined valve dome member (16) (18), the vertical axis direction to the valve dome (18) The armature (19) accommodated movably, the seat valve (41) provided in the valve chamber (31) located on the side opposite to the valve dome (18), and the valve member (16) longitudinal bore (17) is the vertical axis direction movably guided in by the armature movement is provided with a plunger (36) for transmitting to the closure member (40) of the seat valve (41), the plan jar (36) is supposed to be guided to the valve dome (18) by at least one passage of the plunger the liquid incoming (36) (37) from the valve seat (42) of the seat valve (41) And belonging to the valve chamber (31) and a casing Equipped with a filter insert (32) disposed immovably against, positioned between the filter member (51) said valve seat (42) and the pressure medium outlet (25) of the filter insert (32) and in it form are those, wherein the filter insert (32) has a cylindrical sleeve portion (50) located in the interior of the filter member (51) and said filter member (51), wherein sleeve portion (50) is surround said valve seat (42) and the valve seat (42) is arranged coaxially with respect to said circumferential wall section of the sleeve portion (50) (53) said valve chamber ( 31) and the longitudinal length of the peripheral wall section (53) extending beyond the valve seat (42) in the longitudinal axis of the sleeve portion (50) is the valve seat (42). Larger than the diameter) The vertical hole (17) for guiding the plunger (36) is transferred to the valve chamber (31) via a funnel-shaped enlarged portion (34), and the enlarged portion (34) The peripheral wall section (53) of the sleeve portion (50) is located opposite to one side of the enlarged portion (34), while the plunger (36) is on the other side. A plurality of the passages (37) leading to the armature chamber are connected along the outer periphery, and the free end (54) of the peripheral wall section (53) of the sleeve portion (50) is connected to the plunger (36). An electromagnetic valve, characterized in that it ends with an interval in the longitudinal direction with respect to the funnel-shaped enlarged portion (34) of the vertical hole (17) . Said filter insert (32) has a cross-section of approximately U-shaped, the inner leg of the U-shape of the cross section forms a sleeve portion of the circular cylindrical (50), the outer leg forms a ring of the filter member (51), claims the sleeve portion (50) and said filter member (51) is mutually rigidly connected by a ring-shaped bottom plate (52) 1. The valve according to 1. It said sleeve portion (50) comprises seat valve (42) of the valve seat member (22) valve as claimed in claim 1 or 2, wherein is closely attached to the filter insert (32). The filter member ring-shaped free edge (51) (58), said valve member (16) in which is supported claims 2 or 3 valve according of the filter insert (32). The ring-shaped free edge (58), said valve chamber (31) and the pressure medium outlet hole (25) as defined in Claim 4 valve according forming a seal between. 6. Valve according to any one of claims 1 to 5, wherein the filter insert (31) is formed as an integral injection molded part. The free end (54), the claims have a diameter between the maximum diameter and the minimum diameter of the funnel-shaped enlarged portion (34) of the peripheral wall section of said sleeve portion (50) (53) 1. The valve according to 1 . The valve seat member (22) is pin-shaped additional portion formed of the valve seat (42) has a (49), the filter insert (32) is fixed to the additional unit (49) The valve according to any one of claims 3 to 7 .

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