Source: https://patents.google.com/patent/DE4111987C2/en
Timestamp: 2020-06-01 23:59:54
Document Index: 764439399

Matched Legal Cases: ['art 46', 'art 46', 'art 46', 'art 46', 'art 46', 'art 46']

DE4111987C2 - Solenoid valve - Google Patents
DE4111987C2
DE4111987C2 DE19914111987 DE4111987A DE4111987C2 DE 4111987 C2 DE4111987 C2 DE 4111987C2 DE 19914111987 DE19914111987 DE 19914111987 DE 4111987 A DE4111987 A DE 4111987A DE 4111987 C2 DE4111987 C2 DE 4111987C2
DE19914111987
DE4111987A1 (en
Werner Dipl Ing Brehm
1991-04-12 Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
1991-04-12 Priority to DE19914111987 priority Critical patent/DE4111987C2/en
1992-10-15 Publication of DE4111987A1 publication Critical patent/DE4111987A1/en
1995-01-12 Publication of DE4111987C2 publication Critical patent/DE4111987C2/en
The invention is based on an electromagnetic valve according to the preamble of the main claim. Such a solenoid valve is known for example from DE-GM 87 11 602.
With such electromagnetic valves goes a significant portion of the achievable Magnetic force lost because either at the working air gap the maximum possible pole area is used, or at the secondary air gap there is a high magnetic resistance, which is caused by that the secondary air gap in favor of a large pole face at the working air gap is kept short. As a result, this short secondary air gap high eccentricities are caused by manufacturing technology Lateral forces, the corresponding frictional forces on the anchor bearing cause and thus further reduce the magnetic force.
In U.S. Patent 4,639,704 there is also an electromagnetic actuator described in which the magnetic armature in one hollow cylindrical guide insert made of plastic. This has several axially extending longitudinal grooves on its inside the pressure medium flow past the armature or the valve body can. However, such a guide insert is expensive to manufacture and the design and size of the longitudinal grooves is primarily dependent from the pressure medium flow.
Furthermore, an electromagnetic actuator is in DE-GM 83 17 753 described, which has a cylindrical anchor, the connected to a plunger via a shoulder of smaller diameter is. This gradation in the area of the pole piece does, however significant part of the theoretically usable pole area lost.
The invention is based on the object of an electromagnetic valve to further develop according to the genus of the main claim that both large magnetic forces can be achieved with a small size, as well as friction losses due to eccentricities of the magnet armature and Contamination of the magnetic armature guide can be largely avoided. This is according to the invention in the characterizing part of the claim 1 means achieved.
The electromagnetic valve according to the invention has the advantages that both a large pole face at the working air gap as well as a long one Secondary air gap with low magnetic resistance are formed.
This makes the theoretically achievable magnetic force very large portion made usable. The eccentricity of the magnet armature or the secondary air gap is very small, so that only a small cross forces occur that lead to friction losses. By inventing Design of the magnetic circuit according to the invention can generate high magnetic forces can be achieved with a small space requirement, without complex dimensions took such. B. adjustment with adjusting screws are required. In addition, the guidance of the magnet armature is relatively insensitive against dirt, which occurs especially when derar term solenoid valves z. B. in automatic transmissions from motor vehicles witnesses are installed below the oil level.
Two embodiments of the invention are in the following Description and drawing explained in more detail. The latter shows in
Fig. 1 shows a longitudinal section through a first embodiment of the electromagnet valve, in
Fig. 2 shows a section along II-II of FIG. 1.
Fig. 3 shows a longitudinal section through a second embodiment example.
The solenoid valve 15 illustrated in FIGS. 1 and 2 has an approximately cup-shaped, made as a deep-drawn part Magnetman tel 10 with openings 11 on the outer circumference and a retracted, cylindrical sleeve 12 in the bottom 13. At the edge of the open end face of the magnetic jacket 10 , a mounting tab 14 is bent approximately perpendicular to the outside lig. In the magnetic jacket, a magnetic coil 16 including coil body 17 made of plastic is used, so that it protrudes with one end into the annular space 18 formed by the sleeve 12 and the outer magnetic jacket 10 a. The coil body 17 has in its cylindrical cavity 19 a circumferential annular shoulder 20 which forms an annular groove 21 with the sleeve 12 of the magnetic casing. A crimp contact 22 is embedded in the end face of the coil body 17 facing the open side of the magnet jacket, which serves for the electrically conductive connection of the magnet coil.
On the bottom 13 of the magnetic jacket 10 facing side of the ring shoulder 20 of the coil body, the shoulder 24 is supported from a stepped, approximately cup-shaped guide insert 25 , the opening of which points to the open side of the magnetic jacket. The guide insert 25 is made as a deep-drawn part made of non-magnetic material and, with its portion 27 closed by a base 26 , projects into the sleeve 12 in such a way that the inside of the base 26 is approximately flush with the outside of the base 13 of the magnetic casing 10 . From section 27 has a hexagonal cross section, the outer circle diameter corresponds approximately to the inner diameter of the sleeve 12 (see Fig. 2). The open section 28 of the guide insert 25 has a circular cross section, its diameter corresponds to the inside diameter of the coil former 17 . The shoulder 24 is formed by the transition of the two sections 27 , 28 . The wall of section 27 is penetrated by a bore 29 which connects the inner space of the guide insert 25 with the annular groove 21 .
On the bottom 13 of the magnetic shell opposite end of the coil body 17 , the flange-like edge 31 of a pole element 32 is supported, which projects into the cavity 19 of the coil body and with a shoulder 33 of smaller diameter in the section 28 of the guide insert 25 . The pole element 32 is penetrated by a central bore 34 , in which a plunger 35 is guided in a tightly sliding manner. This plunger protrudes through the pole element into section 28 of the guide insert and interacts with a cylindrical armature 37 arranged there.
This magnet armature 37 has a shoulder 38 of smaller diameter, which projects into the section 27 of the guide insert, and a shoulder 39 of larger diameter located within the section 28 of the guide insert. The transition 40 between the paragraphs 38 , 39 is conical.
In the end of the pole element 32 provided with the flange-like edge 31 , an annular groove 43 extending from the outer circumference is introduced, so that a cylindrical shoulder 44 is formed. From this sentence protrudes into a corresponding recess 45 in an end face of a plastic connecting piece 46 , which has a flange-like edge 47 , the outer diameter of which corresponds to that of the edge 31 of the pole element. From the recess 45 is a two-tiered, axially extending bore 48 , the bore sections starting from the recess with 48 A- 48 C be marked, and which extends to about the middle of the connecting part 46 . From the opposite end face of the connecting part there is also a double graduated, axially extending bore 49 , the bore sections of which are designated 49 A- 49 C starting from the end face. The transition 49 D between the bore sections 49 B and 49 C is in the form of a truncated cone. The drilling portion 49 C opens into the bore portion 48 C. The transition of the two bore portions 49 C, 48 C forms a valve seat 50 which cooperates with a valve ball 53 .
In the bore portions 48 A and 48 B is also a plastic insert 54 is fitted, the diameter of which corresponds to that of the bore portion 48 B. This valve insert 54 has an axial bore 55 , starting from the end face facing the pole element 32 , from the bottom of which an axial bore 56 extends. This opens into a bore 57 extending from the opposite end face. The transition between the bores 56 , 57 forms a valve seat 58 , which lies opposite the valve seat 50 and also interacts with the valve ball 53 . The interacting with the magnet armature 37 plunger 35 protrudes through the Axialboh tion 55 in the bore 56th
On the outer periphery of the valve insert 54 , two circumferential grooves 60 , 61 are formed, of which the groove 60 in the region of the Bohrungsab section 48 B is arranged. In this groove, a sealing ring 62 is placed. The second groove 61 is located in the area of the Bohrungsab section 48 A. From the bottom of this groove 61 are radial channels 63 which open into the axial bore 55 . About the connector 46 in the area of the bore portion 48 A radially penetrating channels 65 , the groove 61 is in communication with a pressure medium container, the connection of which is denoted by T.
The bore section 48 C is connected to radial pressure medium channels 66 in the connecting part 46 , which run in the region of the bore section 49 C without reaching it. These Druckmit telkanäle are in turn connected to a consumer, whose connection is labeled A.
In the bore portion 49 A of the connecting part 46 , a filter 67 is inserted, the filter housing 68 is clipped into an annular groove 69 in the bore portion 49 A. Through this filter, the bore 49 is connected to a pressure medium source, the connection to which is designated by P.
Practically the entire magnetic jacket 10 and the edge 47 of the connecting part 46 are extrusion-coated with plastic. This plastic body 70 thus formed ensures both the secure attachment of the connecting part 46 to the magnetic jacket 10 and protection of the connection to the crimp contact 22 on the coil body 17 .
The fastening tab 14 on the magnetic jacket is just for stiffening if embedded in the plastic body 70 . At the bottom 13 of the magnetic casing 10 , the plastic body 70 has a cylindrical opening 71 , the diameter of which is larger than the diameter of the sleeve 12 in the bottom 13 .
In the de-energized state of the magnet coil 16 , the valve ball 53 is pressed against the valve seat 58 by the pressure medium flowing through the pressure medium source connection P and the bore 49, as required by the pressure medium source. The pressure medium can past the open valve seat 50 via the bore section 48 C and the pressure medium channels 66 to the pressure medium connection A and thus to the consumer. At the same time, the holes 56 and 55 , the radial channels 63 , the groove 61 and the channels 65 and the Druckmittelan circuit T leading connection between the bore 57 and the container ter closed by the valve ball 53 .
When the magnet coil 16 flows through the current, the magnet armature 37 is pulled in the direction of the pole element 32 . The valve ball 53 is pressed against the valve seat 50 by the plunger 35 cooperating with the magnet armature. Thus, the bore 49 leading to the consumer or to the connection P is closed on one side. At the same time, there is a connection from port A of the consumer via the pressure medium channels 66 and the bore section 48 C to the bore 57 . This is connected to the open valve seat 58 with the bore 56 , which - as described above - with the container or its connection T is connected ver.
The solenoid valve described is relatively simple and inexpensive inexpensive to manufacture because of the use of large-volume turned parts, which require a high level of machining, largely dispensed with becomes. The plastic and deep-drawn parts used are costly cheaper to manufacture and allow greater freedom of design.
In addition, it is difficult to find one in series production dominant connection technology between magnetic jacket and connection part, such as B. flanging, riveting, tumbling, ultrasonic welding, ver ceases. The connection is created by the spraying process of the plastic body.
Further cost advantages result, for example, from the design of the electrical contact as a crimp contact, through which the mating connector and its attachment to the connecting cable can be saved. The integration of the fastening tab on the magnetic jacket saves complex fastening parts such as clips or the like. The plastic sheathing is stiffened and can absorb high loads. The formation of the plastic body offers the additional advantage that a good heat dissipation of the coil winding in the magnetic jacket is guaranteed. A high power conversion can thus take place without the valve being excessively heated and damaged. The magnetic force can be increased further compared to solenoid valves of a similar size. Are such electromagnetic valves such. B. installed in automatic transmission of a motor vehicle below the oil level, the anchor space is usually connected to avoid pressure build-up with the oil space. As a result, however, ferromagnetic dirt particles in particular can collect in the armature guide gap. The design of the guide insert in the solenoid valve described ensures that an accumulation of ferromagnetic particles does not lead to damage or failure of the valve. The armature space, that is, the interior of the guide insert 25 , is connected via the bore 29 and the annular groove 21 and the inter mediate spaces between the section 27 with a hexagonal cross section and the sleeve 12 with the opening 71 in the plastic body (see also FIG. 2) . Contaminated oil can flow in through this opening 71 and is pumped by the reciprocating movements of the magnet armature. Due to the magnetic fields generated by the magnetic coil, ferromagnetic particles will already accumulate in these inter mediate spaces and in the annular groove 21 without getting inside the guide sleeve.
The second embodiment shown in Fig. 3 differs from the previously described essentially in that it is closed when de-energized, that is, the leading to the pressure medium source leading connection of the valve is closed. The same parts are provided with the same numbers here, functionally identical parts are provided with the same numbers and the A.
The coil body 17 A of the solenoid valve 15 A has an annular shoulder 20 A, the longitudinal extent of which is enlarged, so that it extends on the side facing away from the bottom 13 of the magnetic casing almost to the end face of the coil body. The section 27 A of the guide insert 25 A is also extended accordingly. The section 28 A of larger diameter is correspondingly shortened and has an outwardly facing, circumferential edge 75 which fits into a recess 76 in the end face of the coil body.
The pole element 32 A is designed as a disc, the diameter of which corresponds approximately to the inner diameter of the magnetic casing. It has a bore 77 , the diameter of which is somewhat larger than the inside diameter of section 28 A of the guide insert. Through this drilling tion, the shoulder 38 A of the magnet armature 37 A protrudes almost to the bottom 26 A of the guide insert. The shoulder 39 A of the magnet armature is designed as a flat disk, the diameter of which is larger than that of the bore 77 , so that the pole element 32 A is located between this and the end face of the coil 16 A.
A compression spring 78 is supported on the shoulder 39 A of the magnet armature, the opposite end of which lies on the shoulder 24 A between the two sections 27 A, 28 A of the guide insert.
The valve insert 54 A has on its side facing the pole element a cylindrical shoulder 80 , the diameter of which corresponds to that of the Polelemen tes and which abuts against this. Between the pole element and the shoulder of the valve insert, a flat, non-magnetic residual air gap disk 81 is inserted, which has a bore 82 through which the shoulder 38 A of the magnet armature is guided. This residual air gap disc prevents direct contact between the pole element and the shoulder 39 A of the magnet armature during operation. To take on the paragraph 39 A of the magnet armature is recessed in the cylindrical shoulder 80 of the valve insert 83 , in which the paragraph of the magnet armature is arranged in a contactless manner. The edge 47 A of the connecting part 46 A is supported on the paragraph of the Ventilein set so that the recess 45 A takes up a reduced area by a circumferential annular groove 84 in the area of the paragraph.
Through the shoulder 80 of the valve insert, a bore 88 leads into a pressure chamber 85 in the valve insert 54 A. The radial channels 63 A and the bore 56 A extend from this pressure chamber 85 . The plunger 35 A is guided in the bore 88 and bears on the one hand on the valve ball 53 and on the other hand on the magnet armature.
The solenoid valve 15 A is, as previously stated, de-energized closed. Due to the action of the compression spring 78 , the valve ball 53 is pressed against the valve seat 50 via the magnet armature 37 A and the plunger 35 A, so that the bore 49 leading to the connection P is closed on one side. Analogously to the exemplary embodiment described above, the pressure medium connection A leading to the consumer and the pressure medium connection T are then connected.
If a current flows through the coil 16 A, the section 39 A of the magnet armature is drawn to the pole element 32 A. The pressure of the pressure medium source present in the bore 49 moves the valve ball 53 , so that it rests on the valve seat 58 . So that the connec tion to the pressure medium port T is closed on one side. Analogously to the exemplary embodiment described above, the connections P and A are thus connected.
Due to the described design of the working air gap between the shoulder 39 A of the magnet armature and the pole element 32 A, the manufacturing tolerances can be kept very low. A high magnetic force can thus be achieved. In addition, the temperature sensitivity is reduced by this arrangement of the working air gap, since influences due to thermal expansion of plastic components such as the coil former are very low.
The tapering of the section 38 A of the magnet armature 37 A shown here can also improve the oil circulation in the annular space between the guide insert and the magnet armature. Especially with cold pressure medium, this leads to better working behavior.
1. Solenoid valve with an approximately cup-like housing part ( 10 ) for receiving a magnet armature ( 37 , 37 A) acting magnet coil ( 16 , 16 A, 17 , 17 A), which with a magnetic pole ( 32 , 32 A) and one with Pressure medium channels ( 48 , 49 , 55 , 56 , 56 A, 57 , 61 , 63 , 63 A, 65 , 66 , 85 ) and at least one valve part ( 50 , 58 ) provided connecting part ( 46 , 46 A), characterized thereby is characterized in that the magnet armature ( 37 , 37 A) consists of at least two cylindrical sections ( 38, 38 A, 39, 39 A) with different diameters, of which the section with the largest diameter faces the magnetic pole ( 32 ), and that Magnet armature ( 37, 37 A) is guided in a guide insert ( 25, 25 A) which has at least one section ( 27, 27 A) with a polygonal cross section.
2. Electromagnetic valve according to claim 1, characterized in that the guide insert ( 25 , 25 A) is approximately cup-shaped and is closed on one side by a bottom ( 26 , 26 A).
3. Solenoid valve according to claim 1 or 2, characterized in that the section ( 27 , 27 A) has a hexagonal cross section.
4. Solenoid valve according to one of claims 1 to 3, characterized in that the guide insert ( 25 , 25 A) has a section ( 28 , 28 A) with a round cross section.
5. Solenoid valve according to one of claims 1 to 4, characterized in that the shoulder ( 39 ) of the magnet armature with a larger diameter is arranged within the section ( 28 ) with a round cross section of the guide insert ( 25 ).
6. Solenoid valve according to one of claims 1 to 4, characterized in that the magnetic pole ( 32 A) is ausgebil det as a flat disc, and that the paragraph ( 38 A) smaller diameter of the Ma gnetankers ( 37 A) through a bore ( 77 ) protrudes into the magnetic insert in the guide insert ( 25 A).
7. Solenoid valve according to one of claims 1 to 6, characterized in that the valve seat ( 50 ) cooperates with a spherical valve member ( 53 ) and that between the valve member ( 53 ) and armature ( 37 , 37 A) a plunger ( 35 , 35 A) ) is arranged.
8. Solenoid valve according to one of claims 1 to 7, characterized characterized in that this is a double seat valve.
9. Solenoid valve according to one of claims 1 to 8, characterized in that in the connecting part ( 46 , 46 A) a valve insert ( 54 , 54 A) with a second valve seat ( 58 ) is used.
10. Solenoid valve according to one of claims 1 to 9, characterized in that the magnetic casing ( 10 ) together with electrical connection parts ( 22 ) and parts of the connecting part ( 46 , 46 A) is overmolded into a housing ( 70 ) made of plastic.
11. Solenoid valve according to one of claims 1 to 10, characterized in that the magnetic casing ( 10 ) has a cylindrical sleeve ( 12 ) into which the armature ( 37 , 37 A) guiding insert ( 25 , 25 A) protrudes.
12. Solenoid valve according to one of claims 10 or 11, characterized in that the housing ( 70 ) made of plastic has an opening ( 71 ) which has gaps between the sleeve ( 12 ) of the magnet casing and the guide insert guiding the magnet armature ( 25 , 25th A) and a bore ( 29 ) in this guide insert is connected to the interior thereof.
13. Solenoid valve according to one of claims 1 to 12, characterized in that the electrical connection parts as a crimp contact tion ( 22 ) are formed.
14. Electromagnetic valve according to one of claims 1 to 13, characterized in that a fastening tab ( 14 ) is formed on the magnetic casing ( 10 ).
DE19914111987 1991-04-12 1991-04-12 Solenoid valve Expired - Fee Related DE4111987C2 (en)
DE19914111987 DE4111987C2 (en) 1991-04-12 1991-04-12 Solenoid valve
DE4111987A1 DE4111987A1 (en) 1992-10-15
DE4111987C2 true DE4111987C2 (en) 1995-01-12
ID=6429464
DE19914111987 Expired - Fee Related DE4111987C2 (en) 1991-04-12 1991-04-12 Solenoid valve
DE (1) DE4111987C2 (en)
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