JPH0371605A - Solenoid valve - Google Patents

Abstract

PURPOSE: To obtain good magnetic force characteristic lines by forming the opposite poles of an electromagnet conically such that the conical faces of the pole have an identical conical angle. CONSTITUTION: Poles 17 of a mover 14 having an identical conical angle are formed while space apart through a work air gap 16 from a conical counter pole 15 formed on the end face at the free end of a pin 13 of a casing 10. Consequently, the plane at the work air gap 16 is widened as compared with a solenoid valve having a flat counter pole. When a coil 12 is excited, the mover 14 is pulled toward the counter pole 15 while resisting against the force of a compressive spring 19. Pressure generated from a pump 43 causes a valve 38 to abut against a valve seat 37 and a pressure medium flows through a chamber 39 into a part 44 to be coupled with a consumption unit. Consequently, good magnetic force characteristic lines can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a solenoid valve equipped with a mover having a circular cross section, the mover having a push rod for actuating a valve body, PRIOR ART OF THE PRIOR ART OF THE PRIOR ART OF THE TYPE OF LOCATED PARTIALLY IN THE THROUGH BOLL OF THE ENROLLING COIL In known solenoid valves of the type mentioned above, the mutually facing magnetic poles of the electromagnet are constructed flat, with a small gap between the flat magnetic poles. There is only room for humorous humor.

Structure of the Invention In the electromagnetic valve according to the present invention, the magnetic pole of the electromagnet is configured in a conical shape, and the conical surfaces of the magnetic pole have the same cone angle.

Advantages of the Invention The configuration according to the invention provides that the working gap is equal to the known t[
It can be made larger than a conventional solenoid valve, and provides a better magnetic force characteristic line than known solenoid valves.

Advantageous features of the present invention are described in the following claims.

The spherical housing 10 of the exemplary solenoid valve is preferably a deep-drawn part. An interior chamber 11 of the casing houses a coil 12 which surrounds a central pin 13 and an armature 14 extending from the bottom. The pin 13 extends approximately to the center of the casing. A conical counter electrode 15 is formed on the end face of the free end of the bottle. The counter pole is separated by a working gap 16 from a magnetic pole 17 formed corresponding to the counter pole of the mover 14 . That is, the magnetic pole and the counter pole have the same cone angle. A compression spring 19 is arranged in the cylindrical recess 18 of the pin 13 and acts on the armature 14 . The mover has a vertical hole 20 in the center, and a push rod 21 is installed in this vertical hole. The mover itself has a substantially cylindrical shape except for the conical magnetic pole 17.
The lower part 14A is guided with play (radial gap) in the cylindrical recess 23 of the pole plate 24. At least one longitudinal groove 25 is formed in the outer periphery of the movable element 14, and the movable element chamber 2 is formed through this longitudinal groove.
The fluid in 6 is quickly displaced from the front to the rear.

As is clear from FIG. 3, a ring groove 27 is formed on the outer periphery of the push rod 21 near the lower end face of the mover 14, and in this ring groove there is material caulked from the end face of the mover. Parts are pressed in. This ensures that the mover is firmly connected to the push rod. For caulking, the mover is received in the tool receiving part 28 together with the push rod, and a maximum distance . Then caulking is performed.

Seven flanges 32 of a valve casing 33 are connected to the pole plate 24, and the lower edge 11A of the casing 10 engages around the flange 32 by a rotating collar. A coil guide portion 34 is formed on the opposite end surface of the casing 10. In other cases the casing is closed hermetically.

The tip of the push rod 21 guided in the hole 49 of the magnetic pole plate 24 passes through the hole 35 of the valve seat plate 36, and a valve for the spherical valve body 38 is formed on the face of the valve seat plate opposite to the mover. A seat 37 is formed. The valve body is located in the chamber 39 of the valve casing.
A second valve is located inside the valve casing and a second
A valve seat 40 is formed. This second valve seat has a blind hole 4.
1 is connected, and a pump connecting portion 42 is connected to this blind hole. A consumer connection 44 is also connected to the chamber 39 on the outside of the second valve seat. Valve plate 36 inside the valve casing
A chamber 46 is formed between the magnetic pole plate 24 and the magnetic pole plate 24, and this chamber is connected to a horizontal hole 47, which is connected to the tank 45.

When the coil 12 is not energized, the compression spring 19
is pressing the valve body against the valve seat 40 via the movable element 14 and the push rod 21. The pressure medium is transferred from the consumer connection 44 to the chamber 3
9, flows through the valve seat 37, chamber 46 and side hole 47 to the tank. Pump connection 42 is closed. As is clear from this, the solenoid valve is closed without current. When the coil is energized, the mover 14 is compressed by the compression spring 19.
is pulled toward the counter electrode 15 against the force of. The pressure generated by the pump 43 pushes the valve body 38 against the valve seat 37.
, so that the pressure medium flows through the chamber 39 to the consumer connection 44 .

By configuring the magnetic pole 17 and the counter pole 15 in a conical shape,
The surface of the working cavity is enlarged. 1 in the magnetic force/characteristic line indicates the magnetic force/characteristic line of a solenoid valve with a flat opposite pole, as shown in Figure 2.
The characteristic line is significantly flatter than 2. The distance S is plotted on the abscissa and the magnetic force F is plotted on the ordinate. Particularly high attraction is achieved when the force is large in the gap and the adhesion force upon attraction is small. The off-centering of the armature and counterpole within the casing must be small in order to minimize the magnetic lateral forces generated and to avoid high friction or tipping of the armature. These requirements are ideally met by the aforementioned solenoid valve, for example by the integral construction of the casing.

The magnetic pole plate 24 has three functions: First, the magnetic field lines are guided through the radial gap 48 between the magnetic pole plate and the outer circumference of the armature and the cylindrical recess 23 . The length 1 of the radial gap is kept large by the recess 23,
This minimizes air gap losses. Furthermore, the spacing between the pole plate and the armature is kept small due to the integral construction of the housing, so that off-centering is kept small, which has an advantageous effect on magnetic losses in the radial gap 48. Furthermore, a hole 49 in the center of the pole plate serves for guiding the push rod 21. Another important function of the pole grates is to shield the armature chamber against the ingress of ferromagnetic particles, which are present in high proportions in the drive oil, especially when used in drive transmissions. Ferromagnetic particles will accumulate in areas of highest local density, ie within the radial and working voids, and over time will affect function or cause valve failure. In particular, when switching over the armature, i.e. when releasing the pressure from the consumer connection 44 towards the tank connection (lateral hole 47), the magnetic pole plates are exposed to the pressure medium and thus to the ferromagnetic particles contained in the pressure medium. It is prevented from flowing into the mover chamber 26.

A further advantage of the solenoid valve according to the invention is that, due to the magnetic flux guidance via the pole plate 24, the valve housing is made of a different material, for example steel or aluminum. The material of the valve housing can be chosen, for example, from the same material as the control housing of the drive transmission, so that the gap does not change due to temperature fluctuations due to the same thermal expansion and therefore the leakage flow does not increase. Due to the special structure of the solenoid valve and based on the good magnetic characteristic line,
Adjustment processes, means such as compensation plates or adjustment screws are omitted.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of the tT;Ii valve according to the embodiment of the present invention, FIG. 2 is a magnetic force characteristic diagram of the t81 valve, and FIG.
It is a figure which shows the assembly process of the mover of a valve. 10...Casing, 11...Inner chamber, 12...Coil, 13...Pin, 14...Mover, 14A...
・Part 15... Counter electrode, 16... Working gap, 17...
・Magnetic pole, 18... Notch, 19... Compression spring, 2o
... vertical hole, 21 ... push rod, 23 ... recess, 24
...Magnetic pole plate, 25...Vertical groove, 26...Mover chamber, 27...Ring groove, 28...Tool receiving part, 2
9... Tip, 3o... Opposing holder 32...7
Lunge, 33... Valve casing, 34... Coil guide section, 35... Hole, 36... Valve seat plate, 37...
... Valve seat, 38... Valve body, 39... Chamber, 40...
Valve seat, 41... Blind hole, 42 River pump connection, 43...
・Pump, 44...consumer connection part 45...tank,
46... Chamber, 47... Lateral hole, 48... Radial gap, 49... Hole FIG, 3

Claims (7)

[Claims] 1. A solenoid valve equipped with a mover (14) having a circular cross section, the push rod (21) in which the mover operates a valve body (38).
and is partially located in the through hole of the coil surrounding the mover, the magnetic poles (15, 17) of the electromagnet are configured in a conical shape, and the conical shape of the magnetic pole is A solenoid valve characterized in that its surfaces have the same cone angle. 2. The mover chamber (26) is filled with liquid, and the outer periphery of the mover (14) is provided with at least one longitudinal groove (
25). The electromagnetic valve according to claim 1, wherein: 25) is formed. 3. The magnetic pole plate (24) has a cylindrical recess (3
3), and the diameter of the recess is larger than the outer diameter of the mover by a radial gap (48). 4. 4. Electromagnetic device according to claim 1, characterized in that the valve body (38) is constructed as a sphere and is adapted to cooperate with two valve seats (37, 40) located opposite each other. valve. 5. The valve is configured as a 3-port, 2-position valve and, in the energized state, the pressure medium discharged from the pump flows into the consumer connection (44) via one valve seat, causing the current flow in the coil. 5. The electromagnetic valve according to claim 1, wherein the solenoid valve is configured to flow into the tank connection (47) via the other valve seat when the valve is not in use. 6. A compression spring (19) is attached to the conical end face (17) of the mover.
6. The electromagnetic valve according to any one of claims 1 to 5, wherein: 7. From claim 1, wherein the movable element (14) has a vertical hole (20) passing through the center thereof, and a push rod (21) for actuating the valve body (38) is immovably arranged in this vertical hole. 6. The solenoid valve according to any one of items 6 to 6.