DE2643862A1 - ELECTROMAGNETIC VALVE - Google Patents

Description

* - ££ 43862

State of the art

The invention is based on an electromagnetic valve according to the preamble of the main claim.

Such an electromagnetic valve is known (DT-OS 2 H03 77O). In this known device, the valve spring of the outlet valve is over the closing body of the inlet valve

supported. In its currentless starting position, the armature is under a spring force of the armature main spring, which must be so strong that the outlet seat is securely closed. An adjustment of the armature from this starting position therefore requires a large magnetic force, which is not available in all cases. In addition, the springs are switched against each other »which means that tolerances also have an unfavorable effect. In addition, designs with two or three springs are known; However, these types of construction are not suitable for _{leaf spring mounting of the armature 3} because the leaf springs are stressed too much ₃ if, in addition to centering the armature, they are also supposed to take over its return «,

Advantages of the invention

The valve device according to the invention with the characterizing features of the main claim has the advantage over this that an elastic suspension of the anchor can be used to reset the anchor and that act on the anchor Spring forces and their tolerances can be very small.

Furthermore, it is advantageous that the elastic suspension is lightly loaded _s because it is not necessary _a bias them ο

Drawing,

Sin Ausfülirungsbeispiel the invention is in the drawing shown and explained in more detail in the following description. Show it; Fig- i the valve device in section,

80I313 / OS44 ORIQiNAL INSPECTZD

Pig. 2 shows a diagram of the forces on the armature and the armature travel, and FIG. 3 shows a plan view of a leaf spring.

Description of the invention

is

A solenoid valve l / between a port II as Pressure receiver as well as a connection I as a pressure source and a connection III as a relief point. the The pressure source is a pump 3 and the pressure receiver is a brake cylinder 2. A coil 5 is seated on a coil carrier 6 and this in turn is pushed onto a jacket pipe 7 which is connected to a non-magnetic ring 8, e.g. by welding is. A magnetic circuit is made possible via a housing part (not shown).

The jacket pipe 7 with the ring 8 and a yoke 9 and a in this attached inlet valve seat 12 are firmly connected to one another. In this facility is - on a jacket pipe shoulder l4 put on - housed an anchor package, which consists essentially of a ring 11 and an anchor 13. The ring 11 and the armature 13 are over two leaf springs 16 and 17 connected to each other, for example, by welding; a plan view of a leaf spring 16 or 17 is in FIG Fig. 3 shown. The leaf springs 16 una iy are äus ^ spring material manufactured, they are therefore elastic. Between the upper leaf spring 17 and a seat 10 · for the outlet valve having end piece 10 is still a spacer ring Jacketed pipe 7 held.

In the armature 13, a multiple stepped, continuous recess 19 is provided, into which closing body 20/22 of the inlet valve 12, 20/22 and ^ Ses outlet valve 10 «, 21/23 are used.

The two closing bodies 20/22 and 21/23 'are provided with balls 20, 21 which are each embedded in a ball holder 22 and 23 and are attached. The ball retainer 22 of the inlet valve closing body 20/22 usually rests on a shoulder 24

809 8 13/0544

ORIGINAL INSPECTED

the recess 19. As a result, the closing body 20/22 is lifted from the valve seat 12, which is the inlet valve 12, 20/22 opened. A spring 25 acting on the inlet valve closing body 20/22 is supported on a ring 26 which is shown in FIG the anchor 13 with the help of another ring as a shoulder is attached. The shoulder 27 has a recess, as a result of which an axial gap 28 is formed between it and the ring 26 is, which receives the ball holder 23 of the outlet valve closing body 21/23 with axial play. The ball holder 23 is with axial openings 23 'provided for the passage of pressure medium.

A valve spring 35 of the outlet valve 10, 21/23 is arranged inside the spring 25 and at one end it rests against the ball 23. Your "other ¹ end is" on a ring 29 is supported, which is supported by three rods 30 on a plate 31 which is on a shoulder 32 of the inlet valve seat 12 supporting pipe extension 11 '. The three rods 30 penetrate the carrier 22 of the inlet valve closing body 20, which for this purpose is provided with three openings 33 corresponding to the diameter. The ring 29, the three rods 30 and the plate 3I form an intermediate piece 29, 30, 31.

A spring 34 is arranged under the armature 13, which tends to push the armature 13 upwards so that the outlet valve 10, 21/23 is closed and the inlet valve 12, 20/22 is open when the magnet is de-energized. This spring 34 can, however, also be omitted, and its restoring force can be generated solely by the elasticity of the two diaphragms 16 and 16.

Mode of action

In the de-energized starting position of the device, the pressure receiver 2 with the pressure source 3 is through the hollow armature 13 and through the openings 23 ′ in the ball holder 23

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connected through. If the coil 5VünterΊδΐτοπι is set,

809813/05 4% - 5 -

-ORiQiNAL INSPECTED

so the armature 13 is pulled down ₃ whereby the leaf springs 16 and 17 are deformed elastically alone or - if present - together with the spring 34. In addition, the spring 35 ₃ stretches so that the closing body 21/23 of the outlet valve ίο ', 21/23 remains on its seat 10' until the closing body 20 of the inlet valve 42,20 / 22 reaches its seat 12, and then that Inlet valve 4Z ₁ ^ / ^ is closed.

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With a further stroke of the armature 13 / Hiird from the ring 27 of the outlet valve closing body 21/23 is lifted from its seat 10 'and thus the outlet valve 1 ″, 21/23 is opened. Now the Relax pressure medium in the pressure receiver 2 towards the relief point 4.

When the armature 13 moves, it is not subject to any friction, since it is frictionless due to the leaf springs 16 and 17

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is stored. Furthermore, by the support ^ of the outlet valve til closing body 21/23 outside the armature 13 on the fixed housing Shoulder 32 · achieved that the elastic leaf springs 16 and 17 take over the return of the armature 13 can. The leaf springs 16 and 17 are only exposed to a low level of stress because they are not pretensioned

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are. "(if" the compression spring 3 ^ to aid in resetting is used, because the spring 34 can be without bias to be built in. Furthermore, it is advantageous that the spring forces acting on the armature 13 thereby are very small, because springs are connected against each other is avoided. It is therefore easy to adhere to tolerances.

The advantage of the small spring forces also applies to the case _s when there is no resetting by membrane forces, but by the forces of the compression spring 34.

In the path-force diagram according to FIG. 2 it can be seen that the springs for the armature return over the entire armature path are effective and that the springs for the inlet valve seat 12 and outlet valve seat 10 'between the middle position and

10981370544 - 6 -

ORlGfMAL INSPECTED

the end position of the armature 13 contribute to the armature reset.

The advantage is that all forces are added together. It will no forces in any area are subtracted or switched against each other. The forces can therefore be kept small, that means to be individually adapted.

7 -

809813/0544

) RiGINAL !! MSFECTED

L e r s e i f e

Claims (4)

-r- Expectations 11.1 Solenoid valve with three hydraulic connections., In which the armature is held in an initial position due to the effect of a restoring force, in which a first and a second connection are connected to one another and a third connection is closed by a first closing body, in which the armature is through a control force can be moved against the restoring force into an end position in which the first connection is closed by means of a second closing body and the second connection is connected to the third connection by entrainment of the first closing body, in which the two closing bodies are biased relative to the armature against the Forces caused by springs, acting in the direction of the valve seats, can be lifted from the carrier provided on the armature, one of which comes into engagement with a closing body shortly before reaching an anchor end position and lifts the closing body from the valve seat, in which there is still an intermediate position for the anchor it is provided in which both closing bodies sit on the valve seats and from which an increased restoring force acts on the armature when it continues to move into the end position, which is not overcome by the control force supplied to control the intermediate position, characterized in that on the first shooting body (21/23) a spring (35) acts which acts on a point fixed to the housing (intermediate piece 29,30 _s 31) of the solenoid valve. 109813 / ÖSU ORIGINAL INSPECTED 2. Electromagnetic valve according to claim 1, characterized in that the acting on the first closing body (21/23) Spring (35) is a compression spring and the point of the solenoid valve that is fixed to the housing is an intermediate piece (29,30,31). 3- solenoid valve according to claim 2, characterized in that the intermediate piece (29,30,31) engages through openings (33) in the second closing body (2,0 / 22) and onto the valve seat (12) of the second closing body (20/22 ) can be attached. 4. Solenoid valve according to claim 3, characterized in that that the valve seat has a shoulder (32) for the contact of the intermediate piece (29,30,31) and that the intermediate piece (29,30,31) the second closing body (20/22) is guided with radial play S09813 / 0SU ORIGINAL INSPECTED