DE2363406A1 - Direction flow control valve for hydraulic application - spring biased solenoid valve provides 3-way control operation - Google Patents

Abstract

An hydraulic directional flow control utilises a solenoid, comprising a coil and a moving armature to provide connections between three ports. In the stand-by condition the valve poppet is held firmly against output by a coil spring. In this condition a second poppet is clear of the seating. Since the solenoid is not energised the valve is held in the extreme right position by a coil bias spring. When the solenoid is energised a leftwards motion of the moving valve body takes place and second poppet moves against the seating. At the same time first poppet is released permitting a flow path to be established between the second poppet to port aperture.

Description

TELDIX GmbH
6900 Heidelberg 1
Grenzhöfer Weg 36

Heidelberg, December 12th Pt-Ka / Pr E-313

Valve with three or four hydraulic connections

The invention relates to a valve with three or four hydraulic connections according to patent. · ............... (patent application P 22 5? 213.0), in which the armature is held due to the action of a first spring force in .einer starting position in which a first and a second connection are connected to one another and a third connection by a first closure body is closed, in which the anchor by a Control force against the first spring force in a .. The second position is movable, in which the second connection is closed by means of a second closure body and the third terminal is connected to another terminal in which the two closure bodies relative to the anchor opposite that of one between them clamped second spring caused forces acting in the direction of the valve seats up to the armature provided drivers can be moved, of which

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one each comes into engagement with a closure part shortly before reaching an anchor end position and aas Closure part lifts off the valve seat, in which an intermediate position is still provided for the armature is in which both closure bodies on the valve seats sit up and from which on the armature with a further movement in the second position an increased Spring force acts, which is not overcome by the control force supplied to control the intermediate position will. -

The invention of the main patent is based on the object to provide a valve that allows three set different states, the valve should be simple and work precisely.

The description of the subject matter of the main patent is intended to be based on the exemplary embodiment in FIG. done in the drawing, the reference numerals of the main patent being adopted. - _:

Fig. 1 shows a section through this embodiment.

The valve housing is designated here with 1 ', the excitation coil with 2 ¹ and the armature with 3 °. The three hydraulic connections are labeled ^{6 'to 8 1.} The locking pieces are labeled 4- 'and 5V. The spring pressure on these locking pieces is caused by the common spring 10 '. The spring 9 * holds the armature in the initial position shown.

The locking pieces h * and 5 'can "move" as shown at points 21 and 22 in the axial direction of the armature $' and relative to it.

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ses 8 ¹ iind the stop 23 and, with regard to the locking piece 5 ^1, caused by the stop 15 ¹ and the spring 10 *.,

If the valve is now energized with the small power, the armature 3 * moves to the left, whereby the closure piece 5 'comes to rest on the valve seat of the connection 6. The movement stops when the stop 16 ^{f, which is} movable relative to the armature 3, comes to rest on the locking piece 5 ', since the magnetic force is not sufficient to overcome the force of the spring 17' which holds the stop 16 'in the position shown .

If the excitation is increased further, the armature is moved further to the left, whereby the stop moves 16 * against the spring force 17 'relative to the armature 3' moved until the movable stop 16 'comes to rest on the stop 24-. With this movement from the Between the intermediate position in the end position, the stop 14 ″ has taken along the locking piece 4 ′ and the connection 8 * open. -

In the embodiment shown here, a first spring 9 'is provided, which is the starting position specifies. A second spring 10 'acts here on both locking pieces and holds them in the frame ' given by the stops and valve seats ■ Possibilities at maximum distance.

The intermediate position is here by a third spring 17 'in cooperation with the movable stop 16 * fixed. This when reaching the intermediate position The spring that becomes effective can, for example, also act on the armature once the intermediate position has been reached 3 'be vrirkende disc spring, the same as the

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Spring 9 'between the housing 1' and the armature 3 ^{1 is} effective.

The object underlying the invention is in further simplifying the valve according to the invention.

This object is achieved by the features specified in claim 1. *

In the valve according to the invention, in contrast to the exemplary embodiment in FIG. 1, there are only two springs provided, the additional spring force effective from the intermediate position is changed here by generated by the force of the spring clamped between the two closure parts on the armature. Of the movable stop 16 * is not applicable here. To define the intermediate position, the omission of the Take advantage of the action of the second spring on the armature. However, it is preferred that when entering the one entrainment occurring with the first locking piece Reversal of direction of the acting force of the second spring exploited.

This possible solution is to be explained in more detail on the basis of the exemplary embodiment in FIG. 2.

In this drawing only half of the armature and part of the housing are shown. The the Parts corresponding to FIG. 1 are denoted by the same basic reference numerals, but with double strokes. It can be seen from Fig. 2 in comparison to Fig. 1 that the spring 17 * and the movable stop 16 'are omitted are or that the parts 16 * and 23 of Fig. 1 in Fig. are combined into a common part fixed on the anchor 3 '.

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In the illustrated starting position of the armature, in which the closure part 4 ″ is ^{seated on the valve seat of the opening 8 11} , the spring 10 ″ is supported on this valve seat via the closure piece 4 ′ and produces its effect on the armature via the closure piece 5 * · A force directed to the left, that is, the force of the spring 9 ' ^1. The difference between the forces therefore acts when moving from the starting position

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the springs 9 ″ and 10 ″ counteract this movement. Shortly before reaching the intermediate position, the closure body 5 rests on the valve seat of the opening 9. At this point, the spring 10 '' no longer has any influence on the armature. Basically, this position can already be used as an intermediate position, for which the control force must be dimensioned accordingly ^{the force of the spring 10 * 'on the armature 3 11} , which changes again with further movement to the left by the engagement of the stop 14' with the locking piece 4 '', is used; From the moment at which the stop 14 'wants to lift the closing piece 4' from the valve seat, the armature movement is counteracted by the sum of the (now rectified) forces of the springs 9 '* and 10''. So the spring force changes by a total of 2 F ^ ₀ , _f . The position in which this change in the spring force occurs is defined as the intermediate position and the control force for controlling the intermediate position is dimensioned accordingly. The forces of the springs 9 '* and 10' * must also be dimensioned in relation to one another in such a way that the change in the force opposing the armature movement can be used to define the intermediate position and a control force can be established for this purpose. It is also essential here to choose the solar tolerances in such a way that

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that in any case the locking piece 5 '' on the The valve seat is seated before the closure piece 4- · · is lifted, so that in the course of the movement a period or at least a point in time occurs, in which both closure bodies sit.

- patent claims -

/ rt Π * 5 1 ■ -

Claims (2)

Claims Valve with three or four hydraulic connections according to patent .... (patent application P 22 57 213.0), in which the armature is held in an initial position due to the action of a first spring force, in which a first and a second connection are connected to one another and a The third connection is closed by a first closure body, in which the armature can be moved by a control force against the first spring force into a second position in which the second connection is connected to another connection by means of a second closure body, in which the two closure bodies are relatively to the armature against the forces caused by a second spring clamped between them, acting in the direction of the valve seats, up to the entrainment provided on the armature, each of which comes into engagement with a closure part shortly before reaching an anchor end position and lifts the closure part from the valve seat , where there is still an intermediate position g is provided for the armature in which both closure bodies sit on the valve seats and from which an increased spring force acts on the armature b. when moving further into the second position, which is not overcome by the control force supplied to control the intermediate position, characterized in this that the increased spring force is formed only by the occurring in the intermediate position change of the force of the second spring on the "armature and that the control force for the intermediate position is dimensioned accordingly. 2. Valve according to claim 1, characterized in that which are taken along when one of them intervenes / 8 509828/0021 the first closure body occurring increase in the sum of the spring forces acting on the armature is exploited is. Heidelberg, December 12, 1973 Pt-Ka / Pr E-313 509828/0021 Blank page