JP2000133517A - Aktor for controlling electromagnetic valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease an ohm loss of an excitation coil by a method, wherein a coil window in a yoke of an opening magnet, the yoke of a closing magnet and an exciting coil disposed within the coil window are formed as a hollow cylindrical shape. SOLUTION: An electromagnetic valve control aktor is structured, so that when a space up to the yoke of an opening magnet OM is small, a force on an armature plate AP is small, and when a space up to the opening magnet OM is large, the force is large, so that the armature plate AP and the yoke of the opening magnet OM affects a magnetic stroke characteristic curve. In the armature plate AP, a thickness surrounding the hole of a press rod S is increased symmetrically in a radial direction. Furthermore, the yoke of the opening magnet OM is surrounded sideward by the yoke of the opening magnet OM at a position, where the armature plate AP is attracted by the opening magnet OM (when a gas exchange valve is opened). It is possible to minimize the ohmic loss by a coil window SF of a hollow cylindrical configuration and an exciting coil of a hollow cylindrical configuration, having a bottom face of a circular or an oval shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention provides an open magnet and a closed magnet, which magnets have an approximately rectangular cross section, and which magnets each have an approximately rectangular shape. The present invention relates to an actor (Aktor) for controlling a solenoid valve, which is composed of a yoke, one coil window is formed in each of the yokes, and an excitation coil is arranged in the coil window.

[0002]

2. Description of the Related Art Actors for controlling a solenoid valve generally consist of an opening magnet and a closing magnet, which are separated from each other by at least one spacer piece made of a non-ferromagnetic material. This spacer piece can be formed, for example, from a housing part. Between the open and closed magnets there is an armature plate made of ferromagnetic material, which is moved in each direction by the current flow of the open coil excitation coil or the closed magnet excitation coil. The magnetic stroke characteristic curve of the actor controlling the solenoid valve can be advantageously influenced by the structural configuration of the armature plate and the yoke of the electromagnet. The teachings therefor can be found, for example, in the technical book "Electromagnet."
e ", Kallenbach / Eick / Quend
t, B. G. FIG. Teubner Stuttgart 1
994.

[0003] The yoke of the opening magnet has a passage for a push rod, which transmits the force acting on the armature plate to at least one gas exchange valve.

[0004] The actor can be configured, for example, such that the actuator spring receiver is arranged on the push rod on the side facing the gas exchange valve, whereby the actor spring receiver and the outside of the open magnet are connected. An actor spring is arranged between them. In this arrangement, the push rod can be made very short and extends only from the gas exchange valve to the armature plate, the push rod being simply supported by the yoke of the opening magnet.

[0005] Alternatively, the actor may be configured such that the actor spring is located outside the closing magnet on the side of the actor opposite the gas exchange valve. For this purpose, on the extension of the push rod, a valve rod with an actor spring receiver is arranged, which valve rod is supported by a passage in the yoke of the closing magnet. The yoke of the closing magnet is
A notch surrounding the passage of the valve stem and forming a wall,
An internal thread is machined in this notch. A screw cap is screwed into the female thread of the wall, and the screw cap forms a hollow space with the wall, in which the actor spring mounted on the actor spring receiver is arranged. By turning the screw cap, the initial stress of the actor spring is variable, so that the dead position of the armature plate can be adjusted.

The actor together with the gas exchange valve forms a functional unit, the gas exchange valve corresponding to a conventional cylinder head having a camshaft, which is controlled by a valve spring and a valve spring receiver. It is pulled into the seat.

When the functional unit consisting of the actor and the gas exchange valve is mounted on the internal combustion engine, the valve shaft of the gas exchange valve and the push rod of the actor are pressed against each other. In the inoperative position of the functional unit, the armature plate is centrally located between the opening and closing magnets. The valve head of the gas exchange valve is then in a central position between the valve seat of the cylinder head in which the valve is closed and the position in which the valve is fully open.

[0008] In the structure of an internal combustion engine controlled by a solenoid valve, there is a problem that the available structural space is extremely limited. However, the actor must be configured large enough to provide the necessary power for operation of the gas exchange valve.

German Patent Application Publication No. 1961
No. 1547 proposes, for example, the construction of an actor having a rectangular cross section, in which case the structural space available in the cylinder head of the internal combustion engine is well utilized and the electromagnet of the actor is an armature A sufficiently large force can be exerted on the plate.

A disadvantage of this device is that the coil window, which is machined in the yoke of the open and closed magnets in order to generate a maximum magnetic moment, also has an approximately rectangular cross section. Thereby, the average winding length of the excitation coil inserted in the coil window is increased, so that it has a higher ohmic resistance.

[0011]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an actor for controlling a solenoid valve having an approximately rectangular cross section, having a coil window for an exciting coil having a smaller ohmic resistance. is there.

[0012]

According to the present invention, this object is achieved by the features of claim 1.
The coil windows of the open and closed magnet yokes, and the excitation coils arranged therein, are in the form of hollow cylinders in order to further reduce ohmic losses by a small average winding length.

The approximately rectangular yoke of the opening and closing magnets has an end face, which corresponds to the outside diameter of the coil window plus a marginal thickness edge. The length of the longitudinal side of the yoke corresponds to the part determined by the structural space in the cylinder head available for the end face plus the actor.

At this time, the bottom surface of the hollow cylindrical coil window and the hollow cylindrical excitation coil can be formed in a circular or elliptical shape.

In a variant of the invention, the following is taken into account. That is, the armature plate and the yoke of the opening magnet are
In order to influence the magnetic stroke characteristic curve, it is structurally configured so that the force of the open magnet to the armature plate is small when the interval is small and large when the interval is large.

The material of the armature plate is designed to have a greater thickness around the hole of the push rod in a radially symmetric manner in order to influence the magnetic stroke characteristic curve as much as possible, The yoke of the magnet is formed complementary to the armature plate. In addition, the opening magnet yoke may be partially or completely surrounded by the ferromagnetic material of the opening magnet yoke at the position where the armature plate is attracted by the opening magnet (when the gas exchange valve is open). Can be configured.

In another variant of the invention, the following is considered. That is, the yoke of the opening magnet and the yoke of the closing magnet are thinned (perpendicular to the longitudinal axis and parallel to the valve axis) in the region of the excitation coil, thereby reducing eddy current losses. Is done.

With the hollow cylindrical coil window and the resulting hollow cylindrical excitation coil, ohmic losses in the excitation coil are minimized. In this case, the machining of the coil window in the yoke of the opening magnet and the yoke of the closing magnet, and the winding and insertion of the exciting coil in the coil window are particularly advantageous.

[0019]

DETAILED DESCRIPTION OF THE INVENTION Next, there are open and closed magnets, which have approximately rectangular cross sections.
An actor for controlling a solenoid valve according to the invention is shown and described by way of example with reference to two figures.

FIG. 1 shows an actor for controlling a solenoid valve. The yoke of the opening magnet OM and the yoke of the closing magnet SM are separated from each other by two spacer pieces DS, which are made of a non-ferromagnetic material. The armature plate AP vibrates between the spacer pieces DS. A push rod S is attached to the armature plate AP, and the push rod exerts a force acting on the armature plate AP.
The gas is transmitted to the gas exchange valve GV via a passage in the yoke of the open magnet OM. A valve stem SS rests on the armature plate AP at the extension of the push rod S, which acts on the armature plate AP through a passage in the yoke of the closing magnet SM by an actuator spring. Transmit to AF. For this purpose, an actor spring receiver AFT is formed on the valve stem SS, and an actor spring SF is mounted on the actor spring receiver. Push towards AP. Actor spring AF
Are located in a notch forming the wall of the yoke of the opening magnet OM, and this notch is formed around the passage of the valve stem SS symmetrically in the radial direction. The wall has a screw inside,
The screw cap SD can be screwed into this screw. With the screw cap SD, the initial stress of the actor spring AF is variable, whereby the inoperative position of the armature plate AP is adjusted.

The yoke of the open magnet OM and the closed magnet SM
A coil window is machined in the yoke, and one excitation coil is inserted into each of the coil windows. The coil window is preferably processed so that the magnetic pole surfaces (surfaces facing the armature plate AP) of the yokes of the opening magnet OM and the closing magnet SM are the same size inside and outside the coil window.

The resistance of the exciting coil is synthesized from its ohmic, capacitive and inductive components.

Ohmic resistance (open magnet OM and closed magnet S
In order to reduce the power loss caused by the magnetic pole faces of the yoke of M), the excitation coil is, for example, circular and hollow cylindrical. The small ohmic resistance of the circular hollow cylindrical excitation coil results from a smaller average winding length of the coil wire.

Due to the structural space available between the push bar passage and the edge of the rectangular yoke, the same hollow cylindrical excitation coil may be deformed into an elliptical shape and correspondingly processed into an elliptical shape. Can be inserted into the coil window.

FIG. 2 shows a circular hollow cylindrical coil window SF.
An actor for performing solenoid valve control having the following is shown. This actor corresponds to the actor of FIG. 1, but here, the armature plate AP and the yoke of the open magnet OM affect the magnetic stroke characteristic curve. In addition, when the distance between the opening magnet OM and the yoke is small, the force on the armature plate AP is small, and the force is increased when the distance between the opening magnet OM and the opening magnet OM is large.

In this case, the material of the armature plate AP is configured to have a greater thickness around the hole of the push rod S symmetrically in the radial direction, in which case the yoke of the open magnet OM is Is formed. In addition, the yoke of the open magnet OM opens at the position where the armature plate AP is attracted by the open magnet OM (when the gas exchange valve is opened).
The M yoke is configured to be laterally surrounded by the ferromagnetic material. The spacer pieces DS made of a non-ferromagnetic material are correspondingly small.

[0027] In this case, in addition to the circular hollow cylindrical excitation coil with the corresponding circular hollow cylindrical coil window SF, manufacturing technology advantages are obtained.

The armature plate AP, which has to be very firmly connected to the push rod S, is turned after it has been connected to the push rod S in order to reduce manufacturing tolerances. This manufacturing step involves a circular armature plate A symmetrical with respect to the push rod S.
Due to the thickness of P, this can be done very easily.

With the hollow cylindrical coil window SF and the resulting hollow cylindrical excitation coil having a circular or elliptical bottom surface, the ohmic losses of the excitation coil are effectively minimized. In the case of a circular hollow cylindrical excitation coil having a corresponding coil window, a number of manufacturing technical advantages are obtained.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of an actor that performs electromagnetic valve control.

FIG. 2 is a schematic cross-sectional view of an actor that performs electromagnetic valve control.

[Explanation of symbols]

 A actor AP armature plate OM open magnet S push rod SF coil window SM closing magnet

Continued on the front page (72) Inventor Mattheus Grumman Neunkirchen Roy Zuembergersciutlase 2, Federal Republic of Germany (72) Inventor Thomas Retzl Freiburg Profu Schuttark-Schutlase 21, Federal Republic of Germany (72) Inventor Rudolf Weilchiek Altdorf Heidov Eke 11 Germany (72) Inventor Reinhard Altmann Mainz auf der Burg 22 Germany

Claims (5)

[Claims] An open magnet (OM) and a closed magnet (SM)
Are provided, the magnets having an approximately rectangular cross-section, and each of these magnets consists of an approximately rectangular yoke, in which each one coil window (SF) is provided. In an actor (A) for controlling an electromagnetic valve in which an exciting coil is arranged in the coil window, a coil window (SF) in a yoke of an open magnet (OM) and a yoke of a close magnet (SM) is provided. ), And an actuating solenoid valve controlling actuator (A), characterized in that the exciting coil arranged in the coil window (FS) is in the form of a hollow cylinder to reduce ohmic losses. 2. A coil window (S) formed in a hollow cylindrical shape.
F) and the bottom surface of the excitation coil formed in a hollow cylindrical shape,
The actor of claim 1, wherein the actor is circular. 3. A coil window (S) formed in a hollow cylindrical shape.
F) and the bottom surface of the excitation coil formed in a hollow cylindrical shape,
The actor of claim 1, wherein the actor is elliptical. 4. An armature plate (AP) and an open magnet (OM)
To affect the magnetic stroke characteristic curve,
The armature plate (AP) is made thick around the push rod (S), and the yoke of the open magnet (OM) is attached to the armature plate (AP).
Are formed structurally so as to be complementary to the armature plate (AP) and the open magnet (OM).
Armature plate (AP)
To the armature plate (AP) and the open magnet (O
4. The actor according to claim 1, wherein the distance between the yoke of M) and the yoke is large. 5. The yoke of the opening magnet (OM) and the yoke of the closing magnet (SM) are thinned in the region of the excitation coil perpendicular to the longitudinal axis of the yoke and parallel to the valve axis. Actor according to one of claims 1 to 4, characterized in that: