CN115234335A - Electromagnetic actuator and camshaft phase adjuster - Google Patents

Abstract

The invention provides an electromagnetic actuating device and a camshaft phase adjusting device, wherein the electromagnetic actuating device comprises a shell (H) and at least one actuating unit, the actuating unit comprises an electromagnet (10) and a pin, the pin partially extends out of the shell (H), the pin is used for reciprocating in an axial direction (A) under the driving of the electromagnet (10), the actuating unit further comprises a magnetic piece and a magnetic field detection device, the magnetic piece and the magnetic field detection device are respectively arranged in a stationary mode relative to the shell (H), the pin is kept in an axial spacing mode with the magnetic piece during the movement process far away from or close to the magnetic piece and influences a magnetic field around the magnetic piece, and the magnetic field detection device is used for detecting the change of a magnetic field signal around the magnetic piece so that the position of the pin in the axial direction (A) can be determined. The electromagnetic actuating device has simple structure and high reliability.

Description

Electromagnetic actuator and camshaft phase adjuster

Technical Field

The present invention relates to the field of actuators, and more particularly to an electromagnetic actuating device and a camshaft phase adjusting device.

Background

Chinese patent publication CN106640255A discloses a cam shaft slider control system, which drives a pin by electromagnetic force to slide in a slot, thereby pushing a slider to move along the axial direction of a cam shaft to realize different valve lifts.

Disclosure of Invention

The invention aims to provide an electromagnetic actuating device and a camshaft phase adjusting device which are convenient to control and high in reliability.

According to a first aspect of the present invention, there is provided an electromagnetic actuating device comprising a housing and at least one actuating unit comprising an electromagnet and a pin which partially protrudes from the housing and which is adapted to reciprocate in an axial direction upon actuation of the electromagnet, wherein,

the actuator unit further comprises a magnetic member for detecting the position of the pin and a magnetic field detection device, both of which are arranged stationary relative to the housing, the pin being axially spaced from the magnetic member during movement away from or towards the magnetic member and being capable of influencing the magnetic field around the magnetic member,

the magnetic field detection device is used for detecting the signal change of the magnetic field around the magnetic part so as to determine the position of the pin in the axial direction.

In at least one embodiment, the strength of the detection signal is linearly related to the distance of the pin from the magnetic member in the axial direction.

In at least one embodiment, a line connecting the north pole and the south pole of the magnetic member passes through or is parallel to the axial direction.

In at least one embodiment, the magnetic field detection device is disposed between the magnetic member and the pin in the axial direction.

In at least one embodiment, the pin is disposed axially coaxially with the magnetic member.

In at least one embodiment, the pin is made of a material comprising a soft magnetic material.

In at least one embodiment, there are two of the actuator units, two of the actuator units being disposed side by side, the two pins of the two actuator units partially protruding from the same end portion of the housing in the axial direction.

In at least one embodiment, the electromagnetic actuator comprises a signal processing unit for converting the two detection signals of the two actuators into a processing signal in a first value range and a processing signal in a second value range, respectively,

the first and second value intervals coincide at most at one end point.

In at least one embodiment, the first interval of values and the second interval of values coincide only at one end point, which corresponds to a condition in which neither of the pins is extended.

According to a second aspect of the present invention, there is provided a camshaft phase adjustment device comprising an electromagnetic actuating device according to the present invention for adjusting the position of a camshaft of an engine, the direction of movement of the pin being perpendicular to the axis of the camshaft.

The electromagnetic actuating device has simple structure and high reliability. The camshaft phase adjustment device according to the invention has in particular the same advantages.

Drawings

FIG. 1 is a cross-sectional view of an electromagnetic actuating device according to one embodiment of the present invention (with the electromagnetic actuating device in an initial position).

FIG. 2 is a schematic view of an electromagnetic actuating device in a first position according to an embodiment of the present invention.

FIG. 3 is a schematic view of an electromagnetic actuating device in a second position according to an embodiment of the present invention.

FIG. 4 is a schematic illustration of the movement of a first pin of an electromagnetic actuating device to a fully extended state according to one embodiment of the present invention.

FIG. 5 is a schematic illustration of a first pin of an electromagnetic actuating device in an unextended state according to an embodiment of the present invention.

Fig. 6 is a graph of a detection signal of the first magnetic field detection means and a magnetic field strength in the vicinity of the first magnetic field detection means as the first pin reciprocates in the electromagnetic actuating device according to one embodiment of the present invention.

Fig. 7 is a schematic diagram of a connection circuit of two magnetic field detection devices of an electromagnetic actuating device and a signal processing unit according to an embodiment of the present invention.

Fig. 8 is a schematic diagram of a processed signal of the detection signal of the first magnetic field detection device in the electromagnetic actuator according to one embodiment of the present invention after being converted by the signal processing unit.

Fig. 9 is a schematic diagram of a processed signal of the detection signal of the second magnetic field detection device in the electromagnetic actuator according to an embodiment of the present invention after being converted by the signal processing unit.

Fig. 10 is a schematic view of the arrangement of two pins and corresponding two magnetic members and two magnetic field detection devices of an electromagnetic actuating device according to an embodiment of the present invention.

Description of the reference numerals

A P1 first pin; a P2 second pin; m1 a first magnetic member; m2 a second magnetic member; s1, a first magnetic field detection device; s2, a second magnetic field detection device; an SP spring; a PS signal processing unit; sgH processing signals;

VD1 first divider circuit; VD2 second voltage division circuit; an OA1 first processing unit; an OA2 second processing unit;

h, a shell; an H1 main housing; an H2 end housing;

10 an electromagnet; 11 coils; 12 an armature; 13 a push rod; 14 static iron cores; 15 levers; axial direction A; r is radial.

Detailed Description

Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the detailed description is intended only to teach one skilled in the art how to practice the invention, and is not intended to be exhaustive or to limit the scope of the invention.

During the movement of the pin of the electromagnetic actuator, one possible way is to fix a magnet on the pin in order to detect the position of movement of the pin. The change in the magnetic field is detected using a fixed magnetic field detection device to determine the position of the pin movement.

However, since the pin moves at a high speed and mechanically collides with the groove wall during the operation of the electromagnetic actuator, the magnet fixed to the pin is at risk of falling or failing (e.g., demagnetization).

The inventors have made the present invention in consideration of some cases including the above-described case.

With reference to fig. 1 to 10, an electromagnetic actuating device according to the present application and its operating principle will be described, taking as an example an actuating device applied to adjust a camshaft of an engine. Unless otherwise specified, in the drawings, a denotes an axial direction of the electromagnetic actuator, which is parallel to an axial direction of the first pin P1 (or the second pin P2) in the electromagnetic actuator, and the axial direction of the first pin P1 or the second pin P2 is also referred to as the axial direction a for convenience of description; r denotes a radial direction of the electromagnetic actuator, which is parallel to a radial direction of the first pin P1 (or the second pin P2) in the electromagnetic actuator, and the radial direction of the first pin P1 or the second pin P2 is also referred to as the radial direction R for convenience of description.

It should be understood that although the expressions axial and radial are used herein, the electromagnetic actuating means and/or the first pin P1 and/or the second pin P2 do not necessarily have to be cylindrical or cylindrical in their entirety, the axial direction a may correspond to the length direction of the first pin P1 and/or the second pin P2, and the radial direction R may correspond to a direction perpendicular to the axial direction a described above.

Referring to fig. 1, the electromagnetic actuating device according to the present application includes a housing H and two actuating units partially housed in the housing H.

The first execution unit comprises an electromagnet 10, a first magnetic piece M1, a first magnetic field detection device S1 and a first pin P1; the second actuator unit includes an electromagnet 10, a second magnetic member M2, a second magnetic field detection device S2, and a second pin P2.

The housing H includes a main housing H1 and an end housing H2. The main housing H1 is mainly used to accommodate two electromagnets 10, and the end housing H2 is mainly used to accommodate two pins. The end housing H2 is provided with two through-holes running through in the axial direction a, through which each pin passes and by means of which the pins are guided in their movement in the axial direction a.

The first and second actuator units are arranged side by side, symmetrically, so that the axial directions of the first and second pins P1 and P2 are parallel. And the first pin P1 and the second pin P2 partially protrude from the same end portion in the axial direction a of the housing H. Hereinafter, the end of the first pin P1 and the second pin P2 protruding from the housing H is referred to as an outer end, and the end of the first pin P1 and the second pin P2 located in the housing H is referred to as an inner end.

A spring SP is provided between the pin (first pin P1 or second pin P2) and the end housing H2, and applies a biasing force to the pin toward the inside of the housing. The pin can be driven by the electromagnet 10 to compress the spring SP to increase the length of the protrusion from the housing H. After the driving force of the electromagnet 10 is reduced or removed, the pin can be retracted at least partially into the housing H by the spring S.

The outer end of the pin is intended to project into a groove provided in a camshaft of the engine, the axis of the camshaft being perpendicular to the axial direction a of the pin. During the reciprocating movement of the pin in the axial direction a, the camshaft can be displaced along its axis, thus providing different valve lifts.

In particular, the groove of the camshaft may be formed spirally on the outer circumferential surface of the camshaft, i.e., the groove is a spiral groove. When the camshaft rotates, since the positions of the first pin P1 and the second pin P2 in the axial direction of the camshaft are fixed, the spiral groove abuts against the first pin P1 or the second pin P2, thereby displacing the camshaft in the axial direction thereof.

Each electromagnet 10 may include a coil 11, an armature 12, a push rod 13, a stationary core 14, and a lever 15.

The armature 12 is fixedly connected to the push rod 13, and the push rod 13 is made of a non-magnetic material (e.g., stainless steel). The push rod 13 abuts against the middle of the lever 15, and the lever 15 is made of a non-magnetic material, for example. To avoid interference of the action of the electromagnet 10 with the magnetic field detection means.

One end (hereinafter referred to as a fulcrum end) of the lever 15, which is close to the radially outer side of the electromagnetic actuator, is a fulcrum, and one end (hereinafter referred to as a pushing end) of the lever 15, which is close to the radially inner side of the electromagnetic actuator, abuts against an end of the pin (the first pin P1 or the second pin P2) located inside the housing H. In the axial direction a, the stroke of the pushing end of the lever 15 is greater than the stroke of the middle part of the lever 15, which makes it possible to have a greater stroke of the pin than the stroke of the push rod 13. That is, the lever 15 functions to amplify the stroke of the acting member, and for example, the pin can move 2 units for every 1 unit of distance moved by the push rod 13 in the axial direction a. This corresponds to an increase in the response speed of the electromagnetic actuator.

Furthermore, the use of the lever 15 also makes it possible that, in the radial direction R, the action part (e.g., the armature 12) of the electromagnet 10 is farther from the magnetic members (the first magnetic member M1 and the second magnetic member M2) and the magnetic field detection means (the first magnetic field detection means S1 and the second magnetic field detection means S2) described below than the pin, so that the influence of the electromagnet 10 on the detection signal of the magnetic field detection means is small (the influence can be ignored).

The magnetic members (the first magnetic member M1 and the second magnetic member M2) and the magnetic field detection devices (the first magnetic field detection device S1 and the second magnetic field detection device S2) are both fixedly disposed with respect to the inside of the housing H.

The first magnetic member M1 and the first magnetic field detection means S1 are disposed in the vicinity of the inner end of the first pin P1, and the second magnetic member M2 and the second magnetic field detection means S2 are disposed in the vicinity of the inner end of the second pin P2.

The magnetic member is, for example, a permanent magnet, and the magnetic field detection device is, for example, a hall sensor. The pin is made of a magnetically conductive material, or at least the end (upper or inner end) of the pin inside the housing H comprises a magnetically conductive material. The magnetic conductive material is preferably a soft magnetic material.

During the reciprocating motion of the first pin P1 along the axial direction A, the detection signal of the first magnetic field detection device S1 changes, so that the position of the first pin P1 in the axial direction A can be determined; during the reciprocating movement of the second pin P2 in the axial direction a, the detection signal of the second magnetic field detection device S2 changes, so that the position of the second pin P2 in the axial direction a can be determined.

Alternatively, the first magnetic member M1, the first magnetic field detection device S1 and the first pin P1 at least partially coincide, and the second magnetic member M2, the second magnetic field detection device S2 and the second pin P2 at least partially coincide, as viewed in the axial direction a.

Alternatively, a line connecting the south pole and the north pole of the first magnetic member M1 is parallel to the axial direction a, and a line connecting the south pole and the north pole of the second magnetic member M2 is parallel to the axial direction a.

Alternatively, the centers of the first magnetic member M1 and the first magnetic field detection device S1 are both on the axis of the first pin P1, and the centers of the second magnetic member M2 and the second magnetic field detection device S2 are both on the axis of the second pin P2.

Alternatively, in the axial direction a, the first magnetic field detection device S1 is located between the first magnetic member M1 and the first pin P1, and the second magnetic field detection device S2 is located between the second magnetic member M2 and the second pin P2.

First round pin P1 all is not direct contact with first magnetic field detection device S1 and first magnetism spare M1, and second round pin P2 all is not direct contact with second magnetic field detection device S2 and second magnetism spare M2 to avoid the round pin to collide with magnetic field detection device or magnetism spare in the motion process.

Alternatively, the first magnetic field detection device S1 may be directly connected to the first magnetic member M1, and the second magnetic field detection device S2 may be directly connected to the second magnetic member M2. For example, the first magnetic field detection device S1 is adhered to the first magnetic member M1, and the second magnetic field detection device S2 is adhered to the second magnetic member M2.

Next, referring to fig. 1 to 5, how the magnetic field detection device determines the position of the pin according to the change of the detection signal will be described by taking the first execution unit as an example.

It is defined that in the state shown in fig. 1, both the first pin P1 and the second pin P2 are in a non-extended state (or more precisely, corresponding to a state in which the first pin P1 and the second pin P2 are extended from the housing H during the reciprocating movement by a minimum dimension), which is also referred to as being in the initial position C0. In the condition shown in fig. 2, the first pin P1 is in a fully extended condition (or more precisely, a condition corresponding to a maximum extension of the first pin P1 out of the housing H during the reciprocating movement), and the second pin P2 is in a non-extended condition, in which the electromagnetic actuating device is also referred to as being in the first position C1. In the condition shown in fig. 3, the first pin P1 is in a non-extended condition and the second pin P2 is in a fully extended condition, in which the electromagnetic actuating device is also referred to as being in the second position C2.

Referring to fig. 4, when the first pin P1 is fully extended, the distance between the first pin P1 and the first magnetic member M1 is large, and the influence of the first pin P1 on the magnetic field of the first magnetic member M1 is small and negligible. Assuming that one end of the first magnetic member M1 facing the first pin P1 in the axial direction a is an N pole (north pole) and the other end is an S pole (south pole), the magnetic field measured by the first magnetic field detection device S1 is the magnetic field of the first magnetic member M1 itself, and the lines of magnetic induction return from the north pole of the first magnetic member M1 to the south pole of the first magnetic member M1.

Referring to fig. 5, when the first pin P1 is not extended, the distance between the first pin P1 and the first magnetic member M1 is very small, for example, not more than 1mm. At this time, the first pin P1 made of the soft magnetic material is magnetized by the first magnetic member M1 to have magnetism. For example, the inner end of the first pin P1 in FIG. 5 would be magnetized to form a south pole. The first pin P1 and the first magnetic member M1 will attract each other, and the magnetic field strength therebetween increases. The magnetic field measured by the first magnetic field detection device S1 is a magnetic field in which the first magnetic member M1 itself and the first pin P1 are strongly attracted to each other, so that the detection signal of the first magnetic field detection device S1 in this state is greater than the detection signal when the first pin P1 is fully extended.

Since the soft magnetic material is easily magnetized when approaching the magnet and easily demagnetized when being away from the magnet, the intensity of the detection signal of the first magnetic field detection device S1 is positively correlated with the distance of the first pin P1 from the first magnetic member M1 in the axial direction a.

It should be understood that positive correlation herein includes the intensity of the detection signal being a linear function of the distance, and also includes the intensity of the detection signal being a non-linear function of the distance.

The solid line in fig. 6 shows the positional relationship of the intensity of the detection signal to the first pin P1, and the long dashed line shows the positional relationship of the magnetic field intensity to the first pin P1.

The ordinate on the left side in fig. 6 is the detection signal SgO in units of VDC (direct current voltage volts); the ordinate on the right in fig. 6 represents the magnetic field strength SgM in T (tesla), and the abscissa represents the position of the electromagnetic actuating device. As can be seen from the figure, during the retraction of the first pin P1 (switching of the electromagnetic actuator from the first position C1 to the initial position C0), the first magnetic field detection means S1 detect an increase of the signal from a minimum value Sg1 to a maximum value Sg2; the first pin P1 is extended in the opposite direction.

It should be understood that the detection of the magnetic field signal by the second actuator unit is similar to that of the first actuator unit, for example, during the retraction of the second pin P2 (switching of the electromagnetic actuator from the second position C2 to the initial position C0), the detection signal increases from a minimum value Sg1 to a maximum value Sg2; the extending process of the second pin P2 is reversed.

Referring to fig. 7, in order to simplify the device structure so that the output line of the sensor signal does not occupy an interface of an ECU (electronic control unit) too much, the electromagnetic actuator of the present embodiment further includes a signal processing unit PS.

The signal processing unit PS is configured to convert the two detection signals of the two execution units into a processing signal SgH located in a first value interval and a processing signal SgH located in a second value interval, where the first value interval and the second value interval coincide only at end points. The end points at which these sections overlap are hereinafter referred to as overlapping end points, and the overlapping end points indicate positions at which neither the first pin P1 nor the second pin P2 extends.

It will be appreciated that the first and second value intervals may also not coincide at all.

Preferably, the first pin P1 and the second pin P2 do not move simultaneously in a direction away from the electromagnet 10. More preferably, the electromagnets of the two actuators are not energised simultaneously so that during movement of one pin, the other pin remains in a non-extended position.

Thus, the positions of the first pin P1 and the second pin P2 can be uniquely determined from the processed signal SgH.

Referring to fig. 6 and 8, the signal processing unit can convert the detection signal of the first magnetic field detection device S1 in the section [ Sg2, sg1] into the processing signal in the section [ S11, S12], and correspondingly, the detection signal value Sg2 is converted into the processing signal value S11, and the detection signal value Sg1 is converted into the processing signal value S12. The signal processing unit can convert the detection signal in the section [ Sg2, sg1] of the second magnetic field detection device S2 into the processing signal in the section [ S21, S22], and accordingly, the detection signal value Sg2 is converted into the processing signal value S21 and the detection signal value Sg1 is converted into the processing signal value S22.

For example, when the first pin P1 is fully extended, the detection signal of the first magnetic field detection device S1 reaches the minimum value of 0V, and the processed signal SgH =5V is output after being processed by the signal processing unit PS; when the first pin P1 is not extended, the detection signal of the first magnetic field detection device S1 reaches a maximum value of 5V, and a processed signal SgH =2.5V which is output after being processed by the signal processing unit PS; that is, correspondingly, the signal processing unit PS converts the signal in the section [0v,5v ] of the first magnetic field detection device S1 into the signal in the section [5v,2.5v ]. When the second pin P2 is completely extended, the detection signal of the second magnetic field detection device S2 reaches the minimum value of 0V, and the processed signal SgH =0V is output after being processed by the signal processing unit PS; when the second pin P2 is not extended, the detection signal of the second magnetic field detection device S2 reaches the maximum value of 5V, and the processed signal SgH =2.5V is output after being processed by the signal processing unit PS; that is, correspondingly, the signal processing unit PS converts the signal in the section [0v,5v ] of the first magnetic field detection device S1 into the signal in the section [0v,2.5v ].

Returning to fig. 7, an implementation of processing the detection signal by the signal processing unit PS is described.

The signal processing unit PS includes a first voltage dividing circuit VD1, a second voltage dividing circuit VD2, a first processing unit OA1, and a second processing unit OA2. V1 and VG in the figure are an input voltage line and a ground line, respectively.

The first voltage divider VD1 is connected to an output of the first magnetic field detection means S1 and to an input of the first processing unit OA 1.

The first voltage divider circuit VD1 is used to reduce the detection signal Sg10 of the first magnetic field detection device S1, for example, to halve the value of the signal, and to convert the signal in the interval [0v,5v ] into a signal in the interval [0v,2.5v ].

The first processing unit OA1 is configured to perform an arithmetic processing on the output signal of the first voltage divider VD1, for example, by subtracting the output signal of the first voltage divider VD1 from a half of the maximum value of the detection signal of the first magnetic field detection device S1 (for example, a half of 5V is 2.5V) to obtain a processed signal Sg11. Alternatively, the first processing unit OA1 multiplies the output signal of the first voltage divider VD1 by-1, and then adds half of the maximum value of the detection signal of the first magnetic field detection device S1. The signal Sg11 ranges from [2.5V,0V ].

The second voltage divider circuit VD2 is connected to the output of the second magnetic field detection device S2 and the input of the second processing unit OA2, and the second voltage divider circuit VD2 is used to reduce the detection signal Sg20 of the second magnetic field detection device S2, for example, to halve the value of the signal, and convert the signal in the interval [0v,5v ] into a signal in the interval [0v,2.5v ].

The second processing unit OA2 is used to process both the output signal Sg21 from the second voltage dividing circuit VD2 and the output signal Sg11 from the first processing unit OA 1.

For the output signal Sg11 from the first processing unit OA1, the second processing unit OA2 outputs the signal plus half of the maximum value of the detection signal as the processed signal SgH. As for the output signal Sg21 from the second voltage dividing circuit VD2, the second processing unit OA2 outputs the signal directly as the processed signal SgH.

According to the above-described conversion rule, the processed signal SgH can be restored to the detection signal of the first magnetic field detection device S1 and the detection signal of the second magnetic field detection device S2, respectively, so that the movement state and position of the first pin P1 and the second pin P2 can be known.

For example, when the value of the processed signal SgH is greater than 2.5V, it indicates that the first pin P1 is at least partially extended; when the value of the processed signal SgH is equal to 5V, it indicates that the first pin P1 is fully extended. When the value of the processed signal SgH is less than 2.5V, it indicates that the second pin P2 is at least partially extended. When the value of the processed signal SgH is equal to 0V, it indicates that the second pin P2 is fully extended. When the value of the processed signal SgH is equal to 2.5V, it indicates that neither the first pin P1 nor the second pin P2 is extended. Of course, according to a specific operation rule, the extending distance of the pin in the extending state can be known, and details are not described.

The invention has at least one of the following advantages:

(i) Since the magnetic member is fixed relative to the housing H without reciprocating with the pin, the magnetic member is not easily detached or damaged.

(ii) The magnetic part and the magnetic field detection device are relatively static, the detected magnetic field intensity is more accurate, and the position control of the pin is more accurate.

(iii) The output signals of the two sensors are processed into a segmented signal by the signal processing unit for outputting, so that the output circuit of the electromagnetic actuating device is simplified, and only one output port can be arranged.

Of course, the present invention is not limited to the above-described embodiments, and those skilled in the art can make various modifications to the above-described embodiments of the present invention without departing from the scope of the present invention under the teaching of the present invention. For example:

(i) The electromagnetic actuating device according to the present application may have only one actuating unit.

(ii) Referring to fig. 10, the arrangement directions of the magnetic poles of the first magnetic member M1 and the second magnetic member M2 from the two actuators, respectively, may be opposite, that is, the south pole of one magnetic member may face the pin, and the north pole of the other magnetic member may face the pin. Of course, the magnetic poles of the two magnetic members may be arranged in the same direction.

(iii) The present application is not limited to this way of processing the output signals of the two execution units.

Alternatively, the output signals of the two execution units may be output by different lines to the same or different processing units for separate processing.

Even when the output signals of the two execution units are processed so as not to coincide or only the end points (the end points here may represent the same value in the signal curve, for example, the same voltage, instead of a certain point in the signal curve) coincide, other processing units or operation methods may be employed as long as the processing signal of the first execution unit and the processing signal of the second execution unit can be transmitted in the same line and can be easily distinguished.

(iv) The electromagnetic actuating device according to the invention can actuate other devices in addition to the camshaft of the engine.

Claims (10)

1. An electromagnetic actuating device comprising a housing (H) and at least one actuating unit comprising an electromagnet (10) and a pin which partially protrudes out of the housing (H) and which is intended to be reciprocated in an axial direction (A) by the electromagnet (10), characterized in that,

the actuator unit further comprising a magnetic element for detecting the position of the pin and a magnetic field detection device, both arranged stationary with respect to the housing (H), the pin being axially spaced from the magnetic element during movement away from or towards the magnetic element and being capable of influencing the magnetic field around the magnetic element,

the magnetic field detection means are adapted to detect a change in a magnetic field signal around the magnetic member so as to enable determination of the position of the pin in the axial direction (A).

2. Electromagnetic actuating device according to claim 1, characterized in that the intensity of said detection signal is linearly related to the distance of said pin from said magnetic element in said axial direction (a).

3. Electromagnetic actuating device according to claim 1, characterized in that the line connecting the south and north poles of said magnetic member passes through or is parallel to said axial direction (a).

4. Electromagnetic actuating device according to claim 1, characterized in that said magnetic field detection means are arranged between said magnetic member and said pin in said axial direction (a).

5. The electromagnetic actuating device of claim 1, wherein the pin is disposed axially coaxially with the magnetic member.

6. The electromagnetic actuating device of claim 1, wherein the pin is made of a material comprising a soft magnetic material.

7. The electromagnetic actuating device according to any one of claims 1 to 6, characterized in that there are two of said actuating units, two of said actuating units being arranged side by side, the two pins of both of said actuating units partially protruding from one and the same end in the axial direction (A) of said housing (H).

8. Electromagnetic actuating device according to claim 7, characterized in that it comprises a signal processing unit (PS) for converting the two detection signals of the two execution units into a processing signal lying in a first interval of values and a processing signal lying in a second interval of values, respectively,

the first and second value intervals coincide at most at one end point.

9. Electromagnetic actuating device according to claim 8, characterized in that said first interval of values and said second interval of values coincide at only one end point, corresponding to a condition in which neither of said pins is extended.

10. A camshaft phase adjustment device, characterized by comprising the electromagnetic actuating device of any one of claims 1 to 9 for adjusting the position of a camshaft of an engine, the direction of movement of the pin being perpendicular to the axis of the camshaft.

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