CN215369975U

CN215369975U - Electromagnetic actuator and camshaft phase adjusting device

Info

Publication number: CN215369975U
Application number: CN202120972456.XU
Authority: CN
Inventors: 黄宁; 黎志伟; 罗培培
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Holding China Co Ltd
Priority date: 2021-04-23
Filing date: 2021-05-08
Publication date: 2021-12-31
Anticipated expiration: 2031-05-08
Also published as: CN115234336A

Abstract

The utility model provides an electromagnetic actuator and a camshaft phase adjusting device. The electromagnetic actuating device comprises a shell, a coil positioned in the shell, a first pin and a second pin which are arranged in parallel and partially extend out of the shell, wherein the first pin and the second pin are respectively used for reciprocating along the axial directions of the first pin and the second pin under the action of a first armature and a second armature, the electromagnetic actuating device further comprises a magnetic member and a magnetic field detection device which are arranged statically relative to the shell, the reciprocating motion of the first pin and/or the second pin along the axial direction can cause the change of a magnetic field around the magnetic member, and the magnetic field detection device is used for detecting the change of the magnetic field around the magnetic member, so that the position of the first pin and/or the second pin in the axial direction can be determined. The electromagnetic actuating device has simple structure and high reliability.

Description

Electromagnetic actuator and camshaft phase adjusting device

Reference to related applications

The present invention claims priority from an invention patent application entitled "electromagnetic actuating device and camshaft phase adjustment device", entitled "202110441358.8," filed in china on 23/4/2021, which is incorporated herein by reference in its entirety.

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 the slider to move along the axial direction of the cam shaft to realize different valve lifts.

SUMMERY OF THE UTILITY MODEL

The utility model 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, a coil located within the housing, and first and second pins juxtaposed and partially protruding from the housing, the first and second pins being adapted to reciprocate axially of the first and second pins under the action of first and second armatures, respectively, the movement of the first and second armatures being effected by energisation of a stationary coil, wherein,

the electromagnetic actuating means further comprises a magnetic member arranged stationary with respect to the housing and magnetic field detection means,

the reciprocating motion of the first pin and/or the second pin along the axial direction can cause the magnetic field around the magnetic part to change, and the magnetic field detection device is used for detecting the change of the magnetic field around the magnetic part, so that the position of the first pin and/or the second pin in the axial direction can be determined.

In at least one embodiment, in a state where the first pin and the second pin are protruded out of the housing by a minimum size, the detection signal of the magnetic field detection device has an initial value,

a detection signal of the magnetic field detection means is not less than the initial value during the reciprocating motion of the first pin,

during the reciprocating motion of the second pin, a detection signal of the magnetic field detection device is not greater than the initial value.

In at least one embodiment, the detection signal of the magnetic field detection device has a curve profile when the first pin is moved out of the housing, which curve profile is opposite to the curve profile of the detection signal of the magnetic field detection device when the second pin is moved out of the housing.

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

In at least one embodiment, the magnetic member is disposed opposite to ends of the first pin and the second pin facing the coil in the axial direction, and the magnetic field detection device is located between the first pin and the second pin.

In at least one embodiment, the magnetic member is located between the first pin and the second pin as viewed in the axial direction, and the distance between the first pin and the magnetic member is equal to the distance between the second pin and the magnetic member.

In at least one embodiment, the magnetic member comprises a permanent magnet, and/or

The magnetic field detection device is a Hall sensor.

In at least one embodiment, the first pin and the second pin at least partially overlap with the magnetic field detection device in the axial direction when the first pin and the second pin are not extended.

In at least one embodiment, when the first pin and the second pin are not extended, the end portions of the first pin and the second pin facing the coil are not more than 1mm away from the magnetic member in the axial direction.

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 first and second pins 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 utility model has the same advantages.

Drawings

FIG. 1 is a cross-sectional view of an electromagnetic actuating device according to one embodiment of the present invention.

Fig. 2 is a schematic view of the distribution of lines of magnetic induction of a magnetic member with both pins in an unextended state of an electromagnetic actuator according to an embodiment of the present invention.

Fig. 3 is a cross-sectional view of the solenoid actuated device shown in fig. 1 with the first pin unextended and the second pin fully extended.

Fig. 4 is a schematic diagram illustrating the distribution of magnetic flux lines of the magnetic member in the state corresponding to fig. 3.

Fig. 5 is a cross-sectional view of the electromagnetic actuator shown in fig. 1 with the second pin unextended and the first pin fully extended.

Fig. 6 is a schematic diagram illustrating the distribution of magnetic flux lines of the magnetic member in the state corresponding to fig. 5.

Fig. 7 and 8 are schematic views of two arrangement positions of the magnetic member as viewed in the axial direction.

Fig. 9 is a graph of a detection signal of the magnetic field detection means in the electromagnetic actuating device according to the embodiment of the present invention as the second pin reciprocates.

Fig. 10 is a graph of a detection signal of the magnetic field detection means in the electromagnetic actuating device according to the embodiment of the present invention as the first pin reciprocates.

Description of the reference numerals

A P1 first pin; a P2 second pin; an M magnetic member; a Sn magnetic field detection device; s spring;

s0 initial value; SH forward maximum; SL inverse maximum; c1 first position; a second position of C2; a first direction X1; a second direction X2;

h, a shell; h1 main housing; h2 end housing;

10 an electromagnet; 11 a coil; 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 utility model, and is not intended to be exhaustive or to limit the scope of the utility model.

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 movement position 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 present invention has been made in view of some of the circumstances including the above-described circumstances.

Referring to fig. 1 to 6, unless otherwise specified, a indicates the axial direction of the electromagnetic actuator, which is coincident with the axial direction of the first pin P1 (or the second pin P2) in the electromagnetic actuator; r denotes a radial direction of the electromagnetic actuator, which is coincident with a radial direction of the first pin P1 (or the second pin P2) in the electromagnetic actuator.

It should be understood that, although the expressions axial and radial are used herein, the electromagnetic actuating device 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 first to fig. 1, an electromagnetic actuating device according to the present application will be described, taking as an example an actuating device applied to adjust a camshaft of an engine.

The device comprises a shell H, wherein two electromagnets 10 are arranged in the shell H. The coil 11 of each electromagnet 10 is fixed relative to the housing H, and the armature of the electromagnet can reciprocate in the axial direction a depending on the different energization conditions of the coil 11. The armature 12 of each electromagnet 10 is used to drive one pin (one of the first pin P1 and the second pin P2) to reciprocate in the axial direction a.

Specifically, the electromagnet 10 includes 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 material of the push rod 13 is, for example, 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.

One end of the lever 15 close to the radially outer side of the electromagnetic actuator (hereinafter referred to as a fulcrum end) is a fulcrum, and one end of the lever 15 close to the radially inner side of the electromagnetic actuator (hereinafter referred to as a pushing end) 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 the pin can move 2 units of distance per 1 unit of distance moved by the push rod 13 in the axial direction a, for example. This corresponds to an increase in the response speed of the electromagnet.

Furthermore, the use of the lever 15 also makes it possible to move the actuating part (e.g., the armature 12) of the electromagnet 10 farther away from the magnetic member M and the magnetic field detection device Sn described below than the pin in the radial direction R, so that the electromagnet 10 has less influence on the detection signal of the magnetic field detection device Sn.

One end of the pin extends out of the housing H and the other end of the pin is located in the housing H and driven by the electromagnet 10.

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

Between the pin and the end housing H2, a spring S is provided, which applies a pretension force to the pin towards the interior of the housing, so that the pin can be retracted at least partially into the housing H by the spring S after the drive force of the electromagnet 10 has been reduced or removed.

One 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 position of the first pin P1 or the second pin P2 in the axial direction of the camshaft is fixed, the spiral groove abuts against the first pin P1 or the second pin P2, thereby displacing the camshaft in the axial direction thereof.

A magnetic material M and a magnetic field detector Sn are provided near the other end of the pin. The magnetic member M is, for example, a permanent magnet, and the magnetic field detection device Sn is, for example, a hall sensor. The material of which the pin is made comprises a magnetically conductive material, or at least the end (upper end) of the pin located inside the housing H comprises a magnetically conductive material.

The magnetic member M and the magnetic field detection device Sn are both fixed to the housing H. Optionally, the magnetic member M is located between the two pins, viewed in the axial direction a; and preferably the magnetic means M are equidistant from both pins. For example, referring to fig. 7 and 8, the magnetic member M may be located at a midpoint of a line connecting the first pin P1 and the second pin P2 (as shown in fig. 7) or may be located on a perpendicular bisector of a line connecting the first pin P1 and the second pin P2 (as shown in fig. 8) as viewed in the axial direction a.

Optionally, the magnetic field detection device Sn faces the magnetic member M. For example, the magnetic field detection means Sn is equally distanced from both pins as viewed in the axial direction a.

Alternatively, the magnetic field detection means Sn is located between the magnetic member M and the pin (the first pin P1 and the second pin P2) in the axial direction a.

Alternatively, at some positions during the reciprocation of the pin (the first pin P1 or the second pin P2), the pin has a portion overlapping the magnetic field detection device Sn in the axial direction a. I.e. in certain positions, the pin will move to a region partly overlapping the magnetic field detection means Sn in the axial direction a. In one non-limiting example, the pin at least partially overlaps the magnetic field sensing device Sn when the pin is not extended (retracted) (see two pins in fig. 1, a first pin P1 in fig. 4, and a second pin P2 in fig. 6), and does not overlap the magnetic field sensing device Sn when the pin is fully extended (see a second pin P2 in fig. 4). Alternatively, the amount of overlap of the pin with the magnetic field detection device Sn may be inconsistent when the pin is extended and retracted.

Alternatively, during the reciprocating motion of the two pins, each pin does not move in the axial direction a to overlap the magnetic member M.

Preferably, the line connecting the north pole and the south pole of the magnetic member M is parallel to the axial direction a, for example, in the case where the magnetic member M is a bar magnet, the axis of the magnetic member M is parallel to the axial direction a.

Next, how the magnetic field detection device Sn determines the position of the armature based on a change in the detection signal will be described with reference to fig. 1 to 6 and fig. 9 and 10.

(neither the first pin P1 nor the second pin P2 is extended)

Defining the condition shown in fig. 1 and 2, both pins are in a non-extended condition (or more precisely, a condition corresponding to a minimum size of the extension of the pins out of the housing H during their reciprocal movement), corresponding to the first position C1 in fig. 9 and 10.

For example, in fig. 2, if the lower end of the magnetic member M is an N pole (north pole), two pins are distributed on both sides of the magnetic field detection device Sn (the first pin P1 is located in front of the first direction X1 with respect to the magnetic member M, and the second pin P2 is located in front of the second direction X2 with respect to the magnetic member M), and the distances between the two pins and the magnetic member M are substantially equal, the magnetic fields of the magnetic member M are distributed relatively equally in the first direction X1 and the second direction X2, and the magnetic field intensity detected by the magnetic field detection device Sn directly below the magnetic member M is an initial value S0.

(the first pin P1 is not extended, the second pin P2 is fully extended)

Referring to fig. 3 and 4, the first pin P1 is in a non-extended state, the second pin P2 is in a fully extended state (or more precisely, a state in which the pin extends out of the housing H to the maximum extent during reciprocation), and the second pin P2 corresponds to the second position C2 in fig. 9.

In this state, the first pin P1 is closer to the magnetic member M than the second pin P2, and the magnetic field strength is greater in the vicinity of the first pin P1; or in abstract terms, the magnetic induction lines tend to be more concentrated toward the first direction X1 than toward the second direction X2.

Fig. 9 shows a change in the detection signal obtained by the magnetic field detection device Sn during the process from the non-protrusion to the full protrusion of the second pin P2. The ordinate in the figure represents the detection signal, and the abscissa represents the position of the second pin P2. As can be seen from the figure, the detection signal gradually increases from the initial value S0 to the positive direction to the positive maximum value SH in the process of extending the second pin P2.

(first pin P1 is fully extended and second pin P2 is not extended)

Referring to fig. 5 and 6, the first pin P1 is in a fully extended state and the second pin P2 is in an unextended state, the first pin P1 corresponding to the second position C2 of fig. 10.

In this state, the second pin P2 is closer to the magnetic member M than the first pin P1, and the magnetic field strength is greater in the vicinity of the second pin P2; or in abstract terms, the magnetic induction lines tend to be more concentrated toward the second direction X2 than toward the first direction X1.

Fig. 10 shows a change in the detection signal obtained by the magnetic field detection device Sn during the process from the non-protrusion to the full protrusion of the first pin P1. The ordinate in the figure represents the detection signal, and the abscissa represents the position of the first pin P1. As can be seen from the figure, the detection signal gradually increases from the initial value S0 to the negative direction to the reverse maximum value SL during the extension of the first pin P1.

As can be seen from fig. 9 and 10, during the process of extending the pin (the first pin P1 or the second pin P2) (or switching from the first position C1 to the second position C2), the strength of the detection signal (the absolute value of the difference between the detection signal and the initial value S0) is positively correlated with the extending length of the pin. Alternatively, the strength of the detection signal is linearly related to the distance of the pin from the magnetic member M in the axial direction a. It should be understood that the linear correlation herein includes a positive correlation and a negative correlation, and the intensity of the detection signal may be a linear function of the distance or a non-linear function of the distance.

The direction of change in the value of the detection signal is different during the reciprocation of the first pin P1 from during the reciprocation of the second pin P2. The "direction of change in value" here includes a direction in which the measurement value of the detection signal becomes larger and a direction in which the measurement value becomes smaller with respect to the initial value S0.

Thus, not only whether both pins are not extended, the second pin P2 is fully extended, and the first pin P1 is fully extended can be judged by comparing whether the detection signal is equal to the initial value S0, the forward maximum value SH, and the reverse maximum value SL, respectively, but also the extension lengths of the first pin P1 and the second pin P2 can be judged by referring to the graphs in fig. 9 and 10.

Preferably, in the axial direction a, the two pins do not move simultaneously in the same direction. Preferably, during the movement of one pin, the other pin is stationary. Preferably, during the movement of one pin, the other pin remains in the unextended state. Alternatively, the coils 11 of the two electromagnets 10 are not energized simultaneously.

Alternatively, when the first pin P1 and the second pin P2 are in the non-extended state, the distance between the two pins and the magnetic member M in the axial direction a is not more than 1mm, for example, 0.5mm to 1mm, where the distance is the minimum distance.

It will be appreciated that since the magnetically permeable part of the electromagnet 10 of the electromagnetic actuator is relatively far from the magnetic member M (both in the radial direction R and in the axial direction a), the effect of the action of the armature 12, for example, on the detection signal of the magnetic field in the vicinity of the magnetic field detection means Sn is very small. Further, other operating members in the vicinity of the magnetic field detection device Sn are preferably made of a non-magnetic material.

The utility model has at least one of the following advantages:

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

(ii) The magnetic member M and the magnetic field detection device Sn are relatively static, the measured magnetic field intensity is more accurate, and the position control of the pin is more accurate.

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:

the electromagnetic actuating device according to the utility model can actuate other devices besides the camshaft of the engine.

Claims

1. An electromagnetic actuator device comprising a housing, a coil located within the housing, and first and second pins juxtaposed and partially protruding from the housing, the first and second pins being adapted to reciprocate axially along the first and second pins, respectively, under the action of first and second armatures, the movement of which is effected by energisation of a stationary coil, characterised in that,

2. The electromagnetic actuator according to claim 1, characterized in that a detection signal of the magnetic field detection device has an initial value in a state where the first pin and the second pin protrude from the housing in a size where both the first pin and the second pin are minimum in size,

3. Electromagnetic actuating device according to claim 2, characterized in that the course of the detection signal of the magnetic field detection device when the first pin is running outside the housing is opposite to the course of the detection signal of the magnetic field detection device when the second pin is running outside the housing.

4. The electromagnetic actuating device of claim 2, wherein the strength of the detection signal is linearly related to the distance of the first pin from the magnetic member in the axial direction, and the strength of the detection signal is linearly related to the distance of the second pin from the magnetic member in the axial direction.

5. The electromagnetic actuator device according to claim 1, wherein the magnetic member is disposed opposite to ends of the first pin and the second pin facing the coil in the axial direction, and the magnetic field detection device is located between the first pin and the second pin.

6. The electromagnetic actuating device of claim 1, wherein the magnetic member is located between the first pin and the second pin as viewed in the axial direction, and a distance between the first pin and the magnetic member is equal to a distance between the second pin and the magnetic member.

7. Electromagnetic actuating device according to any of claims 1 to 6, characterized in that the magnetic element comprises a permanent magnet, and/or

The magnetic field detection device is a Hall sensor.

8. The electromagnetic actuating device according to any one of claims 1 to 6, wherein the first pin and the second pin at least partially overlap with the magnetic field detection device in the axial direction when the first pin and the second pin are not extended.

9. The electromagnetic actuator device according to any one of claims 1 to 6, characterized in that when the first pin and the second pin are not extended, ends of the first pin and the second pin that face the coil are not more than 1mm away from the magnetic member in the axial direction.

10. A camshaft phase adjusting 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 first pin and the second pin being perpendicular to the axis of the camshaft.