CN114255958A

CN114255958A - Electromagnetic actuator

Info

Publication number: CN114255958A
Application number: CN202111310696.4A
Authority: CN
Inventors: 周强; 李进; 张金伟; 董杙钞; 刘锐
Original assignee: Mianyang Fulin Jinggong Co ltd
Current assignee: Mianyang Fulin Jinggong Co ltd
Priority date: 2021-11-08
Filing date: 2021-11-08
Publication date: 2022-03-29
Anticipated expiration: 2041-11-08
Also published as: CN114255958B

Abstract

The invention relates to the technical field of automobile engines, in particular to an electromagnetic actuator which comprises an electromagnetic part and an execution part, wherein the electromagnetic part is connected with a power supply and used for generating a magnetic pole; the executing part comprises a moving mechanism which moves relative to the electromagnetic part, and a permanent magnet unit is fixedly connected to the moving mechanism; the permanent magnet unit is hermetically arranged, so that impurities are prevented from contacting the permanent magnet unit; the permanent magnet unit is connected with the valve core unit in a magnetic attraction mode and drives the valve core unit to be close to or far away from the electromagnetic part. Aim at sets up permanent magnet seal, can avoid the permanent magnet to adsorb impurity to hinder the motion of dabber.

Description

Electromagnetic actuator

Technical Field

The invention belongs to the technical field of automobile engines, and particularly relates to an electromagnetic actuator.

Background

In current electromagnetic devices that adjust the cam displacement of an engine, it is known to change the axial position of a sleeve that is rotatable integrally with a shaft and moves relatively in the axial direction of a camshaft of the shaft. The electromagnetic actuator is a driving mechanism for driving the cam sleeve to move, and the engine controller gives a control signal according to the actual working condition requirement of the engine to drive the electromagnetic actuator to act so as to realize the axial movement of the cam sleeve on the cam shaft and further realize the displacement of the cam to achieve the purpose of adjusting the valve lift.

However, the existing cam shift electromagnetic actuator has the following disadvantages:

1. the end face of the cover plate unit is in contact with the end face of the iron core, the end face of the iron core is abraded greatly after being durable, and burrs are generated at an orifice, so that the movement of the mandrel is hindered, and the performance and the reliability of the electromagnetic actuator are influenced;

2. the permanent magnet of the existing cam displacement electromagnetic actuator is not sealed, magnetic conduction impurities such as iron scraps in engine oil are easily adsorbed by the magnet for a long time, and the impurities can be formed to block the movement of the mandrel, so that the performance and the reliability are influenced.

Disclosure of Invention

In order to solve the problems, the invention provides an electromagnetic actuator, wherein a permanent magnet is arranged in a sealing manner, so that the permanent magnet can be prevented from adsorbing impurities, and the movement of a mandrel is prevented from being hindered; the blind hole matched with the mandrel is also arranged in a chamfer manner, so that a cavity capable of containing burrs is formed, the influence of the burrs on the movement of the mandrel is reduced, and the contact area of the iron core unit and the permanent magnet is reduced, so that the permanent magnet can be quickly separated from the iron core unit when a current is applied to generate a magnetic pole, and the actuator can quickly act.

The technical scheme adopted by the invention is as follows: an electromagnetic actuator comprises an electromagnetic part and an execution part, wherein the electromagnetic part is connected with a power supply and is used for generating a magnetic pole, and the execution part is close to/far away from the electromagnetic part under the action of the magnetic pole; the executing part comprises a moving mechanism which moves relative to the electromagnetic part, and a permanent magnet unit is fixedly connected to the moving mechanism; the permanent magnet unit is hermetically arranged, so that impurities are prevented from contacting the permanent magnet unit; the permanent magnet unit is connected with the valve core unit in a magnetic attraction mode and drives the valve core unit to be close to or far away from the electromagnetic part.

Preferably, an annular seat ring is sleeved at one end of the moving mechanism and fixedly connected with the moving mechanism, a first groove is formed in the annular seat ring, the permanent magnet unit is arranged in the first groove, a cover plate is fixedly connected to the annular seat ring, and the cover plate is in contact with the electromagnetic part.

Preferably, the annular seat ring comprises an inner ring and an outer ring, the inner ring is in contact connection with the moving mechanism, the outer ring is far away from the moving mechanism, and the height of the inner ring is higher than that of the outer ring; the upper surface of the cover plate is not higher than the height of the inner ring.

Preferably, the moving mechanism is a mandrel, the mandrel is hollow, a clamping groove is formed in one end of the mandrel, the length of the clamping groove is equal to the height of an inner ring of the annular seat ring, and the inner ring is matched with the clamping groove.

Preferably, the annular race is made of a material having a high magnetic reluctance, the spindle is made of a non-soft magnetic material, and the cover plate is made of a soft magnetic material.

Preferably, the electromagnetic part comprises an iron core unit and a solenoid unit, the solenoid unit is arranged outside the iron core unit, the iron core unit is connected with the permanent magnet unit in a magnetic attraction mode, and the solenoid unit is connected with the power supply.

Preferably, the iron core unit is provided with a second groove, an opening of the second groove is formed in one end close to the permanent magnet unit, the mandrel is arranged in the second groove, one end of the mandrel extends out of the second groove and is connected with the annular seat ring, the mandrel slides relative to the second groove, and the depth of the second groove is larger than the movement stroke of the mandrel.

Preferably, the edge of the second groove is provided with a chamfer, a cavity is formed between the chamfer and the mandrel, the edge of the inner ring is arranged in the cavity, and one end of the iron core unit, which is provided with the chamfer, is in contact with the cover plate.

Preferably, the iron core unit is provided with a chamfer end and is connected with the front plate unit, the front plate unit is separated from the cover plate, and the iron core unit and the front plate unit are both made of soft magnetic materials.

Preferably, the permanent magnet units are permanent magnets, the number of the moving mechanisms is two, each moving mechanism is correspondingly provided with one valve core unit, and the axis of each valve core unit is parallel to and not coaxial with the axis of each moving mechanism.

The invention has the advantages that:

1) the permanent magnet is arranged in the sealed annular seat ring, so that the permanent magnet is prevented from adsorbing impurities, and the movement of the mandrel is prevented; according to the invention, the blind hole matched with the core shaft is arranged by adopting the chamfer, when burrs are generated by the collision of the iron core and the cover plate, the burrs and impurities can be accommodated due to the chamfer, so that the movement of the core shaft is not hindered, and the performance and reliability of the electromagnetic actuator are ensured; the contact area of the iron core unit and the permanent magnet can be reduced, so that when current is applied to generate a magnetic pole, the permanent magnet can be quickly separated from the iron core unit, and the actuator can quickly act;

2) the annular seat ring is arranged into a shape with a high inner ring and a low outer ring, the inner ring is higher than the cover plate, welding is facilitated, the inner ring is matched with the chamfer angle of the blind hole, the iron core is directly connected with the cover plate in a magnetic attraction mode, the cover plate bears the impact force from the iron core, and damage to the annular seat ring during long-term work is avoided.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a partially enlarged view.

In the figure: 1-an electromagnetic part; 2-a solenoid unit; 3-an iron core unit; 4-a front plate unit; 5-cover plate; 6-annular seat ring; 7-a permanent magnet unit; 8-mandrel; 9-a valve housing unit; 10-a cartridge unit; 15-a second groove; 16-a first groove; 17-a cavity; 18-an outer ring; 20-inner ring; 23-chamfering; 24-outer shell.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1-2, an electromagnetic actuator includes an electromagnetic part 1 and an executing part, the electromagnetic part 1 is connected with a power supply for generating a magnetic pole, and the executing part is close to/far from the electromagnetic part under the action of the magnetic pole. When the electromagnetic part is electrified, the electromagnetic part generates an electrode to adsorb or repel the execution part, so that the execution part is close to/far away from the electromagnetic part.

The executing part comprises a moving mechanism which moves relative to the electromagnetic part, and a permanent magnet unit 7 is fixedly connected to the moving mechanism; the permanent magnet unit 7 is hermetically disposed so as to prevent impurities from contacting the permanent magnet unit 7; the sealing mode of the permanent magnet unit 7 is that one end of the moving mechanism is sleeved with the annular seat ring 6, the annular seat ring 6 is fixedly connected with the moving mechanism, namely the annular seat ring 6 is sleeved at one end of the moving mechanism, a first groove 16 is arranged in the annular seat ring 6, the permanent magnet unit 7 is arranged in the first groove 16, the shape of the permanent magnet unit 7 is matched with that of the first groove 16, the annular seat ring 6 is fixedly connected with the cover plate 5, and the cover plate 5 is contacted with the electromagnetic part.

The permanent magnet unit 7 is magnetically connected with the valve core unit 10, and the permanent magnet unit 7 drives the valve core unit 10 to approach/leave the electromagnetic part. When the electromagnetic part and the power supply are powered off, the permanent magnet unit 7 is adsorbed on the electromagnetic part, meanwhile, the valve core unit 10 is also adsorbed on the permanent magnet unit 7, when the electromagnetic part is powered on to generate a magnetic pole, the magnetic pole is opposite to the permanent magnet, repulsive force is generated, the repulsive force enables the moving mechanism to move axially, and therefore the valve core unit 10 is pushed, and the valve core unit 10 is arranged in the valve sleeve unit 9 and can slide and rotate in the axial direction, so that the camshaft switching function is realized.

The annular seat ring 6 further comprises an inner ring 20 and an outer ring 18, wherein the inner ring 20 is in contact connection with the moving mechanism, the outer ring 18 is far away from the moving mechanism, and the height of the inner ring 20 is higher than that of the outer ring 18; the upper surface of the cover plate 5 is not higher than the height of the inner ring 20. The height of the inner ring 20 of the annular seat ring 6 is set higher than that of the cover plate 5, so that one end of the cover plate 5 is abutted against the side wall of the inner ring 20, and the other end is covered on the outer ring 18, thereby facilitating welding and bearing impact force.

The moving mechanism is a mandrel 8, the mandrel 8 is hollow, a clamping groove is formed in one end of the mandrel 8, the length of the clamping groove is equal to the height of an inner ring 20 of the annular seat ring 6, and the inner ring 20 is matched with the clamping groove.

The annular seat 6 is made of a material having a high magnetic resistance so as to prevent the magnetic flux generated from the permanent magnet unit 7 from being concentrated toward the spool unit 10, the core shaft 8 is made of a non-soft magnetic material, and the cover plate 5 is made of a soft magnetic material so as to secure the attraction force of the permanent magnet unit 7.

The electromagnetic part 1 comprises an iron core unit 3 and a solenoid unit 2, the solenoid unit 2 is arranged outside the iron core unit 3, the iron core unit 3 is connected with a permanent magnet unit 7 in a magnetic attraction mode, and the solenoid unit 2 is connected with a power supply. The electromagnetic part 1 is externally provided with a shell 24, the interior of the electromagnetic part contains a solenoid unit 2 and an iron core unit 3 fixed in the solenoid unit 2, the shell 24, the cover plate 5, the iron core unit 3 in the electromagnetic part 1 and the shell 24 form a magnetic circuit, and through the electrification and the outage of the solenoid unit 2, a magnetic pole opposite to a permanent magnet is generated, so that a repulsive force is generated, and the permanent magnet unit 7 moves towards a direction far away from the iron core unit 3.

Be provided with second recess 15 on the iron core unit 3, the uncovered setting of second recess 15 is in the one end that is close to permanent magnet unit, dabber 8 sets up in second recess 15, the one end of dabber 8 stretches out in second recess 15 and is connected with annular seat circle 6, dabber 8 slides for second recess 15, the degree of depth of second recess 15 is greater than the motion stroke of dabber 8.

The edge of second recess 15 sets up chamfer 23, vacuole formation 17 between chamfer 23 and the dabber 8, when permanent magnetism unit 7 moves, iron core unit 3 produces the striking with apron 5, and the burr that forms after the striking can be held to cavity 17, and the burr of avoiding producing leads to dabber 8's motion to be obstructed, cavity 17 is arranged in to the inner circle edge, iron core unit 3 sets up the one end of chamfer 23 and contacts with apron 5.

Iron core unit 3 sets up and connects front bezel unit 4 on the one end of chamfer 23 for when solenoid unit 2 circular telegram, electromagnetism portion 1, front bezel unit 4, iron core unit 3 and back plate (set up in iron core unit 3 top in figure 1) constitute a confined magnetic field return circuit, produce N level or S level' S line of feeling, front bezel unit 4 and apron 5 are separated from each other, iron core unit 3 and front bezel unit 4 are made by soft magnetic material.

The permanent magnet units 7 are permanent magnets, in this embodiment, preferably, two or one or three moving mechanisms are symmetrically arranged, each moving mechanism is correspondingly provided with one valve core unit 10, the axis of each valve core unit 10 is parallel to and not coaxial with the axis of the moving mechanism, and the two groups of symmetrical valve core units 10 are arranged close to each other.

The specific working mode is as follows: according to the implementation mode of the invention, two groups of identical iron core units 3 are arranged, the iron core units 3 are fixed in the solenoid unit 2, a second groove 15 is arranged in each iron core unit 3, a through hole (hollow) is formed in the core shaft 8, the permanent magnet unit 7 is completely wrapped and sealed by the annular seat ring 6 and the cover plate 5 and is arranged on the core shaft 8, the annular seat ring 6 and the cover plate 5 are fixedly connected with the core shaft 8 into a whole, the cover plate 5 is made of a magnetic conductive material, the front plate unit 4 is also made of a magnetic conductive material, when the solenoid unit 2 is powered off, the permanent magnet is adsorbed on the iron core units 3, and meanwhile, the valve core unit 10 is also adsorbed and is positioned at an initial position.

When solenoid unit 2 circular telegram, iron core unit 3 produces the magnetic pole opposite with the permanent magnet, the repulsion force makes the permanent magnet to the direction motion of keeping away from iron core unit 3, thereby drive 8 axial direction motions of keeping away from iron core unit 3, promote valve core unit 10, realize the camshaft switching function, second recess 15 mouth department sets up chamfer 23 on the iron core unit 3, when iron core unit 3 and apron 5 striking production burrs, owing to there is chamfer 23, can hold burr impurity, consequently, can not hinder the motion of dabber 8, electromagnetic actuator performance and reliability are ensured.

The above embodiments are preferred embodiments, it should be noted that the above preferred embodiments should not be considered as limiting the invention, and the scope of protection of the invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.

Claims

1. An electromagnetic actuator, characterized by: the electromagnetic device comprises an electromagnetic part (1) and an execution part, wherein the electromagnetic part (1) is connected with a power supply and is used for generating a magnetic pole, and the execution part is close to/far away from the electromagnetic part under the action of the magnetic pole; the execution part comprises a moving mechanism which moves relative to the electromagnetic part, and a permanent magnet unit (7) is fixedly connected to the moving mechanism; the permanent magnet unit (7) is hermetically arranged, so that impurities are prevented from contacting the permanent magnet unit (7); the permanent magnet unit (7) is connected with the valve core unit (10) in a magnetic attraction mode, and the permanent magnet unit (7) drives the valve core unit (10) to be close to/far away from the electromagnetic part.

2. The electromagnetic actuator of claim 1, wherein: an annular seat ring (6) is sleeved at one end of the moving mechanism, the annular seat ring (6) is fixedly connected with the moving mechanism, a first groove (16) is formed in the annular seat ring (6), the permanent magnet unit (7) is arranged in the first groove (16), a cover plate (5) is fixedly connected to the annular seat ring (6), and the cover plate (5) is in contact with the electromagnetic part.

3. The electromagnetic actuator of claim 2, wherein: the annular seat ring (6) comprises an inner ring (20) and an outer ring (18), the inner ring (20) is in contact connection with the moving mechanism, the outer ring (18) is far away from the moving mechanism, and the height of the inner ring (20) is higher than that of the outer ring (18); the upper surface of the cover plate (5) is not higher than the height of the inner ring (20).

4. The electromagnetic actuator of claim 3, wherein: the moving mechanism is a mandrel (8), the mandrel (8) is hollow, a clamping groove is formed in one end of the mandrel (8), the length of the clamping groove is equal to the height of an inner ring (20) of the annular seat ring (6), and the inner ring (20) is matched with the clamping groove.

5. The electromagnetic actuator of claim 4, wherein: the annular seat ring (6) is made of a material with high magnetic resistance, the mandrel (8) is made of a non-soft magnetic material, and the cover plate (5) is made of a soft magnetic material.

6. The electromagnetic actuator according to any one of claims 1 to 5, wherein: the electromagnetic part (1) comprises an iron core unit (3) and a solenoid unit (2), the solenoid unit (2) is arranged outside the iron core unit (3), the iron core unit (3) is magnetically attracted with a permanent magnet unit (7) and connected with the power supply, and the solenoid unit (2) is connected with the power supply.

7. The electromagnetic actuator of claim 6, wherein: be provided with second recess (15) on iron core unit (3), the uncovered setting of second recess (15) is in the one end that is close to permanent magnetism unit, dabber (8) set up in second recess (15), the one end of dabber (8) stretches out in second recess (15) and is connected with annular seat circle (6), dabber (8) slide for second recess (15), the degree of depth of second recess (15) is greater than the movement stroke of dabber (8).

8. The electromagnetic actuator of claim 7, wherein: the edge of the second groove (15) is provided with a chamfer (23), a cavity (17) is formed between the chamfer (23) and the mandrel (8), the edge of the inner ring () is arranged in the cavity (17), and one end of the iron core unit (3) provided with the chamfer (23) is contacted with the cover plate (5).

9. The electromagnetic actuator of claim 8, wherein: iron core unit (3) set up one of chamfer (23) and serve and connect front bezel unit (4), front bezel unit (4) and apron (5) are separated mutually, iron core unit (3) and front bezel unit (4) are made by soft magnetic material.

10. The electromagnetic actuator of claim 1, wherein: the permanent magnet units (7) are permanent magnets, the moving mechanisms are symmetrically arranged in two numbers, each moving mechanism is correspondingly provided with one valve core unit (10), and the axis of each valve core unit (10) is parallel to and not coaxial with the axis of each moving mechanism.