阅读说明：本技术 一种凸轮移位电磁执行器 (Cam shift electromagnetic actuator ) 是由 周强 董杙钞 王波 于 2021-05-24 设计创作，主要内容包括：本发明涉及电磁调节技术领域,公开了一种凸轮移位电磁执行器,包括壳体,壳体内固定设置有电磁铁组件；壳体上连接有阀套,阀套内滑动设置有阀芯总成；电磁铁组件包括铁芯,铁芯朝向阀芯总成的端面设置有凹陷结构；阀芯总成包括通过磁力接近铁芯的阀芯,阀芯的上端面朝向铁芯,且阀芯的上端面与铁芯的端面保持间隙。本发明通过改进电磁铁组件与阀芯组件的配合结构,使铁芯与阀芯的端面保持一定的距离,可避免电磁执行器工作时,阀芯往返移动带来的铁芯磨损的问题；同时在阀芯上设置垫片结构,减少了与铁芯的接触面积,当润滑油进入铁芯与垫片结构之间时,通过减少接触面积降低了阀芯与铁芯分离的阻力,保证了执行器的性能。(The invention relates to the technical field of electromagnetic adjustment, and discloses a cam displacement electromagnetic actuator, which comprises a shell, wherein an electromagnet assembly is fixedly arranged in the shell; the shell is connected with a valve sleeve, and a valve core assembly is arranged in the valve sleeve in a sliding mode; the electromagnet assembly comprises an iron core, and a concave structure is arranged on the end face, facing the valve core assembly, of the iron core; the valve core assembly comprises a valve core close to the iron core through magnetic force, the upper end face of the valve core faces the iron core, and a gap is kept between the upper end face of the valve core and the end face of the iron core. According to the invention, the matching structure of the electromagnet assembly and the valve core assembly is improved, so that the iron core and the end surface of the valve core keep a certain distance, and the problem of iron core abrasion caused by the reciprocating movement of the valve core when the electromagnetic actuator works can be avoided; meanwhile, the gasket structure is arranged on the valve core, so that the contact area with the iron core is reduced, when lubricating oil enters between the iron core and the gasket structure, the resistance of separation of the valve core and the iron core is reduced by reducing the contact area, and the performance of the actuator is ensured.)

1. A cam shifting electromagnetic actuator, characterized by: comprises a shell (1), wherein an electromagnet assembly (2) is fixedly arranged in the shell (1); a valve sleeve (4) is connected on the shell (1), and a valve core assembly (3) is arranged in the valve sleeve (4) in a sliding manner; the electromagnet assembly (2) comprises an iron core (21), and a concave structure (211) is arranged on the end face, facing the valve core assembly (3), of the iron core (21); the valve core assembly (3) comprises a valve core (34) approaching the iron core (21) through magnetic force, the upper end face of the valve core (34) faces the iron core (21), and a gap is kept between the upper end face of the valve core (34) and the end face of the iron core (21).

2. The cam shifting electromagnetic actuator of claim 1, wherein: a gasket structure (31) is arranged between the valve core (34) and the iron core (21), and the gasket structure (31) is provided with a through hole (312) for the valve core (34) to pass through.

3. The cam shifting electromagnetic actuator of claim 2, wherein: the spacer structure (31) comprises a blocking spacer arranged on the valve core assembly (3), and a plurality of grooves (311) are formed in one surface, facing the iron core (21), of the blocking spacer.

4. The cam shifting electromagnetic actuator of claim 3, wherein: the separation gasket is circular, and the grooves (311) are uniformly distributed on the separation gasket along the circumference.

5. The cam shifting electromagnetic actuator of claim 1, wherein: the concave structure (211) at least comprises a spherical concave.

6. The cam shifting electromagnetic actuator of claim 1, wherein: the electromagnet assembly (2) further comprises a solenoid (22) which is arranged on the outer side of the iron core (21) in a surrounding mode.

7. The cam shifting electromagnetic actuator of claim 1, wherein: the valve core assembly (3) further comprises a magnetic ring structure arranged on the valve core (34), and one magnetic pole of the magnetic ring structure is opposite to the electromagnet assembly (2).

8. The cam shifting electromagnetic actuator of claim 7, wherein: the magnetic ring structure comprises a magnetic ring seat (33) arranged on the valve core (34), a concave cavity is arranged in the magnetic ring seat (33), and a permanent magnet (32) is arranged in the concave cavity.

Technical Field

The invention relates to the technical field of electromagnetic adjustment, in particular to an electromagnetic adjustment actuator in a variable valve lift system of an automobile engine, and specifically relates to a cam displacement electromagnetic actuator.

Background

The variable valve lift system can improve the power and the torque of an engine and reduce exhaust emission and fuel consumption, and the electromagnetic actuator is an important component of cam displacement in the variable valve lift system. In the process of adjusting the valve lift of an engine through electromagnetic equipment at present, it is known that a sleeve rotating together with a camshaft and moving along the axial direction of the camshaft is adjusted, an electromagnetic actuator is a driving mechanism driving the sleeve to move axially, and the electromagnetic actuator acts to realize the axial movement of the sleeve on the camshaft and realize the cam displacement according to a control signal given by an engine control unit in combination with actual working conditions, so as to achieve the purpose of adjusting the valve lift of the engine.

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

1. when the existing cam displacement electromagnetic actuator works, resistance generated between an iron core and an upper gasket by engine oil and magnetic force is large, and the performance of the actuator is influenced.

2. In order to improve the wear resistance of the valve core, the hardness of the valve core material is higher. And the end face of the valve core is contacted with the end face of the iron core, and the end face of the iron core is abraded greatly after the valve core is durable, so that the performance of the actuator is influenced.

Therefore, the structure of the existing cam displacement electromagnetic actuator still has a space which needs to be optimized and improved, the performance of the electromagnetic actuator is influenced by the reduction of resistance in the action process, and meanwhile, the abrasion of the end face of the iron core is caused by the contact of the end face of the valve core and the end face of the iron core, so that the performance of the actuator is reduced. Therefore, a more reasonable technical scheme needs to be provided, and the defects in the prior art are overcome.

Disclosure of Invention

In order to solve the above-mentioned drawbacks of the prior art, the present invention provides a cam shifting electromagnetic actuator, which eliminates the contact resistance and wear between a valve core and an iron core by improving the relative structure of the valve core and the iron core, improves the performance of the electromagnetic actuator, and ensures the reliability of the electromagnetic actuator in long-term use.

In order to achieve the purpose, the invention specifically adopts the technical scheme that:

a cam displacement electromagnetic actuator comprises a shell, wherein an electromagnet assembly is fixedly arranged in the shell; the shell is connected with a valve sleeve, and a valve core assembly is arranged in the valve sleeve in a sliding mode; the electromagnet assembly comprises an iron core, and a concave structure is arranged on the end face, facing the valve core assembly, of the iron core; the valve core assembly comprises a valve core close to the iron core through magnetic force, the upper end face of the valve core faces the iron core, and a gap is kept between the upper end face of the valve core and the end face of the iron core.

Above-mentioned disclosed electromagnet assembly improves through the iron core structure to electromagnet assembly, sets up the iron core towards the terminal surface of case to inside sunken structure, so forms a redundant space and takes place to contradict in the iron core in order to avoid the upper end of case. When the iron core and the valve core are in the initial rest position, the iron core and the valve core are close to each other but not in contact under the action of the magnetic force of the valve core, and after the electromagnet is electrified to generate a magnetic field, the valve core is pushed outwards under the action of the magnetic force of the electromagnet, so that the sleeve on the camshaft is pushed to move.

Further, in order to reduce the resistance between the valve core and the iron core and further avoid the abrasion, optimization is performed and one of the feasible options is provided: and a gasket structure is arranged between the valve core and the iron core, and the gasket structure is provided with a through hole for the valve core to pass through. When the scheme is adopted, after the valve core is close to the iron core, the gasket structure firstly contacts the iron core and prevents the valve core from continuously approaching the iron core, and the iron core and the valve core can be prevented from contacting and being abraded.

Still further, the gasket construction may be configured in a variety of forms, not exclusively limited thereto, optimized and one of the possible options: the gasket structure comprises a separation gasket arranged on the valve core assembly, and a plurality of grooves are formed in one surface, facing the iron core, of the separation gasket. When the scheme is adopted, the lubricating oil between the valve core and the valve sleeve upwards reaches the position between the valve core and the iron core to form resistance for preventing the valve core and the iron core from being separated, but the contact area between the gasket and the iron core is reduced by the groove, so that the resistance is reduced.

Still further, the structure of the groove is optimized, and the following feasible options are provided: the separation gasket is circular, and the grooves are uniformly distributed on the separation gasket along the circumference. When the structure is adopted, the occupied area of the groove on the separation gasket is the contact area of the reduced iron core and the separation gasket, and the resistance caused by the viscous property of lubricating oil can be effectively reduced.

Further, the recessed structure provided on the core may also be configured in various forms, which are not limited only, and is optimized and one of the possible options is as follows: the concave structure at least comprises a spherical concave.

Furthermore, besides the spherical recess, a cylindrical recess and other structures can be arranged.

Further, the electromagnet assembly is used for generating a magnetic field after being electrified, and optimization is performed and one of feasible options is provided: the electromagnet assembly further comprises a solenoid arranged around the outer side of the iron core. When the scheme is adopted, when the solenoid is electrified, a magnetic field is generated, the direction of the magnetic field just generates repulsion with the direction of the magnetic field of the valve core, and the valve core is pushed outwards.

Further, the valve core itself has magnetic force action and is close to the iron core in the natural state through the magnetic force action, and the structure of the valve core is optimized, such as one of the following feasible options: the valve core assembly further comprises a magnetic ring structure arranged on the valve core, and one magnetic pole of the magnetic ring structure is opposite to the electromagnet assembly. When the scheme is adopted, the magnetic ring generates a magnetic field, and the direction of the magnetic field is opposite to that of the magnetic field generated after the electromagnet is electrified, so that repulsive force is generated.

Further, the magnetic ring structure disclosed in the above technical solution is optimized, and the following feasible options are provided: the magnetic ring structure comprises a magnetic ring seat arranged on the valve core, a concave cavity is arranged in the magnetic ring seat, and a permanent magnet is arranged in the concave cavity. When the scheme is adopted, the magnetic field of the permanent magnet is used as the source of the magnetic force of the valve core.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the matching structure of the electromagnet assembly and the valve core assembly is improved, so that the iron core and the end surface of the valve core keep a certain distance, and the problem of iron core abrasion caused by the reciprocating movement of the valve core when the electromagnetic actuator works can be avoided; meanwhile, the gasket structure is arranged on the valve core, so that the contact area with the iron core is reduced, when lubricating oil enters between the iron core and the gasket structure, the resistance of separation of the valve core and the iron core is reduced by reducing the contact area, and the performance of the actuator is ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic view of the overall structure of the actuator of the present invention.

Fig. 2 is a schematic view of a partial structure of the iron core and the valve core of the present invention.

FIG. 3 is a general schematic view of the gasket structure of the present invention.

Fig. 4 is a schematic view of the overall structure of the iron core of the present invention.

The meaning of each reference number in the figures is: 1. a housing; 2. an electromagnet assembly; 21. an iron core; 211. a recessed structure; 22. a solenoid; 3. a valve core assembly; 31. a gasket structure; 311. a groove; 312. a through hole; 32. a permanent magnet; 33. a magnetic ring seat; 34. a valve core; 4. and (3) valve housing.

Detailed Description

The invention is further explained below with reference to the drawings and the specific embodiments.

It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Specific structural and functional details disclosed herein are merely illustrative of example embodiments of the invention. This invention may, however, be embodied in many alternate forms and should not be construed as limited to the embodiments set forth herein.

Examples

Aiming at the problems that an iron core and a valve core are collided and abraded in the working process of an electromagnetic actuator in the prior art and the current situation that the separation difficulty of the iron core and the valve core is increased due to the viscous force of lubricating oil, the embodiment is optimized and provides an optimized scheme to solve the problems in the prior art.

Specifically, the technical solution disclosed in this embodiment is:

as shown in fig. 1 to 4, a cam shift electromagnetic actuator includes a housing 1, an electromagnet assembly 2 is fixedly disposed in the housing 1; a valve sleeve 4 is connected on the shell 1, and a valve core assembly 3 is arranged in the valve sleeve 4 in a sliding manner; the electromagnet assembly 2 comprises an iron core 21, and a concave structure 211 is arranged on the end face, facing the valve core assembly 3, of the iron core 21; the valve core assembly 3 includes a valve core 34 approaching the iron core 21 by magnetic force, the upper end surface of the valve core 34 faces the iron core 21, and a gap is maintained between the upper end surface of the valve core 34 and the end surface of the iron core 21.

The electromagnet assembly 2 disclosed above is improved by the structure of the iron core 21 of the electromagnet assembly 2, and the end surface of the iron core 21 facing the valve core 34 is configured to be an inward concave structure, so that a redundant space is formed to avoid the collision of the upper end of the valve core 34 on the iron core 21. When the iron core 21 and the valve core 34 are in the initial rest position, the iron core and the valve core 34 are close to each other but not in contact with each other due to the magnetic force of the valve core 34, and after the electromagnet is electrified to generate a magnetic field, the valve core 34 is pushed outwards under the magnetic force of the electromagnet, so that the sleeve on the camshaft is pushed to move.

Preferably, in this embodiment, the structure of the iron core 21 is an inverted T shape, and a corresponding boss structure is disposed in the housing 1 and abuts against and fixes the iron core 21. The valve housing 4 comprises a circular channel along which the valve core 34 is cylindrical and slides back and forth.

In order to reduce the resistance between the core 34 and the core 21 and further avoid wear, the present embodiment is optimized and uses one of the possible options: a gasket structure 31 is arranged between the valve core 34 and the iron core 21, and the gasket structure 31 is provided with a through hole 312 for the valve core 34 to pass through. When the scheme is adopted, after the valve core 34 approaches the iron core 21, the gasket structure 31 firstly contacts the iron core 21 and prevents the valve core 34 from continuing to approach the iron core 21, so that the iron core 21 and the valve core 34 can be prevented from contacting and being worn.

The spacer structure 31 may be constructed in various forms, which are not limited only, and the present embodiment is optimized and adopts one of the possible options: the gasket structure 31 includes a blocking gasket disposed on the valve core assembly 3, and a plurality of grooves 311 are disposed on one surface of the blocking gasket facing the iron core 21. With such a scheme, when the lubricating oil between the valve core 34 and the valve sleeve 4 reaches upwards between the valve core 34 and the iron core 21, resistance for preventing the valve core 34 from being separated from the iron core 21 is formed, but the groove 311 reduces the contact area of the gasket and the iron core 21, thereby reducing the resistance.

Preferably, the structure of the recess 311 is optimized, and one of the following possible options is adopted: the blocking gasket is circular, and the grooves 311 are uniformly distributed on the blocking gasket along the circumference. With such a structure, the occupied area of the groove 311 on the blocking gasket is the contact area between the iron core 21 and the blocking gasket, which can effectively reduce the resistance caused by the viscous property of the lubricating oil.

In this embodiment, the isolation pad is made of a flexible material such as sponge or rubber, which can reduce the wear caused by contact.

The concave structure 211 provided on the core 21 can be configured in various forms, and is not limited only, and the embodiment is optimized and adopts one of the feasible options: the recessed feature 211 comprises a spherical recess.

In other embodiments, the end surface of the core 21 may be provided with a cylindrical recess instead of the spherical recess.

The electromagnet assembly 2 is used for generating a magnetic field after being electrified, and the embodiment is optimized and adopts one of the feasible options: the electromagnet assembly 2 further comprises a solenoid 22 arranged around the outside of the iron core 21. When the scheme is adopted, when the solenoid 22 is electrified, a magnetic field is generated, the direction of the magnetic field is just repulsive to the direction of the magnetic field of the valve core 34, and the valve core 34 is pushed outwards.

Preferably, the solenoid 22 surrounds the periphery of the core 21.

The valve core 34 has a magnetic force acting on itself and is close to the iron core 21 in a natural state through the magnetic force, and the structure of the valve core 34 is optimized in the embodiment, such as the following feasible options: the valve core assembly 3 further comprises a magnetic ring structure arranged on the valve core 34, and one magnetic pole of the magnetic ring structure is opposite to the electromagnet assembly 2. When the scheme is adopted, the magnetic ring generates a magnetic field, and the direction of the magnetic field is opposite to that of the magnetic field generated after the electromagnet is electrified, so that repulsive force is generated.

The magnetic ring structure disclosed in the above technical solution is optimized, and the following feasible options are given: the magnetic ring structure comprises a magnetic ring seat 33 arranged on a valve core 34, a concave cavity is arranged in the magnetic ring seat 33, and a permanent magnet 32 is arranged in the concave cavity. With this arrangement, the magnetic field passing through the permanent magnet 32 acts as a source of magnetic force for the spool 34.

The above embodiments are just exemplified in the present embodiment, but the present embodiment is not limited to the above alternative embodiments, and those skilled in the art can obtain other various embodiments by arbitrarily combining with each other according to the above embodiments, and any other various embodiments can be obtained by anyone in light of the present embodiment. The above detailed description should not be construed as limiting the scope of the present embodiments, which should be defined in the claims, and the description should be used for interpreting the claims.