KR101223447B1 - Orifice-plate for an engine-mount filled with the magnetorheological fluid - Google Patents

Abstract

PURPOSE: An orifice plate for an engine mount filled with magneto-rheological fluid is provided to control the flow feature of the magneto-rheological fluid more efficiently. CONSTITUTION: An orifice plate for an engine mount filled with magneto-rheological fluid includes a coil assembly(30) and a core. The coil assembly comprises a coil(31) and a coil cover(32), and be applied about current from outside. A coil is winded to form a ring shape. The coil cover is combined with the coil in order to prevent the coil from directly contacting the magneto-theological fluid. A core is formed in a disk shape, and is formed being separated in a upper core(20) and a lower core(10) in order to install the coil assembly inside. The upper core and the lower core are combined at the upper and lower side of the coil assembly. A first flow path(100), a second flow path(200), and a third flow path(300) are formed inside and outside along the circumference of the core and are open in the bent form over all. The magneto-rheological fluid flowing the upper side and lower side of the core through the fluid path passes the inside and outside of the coil assembly. [Reference numerals] (AA) Bolt hole

Description

Orifice plate for an engine-mount filled with the Magnetorheological fluid

The present invention relates to an orifice plate mounted in a hydraulic engine mount using an MR fluid (Magnetorheological fluid), more specifically so that the flow path through which the MR fluid flows through the inside and outside of the coil assembly An orifice plate for an engine mount in which an MR fluid formed in a curved binary form is enclosed.

The engine of the vehicle is installed in the engine compartment of the vehicle body through the engine mount so as to damp the vibration of the engine. The engine mount is mainly used as a rubber mount (rubber mount) using the elastic force of the material and a hydromount to attenuate the vibration by using a viscous resistance according to the liquid flow by the liquid is sealed inside.

Of these, hydro engine mounts are widely used in various vehicles because they are configured to simultaneously attenuate vibrations in the high frequency region and the low frequency region.

1 is a cross-sectional view of a hydro engine mount having a conventional structure. The hydro engine mount is accommodated in the hydro space in the inner space formed by the insulator (2) and the diaphragm (7), the inner space is equipped with an orifice plate (4) partitioned into the upper liquid chamber (3) and the lower liquid chamber (4) do.

The orifice plate 4 has a flow-path 5 formed therein so that hydro fluid flows inwardly along the rim, and a decoupler 8 may be selectively mounted at the center thereof. Then, the stud 1 coupled with the insulator 2 is coupled with the bracket of the engine. Therefore, the elastic insulator 2 repeats elastic compression and restoration according to the load change and the vibration applied to the stud 1, and the hydro fluid flows through the flow passage 5 to the upper liquid chamber 3 and the lower liquid chamber 6 ) Will flow. The flow of the hydrolyzate vibrates the decoupler 8, but the vibration of the high frequency region is attenuated by the vibration of the decoupler 8, and the vibration of the low frequency region is attenuated by the flow of the hydroliquid through the flow path 5. Has a structure.

On the other hand, the hydro mount may be MR fluid is encapsulated in place of the normal hydro liquid. Magnetorheological fluid is a suspension solution in which magnetic particles are mixed with a synthetic hydrocarbon liquid. The shear stress varies depending on whether a magnetic field is formed and the strength of the magnetic field.

Accordingly, the orifice plate 4` of the hydro mount in which the MR fluid is enclosed is formed with a flow path 5` in a vertical direction as shown in FIG. 2, and generates a magnetic field around the flow path 5` through which the MR fluid passes. Coil 9 is additionally laid to form. And, by controlling the amount of current applied to the coil (9) is configured to adjust the dynamic stiffness and attenuation characteristics of the mount in accordance with the driving conditions of the vehicle.

On the other hand, the MR fluid has a flow characteristic similar to that of a typical hydro-liquid when no magnetic field is formed, but when the magnetic field is formed around the particles, the flow becomes different because the particles form heat.

In other words, when the magnetic field is not formed, the shear stress of the MR fluid is calculated as a product of viscosity and shear rate, but when the magnetic field is formed, the shear stress of the MR fluid is viscous and shear rate. The yield shear stress is added to the product of. The yield shear stress increases in proportion to the strength of the magnetic field applied.

However, in order to arrange the particles in the MR fluid so as to be perpendicular to the flow direction, as shown in FIG. 2, the flow direction of the MR fluid and the direction of forming the magnetic field should be perpendicular to each other.

However, the conventional method has a structure in which coils are arranged at one side of the flow path at a predetermined interval. In the "A" section and the "C" section, the magnetic field is perpendicular to the flow direction of the MR fluid. Since it does not pass, the control efficiency is lowered.

Therefore, in the past, the current value applied to the coil was increased or the flow path was formed longer to make up for the lowered control efficiency, but there was a problem of increasing the amount of heat and / or volume.

Therefore, it is a primary object of the present invention to provide a structure of an orifice plate which can solve the above problems and more efficiently control the flow characteristics of the MR fluid.

The present invention for achieving the above object, In the orifice plate for the MR-mounted engine mount, the coil assembly wound coil to form a ring; And a core in which the coil assembly is embedded and formed in a disc shape, and an entrance of one side is located at an upper surface thereof and a channel is formed to be located at a lower side of the entrance of the other side. The MR fluid is formed inside and outside of the coil assembly in the coil. The flow path is formed to be bent around the coil assembly so as to flow through it.

The core has a cup-shaped but the lower core is formed in the center of the cylindrical center portion projecting upward; And a disk-shaped upper core coupled to the center portion, wherein the coil assembly is mounted between the upper core and the lower core so that the center portion is centered.

The core may include: a first flow passage formed in a circular shape so that the core is opened up and down at an outer side of the coil assembly; and a second flow passage formed in a circular shape so as to open the core up and down inside the coil assembly; And a third flow path formed in a circular shape so that the core is opened up and down along the circumference of the second flow path, and an upper flow guide connecting the second flow path and the third flow path is coupled to an upper surface of the core. A lower flow path guide connecting the first flow path and the second flow path is coupled to a lower surface of the core to form a flow path.

At least one of the first channel, the second channel, and the third channel is provided with a plurality of ribs in the vertical direction. The rib is formed from the lower core to the upper end so as to partition the flow path.

In addition, the upper core and the lower core are made of a material having a higher relative magnetic permeability than the upper euro guide and the lower euro guide.

According to the present invention having the above configuration, since the flow path is configured to pass through the inner and outer sides of the coil assembly, the effective section in which the magnetic field acts (the section in which the magnetic fluid flow direction and the magnetic field are perpendicular to each other) is increased, thereby more efficiently There is an effect that can control the flow characteristics.

Therefore, based on the same control efficiency, by applying a lower current to the coil assembly can suppress the increase in the amount of heat generated, there is an effect that the coil assembly can be made smaller.

In addition, the conventional flow path is formed in a straight shape in the vertical direction, the damping function is greatly reduced when the coil assembly and the controller failure, the orifice plate according to the invention is formed to bend to ensure a sufficient flow path length, the flow path using the rib Since the cross-sectional area can be adjusted, even if the magnetic field is not formed due to the failure of the coil assembly and the controller, an appropriate damping resistance can be caused when the MR fluid flows, thereby providing a minimum damping function.

1 is a cross-sectional view of a typical hydro engine mount,
FIG. 2 is a view illustrating an arrangement state of MR fluid particles according to a conventional orifice plate structure mounted on a hydro engine mount in which MR fluid is enclosed and whether magnetic fields are formed;
3 is a perspective view showing a state in which the orifice plate is cut in accordance with a preferred embodiment of the present invention,
4 is an exploded perspective view of FIG. 3;
5 is a perspective view showing a top view and a cutaway view of a lower core according to a preferred embodiment of the present invention;
6 is a perspective view showing a plan view and a cutaway view of an upper core according to a preferred embodiment of the present invention;
Figure 7 is a cross-sectional view showing the effective periods of the magnetic field formed when the MR fluid flow in the orifice plate according to a preferred embodiment of the present invention.

Hereinafter, an orifice plate for an engine mount in which MR fluid is encapsulated according to an exemplary embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

Referring to Figures 3 and 4, the orifice plate according to the present invention is a ring-shaped coil assembly is built in the disk-shaped core, the sinusoidal wave shape (such as sine wave_) to pass through the inside and the outside of the coil assembly That is, the flow path is formed so that the cross-sectional shape forms a parabola surrounding the coil.

The coil assembly 30 includes a coil 31 wound to form a ring shape, and a coil cover 32 coupled to the coil 31 to prevent the coil 31 from directly contacting the MR fluid. It is configured to receive a current from. In addition, the inner circumferential surface and the outer circumferential surface of the coil assembly 30 form a flat surface because they form part of the flow path in the orifice plate.

The core has a disk shape as a whole, and is separated into an upper core 20 and a lower core 10 so that the coil assembly 30 can be mounted therein.

As shown in FIG. 5, the lower core 10 has a cup shape in which a rim portion 10a protrudes to a predetermined height along a circumference of a disc-shaped bottom surface 10b on which the coil assembly 30 is seated. The center portion 10c protrudes from the center so that the core 20 can be seated thereon, and holes 100a, 200a, and 300a having different diameters are formed in a radial shape at predetermined intervals to form a flow path. That is, the holes 100a, 200a, and 300a are formed in a ring shape along the circumference, and portions divided by the holes 100a, 200a, and 300a are formed in the respective ribs 11a, 11b, and 11c. Is connected by. In addition, the ribs 11a and 11c may be selectively formed up to the upper end of the edge portion in order to control the flow of the MR fluid so that the MR fluid flows efficiently along the flow path without rotating around the circumference in the core during MR fluid flow. Can be. The ribs may change the thickness of each rib to improve control efficiency or to generate a certain level of damping even under conditions in which magnetic fields cannot be generated due to a failure of the coil assembly and the controller. have.

The upper core 20 is a disk shape having the same outer diameter as the outer diameter of the coil assembly 30, as shown in Figure 6, the holes 200b, 300b of different diameters are formed along the circumference to form a flow path The portions 20a, 20b, 20c partitioned by the holes 200b, 300b are likewise connected by ribs 21a, 21b. The central portion 20c of the upper core 20 has a bolt hole and a lower end thereof protrudes convexly to be seated in a groove formed in the center of the center portion 10c of the lower core 10 and the bolt of the lower core 10. Opened with the hall. The upper core 20 is coupled to the upper coil assembly 30 is seated on the lower core 10 and fixed by bolting.

Meanwhile, as the lower core 10 and the upper core 20 are coupled to each other above and below the coil assembly 30 as described above, as illustrated in FIG. 2, the first passage 100 and the second passage ( 200 and the third flow path 300 are formed in and out along the circumference of the core. That is, the first flow path 100 is formed outside the coil assembly 20 in the core, and the second flow path 200 is formed inward, and the inside of the second flow path 200 is formed in the core. The third flow path 300 is formed in the center portion. In addition, an upper flow guide 40 and a lower flow guide 50 are mounted to the upper side and the lower side of the core so that the passages are connected to each other.

The lower flow guide 50 has a ring shape and is formed in a shape in which a track groove is formed concave downward along a circumference to open the first flow path 100 and the second flow path 200 at the lower end of the lower core 10. Let's do it. Similarly, the upper flow guide 40 has a ring shape and is formed in a shape in which a track groove is formed to be concave upward along the circumference so that the second flow path 200 and the third flow path 300 form an upper end of the upper core 20. Open from.

As described above, as the upper flow guide 40 and the lower flow guide 50 are combined, the first flow path 100, the second flow path 200, and the third flow path 300 have a curved shape as a whole. It is opened. Therefore, the MR fluid flowing through the upper and lower sides of the core through the flow path passes through the inner and outer sides of the coil assembly 30.

As shown in FIG. 7, the orifice plate according to the present invention further increases the flow characteristics of the MR fluid since the effective periods E in which the flow direction of the MR fluid and the magnetic field form a right angle are doubled in comparison with the conventional structure. It can be controlled efficiently.

Meanwhile, the upper core 20 and the lower core 10 are made of a material having high relative magnetic permeability and the upper flow guide 40 so that the magnetic lines of force are concentrated in the MR fluid flow to improve the efficiency of the control of the flow characteristics. ) And the lower euro guide 50 is preferably made of a material having a low specific permeability.

As the orifice plate according to the present invention increases the effective period of the magnetic field, it is possible to suppress the heat generation by applying a smaller current in comparison with the conventional structure at the same size, and has a more delicate control effect.

As described above, the embodiments disclosed in the present specification and drawings are only illustrative of specific examples in order to facilitate understanding of the present invention, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

10: lower core
20: upper core
30: coil assembly
40: upper side euro guide
50: lower side euro guide

Claims (5)

In an orifice plate for engine mounts containing MR fluid,
A coil assembly in which a coil is wound to form a ring shape; And
Includes the core assembly and is formed in a disk shape, the entrance of one side is located in the upper surface and the core is formed so that the flow path is located on the lower surface of the other entrance;
An orifice plate for an MR mount enclosed in an engine fluid, characterized in that the flow path is formed to bend surrounding the coil assembly such that the MR fluid passes through the inner and outer sides of the coil assembly.
According to claim 1, wherein the core is a cup-shaped but the center of the cylindrical center portion protruding upwardly formed in the center; And an upper core having a disk shape coupled to the center portion, wherein the coil assembly is mounted between the upper core and the lower core so that the center portion is located at the center thereof. .
According to claim 2, wherein the core, the first flow path formed in a circular shape so that the core is opened up and down outside the coil assembly; and the second flow path formed in a circular shape so that the core is opened up and down inside the coil assembly; And a third flow passage formed in a circular shape so that the core is opened up and down along the circumference of the second flow passage.
An upper flow guide connecting the second flow path and the third flow path is coupled to an upper surface of the core, and a lower flow guide connecting the first flow path and the second flow path is coupled to a lower surface of the core to form a flow path. Orifice plate for engine mounts with sealed MR fluid.
4. The orifice plate for an engine mount, according to claim 3, wherein the lower core is provided with ribs for partitioning the flow path.
The MR fluid of any one of claims 3 to 4, wherein the upper core and the lower core are made of a material having a higher relative permeabilit than the upper euro guide and the lower euro guide. Plate for engine mounting.

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