KR102073385B1 - Vibration isolation bush for vehicle suspension using multi-layer coil srructured core member and magneto-rheological elastomer - Google Patents

Abstract

The present invention relates to a vibration isolation bush installed on a suspension module of a vehicle chassis, which comprises a vibration insulator consisting of a core member on which a wire coil is wound in at least two places and a magnetorheological elastic body surrounding the surface of the core member; and a housing for protecting the combination of the core member and the vibration insulator. Therefore, vibration isolation performance is maintained when a magnetic field is not applied through switching of an operator operation mode, and the steering stability of a vehicle is improved by changing the stiffness of the magnetorheological elastic body according to the strength of the magnetic field when a magnetic field is applied.

Description

VIBRATION ISOLATION BUSH FOR VEHICLE SUSPENSION USING MULTI-LAYER COIL SRRUCTURED CORE MEMBER AND MAGNETO-RHEOLOGICAL ELASTOMER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration insulator mounted on a vehicle suspension apparatus, and more particularly, to a vibration insulation bush for a vehicle suspension having a core member of a multi-stage coil structure and a vibration insulator using a magnetorheological elastic body.

In general, a bush applied to a vehicle suspension is provided as a vibration isolator for isolating the vibration generated from the engine or road running. Bushes as vibration insulators require more than a certain level of vibration insulation performance (NVH) to ensure ride comfort, quietness, and steering stability. In general, the ride quality, quietness, and steering stability are in conflict with technical characteristics. At the same time, the construction of a vibrating insulator satisfying was virtually impossible.

On the other hand, conventional bushes are generally passive type bushes that cannot be actively controlled stiffness. In particular, hydraulic bushes have tried to improve ride comfort, quietness and steering stability by using fluid viscosity. It was very slight.

Therefore, the technology of applying mounts and dampers using magneto-Rheological (MR) fluids has attracted the attention of academia and industry. However, the semi-active type of such mounts and dampers has been attracting attention. The damping force control alone has technical limitations to simultaneously satisfy the two conflicting requirements.

For reference, damping force control technology using a mount and a damper using a magnetorheological fluid is disclosed in Korean Patent Publication Nos. 11881157 and 2012-0129580.

Accordingly, the present invention was developed to solve the above problems, and an object thereof is to provide a vibration insulation bush for vehicle suspension using a core member and a magnetorheological elastic body of a multi-stage coil structure.

According to one aspect of the present invention for achieving the above object, a vibration insulating bush installed in the suspension module of the vehicle chassis, the core member is wound around at least two places and the magnetic coil surrounding the surface of the core member It consists of a vibration insulator made of a rheological elastic body, and a housing for protecting the combination of the core member and the vibration insulator, and maintains the vibration insulation performance when the magnetic field is not applied through the switching of the driver operation mode, when the magnetic field is applied A vibration isolating bush for a vehicle suspension is provided, which is configured to improve steering stability of a vehicle by changing the stiffness of the magnetorheological body according to the strength of the magnetic field.

According to the present invention, the vibration insulator is composed of a pair of corresponding structures to surround the surface of the core member, each part of the vibration insulator is in close contact with the inner wall of the housing so that the circumferential surface has a constant curvature so that it can be safely maintained against vertical swing It is formed of a concave surface of the upper and lower ends have a structure that protrudes to the outside, the inner wall surface of each portion may have a flat structure to be in close contact with the surface of the core member.

In addition, the vibration isolation bush for vehicle suspension of the present invention further comprises a stopper for absorbing the vibration or large displacement transmitted to the chassis or suspension of the vehicle, the stopper is made of a predetermined elastic material, the core member and the vibration It may be configured to surround at least the top or bottom of the combination of insulators and extend from the top to the bottom of the housing, the housing is a cylindrical metal material of the upper and lower openings, both sides of the inner wall corresponding to the concave surface of the vibration insulator Convex surfaces are formed, and mounting grooves into which a part of the stopper is inserted are formed at right angles to the convex surfaces. In addition, the connecting portion of each part constituting the vibration insulator is fixed to be securely held on the inner wall of the housing against the left and right swing by the stopper, the stopper is formed so as to span along the top and bottom of the housing, And an extension part which connects the lower mounting part and the corresponding end of the inner circumference of these upper and lower mounting parts and is inserted into the seating groove of the housing.

From the above-described features, the present invention can improve the steering stability of the vehicle by securing the ride comfort, quietness of the vehicle and increasing the dynamic stiffness of the bush depending on whether the magnetic field is applied. Can be satisfied at the same time. In addition, by applying the magnetic rheology elastic body to a vehicle that is actually mass-produced, it is possible to pursue the advanced technology of the vehicle by securing the original technology, technology preemption effect, and replacing the existing product.

1 is an assembled perspective view of a vibration insulating bush for vehicle suspension according to the present invention,
FIG. 2 is a perspective view of the elements constituting the vibration isolation bush of FIG. 1;
3 is a perspective view showing the assembled state of the core member and the vibration insulator shown in FIG.
4 is an assembled cross-sectional view of the vibration isolation bush for vehicle suspension of FIG.
5 is a view showing a manufacturing process of the vibration insulating bush for the vehicle suspension of FIG.

Further details and advantages of the invention are described in detail below with reference to one embodiment of the invention shown in the accompanying drawings.

In the following examples, the drawings and descriptions thereof are omitted except for the inevitable parts in describing the invention, and like reference numerals designate like elements throughout the specification, and detailed description thereof will not be repeated. .

The vibration isolation bush as a semi-active type vibration insulator using the magneto-rheumatic elastomer (MRE) of the present invention has a vibration insulation performance when the magnetic field is not applied through the switching of the driver's operation mode. In the case of maintaining quietness and riding comfort, and applying a magnetic field, the steering stability of the vehicle is improved by changing the stiffness of the magnetorheological body according to the strength of the magnetic field.

Magnetorheological elastomers (MRE) are made of natural rubber and silicone rubber in combination with iron powder (Carbonyl Iron Particle, CIP) in an appropriate ratio, and has a certain elasticity when no magnetic field is applied (i.e., current off). It has a low resonant frequency in a soft state, and the vibration isolation performance is excellent. On the contrary, in the state in which the magnetic field is applied (current on state), the stiffness is increased due to the viscoelastic change due to the alignment of the iron powder particles (CIP), so that the steering resonance can be improved. As described above, the magnetorheological elastic body can constitute a vibration insulation bush as a semi-active type vibration insulator that simultaneously controls vibration variation and ride comfort / pilot stability (R & H) by controlling the stiffness change through magnetic field application.

In one embodiment, the vibration insulating bush 1 using the magnetorheological elastic body of the present invention is a core member 10 of a multi-stage coil (eg, two-stage or three-stage) structure and a magnetic body surrounding at least a part of the core member. Vibration insulator 20 formed of rheological elastic material (MRE), housing 30 for protecting the coupling structure of the core member 10 and the vibration insulator 20, and vibration and large displacement transmitted to the vehicle chassis or suspension module It includes a stopper 40 for absorbing. Here, the stopper 40 has a predetermined elastic material, and is configured to surround at least the top or bottom of the combination of the core member 10 and the vibration insulator 20 and extend from the top to the bottom of the housing 30. It absorbs vibrations and large displacements transmitted from such a configuration to the vehicle chassis or suspension.

1 is an assembled perspective view of a vibration insulating bush for vehicle suspension according to the present invention, Figure 2 is a perspective view of the elements constituting the vibration insulating bush of Figure 1, Figure 3 is an assembly of the vibration member and the core member shown in FIG. 4 is an assembled sectional view of the vibration insulating bush for vehicle suspension of FIG.

Vibration insulation bush for vehicle suspension of the present invention has a core member 10 having a multi-stage coil structure and a vibration insulator 20 using a magnetorheological elastic body (MRE), as shown in FIG. 10, the coil 11 is wound around at least two places along the circumferential surface, and a vibration insulator 20 formed using a magnetorheological elastic body (MRE) is attached to the circumferential surface of the core member 10 ( 3). The combination of the core member 10 and the vibration insulator 20 coupled as described above may be provided in a state accommodated in the housing 30 having a predetermined shape.

The vibration insulator 20 is provided as a pair of corresponding structures to surround the surface of the core member 10, and the vibration insulator 20 may be formed by a casting method using a mold. Each portion 21, 22 of the vibration insulator 20 is formed in a concave surface 23 of constant curvature so that the inner surface of the vibrating insulator 20 is in close contact with the inner wall of the vibration insulator so that it can be safely maintained against vertical fluctuations. ) May have a structure protruding to the outside, the inner wall surface 24 of each of the portions (21) (22) is provided in a substantially flat structure to be in close contact with the surface of the core member (10). In addition, the connecting portions of the respective parts 21 and 22 constituting the vibration insulator 20 may be fixed by the stopper 40 having a predetermined shape so that it can be safely held on the inner wall of the housing against the left and right swing. .

As shown in FIG. 2, the housing 30 may be formed of a metal material having a cylindrical shape open up and down, and both sides of the inner wall may have convex surfaces 31 corresponding to the concave surfaces 23 of the vibration insulator 20. It is formed in the direction perpendicular to these convex surface is formed with a seating groove (32) into which a part of the stopper (40) is inserted. The stopper 40 has a predetermined elastic material and is configured to absorb vibration and large displacement transmitted from the upper end to the lower end of the housing 30 to the vehicle suspension.

In addition, the stopper 40 connects the upper and lower mounting portions 41 and 42 and the corresponding ends of the inner circumferences of the upper and lower mounting portions formed so as to span the upper and lower ends of the housing 30. Extension portion 43 is inserted into the seating groove 32 of the (30).

In this way, the vibration insulating bush for the vehicle suspension has a concave surface 23 of the vibration insulator 20 after the combination of the core member 10 and the vibration insulator 20 shown in FIG. 3 is inserted into the housing 30. The convex surface 31 of the housing 30 is in close contact with the upper and lower swings, and the extension part 43 of the stopper 40 and the seating groove 32 of the housing 30 are held in a locked state, and the left and right swings are kept. Is prevented.

FIG. 5 illustrates a manufacturing process of the vibration insulation bush for the vehicle suspension of FIG. 1. First, the vibration insulator 20 shown in FIG. 2 is formed through thermoforming of a magnetorheological elastic body (MRE) using a mold in FIG. 5A. . Then, as shown in FIG. 5B, the coil 11 is wound around at least two or three places of the core member 10 of FIG. 2 to form a multi-stage coil structure, and then the surface of the core member 10 is tape 12 or the like. Wind up and fix the coil. Next, the vibration insulator 20 is attached to the surface of the core member 10 to form an assembly as shown in FIG. 5C, and at the same time, the stopper 40 is coupled along the inner wall of the housing 30 as shown in FIG. 5D. . At this time, the stopper 40 is the upper and lower ends of the stopper 40 in a state in which the extension portion 43 (see FIG. 2) is inserted into the seating groove 32 (see FIG. 2) formed on the inner wall surface of the housing 30. The state of being mounted on the upper and lower ends of the 30 is maintained. Subsequently, as shown in FIG. 5E, at least an upper portion of the at least upper portion of the combination is inserted in a state in which the combination of the core member 10 and the vibration insulator 20 is inserted into the housing 30 and the end of the coil 11 is drawn out. 13) Cover and fasten to final assembly.

While various embodiments of the present invention have been described above, the contents described so far are merely illustrative of some of the preferred embodiments of the present invention, except as may be indicated in the appended claims below. It is not limited by the above description. Accordingly, the present invention is understood that many changes, modifications and substitutions of equivalents may be made by those skilled in the same art without departing from the spirit and scope of the invention within the scope of the following claims. Should.

1: vibration isolation bush
10: core member
11: coil
20: vibration insulator
21,22: each part of the vibration insulator
23: concave
24: inner wall
25: top, bottom
30: housing
31: convex surface
32: settling groove
40: stopper
41,42: holder
43: extension part

Claims (5)

Vibration insulation bush installed in the suspension module of the vehicle chassis,
Switching in the operator operating mode, comprising a core member wound at least two places on the wire coil, a vibration insulator made of a magnetorheological elastic body surrounding the surface of the core member, and a housing for protecting the combination of the core member and the vibration insulator When the magnetic field is not applied to maintain the vibration insulation performance, when applying the magnetic field is configured to improve the steering stability of the vehicle through the stiffness change of the magnetic rheological elastic body according to the strength of the magnetic field, the vibration insulator is the core A pair of corresponding structures to surround the surface of the member, each portion of the vibration insulator being in close contact with the inner wall of the housing and formed with a concave surface of constant curvature so as to remain secure against vertical swings , The lower end has a structure protruding to the outside, the inside of the respective parts Surface vibration insulating bush for a vehicle suspension, characterized in that it has a flat structure adapted to come into close contact with a surface of the core member. delete The method of claim 1,
And a stopper for absorbing vibration or large displacement transmitted to the chassis or suspension of the vehicle, wherein the stopper is made of a predetermined elastic material and surrounds at least the top or bottom of the combination of the core member and the vibration insulator and the top of the housing. Vibration insulation bush for vehicle suspension, characterized in that it extends from the bottom to the bottom. The method of claim 3, wherein
The housing is a cylindrical metal material which is opened up and down, and both sides of the inner wall are formed with a convex surface in close contact with the concave surface of the vibration insulator, and a seating groove into which a part of the stopper is inserted is formed in a direction perpendicular to the convex surface. Vibration insulation bush for vehicle suspension, characterized in that. The method of claim 4, wherein
The connecting portion of each part constituting the vibration insulator is fixed to be securely held on the inner wall of the housing against the left and right swing by the stopper, the stopper is formed so as to hang along the top and bottom of the housing And an extension part which connects a corresponding part of the inner circumference of the upper and lower mounting parts and is inserted into a seating groove of the housing.

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