KR19980085404A - Car shock absorber structure - Google Patents

Abstract

The present invention relates to a shock absorber structure for an automobile, wherein a piston (2) connected to a vehicle body is coupled to an inside of a cylinder (1) connected to an axle of an automobile, and the head portion (2a) of the piston (2) is coupled thereto. The electromagnet 4 wound around the coil 3 is integrally installed, and the MR fluid 5 in which the particle arrangement is changed by the magnetic field of the electromagnet 4 is enclosed inside the cylinder 1, while the MR fluid 5 is sealed. A plurality of orifices 6 are formed in the piston head portion 2a so that 5 can pass therethrough, and the outer shape of the piston head portion 2a becomes a plurality of constant irregularities, so that the cylinder 1 A plurality of spaces are formed by the inner wall part and the protrusion part 2b of the piston head part 2a, and a diaphragm 7 is installed at the lower part of the cylinder 1 to elastically support the upper MR fluid 5. Structure, the damping force can be properly adjusted by MR fluid as needed. By facilitating the various vibrations such as a high-frequency or low-frequency generated from a road surface vibration isolation which can be increased than the riding comfort of the car.

Description

Car shock absorber structure

The present invention relates to a shock absorber installed in a suspension of an automobile, in particular,

The present invention relates to an automobile shock absorber structure in which a fluid inserted into an absorber is replaced with an MR fluid (Magneto Rheological Fluid) to effectively dampen various types of vibrations generated in a vehicle body.

In general, shock absorbers are devices installed to improve ride comfort by absorbing natural vibrations generated by shocks received by springs when the vehicle is running, thereby quickly damping vibrations.

In addition, the shock absorber has a function of converting the up and down kinetic energy into heat, and there are solid friction type and hydraulic type, and hydraulic type is generally used.

Here, in the conventional structure of the hydraulic shock absorber, as shown in Figures 2 and 3, the elongated cylinders 11, which are compressible and stretchable in the up and down directions, are fitted to each other, and the inside of the cylinder 11 is coupled. Is coupled to the cylinder 12 connected to the axle and the piston 13 is connected to the vehicle body, the piston 13 has a plurality of orifices 14 to allow the oil filled in the cylinder 12 to pass through It is formed, the orifice 14 is provided with an automatic valve 15 for automatically opening and closing the orifice 14 in accordance with the flow of oil.

That is, when the cylinder 11 of the shock absorber is extended by external vibration, a damping action is suppressed by the resistance of oil passing through the orifice 14 of the piston 13, and the cylinder ( When 11) is compressed, the automatic valve 15 installed in the piston 13 is opened to allow oil to pass through without resistance, thereby preventing vibration.

Here, the conventional shock absorber having the above structure has little resistance during compression, so that the impact of the road surface is not transmitted to the vehicle body, so that the riding comfort on a bad road is improved.

However, since the shock absorber is designed to suppress external vibration only under predetermined conditions in the cylinder 12, it is not possible to simultaneously control low frequency vibration or high frequency vibration, but according to the setting process. Since only one low frequency or high frequency can be controlled, it is difficult to effectively suppress the vibration of various vibrations.

In other words, damping force should be increased when low frequency vibration with large displacement occurs, and damping force should be reduced when high frequency vibration with small displacement is generated. There is a problem that it is difficult to expect the effect.

Accordingly, the present invention has been made to solve the above problems, and replace the fluid encapsulated in the cylinder inside the shock absorber with MR fluid in which the arrangement of particles is changed by the magnetic field to effectively damp the vibrations. It is an object of the present invention to provide a shock absorber structure for automobiles.

The present invention for achieving the above object, the piston is formed in a cylindrical shape is connected to the inside of the cylinder connected to the axle side is connected to the vehicle body, the head of the piston is an electromagnet wound around the coil drawn out from the outside It is installed integrally, inside the cylinder is filled with MR fluid in which the particle arrangement is changed by the magnetic field of the electromagnet, while a plurality of orifices are formed in the head portion of the piston to allow the MR fluid filled in the cylinder to pass through It is installed in the lower portion of the cylinder structure consisting of a diaphragm to elastically support the MR fluid.

Here, the outer shape of the piston head portion in contact with the inner wall portion of the cylinder is formed into a plurality of constant irregularities, so that the MR fluid damping force in the plurality of spaces formed by the inner wall portion of the cylinder and the protrusion of the piston head portion It is characterized by having.

Therefore, when the driver feels that the vibration caused by the road surface is severely transmitted to the vehicle body, when the electric current is supplied to the cylinder of the shock absorber, the magnetic field is formed by the electromagnet so that the MR fluid particles in the cylinder are arranged in the vertical direction. Viscosity is increased so that the shock absorber has a large damping force.

Therefore, as described above, the damping force can be appropriately adjusted by the MR fluid as necessary, thereby effectively eliminating various vibrations such as high frequency or low frequency generated from the road surface to increase the vehicle riding comfort.

Figure 1a is a schematic diagram schematically showing the internal structure of the shock absorber according to the present invention,

1B is a cross-sectional view taken along the line A-A of FIG. 1A;

Figure 1c is a state diagram schematically showing the particle change of the MR fluid,

Figure 2 is a partially cutaway perspective view showing the structure of a shock absorber according to the prior art,

Figure 3 is a schematic diagram showing the operating principle of the shock absorber.

Explanation of symbols on the main parts of the drawings

1: cylinder 2: piston

2a: piston head 2b: protrusion

3: coil 4: electromagnet

5: MR fluid 6: Orifice

7: diaphragm

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Figure 1a is a schematic diagram showing the internal structure of the shock absorber according to the present invention, Figure 1b is a cross-sectional view taken along the line AA of Figure 1a, the vehicle body inside the cylinder (1) connected to the axle side of the vehicle The piston 2 connected to the side is coupled, an electromagnet 4 wound around the coil 3 is integrally installed in the head portion 2a of the piston 2, and an electromagnet ( While the MR fluid 5 whose particle arrangement is changed by the magnetic field of 4) is encapsulated, a plurality of orifices 6 are formed in the piston head 2a to allow the MR fluid 5 to pass therethrough. The outer shape of the piston head portion 2a becomes a plurality of constant irregularities to form a plurality of spaces by the inner wall portion of the cylinder 1 and the protrusion portion 2b of the piston head portion 2a. In the lower part of 1), the diaphragm 7 for elastically supporting the upper MR fluid 5 is installed. Structure.

In this case, the shock absorber having the structure as described above generates a magnetic field by flowing a current to the coil 3 surrounding the electromagnet 4 by an external power source when low frequency vibration is generated in the vehicle body and a large damping force is required. The magnetic field is changed by the magnetic field so that the viscosity of the fluid is increased and the damping force can be increased.

In addition, when high frequency vibration is generated in the vehicle body, the current of the coil 3 is cut off to reduce the damping force, and other vibrations can be actively controlled by inputting an appropriate control algorithm to the shock absorber.

In the structure of the piston head portion 2a, the electromagnet 4 in the form of a radiation is provided from the center to the outside, and the coil 3 drawn out from the outside is wound around the electromagnet 4, and the cylinder 1 The outer shape of the piston head portion 2a which is in contact with the inner wall portion of the c) is formed into a plurality of constant irregularities, and the inner wall portion of the cylinder 1 and the protrusion portion 2b of the piston head portion 2a are formed. The MR fluid 5 whose viscosity is increased by a magnetic field in a plurality of spaces has a large damping force.

In other words, the space formed by the piston head 2a and the inner wall of the cylinder 1 serves as the orifice 6, so that the MR fluid 5 having increased viscosity in the space receives shear force. It is to increase the damping force.

On the other hand, the increase in viscosity due to the particle arrangement of the MR fluid 5, as shown in Figure 1c, the microparticle fluid particles having a polarity around the electromagnet (4) generating a magnetic field is the particle arrangement is By being upright, the viscosity in the vertical direction is increased to increase the vertical damping force, which is a result of the change of the yield stress between the particles due to the action of the magnetic field.

Accordingly, the shock absorber using the MR fluid 5 increases the effect of the suspension system as a whole, and it is possible to appropriately control the vibration from the road surface according to various displacements. It can reduce wear.

As described above, according to the shock absorber structure for automobiles according to the present invention, the damping force can be appropriately adjusted by the MR fluid as necessary, so that various vibrations such as high frequency or low frequency generated from the road surface are easily damped. The effect is to increase the ride comfort.

Claims (2)

A piston (2) coupled to the vehicle body is coupled to the inside of the cylinder (1) formed in a cylindrical shape and connected to the axle, and the head portion (2a) of the piston (2) is wound around the coil (3) drawn from the outside. The electromagnet 4 is integrally installed, and the MR fluid 5 in which the particle arrangement is changed by the magnetic field of the electromagnet 4 is enclosed in the cylinder 1, while the MR fluid filled in the cylinder 1 is filled. A plurality of orifices 6 are formed in the piston head 2a so that 5 can pass therethrough, and a diaphragm 7 elastically supporting the upper MR fluid 5 at the lower portion of the cylinder 1. Built-in shock absorber structure for automobiles. 2. The inner wall portion of the cylinder 1 and the piston head portion according to claim 1, wherein the outer shape of the piston head portion 2a in contact with the inner wall portion of the cylinder 1 is formed into a plurality of constant irregularities. A shock absorber structure for automobiles, characterized in that the MR fluid (5) has a damping force in a plurality of spaces formed by the protrusions (2b) of (2a).