KR20020045826A - Shock absorber for automobiles - Google Patents

Abstract

PURPOSE: A shock absorber of a vehicle is provided to improve fuel efficiency as decreasing weight of a vehicle by changing damping effect according to weight of a vehicle or driving condition, and to perform maintenance and repair easily as having simple structure. CONSTITUTION: A shock absorber of a vehicle consists of a cylinder(100) having a closed part(110) with a first connecting ring(510) in one side and an opening(120) in the other side, and increasing as the inside goes to the opening; incompressible fluid(200a) filled in the inner part of the cylinder; a first piston(310) formed to be movable inside of the cylinder and decompressing the incompressible fluid; a second piston(320) formed to be movable inside of the cylinder to decompress the incompressible fluid as filling a separate compressible fluid in the closed part; a piston rod(400) having the first piston in one side and a second connecting ring(520), and penetrating the opening. The inside of the cylinder of the shock absorber in a suspension system of a vehicle is changed, so damping effect is changed. A special control apparatus is not necessary and fuel efficiency is improved by decreasing weight of a vehicle.

Description

Shock absorber for automobiles

The present invention relates to a shock absorber of a vehicle, and in particular, by varying the cylinder inner diameter of the shock absorber provided in the suspension of the vehicle in the longitudinal direction, the damping effect according to the weight or driving conditions of the vehicle without the need for a separate adjustment means As a device for changing, it is possible to improve fuel economy by reducing the weight of the vehicle because no separate adjusting means is required, and the structure is simple, and relates to a device that can easily perform maintenance and repair.

In general, the shock absorber of the vehicle is included in the suspension of the vehicle, and the suspension system connects the axle to the vehicle body so that the vibration or shock received from the road surface is not directly transmitted to the vehicle body when driving. It is a device that prevents damage and improves the ride comfort.It is a chassis spring that alleviates the shock on the road, a shock absorber that suppresses the free vibration of the chassis spring, and a stabilizer that prevents the vehicle from shaking sideways. Consists of.

The suspension system delivers the driving force generated on the driving wheels and the braking force of each wheel to the body while braking, and also withstands the centrifugal force when turning, and supports each wheel in the correct position with respect to the body. In order to alleviate the impact on the road surface, the suspension system needs to be coupled in a state capable of moving up and down, and a strong coupling in the horizontal direction is required to withstand the driving force, braking force and centrifugal force generated when turning. .

As described above, the suspension system is a key component that determines the ride comfort and performance of the vehicle, and has been considered as the most important item in the design of the vehicle until recently because it has a great influence on the space used by the passengers according to the shape and structure.

1 is a diagram showing a shock absorber of a conventional automobile.

As shown in FIG. 1, a shock absorber of a conventional automobile includes a cylinder 11 having a sealing portion 11 formed at one side thereof, and a first connecting ring 51 at the side end thereof, and having an opening 12 at the other side thereof. 10); An incompressible fluid (20a) filled in the cylinder (10); It is formed so as to be able to flow in the longitudinal direction inside the cylinder 10, the incompressible fluid (20a) is formed so as to pass only in one direction, respectively in the upper direction and the lower direction (33) and the lower direction control ( A first piston 31 having 34); A second piston (32) formed to fill the sealing part (11) with a separate compressive fluid (20b) and to be able to flow in the longitudinal direction inside the cylinder (10); The first piston 31 is formed on one side and the second connecting ring 52 is provided on the other side, and is composed of a piston rod 40 penetrating the opening 12.

In the shock absorber of the conventional vehicle configured as described above, the first connecting ring 51 is fastened to the vehicle body, and the second connecting ring 52 is fastened to the axle so that the impact is transmitted to the axle. Piston rod 40 connected to the () is moved upwards and the first piston 31 to apply pressure to the incompressible fluid 20a filled above the first piston 31 in the cylinder (10).

In addition, the incompressible fluid 20a filled in the upper side of the cylinder 10 may use oil, etc. The incompressible fluid 20a receives the pressure in the cylinder 10 and receives the cylinder through the downward adjustment mechanism 34. The first piston 31 in (10) is moved to the lower side, at this time, the incompressible fluid 20a is absorbed by the shock caused by the viscous friction generated while moving through the lower control mechanism (34).

On the contrary, when the piston rod 40 connected to the second connecting ring 52 moves downward to apply pressure to the incompressible fluid 20a filled under the cylinder 10, The incompressible fluid 20a filled in the lower portion of the first piston 31 in the cylinder 10 moves to the upper portion of the first piston 31 in the cylinder 10 through the upward adjustment device 33. The shock is absorbed by the viscous friction generated while the incompressible fluid 20a moves through the upward adjustment mechanism 33.

At this time, the upper direction control device 33 and the lower direction control device 34 is provided with an adjusting means so that the engine control unit (ECU) adjusts the opening amount of the adjusting means according to the driving conditions of the vehicle, thereby compressing fluid ( The damping rate is controlled by adjusting the flow rate of 20a).

In addition, the compressive fluid 20b filled in the seal 11 fills gas and is sealed with the second piston 32 so that the second piston 32 flows when the large shock is transmitted. The pressure is applied to or reduced from the compressive fluid 20b filled in the portion 11 to absorb the impact.

However, the shock absorber of the conventional vehicle additionally installs an adjustment sensor and an actuator for adjusting the opening amount in the engine control unit, thereby increasing the weight of the vehicle and reducing fuel economy, and thus the price of the adjustment means. Because of this high price, there was a problem that should be applied only to luxury cars.

The present invention is to solve the above problems, by changing the inner diameter of the shock absorber provided in the suspension of the vehicle in the longitudinal direction by varying the damping effect according to the weight or driving conditions of the vehicle requires a separate control means To reduce the weight of the vehicle to improve the fuel economy and to provide a shock absorber of the car that can be easily carried out maintenance and repair due to the simple structure.

The present invention is a cylinder formed on one side is provided with a first connecting ring at the side end, the other end is provided with an opening to gradually increase the inner diameter toward the opening; An incompressible fluid filled in the cylinder; A first piston formed in the cylinder to be movable in a longitudinal direction and provided to apply or depressurize the incompressible fluid; A second piston formed in the sealing part so as to be able to flow in the longitudinal direction inside the cylinder to fill and compress the separate compressive fluid; The first piston is formed on one side and the second connecting ring is provided on the other side to achieve the piston rod penetrating the opening.

1 is a diagram showing a shock absorber of a conventional automobile;

2 shows a shock absorber of a motor vehicle of the present invention;

3 shows another embodiment of a shock absorber of a motor vehicle of the invention.

<Explanation of symbols for the main parts of the drawings>

100: cylinder 110: sealing

120: opening 200a: incompressible fluid

200b: compressible fluid 310: first piston

320: second piston 400: piston rod

510: first connection ring 520: second connection ring

600: crevice

Fig. 2 is a diagram showing the shock absorber of the automobile of the present invention, and Fig. 3 is a diagram showing another embodiment of the shock absorber of the automobile of the present invention.

An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in Figure 2, the shock absorber of the automobile of the present invention is formed with a sealing portion 110 on one side is provided with a first connecting ring 510 on the side end, the other side is provided with an opening 120 A cylinder 100 formed to gradually increase an inner diameter toward the opening 120; An incompressible fluid (200a) filled in the cylinder (100); A first piston (310) formed to be movable in the longitudinal direction in the cylinder (100) and provided to apply or depressurize the incompressible fluid (200a); The second piston 320 is filled with a separate compressive fluid (200b) to the sealing portion 110 and provided to pressurize and decompress the compressive fluid (200b) to be able to flow in the longitudinal direction inside the cylinder (100) and ; A piston rod 400 formed at one side thereof and having a second connection ring 520 at the other side thereof to penetrate the opening 120; Technical features of the present invention include a gap 600 formed between the inner circumferential surface of the cylinder 100 and the outer circumferential surface of the first piston 310.

Hereinafter, the operation of the present invention will be described with reference to FIGS. 2 to 3.

As shown in Figure 2, the shock absorber of the vehicle of the present invention, the first connecting ring 510 is fastened to the vehicle body, the second connecting ring 520 is fastened to the axle when the shock is transmitted to the axle The piston rod 400 connected to the second connecting ring 520 moves upward, so that the first piston 310 is pressurized by the incompressible fluid 200a filled above the first piston 310 inside the cylinder 100. Will be added.

In addition, the incompressible fluid 200a filled in the cylinder 100 may use oil, etc. The incompressible fluid 200a may receive a pressure from the upper side of the first piston 310 inside the cylinder 100. It moves to the lower side of the first piston 310 in the cylinder 100 through the gap 600 formed between the inner circumferential surface of the 100 and the outer circumferential surface of the first piston 310, wherein the incompressible fluid 200a The shock is absorbed by the viscous friction generated while moving through the gap 600.

On the contrary, the piston rod 400 connected to the second connecting ring 520 moves downward so that the first piston 310 is filled below the first piston 310 in the cylinder 100. ), The incompressible fluid 200a filled in the lower portion of the first piston 310 in the cylinder 100 receives the pressure from the lower side of the cylinder 100, and passes through the gap portion 600 in the cylinder 100. The first piston 310 is moved upward, and at this time, the incompressible fluid 200a is absorbed by the viscous friction generated while moving through the gap 600.

Since the inner diameter of the cylinder 100 is formed to gradually increase toward the opening end 120, when the piston rod 400 connected to the second connecting ring 520 moves upward, the gap 600 ), The cross-sectional area is gradually reduced to increase the damping rate, and when the piston rod 400 connected to the second connecting ring 520 moves downward, the cross-sectional area of the gap 600 gradually widens to lower the damping rate. do.

In addition, as shown in Figure 3, the inner diameter of the cylinder 100 is formed to gradually decrease toward both sides, so that the cross-sectional area of the gap 600 is widest in the center of the cylinder 100 and gradually toward both sides When the shock transmitted to the shock absorber is small, the first piston 310 is positioned at the center of the cylinder 100 so that the cross-sectional area of the gap 600 is wider to lower the damping rate, which is transmitted to the shock absorber. When the impact is large, as the first piston 310 moves to both sides of the cylinder 100, the cross-sectional area of the gap 600 is reduced to increase the damping rate.

The compressible fluid 200b filled in the sealing part 110 fills gas and is sealed with the second piston 320 so that when the large shock is transmitted, the second piston 320 flows to the sealing part ( Pressure is applied to or reduced from the compressible fluid 200b filled in 110 to absorb the shock.

The shock absorber of the automobile formed as shown in FIG. 2 has a crevice 600 as the first piston 310 rises to the upper portion of the cylinder 100 as the weight of the vehicle increases due to a large number of passengers or a large load of cargo. As the cross-sectional area of) increases, the damping rate is increased, and as the weight of the vehicle decreases, the first piston 310 descends to the lower portion of the cylinder, and the cross-sectional area of the gap 600 becomes wider, thereby lowering the damping rate. Adjust the attenuation rate.

In addition, in the shock absorber of the automobile formed as shown in FIG. Increasing and decreasing the impact transmitted while driving the first piston 310 is located in the center of the cylinder 100 to lower the damping rate.

As described above, by changing the inner diameter of the cylinder 100 according to the intention of the designer, it is possible to easily control the damping rate for the shock transmitted to the shock absorber according to the weight of the vehicle and the driving conditions.

The present invention as described above by changing the inner diameter of the shock absorber provided in the suspension of the vehicle in the longitudinal direction by varying the damping effect according to the weight or driving conditions of the vehicle does not require a separate control means to increase the weight of the vehicle By reducing the fuel economy can be improved and the structure is simple, the invention can be easily carried out maintenance and repair.

Claims (2)

A cylinder formed at one side thereof with a first connecting ring at a side end thereof, and having an opening at the other side thereof, the cylinder being formed to gradually increase inward diameter toward the opening; An incompressible fluid filled in the cylinder; A first piston formed to be movable in the longitudinal direction in the cylinder and provided to pressurize and depress the incompressible fluid; A second piston formed in the sealing part so as to be able to flow in the longitudinal direction inside the cylinder to fill and compress the separate compressive fluid; The shock absorber of the vehicle, characterized in that the first piston is formed on one side and the second connecting ring is provided on the other side is composed of a piston rod passing through the opening. A cylinder formed at one side thereof, the first connecting ring being provided at a side end thereof, and having an opening at the other side thereof, the cylinder being formed to gradually reduce an inner diameter toward both sides; An incompressible fluid filled in the cylinder; A first piston formed to be movable in the longitudinal direction in the cylinder and provided to pressurize and depress the incompressible fluid; A second piston formed in the sealing part so as to be able to flow in the longitudinal direction inside the cylinder to fill and compress the separate compressive fluid; The shock absorber of the vehicle, characterized in that the first piston is formed on one side and the second connecting ring is provided on the other side is composed of a piston rod passing through the opening.