KR20030033878A - Shock absorber of vehicle - Google Patents

Abstract

PURPOSE: A shock absorber for a vehicle is provided to secure driving safety in cornering by increasing height of the shock absorber of an outer wheel with a height adjusting apparatus. CONSTITUTION: A shock absorber for a vehicle includes a pressure generating layer(C) and a height adjusting apparatus. The pressure generating layer is formed in a cylinder(11) airtightly apart from an oil layer(A) and a gas layer(B). The height adjusting apparatus increases pressure of the pressure generating layer forcibly. Therein, a piston rod(13) is extended. The height adjusting apparatus comprises a steering angle sensor(21); a height sensor(22); an ECU(Electronic Control Unit,23) and a nitrogen gas compressing device(30). The height sensor is installed to right and left sides of a vehicle. The ECU decides the vehicle is turning by analyzing signals of the steering angle sensor and the height sensor. The nitrogen gas compressing device is driven by a control signal of the ECU. Therein, the nitrogen gas layer of the cylinder is compressed toward an upper direction of the cylinder. Therefore, height of the vehicle is adjusted by extension of the shock absorber.

Description

Shock absorber of vehicle

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to shock absorbers of automobiles, and more particularly, to shock absorbers of automobiles which are capable of securing driving stability by increasing the height of the shock absorbers located on the outer ring side from the turning center when turning.

In general, the suspension system is an important device for promoting the ride comfort and driving stability of the vehicle, and the main components thereof include a spring for absorbing the shock during the bump / rebound of the wheel, and the impact as described above. There is a shock absorber that absorbs the vibration and quickly attenuates the vibration of the spring, and maintains a constant garage. There is a strut method that connects these springs and the shock absorber to the knuckles, and installs them in different positions. There are many different types of suspensions, including the way.

The shock absorber may be of various types, but when looking at the basic structure of the gas-filled shock absorber as shown in Figure 1, the cylinder 11 is connected to the suspension of the wheel, and is connected to the vehicle body side is transmitted from the vehicle body A piston 12 and a piston rod 13 which linearly reciprocate up and down in the cylinder 11 according to a load, and a reciprocating linear movement up and down in the cylinder 11 at a lower end of the piston 12. The free piston 14, the oil 15 filled in the oil layer A between the piston 12 and the free piston 14, and the gas layer between the free piston 14 and the cylinder 11. Nitrogen gas 16 or the like filled in (B).

Here, the piston 12 is formed with a plurality of orifices (11a), the orifice (17a) is provided with a leaf spring (17b), respectively, the orifice (17a) and the leaf spring (17b) by integrating the piston The valve 17 is called.

When the shock absorber configured as described above is compressed (BUMP), as the piston rod 13 moves to the lower side of the cylinder 11, the piston valve 17 opens upward, and the piston 12 and the free piston 14 Oil 15 filled in the oil layer (A) is moved to the upper space of the piston 12, the free piston 14 as the piston 12 is lowered by the flow resistance of the oil (15) It is also pushed down, which causes the nitrogen gas 16 to be compressed to generate a damping force.

When the compression operation of the shock absorber is stopped, the nitrogen gas 16 in the lower portion of the free piston 14 expands. When the nitrogen gas 16 expands in this way, the piston 12 frees up. The oil 15 filled between the pistons 14 is pressurized by the pressure of the nitrogen gas 16.

On the other hand, during expansion of the shock absorber (REBOUND), as the piston rod 13 moves upward of the cylinder 11, the piston valve 17 opens thereafter and moves to the upper space of the piston 12 (15). ) Is moved back to the oil layer (A) between the piston 12 and the free piston (14), the pressure of the oil layer (A) is lowered, so the free piston 14 is returned to its original position Come.

However, the conventional shock absorber as described above is designed to keep the garage constant while compressing or extending (BUMP / REBOUND) only when there is a change in the load input to the vehicle body, and there is no change in the load input to the vehicle body. There is a problem that the driving stability is deteriorated when the vehicle is turning because it is not allowed to adjust the garage when the vehicle is turning.

That is, as shown in FIG. 2A, when the traveling vehicle turns along the road D, a centrifugal force acts on the turning center C based on the turning center C, and the road of an exclusive road or highway (D) is inclined at a certain angle with respect to the turning center (C) as shown in Figure 2b to give some stability to the centrifugal force of the vehicle, but the inclination angle of the road alone does not satisfactorily satisfy the stability of the driving during turning In addition, most roads (D) of national roads or downtown roads have no inclination angle, as shown in FIG. 2C, so that the running stability of the turning vehicle is worse than that of roads of motor vehicles or highways (D). It became a factor.

As described above, in order to provide driving stability to a vehicle that is turning, it is necessary to raise the height of the outer ring side to a certain height based on the turning center (C). However, the conventional shock absorber cannot adjust the height of the driving state of the vehicle. There was a problem that the running stability worsens when turning.

Accordingly, the present invention has been made to solve the above problems, by installing a height adjusting device to the shock absorbers mounted on each wheel to increase the height of the shock absorber located on the outer ring side from the turning center when turning the outer ring side The purpose of this invention is to provide a shock absorber of a vehicle that can control the height of the vehicle so as to secure driving stability when the vehicle is turning.

The shock absorber of the present invention for achieving the above object, the pressure generating layer is formed to be separated to maintain the airtight with the oil layer and gas layer formed in the cylinder stacked type, and the outer ring based on the turning center of the road when turning It is characterized in that it comprises a height adjusting device for forcibly increasing the pressure of the pressure generating layer positioned in the to give running stability while extending the length of the piston rod.

1 is a longitudinal sectional view of a shock absorber generally used;

2 is a schematic state diagram for explaining a driving state of a vehicle;

3 is a schematic diagram illustrating a shock absorber according to the present invention.

<Description of Symbols for Main Parts of Drawings>

11-Cylinder 16-Nitrogen Gas

21-Steering Angle Sensor 22-Garage Sensors

23-Electronic control unit (ECU) 30-Nitrogen gas pressurizing means

31-Pressure plate member 31a-Sealing member

32-Pressure generating pump 33-Pressure generating material

34-Storage Tank 35-Supply Pipe

36-Return Pipe 37-Electronic Control Valve

B-gas layer C-pressure generating layer

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

Figure 3 is a schematic configuration diagram for explaining the shock absorber according to the present invention, will be described with the same reference numerals to the same parts as the conventional structure.

The shock absorber according to the present invention has a structure configured to perform a role of forcibly adjusting the height of the piston rod according to the driving state of the vehicle to improve driving stability when turning.

That is, the gas-sealed shock absorber generally used is a cylinder 11 connected to the suspension of the wheel, and the cylinder 11 is connected to the vehicle body side and the load is transmitted from the vehicle body as shown in FIG. 3. Piston 12 and the piston rod 13 for linear reciprocating movement up and down in the interior, and free piston 14 for linear reciprocating movement up and down in the cylinder 11 is located at the lower end of the piston 12 and , Nitrogen gas filled in the oil (15) filled in the oil layer (A) between the piston 12 and the free piston 14, and the gas layer (B) between the free piston 14 and the cylinder (11) (16) and the like.

Here, the piston 12 is formed with a plurality of orifices (11a), the orifice (17a) is provided with a leaf spring (17b), respectively, the orifice (17a) and the leaf spring (17b) by integrating the piston The valve 17 is called.

On the other hand, the shock absorber according to the present invention, as shown in Figure 3, the pressure generating layer formed to be separated to maintain the airtight and the oil layer (A) and the gas layer (B) formed in the cylinder 11 laminated ( C), and height adjustment to increase the length of the piston rod 13 by forcibly increasing the pressure of the pressure generating layer (C) located in the outer ring on the basis of the turning center of the road at the time of turning to give a running stability It will be configured to include the device.

Here, the height adjustment device is a steering angle sensor 21 for detecting the steering angle of the steering wheel, the height sensor 22 mounted on the left and right sides of the vehicle body for detecting the attitude of the vehicle being driven, the steering angle sensor 21 and The electronic control unit 23 (ECU) which analyzes the signal transmitted from the garage sensor 22 and determines that the vehicle is in a turning driving state, is driven according to the control signal of the electronic control unit 23, and the cylinder is driven by this driving force. The gas layer B of the nitrogen gas 16 filled in 11) is compressed to the upper direction of the cylinder 11, so as to expand the shock absorber and to adjust the height of the gas.

In addition, the nitrogen gas pressurizing means 30 has an outer circumferential surface wrapped by a sealing member 31a so that the pressure generating layer C is formed below the gas layer B, so that the gas layer B is inside the cylinder 11. And the pressurizing plate member 31 installed to linearly reciprocate the cylinder 11 according to the pressure change of the gas layer B and the pressure generating layer C, and the electronic control unit 23. A storage tank for storing a pressure generating pump 32 selectively driven according to a control signal of the pressure generating material 32 and a pressure generating material 33 supplied to the pressure generating layer C according to the driving of the pressure generating pump 32; 34 and the storage tank 34 in accordance with the operation of the pressure generating pump 32 while being connected to the pressure generating layer (C) to maintain the airtight via the storage tank 34 and the pressure generating pump 32 in sequence. Supply pipe 35 for supplying the pressure generating material (33) stored in the pressure generating layer (C), Group comprises a gas layer (B) and the pressure-generating layer (C), the return pipe 36 to return the pressure generation layer (C) the pressure generated by material supply 33 according to the change in pressure to the storage tank 34 of the.

In addition, the supply pipe 35 and the return pipe 36 is provided with an electronic control valve 37 which is selectively opened and closed by the control signal of the electronic control unit 23, the electronic control valve 37 When the pressure generating material 33 is supplied from the storage tank 34 to the pressure generating layer C, the return pipe 36 is sealed while opening the supply pipe 35 and stored in the pressure generating layer C. When the pressure generating material 33 is discharged to the tank 34, the supply pipe 35 is closed while the return pipe 36 is opened.

On the other hand, the pressure generating material 33 may be oil (oil) or nitrogen gas (N ₂ ), and in addition to increasing the volume of the pressure generating layer (C) when supplied to the pressure generating layer (C) All materials that can move the pressure plate member 31 to the upper side of the cylinder 11 may be used.

Therefore, when the driver rotates the steering wheel clockwise or counterclockwise to turn the vehicle driving along a road having a constant radius of curvature, the electronic control unit 23 mounted on the vehicle detects the steering angle of the steering wheel. The steering angle sensor 21 and the left and right sides of the vehicle body are analyzed to determine whether the vehicle is turning by analyzing signals transmitted from the garage sensor 22 that detects the attitude of the vehicle being driven.

At this time, when it is determined that the vehicle being driven by the electronic control unit 23 in the turning driving state, the electronic control unit 23 is the pressure generating pump 32 of the front and rear sides located on the outer ring side with respect to the turning center of the road. The pressure generating material 33 stored in the storage tank 34 is driven by the driving force of the pressure generating pump 32. ) Is supplied to the pressure generating layer (C) in the cylinder (11).

When the pressure generating material 33 is supplied to the pressure generating layer C and the pressure of the pressure generating layer C is gradually raised, the pressure plate partitioning the gas layer B and the pressure generating layer C is provided. The member 31 is moved upwards of the cylinder 11 by the rising pressure of the pressure generating layer C, so that the nitrogen gas 16 filled in the gas layer B rises of the pressure plate member 31. Compressed by the travel distance.

In addition, when the nitrogen gas 16 is compressed by the upward movement distance of the pressure plate member 31, the free piston 16 is also moved to the upper side of the cylinder 11 by the compression force of the nitrogen gas 16, Due to this, the oil 15 filled in the oil layer A is also compressed by the upward movement distance of the free piston 14.

When the oil 15 is compressed by the moving distance of the free piston 14, the piston 12 and the piston rod 13 are also moved upward of the cylinder 11 by the compression force of the oil 15. Therefore, the garage of the vehicle body located on the outer ring side of the turning center of the road is increased by the length of the elongated shock absorber.

At this time, the height of the height of the garage is determined by the electronic control unit 23 that controls the driving of the pressure generating pump 32 of the nitrogen gas pressurizing means 30, the electronic control unit 23 detects the attitude of the vehicle To control the driving of the pressure generating pump 32 by comprehensively analyzing the value input from the garage sensor 22 or from various types of sensors such as a sensor for detecting a slope of a road and other vehicle speed sensors. Done.

As described above, when the vehicle height of the vehicle body located on the outer ring side of the vehicle in the turning direction is raised to a certain height by the height adjusting device of the shock absorber according to the present invention, the centrifugal force is applied to the turning vehicle. Even if it acts, it is possible to give sufficient stability to the centrifugal force of the vehicle, thereby improving the driving stability of the vehicle in the turning driving.

On the other hand, in the series of operation process as described above, if it is determined that the vehicle being driven is turning by the electronic control unit 23, the initial operation is made quickly, and the operation of raising the garage while turning is performed for stability of driving. It will be done slowly with a certain time.

Then, when the running vehicle ends the turning drive, the electronic control unit 23 analyzes the signals transmitted from the steering angle sensor 21 and the garage sensor 22 to control the driving of the pressure generating pump 32. Thus, the pressure plate member 31 of the nitrogen gas pressurizing means 30, which has been moved to the upper side of the cylinder 11, is returned to the lower side of the cylinder 11, which is the original position, and thus the pressure generating layer C The pressure generating material 33 which has been supplied to is also returned to the storage tank 34 via the return pipe 36 and the electronic control valve 37 in sequence.

Then, when a predetermined amount of the pressure generating material 33 supplied to the pressure generating layer C is returned to the storage tank 34, the shock absorber of the outer ring that is extended during the turning driving is contracted back to a length suitable for the straight driving. Accordingly, while the garage of the vehicle body is also maintained in an equilibrium state, driving stability due to straight driving is given.

As described above, according to the present invention, the height of the vehicle body located on the outer ring side based on the turning center of the road when the traveling vehicle starts turning is fixed by using the height adjusting device operated by the control of the electronic control unit. By being raised to the height, even if the centrifugal force is applied to the turning vehicle, the turning vehicle can have sufficient stability against the centrifugal force, thereby improving driving stability and preventing safety accidents in advance.

Claims (5)

The pressure generating layer (C) formed to be separated from the oil layer (A) and the gas layer (B) formed in the cylinder 11 to be kept in airtightness, and positioned on the outer ring based on the turning center of the road when turning Shock absorber of the vehicle comprising a height adjusting device for forcibly increasing the pressure of the pressure generating layer (C) to impart running stability while extending the length of the piston rod (13). According to claim 1, wherein the height adjustment device is a steering angle sensor 21 for detecting the steering angle of the steering wheel, a height sensor 22 mounted on the left and right sides of the vehicle body for detecting the attitude of the vehicle being driven, and the steering angle sensor An electronic control unit 23 (ECU) for analyzing the signal transmitted from the vehicle 21 and the garage sensor 22 to determine that the vehicle is in a turning driving state, and driven according to the control signal of the electronic control unit 23, and the driving force Compressed gas layer (B) of the nitrogen gas 16 filled in the cylinder 11 by the upward direction of the cylinder 11 is composed of nitrogen gas pressurizing means 30 to adjust the height while extending the shock absorber Shock absorber of car. According to claim 2, wherein the nitrogen gas pressurizing means 30 is surrounded by a sealing member (31a) so that the pressure generating layer (C) is formed in the lower portion of the gas layer (B) is a gas layer inside the cylinder (11) Pressure plate member 31 which is installed to maintain the air tightness (B) and is installed to linearly reciprocate the cylinder 11 in accordance with the pressure change of the gas layer (B) and the pressure generating layer (C), and the electronic control unit A pressure generating pump 32 selectively driven in accordance with the control signal of 23, and a pressure generating material 33 supplied to the pressure generating layer C according to the driving of the pressure generating pump 32; The storage tank 34 and the storage tank 34 and the pressure generating pump 32 are sequentially connected to the pressure generating layer C while maintaining the airtightness and are stored according to the driving of the pressure generating pump 32. Supply pipe 35 for supplying the pressure generating material 33 stored in the tank 34 to the pressure generating layer (C) And a return pipe 36 for returning the pressure generating material 33 supplied to the pressure generating layer C to the storage tank 34 according to the pressure change of the gas layer B and the pressure generating layer C. Shock absorber of a car, characterized in that the. According to claim 3, The supply pipe 35 and the return pipe 36 is provided with an electronic control valve 37 which is selectively opened and closed by the control signal of the electronic control unit 23, the electronic control valve When the pressure generating material 33 is supplied from the storage tank 34 to the pressure generating layer C, the return pipe 36 is sealed while the supply pipe 35 is opened, and the pressure generating layer ( And (c) when the pressure generating material (33) is discharged to the storage tank (34), the shock absorber of the vehicle, characterized in that it is operated to open the return pipe (36) while closing the supply pipe (35). The shock absorber according to claim 3 or 4, wherein the pressure generating material (33) is oil or nitrogen gas.