KR101416915B1 - Vehicle height adjusting device and car having the same - Google Patents

Abstract

The present invention relates to a ground clearance adjusting device for adjusting ground clearance of a vehicle by supplying a fluid to a suspension system cylinder or discharging the fluid therefrom. The ground clearance adjusting device includes: an adjusting device cylinder having a piston arranged to move and having both ends sealed such that a plurality of chambers can be formed by the piston; first and second pipes configured to connect the adjusting device cylinder with the suspension system cylinder; first and second flow control valves arranged on the first and second pipes, respectively; a floating unit provided to allow the flow of a fluid between the chambers of the adjusting device cylinder; and a valve unit configured to control the flow of the fluid in the floating unit so as to control the oil pressure of the suspension system cylinder using the movement of the piston and the flow of the fluid.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle height adjusting device,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a ground level adjusting device for adjusting a ground level of a vehicle by supplying or discharging a fluid to a suspension cylinder, and a vehicle having the ground level adjusting device.

Height regulators with pneumatic suspension with gas use additional air compressors or utilize hydraulic pressure to apply a higher pressure than the vehicle average gas pressure. Using this, the height adjustment device performs the height adjustment function of the suspension device of the vehicle. However, this structure had to bear the additional burden of increasing system complexity and weight.

In particular, in the case of a tactical vehicle, it is necessary to actively control the ground level of the vehicle at a suitable height according to the form of the ground and the performance condition of the vehicle so as to minimize the observation and the area of the prototype from the enemy.

Accordingly, the present invention overcomes the above-described problems and provides a new technique for easily adjusting the ground level of the vehicle according to the road surface state and the type of mission performance.

An object of the present invention is to provide a ground level control device capable of actively controlling the ground level of a vehicle according to the road surface state and the type of mission performance.

According to an aspect of the present invention, there is provided a ground level adjusting apparatus for adjusting a ground level of a vehicle by supplying or discharging fluid to a suspension cylinder according to an embodiment of the present invention, A first pipe and a second pipe connecting the control cylinder and the suspension cylinder to each other, and a second pipe connected to the first pipe and the second pipe, respectively, A first flow control valve and a second flow control valve; a flow section formed to allow flow of fluid between the plurality of chambers of the regulator cylinder; and a flow control section that controls the flow of the fluid, And a valve portion for controlling the flow of the fluid in the fluid portion so as to adjust the fluid pressure in the device cylinder.

According to one embodiment of the present invention, the regulating device cylinder is provided with a first chamber and a second chamber on both sides thereof with respect to the piston, and the valve is disposed in the piston and between the first chamber and the second chamber Lt; RTI ID = 0.0 > a < / RTI > flow of fluid in one direction.

The controller for controlling the driving of the ground control device may open the second flow control valve when the piston moves in a direction in which the volume of the second chamber decreases in the reference position to raise the ground clearance.

Wherein the controller controls the driving of the ground level adjusting device such that the ground level is lowered when the piston is restored to the reference position after moving in the direction of decreasing the volume of the first chamber at the reference position, A flow control valve is opened and the check valve is configured to allow fluid in the first chamber to flow into the second chamber.

The piston is a single piston which moves by the rotation of the screw, and the screw can be connected to the motor through a speed reducer.

According to another embodiment of the present invention, the piston has first and second pistons spaced apart from each other, and at a reference position in which the first piston is disposed at one end of the cylinder, Two chambers are formed.

Wherein the valve portion includes a first valve disposed in a first bypass pipe connecting the first chamber and the portion covered by the first piston at the reference position, And a second valve disposed in a second bypass pipe connecting the two piston-covered portions.

According to another aspect of the present invention, in order to raise the ground clearance, the control unit for controlling the driving of the ground clearance control apparatus may further include a control unit for controlling the operation of the ground clearance control unit, when the piston moves in a direction in which the volume of the second chamber decreases, And opens the valve and the second flow control valve.

Wherein the controller controls the driving of the ground level adjusting device to open the second valve and the first flow control valve when the piston moves in the direction of decreasing the volume of the second chamber at the reference position, can do.

According to the present invention having the above-described structure, the ground level of the vehicle can be automatically adjusted along the road surface, so that when the road surface is in good condition, the vehicle body is in a normal position, In soft ground, increase the ground clearance to protect the bottom of the vehicle and prevent it from touching the ground. Through this, it is possible to lower the ground clearance at a high speed on a good ground such as a pavement floor.

In addition, the present invention makes it possible to secure stability with high-speed driving of a vehicle without installing a pressure-increasing air compressor or a hydraulic system necessary for raising a garage, and in the case of a tactical vehicle, There is an advantage that it can be minimized.

1A and 1B are conceptual diagrams of a ground level adjusting apparatus according to the present invention.
FIG. 2A is a state diagram of a suspension cylinder and a ground level control device in a case where the ground level is in a steady state in a single cylinder structure. FIG.
Fig. 2b is a state diagram of the suspension cylinder and the ground level control device when the ground level is raised in a single cylinder structure. Fig.
Fig. 2c is a state diagram of the suspension cylinder and the ground level control device when restoring the ground state to a steady state in a single cylinder structure. Fig.
Figure 2d is a state diagram of the suspension cylinder and the ground level control system when lowering the ground clearance in a single cylinder structure.
FIG. 2E is a state diagram of the suspension cylinder and the ground level control apparatus when restoring the ground state to a steady state in a state of lowering the ground level in the single cylinder structure. FIG.
FIG. 3A is a state diagram of a suspension cylinder and a ground level adjusting device in a case where the ground level is in a steady state in a tandem cylinder structure. FIG.
Fig. 3b is a state diagram of the suspension cylinder and the ground level control device when the ground level is raised in a tandem cylinder structure. Fig.
Fig. 3c is a state diagram of the suspension cylinder and the ground level control device when restoring the tandem cylinder structure to a steady state in a state where the ground clearance is raised.
FIG. 3D is a state diagram of a suspension cylinder and a ground level control device when lowering the ground clearance in a tandem cylinder structure. FIG.
FIG. 3E is a state diagram of the suspension cylinder and the ground level control device when restoring the ground level to a steady state in a tandem cylinder structure. FIG.
4 is a conceptual diagram of a conventional ground-top control function.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a ground level adjusting apparatus according to the present invention will be described in detail with reference to the drawings. In the present specification, the same or similar reference numerals are given to different embodiments in the same or similar configurations. As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

Figs. 1A and 1B are conceptual diagrams of a ground level adjusting apparatus according to the present invention.

According to the drawings, the ground level control devices 100 and 200 control the ground level of the vehicle by supplying or discharging the fluid to the suspension cylinder 10. The suspension cylinder 10 may be, for example, a nitrogen cylinder of a pneumatic suspension having a damper.

The ground level control devices 100 and 200 are connected to a suspension cylinder 10 of a suspension installed in a vehicle body of a conventional vehicle using pipelines. In addition, a pressure sensor is mounted on the pipeline to measure the pressure of the fluid added to the suspension cylinder 10.

The ground level adjusting apparatuses 100 and 200 include control apparatus cylinders 110 and 210 connected to the suspension cylinder 10, a height sensor for measuring a height of the installed height of the vehicle, To the pressure of the desired suspension cylinder 10 or to the height of the garage. The controller may be an example of a control unit for controlling the driving of the ground-and-ground control device.

The controller controls the flow of the fluid in the regulating device cylinders 110 and 210 to the suspension cylinder 10 or the suspension cylinder 10 according to the height of the garage, It is automatically adjusted according to the road surface. However, unlike the illustration, the regulating device cylinders 110 and 210 may be provided in plural.

The ground-level control devices 100 and 200 driven by the above-described principle can be implemented by the structures of FIGS. 1A and 1B. First, the ground level control devices 100 and 200 commonly include first and second pipes 121 and 122, 221 and 222, first and second flow control valves 120 and 120 in addition to the control device cylinders 110 and 210, (131, 132, 231, 232).

The control cylinders 110 and 210 are movably arranged with pistons 113 and 213. Both ends of the control cylinders 110 and 210 are closed so that a plurality of chambers are formed by the pistons 113 and 213, . The first pipe and the second pipe (121, 122, 221, 222) are the pipeline connecting the regulating device cylinder and the suspension device cylinder. The first pipe and the second pipe (121, 122, 221, The first flow control valve and the second flow control valves 131, 132, 231 and 232 are respectively disposed.

The first and second pipes 121, 122, 221 and 222 are connected to both ends of the regulating device cylinders 110 and 210, respectively. The first and second flow control valves 131, 132, 231 and 232 are variable flow control valves that control the flow rate of the fluid at both ends of the regulating device cylinders 110 and 210, respectively. This variable flow control valve operates so that the flow rate can be adjusted at a required time by the controller.

A motor and a speed reducer for driving the pistons 113 and 213 are provided on one side of the regulating device cylinders 110 and 210, and the screw is connected to the motor through a speed reducer. More specifically, a male screw of a lead screw is provided at the output end of the speed reducer, and this male screw is engaged with a female screw provided on the pistons 113 and 213. To this end, one side of the piston (113, 213) is made of a female screw of a lead screw.

The ground level control devices 100 and 200 include the moving units 140 and 240 and the valve units 150 and 250. Fluid sections 140 and 240 are formed to allow fluid flow between a plurality of chambers of the regulator cylinder and valve sections 150 and 250 are configured to allow movement of the pistons 113 and 213, To control the fluid flow in the fluid passages 140 and 240 to regulate the fluid pressure in the suspension cylinder.

By controlling the valves in conjunction with the movement of the pistons 113 and 213 as described above, the fluid in the control device cylinders 110 and 210 flows out to the suspension cylinder 10 or flows in from the suspension cylinder 10 Can be performed.

Hereinafter, in addition to the basic structure described above, the structure and operation of the ground level adjusting apparatuses 100 and 200 of FIGS. 1A and 1B will be described in detail.

Figs. 2A to 2E are state diagrams showing the operation of the ground level adjusting device in a single cylinder structure. Fig.

Referring to FIGS. 1A and 1B, a first chamber 111 and a second chamber 112 are formed on both sides of the regulating device cylinder 110 with respect to the piston 113. To this end, Lt; RTI ID = 0.0 > a < / RTI > The valve portion 150 includes a check valve 151 disposed in the piston 113 to allow fluid to flow in one direction between the first chamber 111 and the second chamber 112.

Here, the quantity of the regulating cylinder 110 may be four, six or more, depending on the kind of the vehicle. For convenience of explanation, the regulated internal pressure of the suspension cylinder 10 is arbitrarily set to 4 bar .

FIG. 2A is a state diagram of a suspension cylinder and a ground level control apparatus in a case where the ground level is in a steady state in a single cylinder structure. FIG. In this state, the ground surface is at a normal height, and the piston 113 is positioned at the center (reference position), and the pressure of the gas is 4 bar.

2B shows a case in which the ground surface height is raised in a single cylinder structure. When the piston 113 moves in the direction of decreasing the volume of the second chamber 112 at the reference position to raise the ground level, 2 Open the flow control valve 132.

More specifically, FIG. 2B shows the step of applying pressure to the suspension cylinder of the vehicle body to raise the ground clearance, in which the piston 113 moves from the center of the adjustment cylinder to the right. At this time, the right side variable valve (second flow control valve) is opened and the pressure applied by the piston 113 is moved to the suspension cylinder of the vehicle body, and the pressure of the suspension cylinder is increased to 8 bar at 4 bar, Thereby pushing the body 113 upward.

In this example, it is set to 8 bar for convenience, but this pressure can be determined between 4 bar and 8 bar as the pressure required to raise the ground level of the vehicle to a desired height. Meanwhile, as the piston 113 of the control unit cylinder 110 moves from the center to the right end, the volume of the first chamber 111 increases and the pressure of the first chamber 111 decreases to 2 bar.

FIG. 2C shows a case of restoring the steady state in a state where the ground clearance is raised in a single cylinder structure, and subtracting the pressure applied to the suspension cylinder of the vehicle body to lower the vehicle body to a normal height. In this case, the piston 113 of the regulator cylinder 110 moves from right to center.

At this time, a pressure of 8 bar exists in the rear of the piston 113 and a pressure of 2 bar exists in front of the piston 113, so that the power for driving the piston 113 required to move the piston 113 is almost unnecessary Do not. When the piston 113 is positioned at the center of the regulator cylinder 110, the pressure in the suspension cylinder and the first and second chambers equals 4 bar.

2D is a step of depressurizing the suspension cylinder of the vehicle body in the case of lowering the ground clearance in the single cylinder structure.

In this case, when the piston 113 is moved back to the reference position after the piston 113 moves in the direction of decreasing the volume of the first chamber 111 at the reference position, the control unit for controlling the driving of the ground- The first flow control valve is opened and the check valve 151 is configured to allow the fluid in the first chamber 111 to flow into the second chamber 112. [

More specifically, this step operates in two stages. In the first step, the piston 113 moves from the center to the left in the regulator cylinder. The first flow control valve and the second flow control valves 131 and 132 are preferably closed and the check valve 151 located inside the piston 113 is opened to open the first and second chambers 111 and 112, The gas on the left side is switched to the right side without changing the pressure of the gas.

Next, as a second step for lowering the posture, the first flow control valve 131 on the left side is opened and the piston 113 is moved to the right side. Since the second flow control valve 132 on the right side is closed, the air pressure is increased from 4 bar to 8 bar and the cylinder is decreased from 4 bar to 2 bar. At this time, the piston 113 descends at a pressure of 2 bar at the rear and increases to a pressure of 8 bar at the front of the piston 113, so that a pressure for driving the piston 113 is required from 2 bar to 6 bar.

Lastly, FIG. 2E shows a case of restoring to a steady state in a state where the ground clearance is lowered in a single cylinder structure, and is simplified by opening the second flow control valve 132 on the right side.

Hereinafter, as another example of the present invention, a tandem cylinder structure will be described. Figs. 3A to 3E are state diagrams showing the operation of the ground level adjusting device in the tandem cylinder structure.

Referring to FIGS. 3A through 3E, the piston 213 of the regulating device includes first and second pistons 213a and 213b spaced from each other, and the first piston 213a is spaced apart from the first piston 213a. A first chamber and a second chamber (211, 212) are formed in the cylinder at a reference position disposed at one end of the cylinder.

The valve unit 250 may include a first valve (not shown) disposed in the first bypass pipe 251 that connects the first chamber 211 with the portion covered by the first piston at the reference position, And a second valve 253b disposed in a second bypass pipe 252 connecting the second chamber 212 with the portion covered by the second piston 213b at the reference position, .

FIG. 3A is a state diagram of a suspension cylinder and a ground level control apparatus in a case where the ground level is in a steady state in a tandem cylinder structure, in which the piston is located on the left side, and the pressure of the gas is all 4 bar.

FIG. 3B shows a case where the ground level is raised in the tandem cylinder structure, and the control unit for controlling the driving of the ground level adjusting apparatus moves the piston in the direction of decreasing the volume of the second chamber at the reference position, The first valve and the second flow control valve are opened.

More specifically, two pistons (first and second pistons) located in the regulator cylinder move from left to right. At this time, the first flow control valve on the left side is closed and the second flow control valve on the right side is opened, so that the pressure applied by the piston moves to the nitrogen cylinder of the vehicle body. In this case, the pressure of the suspension cylinder increases from 4 bar to 8 bar, pushing the piston, which causes the vehicle body to rise upward. Here, for convenience, it is set at 8 bar, but this pressure can be determined between 4 bar and 8 bar as the pressure required to raise the ground level of the vehicle to the desired height.

On the other hand, as the first valve 253a of the first chamber 211 is opened and the second valve 253b of the right side is closed and the piston of the cylinder moves from left to right, the pressure of the left and right chambers falls to 2 bar .

FIG. 3C shows a case of restoring the tandem cylinder structure to a steady state in a state where the ground clearance is raised, and subtracting the pressure applied to the suspension cylinder.

In this case, the piston of the regulator cylinder moves from right to left center. At this time, there is a pressure of 8 bar at the rear of the piston, and there is a pressure of 2 bar at the front of the piston, so there is little power required to drive the piston necessary to move the piston. When the piston is positioned at the center of the cylinder, the pressure in the suspension cylinder and the first and second chambers 211 and 212 becomes equal to 4 bar.

FIG. 3D shows a case of lowering the ground clearance in the tandem cylinder structure.

In this case, in order to lower the ground clearance, the control unit for controlling the driving of the ground-level control device controls the second valve 253b when the piston moves in the direction of decreasing the volume of the second chamber 212 at the reference position, And the first flow control valve 231 are opened.

More specifically, the piston moves from left to right, the left first flow control valve 231 is open and the right second flow control valve 232 is closed. Since the first valve 253a at the lower stage is closed, the pressure of the cylinder is reduced from 4 bar to 2 bar while moving the gas to the second chamber 212.

On the other hand, since the second valve 253b on the right side is in an open state and the right second flow control valve 232 is in a closed state, while the piston of the right chamber moves from left to right, the pressure is reduced to the second valve 253b And then returns to its original position. The pressure on the right side therefore rises to 8 bar, which requires a pressure of up to 6 bar to drive the piston.

FIG. 3E shows a case in which the ground surface is lowered to a normal state in the tandem cylinder structure. In this case, all the valves are opened and the piston of the ground control cylinder moves to the left side and returns to the normal operating height.

The above-described ground level adjusting device is not limited to the configuration and the method of the embodiments described above, but all or some of the embodiments may be selectively combined so that various modifications may be made to the embodiments.

Claims (9)

A ground level adjusting device for adjusting a ground level of a vehicle by supplying or discharging fluid to a suspension cylinder,
A regulating device cylinder in which both ends are closed so that a plurality of chambers are formed by the piston;
A first pipe and a second pipe connecting the regulating device cylinder and the suspension device cylinder;
A first flow control valve and a second flow control valve respectively disposed in the first pipe and the second pipe;
A flow portion formed to allow fluid flow between a plurality of chambers of the regulator cylinder; And
And a valve portion for controlling the flow of the fluid in the fluid portion so as to regulate the hydraulic pressure of the suspension cylinder using the movement of the piston and the flow of the fluid. The method according to claim 1,
A first chamber and a second chamber are formed on both sides of the regulating device cylinder with respect to the piston,
Wherein the valve portion comprises a check valve disposed in the piston and allowing flow of fluid in one direction between the first chamber and the second chamber. 3. The method of claim 2,
The control unit for controlling the driving of the ground-
And opens the second flow control valve when the piston moves in a direction in which the volume of the second chamber decreases in the reference position to raise the ground clearance. The method of claim 3,
The control unit for controlling the driving of the ground-
Wherein when the piston moves to a reference position and moves backward in a direction in which the volume of the first chamber decreases,
Wherein the first flow control valve is opened during the restoration and the check valve is configured to allow fluid in the first chamber to flow into the second chamber. 3. The method of claim 2,
Wherein the piston is a single piston moving by rotation of the screw, and the screw is connected to the motor through a speed reducer. The method according to claim 1,
The piston having first and second pistons spaced apart from each other,
Wherein a first chamber and a second chamber are formed in the cylinder at a reference position in which the first piston is disposed at one end of the cylinder. The method according to claim 6,
The valve unit includes:
A first valve disposed in a first bypass pipe connecting the first chamber and the portion covered by the first piston at the reference position,
And a second valve disposed in a second bypass pipe connecting the second chamber and the portion covered by the second piston at the reference position. 8. The method of claim 7,
The control unit for controlling the driving of the ground-
And opens the first valve and the second flow control valve when the piston moves in a direction in which the volume of the second chamber decreases in the reference position to raise the ground clearance. 8. The method of claim 7,
The control unit for controlling the driving of the ground-
And opens the second valve and the first flow control valve when the piston moves in a direction in which the volume of the second chamber decreases in the reference position to lower the ground clearance.

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