KR20010003110A - air suspension system for a vehicle - Google Patents

Abstract

PURPOSE: An air-suspension is provided to rapidly stabilize a vehicle condition when in sharp cornering by discharging the compressed air of an air spring inside a curve, and to prevent the damage of the air spring by preventing the rapid load increase outside a curve. CONSTITUTION: An air-suspension contains the characteristics: for an air-suspension containing an air spring(1), which is independently mounted between a body frame(11) and a wheel axle(12), and a leveling valve(10), which is connected with the air spring through an air duct(3) and supplies a surge tank(2) with a compressed air or discharges the compressed air within the air spring into the atmosphere according to the load applied to a vehicle; an assistant leveling valve(20) having an assistant lever(21), which is linked by a lever(14), is mounted on the upper of the leveling valve, connected through the air spring and an assistant air line(22), if the lever of the leveling valve in the side inside a curve is raised, the assistant lever opens the assistant leveling valve, so the compressed air in the air spring of the other side is discharged into the atmosphere.

Description

Air suspension system for a vehicle

The present invention relates to an air suspension of an automobile, and in particular, it is possible to prevent the breakage of the air spring due to a sudden increase in load while maintaining a stable vehicle attitude while driving on a curved road. It relates to an air suspension of a vehicle.

In general, the suspension of the vehicle is mounted for the purpose of mitigating the impact transmitted from the road surface to the vehicle body to improve the riding comfort, and adjusts the supply and discharge of compressed air in the suspension for performing such a purpose. There is an air suspension device to stabilize the posture by appropriately controlling the ground height of the vehicle according to the load loaded on the vehicle body, the configuration thereof is as shown in FIG.

That is, the air suspension device is installed independently of the air spring (1) having a surge tank (2) on each of the front and rear wheel side of the vehicle, the air spring (1) is again an air flow pipe (3) It is connected to the pressure control valve (4) through the pressure control valve (4) is connected to the air compressor (5), while the auxiliary tank (6) and the drain (7) on the air flow path (3) Each is installed.

Accordingly, the air compressed by the air compressor (5) is adjusted to a constant pressure through the pressure control valve (4) and then flows into the surge tank (2) installed in each wheel through the air flow pipe (3) The compressed air introduced into the surge tank 2 is properly introduced into the air spring 1 or discharged from the air spring 1 under the control of a leveling valve (not shown). As a result, the air spring 1 In addition to keeping the height of the vehicle body stable while driving, the shock transmitted from the road surface is alleviated.

Meanwhile, in the above air suspension device, the air spring 1 is installed between the body frame 11 and the axle support member 13 extending from the axle 12, as shown in FIG. The leveling valve 10 for supplying or discharging compressed air appropriately in accordance with the load applied to the vehicle body is fixedly installed at the vehicle body side, and an air flow path is provided between the air spring 1 and the leveling valve 10. (3) is connected.

In addition, the leveling valve 10 is provided with a lever 14, one end of which is coupled to the support rod 15 connected from the axle support member 13, which is adapted to change the load applied to the vehicle body. Accordingly, when the separation distance between the body frame 11 and the axle 12 changes, it is rotated in the vertical direction to open or close the air line inside the leveling valve 10 so that the compressed air is air spring (1). Should be allowed to enter or discharge into the atmosphere.

To this end, the leveling valve 10 has an inlet port 10a communicating with the surge tank 2 and the air flow passage 3 in which compressed air is stored, and the air spring 1 and also the air flow passage. An outlet port 10b communicating through (3) is provided, and an exhaust port 10c for discharging the compressed air stored in the air spring 1 into the atmosphere.

Here, the inlet port 10a, the outlet port 10b and the exhaust port 10c of the leveling valve 10 are selectively opened or closed by the rotation of the lever 14, for this purpose, the leveling valve ( As shown in FIGS. 3A, 3B, and 3C, the first moving member 16 selectively controls the opening and closing of the inflow port 10a and the opening and closing of the exhaust port 10c. The second moving member 17 is adjusted to the bar, and the first moving member 16 and the second moving member 17 are respectively supported on the rear surface of the lever spring 14 via the return spring 18. ) Is selectively pushed and moved by the pressing member 19 having protrusions 19a and 19b which are spaced apart vertically so as to be integrally rotated according to the rotation of.

Accordingly, when the lever 14 is in the neutral position, as shown in FIG. 3A, the protrusions 19a and 19b of the upper and lower portions of the pressing member 19 are respectively the first moving member 16 and the second moving member. In the state spaced apart from the moving member 17, the inlet port (10a) and the exhaust port (10c) of the leveling valve 10, respectively, the first moving member whose back is elastically supported by the return spring (18) 16 and the second moving member 17 are closed to supply compressed air from the surge tank 2 to the air spring 1, as well as in the air spring 1 through the exhaust port 10c. The discharge of compressed air is eliminated.

Then, the load applied to the body frame 11 is increased, or the load due to the impact is transmitted from the road surface to the vehicle body so that the separation distance between the body frame 11 and the axle 12 is narrowed, so that the lever 14 When rotated upward, as shown in FIG. 3B, only the protrusion 19a on the upper side of the pressing member 19 comes into contact with the first moving member 16 and pushes it, thereby the leveling valve 10 The inlet port (10a) of the open) is supplied with compressed air from the surge tank (2) through the outlet port (10b) into the air spring (1) to expand the air spring (1), the body frame ( The clearance distance narrowed between 11) and the axle 12 is returned to its original state.

In addition, when the load applied to the body frame 11 is reduced and the separation distance between the body frame 11 and the axle 12 is increased so that the lever 14 is rotated downward, as shown in FIG. 3C. As described above, only the protrusion 19b of the lower side of the pressing member 19 comes into contact with the second moving member 17 and pushes it, so that the exhaust port 10c of the leveling valve 10 opens and the air is opened. Since the compressed air existing in the spring 1 is discharged into the atmosphere through the exhaust port 10c and the air spring 1 is contracted, the separation distance widened between the body frame 11 and the axle 12 is returned to its original state. do.

By the way, when the vehicle equipped with the air suspension as described above makes a sharp turn while traveling on a curved road surface, the air spring 1 on the opposite side of the swing is greatly contracted under the load of the vehicle body, while the air spring on the swing side (1) is relatively inflated under the load of the vehicle body, in which case the leveling valve 10 on the opposite side of the swing acts as shown in Figure 3b to the compressed air in the air spring (1) installed on the opposite side of the swing While the vehicle stance is stabilized by supplying the compressed air, compressed air is supplied from the surge tank 2 to the air spring 1 through the air flow passage 3 and the leveling valve 10 to recover the garage normally. Since the time required is relatively long, there was a disadvantage in that the responsiveness was inferior, which is considered that the air spring 1 is mounted to improve ride comfort and controllability. When viewed, such as the deterioration in response is to act as an absolute negative to improve the riding comfort.

In addition, the air spring (1) installed on the opposite side of the turn during the sudden turn in the curved road surface is contracted due to the sudden load of the vehicle body, if such a phenomenon occurs repeatedly, the air spring (1) There was a disadvantage in that it causes a fatal damage to shorten the life of the air spring (1).

Accordingly, the present invention has been devised to solve the above-mentioned disadvantages, and it is possible to discharge the compressed air remaining in the air spring on the turning side to the atmosphere when turning sharply curved roads to maintain the stance of the vehicle stably in a short time. The purpose of the present invention is to provide a vehicle air suspension device that can prevent damage to the air spring by improving the riding comfort and preventing a sudden increase in load on the opposite side of the turning.

The present invention for achieving the above object, according to the load applied to the vehicle by the air spring connected to the left and right sides of the vehicle independently between the body frame and the axle, and the air spring via the air flow path In an air suspension of an automobile adapted to control a garage, with a leveling valve adapted to supply compressed air in a surge tank or to discharge compressed air stored in an air spring into the atmosphere, the upper part of the leveling valve being pivoted by a lever. Auxiliary leveling valves with auxiliary levers interlocked with each other are installed, and these auxiliary leveling valves communicate with each other through air springs and auxiliary air flow lines on the opposite side, and the lever of the leveling valve installed on the side where the load increases when turning is raised. The auxiliary lever opens the auxiliary leveling valve The shaft is configured to discharge into the atmosphere the air characterized.

1 is a schematic diagram showing the configuration of an air suspension device of a conventional vehicle;

Figure 2 is a state diagram showing the mounting state of the air spring in the air suspension shown in Figure 1,

3A, 3B, and 3C are cross-sectional views illustrating the operation of the leveling valve shown in FIG. 2, respectively.

4 is a state diagram showing the configuration of an air suspension device according to the present invention;

5A, 5B, and 5C are cross-sectional views illustrating operations of the auxiliary leveling valve illustrated in FIG. 4, respectively.

<Description of Symbols for Main Parts of Drawings>

1-air spring 2-surge tank

3-Air Flow Line 10-Leveling Valve

11-body frame 12-axle

13-axle support member 14-lever

20-auxiliary leveling valve 20a-suction port

20b exhaust port 21 auxiliary lever

22-Secondary air flow line 23-Moving member

24-return spring 25-pressure member

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

Figure 4 is a state diagram showing the configuration of the air suspension according to the present invention, for the detailed description of the embodiment of the present invention in the same reference region as in Figures 1 to 3 showing the air suspension of a conventional vehicle. The same reference numerals will be given together, referring to this.

As shown in the figure, the air spring (1) provided between the body frame 11 and the axle support member (13) of the turning side when the load is concentrated on the opposite side of the turning during the sharp turn of the road surface is severely curved The vehicle body frame 11 and the axle 12 are configured to stabilize the vehicle's behavior by releasing the compressed air enclosed in the air to maintain the same level of the turning side and the opposite side of the turning side in a short time. The auxiliary leveling valve 20 is provided on the upper part of the leveling valve 10 to supply or discharge the compressed air appropriately according to the load applied to the vehicle body by the air spring 1 installed between the axle support members 13 extending from the auxiliary shaft. The auxiliary leveling valve (20) is installed in the leveling valve (10) and the auxiliary lever (21) in an adjacent position so as to rotate in conjunction with the lever (14) rotated according to the load of the vehicle body. Is installed, and the auxiliary leveling valve 20 having the auxiliary lever 21 communicates with the air spring 1 on the opposite side and the auxiliary air flow passage 22.

That is, the auxiliary leveling valve 20 located on the left side of the vehicle communicates with the air spring 1 on the right side and the auxiliary air flow passage 22, and the auxiliary leveling valve 20 located on the right side of the vehicle has a left side. The air spring 1 and the auxiliary air flow passage 22 are in communication with each other, that is, the auxiliary air flow passage 22 is piped in a "Ｘ" shape to the vehicle body, respectively.

In addition, the auxiliary leveling valve 20 has an intake port 20a communicating with the air spring 1 in which the compressed air is stored and the auxiliary air flow passage 22, and the compressed air stored in the air spring 1. An exhaust port 20b for discharging into the atmosphere is provided, and the suction port 20a and the exhaust port 20b are provided in the auxiliary leveling valve 20, respectively, and the lever 14 provided in the leveling valve 10 is provided. ) Is selectively opened and closed by the auxiliary lever 21 which is interlocked and rotated according to the rotation.

To this end, the auxiliary leveling valve 20, as shown in Figures 5a, 5b, 5c, respectively, opening and closing of the suction port 20a communicated through the air spring (1) and the auxiliary air flow passage (22) The moving member 23 for selectively adjusting the bar is provided, the moving member 23 is the upper side so that the rear side is integrally rotated in accordance with the rotation of the auxiliary lever 21 while being elastically supported via the return spring (24) It is selectively pushed and moved by the press member 25 provided with the projection part 25a which protruded.

Here, the operation of the auxiliary leveling valve 20 according to the rotation of the lever 14 is as follows.

First, when the auxiliary lever 21 is in the neutral position, as shown in FIG. 5A, the protrusion 25a formed above the pressing member 25 maintains a state spaced apart from the moving member 23. The suction port 20a of the auxiliary leveling valve 20 is closed by the movable member 23 whose back is elastically supported by the return spring 24 so that the traffic between the suction port 20a and the exhaust port 20b is closed. Is disconnected, whereby compressed air stored in the air spring 1 on the opposite side communicated with the auxiliary air flow passage 22 cannot flow to the exhaust port 20b by the closed suction port 20a. .

On the contrary, the load applied to the vehicle body frame 11 is increased, or the load due to the impact is transmitted from the road surface to the vehicle body so that the separation distance between the vehicle body frame 11 and the axle 12 is narrowed and the leveling valve 10 is reduced. When the lever 14 of the) rotates upward, the auxiliary lever 21 of the auxiliary leveling valve 20 rotates upward. As shown in FIG. 5B, the upper protrusion of the pressing member 25 is rotated. (25a) is pushed while in contact with the moving member 23, so that the suction port 20a of the auxiliary leveling valve 20 is opened while the suction port 20a and the exhaust port 20b are in a traffic state. Compressed air stored in the air spring 1 on the opposite side is discharged into the atmosphere through the exhaust port 20b, and the air spring 1 on the opposite side is rapidly contracted.

In addition, the load applied to the body frame 11 is reduced, so that the separation distance between the body frame 11 and the axle 12 is increased, so that the lever 14 is rotated downward, so that the auxiliary leveling valve 20 When the auxiliary lever 21 is rotated in the downward direction, as shown in FIG. 5C, when the protrusion 25a of the pressing member 25 is the auxiliary lever 21 in the neutral position, the moving member 23 is likewise. And the air is separated from the suction port 20a and the exhaust port 20b of the auxiliary leveling valve 20 so that the compressed air stored in the air spring 1 on the opposite side is discharged to the atmosphere. It becomes impossible.

Hereinafter, the operation of the air suspension of the vehicle according to the present invention will be described in detail.

First, when the vehicle travels on a road with a severe curvature of the road, when the vehicle makes a sharp left turn, a sudden load movement occurs to the right side of the vehicle body on the opposite side of the turn, and thus the air spring 1 installed to the right side of the vehicle body undergoes a sudden compressive force. In this case, the lever 14 is rotated upward by the support rod 15 so that the leveling valve 10 is reversely rotated on the right side of the compressed air in the surge tank 2 as before. It is supplied to the air spring (1).

On the other hand, while the compressed air is supplied to the turn opposite side right air spring 1 as described above, the auxiliary lever 21 is pushed by the lever 14 which is rotated upward to control the operation of the leveling valve 10. ) Is pushed upward, the suction port 20a and the exhaust port 20b of the auxiliary leveling valve 20 on the opposite side of the swing side communicate with each other, so that the compressed air in the air spring 1 mounted on the swing side Is discharged into the atmosphere through the intake port 20a and the exhaust port 20b of the auxiliary leveling valve 20 on the opposite side of the swing side through the auxiliary air flow passage 22, so that the air spring 1 on the swing side suddenly becomes The height of the air spring 1 mounted on the swing side and the swing reverse side, respectively, can be adjusted to a similar level within a short time.

After the end of the turning, the air spring 1 having the height lowered on the turning side and the turning opposite side is made of the controller of the leveling valve 10 by the lever 14 again, and is turned back to the air springs 1 on both sides. Since the compressed air in the tank 2 is replenished, it is possible to maintain a normal garage.

Therefore, as well as having an auxiliary leveling valve 20 communicated through the air spring 1 and the auxiliary air flow passage 22 installed between the body frame 11 and the axle support member 13 on the opposite side as described above. When the opening and closing of the auxiliary leveling valve 20 is rotated according to the load of the vehicle and is controlled by the auxiliary lever 21 rotated by the lever 14 involved in the opening and closing operation of the leveling valve 10, the bending Compressed air in the air spring (1) installed between the body frame (11) and the axle support member (13) on the turning side even when the load of the vehicle is concentrated on the opposite side of the turning at the time of sharp turning while driving this severe road surface. Since the vehicle 20 can be discharged to the atmosphere through the valve 20, the vehicle can be stably recovered in a short time, thereby improving the responsiveness of the suspension device to return to the normal garage.

In addition, as the load is concentrated on the opposite side of the turn at the time of sudden turning as described above, the air spring 1 is rapidly contracted, thereby releasing the compressed air of the air spring 1 mounted on the turning side into the atmosphere, thereby providing air on both sides. When the height of the spring 1 can be adjusted to the same level within a short time, the burden of the compressive force applied to the air spring 1 on the opposite side of the swing can be reduced, thereby preventing damage to the air spring 1.

As described above, according to the air suspension apparatus of the automobile according to the present invention, when the load of the vehicle is concentrated on the opposite side of the turning side at the time of turning sharply on the curved road, the compressed air of the air spring installed on the turning side is turned to the opposite side of the turning side By discharging to the air in a short time through the auxiliary leveling valve installed and operated, it stabilizes the vehicle's posture and improves the riding comfort, and it also reduces the burden of compression force applied to the air spring. It can be effective.

Claims (2)

A load applied to the vehicle by connecting the air spring 1 independently installed between the body frame 11 and the axle 12 to the left and right sides of the vehicle and the air flow passage 3 connected to the air spring 1. According to the present invention, an air suspension device of a vehicle adapted to control a garage by having a leveling valve 10 adapted to supply compressed air in the surge tank 2 or to discharge compressed air stored in the air spring 1 into the atmosphere. To The upper leveling valve 10 is provided with an auxiliary leveling valve 20 having an auxiliary lever 21 interlocked with the rotation of the lever 14, respectively, and the auxiliary leveling valve 20 has an air spring (opposite side) 1) and the auxiliary air flow passage 22, the auxiliary lever 21 is connected to the auxiliary leveling valve 20 when the lever 14 of the leveling valve 10 installed on the side where the load increases when turning is increased. Air suspension of the vehicle, characterized in that configured to release compressed air stored in the opposite air spring (1) to the atmosphere. The auxiliary auxiliary leveling valve (20) according to claim 1, wherein the auxiliary leveling valve (20) communicates with the air spring (1) and the auxiliary air flow passage (22) opposite to each other, and the suction port (20a) is opened. And an exhaust port 20b for releasing compressed air into the atmosphere. The moving member 23 is installed in the suction port 20a via a return spring 24 so as to be supported. The air suspension of the vehicle, characterized in that the pressing member (25) having a projection (25a) for selectively pressing in accordance with the rotation of the auxiliary lever 21 is disposed somewhat apart.