JPH0121842Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a leveling device for a vehicle, and in particular, in an air suspension type vehicle, when a disturbance occurs, the disturbance is attenuated by controlling the amount of air supplied to the bellows. The present invention relates to a vehicle leveling device.

Traditionally, air suspension vehicles,
For example, in large buses, bellows made by filling air in an air chamber are used as air springs (for example,
(See Japanese Patent Application Laid-Open No. 58-4613). FIG. 1 shows a conventional vehicle leveling device using a bellows as described above. Normally, bellows are provided corresponding to each of the four wheels of a vehicle, but FIG. 1 shows an air supply system with only one bellows.

In Fig. 1, 1 is a compressor, 2 is an air tank that stores high-pressure air supplied from compressor 1, and 3 is a compressor that converts the high-pressure air supplied from tank 2 into low-pressure air according to the amount of change in vehicle height. This is a leveling valve that supplies air to the bellows 4. Therefore, when the chassis becomes lower with respect to the axle, that is, when the vertical distance between a certain bellows 4 becomes narrower, low-pressure air is supplied from the leveling valve 3 to the bellows 4 in an amount corresponding to the change in vehicle height. be done. As the supply of low-pressure air continues, the portion of the vehicle body suspended via the bellows 4 will be raised accordingly. As a result, while the vehicle height is restored, the supply of low pressure air from the leveling valve 3 to the bellows is stopped. Further, when the vehicle height becomes higher than the standard height, air in the bellows 4 is discharged via the leveling valve 3. Such a series of operations is repeatedly performed in response to changes in the height of the vehicle body, so that the vehicle body is always maintained at a standard height.

However, in this type of conventional leveling device, in order to improve riding comfort,
Since the bellows 4 having a relatively small spring constant is used as an air spring, the leveling valve 3 is operated more frequently due to changes in the road surface, resulting in increased air consumption. To prevent this, the air is passed through an orifice and the air flow rate is restricted to the bellows 4.
I am trying to send it to. Because of this orifice,
When a disturbance such as rolling, pitching, nose type, etc. occurs in a vehicle, the response time required to deal with the disturbance is relatively long, resulting in a lack of quick response. Therefore, other mechanisms such as stabilizer rods and torque rods have been used to ensure driving performance.

The present invention was devised in consideration of the above-mentioned actual situation, and is intended to be used in rolling and rolling conditions other than steady running conditions.
By controlling the amount of air supplied to the bellows when a disturbance such as pitching or nose dive occurs, the disturbance can be quickly and smoothly suppressed, improving cornering performance, braking or acceleration. An object of the present invention is to provide a vehicle leveling device that can improve driving performance such as posture stability.

The features of the present invention include (a) a high-pressure air supply source that supplies high-pressure air; (b) high-pressure air is supplied from the high-pressure air supply source, and low-pressure air is supplied and released in an amount corresponding to changes in vehicle height. (c) a sensor that detects a disturbance occurring in the vehicle; (d) an opening/closing valve that allows high-pressure air from the high-pressure air supply source to pass through based on the disturbance detected by the sensor; (e) If no disturbance is detected by the sensor, low pressure air from the leveling valve is supplied to the bellows, while if disturbance is detected by the sensor, high pressure air is supplied from the opening/closing valve. and a relay valve mechanism configured to supply air to the bellows.

Hereinafter, a first embodiment of a vehicle leveling device to which the present invention is applied will be described with reference to FIGS. 2 to 7. In these figures, parts common to those in FIG. 1 are given the same reference numerals.

As shown in FIG. 2, the leveling device A of this embodiment has an air supply source 6 consisting of a compressor 1 and a tank 2, and high pressure air is supplied from the tank 2. . High-pressure air from the tank 2 is supplied to the air inlet a of the leveling valve 3 through the high-pressure line 7, and as described later, from the air outlet b of the leveling valve 3, an amount of air corresponding to changes in vehicle height relative to the chassis is supplied. Low pressure air is supplied to the air inlet c of the dual relay valve 9 through a low pressure line 8.

Further, high pressure air is supplied from the tank 2 through the high pressure line 10 to the dual relay valve 9 described above.
At the same time, high pressure air is supplied to an electromagnetic valve (opening/closing valve) 12 through a high pressure line 11. This electromagnetic valve 1
2 is opened when a disturbance detection sensor 13 (to be described later) detects that a disturbance has occurred in the vehicle, and is closed when no disturbance is detected. When the electromagnetic valve 12 is opened, high-pressure air is supplied to the air inlet e of the dual relay valve 9 through the electromagnetic valve 12. Further, as will be described in detail later, an amount of air corresponding to the state of the vehicle is supplied to the bellows 4 from the air outlet f of the dual relay valve 9 through a line 14.

FIG. 3 shows an example of the actual arrangement of the leveling device A as described above in a vehicle. As is clear from FIG. 3, in this embodiment, one compressor 1, one tank 2, and a pair of left and right leveling valves 3 are shared. Bellows 4 are provided corresponding to the left and right wheels 15 and 16, respectively, and an electromagnetic valve 12, a sensor 13, and a dual relay valve 9 are provided to supply air to these bellows 4, respectively.

Next, the structure of the above-mentioned leveling valve 3 will be explained based on FIG. 4.

First, the leveling valve 3 includes a base body 20 having a communication hole 20a and an orifice 20b,
A fitting member 21 is fitted to the side of one end. The through hole formed in this fitting member 21 serves as the air introduction port a described above. on the other hand,
The other end of the base body 20 is closed by closing members 22 and 23.

Further, a compression coil spring 24 is disposed between the base body 20 and the fitting member 21, and the biasing force of the compression coil spring 24 causes the crimping plates 25, 26 to move toward the base body 20 and the fitting member 21. Each is energized. Further, a through hole 28 is formed in the base body 20 at a location corresponding to the crimp plate 25, and a pressed rod 29 having a diameter slightly smaller than the inner diameter of the through hole 28 is movable in the axial direction within the through hole 28. It is arranged. On the other hand, the base body 20 has the pressed rod 2
A fitting member 30 is fitted in a position corresponding to 9, and a pressed rod 31 is disposed within a through hole 30a formed in this fitting member 30 so as to be movable in the axial direction. A pressing member 32 is provided within the communication hole 20a of the base body 20 at a location corresponding to the pressed rod 31, and the pressing member 32 and the pressed rod 29 are opposed to each other.

Further, a compression coil spring 34 is disposed within the communication hole 20a of the base body 20 at a location where the closing member 23 is located, and a through hole 35 is provided at a location of the base body 20 corresponding to one end of this compression coil spring 34. ing. Inside the through hole 35 is a pressed rod 36.
is disposed so as to be movable in the axial direction, and the through hole 35 is configured to be sealed by a pressure bonding plate 37 which is pressed and biased by the biasing force of the compression coil spring 34.

Further, the leveling valve 3 includes a rotating member 41 configured to be rotatable around a rotating shaft 40 . This rotating member 41 is provided with pressing portions 42a and 42b that face each other with a slight gap at the ends of the previously described pressed rods 31 and 35, and as the rotating member 41 rotates, the pressed rods 31 ,35
are selectively pressed by the pressing portions 42a and 42b. In addition, the rotating member 41
is housed in a casing 43, and this casing 43 is provided with an air circulation hole 44.

On the other hand, the rotating shaft 40 is fixed to the tip of a rotating lever 46 (not shown), and the rotating lever 46 rotates in the directions of arrows D and D' in FIG. 4 about the rotating shaft 40. It is considered possible. The other end of the rotating lever 46 is rotatably attached to the upper end of a rod whose lower end is fixed to a chassis (not shown). Thus, the pivot lever 46 is rotated in response to a change in the vehicle height relative to the chassis, that is, in response to a relative change in the distance between the unsprung portion and the unsprung portion of the vehicle suspension spring. There is.

Next, the configuration of the dual relay valve 9 will be explained based on FIG. 5.

The dual relay valve 9 includes an upper half 48 and a lower half 49 that are integrally connected to each other in a fitted state. The above-mentioned upper half 48 is provided with the above-mentioned air inlets c and e, and a first piston 50 is disposed above and a second piston 51 is disposed below so as to be able to reciprocate in the vertical direction. . That is, the central cylindrical portion 50a of the first piston 50 is fitted into the central hole 52 communicating with the air inlet c so as to be slidable in the vertical direction, and the outer circumferential surface of the first piston 50 is fitted into the cylindrical surface of the upper half 48. 53 so as to be slidable. Further, the central cylindrical portion 51a of the second piston 51 is fitted into the central hole 54a of the lower half 49 so as to be slidable in the vertical direction, and the outer peripheral surface of the second piston 51 is slidably fitted into the cylindrical surface 53 of the upper half 48. It can be installed freely. This second piston is always urged upward by the urging force of the compression coil spring 57.

On the other hand, the low pressure air supplied through the air inlet c is supplied to the central cylindrical portion 50a of the first piston 50.
The first piston 5 passes through the through hole 55 provided in the
0 and the second piston 51. Also, air inlet e
The first and second pistons 50, 51 are pressed downward by high pressure air supplied through the pistons.

Furthermore, a fitting member 58 is fitted into the center hole 54b of the lower half 49, and this fitting member 58
The cylindrical member 59 is supported slidably in the vertical direction, and is constantly urged upward by the urging force of the compression coil spring 60.

Therefore, when the vehicle is running normally, that is, when no disturbance is occurring, the cylindrical member 59 is urged upward by the urging force of the compression coil spring 60.
A covering member 61 attached to the upper peripheral edge portion is pressed against the receiving surface 62 of the lower half 49. On the other hand, the second piston 51 is urged downward by low-pressure air supplied through the air inlet c and the through hole 55 of the first piston 50, and its lower end surface 51b is connected to the cylindrical member. 59 is crimped to the covering member 61. As a result, the through hole 59a of the cylindrical member 59 is closed by the second piston 51.

Further, the lower half 49 is provided with an air inlet d, which communicates with the center hole 54b of the lower half 49.

Next, the configuration of the disturbance detection sensor 13 will be explained based on FIGS. 6 and 7.

6 and 7, 64 is a casing, 65 is a rotating shaft rotatably attached to the casing 64 via a boss 66, and 67 has an arcuate protrusion 67a on a part of the circumferential surface, and the above-mentioned A rotating plate 68 is fixed coaxially to the rotating shaft 65, a rotating lever 68 has one end fixed to the rotating shaft 65, and 69a and 69b are detection element supporting members. Note that the disturbance detection sensors 13 are arranged at multiple locations on the vehicle, and for example, two sensors 13 are provided corresponding to four axles, respectively. The other end of the rotating lever 68 of one of the sensors 13 is configured to rotate around a rotating shaft 65 in accordance with the amount of movement of the chassis in the left-right direction of the vehicle with respect to the axle, and the rotating lever 68 of one of the sensors 13 The other end of 68 is configured to rotate about rotation axis 65 in accordance with the amount of movement of the chassis in the longitudinal direction of the vehicle with respect to the axle. The above-mentioned detection element support members 69a, 69
b has a U-shaped cross section as shown in FIG. 7, and although not shown, a light emitting element made of a light emitting diode or the like and a light receiving element made of a photodiode or the like are arranged in upper and lower opposing parts 70a and 70b so as to correspond to each other. installed. When the vehicle is running steadily, the arcuate protrusion 67 of the rotating plate 67 is located between the light emitting element and the light receiving element of the pair of support members 69a and 69b.
If the rotary lever 68 rotates due to the occurrence of a disturbance, the rotation plate will move between the light emitting element and the light receiving element of one of the support members 69a and 69b depending on the direction of rotation. 67 arcuate protrusions 67
It is configured to be blocked by a.

Next, the operation of the leveling device A configured as above will be explained.

First, we will discuss the operation during steady running.

High pressure air from compressor 1 is transferred to tank 2.
High pressure air is stored in the tank 2 and supplied to the air inlet a of the leveling valve 3 through the line 7. This high-pressure air presses and moves the crimp plate 26 against the biasing force of the compression coil spring 24, so that the high-pressure air enters into the compression coil spring installation portion 27. On the other hand, since the rotating lever 46 is in the normal rotating position, the pressing parts 42a and 42b of the rotating member 41 are pressed against the pressed rod 3 as shown in FIG.
1, 35. For this reason, the pressing member 32
and the fitting member 30 and the base body 2 by the crimping plate 37.
The through holes 30a and 35 of No. 0 are sealed. Further, since the pressed rod 29 is not pressed, the through hole 28 of the base body 20 is sealed by the pressure bonding plate 25.

Thus, the high-pressure air supplied from the tank 2 is supplied to the compression coil spring installation portion 27 through the air inlet a of the leveling valve 3, but is not supplied into the communication hole 20a of the base body 20. In addition,
As will be described later, the operation of supplying high-pressure air from the tank 2 to the communication hole 20a or releasing the high-pressure air to the atmosphere is repeated depending on the vehicle height, and due to the presence of the orifice 20b in the communication hole 20a. Since the pressurization or depressurization operation is slow, low pressure air is always supplied from the air outlet b of the leveling valve 3 to the air inlet c of the dual relay valve 9. Then, the low pressure air passes through the through hole 55 of the first piston 50 into the space 56.
The second piston is pushed downward against the biasing force of the compression coil spring 57. As a result, the lower end surface 51b of the second piston 51 is pressed against the covering member 61 of the cylindrical member 59, and the receiving surface 61 of the covering member 61 and the lower half 49
The crimped state between the two is maintained by the biasing force of the compression coil spring 60.

On the other hand, since no disturbance is detected by the sensor 13 during steady running, no disturbance detection signal (for example, ON signal) is supplied from the sensor 13 to the electromagnetic valve 12. Therefore, this electromagnetic valve 12 is placed in a closed state, and high pressure air from the tank 2 is cut off here and is not supplied to the air inlet e of the dual relay valve 9. Therefore, the upper surface of the first piston 50 is brought to atmospheric pressure, while the lower surface thereof is brought to a pressure higher than atmospheric pressure by the low-pressure air from the leveling valve 3. 2 piston 51 and is arranged at an upper position.

Under such a state, the central hole 54a of the lower half 49 is closed by the covering member 61 of the cylindrical member 59 and the second piston 51. Therefore,
High-pressure air from the tank 2 is supplied into the center hole 54b of the lower half 49 through the air inlet d of the dual relay valve 9, and this high-pressure air is supplied to the center hole 54a of the lower half 49 and then to the air outlet f. is not supplied. Therefore, as long as the vehicle height is maintained within a predetermined range, high pressure air will not be supplied to the bellows 4 or high pressure air within the bellows 4 will be discharged.

Next, in case the vehicle height is lowered,
In this case, the rotating lever 46 rotates in the direction of arrow D in FIG. 4 about the rotating shaft 40. Along with this, one pressing portion 42a of the rotating member 41 comes into contact with the pressed rod 31 and presses it. Then, since the pressing member 32 contacts and presses the pressed rod 29, the pressing plate 25 is pressed and moved against the biasing force of the compression coil spring 24, and the through-hole 29 of the base body 20 is moved.
8 is left open. As a result, high-pressure air from the tank 2 is supplied into the communication hole 20a of the base body 20 via the air inlet a of the leveling valve 3, the compression coil spring installation part 27, and the through hole 28, and then the orifice 20b and the through hole 28 are supplied. The air is sequentially supplied to the air inlet c of the dual relay valve 9 via the air outlet b. As a result, low pressure air acts on the second piston 51, and the lower half 4
The crimped state between the receiving surface 62 of No. 9 and the covering member 61 is released. At the same time, high-pressure air from the tank 2 is led to the air outlet f through the air inlet d of the dual relay valve 9, and further led to the bellows 4 through the line 14. As a result, the air pressure inside the bellows 4 increases, and adjustments are made to increase the vehicle height.

Next, regarding the case where the vehicle height becomes higher than a predetermined range, in this case, the rotating lever 46 rotates about the rotating shaft 40 in the direction of arrow D' in FIG. 4. Accordingly, the other pressing portion 42b of the rotating member 41 comes into contact with the pressed rod 36 and presses it. Therefore, the pressure bonding plate 37 is pressed and moved against the biasing force of the compression coil spring, and the through hole 35 of the base body 20 is opened. As a result, the base 2
Since the communication hole 20a of No. 0 communicates with the air discharge port 44 via the through hole 35, the air inlet c of the dual relay valve 9 that communicates with the communication hole 20a becomes atmospheric pressure, and the pressure of the second piston increases. Atmospheric pressure acts on the upper surface of 51. on the other hand,
The air pressure at the air outlet f of this valve 9 is the same as the air pressure inside the bellows 4 and is higher than the atmospheric pressure, so the second piston 51 is connected to the first piston 5.
0 side, and the tip surface 5 of the second piston 51
1b is separated from the covering member 61. At the same time, some high pressure air in bellows 4 is released into line 1.
4. Air outlet f, center hole 54 of lower half 49
b and the hollow part 59a of the cylindrical member 59 in order and are discharged to the outside. As a result, the air pressure inside the bellows 4 is reduced, and adjustments are made to lower the vehicle height.

Next, the operation when a disturbance occurs in the vehicle height will be described.

When disturbances such as rolling, pitching, and nose type occur, the height of the chassis relative to the axle changes. Accordingly, the rotating lever 68 rotates together with the rotating plate 67 about the rotating shaft 65 in the direction of arrow E in FIG. 6. As a result, when the above-mentioned amount of rotation exceeds a certain amount, one of the support members 69
The arcuate protrusion 67a of the rotary plate 67 blocks the space between the light emitting element a or 69b and the light receiving element.
Based on this, the sensor 13 is turned on, for example, and the electromagnetic valve 12 is connected to the sensor 13.
A disturbance detection signal is sent to As a result, the electromagnetic valve 12 is opened, and high pressure air from the tank 2 is supplied to the air inlet e of the dual relay valve 9 via the electromagnetic valve 12.

When high-pressure air is supplied to the air inlet e, the first piston 50 is pressed downward and the second piston 50 is moved downward.
The first piston 50 contacts the piston 51 and
and the second piston 51 are pushed downward against the biasing force of the compression coil spring 57 while being integral with each other. Therefore, the cylindrical member 59 and the covering member 61 are pressed downward by the second piston 51 and moved downward against the biasing force of the compression coil spring 60. As a result, the receiving surface 6 of the lower half 49
2 and the covering member 61 are released, and the air inlet d is released through the center hole 54a of the lower half 49.
and the air outlet f are in communication with each other. Note that this series of operations is performed by the leveling valve 3.
This is forcibly performed by high-pressure air from the tank 2, regardless of the state of air supply from the tank 2 to the dual relay valve 9.

When the above condition occurs, high pressure air from the tank 2 flows through the air inlet d, the central holes 54b and 54a of the lower half 49, the air outlet f and the line 14.
are guided into the bellows 4 through sequentially. As a result, the spring constant of the bellows 4 as an air spring increases, so that disturbances are quickly suppressed.

After that, as soon as the disturbance state is resolved, the disturbance detection signal will no longer be output from the sensor 13.
The solenoid valve 12 is placed under the closed condition. Therefore, the air inlet e of the dual relay valve 9 is at atmospheric pressure. Therefore, from now on, the leveling operation is performed based on the air supplied from the leveling valve 3 as described above.

According to the vehicle leveling device configured in this way, even if a disturbance occurs, it is possible to immediately respond to and suppress the disturbance.

Next, a second embodiment of a vehicle leveling device to which the present invention is applied will be described with reference to FIGS. 8 and 9. In addition, in these figures, Figures 2 to 7
Parts common to those in the figures are given the same reference numerals and their explanations will be omitted.

In this embodiment, as shown in FIG. 8, a double check valve 75 is provided, and the relay valve 9' and the double check valve 75 constitute a relay valve mechanism 80. The double check valve 75 has a pair of air inlets g and h.
A sliding member 76 is disposed between them, and air from air inlets g and h acts on this sliding member 76, respectively. Then, the sliding member 76 is pressed and moved by relatively high-pressure air among the air supplied from the air inlets g and h, and as the sliding member 76 moves, the high-pressure air is selectively transferred to the opening 77 and the through hole 78. The air is guided to the air outlet i through the air outlet i.

Further, the air inlet g is connected to the air outlet b of the leveling valve 3 via a line 8, and the air inlet b is connected to the air outlet f of the relay valve 9' via a line 79. ing. Air from the air outlet i is supplied to the bellows 4 via a line 81.

In this embodiment, the air inlet e of the relay valve 9' is closed, and the high pressure air from the electromagnetic valve 12 is supplied to the air inlet c. Also, sensor 13
Disturbance detection is configured such that it detects only cases lasting longer than a predetermined time, and does not detect transient changes.

Regarding the operation in this case, first, when a change in vehicle height occurs during steady running, low pressure air is supplied from the leveling valve 3 through the line 8 to the air inlet g of the double check valve 75. On the other hand, high pressure air is not supplied from the relay valve 9' to the air inlet h of the double check valve 75, so that the air pressure is maintained at atmospheric pressure. Therefore, the sliding member 7 of the double check valve 75
6 is pressed and moved to the side of the air inlet h by low pressure air from the air inlet g as shown in FIG.
As a result, the low-pressure air is guided to the air outlet i through the opening 77 and the through hole 78, and is supplied to the bellows 4.

On the other hand, if a disturbance occurs in the vehicle for a predetermined period of time or more, high pressure air is supplied from the relay valve 9' to the air inlet h of the double check valve 75. As a result, the high pressure air at the air inlet h has a higher pressure than the low pressure air at the air inlet g, so the sliding member 7
6 is pressed and moved to the side of the air inlet g. Therefore, the high pressure air flows through the opening 77 and through hole 78.
The air is guided to the air outlet i and supplied to the bellows 4 through the air outlet i. Therefore, as in the case of the first embodiment described above, disturbances are quickly suppressed.

According to the vehicle leveling device configured in this way, it is possible to achieve the same effects as in the case of the first embodiment described above, and also to reduce the amount of air consumed in the relay valve 9', which is economical. It will be advantageous. That is, in the case of the first embodiment described above, the pressure inside the bellows 4 increases every time the wheel runs over a stone or the like during driving, and the high-pressure air inside the bellows 4 flows to the air outlet of the relay valve 9'. f flows backwards and is discharged to the outside through the hollow portion 59a of the cylindrical member 59. Therefore, air consumption is relatively large.

Also, in this case, double check valve 75
Since the sliding member 76 is arranged on the side of the air inlet h, only the low pressure air from the leveling valve 3 is supplied to the bellows 4. Therefore, even if the pressure in the bellows 4 becomes temporarily high due to running over a stone or the like, the air in the bellows 4 will not be discharged from the relay valve 9' as in the first embodiment described above. Therefore, the amount of compressed air consumed can be reduced, which is advantageous in terms of economy.

Although the present invention has been described above with reference to embodiments, the present invention is not limited to these embodiments, and various modifications and changes can be made based on the technical idea of the present invention.

For example, the leveling valve 3 in the embodiment,
Relay valve 9, 9' double check valve 75
The configuration and arrangement of the sensor 13 can be changed in various ways.

As described above, the present invention includes a high-pressure air supply source, a leveling valve, a sensor and an on-off valve,
By using a relay valve mechanism and a bellows, we have devised a configuration that allows high-pressure air to be forcibly supplied to the bellows when a disturbance such as rolling, pitching, or nose dive occurs in the vehicle. This structure is designed to increase the spring constant of the air spring. Therefore, if the vehicle leveling device of the present invention is used, when a disturbance occurs, the disturbance can be suppressed quickly and smoothly, improving cornering performance and stabilizing the vehicle posture during braking and acceleration. It is possible to greatly improve driving performance such as performance.

[Brief explanation of the drawing]

FIG. 1 is a block diagram schematically showing the configuration of a conventional vehicle leveling device, and FIGS. 2 to 7 show a first embodiment of a vehicle leveling device to which the present invention is applied. Fig. 2 is a block diagram schematically showing the configuration of the leveling device, Fig. 3 is a plan view schematically showing the arrangement of the leveling device in the vehicle, Fig. 4 is a sectional view of the leveling valve, and Fig. 5 is a dual valve. 6 is a partially cutaway plan view of the disturbance detection sensor; FIG. 7 is a partially cutaway side view of the sensor; FIGS. 8 and 9 are vehicle leveling to which the present invention is applied. 8 is a block diagram schematically showing the structure of the leveling device, and FIG. 9 is a sectional view of a double check valve. 1... Compressor, 2... Air tank, 3
...Leveling valve, 4...Bellows, 6...
Air supply source, 9...relay valve, 9'...relay valve, 12...electromagnetic valve as an opening/closing valve, 13...disturbance detection sensor, 75...double check valve, 80...relay valve mechanism.

Claims (1)

[Claims for Utility Model Registration] (a) A high-pressure air supply source that supplies high-pressure air; (b) High-pressure air is supplied from the high-pressure air supply source, and low-pressure air is supplied and released in an amount corresponding to changes in vehicle height. (c) a sensor that detects a disturbance occurring in the vehicle; and (d) an opening/closing valve that allows high-pressure air from the high-pressure air supply source to pass based on the disturbance detected by the sensor. and (e) supplying low-pressure air from the leveling valve to the bellows when no disturbance is detected by the sensor, while supplying low-pressure air from the opening/closing valve when a disturbance is detected by the sensor. A vehicle leveling device comprising: a relay valve mechanism configured to supply high-pressure air to the bellows; and a relay valve mechanism configured to supply high-pressure air to the bellows.