JPH0319450Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tilt angle reducing device for an air suspension vehicle, and more particularly to a tilt angle reducing device for a vehicle in which an axle is suspended from a vehicle body via a pair of left and right air springs.

In vehicles such as buses, air springs with a small spring constant are used as suspension springs to improve ride comfort. Such air suspension devices suspend the axle from the vehicle body via a pair of left and right air springs, and generally the pair of left and right air springs on the front wheels are suspended via a common leveling valve. The vehicle height is maintained at a nearly constant value by supplying air to the air spring or discharging air from the air spring using this leveling valve.

Since the leveling valve has only a single outlet port, the left and right air springs are communicated with each other on the air spring side of the leveling valve. Therefore, the air in the air spring with the larger load is
The air flows to the air spring on the opposite side, thereby tilting the vehicle body.

The present invention was developed in view of the above circumstances, and the object is to provide a device that reduces the angle of inclination without impairing the original function of the air suspension device. It is.

The tilt angle reduction device for an air suspension vehicle of the present invention is a device in which an axle is suspended from a vehicle body via a pair of left and right air springs, and each of the pair of air springs is connected to a leveling valve via a switching valve. When the vehicle body is in a steady state, the pair of air springs are communicated with the leveling valve, and when the vehicle body tilts to the left or right, an operating device opens the switching valve on the opposite side of the tilt direction to discharge air from the corresponding air spring. It is characterized by having the following.

The present invention will be explained below with reference to examples. First of all
To explain this embodiment with reference to FIG. 1, an axle 2 to which wheels 1 are attached on the left and right sides is suspended on a frame 6 that constitutes the frame of a vehicle body 5 via a pair of left and right air springs 3 and 4. . The pair of air springs 3 and 4 are connected to a leveling valve 9 via air pipes 7 and 8, respectively. The inlet port of the leveling valve 9 is connected to an air tank (not shown). The leveling valve 9 also includes a control lever 10, the tip of which is connected to the axle 2 via a link 11.

Further, this air suspension device includes switching valves 1 on air pipes 7 and 8 that connect the air springs 3 and 4 to the leveling valve 9, respectively.
It is equipped with 2,13. These switching valves 12,
Reference numeral 13 consists of a three-way valve and is electrically switchable. Further, the first ports of these switching valves 12 and 13 are connected to the leveling valve 9,
The second port is connected to the air springs 3 and 4, and the third port is connected to the vacuum tank 14. This vacuum tank 14 is connected to a vacuum pump 15.
In addition, sensor 1 detects the height Hr of the air spring 4 on the right side, and the height Hr of the air spring 3 on the left side.
CPU 1 connected to sensor 17 that detects Hl
8 are connected to the switching valves 12 and 13 via actuators 19 and 20.

In the above configuration, the air pipes 7, 8
The switching valves 12 and 13 provided respectively in the air springs 3 and 4 and the leveling valve 9 normally
are switched so that they communicate with each other. Therefore, the vehicle height is adjusted by the leveling valve 9. For example, when the load applied to the vehicle body increases, the control lever 10 is rotated upward to open the leveling valve 9, and the left and right air springs 3,
4 is supplied with compressed air, and the vehicle body 5 is prevented from descending. Further, when the load applied to the vehicle body 5 decreases, the control lever 10 is rotated downward in the opposite direction, and the exhaust port of the leveling valve 9 is opened. Therefore, the compressed air in the air springs 3, 4 will be exhausted to the atmosphere through the exhaust port of the valve 9.

Next, the operation of reducing the inclination angle of this air suspension device will be explained. For example, when a vehicle is stopped on an inclined road surface as shown in FIG. 1, a large load is applied to the left air spring 3, whereas a small load is applied to the right air spring 4. Therefore, the air in the air spring 3 whose internal pressure has increased flows toward the air spring 4 through the air pipes 7 and 8, and the vehicle body tends to tilt further to the left. However, at this time, the height of the air spring 4 on the right side
From Hr and the height Hl of the left air spring 3,
The CPU 18 detects that the vehicle body 5 is tilted significantly, and the actuator 19 switches the switching valve 13 provided on the air spring 4 in the direction opposite to the tilt direction, so that the air spring 4 communicates with the vacuum tank 14. At the same time, communication between the left and right air springs 3 and 4 is cut off.

Therefore, the compressed air in the left air spring 3 is maintained as it is, whereas the air in the right air spring 4 suddenly flows into the vacuum tank 14. Furthermore, the air in this tank 14 will be discharged into the atmosphere by a vacuum pump 15. Furthermore, this operation reduces the distance between the leveling valve 9 and the axle 2, so the valve 9 is opened, compressed air is supplied into the air spring 3, and the left side of the vehicle body 5 is lifted. Therefore, the vehicle body 5 is rotated in a direction that reduces its angle of inclination, that is, to the right, as shown by the chain line in FIG. 1, thereby reducing its angle of inclination.

In this way, according to the air suspension vehicle of this embodiment, when the vehicle body 5 tilts to the left or right, the switching valve 12 or 13 of the air spring 3 or 4 on the opposite side to the direction of overturning is opened. Therefore, air is discharged from the corresponding air spring 3 or 4, and the vehicle body 5 is rotated in the opposite direction to the tilting direction. Therefore, with such a configuration, the angle of inclination can be reduced.
Note that the switching of the switching valves 12 and 13 is performed by the vehicle body 5.
The switching valves 12 and 13 are automatically operated in conjunction with the left and right tilt of the switching valves 12 and 13.
It is also possible to switch between them.

Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, parts corresponding to those in the first embodiment shown in FIG. 1 are given the same reference numerals, and explanations of parts having the same configuration will be omitted. A feature of this second embodiment is that the vacuum tank 14 and vacuum pop 15 in the first embodiment are removed. Further, the switching operation of the switching valves 12 and 13 is performed by a switch 25.

Therefore, according to this embodiment, when the vehicle body 5 leans to the left as shown in FIG. It will be communicated with No. 13 exhaust port. Therefore, in this case, the compressed air in the air spring 4 is transferred to the switching valve 1.
3 will be released into the atmosphere. As mentioned above, since the vacuum tank 14 is not provided, the air inside the air spring 4 does not fall below atmospheric pressure, but compressed air is released until the pressure reaches atmospheric pressure. car body 5
is rotated to the right, so the angle of inclination is reduced.

Furthermore, when the switching valve 13 is switched, the communication between the left and right air springs 3 and 4 is cut off, and the air in the air spring 4 is discharged, lowering the vehicle height. When opened, compressed air is supplied into the air spring 3. Therefore, this causes the vehicle body 5 to further rotate to the right, and the inclination angle of the vehicle is reduced. Therefore, this embodiment also provides substantially the same effects as the first embodiment.

As described above, the present invention connects a pair of left and right air springs for suspending an axle to a leveling valve through respective switching valves, and in a steady state of the vehicle body, the pair of air springs are communicated with the leveling valve, When the air spring tilts from side to side, the switching valve on the opposite side to the direction of inclination is opened to discharge air from the corresponding air spring. Therefore, according to the present invention, by discharging the air described above, it is possible to rotate the vehicle body in the opposite direction to the tilt direction, thereby reducing the tilt angle of the air suspension vehicle. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a front view of an air suspension vehicle according to a first embodiment of the present invention, and FIG. 2 is a front view of an air suspension vehicle according to a second embodiment of the present invention. In addition, in the symbols used in the drawings, 2...axle,
3, 4...Air spring, 5...Car body, 9...
Leveling valves 12, 13... switching valves.

Claims (1)

[Scope of utility model registration request] In a device in which an axle is suspended from a vehicle body via a pair of left and right air springs, each of the pair of air springs is connected to a leveling valve via a switching valve, and when the vehicle body is in a steady state, the pair of air springs is leveled. Tilt of an air suspension vehicle characterized by being provided with an operating device that communicates with a valve and opens a switching valve on the opposite side of the tilting direction when the vehicle body tilts to the left or right to discharge air from a corresponding air spring. Angular reduction device.