JP2583335Y2 - Height adjustment device - Google Patents

Description

[Detailed description of the invention]

[0001]

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

[0002]

2. Description of the Related Art A conventional vehicle height adjusting device is disclosed, for example, in Japanese Utility Model Laid-Open No. 60-171721. The adjustment of the vehicle height by the vehicle height adjustment device provided with the air spring is performed as follows.

As shown in FIG. 2, an air spring 1 supporting an axle is connected to an air tank 4 via an exhaust valve 2 and a leveling valve 3, and while the leveling valve 3 is open, air is supplied to the air spring. 1 grows.

On the other hand, when the pilot pressure is applied to the exhaust valve 2 by operating the magnetic valve 5 such as when lowering the vehicle height, the exhaust valve 2 is switched to the atmosphere release side, and the air of the air spring 1 is discharged. , Lower the vehicle height.

[0005]

When the vehicle height is adjusted, air can freely flow into and out of the air chamber 6 connected to the air spring 1. For example, when the vehicle height is lowered, the air in the air chamber 6 is also adjusted by the air spring. And they are discharged together via 1. Therefore, it takes extra time to shrink the air spring 1 by a predetermined amount. When the air in the air chamber 6 is discharged,
The next time you raise the vehicle, you need to make up for this emission,
A large amount of air is required, which not only takes a long time, but when the height adjustment is frequently used, the load on the air compressor also increases, which affects the fuel efficiency of the vehicle.

The present invention aims to solve such a problem.

[0007]

SUMMARY OF THE INVENTION The present invention provides an air circuit for introducing compressed air from an air tank into an air spring.
A leveling valve that opens and closes an air circuit in response to a vehicle height adjustment signal, and a three-way switching exhaust valve interposed on the downstream side of the leveling valve, the leveling valve and the exhaust valve
Place the air chamber between the atmospheric air springs
And a magnetic valve for switching an exhaust valve so as to open or communicate with the air chamber .

[0008]

In the normal state, compressed air is introduced into the air spring via a leveling valve and an air chamber. The air chamber maintains communication with the air spring and exhibits a predetermined air spring function.

When the vehicle height is adjusted, for example, when the vehicle height is lowered, when the exhaust valve is switched to the atmosphere release side via a magnetic valve, only the air from the air spring is released to the atmosphere and the air from the air chamber does not escape. . For this reason,
When the vehicle height adjustment time is short and the vehicle height is increased, air is sent to the air spring via the air chamber, but the air chamber is filled with air of a predetermined pressure, so that the air is supplied. Air is consumed exclusively to extend the air spring.

[0010]

FIG. 1 shows an embodiment of the present invention. An air spring 1 is connected to an air chamber 6 via an exhaust valve 2. The air chamber 6 has a leveling valve 3
Are connected to send air from the air tank 4 according to the vehicle height. The air chamber 6 is kept in communication with the air spring 1 via the exhaust valve 2 in a normal state, and air can freely flow in and out when traveling.

When the pilot pressure is supplied from the magnetic valve 5, the exhaust valve 2 is switched to release the air of the air spring 1 to the atmosphere. However, at this time, the air from the air chamber 6 is not discharged. That is, the exhaust valve 2 is configured as a three-way switching valve.

The leveling valve 3 switches according to the operation of each of the magnetic valves 7, 8, 9 by the operator .
Air from the air tank 4 is selectively sent to the air spring 1 via the air chamber 6 so as to maintain the specified level.

In the normal state, the air spring 1 and the air chamber 6 maintain communication with each other through the exhaust valve 2, and communicate with the air chamber 6 as the air spring 1 expands and contracts. The air freely moves between them, and exhibits a predetermined spring function.

On the other hand, when lowering the vehicle height, the exhaust valve 2 is switched to the atmosphere release side via the magnetic valve 5, the air spring 1 is released to the atmosphere, and the air spring 1 contracts to lower the vehicle height. However, since the air in the air chamber 6 is not released, the vehicle height can be reduced by a predetermined amount in a short time. Further, since only the air spring 1 is exhausted and the air pressure in the air chamber 6 is maintained, the amount of wasteful air consumption is reduced, and the load on the air compressor that replenishes the air tank 4 with air is also reduced.

Conversely, when raising the vehicle height, the air from the air tank 4 is opened by opening the leveling valve 3, passes through the air chamber 6, the exhaust valve 2, and the air spring 1.
Sent to. In this case, since the air chamber 6 is maintained at a predetermined pressure in advance, it is only necessary to supply air necessary for extending the air spring 1 exclusively.
The vehicle height can be raised in that short time.

[0016]

As described above, according to the present invention, an air circuit for introducing compressed air from an air tank to an air spring, a leveling valve for opening and closing the air circuit in response to a vehicle height adjustment signal, A three-way switching exhaust valve is interposed downstream of the leveling valve, and the leveling valve and the exhaust valve are connected.
Air chamber between the valve and the air spring.
Since it equipped with a magnetic valve for switching the exhaust valve so as to communicate with the release or air chamber to atmosphere, e
When the aspring and air chamber are in communication,
That they can work together as an air spring
Even if you operate the exhaust valve when lowering the vehicle height,
The air in the air chamber is not released. Also a car
Leveling air from the air tank to raise the height
Opening the air valve, the air
Before sending it to the air spring.
Air at a predetermined pressure is stored in the chamber.
Necessary air can be supplied in a short time. Soshi
Since only the air from the air spring is released to the outside when the vehicle height is lowered, the effect of not only shortening the time required for adjusting the vehicle height but also reducing the air consumption can be obtained.

[Brief description of the drawings]

FIG. 1 is a pneumatic circuit diagram showing an embodiment of the present invention.

FIG. 2 is a pneumatic circuit diagram of a conventional vehicle height adjusting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air spring 2 Exhaust valve 3 Leveling valve 4 Air tank 5 Magnetic valve 6 Air chamber

Claims (1)

(57) [Scope of request for utility model registration] 1. A compressed air from the air tank to the air circuit to be introduced into the air spring, the air times depending on the vehicle height signals
Leveling valve to open and close the road and this leveling valve
Interposed an exhaust valve of the three-way switch to blanking downstream, the Reberi
An air chamber is located between the cooling valve and the exhaust valve.
And release the air spring to atmosphere or to the air chamber.
A vehicle height adjusting device comprising a magnetic valve that switches an exhaust valve so as to communicate with each other .