JPS59202920A - Kneeling device of air suspension car - Google Patents

Abstract

PURPOSE:To reduce the consumption quantity of air and to control generation of a sound at the time of kneeling, by providing a kneeling valve in an air supply duct corresponding to one side bellows. CONSTITUTION:When a kneeling switch 30 is closed, air in the inside of belllows 16 is streamed in a kneeling tank 24 from a discharge opening 20a opened at this time through a kneeling valve 20 by closing the kneeling valve 20 and a cut valve 22. As all of the air in the inside of the bellows 16 is not discharged always and a part of the same is remained within the bellows, the title device can be done with a little consumption quantity of the air. As a solenoid valve 38 is closed when a switch 30 is opened, the kneeling valve 20 and a cut valve 32 are opened and air is supplied to the bellows from an air tank 12 until the car reaches to a predetermined car height value established by a levelling valve 22.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a kneeling device for an air suspension vehicle having left and right bellows for supplying air at a predetermined pressure between a wheel such as a large-sized wheel and a frame.

Air suspension vehicles are equipped with a leveling valve provided between an air tank and left and right bellows, and when the vehicle height becomes lower than a predetermined value, the leveling valve opens to maintain the predetermined vehicle height. On the other hand, it is convenient for Pass passengers to get on and off the vehicle if the entrance is as low as 9. Therefore, it is required to lower the vehicle height at least on the side with the entrance. In order to lower the vehicle height, it is preferable to remove air from the bellows and perform kneeling, but in this case, removing all the air from the bellows increases air consumption. An object of the present invention is to provide a kneeling device for an air suspension vehicle that reduces the amount of air consumed during kneeling and suppresses the generation of a single sound.

Embodiments of the present invention will be described in detail with reference to the drawings. One drawing shows a kneeling device 10 for an air suspension vehicle according to the present invention, and the air suspension vehicle has an air tank 12.
It is provided with left and right bellows 16 to which air is supplied from through a leveling valve 14, and only one bellows is shown in Figure 9.

The kneeling device 10 includes at least one bellows 16
a kneeling valve 20 provided in the air supply passage 18 corresponding to the above, a cut valve 22 provided between the air tank 12 and the leveling valve 14, and a kneeling tank 2 connected to the outlet 20a of the kneeling valve 20.
It consists of 4. The kneeling valve 20 and the cut valve 22 are closed after being supplied with control air.The kneeling control means 26 includes a direct current power supply 28, a kneeling switch 30, and a closing state of the kneeling switch 30. When the solenoid valve 32 is opened, the solenoid valve 32 supplies control air from the air tank 12 to the kneeling valve 14 and the cut valve 22 during kneeling. The cut valve 22 is closed. The kneeling beak 20 connects the air supply passage 1 between the leveling valve 14 and the bellows 16.
When bellows 8 is closed, the discharge port 20a is opened, so bellows 1
Air in the bellows 16 is discharged from the bellows 16 through this discharge port 20a.

' The air exhaust means 36 consists of a solenoid valve 38 which is connected to the kneeling tank 24 and is opened by opening the kneeling switch 30. Therefore, when the kneeling switch 30 is closed to end the kneeling, the solenoid valve 38 is opened and the kneeling tank 30 is opened. The air in 24 flows through this solenoid valve 38.
is discharged through.

Next, to explain the operation of the kneeling device of the present invention, during normal running of an air suspension vehicle, the kneeling switch 30 is open, so the solenoid valve 32 is closed, and the kneeling valve 20 and the force y) are opened. ing.

For this reason.

The bellows 16 is maintained at a predetermined vehicle height set by the leveling valve 14. When the vehicle arrives at a stop, when the kneeling switch 30 is closed, the kneeling valve 20 and the cut valve 22 are closed as described above, and the air inside the bellows 16 is discharged to the kneeling valve 20.
It flows into the kneeling tank 24 through the discharge port 20a, which is open at this time. If the capacity when the bellows 16 maintains a predetermined vehicle height is VO, and the capacity when the vehicle height is convenient for getting on and off is Vl, then the product of air pressure P and capacity is constant, so the kneeling tank 24 Capacity v2
It can be seen that it is sufficient to set V2=VO−Vl. In this way, all of the air within the bellows 16 is not exhausted and a portion of it remains within the bellows, so that the amount of air consumed can be reduced. In this way, the height of the vehicle can be lowered to allow passengers to get on and off the vehicle safely. When the kneeling switch 30 is opened before the vehicle departs,
Since the electromagnetic valve 32 is closed, the kneeling valve 20 and the cut valve 32 are opened, and air is supplied from the air tank 12 to the bellows 16 until a predetermined vehicle height set by the leveling valve 22 is reached. On the other hand, at this time, the solenoid valve 38 opens, so the air in the knee link tank 24 is drained from the solenoid valve 38.
υ1 is issued through 8. By keeping the opening degree of the electromagnetic valve 38 small, it is possible to suppress the generation of sound when air is extracted from the kneeling valve 14.

According to the present invention, as described in 1-, the amount of air consumed during kneeling of heavy vehicles can be small, so it is economical;
The time it takes to return to a predetermined vehicle height can be shortened by tIi, and the generation of noise can also be suppressed, which is a practical benefit.

[Brief explanation of drawings]

14 is a schematic system diagram of a kneeling device for an air suspension vehicle according to the present invention. 10-----Two-ring device, 12-engine suspension weight, 14--1--Leveling valve, 16--
---Heroes, 18---Air supply passage, 20-
--- 121 ring pulp, 20 a ----- 1 discharge hole, 22 ----- Cut valve, 24 --- 12-link tank, 26 --- 2-ring control means ,
30-1-----2-ring switch, 36-------
Air supply means, 38 - - one solenoid valve.

Claims (3)

[Claims] (1) In an air suspension equipped with left and right bellows to which air is supplied from an air tank via a leveling valve, a kneeling valve provided in an air supply passage corresponding to at least one bellows, and a kneeling valve provided in an air supply passage corresponding to at least one of the bellows; a cut valve provided between a tank and a leveling valve; a kneeling tank connected to an outlet of the kneeling valve; a kneeling control means for closing the kneeling valve and the cut valve during kneeling; an air exhaust means for exhausting air from a kneeling tank, said kneeling valve communicating its outlet with said force bellows when said air supply passage is closed. (2) The opening and closing of the kneeling valve and the cut valve (■) are controlled by control air, and the kneeling control means includes a kneeling switch, and by closing the kneeling switch, the knee link valve and the cut valve are connected from the air tank to the knee link valve and the cut valve. The kneeling device for an air suspension vehicle according to claim 1, comprising a solenoid valve for supplying the control air. (3) The air supply means is connected to the kneeling tank and the kneeling switch is opened. A kneeling device for an air suspension vehicle as claimed in claim 2, comprising a solenoid valve opened by a solenoid valve.