JPS6340007Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a device for ensuring safety during kneeling of an air suspension vehicle, such as a large bus, which has left and right bellows that supply air at a predetermined pressure between the wheels and the frame. It is.

Air suspension vehicles are equipped with a leveling valve installed between the air tank and the left and right bellows, and when the vehicle height falls below a predetermined value, this leveling valve opens to maintain the predetermined vehicle height. . On the other hand, when passengers get on and off the bus, it is convenient for passengers to get on and off the bus if the entrance is low. Therefore, it is required to lower the vehicle height at least on the side having the entrance. In order to lower the vehicle height, a kneeling device has been proposed that closes a kneeling switch and bleeds air from the bellows for kneeling. The original purpose of this type of kneeling device is to allow passengers to go up and down easily, so the kneeling device is finished before the door is opened to raise and lower the passenger, and after the passenger has finished raising and lowering the door and the door is closed. The most practical way is to return the vehicle height to a predetermined height from the kneeling position and enter the driving position.

An object of the present invention is to provide a kneeling safety device for an air suspension vehicle in which kneeling is linked to opening and closing of a door so that kneeling can be activated and released in a practical manner.

An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a kneeling safety device 10 for an air suspension vehicle according to the present invention, and an air suspension vehicle 12 is connected to an air tank (not shown) from an air tank (not shown). A kneeling device 14 is provided for removing air from at least one of the left and right bellows for air suspension, which has an entrance/exit, to which air is supplied through a leveling valve that does not provide air. In this kneeling device 14, only a solenoid valve 16 for kneeling is shown in the drawing, and when this solenoid valve 16 is opened, control air is supplied to a not-shown kneeling valve, thereby cutting off one bellows from the air supply source and The air inside the bellows is discharged and the step of the entrance/exit is lowered.

The kneeling/door switch 18 is provided between the battery power supply 20 and the solenoid valve 16. Therefore, when the kneeling/door switch 18 is turned to the first contact 18a on the right side in FIG. 1, that is, to the front in FIGS. 2 and 3, , the electromagnetic valve 16 is energized to start kneeling, and when the kneeling/door switch 18 is returned to the center of FIG. 1, the electromagnetic valve 16 is deenergized and the kneeling is canceled.

A door operating circuit 21 that operates a door engine (not shown) for opening and closing a vehicle door is a solenoid valve 1.
Kneeling detection switch 2 provided in parallel with 6
2 to the first contact 18a of the kneeling/door switch 18, and an interlock operating circuit 24 that operates an accelerator interlock solenoid valve (not shown) is directly connected to the first contact 18a of the kneeling/door switch 18. It is connected to the.

Second contact point 18 of kneeling/door switch 18
b is directly connected to the door operating circuit 21 and the interlock operating circuit 24. This second contact 18
b is used to open and close the door without a kneeling motion.

In FIG. 1, numerals 26, 28, 30 and 32 are diodes for preventing backflow.

The relay 34 is connected in series to the battery power supply 20 and the door stop switch 36, and its relay contact 34a is connected in parallel to the kneeling/door switch 18 between the battery power supply 20 and the solenoid valve 16.

Next, to explain the operation of the kneeling safety device of the present invention, during normal running of an air suspension vehicle, the kneeling/door switch 18 is located in the center of FIGS. 2 and 3 and is open, so that the kneeling device 14 is in operation. I haven't and the door is closed again. On the other hand, when the vehicle arrives at a stop, when the kneeling/door switch 18 is turned to the first contact 18a side, the solenoid valve 16 of the kneeling device 14 is energized to start kneeling, and the diode 26,
30, the interlock activation circuit 24 is activated to interlock the accelerator. However, since the kneeling detection switch 22 is still open at this time, the door operating circuit 21 is not yet driven. When the kneeling is completed and the kneeling detection switch 22 is closed, the door operating circuit 21 is driven through the diode 28 to operate the door engine and open the door. At this time, since the door stop switch 36 is closed, the relay 34 is energized and the relay contact 34 is energized.
a is closed, and the kneeling device 14 is driven from both the kneeling/door switch 18 and the relay contact 34a. Next, kneeling and door switch 1
When the kneeling device 8a is returned to its original neutral position (the solid line position in FIGS. 2 and 3), the door operating circuit 21 is disconnected from the power supply and the door is closed, but the kneeling device 14
and interlock activation circuit 24 are relay contacts 3
It remains activated through 4a. When the door is completely closed, the door stop switch 36 opens and the relay contact 34a opens, disconnecting the kneeling device 14 and the interlock operating circuit 24 from the power supply, releasing the kneeling and releasing the accelerator interlock. If you want to open/close the door regardless of kneeling, use kneeling/door switch 1.
8 to the second contact 18b side.

According to the present invention, as described above, the door does not open before the vehicle kneels, and the kneeling does not release before the door closes, so it is possible to provide desirable conditions for passengers to ascend and descend. .

[Brief explanation of the drawing]

FIG. 1 is a schematic system diagram of a kneeling safety device according to the present invention, and FIGS. 2 and 3 are a perspective view and a top view of a kneeling and door switch. 10... Kneeling safety device, 12... Air suspension vehicle, 14... Kneeling device, 18
...Kneeling and door switch, 18a...1st
Contact, 21... Door operating circuit, 22... Kneeling detection switch, 34... Relay, 34a... Relay contact, 36... Door stop switch.

Claims (1)

[Scope of utility model registration request] In an air suspension vehicle equipped with a kneeling device that can lower the vehicle height at least on the entrance/exit side by closing a kneeling switch when the air suspension vehicle is stopped, the kneeling switch is also used as a door switch. ,
The kneeling/door switch is connected to the door operating circuit via a kneeling detection switch that closes upon completion of kneeling, and includes a relay connected in series to the door stopper switch, and the contacts of the relay are connected in parallel to the kneeling/door switch. A kneeling safety device for air suspension vehicles characterized by: