JP2571525Y2 - Kneading device for vehicles with air suspension - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a vehicle equipped with an air suspension device. More particularly, the present invention relates to a kneeling device for lowering the height of a truck, a bus, or the like by using an air suspension device.

[Related Art] A vehicle air suspension device supplies compressed air from an air tank of a vehicle via a leveling valve to an air spring irrespective of a change in load, and the leveling valve keeps the height constant. . The kneeling device is provided in the air suspension device and discharges the compressed air in the air spring to lower the vehicle height. In order to make it easier for passengers to get on and off in buses, etc., in trucks, etc., in order to make it easier to load and unload goods, or to put vehicles in garages with low roofs, this kneeling device lowers the vehicle height. .

However, if the compressed air in the air spring is discharged until the air pressure becomes equal to the atmospheric pressure, it takes a lot of time to restore the vehicle height, and a lot of compressed air is required. There was a point.

In order to solve this problem, the present applicant has proposed a kneeling device for an air suspension vehicle that reduces the consumption of compressed air during kneeling (Japanese Patent Laid-Open No. 59-202920). In this device, a cut valve is provided between an air tank and a leveling valve, a switching valve is provided between the leveling valve and the air spring, and a kneeling tank is connected to a discharge port of the switching valve. At the time of kneeling for reducing the vehicle height, the cut valve is closed by the kneeling control means, and the switching valve is switched so that the air spring communicates with the kneeling tank. As a result, the compressed air in the air spring is not entirely discharged, but is discharged to the kneeling tank by the amount of the compressed air, thereby lowering the vehicle height. When restoring the vehicle height, the cut valve is opened, the air spring and the kneeling tank are shut off, and compressed air is supplied from the air tank to the air spring by an amount discharged to the kneeling tank. At this time, the compressed air stored in the kneeling tank is discharged by air discharging means.

[Problem to be Solved by the Invention] However, since the above-mentioned kneeling device has a kneeling tank, there is a problem that an installation space for the kneeling device must be secured.

SUMMARY OF THE INVENTION An object of the present invention is to provide a kneeling device for a vehicle with an air suspension, which can shorten a restoring time from the time of kneeling with a slight increase in mounting space and can reduce a consumption of compressed air. is there.

[Means for Solving the Problems] The configuration of the present invention for achieving the above object will be described with reference to FIG. 1 corresponding to the embodiment. The present invention relates to an air spring 16 for supplying compressed air from an air tank 11 through a bearing valve 13 to suspend a vehicle body, and a bearing valve provided between the air tank 16 and the leveling valve 13.
An air pressure control type cut valve 12 that switches between the supply of compressed air to 13 and the stop of this supply by the supply and discharge of compressed air to the control unit 12c, and an air spring 16 provided between the air spring 16 and the leveling valve 13. The invention is an improvement of a kneeling device for a vehicle with an air suspension, including a switching valve 14 of an air pressure control type that switches between supply and discharge of compressed air to and from a controller 14d by supply and discharge of compressed air to a controller 14d.

The characteristic configuration is the discharge port 14c of the switching valve 14.
Is connected to a pressure regulating valve 24 for maintaining a predetermined air pressure lower than the air pressure when the air spring 16 is suspended in the vehicle body.

[Operation] When the vehicle height is lowered, the switching valve communicates the air spring and the pressure regulating valve to discharge a part of the compressed air in the air spring, and the pressure regulating valve reduces the air pressure of the air spring when the vehicle body is suspended. Maintain a predetermined air pressure lower than the air pressure. When restoring the vehicle height, the switching valve communicates the air tank with the air spring via the leveling valve, and supplies compressed air from the pressure maintained by the pressure regulating valve to a predetermined pressure to the air spring.

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, a compressed air source 11 is mounted on the truck, and an air spring is supplied from the compressed air source 11 through a cut valve 12, a leveling valve 13, and a switching valve 14.
16 is supplied with compressed air. The air spring 16 has a plate 16a fixed to a chassis frame 17, a base 16b attached to an axle 18 via a bracket 19, and a rubber film 16c formed in a cylindrical shape. The rubber film 16c is connected between the plate 16a and the base 16b, and the inside thereof is supplied with compressed air. A contact rubber 21 made of rubber is fixed to the upper surface of the base 16b, and the plate 16a comes into contact with the top of the rubber 21 when the compressed air in the air spring 16 is discharged. The air spring 16 is configured to absorb the vibration generated by the unevenness of the road surface during the running of the truck by the elasticity of the compressed air stored inside the air spring 16 so as not to be transmitted to the chassis frame 17.

The cut valve 12 is a two-port two-position switching air pressure control type valve. The port 12 a is connected to the compressed air source 11, and the port 12 b is connected to the leveling valve 13. When compressed air is supplied to the control unit 12c of this valve 12, port 1
The port 2a and the port 12b are shut off, and when the compressed air is discharged from the control unit 12c, the port 12a and the port 12b communicate with each other. The leveling valve 13 is a three-port three-position switching valve. The port 13a is connected to the cut valve 12, the port 13b is connected to the switching valve 14, and the discharge port 1
3c communicates with the atmosphere. This valve 13 is a chassis frame 17
The base end of a lever 13d is pivotally connected to the valve 13. The tip of the lever 13d is connected to the bracket 19 via the link 13e.
Attached to When the lever 13d is horizontal as shown by the solid line, the port 13a and the port 13b are shut off, and when the lever 13d is upward as shown by the two-dot chain line, the port 1a is closed.
The configuration is such that the port 13b communicates with the discharge port 13c when the lever 3d is directed downward as shown by a broken line, with the port 3b communicating with the port 13b.

The switching valve 14 is a three-port two-position switching air pressure control type valve. The pogo 14a is connected to the leveling valve 13, the port 14b is connected to the air spring 16, and the discharge port 14c is connected to a pressure regulating valve 24 described later. Is connected.
When compressed air is supplied to the control unit 14d of the valve 14, the port 14b communicates with the discharge port 14c, and the compressed air is supplied to the control unit 14d.
The port 14a and the port 14b are configured to communicate with each other when discharged from the port 14d. An electromagnetic valve 22 is attached to the compressed air application 11 and is a three-port two-position switching electromagnetically controlled valve. The port 22a is connected to the compressed air source 11, the port 22b is connected to the control unit 12c of the cut valve 12, and the control unit 14d of the switching valve 14, and the discharge port 22c communicates with the atmosphere. This electromagnetic valve 22 is turned on and off by a manual switch 23 provided in the passenger compartment.
When the switch 23 is closed, the port 22a communicates with the port 22b, and when the switch 23 is opened, the port 22b communicates with the discharge port 22c. When the port 14b of the switching valve 14 and the discharge port 14c communicate with each other, the pressure regulating valve 24 is configured to maintain the air pressure of the air spring 16 at a predetermined pressure lower than the air pressure when the vehicle body is suspended. In this example, when the truck is empty with no luggage
The air pressure of the air spring 16 during suspension is 2.5 kg / cm ² , and the pressure regulating valve 24 maintains the air pressure at 2.0 kg / cm ² .

The operation of the kneeling device for a vehicle with an air suspension thus configured will be described.

The driver closes the manual switch 23 when lowering the vehicle height, for example, in order for a truck to load luggage. When the electromagnetic valve 22 is turned on, the port 22a communicates with the port 22b, and the compressed air is sent to the control unit 12c of the cut valve 12 and the control unit 14d of the switching valve 14. In the cut valve 12, the port 12a and the port 12b are shut off, and in the switching valve 14, the port 14b communicates with the discharge port 14c. The compressed air in the air spring 16 is discharged to the atmosphere from the discharge port 24a via the switching valve 14 and the pressure regulating valve 24, and the plate 16a contacts the top of the contact rubber 21. At this time, the air pressure in the air spring 16 is 2.5 kg / cm ² , and since the set pressure of the pressure adjusting valve 24 is 2.0 kg / cm ² , the air pressure from the pressure adjusting valve 24 is 2.0 kg / cm 2. The compressed air in the air spring 16 is discharged until the pressure becomes ² . When the pressure in the air spring 16 becomes 2.0 kg / cm ² , the pressure regulating valve 24 stops discharging the compressed air.

The load is loaded on the truck bed, and the driver opens the manual switch 23 to restore the vehicle height. The electromagnetic valve 22 is turned off and communicates with the port 22b and the discharge port 22c,
The control unit 12c of the cut halve 12 and the control unit 1 of the switching valve 14
Discharge compressed air from 4d. Port 12 of cut valve 12
a and the port 12b communicate with each other, and the port 14a and the port 14b of the switching valve 14 communicate with each other. The compressed air from the compressed air source 11 is supplied to the air spring 16, and the air spring 16 raises the chassis frame 17 to a predetermined height.

In this way, the compressed air in the air spring 16 is minimized without being discharged until the air pressure becomes equal to the atmospheric pressure, so that the consumption of the compressed air when restoring the vehicle height is reduced, and Chassis frame 17 to a specified vehicle height in a short time
Can be raised.

In the embodiment, a truck is used as a vehicle. However, this is an example, and a bus or other vehicle may be used as long as the vehicle is suspended by an air spring.

Further, the values of the pressure of the compressed air in the air spring and the set pressure of the pressure regulating valve shown in the embodiment are merely examples, and the present invention is not limited to these.

[Effects of the Invention] As described above, according to the present invention, when the vehicle height is lowered, the supply of the compressed air to the leveling valve is stopped by the cut valve, and the air spring and the pressure regulating valve are switched by the switching valve. It communicates and discharges a part of the compressed air in the air spring.At this time, the pressure regulating valve keeps the air pressure of the air spring at a predetermined air pressure lower than the air pressure when the vehicle is suspended. The recovery time is short and the consumption of compressed air is reduced. Also, when restoring the vehicle height, the switching valve communicates the air tank with the air spring via the leveling valve, so the air spring suspends the vehicle body, and vibrations are not transmitted to the vehicle body absorbed by the air spring due to unevenness of the road surface .

Particularly, since the pressure regulating valve is provided instead of the conventional kneeling tank, there is an advantage that the mounting space is small.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a kneeling device of a vehicle with an air suspension according to one embodiment of the present invention. 11: compressed air source (air tank), 12: cut valve, 12c:
Control unit of cut valve, 13: leveling valve, 14: switching valve, 14c: discharge port of switching valve, 14d: control unit of switching valve, 16: air spring, 24: pressure regulating valve.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60G 17/015 B60G 17/056 F-term

Claims (1)

(57) [Scope of request for utility model registration] A compressed air is supplied from an air tank (11) via a leveling valve (13) and an air spring (16) for suspending the vehicle body is provided between the air tank (16) and the leveling valve (13). An air pressure control type cut valve (12) that switches between supplying compressed air to the leveling valve (13) and stopping the supply by supplying and discharging compressed air to a control unit (12c); 1
An air pressure control type switching valve which is provided between the leveling valve (6) and the leveling valve (13) and switches supply and discharge of compressed air to the air spring (16) by supply and discharge of compressed air to the control unit (14d). (14) a kneeling device for a vehicle with an air suspension, the discharge port (14c) of the switching valve (14) being maintained at a predetermined air pressure lower than the air pressure of the air spring (16) when the vehicle is suspended. A kneeling device for a vehicle with an air suspension, wherein a pressure regulating valve (24) is connected.