JPH0535408U - Air suspension car crouching device - Google Patents

Abstract

(57) [Summary] [Purpose] To restore the vehicle height when it becomes impossible to restore the vehicle height due to a trouble in the electric system or a failure of the electromagnetic valve. [Composition] Compressed air source 11 to leveling valve 13
And an air spring 16 for suspending the chassis frame 17 to which compressed air is supplied via a valve, and a switching lever for the valve 13 which is rotatably provided on the valve 13 and switches supply and discharge of compressed air to and from the air spring in accordance with a rotation angle. 13d, an air cylinder 14 provided between the axle 18 and the switching lever to rotate the switching lever by the relative displacement of the chassis frame and the axle or to expand and contract by the supply and discharge of compressed air to rotate the switching lever. An electromagnetic valve 22 for reducing the air cylinder by supplying compressed air to the air cylinder by an electric signal. An emergency restoration valve 20 capable of manually discharging the compressed air supplied to the air cylinder is provided in the air flow path between the compressed air source and the electromagnetic valve.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a crouching device for lowering the vehicle height by discharging the air of an air spring mounted on an air suspension vehicle with a leveling valve. More specifically, the present invention relates to a crouching device equipped with an emergency vehicle height restoration mechanism when a lowered vehicle height cannot be restored due to a failure of an electromagnetic valve or the like.

[0002]

[Prior Art]

 In vehicles equipped with an air suspension mechanism such as buses and trucks, an air spring is provided between the chassis frame and the axle, and compressed air is supplied from the air tank to the air spring via a leveling valve, and the chassis frame is then used by the air spring. Is suspended. When the axle is displaced in the vertical direction relative to the chassis frame, the switching lever of the leveling valve rotates accordingly, and the rotation of this lever allows the compressed air to be supplied to and discharged from the air spring. The chassis frame is kept at a certain height. Conventionally, this air suspension mechanism has been used to provide an axle and a switching lever in order to facilitate the loading and unloading of passengers in vehicles such as buses, and to facilitate the loading and unloading of luggage in vehicles such as trucks. A crouching device is known in which compressed air is supplied via an electromagnetic valve to an air cylinder provided between the two to forcibly rotate the switching lever. Due to the forced rotation of the switching lever, the exhaust port of the leveling valve communicates with the air spring, and the air of the air spring is discharged to lower the vehicle height.

[0003]

[Problems to be solved by the device]

 However, if the electromagnetic valve for supplying compressed air to the air cylinder malfunctions and the air cylinder continues to shrink, the above-mentioned crouching device may continue to discharge air from the air spring and restore the vehicle height. There was a problem that I could not do. An object of the present invention is to provide a crouching device for an air suspension vehicle capable of restoring the vehicle height when the vehicle height cannot be restored due to a trouble in an electric system or a failure of an electromagnetic valve.

[0004]

[Means for Solving the Problems]

 A configuration of the present invention for achieving the above object will be described based on FIG. 1 corresponding to an embodiment. The present invention relates to an air spring 16 provided between a chassis frame 17 and an axle 18 for suspending the chassis frame 17 by compressed air from a compressed air source 11 and an air spring between the compressed air source 11 and the air spring 16. A leveling valve 13 provided in the flow path to control the supply and discharge of compressed air to keep the chassis frame 17 at a constant height, and to the air spring 16 according to the rotation angle provided rotatably on the leveling valve 13. The switching lever 13d of the leveling valve for switching the supply and discharge of compressed air, and the relative displacement between the chassis frame 11 and the axle 18 provided between the axle 18 and the switching lever 13 rotate or compress the switching lever 13d. From the air cylinder 14 that expands and contracts by the supply and discharge of air to rotate the switching lever 13d, and from the compressed air source 11 by an electric signal. The air cylinder 14 by supplying compressed air to the air cylinder 14 is an improvement of the air suspension vehicle crouching apparatus and an electromagnetic valve 22 causes a small contraction. The characteristic configuration is that an emergency restoration valve 20 capable of manually discharging the compressed air supplied to the air cylinder 14 is provided in the air flow path between the compressed air source 11 and the electromagnetic valve 22.

[0005]

[Action]

 When it becomes impossible to restore the vehicle height that has been lowered due to a trouble in the electric system or a failure of the electromagnetic valve 22, the emergency restoration valve 20 is manually operated, and the compressed air that has been contracting the air cylinder 14 is restored to the restoration valve 20. The compressed air is supplied to the air spring 16 through the leveling valve 13 by rotating the switching lever 13d.

[0006]

【Example】

 Next, an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, compressed air is supplied from a compressed air source 11 mounted on a bus to an air spring 16 via a leveling valve 13. The air spring 16 has a plate 16a fixed to the chassis frame 17, a base 16b attached to the 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 compressed air is supplied to the inside thereof. A contact rubber 21 made of rubber is fixed to the upper surface of the base 16b so that the plate 16a contacts the top of the rubber 21 when the compressed air in the air spring 16 is discharged. The air spring 16 is configured so that vibration generated by unevenness of the road surface is absorbed by elasticity of the compressed air stored inside the air spring 16 and is not transmitted to the chassis frame 17 while the vehicle is traveling.

The leveling valve 13 is a 3-port / 3-position switching valve. The inlet port 13a is connected to the compressed air source 11, the outlet port 13b is connected to the air spring 16, and the exhaust port 13c is open to the atmosphere. It The valve 13 is fixed to a chassis frame 17, and a proximal end of a switching lever 13d is pivotally attached to the valve 13. The tip of the switching lever 13d is pivotally attached to the bracket 19 via the air cylinder 14. That is, the air cylinder 14 is composed of a cylinder body 14a, a rod 14b with a piston that slides in the cylinder body 14a, and a spring 14c that urges the rod 14b to push down, and the tip of the switching lever 13d is of the cylinder body 14a. It is pivotally attached to the top and the lower end of the rod 14b is pivotally attached to the bracket 19. When the lever 13d is in the horizontal state as shown by the solid line, the port 13a and the port 13b are blocked, and when the lever 13d is in the upward direction as shown by the chain double-dashed line, the port 13a and the port 13b are in communication with each other and the lever 13d is As shown by the broken line, the port 13b and the exhaust port 13c communicate with each other when facing downward.

An emergency restoration valve 20 and an electromagnetic valve 22 are provided in the air flow path 15b branched from the air flow path 15a connected to the compressed air source 11. These valves 20 and 22 are 3-port 2-position switching valves, the emergency restoration valve 20 is a manually operated valve, and the electromagnetic valve 22 is an electromagnetically controlled valve. The port 20a of the emergency restoration valve 20 is connected to the compressed air source 11, the port 20b is connected to the port 22a of the electromagnetic valve 22 and the port 20c is open to the atmosphere. The port 22b of the electromagnetic valve 22 is connected to the rod-side port 14d of the air cylinder 14, and the port 22c is open to 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 and the port 22b communicate with each other, and when the switch 23 is opened, the port 22b and the exhaust port 22c are connected. Are configured to communicate with each other.

The operation of the crouching device having such a configuration will be described. For example, when the vehicle height is lowered to facilitate passengers getting on and off the bus, the driver closes the manual switch 23. The electromagnetic valve 22 is turned on so that the port 22a and the port 22b communicate with each other, and compressed air is supplied to the port 14d of the air cylinder 14. As shown in FIG. 2, the air cylinder 14 contracts against the elastic force of the spring 14c and forcibly rotates the switching lever 13d clockwise. As a result, the switching lever 13d moves downward, the port 13b of the leveling valve 13 and the exhaust port 13c communicate with each other, the compressed air in the air spring 16 is discharged to the atmosphere from this port 13c, and the vehicle height decreases.

After the passengers have finished getting on and off, the driver opens the manual switch 23 to restore the height of the bus. As shown in FIG. 1, the electromagnetic valve 22 is turned off so that the port 22b communicates with the exhaust port 22c, and the compressed air in the air cylinder 14 passes from the port 14d to the atmosphere through the port 22c of the electromagnetic valve 22. Is discharged. The air cylinder 14 expands due to the elastic force of the spring 14c and forcibly rotates the switching lever 13d counterclockwise. As a result, the switching lever 13d moves upward, the ports 13b and 13a of the leveling valve 13 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 causes the chassis frame 17 to move to a predetermined height. Raise it up. When the axle 18 is displaced in the vertical direction relative to the chassis frame 17, the extended air cylinder 14 follows the displacement of the axle 18 to rotate the switching lever 13d of the leveling valve 13, thereby causing the air spring 16 to move. The leveling valve 13 supplies and discharges compressed air to maintain the chassis frame 17 at a constant height.

The characteristic operation of the present embodiment is an emergency operation when the electromagnetic valve 22 remains in the ON state due to a trouble in the electric system or a failure of the electromagnetic valve 22 even if the switch 23 is opened. The operation of the restoration valve 20 is performed. When the electromagnetic valve 22 continues to be in the ON state, the compressed air is continuously supplied to the port 14d of the air cylinder 14, so that the compressed air remains discharged from the air spring 16 and the vehicle height cannot be restored. At this time, the cock 20d of the restoration valve 20 is manually turned as shown in FIG. The valve 20 is switched, the port 20a is closed, and the port 20b and the port 20c communicate. Compressed air in the air cylinder 14 is discharged from the port 14d to the atmosphere through the port 20c of the restoration valve 20. As a result, the switching lever 13d is turned upward, the compressed air from the compressed air source 11 is supplied to the air spring 16 through the leveling valve 13, and the chassis frame 17 is restored to a predetermined height.

In the above embodiment, the bus is used as the vehicle, but this is an example, and a truck or other vehicle may be used as long as the vehicle has a vehicle body suspended by air sprinkling.

[0013]

[Effect of the device]

 As described above, according to the present invention, since the emergency restoration valve is provided in the air flow path between the electromagnetic valve and the compressed air source, the vehicle height is restored due to an electric system trouble or a malfunction of the electromagnetic valve. When it becomes impossible, you can easily and surely restore the vehicle height and operate by manually operating the restoration valve.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a state in which compressed air is being supplied to an air spring of a crouching device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a state in which compressed air is being discharged into the atmosphere from the air spring.

FIG. 3 is a configuration diagram showing a state in which a vehicle height is restored by an emergency restoration valve when the electromagnetic valve fails.

[Explanation of symbols]

 11 Compressed Air Source 13 Leveling Valve 13d Switching Valve 14 Air Cylinder 16 Air Spring 17 Chassis Frame 18 Axle 20 Emergency Restoration Valve 22 Electromagnetic Valve

Claims (1)

[Scope of utility model registration request] 1. An air spring (16) provided between a chassis frame (17) and an axle (18) for suspending the chassis frame (17) by compressed air from a compressed air source (11); A leveling valve (1) provided in an air flow path between an air source (11) and the air spring (16) to control the supply and discharge of compressed air to keep the chassis frame (17) at a constant height.
3), a leveling valve switching lever (13d) that is rotatably provided on the leveling valve (13) and switches supply and discharge of compressed air to and from an air spring according to a rotation angle, and the axle (18). The switch lever (13d) is provided between the switch lever (13d) and the switch lever (13d) is rotated by the relative displacement of the chassis frame (11) and the axle (18) or expanded and contracted by supplying and discharging compressed air. An air cylinder (14) for rotating the lever (13d) and an electromagnetic cylinder for supplying compressed air from the compressed air source (11) to the air cylinder (14) by an electric signal to reduce the size of the air cylinder (14). In a crouching device for an air suspension vehicle including a valve (22), compressed air supplied to the air cylinder (14) is supplied to an air flow path between the compressed air source (11) and the electromagnetic valve (22). Equipped with an emergency restoration valve (20) that can be discharged manually Crouching apparatus air suspension vehicles, characterized in that the.