JPH04131509U - Air suspension car kneeling device - Google Patents

Abstract

(57) [Summary] [Purpose] Surge tank 5 to improve riding comfort
The air filling time of the air spring 7 connected in communication with each other is short, and the vehicle body can be quickly raised or lowered. [Structure] The surge tank 5 is connected to the air spring 7 via a communication passage 25, and the passage 25 is provided with a normally open solenoid valve 27 that can close the communication passage.
is configured to close during kneeling. During kneeling, the compressed air in the surge tank 5 is confined, and only the compressed air from the air spring 7 is discharged, and when the vehicle height is restored, compressed air is supplied only to the air spring 7.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a vehicle equipped with an air suspension device. For more information, see Air Kneeling device that lowers the vehicle height of trucks, buses, etc. using a suspension device It is related to.

0002

[Conventional technology]

Air suspension devices such as trucks and buses use compressed air sources such as air tanks. Supply compressed air to the air spring through the leveling valve, and It is configured to keep its height constant with a lub. This kneeling device It is installed in air suspension devices such as (for example, Japanese Patent Laid-Open No. 160610/1983). By bus etc. In order to make it easier for passengers to get on and off, trucks, etc., make it easier to load and unload luggage. This kneeling device can be used to I am trying to lower the vehicle height.

0003 Conventionally, this type of kneeling device has an air tank or The compressed air sent from the compressed air source 1 such as a compressor is passed through the leveling valve. After once flowing into the surge tank 5 via the air pump 3, the air is supplied to the air spring 7. Due to this supply, the rubber membrane 9 of the air spring 7 expands and the chassis frame 11 is The surge tank 5 is elastically supported on the shaft 13, and the surge tank 5 receives air pressure changes from the air spring 7. Absorbs motion and improves riding comfort. A rod 1 is attached to the bracket 14 of this axle 13. The lower end of the rod 15 is pivotally mounted, and the upper end of the rod 15 is connected to an air cylinder 19. S A compressed air passage 18 is connected to the piston rod 16 side of the cylinder 19. 18 is connected to the compressed air source 1 via a solenoid valve 21. Tip of piston rod 16 The end is pivotally connected to the lever 17 of the leveling valve 3.

0004 As a result, if the amount of air in the air spring decreases or increases and the vehicle height changes, The lever 17 rotates to supply or discharge compressed air to maintain the vehicle body at a constant height. D - During kneeling, turn on the kneeling switch 23 to switch the solenoid valve 21, and By forcibly lowering the lever 6, the lever 17 of the leveling valve 3 is rotated downward, This allows the compressed air in the air spring 7 and surge tank 5 to be discharged to increase the vehicle height. I'm trying to lower it.

[0005]

[Problem that the idea aims to solve]

However, in the above kneeling device, the supply of compressed air to the air spring 7 is limited. This is done after compressed air flows into the surge tank 5 from the ring valve 3, and vice versa. The compressed air of the spring 7 passes through the surge tank 5 and is discharged from the leveling valve 3. Therefore, not only the air spring 7 but also the compression stored in the surge tank 5 Air is also exhausted until the internal pressure reaches atmospheric pressure. For this reason, again When raising the vehicle height, reduce the pressure not only in the air spring 7 but also in the surge tank 5. It is necessary to raise the pressure from atmospheric pressure to the required pressure, and a large volume of air must be supplied. However, there was a problem that it took a long time to raise the vehicle height.

[0006] The purpose of this invention is to connect the surge tank with air to improve riding comfort. Air that requires a short time to fill the spring with air and can quickly raise or lower the vehicle body The purpose of the present invention is to provide a kneeling device for suspension vehicles.

[0007]

[Means to solve the problem]

The configuration of the present invention to achieve the above object will be explained based on FIG. 1 corresponding to an embodiment. I will clarify. The present invention includes an air spring 7 that suspends the vehicle body 11 using compressed air; Compressed air is supplied and discharged into the air spring 7 through the supply and discharge passage 24 to maintain the vehicle body 11 at a constant level. This air supply is connected to the leveling valve 3 that maintains the height and the air spring 7. Air suspension equipped with a surge tank 5 that absorbs air pressure fluctuations in the pulling It is a car kneeling device. Its distinctive features are air spring 7 and serge tongue. A normally open solenoid valve 27 that can close this communication path is provided in the communication path 25 that connects the communication path 5. The solenoid valve 27 is configured to close during kneeling.

[0008]

[Effect]

During kneeling, the solenoid valve 27 is closed to connect the surge tank 5 and air spring 7. The air spring 7 is shut off and only the compressed air inside the air spring 7 is discharged to lower the vehicle height. car height again When raising the air spring, open the solenoid valve 27 to connect the surge tank 5 and air spring 7. The compressed air is supplied to the air spring 7 in the open state.

[0009]

【Example】

Next, one embodiment of the present invention will be described in detail based on the drawings. As shown in Fig. 1, a chassis frame 11, which is the body of a truck, bus, etc., is suspended. The suspended air spring 7 is connected to a plate 29 fixed to the chassis frame 11. , a base 33 attached to the axle 13 via a bracket 14, and a base 33 formed in a cylindrical shape. The rubber film 9 is made up of a rubber film 9. The rubber membrane 9 is connected between the plate 29 and the base 33. When compressed air is supplied to the inside and expands, the chassis frame 1 1 is elastically supported on the axle 13. Also on base 33 A contact rubber 35 made of rubber is fixed to the surface, and an air spring When the compressed air in the rubber ring 7 is discharged, the plate 29 moves to the top of the contact rubber 35. It comes into contact with the part. As a result, the air spring 7 is activated when the vehicle is running. The elasticity of compressed air stored inside absorbs vibrations caused by uneven road surfaces. It functions to prevent the information from being transmitted to the chassis frame 11.

0010 The lower end of the rod 15 is pivotally attached to the bracket 14, and the upper end of the rod 15 is connected to an air Cylinder 19 is connected. Inside the cylinder 19 is a coil spring 20 and a piston rod. A pad 16 is provided. A compressed air passage 1 is provided on the piston rod 16 side of the cylinder 19. 8 is connected, and the compressed air path 18 is connected to the compressed air source 1 via the solenoid valve 21. . The solenoid valve 21 supplies compressed air to the cylinder by switching the kneeling switch 23. 19 or can be discharged from the discharge port 22. The tip of the piston rod 16 of the air cylinder 19 is the lever of the leveling valve 3. It is pivoted to 17. As a result, when the vehicle height changes, the lever 17 rotates to adjust the level. The ring valve 3 switches between supplying and discharging compressed air. In other words, the level The switching valve 3 is a 3-port 3-position switching valve, and port 3a is an air spring valve. port 3b is connected to compressed air source 1, and exhaust port 3c is connected to communicate with Qi. The leveling valve 3 is set so that the lever 17 is horizontal as shown by the solid line in the figure. In this case, ports 3a and 3b are shut off. Also, the lever 17 is at the two points shown in the figure. As shown by the chain line, the vehicle height is low when the vehicle is facing upward, and port 3a and port 3 b, and compressed air is supplied to the air spring 7 via the supply/discharge path 24. Furthermore When the lever 17 is pointing downward as shown by the broken line, the vehicle height is high, and port 3 compressed air is discharged from the air spring 7 by communicating the discharge port 3c with the discharge port 3c. The air spring 7 is connected to the surge tank 5 via a communication path 25. child A normally open solenoid valve 27 is provided in the communication path 25, and the solenoid valve 27 is a kneeling switch. It closes when Chi 23 enters.

[0011] The operation of the kneeling device of an air suspension vehicle configured in this way will be explained. Ru. First, for trucks to load cargo, or for buses to board and disembark passengers. When lowering the vehicle height, the driver turns on the kneeling switch 23 and closes the solenoid valve. 21 to supply compressed air to the air cylinder 19. This allows the piston rod to The door 16 is lowered, the lever 17 is directed downward as shown by the broken line in the figure, and the port 3a is and the exhaust port 3c communicate with each other, and the compressed air of the air spring 7 flows from the exhaust port 3c be discharged. As soon as the switch 23 is turned on, the solenoid valve 27 of the communication path 25 closes. , the compressed air in the surge tank 5 becomes trapped and cannot be discharged. do not have. Completely discharge the compressed air from the air spring 7 to reduce the pressure of the air spring 7. Even if this is done until the pressure reaches atmospheric pressure, the compressed air in the surge tank 5 must be discharged. Since there is no vehicle height, the vehicle height drops quickly.

0012 Next, the loading of cargo onto the truck or the lifting of passengers onto and off the bus is completed. When raising the vehicle height, the driver turns off the switch 23 and closes the exhaust port of the solenoid valve 21. The compressed air of the air cylinder 19 is discharged from the air cylinder 22. As a result, the air cylinder 19 The piston 50 of the piston rod 16 is moved to the specified position by the elastic force of the coil spring 20 inside. The piston rod 16 rises until it hits the stopper 51, and the lever 17 becomes a two-point chain as shown in the figure. It points upward as shown by the line, and port a and port 3b communicate with each other, and compressed air source 1 The compressed air is supplied to the air spring 7 via the supply/discharge path 24. At this time, example For example, in order to rise from atmospheric pressure to the required pressure, the compression force of air spring 7 is required. Therefore, the vehicle height can be raised quickly. In this way After raising the vehicle height, the solenoid valve 27 of the communication passage 25 is open, so the air spring The surge tank 5 communicates with the surge tank 7, and the surge tank 5 has a large capacity to Absorbs the air pressure fluctuation of the air spring 7 and improves the elastic action of the air spring 7. , improve vehicle ride comfort.

[0013] In addition, in the above embodiment, the cylinder that rotates the lever 17 of the leveling valve 3 is Although an air cylinder is shown as an example, a hydraulic cylinder may also be used. In this case oil An oil source is connected to the pressure cylinder. Additionally, an air cylinder 19 is attached to the rod 15 as a kneeling device to lower the vehicle height. The piston rod 16 rotates the lever 17 of the leveling valve 3. However, the port in the leveling valve 3 was removed without using the lever 17. The port 3a and the discharge port 3c may be forced to communicate with each other. Furthermore, in the middle of the supply/discharge path 24 connecting the leveling valve 3 and the air spring 7, A special valve may be provided for evacuation.

[0014]

[Effect of the idea]

As described above, according to the present invention, when lowering the vehicle height by discharging compressed air, closes the solenoid valve to isolate the surge tank from the air spring. Only the compressed air of the air spring is discharged while the compressed air is trapped. Kneeling can be performed quickly, and when compressed air is supplied again to raise the vehicle height. The vehicle height can be quickly adjusted by opening the solenoid valve and supplying compressed air only to the air spring. can be raised to In particular, the device of this invention emits less compressed air during kneeling, so it There is also the advantage that the compressor can be made smaller.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a kneeling device for an air suspension vehicle according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional kneeling device.

[Explanation of symbols]

1 Compressed air source 3 Leveling valve 5 Surge tank 7 Air spring 11 Chassis frame (vehicle body) 24 Supply/discharge path 25 Communication path 27 Solenoid valve

Claims (1)

[Scope of utility model registration request] 1. An air spring (7) that suspends a vehicle body (11) using compressed air; A kneeling device for an air suspension vehicle, comprising a leveling valve (3) that maintains the height, and a surge tank (5) that is communicatively connected to the air spring (7) and absorbs air pressure fluctuations of the air spring, the kneeling device comprising: A normally open solenoid valve (27) capable of closing the communication passage is provided in the communication passage (25) connecting the air spring (7) and the surge tank (5), and the solenoid valve
(27) is a kneeling device for an air suspension vehicle, characterized in that it is configured to close during kneeling.