JPH051512U - Vehicle height adjustment device - Google Patents

Abstract

(57) [Summary] [Purpose] To ensure a stable desired supply / discharge speed for the front and rear air chambers. [Composition] The discharge port of the air compressor 3 includes front side branch passages 6a, 6b and rear side branch passage 7 for forming front and rear air chambers 1a of the air suspension device.
Supply / discharge valves 8a, 8b, 9a, 9b are connected to the front side branch passages 6a, 6b and the rear side branch passage 7, respectively, and are connected to the respective 1b, 2a, 2b. The front side branch passages 6a, 6 are used in the case where the air compressor 3 side and the air chambers 1a, 1b, 2a, 2b are connected and disconnected by opening and closing 8b, 9a, 9b.
b Rear side branch passages 7a, 7b are provided with orifices 11a, 11b and 12 for adjusting the supply / discharge speeds, respectively, and the supply / discharge speeds of compressed air to / from the front side air chambers 1a, 1b and the rear side air chambers 2a, 2b. 1 for each orifice 11a, 11b
Adjust independently by 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle height adjusting device for an automobile.

[0002]

[Prior Art]

 In this type of vehicle height adjustment device, the outlet of the air compressor, which is the power supply source, uses the front branch passage and the rear branch passage that branch off from the discharge passage to connect the front and rear air of the air suspension device. Is connected to the chamber, and a supply / discharge valve is provided in each of the front-side branch passage and the rear-side branch passage, and is connected to the discharge-side passage (the passage where the front-side branch passage and the rear-side branch passage merge). Is equipped with a dryer for removing water in the compressed air, and an exhaust passage provided with an exhaust valve is branched along the way. The supply / exhaust valve and the exhaust valve are opened / closed in response to a command from this controller when a vehicle height increase signal or vehicle height decrease signal is input to the controller. Is input, the intake / exhaust valve is opened with the exhaust valve closed, compressed air from the air compressor is supplied to the air chamber of the air suspension device, and a vehicle height decrease signal is input to the controller. At this time, both the supply / discharge valve and the exhaust valve are opened, and the compressed air in the air chamber is discharged to the exhaust passage. Note that the dryer is provided with an orifice for adjusting the supply / discharge speed, and this orifice adjusts the supply / discharge speed of compressed air rapidly to adjust the vehicle height suddenly (rapid supply / discharge of compressed air). It is designed to prevent hunting from occurring.

This similar technique is disclosed in, for example, Japanese Utility Model Laid-Open No. 62-87730.

[0004]

[Problems to be solved by the device]

 However, in the case of the conventional vehicle height adjusting device described above, an orifice is provided in the dryer of the discharge side passage, and the single orifice is used to adjust the supply / discharge speed of the compressed air to the front and rear air chambers. Therefore, it is difficult to secure a stable desired supply / discharge speed of compressed air. That is, if the compressed air supply / discharge speed for the front and rear air chambers is adjusted with one orifice, the compressed air supply / discharge for both the front and rear air chambers and for one side In the case where compressed air is supplied and discharged only to the air chambers, large variations occur in the supply and discharge speeds. In addition, although the front air chamber and the rear air chamber have different capacities due to the characteristics of the vehicle, one orifice for both air chambers adjusts the supply / discharge speed. It was not possible to individually adjust the air supply / exhaust speeds of the front and rear air chambers.

Therefore, the present invention is intended to provide a vehicle height adjusting device capable of ensuring a stable desired supply / discharge speed for the front and rear air chambers.

[0006]

[Means for Solving the Problems]

 As a means for solving the above-mentioned problems, the present invention is to connect the discharge port of an air compressor to front and rear air chambers of an air suspension device by a front branch passage and a rear branch passage. In the vehicle height adjusting device, in which a supply / discharge valve is provided in each of the front-side branch passage and the rear-side branch passage, and opening / closing of each of the supply / discharge valves connects and disconnects the air compressor side and each air chamber, The front-side branch passage and the rear-side branch passage are respectively provided with orifices for adjusting the supply / discharge speed.

[0007]

[Action]

 The front branch passage and the rear branch passage are provided with orifices for adjusting the supply and discharge speeds respectively, so that the supply and discharge speeds of compressed air for the front air chamber and the rear air chamber can be controlled independently by each orifice. You will be able to adjust.

[0008]

【Example】

 Next, an embodiment of the present invention will be described with reference to FIG.

In the drawings, 1a, 1b, 2a and 2b are air chambers of an air suspension device arranged on the front side and the rear side, and 3 is compressed air in each of the air chambers 1a, 1b, 2a and 2b. Is an air compressor for supplying. The discharge side passage 5 in which the discharge port of the air compressor 3 is opened branches into a front side branch passages 6a, 6b and a rear side branch passage 7 in the middle thereof, and the rear side branch passage 7 further extends from the middle thereof to the left wheel side. It branches into a passage 7a and a passage 7b on the right wheel side. The front branch passage 6a is a passage on the left wheel side, and the front branch passage 6b is a passage on the right wheel side.

Further, the respective passages 6a, 6b, 7a, 7b at the ends are connected at their ends to the air chambers 1a, 1b, 2a, 2b, respectively, and in the middle of them, by a normally closed type switching valve. The configured supply / discharge valves 8a, 8b, 9a, 9b are interposed. In the normal state, the supply / discharge valves 8a, 8b, 9a, 9b close the passages 6a, 6b, 7a, 7b, and when receiving a valve opening command (excitation signal) from the controller 10, the passages 6a, 6b, 7a, It is designed to open 7b. Furthermore, orifices 11a and 11b and an orifice 12 are provided in the middle of the front side branch passages 6a and 6b and the rear side branch passage 7, respectively, and these orifices 11a, 11b and 12 are used to connect the front side and the rear side. The supply / discharge speed of compressed air to / from the side air chambers 1a, 1b, 2a, 2b is adjusted. The orifice 12 has a large diameter in consideration of the fact that compressed air for supply and discharge to and from the left and right air chambers 2a and 2b passes through.

A dryer 4 for removing water in the compressed air is provided in the middle of the discharge side passage 5, and an exhaust passage 13 for discharging the compressed air to the intake side of the air compressor 3. Are diverged. An exhaust valve 14 constituted by a normally closed switching valve is provided in the middle of the exhaust passage 13. The exhaust valve 14 normally closes the exhaust passage 13 and opens from the controller 10. When the valve command (excitation signal) is received, the exhaust passage 13 is opened.

Further, in the figure, 15 is a motor for driving the air compressor 3 in response to a command from the controller 10, and 16a, 16b and 17 are vehicle height detectors provided on the front side and the rear side, respectively. is there. The detection signals from the vehicle height detectors 16a, 16b, 17 are input to the controller 10, and the controller 10 outputs the signals to the motor 15, the supply / discharge valves 8a, 8b, 9a, 9b, and the exhaust valve 14 based on these detection signals. Output instructions.

In such a configuration, the vehicle height is adjusted as follows.

(1) When raising the front side and the rear side of the vehicle For example, the vehicle height becomes lower than the reference vehicle height, and a vehicle height increase signal is input from the vehicle height detectors 16a, 16b, 17 to the controller 10. Then, an operation command is output from the controller 10 to the motor 15, and a valve opening command is output to the supply / discharge valves 8a, 8b, 9a, 9b while the exhaust valve 14 is closed. As a result, the air compressor 3 which has started to operate and the air chambers 1a, 1b, 2a, 2b on the front side and the rear side are brought into conduction through the orifices 11a, 11b, 12 and compressed air flows from the air compressor 3 to the air chambers 1a, 1a, 1b. It is supplied to 1b, 2a and 2b, and the front side and the rear side of the vehicle are raised by a set amount.

(2) In the case of lowering the front side and the rear side of the vehicle For example, the vehicle height becomes higher than the reference vehicle height, and a vehicle height drop signal is input from the vehicle height detectors 16a, 16b, 17 to the controller 10. Then, a valve opening command is output to the exhaust valve 14 and the supply / discharge valves 8a, 8b, 9a, 9b. As a result, the compressed air in the air chambers 1a, 1b, 2a, 2b passes through the orifices 11a, 11b, 12 and is discharged from the exhaust passage 13, and the front side and the rear side of the vehicle descend by a set amount.

In any of the above cases (1) and (2), this vehicle height adjusting device is configured to supply and discharge the compressed air to and from the front air chambers 1a and 1b and the rear air chambers 2a and 2b. Because of the structure in which the orifices 11a, 11b and the orifice 12 are separately adjusted, the supply / discharge speeds for the front and rear air chambers 1a, 1b and 2a, 2b are optimized according to the characteristics of the vehicle body. It can be adjusted (set).

(3) When only the rear side of the vehicle is raised or lowered: The vehicle height on the rear side becomes lower than the reference vehicle height, and the vehicle height detector 17 sends a rear vehicle height increase signal to the controller 10. When input, an operation command is output from the controller 10 to the motor 15, and the rear side supply / discharge valves 9a, 9b are kept closed while the exhaust valve 14 and the front side supply / discharge valves 8a, 8b are closed. A valve open command is output to. As a result, the air compressor 3 and the rear air chambers 2a and 2b are electrically connected to each other through the orifice 12, and compressed air is supplied from the air compressor 3 to the rear air chambers 2a and 2b. When the vehicle height on the rear side becomes higher than the reference vehicle height and the vehicle height detector 17 inputs a rear vehicle height decrease signal to the controller 10, the controller 10 outputs the exhaust valve 14 and the supply / discharge valve. A valve opening command is output to 9a and 9b, and the compressed air in the air chambers 2a and 2b passes through the orifice 12 and is discharged from the exhaust passage 13.

(4) When only the front side of the vehicle is raised or lowered, the vehicle height on the front side becomes lower than the reference vehicle height, and the vehicle height detectors 16a, 16b move the controller 10 to the vehicle height on the front side. When the rising signal is input, an operation signal is input from the controller 10 to the motor 15, and at the same time, the exhaust valve 14 and the supply / discharge valves 9a, 9b on the rear side are kept closed, and the supply / discharge valve 8a on the front side is supplied. , 8b, the compressed air from the air compressor 3 passes through the orifices 11a, 11b and is supplied to the front air chambers 1a, 1b. When the vehicle height on the front side becomes higher than the reference vehicle height and a vehicle height drop signal on the front side is input from the vehicle height detectors 16a and 16b to the controller 10, the controller 10 supplies the exhaust valve 4 and the exhaust valve 4. A valve opening command is output to the discharge valves 8a and 8b, and the compressed air in the air chambers 1a and 1b passes through the orifices 11a and 11b and is discharged from the exhaust passage 13.

In any of the cases (3) and (4), this vehicle height adjusting device determines the supply / discharge speed of compressed air to / from the air chambers 1a, 1b and 2a, 2b on the front side and the rear side from the orifice 11a. , 11b and the orifice 12 are separately provided, so there is almost no difference in the supply / discharge speed between the case where the front side and the rear side of the vehicle are both moved up and down and the case where only one side is moved up and down.

(5) When either the left or right side of the front side of the vehicle is raised or lowered, for example, when a vehicle height increase signal is input to the controller 10 from the vehicle height detector 16a on the left side. The controller 10 outputs a valve opening command to the supply / discharge valve 8a, and the compressed air of the air compressor 3 passes through the orifice 11a and is supplied to the left air chamber 1a. When a vehicle height drop signal is input to the controller 10 from the vehicle height detector 16a on the left side, the controller 10 outputs a valve opening command to the exhaust valve 14 and the supply / discharge valve 8a, and the compressed air in the air chamber 1a is output. Is discharged to the exhaust passage 13 through the orifice 11a.

On the right side, the air chamber 1b is supplied and discharged in exactly the same manner as the case on the left side described here, though it is left-right reversed.

If the orifices 11a and 11b are provided in the passages 6a and 6b, respectively, as in the vehicle height adjusting device shown in this embodiment, the compressed air is supplied to the air chambers 1a and 1b on the left and right sides of the front side. The discharge speed can be adjusted more stably and with high accuracy.

It should be noted that the embodiment of the present invention is not limited to the one described above. For example, as shown in FIG. 2, the front side branch passage is the base passage 106 and the left and right air chambers 1a and 1b are further provided. The base passage 106 may be provided with an orifice 11 and the rear side branch passages 7a, 7b may be provided with one orifice 12a, 12b, respectively.

[0024]

[Effect of the device]

 As described above, according to the present invention, the front side branch passage and the rear side branch passage are provided with the respective orifices for adjusting the supply / discharge speed, so that the supply / discharge speed of the compressed air with respect to the front air chamber and the rear air chamber can be controlled. Since it can be adjusted independently, the supply / discharge speed varies depending on whether the air is supplied to / exhausted from both the front and rear air chambers at the same time or the air is supplied to / exhausted from only one air chamber. In addition, the front and rear air chambers can be adjusted to the appropriate supply / discharge speed according to the vehicle body characteristics.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram showing another embodiment of the present invention.

[Explanation of symbols]

1a, 1b, 2a, 2b ... Air chamber, 3 ... Air compressor, 6a, 6b ... Front side branch passage, 7 ... Rear side branch passage, 8a, 8b, 9a, 9b ... Supply / discharge valve, 11
a, 11b, 12 ... Orifices.

Claims (1)

[Claims for utility model registration] 1. The outlet of the air compressor is connected to the front and rear air chambers of the air suspension device by a front branch passage and a rear branch passage, and the front side In the vehicle height adjusting device, a supply / discharge valve is provided in each of the branch passage and the rear side branch passage, and the air compressor side and each air chamber are connected and disconnected by opening / closing the supply / discharge valves. A vehicle height adjusting device characterized in that an orifice for adjusting a supply / discharge speed is provided in each of the branch passage and the rear branch passage.