JPS62103210A - Car height adjusting device - Google Patents

Abstract

PURPOSE:To perform car height adjustment quickly by furnishing a common and separate exhaust valves for car height adjusters in the front and rear parts of the car body, supplying compressed air to either of the car height adjusters and exhausting the compressed air from the other. CONSTITUTION:A gas chamber 12 is formed between a cylinder unit 10a of a hydraulic shock absorber 10 and the car body using diaphragm. A compressor 21 is connected to the gas chamber 12 of each pneumatic spring device 6-9 via an air pressure passage 23, which is composed of a common path 23a and a plurality of paths 23b, 23c devoted specially for the purpose. Here the common path 23a is connected with a common exhaust valve 25 while the separate paths 23b, 23c with respectively opening/closing valves 26, 28 and proprietary exhaust valves 27, 29. Each valve is controlled by a control unit 41, and compressed air is supplied to either of the pneumatic spring devices 6-9 in the front ad rear parts of car body while compressed air is exhausted from the other.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application in M Industry) The present invention relates to a method for adjusting the vehicle height A of an automobile, which uses the supply and discharge of compressed air to adjust the vehicle height.

(Prior Art) Some vehicle height adjustment devices for automobiles use compressed air as a working fluid and adjust the vehicle height according to the supply and discharge of this compressed air. In other words, Utsukai Sho 59-1276
As shown in Publication No. 10, a pneumatic spring device as a vehicle height A assembly is disposed between the wheels and the vehicle body, and an exhaust valve is installed in the pneumatic passage connecting this pneumatic spring device and a compressed air source. and one with a switching valve connected. When raising the vehicle height, compressed air from the compressed air source is supplied to each pneumatic spring device of the front and rear wheels through a switching valve, or to one side of the front and rear wheels. If compressed air is supplied only to the pneumatic spring device, and conversely, when lowering the vehicle height, the compressed air is supplied only from the pneumatic spring devices of the front and rear wheels, or from the pneumatic spring device of either the front or rear wheels. This allows air to be exhausted to the atmosphere.

By the way, compressed air generally contains a considerable amount of moisture, and this moisture in compressed air can have an adverse effect, such as causing rust on the pneumatic spring device used as the vehicle height adjuster. . For this reason, as stated in the above publication, the compressed air immediately after being compressed by the compressor,
A dehumidifier such as silica gel is passed through the dryer. In order to regenerate the dehumidifying capacity of this dryer, when discharging compressed air from the pneumatic spring device,
This discharged compressed air is always passed through a dryer.

(Problem to be Solved by the Invention) However, in the conventional type in which only one exhaust valve is provided in the pneumatic passage between the compressed air source and the dryer, the pneumatic spring device on either side of the front or rear wheels Since it is not possible to simultaneously take in air from the pneumatic spring device on the other side and exhaust air from the pneumatic spring device on the other side, there is a problem in that depending on the mode of vehicle height adjustment, it takes a lot of time to adjust the vehicle height.

For example, when adjusting the vehicle height by lowering the height of the front of the vehicle and raising the rear of the vehicle, it is necessary to prioritize the supply and discharge of compressed air. After supplying compressed air through the front wheel, the compressed air must be discharged from the pneumatic spring device for the front wheels, and so on, after either air supply or exhaust has been completed, the other must be performed.

Therefore, an object of the present invention is to provide a vehicle height adjustment system for an air compression type automobile equipped with a dryer for drying compressed air, while sufficiently regenerating the dryer, and to adjust the pneumatic spring device for the front wheels and the rear wheels. To provide a vehicle height adjustment device for an automobile that can perform vehicle height adjustment more quickly by simultaneously supplying air to one side pneumatic spring device and exhausting air from the other side. be.

(Means and operations for solving the problems) In order to achieve the above-mentioned object, the present invention has the following configuration. That is, a vehicle height adjusting body disposed between the wheels and the vehicle body and changing the vehicle height according to supply and discharge of compressed air, and a dryer connected to a pneumatic passage connecting the vehicle height adjusting body and a compressed air source. A vehicle height adjustment device for a vehicle comprising: a front and rear wheel common exhaust valve connected to a pneumatic passage between the compressed air source and the dryer and configured to discharge compressed air from each of the vehicle height adjustment bodies for the front and rear wheels; , a front wheel exclusive exhaust valve for discharging compressed air in the vehicle height adjusting body on the front wheel side, a rear wheel exclusive exhaust valve for discharging the compressed air in the vehicle height adjusting body on the rear wheel side, and a front wheel pneumatic passage among the pneumatic passages. an opening/closing valve for connecting and disconnecting the system and the rear wheel pneumatic passage system, and controlling each of the above valves independently to discharge the compressed air in each vehicle height adjustment body for the front and rear wheels; A control means for discharging compressed air 2 from the front and rear wheel common exhaust valve when compressed air is discharged from only one of the height adjustment body and the rear wheel height adjustment body and the compressed air is not supplied to or discharged from the other. .

This is a configuration equipped with the following.

With this configuration, not only can air be supplied to or exhausted from the vehicle height adjusters of the front and rear wheels, but also the air pressure passage system for the front wheels and the pneumatic passage for the rear wheels can be easily controlled by the on-off valves. In such cases, air can be supplied to either the front wheel height adjustment body or the rear wheel height adjustment body and exhausted from the other at the same time using a dedicated exhaust valve while shutting off the system. Vehicle height adjustments can also be made quickly.

In order to regenerate the dryer, the discharged compressed air is passed through the dryer.In addition to lowering the overall vehicle height, there are also cases where the rear of the vehicle is lowered while maintaining the vehicle height at the front of the vehicle, and This design allows for three modes of lowering the front of the vehicle while maintaining the rear vehicle height.In other words, unless air supply and exhaust are performed at the same time, the compressed air that is exhausted Since the water is always passed through the dryer, this dryer can also be sufficiently regenerated and its dehumidifying ability can be sufficiently maintained.

(Example) Embodiments of the present invention will be described below with reference to the accompanying drawings.

In Figure 1, ■ is the vehicle body, 2 is the left front wheel, 3 is the right front wheel,
4 is the left rear wheel, 5 is the right rear wheel, and each wheel 2 to 5 and the vehicle body 1
A pneumatic spring device 6. serves as a vehicle height adjustment body.
7.8 or 9 are arranged. The pneumatic spring devices 6 to 9 have the same configuration, and as shown in FIG.
and the vehicle body 1, a gas chamber 1 is connected by a diaphragm 11.
2, and when compressed air is supplied to the gas chamber 12, the gas chamber 12 expands to raise the vehicle height, and conversely, when the compressed air is discharged from the gas chamber 12, the vehicle height is lowered. .

21 is a compressor as a compressed air source driven by a motor 22, and this compressor 21 is
It is connected to the gas chamber 13 of each pneumatic spring device 6 to 9 via a pneumatic passage 23 . This air pressure passage 23 has a common passage portion 23a extending from the compressed air discharge port of the compressor 21.

Two dedicated passages 1 branched from this common passage part 23a
23b and 23c. One dedicated passage section 23b is connected to the gas chamber 13 in each pneumatic spring device 6.7 on the front wheel 2.3 side as a pneumatic passage system for the front wheels, and the other dedicated passage section 23c is connected to the gas chamber 13 in each pneumatic spring device 6.7 on the front wheel 2.3 side. As a pneumatic channel system, it is connected to the gas chamber 12 in the pneumatic spring device 8.9 on the side of the rear wheel 4.5.

A dryer 24 containing a built-in dehumidifier such as silica gel is connected to the common passage section 23a.
4, that is, on the compressor 21 side, a common exhaust valve 25 consisting of an electromagnetic opening/closing valve is connected. Further, an electromagnetic on-off valve 26 is connected to the front-wheel dedicated passage section 23b, and on the downstream side of this on-off valve 26 (on the gas chamber 12 side), a front-wheel dedicated exhaust valve 27 consisting of an electromagnetic on-off valve is connected. is connected. Similarly, for the rear wheel exclusive passage section 23c, there is an electromagnetic on-off valve 28, and a rear-wheel exclusive exhaust valve 29 consisting of an electromagnetic on-off valve downstream of this on-off valve 28.
is connected. Further, a compressed air storage tank 30 is connected to the common passage section 23a via a communication passage section 23d, and an electromagnetic on-off valve 31 is connected to the communication passage section 23d. In addition, the common passage section 23
A relief valve 32 is connected to a to prevent overpressure, and opens when the internal pressure exceeds a predetermined pressure.

Note that the compressor 21, motor 22, dryer 2
4. The common exhaust valve 25 is configured as a unit body A as shown in FIG.
．． 31 and the relief valve 32 are also constructed as a unit body B as shown in FIG.

Reference numeral 41 in FIG. 2 denotes a control unit as a control means. Inputs are sent to this control unit 41 from each sensor 42, 43, 44 and switch 45, 46, while the control unit 41 receives input from the motor 22 and each Valve 25.2
6.27.28.29.31. Among the sensors 42 to 44, sensor 42 detects the vehicle height at the front of the vehicle, sensor 43 detects the vehicle height at the rear of the vehicle, and sensor 44 detects the vehicle speed. Also, among the switches 45 and 46, switch 45
Detects whether the pressure inside the tank 30 is maintained at a predetermined pressure or higher. Further, the switch 46 is
Provided near the driver's seat, a command to change the vehicle height by manual operation of the driver's car, for example, a command to automatically control the standard vehicle height by automatic vehicle height adjustment (auto), a command to set the vehicle height to "high", Alternatively, a command to lower the vehicle height can be manually selected.

Next, the operation of the above configuration will be explained, but first the overall outline will be explained.

Compressed air obtained by the compressor 21 passes through a dryer 24 and is dried, and then passes through an on-off valve 31 and is temporarily stored in a tank 3. When the vehicle height is increased, the gas is basically supplied from this tank 30 to the gas chambers 12 of the front or rear wheels. And tank 3
When the pressure in each gas chamber 12 is not high enough, the switch 45 detects that the pressure in each gas chamber 12 is directly from the compressor 31.
supplied to In addition, when the vehicle speed becomes equal to or higher than a predetermined vehicle speed, the vehicle speed sensor 44 automatically detects the
This is used to prohibit execution regardless of switching between "high" and "low".

Here, depending on the selection of the manually operated vehicle height changeover switch 46, in the embodiment, the vehicle height can be increased or decreased overall (both the front and rear of the vehicle body 1); High maintenance φ Vehicle rear down ■ Maintain front vehicle height, rear vehicle up ■ Front vehicle down, rear vehicle height maintained ■ Front vehicle up, rear vehicle height maintained ■ Front vehicle down, rear vehicle up ■ Vehicle body There are eight possible configurations: front up and rear down.

The relationship between the above-mentioned aspects and the operating state of each valve 25 to 29.31 is summarized in the following table.

In addition, when the pressure in the tank 30 is insufficient and there is no need to adjust the vehicle height, the on-off valve 3 of each valve is
1 is opened, and the pressure inside the tank 30 is increased by the operation of the compressor 7 server 21. Furthermore, when it is necessary to raise the vehicle height when the internal pressure of the tank 30 is insufficient, the compressor 21 is operated to supply compressed air from there to the gas chamber 12 for raising the vehicle height. However, the tank 30 may be refilled with compressed air during this vehicle height adjustment (by opening the on-off valve 31), or after the vehicle height adjustment has been completed (the on-off valve may be closed during vehicle height adjustment). 31).

As is clear from the above table, the compressed air from the gas chamber 12 is discharged in five operating modes (■, ■, ■, ■, ■), but among these, three modes (■, ■, (2) is discharged through the common exhaust valve 25, that is, discharged through the dryer 24, so there are many opportunities for compressed air to be discharged through the dryer 24, and the dryer 2
4 can be fully reproduced. Of course, when raising the height of either the front or rear of the vehicle and lowering the other, it is possible to raise and lower the vehicle at the same time, so compressed air can be supplied and discharged at the same time. Vehicle height adjustments can also be made quickly.

(Effects of the Invention) As is clear from the above description, the present invention supplies compressed air to either one of the vehicle height adjustment body on the front side of the vehicle body and the vehicle height adjustment body on the rear side of the vehicle body, and simultaneously supplies compressed air from the other side. Since the compressed air can be discharged, the time required for adjusting the vehicle height, which involves raising and lowering the vehicle height at the front and rear of the vehicle, can be greatly reduced.

Moreover, since the compressed air is designed to have many chances to be discharged through the dryer, the dryer can be regenerated frequently and the compressed air can be sufficiently dried by the dryer.

[Brief explanation of drawings]

FIG. 1 is a diagonal diagram showing an embodiment of the present invention. FIG. 2 is a circuit diagram of the embodiment shown in FIG. Vehicle body 2 to 5: Wheels 6 to 9; Pneumatic spring device (vehicle height adjustment body) 11: Diaphragm 12: Gas chamber 21: Compressor (compressed air source) 23a: Pneumatic passage 23b: Dedicated passage section (pneumatic passage system for front wheels) ) 23C: Dedicated passage section (pneumatic passage system for rear wheels) 24: Dryer 25: Common exhaust valve 27: Exhaust valve dedicated for front wheels 29: Exhaust valve dedicated for rear wheels 26.28: Open/close valve (for intermittent front and rear wheels) 4 Engineering: Control unit 42.43: Vehicle height sensor 46: Vehicle height selection switch

Claims (1)

[Claims] (1) A vehicle height adjustment body disposed between the wheels and the vehicle body that changes the vehicle height according to the supply and discharge of compressed air, and a dryer connected to a pneumatic passage connecting the vehicle height adjustment body and a compressed air source. A vehicle height adjustment device for a vehicle, comprising: a front and rear wheel common exhaust valve connected to a pneumatic passage between the compressed air source and the dryer and configured to discharge compressed air from each of the vehicle height adjustment bodies for the front and rear wheels; a front wheel dedicated exhaust valve that discharges the compressed air in the vehicle height adjustment body on the front wheel side; a rear wheel dedicated exhaust valve that discharges the compressed air in the vehicle height adjustment body on the rear wheel side; and a front wheel air pressure in the air pressure passage. An opening/closing valve for connecting and disconnecting the passage system and the rear wheel pneumatic passage system, and controlling each of the above valves independently to discharge compressed air in each vehicle height adjustment body for the front and rear wheels, and for the front wheels. a control means for discharging compressed air from the front and rear wheels common exhaust valve when compressed air is discharged from only one of the vehicle height adjustment body and the rear wheel vehicle height adjustment body and the compressed air is not supplied to or discharged from the other; A vehicle height adjustment device for an automobile, comprising: .