JPH0228963Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vehicle height adjustment device in which a desiccator and an accumulator are provided in a pneumatic circuit connecting a compressor and a suspension unit.

Conventionally, vehicle height has been adjusted by adjusting the air pressure of the suspension unit in order to improve the running stability of the vehicle by adjusting the vehicle height according to the vehicle speed and the amount of load on the vehicle. A vehicle height adjustment device is provided.

FIG. 1 is a pneumatic system diagram of such a conventional vehicle height adjustment device. First, a compressor 1 is driven by a motor 2, and a discharge passage 3 of the compressor 1 is connected to a check valve 4, a relief valve 5, and a desiccator 6 as shown.

Further, an air supply valve 7 is connected to the discharge passage 3 on the downstream side of the desiccator 6, and the air supply valve 7 is branched into two supply and exhaust passages 8 and 9 on the downstream side thereof.

Branch passages 12, 13 and 14, 15 are connected to the supply/exhaust passages 8, 9, respectively, via a front supply/exhaust valve 10 and a rear supply/exhaust valve 11. Note that 16 and 17 are accumulators connected to each of the branch portions.

18 and 19 are front suspension units connected to the ends of branch passages 12 and 13; 20 and 21;
is a rear suspension unit connected to the ends of the branch passages 14 and 15.

22, 23, 24, 25 are each branch passage 12, 1
This is a volume cut valve connected to ports 3, 14, and 15.

On the other hand, an exhaust valve 26 is connected to an exhaust passage 28 that branches off from the middle of the supply/exhaust passage 8 upstream of the front supply/exhaust valve 10 .

In addition, each of the above-mentioned valves 7, 10, 11, 26, 22,
The operations of 23, 24, and 25 are controlled by a control signal current from a control unit 27 based on the vehicle speed, vehicle height, and other detected data.

In the vehicle height adjustment device having such a configuration, the compressor 1 is operated by a control signal output from the control unit 27, and the air supply valve 7, the front supply and exhaust valve 10, and the rear supply and exhaust valve 11 are opened. At this time, after drying the air compressed by compressor 1 in desiccator 6, each accumulator 16, 1
Front suspension unit 1 via 7
8, 19 and rear suspension unit 2
0,21. As a result, the vehicle height increases.
On the other hand, based on the output of the control unit 27, the front and rear intake and exhaust valves 10, 11,
When each exhaust valve 26 is opened, the air in each suspension unit 18, 19, 20, 21 is exhausted to the atmosphere through each of the above-mentioned valves 10, 11, 26. This lowers the vehicle height. The vehicle height can be adjusted in this way.

In addition, the volume cut valves 22, 23, 2
The attitude of the vehicle can be controlled by selectively controlling the operation of some of the parts 4 and 25.

However, in such a vehicle height adjustment device, since the desiccator 6 is connected between the compressor 1 and the air supply valve 7, the desiccator 6 directs the air from the compressor 1 to each suspension unit 18, 19, 20. , 21, the dehumidifying effect is insufficient, and the suspension units 18, 1
There was a drawback that water gradually accumulated inside 9, 20, 21 and at the bottom of the system circuit.

In addition, the vehicle has the above-mentioned accumulator 16,1.
7 etc., each suspension unit 1
It is necessary to separately provide volume cut valves 22, 23, 24, and 25 for each of 8, 19, 20, and 21, which has the disadvantage that the installation work becomes troublesome and the installation structure to the vehicle body becomes complicated. .

This invention solves these drawbacks,
By combining the desiccator and volume cut valve into an accumulator, it is possible to dry the air entering and exiting the suspension unit more effectively, and to simplify the installation work and the installation structure on the vehicle body. This is the purpose.

In order to achieve this objective, the present invention includes an air drying desiccator, an accumulator, and an attitude control system in the supply/exhaust passage connecting the compressor and a plurality of suspension units that extend in response to the supply of air pressure from the compressor. In the vehicle height adjustment device connected to the volume cut valve for
The desiccator and volume cut valve are installed within the accumulator.

The present invention will be specifically described below with reference to examples.

FIG. 2 is a pneumatic system diagram explaining one embodiment in detail, and the same components as those shown in FIG. 1 are given the same reference numerals.

In this embodiment, the air supply valve 7 shown in FIG. 1 is omitted, and the upstream sides of the air supply and exhaust valves 10 and 11 in the air supply and exhaust passages 8 and 9 are independently connected to the exhaust valve 26. By omitting the desiccator 6 and volume cut valves 22, 23, 24, 25 connected as shown in FIG. They were accommodated in accumulators 16A, 17A connected to passages 12, 13 and 14, 15.

FIG. 3 shows an accumulator 16 that integrally accommodates a desiccator 6A and volume cut valves 22 and 23.
This is a concrete example of A. Note that the other accumulator 17A has a similar configuration. In FIG. 3, the above accumulator 1
6A is a cylinder 31 and a thick closing plate 3 that closes both ends of the cylinder 31 via sealing materials 32 and 33.
4 and 35, and the inside thereof functions as a pressure accumulating part P.

The desiccator 6 is disposed between the closing plates 34 and 35.
A is straddled. This desiccator 6A includes a long tube 36 and two perforated plates 3 provided inside the long tube 36.
7, 38, and a desiccant 41 accommodated between the perforated plates 37, 38 via filters 39, 40, one of the perforated plates 37 being secured to a protruding edge provided on the long tube 36. , the other porous plate 38 is the filter 4
The desiccant 41 is now able to slide in the long cylinder 36 along with the desiccant 41, and the spring 42 interposed between it and the closing plate 35 biases the desiccant 41 in the direction of compressing it.
This improves the contact between the desiccant 41 and air.

The long cylinder 36 is provided at one end with a through hole 43 that communicates with the pressure accumulation part P, and the other end opening is provided within the wall thickness of the closing plate 35 to introduce compressed air from the air supply and exhaust passage 8. It communicates with the entrance 44.

Reference numerals 45 and 46 are air inlets and outlets for compressed air that are provided within the respective wall thicknesses of the closing plates 34 and 35 and communicate with the branch passages 12 and 13, and these air inlets and outlets 4
5 and 46 become thinner at the portion facing the inner surface of each of the closing plates 34 and 35, and the area around the opening end is located near the valve seat 4.
7.48.

Reference numerals 22 and 23 are the volume cut valves, and the ends of these movable rods 49 and 50 are connected to the valve seat 4.
Valve bodies 51 and 52 are connected to and separated from the air inlet and outlet ports 7 and 48 and open and close the air inlet and outlet ends 45 and 46, respectively.

53, 54 and 55, 56 are movable rods 49, 5
a volume cut valve 22 surrounding 0 at regular intervals;
The cylindrical portion on the 23 side has an orifice 5 communicating with the pressure accumulating portion P and each air inlet/outlet 45, 46.
7, 58 and 59, 60 are formed.

Reference numerals 61 and 62 are spring seats protruding from the outer periphery of the movable rods 49 and 50, and these and the respective cylindrical portions 54 and 5
6, the valve bodies 51 and 52 are connected to the valve seat 4.
Compression springs 63 and 64 are interposed to urge the elements 7 and 48 away from each other. Lead wires 65 and 66 connect each volume cut valve 22 and 23 to the control unit 27.

In the accumulator 16A having such a configuration, the compressor 1 is operated based on the output signal of the control unit 27, and the compressed air sent from the compressor 1 is sent to the air inlet 44 via the supply/exhaust valve 10 and the supply/exhaust passage 8. be introduced.
Further, this compressed air passes through the perforated plate 38, filter 40, desiccant 41, filter 39, perforated plate 37, and through hole 43 that constitute the desiccator 6A, and is dried. Pressure is accumulated in

Subsequently, the compressed air accumulated in this pressure accumulation chamber P flows from each air inlet/outlet 45, 46 through orifices 57, 58 and 59, 60 to each branch passage 12, 1.
3, the suspension unit 18,
19, and the vehicle height increases.

Conversely, the output of the control unit 27 causes the compressor 1 to stop operating and the supply/exhaust valve 10 to stop.
When the exhaust valve 26 is opened, the compressed air in the suspension units 18, 19 is discharged to the branch passages 12, 13, the air inlet/outlet 4, etc. due to the contraction operation of the suspension units 18, 19 due to the vehicle load.
5,46, orifice 58,57 and 60,5
9, it flows backward through the pressure accumulator P and the desiccator 6A while being subjected to a drying action, and is sent out to the air supply/exhaust passage 8. Further, a portion of the compressed air thus sent out is exhausted to the atmosphere through the exhaust valve 26.

In addition, a part of the air that is dried by flowing back through the desiccator 6A in this manner is supplied to the suspension units 18 and 19 again through the desiccator 6A during the next vehicle height raising process, so that the compressed air is Drying efficiency is further improved.

In addition, in FIG. 3, when one or both of the suspension units 18, 19 is stopped in order to control the attitude of the vehicle body, one or both of the volume cut valves 22, 23 are operated by the control unit. 27 and presses either the valve body 51 or 52 against the valve seat 47 or 48, respectively, and the pressure accumulator P and the branch passage 1
Communication with 2 and 13 is cut off.

In this way, compared to the conventional accumulator,
By housing the desiccator and the volume cut valve integrally, the number of parts to be attached to the vehicle body can be reduced, making the construction and assembly easier, and increasing the compressed air dehumidification effect. Therefore, the accumulation of moisture in the suspension units 18 and 19 is eliminated, and normal operation of these units is ensured.

In the above, the supply and exhaust systems of the suspension units 18 and 19 have been described, but the supply and exhaust systems of the suspension units 20 and 21 have exactly the same structure and function.

Furthermore, in the above case, by installing the exhaust valve 26 and the air circuit upstream of the exhaust valve 26 at the lowest part of the device, the moisture inside the circuit can be effectively discharged to the outside of the system during exhaust. be.

As described in detail above, according to the present invention, it is possible to increase the desiccator effect and to reduce the number of parts and assembly work of the vehicle height adjustment component to the vehicle body. As a result, it is possible to completely prevent moisture from accumulating within the suspension unit, and it is possible to achieve effects such as being able to reduce costs.

[Brief explanation of the drawing]

Figure 1 is a pneumatic system diagram of a conventional vehicle height adjustment device.
Figure 2 is a pneumatic system diagram of the vehicle height adjustment device of the present invention.
FIG. 3 is a sectional view of the accumulator as well. 1...Compressor, 6A...Desicator, 1
6A, 17A...Accumulator, 18,1
9, 20, 21...Suspension unit, 2
2, 23... Volume cut valve, 31... Cylinder, 32, 33... Seal material, 34, 35... Closing plate, 44... Air inlet.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In the supply and exhaust passage connecting the compressor and the plurality of suspensions that extend by receiving air pressure from the compressor, there is a desiccator for air drying and a volume cutter for controlling the vehicle body attitude. A vehicle height adjustment device characterized by connecting an accumulator (with a built-in valve). (2) The vehicle height adjustment device according to claim 1, wherein the accumulator is comprised of a cylinder and a closing plate that closes both open ends of the cylinder via a sealing material. (3) The desiccator consists of a long cylindrical body filled with desiccant material and one open end communicating with an air inlet provided within the wall thickness of the closing plate.
Vehicle height adjustment device described in section.