JPS6194807A - Car height regulating device - Google Patents

Abstract

PURPOSE:To improve operability and to perform rapid and accurate operation, by a method wherein a control valve and a switching valve are additionally located to a piping having a levelling valve and a relief valve. CONSTITUTION:Pressurized air, with which an air tank 26 is filled through the working of an air compressor 30, is fed to a pneumatic spring 29, supporting longitudinal and lateral wheels, through a piping 64, a levelling valve 27, a piping 65, a relay valve 50, and pipings 66 and 67. A switching valve 28 is located between the pipings 66 and 67, the switching valve 28 is automatically switched by means of the pressure of the tank 26 to feed the pressurized air to the pneumatic spring 29 through the pipings 62 and 67. The relay valve 50 is actuated by means of the pressure of the tank 26 to close the piping 65, and the pressurized air is released to the open air from the valve 50 through the pipings 67 and 66. Such switching motion causes connection of a control valves 25 to the tank 26 through a piping 61 to control a control lever 2 of the control valve 25.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle height adjustment device for a vehicle equipped with an air spring suspension system.

[Prior Art] In vehicles equipped with an air spring suspension system, changes in vehicle height are automatically restored to a predetermined height by the action of a leveling valve, but there is a leveling valve that automatically restores the vehicle height to a specified height. It is required to be able to change the height of the vehicle depending on getting on and off, loading and unloading cargo, road conditions, etc.

Conventionally, in response to these demands, there has been a system that locks the operation of the leveling valve when adjusting the vehicle height and operates an electromagnetic switching valve to connect the air spring to the air tank or the atmosphere. Things are slow-moving and take a lot of time. In addition, all air springs require switching devices and corresponding auxiliary air piping.
It becomes very complicated. On the other hand, Utsukai 51-
Although some devices are disclosed in Publication No. 77719@, there are still problems to be solved such as reliability and operability regarding the piping switching device.

[Problem that the invention seeks to solve]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a vehicle height w14 adjustment device that has a high operability and reliability of a vehicle height adjustment control valve and can quickly change the vehicle height.

Means for Solving the L Problems In order to achieve the above object, the present invention has a configuration in which an air tank is communicated with an air splash via a vehicle height adjustment device consisting of a leveling valve and a relay valve, and a switching valve. the air tank is connected to the air spring through the switching valve in a first operating position of the control valve, and connected to the relay valve in a second operating position to connect the air spring to the switching valve and the relay. The vehicle height can be adjusted to any desired height by opening it to the atmosphere through a valve.

[Function] When the operating lever 2 is tilted to the left, the pressure in the air tank 26 is applied to the switching valve 28 via the piping 62, and this switching valve 28
The pipes 62 and 67 are connected, and pressurized air is sent to the air spring 29, raising the vehicle height. Conversely, when the operating lever 2 is tilted to the right, the pressure in the pipe 63 is reduced, and at the same time, the relay valve 50 is operated, and the air in the air spring 29 is transferred to the pipe 67.
．． 66 and is released into the atmosphere from the relay valve 5o, lowering the vehicle height. In this way, independently of the action of the leveling valve 27, any desired vehicle height can be quickly and easily obtained on the operating valve of the llIIJwJ valve 25.

[Examples of the Invention] The present invention will be described based on Examples. As shown in FIG. 1, the air is compressed by a pipe 64, a well-known leveling valve 27, and a pipe 6.
5. Relay valve 50r! The air is sent through three pipes 66 and 67 to air springs 29 that support the front, rear, left and right wheels. Such a configuration is similar to that of conventional air spring suspension systems.

According to the present invention, the switching valve 28 is provided between the pipes 66 and 67, and the switching valve 2B is switched by itself by the pressure of the air tank 26, and pressurized air is sent to the air spring 29 via the pipes 62, 67, or Relay valve 5 is activated by the pressure of air tank 26.
0 is activated to close the pipe 65, and the air from the two air springs can be released from the relay valve 50 to the atmosphere through the pipes 67 and 66. In order to perform such a switching operation, the control valve 25 is connected to the air tank 26 via a pipe 61, and the 11i! When the operating lever 2 of the In'll valve 25 is turned to the left from the neutral position [n, the pipes 61 and 62 are connected, and when the control lever 2 is turned to the right, the pipes 61 and 63 are connected. .

As shown in FIG. 2, the control valve 25 has a shaft portion 1 extending left and right.
The housing 2 is airtightly supported by a pair of left and right housings 2 so as to be rotatable around the housing 2 . The left housing 3 is provided with a large diameter cylinder 5 and a small diameter cylinder 15 coaxially, and a shaft portion 12 is rotatably supported on the end wall of the small diameter cylinder 15 via a seal member. This shaft portion 12 is provided with a bottle 9 that protrudes upward, and as shown in FIG.
When the piston is rotated in the direction of the arrow y, the pin 9 engages with a cam 10 formed on the edge of the piston 16, and the piston is rotated.

is configured to move the button 16 to the left. Conversely, when the pin 9 provided on the right side of the shaft portion 12 is engaged with the cam 10 of the piston 16 and the operating lever 2 is rotated to the opposite side,
The piston 16 is returned to the left from the illustrated state by the force of the spring 8.

In FIG. 2, the configuration of the left half portion will be described. The piston 4 is fitted into the cylinder 5 of the left housing 3, and the aforementioned piston 16 is fitted into the cylinder 15, respectively. The piston 5 has an annular groove on its outer peripheral surface and an inner cavity communicating with the annular groove through a radial passage 6. This inner space is provided with a cylindrical portion 23 on the left end into which the hollow valve body 13 is fitted, and a valve seat 18 on the right end with which the valve body 13 is engaged. The piston 4 is biased to the right by a spring 24 interposed between the left ml of the housing 3, and is pressed against the stepped portions of the cylinders 5 and 15.

Further, the valve body 13 is pressed against the valve seat 18 by a spring 22 interposed between the valve body 13 and the end wall of the cylinder 5. The piston 16 is provided with a through hole 14, and the seedlings on both sides of the piston 16 are communicated with each other. A cam 10 of the piston 16 is engaged with the pin 9 by a spring 8 interposed between the pistons 4 and 16.

When the piston 16 is pushed to the left, the rod 7 that projects from the piston 16 toward the valve body 13 is configured to push the valve body 13 away from the valve seat 18.

The housing 3 is provided with ports 21.61a and 62a, and the port 21 always opens the chamber between the piston 4 and the left end wall of the cylinder 5 to the atmosphere.

A port 61a communicating with the inner space of the piston 4 is communicated with the air tank 26 via a pipe 61, as shown in FIG. Boat 6 communicating with the seedlings between pistons 4 and 16
2a is connected to the switching valve 28 via a pipe 62 as shown in FIG.

The housing 3 on the right side of the control valve 25 is also provided with boats 21.61a, 63a in substantially the same way. A boat 63a corresponding to the boat 62a of the left housing 3 is connected to the relay valve 50 via a pipe 63, as shown in FIG.

The relay valve 5o is constructed as shown in FIG.

The lid 32 is coupled to the upper end surface of the main body 52 with bolts 33, with the diaphragm 36 in between. This diaphragm 36
Abutment plates 35 and 37 are placed on both sides of the diaphragm 36, and a nut 56 is screwed onto a rod 51 passing through these plates, so that the rod 51 is supported by the diaphragm 36. This rod 51 is slidably supported in the cylindrical portion 49 of the main body 52 with a gap. The diaphragm 36 is biased toward the lid 32 by a spring 55 housed in the cavity 38. A boat Q3a is provided on the upper side 34 divided by the diaphragm 36,
It is connected to the control valve 25 via piping 63 shown in FIG. Further, the chamber 38 on the lower side of the diaphragm 36 is connected to the cylindrical portion 4.
Continuing to 9. The cylindrical portion 4 has a valve seat 47 formed at its lower end, a boat 66a at its intermediate portion, and is connected to the switching valve 28 via a pipe 66 shown in FIG.

A split body 45 is coupled to the lower end of the main body 52 with a bolt 40, and this coupled portion is sealed by a seal member 48. A boat 65 is attached to the toe 42 formed on the main body 45.
a is provided and connected to the leveling valve 27 via the piping 65 shown in FIG. A valve body 39 that connects and disconnects the valve body 42 and the cylindrical portion 49 is pressed against the valve seat 47 by a spring 41. This valve body 39 has a hollow stem slidably supported in a shaft hole 46 of a divided body 45 via a seal member 43 . This shaft hole 46 is always in communication with the atmosphere port 44.

Next, the operation of the vehicle height adjustment device according to the present invention will be explained. When raising the vehicle height, in the second case, when the operating lever 2 is pushed down on the paper, that is, in the direction of arrow y in FIG. 3, the left piston 16 is pushed to the left by the left pin 9, and the The piston 16 does not move. Then, since the valve body 13 is pushed away from the valve seat 18 by the rod 7 of the piston 16, the inner space of the piston 4 and the chamber between the pistons 4 and 16 are communicated with each other. That is, the boat 61a is communicated with the Portoro 2a. Therefore, in FIG. 1, the pressurized air in the air tank 26 is supplied to the switching valve 28 via the piping 61, the switching valve 25, and the piping 62, closing the piping 66, and filling each air spring 29 via the piping 67. Ru. In this way, the vehicle height is adjusted according to the operating angle of the lever 2.

When the operating lever 2 is returned to the neutral position n shown in FIG. 2, the boat 62a is cut off from the boat 61a by the valve body 13.
It also communicates with the atmospheric boat 21.

The pressure in the pipe 62 is released to the atmosphere, the switching valve 28 is returned to the position shown in FIG. of air is exhausted and returned to a predetermined height.

Next, when lowering the vehicle height than a predetermined height, the second
When the operating lever 2 is tilted toward you at @, that is, in the direction opposite to the arrow y in FIG. When the body 13 engages with the valve seat 18 by the force of the spring 22, the boat 63a is communicated with the atmospheric boat 21 through the hollow valve body 13. In Figure 4, chamber 3
When the pressure at °4 becomes atmospheric pressure, the diaphragm 36 is pushed up by the force of the springs 55, the rod 51 separates from the valve body 39, the valve body 39 seats against the valve seat 47, and the boat 66a It communicates with the atmosphere port 44 through the hollow portion of the cylindrical body 49 and the valve body 39 . Therefore, the air in the air splash 29 shown in FIG.
6. It is discharged to the outside through the four cylindrical parts of the boat 66a1 of the relay valve 50 shown in FIG. When the vehicle height reaches the desired height, when the operating lever 2 is slightly returned (from position C to d in Figure 1), the piston 1 on the right side in Figure 2
6 is pushed back to the right, and - this rod 7 hits the valve body 13 and is pushed away from the valve seat 18. In this way, boat 63
a is communicated with the boat 61a, so that the pressurized air in the air tank 26 in FIG.
a, the diaphragm 36 is pushed down and the rod 51 stops when it hits the valve body 39. Therefore, the space between the boat 66a and the air vent 44 is closed, and the vehicle height is maintained at that height.

When the operating lever 2 is returned to the neutral position n, the boat 63a is cut off from the atmospheric boat 21 and communicated with the boat 61a as shown in FIG. 61, through the control valve 25I3 and the piping 3, is supplied from the boat 63a of the relay valve 50 shown in FIG. Therefore, leveling valve 2
7! The pressurized air in the air tank 26 passes through the piping 64, the leveling valve 27, and the piping 65, and flows from the boat 65a of the relay valve 50 shown in FIG.
The air is supplied from the boat 66a to each air spring 29 via the piping 66, the switching valve 28, and the piping 67, and the vehicle height is restored to a predetermined height.

FIG. 5 shows an embodiment of an air spring type suspension system in which a leveling valve 27 and a relay valve 50 are arranged separately for the air spring 29 of the left wheel and the air spring 29a of the right wheel. Naturally, the switching valves 28 are also arranged separately.

In the embodiment shown in FIG. 6, the left wheel air spring 19.2
9 and the air springs 19a and 29a of the right wheel, the vehicle height can be adjusted separately. The leveling valve 27 and the relay valve 50 are each connected to the air spring 19
．． 29 and the air springs 19a, 29a are separately arranged, and the control valve 25I5 and the switching valve 28 are also separately provided on the left and right sides. These operations are similar to those shown in FIG. 1, but for example, by operating the right control valve 25, the pressurized air in the air tank 26 is transferred to the pipe 61, the control valve 25, the pipe 62, and the switching valve. 28 and piping 6
The air is supplied to the air springs 19a and 29a through 7A, and the entire vehicle body can be tilted to the left.

In addition, as shown in FIG. 7, the air springs 19 for the left and right front wheels are
．． By changing the connections of the piping 67 to the air springs 19a and the piping 67A to the left and right rear air springs 29.29a,
The entire vehicle body can be tilted forward or backward.

The embodiment shown in Fig. 8 is constructed so that the vehicle body can be selectively tilted left and right and front and back as described in Figs. At the end of the sixth
A relay valve 50a which can be switched between the piping as shown in the figure and the piping as shown in FIG. 7 is connected respectively. In normal driving, the relay valve 50a is operated in substantially the same way as the relay valve 5o by air pressure applied from the air tank 26 through the pipe 64A, and from the pipe 67 to the air spring 19.29 of the left wheel via the pipe 68, and the pipe Air springs 19a and 29a for the right wheel are connected from 67A to pipe 68A.
Pressurized air 7j is sent to each of the air springs 7j, or conversely, the air in the air springs is released to the atmosphere to automatically maintain a predetermined vehicle height. An electromagnetic switching valve may be used in place of the relay valve 50a, but if a solenoid is attached to the relay valve 50 described above to electrically operate the rod 51, common parts can be used. This has the advantage that even if a failure occurs in the electrical system, the vehicle height adjustment function during normal driving will not be impaired.

[Effects of the Invention] As described above, the present invention merely adds a control valve and a switching valve to the piping equipped with a leveling valve and a relay valve that are employed in a general air spring type suspension system. Therefore, the configuration is simple, and the control valves are configured symmetrically with respect to raising and lowering the vehicle height, which helps reduce manufacturing costs.

In addition, it has excellent operability and operates quickly and accurately.
To provide a vehicle height adjustment device which does not require any electric device except for the embodiment shown in the figure and whose valves are all operated by pneumatic pressure, and which is easy to maintain and has high durability and reliability. I can do it.

[Brief explanation of drawings]

FIG. 1 is a piping diagram showing a schematic configuration of a vehicle height adjustment device according to the present invention, FIG. 2 is a front cross-sectional view of a control valve in the vehicle height adjustment device, and FIG. 3 is a plan view of an operating section of the control valve. Figure 4 is a front sectional view of the relay valve in the vehicle height adjustment device,
FIG. 5 is a piping diagram of a vehicle height adjustment device according to a second embodiment of the present invention, and FIGS. 6, 7, and 8 are a piping diagram of a vehicle height adjustment device according to a third embodiment of the present invention. It is a piping diagram of the vehicle height adjustment device based on the 4th and 5th Example. 2: Operation lever 4.16: Piston 5, 15 Niji cylinder 9: Pin 10: Cam 12: Shaft 13.39:
Valve body 18.47: Valve seat 19.19a, 29.29
a: Air spring 25: Control valve 26: Air tank 27
:Leveling valve 28:Switching valve 36:Diaphragm
44: Atmospheric port 50.50a: Relay valve Fig. 1 Fig. 2 Fan 3 Fig. t+→ Fig. 4 Fig. 5 Fig. 6 Fig. 7

Claims (1)

[Claims] The air tank is connected to the air spring through a vehicle height adjustment device including a leveling valve and a relay valve, and a switching valve, and the air tank is connected to the air spring via the switching valve in a first operating position of the control valve. While communicating with the relay valve, the air spring is connected to the relay valve at a second operating position to open the air spring to the atmosphere through the switching valve and the relay valve, thereby adjusting the vehicle height to a desired height. High adjustment device.