JPH086573Y2 - Car suspension equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a vehicle suspension device such as an air suspension interposed between a wheel side member and a vehicle body side member.

(Prior Art) Conventionally, as a suspension device for an automobile of the above-mentioned example, for example, there is a device described in Japanese Utility Model Laid-Open No. 59-11751.

As shown in FIG. 5, this conventional device is provided with a shock absorber 51, 51 interposed between a wheel side member and a vehicle body side member and the above-mentioned shock absorbers 51, 51. Main air chamber 53 with variable volume defined by 52 and 52
A sub air chamber 54, 54, an air intake / exhaust passage 55 that connects the sub air chambers 54, 54 provided in the shock absorbers 51, 51 arranged on the left and right wheels to each other, and pressurized air. Air compressor as a source
56 and a vehicle height adjusting mechanism 58 having a control valve 57 that controls the intake and exhaust of air to and from each of the sub air chambers 54, 54 by opening and closing, and the main air chamber 53 described above. A spring constant switching mechanism 61 having an opening / closing valve 60 for switching the spring constant by being provided in a communication passage 59 connecting to the sub air chamber 54 and connecting or disconnecting the communication passage 59 is provided. Extension paths 62,6 that extend the tips of the intake and exhaust passages 55
An air suspension device in which 2 is connected to the left and right main air chambers 53, 53.

Then, in this conventional air suspension device, when the left and right on-off valves 60, 60 are opened, the pressurized air from the air compressor 56 is passed through the control valve 57, the air intake / exhaust passage 55, and the extension passage 62. While adjusting the vehicle height by sucking / exhausting to / from the main and sub air chambers 53, 54, when the left and right open / close valves 60, 60 are closed, the pressurized air from the air compressor 56 is supplied to each element 57, 55, The vehicle height is adjusted by sucking and exhausting only into the main air chamber 53 via 62, and the spring constant is variably controlled in response to the opening and closing of the on-off valves 60, 60 described above.
Open 0, 60 to soften, and open / close valve when cornering
It is configured to close 60, 60 and make it hard.

However, the conventional device described above has the following problems.

That is, the left and right sub air chambers 54, 54 are connected to the air intake / exhaust passage 55.
The above-mentioned on-off valves 60, 60 are connected to each other by
When cornering to turn in a closed hard state, an external force F is applied to a wheel located on the outside of the turn, for example, the right wheel in FIG. 5, and the pressurized air in the right main air chamber 53 is extended. It flows into the left main air chamber 53 through the passage 62 and the air intake / exhaust passage 55.

As a result, there has been a problem that the vehicle body excessively leans toward the outer side of the turning at the time of cornering and the sinking at the time of turning becomes large.

(Object of the Invention) This invention has a simple control and configuration, can maintain a constant pressure between the left and right in a steady state, can prevent an excessive inclination during cornering, and can also adjust the vehicle height. The purpose is to provide a possible vehicle suspension device.

(Structure of the Invention) This invention is a shock absorber interposed between a wheel side member and a vehicle body side member, and is disposed above the shock absorber, and at least a part of the shock absorber is defined by a bellows to change the volume. A spring device composed of a main chamber and a sub chamber, a fluid intake / exhaust passage for connecting the sub chambers to each other, which are arranged on the left and right wheels, a fluid intake / exhaust passage and a pressure source. And a vehicle height adjusting mechanism including a control valve that is opened and closed to control intake and exhaust of fluid to and from the sub chambers, and a first communication passage that connects the main chamber and the sub chamber. , The first
An opening / closing valve that is provided in the communication passage and opens and closes the passage, and a second communication passage that always communicates the main chamber and the sub chamber are provided, and the area of the second communication passage is such that the first communication passage is in an open state. The suspension device for an automobile is set smaller than the passage area when

(Effect of the Invention) According to the present invention, the left and right sub-chambers are connected to each other through the fluid suction and discharge passages to form the left and right integrated control type, so that the control and the configuration are simple and the pressure between the left and right is steady. Sometimes it can be constant.

Moreover, the following effects can be obtained in the suspension device for the left and right integrated control type automobile.

That is, the above-mentioned second communication passage is configured by, for example, an orifice, or the second communication passage is configured by providing a valve having a small fluid resistance with a valve that opens and closes in conjunction with the control valve. Even when an external force is applied to the wheels located on the outside of the turn during cornering when the turning valve is closed and the wheel is turning in a hard state, the fluid in the main chamber on the outside of the turn caused by this external force causes the fluid in the sub chamber and the fluid intake / exhaust passage. It is possible to prevent the gas from flowing into the main chamber on the inside of the turn via the.

As a result, it is possible to prevent an excessive inclination during cornering.

Further, the vehicle height adjustment under the above-mentioned hard condition is performed through the second communication passage constituted by the above-mentioned orifice or the second communication passage constituted by a passage having a small fluid resistance provided with a valve interlocking with the control valve. It can be done easily.

In short, the main chamber having a variable volume structure and the sub chamber having a constant volume structure are communicated with each other by the first communication passage provided with an opening / closing valve and the second communication passage having a small passage area, and the fluid intake / exhaust passages are connected to the left and right. By connecting to each sub-chamber, in the suspension device for a vehicle of the left-right integrated control type, there is an effect that the vehicle height can be easily adjusted when the hardware is selected while preventing an excessive inclination during cornering.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

The drawing shows a suspension system of an automobile, and FIG.
In FIG. 2, this air suspension device is interposed between a wheel side member and a body frame 1 as a vehicle body side member, and has a shock absorber 4 having a piston rod 2 and a strut bar 3, and an upper portion of the shock absorber 4. And a sub-tank 7 as a sub-chamber formed on the main tank 6 and a main chamber 6 partly defined by a bellows 5 so that the volume can be changed. The device, an air intake / exhaust passage 8 interconnecting the above-mentioned sub-tanks 7, 7 provided in the respective shock absorbers 4, 4 arranged on the left and right wheels, an air compressor 9 as a pressurizing source, A control valve 10 is provided between the air intake / exhaust passage 8 and the air compressor 9, and the opening / closing operation of the control valve 10 controls the intake / exhaust of the pressurized air to both the sub tanks 7, 7. The vehicle height adjusting mechanism 11, the first communication passage 12 that connects the main tank 6 and the sub-tank 7 described above, and the electromagnetic solenoid valve 13 as an opening / closing valve that opens and closes the first communication passage 12 are provided. A sub-tank is formed inside the plunger 15 of the electromagnetic solenoid valve 13 and the spring constant switching mechanism 14 that switches the spring constant of the spring device by opening and closing the first communication passage 12 described above by the valve 13. 7 and the main tank 6 are communicated with each other, and an orifice 16 as a second communication passage independent of the first communication passage 12 is provided.

Here, the main tank 6 has a bellows 5 disposed between an outer shell 17 having a lower end fixed to the outer periphery of the strut bar 3 and an inner shell 18 having an upper end fixed to the outer periphery of the piston rod 2, and the volume thereof can be changed. Is configured.

Further, while the magnet 20 is arranged on the strut bar 3 via the bracket 19, the proximity switch 22 is arranged on the inner shell 18 via the bracket 21, and the vehicle height is increased by the proximity switch 22 and the magnet 20. The sensor 23 is formed.

Further, a bump stop rubber 24 is arranged in the main tank 6 described above, and the bump stop rubber 24 is configured to stop a large load above a predetermined level.

The sub-tank 7 is surrounded by a tank housing 25 made of a hard material such as metal and the inner shell 18 described above, and the electromagnetic solenoid valve 13 is attached to one side of the inner shell 18.

Then, in a part of the inner shell 18 facing the plunger 15 of the electromagnetic solenoid valve 13, the upper and lower tanks 7, 6 are formed.
The above-mentioned first communication passage 12 that communicates with each other is bored.

By the way, while the rod 27 for controlling the damping force operated by the actuator 26 is inserted into the piston rod 2 described above, the pressurized air from the air compressor 9 described above is supplied to the control valve 10, the air intake / exhaust passage 8, Air passage 29 in the actuator mounting bracket 28, air passage in the piston rod 2
30, the air is supplied to the sub tank 7 through the air passage 32 in the passage block 31.

On the other hand, an elastic rubber 35 held by the outer cylinder 33 and the inner cylinder 34 is provided between the tank housing 25 and the actuator mounting bracket 28, and the outer cylinder 33 of the elastic rubber 35 is described above with the bolt nut 36. The inner cylinder 34 is mounted on the body frame 1 of the piston rod 2 through the bearing 37.
It is installed on the upper part of.

The electromagnetic solenoid valve 13 has an exciting coil 39 inside the valve housing 38 as shown in FIGS. 3 and 4, and when the exciting coil 39 is energized, the plunger 15 is projected against the return spring 40. A seal member 41 is integrally attached to the tip of the plunger 15 by the valve.

And, the above-mentioned orifice 16 as the second communication passage,
It is formed so as to penetrate the plunger 15 and the seal member 41 described above.

Here, the orifice 16 whose passage area is set to be smaller than the passage area of the first communication passage 12 is a fixed throttle having a small diameter in the upper portion and a large diameter in the lower portion. When adjusting the vehicle height at the time of handling, pressurized air flows in the direction of arrow a in the figure, and when increasing the vehicle height, the air is made easier to flow to shorten the adjustment time and in the direction of arrow b in the figure. When the vehicle height is lowered by removing the pressurized air to the air, it is made difficult for the air to flow and the vehicle descending speed is slowed.

The illustrated embodiment is configured as described above, and the operation will be described below.

When cornering to turn the vehicle in a hard state by operating the solenoid solenoid valve 13 as shown in FIG. 4,
An external force is applied to the wheels located on the outside of the turn, and the air in the main tank 6 tends to compress due to this external force. The second communication passage that connects the main tank 6 and the sub tank 7 has a large fluid resistance. Since the orifice 16 is used, the air in the main tank 6 on the outside of the turn can be suppressed from flowing into the main tank 6 on the inside of the turn via the sub tank 7 and the like.

As a result, there is an effect that it is possible to prevent an excessive inclination of the vehicle body during cornering.

Moreover, in order to adjust the vehicle height under the hard condition shown in FIG. 4, the control valve 10 of the vehicle height adjusting mechanism 11 is opened and the compressed air of the air compressor 9 is fed to the air intake / exhaust passage 8 This can be easily performed by sucking and discharging the main tanks 6, 6 through the sub tanks 7, 7 and the left and right orifices 16, 16.

In short, the main chambers 6 having a variable volume structure and the sub chambers 7 having a constant volume structure are provided with the first communication passage 12 provided with the opening / closing valve 13.
And the second communication passage 16 having a small passage area, and the fluid suction / discharge passage 8 is connected to the left and right sub-chambers 7, 7,
In the left-right integrated control type vehicle suspension device, there is an effect that the vehicle height can be easily adjusted when the hardware is selected while preventing an excessive inclination during cornering.

Of course, when the first communication passage 12 is opened by the electromagnetic solenoid valve 13 described above, the spring constant of the above-mentioned spring device is switched to the soft state as shown in FIG.

Further, as shown in the embodiment, when the orifice 16 is formed in the plunger 15 of the electromagnetic solenoid valve 13, the fluid resistance can be easily set by the orifice 16.

In the correspondence between the configuration of the present invention and the above-described embodiment, the vehicle body side member of the present invention is the body frame 1 of the embodiment.
Similarly, the main chamber corresponds to the main tank 6, the sub-chamber corresponds to the sub-tank 7, the fluid intake / exhaust passage corresponds to the air intake / exhaust passage 8, and the pressure generation source corresponds to the air compressor 9. Correspondingly, the open / close valve corresponds to the electromagnetic solenoid valve 13 and the second communication passage corresponds to the orifice 16. However, the present invention is not limited to the configuration of the above-described embodiment.

[Brief description of drawings]

1 is a schematic system diagram showing an automobile air suspension device of the present invention, FIG. 2 is a sectional view showing one side of the air suspension device of the present invention, and FIG. 3 is a sectional view of an electromagnetic solenoid valve in a soft state. FIG. 4 is a sectional view of an electromagnetic solenoid valve in a hard state, and FIG. 5 is a schematic system diagram of a conventional air suspension device. 1 ... Body frame 4 ... Shock absorber 5 ... Bellows 6 ... Main tank (main chamber) 7 ... Sub tank (sub chamber), 8 ... Air intake / exhaust passage 9 ... Air compressor, 10 ... Control valve 11 …… Vehicle height adjustment mechanism, 12 …… First communication passage 13 …… Electromagnetic solenoid valve (open / close valve) 15 …… Plunger 16 …… Orifice (second communication passage)

Continuation of the front page (56) References Open 59-50810 (JP, U) Open 60-72307 (JP, U) Open 59-137806 (JP, U) Open 57-176310 (JP) , U) Actually open 60-38808 (JP, U) Actually open 58-95310 (JP, U)

Claims (2)

[Scope of utility model registration request] 1. A shock absorber (4) interposed between a wheel side member and a vehicle body side member (1), and a shock absorber (4) disposed at an upper portion of the shock absorber (4), at least a part of which is a bellows (5). A spring device composed of a main chamber (6) whose volume is variable and a sub chamber (7), and the sub chambers (7, 7) arranged on the left and right wheels are connected to each other. Fluid intake / exhaust passage (8), which is provided between the fluid intake / exhaust passage (8) and the pressurizing source (9), and is opened / closed to open and close the fluid to the sub chambers (7, 7). A vehicle height adjusting mechanism (11) including a control valve (10) for controlling intake and exhaust of the first chamber, a first communication passage (12) communicating the main chamber (6) and the sub chamber (7), and An on-off valve (13) provided in the communication passage (12) for opening and closing the passage (12), and a second communication passage (16) for constantly communicating the main chamber (6) and the sub chamber (7). To The vehicle suspension device, wherein the area of the second communication passage (16) is set to be smaller than the area of the passage when the first communication passage (12) is open. 2. The suspension of an automobile according to claim 1, wherein the second communication passage (16) is formed inside a plunger (15) of an opening / closing valve (13) composed of an electromagnetic solenoid valve. apparatus.