JPS59186718A - Suspension for automobile - Google Patents

Abstract

PURPOSE:To prevent a car level from turning into a sudden change, by connecting an air chamber of an air spring and a subtank chamber with three passages being provided jointly with an on-off valve, an orifice and a one-way valve and connected in parallel with each other. CONSTITUTION:An automotive suspension consists of an air spring by means of each air chamber 12 and a shock absorber 16 inclusive of a piston rod 18 being free of vertical sliding motion. And, these air chambers 12 and 12 of each suspension engaging with wheels at both sides are mutually interconnected through by an air pipe 23, while they are connected to a subtank 2A. Space between the air chamber 12 and the subtank 2A is connected via an air circulation control mechanism 31 which is constituted of first-third passages 32-34 being connected in parallel with one another. And, a solenoid on-off valve 35 is installed in the first passage 32, an orifice in the second passage 33 and a one-way valve in the third passage 34 respectively in a parallel manner, while the on-off valve 35 is made to be closed when making a select switch 3 into circuit, in time of running on a rough road.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a suspension system for a motor vehicle, and more particularly to a suspension system for a motor vehicle equipped with an air spring.

For this type of suspension, Japanese Patent Application Laid-Open No. 56-60
As shown in No. 710, a vehicle is known in which a desired reference vehicle height can be specified from among a plurality of reference vehicle heights by adjusting the introduction of air into an air chamber of an air spring.

According to this type of suspension, the vehicle height can be maintained at a height suitable for driving depending on the road condition, such as a paved road or a highly uneven mountain road, and it is possible to prevent the lower part of the vehicle body from coming into contact with the road. can. However, in the suspension described in the above-mentioned patent publication, when changing the vehicle height, air is introduced into the air chamber of the air spring all at once, and the vehicle height changes rapidly, so when driving on a mountain road, etc. Therefore, the object of the present invention is to provide an automobile suspension that can control the air springs so that the vehicle height does not change suddenly. be.

The automobile suspension of the present invention includes: an air spring having an air chamber, an air sub-tank chamber, a first passage communicating the air chamber of the variable air spring with the sub-tank chamber, and an opening/closing pulp that opens and closes the first passage; a second passage having an orifice and arranged in parallel with the first passage; and a one-way pulp that allows air to flow only from the sub-tank to the air chamber of the air spring; It is characterized by comprising a third passage arranged in parallel to the.

In the automobile suspension of the present invention having the above-described structure, for example, by closing the first passage when driving on a rough road, the air in the sub-tank chamber is pumped to the one-way pulp in the third passage due to frequent and large-amplitude movements of the vehicle body. Since the air is gradually supplied into the air chamber of the air spring through the air, the amount of air in the air chamber increases gradually, so there is no sudden change in vehicle height, and the above-mentioned danger is eliminated. In addition, the height of the vehicle increases as a result, which naturally increases the risk of interference with the road surface.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An automobile suspension according to a preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an automobile equipped with a suspension according to an embodiment of the present invention. In this embodiment, front wheel suspension 1. ] and the rear wheel suspension (suspension 2, 2
an accumulator or sub-tank IA for changing the spring constant for each of 2. A is provided, and these are controlled by a control switch 3.

Next, referring to FIG. 2, suspensions 1.1 and 2.
A specific example of 2 will be explained. Note that the suspension number 12'' is for the rear wheel.

As shown in FIG. 2, a suspension 5-2 whose upper end is fixed to a part 10 of the vehicle body via an elastic body 11 is connected to an upper case 13 forming an air chamber 12 and a lower end of this upper case. The outer cylinder 14 and the inner cylinder 1 are assembled so that the upper end can go in and out.
Lower case 16 consisting of 5 and upper and lower cases 13% 16
A connecting body 17 that airtightly connects the inside of the case 1 and the upper and lower cases 1.
3. The inner cylinder 15 of the lower case 16 coaxially penetrates the inside of the lower case 16.
A piston rod 18 that can freely slide up and down against the main pulp 1 that is rotatably attached to the lower end of the piston rod 18
9 and a tom pulp 20 fixed to the lower end of the inner cylinder 15, the oil chamber in the inner cylinder 15 is divided by the main pulp 19 into a chamber A above the main pulp 19 and a chamber B below the main pulp 19, Further, the redaper chamber C between the outer cylinder 14 and the inner cylinder 15 is communicated with the upper end of the A chamber at the upper end, and with the lower end of the B chamber at the lower end. Further, a control rod 21 passes vertically through the center of the piston rod 18, and the upper end 21a of the control rod 21 is engaged with a rotation key 22 rotated by an external force so as to be able to transmit rotational force.

A lower end portion 18 of the piston rod 18 is provided at the lower end portion of the control rod 21 so as to communicate the A chamber and the B chamber.
an orifice 21 that communicates with the communication hole 18b drilled in a.
b is provided, and by rotation of the control rod 21,
Communication between the oriice 21b and the communication hole 18b of the lower end portion 18a of the piston rod is turned on and off.

The lower end of the piston rod 18 including the lower end of the control rod 21 and the main pulp 19 are connected to the tom pulp 2.
Details of the structure of 0 are omitted.

What is the relative vertical movement of upper case J3 and lower case 16?

In addition to the air spring provided by the air chamber 12, the upper and lower cases 13
．． Upper and lower spring cases 13at 1 fixed to 16
It is elastically absorbed by the spring 30 held between the two parts 6a. Brackets 16b and 16c fixed to the outer surface of the lower case 16 are wheels that rotatably support wheels.
- This is for fixing the wheel support structure including the pulley, so that the wheel is held on the part 10 of the vehicle body so that it can move up and down. That is, the vehicle body is suspended by wheels and elastically supported so as to be movable up and down.

An opening 121 is provided in a part of the peripheral wall of this air chamber 12! One end of a pneumatic pipe 23 for communicating the accumulator 2A and the air chamber 12 is connected to this opening 12a. In the middle of this air piping 23, air chamber 1 is connected from the accumulator 2A via this air piping 23.
An air flow control mechanism 31 is provided for controlling the supply of air to the accumulator 2A and the discharge of air from the air chamber 12 to the accumulator 2A. Next, the configuration of the air circulation control mechanism 31 will be explained with reference to FIG.
and six passages 32, 33, 34. The first passage 32 is provided with an on-off valve 35 that is an electromagnetic valve that is operated by an actuator 35a that is a solenoid. The second passage 33 is provided with an orifice 36 that limits the flow rate of air flowing through this passage.

The third passage 34 is connected to the air chamber 1 from the accumulator 2A.
A one-way pulp 37 is provided that allows air to flow only to the air. Actuator 35a of the on-off valve 35
is connected to the power source S via the changeover switch 3.

Next, the operation of the suspension constructed as described above will be explained with reference to FIG. 3.

Under normal conditions, the above 1. 2nd and 3rd passage 3
2.33.34 Air is supplied to the accumulator 2A
and air chamber J2.

When the changeover switch 3 is turned on when the road becomes rough, the actuator 35a is excited, so the on-off valve 35 closes the first passage 32. When the car drives on a rough road in this state, the suspension repeatedly expands and contracts. During this suspension expansion, the air chamber 12 becomes negative pressure, so the air chamber 12 is connected to the second and third passages 3 from the accumulator 2A.
Air is supplied via 3.34. On the other hand, when the suspension contracts, the pressure in the air chamber 12 increases, so the air in the air chamber 12 is transferred to the accumulator 2.
However, since the one-way pulp 37 as described above is provided in the third passage 34, the air flows into the accumulator 2A through this third passage 34.
It cannot flow into the accumulator 2A only through the second passage 33. However, this second passage 33 is provided with an orifice 36.

Air flows into the accumulator 2A only gradually. As mentioned above, when driving on rough roads, vertical movements of the vehicle body with large amplitudes occur frequently, so the air chamber 12 is gradually filled with air.
The vehicle body is also gradually raised.

I lost my head. As described above, the rate and amount of air increase in the air chamber 12 are proportional to the magnitude and frequency of vertical movement of the vehicle body, so the vehicle height is naturally determined according to the road conditions. Furthermore, even if the switch 3 is erroneously operated while driving on a flat road, there is almost no vertical movement of the vehicle body, so sudden changes in vehicle height are unlikely to occur.

In the above embodiment, the on-off valve 35 is provided in the first passage 32 and the orifice 36 is provided in the second passage 33. However, as shown in FIG. By providing 1. The second passage can be omitted.

A double-acting solenoid pulp may be used as the on-off valve, or a manual valve may also be used.

Further, the switch 3 may be controlled manually or automatically.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an automobile equipped with a suspension according to an embodiment of the present invention. FIG. 2 is a sectional view showing an example of a spring means used in the suspension of the present invention. FIG. 3 is a system diagram of an embodiment of the suspension of the present invention. FIG. 4 is a diagram showing a modification of the main parts of the nine system diagram shown in FIG. 3. 1.2... Suspension, IA, 2A... Accumulator, 3... Changeover switch, 12... Air chamber. 32...first passage, 33...second passage, 34...
3rd passage, 35...on/off valve, 36...orifice%
37...One-way pulp. Patent applicant: Toyo Kogyo Co., Ltd.

Claims (1)

[Scope of Claims] An air spring provided with an air chamber, an air sub-tank chamber 1, a first passage communicating the air chamber of the air spring with the sub-tank chamber, and an opening/closing pulp that opens and closes the first passage. a second passage having an oriice and arranged in parallel with the first passage, and a one-way valve that allows only the flow of sudden air from the sub-tank to the air chamber of the air spring;
An automobile suspension comprising a sixth passage arranged in parallel with the first and second passages.