JPS5816403Y2 - vehicle suspension system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a suspension system for a vehicle that is equipped with a vehicle height adjustment device and that controls a suspension unit when the vehicle turns.

More specifically, each suspension unit of the left and right wheels is equipped with a common vehicle height adjustment device, and each port of the oil passage of each unit is controlled by centrifugal force at the three-way connection between each unit and the hydraulic power source. A sphere is installed that selectively closes the oil passage port of the suspension unit on the low-load side during turning, and the oil passage port of the suspension unit on the low-load side is closed by centrifugal force and the hydraulic pressure of the suspension unit on the high-load side. The present invention relates to a vehicle suspension system that prevents flow to the low load side, prevents excessive tilting of the vehicle when turning, and is also preferable as a countermeasure against damage to left and right suspension units and oil passages.

In a vehicle suspension system, the vehicle height can be adjusted for each set of front and rear suspension units on the left and right sides by using the displacement between the vehicle body and the suspension system, without having to install a vehicle height adjustment device on each suspension unit. Suspension systems are already known which each have a vehicle height adjustment device for this purpose.

In such a suspension system, the oil passages to the left and right suspension units are generally connected by a single system of oil passages after the adjustment device, and each suspension unit is substantially connected to the other suspension units.

Therefore, when the vehicle turns, the load on the suspension unit on the outside of the turn becomes higher than the suspension unit on the inside due to the action of centrifugal force, which is compressed and the internal oil pressure increases.

If the left and right suspension units were connected by a single oil line as described above, during this turn, the hydraulic pressure would flow from the suspension unit on the high load side to the suspension unit on the low load side, which would cause the suspension unit on the low load side to flow. The stroke increases and the difference in stroke between the left and right suspension units increases, which increases the height difference between the left and right suspension units, resulting in an excessively inclined posture, which is not desirable.

To prevent the excessive tilting posture during turning as described above, various control devices have been proposed in the past, but all of them have complicated structures and are expensive.

There are problems with reliability and other issues.

The present inventor devised the present invention in order to reliably control the excessively inclined posture of the suspension system during turning with a simple structure.

The purpose of the present invention is to provide a sphere that selectively closes each port of the oil passage of each unit at the three-way connection between the left and right suspensions and the hydraulic power source, thereby eliminating centrifugal force. In cooperation with the hydraulic pressure of the suspension unit on the high load side, the port of the suspension unit on the low load side is blocked, preventing the flow of hydraulic pressure from the high load side to the low load side, and preventing the flow of hydraulic pressure from the low load side due to hydraulic flow. Prevents excessive stroke extension,
To provide a suspension system for a vehicle which is capable of controlling an excessively tilted posture during turning and is capable of achieving the above with a simple configuration as described above.

In addition, the purpose of the present invention is to control the excessive inclination and, if damage occurs to the suspension or its oil passage, the oil pressure in the oil passage decreases, or the port of the sphere opens, causing the left and right to move. To provide a suspension system for a vehicle capable of achieving the above-mentioned purpose while maintaining balance in a suspension and having the advantage of a single system of oil passages.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

This will clarify further objectives and advantages of the present invention.

1 and 2 are suspension units for one of the front and rear wheels,
Suspension units 1 and 2 dominate the left and right groups.

Cylinder 1a, 2 of suspension unit 1, 2
The rod a is connected at its lower end to left and right wheels (not shown), and each rod Ib and 2b is connected and supported on the body 9 side.

The suspension unit 1.2 joins together via oil passages 3 and 4, and is connected to the vehicle height adjustment device 5 through a single oil passage 6, and the vehicle height adjustment device 5 is connected via oil passages 7 and 8. One end 7 is connected to the pump, and the other end 8 is connected to the reserve tank.

The above oil passages 3, 4 and oil passage 6 are connected to the control device 1 described below.
0 is interposed at the confluence.

The main body 11 of the control device 10 has a cylindrical shape, and is disposed so that its axis matches the axial direction (left and right direction) of a wheel (not shown), and the front and rear in the axial direction, that is, the left and right ends are connected to the wall 1.
1a and 11b, and a cylindrical chamber 12 is provided between the walls 11a and 11b.

Both axial ends within the chamber 12, that is, the walls 11a. Protrusions 11c and 11d are provided at each opposing inner end of 11b, and these protrusions 11
Ports N3.14 are opened in the center of c and 11d, and ports 13 and 14 are connected to passages 13a provided in walls 11a and I ib.
, 14a to the outside of the main body 11.

The ports 13, 14 are located 180° apart, and the openings of the passages 13a, 14a are located above and below the body 11.

A sphere 15 is installed inside the father's room 12 so that it can be moved freely, and the diameter of the sphere 15 is set so as to fit closely with the inner diameter of the chamber 12. , 11d, there is a balance spring 16.
16 is compressed and the sphere 15 is held at the center in the axial direction.

A through hole 17 is provided in the center of the father housing chamber 12, and the inside of the chamber 12 and the oil passage 6 of the vehicle height adjusting device 5 are connected through the through hole 17.

A groove 18 is provided in the axial direction on the peripheral wall of the portion of the chamber 12 having the through hole 17, and the left and right portions 12a within the chamber 12 are partitioned by the sphere 15 by the groove 18.

12b are communicated with each other.

The ports 13 and 14 of the main body 11 of the above control device 10
The passages 13a and 14a connected to the suspension units N and 2 are connected to the suspension units N and 2 described above as follows.

That is, the oil passage 3 of one suspension unit 1 is communicated with the passage 14a of the main body 11 on the opposite side of the unit 1, and the oil passage 4 of the other suspension unit 2
communicates with the passage 13a on the opposite side of the unit 2.

As a result, the port N3.14 detours 1800 degrees and opens into the chamber 12 on the opposite side from the corresponding suspension units 1 and 2, and the relationship between the unit and the port is reversed from left to right.

Next, to explain its operation, FIG. 1 shows a running state in a normal posture, in which the left and right suspension units are at the same height and the control device 10 attached to the vehicle body is also in a horizontal state.

Therefore, the sphere 15 is located in the center of the chamber 12 of the main body 11 and is held at this position by the balance spring 16.
Since it communicates with the oil passage 6 through the through hole 17, the hydraulic pressure of the vehicle height adjustment device 5 is transmitted to the left and right suspension units 1.
2, the vehicle height can be adjusted.

By the way, when a vehicle turns, compressive force is applied to the suspension unit on the outside of the turn due to the action of centrifugal force, and the stroke of this unit is reduced.

For example, in Figure 1, let's say that the left side is the outside of the turn, and the right side is the inside of the turn.

Suspension unit 1 on the outside of the rotation becomes the high load side,
The suspension unit 2 on the inner side of the turn becomes the low load type side.

The oil passages 3 and 4 of each unit 1 and 2 are connected to the ports 13 and 14 mentioned above.
Since the two units communicate with each other through chamber 12, the hydraulic pressure of the high-load side unit 1 flows into the low-load side unit 2, and as a result, the hydraulic pressure of the low-load side unit 2 increases, and its stroke lengthens. .

Therefore, the height difference between it and the other unit 1 becomes a dog,
The tilted posture during turning becomes excessive.

During the above turning, centrifugal force also acts on the sphere 15 in the control device 10, and the sphere 15 rolls to the left in the figure against the spring 16 due to the centrifugal force, closing the port 13 facing it.

As a result, the port 131/'i is cut off from the inside of the chamber 12, the oil passage 4 of the suspension unit 2 on the low load side connected to this port 13 and the passage 13a is cut off, and the communication between the left and right suspension units 1 and 2 is cut off. It will be blocked here.

Therefore, the hydraulic pressure of the high-load side suspension unit 1 only acts to suppress the sphere 15 to the left in the figure, that is, to bias the port 13 in the direction of closing it, and only to the oil passage 6 of the vehicle height adjustment device 5, thereby reducing the It does not act on the load side suspension unit 2.

In this way, the excessive tilting posture of the vehicle when turning is controlled by the movement of the sphere 15 due to the centrifugal force and the cooperative action of the hydraulic pressure from the suspension unit on the high load side, as well as the circulation of oil between the left and right suspension units. Become.

When turning in the opposite direction, contrary to the above, the suspension unit 2 on the right becomes the high load side, and the sphere 15 rolls to the right in the figure due to centrifugal force, closing the port 14.

The yarn path of the left suspension unit 1 on the low load side is blocked, and the excessively inclined posture is controlled.

Therefore, when turning either to the left or right, the oil passage to the low load side is blocked, and the circulation between the left and right suspension units 1 and 2 is se'ed, and the damping during turning depends on the spring action of each suspension unit. It will be released.

In the above, the equation of action that causes the above operation on the ports 13 and 14 of the sphere 15 is shown as follows, where the centrifugal force of the sphere 15 is F, the port area of the ports 13 and 14 is A, and the set load of the balance spring 16 is f. , left and right suspension units 1 and 2 during turning
If the pressures of are Pa and Pb, and considering the case of Pa)Pb, if the operation is performed normally, F+PaA > f0PbA, and the sphere 15 will block either of the points 13.14.

When the pressure on the high load side disappears, F<f+PaA, and the ports 13 and 14 are no longer blocked by the sphere 15.

This relationship can be maintained even if the even/odd pb is small by making the port area A appropriately large.

When the vehicle starts, travels straight, or makes a slight turn, F(f), and the sphere 15 is pressed into the hole only when F>f.

and by the above F=f The relationship is appropriately determined within the range of minute turning.

In this way, the excessively inclined posture can be controlled by appropriately taking into account the centrifugal force, the opening area of the port, and the set load of the balance spring.

If the above-mentioned device is damaged and the suspension unit or either the right or left oil passages 3 and 4 are damaged and oil leaks, the vehicle body may tilt, which may impede driving.

Let us assume that oil leakage occurs due to damage in a certain pipeline between the suspension units 1 and 2 and the Ea oil passage 3.4.

If the above occurs while traveling straight, the sphere 15 is at the center position on the left and right sides as shown in the figure, and the left and right suspension units 1 and 2 and this thread path are in communication, so oil leaks evenly, and the oil leaks out at the same time on the left and right sides. This lowers the vehicle height and prevents the vehicle body from tilting, ensuring normal driving.

Next, during turning, if the sphere 15 presses against either port 13 or 14 and blocks it, or if there is oil leakage from the suspension system on the low load side, As the oil leaks, the side with the larger stroke becomes smaller, and the vehicle body attempts to return from the tilted state to the horizontal state, ensuring normal and safe driving.

Furthermore, if the suspension system on the high load side leaks, the pressure on the high load side will decrease, so even if the sphere 15 is crimped to the port on the low load side by centrifugal force, the pressure on the high load side will decrease, In other words, the decrease in the pressure on the back of the sphere and the pressure on the low load side overcome the centrifugal force, and the complete crimped blockage by the sphere is released.The oil in the suspension system on the low load side leaks from the suspension system on the high load side, and at the same time both left and right Since the vehicle height of the vehicle is lowered, it is safe without causing an excessive tilting phenomenon.

As is clear from the above, according to the present invention, a sphere that selectively closes each port of the oil passage of each unit by the action of centrifugal force is provided at the three-way connection part with the left and right suspension unit hydraulic power sources. In cooperation with the hydraulic pressure of the high-load suspension system, the port of the suspension system on the low-load side is closed and the flow of hydraulic pressure from the high-load side to the low-load side is controlled, so that the hydraulic pressure from one side to the other during turning is reduced. It is possible to prevent excessive stroke extension on the low load side due to flow, and to control excessive tilting posture during turning, which is advantageous in terms of improving vehicle safety.

In addition, the present invention accomplishes the above by using spheres, springs, cylinders, 1800 detours of piping, etc., and the structure is simple and can be obtained at low cost.Moreover, the simple structure ensures reliability of operation, and the operation of this device is also simple. By using the spherical balance spring, centrifugal force, port opening area, etc., it can be set arbitrarily even during minute turns, and reliable operation can be expected.

Furthermore, while considering the above, the present invention is capable of balancing the tilting position as described above even if the left and right suspension systems are damaged, and can ensure normal operation even if the above accident occurs during a successful turn. It exhibits various advantages such as being able to carry out tasks, is safe, and is highly practical.

[Brief explanation of drawings]

The drawings are systematic explanatory diagrams showing one embodiment of the present invention. In the drawing, 1 and 2 are the suspension unit, 3°4 is its oil passage, 5 is the vehicle height adjustment device, 6 is this oil passage, 11 is the main body, 12 is the chamber, 13 and 14 are the ports, and 15 is the oil passage. sphere, 1
6 is a spring.

Claims (1)

[Scope of utility model registration request] In a suspension system for a vehicle, which is provided at the front and rear of the vehicle, and in which the left and right wheels are combined as a set, and the suspension units for the left and right wheels are provided with a common vehicle height adjustment device, A cylindrical body facing in the axial direction of the wheel is provided at the three-way connection that connects the oil passages of the left and right suspension units and the oil passages of the oil passages and the oil passage of the hydraulic power source. It communicates with the oil passage and the oil passage of the suspension unit, and this communication chamber contains a sphere that rolls in the axial direction due to centrifugal force, and each port opens into the communication chamber of each oil passage of the left and right suspension units. A suspension system for a vehicle, which is arranged to face the spherical body, and each port is arranged so as to be different from the corresponding suspension unit by 180 degrees.