JPS59184007A - Car suspender - Google Patents

Abstract

PURPOSE:To make the damping force adjustable by providing an orifice for passing magnetic fluid and a magnetic plate valve at the piston section of a cylinder mechanism encapsulated with magnetic fluid and compressed gas thereby making the apparent specific gravity of magnetic fluid variable by means of an electromagnetic coil. CONSTITUTION:When pushing in a rod section 3, first plate valve 30 is pushed up to flow magnetic fluid 23 through an orifice 28 to the rod body 10 side. Consequently damping force is produced to push up a free piston 20 thus to compress gas 21 and to ballance them. When expanding the rod section 3, it will function reversely. If power is supplied to an electromagnetic coil 32 to produce magnetic field at this time, apparent specific gravity of magnetic fluid 23 passing through the orifice 28 is varied in accordance to the strength of magnetic force thus to vary the damping force. Consequently the damping force can be adjusted through variation of power supply or on-off of electromagnetic coil.

Description

[Detailed description of the invention] The present invention relates to a vehicle suspension system using magnetic fluid.

2. Description of the Related Art Suspension devices in which oil and compressed gas are sealed inside a cylinder mechanism, and a heavy body is elastically supported by the repulsive force of the compressed gas, are conventionally known. Furthermore, a structure in which an orifice is provided in a piston portion of a cylinder mechanism to create oil flow resistance and exert a damping force is also widely known.

However, in conventional suspension systems of this type, the damping force is determined primarily by the opening amount of the orifice, the viscous resistance of the oil, etc., so it is difficult to obtain the desired damping force depending on the road surface condition and other conditions. There are drawbacks. Therefore, there are some devices that make it possible to adjust the opening amount of the orifice from the outside to make the damping force variable, but in this case, the opening amount of the orifice must be mechanically adjusted by remote control from the outside. The problem was that it became very complicated.

The present invention has been made based on the above circumstances, and it is an object of the present invention to provide a heavy-duty suspension system that has a simple structure and can arbitrarily adjust the damping force.

That is, the present invention includes a cylinder mechanism provided between a heavy body and an axle-side member, in which a magnetic fluid and a compressed gas such as high-pressure nitrogen are sealed (and the magnetic fluid is circulated through a piston portion of the cylinder mechanism). A suspension device for a vehicle, characterized in that the piston portion is provided with an electromagnetic coil for providing a chamber for containing a magnetic fluid passing through the orifice. be.

The present invention having the above configuration changes the apparent specific gravity of the magnetic fluid flowing through the orifice by controlling the current flowing through the electromagnetic coil. The force applied to the grate valve by the coil can be controlled, and the reducing force can be effectively adjusted through the mutual effects of these forces.

A first embodiment of the present invention will be described below with reference to FIGS. 1 to 3. In FIG. 1, reference numeral 1 denotes a cylinder tRg provided between the vehicle body and the axle side member, and this cylinder mechanism 1 includes a cylinder body 2 and a cylinder body 2 that is movable in the axial direction with respect to the cylinder body 2. It is comprised of an inserted rod portion 3 and a force member 4 provided so as to surround the rod portion 3 and the outside of the cylinder body 2.

More specifically, a mounting portion 5 is provided at the bottom of the cylinder body 2 to be attached to an axle side member (not shown), and a seal 6 is provided at the top of the cylinder body 2 at a portion that makes sliding contact with the rod portion 3. A magnetic fluid storage chamber 7 is also provided in the cylinder body 2, and this chamber 7 is filled with magnetic fluid.

On the other hand, the rod portion 3 includes a rod portion main body 10 having a cylindrical shape,
A hollow core frame 1 coaxially inserted into the rod body 1O, and an end plate 12 fixed to the upper end of the core frame 11.
, and a piston portion 14 fixed by a lower end button nut I3 of the core frame 11. In addition, the upper end of the core frame 11 is attached to a member 16 on the vehicle body side using a nut 15.
It is now fixed to .

In addition, the inside of the rod body lO is a free piston 2.
The high pressure chamber 2 is divided into upper and lower parts by 0, and the high pressure chamber 2 formed on the upper side is filled with a compressed gas such as nitrogen gas, and the magnetic fluid chamber 2 is formed on the lower side of the free piston 2θ. The magnetic fluid 23 is accommodated in the chamber 22Kj.

The piston portion 14 is provided with an orifice through which the magnetic fluid flows. The above orifice is the second
As shown in detail in the figure and Fig. 3, a constant orifice 26... and an orifice 27 with a relatively large inner diameter...
・It consists of 28 rivers with different inner diameters.

And on the top side of one of the orifices 27...
A first plate valve 3θ made of a magnetic material such as iron-based gold is provided. Also, the other orifice 28
. . . Also on the lower surface side shown in the figure is a second
A plate valve 31 is provided. Further, the constant orifices 26 are always open.

Further, the piston portion 141 has the orifice 27
. . , 28 . . . are respectively surrounded by electromagnetic coils 32 . Each electromagnetic coil 32
Conductive wire 32a...1/'i for power supply, above-mentioned core frame i
It is led out to the outside through a hollow hole 11a formed in 1.

In the first embodiment configured as described above, for example, when the rod portion 3 moves in the direction of being pushed in, the first plate valve 3
0 is pushed up and the magnetic fluid in the cylinder body 2 flows into the rond part main body 1o side. Due to resistance, etc., a damping force is generated. The magnetic fluid flowing into the rod main body 1θ pushes up the frilled piston 2o and further compresses the compressed gas, so that the repulsive force increases, and the free piston 20 stops rising at a position where the pressure with the magnetic fluid is balanced.

On the other hand, when the tip 2 part 3 expands, the magnetic fluid flows in the opposite direction to the above, the second plate valve 31 is pushed open, the magnetic fluid flows into the cylinder body 2 side, and the orifice 28...
Damping force can be obtained by passing through the constant orifice 26. Note that since there is a difference in inner diameter between the two orifices 27° and 28, the rod portion 3
Different damping forces can be exerted depending on the direction of movement.

Then, when the electromagnetic coils 32... are energized and excited, the specific gravity of the magnetic fluid flowing through the orifices 27..., 28... changes, and each plate valve 30, 31 changes depending on the strength of the magnetic field. It is attracted to the electromagnetic coil 32 side.

Therefore, if you want to adjust the damping force, the electromagnetic coil 32
If you control the magnetic field by changing the value of the current flowing through it, or by turning the current on and off, you can change the strength of the magnetic field [
The damping force can be arbitrarily changed accordingly.

Note that FIGS. 4 and 5 show a second embodiment of the present invention, and since the basic structure is the same as that of the first embodiment, common parts are given the same reference numerals and explanations will be omitted, and different parts will be omitted. The parts will be explained below. That is, the piston portion 14 of this second embodiment is constructed as shown in FIG. The magnetic coil 32 is formed in a ring shape around the piston portion 14, and has an orifice 27 inside thereof.
.

28... are formed. One orifice 22.
... passes through the piston portion 14 in an oblique direction, and a first plate valve 30 made of a magnetic material is provided at the upper end opening of the piston portion 14 so as to be movable toward and away from the piston portion. And this first plate valve 30
It is biased in the direction of closing the orifice 27 by a compression coil spring 4 provided between the spring seat 40 and the spring seat 40. The orifices 27 communicate with the magnetic fluid storage chamber 2 on the cylinder body side through a communication hole 42 formed in the core ring 11.

Further, the other orifice 28... is the piston portion 14
A second plate valve 31 made of a magnetic material is provided at the lower end opening of the second plate valve 31 so as to be movable toward and away from the second plate valve 31 . This second plate valve 31 is connected to the core ring 1 by a nut 13.
It is fixed at no.

Therefore, when the piston portion 14 descends, the magnetic fluid energizes the communication hole 42 and the orifice 27, pushes up the first plate valve 30, and flows. On the other hand, when the piston portion 14 rises, the magnetic fluid K flows through the other orifice 28 and forces the second plate valve 31 open.

Also in the second embodiment configured in this way, by controlling the magnetic field by the electromagnetic coil 32, the attraction force of each valve 30, 31 can be changed, and the orifice 27 ..., 28
The apparent specific gravity of the magnetic fluid passing through can be changed, and the magnitude of the damping force can be adjusted arbitrarily.

In the above embodiment, a pair of upper and lower plate valves are provided, but the intended purpose of the present invention can be achieved even with only one plate valve.

In addition, embodiment 1 of the present invention (in a simple manner that does not go against the gist of the present invention, the specific aspects such as the shape and structure of the piston part, orifice, plate valve, electromagnetic coil, etc. can be modified in various ways) Of course.

As described above, according to the present invention, by controlling the magnetic field applied to the magnetic fluid and controlling the attraction force to the plate valve, the damping force can be effectively changed, and excellent damping performance can be achieved. We can provide Motsuwata @ suspension system. In addition, since the damping force is changed automatically by the electromagnetic coil, the structure is simple and the operation reliability is high, which has great effects.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention.
2 is a sectional view of the piston portion, FIG. 3 is a bottom view of the piston portion, FIG. 4 is a longitudinal sectional view showing the second embodiment of the present invention, and FIG. 5 is a longitudinal sectional view of the suspension device. It is a sectional view of the piston part in the same example. 1... Cylinder mechanism, 7... Magnetic fluid storage chamber, 14
...Piston part, 21...High pressure chamber, 22...
・Magnetic fluid storage chamber, 23...Magnetic fluid, 26.27° 28...Oliice, 30.31...Grate valve,
32... Electromagnetic coil.

Claims (1)

[Claims] A plate made of a magnetic material and an orifice that seals magnetic fluid and compressed gas inside a cylinder mechanism provided between the heavy body and the east shaft side member, and that circulates the magnetic fluid to the piston portion of the cylinder mechanism. 1. A heavy-duty suspension device, characterized in that a valve is provided, and an electromagnetic coil is further provided in the piston portion.