DE3330205C2 - Self-regulating shock absorbers, in particular for motor vehicles - Google Patents

Abstract

The invention relates to a self-regulating shock absorber, in particular for motor vehicles, consisting of a cylinder which is closed at both ends and which is filled with a damping medium and has a piston rod with a piston that carries high and low pressure valves. An electronic control circuit is arranged within the cylinder. At least two electrically conductive, electrically separated strips or shells are arranged along the cylinder wall and are in direct contact with the liquid damping medium, which is an electrical insulator and has a viscosity that changes in the dielectric depending on the electrical field strength . An electric field is applied to the two strips or shells via electrodes, the voltage of which is regulated by the control circuit according to the calculated instantaneous data of the shock absorber to change the viscosity of the damping medium.

Description

3 4

Voltage of the shock absorber like a normal shock- see voltage applied wildly To this end, the cylinder has

damper reacts. the cover two insulating bushings 22, 23, preferably

The shock absorber according to the invention can thus have glass bushings in which the electrical

the regulation of the viscosity is practically without time supply lines for each half cylinder 7,8 a

adapt the delay to any given road situation. In 5 are bedded. There are now-

Advantageously, all the units within are more the electrodes connected to the lines

of the shock absorber integrated Furthermore allows 20.21 arranged

the shock absorber according to the invention that now each- The two half cylinders 7, 8 are at their upper

the shock absorber is regulated by itself and closed by means of an insulating cover 12 at the end, the

each shock absorber completely covers the front edges of the half-cylinders 7, 8 independently of the other 10,

current road conditions automatically adjusts so that the half cylinders 7, 8 compared to the cylinder

In addition, this shock absorber has practically cover 2 are electrically isolated.

no inertia because the viscosity changes. The piston 13 is constructed like an ordinary one

of the liquid damping medium when changing the pistons known shock absorbers, but the peripheral

electrical voltage or the electrical field on the outside wall of the piston opposite the half-cylinder

can relieve instantly and within the damping fluid 7, 8 electrically isolated for this purpose

takes place uniformly So that the shock absorber reacts, for example, the piston 13 from a suitable

the control signals of the control non-conductive and resistant plastic act practically without inertia

circuit. stand. Or just the peripheral mantle surface of the

An example of the invention is shown in the drawing. 20 Piston 13 has an electrically insulating protective position and then described. It shows layer on so as to establish an electrical connection between

F i g. 1 to exclude a cross-section through an entire joint - the two half-cylinders 7, 8,

Damper to represent the cylinder, the piston rod. Otherwise, the piston has 13 in a known manner

ge with piston, the metal half cylinder as field two valves 16,17, which are used as high and low pressure

plates and the control circuit and 25 Ie can be performed. These valves 16, 17 are

F i g. 2 shows a cross section through FIG. 1 along the covered by means of spring assemblies 14, 15 The entire

Section line AA with the omission of the piston rod. The arrangement of the spring assembly-piston-spring assembly is on

and the piston. the lower, tapered end of the piston rod is attached

The embodiment shown by way of example in the figures and held by means of a screwed-on nut 31 of the shock absorber according to the invention consists of a 30 The upper part of the piston rod 3 has a polish outer cylinder 1, which is usually a metallization 26, inside which an electronic control and is shear cylinder and which is arranged at its lower end a control circuit 24 Furthermore are inner brackets 5 for fastening, for example, on the wheel half of the cylinder, an acceleration and given The upper end of this cylinder case has displacement transducers 25 which receive their signals 1 is closed by means of a cylinder cover 2, 35 plus the acceleration and the path to the control in the center has a bore through which the cylinder and control circuit 24 is transmitted. Further through which a piston rod 3 protrudes. The upper, outer, piston rod or cylinder has a (not re end of the piston rod 3 has a holder 4 for the drawn) direction indicator, which the current Attachment, for example, to the body in one direction of the piston rod opposite the cylinder Vehicle, the lower, submerged end of the piston 40 discriminates and also a corresponding bar carries a piston 13th output signal to the regulating and control circuit 24

Inside the outer cylinder 1 is another tet. Furthermore, via an external supply line 28 Cylinder 6 is arranged, which is attached to the cylinder wall for further data that is useful for regulating, such as the Gedes Cylinder 1 fits snugly. This cylinder 6 is the speed of the vehicle or the speed of the mouse electrical insulating material and can therefore be fed to the regulating and control circuit 22 as a 45 gate Insulating cylinders are designated. This Isolierzylin- are. Via the external connection 29, the elekder For example, the dispatchers can also use an electrically electronic regulating and control circuit 24 Coating, such as paint application or coating, supply voltage supplied.

exist as long as this has a sufficient electrical dielectric strength of the two chambers formed by the piston 13 owns. The insulating cylinder 6 50 halves 18, 19 are coated with a liquid damping medium while up to below the cylinder cover 2, as filled by 27. This damping medium now has the F i g. 1 can be seen property that its viscosity in the electrical

Within this insulating cylinder 6 or within the field, depending on the electrical field strength, changes These are isolation from the outer cylinder 1 This means that such a liquid in the event of changes two electrically conductive half cylinders 7,8 arranged 55 the electric field strength its flow properties, which are preferably made of metal. All th changes and thus once more viscous or easy-flowing front edges these half cylinders 7, 8 are at a distance Bender will. Correspondingly, the relationship between one another changes arranged, wherein in this clearance resistance of the liquid as it passes through Men along the longitudinal axis of the shock absorber strips 9, the valves when the piston moves relative to -10 are arranged from insulating material. Inside the 60 above the cylinder.

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7, 8 such an insulating strip 11 is arranged. Electrodes 20, 21 applied an electrical voltage, so

So that these two half-cylinders 7, 8 two will be between the two half-cylinders 7, 8, which are called

opposing, electrically isolated field plates act, an electric field built up in Field plates to build up an electric field in which the damping medium acts as a dielectric

inside the shock absorber. For this purpose, each half cylinder 27 is located.

7, 8 via a supply line with an electrode 20, 21 which is the voltage applied to the half-cylinders 7, 8

connected to which, as shown in FIG. 2 is shown, an electrical, preferably a high voltage, in order to achieve a sufficient

1 sheet of drawings

55

60

65

5

de change in viscosity of the damping fluid 27 to achieve. Calculated based on the data entered

now the regulation and control circuit 24 the opti-)

male setting of the shock absorber and gives a corresponding signal to the external output 30. Die- 5 ι This signal is used to control the

Voltage at the electrodes 20,21, which in turn Tr.

corresponding to the viscosity of the damping fluid | ί

27 is changed due to the changing field strength between the half cylinders 7,8.

The electric field generated is preferably a constant field, the voltage applied to the half cylinders 7, 8 preferably a direct voltage. The damping fluid 27 used has high electrical Insulating properties to keep dielectric losses low.

The necessary DC voltage is generated via an external, not shown, control or controllable DC voltage generator. This generator only needs a comparatively minor one To have performance, since only small electrical displacement currents are necessary to change the viscosity and consequently the dielectric losses are low.

25th

List of reference symbols

1 outer cylinder

2 cylinder covers

3 piston rod 4.5 brackets

6 insulating cylinders

7.8 metal half cylinders

9,10,11 insulating strips

12 insulating covers

13 pistons

14.15 spring packages

16.17 valves

18 upper half of the chamber

19 lower chamber half 20, 21 electrodes

22,23 insulating bushings

24 Regulation or control circuit

25 acceleration and displacement sensors

26 Bore inside the piston rod

27 Damping fluid inside the chambers

28 external input line for speed or RPM

29 Power supply

30 external control output line

31 mother.

Claims (1)

1 2 The piston has a flat, electrically conductive electrode on its peripheral jacket wall opposite the cylinder patent claims: wall, which the inner 1. Self-regulating shock absorber, in particular for the wall of the cylinder insulated from one side Motor vehicles, consisting of a lead to this electrode at both ends, is insulated by the KoI-closed Cylinder, which is led to the outside with a liquid damping rod via this supply line Fungsmedium is filled, which is an electrical insulation and at the same time to the cylinder wall can a is lator and has a viscosity that can be applied in the voltage, so that in the gap between Electricity depends on the electric field strength of the cylinder wall and the electrode on the piston changes and with a piston rod that seals io ben an electric field is created by changing the tet is immersed in the cylinder and the voltage applied to your cylinder can now be the electrical the side end a field against the cylinder wall within the damping fluid that seals the seal Piston with a direction-dependent stand between the electrode on the piston and the and low pressure valves which fills the cylinder-cylinder wall can be changed, thereby increasing The space is divided into two halves and the viscosity of the damping fluid changes within it Cylinder an electronic regulation or control of the viscosity of the damping fluid can circuit and possibly acceleration, the cylinder also have a bypass, with inner-directional and displacement transducer for the acceleration, half of the bypass two mutually isolated, electronics Direction of movement and the path of the cylinder freshly conductive surfaces facing each other the piston are arranged, with 20 being arranged. The one surface can be integral with the the damping medium connected to a changeable electric cylinder and metallic, with the Gesches The field for changing the viscosity is placed, the opposite electrode within the bypass is isodas thereby characterized in that it is lated inside and an outwardly insulated current supply The cylinder (1) has a minimum guide along the cylinder wall at least two electrically conductive, mutually electrically 25 This known device has the disadvantage that trically separated shells (7, 8) are arranged, which either the changing electric field does not penetrate the damping fluid directly connected to the damping medium (27) or these are manure and to which the electric field with penetration is not uniform, which is why a time-variable voltage is applied, with the delayed and uneven change of the viscosiles being arranged in an insulating cylinder (6), which resulted in the damping fluid is
in turn in a metal outer cylinder (1) 768 is electrically insulated from the shells and is electrically insulated from the shells. 2. Self-regulating shock absorber according to claim 1, halving a longitudinal bore and above the piston characterized in that the shells are spaced apart by at least two ra spacings which penetrate the longitudinal bore opposing half-cylinders (7,8) are. diae breakthroughs, which are made by an electrically 3. Self-regulating shock absorbers can be closed according to the claims Chen 1 or 2, characterized in that the 40 piston rod arranged electrical coil moving shells Hch is arranged along the cylinder wall Stripes are. The invention has for its object to be a 4. Self-regulating shock absorber according to claim 1 self-regulating shock absorber of the aforementioned or 3, characterized in that the piston (13) to create the type, simplifying its made of electrically non-conductive insulating material results in an even and immediate change in the structure stands. Viscosity of the damping medium with changing Ensures field strength. This object is achieved according to the invention in the features of claim 1. An excerpt 50 design of the invention is defined in the subclaims The invention relates to a self-regulating shock. damper, especially for motor vehicles, according to the shock absorber according to the invention has the her-generic term of claim 1. protruding advantage that its pistons and pistons through GB-PS 12 82 568 a shock absorber rod in a known manner can be easily constructed, use a damping fluid. By regulating the applied voltage to det, which is an electrical insulator and which is the one generating an electrical field momentarily in the dielectric depending on the prevailing electrical the viscosity of the liquid changed uniformly, wotrischen Has field strength changing viscosity. The shock absorber produced with this change with practically no time delay consists of an electrically conductive follows. Furthermore, the electric field penetrates the The cylinder, which is closed with end plates, is completely uniform without any disturbance due to the damping fluid Cine! CclOSnStTl ^ S "SfÜhrt i ^e t ^rt " f Aa »· Ain VsxIUam Fa * + Aa * · αΙαΙ ^ + ^ Ϊρ / ^ Καμ CaUliniAn tuacKnlk slnsJiir-sil ·» αϊηα is arranged. The piston has an uneven change in the viscosity of the damping amounts that connect the two chambers with one another through-bore. fluid is guaranteed. According to the under-Des Furthermore, the diameter of the piston is smaller different viscosity of the damping fluid pasals the inside diameter of the cylinder, so that it intervenes more or less easily when the see the peripheral jacket wall of the piston and the piston the valve passages. the inner wall of the cylinder has an annular gap. which is filled with the damping fluid. damper has the advantage that in the event of failure of the applied