Bayer Aktiengesellschaft

Metzeler Kautschuk Gmbh

Gunter Oppermann

Robert Horst Bloodworth

Wolfgang Podszun

Volker Hartel

John W Goossens

Wolfgang Grape

Uwe Claussen

Gunther Penners

Fritz Feld

Dieter Theisen

Roland Flindt

Electroviscous liquid

Electroviscous fluid based on polyether acrylates as disperse phase

The present invention relates to electroviscous liquids consisting essentially of

Electroviscous liquids based on polymer dispersions with an

A system-integrated motion sensor is provided for monitoring and adjusting EVF system. The motion sensor is based on the concept that, with the aid of electrodes (4,5) that are already present and which are used for the viscosity control of the EVF in a hydraulic system, an electric current signal is simultaneously produced which is directly related to the rate of flow of the EVF between the electrodes. The electrodes are either stationary or can be displaced with respect to each other. Thus the motion sensor consists of the electrodes with the intermediate EVF layer and a circuit connected to the electrodes for measuring the electric signal produced by the motion. The measured signal thus obtained can advantageously be used for adjusting or controlling the viscosity of the EVF layer. For this purpose the measured signal is compared with a preadjusted value and the difference is used for controlling a high-voltage device which provides an output voltage dependent on the control voltage. This output voltage is fed back to the electrodes of the EVF layer and in turn influences the viscosity. Thus the measuring sensor for the motion, that is the EVF layer together with the associated electrodes, simultaneously forms the regulating unit for controlling the motion.

Sensor-controlled hydraulic system with electroviscous fluids

The invention relates to a two-chamber bearing, in particular for motor vehicles, which has hydraulic damping, the liquid-filled chambers of which have rubber elastic peripheral walls and are connected to each other by a line which is provided in a rigid intermediate plate. According to the present invention, a so-called active bearing is provided which can be rapidly adapted to the operational conditions in each case by filling the chambers with an electroviscous liquid, the viscosity of which may be controlled by applying an electrical field in the area of the line which passes through the intermediate plate.

Two-chamber engine bearing which has hydraulic damping

Electroviscous fluids are disclosed which are composed of aluminum silicates particles in an electrically non-conductive liquid and a suitable dispersing agent. The atomic ratio of Al/Si on the surface of the aluminum silicate lies within the range of 0.15 to 0.80.

Electroviscous fluids

The electroviscous suspension is based on a mixture of aqueous silica gel with silicone oil as the liquid phase to which a dispersant is added. The dispersant consists of amino functional or silicon-functional polysiloxanes having a molecular weight above 800. The concentration of the dispersant is from 1 to 30% by weight and preferably from 5 to 20% by weight, based on the silica gel particles. Electroviscous suspensions such as these are distinguished by the fact that they are highly compatible with elastomeric materials, non-sedimenting, non-inflammable and physiologically acceptable. In addition, they are heat- and freeze-resistant over a wide temperature range and are largely unaffected by temperature and pressure in their viscosity.

Electroviscous liquids

Laser light of different wavelength can be produced by exciting sparingly water soluble fluorescent compounds of which the .alpha..alpha. m value is less than 0,300 and of which the molecular symmetry is either of symmetry group C.sub.s or of a higher symmetry group than this, the fluorophor having to form a rigid system if the compound belongs to symmetry group C.sub.s, the compounds being present in concentrations of between 10.sup..sup.-1 and 10.sup..sup.-5 mol/l in organic solvents.

Growing community of inventors

Leverkusen, Germany

Gunter Oppermann