Robert Boschgmbh

Hanniel Schmidt

Herbert Vollert

Dietmar Baumann

Frieder Keller

Dirk Hofmann

Helmut Wiss

Andreas Henke

Helmut Pueschel

Juergen Hilzinger

The invention relates to an electromechanical, self-boosting friction brake, in particular a disk brake. The friction brake is embodied with a wedge element for exerting contact pressure on a friction brake lining; a wedge angle (&#x3b1;) is selected such that a brake parameter C* is located at or near a pole point. As a result, a high self-boosting that tends toward infinity and consequently a low actuating force are attained. To avoid blocking of the friction brake, an actuating device is embodied to block an independent motion of the wedge element, or has a regulating device for regulating a contact pressure of the friction brake lining against a brake body (brake disk).

Self-boosting friction brake, device for measuring the coefficient of friction, and method for regulating a braking force

An electromechanically actuatable self-boosting disk brake in which a friction brake lining is guided displaceably with a guide whose angle to the brake disk is adjustable via an electric motor to attain brake reinforcement. The angle of the guide is adjusted independently of an actuating device with which the friction brake lining is pressed against the brake disk.

Disk brake

The invention relates to a friction brake () for a motor vehicle. The friction brake () for instance has a disk brake (), which is actuatable by means of an actuating device, for instance in the form of a ball thread drive (). The invention proposes embodying the friction brake () with a band brake (), whose band () is mounted on the circumference of a nut () of the ball thread drive (). If the brake band () is put under tensile stress in order to actuate the band brake (), then the brake band () rotates the nut () of the ball thread drive () in a tensing direction and in this way actuates the disk brake (). The invention has the advantage that the friction brake () has high brake boosting and therefore requires only little actuating energy. It is accordingly suitable for embodiment as an electromechanical friction brake () with an electric motor () for its actuation.

Disc brake that is actuated by means of a band brake device

The invention relates to an electromechanical disk brake (). To attain brake boosting, the invention proposes embodying the disk brake () with a multiple brake cylinder (), which is displaceable in a secant direction of a brake disk (), and which has both a friction brake lining piston (), which is displaceable transversely to the brake disk (), and two brake booster pistons (), disposed facing one another, which are displaceable parallel to the brake disk (), and which are braced on fixed abutments (), for instance on an inside of a brake caliper () of the disk brake (). For actuation of the disk brake (), the multiple brake cylinder () is displaced in the direction of rotation () of the brake disk (), and as a result, the brake booster piston () that is at the front in the displacement direction moves into the brake cylinder () and, via the friction brake lining piston (), presses the friction brake lining () against the brake disk (). A force of friction exerted on the friction brake lining () by the rotating brake disk () presses the multiple brake cylinder () in its displacement direction as well and as a result boosts a pressure exerted on the friction brake lining piston () by the brake booster piston (), thus in turn increasing the braking force.

Disc brake

A wheel brake device, which in particular is actuatable electromechanically, for a motor vehicle, includes a pivotable lever, one end of which is engaged by an energy-storing spring element and which with its other end presses against a wheel brake lining. The lever is pivotably supported by a support means that is displaceable in the longitudinal direction of the lever. By displacement of the support means in the longitudinal direction of the lever, a lever arm with which the energy-storing spring element engages the lever lengthens, and a lever arm with which the lever presses against the wheel brake lining shortens. A pressure force with which the energy-storing spring element, via the lever, presses the wheel brake lining against a brake disk can be adjusted by displacement of the support means.

Wheel brake device

A method and a device for determining at least one basic value of at least one measured quantity of a brake system. At the start of the system, the measured quantity prevailing at that time is then assumed as the basic value.

Method and device for determining a basic value of at least one measured quantity of a brake system

The invention relates to a drum brake device ( ), which is provided as a wheel brake for a motor vehicle. The invention proposes embodying the drum brake device ( ) with a brake belt ( ), which is disposed inside a brake drum ( ) and can flex in the radial direction of the brake drum ( ). Thrust exerted on one end ( ) of the brake belt ( ) with a simultaneous bracing of the other end ( ) of the brake belt ( ) causes the brake belt ( ) to be pressed against the brake drum ( ) from the inside and produces a braking moment. The invention has the advantage that a friction force exerted on the brake belt ( ) by the brake drum ( ) augments the thrust on the end ( ) of the brake belt ( ) and thus boosts the braking moment. Another advantage is that the brake belt ( ) always rests uniformly against the brake drum ( ) over its entire circumference, even, for example, when the brake drum ( ) expands due to heating.

Drum brake system

A brake pressure control device is described. The device includes a pneumatic brake booster which has at least two chambers that are separable from each other. At least one of the chambers can be operated as a low-pressure chamber and at least another one of the chambers can be oerated as a working chamber. The device further includes a master braking cylinder in which a master cylinder pressure is generated over the pneumatic brake booster, and a hydraulic unit, which is installed between the master cylinder and at least one wheel brake cylinder of at least one wheel. The hydraulic unit includes an arrangement of switchable valves as well as least one pump. A hydraulic boost of the brake pressure is achievable with the assistance of the hydraulic unit. A wheel brake cylinder pressure may be generated in the at least one wheel brake cylinder with the assistance of the hydraulic unit, the wheel brake cylinder pressure being greater than the master cylinder pressure. A drive input point can be determined at which the hydraulic unit is activated taking into account the time-related derivation of the master cylinder pressure, the differential pressure between the pressure in the working chamber and the ambient pressure when the brake pedal is unactivated, as well as of the time-related derivation of the differential pressure between the pressure in the working chamber and the ambient pressure.

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Karlsbad, Germany

Hanniel Schmidt