US 8,448,755 B2Granted

Disk brake

AssigneeRobert Bosch GmbH

InventorsDietmar Baumann, Dirk Hofmann

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Abstract

The invention relates to a disk brake with an electromechanical actuator which, for example, has a piezo-element, and with a hydraulic self-energizing device. In order to control the self-energizing effect, the invention provides a valve hydraulically between an auxiliary piston of the self-energizing device and a brake piston of the disk brake with which the brake piston can be hydraulically isolated from the auxiliary piston. This means that the self-energizing effect of the disk brake can be switched off. Using a modulated valve control and/or use of a proportional valve, the level of the self-energizing effect can be controlled or regulated. In order to avoid a blockage, the invention additionally provides a blockage protection valve with which the auxiliary piston or the brake piston can be connected to a hydraulic accumulator at ambient pressure.

Claims15

Dependent claims

A disk brake, comprising:

a friction brake lining;
a brake disk;
a brake piston configured to press the friction brake lining against the brake disk, the brake piston being disposed within a brake piston cylinder bore and including a piston face that is acted upon hydraulically within the brake piston cylinder bore;
an auxiliary piston which is displaceable parallel to the brake disk within an auxiliary piston cylinder bore, the auxiliary piston cylinder bore being connected hydraulically with the brake piston cylinder bore through a hydraulic line, the friction brake lining being displaceable transversely and parallel to the brake disk and being braced in a circumferential direction on the auxiliary piston;
and
a valve disposed in the hydraulic line between the auxiliary piston cylinder bore and the brake piston cylinder bore,
wherein the brake piston cylinder bore is hydraulically connected to receive brake fluid from a master cylinder through at least a portion of the hydraulic line such that the disk brake is travel-boosting, and the auxiliary piston has a restoring spring which has a spring force that acts counter to a force exerted on the auxiliary piston by the friction brake lining when the disk brake is actuated, and
wherein the spring force is on an order of magnitude of a force exerted on the auxiliary piston by the friction brake lining when the disk brake is actuated to prevent locking of the brake disk.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/518,939Filed 29 Nov 2007
Priority: DE 10 2006 058 75012 Dec 2006
Published: US 2010/0032249 A111 Feb 2010
Granted: 28 May 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

B60T 8/52
Responsive to a speed condition, e.g. acceleration or deceleration: torque sensing, i.e. wherein the braking action is controlled by forces…
F16D 65/18
Arranged in or on the brake: adapted for drawing members together , e.g. for disc brakes
F16D 2066/005
Arrangements for monitoring working conditions, e.g. wear, temperature: force, torque, stress or strain
F16D 2066/006
Arrangements for monitoring working conditions, e.g. wear, temperature: without direct measurement of the quantity monitored, e.g. wear or…