For controlling electromechanically actuatable brakes of servo type construction, it is necessary to detect the forces acting on the abutment of the brake shoes. The abutment is therefore formed from a massive material which deforms under load, wherein measurement devices are provided which detect this deformation. The shape of the abutment is selected in such a way that the abutment has measurement gaps, the size of which changes when the abutment is loaded. The size of the measurement gaps can be sensed by means of Hall sensors or AMR sensors, for example.

The rotation-actuated drum brake uses both inner and outer sets of brake shoes, which are actuated in a radial manner, to contact the inner and outer surfaces of a cylindrical brake drum. The inner and outer sets of brake shoes are disposed within an annular brake housing and are constrained to move radially. An actuator selectively drives rotation of a rotating disc having a plurality of arcuate slots defined therein. This drives roller guides of the inner and outer sets of brake shoes to roll within respective ones of the arcuate slots. The driven rolling of the roller guides drives the radial motion of the inner and outer sets of brake shoes to simultaneously frictionally engage the inner and outer surfaces of the cylindrical brake drum.

An adaptive centrifugal brake assembly is disclosed. The adaptive centrifugal brake assembly controls rotational speed of a shaft. The brake assembly is adaptive and changes braking force based at least in part on torque applied to the shaft and/or the speed of rotation of the shaft. In some embodiments, the adaptive centrifugal brake assembly includes an adaptive mechanism such as a leaf spring that enables the assembly to be adaptive.

The invention concerns a centrifugal positive blocking brake for shutter drives. The brake includes centrifugal blocks, central spring element, and a drive motor comprising a drive shaft. A turntable is coupled with the drive shaft. The central spring element having a preloaded spring is centrifugally guided in a recess of the turntable. Either side of the spring is connected with a radially movable engaging tab element. Two different radially acting abutments are disposed on the central spring element and are movable towards recess. The engaging tab element has at least one engaging tab pointing radially inwards. The centrifugal block is attached to the engaging tab element. In the de-energized state of the drive motor, the engaging tab elements together with the centrifugal blocks disposed on them engage into detents of a frame-fixed detent disc with at least one engaging tab in a frictionally and positively locking manner. When voltage is applied and the drive motor starts, the engaging tabs disengage, the individual centres of mass of the central spring element, preloaded spring, the engaging tab element, the engaging tab, and two centrifugal block parts are on one symmetry axis. This invention creates a centrifugal positive blocking brake which is small in size and constructively simple and causes locking of the shutter when de-energized.

The invention concerns a centrifugal positive blocking brake for shutter drives. The brake includes centrifugal blocks, central spring element, and a drive motor comprising a drive shaft. A turntable is coupled with the drive shaft. The central spring element having a preloaded spring is centrifugally guided in a recess of the turntable. Either side of the spring is connected with a radially movable engaging tab element. Two different radially acting abutments are disposed on the central spring element and are movable towards recess. The engaging tab element has at least one engaging tab pointing radially inwards. The centrifugal block is attached to the engaging tab element. In the de-energized state of the drive motor, the engaging tab elements together with the centrifugal blocks disposed on them engage into detents of a frame-fixed detent disc with at least one engaging tab in a frictionally and positively locking manner. When voltage is applied and the drive motor starts, the engaging tabs disengage, the individual centres of mass of the central spring element, preloaded spring, the engaging tab element, the engaging tab, and two centrifugal block parts are on one symmetry axis. This invention creates a centrifugal positive blocking brake which is small in size and constructively simple and causes locking of the shutter when de-energized.

The present invention relates to an unpowered braking device using centrifugal force. The present invention may comprise: a housing; a brake drum installed inside the housing; a plurality of braking links rotatably installed on a rotating shaft of the housing and connected such that both ends thereof can expand and contract by means of centrifugal force; brake rollers provided on both ends of the braking links, respectively, such that, when the braking links expand, the brake rollers are forced against the inner walls of the brake drums and thereby generate braking force/torque; and an elastic member for providing elastic force such that both ends of the braking links, which have expanded, can contract.

A slack adjuster is provided for a drum brake of a vehicle air braking system. The slack adjuster comprises a gear set including (i) a worm wheel having an outer circumferential surface, and (ii) a worm shaft having a longitudinal central axis and meshed with the worm wheel. The worm shaft is rotated in one direction about its longitudinal central axis when the drum brake is applied and adjustment is required and in an opposite direction about its longitudinal central axis when the drum brake is released. The slack adjuster further comprises an anti-reversing member having an inner circumferential surface facing the outer circumferential surface of the worm wheel. The anti-reversing member allows rotation of the worm wheel when the drum brake is applied and prevents rotation of the worm wheel when the drum brake is released.

A slack adjuster is provided for a drum brake of a vehicle air braking system. The slack adjuster comprises a gear set including (i) a worm wheel having an outer circumferential surface, and (ii) a worm shaft having a longitudinal central axis and meshed with the worm wheel. The worm shaft is rotated in one direction about its longitudinal central axis when the drum brake is applied and adjustment is required and in an opposite direction about its longitudinal central axis when the drum brake is released. The slack adjuster further comprises an anti-reversing member having an inner circumferential surface facing the outer circumferential surface of the worm wheel. The anti-reversing member allows rotation of the worm wheel when the drum brake is applied and prevents rotation of the worm wheel when the drum brake is released.

An internal expanding shoe brake comprises expansion pistons (17) for forcing opposing brake shoes (2) apart. In each expansion piston (17) one adjusting pin (30) is axially movably arranged and presses against a brake shoe web (4) by means of a pressure piece (34). Said pressure piece (34) is supported on the adjusting pin by means of a ball joint so as to pivot in any direction. In order to prevent the adjusting pin (30) from being twisted inside the expansion piston (17), an anti-rotation element is provided and comprises a pressure piece projection (39) which projects over the ball joint surface (36) of the pressure piece (34), said projection interlockingly engaging in a receiving opening (40) of the adjusting pin (30) with lateral play and forming a rotational coupling connection.

An internal expanding shoe brake comprises expansion pistons (17) for forcing opposing brake shoes (2) apart. In each expansion piston (17) one adjusting pin (30) is axially movably arranged and presses against a brake shoe web (4) by means of a pressure piece (34). Said pressure piece (34) is supported on the adjusting pin by means of a ball joint so as to pivot in any direction. In order to prevent the adjusting pin (30) from being twisted inside the expansion piston (17), an anti-rotation element is provided and comprises a pressure piece projection (39) which projects over the ball joint surface (36) of the pressure piece (34), said projection interlockingly engaging in a receiving opening (40) of the adjusting pin (30) with lateral play and forming a rotational coupling connection.