Abstract: A drum brake apparatus includes: a housing; a main braking part installed on one side of the housing, and driven by hydraulic pressure so as to press a shoe during main braking; and a parking braking part installed on another side of the housing, and driven by an electromotive force of an actuator so as to press the shoe during parking braking. The housing includes: a housing part; a piston housing part formed on the housing part, having a hollow portion formed therein, and having the main braking part installed therein; and a rod housing part formed on the housing part, having a hollow portion formed therein, and having the parking braking part installed therein. The rod housing part is disposed at a location farther from a rotation center of the shoe than the piston housing part.

Abstract: A brake actuator for an aircraft braking system, comprising a housing, a sleeve, an annular member mounted to the housing extending radially inwardly for engagement with the ratchet teeth of the sleeve, a piston slidable along an axis (X), a piston head disposed at a first end of the pin portion, a cap disposed at a second end of the pin portion for operative engagement with a brake element of the housing, and a second position in which the piston head is drivingly disengaged from the sleeve.

Abstract: An improved electromechanically drivable spreader unit having an integrated adjustment apparatus for a drum brake, in which the linear motion of brake shoe holders is produced by two ball-ramp devices, wherein a first ball-ramp device includes a first actuation piston arranged for rotation about the axis and a second ball-ramp device includes a second actuation piston arranged for rotation about the axis, and wherein an adjustment apparatus for compensating an actuation travel that increases as a result of wear on the friction linings is arranged in an axially centered position within the housing and substantially between the actuation pistons.

Abstract: A lining wear adjustment device for a disc brake with a brake application device having a brake actuating lever, which can preferably be inserted into an adjustment spindle of the disc brake, includes an adjusting shaft with an external bearing, a rotary drive element and a clutch device for switchable coupling of the rotary drive element to the adjusting shaft. The clutch device is an electrically controllable solenoid clutch with at least one electromagnetic coil.

Abstract: A disc-brake unit (10) for vehicles on rails, comprising a brake pincer consisting of a pair of jaws (14), provided with relative friction gaskets (16), intended to rub on the two opposite surfaces of a disc (12). The jaws (14) are hinged at one of the ends of a pair of levers (18). The levers (18) are pivoted on respective hinges (20) fixedly connected to the main body of the braking unit (10), and are actuated by a braking force motor (22) provided with at least one first piston (26) that moves with alternate motion along an axis (A). The braking unit (10) also comprises a group (68) for automatically regulating the clearances between the friction gaskets (16) and the disc (12).

Abstract: An actuator for a drum brake including a plunger connected through a resilient member to a linkage attached to a web on a brake shoe. A rod extends from the plunger and engages a lever arm that is pivotally retained on the web. The lever engages an extendable strut of an adjuster arrangement through which a running clearance is maintained between the brake shoe and a drum. During a brake application, pressurization fluid acts on the plunger to develop an operational force that is communicated through the resilient member to move the brake shoe into engagement with a drum. Should the operational force overcome the resilient member, the plunger moves toward the linkage and a reactive force is applied through the rod that acts through the lever arm to prevent a pawl from rotating such that a current length of the strut and correspondingly a current running clearance is sustained.

Abstract: A brake cylinder device with an effective adjustment bolt processing and with an improved air bleeding effect, wherein an adjustment bolt (40) as a component of an automatic shoe clearance adjustment mechanism, wherein an external thread stem (40a) makes an irreversible engagement with a piston (22), performing brake shoe expansion, and a brake fluid feeding groove (40b) is formed on a periphery of the external thread stem (40a) is designed to be spiral.