Abstract: Disclosed is a wheel cylinder and a drum brake having the same, in which the number of position as well as other elements accompanied with the piston may be reduced, resulting in reduced manufacturing cost.

Abstract: Braking assembly for a reel-holder flange in textile apparatus, comprising a fixed flange connected to the arm for supporting the reel, at least a first and a second braking shoe supported by the fixed flange, each having an external arched lateral face which defines a braking surface for a corresponding internal annular braking band of the reel-holder flange. A drive is provided for driving the braking action which comprise at least a first and a second thrust device provided between the first and second braking shoe at the facing and opposite ends of the braking shoes, with the thrust devices which act on the braking shoes in a direction circumferential to the latter to move them apart one from the other and create a displacement in diverging radial directions of the shoes towards and against the coupling band of the reel-holder flange.

Abstract: The invention is drum brake assembly having a dual brake actuator. A piston-cylinder assembly forms the primary brake actuator, and a lever member, together with the piston-cylinder assembly, forms a composite structure which acts as a secondary brake actuator. The lever member pivots about an axis substantially parallel to the axis of rotation of the drum, and the lever member is contained within the drum brake assembly. The piston-cylinder assembly is operable independent of the composite structure to actuate the brake.

Abstract: A parking brake system comprising a drum brake (200) comprising two shoes (206) outwardly movable relative to a friction surface of a drum (224); an activation device (220, 222) for generating an activation force to move the shoes outwardly to a first position into contact with the drum sufficiently to prevent the drum; a solenoid activated linkage mechanism (230, 240; 322, 352) is provided for maintaining the shoes substantially in the first position.

Abstract: A drum brake comprises two brake shoes (4,5) which are operable hydraulically and/or mechanically. A first brake shoe (4) is supported trailingly in forward travelling direction and leadingly in backward travelling direction. In the forward travelling direction both brake shoes (4,5) are supported trailingly so as to obtain soft response behavior. And a lever (7) is supported at the second brake shoe (5), having one arm pressurized by the piston (2) of the wheel brake cylinder (1), while the other arm (7b) acts directly or indirectly on the first brake shoe (4).

Abstract: The invention relates to a hydraulically operable brake, in particular, a servo brake, with a brake carrier arranged secure against turning on the vehicle, a wheel cylinder fastened to the circumferential zone of the brake carrier, which wheel cylinder is connected over hydraulic lines with a pressure medium source, an automatic resetting device fastened to the circumferential zone of the brake carrier lying opposite the wheel cylinder, a brake-jaw bracing angle piece fastened to the brake carrier, two brake jaws, the oppositely lying ends of which abut on the piston of the wheel cylinder and on the threaded bolts of the readjusting device, and with restoring springs that engage on the brake jaws and on the brake carrier.

Abstract: An internal shoe-drum brake is disclosed in which a pair of arcuate shoes can be applied to a rotatable drum by an hydraulic actuation system for normal service braking when the brake acts as a brake of the "two-leading" shoe type and a mechanical actuation system for parking or emergency braking when the brake acts as a brake of the "duo-servo" type. The hydraulic system comprises two hydraulic pistons, each of which acts on the leading end of a respective shoe, and first and second abutments are provided against which the trailing ends of the shoes are adapted to rest. One abutment is fixed but the other abutment includes an auxiliary hydraulic piston which is adapted to be urged against a fixed stop by hydraulic pressure applied to the pistons. The reaction from the trailing end of a respective shoe tends to urge the piston away from the stop, but the area of the piston is sufficient to prevent this happening when the hydraulic pressure is acting on the piston.

Abstract: Backing plates are normally bolted to wheel gear housings and brake shoes are normally biased against such backing plates. Hydraulic or pneumatic lines normally proceed externally of the housing and over the backing plate to connect with a wheel cylinder which motivates the brake shoes. Such hydraulic lines can be easily damaged. A wheel brake arrangement (10) is disclosed which eliminates external hydraulic or pneumatic lines and eliminates such a backing plate. At least one conduit (33) is formed within a housing (12). The conduit (33) is connected directly to a wheel cylinder (28). The wheel cylinder (28) is mounted to one end (24) of the housing (12). A biasing structure (50) can serve for biasing a brake shoe (26) into contacting relation with one end (24) of the housing (12). A piloting arrangement (49) can serve for properly aligning the wheel cylinder (28) to motivate the brake shoe (26) and to receive pressurized fluid from the conduit (33).

Abstract: In a drum brake, a wheel cylinder is located between a pair of adjacent shoe ends for a pair of brake shoes and a piston inserted into the wheel cylinder is slidably engaged through an anchor provided on a backing plate and further the piston is provided with a flange on the side thereof pressing a brake shoe so that the anchor is interposed between the flange of the piston and the wheel cylinder, and, furthermore, a strut is located between the other pair of adjacent shoe ends for the pair of the brake shoes in order to lighten a weight of the brake and facilitate a disassembly and assembly of the brake.

Abstract: A wheel cylinder in a brake assembly includes a housing for movably carrying a pair of pistons. An intermediate wall of the housing separates the pair of pistons from each other and cooperates with each piston to substantially form a first chamber facing one of the pistons and a second chamber facing the other piston. An inlet communicates fluid pressure to the chambers via a first path and a second path within the housing. A pressure responsive member is disposed within one of the paths and is biased to a position opening communication through the one path. When the fluid pressure within one of the chambers reaches a predetermined value, the pressure responsive member is movable to restrict fluid communication to the one chamber while the fluid pressure within the other chamber is free to increase in value during actuation of the wheel cylinder.

Abstract: A drum brake comprising a backplate. A pair of wheel cylinders and a pair of brake shoes are arranged on the front face of the backplate. The wheel cylinders are interconnected to each other via the brake oil tube. The brake oil tube extends from one of the wheel cylinders towards the other cylinder along the rear face of the backplate and is arranged to be spaced from the rear face of the backplate. A tube supporting member made of elastic non-metallic material is inserted between the central portion of the brake oil tube and the rear face of the backplate.

Abstract: A drum brake is provided with a pair of brake shoes having axially inner and outer webs for supporting friction linings. A backing plate mounts the pair of brake shoes by providing radially outwardly extending lugs which are disposed between the inner and outer webs to prevent axial movement of the pair of brake shoes. Moreover, springs are disposed between respective lugs and portions extending between the webs to bias the portions into engagement with recesses on the backing plate. A double hydraulic actuator is positioned between the pair of braking shoes with one actuator cooperating with the inner webs and the other actuator cooperating with the outer webs during a braking application to urge the friction linings into engagement with a drum. The inner and outer webs also include slots substantially opposite the double hydraulic actuator for receiving plates which mount an adjustment mechanism between the pair of brake shoes.

Abstract: A wheel brake assembly in which the webs of brake shoes are held in a planar alignment between and supported by a pair of parallel-spaced interconnected supporting plates, in turn supported by an axle or spindle. A pair of brake contracting springs interconnect the brake shoes, and these springs are positioned with one spring being against the outer surface of each plate. An inner edge of each of the plates is circular and independently adapted to attach to an axle housing, whereby the brake assembly may be readily welded to an axle housing.

Abstract: In an actuator assembly for a vehicle brake a follower member normally operated by a wedge to apply a brake comprises a pair of hydraulic pistons working in a common bore in a housing, and the housing is provided with a supply port communicating with a pressure space defined between the adjacent ends of the pistons which abut when the wedge is displaced, and with an abutment face with which the innermost piston is engageable when the wedge is in its retracted position and the pressure space is pressurized.