Abstract: A brake assembly for a vehicle. The brake assembly may have a brake wing that includes a panel, a first flange, and a second flange. The first and second flanges may extend from the panel such that the second flange extends from the first flange.
Abstract: A drum brake has cylinders symmetrically fixed to a stationary member. Each cylinder has an axial bore therein with a groove for retention of a seal. A piston engages each seal to define chambers that receive pressurized fluid. Webs for friction members have a first end pined to an opposite cylinder and a second end connected to an opposite piston and to each other by a strut. Pressurized fluid acts on the pistons to move the second ends with respect to the first ends and simultaneously bring the friction members into engagement with a drum to effect a brake application. The seals acts on and return the pistons to a rest position in an absence of pressurized fluid. A pawl on a lever is moved into engagement with the strut to bring the first and second friction members into engagement with the drum to manually effect a brake application.
Abstract: This invention relates to an improved structure for a wheel cylinder for use in a drum brake assembly having a pair of brake shoes which are adapted to be urged into frictional engagement with a brake drum. The wheel cylinder includes a pair of opposed piston assemblies each having a piston body formed from a plastic material and a piston insert formed from metal. In accordance with one embodiment of this invention, the piston insert is molded in situ with the piston body and the piston insert includes a radially outwardly extending first flange and a radially outwardly extending second flange. The first flange defines a first flange outer diameter, and the second flange defines a second flange outer diameter which is less than the first flange outer diameter.
Abstract: A shoe driving mechanism for a drum brake for pressing brake shoes against a drum is formed as an assembly in which the following are assembled to base plates which are rotatably fitted to an anchor pin for a primary shoe: an anchor pin for the secondary shoe; first and second lever supporting pins; a balance lever which is swingably supported by the first and second lever supporting pins whose distal-end side outer periphery is brought into contact with one end of the primary shoe; and an input lever for transmitting to the balance lever and the secondary shoe a shoe operating force inputted from an operating-force generating mechanism.
Abstract: Disclosed is a drum brake device in which during a service brake application, a pair of brake shoes operates in a leading/trailing mode, and during a parking brake application, a parking brake mechanism operates to cause the brake shoes to operate in the duo servo mode. A first lever, an equalizer and a second lever, which make up the parking brake mechanism, are all assembled onto one of the brake shoes. The second lever includes an input portion, a lever contact portion and an equalizer contact portion. The input portion receives a force from a parking lever. The lever contact portion applies a turning force to the first lever. The equalizer contact portion applies a turning force to the equalizer. The second lever, when it is turned, turns the first lever and then the equalizer.
Abstract: A drum brake device having a single brake shoe mounted to be movable on top of the back plate. One end of the brake shoe abuts against an anchor (10) and the other end interlocks with a shoe clearance adjustment device (14). A link (11) is supported so as to pivot in the central region of the brake shoe (3). One end of the link (11) is interlocked so as to be activated by a service brake actuator (12) itself activated when the service brake is applied, while the other end of the link (11) abuts against the anchor (10). When the brake drum is rotating in one direction, the other end of the brake shoe (3) is supported by the anchor (10), and when the brake drum is rotating in the reverse direction, the one end of the brake shoe (3) is supported by the shoe clearance adjustment device (14).
Abstract: A brake cylinder is disclosed featuring a reduction of weight and a construction for reducing a tendency to vibrate. The piston (11), serving for the brake actuation, is formed out of a plastic mold part and is furnished with a simplified guiding of the piston. A pressure piece (44) serves for the transfer of the braking force, and is formed at the brake cylinder as a plastic mold part for allowing a relatively large distance from the brake drum. The new brake cylinder can be used advantageously for vehicles with wedge expanding brakes, where the brake force is transmitted by and applied with a pressure agent.
September 30, 1991
Date of Patent:
December 28, 1993
WABCO Westinghouse Fahrzeugbremsen GmbH
Bruno Kotarra, Horst Mylius, Wolfgang Pohl, Momcilo Ristic
Abstract: A wheel cylinder and torque plate construction is provided for a drum brake. The wheel cylinder comprises a molded plastic cylindrical member in a steel shell. The steel shell can be part of a torque plate which can be stamped in two parts which are substantially identical and then affixed together. The torque plate parts have semicylindrical shells which form the wheel cylinder shell when the parts are assembled. The plastic cylinder can be molded in the shell in a suitable die or mold in a plastic molding machine.
Abstract: A drum brake is disclosed in which at least two, and preferably four, friction pad assemblies are symmetrically arranged with respect to the drum. The pad assemblies are slidably guided for movement towards and away from the drum in a substantially radial direction on drag-taking abutments in a relatively stationary drag-taking member, and the pad assemblies are applied to the drum by levers upon which actuators act.
September 4, 1980
Date of Patent:
September 21, 1982
Brian Ingram, David A. Harries, Ramamurthy Natarajan