An S-cam brake including a brake chamber to which compressed air is supplied; a slack adjuster rotatably connecting to the brake chamber; an S-cam unit having an S-cam connecting to and rotating around the slack adjuster; and a drum having a lining generating braking force with widening according to rotation of the S-cam is provided, wherein the brake chamber includes an upper housing having an air supply port through which compressed air is introduced; a lower housing coupled to the upper housing to form an internal space; a diaphragm having edges fixed to the upper housing and the lower housing and deformed by compressed air; a piston disposed to contact the diaphragm and move linearly; a piston push rod extending from the piston and having one end connected to the slack adjuster; and a spring having one end supported by the piston and the other end supported by the lower housing, wherein a thickness of the upper housing is greater than a thickness of the lower housing.

A heavy vehicle drum brake shoe guide and an assembly comprising the brake shoe guide are described. In one aspect, there is provided a brake shoe guide for attachment to a drum brake shoe by a pin fastener, to prevent brake shoe misalignment. There is also provided a brake shoe guide assembly including at least a brake shoe guide and a pin fastener for securing the brake shoe guide to a drum brake shoe. The brake shoe guide described herein is simple to fit to a standard, off the shelf brake shoe, and can be retrofitable to a brake shoe and/or brake assembly. Moreover, the brake shoe guide assembly described herein can retain the cam follower roller to the brake shoe, and act as an axle for the cam follower roller, eliminating the need for a separate retainer clip. Further still, the guide and the assembly of which it forms a part can be used with drums of various sizes.

A knuckle for a heavy-duty vehicle self-steering axle/suspension system that includes integrally formed structure for mounting components of a drum brake system. The knuckle includes a spindle that is welded directly to the knuckle and a discrete tie rod arm bolted to the knuckle.

The invention concerns a rail vehicle braking system comprising a service brake having a movable piston (8) which with a body (2) of the system delimits a service brake chamber (13) supplied by a first source, a piston rod (21) disposed in that chamber and fastened to a second side (32) of the piston turned towards that chamber, and a parking brake (7) disposed in said body and comprising a blocking device (20) disposed in that chamber and movable to act on said rod, and a movable actuating device (23, 24) which is configured to be electrically actuated; said blocking and actuating devices being configured to immobilize/unblock said rod so as to block/unblock said piston in a position.

A pneumatic brake actuator has a spring brake actuator with spring and spring brake pressure chambers, and a service brake actuator with service brake pressure and pushrod chambers. A control valve has a seal that is moveable between an open position and a closed position for regulating fluid flow between the spring chamber and service brake pressure chamber. A first surface of the seal is in fluid communication with the service brake pressure chamber and a second surface of the seal is in fluid communication with a valve chamber that is not in fluid communication with the service brake pressure chamber or spring chamber. The seal moves between its open and closed positions based on a pressure in the service brake pressure chamber. Movement of the seal is not dependent on the rate of flow of fluid between the spring chamber and the service brake pressure chamber.

A brake actuator for railway vehicles, comprising: a main body having a braking chamber, a service braking piston movable with respect to the main body along a longitudinal axis, a pair of levers articulated to the main body and bearing respective brake pads, a transmission mechanism including an auxiliary body, a pair of thrust elements articulated to said levers, a pair of carriages movable with respect to the auxiliary body along a transverse direction perpendicular to said longitudinal axis, and a pair of slack adjusters each of which is disposed between a respective carriage and a respective thrust element, wherein the transmission mechanism comprises a floating member, which is free to pivot with respect to the service braking piston about an axis perpendicular to said longitudinal axis and to said transverse axis, wherein the floating member carries a first and a second pair of thrust bearings which cooperate with cam surfaces of said carriage.

An S-cam brake includes an S-cam unit for braking a drum, where the S-cam unit includes an S-cam of an S shape having an involute tooth profile at left and right sides thereof, and horizontal tangential members forming contacting surfaces engaged with the involute tooth profile symmetrically around a center point of a circle at the left and right sides of the S-cam, and being spread at the left and right sides with normal lines of the contacting surfaces as a horizontal direction when the S-cam rotates.

A truck mounted braking system is provided with a mechanical pivot adjustment on the bake lever connected to the brake cylinder push rod to permit the braking force applied to the wheels to vary depending on the lading condition of the car, without involving additional pneumatic elements such as a pneumatic empty load device. The brake cylinder may be provided with a channel which permits the push rod to achieve different positions based on different positions of the brake cylinder push rod.

A brake cylinder dust cover is installed on a waterproof brake cylinder. The brake cylinder includes a brake cylinder body and a front cover. A waterproof dust cover assembly is arranged on the front cover. The waterproof dust cover assembly includes a dust cover fixedly connected to the front cover, and a filter felt support and a filter felt pad which are arranged in the dust cover. The filter felt support is connected with the dust cover, and the filter felt pad is fixed on the filter felt support. An outwards extending skirt is arranged at the edge of the dust cover in the axial direction thereof.

A brake actuator is disclosed having a transfer element configured to be moved along an actuating direction and to actuate a brake by moving into at least one actuating position; an actuating mechanism configured to move the transfer element into the at least one actuating position to actuate the brake, wherein the actuating mechanism is configured to be movable along the actuating direction; and a distancing mechanism configured to move the actuating mechanism from a non-operating position into an operating position along the actuating direction. The transfer element and the actuating mechanism are configured such that the transfer element is located in the actuating position when the actuating mechanism is located in the non-operating position.