A spring brake actuator is for braking a wheel of a vehicle and has a push rod assembly having a base located in a service brake chamber and a push rod extending from a service brake chamber. Pneumatic activation of the spring brake actuator causes the push rod to further extend out of the service brake chamber to thereby engage a wheel brake with a wheel of the vehicle. Pneumatic deactivation of the spring brake actuator causes the push rod to retract back into the service brake chamber to thereby disengage the wheel brake from the wheel of the vehicle. The push rod extends between a first end portion that is fixed to the base and an opposite, second end portion that is removably coupled to the first end portion so that the second end portion is manually attachable and detachable from the push rod assembly.

A brake actuator assembly including a pressure plate presenting an opening, a push rod that is coupled to the pressure plate, a diaphragm that is coupled to the pressure plate, and a retainer that engages the push rod. The push rod has an outer surface and at least one protrusion extending outward from the outer surface. The retainer engages the protrusion such that at least a portion of the diaphragm is positioned between the pressure plate and the retainer.

A bushing assembly is provided for a spring brake actuator of a vehicle air braking system. The bushing assembly comprises a single-piece bushing member made of a material that is homogenous throughout the bushing member. The bushing member includes a first rib structure that faces one axial direction of the bushing member and a second rib structure that faces an opposite axial direction of the bushing member.

A spring brake actuator having a push rod plate and a diaphragm. A rim projects from the diaphragm for engaging a housing containing the push rod plate. A sidewall is connected to the rim, which is connected to a bottom surface, forming an outer diameter of the diaphragm. Flanges, perpendicular to the diaphragm, extend from the diaphragm forming an inner diameter for which the push rod plate is inserted into. An adhesive is placed between the diaphragm and the push rod plate, wherein the adhesive maintains an attachment and a seal between the diaphragm and the push rod plate keeping the diaphragm and the push rod plate in line with each other.

A vehicle spring brake having a parking brake housing that defines a parking brake chamber and a service brake housing that defines a service brake chamber. A flexible membrane separates the parking brake chamber from the service brake chamber and flexes into and out of the service brake chamber based upon a pressure differential between an air pressure in the parking brake chamber and an air pressure in the service brake chamber. A pushrod extends out of the service brake housing when the flexible membrane flexes into the service brake chamber and retracts into the service brake housing when the flexible membrane flexes back out of the service brake chamber. A control valve controls the pressure differential to thereby control movement of the flexible membrane and the pushrod.

A bushing assembly is provided for a spring brake actuator of a vehicle air braking system. The bushing assembly comprises a single-piece bushing member made of a material that is homogenous throughout the bushing member. The bushing member includes a first rib structure that faces one axial direction of the bushing member and a second rib structure that faces an opposite axial direction of the bushing member.

A brake actuator assembly including a pressure plate presenting an opening, a push rod that is coupled to the pressure plate, a diaphragm that is coupled to the pressure plate, and a retainer that engages the push rod. The push rod has an outer surface and at least one protrusion extending outward from the outer surface. The retainer engages the protrusion such that at least a portion of the diaphragm is positioned between the pressure plate and the retainer.

Provided is a novel pressure pulsation reducing device of a hydraulic system that reduces a stress generated in a metal diaphragm and is excellent in durability. A plurality of concentric recess portions projecting toward an interior space of a pulsation damping member is formed on one of metal diaphragms, and a plurality of concentric recess portions projecting toward the interior space of the pulsation damping member is formed on the other metal diaphragm likewise. When a predetermined pressure is applied to the metal diaphragms, at least one recess portion of one of the metal diaphragms and at least one recess portion of the other metal diaphragm are in contact with each other.

The present disclosure relates to a double-lip seal of a pneumatic spring brake chamber for a vehicle, the double-lip seal has sealing performance between an inner circumferential surface of a through-hole of an adaptor housing and an outer circumferential surface of an actuator rod to prevent degradation in sealing performance of the lip seal, thereby maintaining constant sealing performance and preventing fluid leakage.

The present disclosure relates to an engagement structure of a push rod guide and a push rod guide cover of a brake chamber for a vehicle, in which a pair of semi-circular, hingedly connected, half members in a shape of a plate are assembled at a side surface of an axial direction of the push rod into a shape of a disk, a push rod opening is formed at the center of the disk to guide a movement of the push rod, a protrusion projecting upwards is provided at a central part of the push rod guide, forming a step in a radial direction of the push rod guide, and a receiving groove corresponding to the step is formed on an inner circumferential surface of the push rod guide cover and is connected to the step.