A roll and brake automatic test system and method are provided. The system includes a preset roll and brake tester in which a vehicle is disposed at a preset position and which is set to test a travel state of the vehicle. A remote controller then tests travel performance and brake performance by operating the vehicle remotely.

Various examples of brake actuators are provided. In one example, a brake actuator includes a parking brake chamber defined by a spring housing and an adapter base. The parking brake chamber includes a parking diaphragm that has an opening and the parking diaphragm is disposed between the spring housing and the adapter base which divides the brake spring chamber into a spring volume and a release volume, with the spring volume of the brake spring chamber being sealed from atmosphere. The parking brake chamber also includes a piston that is disposed in the spring volume and is in contact with the parking diaphragm, and the piston includes a piston passageway through the piston to allow air flow between the release volume and the spring volume.

A pneumatic spring brake cylinder is provided for brake systems of vehicles, including a housing in which a spring brake piston loaded by an accumulator spring and connected to a spring brake piston tube is guided in a movable manner, and an emergency release device for the emergency release of the spring brake piston in the event of a drop in pressure. The emergency release device contains a spindle which can be rotated relative to the spring brake cylinder and which can be screwed in a nut that is held in a rotationally fixed manner in the spring brake piston tube by a form-fitting connection. The nut interacts with an axial stop on the spring brake piston in order to trigger a release movement against the effect of the accumulator spring. The formfitting connection is formed between an outer polygonal profiled section of the outer circumference of the nut in a circumferential direction and a complementary circumferential inner polygonal profiled section on the inner circumference of an intermediate bushing and between an outer polygonal profiled section of the outer circumference of the intermediate bushing in the circumferential direction and a complementary circumferential inner polygonal profiled section on the inner circumference of the spring brake piston tube.

A disc brake apparatus that holds brake pads (46) and is capable of holding a caliper body (30) in a part of the support is provided with a support in which pairs of torque receiving parts (16, 18) provided in both sides in a braking force tangential direction and connecting parts (20) respectively connecting together the torque receiving parts (16, 18) are provided in both sides in an axial-direction of a rotor. In the support, at least one of the torque receiving parts (16, 18) is capable of being divided. The support (12) includes an open part capable of inserting and removing the brake pads (46) in the braking force tangential direction by dividing the torque receiving parts.

A disc brake apparatus that holds brake pads (46) and is capable of holding a caliper body (30) in a part of the support is provided with a support in which pairs of torque receiving parts (16, 18) provided in both sides in a braking force tangential direction and connecting parts (20) respectively connecting together the torque receiving parts (16, 18) are provided in both sides in an axial-direction of a rotor. In the support, at least one of the torque receiving parts (16, 18) is capable of being divided. The support (12) includes an open part capable of inserting and removing the brake pads (46) in the braking force tangential direction by dividing the torque receiving parts.

A spring-type brake cylinder that includes a compression spring, a pressure chamber, a dividing wall disposed between the compression spring and the pressure chamber, a piston having an inner wall and a bottom, and a nut disposed inside the piston and configured to be held on a release bolt. A support structure is disposed inside the piston and configured to abut against the nut while the release bolt is screwed into the nut. The piston comprises a first retaining structure and a second retaining structure, the first retaining structure configured to hold the support structure in an assembly position and the second retaining structure configured to hold the support structure in a drive position. The support structure is moveable from the assembly position to the drive position by a movement of the nut relative to the piston.

A spring-loaded brake actuator includes a push rod that can be coupled to a braking element of a brake, an energy accumulator which is designed to apply a braking force onto the push rod via a coupling mechanism, a drive, which is designed to hold the push rod in a brake release position against the force of the energy accumulator, and an auxiliary release device, with which the transmission of the braking force from the energy accumulator to the push rod can be blocked independently of the drive, in which the coupling mechanism has two coupling members which are in engagement with one another via a claw clutch, and in that the auxiliary release device has an actuating element which is designed to bring the claws of the claw clutch into a non-engaged position in a direction of movement transverse to the force transmission direction.

This invention is related to improving the sealing of the adapter plate inside the spring brake actuator and to improving the bearing of the intermediate shaft and the adapter plate. The invention is related to a new design regarding the bearing section providing sealing between the intermediate shaft and the adapter plate, which is a part of the spring brake actuator. The present invention is related to the development of two pieced bearing member having different hardness and being produced from different materials one of which is a rigid plastic piece which prevents force losses and decreases lateral loads, and the other of which is the rubber means.

Disclosed is an air-operated brake actuator, including: a hollow upper housing; a hollow lower housing spaced apart from the upper housing in a lower direction; a coupling housing configured to couple and restrain the upper housing and the lower housing to each other; a piston disposed in the upper housing to divide an inside of the upper housing into a spring chamber and a pressure chamber disposed below the spring chamber; a hollow actuator rod disposed in the piston; a casing bolt head disposed at a lower end of the actuator rod and having an air flow hole formed therein; a pilot lip seal fixed to an outer surface of the casing bolt head to seal an outer end of the air flow hole; and a compression spring installed in the spring chamber.

An electropneumatic brake control device controls a parking brake of a vehicle with a service brake and the parking brake. It includes an electromagnetic valve device which can be supplied with compressed air from a compressed air storage via a storage connection; a parking brake signal connection for inputting parking brake signals output by an electric parking brake signaling device; and an air quantity-boosting valve device which is pneumatically controlled by the electromagnetic valve device and which has a working outlet that can be connected to a first outlet connection for at least one spring applied brake cylinder. A control air line is provided between an outlet of the electromagnetic valve device and a pneumatic control inlet of the air quantity-boosting valve device. A pneumatically controlled 2/2-way valve has an inlet which can be connected to the control air line or the working outlet of the air quantity-boosting valve device, an outlet which is connected to a pressure sink, and a pneumatic control connection for a stored pressure of the service brake. The pneumatically controlled 2/2-way valve has two positions: a conducting position, which is smaller than a specified threshold value in the event of a stored pressure of the service brake and in which the inlet is connected to the outlet, and a blocking position, which is larger than a specified pressure threshold in the event of a stored pressure of the service brake and in which the inlet is blocked from the outlet.