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US 2013/0075211 A1Published application
Parking Brake Piston for a Parking Brake Chamber
AssigneeBendix Spicer Foundation Brake LLC
InventorsRonald S. Plantan, Brett S. Darner
Life of this patent
Estimating the term…
Abstract
A spring-type brake actuator for a pneumatically-operated vehicle brake is provided, in which the parking brake release piston is formed from at least one stamped actuator piston plate, preferably a stamped aluminum plate. Preferably the biasing force of the power spring of the spring brake actuator bears on a stamped spring seat cap element which is interposed between the power spring and the stamped actuator piston plate. In addition, the parking brake release piston flexible diaphragm may be captured between the stamped actuator piston plate and a stamped backing plate by affixing the backing plate to a joining member, where the joining member includes a threaded insert to receive a manually-actuated parking brake release actuation tool.
Claims24
A spring brake actuator, comprising:
- an actuator intermediate flange member;
- a spring housing configured to be affixed to a first side of the actuator intermediate flange member to form a parking brake actuator chamber;
- a service brake housing configured. to be affixed to a second side of the actuator intermediate flange member opposite the first side;
- a parking brake release piston comprising a stamped piston plate and a flexible diaphragm, the parking brake release piston being configured to divide the parking brake actuator chamber into a parking brake release chamber on an intermediate flange side of the parking brake release piston and a power spring chamber on an opposite side of the parking brake release piston;
- a parking brake actuating power spring arranged in the power spring chamber to bias the parking brake release piston away from a rear wall portion of the spring housing;
- and
- a spring seat cap having at least a flange region arranged to transfer power spring biasing force between the power spring and the parking brake release piston.
4 more elements
A parking brake release piston, comprising:
- a flexible diaphragm configured to divide a parking brake actuator chamber of a spring brake actuator into two chambers;
- a stamped piston plate;
- a backing member;
- and
- a joining member,
- wherein the flexible diaphragm is captured between the stamped piston plate and the backing member when the joining member is affixed to the backing member.
3 more elements
A spring brake actuator, comprising:
- a power spring arranged in a spring housing to apply a biasing force biasing a parking brake release actuator in a brake application direction;
- a stamped spring seat cap having at least a flange region arranged to transfer the biasing force between the power spring and the parking brake release piston.
A parking brake release piston assembly, comprising:
- a flexible diaphragm configured to divide a parking brake actuator chamber of a spring brake actuator into two chambers;
- a stamped piston plate to which the flexible diaphragm is affixed;
- and
- a stamped spring seat cap having a flange region configured to receive a brake-end of a parking brake actuator power spring and being configured to abut an upper surface of the stamped piston plate.
1 more element
A vehicle brake assembly, comprising:
- a brake, wherein the brake includes one of a disc brake and a drum brake;
- and
- a spring brake actuator coupled to the brake to apply a brake actuation force, the spring brake actuator including
- an actuator intermediate flange member;
- a spring housing configured to be affixed to a first side of the actuator intermediate flange member to form a parking brake actuator chamber;
- a service brake housing configured to be affixed to a second side of the actuator intermediate flange member opposite the first side;
- a parking brake release piston comprising a stamped piston plate and a flexible diaphragm, the parking brake release piston being configured to divide the parking brake actuator chamber into a parking brake release chamber on an intermediate flange side of the parking brake release piston and a power spring chamber on an opposite side of the parking brake release piston;
- a parking brake actuating power spring arranged in the power spring chamber to bias the parking brake release piston away from a rear wall portion of the spring housing;
- and
- a spring seat cap having at least a flange region arranged to transfer power spring biasing force between the power spring and the parking brake release piston.
7 more elements
A vehicle axle assembly, comprising:
- a vehicle axle;
- a brake coupled to the vehicle axle, wherein the brake includes one of a disc brake and a drum brake;
- and
- a spring brake actuator coupled to the brake to apply a brake actuation force, the spring brake actuator including
- an actuator intermediate flange member;
- a spring housing configured to be affixed to a first side of the actuator intermediate flange member to form a parking brake actuator chamber;
- a service brake housing configured to be affixed to a second side of the actuator intermediate flange member opposite the first side;
- a parking brake release piston comprising a stamped piston plate and a flexible diaphragm, the parking brake release piston being configured to divide the parking brake actuator chamber into a parking brake release chamber on an intermediate flange side of the parking brake release piston and a power spring chamber on an opposite side of the parking brake release piston;
- a parking brake actuating power spring arranged in the power spring chamber to bias the parking brake release piston away from a rear wall portion of the spring housing;
- and
- a spring seat cap having at least a flange region arranged to transfer power spring biasing force between the power spring and the parking brake release piston.
8 more elements
A spring brake actuator, comprising:
- a parking brake release pressure chamber, wherein application of parking brake release pressure to the parking brake release pressure chamber biases a brake actuator power spring in a brake release direction;
- a service brake pressure chamber, wherein application of service brake pressure to the service brake pressure chamber displaces a brake actuator rod in a brake application direction;
- and
- a travel limiting member located on a service brake chamber side of an intermediate flange of the spring brake actuator, the travel limiting member being arranged to limit a motion of a parking brake release disposed on a parking brake release chamber side of the intermediate flange to a predetermined parking brake release piston fully withdrawn position.
1 more element
A spring brake actuator, comprising:
- an actuator intermediate flange member;
- a spring housing configured to be affixed to a first side of the actuator intermediate flange member to form a parking brake actuator chamber;
- a service brake housing configured to be affixed to a second side of the actuator intermediate flange member opposite the first side;
- a parking brake release means located within the parking brake actuator chamber for releasing a parking brake function of the spring brake actuator in response to application of fluidic pressure;
- and
- a parking brake actuating means located in the parking brake actuator chamber for applying the parking brake function
- wherein the parking brake release means includes stamped plate members.
4 more elements
A method of operating a spring brake actuator, comprising the acts of:
- providing a spring brake actuator, the spring brake actuator comprising:
- an actuator intermediate flange member;
- a spring housing configured to be affixed to a first side of the actuator intermediate flange member to form a parking brake actuator chamber;
- a service brake housing configured to be affixed to a second side of the actuator intermediate flange member opposite the first side;
- a parking brake release piston comprising a stamped piston plate and a flexible diaphragm, the parking brake release piston being configured to divide the parking brake actuator chamber into a parking brake release chamber on an intermediate flange side of the parking brake release piston and a power spring chamber on an opposite side of the parking brake release piston;
- a parking brake actuating power spring arranged in the power spring chamber to bias the parking brake release piston away from a rear wall portion of the spring housing;
- and
- a spring seat cap having at least a flange region arranged to transfer power spring biasing force between the power spring and the parking brake release piston;
- applying fluidic pressure to the parking brake release chamber to cause the parking brake release piston to compress the power spring;
- releasing the fluidic pressure in the parking brake release chamber to cause the power spring to displace the parking brake release piston away from the rear wall portion of the spring housing
7 more elements
Dependencies are inferred from the claim text.