Abstract:
A movable wall assembly for use in a servomotor having a resilient diaphragm with a bead radially compressed in a groove on a hub by a backing plate to form a seal between a vacuum chamber and a power chamber. The diaphragm correspondingly axially urges the wall assembly into contact with the hub to prevent relative movement therebetween.
Abstract:
A servomotor having a first valve for controlling the communication of vacuum and air at atmospheric pressure and a second valve for controlling the communication of air above atmospheric pressure to move a wall in response to a created pressure differential. A plunger moved by a push rod will progressively operate the first and second valves to provide a substantially uniform force for operating a brake actuator. A check valve located in the flow path of the air at atmospheric pressure will prevent the air above atmospheric pressure from being diverted to the atmosphere upon operation of the second valve.
Abstract:
A bearing and seal combination for use in pressurizing section of a servomotor which supplies hydraulic fluid under pressure to a braking system. The bearing and seal combination will align and permit a push rod to move a piston in response to a pressure differential being created across a movable wall. The bearing and seal combination will prevent air from being communicated into the pressurizing section during a first condition and fluid under pressure from escaping from the pressurizing chamber during a second condition.
Abstract:
An electrical control for operating a vacuum powered pumping device which supplies fluid under pressure to operate a spring braking device. A pressure operating signal is communicated to the electrical control and an indicator to inform the operator of the operational pressure mode in the supply system. If a low pressure mode signal is generated, a temperature responsive switch sequentially interrupts the electrical energy flow to the electrical control. By interrupting the electrical energy flow to the electrical control, the pumping device will reciprocate and increase the pressure in the system causing the pressure mode signal to change. With a change in the pressure mode signal indicating a higher pressure, the electrical energy flow to the control will be terminated.
Abstract:
A check valve for a power braking system having a housing containing a flexible member in a control chamber. The flexible member overlies an inlet to the system and permits fluid flow only from the system to the control chamber. An outlet port is connected to the vacuum of the manifold of an automobile. A tubular projection adjacent an opening in the control chamber contains a ball member which is loosely held in position by a pin member in the projection. The loosely held ball member will permit present at the manifold resulting from the operation of the car and carried to the control chamber to escape to the atmosphere around the ball without damaging the system.