| 摘要 |
PURPOSE: A spring brake actuator assemblies which allows for the delivery of more force to the push rod without increasing the size of the actuator unit is provided. CONSTITUTION: The brake actuating unit for providing increased force without increasing the maximum outside dimension of said unit comprises a housing with first and second end walls and a generally cylindrical side wall between the end walls, a single piece elastomeric diaphragm suspended within the housing and being sealingly attached to the side wall to form at least one chamber therein, a circular pressure plate horizontally deployed in the housing and having a generally flat surface adjacent to the diaphragm, the pressure plate being associated with a brake actuating rod disposed in the housing and extending through a centrally disposed opening in the first end wall for reciprocating movement relative to the housing, wherein the side wall has a substantially vertical orientation relative to the pressure plate, the outside circumferential edge of the pressure plate extends substantially to the inside edge of the cylindrical side wall leaving a gap therebetween, and wherein the edges of the diaphragm attached to the side wall are capable of stretching substantially vertically when the diaphragm is fully expanded.
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