| 摘要 |
An emergency and parking (E&P) brake system (6) is used with a brake system (2) of the type including an air brake coupled to a service brake actuator (8) by a slack adjustor (104) movable between brake released and brake applied positions. The E&P system includes an E&P actuator (80), located physically distant from the brake actuator, which has a variable volume spring brake chamber (82), a spring brake chamber diaphragm assembly (84) movable between first and second positions, a variable volume spring deflection compensation chamber (86), and a movable compensation chamber diaphragm assembly 88. A compression spring (90) is positioned between the two diaphragm assemblies. The spring brake chamber diaphragm assembly is connected to the slack adjustor by a flexible cable (110). The spring brake chamber is normally maintained in its first position by pressurizing the spring brake chamber. Depressurizing both chambers applies a lower, parking brake force through the cable and slack adjustor. By simultaneously pressurizing the compensation chamber and depressurizing the spring brake chamber, the compensation chamber diaphragm assembly recompresses the spring to apply a higher, emergency braking force.
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