| 摘要 |
A pressure-energized seal for a spring-type brake actuator for a vehicl e brake, in which the actuator's power spring is located between the service brake actuator and parking brake release actuator. The power spring is captured between the actuator's intermediate flange and a spring retainer. In order to preven t pressure leakage past the spring retainer into a power spring cavity, a pressure-energized seal is located between the plate and the housing. The se al member, which is carried by the spring plate or the housing, has a pressure-receivin g section with resilient outer portions, which are deflected by pressure in the servic e chamber into firm contact with the spring plate and the actuator housing interior wall, increasing the sealing force between the seal and both the plate and the housing. The pressure-energized seal provides improved seal performance with a seal which is easy to inspect and/or replace, highly reliable, and relatively inexpensive.
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