SEALED BEARING FOR FLUID-OPERATED BRAKE ACTUATOR

摘要

An air operated combination diaphragm spring brake (10) has a brake actuator (14) in tandem with a spring brake actuator (16), wherein the brake actuator (14) and spring brake actuator (16) are separated by a dividing wall (35) in which is formed an annular opening (37, 37', 37") having a sealed bearing (38) through which a spring brake actuator rod (56, 56', 56") reciprocates. The sealed bearing (38, 38', 38") further comprises a polymer ring (84, 86, 108, 110, 118) and an elastomeric sealing member (96, 114, 124). The ring (84, 86, 108, 110, 118) has an annular groove (92, 112, 120) which receives the elastomeric sealing member (96, 114, 124). The relationship between the diameter of the aperture (39, 39', 39") in the sealed bearing (38, 38', 38") and the diameter of the annular opening (37, 37', 37") in the dividing wall (35) is such that it prohibits the spring brake actuator rod (56, 56', 56") from contacting any portion of the dividing wall (35) during reciprocation.