| 摘要 |
A spring brake actuator which combines the advantages of piston and diaphrag m- type brake actuators having superior performance at reduced cost. The spring brake actuator includes a tubular flexible diaphragm (54) having one end (13 6) secured between the rim portions (132, 130, respectively) of the cup-shaped housing (28) and cover (32), and an inverted second end portion (58) which i s received around a rim portion of a cup-shaped piston (40) and secured in sealed relation with a flexible band (124). A power spring (52) is received within opposed cup-shaped portions of the piston and cover. A rim portion (4 6) of the piston is biased against a generally radial portion (36) of the cover , permitting use of a power spring having increased performance.
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