| 摘要 |
A self adjusting drum brake actuator having a plunger (22) with a cup-like cavity (29) the open end of which projects towards the mouth (27) of the bore (26), and has an adjuster (28) located in the cavity (29) to vary the overall length of the plunger (22) and maintain a substantially constant clearance between the brake shoe linings (15) and the drum (16). The adjuster (28) comprises at least three co-axial telescopic parts (31), (32) and (33) which are relatively rotatable and are connected one-to-another by screw thread means (36), (38), (41) and (42) and the axial outward movement of each of the two inner parts (32), (33) is limited by a respective abutment (39) or (44) thereon.
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