Spring-applied, hydraulically released brake actuator having positive clearance slack adjuster mechanism
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United States of America Patent
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-
Dec 31, 1991
Grant Date -
N/A
app pub date -
Jul 27, 1990
filing date -
Jul 27, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A spring-applied, hydraulic pressure released brake actuator having a modular slack adjuster assembly in which a friction ring is arranged to limit axial movement of a nut member to which a brake shoe is connected, thereby establishing a predetermined brake shoe clearance with a vehicle wheel or brake disc. A spindle that is threadedly engaged with the nut member is connected to the actuator piston by means of a cone clutch that is disengaged during a brake release in the event the return stroke of the piston exceeds the predetermined brake shoe clearance due to brake shoe wear during the preceding brake application. This disengagement of the clutch causes the spindle to be rotated relative to the nut member under the influence of a slack adjuster spring in order to compensate the piston overtravel.
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