Brakes – Position adjusters – Slack
Patent
1980-06-02
1982-03-16
Reger, Duane A.
Brakes
Position adjusters
Slack
60590, 188153R, F16D 6572
Patent
active
043196713
ABSTRACT:
A hydro-pneumatic brake actuator arranged with a slack adjuster piston and one-way check valve device in the hydraulic path between a hydro-pneumatic actuator and a power piston, to which a friction brake element is connected for engagement with a vehicle wheel tread or brake disc during a brake application. During a brake release, the one-way check valve closes a passage through the slack adjuster piston to cause the piston to shift from its one extreme position to the other extreme position with the fluid flow, as the hydro-pneumatic actuator is moved from its application position to its release position. This in turn draws hydraulic fluid from the power piston chamber into a clearance volume created by shifting of the slack adjuster piston, and accordingly forces the power piston to retract a predetermined distance corresponding to the capacity of the clearance volume and the effective area of the power piston, thereby maintaining a constant brake shoe clearance during brake release.
REFERENCES:
patent: 3837443 (1974-09-01), Clemmons et al.
patent: 3913328 (1975-10-01), Shaffer
patent: 4068746 (1978-01-01), Munechika
Porteous David A.
Smith Eric G.
Falce G. J.
Reger Duane A.
WABCO Ltd.
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