Brakes – Position adjusters – Slack
Patent
1984-11-19
1986-06-17
Halvosa, George E. A.
Brakes
Position adjusters
Slack
188170, 188196A, 188196D, 188351, 192111A, F16D 6556, F16D 6574
Patent
active
045950830
ABSTRACT:
A disk brake actuator having a hydraulic slack-adjusting arrangement for maintaining a positive clearance between a brake shoe and a brake disk, includes a cylinder housing having disposed therein a brake-applying spring section, a hydraulic-operated release section, and an actuator piston spindle arrangement operably-connected to the spring section by way of a clutch arrangement. A flange, formed on the actuator piston, acts as a plunger during a brake application and draws a first amount of hydraulic fluid into a first storage area, such first amount corresponding in volumn to the clearance between the brake disk and brake shoe when a nonworn brake shoe is first used. Upon release of the brake, the actuator piston forces the hydraulic fluid back into a second storage area wherein is included a shuttle member movable with a shuttle chamber. Additional hydraulic fluid is drawn from a reservoir when actuator piston movement, beyond the original clearance value, occurs as a result of brake shoe wear. The additional hydraulic fluid corresponds in volumn to that amount of brake shoe wear and remains in the first storage area upon brake release, thus maintaining the actuator piston at the original clearance distance relative to the brake shoe and brake disk. The additional volumn of hydraulic fluid is prevented from returning to the reservoir by a check valve. A bleed screw in the reservoir allows bypassing the check valve when new brake shoes are installed and the additional hydraulic fluid must be returned.
REFERENCES:
patent: 2385625 (1945-09-01), Hopmans
patent: 2952338 (1960-09-01), Oswalt
patent: 3118520 (1964-01-01), Jernstrom
patent: 3441111 (1969-04-01), Spalding
patent: 3647030 (1972-03-01), Burnett
patent: 3661230 (1972-05-01), Burnett
patent: 4267903 (1981-05-01), Kita et al.
Digweed Thomas
MacKenzie Robert
Halvosa George E. A.
Hawranko G. E.
WABCO Ltd.
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