Hydro-pneumatic brake actuator arranged to maintain a...

Details Hydro-pneumatic brake actuator arranged to maintain a... Hydro-pneumatic brake actuator arranged to maintain a...

B - Operations, Transporting

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B61H 15/00 (2006.01) F16D 65/72 (2006.01) F16D 65/74 (2006.01)

Patent

CA 1149759

(Case No. 7085) ABSTRACT OF THE DISCLOSURE A hydro-pneumatic brake actuator arranged with a slack adjuster piston and one-way check valve device in the hydrau- lic 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 appli- cation. 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.

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