F - Mech Eng,Light,Heat,Weapons – 16 – D
Patent
F - Mech Eng,Light,Heat,Weapons
16
D
188/184
F16D 65/56 (2006.01) F16D 65/60 (2006.01)
Patent
CA 1233761
AUTOMATIC SLACK ADJUSTER FOR VEHICLE BRAKES ABSTRACT A slack adjuster for a cam actuated brake system is disclosed in which the change of angularity of the brake applying push rod relative to the actuating arm during brake application is used for sensing stroke length and effecting adjustment to compensate for brake wear. The adjusting mechanism comprises a pull rod and a gear rack coupled together by a lost motion connection. The lost motion distance corresponds with the normal stroke length of the brake applying push rod when the brake linings have the normal clearance. A pinion meshes with the gear rack and is coupled to an adjusting shaft through a one-way clutch. The adjusting shaft carries a worm which drives a worm gear to reposition the actuating shaft of the brake system to compensate for brake wear. When the brake is applied, any overtravel of the lost motion represents brake wear and the overtravel is memorized by the position of the gear rack. This movement of the gear rack causes the one-way clutch overrun the shaft and the shaft is not rotated. When the brake is released, the gear rack is moved in the other direction an amount corresponding to the overtravel and the one-way clutch drives the adjusting shaft to reposition the actuating shaft to compensate for the brake wear.
467712
Cumming James C.
Meredith & Finlayson
LandOfFree
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