Load-dependent braking force adjuster with electromagnetic control - adapts closing pressure to vehicular load by variation of travel of pistons into contact with spring

摘要

Two identical units are mounted one behind the other with their stepped pistons (4) actuated by a common balance beam (15) rocking about a control plunger (16) fixed to a hollow cylinder (17), which protrudes into a sleeve (19) surrounding the electromagnet plunger (29). Under lighter loading the coil (31) carries more current, retracting the armature (30) so that ball-bearings (28) can move inwards and the pistons (4) travel further to make contact with the adjustment spring (24) when the brake fluid pressure is built up. ADVANTAGE - Only relatively weak electromagnet with low voltage and small coil is required.