TANDEM TYPE VACUUM SERVOBRAKE Russian patent published in 1995 - IPC

FIELD: automobile brake systems. SUBSTANCE: servobrake has chambers 22, 24 divided by fixed plate 20. Each chamber is divided by piston 26, 28 and insulating diaphragm in which at least inner surface has shoulder 38. Pistons 26, 28 are connected by movable sleeve 42 with valve gear; front compartment piston 26 is connected by means of cylindrical sleeve. According to invention, sleeve 42 has circular groove 32 over its perimeter. Fitted into groove are, respectively inner end 34 of piston 28 rear compartment 24 and shoulder 36 of cylindrical sleeve 30, and shoulder 38 of diaphragm 40 of rear compartment 24 providing interlocking of unit. EFFECT: enhanced reliability of operation. 1 dwg