BRAKE HYDRAULIC-VACUUM DRIVE FOR VEHICLE OPERATING WITH TRAILER Russian patent published in 1995 - IPC

FIELD: automotive industry; vehicle brake systems. SUBSTANCE: control valve unit 11 has convex inner plate 24 made in form of truncated cone with ribbed surface and installed on piston 16 for adjustment in height. Secured in housing is outer concave plate 25 made in form of concave truncated cone with ribbed surface and engaging with its ribs with ribs of plate 24. Diaphragm 26 thrusts against projecting parts of mated ribs of plates 24 and 25 and it has outer bead for sealing the housing arranged at place where parts of housing are connected to each other. EFFECT: enhanced efficiency of trailer-train brake systems owing to provision of combined control over brakes of truck and trailer. 2 dwg