ELECTROPNEUMATIC PRESSURE MODULATOR Russian patent published in 1997 - IPC

FIELD: automotive industry; antilocking devices of vehicle brake systems; control valve arrangements for automatically changing compressed air pressure in brake system to prevent wheel locking. SUBSTANCE: electropneumatic pressure modulator has housing with inlet, outlet and discharge channels with fitted in pneumatically controlled valves providing communication of outlet channel with inlet and discharge channels. Shutoff members of pneumatically controlled valves are made in form of flexible diaphragms limiting the control spaces connected, through channels and corresponding normally closed and normally open electromagnetic valves, with inlet channel. Housing has two pairs of concentrically arranged spaces divided by cylindrical partition with circular groove made over partition on housing surface. Circular groove communicates with above-indicated spaces through channels at both sides of partition. Spaces of one pair are connected by channels with corresponding inlet and outlet channels and spaces of second pair, with outlet and discharge channels Circular groove is made above circular groove of housing on surface of each cover mated with housing. Diaphragm of each pneumatically controlled valve is made flat, with ring corrugation, limiting, together with circular groove of covers, the control spaces connected by channels in covers with inlet channel of modulator. EFFECT: enhanced operation reliability. 2 dwg