초록 ▼

An electro-pneumatic brake system with a pressure control valve switched ahead of the brake cylinders is proposed, which connects the brake cylinders either with outside air or with a storage tank. The pressure control valve is directly operable by an electro-magnet or, in the case of its loss, by a

An electro-pneumatic brake system with a pressure control valve switched ahead of the brake cylinders is proposed, which connects the brake cylinders either with outside air or with a storage tank. The pressure control valve is directly operable by an electro-magnet or, in the case of its loss, by an operating piston and is formed as a double-seat valve with large flow-through diameters. It can be combined with stop valves in order to make possible a multichannel pressure control. The compressed brake system is intended for use in motor vehicles, especially in utility vehicles.

대표청구항 ▼

1. In an electro-pneumatic brake system including at least one storage tank and brake cylinders supplied thereby, which comprises a pressure control valve which controls air passage from said at least one storage tank to the brake cylinders, said pressure control valve including a body having an inl

1. In an electro-pneumatic brake system including at least one storage tank and brake cylinders supplied thereby, which comprises a pressure control valve which controls air passage from said at least one storage tank to the brake cylinders, said pressure control valve including a body having an inlet and at least one outlet, a double-seat valve including a first valve seat on said body between said inlet and said at least one outlet and an axially aligned movable closing body, said movable closing body including a central passage and a second valve seat on an end thereof, a portion of which seats against said first valve seat to separate said inlet from said at least one outlet, an axially aligned attachment within said valve body operable to seat against said second valve seat on said closing body thereby closing said central passage and adapted to move said movable closing body away from said first valve seat, an electro-magnet secured to said valve body, said electro-magnet including an armature with a stem attachment in axial alignment with said attachment which exerts a force on said movable closing body for directly controlling said movable closing body in accordance with an electrical current applied to said electromagnet, and a compressed air operating piston means in axial alignment with said armature, said piston means including an axially aligned stem and operative to exert a force on said armature for movement of said armature relative to said attachment and said movable closing body of said double-seat valve in the event said electromagnet is inoperative whereby said double seat valve is operated by said armature by application of an electrical current to said electro-magnet and in the event said electrical current is inoperative, said compressed air operated piston will physically move said armature for operation of said double-seat valve. 2. A brake system according to claim 1 wherein said doubleseat valve is actuated together with the electromagnetic actuation. 3. A brake system according to claim 1 wherein said double-seat valve is actuated by said compressed air operating piston following the electromagnetic actuation. 4. A brake system in accordance with claim 1, further comprising, a dual circuit means having a dual-circuit brake value transducer for controlling said pressure control valve and an electric control for said electro-magnet for operating as a primary control for said system. 5. A brake system in accordance with claim 4, wherein said electro-magnet comprises means for being excited in two discrete levels of potential, and said double-seat valve has a means defining a magnetically controlled center position in which both single valve means of the double-seat valve are closed. 6. A brake system in accordance with claim 5, wherein said armature of the electro-magnet is stressed by said compressed air operating piston in a position in which the armature is in the current-actuated end position of the electro-magnet. 7. A brake system in accordance with claim 1, wherein said electro-magnet comprises means for being excited in two discrete levels of potential, and said double-seat valve has a means defining a magnetically controlled center position in which both single valve means of the double-seat valve are closed. 8. A brake system in accordance with claim 7, wherein said armature of the electro-magnet is stressed by said compressed air operating piston in a position in which the armature is in the current-actuated end position of the electro-magnet. 9. A brake system in accordance with claim 8, further comprising an anti-skid protective means, pressure stop valve means, wherein the pressure control valve is combined with said pressure stop value means. 10. A brake system in accordance with claim 1, wherein said armature of the electro-magnet is stressed by said compressed air operating piston in a position in which the armature is in the current-actuated end position of the electro-magnet. 11. A brake system in accordance with claim 10, further comprising an anti-skid protective means, pressure stop valve means, whereby the pressure control valve is combined with said pressure stop valve means. 12. A brake system in accordance with one of claim 1, further comprising an anti-skid protective means, pressure stop valve means, whereby the pressure control valve is combined with said pressure stop valve means. 13. A brake system in accordance with claim 12, wherein said pressure stop valve means comprises means flanged to a housing means for the pressure control valve. 14. A brake system in accordance with claim 12, wherein the pressure stop valve means comprises means inserted into the lines leading to the brake cylinders.