초록

A valve assembly having normally opened and normally closed valves controlled by solenoids to provide various connected and disconnected arrangements in a fluid system. It is particularly useful in a wheel lock control or anti-skid brake system (ABS).

대표청구항 ▼

A solenoid valve assembly having a housing, a pressure inlet, a pressure outlet, and an exhaust port, said assembly comprising: a first solenoid having a first solenoid actuatable plunger; a second solenoid having a second solenoid actuatable plunger in axial alignment with said first solenoid and p

A solenoid valve assembly having a housing, a pressure inlet, a pressure outlet, and an exhaust port, said assembly comprising: a first solenoid having a first solenoid actuatable plunger; a second solenoid having a second solenoid actuatable plunger in axial alignment with said first solenoid and plunger; a plunger stop and guide member comprising a stop element positioned axially intermediate said plungers and first and second tubular guides secured to and extending from said stop element with said first plunger and said second plunger being respectively reciprocably received therein, said stop element having an axially extending bore therethrough and oppositely extending first and second plunger springs respectively urging said first and second plungers axially away from said stop element; a first valve housing having normally open first valve means, axially spaced from said first solenoid, therein fluidly intermediate said pressure inlet and said pressure outlet and having a valve closing member secured to said first plunger and movable therewith when said first solenoid is energized to close said first valve means; passage means in said first valve housing in axial alignment with said first plunger and maintaining continuous fluid communication between said pressure outlet and said axial passage in said stop element through said first tubular guide; normally closed second valve means including a valve seat in said second tubular guide in axially spaced relation to said stop element with said second plunger positioned axially therebetween, a valve element formed on said second plunger and normally seated on said valve seat to close said second valve means and axially movable when said second solenoid is energized to open said second valve means, said second plunger having a passage therethrough providing fluid communication with said stop element axial passage to said valve element, and a restrictive orifice passageway extending through said valve seat and in fluid communication with said release port; said solenoids being selectively energizable and deenergizable to selectively open and close said first and second valve means and thereby control the fluid pressure in said outlet in pressure apply, pressure hold, pressure release, and air bleed modes.