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An ABS hydraulic modulator suitable for vehicular applications is provided. The design utilizes an electric motor which powers a hydraulic pump unit used to recirculate brake fluid during ABS operation. The hydraulic circuit components also include a normally closed ABS release solenoid valve, an in

An ABS hydraulic modulator suitable for vehicular applications is provided. The design utilizes an electric motor which powers a hydraulic pump unit used to recirculate brake fluid during ABS operation. The hydraulic circuit components also include a normally closed ABS release solenoid valve, an integral spring-loaded piston accumulator, an isolation valve and check arrangement, a number of strategically placed flow control orifices and an optional hydraulic damper assembly.

대표청구항 ▼

A brake system modulator having a master cylinder port, a wheel brake port and a bore comprising: an isolation valve assembly including a piston slidably carried in the bore and having a first side and a second side, and including an obturator engageable with the first side of the piston and a sprin

A brake system modulator having a master cylinder port, a wheel brake port and a bore comprising: an isolation valve assembly including a piston slidably carried in the bore and having a first side and a second side, and including an obturator engageable with the first side of the piston and a spring engaging a spring side of the obturator biasing the obturator toward the piston with a first chamber defined in the bore on the first side of the piston, a second chamber defined in the bore on the second side of the piston and a third chamber defined in the bore on the spring side of obturator; an ABS release solenoid valve movable between a closed and an open position and communicating with the bore at the second chamber on the second side of the piston through a first conduit extending from the isolation valve assembly to the ABS release solenoid valve; a pump having an outlet check valve; a continuously open flow path through the modulator between the master cylinder and the wheel brake port including an ABS apply orifice assembly with a thin element having an opening forming an ABS apply orifice positioned in the continuously open flow path; and a second conduit extending from the ABS apply orifice to the first chamber of the isolation valve assembly wherein when the ABS release solenoid valve is moved to the open position to effect a pressure reduction at the wheel brake port the continuously open flow path remains open in both directions between the master cylinder port and the wheel brake port.