Anti-lock brake system three way direct drive valve

Abstract

An automatic breaking system which functions by applying a controlled breaking pressure signal through a control valve to each of the four corners of an automotive vehicle in response to input and feedback signals. A centralized computer receives various signals generated by transducers positioned at various positions within the vehicle including at each of the four corners as well as input signals from the vehicle brake peddle. These signals are processed by the computer and then applied through a control system to a direct drive valve which meters the application of the fluid under pressure to the breaks located at each corner of the vehicle. Direct drive valve is a limited angle rotary to linear direct drive valve which includes a housing having a first bore longitudinally disposed therethrough and a second bore disposed transversely therethrough and intersecting the first bore. A valve spool is slidably disposed within a second bore for controlling the flow of fluid under pressure. A motor is disposed within the first bore and includes a limited angle rotary shaft having an eccentrically disposed pin extending therefrom into engagement with a slot and a spool. A spring is disposed within the second bore and continuously urges the spool into engagement with the pin. As signals are applied to the motor the valve spool reciprocates and causes flow of fluid under pressure as above specified.