| 摘要 |
PURPOSE: A motor for an electronically controlled brake system is provided to prevent overload of a motor by decreasing reciprocation stroke of a piston with modifying an eccentric shaft of the motor, and to reduce pulsation of pressure and noise by decreasing hydraulic pressure. CONSTITUTION: An anti-lock brake system includes a modulator block(31) forming a pump mounting bore; pumps(40L,40R) pressurizing and discharging oil in braking by reciprocating a piston(41) in the bore; and a motor(35) installed in the modulator block and composed of an eccentric shaft(35b) formed in the end of a rotating shaft(35a) to linearly reciprocate the piston of the pump. The eccentric shaft is deformed elastically for the axis of the rotating shaft to reduce reciprocation stroke of the piston in increasing discharge pressure. Overload of the motor is prevented, and pulsation of oil pressure is reduced by varying the stroke distance of the piston according to discharge pressure of the pump. Oil is discharged properly by restoring the eccentric shaft and reciprocating the piston normally after decreasing discharge pressure.
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