Patent ID: 8197238

Claim:
A pump apparatus comprising: a drive shaft supported rotatably in a pump body; a power transmission member attached to one end portion of the drive shaft, and configured to transmit a power to the drive shaft; a pump element received in the pump body, and configured to pressurize and discharge a working fluid by receiving a rotary drive of the drive shaft; a discharge passage formed in the pump body, and configured to introduce the pressurized working fluid discharged from the pump element to an external of the pump body; a control valve provided in the pump body, and configured to control an amount of working fluid to be discharged through the discharge passage to the external, by controlling a movement of a valving element of the control valve on the basis of the pressurized working fluid; and an electromagnetic valve provided between the power transmission member and the control valve in an axial direction of the drive shaft, and configured to control the control valve or a fluid pressure acting on the valving element of the control valve based on the pressurized working fluid.