Patent ID: 8020660

Claim:
A pump device having a physical layout comprising: a pump element housed within a pump housing and configured to pump a working oil; an electric motor configured to drive the pump element; a reservoir tank installed on the pump housing and configured to reserve the working oil supplied to the pump element; a pair of main passages formed within the pump housing, with each main passage having an elongated cavity to channel a main flow of the working oil from the pump element to an oil-pressure-driven drive component; and a control valve assembly spanning across the pair of main passages and provided in a control valve cavity within the pump housing, and configured to control a flow of the working oil caused to flow through the pair of main passages, wherein an intermediate position along the elongated cavity of each of the main passages, has a cross-section as taken perpendicularly to a longitudinal axis of the elongated cavity, which partially intersects a cross-section of the control valve cavity at a control valve cavity length embodying the control valve assembly therein in order for an intersecting cavity space to be commonly shared by the elongated cavity and the control valve cavity, and the intersecting cavity space serves as a communication channel for the working oil to travel between the elongated cavity and the control valve cavity, and wherein the pair of passages are connected on one side thereof to the pump element and on an other side thereof to the oil-pressure-driven drive component with the intersecting cavity space provided at the intermediate position.