Hydraulic pressure source apparatus and vehicle height control apparatus

A vehicle hydraulic actuator system comprising a hydraulic pressure source apparatus for generating a hydraulic pressure to be supplied to a hydraulic actuator mounted on a vehicle, said apparatus comprising:

• an oil chamber connected to said hydraulic actuator;
• a pressurizing chamber containing therein, in a sealed manner, a medium which varies between a gaseous state and a liquid state;
• a heating device which receives a coolant that cools a power source, and heats and evaporates the medium inside said pressurizing chamber, said power source being mounted on the vehicle,
• wherein the hydraulic pressure is generated by compressing said oil chamber by a vapor pressure of the medium inside said pressurizing chamber;
• an outer shell and an inner shell both constituting said heating device, wherein a space between said outer shell and said inner shell is constituted as a heating chamber through which the coolant flows along an axial direction, and wherein the inside of said inner shell is constituted as said pressurizing chamber;
• a fin member of corrugated plate shape disposed inside said heating chamber so as to contact said outer shell and said inner shell,
• wherein said fin member is provided with a plurality of openings for introducing the coolant flowing in a passage portion defined by said outer shell and said fin member into a passage portion defined by said inner shell and said fin member, and
• wherein the openings are open toward an upstream side of the flow of the coolant, and shaped to direct the coolant in a direction perpendicular to said axial direction.