Patent ID: 7922459

Claim:
A pressure-generating device comprising: a rotary member having a rotary shaft portion supported rotatably in a nonrotatable support member via a first bearing; a pumping member attached to the rotary shaft portion of the rotary member in a unitarily rotatable manner and in such a manner as to be able to perform a pumping action, and, in cooperation with the rotary shaft portion, forming a pump chamber therebetween; a motion-converting mechanism for converting a rotary motion of the rotary member in relation to the support member to the pumping action of the pumping member; a suction path formed in the rotary member and enabling introduction of fluid into the pump chamber; and a discharge path formed in the rotary member and enabling discharge of the fluid from the pump chamber, wherein the rotary shaft portion has a coaxially formed cylindrical bore which accommodates the pumping member therein so that the pumping member can reciprocate in an axial direction of the rotary shaft portion.