A bi-directional converter between pressure and rotational force, comprising:
- first and second rotation members, disposed next to each other while overlapping a portion of each of outer circumference tracks thereof, having different rotation shafts, each of the outer circumference tracks being in a circular cylinder shape;
- a circumference outer wall adjacent to the outer circumference track of each of the first and the second rotation members;
- a side surface outer wall, adjacent to a side surface of each of the rotation members, serving as a surface in a direction perpendicular to the rotation shafts of respective the rotation members;
- an enclosed space formed by each of the first and second rotation members, the circumference outer wall, and the side surface outer wall;
- and
- a supply exhaust path communicating an inner side of the circumference outer wall with an outer side of the side surface outer wall,
- wherein one of the rotation shafts of the first and the second rotation members rotates in such a manner to synchronize with the other rotation member rotating in the opposite direction,
- wherein each of the first and the second rotation members includes a protrusion portion serving as an outer protrusion, being adjacent to the circumference outer wall, and protruding from a base in a substantially circular shape, and includes a convex portion, serving as an inner protrusion, disposed at an inner circumference side relative to the outer circumference track, the convex portion of one of the first and second rotation members becoming adjacent to the outer protrusion of the other of the first and second rotation members in a course of engagement of the first and the second rotation members,
- wherein the outer protrusion of the first rotation member is curved in a retard direction with respect to a rotation direction and forms an arc at a front surface of the outer protrusion in the rotation direction while forming a recess in a curve shape from a rotation direction rear surface to a tip of the inner protrusion of the outer protrusion so as to form a curve surface successively adjacent to the outer protrusion of the second rotation member in contact with the first rotation member,
- wherein the outer protrusion of the second rotation member is curved in an advance direction with respect to a rotation direction and forms an arc at a rear surface of the outer protrusion in the rotation direction while forming a recess in a curve shape from the front surface of the outer protrusion in the rotation direction to a tip of the inner protrusion of the outer protrusion so as to form a curve surface successively adjacent to the outer protrusion of the first rotation member in contact with the second rotation member,
- wherein adjacency of the tip of the outer protrusion of the second rotation member and the curve surface of the first rotation member and adjacency of a surface of the arc of the outer protrusion of the second rotation member and the curve surface of the tip of the inner protrusion of the first rotation member form two adjacent enclosed space in the course of engagement of the first rotation member and the second rotation member adjacent to each other,
- wherein adjacency of the outer protrusion of the second rotation member and the curve surface of the first rotation member makes an adjacent movement moving toward the outer protrusion from the inner protrusion,
- wherein adjacency of the circumference outer wall and the outer protrusion of the first rotation member, adjacency of the circumference outer wall and the outer protrusion of the second rotation member, and adjacency of the first rotation member and the second rotation member are formable of three adjacent enclosed space, and
- wherein a volume change of the enclosed space by rotation of the first and the second rotation members is converted into a pressure difference, and volume of the enclosed space is changed by the pressure applied from outside the enclosed space to convert into the rotational force of the first and the second rotation members.