Rotary fluid transmission device

A rotary fluid transmission device comprising:

• a rotor, a drive shaft, a first holder, and a second holder;
• wherein the first holder is matingly connected with the second holder, the first holder includes a circular bush accommodated therein, and the first holder includes an annular chamber surrounding the circular bush, the rotor includes a C-shaped piston received in and being eccentric to the annular chamber, the drive shaft is configured to drive the C-shaped piston to make an orbiting motion without rotating in the annular chamber, and the C-shaped piston has an external face and an internal face, wherein the external face tangentially contacts with an inner fringe of the annular chamber, and the internal face tangentially contacts with an outer wall of the circular bush, such that the annular chamber has a first reservoir defined between the internal face and the circular bush, and the annular chamber has a second reservoir defined between the external face and the inner fringe;
• wherein the first holder is connected with a circular seat which reciprocately swings within an angle range, and the circular seat includes two clamp arms extending into the annular chamber therefrom, wherein a respective clamp arm is rotatably engaged with a blade, and a dotted line passes through a center of the C-shaped piston and a center of the annular chamber, the two clamp arms, and the blade, wherein the center of the C-shaped piston is defined between the center of the annular chamber and the blade, and the blade includes two abutting faces, a respective abutting face is parallel to the dotted line, and the dotted line passes through the respective abutting face, the C-shaped piston has two edge faces, the two edge faces are located on two ends of the C-shaped piston, and a respective edge face contacts with the respective abutting face, such that the C-shaped piston makes an orbiting motion without rotating along the center of the annular chamber, the respective edge face reciprocately slides with respect to the respective abutting face, and the blade moves vertically along the dotted line back and forth, thus operating the rotary fluid transmission device smoothly;
• wherein the first holder includes two first conduits and two second conduits, the two first conduits are in communication with the first reservoir and are adjacent to two sides of the circular seat and the inner fringe of the annular chamber, and the two second conduits are in communication with the second reservoir and are adjacent to the two sides of the circular seat and the inner fringe of the annular chamber, such that fluids flow into and out of the annular chamber.