A fluid rotary machine with a decreased footprint and a reduction in the number of parts. The fluid rotary machine has four heads wherein double-headed pistons are disposed inside cylinders in a crisscross arrangement. The rotational balance between rotational parts including the double-headed pisto
A fluid rotary machine with a decreased footprint and a reduction in the number of parts. The fluid rotary machine has four heads wherein double-headed pistons are disposed inside cylinders in a crisscross arrangement. The rotational balance between rotational parts including the double-headed pistons is achieved only by first and second balance weights which are inserted and incorporated into both ends of a crank shaft coupled eccentrically to a shaft. The shaft is rotated for the double-headed pistons to linearly reciprocate in the cylinders. The fluid rotary machine has rotary valves for switching between the suction and discharge operations of the fluid for each cylinder chamber. The rotary valves are incorporated into a case to be coaxial and integrally rotatable with the shaft.
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1. A four-head fluid rotary machine comprising: a first crank shaft being eccentrically connected to a shaft, the first crank shaft being rotated about the shaft by a first imaginary crank arm which has a radius r; a piston composite body having an eccentric tube body constituted by a first tube bod
1. A four-head fluid rotary machine comprising: a first crank shaft being eccentrically connected to a shaft, the first crank shaft being rotated about the shaft by a first imaginary crank arm which has a radius r; a piston composite body having an eccentric tube body constituted by a first tube body, which is concentrically fitted to the first crank shaft, and second tube bodies, which are extended from respective axial ends of the first tube body and whose axes are second imaginary crank shafts eccentrically disposed with respect to an axis of the first tube body, a first double-headed piston, which is fitted in one of the second tube bodies, and a second double-headed piston, which is fitted in the other second tube body, the double-headed pistons being disposed inside cylinders in a crisscross arrangement, the piston composite body being rotated about the first crank shaft by a second imaginary crank arm which has a radius r; and first and second balance weights being inserted and incorporated into respective ends of the first crank shaft, wherein the double-headed pistons linearly reciprocate in the cylinders in a state where a first rotational balance relating to the first and second double-headed pistons around the second imaginary crank shafts, a second rotational balance relating to the piston composite body around the first crank shaft and a third rotational balance relating to the first crank shaft and the piston composite body around the shaft are achieved only by the first and second balance weights, said fluid rotary machine being characterized in that rotary valves switch between suction and discharge operations of a fluid for chambers of the cylinders, and that the rotary valves are incorporated into a case to be coaxial and integrally rotatable with the shaft. 2. The fluid rotary machine according to claim 1, wherein the rotary valves are suction valves and discharge valves. 3. The fluid rotary machine according to claim 1, wherein a passage groove whose width is partially varied is formed on an outer circumferential face of each of the rotary valves and extended in a circumferential direction, and a first fluid path, which communicates the passage groove to an external path, and a second fluid path, which communicates the passage groove to the cylinder chambers, are formed in the case. 4. The fluid rotary machine according to claim 2, wherein a passage groove whose width is partially varied is formed on an outer circumferential face of each of the rotary valves and extended in a circumferential direction, and a first fluid path, which communicates the passage groove to an external path, and a second fluid path, which communicates the passage groove to the cylinder chambers, are formed in the case. 5. The fluid rotary machine according to claim 3, wherein the rotary valves are integrated with the first and second balance weights, which are respectively incorporated into the axial ends of the first crank shaft, each of the passage grooves has a circular groove section, which has a prescribed width and formed on an entire outer circumferential face of the rotary valve, and a wide groove section, which is wider than the circular groove section, and the wide groove sections of the rotary valves are point-symmetrically formed with respect to the axis of the shaft. 6. The fluid rotary machine according to claim 3, wherein the rotary valve for discharge and the rotary valve for suction are integrated with the first and second balance weights, respectively, which are rotatably held by the case, and have a pair of the passage grooves, each of which has a circular groove section having a prescribed width and being formed on an entire outer circumferential face of each rotary valve, and a wide groove section, which is wider than the circular groove section, and the wide groove sections of the passage grooves are alternately formed, in the axial direction, in a mutually complementary manner.
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