at the bottom dead point inside the cylinder 19, the outer circumferential surface of the roller 18 is in slide contact with the top portion of the vane 22. At this time, the spring 25 is compressed thereby. As in the aforementioned state, the roller 18 rotates by about 24.degree. in counterclockwise direction, the pressure in the suction chamber 23 is lowered and at the same time the refrigerant is sucked through the injection opening 26. When the roller 18 is placed at the top dead point, the suction chamber 23 is filled with the refrigerant. When the roller 18 is positioned at the bottom dead point, the upper portion of the roller 18 is filled with the refrigerant in maximum. At this time, when the roller 18refrigerant chamber G1 and the second refrigerant chamber G2 because the outer circumferential surface of the cylinder 19 is not sealingly affixed to the inner circumferential surface of the body. The oil 60 flows to the vane groove 21 through the oil path 31. Meanwhile, as the roller 18 rotates eccentrically, the vane 22 moves vertically along the vane groove 21. When the eccentric crank shaft 17 is placed at the bottom dead point, the vane 22 is placed at the lowest portion and the oil 60 in the vane groove 21 is compressed and forcibly enters the oil supplying pipe 29. Meanwhile, the eccentric crank shaft 17 is placed at the top dead point, the vane is placed at the maximum upper portion and the oil 60