Rotary compressor

A rotary compressor comprising:

• a cylindrical compressor housing which is provided with an inlet unit of a refrigerant and a discharging unit of the refrigerant;
• a compressing unit which is disposed inside the compressor housing and which includes a cylinder and a piston for compressing the refrigerant that is sucked in from an inlet portion;
• a rotation shaft which is provided with the piston of the compressing unit;
• a bearing unit which is fixed to an inner portion of the compressor housing and which supports one end side of the rotation shaft to rotate freely;
• and
• a motor which includes a cylindrical stator and a rotor that is provided on another end side of the rotation shaft and that rotates inside the stator, and which drives the compressing unit via the rotation shaft, wherein
• the stator includes metal plates stacked in an axial direction of the rotation shaft,
• the metal plates each have a portion deformed in a thickness direction of each metal plate as a caulked joint portion, and a concave portion at a periphery of each metal plate, a position of the concave portion corresponding to the caulked joint portion,
• adjacent metal plates of the metal plates are joined together by using caulked joint portions of the adjacent metal plates to stack the adjacent metal plate in the axial direction in order to form the stator,
• an outer circumferential portion of the stator includes an elongated concave portion and an oil groove for lubricant oil to flow in the axial direction, and is fixed to an inner circumferential portion of the compressor housing in a transition fit state, the elongated concave portion comprising the concave portion of each metal plate,
• a weld portion joins the elongated concave portion and the inner circumferential portion of the compressor housing together, and
• a depth of the elongated concave portion is smaller than a thickness of the caulked joint portion in a radial direction of the stator.