Scroll compressor

A scroll compressor comprising:

• a casing;
• a main frame fixed to an inside of the casing;
• a rotating shaft inserted through the main frame and supported by the main frame, the rotating shaft including an eccentric portion;
• an orbiting scroll including:
• an orbiting end plate coupled to the eccentric portion of the rotating shaft, and
• an orbiting wrap extending from a first side surface of the orbiting end plate;
• and
• a fixed scroll including:
• a fixed end plate defining a discharge port, and
• a fixed wrap extending from the fixed end plate toward the orbiting end plate and defines a compression chamber together with the orbiting wrap,
• wherein the orbiting scroll includes a rotating shaft coupling portion axially extending from a central portion of the orbiting end plate and radially overlapping the orbiting wrap, the rotating shaft coupling portion coupling to the eccentric portion of the rotating shaft,
• wherein a portion of the orbiting wrap extends from an end surface of the rotating shaft coupling portion that faces the fixed end plate,
• wherein an inner circumferential surface of the rotating shaft coupling portion axially overlaps a discharge end of the orbiting wrap when projected in an axial direction,
• wherein the orbiting end plate includes an orbiting step surface extending between (i) an outer surface of the orbiting wrap and (ii) an inner surface of the orbiting wrap, the inner surface facing the outer surface of the orbiting wrap,
• wherein the fixed wrap includes a fixed step surface that corresponds to the orbiting step surface,
• wherein the orbiting step surface and the fixed step surface are spaced apart from each other at a discharge starting angle of the compression chamber, and
• wherein, based on the orbiting step surface and the fixed step surface being spaced apart from each other, one end of the orbiting step surface is in fluid communication with or axially overlapped with a portion of the discharge port to thereby communicate with the portion of the discharge port at the discharge starting angle.