Scroll compressor having recesses on the scroll wraps

A scroll compressor, comprising:

• a stationary scroll having a stationary end plate and a stationary scroll wrap;
• an orbital scroll having an orbital end plate and an orbital scroll wrap the orbital scroll wrap being swingably and rotatably meshed with the stationary scroll wrap to form a plurality of scroll-shaped compression spaces;
• a discharge port on a central portion of one of the stationary scroll and the orbital scroll;
• and
• a suction chamber outside an outer periphery of the stationary scroll wrap;
• the stationary scroll wrap being displaced at a starting position of the stationary scroll for defining one of said plurality of scroll-shaped compression spaces near the outer periphery of the stationary scroll wrap, the starting position being a position on the stationary scroll at which an outer periphery of the orbital scroll wrap would otherwise be in first contact with the stationary scroll wrap at a start of compression, wherein the stationary scroll wrap is displaced at the starting position of the stationary scroll by way of a recess formed on a surface of the stationary scroll wrap at the starting position of the stationary scroll wrap and the recess of the stationary scroll wrap has a linear surface.

A scroll compressor comprising:

• a stationary scroll having a stationary end plate and a stationary scroll wrap;
• an orbital scroll having an orbital end plate and an orbital scroll wrap, the orbital scroll wrap being swingably and rotatably meshed with the stationary scroll wrap to form a plurality of scroll-shaped compression spaces;
• a discharge port on a central portion of one of the stationary scroll and the orbital scroll;
• and
• a suction chamber outside an outer periphery of the stationary scroll wrap.;
• the stationary scroll wrap being displaced at a starting position of the stationary scroll for defining one of said plurality of scroll-shaped compression spaces near the outer periphery of the stationary scroll wrap, wherein the orbital scroll wrap has an inner peripheral side with a recess provided in the inner peripheral side near an end portion of the orbital scroll wrap on a side of the suction chamber, said scroll compressor further comprising a crank shaft which undergoes rotary motion, a bearing for supporting the crank shaft for the rotary motion, and a boss formed on the orbital scroll for transmitting the rotary motion of the crank shaft to the orbital scroll, wherein the recess of the orbital scroll wrap has a depth equal to a sum of a clearance between the crank shaft and the bearing and a clearance between the crank shaft and the boss.