Oldham coupling for a scroll compressor

A scroll compressor including:

• a compression unit including a non-orbiting scroll having a non-orbiting base plate and a non-orbiting spiral wrap, and an orbiting scroll having an orbiting base plate and an orbiting spiral wrap, the non-orbiting spiral wrap and the orbiting spiral wrap forming a plurality of compression chambers,
• a drive shaft including a driving portion configured to drive the orbiting scroll in an orbital movement;
• and
• an Oldham coupling including:
• an annular ring having a first side and a second side opposite to the first side;
• a first and a second engaging groove configured to be slidably engaged with a first and a second complementary engaging projection provided on a non-orbiting element, the first and second engaging grooves being diametrically opposed to each other and provided on the first side of the annular ring;
• a third and a fourth engaging groove configured to be slidably engaged with a third and a fourth complementary engaging projection provided on the orbiting base plate, the third and fourth engaging grooves being diametrically opposed to each other and provided on the second side of the annular ring;
• wherein the first and third engaging grooves are located in a first angular sector of the annular ring, and the second and fourth engaging grooves are located in a second angular sector of the annular ring, diametrically opposed to the first angular sector, the first and second angular sectors each having an opening angle less than 40°;
• and
• wherein a depth of the first engaging groove is less than a depth of the third engaging groove, and a depth of the second engaging groove is less than a depth of the fourth engaging groove.