Scroll compressor

A scroll compressor comprising a fixed scroll and an orbiting scroll, each including a spiral wrap protruding from an end plate and having a tooth thickness Tr and the same base-circle radius b defining an involute surface, the fixed scroll and the orbiting scroll being offset from each other by an orbiting radius ρ and meshing such that the respective wraps face each other with a phase shift of 180°, wherein the orbiting scroll revolves/orbits along a circular orbit with the orbiting radius ρ to compress a gas while a rotation-preventing mechanism prevents rotation of the orbiting scroll;

• wherein a relationship between the involute surfaces of the spiral wraps of the two scrolls and the dimensions, dimensional tolerance, and assembly standards of the rotation-preventing mechanism are determined so that a median value of an allowable angle of rotation φ agrees with an upright position of the orbiting scroll;
• wherein the median value of the allowable angle of rotation φ is shifted from the upright position of the orbiting scroll in a direction (left) opposite an orbiting direction.