Patent ID: 8308461

Claim:
A scroll compressor comprising: a pair of a fixed scroll member and a revolving scroll member, the pair being engaged with each other to form a compression chamber; a driven crank mechanism for driving the revolving scroll member to revolutionary turn around the fixed scroll member; and a pin-and-ring self rotation preventing mechanism for preventing self rotation of the revolving scroll member by setting a maximum displacement R in a direction of self rotation of the revolving scroll member, the maximum displacement R being determined in accordance with contact among plural pairs of a self rotation preventing pin and a self rotation preventing ring, plural pairs of the self rotation preventing pin and a self rotation preventing ring hole or plural pairs of self rotation preventing pin, the self rotation preventing ring and the self rotation preventing ring hole, that has a larger radius than a theoretical revolving radius of the revolving scroll member so as to include a revolving radius variable by means of the driven crank mechanism and by offsetting the self rotation preventing pin, the self rotation preventing ring or the self rotation preventing ring hole in a direction of reducing a twist of the revolving scroll member to the fixed scroll member in accordance with the maximum displacement R, wherein an orbit correction part is provided in the self rotation preventing ring hole of the revolving scroll member, and wherein the orbit correction part is formed into the shape of a ring hole formed by smoothly connecting the self rotation preventing ring hole having a small arc for reducing the maximum displacement R in a section of prevention of self rotation by means of the self rotation preventing pin and the self rotation preventing ring to the self rotation preventing ring hole having a large arc for increasing the maximum displacement R in a section of no prevention of self rotation by means of the self rotation preventing pin and the self rotation preventing ring.