Clearance adjusting member

A clearance adjusting member, in a pin coupling structure in which a first member and a second member are coupled freely to be rotated in relation to each other by a cylindrical pin, for adjusting an axial clearance between the first member and the second member, the clearance adjusting member comprising:

• a U-shaped or C-shaped shim attached to the pin in the axial clearance, and a restricting means for restricting the shim so as to be freely releasable;
• wherein a restricted piece protruding radially outward is formed on an outer circumferential edge of the shim,
• wherein the restricting means includes a pair of restricting pieces spacedly arranged circumferentially on an outer circumferential edge of the restricting means,
• wherein one-side slanting piece extending by slanting to the direction of an axial one-side towards a circumferential one-side is provided at a circumferential one-side end portion of one of the pair of restricting pieces, and an another-side slanting piece extending by slanting to the direction of an axial one-side towards a circumferential another-side is provided at the circumferential another-side end portion of one of the pair of restricting pieces, and
• wherein, when the shim is inserted towards the axial clearance, the restricted piece pushes and rides over while elastically deforming the one-side slanting piece towards the circumferential one-side, or the restricted piece pushes and rides over while elastically deforming the another-side slanting piece towards the circumferential another-side, and thereby the restricted piece is positioned between the pair of restricting pieces, and the shim is attached to the pin.