Power transmission apparatus for clutchless compressor

1. A power transmission apparatus, comprising:

a pulley connected to a driving source for receiving a rotational force;

at least one damper installed on the pulley, said damper, as seen in a direction in which the pulley rotates, having a front surface and side surfaces; and

a cover plate including a hub connecting the pulley and a compressor, a fixed plate coupled to an upper surface of the hub, and at least one deformation member positioned on an outer circumferential surface of the fixed plate;

wherein the deformation member comprises a main deformation portion supporting the front surface of the damper and an auxiliary deformation portion supporting at least one of the side surfaces of the damper, and when an overload is applied to the compressor, the deformation member is deformed and a coupling relationship with the damper is released so that power transmission from the driving source is cut off; and

wherein the deformation member of the cover plate includes at least one main slit to define said main deformation portion in a front end of the deformation member and at least one auxiliary slit to define said auxiliary deformation portion in a side surface of the deformation member.

2. The power transmission apparatus as claimed in claim 1 , wherein the damper has first and second protrusions protruding, in the direction in which the pulley rotates, from both side edges of the damper and at least one auxiliary protrusion protruding in a direction perpendicular to the direction in which the pulley rotates.

3. The power transmission apparatus as claimed in claim 1 , wherein the damper comprises a support portion coupled to the pulley and an elastic portion enclosing an outer surface of the support portion.