Patent ID: 7828663

Claim:
A torque fluctuation absorbing apparatus including a limiter mechanism arranged between a driving-side member and a driven-side member, the limiter mechanism being configured to transmit a relative torque generated between the driving-side member and the driven-side member and to discontinue a transmission of the relative torque greater than a predetermined value, the limiter mechanism comprising: a disc member connected to one of the driving-side member and the driven-side member a first plate and a second plate connected to the other one of the driving-side member and the driven-side member; a frictional member fixed to the disc member and interposed between the first plate and the second plate, the frictional member including a frictional surface slidably in contact with the first and second plates; the frictional member including a fibrous substrate and formed with a plurality of grooves at the frictional surface, a smallest dimension between two adjacent grooves from among the plurality of grooves being greater than or equal to 2 mm and smaller than or equal to 7 mm; and wherein the frictional surface includes a first frictional surface at which the fibrous substrate is exposed and a second frictional surface at which the fibrous substrate is not exposed, and an area of the first frictional surface is less than or equal to 50 percent of an entire area of the frictional surface including the second frictional surface.