Wet friction plate

摘要

Provided is a wet friction plate which can realize a further reduction of drag torque while suppressing a decrease in the total area of frictional sheets. A clutch friction plate 200 is formed by providing frictional sheets 210 and oil grooves 220 on a flat annular metal core 201. On a side surface of the metal core 201 facing a clutch plate 103, a plurality of small frictional sheets 210 and oil grooves 220 are alternatingly arranged along the circumferential direction of the metal core 201. The frictional sheets 210 are disposed to form frictional-sheet groups 211 each including five frictional sheets 210 disposed successively. Outer and inner peripheral edges 213 and 214 of the frictional sheets 210 of each frictional-sheet group 211 form continuously changing arcuate contours 213a and 214a such that the distances L213 and L214 between the outer and inner peripheral edges 213 and 214 and the center of rotation O of the metal core 201 continuously change.

主权项

1. A wet friction plate comprising:
a flat annular metal core having a center of rotation; and a plurality of friction sheet groups which are disposed on a surface of the metal core and extend in a circumferential direction of the metal core, each friction sheet group comprising three frictional sheets consecutively arranged in the circumferential direction of the metal core and each separated from an adjacent frictional sheet by a gap forming an oil groove, each friction sheet group having on at least one of its inner periphery and its outer periphery a continuously changing contour which extends over all the frictional sheets in the friction sheet group and which coincides with a single continuous curve which is concave towards the center of rotation of the metal core over the length of the curve, the distance from the curve to the center of rotation of the core continuously changing over the length of the curve.