| 摘要 |
PROBLEM TO BE SOLVED: To promote accumulation of air by providing a shape part configured to accumulate air between friction material segments, and thereby greatly reduce drag torque of a low rotational region.SOLUTION: In a friction plate 3 formed by annularly fixing a plurality of friction material segments 12 to an annular core plate 20, on a bottom surface 21a of an oil passage of the friction material segment 12, formed is a plurality of minute grooves 31 extending from the inner diameter side of the friction plate 3 to the outer diameter side thereof, and accumulating air bubbles. By promoting accumulation of air bubbles, drag torque of a low rotation region can be greatly reduced.SELECTED DRAWING: Figure 4 |
