| 摘要 |
Plate (1) comprises at least one friction surface (4) having grooves (7.1, 7.2, 10.1, 10.2) and an inner peripheral edge (6) and an outer peripheral edge (5). At least one groove runs from the inner peripheral edge toward the outer peripheral edge. The groove has at least one deviating point (8.1, 8.2, 9.1, 9.2, 11.1, 11.2, 12.1, 12.2) where the groove bends at an angle (alpha1-alpha4). Preferred Features: The angle is 75-115degrees. The groove has at least two successive deviating points where the groove bends at opposite angles.
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