US Patent 7455162 Friction lining plates

A friction lining plate for a wet-running frictional shift element that can rotate in the assembled condition with no preferred rotation direction, with at least one annular disk-like friction surface that serves for frictional engagement, having grooves through which coolant can flow. The grooves form two overlapping groove sets. Each groove of the first groove set extends at a first angle inclined obliquely to the radial direction and backward relative to a first rotation direction. Each groove of the second groove set extends at a second angle inclined obliquely to the radial direction and forward relative to a first rotation direction. Each groove of the second groove set intersects a groove of the first set in such manner that a groove intersection point is located at the inside diameter of the friction surface or a groove intersection point is located at the outside diameter of the friction surface.