Patent ID: 7455162

Claim:
A friction lining plate for a wet-running frictional shift element having at least one annular friction surface ( 4 ) That serves for frictional engagement and includes a first set of grooves ( 5 ) and a second set of grooves ( 6 ) both extending from an inner diameter (d_i) of the friction surface ( 4 ) Through which a coolant flows radially outward; the first set of grooves ( 5 ) and the second set of grooves ( 6 ) are superimposed on the friction surface ( 4 ) such that the friction lining plate ( 1 ) is rotatable in either rotational direction; each groove ( 5 ) of the first set of grooves ( 5 ) extends in a rearward direction along the friction surface ( 4 ) from the inner diameter (d_i) to an outer diameter (d_a) of the friction lining plate at a first angle which is oblique relative to a radial; each groove ( 6 ) of the second set of grooves ( 6 ) extends in a forward direction along the friction surface ( 4 ) from the inner diameter (d_i) to the outer diameter (d_a) of the frictional shift element at a second angle which is oblique relative to the radial; each groove ( 6 ) of the second set of grooves ( 6 ) intersects three different grooves of the first groove set ( 5 ) and forms a maximum of three groove intersection points ( 7 , 8 , 9 ); a first groove intersection point ( 8 , 9 ) is located adjacent the inner diameter (d_i) of the friction lining plate; a second groove intersection point ( 7 , 9 ) is located adjacent the outer diameter (d_a) of the friction lining plate; and a sum of circumferential lengths of all the grooves ( 5 , 6 ) of the first and the second sets of grooves ( 5 , 6 ), at the inner diameter (d_i), is less than a sum of circumferential lengths all the grooves ( 5 , 6 ) of the first and the second sets of grooves ( 5 , 6 ) at any individual radial distance between the inner diameter (d_i) and the outer diameter (d_a).