OPTIMIZATION METHOD FOR GROOVE STRUCTURE OF FRICTION PLATE OF WET TYPE FRICTION ENGAGEMENT ELEMENT

摘要

PPROBLEM TO BE SOLVED: To provide a method of optimizing a groove structure of a friction plate of a wet type friction engagement element for reducing drag torque by increasing a discharge flow rate of lubrication oil from a friction surface and by increasing a content of air in the lubrication oil. PSOLUTION: The method of optimizing the groove structure of the friction plate of the wet type friction engagement element comprises, with respect to a groove 10 formed in a surface of the friction plate of the wet type friction engagement element and having a sector-shaped inner peripheral portion 12 expanding in an inner direction, calculating the discharge flow rate per groove area based on an inlet angle (circumference angle) of the inner peripheral portion 12 and a ration h/w of a length h of the inner peripheral portion to a length w of the entire groove 10 and setting the inlet angle (circumference angle) of the inner peripheral portion and a range of the ratio h/w of the inner peripheral portion length h to the entire groove length w wherein the discharge flow rate per groove area is equal to or more than a predetermined value. PCOPYRIGHT: (C)2005,JPO&NCIPI