Patent Number: 6,253,620

Title: Device and method for measuring dynamic torsional characteristics of a damper assembly

Abstract: An object is to enable accurate measurement of dynamic torsional characteristics of a damper assembly. A measuring device measures an angular speed (d.theta..sub.1 /dt) of an input rotary member, an angular speed (d.theta..sub.2 /dt) of an output rotary member and a torque (T.sub.1) transmitted to the input rotary member. A torsion angle (.theta.) of a damper unit is calculated by integrating the angular speeds (d.theta..sub.1 /dt) and (d.theta..sub.2 /dt) of the input and output rotary members. A torque (T) acting on the damper unit is calculated by subtracting a product of an angular acceleration (d.sup.2.theta..sub.1 /dt.sup.2) of the input rotary member calculated by differentiating the angular speed (d.theta..sub.1 /dt) of the input rotary member and a moment of inertia (I.sub.1) of the input rotary member from the torque (T.sub.1) transmitted to the input rotary member.

Inventors: Yamashita; Kazuhiro (Hirakata, JP)

Assignee: Exedy Corporation

International Classification: G01M 17/007 (20060101); G01M 17/04 (20060101); G01P 15/16 (20060101); G01D 009/00 ()

Expiration Date: 07/03/2018