Damper mechanism

A damper mechanism comprising:

• an input rotary member;
• an output rotary member being disposed to rotate relative to said input rotary member;
• a damper mechanism having
• a spring member being configured to couple rotationally said input rotary member and said output rotary member, and
• a torsion characteristic having
• a positive side corresponding to said input rotary member being twisted in a rotational drive direction with respect to said output rotary member,
• a negative side corresponding to said input rotary member being twisted in a direction opposite said rotational drive direction with respect to said output rotary member,
• a first stage, and
• a second stage corresponding to said spring member being compressed, said second stage having a higher rigidity than said first stage, said second stage existing on both said positive side and said negative side;
• a friction mechanism being configured to generate friction when said input rotary member and said output rotary member rotate relative to each other within said second stage and said spring member exerts an elastic force;
• and
• a friction suppressing mechanism being configured to secure a rotational gap only in said second stage on said positive side or said second stage on said negative side of said torsion characteristic, said friction suppressing mechanism being configured to prevent said elastic force of said spring member from acting on said friction mechanism within a prescribed angular range.

A clutch disk assembly being configured to transfer torque from an engine and dampen vibrations from a flywheel, the clutch disk assembly comprising:

• an input rotary member;
• an output rotary member being disposed to rotate relative to said input rotary member;
• a hub flange being disposed between said input rotary member and said output rotary member;
• a first elastic member being configured to couple elastically said output rotary member and said hub flange in a rotational direction, said first elastic member being configured to compress in a first stage of relative rotation between said output rotary member and said input rotary member;
• a second elastic member being configured to couple elastically said input rotary member and said hub flange in said rotational direction, said second elastic member being configured to compress in series with said first elastic member, said second elastic member having a higher rigidity than said first elastic member, said second elastic member being configured to compress in a second stage of relative rotation between said output rotary member and said input rotary member;
• a friction mechanism being configured to generate friction when said input rotary member and said output rotary member rotate relative to each other within said second stage and said second elastic member exerts an elastic force;
• and
• a friction suppressing mechanism being configured to secure a rotational gap only in said second stage on a positive side or said second stage on a negative side of relative rotation between said input rotary member and said output rotary member, said friction suppressing mechanism being configured to prevent elastic force of said second member from acting on a friction mechanism within a prescribed angular range.