Clutch disc

In a clutch disc in which a clutch hub having a hub flange comes into rotating engagement with a disc plate through damping means and friction means, a clutch disc including:

• said hub flange comprising an inner flange portion and an outer flange portion mounted to be relatively rotatable by a given angle with respect to said inner flange portion and with an angular clearance;
• at least one plate fixed to said outer flange portion so as to limit the axial relative movement between said inner and outer flange portions;
• first damping means arranged operatively between said inner and outer flange portions through said fixed plate and designed to be resiliently compressed during relative angular displacement between said inner and outer flange portions;
• a first friction means disposed between said fixed plate and one of said inner and outer flange portions operatively associated with said inner and outer flange portions;
• at least one disc plate adapted to be relatively rotatable with respect to said outer flange portion and provided with a facing member on the disc plate outer periphery;
• second and third damping means arranged operatively between said disc plate and said outer flange portion, said second and third damping means being designed to be resiliently compressed during relative angular displacement between said disc plate and said outer flange portion;
• second and third friction means arranged between said fixed plate and said disc plate and acting between said outer flange portion and said disc plate;
• a control plate interposed between said fixed plate and said disc plate for determination of a point of commencement of action of said third friction means;
• and
• a resilient control means disposed to control the angular position of said control plate relative to said outer flange portion so as to maintain a predetermined angular position of said control plate relative to said outer flange portion during a predetermined relative rotation angle (.alpha.) between said outer and inner flange portions;
• said resilient control means being constructed and disposed so that it takes substantially no part in torque transmittance;
• and
• an outer periphery of said control plate being capable of engaging its said outer flange portion with a given angular clearance corresponding to said predetermined angle (.alpha.), and circumferentially engaging said resilient control means adapted to engage circumferentially within a window provided in said disc plate and to loosely and circumferentially fit in an associated window provided in said outer flange portion with an angular clearance corresponding to said predetermined angle (.alpha.).