Disc brake or clutch

A spring applied coupling device comprising:

• a relatively rotatable input shaft rotatable about an axis of rotation:
• a radially outwardly extending rotor disc including inner and outer peripheral surfaces and means for mounting said disc for rotation with said input shaft;
• a first annular axially fixed reaction member adjacent one side of said rotor disc;
• a second annular axially fixed reaction member positioned on the opposite side of said rotor disc;
• a plurality of first connecting means for connecting said first and second axially fixed reaction members in fixed axially-spaced relationship, all of said plurality of connecting means extending axially and positioned radially outwardly from said outer peripheral surface of said rotor disc;
• a first annular axially movable reaction member positioned between said opposite side of said rotor disc and said second axially fixed reaction member;
• a second relatively movable annular reaction member;
• a plurality of second connecting means for connecting said first and second movable reaction members to each other a fixed axial distance apart, all of said plurality of connecting means extending axially and positioned radially outwardly from said outer peripheral surface of said rotor disc;
• an annular disc of friction material secured between each radially extending side of said rotor disc and said first fixed and said first movable reaction members;
• spring means between said first axially movable reaction member and said second relatively fixed reaction member for biasing said movable reaction member into frictional engagement with said disc;
• a second fixed reaction member and second movable reaction member forming an annular pressure chamber which when pressurized causes said movable members to move axially away from said rotor disc to compress said spring means and disengage said first annular annular axially movable reaction member from said disc.