Clutch brake assembly

A clutch brake assembly comprising:

• an annular operating element externally operable for rotational movement through a predetermined circumferential angle;
• a cylindrical input hub arranged concentrically of said operating element and rigidly fitted on an output shaft of a rotary machine as a driver;
• an output hub having an axially extending boss portion and arranged concentrically of said output shaft for rotation relative to said output shaft;
• an annular friction plate splinefitted on said boss portion of said output hub for rotational movement together with said output hub and for axial displacement relative to said output hub for frictional engagement with said input hub;
• urging means resiliently urging said friction plate toward said input hub;
• an annular brake element interposed between said operating element and said friction plate for axial displacement into frictional engagement with said friction plate;
• mounting means for said brake element for permitting axial displacement of said brake element and prohibiting circumferential displacement of said brake element,
• said mounting means including a plurality of bolts held stationary and arranged at circumferentially spaced locations of said brake element and disposed axially of the clutch brake assembly;
• and a plurality of sleeves each fitted on an associated one of said bolts, said brake element being fitted on said sleeves for axial displacement along said sleeves;
• and
• a plurality of balls rollingly held between said operating element and said brake element;
• said operating element including a plurality of first grooves formed in a side surface thereof facing said brake element at circumferentially spaced locations, said brake element including a plurality of second grooves formed in a side surface thereof facing said operating element at circumferentially spaced locations, said first and second grooves extending circumferentiahly, respectively, of said operating element and said brake element, at least one of said first and second grooves each having a depth gradually decreasing from one end thereof toward the other end thereof, said balls each being engaged in mutually facing ones of said first and second grooves, whereby axial displacement of said brake element in a direction toward said operating element causes frictional engagement of said input hub with said friction plate to thereby permit transmission of torque from said input hub to said output hub, and axial displacement of said brake element in a direction away from said operating element causes disengagement of said friction plate from said input hub to thereby interrupt said torque transmission and simultaneously caused frictional engagement of said brake element with said friction plate to thereby cause braking of said output hub;
• said annular brake element comprising a cylindrical member having two ends, said cylindrical member having a first flange radially outwardly extending from an end thereof and a second flange radially inwardly extending from the other end thereof, said first flange being disposed for frictional engagement with said friction plate and said second flange being disposed in facing relation to said operating element via said balls interposed therebetween.